1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /********************************************* 2 /****************************************************************************/
3 /* 3 /*
4 * linux/fs/binfmt_flat.c 4 * linux/fs/binfmt_flat.c
5 * 5 *
6 * Copyright (C) 2000-2003 David McCullou 6 * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com>
7 * Copyright (C) 2002 Greg Ungerer <gerg@ 7 * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
8 * Copyright (C) 2002 SnapGear, by Paul D 8 * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com>
9 * Copyright (C) 2000, 2001 Lineo, by Dav 9 * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com>
10 * based heavily on: 10 * based heavily on:
11 * 11 *
12 * linux/fs/binfmt_aout.c: 12 * linux/fs/binfmt_aout.c:
13 * Copyright (C) 1991, 1992, 1996 Linus 13 * Copyright (C) 1991, 1992, 1996 Linus Torvalds
14 * linux/fs/binfmt_flat.c for 2.0 kernel 14 * linux/fs/binfmt_flat.c for 2.0 kernel
15 * Copyright (C) 1998 Kenneth Albano 15 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
16 * JAN/99 -- coded full program relocatio 16 * JAN/99 -- coded full program relocation (gerg@snapgear.com)
17 */ 17 */
18 18
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fm 19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
20 20
21 #include <linux/kernel.h> 21 #include <linux/kernel.h>
22 #include <linux/sched.h> 22 #include <linux/sched.h>
23 #include <linux/sched/task_stack.h> 23 #include <linux/sched/task_stack.h>
24 #include <linux/mm.h> 24 #include <linux/mm.h>
25 #include <linux/mman.h> 25 #include <linux/mman.h>
26 #include <linux/errno.h> 26 #include <linux/errno.h>
27 #include <linux/signal.h> 27 #include <linux/signal.h>
28 #include <linux/string.h> 28 #include <linux/string.h>
29 #include <linux/fs.h> 29 #include <linux/fs.h>
30 #include <linux/file.h> 30 #include <linux/file.h>
31 #include <linux/ptrace.h> 31 #include <linux/ptrace.h>
32 #include <linux/user.h> 32 #include <linux/user.h>
33 #include <linux/slab.h> 33 #include <linux/slab.h>
34 #include <linux/binfmts.h> 34 #include <linux/binfmts.h>
35 #include <linux/personality.h> 35 #include <linux/personality.h>
36 #include <linux/init.h> 36 #include <linux/init.h>
37 #include <linux/flat.h> 37 #include <linux/flat.h>
38 #include <linux/uaccess.h> 38 #include <linux/uaccess.h>
39 #include <linux/vmalloc.h> 39 #include <linux/vmalloc.h>
40 40
41 #include <asm/byteorder.h> 41 #include <asm/byteorder.h>
42 #include <linux/unaligned.h> !! 42 #include <asm/unaligned.h>
43 #include <asm/cacheflush.h> 43 #include <asm/cacheflush.h>
44 #include <asm/page.h> 44 #include <asm/page.h>
45 #include <asm/flat.h> 45 #include <asm/flat.h>
46 46
47 #ifndef flat_get_relocate_addr 47 #ifndef flat_get_relocate_addr
48 #define flat_get_relocate_addr(rel) (rel) 48 #define flat_get_relocate_addr(rel) (rel)
49 #endif 49 #endif
50 50
51 /********************************************* 51 /****************************************************************************/
52 52
53 /* 53 /*
54 * User data (data section and bss) needs to b 54 * User data (data section and bss) needs to be aligned.
55 * We pick 0x20 here because it is the max val 55 * We pick 0x20 here because it is the max value elf2flt has always
56 * used in producing FLAT files, and because i 56 * used in producing FLAT files, and because it seems to be large
57 * enough to make all the gcc alignment relate 57 * enough to make all the gcc alignment related tests happy.
58 */ 58 */
59 #define FLAT_DATA_ALIGN (0x20) 59 #define FLAT_DATA_ALIGN (0x20)
60 60
61 /* 61 /*
62 * User data (stack) also needs to be aligned. 62 * User data (stack) also needs to be aligned.
63 * Here we can be a bit looser than the data s 63 * Here we can be a bit looser than the data sections since this
64 * needs to only meet arch ABI requirements. 64 * needs to only meet arch ABI requirements.
65 */ 65 */
66 #define FLAT_STACK_ALIGN max_t(unsigned 66 #define FLAT_STACK_ALIGN max_t(unsigned long, sizeof(void *), ARCH_SLAB_MINALIGN)
67 67
68 #define RELOC_FAILED 0xff00ff01 /* Rel 68 #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
69 #define UNLOADED_LIB 0x7ff000ff /* Pla 69 #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
70 70
71 #define MAX_SHARED_LIBS (1) 71 #define MAX_SHARED_LIBS (1)
72 72
73 #ifdef CONFIG_BINFMT_FLAT_NO_DATA_START_OFFSET 73 #ifdef CONFIG_BINFMT_FLAT_NO_DATA_START_OFFSET
74 #define DATA_START_OFFSET_WORDS (0) 74 #define DATA_START_OFFSET_WORDS (0)
75 #define MAX_SHARED_LIBS_UPDATE (0) <<
76 #else 75 #else
77 #define DATA_START_OFFSET_WORDS (MAX_S 76 #define DATA_START_OFFSET_WORDS (MAX_SHARED_LIBS)
78 #define MAX_SHARED_LIBS_UPDATE (MAX_S <<
79 #endif 77 #endif
80 78
81 struct lib_info { 79 struct lib_info {
82 struct { 80 struct {
83 unsigned long start_code; 81 unsigned long start_code; /* Start of text segment */
84 unsigned long start_data; 82 unsigned long start_data; /* Start of data segment */
85 unsigned long start_brk; 83 unsigned long start_brk; /* End of data segment */
86 unsigned long text_len; 84 unsigned long text_len; /* Length of text segment */
87 unsigned long entry; 85 unsigned long entry; /* Start address for this module */
88 unsigned long build_date; 86 unsigned long build_date; /* When this one was compiled */
89 bool loaded; 87 bool loaded; /* Has this library been loaded? */
90 } lib_list[MAX_SHARED_LIBS]; 88 } lib_list[MAX_SHARED_LIBS];
91 }; 89 };
92 90
93 static int load_flat_binary(struct linux_binpr 91 static int load_flat_binary(struct linux_binprm *);
94 92
95 static struct linux_binfmt flat_format = { 93 static struct linux_binfmt flat_format = {
96 .module = THIS_MODULE, 94 .module = THIS_MODULE,
97 .load_binary = load_flat_binary, 95 .load_binary = load_flat_binary,
98 }; 96 };
99 97
100 98
101 /********************************************* 99 /****************************************************************************/
102 /* 100 /*
103 * create_flat_tables() parses the env- and ar 101 * create_flat_tables() parses the env- and arg-strings in new user
104 * memory and creates the pointer tables from 102 * memory and creates the pointer tables from them, and puts their
105 * addresses on the "stack", recording the new 103 * addresses on the "stack", recording the new stack pointer value.
