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 #ifdef CONFIG_BINFMT_SHARED_FLAT
72 !! 72 #define MAX_SHARED_LIBS (4)
73 #ifdef CONFIG_BINFMT_FLAT_NO_DATA_START_OFFSET <<
74 #define DATA_START_OFFSET_WORDS (0) <<
75 #define MAX_SHARED_LIBS_UPDATE (0) <<
76 #else 73 #else
77 #define DATA_START_OFFSET_WORDS (MAX_S !! 74 #define MAX_SHARED_LIBS (1)
78 #define MAX_SHARED_LIBS_UPDATE (MAX_S <<
79 #endif 75 #endif
80 76
81 struct lib_info { 77 struct lib_info {
82 struct { 78 struct {
83 unsigned long start_code; 79 unsigned long start_code; /* Start of text segment */
84 unsigned long start_data; 80 unsigned long start_data; /* Start of data segment */
85 unsigned long start_brk; 81 unsigned long start_brk; /* End of data segment */
86 unsigned long text_len; 82 unsigned long text_len; /* Length of text segment */
87 unsigned long entry; 83 unsigned long entry; /* Start address for this module */
88 unsigned long build_date; 84 unsigned long build_date; /* When this one was compiled */
89 bool loaded; 85 bool loaded; /* Has this library been loaded? */
90 } lib_list[MAX_SHARED_LIBS]; 86 } lib_list[MAX_SHARED_LIBS];
91 }; 87 };
92 88
>> 89 #ifdef CONFIG_BINFMT_SHARED_FLAT
>> 90 static int load_flat_shared_library(int id, struct lib_info *p);
>> 91 #endif
>> 92
93 static int load_flat_binary(struct linux_binpr 93 static int load_flat_binary(struct linux_binprm *);
>> 94 static int flat_core_dump(struct coredump_params *cprm);
94 95
95 static struct linux_binfmt flat_format = { 96 static struct linux_binfmt flat_format = {
96 .module = THIS_MODULE, 97 .module = THIS_MODULE,
97 .load_binary = load_flat_binary, 98 .load_binary = load_flat_binary,
>> 99 .core_dump = flat_core_dump,
>> 100 .min_coredump = PAGE_SIZE
98 }; 101 };
99 102
>> 103 /****************************************************************************/
>> 104 /*
>> 105 * Routine writes a core dump image in the current directory.
>> 106 * Currently only a stub-function.
>> 107 */
>> 108
>> 109 static int flat_core_dump(struct coredump_params *cprm)
>> 110 {
>> 111 pr_warn("Process %s:%d received signr %d and should have core dumped\n",
>> 112 current->comm, current->pid, cprm->siginfo->si_signo);
>> 113 return 1;
>> 114 }
100 115
101 /********************************************* 116 /****************************************************************************/
102 /* 117 /*
103 * create_flat_tables() parses the env- and ar 118 * create_flat_tables() parses the env- and arg-strings in new user
104 * memory and creates the pointer tables from 119 * memory and creates the pointer tables from them, and puts their
105 * addresses on the "stack", recording the new 120 * addresses on the "stack", recording the new stack pointer value.
