1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * linux/lib/vsprintf.c 2 * linux/lib/vsprintf.c
4 * 3 *
5 * Copyright (C) 1991, 1992 Linus Torvalds 4 * Copyright (C) 1991, 1992 Linus Torvalds
6 */ 5 */
7 6
8 /* vsprintf.c -- Lars Wirzenius & Linus Torval 7 /* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
9 /* 8 /*
10 * Wirzenius wrote this portably, Torvalds fuc 9 * Wirzenius wrote this portably, Torvalds fucked it up :-)
11 */ 10 */
12 11
13 /* 12 /*
14 * Fri Jul 13 2001 Crutcher Dunnavant <crutche 13 * Fri Jul 13 2001 Crutcher Dunnavant <crutcher+kernel@datastacks.com>
15 * - changed to provide snprintf and vsnprintf 14 * - changed to provide snprintf and vsnprintf functions
16 * So Feb 1 16:51:32 CET 2004 Juergen Quade < 15 * So Feb 1 16:51:32 CET 2004 Juergen Quade <quade@hsnr.de>
17 * - scnprintf and vscnprintf 16 * - scnprintf and vscnprintf
18 */ 17 */
19 18
20 #include <linux/stdarg.h> !! 19 #include <stdarg.h>
21 #include <linux/build_bug.h> <<
22 #include <linux/clk.h> 20 #include <linux/clk.h>
23 #include <linux/clk-provider.h> 21 #include <linux/clk-provider.h>
24 #include <linux/errname.h> <<
25 #include <linux/module.h> /* for KSYM_SY 22 #include <linux/module.h> /* for KSYM_SYMBOL_LEN */
26 #include <linux/types.h> 23 #include <linux/types.h>
27 #include <linux/string.h> 24 #include <linux/string.h>
28 #include <linux/ctype.h> 25 #include <linux/ctype.h>
29 #include <linux/kernel.h> 26 #include <linux/kernel.h>
30 #include <linux/kallsyms.h> 27 #include <linux/kallsyms.h>
31 #include <linux/math64.h> 28 #include <linux/math64.h>
32 #include <linux/uaccess.h> 29 #include <linux/uaccess.h>
33 #include <linux/ioport.h> 30 #include <linux/ioport.h>
34 #include <linux/dcache.h> 31 #include <linux/dcache.h>
35 #include <linux/cred.h> 32 #include <linux/cred.h>
36 #include <linux/rtc.h> 33 #include <linux/rtc.h>
37 #include <linux/sprintf.h> <<
38 #include <linux/time.h> <<
39 #include <linux/uuid.h> 34 #include <linux/uuid.h>
40 #include <linux/of.h> 35 #include <linux/of.h>
41 #include <net/addrconf.h> 36 #include <net/addrconf.h>
42 #include <linux/siphash.h> 37 #include <linux/siphash.h>
43 #include <linux/compiler.h> 38 #include <linux/compiler.h>
44 #include <linux/property.h> <<
45 #include <linux/notifier.h> <<
46 #ifdef CONFIG_BLOCK 39 #ifdef CONFIG_BLOCK
47 #include <linux/blkdev.h> 40 #include <linux/blkdev.h>
48 #endif 41 #endif
49 42
50 #include "../mm/internal.h" /* For the tra 43 #include "../mm/internal.h" /* For the trace_print_flags arrays */
51 44
52 #include <asm/page.h> /* for PAGE_SI 45 #include <asm/page.h> /* for PAGE_SIZE */
53 #include <asm/byteorder.h> /* cpu_to_le16 46 #include <asm/byteorder.h> /* cpu_to_le16 */
54 #include <asm/unaligned.h> <<
55 47
56 #include <linux/string_helpers.h> 48 #include <linux/string_helpers.h>
57 #include "kstrtox.h" 49 #include "kstrtox.h"
58 50
59 /* Disable pointer hashing if requested */ <<
60 bool no_hash_pointers __ro_after_init; <<
61 EXPORT_SYMBOL_GPL(no_hash_pointers); <<
62 <<
63 noinline <<
64 static unsigned long long simple_strntoull(con <<
65 { <<
66 const char *cp; <<
67 unsigned long long result = 0ULL; <<
68 size_t prefix_chars; <<
69 unsigned int rv; <<
70 <<
71 cp = _parse_integer_fixup_radix(startp <<
72 prefix_chars = cp - startp; <<
73 if (prefix_chars < max_chars) { <<
74 rv = _parse_integer_limit(cp, <<
75 /* FIXME */ <<
76 cp += (rv & ~KSTRTOX_OVERFLOW) <<
77 } else { <<
78 /* Field too short for prefix <<
79 cp = startp + max_chars; <<
80 } <<
81 <<
82 if (endp) <<
83 *endp = (char *)cp; <<
84 <<
85 return result; <<
86 } <<
87 <<
88 /** 51 /**
89 * simple_strtoull - convert a string to an un 52 * simple_strtoull - convert a string to an unsigned long long
90 * @cp: The start of the string 53 * @cp: The start of the string
91 * @endp: A pointer to the end of the parsed s 54 * @endp: A pointer to the end of the parsed string will be placed here
92 * @base: The number base to use 55 * @base: The number base to use
93 * 56 *
94 * This function has caveats. Please use kstrt !! 57 * This function is obsolete. Please use kstrtoull instead.
95 */ 58 */
96 noinline <<
97 unsigned long long simple_strtoull(const char 59 unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base)
98 { 60 {
99 return simple_strntoull(cp, endp, base !! 61 unsigned long long result;
>> 62 unsigned int rv;
>> 63
>> 64 cp = _parse_integer_fixup_radix(cp, &base);
>> 65 rv = _parse_integer(cp, base, &result);
>> 66 /* FIXME */
>> 67 cp += (rv & ~KSTRTOX_OVERFLOW);
>> 68
>> 69 if (endp)
>> 70 *endp = (char *)cp;
>> 71
>> 72 return result;
100 } 73 }
101 EXPORT_SYMBOL(simple_strtoull); 74 EXPORT_SYMBOL(simple_strtoull);
102 75
103 /** 76 /**
104 * simple_strtoul - convert a string to an uns 77 * simple_strtoul - convert a string to an unsigned long
105 * @cp: The start of the string 78 * @cp: The start of the string
106 * @endp: A pointer to the end of the parsed s 79 * @endp: A pointer to the end of the parsed string will be placed here
107 * @base: The number base to use 80 * @base: The number base to use
108 * 81 *
109 * This function has caveats. Please use kstrt !! 82 * This function is obsolete. Please use kstrtoul instead.
110 */ 83 */
111 unsigned long simple_strtoul(const char *cp, c 84 unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
112 { 85 {
113 return simple_strtoull(cp, endp, base) 86 return simple_strtoull(cp, endp, base);
114 } 87 }
115 EXPORT_SYMBOL(simple_strtoul); 88 EXPORT_SYMBOL(simple_strtoul);
116 89
117 /** 90 /**
118 * simple_strtol - convert a string to a signe 91 * simple_strtol - convert a string to a signed long
119 * @cp: The start of the string 92 * @cp: The start of the string
120 * @endp: A pointer to the end of the parsed s 93 * @endp: A pointer to the end of the parsed string will be placed here
121 * @base: The number base to use 94 * @base: The number base to use
122 * 95 *
123 * This function has caveats. Please use kstrt !! 96 * This function is obsolete. Please use kstrtol instead.
124 */ 97 */
125 long simple_strtol(const char *cp, char **endp 98 long simple_strtol(const char *cp, char **endp, unsigned int base)
126 { 99 {
127 if (*cp == '-') 100 if (*cp == '-')
128 return -simple_strtoul(cp + 1, 101 return -simple_strtoul(cp + 1, endp, base);
129 102
130 return simple_strtoul(cp, endp, base); 103 return simple_strtoul(cp, endp, base);
131 } 104 }
132 EXPORT_SYMBOL(simple_strtol); 105 EXPORT_SYMBOL(simple_strtol);
133 106
134 noinline <<
135 static long long simple_strntoll(const char *c <<
136 { <<
137 /* <<
138 * simple_strntoull() safely handles r <<
139 * case cp[0] == '-' && max_chars == 1 <<
140 * If max_chars == 0 we can drop throu <<
141 * and the content of *cp is irrelevan <<
142 */ <<
143 if (*cp == '-' && max_chars > 0) <<
144 return -simple_strntoull(cp + <<
145 <<
146 return simple_strntoull(cp, endp, base <<
147 } <<
148 <<
149 /** 107 /**
150 * simple_strtoll - convert a string to a sign 108 * simple_strtoll - convert a string to a signed long long
151 * @cp: The start of the string 109 * @cp: The start of the string
152 * @endp: A pointer to the end of the parsed s 110 * @endp: A pointer to the end of the parsed string will be placed here
153 * @base: The number base to use 111 * @base: The number base to use
154 * 112 *
155 * This function has caveats. Please use kstrt !! 113 * This function is obsolete. Please use kstrtoll instead.
156 */ 114 */
157 long long simple_strtoll(const char *cp, char 115 long long simple_strtoll(const char *cp, char **endp, unsigned int base)
158 { 116 {
159 return simple_strntoll(cp, endp, base, !! 117 if (*cp == '-')
>> 118 return -simple_strtoull(cp + 1, endp, base);
>> 119
>> 120 return simple_strtoull(cp, endp, base);
160 } 121 }
161 EXPORT_SYMBOL(simple_strtoll); 122 EXPORT_SYMBOL(simple_strtoll);
162 123
163 static noinline_for_stack 124 static noinline_for_stack
164 int skip_atoi(const char **s) 125 int skip_atoi(const char **s)
165 { 126 {
166 int i = 0; 127 int i = 0;
167 128
168 do { 129 do {
169 i = i*10 + *((*s)++) - ''; 130 i = i*10 + *((*s)++) - '';
170 } while (isdigit(**s)); 131 } while (isdigit(**s));
171 132
172 return i; 133 return i;
173 } 134 }
174 135
175 /* 136 /*
176 * Decimal conversion is by far the most typic 137 * Decimal conversion is by far the most typical, and is used for
177 * /proc and /sys data. This directly impacts 138 * /proc and /sys data. This directly impacts e.g. top performance
178 * with many processes running. We optimize it 139 * with many processes running. We optimize it for speed by emitting
179 * two characters at a time, using a 200 byte 140 * two characters at a time, using a 200 byte lookup table. This
180 * roughly halves the number of multiplication 141 * roughly halves the number of multiplications compared to computing
181 * the digits one at a time. Implementation st 142 * the digits one at a time. Implementation strongly inspired by the
182 * previous version, which in turn used ideas 143 * previous version, which in turn used ideas described at
183 * <http://www.cs.uiowa.edu/~jones/bcd/divide. 144 * <http://www.cs.uiowa.edu/~jones/bcd/divide.html> (with permission
184 * from the author, Douglas W. Jones). 145 * from the author, Douglas W. Jones).
185 * 146 *
186 * It turns out there is precisely one 26 bit 147 * It turns out there is precisely one 26 bit fixed-point
187 * approximation a of 64/100 for which x/100 = 148 * approximation a of 64/100 for which x/100 == (x * (u64)a) >> 32
188 * holds for all x in [0, 10^8-1], namely a = 149 * holds for all x in [0, 10^8-1], namely a = 0x28f5c29. The actual
189 * range happens to be somewhat larger (x <= 1 150 * range happens to be somewhat larger (x <= 1073741898), but that's
190 * irrelevant for our purpose. 151 * irrelevant for our purpose.
191 * 152 *
192 * For dividing a number in the range [10^4, 1 153 * For dividing a number in the range [10^4, 10^6-1] by 100, we still
193 * need a 32x32->64 bit multiply, so we simply 154 * need a 32x32->64 bit multiply, so we simply use the same constant.
194 * 155 *
195 * For dividing a number in the range [100, 10 156 * For dividing a number in the range [100, 10^4-1] by 100, there are
196 * several options. The simplest is (x * 0x147 157 * several options. The simplest is (x * 0x147b) >> 19, which is valid
197 * for all x <= 43698. 158 * for all x <= 43698.
198 */ 159 */
199 160
200 static const u16 decpair[100] = { 161 static const u16 decpair[100] = {
201 #define _(x) (__force u16) cpu_to_le16(((x % 1 162 #define _(x) (__force u16) cpu_to_le16(((x % 10) | ((x / 10) << 8)) + 0x3030)
202 _( 0), _( 1), _( 2), _( 3), _( 4), _( 163 _( 0), _( 1), _( 2), _( 3), _( 4), _( 5), _( 6), _( 7), _( 8), _( 9),
203 _(10), _(11), _(12), _(13), _(14), _(1 164 _(10), _(11), _(12), _(13), _(14), _(15), _(16), _(17), _(18), _(19),
204 _(20), _(21), _(22), _(23), _(24), _(2 165 _(20), _(21), _(22), _(23), _(24), _(25), _(26), _(27), _(28), _(29),
205 _(30), _(31), _(32), _(33), _(34), _(3 166 _(30), _(31), _(32), _(33), _(34), _(35), _(36), _(37), _(38), _(39),
206 _(40), _(41), _(42), _(43), _(44), _(4 167 _(40), _(41), _(42), _(43), _(44), _(45), _(46), _(47), _(48), _(49),
207 _(50), _(51), _(52), _(53), _(54), _(5 168 _(50), _(51), _(52), _(53), _(54), _(55), _(56), _(57), _(58), _(59),
208 _(60), _(61), _(62), _(63), _(64), _(6 169 _(60), _(61), _(62), _(63), _(64), _(65), _(66), _(67), _(68), _(69),
209 _(70), _(71), _(72), _(73), _(74), _(7 170 _(70), _(71), _(72), _(73), _(74), _(75), _(76), _(77), _(78), _(79),
210 _(80), _(81), _(82), _(83), _(84), _(8 171 _(80), _(81), _(82), _(83), _(84), _(85), _(86), _(87), _(88), _(89),
211 _(90), _(91), _(92), _(93), _(94), _(9 172 _(90), _(91), _(92), _(93), _(94), _(95), _(96), _(97), _(98), _(99),
212 #undef _ 173 #undef _
213 }; 174 };
214 175
215 /* 176 /*
216 * This will print a single '' even if r == 0, 177 * This will print a single '' even if r == 0, since we would
217 * immediately jump to out_r where two 0s woul 178 * immediately jump to out_r where two 0s would be written but only
218 * one of them accounted for in buf. This is n 179 * one of them accounted for in buf. This is needed by ip4_string
219 * below. All other callers pass a non-zero va 180 * below. All other callers pass a non-zero value of r.
220 */ 181 */
221 static noinline_for_stack 182 static noinline_for_stack
222 char *put_dec_trunc8(char *buf, unsigned r) 183 char *put_dec_trunc8(char *buf, unsigned r)
223 { 184 {
224 unsigned q; 185 unsigned q;
225 186
226 /* 1 <= r < 10^8 */ 187 /* 1 <= r < 10^8 */
227 if (r < 100) 188 if (r < 100)
228 goto out_r; 189 goto out_r;
229 190
230 /* 100 <= r < 10^8 */ 191 /* 100 <= r < 10^8 */
231 q = (r * (u64)0x28f5c29) >> 32; 192 q = (r * (u64)0x28f5c29) >> 32;
232 *((u16 *)buf) = decpair[r - 100*q]; 193 *((u16 *)buf) = decpair[r - 100*q];
233 buf += 2; 194 buf += 2;
234 195
235 /* 1 <= q < 10^6 */ 196 /* 1 <= q < 10^6 */
236 if (q < 100) 197 if (q < 100)
237 goto out_q; 198 goto out_q;
238 199
239 /* 100 <= q < 10^6 */ 200 /* 100 <= q < 10^6 */
240 r = (q * (u64)0x28f5c29) >> 32; 201 r = (q * (u64)0x28f5c29) >> 32;
241 *((u16 *)buf) = decpair[q - 100*r]; 202 *((u16 *)buf) = decpair[q - 100*r];
242 buf += 2; 203 buf += 2;
243 204
244 /* 1 <= r < 10^4 */ 205 /* 1 <= r < 10^4 */
245 if (r < 100) 206 if (r < 100)
246 goto out_r; 207 goto out_r;
247 208
248 /* 100 <= r < 10^4 */ 209 /* 100 <= r < 10^4 */
249 q = (r * 0x147b) >> 19; 210 q = (r * 0x147b) >> 19;
250 *((u16 *)buf) = decpair[r - 100*q]; 211 *((u16 *)buf) = decpair[r - 100*q];
251 buf += 2; 212 buf += 2;
252 out_q: 213 out_q:
253 /* 1 <= q < 100 */ 214 /* 1 <= q < 100 */
254 r = q; 215 r = q;
255 out_r: 216 out_r:
256 /* 1 <= r < 100 */ 217 /* 1 <= r < 100 */
257 *((u16 *)buf) = decpair[r]; 218 *((u16 *)buf) = decpair[r];
258 buf += r < 10 ? 1 : 2; 219 buf += r < 10 ? 1 : 2;
259 return buf; 220 return buf;
260 } 221 }
261 222
262 #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG 223 #if BITS_PER_LONG == 64 && BITS_PER_LONG_LONG == 64
263 static noinline_for_stack 224 static noinline_for_stack
264 char *put_dec_full8(char *buf, unsigned r) 225 char *put_dec_full8(char *buf, unsigned r)
265 { 226 {
266 unsigned q; 227 unsigned q;
267 228
268 /* 0 <= r < 10^8 */ 229 /* 0 <= r < 10^8 */
269 q = (r * (u64)0x28f5c29) >> 32; 230 q = (r * (u64)0x28f5c29) >> 32;
270 *((u16 *)buf) = decpair[r - 100*q]; 231 *((u16 *)buf) = decpair[r - 100*q];
271 buf += 2; 232 buf += 2;
272 233
273 /* 0 <= q < 10^6 */ 234 /* 0 <= q < 10^6 */
274 r = (q * (u64)0x28f5c29) >> 32; 235 r = (q * (u64)0x28f5c29) >> 32;
275 *((u16 *)buf) = decpair[q - 100*r]; 236 *((u16 *)buf) = decpair[q - 100*r];
276 buf += 2; 237 buf += 2;
277 238
278 /* 0 <= r < 10^4 */ 239 /* 0 <= r < 10^4 */
279 q = (r * 0x147b) >> 19; 240 q = (r * 0x147b) >> 19;
280 *((u16 *)buf) = decpair[r - 100*q]; 241 *((u16 *)buf) = decpair[r - 100*q];
281 buf += 2; 242 buf += 2;
282 243
283 /* 0 <= q < 100 */ 244 /* 0 <= q < 100 */
284 *((u16 *)buf) = decpair[q]; 245 *((u16 *)buf) = decpair[q];
285 buf += 2; 246 buf += 2;
286 return buf; 247 return buf;
287 } 248 }
288 249
289 static noinline_for_stack 250 static noinline_for_stack
290 char *put_dec(char *buf, unsigned long long n) 251 char *put_dec(char *buf, unsigned long long n)
291 { 252 {
292 if (n >= 100*1000*1000) 253 if (n >= 100*1000*1000)
293 buf = put_dec_full8(buf, do_di 254 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
294 /* 1 <= n <= 1.6e11 */ 255 /* 1 <= n <= 1.6e11 */
295 if (n >= 100*1000*1000) 256 if (n >= 100*1000*1000)
296 buf = put_dec_full8(buf, do_di 257 buf = put_dec_full8(buf, do_div(n, 100*1000*1000));
297 /* 1 <= n < 1e8 */ 258 /* 1 <= n < 1e8 */
298 return put_dec_trunc8(buf, n); 259 return put_dec_trunc8(buf, n);
299 } 260 }
300 261
301 #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LON 262 #elif BITS_PER_LONG == 32 && BITS_PER_LONG_LONG == 64
302 263
303 static void 264 static void
304 put_dec_full4(char *buf, unsigned r) 265 put_dec_full4(char *buf, unsigned r)
305 { 266 {
306 unsigned q; 267 unsigned q;
307 268
308 /* 0 <= r < 10^4 */ 269 /* 0 <= r < 10^4 */
309 q = (r * 0x147b) >> 19; 270 q = (r * 0x147b) >> 19;
310 *((u16 *)buf) = decpair[r - 100*q]; 271 *((u16 *)buf) = decpair[r - 100*q];
311 buf += 2; 272 buf += 2;
312 /* 0 <= q < 100 */ 273 /* 0 <= q < 100 */
313 *((u16 *)buf) = decpair[q]; 274 *((u16 *)buf) = decpair[q];
314 } 275 }
315 276
316 /* 277 /*
317 * Call put_dec_full4 on x % 10000, return x / 278 * Call put_dec_full4 on x % 10000, return x / 10000.
318 * The approximation x/10000 == (x * 0x346DC5D 279 * The approximation x/10000 == (x * 0x346DC5D7) >> 43
319 * holds for all x < 1,128,869,999. The large 280 * holds for all x < 1,128,869,999. The largest value this
320 * helper will ever be asked to convert is 1,1 281 * helper will ever be asked to convert is 1,125,520,955.
321 * (second call in the put_dec code, assuming 282 * (second call in the put_dec code, assuming n is all-ones).
322 */ 283 */
323 static noinline_for_stack 284 static noinline_for_stack
324 unsigned put_dec_helper4(char *buf, unsigned x 285 unsigned put_dec_helper4(char *buf, unsigned x)
325 { 286 {
326 uint32_t q = (x * (uint64_t)0x346DC5D7 287 uint32_t q = (x * (uint64_t)0x346DC5D7) >> 43;
327 288
328 put_dec_full4(buf, x - q * 10000); 289 put_dec_full4(buf, x - q * 10000);
329 return q; 290 return q;
330 } 291 }
331 292
332 /* Based on code by Douglas W. Jones found at 293 /* Based on code by Douglas W. Jones found at
333 * <http://www.cs.uiowa.edu/~jones/bcd/decimal 294 * <http://www.cs.uiowa.edu/~jones/bcd/decimal.html#sixtyfour>
334 * (with permission from the author). 295 * (with permission from the author).
335 * Performs no 64-bit division and hence shoul 296 * Performs no 64-bit division and hence should be fast on 32-bit machines.
336 */ 297 */
337 static 298 static
338 char *put_dec(char *buf, unsigned long long n) 299 char *put_dec(char *buf, unsigned long long n)
339 { 300 {
340 uint32_t d3, d2, d1, q, h; 301 uint32_t d3, d2, d1, q, h;
341 302
342 if (n < 100*1000*1000) 303 if (n < 100*1000*1000)
343 return put_dec_trunc8(buf, n); 304 return put_dec_trunc8(buf, n);
344 305
345 d1 = ((uint32_t)n >> 16); /* implicit 306 d1 = ((uint32_t)n >> 16); /* implicit "& 0xffff" */
346 h = (n >> 32); 307 h = (n >> 32);
347 d2 = (h ) & 0xffff; 308 d2 = (h ) & 0xffff;
348 d3 = (h >> 16); /* implicit "& 0xffff 309 d3 = (h >> 16); /* implicit "& 0xffff" */
349 310
350 /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d 311 /* n = 2^48 d3 + 2^32 d2 + 2^16 d1 + d0
351 = 281_4749_7671_0656 d3 + 42_9496 312 = 281_4749_7671_0656 d3 + 42_9496_7296 d2 + 6_5536 d1 + d0 */
352 q = 656 * d3 + 7296 * d2 + 5536 * d1 313 q = 656 * d3 + 7296 * d2 + 5536 * d1 + ((uint32_t)n & 0xffff);
353 q = put_dec_helper4(buf, q); 314 q = put_dec_helper4(buf, q);
354 315
355 q += 7671 * d3 + 9496 * d2 + 6 * d1; 316 q += 7671 * d3 + 9496 * d2 + 6 * d1;
356 q = put_dec_helper4(buf+4, q); 317 q = put_dec_helper4(buf+4, q);
357 318
358 q += 4749 * d3 + 42 * d2; 319 q += 4749 * d3 + 42 * d2;
359 q = put_dec_helper4(buf+8, q); 320 q = put_dec_helper4(buf+8, q);
360 321
361 q += 281 * d3; 322 q += 281 * d3;
362 buf += 12; 323 buf += 12;
363 if (q) 324 if (q)
364 buf = put_dec_trunc8(buf, q); 325 buf = put_dec_trunc8(buf, q);
365 else while (buf[-1] == '') 326 else while (buf[-1] == '')
366 --buf; 327 --buf;
367 328
368 return buf; 329 return buf;
369 } 330 }
370 331
371 #endif 332 #endif
372 333
373 /* 334 /*
374 * Convert passed number to decimal string. 335 * Convert passed number to decimal string.
375 * Returns the length of string. On buffer ov 336 * Returns the length of string. On buffer overflow, returns 0.
376 * 337 *
377 * If speed is not important, use snprintf(). 338 * If speed is not important, use snprintf(). It's easy to read the code.