106 */ 104 */
107 105
108 static int create_flat_tables(struct linux_bin 106 static int create_flat_tables(struct linux_binprm *bprm, unsigned long arg_start)
109 { 107 {
110 char __user *p; 108 char __user *p;
111 unsigned long __user *sp; 109 unsigned long __user *sp;
112 long i, len; 110 long i, len;
113 111
114 p = (char __user *)arg_start; 112 p = (char __user *)arg_start;
115 sp = (unsigned long __user *)current-> 113 sp = (unsigned long __user *)current->mm->start_stack;
116 114
117 sp -= bprm->envc + 1; 115 sp -= bprm->envc + 1;
118 sp -= bprm->argc + 1; 116 sp -= bprm->argc + 1;
119 if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGV 117 if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK))
120 sp -= 2; /* argvp + envp */ 118 sp -= 2; /* argvp + envp */
121 sp -= 1; /* &argc */ 119 sp -= 1; /* &argc */
122 120
123 current->mm->start_stack = (unsigned l 121 current->mm->start_stack = (unsigned long)sp & -FLAT_STACK_ALIGN;
124 sp = (unsigned long __user *)current-> 122 sp = (unsigned long __user *)current->mm->start_stack;
125 123
126 if (put_user(bprm->argc, sp++)) 124 if (put_user(bprm->argc, sp++))
127 return -EFAULT; 125 return -EFAULT;
128 if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGV 126 if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) {
129 unsigned long argv, envp; 127 unsigned long argv, envp;
130 argv = (unsigned long)(sp + 2) 128 argv = (unsigned long)(sp + 2);
131 envp = (unsigned long)(sp + 2 129 envp = (unsigned long)(sp + 2 + bprm->argc + 1);
132 if (put_user(argv, sp++) || pu 130 if (put_user(argv, sp++) || put_user(envp, sp++))
133 return -EFAULT; 131 return -EFAULT;
134 } 132 }
135 133
136 current->mm->arg_start = (unsigned lon 134 current->mm->arg_start = (unsigned long)p;
137 for (i = bprm->argc; i > 0; i--) { 135 for (i = bprm->argc; i > 0; i--) {
138 if (put_user((unsigned long)p, 136 if (put_user((unsigned long)p, sp++))
139 return -EFAULT; 137 return -EFAULT;
140 len = strnlen_user(p, MAX_ARG_ 138 len = strnlen_user(p, MAX_ARG_STRLEN);
141 if (!len || len > MAX_ARG_STRL 139 if (!len || len > MAX_ARG_STRLEN)
142 return -EINVAL; 140 return -EINVAL;
143 p += len; 141 p += len;
144 } 142 }
145 if (put_user(0, sp++)) 143 if (put_user(0, sp++))
146 return -EFAULT; 144 return -EFAULT;
147 current->mm->arg_end = (unsigned long) 145 current->mm->arg_end = (unsigned long)p;
148 146
149 current->mm->env_start = (unsigned lon 147 current->mm->env_start = (unsigned long) p;
150 for (i = bprm->envc; i > 0; i--) { 148 for (i = bprm->envc; i > 0; i--) {
151 if (put_user((unsigned long)p, 149 if (put_user((unsigned long)p, sp++))
152 return -EFAULT; 150 return -EFAULT;
153 len = strnlen_user(p, MAX_ARG_ 151 len = strnlen_user(p, MAX_ARG_STRLEN);
154 if (!len || len > MAX_ARG_STRL 152 if (!len || len > MAX_ARG_STRLEN)
155 return -EINVAL; 153 return -EINVAL;
156 p += len; 154 p += len;
157 } 155 }
158 if (put_user(0, sp++)) 156 if (put_user(0, sp++))
159 return -EFAULT; 157 return -EFAULT;
160 current->mm->env_end = (unsigned long) 158 current->mm->env_end = (unsigned long)p;
161 159
162 return 0; 160 return 0;
163 } 161 }
164 162
165 /********************************************* 163 /****************************************************************************/
166 164
167 #ifdef CONFIG_BINFMT_ZFLAT 165 #ifdef CONFIG_BINFMT_ZFLAT
168 166
169 #include <linux/zlib.h> 167 #include <linux/zlib.h>
170 168
171 #define LBUFSIZE 4000 169 #define LBUFSIZE 4000
172 170
173 /* gzip flag byte */ 171 /* gzip flag byte */
174 #define ASCII_FLAG 0x01 /* bit 0 set: file p 172 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
175 #define CONTINUATION 0x02 /* bit 1 set: contin 173 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
176 #define EXTRA_FIELD 0x04 /* bit 2 set: extra 174 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
177 #define ORIG_NAME 0x08 /* bit 3 set: origin 175 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
178 #define COMMENT 0x10 /* bit 4 set: file c 176 #define COMMENT 0x10 /* bit 4 set: file comment present */
179 #define ENCRYPTED 0x20 /* bit 5 set: file i 177 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
180 #define RESERVED 0xC0 /* bit 6,7: reserv 178 #define RESERVED 0xC0 /* bit 6,7: reserved */
181 179
182 static int decompress_exec(struct linux_binprm 180 static int decompress_exec(struct linux_binprm *bprm, loff_t fpos, char *dst,
183 long len, int fd) 181 long len, int fd)
184 { 182 {
185 unsigned char *buf; 183 unsigned char *buf;
186 z_stream strm; 184 z_stream strm;
187 int ret, retval; 185 int ret, retval;
188 186
189 pr_debug("decompress_exec(offset=%llx, 187 pr_debug("decompress_exec(offset=%llx,buf=%p,len=%lx)\n", fpos, dst, len);
190 188
191 memset(&strm, 0, sizeof(strm)); 189 memset(&strm, 0, sizeof(strm));
192 strm.workspace = kmalloc(zlib_inflate_ 190 strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
193 if (!strm.workspace) 191 if (!strm.workspace)
194 return -ENOMEM; 192 return -ENOMEM;
195 193
196 buf = kmalloc(LBUFSIZE, GFP_KERNEL); 194 buf = kmalloc(LBUFSIZE, GFP_KERNEL);
197 if (!buf) { 195 if (!buf) {
198 retval = -ENOMEM; 196 retval = -ENOMEM;
199 goto out_free; 197 goto out_free;
200 } 198 }
201 199
202 /* Read in first chunk of data and par 200 /* Read in first chunk of data and parse gzip header. */
203 ret = kernel_read(bprm->file, buf, LBU 201 ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos);
204 202
205 strm.next_in = buf; 203 strm.next_in = buf;
206 strm.avail_in = ret; 204 strm.avail_in = ret;
207 strm.total_in = 0; 205 strm.total_in = 0;
208 206
209 retval = -ENOEXEC; 207 retval = -ENOEXEC;
210 208
211 /* Check minimum size -- gzip header * 209 /* Check minimum size -- gzip header */
212 if (ret < 10) { 210 if (ret < 10) {
213 pr_debug("file too small?\n"); 211 pr_debug("file too small?\n");
214 goto out_free_buf; 212 goto out_free_buf;
215 } 213 }
216 214
217 /* Check gzip magic number */ 215 /* Check gzip magic number */
218 if ((buf[0] != 037) || ((buf[1] != 021 216 if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
219 pr_debug("unknown compression 217 pr_debug("unknown compression magic?\n");
220 goto out_free_buf; 218 goto out_free_buf;
221 } 219 }
222 220
223 /* Check gzip method */ 221 /* Check gzip method */
224 if (buf[2] != 8) { 222 if (buf[2] != 8) {
225 pr_debug("unknown compression 223 pr_debug("unknown compression method?\n");
226 goto out_free_buf; 224 goto out_free_buf;
227 } 225 }
228 /* Check gzip flags */ 226 /* Check gzip flags */
229 if ((buf[3] & ENCRYPTED) || (buf[3] & 227 if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
230 (buf[3] & RESERVED)) { 228 (buf[3] & RESERVED)) {
231 pr_debug("unknown flags?\n"); 229 pr_debug("unknown flags?\n");
232 goto out_free_buf; 230 goto out_free_buf;
233 } 231 }
234 232
235 ret = 10; 233 ret = 10;
236 if (buf[3] & EXTRA_FIELD) { 234 if (buf[3] & EXTRA_FIELD) {
237 ret += 2 + buf[10] + (buf[11] 235 ret += 2 + buf[10] + (buf[11] << 8);
238 if (unlikely(ret >= LBUFSIZE)) 236 if (unlikely(ret >= LBUFSIZE)) {
239 pr_debug("buffer overf 237 pr_debug("buffer overflow (EXTRA)?\n");