106 */ 121 */
107 122
108 static int create_flat_tables(struct linux_bin 123 static int create_flat_tables(struct linux_binprm *bprm, unsigned long arg_start)
109 { 124 {
110 char __user *p; 125 char __user *p;
111 unsigned long __user *sp; 126 unsigned long __user *sp;
112 long i, len; 127 long i, len;
113 128
114 p = (char __user *)arg_start; 129 p = (char __user *)arg_start;
115 sp = (unsigned long __user *)current-> 130 sp = (unsigned long __user *)current->mm->start_stack;
116 131
117 sp -= bprm->envc + 1; 132 sp -= bprm->envc + 1;
118 sp -= bprm->argc + 1; 133 sp -= bprm->argc + 1;
119 if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGV 134 if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK))
120 sp -= 2; /* argvp + envp */ 135 sp -= 2; /* argvp + envp */
121 sp -= 1; /* &argc */ 136 sp -= 1; /* &argc */
122 137
123 current->mm->start_stack = (unsigned l 138 current->mm->start_stack = (unsigned long)sp & -FLAT_STACK_ALIGN;
124 sp = (unsigned long __user *)current-> 139 sp = (unsigned long __user *)current->mm->start_stack;
125 140
126 if (put_user(bprm->argc, sp++)) 141 if (put_user(bprm->argc, sp++))
127 return -EFAULT; 142 return -EFAULT;
128 if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGV 143 if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) {
129 unsigned long argv, envp; 144 unsigned long argv, envp;
130 argv = (unsigned long)(sp + 2) 145 argv = (unsigned long)(sp + 2);
131 envp = (unsigned long)(sp + 2 146 envp = (unsigned long)(sp + 2 + bprm->argc + 1);
132 if (put_user(argv, sp++) || pu 147 if (put_user(argv, sp++) || put_user(envp, sp++))
133 return -EFAULT; 148 return -EFAULT;
134 } 149 }
135 150
136 current->mm->arg_start = (unsigned lon 151 current->mm->arg_start = (unsigned long)p;
137 for (i = bprm->argc; i > 0; i--) { 152 for (i = bprm->argc; i > 0; i--) {
138 if (put_user((unsigned long)p, 153 if (put_user((unsigned long)p, sp++))
139 return -EFAULT; 154 return -EFAULT;
140 len = strnlen_user(p, MAX_ARG_ 155 len = strnlen_user(p, MAX_ARG_STRLEN);
141 if (!len || len > MAX_ARG_STRL 156 if (!len || len > MAX_ARG_STRLEN)
142 return -EINVAL; 157 return -EINVAL;
143 p += len; 158 p += len;
144 } 159 }
145 if (put_user(0, sp++)) 160 if (put_user(0, sp++))
146 return -EFAULT; 161 return -EFAULT;
147 current->mm->arg_end = (unsigned long) 162 current->mm->arg_end = (unsigned long)p;
148 163
149 current->mm->env_start = (unsigned lon 164 current->mm->env_start = (unsigned long) p;
150 for (i = bprm->envc; i > 0; i--) { 165 for (i = bprm->envc; i > 0; i--) {
151 if (put_user((unsigned long)p, 166 if (put_user((unsigned long)p, sp++))
152 return -EFAULT; 167 return -EFAULT;
153 len = strnlen_user(p, MAX_ARG_ 168 len = strnlen_user(p, MAX_ARG_STRLEN);
154 if (!len || len > MAX_ARG_STRL 169 if (!len || len > MAX_ARG_STRLEN)
155 return -EINVAL; 170 return -EINVAL;
156 p += len; 171 p += len;
157 } 172 }
158 if (put_user(0, sp++)) 173 if (put_user(0, sp++))
159 return -EFAULT; 174 return -EFAULT;
160 current->mm->env_end = (unsigned long) 175 current->mm->env_end = (unsigned long)p;
161 176
162 return 0; 177 return 0;
163 } 178 }
164 179
165 /********************************************* 180 /****************************************************************************/
166 181
167 #ifdef CONFIG_BINFMT_ZFLAT 182 #ifdef CONFIG_BINFMT_ZFLAT
168 183
169 #include <linux/zlib.h> 184 #include <linux/zlib.h>
170 185
171 #define LBUFSIZE 4000 186 #define LBUFSIZE 4000
172 187
173 /* gzip flag byte */ 188 /* gzip flag byte */