378 */ 339 */
379 int num_to_str(char *buf, int size, unsigned l 340 int num_to_str(char *buf, int size, unsigned long long num, unsigned int width)
380 { 341 {
381 /* put_dec requires 2-byte alignment o 342 /* put_dec requires 2-byte alignment of the buffer. */
382 char tmp[sizeof(num) * 3] __aligned(2) 343 char tmp[sizeof(num) * 3] __aligned(2);
383 int idx, len; 344 int idx, len;
384 345
385 /* put_dec() may work incorrectly for 346 /* put_dec() may work incorrectly for num = 0 (generate "", not "") */
386 if (num <= 9) { 347 if (num <= 9) {
387 tmp[0] = '' + num; 348 tmp[0] = '' + num;
388 len = 1; 349 len = 1;
389 } else { 350 } else {
390 len = put_dec(tmp, num) - tmp; 351 len = put_dec(tmp, num) - tmp;
391 } 352 }
392 353
393 if (len > size || width > size) 354 if (len > size || width > size)
394 return 0; 355 return 0;
395 356
396 if (width > len) { 357 if (width > len) {
397 width = width - len; 358 width = width - len;
398 for (idx = 0; idx < width; idx 359 for (idx = 0; idx < width; idx++)
399 buf[idx] = ' '; 360 buf[idx] = ' ';
400 } else { 361 } else {
401 width = 0; 362 width = 0;
402 } 363 }
403 364
404 for (idx = 0; idx < len; ++idx) 365 for (idx = 0; idx < len; ++idx)
405 buf[idx + width] = tmp[len - i 366 buf[idx + width] = tmp[len - idx - 1];
406 367
407 return len + width; 368 return len + width;
408 } 369 }
409 370
410 #define SIGN 1 /* unsigned/si 371 #define SIGN 1 /* unsigned/signed, must be 1 */
411 #define LEFT 2 /* left justif 372 #define LEFT 2 /* left justified */
412 #define PLUS 4 /* show plus * 373 #define PLUS 4 /* show plus */
413 #define SPACE 8 /* space if pl 374 #define SPACE 8 /* space if plus */
414 #define ZEROPAD 16 /* pad with ze 375 #define ZEROPAD 16 /* pad with zero, must be 16 == '' - ' ' */
415 #define SMALL 32 /* use lowerca 376 #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
416 #define SPECIAL 64 /* prefix hex 377 #define SPECIAL 64 /* prefix hex with "0x", octal with "" */
417 378
418 static_assert(SIGN == 1); <<
419 static_assert(ZEROPAD == ('' - ' ')); <<
420 static_assert(SMALL == ('a' ^ 'A')); <<
421 <<
422 enum format_type { 379 enum format_type {
423 FORMAT_TYPE_NONE, /* Just a string par 380 FORMAT_TYPE_NONE, /* Just a string part */
424 FORMAT_TYPE_WIDTH, 381 FORMAT_TYPE_WIDTH,
425 FORMAT_TYPE_PRECISION, 382 FORMAT_TYPE_PRECISION,
426 FORMAT_TYPE_CHAR, 383 FORMAT_TYPE_CHAR,
427 FORMAT_TYPE_STR, 384 FORMAT_TYPE_STR,
428 FORMAT_TYPE_PTR, 385 FORMAT_TYPE_PTR,
429 FORMAT_TYPE_PERCENT_CHAR, 386 FORMAT_TYPE_PERCENT_CHAR,
430 FORMAT_TYPE_INVALID, 387 FORMAT_TYPE_INVALID,
431 FORMAT_TYPE_LONG_LONG, 388 FORMAT_TYPE_LONG_LONG,
432 FORMAT_TYPE_ULONG, 389 FORMAT_TYPE_ULONG,
433 FORMAT_TYPE_LONG, 390 FORMAT_TYPE_LONG,
434 FORMAT_TYPE_UBYTE, 391 FORMAT_TYPE_UBYTE,
435 FORMAT_TYPE_BYTE, 392 FORMAT_TYPE_BYTE,
436 FORMAT_TYPE_USHORT, 393 FORMAT_TYPE_USHORT,
437 FORMAT_TYPE_SHORT, 394 FORMAT_TYPE_SHORT,
438 FORMAT_TYPE_UINT, 395 FORMAT_TYPE_UINT,
439 FORMAT_TYPE_INT, 396 FORMAT_TYPE_INT,
440 FORMAT_TYPE_SIZE_T, 397 FORMAT_TYPE_SIZE_T,
441 FORMAT_TYPE_PTRDIFF 398 FORMAT_TYPE_PTRDIFF
442 }; 399 };
443 400
444 struct printf_spec { 401 struct printf_spec {
445 unsigned int type:8; /* for 402 unsigned int type:8; /* format_type enum */
446 signed int field_width:24; /* wid 403 signed int field_width:24; /* width of output field */
447 unsigned int flags:8; /* fla 404 unsigned int flags:8; /* flags to number() */
448 unsigned int base:8; /* num 405 unsigned int base:8; /* number base, 8, 10 or 16 only */
449 signed int precision:16; /* # o 406 signed int precision:16; /* # of digits/chars */
450 } __packed; 407 } __packed;
451 static_assert(sizeof(struct printf_spec) == 8) <<
452 <<
453 #define FIELD_WIDTH_MAX ((1 << 23) - 1) 408 #define FIELD_WIDTH_MAX ((1 << 23) - 1)
454 #define PRECISION_MAX ((1 << 15) - 1) 409 #define PRECISION_MAX ((1 << 15) - 1)
455 410
456 static noinline_for_stack 411 static noinline_for_stack
457 char *number(char *buf, char *end, unsigned lo 412 char *number(char *buf, char *end, unsigned long long num,
458 struct printf_spec spec) 413 struct printf_spec spec)
459 { 414 {
460 /* put_dec requires 2-byte alignment o 415 /* put_dec requires 2-byte alignment of the buffer. */
461 char tmp[3 * sizeof(num)] __aligned(2) 416 char tmp[3 * sizeof(num)] __aligned(2);
462 char sign; 417 char sign;
463 char locase; 418 char locase;
464 int need_pfx = ((spec.flags & SPECIAL) 419 int need_pfx = ((spec.flags & SPECIAL) && spec.base != 10);
465 int i; 420 int i;
466 bool is_zero = num == 0LL; 421 bool is_zero = num == 0LL;
467 int field_width = spec.field_width; 422 int field_width = spec.field_width;
468 int precision = spec.precision; 423 int precision = spec.precision;
469 424
>> 425 BUILD_BUG_ON(sizeof(struct printf_spec) != 8);
>> 426
470 /* locase = 0 or 0x20. ORing digits or 427 /* locase = 0 or 0x20. ORing digits or letters with 'locase'
471 * produces same digits or (maybe lowe 428 * produces same digits or (maybe lowercased) letters */
472 locase = (spec.flags & SMALL); 429 locase = (spec.flags & SMALL);
473 if (spec.flags & LEFT) 430 if (spec.flags & LEFT)
474 spec.flags &= ~ZEROPAD; 431 spec.flags &= ~ZEROPAD;
475 sign = 0; 432 sign = 0;
476 if (spec.flags & SIGN) { 433 if (spec.flags & SIGN) {
477 if ((signed long long)num < 0) 434 if ((signed long long)num < 0) {
478 sign = '-'; 435 sign = '-';
479 num = -(signed long lo 436 num = -(signed long long)num;
480 field_width--; 437 field_width--;
481 } else if (spec.flags & PLUS) 438 } else if (spec.flags & PLUS) {
482 sign = '+'; 439 sign = '+';
483 field_width--; 440 field_width--;
484 } else if (spec.flags & SPACE) 441 } else if (spec.flags & SPACE) {
485 sign = ' '; 442 sign = ' ';
486 field_width--; 443 field_width--;
487 } 444 }
488 } 445 }
489 if (need_pfx) { 446 if (need_pfx) {
490 if (spec.base == 16) 447 if (spec.base == 16)
491 field_width -= 2; 448 field_width -= 2;
492 else if (!is_zero) 449 else if (!is_zero)
493 field_width--; 450 field_width--;
494 } 451 }
495 452
496 /* generate full string in tmp[], in r 453 /* generate full string in tmp[], in reverse order */
497 i = 0; 454 i = 0;
498 if (num < spec.base) 455 if (num < spec.base)
499 tmp[i++] = hex_asc_upper[num] 456 tmp[i++] = hex_asc_upper[num] | locase;
500 else if (spec.base != 10) { /* 8 or 16 457 else if (spec.base != 10) { /* 8 or 16 */
501 int mask = spec.base - 1; 458 int mask = spec.base - 1;
502 int shift = 3; 459 int shift = 3;
503 460
504 if (spec.base == 16) 461 if (spec.base == 16)
505 shift = 4; 462 shift = 4;
506 do { 463 do {
507 tmp[i++] = (hex_asc_up 464 tmp[i++] = (hex_asc_upper[((unsigned char)num) & mask] | locase);
508 num >>= shift; 465 num >>= shift;
509 } while (num); 466 } while (num);
510 } else { /* base 10 */ 467 } else { /* base 10 */
511 i = put_dec(tmp, num) - tmp; 468 i = put_dec(tmp, num) - tmp;
512 } 469 }
513 470
514 /* printing 100 using %2d gives "100", 471 /* printing 100 using %2d gives "100", not "00" */
515 if (i > precision) 472 if (i > precision)
516 precision = i; 473 precision = i;
517 /* leading space padding */ 474 /* leading space padding */
518 field_width -= precision; 475 field_width -= precision;
519 if (!(spec.flags & (ZEROPAD | LEFT))) 476 if (!(spec.flags & (ZEROPAD | LEFT))) {
520 while (--field_width >= 0) { 477 while (--field_width >= 0) {
521 if (buf < end) 478 if (buf < end)
522 *buf = ' '; 479 *buf = ' ';
523 ++buf; 480 ++buf;
524 } 481 }
525 } 482 }
526 /* sign */ 483 /* sign */
527 if (sign) { 484 if (sign) {
528 if (buf < end) 485 if (buf < end)
529 *buf = sign; 486 *buf = sign;
530 ++buf; 487 ++buf;
531 } 488 }
532 /* "0x" / "" prefix */ 489 /* "0x" / "" prefix */
533 if (need_pfx) { 490 if (need_pfx) {
534 if (spec.base == 16 || !is_zer 491 if (spec.base == 16 || !is_zero) {
535 if (buf < end) 492 if (buf < end)
536 *buf = ''; 493 *buf = '';
537 ++buf; 494 ++buf;
538 } 495 }
539 if (spec.base == 16) { 496 if (spec.base == 16) {
540 if (buf < end) 497 if (buf < end)
541 *buf = ('X' | 498 *buf = ('X' | locase);
542 ++buf; 499 ++buf;
543 } 500 }
544 } 501 }
545 /* zero or space padding */ 502 /* zero or space padding */
546 if (!(spec.flags & LEFT)) { 503 if (!(spec.flags & LEFT)) {
547 char c = ' ' + (spec.flags & Z 504 char c = ' ' + (spec.flags & ZEROPAD);
548 !! 505 BUILD_BUG_ON(' ' + ZEROPAD != '');
549 while (--field_width >= 0) { 506 while (--field_width >= 0) {
550 if (buf < end) 507 if (buf < end)
551 *buf = c; 508 *buf = c;
552 ++buf; 509 ++buf;
553 } 510 }
554 } 511 }
555 /* hmm even more zero padding? */ 512 /* hmm even more zero padding? */
556 while (i <= --precision) { 513 while (i <= --precision) {
557 if (buf < end) 514 if (buf < end)
558 *buf = ''; 515 *buf = '';
559 ++buf; 516 ++buf;
560 } 517 }
561 /* actual digits of result */ 518 /* actual digits of result */
562 while (--i >= 0) { 519 while (--i >= 0) {
563 if (buf < end) 520 if (buf < end)
564 *buf = tmp[i]; 521 *buf = tmp[i];
565 ++buf; 522 ++buf;
566 } 523 }
567 /* trailing space padding */ 524 /* trailing space padding */
568 while (--field_width >= 0) { 525 while (--field_width >= 0) {
569 if (buf < end) 526 if (buf < end)
570 *buf = ' '; 527 *buf = ' ';
571 ++buf; 528 ++buf;
572 } 529 }
573 530
574 return buf; 531 return buf;
575 } 532 }
576 533
577 static noinline_for_stack 534 static noinline_for_stack
578 char *special_hex_number(char *buf, char *end, 535 char *special_hex_number(char *buf, char *end, unsigned long long num, int size)
579 { 536 {
580 struct printf_spec spec; 537 struct printf_spec spec;
581 538
582 spec.type = FORMAT_TYPE_PTR; 539 spec.type = FORMAT_TYPE_PTR;
583 spec.field_width = 2 + 2 * size; 540 spec.field_width = 2 + 2 * size; /* 0x + hex */
584 spec.flags = SPECIAL | SMALL | ZEROPAD 541 spec.flags = SPECIAL | SMALL | ZEROPAD;
585 spec.base = 16; 542 spec.base = 16;
586 spec.precision = -1; 543 spec.precision = -1;
587 544
588 return number(buf, end, num, spec); 545 return number(buf, end, num, spec);
589 } 546 }
590 547
591 static void move_right(char *buf, char *end, u 548 static void move_right(char *buf, char *end, unsigned len, unsigned spaces)
592 { 549 {
593 size_t size; 550 size_t size;
594 if (buf >= end) /* nowhere to put anyt 551 if (buf >= end) /* nowhere to put anything */
595 return; 552 return;
596 size = end - buf; 553 size = end - buf;
597 if (size <= spaces) { 554 if (size <= spaces) {
598 memset(buf, ' ', size); 555 memset(buf, ' ', size);
599 return; 556 return;
600 } 557 }
601 if (len) { 558 if (len) {
602 if (len > size - spaces) 559 if (len > size - spaces)
603 len = size - spaces; 560 len = size - spaces;
604 memmove(buf + spaces, buf, len 561 memmove(buf + spaces, buf, len);
605 } 562 }
606 memset(buf, ' ', spaces); 563 memset(buf, ' ', spaces);
607 } 564 }
608 565
609 /* 566 /*
610 * Handle field width padding for a string. 567 * Handle field width padding for a string.
611 * @buf: current buffer position 568 * @buf: current buffer position
612 * @n: length of string 569 * @n: length of string
613 * @end: end of output buffer 570 * @end: end of output buffer
614 * @spec: for field width and flags 571 * @spec: for field width and flags
615 * Returns: new buffer position after padding. 572 * Returns: new buffer position after padding.
616 */ 573 */
617 static noinline_for_stack 574 static noinline_for_stack
618 char *widen_string(char *buf, int n, char *end 575 char *widen_string(char *buf, int n, char *end, struct printf_spec spec)
619 { 576 {
620 unsigned spaces; 577 unsigned spaces;
621 578
622 if (likely(n >= spec.field_width)) 579 if (likely(n >= spec.field_width))
623 return buf; 580 return buf;
624 /* we want to pad the sucker */ 581 /* we want to pad the sucker */
625 spaces = spec.field_width - n; 582 spaces = spec.field_width - n;
626 if (!(spec.flags & LEFT)) { 583 if (!(spec.flags & LEFT)) {
627 move_right(buf - n, end, n, sp 584 move_right(buf - n, end, n, spaces);
628 return buf + spaces; 585 return buf + spaces;
629 } 586 }
630 while (spaces--) { 587 while (spaces--) {
631 if (buf < end) 588 if (buf < end)
632 *buf = ' '; 589 *buf = ' ';
633 ++buf; 590 ++buf;
634 } 591 }
635 return buf; 592 return buf;
636 } 593 }
637 594
638 /* Handle string from a well known address. */ !! 595 static noinline_for_stack
639 static char *string_nocheck(char *buf, char *e !! 596 char *string(char *buf, char *end, const char *s, struct printf_spec spec)
640 struct printf_spec <<
641 { 597 {
642 int len = 0; 598 int len = 0;
643 int lim = spec.precision; !! 599 size_t lim = spec.precision;
>> 600
>> 601 if ((unsigned long)s < PAGE_SIZE)
>> 602 s = "(null)";
644 603
645 while (lim--) { 604 while (lim--) {
646 char c = *s++; 605 char c = *s++;
647 if (!c) 606 if (!c)
648 break; 607 break;
649 if (buf < end) 608 if (buf < end)
650 *buf = c; 609 *buf = c;
651 ++buf; 610 ++buf;
652 ++len; 611 ++len;
653 } 612 }
654 return widen_string(buf, len, end, spe 613 return widen_string(buf, len, end, spec);
655 } 614 }
656 615
657 static char *err_ptr(char *buf, char *end, voi <<
658 struct printf_spec spec) <<
659 { <<
660 int err = PTR_ERR(ptr); <<
661 const char *sym = errname(err); <<
662 <<
663 if (sym) <<
664 return string_nocheck(buf, end <<
665 <<
666 /* <<
667 * Somebody passed ERR_PTR(-1234) or s <<
668 * Efoo - or perhaps CONFIG_SYMBOLIC_E <<
669 * printing it as its decimal represen <<
670 */ <<
671 spec.flags |= SIGN; <<
672 spec.base = 10; <<
673 return number(buf, end, err, spec); <<
674 } <<
675 <<
676 /* Be careful: error messages must fit into th <<
677 static char *error_string(char *buf, char *end <<
678 struct printf_spec s <<
679 { <<
680 /* <<
681 * Hard limit to avoid a completely in <<
682 * works pretty well because most erro <<
683 * the many pointer format modifiers. <<
684 */ <<
685 if (spec.precision == -1) <<
686 spec.precision = 2 * sizeof(vo <<
687 <<
688 return string_nocheck(buf, end, s, spe <<
689 } <<
690 <<
691 /* <<
692 * Do not call any complex external code here. <<
693 * might cause infinite loops. Failures might <<
694 * be hard to debug. <<
695 */ <<
696 static const char *check_pointer_msg(const voi <<
697 { <<
698 if (!ptr) <<
699 return "(null)"; <<
700 <<
701 if ((unsigned long)ptr < PAGE_SIZE || <<
702 return "(efault)"; <<
703 <<
704 return NULL; <<
705 } <<
706 <<
707 static int check_pointer(char **buf, char *end <<
708 struct printf_spec sp <<
709 { <<
710 const char *err_msg; <<
711 <<
712 err_msg = check_pointer_msg(ptr); <<
713 if (err_msg) { <<
714 *buf = error_string(*buf, end, <<
715 return -EFAULT; <<
716 } <<
717 <<
718 return 0; <<
719 } <<
720 <<
721 static noinline_for_stack 616 static noinline_for_stack
722 char *string(char *buf, char *end, const char !! 617 char *pointer_string(char *buf, char *end, const void *ptr,
723 struct printf_spec spec) !! 618 struct printf_spec spec)
724 { <<
725 if (check_pointer(&buf, end, s, spec)) <<
726 return buf; <<
727 <<
728 return string_nocheck(buf, end, s, spe <<
729 } <<
730 <<
731 static char *pointer_string(char *buf, char *e <<
732 const void *ptr, <<
733 struct printf_spec <<
734 { 619 {
735 spec.base = 16; 620 spec.base = 16;
736 spec.flags |= SMALL; 621 spec.flags |= SMALL;
737 if (spec.field_width == -1) { 622 if (spec.field_width == -1) {
738 spec.field_width = 2 * sizeof( 623 spec.field_width = 2 * sizeof(ptr);
739 spec.flags |= ZEROPAD; 624 spec.flags |= ZEROPAD;
740 } 625 }
741 626
742 return number(buf, end, (unsigned long 627 return number(buf, end, (unsigned long int)ptr, spec);
743 } 628 }
744 629
745 /* Make pointers available for printing early 630 /* Make pointers available for printing early in the boot sequence. */
746 static int debug_boot_weak_hash __ro_after_ini 631 static int debug_boot_weak_hash __ro_after_init;
747 632
748 static int __init debug_boot_weak_hash_enable( 633 static int __init debug_boot_weak_hash_enable(char *str)
749 { 634 {
750 debug_boot_weak_hash = 1; 635 debug_boot_weak_hash = 1;
751 pr_info("debug_boot_weak_hash enabled\ 636 pr_info("debug_boot_weak_hash enabled\n");
752 return 0; 637 return 0;
753 } 638 }
754 early_param("debug_boot_weak_hash", debug_boot 639 early_param("debug_boot_weak_hash", debug_boot_weak_hash_enable);
755 640
756 static bool filled_random_ptr_key __read_mostl !! 641 static DEFINE_STATIC_KEY_TRUE(not_filled_random_ptr_key);
757 static siphash_key_t ptr_key __read_mostly; 642 static siphash_key_t ptr_key __read_mostly;
758 643
759 static int fill_ptr_key(struct notifier_block !! 644 static void enable_ptr_key_workfn(struct work_struct *work)
760 { 645 {
761 get_random_bytes(&ptr_key, sizeof(ptr_ 646 get_random_bytes(&ptr_key, sizeof(ptr_key));
762 !! 647 /* Needs to run from preemptible context */
763 /* Pairs with smp_rmb() before reading !! 648 static_branch_disable(¬_filled_random_ptr_key);
764 smp_wmb(); <<
765 WRITE_ONCE(filled_random_ptr_key, true <<
766 return NOTIFY_DONE; <<
767 } 649 }
768 650
769 static int __init vsprintf_init_hashval(void) !! 651 static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn);
>> 652
>> 653 static void fill_random_ptr_key(struct random_ready_callback *unused)
770 { 654 {
771 static struct notifier_block fill_ptr_ !! 655 /* This may be in an interrupt handler. */
772 execute_with_initialized_rng(&fill_ptr !! 656 queue_work(system_unbound_wq, &enable_ptr_key_work);
773 return 0; <<
774 } 657 }
775 subsys_initcall(vsprintf_init_hashval) <<
776 658
777 /* Maps a pointer to a 32 bit unique identifie !! 659 static struct random_ready_callback random_ready = {
778 static inline int __ptr_to_hashval(const void !! 660 .func = fill_random_ptr_key
779 { !! 661 };
780 unsigned long hashval; <<
781 662
782 if (!READ_ONCE(filled_random_ptr_key)) !! 663 static int __init initialize_ptr_random(void)
783 return -EBUSY; !! 664 {
>> 665 int key_size = sizeof(ptr_key);
>> 666 int ret;
784 667
785 /* Pairs with smp_wmb() after writing !! 668 /* Use hw RNG if available. */
786 smp_rmb(); !! 669 if (get_random_bytes_arch(&ptr_key, key_size) == key_size) {
>> 670 static_branch_disable(¬_filled_random_ptr_key);
>> 671 return 0;
>> 672 }
787 673
788 #ifdef CONFIG_64BIT !! 674 ret = add_random_ready_callback(&random_ready);
789 hashval = (unsigned long)siphash_1u64( !! 675 if (!ret) {
790 /* !! 676 return 0;
791 * Mask off the first 32 bits, this ma !! 677 } else if (ret == -EALREADY) {
792 * modified the address (and 32 bits i !! 678 /* This is in preemptible context */
793 */ !! 679 enable_ptr_key_workfn(&enable_ptr_key_work);
794 hashval = hashval & 0xffffffff; !! 680 return 0;
795 #else !! 681 }
796 hashval = (unsigned long)siphash_1u32( <<
797 #endif <<
798 *hashval_out = hashval; <<
799 return 0; <<
800 } <<
801 682
802 int ptr_to_hashval(const void *ptr, unsigned l !! 683 return ret;
803 { <<
804 return __ptr_to_hashval(ptr, hashval_o <<
805 } 684 }
>> 685 early_initcall(initialize_ptr_random);
806 686
>> 687 /* Maps a pointer to a 32 bit unique identifier. */
807 static char *ptr_to_id(char *buf, char *end, c 688 static char *ptr_to_id(char *buf, char *end, const void *ptr,
808 struct printf_spec spec 689 struct printf_spec spec)
809 { 690 {
810 const char *str = sizeof(ptr) == 8 ? " 691 const char *str = sizeof(ptr) == 8 ? "(____ptrval____)" : "(ptrval)";
811 unsigned long hashval; 692 unsigned long hashval;
812 int ret; <<
813 <<
814 /* <<
815 * Print the real pointer value for NU <<
816 * as they are not actual addresses. <<
817 */ <<
818 if (IS_ERR_OR_NULL(ptr)) <<
819 return pointer_string(buf, end <<
820 693
821 /* When debugging early boot use non-c 694 /* When debugging early boot use non-cryptographically secure hash. */
822 if (unlikely(debug_boot_weak_hash)) { 695 if (unlikely(debug_boot_weak_hash)) {
823 hashval = hash_long((unsigned 696 hashval = hash_long((unsigned long)ptr, 32);
824 return pointer_string(buf, end 697 return pointer_string(buf, end, (const void *)hashval, spec);
825 } 698 }
826 699
827 ret = __ptr_to_hashval(ptr, &hashval); !! 700 if (static_branch_unlikely(¬_filled_random_ptr_key)) {
828 if (ret) { <<
829 spec.field_width = 2 * sizeof( 701 spec.field_width = 2 * sizeof(ptr);
830 /* string length must be less 702 /* string length must be less than default_width */
831 return error_string(buf, end, !! 703 return string(buf, end, str, spec);
832 } 704 }
833 705
834 return pointer_string(buf, end, (const !! 706 #ifdef CONFIG_64BIT
835 } !! 707 hashval = (unsigned long)siphash_1u64((u64)ptr, &ptr_key);
836 <<
837 static char *default_pointer(char *buf, char * <<
838 struct printf_spe <<
839 { <<
840 /* 708 /*
841 * default is to _not_ leak addresses, !! 709 * Mask off the first 32 bits, this makes explicit that we have
842 * unless no_hash_pointers is specifie !! 710 * modified the address (and 32 bits is plenty for a unique ID).