240 goto out_free_buf; 238 goto out_free_buf;
241 } 239 }
242 } 240 }
243 if (buf[3] & ORIG_NAME) { 241 if (buf[3] & ORIG_NAME) {
244 while (ret < LBUFSIZE && buf[r 242 while (ret < LBUFSIZE && buf[ret++] != 0)
245 ; 243 ;
246 if (unlikely(ret == LBUFSIZE)) 244 if (unlikely(ret == LBUFSIZE)) {
247 pr_debug("buffer overf 245 pr_debug("buffer overflow (ORIG_NAME)?\n");
248 goto out_free_buf; 246 goto out_free_buf;
249 } 247 }
250 } 248 }
251 if (buf[3] & COMMENT) { 249 if (buf[3] & COMMENT) {
252 while (ret < LBUFSIZE && buf[r 250 while (ret < LBUFSIZE && buf[ret++] != 0)
253 ; 251 ;
254 if (unlikely(ret == LBUFSIZE)) 252 if (unlikely(ret == LBUFSIZE)) {
255 pr_debug("buffer overf 253 pr_debug("buffer overflow (COMMENT)?\n");
256 goto out_free_buf; 254 goto out_free_buf;
257 } 255 }
258 } 256 }
259 257
260 strm.next_in += ret; 258 strm.next_in += ret;
261 strm.avail_in -= ret; 259 strm.avail_in -= ret;
262 260
263 strm.next_out = dst; 261 strm.next_out = dst;
264 strm.avail_out = len; 262 strm.avail_out = len;
265 strm.total_out = 0; 263 strm.total_out = 0;
266 264
267 if (zlib_inflateInit2(&strm, -MAX_WBIT 265 if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
268 pr_debug("zlib init failed?\n" 266 pr_debug("zlib init failed?\n");
269 goto out_free_buf; 267 goto out_free_buf;
270 } 268 }
271 269
272 while ((ret = zlib_inflate(&strm, Z_NO 270 while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
273 ret = kernel_read(bprm->file, 271 ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos);
274 if (ret <= 0) 272 if (ret <= 0)
275 break; 273 break;
276 len -= ret; 274 len -= ret;
277 275
278 strm.next_in = buf; 276 strm.next_in = buf;
279 strm.avail_in = ret; 277 strm.avail_in = ret;
280 strm.total_in = 0; 278 strm.total_in = 0;
281 } 279 }
282 280
283 if (ret < 0) { 281 if (ret < 0) {
284 pr_debug("decompression failed 282 pr_debug("decompression failed (%d), %s\n",
285 ret, strm.msg); 283 ret, strm.msg);
286 goto out_zlib; 284 goto out_zlib;
287 } 285 }
288 286
289 retval = 0; 287 retval = 0;
290 out_zlib: 288 out_zlib:
291 zlib_inflateEnd(&strm); 289 zlib_inflateEnd(&strm);
292 out_free_buf: 290 out_free_buf:
293 kfree(buf); 291 kfree(buf);
294 out_free: 292 out_free:
295 kfree(strm.workspace); 293 kfree(strm.workspace);
296 return retval; 294 return retval;
297 } 295 }
298 296
299 #endif /* CONFIG_BINFMT_ZFLAT */ 297 #endif /* CONFIG_BINFMT_ZFLAT */
300 298
301 /********************************************* 299 /****************************************************************************/
302 300
303 static unsigned long 301 static unsigned long
304 calc_reloc(unsigned long r, struct lib_info *p 302 calc_reloc(unsigned long r, struct lib_info *p)
305 { 303 {
306 unsigned long addr; 304 unsigned long addr;
307 unsigned long start_brk; 305 unsigned long start_brk;
308 unsigned long start_data; 306 unsigned long start_data;
309 unsigned long text_len; 307 unsigned long text_len;
310 unsigned long start_code; 308 unsigned long start_code;
311 309
312 start_brk = p->lib_list[0].start_brk; 310 start_brk = p->lib_list[0].start_brk;
313 start_data = p->lib_list[0].start_data 311 start_data = p->lib_list[0].start_data;
314 start_code = p->lib_list[0].start_code 312 start_code = p->lib_list[0].start_code;
315 text_len = p->lib_list[0].text_len; 313 text_len = p->lib_list[0].text_len;
316 314
317 if (r > start_brk - start_data + text_ 315 if (r > start_brk - start_data + text_len) {
318 pr_err("reloc outside program 316 pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)",
319 r, start_brk-start_data 317 r, start_brk-start_data+text_len, text_len);
320 goto failed; 318 goto failed;
321 } 319 }
322 320
323 if (r < text_len) 321 if (r < text_len) /* In text segment */
324 addr = r + start_code; 322 addr = r + start_code;
325 else 323 else /* In data segment */
326 addr = r - text_len + start_da 324 addr = r - text_len + start_data;
327 325
328 /* Range checked already above so doin 326 /* Range checked already above so doing the range tests is redundant...*/
329 return addr; 327 return addr;
330 328
331 failed: 329 failed:
332 pr_cont(", killing %s!\n", current->co 330 pr_cont(", killing %s!\n", current->comm);
333 send_sig(SIGSEGV, current, 0); 331 send_sig(SIGSEGV, current, 0);
334 332
335 return RELOC_FAILED; 333 return RELOC_FAILED;
336 } 334 }
337 335
338 /********************************************* 336 /****************************************************************************/
339 337
340 #ifdef CONFIG_BINFMT_FLAT_OLD 338 #ifdef CONFIG_BINFMT_FLAT_OLD
341 static void old_reloc(unsigned long rl) 339 static void old_reloc(unsigned long rl)
342 { 340 {
343 static const char *segment[] = { "TEXT 341 static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
344 flat_v2_reloc_t r; 342 flat_v2_reloc_t r;
345 unsigned long __user *ptr; 343 unsigned long __user *ptr;
346 unsigned long val; 344 unsigned long val;
347 345
348 r.value = rl; 346 r.value = rl;
349 #if defined(CONFIG_COLDFIRE) 347 #if defined(CONFIG_COLDFIRE)
350 ptr = (unsigned long __user *)(current 348 ptr = (unsigned long __user *)(current->mm->start_code + r.reloc.offset);
351 #else 349 #else
352 ptr = (unsigned long __user *)(current 350 ptr = (unsigned long __user *)(current->mm->start_data + r.reloc.offset);
353 #endif 351 #endif
354 get_user(val, ptr); 352 get_user(val, ptr);
355 353
356 pr_debug("Relocation of variable at DA 354 pr_debug("Relocation of variable at DATASEG+%x "
357 "(address %p, currently %lx) 355 "(address %p, currently %lx) into segment %s\n",
358 r.reloc.offset, ptr, val, seg 356 r.reloc.offset, ptr, val, segment[r.reloc.type]);
359 357
360 switch (r.reloc.type) { 358 switch (r.reloc.type) {
361 case OLD_FLAT_RELOC_TYPE_TEXT: 359 case OLD_FLAT_RELOC_TYPE_TEXT:
362 val += current->mm->start_code 360 val += current->mm->start_code;
363 break; 361 break;
364 case OLD_FLAT_RELOC_TYPE_DATA: 362 case OLD_FLAT_RELOC_TYPE_DATA:
365 val += current->mm->start_data 363 val += current->mm->start_data;
366 break; 364 break;
367 case OLD_FLAT_RELOC_TYPE_BSS: 365 case OLD_FLAT_RELOC_TYPE_BSS:
368 val += current->mm->end_data; 366 val += current->mm->end_data;
369 break; 367 break;
370 default: 368 default:
371 pr_err("Unknown relocation typ 369 pr_err("Unknown relocation type=%x\n", r.reloc.type);
372 break; 370 break;
373 } 371 }
374 put_user(val, ptr); 372 put_user(val, ptr);
375 373
376 pr_debug("Relocation became %lx\n", va 374 pr_debug("Relocation became %lx\n", val);
377 } 375 }
378 #endif /* CONFIG_BINFMT_FLAT_OLD */ 376 #endif /* CONFIG_BINFMT_FLAT_OLD */
379 377
380 /********************************************* 378 /****************************************************************************/
381 379
382 static inline u32 __user *skip_got_header(u32 380 static inline u32 __user *skip_got_header(u32 __user *rp)
383 { 381 {
384 if (IS_ENABLED(CONFIG_RISCV)) { 382 if (IS_ENABLED(CONFIG_RISCV)) {
385 /* 383 /*
386 * RISC-V has a 16 byte GOT PL 384 * RISC-V has a 16 byte GOT PLT header for elf64-riscv
387 * and 8 byte GOT PLT header f 385 * and 8 byte GOT PLT header for elf32-riscv.