174 #define ASCII_FLAG 0x01 /* bit 0 set: file p 189 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
175 #define CONTINUATION 0x02 /* bit 1 set: contin 190 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
176 #define EXTRA_FIELD 0x04 /* bit 2 set: extra 191 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
177 #define ORIG_NAME 0x08 /* bit 3 set: origin 192 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
178 #define COMMENT 0x10 /* bit 4 set: file c 193 #define COMMENT 0x10 /* bit 4 set: file comment present */
179 #define ENCRYPTED 0x20 /* bit 5 set: file i 194 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
180 #define RESERVED 0xC0 /* bit 6,7: reserv 195 #define RESERVED 0xC0 /* bit 6,7: reserved */
181 196
182 static int decompress_exec(struct linux_binprm 197 static int decompress_exec(struct linux_binprm *bprm, loff_t fpos, char *dst,
183 long len, int fd) 198 long len, int fd)
184 { 199 {
185 unsigned char *buf; 200 unsigned char *buf;
186 z_stream strm; 201 z_stream strm;
187 int ret, retval; 202 int ret, retval;
188 203
189 pr_debug("decompress_exec(offset=%llx, 204 pr_debug("decompress_exec(offset=%llx,buf=%p,len=%lx)\n", fpos, dst, len);
190 205
191 memset(&strm, 0, sizeof(strm)); 206 memset(&strm, 0, sizeof(strm));
192 strm.workspace = kmalloc(zlib_inflate_ 207 strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
193 if (!strm.workspace) 208 if (!strm.workspace)
194 return -ENOMEM; 209 return -ENOMEM;
195 210
196 buf = kmalloc(LBUFSIZE, GFP_KERNEL); 211 buf = kmalloc(LBUFSIZE, GFP_KERNEL);
197 if (!buf) { 212 if (!buf) {
198 retval = -ENOMEM; 213 retval = -ENOMEM;
199 goto out_free; 214 goto out_free;
200 } 215 }
201 216
202 /* Read in first chunk of data and par 217 /* Read in first chunk of data and parse gzip header. */
203 ret = kernel_read(bprm->file, buf, LBU 218 ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos);
204 219
205 strm.next_in = buf; 220 strm.next_in = buf;
206 strm.avail_in = ret; 221 strm.avail_in = ret;
207 strm.total_in = 0; 222 strm.total_in = 0;
208 223
209 retval = -ENOEXEC; 224 retval = -ENOEXEC;
210 225
211 /* Check minimum size -- gzip header * 226 /* Check minimum size -- gzip header */
212 if (ret < 10) { 227 if (ret < 10) {
213 pr_debug("file too small?\n"); 228 pr_debug("file too small?\n");
214 goto out_free_buf; 229 goto out_free_buf;
215 } 230 }
216 231
217 /* Check gzip magic number */ 232 /* Check gzip magic number */
218 if ((buf[0] != 037) || ((buf[1] != 021 233 if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
219 pr_debug("unknown compression 234 pr_debug("unknown compression magic?\n");
220 goto out_free_buf; 235 goto out_free_buf;
221 } 236 }
222 237
223 /* Check gzip method */ 238 /* Check gzip method */
224 if (buf[2] != 8) { 239 if (buf[2] != 8) {
225 pr_debug("unknown compression 240 pr_debug("unknown compression method?\n");
226 goto out_free_buf; 241 goto out_free_buf;
227 } 242 }
228 /* Check gzip flags */ 243 /* Check gzip flags */
229 if ((buf[3] & ENCRYPTED) || (buf[3] & 244 if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
230 (buf[3] & RESERVED)) { 245 (buf[3] & RESERVED)) {
231 pr_debug("unknown flags?\n"); 246 pr_debug("unknown flags?\n");
232 goto out_free_buf; 247 goto out_free_buf;
233 } 248 }
234 249
235 ret = 10; 250 ret = 10;
236 if (buf[3] & EXTRA_FIELD) { 251 if (buf[3] & EXTRA_FIELD) {
237 ret += 2 + buf[10] + (buf[11] 252 ret += 2 + buf[10] + (buf[11] << 8);
238 if (unlikely(ret >= LBUFSIZE)) 253 if (unlikely(ret >= LBUFSIZE)) {
239 pr_debug("buffer overf 254 pr_debug("buffer overflow (EXTRA)?\n");