843 */ 711 */
844 if (unlikely(no_hash_pointers)) !! 712 hashval = hashval & 0xffffffff;
845 return pointer_string(buf, end !! 713 #else
846 !! 714 hashval = (unsigned long)siphash_1u32((u32)ptr, &ptr_key);
847 return ptr_to_id(buf, end, ptr, spec); !! 715 #endif
848 } !! 716 return pointer_string(buf, end, (const void *)hashval, spec);
849 <<
850 int kptr_restrict __read_mostly; <<
851 <<
852 static noinline_for_stack <<
853 char *restricted_pointer(char *buf, char *end, <<
854 struct printf_spec sp <<
855 { <<
856 switch (kptr_restrict) { <<
857 case 0: <<
858 /* Handle as %p, hash and do _ <<
859 return default_pointer(buf, en <<
860 case 1: { <<
861 const struct cred *cred; <<
862 <<
863 /* <<
864 * kptr_restrict==1 cannot be <<
865 * because its test for CAP_SY <<
866 */ <<
867 if (in_hardirq() || in_serving <<
868 if (spec.field_width = <<
869 spec.field_wid <<
870 return error_string(bu <<
871 } <<
872 <<
873 /* <<
874 * Only print the real pointer <<
875 * process has CAP_SYSLOG and <<
876 * same credentials it started <<
877 * access to files is checked <<
878 * checks permission at read() <<
879 * leak pointer values if a bi <<
880 * %pK and then elevates privi <<
881 */ <<
882 cred = current_cred(); <<
883 if (!has_capability_noaudit(cu <<
884 !uid_eq(cred->euid, cred-> <<
885 !gid_eq(cred->egid, cred-> <<
886 ptr = NULL; <<
887 break; <<
888 } <<
889 case 2: <<
890 default: <<
891 /* Always print 0's for %pK */ <<
892 ptr = NULL; <<
893 break; <<
894 } <<
895 <<
896 return pointer_string(buf, end, ptr, s <<
897 } 717 }
898 718
899 static noinline_for_stack 719 static noinline_for_stack
900 char *dentry_name(char *buf, char *end, const 720 char *dentry_name(char *buf, char *end, const struct dentry *d, struct printf_spec spec,
901 const char *fmt) 721 const char *fmt)
902 { 722 {
903 const char *array[4], *s; 723 const char *array[4], *s;
904 const struct dentry *p; 724 const struct dentry *p;
905 int depth; 725 int depth;
906 int i, n; 726 int i, n;
907 727
908 switch (fmt[1]) { 728 switch (fmt[1]) {
909 case '2': case '3': case '4': 729 case '2': case '3': case '4':
910 depth = fmt[1] - ''; 730 depth = fmt[1] - '';
911 break; 731 break;
912 default: 732 default:
913 depth = 1; 733 depth = 1;
914 } 734 }
915 735
916 rcu_read_lock(); 736 rcu_read_lock();
917 for (i = 0; i < depth; i++, d = p) { 737 for (i = 0; i < depth; i++, d = p) {
918 if (check_pointer(&buf, end, d <<
919 rcu_read_unlock(); <<
920 return buf; <<
921 } <<
922 <<
923 p = READ_ONCE(d->d_parent); 738 p = READ_ONCE(d->d_parent);
924 array[i] = READ_ONCE(d->d_name 739 array[i] = READ_ONCE(d->d_name.name);
925 if (p == d) { 740 if (p == d) {
926 if (i) 741 if (i)
927 array[i] = ""; 742 array[i] = "";
928 i++; 743 i++;
929 break; 744 break;
930 } 745 }
931 } 746 }
932 s = array[--i]; 747 s = array[--i];
933 for (n = 0; n != spec.precision; n++, 748 for (n = 0; n != spec.precision; n++, buf++) {
934 char c = *s++; 749 char c = *s++;
935 if (!c) { 750 if (!c) {
936 if (!i) 751 if (!i)
937 break; 752 break;
938 c = '/'; 753 c = '/';
939 s = array[--i]; 754 s = array[--i];
940 } 755 }
941 if (buf < end) 756 if (buf < end)
942 *buf = c; 757 *buf = c;
943 } 758 }
944 rcu_read_unlock(); 759 rcu_read_unlock();
945 return widen_string(buf, n, end, spec) 760 return widen_string(buf, n, end, spec);
946 } 761 }
947 762
948 static noinline_for_stack <<
949 char *file_dentry_name(char *buf, char *end, c <<
950 struct printf_spec spe <<
951 { <<
952 if (check_pointer(&buf, end, f, spec)) <<
953 return buf; <<
954 <<
955 return dentry_name(buf, end, f->f_path <<
956 } <<
957 #ifdef CONFIG_BLOCK 763 #ifdef CONFIG_BLOCK
958 static noinline_for_stack 764 static noinline_for_stack
959 char *bdev_name(char *buf, char *end, struct b 765 char *bdev_name(char *buf, char *end, struct block_device *bdev,
960 struct printf_spec spec, const 766 struct printf_spec spec, const char *fmt)
961 { 767 {
962 struct gendisk *hd; !! 768 struct gendisk *hd = bdev->bd_disk;
963 !! 769
964 if (check_pointer(&buf, end, bdev, spe <<
965 return buf; <<
966 <<
967 hd = bdev->bd_disk; <<
968 buf = string(buf, end, hd->disk_name, 770 buf = string(buf, end, hd->disk_name, spec);
969 if (bdev_is_partition(bdev)) { !! 771 if (bdev->bd_part->partno) {
970 if (isdigit(hd->disk_name[strl 772 if (isdigit(hd->disk_name[strlen(hd->disk_name)-1])) {
971 if (buf < end) 773 if (buf < end)
972 *buf = 'p'; 774 *buf = 'p';
973 buf++; 775 buf++;
974 } 776 }
975 buf = number(buf, end, bdev_pa !! 777 buf = number(buf, end, bdev->bd_part->partno, spec);
976 } 778 }
977 return buf; 779 return buf;
978 } 780 }
979 #endif 781 #endif
980 782
981 static noinline_for_stack 783 static noinline_for_stack
982 char *symbol_string(char *buf, char *end, void 784 char *symbol_string(char *buf, char *end, void *ptr,
983 struct printf_spec spec, c 785 struct printf_spec spec, const char *fmt)
984 { 786 {
985 unsigned long value; 787 unsigned long value;
986 #ifdef CONFIG_KALLSYMS 788 #ifdef CONFIG_KALLSYMS
987 char sym[KSYM_SYMBOL_LEN]; 789 char sym[KSYM_SYMBOL_LEN];
988 #endif 790 #endif
989 791
990 if (fmt[1] == 'R') 792 if (fmt[1] == 'R')
991 ptr = __builtin_extract_return 793 ptr = __builtin_extract_return_addr(ptr);
992 value = (unsigned long)ptr; 794 value = (unsigned long)ptr;
993 795
994 #ifdef CONFIG_KALLSYMS 796 #ifdef CONFIG_KALLSYMS
995 if (*fmt == 'B' && fmt[1] == 'b') !! 797 if (*fmt == 'B')
996 sprint_backtrace_build_id(sym, <<
997 else if (*fmt == 'B') <<
998 sprint_backtrace(sym, value); 798 sprint_backtrace(sym, value);
999 else if (*fmt == 'S' && (fmt[1] == 'b' !! 799 else if (*fmt != 'f' && *fmt != 's')
1000 sprint_symbol_build_id(sym, v <<
1001 else if (*fmt != 's') <<
1002 sprint_symbol(sym, value); 800 sprint_symbol(sym, value);
1003 else 801 else
1004 sprint_symbol_no_offset(sym, 802 sprint_symbol_no_offset(sym, value);
1005 803
1006 return string_nocheck(buf, end, sym, !! 804 return string(buf, end, sym, spec);
1007 #else 805 #else
1008 return special_hex_number(buf, end, v 806 return special_hex_number(buf, end, value, sizeof(void *));
1009 #endif 807 #endif
1010 } 808 }
1011 809
1012 static const struct printf_spec default_str_s 810 static const struct printf_spec default_str_spec = {
1013 .field_width = -1, 811 .field_width = -1,
1014 .precision = -1, 812 .precision = -1,
1015 }; 813 };
1016 814
1017 static const struct printf_spec default_flag_ 815 static const struct printf_spec default_flag_spec = {
1018 .base = 16, 816 .base = 16,
1019 .precision = -1, 817 .precision = -1,
1020 .flags = SPECIAL | SMALL, 818 .flags = SPECIAL | SMALL,
1021 }; 819 };
1022 820
1023 static const struct printf_spec default_dec_s 821 static const struct printf_spec default_dec_spec = {
1024 .base = 10, 822 .base = 10,
1025 .precision = -1, 823 .precision = -1,
1026 }; 824 };
1027 825
1028 static const struct printf_spec default_dec02 826 static const struct printf_spec default_dec02_spec = {
1029 .base = 10, 827 .base = 10,
1030 .field_width = 2, 828 .field_width = 2,
1031 .precision = -1, 829 .precision = -1,
1032 .flags = ZEROPAD, 830 .flags = ZEROPAD,
1033 }; 831 };
1034 832
1035 static const struct printf_spec default_dec04 833 static const struct printf_spec default_dec04_spec = {
1036 .base = 10, 834 .base = 10,
1037 .field_width = 4, 835 .field_width = 4,
1038 .precision = -1, 836 .precision = -1,
1039 .flags = ZEROPAD, 837 .flags = ZEROPAD,
1040 }; 838 };
1041 839
1042 static noinline_for_stack 840 static noinline_for_stack
1043 char *resource_string(char *buf, char *end, s 841 char *resource_string(char *buf, char *end, struct resource *res,
1044 struct printf_spec spec 842 struct printf_spec spec, const char *fmt)
1045 { 843 {
1046 #ifndef IO_RSRC_PRINTK_SIZE 844 #ifndef IO_RSRC_PRINTK_SIZE
1047 #define IO_RSRC_PRINTK_SIZE 6 845 #define IO_RSRC_PRINTK_SIZE 6
1048 #endif 846 #endif
1049 847
1050 #ifndef MEM_RSRC_PRINTK_SIZE 848 #ifndef MEM_RSRC_PRINTK_SIZE
1051 #define MEM_RSRC_PRINTK_SIZE 10 849 #define MEM_RSRC_PRINTK_SIZE 10
1052 #endif 850 #endif
1053 static const struct printf_spec io_sp 851 static const struct printf_spec io_spec = {
1054 .base = 16, 852 .base = 16,
1055 .field_width = IO_RSRC_PRINTK 853 .field_width = IO_RSRC_PRINTK_SIZE,
1056 .precision = -1, 854 .precision = -1,
1057 .flags = SPECIAL | SMALL | ZE 855 .flags = SPECIAL | SMALL | ZEROPAD,
1058 }; 856 };
1059 static const struct printf_spec mem_s 857 static const struct printf_spec mem_spec = {
1060 .base = 16, 858 .base = 16,
1061 .field_width = MEM_RSRC_PRINT 859 .field_width = MEM_RSRC_PRINTK_SIZE,
1062 .precision = -1, 860 .precision = -1,
1063 .flags = SPECIAL | SMALL | ZE 861 .flags = SPECIAL | SMALL | ZEROPAD,
1064 }; 862 };
1065 static const struct printf_spec bus_s 863 static const struct printf_spec bus_spec = {
1066 .base = 16, 864 .base = 16,
1067 .field_width = 2, 865 .field_width = 2,
1068 .precision = -1, 866 .precision = -1,
1069 .flags = SMALL | ZEROPAD, 867 .flags = SMALL | ZEROPAD,
1070 }; 868 };
1071 static const struct printf_spec str_s 869 static const struct printf_spec str_spec = {
1072 .field_width = -1, 870 .field_width = -1,
1073 .precision = 10, 871 .precision = 10,
1074 .flags = LEFT, 872 .flags = LEFT,
1075 }; 873 };
1076 874
1077 /* 32-bit res (sizeof==4): 10 chars i 875 /* 32-bit res (sizeof==4): 10 chars in dec, 10 in hex ("0x" + 8)
1078 * 64-bit res (sizeof==8): 20 chars i 876 * 64-bit res (sizeof==8): 20 chars in dec, 18 in hex ("0x" + 16) */
1079 #define RSRC_BUF_SIZE ((2 * sizeof( 877 #define RSRC_BUF_SIZE ((2 * sizeof(resource_size_t)) + 4)
1080 #define FLAG_BUF_SIZE (2 * sizeof(r 878 #define FLAG_BUF_SIZE (2 * sizeof(res->flags))
1081 #define DECODED_BUF_SIZE sizeof("[mem 879 #define DECODED_BUF_SIZE sizeof("[mem - 64bit pref window disabled]")
1082 #define RAW_BUF_SIZE sizeof("[mem 880 #define RAW_BUF_SIZE sizeof("[mem - flags 0x]")
1083 char sym[MAX(2*RSRC_BUF_SIZE + DECODE !! 881 char sym[max(2*RSRC_BUF_SIZE + DECODED_BUF_SIZE,
1084 2*RSRC_BUF_SIZE + FLAG_B 882 2*RSRC_BUF_SIZE + FLAG_BUF_SIZE + RAW_BUF_SIZE)];
1085 883
1086 char *p = sym, *pend = sym + sizeof(s 884 char *p = sym, *pend = sym + sizeof(sym);
1087 int decode = (fmt[0] == 'R') ? 1 : 0; 885 int decode = (fmt[0] == 'R') ? 1 : 0;
1088 const struct printf_spec *specp; 886 const struct printf_spec *specp;
1089 887
1090 if (check_pointer(&buf, end, res, spe <<
1091 return buf; <<
1092 <<
1093 *p++ = '['; 888 *p++ = '[';
1094 if (res->flags & IORESOURCE_IO) { 889 if (res->flags & IORESOURCE_IO) {
1095 p = string_nocheck(p, pend, " !! 890 p = string(p, pend, "io ", str_spec);
1096 specp = &io_spec; 891 specp = &io_spec;
1097 } else if (res->flags & IORESOURCE_ME 892 } else if (res->flags & IORESOURCE_MEM) {
1098 p = string_nocheck(p, pend, " !! 893 p = string(p, pend, "mem ", str_spec);
1099 specp = &mem_spec; 894 specp = &mem_spec;
1100 } else if (res->flags & IORESOURCE_IR 895 } else if (res->flags & IORESOURCE_IRQ) {
1101 p = string_nocheck(p, pend, " !! 896 p = string(p, pend, "irq ", str_spec);
1102 specp = &default_dec_spec; 897 specp = &default_dec_spec;
1103 } else if (res->flags & IORESOURCE_DM 898 } else if (res->flags & IORESOURCE_DMA) {
1104 p = string_nocheck(p, pend, " !! 899 p = string(p, pend, "dma ", str_spec);
1105 specp = &default_dec_spec; 900 specp = &default_dec_spec;
1106 } else if (res->flags & IORESOURCE_BU 901 } else if (res->flags & IORESOURCE_BUS) {
1107 p = string_nocheck(p, pend, " !! 902 p = string(p, pend, "bus ", str_spec);
1108 specp = &bus_spec; 903 specp = &bus_spec;
1109 } else { 904 } else {
1110 p = string_nocheck(p, pend, " !! 905 p = string(p, pend, "??? ", str_spec);
1111 specp = &mem_spec; 906 specp = &mem_spec;
1112 decode = 0; 907 decode = 0;
1113 } 908 }
1114 if (decode && res->flags & IORESOURCE 909 if (decode && res->flags & IORESOURCE_UNSET) {
1115 p = string_nocheck(p, pend, " !! 910 p = string(p, pend, "size ", str_spec);
1116 p = number(p, pend, resource_ 911 p = number(p, pend, resource_size(res), *specp);
1117 } else { 912 } else {
1118 p = number(p, pend, res->star 913 p = number(p, pend, res->start, *specp);
1119 if (res->start != res->end) { 914 if (res->start != res->end) {
1120 *p++ = '-'; 915 *p++ = '-';
1121 p = number(p, pend, r 916 p = number(p, pend, res->end, *specp);
1122 } 917 }
1123 } 918 }
1124 if (decode) { 919 if (decode) {
1125 if (res->flags & IORESOURCE_M 920 if (res->flags & IORESOURCE_MEM_64)
1126 p = string_nocheck(p, !! 921 p = string(p, pend, " 64bit", str_spec);
1127 if (res->flags & IORESOURCE_P 922 if (res->flags & IORESOURCE_PREFETCH)
1128 p = string_nocheck(p, !! 923 p = string(p, pend, " pref", str_spec);
1129 if (res->flags & IORESOURCE_W 924 if (res->flags & IORESOURCE_WINDOW)
1130 p = string_nocheck(p, !! 925 p = string(p, pend, " window", str_spec);
1131 if (res->flags & IORESOURCE_D 926 if (res->flags & IORESOURCE_DISABLED)
1132 p = string_nocheck(p, !! 927 p = string(p, pend, " disabled", str_spec);
1133 } else { 928 } else {
1134 p = string_nocheck(p, pend, " !! 929 p = string(p, pend, " flags ", str_spec);
1135 p = number(p, pend, res->flag 930 p = number(p, pend, res->flags, default_flag_spec);
1136 } 931 }
1137 *p++ = ']'; 932 *p++ = ']';
1138 *p = '\0'; 933 *p = '\0';
1139 934
1140 return string_nocheck(buf, end, sym, !! 935 return string(buf, end, sym, spec);
1141 } 936 }
1142 937
1143 static noinline_for_stack 938 static noinline_for_stack
1144 char *hex_string(char *buf, char *end, u8 *ad 939 char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1145 const char *fmt) 940 const char *fmt)
1146 { 941 {
1147 int i, len = 1; /* if we pass 942 int i, len = 1; /* if we pass '%ph[CDN]', field width remains
1148 negative v 943 negative value, fallback to the default */
1149 char separator; 944 char separator;
1150 945
1151 if (spec.field_width == 0) 946 if (spec.field_width == 0)
1152 /* nothing to print */ 947 /* nothing to print */
1153 return buf; 948 return buf;
1154 949
1155 if (check_pointer(&buf, end, addr, sp !! 950 if (ZERO_OR_NULL_PTR(addr))
1156 return buf; !! 951 /* NULL pointer */
>> 952 return string(buf, end, NULL, spec);
1157 953
1158 switch (fmt[1]) { 954 switch (fmt[1]) {
1159 case 'C': 955 case 'C':
1160 separator = ':'; 956 separator = ':';
1161 break; 957 break;
1162 case 'D': 958 case 'D':
1163 separator = '-'; 959 separator = '-';
1164 break; 960 break;
1165 case 'N': 961 case 'N':
1166 separator = 0; 962 separator = 0;
1167 break; 963 break;
1168 default: 964 default:
1169 separator = ' '; 965 separator = ' ';
1170 break; 966 break;
1171 } 967 }
1172 968
1173 if (spec.field_width > 0) 969 if (spec.field_width > 0)
1174 len = min_t(int, spec.field_w 970 len = min_t(int, spec.field_width, 64);
1175 971
1176 for (i = 0; i < len; ++i) { 972 for (i = 0; i < len; ++i) {
1177 if (buf < end) 973 if (buf < end)
1178 *buf = hex_asc_hi(add 974 *buf = hex_asc_hi(addr[i]);
1179 ++buf; 975 ++buf;
1180 if (buf < end) 976 if (buf < end)
1181 *buf = hex_asc_lo(add 977 *buf = hex_asc_lo(addr[i]);
1182 ++buf; 978 ++buf;
1183 979
1184 if (separator && i != len - 1 980 if (separator && i != len - 1) {
1185 if (buf < end) 981 if (buf < end)
1186 *buf = separa 982 *buf = separator;
1187 ++buf; 983 ++buf;
1188 } 984 }
1189 } 985 }
1190 986
1191 return buf; 987 return buf;
1192 } 988 }
1193 989
1194 static noinline_for_stack 990 static noinline_for_stack
1195 char *bitmap_string(char *buf, char *end, con !! 991 char *bitmap_string(char *buf, char *end, unsigned long *bitmap,
1196 struct printf_spec spec, 992 struct printf_spec spec, const char *fmt)
1197 { 993 {
1198 const int CHUNKSZ = 32; 994 const int CHUNKSZ = 32;
1199 int nr_bits = max_t(int, spec.field_w 995 int nr_bits = max_t(int, spec.field_width, 0);
1200 int i, chunksz; 996 int i, chunksz;
1201 bool first = true; 997 bool first = true;
1202 998
1203 if (check_pointer(&buf, end, bitmap, <<
1204 return buf; <<
1205 <<
1206 /* reused to print numbers */ 999 /* reused to print numbers */
1207 spec = (struct printf_spec){ .flags = 1000 spec = (struct printf_spec){ .flags = SMALL | ZEROPAD, .base = 16 };
1208 1001
1209 chunksz = nr_bits & (CHUNKSZ - 1); 1002 chunksz = nr_bits & (CHUNKSZ - 1);
1210 if (chunksz == 0) 1003 if (chunksz == 0)
1211 chunksz = CHUNKSZ; 1004 chunksz = CHUNKSZ;
1212 1005
1213 i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ 1006 i = ALIGN(nr_bits, CHUNKSZ) - CHUNKSZ;
1214 for (; i >= 0; i -= CHUNKSZ) { 1007 for (; i >= 0; i -= CHUNKSZ) {
1215 u32 chunkmask, val; 1008 u32 chunkmask, val;
1216 int word, bit; 1009 int word, bit;
1217 1010
1218 chunkmask = ((1ULL << chunksz 1011 chunkmask = ((1ULL << chunksz) - 1);
1219 word = i / BITS_PER_LONG; 1012 word = i / BITS_PER_LONG;
1220 bit = i % BITS_PER_LONG; 1013 bit = i % BITS_PER_LONG;
1221 val = (bitmap[word] >> bit) & 1014 val = (bitmap[word] >> bit) & chunkmask;
1222 1015
1223 if (!first) { 1016 if (!first) {
1224 if (buf < end) 1017 if (buf < end)
1225 *buf = ','; 1018 *buf = ',';
1226 buf++; 1019 buf++;
1227 } 1020 }
1228 first = false; 1021 first = false;
1229 1022
1230 spec.field_width = DIV_ROUND_ 1023 spec.field_width = DIV_ROUND_UP(chunksz, 4);
1231 buf = number(buf, end, val, s 1024 buf = number(buf, end, val, spec);
1232 1025
1233 chunksz = CHUNKSZ; 1026 chunksz = CHUNKSZ;
1234 } 1027 }
1235 return buf; 1028 return buf;
1236 } 1029 }
1237 1030
1238 static noinline_for_stack 1031 static noinline_for_stack
1239 char *bitmap_list_string(char *buf, char *end !! 1032 char *bitmap_list_string(char *buf, char *end, unsigned long *bitmap,
1240 struct printf_spec s 1033 struct printf_spec spec, const char *fmt)
1241 { 1034 {
1242 int nr_bits = max_t(int, spec.field_w 1035 int nr_bits = max_t(int, spec.field_width, 0);
>> 1036 /* current bit is 'cur', most recently seen range is [rbot, rtop] */
>> 1037 int cur, rbot, rtop;
1243 bool first = true; 1038 bool first = true;
1244 int rbot, rtop; <<
1245 1039
1246 if (check_pointer(&buf, end, bitmap, !! 1040 rbot = cur = find_first_bit(bitmap, nr_bits);
1247 return buf; !! 1041 while (cur < nr_bits) {
>> 1042 rtop = cur;
>> 1043 cur = find_next_bit(bitmap, nr_bits, cur + 1);
>> 1044 if (cur < nr_bits && cur <= rtop + 1)
>> 1045 continue;
1248 1046
1249 for_each_set_bitrange(rbot, rtop, bit <<
1250 if (!first) { 1047 if (!first) {
1251 if (buf < end) 1048 if (buf < end)
1252 *buf = ','; 1049 *buf = ',';
1253 buf++; 1050 buf++;
1254 } 1051 }
1255 first = false; 1052 first = false;
1256 1053
1257 buf = number(buf, end, rbot, 1054 buf = number(buf, end, rbot, default_dec_spec);
1258 if (rtop == rbot + 1) !! 1055 if (rbot < rtop) {
1259 continue; !! 1056 if (buf < end)
>> 1057 *buf = '-';
>> 1058 buf++;
1260 1059
1261 if (buf < end) !! 1060 buf = number(buf, end, rtop, default_dec_spec);
1262 *buf = '-'; !! 1061 }
1263 buf = number(++buf, end, rtop !! 1062
>> 1063 rbot = cur;
1264 } 1064 }
1265 return buf; 1065 return buf;
1266 } 1066 }
1267 1067
1268 static noinline_for_stack 1068 static noinline_for_stack
1269 char *mac_address_string(char *buf, char *end 1069 char *mac_address_string(char *buf, char *end, u8 *addr,
1270 struct printf_spec s 1070 struct printf_spec spec, const char *fmt)
1271 { 1071 {
1272 char mac_addr[sizeof("xx:xx:xx:xx:xx: 1072 char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
1273 char *p = mac_addr; 1073 char *p = mac_addr;