388 * Skip the whole GOT PLT head 386 * Skip the whole GOT PLT header, since it is reserved
389 * for the dynamic linker (ld. 387 * for the dynamic linker (ld.so).
390 */ 388 */
391 u32 rp_val0, rp_val1; 389 u32 rp_val0, rp_val1;
392 390
393 if (get_user(rp_val0, rp)) 391 if (get_user(rp_val0, rp))
394 return rp; 392 return rp;
395 if (get_user(rp_val1, rp + 1)) 393 if (get_user(rp_val1, rp + 1))
396 return rp; 394 return rp;
397 395
398 if (rp_val0 == 0xffffffff && r 396 if (rp_val0 == 0xffffffff && rp_val1 == 0xffffffff)
399 rp += 4; 397 rp += 4;
400 else if (rp_val0 == 0xffffffff 398 else if (rp_val0 == 0xffffffff)
401 rp += 2; 399 rp += 2;
402 } 400 }
403 return rp; 401 return rp;
404 } 402 }
405 403
406 static int load_flat_file(struct linux_binprm 404 static int load_flat_file(struct linux_binprm *bprm,
407 struct lib_info *libinfo, unsi 405 struct lib_info *libinfo, unsigned long *extra_stack)
408 { 406 {
409 struct flat_hdr *hdr; 407 struct flat_hdr *hdr;
410 unsigned long textpos, datapos, realda 408 unsigned long textpos, datapos, realdatastart;
411 u32 text_len, data_len, bss_len, stack 409 u32 text_len, data_len, bss_len, stack_len, full_data, flags;
412 unsigned long len, memp, memp_size, ex 410 unsigned long len, memp, memp_size, extra, rlim;
413 __be32 __user *reloc; 411 __be32 __user *reloc;
414 u32 __user *rp; 412 u32 __user *rp;
415 int i, rev, relocs; 413 int i, rev, relocs;
416 loff_t fpos; 414 loff_t fpos;
417 unsigned long start_code, end_code; 415 unsigned long start_code, end_code;
418 ssize_t result; 416 ssize_t result;
419 int ret; 417 int ret;
420 418
421 hdr = ((struct flat_hdr *) bprm->buf); 419 hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
422 420
423 text_len = ntohl(hdr->data_start); 421 text_len = ntohl(hdr->data_start);
424 data_len = ntohl(hdr->data_end) - nto 422 data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start);
425 bss_len = ntohl(hdr->bss_end) - ntoh 423 bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
426 stack_len = ntohl(hdr->stack_size); 424 stack_len = ntohl(hdr->stack_size);
427 if (extra_stack) { 425 if (extra_stack) {
428 stack_len += *extra_stack; 426 stack_len += *extra_stack;
429 *extra_stack = stack_len; 427 *extra_stack = stack_len;
430 } 428 }
431 relocs = ntohl(hdr->reloc_count); 429 relocs = ntohl(hdr->reloc_count);
432 flags = ntohl(hdr->flags); 430 flags = ntohl(hdr->flags);
433 rev = ntohl(hdr->rev); 431 rev = ntohl(hdr->rev);
434 full_data = data_len + relocs * sizeof 432 full_data = data_len + relocs * sizeof(unsigned long);
435 433
436 if (strncmp(hdr->magic, "bFLT", 4)) { 434 if (strncmp(hdr->magic, "bFLT", 4)) {
437 /* 435 /*
438 * Previously, here was a prin 436 * Previously, here was a printk to tell people
439 * "BINFMT_FLAT: bad header 437 * "BINFMT_FLAT: bad header magic".
440 * But for the kernel which al 438 * But for the kernel which also use ELF FD-PIC format, this
441 * error message is confusing. 439 * error message is confusing.
442 * because a lot of people do 440 * because a lot of people do not manage to produce good
443 */ 441 */
444 ret = -ENOEXEC; 442 ret = -ENOEXEC;
445 goto err; 443 goto err;
446 } 444 }
447 445
448 if (flags & FLAT_FLAG_KTRACE) 446 if (flags & FLAT_FLAG_KTRACE)
449 pr_info("Loading file: %s\n", 447 pr_info("Loading file: %s\n", bprm->filename);
450 448
451 #ifdef CONFIG_BINFMT_FLAT_OLD 449 #ifdef CONFIG_BINFMT_FLAT_OLD
452 if (rev != FLAT_VERSION && rev != OLD_ 450 if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
453 pr_err("bad flat file version 451 pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n",
454 rev, FLAT_VERSION, OLD_ 452 rev, FLAT_VERSION, OLD_FLAT_VERSION);
455 ret = -ENOEXEC; 453 ret = -ENOEXEC;
456 goto err; 454 goto err;
457 } 455 }
458 456
459 /* 457 /*
460 * fix up the flags for the older form 458 * fix up the flags for the older format, there were all kinds
461 * of endian hacks, this only works f 459 * of endian hacks, this only works for the simple cases
462 */ 460 */
463 if (rev == OLD_FLAT_VERSION && 461 if (rev == OLD_FLAT_VERSION &&
464 (flags || IS_ENABLED(CONFIG_BINFMT_ 462 (flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM)))
465 flags = FLAT_FLAG_RAM; 463 flags = FLAT_FLAG_RAM;
466 464
467 #else /* CONFIG_BINFMT_FLAT_OLD */ 465 #else /* CONFIG_BINFMT_FLAT_OLD */
468 if (rev != FLAT_VERSION) { 466 if (rev != FLAT_VERSION) {
469 pr_err("bad flat file version 467 pr_err("bad flat file version 0x%x (supported 0x%lx)\n",
470 rev, FLAT_VERSION); 468 rev, FLAT_VERSION);
471 ret = -ENOEXEC; 469 ret = -ENOEXEC;
472 goto err; 470 goto err;
473 } 471 }
474 #endif /* !CONFIG_BINFMT_FLAT_OLD */ 472 #endif /* !CONFIG_BINFMT_FLAT_OLD */
475 473
476 /* 474 /*
477 * Make sure the header params are san 475 * Make sure the header params are sane.