240 goto out_free_buf; 255 goto out_free_buf;
241 } 256 }
242 } 257 }
243 if (buf[3] & ORIG_NAME) { 258 if (buf[3] & ORIG_NAME) {
244 while (ret < LBUFSIZE && buf[r 259 while (ret < LBUFSIZE && buf[ret++] != 0)
245 ; 260 ;
246 if (unlikely(ret == LBUFSIZE)) 261 if (unlikely(ret == LBUFSIZE)) {
247 pr_debug("buffer overf 262 pr_debug("buffer overflow (ORIG_NAME)?\n");
248 goto out_free_buf; 263 goto out_free_buf;
249 } 264 }
250 } 265 }
251 if (buf[3] & COMMENT) { 266 if (buf[3] & COMMENT) {
252 while (ret < LBUFSIZE && buf[r 267 while (ret < LBUFSIZE && buf[ret++] != 0)
253 ; 268 ;
254 if (unlikely(ret == LBUFSIZE)) 269 if (unlikely(ret == LBUFSIZE)) {
255 pr_debug("buffer overf 270 pr_debug("buffer overflow (COMMENT)?\n");
256 goto out_free_buf; 271 goto out_free_buf;
257 } 272 }
258 } 273 }
259 274
260 strm.next_in += ret; 275 strm.next_in += ret;
261 strm.avail_in -= ret; 276 strm.avail_in -= ret;
262 277
263 strm.next_out = dst; 278 strm.next_out = dst;
264 strm.avail_out = len; 279 strm.avail_out = len;
265 strm.total_out = 0; 280 strm.total_out = 0;
266 281
267 if (zlib_inflateInit2(&strm, -MAX_WBIT 282 if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
268 pr_debug("zlib init failed?\n" 283 pr_debug("zlib init failed?\n");
269 goto out_free_buf; 284 goto out_free_buf;
270 } 285 }
271 286
272 while ((ret = zlib_inflate(&strm, Z_NO 287 while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
273 ret = kernel_read(bprm->file, 288 ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos);
274 if (ret <= 0) 289 if (ret <= 0)
275 break; 290 break;
276 len -= ret; 291 len -= ret;
277 292
278 strm.next_in = buf; 293 strm.next_in = buf;
279 strm.avail_in = ret; 294 strm.avail_in = ret;
280 strm.total_in = 0; 295 strm.total_in = 0;
281 } 296 }
282 297
283 if (ret < 0) { 298 if (ret < 0) {
284 pr_debug("decompression failed 299 pr_debug("decompression failed (%d), %s\n",
285 ret, strm.msg); 300 ret, strm.msg);
286 goto out_zlib; 301 goto out_zlib;
287 } 302 }
288 303
289 retval = 0; 304 retval = 0;
290 out_zlib: 305 out_zlib:
291 zlib_inflateEnd(&strm); 306 zlib_inflateEnd(&strm);
292 out_free_buf: 307 out_free_buf:
293 kfree(buf); 308 kfree(buf);
294 out_free: 309 out_free:
295 kfree(strm.workspace); 310 kfree(strm.workspace);
296 return retval; 311 return retval;
297 } 312 }
298 313
299 #endif /* CONFIG_BINFMT_ZFLAT */ 314 #endif /* CONFIG_BINFMT_ZFLAT */
300 315
301 /********************************************* 316 /****************************************************************************/
302 317
303 static unsigned long 318 static unsigned long
304 calc_reloc(unsigned long r, struct lib_info *p !! 319 calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp)
305 { 320 {
306 unsigned long addr; 321 unsigned long addr;
>> 322 int id;
307 unsigned long start_brk; 323 unsigned long start_brk;
308 unsigned long start_data; 324 unsigned long start_data;
309 unsigned long text_len; 325 unsigned long text_len;
310 unsigned long start_code; 326 unsigned long start_code;
311 327
312 start_brk = p->lib_list[0].start_brk; !! 328 #ifdef CONFIG_BINFMT_SHARED_FLAT
313 start_data = p->lib_list[0].start_data !! 329 if (r == 0)
314 start_code = p->lib_list[0].start_code !! 330 id = curid; /* Relocs of 0 are always self referring */
315 text_len = p->lib_list[0].text_len; !! 331 else {
>> 332 id = (r >> 24) & 0xff; /* Find ID for this reloc */
>> 333 r &= 0x00ffffff; /* Trim ID off here */
>> 334 }
>> 335 if (id >= MAX_SHARED_LIBS) {
>> 336 pr_err("reference 0x%lx to shared library %d", r, id);