1274 int i; 1074 int i;
1275 char separator; 1075 char separator;
1276 bool reversed = false; 1076 bool reversed = false;
1277 1077
1278 if (check_pointer(&buf, end, addr, sp <<
1279 return buf; <<
1280 <<
1281 switch (fmt[1]) { 1078 switch (fmt[1]) {
1282 case 'F': 1079 case 'F':
1283 separator = '-'; 1080 separator = '-';
1284 break; 1081 break;
1285 1082
1286 case 'R': 1083 case 'R':
1287 reversed = true; 1084 reversed = true;
1288 fallthrough; !! 1085 /* fall through */
1289 1086
1290 default: 1087 default:
1291 separator = ':'; 1088 separator = ':';
1292 break; 1089 break;
1293 } 1090 }
1294 1091
1295 for (i = 0; i < 6; i++) { 1092 for (i = 0; i < 6; i++) {
1296 if (reversed) 1093 if (reversed)
1297 p = hex_byte_pack(p, 1094 p = hex_byte_pack(p, addr[5 - i]);
1298 else 1095 else
1299 p = hex_byte_pack(p, 1096 p = hex_byte_pack(p, addr[i]);
1300 1097
1301 if (fmt[0] == 'M' && i != 5) 1098 if (fmt[0] == 'M' && i != 5)
1302 *p++ = separator; 1099 *p++ = separator;
1303 } 1100 }
1304 *p = '\0'; 1101 *p = '\0';
1305 1102
1306 return string_nocheck(buf, end, mac_a !! 1103 return string(buf, end, mac_addr, spec);
1307 } 1104 }
1308 1105
1309 static noinline_for_stack 1106 static noinline_for_stack
1310 char *ip4_string(char *p, const u8 *addr, con 1107 char *ip4_string(char *p, const u8 *addr, const char *fmt)
1311 { 1108 {
1312 int i; 1109 int i;
1313 bool leading_zeros = (fmt[0] == 'i'); 1110 bool leading_zeros = (fmt[0] == 'i');
1314 int index; 1111 int index;
1315 int step; 1112 int step;
1316 1113
1317 switch (fmt[2]) { 1114 switch (fmt[2]) {
1318 case 'h': 1115 case 'h':
1319 #ifdef __BIG_ENDIAN 1116 #ifdef __BIG_ENDIAN
1320 index = 0; 1117 index = 0;
1321 step = 1; 1118 step = 1;
1322 #else 1119 #else
1323 index = 3; 1120 index = 3;
1324 step = -1; 1121 step = -1;
1325 #endif 1122 #endif
1326 break; 1123 break;
1327 case 'l': 1124 case 'l':
1328 index = 3; 1125 index = 3;
1329 step = -1; 1126 step = -1;
1330 break; 1127 break;
1331 case 'n': 1128 case 'n':
1332 case 'b': 1129 case 'b':
1333 default: 1130 default:
1334 index = 0; 1131 index = 0;
1335 step = 1; 1132 step = 1;
1336 break; 1133 break;
1337 } 1134 }
1338 for (i = 0; i < 4; i++) { 1135 for (i = 0; i < 4; i++) {
1339 char temp[4] __aligned(2); 1136 char temp[4] __aligned(2); /* hold each IP quad in reverse order */
1340 int digits = put_dec_trunc8(t 1137 int digits = put_dec_trunc8(temp, addr[index]) - temp;
1341 if (leading_zeros) { 1138 if (leading_zeros) {
1342 if (digits < 3) 1139 if (digits < 3)
1343 *p++ = ''; 1140 *p++ = '';
1344 if (digits < 2) 1141 if (digits < 2)
1345 *p++ = ''; 1142 *p++ = '';
1346 } 1143 }
1347 /* reverse the digits in the 1144 /* reverse the digits in the quad */
1348 while (digits--) 1145 while (digits--)
1349 *p++ = temp[digits]; 1146 *p++ = temp[digits];
1350 if (i < 3) 1147 if (i < 3)
1351 *p++ = '.'; 1148 *p++ = '.';
1352 index += step; 1149 index += step;
1353 } 1150 }
1354 *p = '\0'; 1151 *p = '\0';
1355 1152
1356 return p; 1153 return p;
1357 } 1154 }
1358 1155
1359 static noinline_for_stack 1156 static noinline_for_stack
1360 char *ip6_compressed_string(char *p, const ch 1157 char *ip6_compressed_string(char *p, const char *addr)
1361 { 1158 {
1362 int i, j, range; 1159 int i, j, range;
1363 unsigned char zerolength[8]; 1160 unsigned char zerolength[8];
1364 int longest = 1; 1161 int longest = 1;
1365 int colonpos = -1; 1162 int colonpos = -1;
1366 u16 word; 1163 u16 word;
1367 u8 hi, lo; 1164 u8 hi, lo;
1368 bool needcolon = false; 1165 bool needcolon = false;
1369 bool useIPv4; 1166 bool useIPv4;
1370 struct in6_addr in6; 1167 struct in6_addr in6;
1371 1168
1372 memcpy(&in6, addr, sizeof(struct in6_ 1169 memcpy(&in6, addr, sizeof(struct in6_addr));
1373 1170
1374 useIPv4 = ipv6_addr_v4mapped(&in6) || 1171 useIPv4 = ipv6_addr_v4mapped(&in6) || ipv6_addr_is_isatap(&in6);
1375 1172
1376 memset(zerolength, 0, sizeof(zeroleng 1173 memset(zerolength, 0, sizeof(zerolength));
1377 1174
1378 if (useIPv4) 1175 if (useIPv4)
1379 range = 6; 1176 range = 6;
1380 else 1177 else
1381 range = 8; 1178 range = 8;
1382 1179
1383 /* find position of longest 0 run */ 1180 /* find position of longest 0 run */
1384 for (i = 0; i < range; i++) { 1181 for (i = 0; i < range; i++) {
1385 for (j = i; j < range; j++) { 1182 for (j = i; j < range; j++) {
1386 if (in6.s6_addr16[j] 1183 if (in6.s6_addr16[j] != 0)
1387 break; 1184 break;
1388 zerolength[i]++; 1185 zerolength[i]++;
1389 } 1186 }
1390 } 1187 }
1391 for (i = 0; i < range; i++) { 1188 for (i = 0; i < range; i++) {
1392 if (zerolength[i] > longest) 1189 if (zerolength[i] > longest) {
1393 longest = zerolength[ 1190 longest = zerolength[i];
1394 colonpos = i; 1191 colonpos = i;
1395 } 1192 }
1396 } 1193 }
1397 if (longest == 1) /* do 1194 if (longest == 1) /* don't compress a single 0 */
1398 colonpos = -1; 1195 colonpos = -1;
1399 1196
1400 /* emit address */ 1197 /* emit address */
1401 for (i = 0; i < range; i++) { 1198 for (i = 0; i < range; i++) {
1402 if (i == colonpos) { 1199 if (i == colonpos) {
1403 if (needcolon || i == 1200 if (needcolon || i == 0)
1404 *p++ = ':'; 1201 *p++ = ':';
1405 *p++ = ':'; 1202 *p++ = ':';
1406 needcolon = false; 1203 needcolon = false;
1407 i += longest - 1; 1204 i += longest - 1;
1408 continue; 1205 continue;
1409 } 1206 }
1410 if (needcolon) { 1207 if (needcolon) {
1411 *p++ = ':'; 1208 *p++ = ':';
1412 needcolon = false; 1209 needcolon = false;
1413 } 1210 }
1414 /* hex u16 without leading 0s 1211 /* hex u16 without leading 0s */
1415 word = ntohs(in6.s6_addr16[i] 1212 word = ntohs(in6.s6_addr16[i]);
1416 hi = word >> 8; 1213 hi = word >> 8;
1417 lo = word & 0xff; 1214 lo = word & 0xff;
1418 if (hi) { 1215 if (hi) {
1419 if (hi > 0x0f) 1216 if (hi > 0x0f)
1420 p = hex_byte_ 1217 p = hex_byte_pack(p, hi);
1421 else 1218 else
1422 *p++ = hex_as 1219 *p++ = hex_asc_lo(hi);
1423 p = hex_byte_pack(p, 1220 p = hex_byte_pack(p, lo);
1424 } 1221 }
1425 else if (lo > 0x0f) 1222 else if (lo > 0x0f)
1426 p = hex_byte_pack(p, 1223 p = hex_byte_pack(p, lo);
1427 else 1224 else
1428 *p++ = hex_asc_lo(lo) 1225 *p++ = hex_asc_lo(lo);
1429 needcolon = true; 1226 needcolon = true;
1430 } 1227 }
1431 1228
1432 if (useIPv4) { 1229 if (useIPv4) {
1433 if (needcolon) 1230 if (needcolon)
1434 *p++ = ':'; 1231 *p++ = ':';
1435 p = ip4_string(p, &in6.s6_add 1232 p = ip4_string(p, &in6.s6_addr[12], "I4");
1436 } 1233 }
1437 *p = '\0'; 1234 *p = '\0';
1438 1235
1439 return p; 1236 return p;
1440 } 1237 }
1441 1238
1442 static noinline_for_stack 1239 static noinline_for_stack
1443 char *ip6_string(char *p, const char *addr, c 1240 char *ip6_string(char *p, const char *addr, const char *fmt)
1444 { 1241 {
1445 int i; 1242 int i;
1446 1243
1447 for (i = 0; i < 8; i++) { 1244 for (i = 0; i < 8; i++) {
1448 p = hex_byte_pack(p, *addr++) 1245 p = hex_byte_pack(p, *addr++);
1449 p = hex_byte_pack(p, *addr++) 1246 p = hex_byte_pack(p, *addr++);
1450 if (fmt[0] == 'I' && i != 7) 1247 if (fmt[0] == 'I' && i != 7)
1451 *p++ = ':'; 1248 *p++ = ':';
1452 } 1249 }
1453 *p = '\0'; 1250 *p = '\0';
1454 1251
1455 return p; 1252 return p;
1456 } 1253 }
1457 1254
1458 static noinline_for_stack 1255 static noinline_for_stack
1459 char *ip6_addr_string(char *buf, char *end, c 1256 char *ip6_addr_string(char *buf, char *end, const u8 *addr,
1460 struct printf_spec spec 1257 struct printf_spec spec, const char *fmt)
1461 { 1258 {
1462 char ip6_addr[sizeof("xxxx:xxxx:xxxx: 1259 char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
1463 1260
1464 if (fmt[0] == 'I' && fmt[2] == 'c') 1261 if (fmt[0] == 'I' && fmt[2] == 'c')
1465 ip6_compressed_string(ip6_add 1262 ip6_compressed_string(ip6_addr, addr);
1466 else 1263 else
1467 ip6_string(ip6_addr, addr, fm 1264 ip6_string(ip6_addr, addr, fmt);
1468 1265
1469 return string_nocheck(buf, end, ip6_a !! 1266 return string(buf, end, ip6_addr, spec);
1470 } 1267 }
1471 1268
1472 static noinline_for_stack 1269 static noinline_for_stack
1473 char *ip4_addr_string(char *buf, char *end, c 1270 char *ip4_addr_string(char *buf, char *end, const u8 *addr,
1474 struct printf_spec spec 1271 struct printf_spec spec, const char *fmt)
1475 { 1272 {
1476 char ip4_addr[sizeof("255.255.255.255 1273 char ip4_addr[sizeof("255.255.255.255")];
1477 1274
1478 ip4_string(ip4_addr, addr, fmt); 1275 ip4_string(ip4_addr, addr, fmt);
1479 1276
1480 return string_nocheck(buf, end, ip4_a !! 1277 return string(buf, end, ip4_addr, spec);
1481 } 1278 }
1482 1279
1483 static noinline_for_stack 1280 static noinline_for_stack
1484 char *ip6_addr_string_sa(char *buf, char *end 1281 char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
1485 struct printf_spec s 1282 struct printf_spec spec, const char *fmt)
1486 { 1283 {
1487 bool have_p = false, have_s = false, 1284 bool have_p = false, have_s = false, have_f = false, have_c = false;
1488 char ip6_addr[sizeof("[xxxx:xxxx:xxxx 1285 char ip6_addr[sizeof("[xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255]") +
1489 sizeof(":12345") + size 1286 sizeof(":12345") + sizeof("/123456789") +
1490 sizeof("%1234567890")]; 1287 sizeof("%1234567890")];
1491 char *p = ip6_addr, *pend = ip6_addr 1288 char *p = ip6_addr, *pend = ip6_addr + sizeof(ip6_addr);
1492 const u8 *addr = (const u8 *) &sa->si 1289 const u8 *addr = (const u8 *) &sa->sin6_addr;
1493 char fmt6[2] = { fmt[0], '6' }; 1290 char fmt6[2] = { fmt[0], '6' };
1494 u8 off = 0; 1291 u8 off = 0;
1495 1292
1496 fmt++; 1293 fmt++;
1497 while (isalpha(*++fmt)) { 1294 while (isalpha(*++fmt)) {
1498 switch (*fmt) { 1295 switch (*fmt) {
1499 case 'p': 1296 case 'p':
1500 have_p = true; 1297 have_p = true;
1501 break; 1298 break;
1502 case 'f': 1299 case 'f':
1503 have_f = true; 1300 have_f = true;
1504 break; 1301 break;
1505 case 's': 1302 case 's':
1506 have_s = true; 1303 have_s = true;
1507 break; 1304 break;
1508 case 'c': 1305 case 'c':
1509 have_c = true; 1306 have_c = true;
1510 break; 1307 break;
1511 } 1308 }
1512 } 1309 }
1513 1310
1514 if (have_p || have_s || have_f) { 1311 if (have_p || have_s || have_f) {
1515 *p = '['; 1312 *p = '[';
1516 off = 1; 1313 off = 1;
1517 } 1314 }
1518 1315
1519 if (fmt6[0] == 'I' && have_c) 1316 if (fmt6[0] == 'I' && have_c)
1520 p = ip6_compressed_string(ip6 1317 p = ip6_compressed_string(ip6_addr + off, addr);
1521 else 1318 else
1522 p = ip6_string(ip6_addr + off 1319 p = ip6_string(ip6_addr + off, addr, fmt6);
1523 1320
1524 if (have_p || have_s || have_f) 1321 if (have_p || have_s || have_f)
1525 *p++ = ']'; 1322 *p++ = ']';
1526 1323
1527 if (have_p) { 1324 if (have_p) {
1528 *p++ = ':'; 1325 *p++ = ':';
1529 p = number(p, pend, ntohs(sa- 1326 p = number(p, pend, ntohs(sa->sin6_port), spec);
1530 } 1327 }
1531 if (have_f) { 1328 if (have_f) {
1532 *p++ = '/'; 1329 *p++ = '/';
1533 p = number(p, pend, ntohl(sa- 1330 p = number(p, pend, ntohl(sa->sin6_flowinfo &
1534 IPV 1331 IPV6_FLOWINFO_MASK), spec);
1535 } 1332 }
1536 if (have_s) { 1333 if (have_s) {
1537 *p++ = '%'; 1334 *p++ = '%';
1538 p = number(p, pend, sa->sin6_ 1335 p = number(p, pend, sa->sin6_scope_id, spec);
1539 } 1336 }
1540 *p = '\0'; 1337 *p = '\0';
1541 1338
1542 return string_nocheck(buf, end, ip6_a !! 1339 return string(buf, end, ip6_addr, spec);
1543 } 1340 }
1544 1341
1545 static noinline_for_stack 1342 static noinline_for_stack
1546 char *ip4_addr_string_sa(char *buf, char *end 1343 char *ip4_addr_string_sa(char *buf, char *end, const struct sockaddr_in *sa,
1547 struct printf_spec s 1344 struct printf_spec spec, const char *fmt)
1548 { 1345 {
1549 bool have_p = false; 1346 bool have_p = false;
1550 char *p, ip4_addr[sizeof("255.255.255 1347 char *p, ip4_addr[sizeof("255.255.255.255") + sizeof(":12345")];
1551 char *pend = ip4_addr + sizeof(ip4_ad 1348 char *pend = ip4_addr + sizeof(ip4_addr);
1552 const u8 *addr = (const u8 *) &sa->si 1349 const u8 *addr = (const u8 *) &sa->sin_addr.s_addr;
1553 char fmt4[3] = { fmt[0], '4', 0 }; 1350 char fmt4[3] = { fmt[0], '4', 0 };
1554 1351
1555 fmt++; 1352 fmt++;
1556 while (isalpha(*++fmt)) { 1353 while (isalpha(*++fmt)) {
1557 switch (*fmt) { 1354 switch (*fmt) {
1558 case 'p': 1355 case 'p':
1559 have_p = true; 1356 have_p = true;
1560 break; 1357 break;
1561 case 'h': 1358 case 'h':
1562 case 'l': 1359 case 'l':
1563 case 'n': 1360 case 'n':
1564 case 'b': 1361 case 'b':
1565 fmt4[2] = *fmt; 1362 fmt4[2] = *fmt;
1566 break; 1363 break;
1567 } 1364 }
1568 } 1365 }
1569 1366
1570 p = ip4_string(ip4_addr, addr, fmt4); 1367 p = ip4_string(ip4_addr, addr, fmt4);
1571 if (have_p) { 1368 if (have_p) {
1572 *p++ = ':'; 1369 *p++ = ':';
1573 p = number(p, pend, ntohs(sa- 1370 p = number(p, pend, ntohs(sa->sin_port), spec);
1574 } 1371 }
1575 *p = '\0'; 1372 *p = '\0';
1576 1373
1577 return string_nocheck(buf, end, ip4_a !! 1374 return string(buf, end, ip4_addr, spec);
1578 } <<
1579 <<
1580 static noinline_for_stack <<
1581 char *ip_addr_string(char *buf, char *end, co <<
1582 struct printf_spec spec, <<
1583 { <<
1584 char *err_fmt_msg; <<
1585 <<
1586 if (check_pointer(&buf, end, ptr, spe <<
1587 return buf; <<
1588 <<
1589 switch (fmt[1]) { <<
1590 case '6': <<
1591 return ip6_addr_string(buf, e <<
1592 case '4': <<
1593 return ip4_addr_string(buf, e <<
1594 case 'S': { <<
1595 const union { <<
1596 struct sockaddr <<
1597 struct sockaddr_in <<
1598 struct sockaddr_in6 <<
1599 } *sa = ptr; <<
1600 <<
1601 switch (sa->raw.sa_family) { <<
1602 case AF_INET: <<
1603 return ip4_addr_strin <<
1604 case AF_INET6: <<
1605 return ip6_addr_strin <<
1606 default: <<
1607 return error_string(b <<
1608 }} <<
1609 } <<
1610 <<
1611 err_fmt_msg = fmt[0] == 'i' ? "(%pi?) <<
1612 return error_string(buf, end, err_fmt <<
1613 } 1375 }
1614 1376
1615 static noinline_for_stack 1377 static noinline_for_stack
1616 char *escaped_string(char *buf, char *end, u8 1378 char *escaped_string(char *buf, char *end, u8 *addr, struct printf_spec spec,
1617 const char *fmt) 1379 const char *fmt)
1618 { 1380 {
1619 bool found = true; 1381 bool found = true;
1620 int count = 1; 1382 int count = 1;
1621 unsigned int flags = 0; 1383 unsigned int flags = 0;
1622 int len; 1384 int len;
1623 1385
1624 if (spec.field_width == 0) 1386 if (spec.field_width == 0)
1625 return buf; 1387 return buf; /* nothing to print */
1626 1388
1627 if (check_pointer(&buf, end, addr, sp !! 1389 if (ZERO_OR_NULL_PTR(addr))
1628 return buf; !! 1390 return string(buf, end, NULL, spec); /* NULL pointer */
>> 1391
1629 1392
1630 do { 1393 do {
1631 switch (fmt[count++]) { 1394 switch (fmt[count++]) {
1632 case 'a': 1395 case 'a':
1633 flags |= ESCAPE_ANY; 1396 flags |= ESCAPE_ANY;
1634 break; 1397 break;
1635 case 'c': 1398 case 'c':
1636 flags |= ESCAPE_SPECI 1399 flags |= ESCAPE_SPECIAL;
1637 break; 1400 break;
1638 case 'h': 1401 case 'h':
1639 flags |= ESCAPE_HEX; 1402 flags |= ESCAPE_HEX;
1640 break; 1403 break;
1641 case 'n': 1404 case 'n':
1642 flags |= ESCAPE_NULL; 1405 flags |= ESCAPE_NULL;
1643 break; 1406 break;
1644 case 'o': 1407 case 'o':
1645 flags |= ESCAPE_OCTAL 1408 flags |= ESCAPE_OCTAL;
1646 break; 1409 break;
1647 case 'p': 1410 case 'p':
1648 flags |= ESCAPE_NP; 1411 flags |= ESCAPE_NP;
1649 break; 1412 break;
1650 case 's': 1413 case 's':
1651 flags |= ESCAPE_SPACE 1414 flags |= ESCAPE_SPACE;
1652 break; 1415 break;
1653 default: 1416 default:
1654 found = false; 1417 found = false;
1655 break; 1418 break;
1656 } 1419 }
1657 } while (found); 1420 } while (found);
1658 1421
1659 if (!flags) 1422 if (!flags)
1660 flags = ESCAPE_ANY_NP; 1423 flags = ESCAPE_ANY_NP;
1661 1424
1662 len = spec.field_width < 0 ? 1 : spec 1425 len = spec.field_width < 0 ? 1 : spec.field_width;
1663 1426
1664 /* 1427 /*
1665 * string_escape_mem() writes as many 1428 * string_escape_mem() writes as many characters as it can to
1666 * the given buffer, and returns the 1429 * the given buffer, and returns the total size of the output
1667 * had the buffer been big enough. 1430 * had the buffer been big enough.
1668 */ 1431 */
1669 buf += string_escape_mem(addr, len, b 1432 buf += string_escape_mem(addr, len, buf, buf < end ? end - buf : 0, flags, NULL);
1670 1433
1671 return buf; 1434 return buf;
1672 } 1435 }
1673 1436
1674 static char *va_format(char *buf, char *end, <<
1675 struct printf_spec spe <<
1676 { <<
1677 va_list va; <<
1678 <<
1679 if (check_pointer(&buf, end, va_fmt, <<
1680 return buf; <<
1681 <<
1682 va_copy(va, *va_fmt->va); <<
1683 buf += vsnprintf(buf, end > buf ? end <<
1684 va_end(va); <<
1685 <<
1686 return buf; <<
1687 } <<
1688 <<
1689 static noinline_for_stack 1437 static noinline_for_stack
1690 char *uuid_string(char *buf, char *end, const 1438 char *uuid_string(char *buf, char *end, const u8 *addr,
1691 struct printf_spec spec, co 1439 struct printf_spec spec, const char *fmt)
1692 { 1440 {
1693 char uuid[UUID_STRING_LEN + 1]; 1441 char uuid[UUID_STRING_LEN + 1];
1694 char *p = uuid; 1442 char *p = uuid;
1695 int i; 1443 int i;
1696 const u8 *index = uuid_index; 1444 const u8 *index = uuid_index;
1697 bool uc = false; 1445 bool uc = false;
1698 1446
1699 if (check_pointer(&buf, end, addr, sp <<
1700 return buf; <<
1701 <<
1702 switch (*(++fmt)) { 1447 switch (*(++fmt)) {
1703 case 'L': 1448 case 'L':
1704 uc = true; !! 1449 uc = true; /* fall-through */
1705 fallthrough; <<
1706 case 'l': 1450 case 'l':
1707 index = guid_index; 1451 index = guid_index;
1708 break; 1452 break;
1709 case 'B': 1453 case 'B':
1710 uc = true; 1454 uc = true;
1711 break; 1455 break;
1712 } 1456 }
1713 1457
1714 for (i = 0; i < 16; i++) { 1458 for (i = 0; i < 16; i++) {
1715 if (uc) 1459 if (uc)
1716 p = hex_byte_pack_upp 1460 p = hex_byte_pack_upper(p, addr[index[i]]);
1717 else 1461 else
1718 p = hex_byte_pack(p, 1462 p = hex_byte_pack(p, addr[index[i]]);
1719 switch (i) { 1463 switch (i) {
1720 case 3: 1464 case 3:
1721 case 5: 1465 case 5:
1722 case 7: 1466 case 7:
1723 case 9: 1467 case 9:
1724 *p++ = '-'; 1468 *p++ = '-';
1725 break; 1469 break;
1726 } 1470 }
1727 } 1471 }
1728 1472
1729 *p = 0; 1473 *p = 0;
1730 1474
1731 return string_nocheck(buf, end, uuid, !! 1475 return string(buf, end, uuid, spec);
>> 1476 }
>> 1477
>> 1478 int kptr_restrict __read_mostly;
>> 1479
>> 1480 static noinline_for_stack
>> 1481 char *restricted_pointer(char *buf, char *end, const void *ptr,
>> 1482 struct printf_spec spec)
>> 1483 {
>> 1484 switch (kptr_restrict) {
>> 1485 case 0:
>> 1486 /* Always print %pK values */
>> 1487 break;
>> 1488 case 1: {
>> 1489 const struct cred *cred;
>> 1490
>> 1491 /*
>> 1492 * kptr_restrict==1 cannot be used in IRQ context
>> 1493 * because its test for CAP_SYSLOG would be meaningless.
>> 1494 */
>> 1495 if (in_irq() || in_serving_softirq() || in_nmi()) {
>> 1496 if (spec.field_width == -1)
>> 1497 spec.field_width = 2 * sizeof(ptr);
>> 1498 return string(buf, end, "pK-error", spec);
>> 1499 }
>> 1500
>> 1501 /*
>> 1502 * Only print the real pointer value if the current
>> 1503 * process has CAP_SYSLOG and is running with the
>> 1504 * same credentials it started with. This is because
>> 1505 * access to files is checked at open() time, but %pK
>> 1506 * checks permission at read() time. We don't want to
>> 1507 * leak pointer values if a binary opens a file using
>> 1508 * %pK and then elevates privileges before reading it.