478 * 28 bits (256 MB) is way more than r 476 * 28 bits (256 MB) is way more than reasonable in this case.
479 * If some top bits are set we have pr 477 * If some top bits are set we have probable binary corruption.
480 */ 478 */
481 if ((text_len | data_len | bss_len | s 479 if ((text_len | data_len | bss_len | stack_len | full_data) >> 28) {
482 pr_err("bad header\n"); 480 pr_err("bad header\n");
483 ret = -ENOEXEC; 481 ret = -ENOEXEC;
484 goto err; 482 goto err;
485 } 483 }
486 484
487 #ifndef CONFIG_BINFMT_ZFLAT 485 #ifndef CONFIG_BINFMT_ZFLAT
488 if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_ 486 if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
489 pr_err("Support for ZFLAT exec 487 pr_err("Support for ZFLAT executables is not enabled.\n");
490 ret = -ENOEXEC; 488 ret = -ENOEXEC;
491 goto err; 489 goto err;
492 } 490 }
493 #endif 491 #endif
494 492
495 /* 493 /*
496 * Check initial limits. This avoids l 494 * Check initial limits. This avoids letting people circumvent
497 * size limits imposed on them by crea 495 * size limits imposed on them by creating programs with large
498 * arrays in the data or bss. 496 * arrays in the data or bss.
499 */ 497 */
500 rlim = rlimit(RLIMIT_DATA); 498 rlim = rlimit(RLIMIT_DATA);
501 if (rlim >= RLIM_INFINITY) 499 if (rlim >= RLIM_INFINITY)
502 rlim = ~0; 500 rlim = ~0;
503 if (data_len + bss_len > rlim) { 501 if (data_len + bss_len > rlim) {
504 ret = -ENOMEM; 502 ret = -ENOMEM;
505 goto err; 503 goto err;
506 } 504 }
507 505
508 /* Flush all traces of the currently r 506 /* Flush all traces of the currently running executable */
509 ret = begin_new_exec(bprm); 507 ret = begin_new_exec(bprm);
510 if (ret) 508 if (ret)
511 goto err; 509 goto err;
512 510
513 /* OK, This is the point of no return 511 /* OK, This is the point of no return */
514 set_personality(PER_LINUX_32BIT); 512 set_personality(PER_LINUX_32BIT);
515 setup_new_exec(bprm); 513 setup_new_exec(bprm);
516 514
517 /* 515 /*
518 * calculate the extra space we need t 516 * calculate the extra space we need to map in
519 */ 517 */
520 extra = max_t(unsigned long, bss_len + 518 extra = max_t(unsigned long, bss_len + stack_len,
521 relocs * sizeof(unsign 519 relocs * sizeof(unsigned long));
522 520
523 /* 521 /*
524 * there are a couple of cases here, 522 * there are a couple of cases here, the separate code/data
525 * case, and then the fully copied to 523 * case, and then the fully copied to RAM case which lumps
526 * it all together. 524 * it all together.
527 */ 525 */
528 if (!IS_ENABLED(CONFIG_MMU) && !(flags 526 if (!IS_ENABLED(CONFIG_MMU) && !(flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP))) {
529 /* 527 /*
530 * this should give us a ROM p 528 * this should give us a ROM ptr, but if it doesn't we don't
531 * really care 529 * really care
532 */ 530 */
533 pr_debug("ROM mapping of file 531 pr_debug("ROM mapping of file (we hope)\n");
534 532
535 textpos = vm_mmap(bprm->file, 533 textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC,
536 MAP_PRIVATE, 534 MAP_PRIVATE, 0);
537 if (!textpos || IS_ERR_VALUE(t 535 if (!textpos || IS_ERR_VALUE(textpos)) {
538 ret = textpos; 536 ret = textpos;
539 if (!textpos) 537 if (!textpos)
540 ret = -ENOMEM; 538 ret = -ENOMEM;
541 pr_err("Unable to mmap 539 pr_err("Unable to mmap process text, errno %d\n", ret);
542 goto err; 540 goto err;
543 } 541 }
544 542
545 len = data_len + extra + 543 len = data_len + extra +
546 DATA_START_OFFSET_WORD 544 DATA_START_OFFSET_WORDS * sizeof(unsigned long);
547 len = PAGE_ALIGN(len); 545 len = PAGE_ALIGN(len);
548 realdatastart = vm_mmap(NULL, 546 realdatastart = vm_mmap(NULL, 0, len,
549 PROT_READ|PROT_WRITE|P 547 PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
550 548
551 if (realdatastart == 0 || IS_E 549 if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) {
552 ret = realdatastart; 550 ret = realdatastart;
553 if (!realdatastart) 551 if (!realdatastart)
554 ret = -ENOMEM; 552 ret = -ENOMEM;
555 pr_err("Unable to allo 553 pr_err("Unable to allocate RAM for process data, "
556 "errno %d\n", r 554 "errno %d\n", ret);
557 vm_munmap(textpos, tex 555 vm_munmap(textpos, text_len);
558 goto err; 556 goto err;
559 } 557 }
560 datapos = ALIGN(realdatastart 558 datapos = ALIGN(realdatastart +
561 DATA_START_OFF 559 DATA_START_OFFSET_WORDS * sizeof(unsigned long),
562 FLAT_DATA_ALIG 560 FLAT_DATA_ALIGN);
563 561
564 pr_debug("Allocated data+bss+s 562 pr_debug("Allocated data+bss+stack (%u bytes): %lx\n",
565 data_len + bss_len + 563 data_len + bss_len + stack_len, datapos);
566 564
567 fpos = ntohl(hdr->data_start); 565 fpos = ntohl(hdr->data_start);
568 #ifdef CONFIG_BINFMT_ZFLAT 566 #ifdef CONFIG_BINFMT_ZFLAT
569 if (flags & FLAT_FLAG_GZDATA) 567 if (flags & FLAT_FLAG_GZDATA) {
570 result = decompress_ex 568 result = decompress_exec(bprm, fpos, (char *)datapos,
571 569 full_data, 0);
572 } else 570 } else
573 #endif 571 #endif
574 { 572 {
575 result = read_code(bpr 573 result = read_code(bprm->file, datapos, fpos,
576 full_d 574 full_data);
577 } 575 }
578 if (IS_ERR_VALUE(result)) { 576 if (IS_ERR_VALUE(result)) {
579 ret = result; 577 ret = result;
580 pr_err("Unable to read 578 pr_err("Unable to read data+bss, errno %d\n", ret);
581 vm_munmap(textpos, tex 579 vm_munmap(textpos, text_len);
582 vm_munmap(realdatastar 580 vm_munmap(realdatastart, len);
583 goto err; 581 goto err;
584 } 582 }
585 583
586 reloc = (__be32 __user *) 584 reloc = (__be32 __user *)
587 (datapos + (ntohl(hdr- 585 (datapos + (ntohl(hdr->reloc_start) - text_len));
588 memp = realdatastart; 586 memp = realdatastart;
589 memp_size = len; 587 memp_size = len;
590 } else { 588 } else {
591 589