>> 337 goto failed;
>> 338 }
>> 339 if (curid != id) {
>> 340 if (internalp) {
>> 341 pr_err("reloc address 0x%lx not in same module "
>> 342 "(%d != %d)", r, curid, id);
>> 343 goto failed;
>> 344 } else if (!p->lib_list[id].loaded &&
>> 345 load_flat_shared_library(id, p) < 0) {
>> 346 pr_err("failed to load library %d", id);
>> 347 goto failed;
>> 348 }
>> 349 /* Check versioning information (i.e. time stamps) */
>> 350 if (p->lib_list[id].build_date && p->lib_list[curid].build_date &&
>> 351 p->lib_list[curid].build_date < p->lib_list[id].build_date) {
>> 352 pr_err("library %d is younger than %d", id, curid);
>> 353 goto failed;
>> 354 }
>> 355 }
>> 356 #else
>> 357 id = 0;
>> 358 #endif
>> 359
>> 360 start_brk = p->lib_list[id].start_brk;
>> 361 start_data = p->lib_list[id].start_data;
>> 362 start_code = p->lib_list[id].start_code;
>> 363 text_len = p->lib_list[id].text_len;
316 364
317 if (r > start_brk - start_data + text_ 365 if (r > start_brk - start_data + text_len) {
318 pr_err("reloc outside program 366 pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)",
319 r, start_brk-start_data 367 r, start_brk-start_data+text_len, text_len);
320 goto failed; 368 goto failed;
321 } 369 }
322 370
323 if (r < text_len) 371 if (r < text_len) /* In text segment */
324 addr = r + start_code; 372 addr = r + start_code;
325 else 373 else /* In data segment */
326 addr = r - text_len + start_da 374 addr = r - text_len + start_data;
327 375
328 /* Range checked already above so doin 376 /* Range checked already above so doing the range tests is redundant...*/
329 return addr; 377 return addr;
330 378
331 failed: 379 failed:
332 pr_cont(", killing %s!\n", current->co 380 pr_cont(", killing %s!\n", current->comm);
333 send_sig(SIGSEGV, current, 0); 381 send_sig(SIGSEGV, current, 0);
334 382
335 return RELOC_FAILED; 383 return RELOC_FAILED;
336 } 384 }
337 385
338 /********************************************* 386 /****************************************************************************/
339 387
340 #ifdef CONFIG_BINFMT_FLAT_OLD 388 #ifdef CONFIG_BINFMT_FLAT_OLD
341 static void old_reloc(unsigned long rl) 389 static void old_reloc(unsigned long rl)
342 { 390 {
343 static const char *segment[] = { "TEXT 391 static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
344 flat_v2_reloc_t r; 392 flat_v2_reloc_t r;
345 unsigned long __user *ptr; 393 unsigned long __user *ptr;
346 unsigned long val; 394 unsigned long val;
347 395
348 r.value = rl; 396 r.value = rl;
349 #if defined(CONFIG_COLDFIRE) 397 #if defined(CONFIG_COLDFIRE)
350 ptr = (unsigned long __user *)(current 398 ptr = (unsigned long __user *)(current->mm->start_code + r.reloc.offset);
351 #else 399 #else
352 ptr = (unsigned long __user *)(current 400 ptr = (unsigned long __user *)(current->mm->start_data + r.reloc.offset);
353 #endif 401 #endif
354 get_user(val, ptr); 402 get_user(val, ptr);
355 403
356 pr_debug("Relocation of variable at DA 404 pr_debug("Relocation of variable at DATASEG+%x "
357 "(address %p, currently %lx) 405 "(address %p, currently %lx) into segment %s\n",
358 r.reloc.offset, ptr, val, seg 406 r.reloc.offset, ptr, val, segment[r.reloc.type]);
359 407
360 switch (r.reloc.type) { 408 switch (r.reloc.type) {
361 case OLD_FLAT_RELOC_TYPE_TEXT: 409 case OLD_FLAT_RELOC_TYPE_TEXT:
362 val += current->mm->start_code 410 val += current->mm->start_code;
363 break; 411 break;
364 case OLD_FLAT_RELOC_TYPE_DATA: 412 case OLD_FLAT_RELOC_TYPE_DATA:
365 val += current->mm->start_data 413 val += current->mm->start_data;
366 break; 414 break;