>> 1509 */
>> 1510 cred = current_cred();
>> 1511 if (!has_capability_noaudit(current, CAP_SYSLOG) ||
>> 1512 !uid_eq(cred->euid, cred->uid) ||
>> 1513 !gid_eq(cred->egid, cred->gid))
>> 1514 ptr = NULL;
>> 1515 break;
>> 1516 }
>> 1517 case 2:
>> 1518 default:
>> 1519 /* Always print 0's for %pK */
>> 1520 ptr = NULL;
>> 1521 break;
>> 1522 }
>> 1523
>> 1524 return pointer_string(buf, end, ptr, spec);
1732 } 1525 }
1733 1526
1734 static noinline_for_stack 1527 static noinline_for_stack
1735 char *netdev_bits(char *buf, char *end, const 1528 char *netdev_bits(char *buf, char *end, const void *addr,
1736 struct printf_spec spec, c 1529 struct printf_spec spec, const char *fmt)
1737 { 1530 {
1738 unsigned long long num; 1531 unsigned long long num;
1739 int size; 1532 int size;
1740 1533
1741 if (check_pointer(&buf, end, addr, sp <<
1742 return buf; <<
1743 <<
1744 switch (fmt[1]) { 1534 switch (fmt[1]) {
1745 case 'F': 1535 case 'F':
1746 num = *(const netdev_features 1536 num = *(const netdev_features_t *)addr;
1747 size = sizeof(netdev_features 1537 size = sizeof(netdev_features_t);
1748 break; 1538 break;
1749 default: 1539 default:
1750 return error_string(buf, end, !! 1540 return ptr_to_id(buf, end, addr, spec);
1751 } 1541 }
1752 1542
1753 return special_hex_number(buf, end, n 1543 return special_hex_number(buf, end, num, size);
1754 } 1544 }
1755 1545
1756 static noinline_for_stack 1546 static noinline_for_stack
1757 char *fourcc_string(char *buf, char *end, con !! 1547 char *address_val(char *buf, char *end, const void *addr, const char *fmt)
1758 struct printf_spec spec, <<
1759 { <<
1760 char output[sizeof("0123 little-endia <<
1761 char *p = output; <<
1762 unsigned int i; <<
1763 u32 orig, val; <<
1764 <<
1765 if (fmt[1] != 'c' || fmt[2] != 'c') <<
1766 return error_string(buf, end, <<
1767 <<
1768 if (check_pointer(&buf, end, fourcc, <<
1769 return buf; <<
1770 <<
1771 orig = get_unaligned(fourcc); <<
1772 val = orig & ~BIT(31); <<
1773 <<
1774 for (i = 0; i < sizeof(u32); i++) { <<
1775 unsigned char c = val >> (i * <<
1776 <<
1777 /* Print non-control ASCII ch <<
1778 *p++ = isascii(c) && isprint( <<
1779 } <<
1780 <<
1781 *p++ = ' '; <<
1782 strcpy(p, orig & BIT(31) ? "big-endia <<
1783 p += strlen(p); <<
1784 <<
1785 *p++ = ' '; <<
1786 *p++ = '('; <<
1787 p = special_hex_number(p, output + si <<
1788 *p++ = ')'; <<
1789 *p = '\0'; <<
1790 <<
1791 return string(buf, end, output, spec) <<
1792 } <<
1793 <<
1794 static noinline_for_stack <<
1795 char *address_val(char *buf, char *end, const <<
1796 struct printf_spec spec, co <<
1797 { 1548 {
1798 unsigned long long num; 1549 unsigned long long num;
1799 int size; 1550 int size;
1800 1551
1801 if (check_pointer(&buf, end, addr, sp <<
1802 return buf; <<
1803 <<
1804 switch (fmt[1]) { 1552 switch (fmt[1]) {
1805 case 'd': 1553 case 'd':
1806 num = *(const dma_addr_t *)ad 1554 num = *(const dma_addr_t *)addr;
1807 size = sizeof(dma_addr_t); 1555 size = sizeof(dma_addr_t);
1808 break; 1556 break;
1809 case 'p': 1557 case 'p':
1810 default: 1558 default:
1811 num = *(const phys_addr_t *)a 1559 num = *(const phys_addr_t *)addr;
1812 size = sizeof(phys_addr_t); 1560 size = sizeof(phys_addr_t);
1813 break; 1561 break;
1814 } 1562 }
1815 1563
1816 return special_hex_number(buf, end, n 1564 return special_hex_number(buf, end, num, size);
1817 } 1565 }
1818 1566
1819 static noinline_for_stack 1567 static noinline_for_stack
1820 char *date_str(char *buf, char *end, const st 1568 char *date_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1821 { 1569 {
1822 int year = tm->tm_year + (r ? 0 : 190 1570 int year = tm->tm_year + (r ? 0 : 1900);
1823 int mon = tm->tm_mon + (r ? 0 : 1); 1571 int mon = tm->tm_mon + (r ? 0 : 1);
1824 1572
1825 buf = number(buf, end, year, default_ 1573 buf = number(buf, end, year, default_dec04_spec);
1826 if (buf < end) 1574 if (buf < end)
1827 *buf = '-'; 1575 *buf = '-';
1828 buf++; 1576 buf++;
1829 1577
1830 buf = number(buf, end, mon, default_d 1578 buf = number(buf, end, mon, default_dec02_spec);
1831 if (buf < end) 1579 if (buf < end)
1832 *buf = '-'; 1580 *buf = '-';
1833 buf++; 1581 buf++;
1834 1582
1835 return number(buf, end, tm->tm_mday, 1583 return number(buf, end, tm->tm_mday, default_dec02_spec);
1836 } 1584 }
1837 1585
1838 static noinline_for_stack 1586 static noinline_for_stack
1839 char *time_str(char *buf, char *end, const st 1587 char *time_str(char *buf, char *end, const struct rtc_time *tm, bool r)
1840 { 1588 {
1841 buf = number(buf, end, tm->tm_hour, d 1589 buf = number(buf, end, tm->tm_hour, default_dec02_spec);
1842 if (buf < end) 1590 if (buf < end)
1843 *buf = ':'; 1591 *buf = ':';
1844 buf++; 1592 buf++;
1845 1593
1846 buf = number(buf, end, tm->tm_min, de 1594 buf = number(buf, end, tm->tm_min, default_dec02_spec);
1847 if (buf < end) 1595 if (buf < end)
1848 *buf = ':'; 1596 *buf = ':';
1849 buf++; 1597 buf++;
1850 1598
1851 return number(buf, end, tm->tm_sec, d 1599 return number(buf, end, tm->tm_sec, default_dec02_spec);
1852 } 1600 }
1853 1601
1854 static noinline_for_stack 1602 static noinline_for_stack
1855 char *rtc_str(char *buf, char *end, const str !! 1603 char *rtc_str(char *buf, char *end, const struct rtc_time *tm, const char *fmt)
1856 struct printf_spec spec, const <<
1857 { 1604 {
1858 bool have_t = true, have_d = true; 1605 bool have_t = true, have_d = true;
1859 bool raw = false, iso8601_separator = !! 1606 bool raw = false;
1860 bool found = true; <<
1861 int count = 2; 1607 int count = 2;
1862 1608
1863 if (check_pointer(&buf, end, tm, spec <<
1864 return buf; <<
1865 <<
1866 switch (fmt[count]) { 1609 switch (fmt[count]) {
1867 case 'd': 1610 case 'd':
1868 have_t = false; 1611 have_t = false;
1869 count++; 1612 count++;
1870 break; 1613 break;
1871 case 't': 1614 case 't':
1872 have_d = false; 1615 have_d = false;
1873 count++; 1616 count++;
1874 break; 1617 break;
1875 } 1618 }
1876 1619
1877 do { !! 1620 raw = fmt[count] == 'r';
1878 switch (fmt[count++]) { <<
1879 case 'r': <<
1880 raw = true; <<
1881 break; <<
1882 case 's': <<
1883 iso8601_separator = f <<
1884 break; <<
1885 default: <<
1886 found = false; <<
1887 break; <<
1888 } <<
1889 } while (found); <<
1890 1621
1891 if (have_d) 1622 if (have_d)
1892 buf = date_str(buf, end, tm, 1623 buf = date_str(buf, end, tm, raw);
1893 if (have_d && have_t) { 1624 if (have_d && have_t) {
>> 1625 /* Respect ISO 8601 */
1894 if (buf < end) 1626 if (buf < end)
1895 *buf = iso8601_separa !! 1627 *buf = 'T';
1896 buf++; 1628 buf++;
1897 } 1629 }
1898 if (have_t) 1630 if (have_t)
1899 buf = time_str(buf, end, tm, 1631 buf = time_str(buf, end, tm, raw);
1900 1632
1901 return buf; 1633 return buf;
1902 } 1634 }
1903 1635
1904 static noinline_for_stack 1636 static noinline_for_stack
1905 char *time64_str(char *buf, char *end, const <<
1906 struct printf_spec spec, con <<
1907 { <<
1908 struct rtc_time rtc_time; <<
1909 struct tm tm; <<
1910 <<
1911 time64_to_tm(time, 0, &tm); <<
1912 <<
1913 rtc_time.tm_sec = tm.tm_sec; <<
1914 rtc_time.tm_min = tm.tm_min; <<
1915 rtc_time.tm_hour = tm.tm_hour; <<
1916 rtc_time.tm_mday = tm.tm_mday; <<
1917 rtc_time.tm_mon = tm.tm_mon; <<
1918 rtc_time.tm_year = tm.tm_year; <<
1919 rtc_time.tm_wday = tm.tm_wday; <<
1920 rtc_time.tm_yday = tm.tm_yday; <<
1921 <<
1922 rtc_time.tm_isdst = 0; <<
1923 <<
1924 return rtc_str(buf, end, &rtc_time, s <<
1925 } <<
1926 <<
1927 static noinline_for_stack <<
1928 char *time_and_date(char *buf, char *end, voi 1637 char *time_and_date(char *buf, char *end, void *ptr, struct printf_spec spec,
1929 const char *fmt) 1638 const char *fmt)
1930 { 1639 {
1931 switch (fmt[1]) { 1640 switch (fmt[1]) {
1932 case 'R': 1641 case 'R':
1933 return rtc_str(buf, end, (con !! 1642 return rtc_str(buf, end, (const struct rtc_time *)ptr, fmt);
1934 case 'T': <<
1935 return time64_str(buf, end, * <<
1936 default: 1643 default:
1937 return error_string(buf, end, !! 1644 return ptr_to_id(buf, end, ptr, spec);
1938 } 1645 }
1939 } 1646 }
1940 1647
1941 static noinline_for_stack 1648 static noinline_for_stack
1942 char *clock(char *buf, char *end, struct clk 1649 char *clock(char *buf, char *end, struct clk *clk, struct printf_spec spec,
1943 const char *fmt) 1650 const char *fmt)
1944 { 1651 {
1945 if (!IS_ENABLED(CONFIG_HAVE_CLK)) !! 1652 if (!IS_ENABLED(CONFIG_HAVE_CLK) || !clk)
1946 return error_string(buf, end, !! 1653 return string(buf, end, NULL, spec);
1947 <<
1948 if (check_pointer(&buf, end, clk, spe <<
1949 return buf; <<
1950 1654
1951 switch (fmt[1]) { 1655 switch (fmt[1]) {
1952 case 'n': 1656 case 'n':
1953 default: 1657 default:
1954 #ifdef CONFIG_COMMON_CLK 1658 #ifdef CONFIG_COMMON_CLK
1955 return string(buf, end, __clk 1659 return string(buf, end, __clk_get_name(clk), spec);
1956 #else 1660 #else
1957 return ptr_to_id(buf, end, cl 1661 return ptr_to_id(buf, end, clk, spec);
1958 #endif 1662 #endif
1959 } 1663 }
1960 } 1664 }
1961 1665
1962 static 1666 static
1963 char *format_flags(char *buf, char *end, unsi 1667 char *format_flags(char *buf, char *end, unsigned long flags,
1964 const 1668 const struct trace_print_flags *names)
1965 { 1669 {
1966 unsigned long mask; 1670 unsigned long mask;
1967 1671
1968 for ( ; flags && names->name; names++ 1672 for ( ; flags && names->name; names++) {
1969 mask = names->mask; 1673 mask = names->mask;
1970 if ((flags & mask) != mask) 1674 if ((flags & mask) != mask)
1971 continue; 1675 continue;
1972 1676
1973 buf = string(buf, end, names- 1677 buf = string(buf, end, names->name, default_str_spec);
1974 1678
1975 flags &= ~mask; 1679 flags &= ~mask;
1976 if (flags) { 1680 if (flags) {
1977 if (buf < end) 1681 if (buf < end)
1978 *buf = '|'; 1682 *buf = '|';
1979 buf++; 1683 buf++;
1980 } 1684 }
1981 } 1685 }
1982 1686
1983 if (flags) 1687 if (flags)
1984 buf = number(buf, end, flags, 1688 buf = number(buf, end, flags, default_flag_spec);
1985 1689
1986 return buf; 1690 return buf;
1987 } 1691 }
1988 1692
1989 struct page_flags_fields { <<
1990 int width; <<
1991 int shift; <<
1992 int mask; <<
1993 const struct printf_spec *spec; <<
1994 const char *name; <<
1995 }; <<
1996 <<
1997 static const struct page_flags_fields pff[] = <<
1998 {SECTIONS_WIDTH, SECTIONS_PGSHIFT, SE <<
1999 &default_dec_spec, "section"}, <<
2000 {NODES_WIDTH, NODES_PGSHIFT, NODES_MA <<
2001 &default_dec_spec, "node"}, <<
2002 {ZONES_WIDTH, ZONES_PGSHIFT, ZONES_MA <<
2003 &default_dec_spec, "zone"}, <<
2004 {LAST_CPUPID_WIDTH, LAST_CPUPID_PGSHI <<
2005 &default_flag_spec, "lastcpupid"}, <<
2006 {KASAN_TAG_WIDTH, KASAN_TAG_PGSHIFT, <<
2007 &default_flag_spec, "kasantag"}, <<
2008 }; <<
2009 <<
2010 static <<
2011 char *format_page_flags(char *buf, char *end, <<
2012 { <<
2013 unsigned long main_flags = flags & PA <<
2014 bool append = false; <<
2015 int i; <<
2016 <<
2017 buf = number(buf, end, flags, default <<
2018 if (buf < end) <<
2019 *buf = '('; <<
2020 buf++; <<
2021 <<
2022 /* Page flags from the main area. */ <<
2023 if (main_flags) { <<
2024 buf = format_flags(buf, end, <<
2025 append = true; <<
2026 } <<
2027 <<
2028 /* Page flags from the fields area */ <<
2029 for (i = 0; i < ARRAY_SIZE(pff); i++) <<
2030 /* Skip undefined fields. */ <<
2031 if (!pff[i].width) <<
2032 continue; <<
2033 <<
2034 /* Format: Flag Name + '=' (e <<
2035 if (append) { <<
2036 if (buf < end) <<
2037 *buf = '|'; <<
2038 buf++; <<
2039 } <<
2040 <<
2041 buf = string(buf, end, pff[i] <<
2042 if (buf < end) <<
2043 *buf = '='; <<
2044 buf++; <<
2045 buf = number(buf, end, (flags <<
2046 *pff[i].spec); <<
2047 <<
2048 append = true; <<
2049 } <<
2050 if (buf < end) <<
2051 *buf = ')'; <<
2052 buf++; <<
2053 <<
2054 return buf; <<
2055 } <<
2056 <<
2057 static <<
2058 char *format_page_type(char *buf, char *end, <<
2059 { <<
2060 buf = number(buf, end, page_type, def <<
2061 <<
2062 if (buf < end) <<
2063 *buf = '('; <<
2064 buf++; <<
2065 <<
2066 if (page_type_has_type(page_type)) <<
2067 buf = format_flags(buf, end, <<
2068 <<
2069 if (buf < end) <<
2070 *buf = ')'; <<
2071 buf++; <<
2072 <<
2073 return buf; <<
2074 } <<
2075 <<
2076 static noinline_for_stack 1693 static noinline_for_stack
2077 char *flags_string(char *buf, char *end, void !! 1694 char *flags_string(char *buf, char *end, void *flags_ptr, const char *fmt)
2078 struct printf_spec spec, c <<
2079 { 1695 {
2080 unsigned long flags; 1696 unsigned long flags;
2081 const struct trace_print_flags *names 1697 const struct trace_print_flags *names;
2082 1698
2083 if (check_pointer(&buf, end, flags_pt <<
2084 return buf; <<
2085 <<
2086 switch (fmt[1]) { 1699 switch (fmt[1]) {
2087 case 'p': 1700 case 'p':
2088 return format_page_flags(buf, !! 1701 flags = *(unsigned long *)flags_ptr;
2089 case 't': !! 1702 /* Remove zone id */
2090 return format_page_type(buf, !! 1703 flags &= (1UL << NR_PAGEFLAGS) - 1;
>> 1704 names = pageflag_names;
>> 1705 break;
2091 case 'v': 1706 case 'v':
2092 flags = *(unsigned long *)fla 1707 flags = *(unsigned long *)flags_ptr;
2093 names = vmaflag_names; 1708 names = vmaflag_names;
2094 break; 1709 break;
2095 case 'g': 1710 case 'g':
2096 flags = (__force unsigned lon !! 1711 flags = *(gfp_t *)flags_ptr;
2097 names = gfpflag_names; 1712 names = gfpflag_names;
2098 break; 1713 break;
2099 default: 1714 default:
2100 return error_string(buf, end, !! 1715 WARN_ONCE(1, "Unsupported flags modifier: %c\n", fmt[1]);
>> 1716 return buf;
2101 } 1717 }
2102 1718
2103 return format_flags(buf, end, flags, 1719 return format_flags(buf, end, flags, names);
2104 } 1720 }
2105 1721
>> 1722 static const char *device_node_name_for_depth(const struct device_node *np, int depth)
>> 1723 {
>> 1724 for ( ; np && depth; depth--)
>> 1725 np = np->parent;
>> 1726
>> 1727 return kbasename(np->full_name);
>> 1728 }
>> 1729
2106 static noinline_for_stack 1730 static noinline_for_stack
2107 char *fwnode_full_name_string(struct fwnode_h !! 1731 char *device_node_gen_full_name(const struct device_node *np, char *buf, char *end)
2108 char *end) <<
2109 { 1732 {
2110 int depth; 1733 int depth;
>> 1734 const struct device_node *parent = np->parent;
2111 1735
2112 /* Loop starting from the root node t !! 1736 /* special case for root node */
2113 for (depth = fwnode_count_parents(fwn !! 1737 if (!parent)
2114 /* !! 1738 return string(buf, end, "/", default_str_spec);
2115 * Only get a reference for o !! 1739
2116 * fwnode refcount may be 0 h !! 1740 for (depth = 0; parent->parent; depth++)
2117 */ !! 1741 parent = parent->parent;
2118 struct fwnode_handle *__fwnod !! 1742
2119 fwnode_get_nth_parent !! 1743 for ( ; depth >= 0; depth--) {
2120 !! 1744 buf = string(buf, end, "/", default_str_spec);
2121 buf = string(buf, end, fwnode !! 1745 buf = string(buf, end, device_node_name_for_depth(np, depth),
2122 default_str_spec <<
2123 buf = string(buf, end, fwnode <<
2124 default_str_spec 1746 default_str_spec);
2125 <<
2126 if (depth) <<
2127 fwnode_handle_put(__f <<
2128 } 1747 }
2129 <<
2130 return buf; 1748 return buf;
2131 } 1749 }
2132 1750
2133 static noinline_for_stack 1751 static noinline_for_stack
2134 char *device_node_string(char *buf, char *end 1752 char *device_node_string(char *buf, char *end, struct device_node *dn,
2135 struct printf_spec s 1753 struct printf_spec spec, const char *fmt)
2136 { 1754 {
2137 char tbuf[sizeof("xxxx") + 1]; 1755 char tbuf[sizeof("xxxx") + 1];
2138 const char *p; 1756 const char *p;
2139 int ret; 1757 int ret;
2140 char *buf_start = buf; 1758 char *buf_start = buf;
2141 struct property *prop; 1759 struct property *prop;
2142 bool has_mult, pass; 1760 bool has_mult, pass;
>> 1761 static const struct printf_spec num_spec = {
>> 1762 .flags = SMALL,
>> 1763 .field_width = -1,
>> 1764 .precision = -1,
>> 1765 .base = 10,
>> 1766 };
2143 1767
2144 struct printf_spec str_spec = spec; 1768 struct printf_spec str_spec = spec;
2145 str_spec.field_width = -1; 1769 str_spec.field_width = -1;
2146 1770
2147 if (fmt[0] != 'F') <<
2148 return error_string(buf, end, <<
2149 <<
2150 if (!IS_ENABLED(CONFIG_OF)) 1771 if (!IS_ENABLED(CONFIG_OF))
2151 return error_string(buf, end, !! 1772 return string(buf, end, "(!OF)", spec);
2152 1773
2153 if (check_pointer(&buf, end, dn, spec !! 1774 if ((unsigned long)dn < PAGE_SIZE)
2154 return buf; !! 1775 return string(buf, end, "(null)", spec);
2155 1776
2156 /* simple case without anything any m 1777 /* simple case without anything any more format specifiers */
2157 fmt++; 1778 fmt++;
2158 if (fmt[0] == '\0' || strcspn(fmt,"fn 1779 if (fmt[0] == '\0' || strcspn(fmt,"fnpPFcC") > 0)
2159 fmt = "f"; 1780 fmt = "f";
2160 1781
2161 for (pass = false; strspn(fmt,"fnpPFc 1782 for (pass = false; strspn(fmt,"fnpPFcC"); fmt++, pass = true) {
2162 int precision; 1783 int precision;
2163 if (pass) { 1784 if (pass) {
2164 if (buf < end) 1785 if (buf < end)
2165 *buf = ':'; 1786 *buf = ':';
2166 buf++; 1787 buf++;
2167 } 1788 }
2168 1789
2169 switch (*fmt) { 1790 switch (*fmt) {
2170 case 'f': /* full_name 1791 case 'f': /* full_name */
2171 buf = fwnode_full_nam !! 1792 buf = device_node_gen_full_name(dn, buf, end);
2172 <<
2173 break; 1793 break;
2174 case 'n': /* name */ 1794 case 'n': /* name */
2175 p = fwnode_get_name(o !! 1795 p = kbasename(of_node_full_name(dn));
2176 precision = str_spec. 1796 precision = str_spec.precision;
2177 str_spec.precision = 1797 str_spec.precision = strchrnul(p, '@') - p;
2178 buf = string(buf, end 1798 buf = string(buf, end, p, str_spec);
2179 str_spec.precision = 1799 str_spec.precision = precision;
2180 break; 1800 break;
2181 case 'p': /* phandle */ 1801 case 'p': /* phandle */
2182 buf = number(buf, end !! 1802 buf = number(buf, end, (unsigned int)dn->phandle, num_spec);
2183 break; 1803 break;
2184 case 'P': /* path-spec 1804 case 'P': /* path-spec */
2185 p = fwnode_get_name(o !! 1805 p = kbasename(of_node_full_name(dn));
2186 if (!p[1]) 1806 if (!p[1])
2187 p = "/"; 1807 p = "/";
2188 buf = string(buf, end 1808 buf = string(buf, end, p, str_spec);
2189 break; 1809 break;
2190 case 'F': /* flags */ 1810 case 'F': /* flags */
2191 tbuf[0] = of_node_che 1811 tbuf[0] = of_node_check_flag(dn, OF_DYNAMIC) ? 'D' : '-';
2192 tbuf[1] = of_node_che 1812 tbuf[1] = of_node_check_flag(dn, OF_DETACHED) ? 'd' : '-';
2193 tbuf[2] = of_node_che 1813 tbuf[2] = of_node_check_flag(dn, OF_POPULATED) ? 'P' : '-';
2194 tbuf[3] = of_node_che 1814 tbuf[3] = of_node_check_flag(dn, OF_POPULATED_BUS) ? 'B' : '-';
2195 tbuf[4] = 0; 1815 tbuf[4] = 0;
2196 buf = string_nocheck( !! 1816 buf = string(buf, end, tbuf, str_spec);
2197 break; 1817 break;
2198 case 'c': /* major comp 1818 case 'c': /* major compatible string */
2199 ret = of_property_rea 1819 ret = of_property_read_string(dn, "compatible", &p);
2200 if (!ret) 1820 if (!ret)
2201 buf = string( 1821 buf = string(buf, end, p, str_spec);
2202 break; 1822 break;
2203 case 'C': /* full compa 1823 case 'C': /* full compatible string */
2204 has_mult = false; 1824 has_mult = false;
2205 of_property_for_each_ 1825 of_property_for_each_string(dn, "compatible", prop, p) {
2206 if (has_mult) 1826 if (has_mult)
2207 buf = !! 1827 buf = string(buf, end, ",", str_spec);
2208 buf = string_ !! 1828 buf = string(buf, end, "\"", str_spec);
2209 buf = string( 1829 buf = string(buf, end, p, str_spec);
2210 buf = string_ !! 1830 buf = string(buf, end, "\"", str_spec);
2211 1831
2212 has_mult = tr 1832 has_mult = true;
2213 } 1833 }
2214 break; 1834 break;
2215 default: 1835 default:
2216 break; 1836 break;
2217 } 1837 }
2218 } 1838 }
2219 1839
2220 return widen_string(buf, buf - buf_st 1840 return widen_string(buf, buf - buf_start, end, spec);
2221 } 1841 }
2222 1842
2223 static noinline_for_stack <<
2224 char *fwnode_string(char *buf, char *end, str <<
2225 struct printf_spec spec, <<
2226 { <<
2227 struct printf_spec str_spec = spec; <<
2228 char *buf_start = buf; <<
2229 <<
2230 str_spec.field_width = -1; <<
2231 <<
2232 if (*fmt != 'w') <<
2233 return error_string(buf, end, <<
2234 <<
2235 if (check_pointer(&buf, end, fwnode, <<
2236 return buf; <<
2237 <<
2238 fmt++; <<
2239 <<
2240 switch (*fmt) { <<
2241 case 'P': /* name */ <<
2242 buf = string(buf, end, fwnode <<
2243 break; <<
2244 case 'f': /* full_name */ <<
2245 default: <<
2246 buf = fwnode_full_name_string <<
2247 break; <<
2248 } <<
2249 <<
2250 return widen_string(buf, buf - buf_st <<
2251 } <<
2252 <<
2253 int __init no_hash_pointers_enable(char *str) <<
2254 { <<
2255 if (no_hash_pointers) <<
2256 return 0; <<
2257 <<
2258 no_hash_pointers = true; <<
2259 <<
2260 pr_warn("**************************** <<
2261 pr_warn("** NOTICE NOTICE NOTICE NO <<
2262 pr_warn("** <<
2263 pr_warn("** This system shows unhashe <<
2264 pr_warn("** via the console, logs, an <<
2265 pr_warn("** might reduce the security <<
2266 pr_warn("** <<
2267 pr_warn("** If you see this message a <<
2268 pr_warn("** the kernel, report this i <<
2269 pr_warn("** administrator! <<
2270 pr_warn("** <<
2271 pr_warn("** NOTICE NOTICE NOTICE NO <<
2272 pr_warn("**************************** <<
2273 <<
2274 return 0; <<
2275 } <<
2276 early_param("no_hash_pointers", no_hash_point <<
2277 <<
2278 /* Used for Rust formatting ('%pA'). */ <<
2279 char *rust_fmt_argument(char *buf, char *end, <<
2280 <<
2281 /* 1843 /*
2282 * Show a '%p' thing. A kernel extension is 1844 * Show a '%p' thing. A kernel extension is that the '%p' is followed
2283 * by an extra set of alphanumeric characters 1845 * by an extra set of alphanumeric characters that are extended format
2284 * specifiers. 1846 * specifiers.
2285 * 1847 *
2286 * Please update scripts/checkpatch.pl when a 1848 * Please update scripts/checkpatch.pl when adding/removing conversion
2287 * characters. (Search for "check for vsprin 1849 * characters. (Search for "check for vsprintf extension").
2288 * 1850 *
2289 * Right now we handle: 1851 * Right now we handle:
2290 * 1852 *
2291 * - 'S' For symbolic direct pointers (or fun 1853 * - 'S' For symbolic direct pointers (or function descriptors) with offset
2292 * - 's' For symbolic direct pointers (or fun 1854 * - 's' For symbolic direct pointers (or function descriptors) without offset
2293 * - '[Ss]R' as above with __builtin_extract_ !! 1855 * - 'F' Same as 'S'
2294 * - 'S[R]b' as above with module build ID (f !! 1856 * - 'f' Same as 's'
2295 * - '[Ff]' %pf and %pF were obsoleted and la !! 1857 * - '[FfSs]R' as above with __builtin_extract_return_addr() translation
2296 * %ps and %pS. Be careful when re-u <<
2297 * - 'B' For backtraced symbolic direct point 1858 * - 'B' For backtraced symbolic direct pointers with offset
2298 * - 'Bb' as above with module build ID (for <<
2299 * - 'R' For decoded struct resource, e.g., [ 1859 * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
2300 * - 'r' For raw struct resource, e.g., [mem 1860 * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]
2301 * - 'b[l]' For a bitmap, the number of bits 1861 * - 'b[l]' For a bitmap, the number of bits is determined by the field
2302 * width which must be explicitly speci 1862 * width which must be explicitly specified either as part of the
2303 * format string '%32b[l]' or through ' 1863 * format string '%32b[l]' or through '%*b[l]', [l] selects
2304 * range-list format instead of hex for 1864 * range-list format instead of hex format
2305 * - 'M' For a 6-byte MAC address, it prints 1865 * - 'M' For a 6-byte MAC address, it prints the address in the
2306 * usual colon-separated hex notation 1866 * usual colon-separated hex notation
2307 * - 'm' For a 6-byte MAC address, it prints 1867 * - 'm' For a 6-byte MAC address, it prints the hex address without colons
2308 * - 'MF' For a 6-byte MAC FDDI address, it p 1868 * - 'MF' For a 6-byte MAC FDDI address, it prints the address
2309 * with a dash-separated hex notation 1869 * with a dash-separated hex notation
2310 * - '[mM]R' For a 6-byte MAC address, Revers 1870 * - '[mM]R' For a 6-byte MAC address, Reverse order (Bluetooth)
2311 * - 'I' [46] for IPv4/IPv6 addresses printed 1871 * - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
2312 * IPv4 uses dot-separated decimal with 1872 * IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
2313 * IPv6 uses colon separated network-or 1873 * IPv6 uses colon separated network-order 16 bit hex with leading 0's
2314 * [S][pfs] 1874 * [S][pfs]
2315 * Generic IPv4/IPv6 address (struct so 1875 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
2316 * [4] or [6] and is able to print port 1876 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
2317 * - 'i' [46] for 'raw' IPv4/IPv6 addresses 1877 * - 'i' [46] for 'raw' IPv4/IPv6 addresses
2318 * IPv6 omits the colons (01020304...0f 1878 * IPv6 omits the colons (01020304...0f)
2319 * IPv4 uses dot-separated decimal with 1879 * IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
2320 * [S][pfs] 1880 * [S][pfs]
2321 * Generic IPv4/IPv6 address (struct so 1881 * Generic IPv4/IPv6 address (struct sockaddr *) that falls back to
2322 * [4] or [6] and is able to print port 1882 * [4] or [6] and is able to print port [p], flowinfo [f], scope [s]
2323 * - '[Ii][4S][hnbl]' IPv4 addresses in host, 1883 * - '[Ii][4S][hnbl]' IPv4 addresses in host, network, big or little endian order
2324 * - 'I[6S]c' for IPv6 addresses printed as s 1884 * - 'I[6S]c' for IPv6 addresses printed as specified by
2325 * https://tools.ietf.org/html/rfc5952 !! 1885 * http://tools.ietf.org/html/rfc5952
2326 * - 'E[achnops]' For an escaped buffer, wher 1886 * - 'E[achnops]' For an escaped buffer, where rules are defined by combination
2327 * of the following flags (see 1887 * of the following flags (see string_escape_mem() for the
2328 * details): 1888 * details):
2329 * a - ESCAPE_ANY 1889 * a - ESCAPE_ANY
2330 * c - ESCAPE_SPECIAL 1890 * c - ESCAPE_SPECIAL
2331 * h - ESCAPE_HEX 1891 * h - ESCAPE_HEX
2332 * n - ESCAPE_NULL 1892 * n - ESCAPE_NULL
2333 * o - ESCAPE_OCTAL 1893 * o - ESCAPE_OCTAL
2334 * p - ESCAPE_NP 1894 * p - ESCAPE_NP
2335 * s - ESCAPE_SPACE 1895 * s - ESCAPE_SPACE
2336 * By default ESCAPE_ANY_NP is 1896 * By default ESCAPE_ANY_NP is used.
2337 * - 'U' For a 16 byte UUID/GUID, it prints t 1897 * - 'U' For a 16 byte UUID/GUID, it prints the UUID/GUID in the form
2338 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxx 1898 * "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
2339 * Options for %pU are: 1899 * Options for %pU are:
2340 * b big endian lower case hex (defau 1900 * b big endian lower case hex (default)
2341 * B big endian UPPER case hex 1901 * B big endian UPPER case hex
2342 * l little endian lower case hex 1902 * l little endian lower case hex
2343 * L little endian UPPER case hex 1903 * L little endian UPPER case hex
2344 * big endian output byte order is: 1904 * big endian output byte order is:
2345 * [0][1][2][3]-[4][5]-[6][7]-[8] 1905 * [0][1][2][3]-[4][5]-[6][7]-[8][9]-[10][11][12][13][14][15]
2346 * little endian output byte order 1906 * little endian output byte order is:
2347 * [3][2][1][0]-[5][4]-[7][6]-[8] 1907 * [3][2][1][0]-[5][4]-[7][6]-[8][9]-[10][11][12][13][14][15]
2348 * - 'V' For a struct va_format which contain 1908 * - 'V' For a struct va_format which contains a format string * and va_list *,
2349 * call vsnprintf(->format, *->va_list) 1909 * call vsnprintf(->format, *->va_list).
2350 * Implements a "recursive vsnprintf". 1910 * Implements a "recursive vsnprintf".
2351 * Do not use this feature without some 1911 * Do not use this feature without some mechanism to verify the
2352 * correctness of the format string and 1912 * correctness of the format string and va_list arguments.
2353 * - 'K' For a kernel pointer that should be !! 1913 * - 'K' For a kernel pointer that should be hidden from unprivileged users
2354 * Use only for procfs, sysfs and simil <<
2355 * read the documentation (path below) <<
2356 * - 'NF' For a netdev_features_t 1914 * - 'NF' For a netdev_features_t
2357 * - '4cc' V4L2 or DRM FourCC code, with endi <<
2358 * - 'h[CDN]' For a variable-length buffer, i 1915 * - 'h[CDN]' For a variable-length buffer, it prints it as a hex string with
2359 * a certain separator (' ' by def 1916 * a certain separator (' ' by default):
2360 * C colon 1917 * C colon
2361 * D dash 1918 * D dash
2362 * N no separator 1919 * N no separator
2363 * The maximum supported length is 1920 * The maximum supported length is 64 bytes of the input. Consider
2364 * to use print_hex_dump() for the 1921 * to use print_hex_dump() for the larger input.