592 len = text_len + data_len + ex 590 len = text_len + data_len + extra +
593 DATA_START_OFFSET_WORD 591 DATA_START_OFFSET_WORDS * sizeof(u32);
594 len = PAGE_ALIGN(len); 592 len = PAGE_ALIGN(len);
595 textpos = vm_mmap(NULL, 0, len 593 textpos = vm_mmap(NULL, 0, len,
596 PROT_READ | PROT_EXEC 594 PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
597 595
598 if (!textpos || IS_ERR_VALUE(t 596 if (!textpos || IS_ERR_VALUE(textpos)) {
599 ret = textpos; 597 ret = textpos;
600 if (!textpos) 598 if (!textpos)
601 ret = -ENOMEM; 599 ret = -ENOMEM;
602 pr_err("Unable to allo 600 pr_err("Unable to allocate RAM for process text/data, "
603 "errno %d\n", r 601 "errno %d\n", ret);
604 goto err; 602 goto err;
605 } 603 }
606 604
607 realdatastart = textpos + ntoh 605 realdatastart = textpos + ntohl(hdr->data_start);
608 datapos = ALIGN(realdatastart 606 datapos = ALIGN(realdatastart +
609 DATA_START_OFF 607 DATA_START_OFFSET_WORDS * sizeof(u32),
610 FLAT_DATA_ALIG 608 FLAT_DATA_ALIGN);
611 609
612 reloc = (__be32 __user *) 610 reloc = (__be32 __user *)
613 (datapos + (ntohl(hdr- 611 (datapos + (ntohl(hdr->reloc_start) - text_len));
614 memp = textpos; 612 memp = textpos;
615 memp_size = len; 613 memp_size = len;
616 #ifdef CONFIG_BINFMT_ZFLAT 614 #ifdef CONFIG_BINFMT_ZFLAT
617 /* 615 /*
618 * load it all in and treat it 616 * load it all in and treat it like a RAM load from now on
619 */ 617 */
620 if (flags & FLAT_FLAG_GZIP) { 618 if (flags & FLAT_FLAG_GZIP) {
621 #ifndef CONFIG_MMU 619 #ifndef CONFIG_MMU
622 result = decompress_ex 620 result = decompress_exec(bprm, sizeof(struct flat_hdr),
623 (((ch 621 (((char *)textpos) + sizeof(struct flat_hdr)),
624 (text 622 (text_len + full_data
625 623 - sizeof(struct flat_hdr)),
626 0); 624 0);
627 memmove((void *) datap 625 memmove((void *) datapos, (void *) realdatastart,
628 full_d 626 full_data);
629 #else 627 #else
630 /* 628 /*
631 * This is used on MMU 629 * This is used on MMU systems mainly for testing.
632 * Let's use a kernel 630 * Let's use a kernel buffer to simplify things.
633 */ 631 */
634 long unz_text_len = te 632 long unz_text_len = text_len - sizeof(struct flat_hdr);
635 long unz_len = unz_tex 633 long unz_len = unz_text_len + full_data;
636 char *unz_data = vmall 634 char *unz_data = vmalloc(unz_len);
637 if (!unz_data) { 635 if (!unz_data) {
638 result = -ENOM 636 result = -ENOMEM;
639 } else { 637 } else {
640 result = decom 638 result = decompress_exec(bprm, sizeof(struct flat_hdr),
641 639 unz_data, unz_len, 0);
642 if (result == 640 if (result == 0 &&
643 (copy_to_u 641 (copy_to_user((void __user *)textpos + sizeof(struct flat_hdr),
644 642 unz_data, unz_text_len) ||
645 copy_to_u 643 copy_to_user((void __user *)datapos,
646 644 unz_data + unz_text_len, full_data)))
647 result 645 result = -EFAULT;
648 vfree(unz_data 646 vfree(unz_data);
649 } 647 }
650 #endif 648 #endif
651 } else if (flags & FLAT_FLAG_G 649 } else if (flags & FLAT_FLAG_GZDATA) {
652 result = read_code(bpr 650 result = read_code(bprm->file, textpos, 0, text_len);
653 if (!IS_ERR_VALUE(resu 651 if (!IS_ERR_VALUE(result)) {
654 #ifndef CONFIG_MMU 652 #ifndef CONFIG_MMU
655 result = decom 653 result = decompress_exec(bprm, text_len, (char *) datapos,
656 654 full_data, 0);
657 #else 655 #else
658 char *unz_data 656 char *unz_data = vmalloc(full_data);
659 if (!unz_data) 657 if (!unz_data) {
660 result 658 result = -ENOMEM;
661 } else { 659 } else {
662 result 660 result = decompress_exec(bprm, text_len,
663 661 unz_data, full_data, 0);
664 if (re 662 if (result == 0 &&
665 co 663 copy_to_user((void __user *)datapos,
666 664 unz_data, full_data))
667 665 result = -EFAULT;
668 vfree( 666 vfree(unz_data);
669 } 667 }
670 #endif 668 #endif
671 } 669 }
672 } else 670 } else
673 #endif /* CONFIG_BINFMT_ZFLAT */ 671 #endif /* CONFIG_BINFMT_ZFLAT */
674 { 672 {
675 result = read_code(bpr 673 result = read_code(bprm->file, textpos, 0, text_len);
676 if (!IS_ERR_VALUE(resu 674 if (!IS_ERR_VALUE(result))
677 result = read_ 675 result = read_code(bprm->file, datapos,
678 676 ntohl(hdr->data_start),
679 677 full_data);
680 } 678 }
681 if (IS_ERR_VALUE(result)) { 679 if (IS_ERR_VALUE(result)) {
682 ret = result; 680 ret = result;
683 pr_err("Unable to read 681 pr_err("Unable to read code+data+bss, errno %d\n", ret);
684 vm_munmap(textpos, tex 682 vm_munmap(textpos, text_len + data_len + extra +
685 DATA_START_O 683 DATA_START_OFFSET_WORDS * sizeof(u32));
686 goto err; 684 goto err;
687 } 685 }
688 } 686 }
689 687
690 start_code = textpos + sizeof(struct f 688 start_code = textpos + sizeof(struct flat_hdr);
691 end_code = textpos + text_len; 689 end_code = textpos + text_len;
692 text_len -= sizeof(struct flat_hdr); / 690 text_len -= sizeof(struct flat_hdr); /* the real code len */
693 691
694 /* The main program needs a little ext 692 /* The main program needs a little extra setup in the task structure */
695 current->mm->start_code = start_code; 693 current->mm->start_code = start_code;
696 current->mm->end_code = end_code; 694 current->mm->end_code = end_code;
697 current->mm->start_data = datapos; 695 current->mm->start_data = datapos;
698 current->mm->end_data = datapos + data 696 current->mm->end_data = datapos + data_len;
699 /* 697 /*
700 * set up the brk stuff, uses any slac 698 * set up the brk stuff, uses any slack left in data/bss/stack
701 * allocation. We put the brk after t 699 * allocation. We put the brk after the bss (between the bss
702 * and stack) like other platforms. 700 * and stack) like other platforms.
703 * Userspace code relies on the stack 701 * Userspace code relies on the stack pointer starting out at
704 * an address right at the end of a pa 702 * an address right at the end of a page.