367 case OLD_FLAT_RELOC_TYPE_BSS: 415 case OLD_FLAT_RELOC_TYPE_BSS:
368 val += current->mm->end_data; 416 val += current->mm->end_data;
369 break; 417 break;
370 default: 418 default:
371 pr_err("Unknown relocation typ 419 pr_err("Unknown relocation type=%x\n", r.reloc.type);
372 break; 420 break;
373 } 421 }
374 put_user(val, ptr); 422 put_user(val, ptr);
375 423
376 pr_debug("Relocation became %lx\n", va 424 pr_debug("Relocation became %lx\n", val);
377 } 425 }
378 #endif /* CONFIG_BINFMT_FLAT_OLD */ 426 #endif /* CONFIG_BINFMT_FLAT_OLD */
379 427
380 /********************************************* 428 /****************************************************************************/
381 429
382 static inline u32 __user *skip_got_header(u32 <<
383 { <<
384 if (IS_ENABLED(CONFIG_RISCV)) { <<
385 /* <<
386 * RISC-V has a 16 byte GOT PL <<
387 * and 8 byte GOT PLT header f <<
388 * Skip the whole GOT PLT head <<
389 * for the dynamic linker (ld. <<
390 */ <<
391 u32 rp_val0, rp_val1; <<
392 <<
393 if (get_user(rp_val0, rp)) <<
394 return rp; <<
395 if (get_user(rp_val1, rp + 1)) <<
396 return rp; <<
397 <<
398 if (rp_val0 == 0xffffffff && r <<
399 rp += 4; <<
400 else if (rp_val0 == 0xffffffff <<
401 rp += 2; <<
402 } <<
403 return rp; <<
404 } <<
405 <<
406 static int load_flat_file(struct linux_binprm 430 static int load_flat_file(struct linux_binprm *bprm,
407 struct lib_info *libinfo, unsi !! 431 struct lib_info *libinfo, int id, unsigned long *extra_stack)
408 { 432 {
409 struct flat_hdr *hdr; 433 struct flat_hdr *hdr;
410 unsigned long textpos, datapos, realda 434 unsigned long textpos, datapos, realdatastart;
411 u32 text_len, data_len, bss_len, stack 435 u32 text_len, data_len, bss_len, stack_len, full_data, flags;
412 unsigned long len, memp, memp_size, ex 436 unsigned long len, memp, memp_size, extra, rlim;
413 __be32 __user *reloc; 437 __be32 __user *reloc;
414 u32 __user *rp; 438 u32 __user *rp;
415 int i, rev, relocs; 439 int i, rev, relocs;
416 loff_t fpos; 440 loff_t fpos;
417 unsigned long start_code, end_code; 441 unsigned long start_code, end_code;
418 ssize_t result; 442 ssize_t result;
419 int ret; 443 int ret;
420 444
421 hdr = ((struct flat_hdr *) bprm->buf); 445 hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
422 446
423 text_len = ntohl(hdr->data_start); 447 text_len = ntohl(hdr->data_start);
424 data_len = ntohl(hdr->data_end) - nto 448 data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start);
425 bss_len = ntohl(hdr->bss_end) - ntoh 449 bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
426 stack_len = ntohl(hdr->stack_size); 450 stack_len = ntohl(hdr->stack_size);
427 if (extra_stack) { 451 if (extra_stack) {
428 stack_len += *extra_stack; 452 stack_len += *extra_stack;
429 *extra_stack = stack_len; 453 *extra_stack = stack_len;
430 } 454 }
431 relocs = ntohl(hdr->reloc_count); 455 relocs = ntohl(hdr->reloc_count);
432 flags = ntohl(hdr->flags); 456 flags = ntohl(hdr->flags);
433 rev = ntohl(hdr->rev); 457 rev = ntohl(hdr->rev);
434 full_data = data_len + relocs * sizeof 458 full_data = data_len + relocs * sizeof(unsigned long);
435 459
436 if (strncmp(hdr->magic, "bFLT", 4)) { 460 if (strncmp(hdr->magic, "bFLT", 4)) {
437 /* 461 /*
438 * Previously, here was a prin 462 * Previously, here was a printk to tell people
439 * "BINFMT_FLAT: bad header 463 * "BINFMT_FLAT: bad header magic".
440 * But for the kernel which al 464 * But for the kernel which also use ELF FD-PIC format, this
441 * error message is confusing. 465 * error message is confusing.