2365 * - 'a[pd]' For address types [p] phys_addr_ 1922 * - 'a[pd]' For address types [p] phys_addr_t, [d] dma_addr_t and derivatives
2366 * (default assumed to be phys_addr 1923 * (default assumed to be phys_addr_t, passed by reference)
2367 * - 'd[234]' For a dentry name (optionally 2 1924 * - 'd[234]' For a dentry name (optionally 2-4 last components)
2368 * - 'D[234]' Same as 'd' but for a struct fi 1925 * - 'D[234]' Same as 'd' but for a struct file
2369 * - 'g' For block_device name (gendisk + par 1926 * - 'g' For block_device name (gendisk + partition number)
2370 * - 't[RT][dt][r][s]' For time and date as r !! 1927 * - 't[R][dt][r]' For time and date as represented:
2371 * R struct rtc_time 1928 * R struct rtc_time
2372 * T time64_t <<
2373 * - 'C' For a clock, it prints the name (Com 1929 * - 'C' For a clock, it prints the name (Common Clock Framework) or address
2374 * (legacy clock framework) of the cloc 1930 * (legacy clock framework) of the clock
2375 * - 'Cn' For a clock, it prints the name (Co 1931 * - 'Cn' For a clock, it prints the name (Common Clock Framework) or address
2376 * (legacy clock framework) of the clo 1932 * (legacy clock framework) of the clock
>> 1933 * - 'Cr' For a clock, it prints the current rate of the clock
2377 * - 'G' For flags to be printed as a collect 1934 * - 'G' For flags to be printed as a collection of symbolic strings that would
2378 * construct the specific value. Suppor 1935 * construct the specific value. Supported flags given by option:
2379 * p page flags (see struct page) given 1936 * p page flags (see struct page) given as pointer to unsigned long
2380 * g gfp flags (GFP_* and __GFP_*) give 1937 * g gfp flags (GFP_* and __GFP_*) given as pointer to gfp_t
2381 * v vma flags (VM_*) given as pointer 1938 * v vma flags (VM_*) given as pointer to unsigned long
2382 * - 'OF[fnpPcCF]' For a device tree object 1939 * - 'OF[fnpPcCF]' For a device tree object
2383 * Without any optional argu 1940 * Without any optional arguments prints the full_name
2384 * f device node full_name 1941 * f device node full_name
2385 * n device node name 1942 * n device node name
2386 * p device node phandle 1943 * p device node phandle
2387 * P device node path spec ( 1944 * P device node path spec (name + @unit)
2388 * F device node flags 1945 * F device node flags
2389 * c major compatible string 1946 * c major compatible string
2390 * C full compatible string 1947 * C full compatible string
2391 * - 'fw[fP]' For a firmware node (struct f !! 1948 * - 'x' For printing the address. Equivalent to "%lx".
2392 * Without an option prints the <<
2393 * f full name <<
2394 * P node name, including a poss <<
2395 * - 'x' For printing the address unmodified. <<
2396 * Please read the documentation (path <<
2397 * - '[ku]s' For a BPF/tracing related format <<
2398 * bpf_trace_printk() where [ku] pr <<
2399 * or user (u) memory to probe, and <<
2400 * s a string, equivalent to "%s <<
2401 * 1949 *
2402 * ** When making changes please also update: 1950 * ** When making changes please also update:
2403 * Documentation/core-api/printk-formats 1951 * Documentation/core-api/printk-formats.rst
2404 * 1952 *
2405 * Note: The default behaviour (unadorned %p) 1953 * Note: The default behaviour (unadorned %p) is to hash the address,
2406 * rendering it useful as a unique identifier 1954 * rendering it useful as a unique identifier.
2407 * <<
2408 * There is also a '%pA' format specifier, bu <<
2409 * from Rust code to format core::fmt::Argume <<
2410 * See rust/kernel/print.rs for details. <<
2411 */ 1955 */
2412 static noinline_for_stack 1956 static noinline_for_stack
2413 char *pointer(const char *fmt, char *buf, cha 1957 char *pointer(const char *fmt, char *buf, char *end, void *ptr,
2414 struct printf_spec spec) 1958 struct printf_spec spec)
2415 { 1959 {
>> 1960 const int default_width = 2 * sizeof(void *);
>> 1961
>> 1962 if (!ptr && *fmt != 'K' && *fmt != 'x') {
>> 1963 /*
>> 1964 * Print (null) with the same width as a pointer so it makes
>> 1965 * tabular output look nice.
>> 1966 */
>> 1967 if (spec.field_width == -1)
>> 1968 spec.field_width = default_width;
>> 1969 return string(buf, end, "(null)", spec);
>> 1970 }
>> 1971
2416 switch (*fmt) { 1972 switch (*fmt) {
>> 1973 case 'F':
>> 1974 case 'f':
2417 case 'S': 1975 case 'S':
2418 case 's': 1976 case 's':
2419 ptr = dereference_symbol_desc 1977 ptr = dereference_symbol_descriptor(ptr);
2420 fallthrough; !! 1978 /* Fallthrough */
2421 case 'B': 1979 case 'B':
2422 return symbol_string(buf, end 1980 return symbol_string(buf, end, ptr, spec, fmt);
2423 case 'R': 1981 case 'R':
2424 case 'r': 1982 case 'r':
2425 return resource_string(buf, e 1983 return resource_string(buf, end, ptr, spec, fmt);
2426 case 'h': 1984 case 'h':
2427 return hex_string(buf, end, p 1985 return hex_string(buf, end, ptr, spec, fmt);
2428 case 'b': 1986 case 'b':
2429 switch (fmt[1]) { 1987 switch (fmt[1]) {
2430 case 'l': 1988 case 'l':
2431 return bitmap_list_st 1989 return bitmap_list_string(buf, end, ptr, spec, fmt);
2432 default: 1990 default:
2433 return bitmap_string( 1991 return bitmap_string(buf, end, ptr, spec, fmt);
2434 } 1992 }
2435 case 'M': /* Co 1993 case 'M': /* Colon separated: 00:01:02:03:04:05 */
2436 case 'm': /* Co 1994 case 'm': /* Contiguous: 000102030405 */
2437 /* [m 1995 /* [mM]F (FDDI) */
2438 /* [m 1996 /* [mM]R (Reverse order; Bluetooth) */
2439 return mac_address_string(buf 1997 return mac_address_string(buf, end, ptr, spec, fmt);
2440 case 'I': /* Fo 1998 case 'I': /* Formatted IP supported
2441 * 4: 1999 * 4: 1.2.3.4
2442 * 6: 2000 * 6: 0001:0203:...:0708
2443 * 6c 2001 * 6c: 1::708 or 1::1.2.3.4
2444 */ 2002 */
2445 case 'i': /* Co 2003 case 'i': /* Contiguous:
2446 * 4: 2004 * 4: 001.002.003.004
2447 * 6: 2005 * 6: 000102...0f
2448 */ 2006 */
2449 return ip_addr_string(buf, en !! 2007 switch (fmt[1]) {
>> 2008 case '6':
>> 2009 return ip6_addr_string(buf, end, ptr, spec, fmt);
>> 2010 case '4':
>> 2011 return ip4_addr_string(buf, end, ptr, spec, fmt);
>> 2012 case 'S': {
>> 2013 const union {
>> 2014 struct sockaddr raw;
>> 2015 struct sockaddr_in v4;
>> 2016 struct sockaddr_in6 v6;
>> 2017 } *sa = ptr;
>> 2018
>> 2019 switch (sa->raw.sa_family) {
>> 2020 case AF_INET:
>> 2021 return ip4_addr_string_sa(buf, end, &sa->v4, spec, fmt);
>> 2022 case AF_INET6:
>> 2023 return ip6_addr_string_sa(buf, end, &sa->v6, spec, fmt);
>> 2024 default:
>> 2025 return string(buf, end, "(invalid address)", spec);
>> 2026 }}
>> 2027 }
>> 2028 break;
2450 case 'E': 2029 case 'E':
2451 return escaped_string(buf, en 2030 return escaped_string(buf, end, ptr, spec, fmt);
2452 case 'U': 2031 case 'U':
2453 return uuid_string(buf, end, 2032 return uuid_string(buf, end, ptr, spec, fmt);
2454 case 'V': 2033 case 'V':
2455 return va_format(buf, end, pt !! 2034 {
>> 2035 va_list va;
>> 2036
>> 2037 va_copy(va, *((struct va_format *)ptr)->va);
>> 2038 buf += vsnprintf(buf, end > buf ? end - buf : 0,
>> 2039 ((struct va_format *)ptr)->fmt, va);
>> 2040 va_end(va);
>> 2041 return buf;
>> 2042 }
2456 case 'K': 2043 case 'K':
>> 2044 if (!kptr_restrict)
>> 2045 break;
2457 return restricted_pointer(buf 2046 return restricted_pointer(buf, end, ptr, spec);
2458 case 'N': 2047 case 'N':
2459 return netdev_bits(buf, end, 2048 return netdev_bits(buf, end, ptr, spec, fmt);
2460 case '4': <<
2461 return fourcc_string(buf, end <<
2462 case 'a': 2049 case 'a':
2463 return address_val(buf, end, !! 2050 return address_val(buf, end, ptr, fmt);
2464 case 'd': 2051 case 'd':
2465 return dentry_name(buf, end, 2052 return dentry_name(buf, end, ptr, spec, fmt);
2466 case 't': 2053 case 't':
2467 return time_and_date(buf, end 2054 return time_and_date(buf, end, ptr, spec, fmt);
2468 case 'C': 2055 case 'C':
2469 return clock(buf, end, ptr, s 2056 return clock(buf, end, ptr, spec, fmt);
2470 case 'D': 2057 case 'D':
2471 return file_dentry_name(buf, !! 2058 return dentry_name(buf, end,
>> 2059 ((const struct file *)ptr)->f_path.dentry,
>> 2060 spec, fmt);
2472 #ifdef CONFIG_BLOCK 2061 #ifdef CONFIG_BLOCK
2473 case 'g': 2062 case 'g':
2474 return bdev_name(buf, end, pt 2063 return bdev_name(buf, end, ptr, spec, fmt);
2475 #endif 2064 #endif
2476 2065
2477 case 'G': 2066 case 'G':
2478 return flags_string(buf, end, !! 2067 return flags_string(buf, end, ptr, fmt);
2479 case 'O': 2068 case 'O':
2480 return device_node_string(buf !! 2069 switch (fmt[1]) {
2481 case 'f': !! 2070 case 'F':
2482 return fwnode_string(buf, end !! 2071 return device_node_string(buf, end, ptr, spec, fmt + 1);
2483 case 'A': <<
2484 if (!IS_ENABLED(CONFIG_RUST)) <<
2485 WARN_ONCE(1, "Please <<
2486 return error_string(b <<
2487 } 2072 }
2488 return rust_fmt_argument(buf, !! 2073 break;
2489 case 'x': 2074 case 'x':
2490 return pointer_string(buf, en 2075 return pointer_string(buf, end, ptr, spec);
2491 case 'e': <<
2492 /* %pe with a non-ERR_PTR get <<
2493 if (!IS_ERR(ptr)) <<
2494 return default_pointe <<
2495 return err_ptr(buf, end, ptr, <<
2496 case 'u': <<
2497 case 'k': <<
2498 switch (fmt[1]) { <<
2499 case 's': <<
2500 return string(buf, en <<
2501 default: <<
2502 return error_string(b <<
2503 } <<
2504 default: <<
2505 return default_pointer(buf, e <<
2506 } 2076 }
>> 2077
>> 2078 /* default is to _not_ leak addresses, hash before printing */
>> 2079 return ptr_to_id(buf, end, ptr, spec);
2507 } 2080 }
2508 2081
2509 /* 2082 /*
2510 * Helper function to decode printf style for 2083 * Helper function to decode printf style format.
2511 * Each call decode a token from the format a 2084 * Each call decode a token from the format and return the
2512 * number of characters read (or likely the d 2085 * number of characters read (or likely the delta where it wants
2513 * to go on the next call). 2086 * to go on the next call).
2514 * The decoded token is returned through the 2087 * The decoded token is returned through the parameters
2515 * 2088 *
2516 * 'h', 'l', or 'L' for integer fields 2089 * 'h', 'l', or 'L' for integer fields
2517 * 'z' support added 23/7/1999 S.H. 2090 * 'z' support added 23/7/1999 S.H.
2518 * 'z' changed to 'Z' --davidm 1/25/99 2091 * 'z' changed to 'Z' --davidm 1/25/99
2519 * 'Z' changed to 'z' --adobriyan 2017-01-25 2092 * 'Z' changed to 'z' --adobriyan 2017-01-25
2520 * 't' added for ptrdiff_t 2093 * 't' added for ptrdiff_t
2521 * 2094 *
2522 * @fmt: the format string 2095 * @fmt: the format string
2523 * @type of the token returned 2096 * @type of the token returned
2524 * @flags: various flags such as +, -, # toke 2097 * @flags: various flags such as +, -, # tokens..
2525 * @field_width: overwritten width 2098 * @field_width: overwritten width
2526 * @base: base of the number (octal, hex, ... 2099 * @base: base of the number (octal, hex, ...)
2527 * @precision: precision of a number 2100 * @precision: precision of a number
2528 * @qualifier: qualifier of a number (long, s 2101 * @qualifier: qualifier of a number (long, size_t, ...)
2529 */ 2102 */
2530 static noinline_for_stack 2103 static noinline_for_stack
2531 int format_decode(const char *fmt, struct pri 2104 int format_decode(const char *fmt, struct printf_spec *spec)
2532 { 2105 {
2533 const char *start = fmt; 2106 const char *start = fmt;
2534 char qualifier; 2107 char qualifier;
2535 2108
2536 /* we finished early by reading the f 2109 /* we finished early by reading the field width */
2537 if (spec->type == FORMAT_TYPE_WIDTH) 2110 if (spec->type == FORMAT_TYPE_WIDTH) {
2538 if (spec->field_width < 0) { 2111 if (spec->field_width < 0) {
2539 spec->field_width = - 2112 spec->field_width = -spec->field_width;
2540 spec->flags |= LEFT; 2113 spec->flags |= LEFT;
2541 } 2114 }
2542 spec->type = FORMAT_TYPE_NONE 2115 spec->type = FORMAT_TYPE_NONE;
2543 goto precision; 2116 goto precision;
2544 } 2117 }
2545 2118
2546 /* we finished early by reading the p 2119 /* we finished early by reading the precision */
2547 if (spec->type == FORMAT_TYPE_PRECISI 2120 if (spec->type == FORMAT_TYPE_PRECISION) {
2548 if (spec->precision < 0) 2121 if (spec->precision < 0)
2549 spec->precision = 0; 2122 spec->precision = 0;
2550 2123
2551 spec->type = FORMAT_TYPE_NONE 2124 spec->type = FORMAT_TYPE_NONE;
2552 goto qualifier; 2125 goto qualifier;
2553 } 2126 }
2554 2127
2555 /* By default */ 2128 /* By default */
2556 spec->type = FORMAT_TYPE_NONE; 2129 spec->type = FORMAT_TYPE_NONE;
2557 2130
2558 for (; *fmt ; ++fmt) { 2131 for (; *fmt ; ++fmt) {
2559 if (*fmt == '%') 2132 if (*fmt == '%')
2560 break; 2133 break;
2561 } 2134 }
2562 2135
2563 /* Return the current non-format stri 2136 /* Return the current non-format string */
2564 if (fmt != start || !*fmt) 2137 if (fmt != start || !*fmt)
2565 return fmt - start; 2138 return fmt - start;
2566 2139
2567 /* Process flags */ 2140 /* Process flags */
2568 spec->flags = 0; 2141 spec->flags = 0;
2569 2142
2570 while (1) { /* this also skips first 2143 while (1) { /* this also skips first '%' */
2571 bool found = true; 2144 bool found = true;
2572 2145
2573 ++fmt; 2146 ++fmt;
2574 2147
2575 switch (*fmt) { 2148 switch (*fmt) {
2576 case '-': spec->flags |= LEFT 2149 case '-': spec->flags |= LEFT; break;
2577 case '+': spec->flags |= PLUS 2150 case '+': spec->flags |= PLUS; break;
2578 case ' ': spec->flags |= SPAC 2151 case ' ': spec->flags |= SPACE; break;
2579 case '#': spec->flags |= SPEC 2152 case '#': spec->flags |= SPECIAL; break;
2580 case '': spec->flags |= ZEROP 2153 case '': spec->flags |= ZEROPAD; break;
2581 default: found = false; 2154 default: found = false;
2582 } 2155 }
2583 2156
2584 if (!found) 2157 if (!found)
2585 break; 2158 break;
2586 } 2159 }
2587 2160
2588 /* get field width */ 2161 /* get field width */
2589 spec->field_width = -1; 2162 spec->field_width = -1;
2590 2163
2591 if (isdigit(*fmt)) 2164 if (isdigit(*fmt))
2592 spec->field_width = skip_atoi 2165 spec->field_width = skip_atoi(&fmt);
2593 else if (*fmt == '*') { 2166 else if (*fmt == '*') {
2594 /* it's the next argument */ 2167 /* it's the next argument */
2595 spec->type = FORMAT_TYPE_WIDT 2168 spec->type = FORMAT_TYPE_WIDTH;
2596 return ++fmt - start; 2169 return ++fmt - start;
2597 } 2170 }
2598 2171
2599 precision: 2172 precision:
2600 /* get the precision */ 2173 /* get the precision */
2601 spec->precision = -1; 2174 spec->precision = -1;
2602 if (*fmt == '.') { 2175 if (*fmt == '.') {
2603 ++fmt; 2176 ++fmt;
2604 if (isdigit(*fmt)) { 2177 if (isdigit(*fmt)) {
2605 spec->precision = ski 2178 spec->precision = skip_atoi(&fmt);
2606 if (spec->precision < 2179 if (spec->precision < 0)
2607 spec->precisi 2180 spec->precision = 0;
2608 } else if (*fmt == '*') { 2181 } else if (*fmt == '*') {
2609 /* it's the next argu 2182 /* it's the next argument */
2610 spec->type = FORMAT_T 2183 spec->type = FORMAT_TYPE_PRECISION;
2611 return ++fmt - start; 2184 return ++fmt - start;
2612 } 2185 }
2613 } 2186 }
2614 2187
2615 qualifier: 2188 qualifier:
2616 /* get the conversion qualifier */ 2189 /* get the conversion qualifier */
2617 qualifier = 0; 2190 qualifier = 0;
2618 if (*fmt == 'h' || _tolower(*fmt) == 2191 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
2619 *fmt == 'z' || *fmt == 't') { 2192 *fmt == 'z' || *fmt == 't') {
2620 qualifier = *fmt++; 2193 qualifier = *fmt++;
2621 if (unlikely(qualifier == *fm 2194 if (unlikely(qualifier == *fmt)) {
2622 if (qualifier == 'l') 2195 if (qualifier == 'l') {
2623 qualifier = ' 2196 qualifier = 'L';
2624 ++fmt; 2197 ++fmt;
2625 } else if (qualifier 2198 } else if (qualifier == 'h') {
2626 qualifier = ' 2199 qualifier = 'H';
2627 ++fmt; 2200 ++fmt;
2628 } 2201 }
2629 } 2202 }
2630 } 2203 }
2631 2204
2632 /* default base */ 2205 /* default base */
2633 spec->base = 10; 2206 spec->base = 10;
2634 switch (*fmt) { 2207 switch (*fmt) {
2635 case 'c': 2208 case 'c':
2636 spec->type = FORMAT_TYPE_CHAR 2209 spec->type = FORMAT_TYPE_CHAR;
2637 return ++fmt - start; 2210 return ++fmt - start;
2638 2211
2639 case 's': 2212 case 's':
2640 spec->type = FORMAT_TYPE_STR; 2213 spec->type = FORMAT_TYPE_STR;
2641 return ++fmt - start; 2214 return ++fmt - start;
2642 2215
2643 case 'p': 2216 case 'p':
2644 spec->type = FORMAT_TYPE_PTR; 2217 spec->type = FORMAT_TYPE_PTR;
2645 return ++fmt - start; 2218 return ++fmt - start;
2646 2219
2647 case '%': 2220 case '%':
2648 spec->type = FORMAT_TYPE_PERC 2221 spec->type = FORMAT_TYPE_PERCENT_CHAR;
2649 return ++fmt - start; 2222 return ++fmt - start;
2650 2223
2651 /* integer number formats - set up th 2224 /* integer number formats - set up the flags and "break" */
2652 case 'o': 2225 case 'o':
2653 spec->base = 8; 2226 spec->base = 8;
2654 break; 2227 break;
2655 2228
2656 case 'x': 2229 case 'x':
2657 spec->flags |= SMALL; 2230 spec->flags |= SMALL;
2658 fallthrough; !! 2231 /* fall through */
2659 2232
2660 case 'X': 2233 case 'X':
2661 spec->base = 16; 2234 spec->base = 16;
2662 break; 2235 break;
2663 2236
2664 case 'd': 2237 case 'd':
2665 case 'i': 2238 case 'i':
2666 spec->flags |= SIGN; 2239 spec->flags |= SIGN;
2667 break; <<
2668 case 'u': 2240 case 'u':
2669 break; 2241 break;
2670 2242
2671 case 'n': 2243 case 'n':
2672 /* 2244 /*
2673 * Since %n poses a greater s 2245 * Since %n poses a greater security risk than
2674 * utility, treat it as any o 2246 * utility, treat it as any other invalid or
2675 * unsupported format specifi 2247 * unsupported format specifier.
2676 */ 2248 */
2677 fallthrough; !! 2249 /* Fall-through */
2678 2250
2679 default: 2251 default:
2680 WARN_ONCE(1, "Please remove u 2252 WARN_ONCE(1, "Please remove unsupported %%%c in format string\n", *fmt);
2681 spec->type = FORMAT_TYPE_INVA 2253 spec->type = FORMAT_TYPE_INVALID;
2682 return fmt - start; 2254 return fmt - start;
2683 } 2255 }
2684 2256
2685 if (qualifier == 'L') 2257 if (qualifier == 'L')
2686 spec->type = FORMAT_TYPE_LONG 2258 spec->type = FORMAT_TYPE_LONG_LONG;
2687 else if (qualifier == 'l') { 2259 else if (qualifier == 'l') {
2688 BUILD_BUG_ON(FORMAT_TYPE_ULON 2260 BUILD_BUG_ON(FORMAT_TYPE_ULONG + SIGN != FORMAT_TYPE_LONG);
2689 spec->type = FORMAT_TYPE_ULON 2261 spec->type = FORMAT_TYPE_ULONG + (spec->flags & SIGN);
2690 } else if (qualifier == 'z') { 2262 } else if (qualifier == 'z') {
2691 spec->type = FORMAT_TYPE_SIZE 2263 spec->type = FORMAT_TYPE_SIZE_T;
2692 } else if (qualifier == 't') { 2264 } else if (qualifier == 't') {
2693 spec->type = FORMAT_TYPE_PTRD 2265 spec->type = FORMAT_TYPE_PTRDIFF;
2694 } else if (qualifier == 'H') { 2266 } else if (qualifier == 'H') {
2695 BUILD_BUG_ON(FORMAT_TYPE_UBYT 2267 BUILD_BUG_ON(FORMAT_TYPE_UBYTE + SIGN != FORMAT_TYPE_BYTE);
2696 spec->type = FORMAT_TYPE_UBYT 2268 spec->type = FORMAT_TYPE_UBYTE + (spec->flags & SIGN);
2697 } else if (qualifier == 'h') { 2269 } else if (qualifier == 'h') {
2698 BUILD_BUG_ON(FORMAT_TYPE_USHO 2270 BUILD_BUG_ON(FORMAT_TYPE_USHORT + SIGN != FORMAT_TYPE_SHORT);
2699 spec->type = FORMAT_TYPE_USHO 2271 spec->type = FORMAT_TYPE_USHORT + (spec->flags & SIGN);
2700 } else { 2272 } else {
2701 BUILD_BUG_ON(FORMAT_TYPE_UINT 2273 BUILD_BUG_ON(FORMAT_TYPE_UINT + SIGN != FORMAT_TYPE_INT);
2702 spec->type = FORMAT_TYPE_UINT 2274 spec->type = FORMAT_TYPE_UINT + (spec->flags & SIGN);
2703 } 2275 }
2704 2276
2705 return ++fmt - start; 2277 return ++fmt - start;
2706 } 2278 }
2707 2279
2708 static void 2280 static void
2709 set_field_width(struct printf_spec *spec, int 2281 set_field_width(struct printf_spec *spec, int width)
2710 { 2282 {
2711 spec->field_width = width; 2283 spec->field_width = width;
2712 if (WARN_ONCE(spec->field_width != wi 2284 if (WARN_ONCE(spec->field_width != width, "field width %d too large", width)) {
2713 spec->field_width = clamp(wid 2285 spec->field_width = clamp(width, -FIELD_WIDTH_MAX, FIELD_WIDTH_MAX);
2714 } 2286 }
2715 } 2287 }
2716 2288
2717 static void 2289 static void
2718 set_precision(struct printf_spec *spec, int p 2290 set_precision(struct printf_spec *spec, int prec)
2719 { 2291 {
2720 spec->precision = prec; 2292 spec->precision = prec;
2721 if (WARN_ONCE(spec->precision != prec 2293 if (WARN_ONCE(spec->precision != prec, "precision %d too large", prec)) {
2722 spec->precision = clamp(prec, 2294 spec->precision = clamp(prec, 0, PRECISION_MAX);
2723 } 2295 }
2724 } 2296 }
2725 2297
2726 /** 2298 /**
2727 * vsnprintf - Format a string and place it i 2299 * vsnprintf - Format a string and place it in a buffer
2728 * @buf: The buffer to place the result into 2300 * @buf: The buffer to place the result into
2729 * @size: The size of the buffer, including t 2301 * @size: The size of the buffer, including the trailing null space
2730 * @fmt: The format string to use 2302 * @fmt: The format string to use
2731 * @args: Arguments for the format string 2303 * @args: Arguments for the format string
2732 * 2304 *
2733 * This function generally follows C99 vsnpri 2305 * This function generally follows C99 vsnprintf, but has some
2734 * extensions and a few limitations: 2306 * extensions and a few limitations:
2735 * 2307 *
2736 * - ``%n`` is unsupported 2308 * - ``%n`` is unsupported
2737 * - ``%p*`` is handled by pointer() 2309 * - ``%p*`` is handled by pointer()
2738 * 2310 *
2739 * See pointer() or Documentation/core-api/pr 2311 * See pointer() or Documentation/core-api/printk-formats.rst for more
2740 * extensive description. 2312 * extensive description.
2741 * 2313 *
2742 * **Please update the documentation in both 2314 * **Please update the documentation in both places when making changes**
2743 * 2315 *
2744 * The return value is the number of characte 2316 * The return value is the number of characters which would
2745 * be generated for the given input, excludin 2317 * be generated for the given input, excluding the trailing
2746 * '\0', as per ISO C99. If you want to have 2318 * '\0', as per ISO C99. If you want to have the exact
2747 * number of characters written into @buf as 2319 * number of characters written into @buf as return value
2748 * (not including the trailing '\0'), use vsc 2320 * (not including the trailing '\0'), use vscnprintf(). If the
2749 * return is greater than or equal to @size, 2321 * return is greater than or equal to @size, the resulting
2750 * string is truncated. 2322 * string is truncated.