705 */ 703 */
706 current->mm->start_brk = datapos + dat 704 current->mm->start_brk = datapos + data_len + bss_len;
707 current->mm->brk = (current->mm->start 705 current->mm->brk = (current->mm->start_brk + 3) & ~3;
708 #ifndef CONFIG_MMU 706 #ifndef CONFIG_MMU
709 current->mm->context.end_brk = memp + 707 current->mm->context.end_brk = memp + memp_size - stack_len;
710 #endif 708 #endif
711 709
712 if (flags & FLAT_FLAG_KTRACE) { 710 if (flags & FLAT_FLAG_KTRACE) {
713 pr_info("Mapping is %lx, Entry 711 pr_info("Mapping is %lx, Entry point is %x, data_start is %x\n",
714 textpos, 0x00ffffff&nt 712 textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start));
715 pr_info("%s %s: TEXT=%lx-%lx D 713 pr_info("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n",
716 "Load", bprm->filename 714 "Load", bprm->filename,
717 start_code, end_code, 715 start_code, end_code, datapos, datapos + data_len,
718 datapos + data_len, (d 716 datapos + data_len, (datapos + data_len + bss_len + 3) & ~3);
719 } 717 }
720 718
721 /* Store the current module values int 719 /* Store the current module values into the global library structure */
722 libinfo->lib_list[0].start_code = star 720 libinfo->lib_list[0].start_code = start_code;
723 libinfo->lib_list[0].start_data = data 721 libinfo->lib_list[0].start_data = datapos;
724 libinfo->lib_list[0].start_brk = datap 722 libinfo->lib_list[0].start_brk = datapos + data_len + bss_len;
725 libinfo->lib_list[0].text_len = text_l 723 libinfo->lib_list[0].text_len = text_len;
726 libinfo->lib_list[0].loaded = 1; 724 libinfo->lib_list[0].loaded = 1;
727 libinfo->lib_list[0].entry = (0x00ffff 725 libinfo->lib_list[0].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
728 libinfo->lib_list[0].build_date = ntoh 726 libinfo->lib_list[0].build_date = ntohl(hdr->build_date);
729 727
730 /* 728 /*
731 * We just load the allocations into s 729 * We just load the allocations into some temporary memory to
732 * help simplify all this mumbo jumbo 730 * help simplify all this mumbo jumbo
733 * 731 *
734 * We've got two different sections of 732 * We've got two different sections of relocation entries.
735 * The first is the GOT which resides 733 * The first is the GOT which resides at the beginning of the data segment
736 * and is terminated with a -1. This 734 * and is terminated with a -1. This one can be relocated in place.
737 * The second is the extra relocation 735 * The second is the extra relocation entries tacked after the image's
738 * data segment. These require a littl 736 * data segment. These require a little more processing as the entry is
739 * really an offset into the image whi 737 * really an offset into the image which contains an offset into the
740 * image. 738 * image.
741 */ 739 */
742 if (flags & FLAT_FLAG_GOTPIC) { 740 if (flags & FLAT_FLAG_GOTPIC) {
743 rp = skip_got_header((u32 __us 741 rp = skip_got_header((u32 __user *) datapos);
744 for (; ; rp++) { 742 for (; ; rp++) {
745 u32 addr, rp_val; 743 u32 addr, rp_val;
746 if (get_user(rp_val, r 744 if (get_user(rp_val, rp))
747 return -EFAULT 745 return -EFAULT;
748 if (rp_val == 0xffffff 746 if (rp_val == 0xffffffff)
749 break; 747 break;
750 if (rp_val) { 748 if (rp_val) {
751 addr = calc_re 749 addr = calc_reloc(rp_val, libinfo);
752 if (addr == RE 750 if (addr == RELOC_FAILED) {
753 ret = 751 ret = -ENOEXEC;
754 goto e 752 goto err;
755 } 753 }
756 if (put_user(a 754 if (put_user(addr, rp))
757 return 755 return -EFAULT;
758 } 756 }
759 } 757 }
760 } 758 }
761 759
762 /* 760 /*
763 * Now run through the relocation entr 761 * Now run through the relocation entries.
764 * We've got to be careful here as C++ 762 * We've got to be careful here as C++ produces relocatable zero
765 * entries in the constructor and dest 763 * entries in the constructor and destructor tables which are then
766 * tested for being not zero (which wi 764 * tested for being not zero (which will always occur unless we're
767 * based from address zero). This cau 765 * based from address zero). This causes an endless loop as __start
768 * is at zero. The solution used is t 766 * is at zero. The solution used is to not relocate zero addresses.
769 * This has the negative side effect o 767 * This has the negative side effect of not allowing a global data
770 * reference to be statically initiali 768 * reference to be statically initialised to _stext (I've moved
771 * __start to address 4 so that is oka 769 * __start to address 4 so that is okay).
772 */ 770 */
773 if (rev > OLD_FLAT_VERSION) { 771 if (rev > OLD_FLAT_VERSION) {
774 for (i = 0; i < relocs; i++) { 772 for (i = 0; i < relocs; i++) {
775 u32 addr, relval; 773 u32 addr, relval;
776 __be32 tmp; 774 __be32 tmp;
777 775
778 /* 776 /*
779 * Get the address of 777 * Get the address of the pointer to be
780 * relocated (of cours 778 * relocated (of course, the address has to be
781 * relocated first). 779 * relocated first).
782 */ 780 */
783 if (get_user(tmp, relo 781 if (get_user(tmp, reloc + i))
784 return -EFAULT 782 return -EFAULT;
785 relval = ntohl(tmp); 783 relval = ntohl(tmp);
786 addr = flat_get_reloca 784 addr = flat_get_relocate_addr(relval);
787 rp = (u32 __user *)cal 785 rp = (u32 __user *)calc_reloc(addr, libinfo);
788 if (rp == (u32 __user 786 if (rp == (u32 __user *)RELOC_FAILED) {
789 ret = -ENOEXEC 787 ret = -ENOEXEC;
790 goto err; 788 goto err;
791 } 789 }
792 790
793 /* Get the pointer's v 791 /* Get the pointer's value. */
794 ret = flat_get_addr_fr 792 ret = flat_get_addr_from_rp(rp, relval, flags, &addr);
795 if (unlikely(ret)) 793 if (unlikely(ret))
796 goto err; 794 goto err;
797 795
798 if (addr != 0) { 796 if (addr != 0) {
799 /* 797 /*
800 * Do the relo 798 * Do the relocation. PIC relocs in the data section are
801 * already in 799 * already in target order
802 */ 800 */
803 if ((flags & F 801 if ((flags & FLAT_FLAG_GOTPIC) == 0) {
804 /* 802 /*
805 * Meh 803 * Meh, the same value can have a different
806 * byt 804 * byte order based on a flag..