442 * because a lot of people do 466 * because a lot of people do not manage to produce good
443 */ 467 */
444 ret = -ENOEXEC; 468 ret = -ENOEXEC;
445 goto err; 469 goto err;
446 } 470 }
447 471
448 if (flags & FLAT_FLAG_KTRACE) 472 if (flags & FLAT_FLAG_KTRACE)
449 pr_info("Loading file: %s\n", 473 pr_info("Loading file: %s\n", bprm->filename);
450 474
451 #ifdef CONFIG_BINFMT_FLAT_OLD 475 #ifdef CONFIG_BINFMT_FLAT_OLD
452 if (rev != FLAT_VERSION && rev != OLD_ 476 if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
453 pr_err("bad flat file version 477 pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n",
454 rev, FLAT_VERSION, OLD_ 478 rev, FLAT_VERSION, OLD_FLAT_VERSION);
455 ret = -ENOEXEC; 479 ret = -ENOEXEC;
456 goto err; 480 goto err;
457 } 481 }
458 482
>> 483 /* Don't allow old format executables to use shared libraries */
>> 484 if (rev == OLD_FLAT_VERSION && id != 0) {
>> 485 pr_err("shared libraries are not available before rev 0x%lx\n",
>> 486 FLAT_VERSION);
>> 487 ret = -ENOEXEC;
>> 488 goto err;
>> 489 }
>> 490
459 /* 491 /*
460 * fix up the flags for the older form 492 * fix up the flags for the older format, there were all kinds
461 * of endian hacks, this only works f 493 * of endian hacks, this only works for the simple cases
462 */ 494 */
463 if (rev == OLD_FLAT_VERSION && 495 if (rev == OLD_FLAT_VERSION &&
464 (flags || IS_ENABLED(CONFIG_BINFMT_ 496 (flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM)))
465 flags = FLAT_FLAG_RAM; 497 flags = FLAT_FLAG_RAM;
466 498
467 #else /* CONFIG_BINFMT_FLAT_OLD */ 499 #else /* CONFIG_BINFMT_FLAT_OLD */
468 if (rev != FLAT_VERSION) { 500 if (rev != FLAT_VERSION) {
469 pr_err("bad flat file version 501 pr_err("bad flat file version 0x%x (supported 0x%lx)\n",
470 rev, FLAT_VERSION); 502 rev, FLAT_VERSION);
471 ret = -ENOEXEC; 503 ret = -ENOEXEC;
472 goto err; 504 goto err;
473 } 505 }
474 #endif /* !CONFIG_BINFMT_FLAT_OLD */ 506 #endif /* !CONFIG_BINFMT_FLAT_OLD */
475 507
476 /* 508 /*
477 * Make sure the header params are san 509 * Make sure the header params are sane.
478 * 28 bits (256 MB) is way more than r 510 * 28 bits (256 MB) is way more than reasonable in this case.
479 * If some top bits are set we have pr 511 * If some top bits are set we have probable binary corruption.
480 */ 512 */
481 if ((text_len | data_len | bss_len | s 513 if ((text_len | data_len | bss_len | stack_len | full_data) >> 28) {
482 pr_err("bad header\n"); 514 pr_err("bad header\n");
483 ret = -ENOEXEC; 515 ret = -ENOEXEC;
484 goto err; 516 goto err;
485 } 517 }
486 518
487 #ifndef CONFIG_BINFMT_ZFLAT 519 #ifndef CONFIG_BINFMT_ZFLAT
488 if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_ 520 if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
489 pr_err("Support for ZFLAT exec 521 pr_err("Support for ZFLAT executables is not enabled.\n");
490 ret = -ENOEXEC; 522 ret = -ENOEXEC;
491 goto err; 523 goto err;
492 } 524 }
493 #endif 525 #endif
494 526
495 /* 527 /*
496 * Check initial limits. This avoids l 528 * Check initial limits. This avoids letting people circumvent
497 * size limits imposed on them by crea 529 * size limits imposed on them by creating programs with large
498 * arrays in the data or bss. 530 * arrays in the data or bss.
499 */ 531 */
500 rlim = rlimit(RLIMIT_DATA); 532 rlim = rlimit(RLIMIT_DATA);
501 if (rlim >= RLIM_INFINITY) 533 if (rlim >= RLIM_INFINITY)
502 rlim = ~0; 534 rlim = ~0;
503 if (data_len + bss_len > rlim) { 535 if (data_len + bss_len > rlim) {
504 ret = -ENOMEM; 536 ret = -ENOMEM;
505 goto err; 537 goto err;
506 } 538 }
507 539
508 /* Flush all traces of the currently r 540 /* Flush all traces of the currently running executable */
509 ret = begin_new_exec(bprm); !! 541 if (id == 0) {
510 if (ret) !! 542 ret = begin_new_exec(bprm);
511 goto err; !! 543 if (ret)
>> 544 goto err;
512 545
513 /* OK, This is the point of no return !! 546 /* OK, This is the point of no return */
514 set_personality(PER_LINUX_32BIT); !! 547 set_personality(PER_LINUX_32BIT);
515 setup_new_exec(bprm); !! 548 setup_new_exec(bprm);
>> 549 }
516 550
517 /* 551 /*
518 * calculate the extra space we need t 552 * calculate the extra space we need to map in
519 */ 553 */
520 extra = max_t(unsigned long, bss_len + 554 extra = max_t(unsigned long, bss_len + stack_len,
521 relocs * sizeof(unsign 555 relocs * sizeof(unsigned long));
522 556
523 /* 557 /*
524 * there are a couple of cases here, 558 * there are a couple of cases here, the separate code/data
525 * case, and then the fully copied to 559 * case, and then the fully copied to RAM case which lumps
526 * it all together. 560 * it all together.