2751 * 2323 *
2752 * If you're not already dealing with a va_li 2324 * If you're not already dealing with a va_list consider using snprintf().
2753 */ 2325 */
2754 int vsnprintf(char *buf, size_t size, const c 2326 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
2755 { 2327 {
2756 unsigned long long num; 2328 unsigned long long num;
2757 char *str, *end; 2329 char *str, *end;
2758 struct printf_spec spec = {0}; 2330 struct printf_spec spec = {0};
2759 2331
2760 /* Reject out-of-range values early. 2332 /* Reject out-of-range values early. Large positive sizes are
2761 used for unknown buffer sizes. */ 2333 used for unknown buffer sizes. */
2762 if (WARN_ON_ONCE(size > INT_MAX)) 2334 if (WARN_ON_ONCE(size > INT_MAX))
2763 return 0; 2335 return 0;
2764 2336
2765 str = buf; 2337 str = buf;
2766 end = buf + size; 2338 end = buf + size;
2767 2339
2768 /* Make sure end is always >= buf */ 2340 /* Make sure end is always >= buf */
2769 if (end < buf) { 2341 if (end < buf) {
2770 end = ((void *)-1); 2342 end = ((void *)-1);
2771 size = end - buf; 2343 size = end - buf;
2772 } 2344 }
2773 2345
2774 while (*fmt) { 2346 while (*fmt) {
2775 const char *old_fmt = fmt; 2347 const char *old_fmt = fmt;
2776 int read = format_decode(fmt, 2348 int read = format_decode(fmt, &spec);
2777 2349
2778 fmt += read; 2350 fmt += read;
2779 2351
2780 switch (spec.type) { 2352 switch (spec.type) {
2781 case FORMAT_TYPE_NONE: { 2353 case FORMAT_TYPE_NONE: {
2782 int copy = read; 2354 int copy = read;
2783 if (str < end) { 2355 if (str < end) {
2784 if (copy > en 2356 if (copy > end - str)
2785 copy 2357 copy = end - str;
2786 memcpy(str, o 2358 memcpy(str, old_fmt, copy);
2787 } 2359 }
2788 str += read; 2360 str += read;
2789 break; 2361 break;
2790 } 2362 }
2791 2363
2792 case FORMAT_TYPE_WIDTH: 2364 case FORMAT_TYPE_WIDTH:
2793 set_field_width(&spec 2365 set_field_width(&spec, va_arg(args, int));
2794 break; 2366 break;
2795 2367
2796 case FORMAT_TYPE_PRECISION: 2368 case FORMAT_TYPE_PRECISION:
2797 set_precision(&spec, 2369 set_precision(&spec, va_arg(args, int));
2798 break; 2370 break;
2799 2371
2800 case FORMAT_TYPE_CHAR: { 2372 case FORMAT_TYPE_CHAR: {
2801 char c; 2373 char c;
2802 2374
2803 if (!(spec.flags & LE 2375 if (!(spec.flags & LEFT)) {
2804 while (--spec 2376 while (--spec.field_width > 0) {
2805 if (s 2377 if (str < end)
2806 2378 *str = ' ';
2807 ++str 2379 ++str;
2808 2380
2809 } 2381 }
2810 } 2382 }
2811 c = (unsigned char) v 2383 c = (unsigned char) va_arg(args, int);
2812 if (str < end) 2384 if (str < end)
2813 *str = c; 2385 *str = c;
2814 ++str; 2386 ++str;
2815 while (--spec.field_w 2387 while (--spec.field_width > 0) {
2816 if (str < end 2388 if (str < end)
2817 *str 2389 *str = ' ';
2818 ++str; 2390 ++str;
2819 } 2391 }
2820 break; 2392 break;
2821 } 2393 }
2822 2394
2823 case FORMAT_TYPE_STR: 2395 case FORMAT_TYPE_STR:
2824 str = string(str, end 2396 str = string(str, end, va_arg(args, char *), spec);
2825 break; 2397 break;
2826 2398
2827 case FORMAT_TYPE_PTR: 2399 case FORMAT_TYPE_PTR:
2828 str = pointer(fmt, st 2400 str = pointer(fmt, str, end, va_arg(args, void *),
2829 spec); 2401 spec);
2830 while (isalnum(*fmt)) 2402 while (isalnum(*fmt))
2831 fmt++; 2403 fmt++;
2832 break; 2404 break;
2833 2405
2834 case FORMAT_TYPE_PERCENT_CHAR 2406 case FORMAT_TYPE_PERCENT_CHAR:
2835 if (str < end) 2407 if (str < end)
2836 *str = '%'; 2408 *str = '%';
2837 ++str; 2409 ++str;
2838 break; 2410 break;
2839 2411
2840 case FORMAT_TYPE_INVALID: 2412 case FORMAT_TYPE_INVALID:
2841 /* 2413 /*
2842 * Presumably the arg 2414 * Presumably the arguments passed gcc's type
2843 * checking, but ther 2415 * checking, but there is no safe or sane way
2844 * for us to continue 2416 * for us to continue parsing the format and
2845 * fetching from the 2417 * fetching from the va_list; the remaining
2846 * specifiers and arg 2418 * specifiers and arguments would be out of
2847 * sync. 2419 * sync.
2848 */ 2420 */
2849 goto out; 2421 goto out;
2850 2422
2851 default: 2423 default:
2852 switch (spec.type) { 2424 switch (spec.type) {
2853 case FORMAT_TYPE_LONG 2425 case FORMAT_TYPE_LONG_LONG:
2854 num = va_arg( 2426 num = va_arg(args, long long);
2855 break; 2427 break;
2856 case FORMAT_TYPE_ULON 2428 case FORMAT_TYPE_ULONG:
2857 num = va_arg( 2429 num = va_arg(args, unsigned long);
2858 break; 2430 break;
2859 case FORMAT_TYPE_LONG 2431 case FORMAT_TYPE_LONG:
2860 num = va_arg( 2432 num = va_arg(args, long);
2861 break; 2433 break;
2862 case FORMAT_TYPE_SIZE 2434 case FORMAT_TYPE_SIZE_T:
2863 if (spec.flag 2435 if (spec.flags & SIGN)
2864 num = 2436 num = va_arg(args, ssize_t);
2865 else 2437 else
2866 num = 2438 num = va_arg(args, size_t);
2867 break; 2439 break;
2868 case FORMAT_TYPE_PTRD 2440 case FORMAT_TYPE_PTRDIFF:
2869 num = va_arg( 2441 num = va_arg(args, ptrdiff_t);
2870 break; 2442 break;
2871 case FORMAT_TYPE_UBYT 2443 case FORMAT_TYPE_UBYTE:
2872 num = (unsign 2444 num = (unsigned char) va_arg(args, int);
2873 break; 2445 break;
2874 case FORMAT_TYPE_BYTE 2446 case FORMAT_TYPE_BYTE:
2875 num = (signed 2447 num = (signed char) va_arg(args, int);
2876 break; 2448 break;
2877 case FORMAT_TYPE_USHO 2449 case FORMAT_TYPE_USHORT:
2878 num = (unsign 2450 num = (unsigned short) va_arg(args, int);
2879 break; 2451 break;
2880 case FORMAT_TYPE_SHOR 2452 case FORMAT_TYPE_SHORT:
2881 num = (short) 2453 num = (short) va_arg(args, int);
2882 break; 2454 break;
2883 case FORMAT_TYPE_INT: 2455 case FORMAT_TYPE_INT:
2884 num = (int) v 2456 num = (int) va_arg(args, int);
2885 break; 2457 break;
2886 default: 2458 default:
2887 num = va_arg( 2459 num = va_arg(args, unsigned int);
2888 } 2460 }
2889 2461
2890 str = number(str, end 2462 str = number(str, end, num, spec);
2891 } 2463 }
2892 } 2464 }
2893 2465
2894 out: 2466 out:
2895 if (size > 0) { 2467 if (size > 0) {
2896 if (str < end) 2468 if (str < end)
2897 *str = '\0'; 2469 *str = '\0';
2898 else 2470 else
2899 end[-1] = '\0'; 2471 end[-1] = '\0';
2900 } 2472 }
2901 2473
2902 /* the trailing null byte doesn't cou 2474 /* the trailing null byte doesn't count towards the total */
2903 return str-buf; 2475 return str-buf;
2904 2476
2905 } 2477 }
2906 EXPORT_SYMBOL(vsnprintf); 2478 EXPORT_SYMBOL(vsnprintf);
2907 2479
2908 /** 2480 /**
2909 * vscnprintf - Format a string and place it 2481 * vscnprintf - Format a string and place it in a buffer
2910 * @buf: The buffer to place the result into 2482 * @buf: The buffer to place the result into
2911 * @size: The size of the buffer, including t 2483 * @size: The size of the buffer, including the trailing null space
2912 * @fmt: The format string to use 2484 * @fmt: The format string to use
2913 * @args: Arguments for the format string 2485 * @args: Arguments for the format string
2914 * 2486 *
2915 * The return value is the number of characte 2487 * The return value is the number of characters which have been written into
2916 * the @buf not including the trailing '\0'. 2488 * the @buf not including the trailing '\0'. If @size is == 0 the function
2917 * returns 0. 2489 * returns 0.
2918 * 2490 *
2919 * If you're not already dealing with a va_li 2491 * If you're not already dealing with a va_list consider using scnprintf().
2920 * 2492 *
2921 * See the vsnprintf() documentation for form 2493 * See the vsnprintf() documentation for format string extensions over C99.
2922 */ 2494 */
2923 int vscnprintf(char *buf, size_t size, const 2495 int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
2924 { 2496 {
2925 int i; 2497 int i;
2926 2498
2927 if (unlikely(!size)) <<
2928 return 0; <<
2929 <<
2930 i = vsnprintf(buf, size, fmt, args); 2499 i = vsnprintf(buf, size, fmt, args);
2931 2500
2932 if (likely(i < size)) 2501 if (likely(i < size))
2933 return i; 2502 return i;
2934 !! 2503 if (size != 0)
2935 return size - 1; !! 2504 return size - 1;
>> 2505 return 0;
2936 } 2506 }
2937 EXPORT_SYMBOL(vscnprintf); 2507 EXPORT_SYMBOL(vscnprintf);
2938 2508
2939 /** 2509 /**
2940 * snprintf - Format a string and place it in 2510 * snprintf - Format a string and place it in a buffer
2941 * @buf: The buffer to place the result into 2511 * @buf: The buffer to place the result into
2942 * @size: The size of the buffer, including t 2512 * @size: The size of the buffer, including the trailing null space
2943 * @fmt: The format string to use 2513 * @fmt: The format string to use
2944 * @...: Arguments for the format string 2514 * @...: Arguments for the format string
2945 * 2515 *
2946 * The return value is the number of characte 2516 * The return value is the number of characters which would be
2947 * generated for the given input, excluding t 2517 * generated for the given input, excluding the trailing null,
2948 * as per ISO C99. If the return is greater 2518 * as per ISO C99. If the return is greater than or equal to
2949 * @size, the resulting string is truncated. 2519 * @size, the resulting string is truncated.
2950 * 2520 *
2951 * See the vsnprintf() documentation for form 2521 * See the vsnprintf() documentation for format string extensions over C99.
2952 */ 2522 */
2953 int snprintf(char *buf, size_t size, const ch 2523 int snprintf(char *buf, size_t size, const char *fmt, ...)
2954 { 2524 {
2955 va_list args; 2525 va_list args;
2956 int i; 2526 int i;
2957 2527
2958 va_start(args, fmt); 2528 va_start(args, fmt);
2959 i = vsnprintf(buf, size, fmt, args); 2529 i = vsnprintf(buf, size, fmt, args);
2960 va_end(args); 2530 va_end(args);
2961 2531
2962 return i; 2532 return i;
2963 } 2533 }
2964 EXPORT_SYMBOL(snprintf); 2534 EXPORT_SYMBOL(snprintf);
2965 2535
2966 /** 2536 /**
2967 * scnprintf - Format a string and place it i 2537 * scnprintf - Format a string and place it in a buffer
2968 * @buf: The buffer to place the result into 2538 * @buf: The buffer to place the result into
2969 * @size: The size of the buffer, including t 2539 * @size: The size of the buffer, including the trailing null space
2970 * @fmt: The format string to use 2540 * @fmt: The format string to use
2971 * @...: Arguments for the format string 2541 * @...: Arguments for the format string
2972 * 2542 *
2973 * The return value is the number of characte 2543 * The return value is the number of characters written into @buf not including
2974 * the trailing '\0'. If @size is == 0 the fu 2544 * the trailing '\0'. If @size is == 0 the function returns 0.
2975 */ 2545 */
2976 2546
2977 int scnprintf(char *buf, size_t size, const c 2547 int scnprintf(char *buf, size_t size, const char *fmt, ...)
2978 { 2548 {
2979 va_list args; 2549 va_list args;
2980 int i; 2550 int i;
2981 2551
2982 va_start(args, fmt); 2552 va_start(args, fmt);
2983 i = vscnprintf(buf, size, fmt, args); 2553 i = vscnprintf(buf, size, fmt, args);
2984 va_end(args); 2554 va_end(args);
2985 2555
2986 return i; 2556 return i;
2987 } 2557 }
2988 EXPORT_SYMBOL(scnprintf); 2558 EXPORT_SYMBOL(scnprintf);
2989 2559
2990 /** 2560 /**
2991 * vsprintf - Format a string and place it in 2561 * vsprintf - Format a string and place it in a buffer
2992 * @buf: The buffer to place the result into 2562 * @buf: The buffer to place the result into
2993 * @fmt: The format string to use 2563 * @fmt: The format string to use
2994 * @args: Arguments for the format string 2564 * @args: Arguments for the format string
2995 * 2565 *
2996 * The function returns the number of charact 2566 * The function returns the number of characters written
2997 * into @buf. Use vsnprintf() or vscnprintf() 2567 * into @buf. Use vsnprintf() or vscnprintf() in order to avoid
2998 * buffer overflows. 2568 * buffer overflows.
2999 * 2569 *
3000 * If you're not already dealing with a va_li 2570 * If you're not already dealing with a va_list consider using sprintf().
3001 * 2571 *
3002 * See the vsnprintf() documentation for form 2572 * See the vsnprintf() documentation for format string extensions over C99.
3003 */ 2573 */
3004 int vsprintf(char *buf, const char *fmt, va_l 2574 int vsprintf(char *buf, const char *fmt, va_list args)
3005 { 2575 {
3006 return vsnprintf(buf, INT_MAX, fmt, a 2576 return vsnprintf(buf, INT_MAX, fmt, args);
3007 } 2577 }
3008 EXPORT_SYMBOL(vsprintf); 2578 EXPORT_SYMBOL(vsprintf);
3009 2579
3010 /** 2580 /**
3011 * sprintf - Format a string and place it in 2581 * sprintf - Format a string and place it in a buffer
3012 * @buf: The buffer to place the result into 2582 * @buf: The buffer to place the result into
3013 * @fmt: The format string to use 2583 * @fmt: The format string to use
3014 * @...: Arguments for the format string 2584 * @...: Arguments for the format string
3015 * 2585 *
3016 * The function returns the number of charact 2586 * The function returns the number of characters written
3017 * into @buf. Use snprintf() or scnprintf() i 2587 * into @buf. Use snprintf() or scnprintf() in order to avoid
3018 * buffer overflows. 2588 * buffer overflows.
3019 * 2589 *
3020 * See the vsnprintf() documentation for form 2590 * See the vsnprintf() documentation for format string extensions over C99.
3021 */ 2591 */
3022 int sprintf(char *buf, const char *fmt, ...) 2592 int sprintf(char *buf, const char *fmt, ...)
3023 { 2593 {
3024 va_list args; 2594 va_list args;
3025 int i; 2595 int i;
3026 2596
3027 va_start(args, fmt); 2597 va_start(args, fmt);
3028 i = vsnprintf(buf, INT_MAX, fmt, args 2598 i = vsnprintf(buf, INT_MAX, fmt, args);
3029 va_end(args); 2599 va_end(args);
3030 2600
3031 return i; 2601 return i;
3032 } 2602 }
3033 EXPORT_SYMBOL(sprintf); 2603 EXPORT_SYMBOL(sprintf);
3034 2604
3035 #ifdef CONFIG_BINARY_PRINTF 2605 #ifdef CONFIG_BINARY_PRINTF
3036 /* 2606 /*
3037 * bprintf service: 2607 * bprintf service:
3038 * vbin_printf() - VA arguments to binary dat 2608 * vbin_printf() - VA arguments to binary data
3039 * bstr_printf() - Binary data to text string 2609 * bstr_printf() - Binary data to text string
3040 */ 2610 */
3041 2611
3042 /** 2612 /**
3043 * vbin_printf - Parse a format string and pl 2613 * vbin_printf - Parse a format string and place args' binary value in a buffer
3044 * @bin_buf: The buffer to place args' binary 2614 * @bin_buf: The buffer to place args' binary value
3045 * @size: The size of the buffer(by words(32b 2615 * @size: The size of the buffer(by words(32bits), not characters)
3046 * @fmt: The format string to use 2616 * @fmt: The format string to use
3047 * @args: Arguments for the format string 2617 * @args: Arguments for the format string
3048 * 2618 *
3049 * The format follows C99 vsnprintf, except % 2619 * The format follows C99 vsnprintf, except %n is ignored, and its argument
3050 * is skipped. 2620 * is skipped.
3051 * 2621 *
3052 * The return value is the number of words(32 2622 * The return value is the number of words(32bits) which would be generated for
3053 * the given input. 2623 * the given input.
3054 * 2624 *
3055 * NOTE: 2625 * NOTE:
3056 * If the return value is greater than @size, 2626 * If the return value is greater than @size, the resulting bin_buf is NOT
3057 * valid for bstr_printf(). 2627 * valid for bstr_printf().
3058 */ 2628 */
3059 int vbin_printf(u32 *bin_buf, size_t size, co 2629 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args)
3060 { 2630 {
3061 struct printf_spec spec = {0}; 2631 struct printf_spec spec = {0};
3062 char *str, *end; 2632 char *str, *end;
3063 int width; 2633 int width;
3064 2634
3065 str = (char *)bin_buf; 2635 str = (char *)bin_buf;
3066 end = (char *)(bin_buf + size); 2636 end = (char *)(bin_buf + size);
3067 2637
3068 #define save_arg(type) 2638 #define save_arg(type) \
3069 ({ 2639 ({ \
3070 unsigned long long value; 2640 unsigned long long value; \
3071 if (sizeof(type) == 8) { 2641 if (sizeof(type) == 8) { \
3072 unsigned long long val8; 2642 unsigned long long val8; \
3073 str = PTR_ALIGN(str, sizeof(u 2643 str = PTR_ALIGN(str, sizeof(u32)); \
3074 val8 = va_arg(args, unsigned 2644 val8 = va_arg(args, unsigned long long); \
3075 if (str + sizeof(type) <= end 2645 if (str + sizeof(type) <= end) { \
3076 *(u32 *)str = *(u32 * 2646 *(u32 *)str = *(u32 *)&val8; \
3077 *(u32 *)(str + 4) = * 2647 *(u32 *)(str + 4) = *((u32 *)&val8 + 1); \
3078 } 2648 } \
3079 value = val8; 2649 value = val8; \
3080 } else { 2650 } else { \
3081 unsigned int val4; 2651 unsigned int val4; \
3082 str = PTR_ALIGN(str, sizeof(t 2652 str = PTR_ALIGN(str, sizeof(type)); \
3083 val4 = va_arg(args, int); 2653 val4 = va_arg(args, int); \
3084 if (str + sizeof(type) <= end 2654 if (str + sizeof(type) <= end) \
3085 *(typeof(type) *)str 2655 *(typeof(type) *)str = (type)(long)val4; \
3086 value = (unsigned long long)v 2656 value = (unsigned long long)val4; \
3087 } 2657 } \
3088 str += sizeof(type); 2658 str += sizeof(type); \
3089 value; 2659 value; \
3090 }) 2660 })
3091 2661
3092 while (*fmt) { 2662 while (*fmt) {
3093 int read = format_decode(fmt, 2663 int read = format_decode(fmt, &spec);
3094 2664
3095 fmt += read; 2665 fmt += read;
3096 2666
3097 switch (spec.type) { 2667 switch (spec.type) {
3098 case FORMAT_TYPE_NONE: 2668 case FORMAT_TYPE_NONE:
3099 case FORMAT_TYPE_PERCENT_CHAR 2669 case FORMAT_TYPE_PERCENT_CHAR:
3100 break; 2670 break;
3101 case FORMAT_TYPE_INVALID: 2671 case FORMAT_TYPE_INVALID:
3102 goto out; 2672 goto out;
3103 2673
3104 case FORMAT_TYPE_WIDTH: 2674 case FORMAT_TYPE_WIDTH:
3105 case FORMAT_TYPE_PRECISION: 2675 case FORMAT_TYPE_PRECISION:
3106 width = (int)save_arg 2676 width = (int)save_arg(int);
3107 /* Pointers may requi 2677 /* Pointers may require the width */
3108 if (*fmt == 'p') 2678 if (*fmt == 'p')
3109 set_field_wid 2679 set_field_width(&spec, width);
3110 break; 2680 break;
3111 2681
3112 case FORMAT_TYPE_CHAR: 2682 case FORMAT_TYPE_CHAR:
3113 save_arg(char); 2683 save_arg(char);
3114 break; 2684 break;
3115 2685
3116 case FORMAT_TYPE_STR: { 2686 case FORMAT_TYPE_STR: {
3117 const char *save_str 2687 const char *save_str = va_arg(args, char *);
3118 const char *err_msg; <<
3119 size_t len; 2688 size_t len;
3120 2689
3121 err_msg = check_point !! 2690 if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
3122 if (err_msg) !! 2691 || (unsigned long)save_str < PAGE_SIZE)
3123 save_str = er !! 2692 save_str = "(null)";
3124 <<
3125 len = strlen(save_str 2693 len = strlen(save_str) + 1;
3126 if (str + len < end) 2694 if (str + len < end)
3127 memcpy(str, s 2695 memcpy(str, save_str, len);
3128 str += len; 2696 str += len;
3129 break; 2697 break;
3130 } 2698 }
3131 2699
3132 case FORMAT_TYPE_PTR: 2700 case FORMAT_TYPE_PTR:
3133 /* Dereferenced point 2701 /* Dereferenced pointers must be done now */
3134 switch (*fmt) { 2702 switch (*fmt) {
3135 /* Dereference of fun 2703 /* Dereference of functions is still OK */
3136 case 'S': 2704 case 'S':
3137 case 's': 2705 case 's':
>> 2706 case 'F':
>> 2707 case 'f':
3138 case 'x': 2708 case 'x':
3139 case 'K': 2709 case 'K':
3140 case 'e': <<
3141 save_arg(void 2710 save_arg(void *);
3142 break; 2711 break;
3143 default: 2712 default:
3144 if (!isalnum( 2713 if (!isalnum(*fmt)) {
3145 save_ 2714 save_arg(void *);
3146 break 2715 break;
3147 } 2716 }
3148 str = pointer 2717 str = pointer(fmt, str, end, va_arg(args, void *),
3149 2718 spec);
3150 if (str + 1 < 2719 if (str + 1 < end)
3151 *str+ 2720 *str++ = '\0';
3152 else 2721 else
3153 end[- 2722 end[-1] = '\0'; /* Must be nul terminated */
3154 } 2723 }
3155 /* skip all alphanume 2724 /* skip all alphanumeric pointer suffixes */
3156 while (isalnum(*fmt)) 2725 while (isalnum(*fmt))
3157 fmt++; 2726 fmt++;
3158 break; 2727 break;
3159 2728
3160 default: 2729 default:
3161 switch (spec.type) { 2730 switch (spec.type) {
3162 2731
3163 case FORMAT_TYPE_LONG 2732 case FORMAT_TYPE_LONG_LONG:
3164 save_arg(long 2733 save_arg(long long);
3165 break; 2734 break;
3166 case FORMAT_TYPE_ULON 2735 case FORMAT_TYPE_ULONG:
3167 case FORMAT_TYPE_LONG 2736 case FORMAT_TYPE_LONG:
3168 save_arg(unsi 2737 save_arg(unsigned long);
3169 break; 2738 break;
3170 case FORMAT_TYPE_SIZE 2739 case FORMAT_TYPE_SIZE_T:
3171 save_arg(size 2740 save_arg(size_t);
3172 break; 2741 break;
3173 case FORMAT_TYPE_PTRD 2742 case FORMAT_TYPE_PTRDIFF:
3174 save_arg(ptrd 2743 save_arg(ptrdiff_t);
3175 break; 2744 break;
3176 case FORMAT_TYPE_UBYT 2745 case FORMAT_TYPE_UBYTE:
3177 case FORMAT_TYPE_BYTE 2746 case FORMAT_TYPE_BYTE:
3178 save_arg(char 2747 save_arg(char);
3179 break; 2748 break;
3180 case FORMAT_TYPE_USHO 2749 case FORMAT_TYPE_USHORT:
3181 case FORMAT_TYPE_SHOR 2750 case FORMAT_TYPE_SHORT:
3182 save_arg(shor 2751 save_arg(short);
3183 break; 2752 break;
3184 default: 2753 default:
3185 save_arg(int) 2754 save_arg(int);
3186 } 2755 }
3187 } 2756 }
3188 } 2757 }
3189 2758
3190 out: 2759 out:
3191 return (u32 *)(PTR_ALIGN(str, sizeof( 2760 return (u32 *)(PTR_ALIGN(str, sizeof(u32))) - bin_buf;
3192 #undef save_arg 2761 #undef save_arg
3193 } 2762 }
3194 EXPORT_SYMBOL_GPL(vbin_printf); 2763 EXPORT_SYMBOL_GPL(vbin_printf);
3195 2764
3196 /** 2765 /**
3197 * bstr_printf - Format a string from binary 2766 * bstr_printf - Format a string from binary arguments and place it in a buffer
3198 * @buf: The buffer to place the result into 2767 * @buf: The buffer to place the result into
3199 * @size: The size of the buffer, including t 2768 * @size: The size of the buffer, including the trailing null space
3200 * @fmt: The format string to use 2769 * @fmt: The format string to use
3201 * @bin_buf: Binary arguments for the format 2770 * @bin_buf: Binary arguments for the format string
3202 * 2771 *
3203 * This function like C99 vsnprintf, but the 2772 * This function like C99 vsnprintf, but the difference is that vsnprintf gets
3204 * arguments from stack, and bstr_printf gets 2773 * arguments from stack, and bstr_printf gets arguments from @bin_buf which is
3205 * a binary buffer that generated by vbin_pri 2774 * a binary buffer that generated by vbin_printf.
3206 * 2775 *
3207 * The format follows C99 vsnprintf, but has 2776 * The format follows C99 vsnprintf, but has some extensions:
3208 * see vsnprintf comment for details. 2777 * see vsnprintf comment for details.
3209 * 2778 *
3210 * The return value is the number of characte 2779 * The return value is the number of characters which would
3211 * be generated for the given input, excludin 2780 * be generated for the given input, excluding the trailing
3212 * '\0', as per ISO C99. If you want to have 2781 * '\0', as per ISO C99. If you want to have the exact
3213 * number of characters written into @buf as 2782 * number of characters written into @buf as return value
3214 * (not including the trailing '\0'), use vsc 2783 * (not including the trailing '\0'), use vscnprintf(). If the
3215 * return is greater than or equal to @size, 2784 * return is greater than or equal to @size, the resulting
3216 * string is truncated. 2785 * string is truncated.