807 */ 805 */
808 addr = 806 addr = ntohl((__force __be32)addr);
809 } 807 }
810 addr = calc_re 808 addr = calc_reloc(addr, libinfo);
811 if (addr == RE 809 if (addr == RELOC_FAILED) {
812 ret = 810 ret = -ENOEXEC;
813 goto e 811 goto err;
814 } 812 }
815 813
816 /* Write back 814 /* Write back the relocated pointer. */
817 ret = flat_put 815 ret = flat_put_addr_at_rp(rp, addr, relval);
818 if (unlikely(r 816 if (unlikely(ret))
819 goto e 817 goto err;
820 } 818 }
821 } 819 }
822 #ifdef CONFIG_BINFMT_FLAT_OLD 820 #ifdef CONFIG_BINFMT_FLAT_OLD
823 } else { 821 } else {
824 for (i = 0; i < relocs; i++) { 822 for (i = 0; i < relocs; i++) {
825 __be32 relval; 823 __be32 relval;
826 if (get_user(relval, r 824 if (get_user(relval, reloc + i))
827 return -EFAULT 825 return -EFAULT;
828 old_reloc(ntohl(relval 826 old_reloc(ntohl(relval));
829 } 827 }
830 #endif /* CONFIG_BINFMT_FLAT_OLD */ 828 #endif /* CONFIG_BINFMT_FLAT_OLD */
831 } 829 }
832 830
833 flush_icache_user_range(start_code, en 831 flush_icache_user_range(start_code, end_code);
834 832
835 /* zero the BSS, BRK and stack areas 833 /* zero the BSS, BRK and stack areas */
836 if (clear_user((void __user *)(datapos 834 if (clear_user((void __user *)(datapos + data_len), bss_len +
837 (memp + memp_size - sta 835 (memp + memp_size - stack_len - /* end brk */
838 libinfo->lib_list[0].st 836 libinfo->lib_list[0].start_brk) + /* start brk */
839 stack_len)) 837 stack_len))
840 return -EFAULT; 838 return -EFAULT;
841 839
842 return 0; 840 return 0;
843 err: 841 err:
844 return ret; 842 return ret;
845 } 843 }
846 844
847 845
848 /********************************************* 846 /****************************************************************************/
849 847
850 /* 848 /*
851 * These are the functions used to load flat s 849 * These are the functions used to load flat style executables and shared
852 * libraries. There is no binary dependent co 850 * libraries. There is no binary dependent code anywhere else.
853 */ 851 */
854 852
855 static int load_flat_binary(struct linux_binpr 853 static int load_flat_binary(struct linux_binprm *bprm)
856 { 854 {
857 struct lib_info libinfo; 855 struct lib_info libinfo;
858 struct pt_regs *regs = current_pt_regs 856 struct pt_regs *regs = current_pt_regs();
859 unsigned long stack_len = 0; 857 unsigned long stack_len = 0;
860 unsigned long start_addr; 858 unsigned long start_addr;
861 int res; 859 int res;
862 int i, j; 860 int i, j;
863 861
864 memset(&libinfo, 0, sizeof(libinfo)); 862 memset(&libinfo, 0, sizeof(libinfo));
865 863
866 /* 864 /*
867 * We have to add the size of our argu 865 * We have to add the size of our arguments to our stack size
868 * otherwise it's too easy for users t 866 * otherwise it's too easy for users to create stack overflows
869 * by passing in a huge argument list. 867 * by passing in a huge argument list. And yes, we have to be
870 * pedantic and include space for the 868 * pedantic and include space for the argv/envp array as it may have
871 * a lot of entries. 869 * a lot of entries.
872 */ 870 */
873 #ifndef CONFIG_MMU 871 #ifndef CONFIG_MMU
874 stack_len += PAGE_SIZE * MAX_ARG_PAGES 872 stack_len += PAGE_SIZE * MAX_ARG_PAGES - bprm->p; /* the strings */
875 #endif 873 #endif
876 stack_len += (bprm->argc + 1) * sizeof 874 stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */
877 stack_len += (bprm->envc + 1) * sizeof 875 stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */
878 stack_len = ALIGN(stack_len, FLAT_STAC 876 stack_len = ALIGN(stack_len, FLAT_STACK_ALIGN);
879 877
880 res = load_flat_file(bprm, &libinfo, & 878 res = load_flat_file(bprm, &libinfo, &stack_len);
881 if (res < 0) 879 if (res < 0)
882 return res; 880 return res;
883 881
884 /* Update data segment pointers for al 882 /* Update data segment pointers for all libraries */
885 for (i = 0; i < MAX_SHARED_LIBS_UPDATE !! 883 for (i = 0; i < MAX_SHARED_LIBS; i++) {
886 if (!libinfo.lib_list[i].loade 884 if (!libinfo.lib_list[i].loaded)
887 continue; 885 continue;
888 for (j = 0; j < MAX_SHARED_LIB 886 for (j = 0; j < MAX_SHARED_LIBS; j++) {
889 unsigned long val = li 887 unsigned long val = libinfo.lib_list[j].loaded ?
890 libinfo.lib_li 888 libinfo.lib_list[j].start_data : UNLOADED_LIB;
891 unsigned long __user * 889 unsigned long __user *p = (unsigned long __user *)
892 libinfo.lib_li 890 libinfo.lib_list[i].start_data;
893 p -= j + 1; 891 p -= j + 1;
894 if (put_user(val, p)) 892 if (put_user(val, p))
895 return -EFAULT 893 return -EFAULT;
896 } 894 }
897 } 895 }
898 896
899 set_binfmt(&flat_format); 897 set_binfmt(&flat_format);
900 898
901 #ifdef CONFIG_MMU 899 #ifdef CONFIG_MMU
902 res = setup_arg_pages(bprm, STACK_TOP, 900 res = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
903 if (!res) 901 if (!res)
904 res = create_flat_tables(bprm, 902 res = create_flat_tables(bprm, bprm->p);
905 #else 903 #else
906 /* Stash our initial stack pointer int 904 /* Stash our initial stack pointer into the mm structure */
907 current->mm->start_stack = 905 current->mm->start_stack =
908 ((current->mm->context.end_brk 906 ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4;
909 pr_debug("sp=%lx\n", current->mm->star 907 pr_debug("sp=%lx\n", current->mm->start_stack);
910 908
911 /* copy the arg pages onto the stack * 909 /* copy the arg pages onto the stack */
912 res = transfer_args_to_stack(bprm, &cu 910 res = transfer_args_to_stack(bprm, ¤t->mm->start_stack);
913 if (!res) 911 if (!res)
914 res = create_flat_tables(bprm, 912 res = create_flat_tables(bprm, current->mm->start_stack);
915 #endif 913 #endif
916 if (res) 914 if (res)
917 return res; 915 return res;
918 916
919 /* Fake some return addresses to ensur 917 /* Fake some return addresses to ensure the call chain will
920 * initialise library in order for us. 918 * initialise library in order for us. We are required to call
921 * lib 1 first, then 2, ... and finall 919 * lib 1 first, then 2, ... and finally the main program (id 0).
922 */ 920 */
923 start_addr = libinfo.lib_list[0].entry 921 start_addr = libinfo.lib_list[0].entry;
924 922
925 #ifdef FLAT_PLAT_INIT 923 #ifdef FLAT_PLAT_INIT
926 FLAT_PLAT_INIT(regs); 924 FLAT_PLAT_INIT(regs);
927 #endif 925 #endif
928 926
929 finalize_exec(bprm); 927 finalize_exec(bprm);
930 pr_debug("start_thread(regs=0x%p, entr 928 pr_debug("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n",
931 regs, start_addr, current->mm 929 regs, start_addr, current->mm->start_stack);
932 start_thread(regs, start_addr, current 930 start_thread(regs, start_addr, current->mm->start_stack);
933 931
934 return 0; 932 return 0;
935 } 933 }
936 934
937 /********************************************* 935 /****************************************************************************/
938 936
939 static int __init init_flat_binfmt(void) 937 static int __init init_flat_binfmt(void)
940 { 938 {
941 register_binfmt(&flat_format); 939 register_binfmt(&flat_format);
942 return 0; 940 return 0;
943 } 941 }
944 core_initcall(init_flat_binfmt); 942 core_initcall(init_flat_binfmt);
945 943
946 /********************************************* 944 /****************************************************************************/
947 945
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