3217 */ 2786 */
3218 int bstr_printf(char *buf, size_t size, const 2787 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf)
3219 { 2788 {
3220 struct printf_spec spec = {0}; 2789 struct printf_spec spec = {0};
3221 char *str, *end; 2790 char *str, *end;
3222 const char *args = (const char *)bin_ 2791 const char *args = (const char *)bin_buf;
3223 2792
3224 if (WARN_ON_ONCE(size > INT_MAX)) 2793 if (WARN_ON_ONCE(size > INT_MAX))
3225 return 0; 2794 return 0;
3226 2795
3227 str = buf; 2796 str = buf;
3228 end = buf + size; 2797 end = buf + size;
3229 2798
3230 #define get_arg(type) 2799 #define get_arg(type) \
3231 ({ 2800 ({ \
3232 typeof(type) value; 2801 typeof(type) value; \
3233 if (sizeof(type) == 8) { 2802 if (sizeof(type) == 8) { \
3234 args = PTR_ALIGN(args, sizeof 2803 args = PTR_ALIGN(args, sizeof(u32)); \
3235 *(u32 *)&value = *(u32 *)args 2804 *(u32 *)&value = *(u32 *)args; \
3236 *((u32 *)&value + 1) = *(u32 2805 *((u32 *)&value + 1) = *(u32 *)(args + 4); \
3237 } else { 2806 } else { \
3238 args = PTR_ALIGN(args, sizeof 2807 args = PTR_ALIGN(args, sizeof(type)); \
3239 value = *(typeof(type) *)args 2808 value = *(typeof(type) *)args; \
3240 } 2809 } \
3241 args += sizeof(type); 2810 args += sizeof(type); \
3242 value; 2811 value; \
3243 }) 2812 })
3244 2813
3245 /* Make sure end is always >= buf */ 2814 /* Make sure end is always >= buf */
3246 if (end < buf) { 2815 if (end < buf) {
3247 end = ((void *)-1); 2816 end = ((void *)-1);
3248 size = end - buf; 2817 size = end - buf;
3249 } 2818 }
3250 2819
3251 while (*fmt) { 2820 while (*fmt) {
3252 const char *old_fmt = fmt; 2821 const char *old_fmt = fmt;
3253 int read = format_decode(fmt, 2822 int read = format_decode(fmt, &spec);
3254 2823
3255 fmt += read; 2824 fmt += read;
3256 2825
3257 switch (spec.type) { 2826 switch (spec.type) {
3258 case FORMAT_TYPE_NONE: { 2827 case FORMAT_TYPE_NONE: {
3259 int copy = read; 2828 int copy = read;
3260 if (str < end) { 2829 if (str < end) {
3261 if (copy > en 2830 if (copy > end - str)
3262 copy 2831 copy = end - str;
3263 memcpy(str, o 2832 memcpy(str, old_fmt, copy);
3264 } 2833 }
3265 str += read; 2834 str += read;
3266 break; 2835 break;
3267 } 2836 }
3268 2837
3269 case FORMAT_TYPE_WIDTH: 2838 case FORMAT_TYPE_WIDTH:
3270 set_field_width(&spec 2839 set_field_width(&spec, get_arg(int));
3271 break; 2840 break;
3272 2841
3273 case FORMAT_TYPE_PRECISION: 2842 case FORMAT_TYPE_PRECISION:
3274 set_precision(&spec, 2843 set_precision(&spec, get_arg(int));
3275 break; 2844 break;
3276 2845
3277 case FORMAT_TYPE_CHAR: { 2846 case FORMAT_TYPE_CHAR: {
3278 char c; 2847 char c;
3279 2848
3280 if (!(spec.flags & LE 2849 if (!(spec.flags & LEFT)) {
3281 while (--spec 2850 while (--spec.field_width > 0) {
3282 if (s 2851 if (str < end)
3283 2852 *str = ' ';
3284 ++str 2853 ++str;
3285 } 2854 }
3286 } 2855 }
3287 c = (unsigned char) g 2856 c = (unsigned char) get_arg(char);
3288 if (str < end) 2857 if (str < end)
3289 *str = c; 2858 *str = c;
3290 ++str; 2859 ++str;
3291 while (--spec.field_w 2860 while (--spec.field_width > 0) {
3292 if (str < end 2861 if (str < end)
3293 *str 2862 *str = ' ';
3294 ++str; 2863 ++str;
3295 } 2864 }
3296 break; 2865 break;
3297 } 2866 }
3298 2867
3299 case FORMAT_TYPE_STR: { 2868 case FORMAT_TYPE_STR: {
3300 const char *str_arg = 2869 const char *str_arg = args;
3301 args += strlen(str_ar 2870 args += strlen(str_arg) + 1;
3302 str = string(str, end 2871 str = string(str, end, (char *)str_arg, spec);
3303 break; 2872 break;
3304 } 2873 }
3305 2874
3306 case FORMAT_TYPE_PTR: { 2875 case FORMAT_TYPE_PTR: {
3307 bool process = false; 2876 bool process = false;
3308 int copy, len; 2877 int copy, len;
3309 /* Non function deref 2878 /* Non function dereferences were already done */
3310 switch (*fmt) { 2879 switch (*fmt) {
3311 case 'S': 2880 case 'S':
3312 case 's': 2881 case 's':
>> 2882 case 'F':
>> 2883 case 'f':
3313 case 'x': 2884 case 'x':
3314 case 'K': 2885 case 'K':
3315 case 'e': <<
3316 process = tru 2886 process = true;
3317 break; 2887 break;
3318 default: 2888 default:
3319 if (!isalnum( 2889 if (!isalnum(*fmt)) {
3320 proce 2890 process = true;
3321 break 2891 break;
3322 } 2892 }
3323 /* Pointer de 2893 /* Pointer dereference was already processed */
3324 if (str < end 2894 if (str < end) {
3325 len = 2895 len = copy = strlen(args);
3326 if (c 2896 if (copy > end - str)
3327 2897 copy = end - str;
3328 memcp 2898 memcpy(str, args, copy);
3329 str + 2899 str += len;
3330 args 2900 args += len + 1;
3331 } 2901 }
3332 } 2902 }
3333 if (process) 2903 if (process)
3334 str = pointer 2904 str = pointer(fmt, str, end, get_arg(void *), spec);
3335 2905
3336 while (isalnum(*fmt)) 2906 while (isalnum(*fmt))
3337 fmt++; 2907 fmt++;
3338 break; 2908 break;
3339 } 2909 }
3340 2910
3341 case FORMAT_TYPE_PERCENT_CHAR 2911 case FORMAT_TYPE_PERCENT_CHAR:
3342 if (str < end) 2912 if (str < end)
3343 *str = '%'; 2913 *str = '%';
3344 ++str; 2914 ++str;
3345 break; 2915 break;
3346 2916
3347 case FORMAT_TYPE_INVALID: 2917 case FORMAT_TYPE_INVALID:
3348 goto out; 2918 goto out;
3349 2919
3350 default: { 2920 default: {
3351 unsigned long long nu 2921 unsigned long long num;
3352 2922
3353 switch (spec.type) { 2923 switch (spec.type) {
3354 2924
3355 case FORMAT_TYPE_LONG 2925 case FORMAT_TYPE_LONG_LONG:
3356 num = get_arg 2926 num = get_arg(long long);
3357 break; 2927 break;
3358 case FORMAT_TYPE_ULON 2928 case FORMAT_TYPE_ULONG:
3359 case FORMAT_TYPE_LONG 2929 case FORMAT_TYPE_LONG:
3360 num = get_arg 2930 num = get_arg(unsigned long);
3361 break; 2931 break;
3362 case FORMAT_TYPE_SIZE 2932 case FORMAT_TYPE_SIZE_T:
3363 num = get_arg 2933 num = get_arg(size_t);
3364 break; 2934 break;
3365 case FORMAT_TYPE_PTRD 2935 case FORMAT_TYPE_PTRDIFF:
3366 num = get_arg 2936 num = get_arg(ptrdiff_t);
3367 break; 2937 break;
3368 case FORMAT_TYPE_UBYT 2938 case FORMAT_TYPE_UBYTE:
3369 num = get_arg 2939 num = get_arg(unsigned char);
3370 break; 2940 break;
3371 case FORMAT_TYPE_BYTE 2941 case FORMAT_TYPE_BYTE:
3372 num = get_arg 2942 num = get_arg(signed char);
3373 break; 2943 break;
3374 case FORMAT_TYPE_USHO 2944 case FORMAT_TYPE_USHORT:
3375 num = get_arg 2945 num = get_arg(unsigned short);
3376 break; 2946 break;
3377 case FORMAT_TYPE_SHOR 2947 case FORMAT_TYPE_SHORT:
3378 num = get_arg 2948 num = get_arg(short);
3379 break; 2949 break;
3380 case FORMAT_TYPE_UINT 2950 case FORMAT_TYPE_UINT:
3381 num = get_arg 2951 num = get_arg(unsigned int);
3382 break; 2952 break;
3383 default: 2953 default:
3384 num = get_arg 2954 num = get_arg(int);
3385 } 2955 }
3386 2956
3387 str = number(str, end 2957 str = number(str, end, num, spec);
3388 } /* default: */ 2958 } /* default: */
3389 } /* switch(spec.type) */ 2959 } /* switch(spec.type) */
3390 } /* while(*fmt) */ 2960 } /* while(*fmt) */
3391 2961
3392 out: 2962 out:
3393 if (size > 0) { 2963 if (size > 0) {
3394 if (str < end) 2964 if (str < end)
3395 *str = '\0'; 2965 *str = '\0';
3396 else 2966 else
3397 end[-1] = '\0'; 2967 end[-1] = '\0';
3398 } 2968 }
3399 2969
3400 #undef get_arg 2970 #undef get_arg
3401 2971
3402 /* the trailing null byte doesn't cou 2972 /* the trailing null byte doesn't count towards the total */
3403 return str - buf; 2973 return str - buf;
3404 } 2974 }
3405 EXPORT_SYMBOL_GPL(bstr_printf); 2975 EXPORT_SYMBOL_GPL(bstr_printf);
3406 2976
3407 /** 2977 /**
3408 * bprintf - Parse a format string and place 2978 * bprintf - Parse a format string and place args' binary value in a buffer
3409 * @bin_buf: The buffer to place args' binary 2979 * @bin_buf: The buffer to place args' binary value
3410 * @size: The size of the buffer(by words(32b 2980 * @size: The size of the buffer(by words(32bits), not characters)
3411 * @fmt: The format string to use 2981 * @fmt: The format string to use
3412 * @...: Arguments for the format string 2982 * @...: Arguments for the format string
3413 * 2983 *
3414 * The function returns the number of words(u 2984 * The function returns the number of words(u32) written
3415 * into @bin_buf. 2985 * into @bin_buf.
3416 */ 2986 */
3417 int bprintf(u32 *bin_buf, size_t size, const 2987 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...)
3418 { 2988 {
3419 va_list args; 2989 va_list args;
3420 int ret; 2990 int ret;
3421 2991
3422 va_start(args, fmt); 2992 va_start(args, fmt);
3423 ret = vbin_printf(bin_buf, size, fmt, 2993 ret = vbin_printf(bin_buf, size, fmt, args);
3424 va_end(args); 2994 va_end(args);
3425 2995
3426 return ret; 2996 return ret;
3427 } 2997 }
3428 EXPORT_SYMBOL_GPL(bprintf); 2998 EXPORT_SYMBOL_GPL(bprintf);
3429 2999
3430 #endif /* CONFIG_BINARY_PRINTF */ 3000 #endif /* CONFIG_BINARY_PRINTF */
3431 3001
3432 /** 3002 /**
3433 * vsscanf - Unformat a buffer into a list of 3003 * vsscanf - Unformat a buffer into a list of arguments
3434 * @buf: input buffer 3004 * @buf: input buffer
3435 * @fmt: format of buffer 3005 * @fmt: format of buffer
3436 * @args: arguments 3006 * @args: arguments
3437 */ 3007 */
3438 int vsscanf(const char *buf, const char *fmt, 3008 int vsscanf(const char *buf, const char *fmt, va_list args)
3439 { 3009 {
3440 const char *str = buf; 3010 const char *str = buf;
3441 char *next; 3011 char *next;
3442 char digit; 3012 char digit;
3443 int num = 0; 3013 int num = 0;
3444 u8 qualifier; 3014 u8 qualifier;
3445 unsigned int base; 3015 unsigned int base;
3446 union { 3016 union {
3447 long long s; 3017 long long s;
3448 unsigned long long u; 3018 unsigned long long u;
3449 } val; 3019 } val;
3450 s16 field_width; 3020 s16 field_width;
3451 bool is_sign; 3021 bool is_sign;
3452 3022
3453 while (*fmt) { 3023 while (*fmt) {
3454 /* skip any white space in fo 3024 /* skip any white space in format */
3455 /* white space in format matc !! 3025 /* white space in format matchs any amount of
3456 * white space, including non 3026 * white space, including none, in the input.
3457 */ 3027 */
3458 if (isspace(*fmt)) { 3028 if (isspace(*fmt)) {
3459 fmt = skip_spaces(++f 3029 fmt = skip_spaces(++fmt);
3460 str = skip_spaces(str 3030 str = skip_spaces(str);
3461 } 3031 }
3462 3032
3463 /* anything that is not a con 3033 /* anything that is not a conversion must match exactly */
3464 if (*fmt != '%' && *fmt) { 3034 if (*fmt != '%' && *fmt) {
3465 if (*fmt++ != *str++) 3035 if (*fmt++ != *str++)
3466 break; 3036 break;
3467 continue; 3037 continue;
3468 } 3038 }
3469 3039
3470 if (!*fmt) 3040 if (!*fmt)
3471 break; 3041 break;
3472 ++fmt; 3042 ++fmt;
3473 3043
3474 /* skip this conversion. 3044 /* skip this conversion.
3475 * advance both strings to ne 3045 * advance both strings to next white space
3476 */ 3046 */
3477 if (*fmt == '*') { 3047 if (*fmt == '*') {
3478 if (!*str) 3048 if (!*str)
3479 break; 3049 break;
3480 while (!isspace(*fmt) 3050 while (!isspace(*fmt) && *fmt != '%' && *fmt) {
3481 /* '%*[' not 3051 /* '%*[' not yet supported, invalid format */
3482 if (*fmt == ' 3052 if (*fmt == '[')
3483 retur 3053 return num;
3484 fmt++; 3054 fmt++;
3485 } 3055 }
3486 while (!isspace(*str) 3056 while (!isspace(*str) && *str)
3487 str++; 3057 str++;
3488 continue; 3058 continue;
3489 } 3059 }
3490 3060
3491 /* get field width */ 3061 /* get field width */
3492 field_width = -1; 3062 field_width = -1;
3493 if (isdigit(*fmt)) { 3063 if (isdigit(*fmt)) {
3494 field_width = skip_at 3064 field_width = skip_atoi(&fmt);
3495 if (field_width <= 0) 3065 if (field_width <= 0)
3496 break; 3066 break;
3497 } 3067 }
3498 3068
3499 /* get conversion qualifier * 3069 /* get conversion qualifier */
3500 qualifier = -1; 3070 qualifier = -1;
3501 if (*fmt == 'h' || _tolower(* 3071 if (*fmt == 'h' || _tolower(*fmt) == 'l' ||
3502 *fmt == 'z') { 3072 *fmt == 'z') {
3503 qualifier = *fmt++; 3073 qualifier = *fmt++;
3504 if (unlikely(qualifie 3074 if (unlikely(qualifier == *fmt)) {
3505 if (qualifier 3075 if (qualifier == 'h') {
3506 quali 3076 qualifier = 'H';
3507 fmt++ 3077 fmt++;
3508 } else if (qu 3078 } else if (qualifier == 'l') {
3509 quali 3079 qualifier = 'L';
3510 fmt++ 3080 fmt++;
3511 } 3081 }
3512 } 3082 }
3513 } 3083 }
3514 3084
3515 if (!*fmt) 3085 if (!*fmt)
3516 break; 3086 break;
3517 3087
3518 if (*fmt == 'n') { 3088 if (*fmt == 'n') {
3519 /* return number of c 3089 /* return number of characters read so far */
3520 *va_arg(args, int *) 3090 *va_arg(args, int *) = str - buf;
3521 ++fmt; 3091 ++fmt;
3522 continue; 3092 continue;
3523 } 3093 }
3524 3094
3525 if (!*str) 3095 if (!*str)
3526 break; 3096 break;
3527 3097
3528 base = 10; 3098 base = 10;
3529 is_sign = false; 3099 is_sign = false;
3530 3100
3531 switch (*fmt++) { 3101 switch (*fmt++) {
3532 case 'c': 3102 case 'c':
3533 { 3103 {
3534 char *s = (char *)va_ 3104 char *s = (char *)va_arg(args, char*);
3535 if (field_width == -1 3105 if (field_width == -1)
3536 field_width = 3106 field_width = 1;
3537 do { 3107 do {
3538 *s++ = *str++ 3108 *s++ = *str++;
3539 } while (--field_widt 3109 } while (--field_width > 0 && *str);
3540 num++; 3110 num++;
3541 } 3111 }
3542 continue; 3112 continue;
3543 case 's': 3113 case 's':
3544 { 3114 {
3545 char *s = (char *)va_ 3115 char *s = (char *)va_arg(args, char *);
3546 if (field_width == -1 3116 if (field_width == -1)
3547 field_width = 3117 field_width = SHRT_MAX;
3548 /* first, skip leadin 3118 /* first, skip leading white space in buffer */
3549 str = skip_spaces(str 3119 str = skip_spaces(str);
3550 3120
3551 /* now copy until nex 3121 /* now copy until next white space */
3552 while (*str && !isspa 3122 while (*str && !isspace(*str) && field_width--)
3553 *s++ = *str++ 3123 *s++ = *str++;
3554 *s = '\0'; 3124 *s = '\0';
3555 num++; 3125 num++;
3556 } 3126 }
3557 continue; 3127 continue;
3558 /* 3128 /*
3559 * Warning: This implementati 3129 * Warning: This implementation of the '[' conversion specifier
3560 * deviates from its glibc co 3130 * deviates from its glibc counterpart in the following ways:
3561 * (1) It does NOT support ra 3131 * (1) It does NOT support ranges i.e. '-' is NOT a special
3562 * character 3132 * character
3563 * (2) It cannot match the cl 3133 * (2) It cannot match the closing bracket ']' itself
3564 * (3) A field width is requi 3134 * (3) A field width is required
3565 * (4) '%*[' (discard matchin 3135 * (4) '%*[' (discard matching input) is currently not supported
3566 * 3136 *
3567 * Example usage: 3137 * Example usage:
3568 * ret = sscanf("00:0a:95","% 3138 * ret = sscanf("00:0a:95","%2[^:]:%2[^:]:%2[^:]",
3569 * buf1, buf2, b 3139 * buf1, buf2, buf3);
3570 * if (ret < 3) 3140 * if (ret < 3)
3571 * // etc.. 3141 * // etc..
3572 */ 3142 */
3573 case '[': 3143 case '[':
3574 { 3144 {
3575 char *s = (char *)va_ 3145 char *s = (char *)va_arg(args, char *);
3576 DECLARE_BITMAP(set, 2 3146 DECLARE_BITMAP(set, 256) = {0};
3577 unsigned int len = 0; 3147 unsigned int len = 0;
3578 bool negate = (*fmt = 3148 bool negate = (*fmt == '^');
3579 3149
3580 /* field width is req 3150 /* field width is required */
3581 if (field_width == -1 3151 if (field_width == -1)
3582 return num; 3152 return num;
3583 3153
3584 if (negate) 3154 if (negate)
3585 ++fmt; 3155 ++fmt;
3586 3156
3587 for ( ; *fmt && *fmt 3157 for ( ; *fmt && *fmt != ']'; ++fmt, ++len)
3588 __set_bit((u8 !! 3158 set_bit((u8)*fmt, set);
3589 3159
3590 /* no ']' or no chara 3160 /* no ']' or no character set found */
3591 if (!*fmt || !len) 3161 if (!*fmt || !len)
3592 return num; 3162 return num;
3593 ++fmt; 3163 ++fmt;
3594 3164
3595 if (negate) { 3165 if (negate) {
3596 bitmap_comple 3166 bitmap_complement(set, set, 256);
3597 /* exclude nu 3167 /* exclude null '\0' byte */
3598 __clear_bit(0 !! 3168 clear_bit(0, set);
3599 } 3169 }
3600 3170
3601 /* match must be non- 3171 /* match must be non-empty */
3602 if (!test_bit((u8)*st 3172 if (!test_bit((u8)*str, set))
3603 return num; 3173 return num;
3604 3174
3605 while (test_bit((u8)* 3175 while (test_bit((u8)*str, set) && field_width--)
3606 *s++ = *str++ 3176 *s++ = *str++;
3607 *s = '\0'; 3177 *s = '\0';
3608 ++num; 3178 ++num;
3609 } 3179 }
3610 continue; 3180 continue;
3611 case 'o': 3181 case 'o':
3612 base = 8; 3182 base = 8;
3613 break; 3183 break;
3614 case 'x': 3184 case 'x':
3615 case 'X': 3185 case 'X':
3616 base = 16; 3186 base = 16;
3617 break; 3187 break;
3618 case 'i': 3188 case 'i':
3619 base = 0; 3189 base = 0;
3620 fallthrough; !! 3190 /* fall through */
3621 case 'd': 3191 case 'd':
3622 is_sign = true; 3192 is_sign = true;
3623 fallthrough; !! 3193 /* fall through */
3624 case 'u': 3194 case 'u':
3625 break; 3195 break;
3626 case '%': 3196 case '%':
3627 /* looking for '%' in 3197 /* looking for '%' in str */
3628 if (*str++ != '%') 3198 if (*str++ != '%')
3629 return num; 3199 return num;
3630 continue; 3200 continue;
3631 default: 3201 default:
3632 /* invalid format; st 3202 /* invalid format; stop here */
3633 return num; 3203 return num;
3634 } 3204 }
3635 3205
3636 /* have some sort of integer 3206 /* have some sort of integer conversion.
3637 * first, skip white space in 3207 * first, skip white space in buffer.
3638 */ 3208 */
3639 str = skip_spaces(str); 3209 str = skip_spaces(str);
3640 3210
3641 digit = *str; 3211 digit = *str;
3642 if (is_sign && digit == '-') !! 3212 if (is_sign && digit == '-')
3643 if (field_width == 1) <<
3644 break; <<
3645 <<
3646 digit = *(str + 1); 3213 digit = *(str + 1);
3647 } <<
3648 3214
3649 if (!digit 3215 if (!digit
3650 || (base == 16 && !isxdig 3216 || (base == 16 && !isxdigit(digit))
3651 || (base == 10 && !isdigi 3217 || (base == 10 && !isdigit(digit))
3652 || (base == 8 && !isodigi !! 3218 || (base == 8 && (!isdigit(digit) || digit > '7'))
3653 || (base == 0 && !isdigit 3219 || (base == 0 && !isdigit(digit)))
3654 break; 3220 break;
3655 3221
3656 if (is_sign) 3222 if (is_sign)
3657 val.s = simple_strnto !! 3223 val.s = qualifier != 'L' ?
3658 !! 3224 simple_strtol(str, &next, base) :
>> 3225 simple_strtoll(str, &next, base);
3659 else 3226 else
3660 val.u = simple_strnto !! 3227 val.u = qualifier != 'L' ?
3661 !! 3228 simple_strtoul(str, &next, base) :
>> 3229 simple_strtoull(str, &next, base);
>> 3230
>> 3231 if (field_width > 0 && next - str > field_width) {
>> 3232 if (base == 0)
>> 3233 _parse_integer_fixup_radix(str, &base);
>> 3234 while (next - str > field_width) {
>> 3235 if (is_sign)
>> 3236 val.s = div_s64(val.s, base);
>> 3237 else
>> 3238 val.u = div_u64(val.u, base);
>> 3239 --next;
>> 3240 }
>> 3241 }
3662 3242
3663 switch (qualifier) { 3243 switch (qualifier) {
3664 case 'H': /* that's 'hh 3244 case 'H': /* that's 'hh' in format */
3665 if (is_sign) 3245 if (is_sign)
3666 *va_arg(args, 3246 *va_arg(args, signed char *) = val.s;
3667 else 3247 else
3668 *va_arg(args, 3248 *va_arg(args, unsigned char *) = val.u;
3669 break; 3249 break;
3670 case 'h': 3250 case 'h':
3671 if (is_sign) 3251 if (is_sign)
3672 *va_arg(args, 3252 *va_arg(args, short *) = val.s;
3673 else 3253 else
3674 *va_arg(args, 3254 *va_arg(args, unsigned short *) = val.u;
3675 break; 3255 break;
3676 case 'l': 3256 case 'l':
3677 if (is_sign) 3257 if (is_sign)
3678 *va_arg(args, 3258 *va_arg(args, long *) = val.s;
3679 else 3259 else
3680 *va_arg(args, 3260 *va_arg(args, unsigned long *) = val.u;
3681 break; 3261 break;
3682 case 'L': 3262 case 'L':
3683 if (is_sign) 3263 if (is_sign)
3684 *va_arg(args, 3264 *va_arg(args, long long *) = val.s;
3685 else 3265 else
3686 *va_arg(args, 3266 *va_arg(args, unsigned long long *) = val.u;
3687 break; 3267 break;
3688 case 'z': 3268 case 'z':
3689 *va_arg(args, size_t 3269 *va_arg(args, size_t *) = val.u;
3690 break; 3270 break;
3691 default: 3271 default:
3692 if (is_sign) 3272 if (is_sign)
3693 *va_arg(args, 3273 *va_arg(args, int *) = val.s;
3694 else 3274 else
3695 *va_arg(args, 3275 *va_arg(args, unsigned int *) = val.u;
3696 break; 3276 break;
3697 } 3277 }
3698 num++; 3278 num++;
3699 3279
3700 if (!next) 3280 if (!next)
3701 break; 3281 break;
3702 str = next; 3282 str = next;
3703 } 3283 }
3704 3284
3705 return num; 3285 return num;
3706 } 3286 }
3707 EXPORT_SYMBOL(vsscanf); 3287 EXPORT_SYMBOL(vsscanf);
3708 3288
3709 /** 3289 /**
3710 * sscanf - Unformat a buffer into a list of 3290 * sscanf - Unformat a buffer into a list of arguments
3711 * @buf: input buffer 3291 * @buf: input buffer
3712 * @fmt: formatting of buffer 3292 * @fmt: formatting of buffer
3713 * @...: resulting arguments 3293 * @...: resulting arguments
3714 */ 3294 */
3715 int sscanf(const char *buf, const char *fmt, 3295 int sscanf(const char *buf, const char *fmt, ...)
3716 { 3296 {
3717 va_list args; 3297 va_list args;
3718 int i; 3298 int i;
3719 3299
3720 va_start(args, fmt); 3300 va_start(args, fmt);
3721 i = vsscanf(buf, fmt, args); 3301 i = vsscanf(buf, fmt, args);
3722 va_end(args); 3302 va_end(args);
3723 3303
3724 return i; 3304 return i;
3725 } 3305 }
3726 EXPORT_SYMBOL(sscanf); 3306 EXPORT_SYMBOL(sscanf);
3727 3307
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