527 */ 561 */
528 if (!IS_ENABLED(CONFIG_MMU) && !(flags 562 if (!IS_ENABLED(CONFIG_MMU) && !(flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP))) {
529 /* 563 /*
530 * this should give us a ROM p 564 * this should give us a ROM ptr, but if it doesn't we don't
531 * really care 565 * really care
532 */ 566 */
533 pr_debug("ROM mapping of file 567 pr_debug("ROM mapping of file (we hope)\n");
534 568
535 textpos = vm_mmap(bprm->file, 569 textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC,
536 MAP_PRIVATE, !! 570 MAP_PRIVATE|MAP_EXECUTABLE, 0);
537 if (!textpos || IS_ERR_VALUE(t 571 if (!textpos || IS_ERR_VALUE(textpos)) {
538 ret = textpos; 572 ret = textpos;
539 if (!textpos) 573 if (!textpos)
540 ret = -ENOMEM; 574 ret = -ENOMEM;
541 pr_err("Unable to mmap 575 pr_err("Unable to mmap process text, errno %d\n", ret);
542 goto err; 576 goto err;
543 } 577 }
544 578
545 len = data_len + extra + !! 579 len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long);
546 DATA_START_OFFSET_WORD <<
547 len = PAGE_ALIGN(len); 580 len = PAGE_ALIGN(len);
548 realdatastart = vm_mmap(NULL, 581 realdatastart = vm_mmap(NULL, 0, len,
549 PROT_READ|PROT_WRITE|P 582 PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0);
550 583
551 if (realdatastart == 0 || IS_E 584 if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) {
552 ret = realdatastart; 585 ret = realdatastart;
553 if (!realdatastart) 586 if (!realdatastart)
554 ret = -ENOMEM; 587 ret = -ENOMEM;
555 pr_err("Unable to allo 588 pr_err("Unable to allocate RAM for process data, "
556 "errno %d\n", r 589 "errno %d\n", ret);
557 vm_munmap(textpos, tex 590 vm_munmap(textpos, text_len);
558 goto err; 591 goto err;
559 } 592 }
560 datapos = ALIGN(realdatastart 593 datapos = ALIGN(realdatastart +
561 DATA_START_OFF !! 594 MAX_SHARED_LIBS * sizeof(unsigned long),
562 FLAT_DATA_ALIG 595 FLAT_DATA_ALIGN);
563 596
564 pr_debug("Allocated data+bss+s 597 pr_debug("Allocated data+bss+stack (%u bytes): %lx\n",
565 data_len + bss_len + 598 data_len + bss_len + stack_len, datapos);
566 599
567 fpos = ntohl(hdr->data_start); 600 fpos = ntohl(hdr->data_start);
568 #ifdef CONFIG_BINFMT_ZFLAT 601 #ifdef CONFIG_BINFMT_ZFLAT
569 if (flags & FLAT_FLAG_GZDATA) 602 if (flags & FLAT_FLAG_GZDATA) {
570 result = decompress_ex 603 result = decompress_exec(bprm, fpos, (char *)datapos,
571 604 full_data, 0);
572 } else 605 } else
573 #endif 606 #endif
574 { 607 {
575 result = read_code(bpr 608 result = read_code(bprm->file, datapos, fpos,
576 full_d 609 full_data);
577 } 610 }
578 if (IS_ERR_VALUE(result)) { 611 if (IS_ERR_VALUE(result)) {
579 ret = result; 612 ret = result;
580 pr_err("Unable to read 613 pr_err("Unable to read data+bss, errno %d\n", ret);
581 vm_munmap(textpos, tex 614 vm_munmap(textpos, text_len);
582 vm_munmap(realdatastar 615 vm_munmap(realdatastart, len);
583 goto err; 616 goto err;
584 } 617 }
585 618
586 reloc = (__be32 __user *) 619 reloc = (__be32 __user *)
587 (datapos + (ntohl(hdr- 620 (datapos + (ntohl(hdr->reloc_start) - text_len));
588 memp = realdatastart; 621 memp = realdatastart;
589 memp_size = len; 622 memp_size = len;
590 } else { 623 } else {
591 624
592 len = text_len + data_len + ex !! 625 len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(u32);
593 DATA_START_OFFSET_WORD <<
594 len = PAGE_ALIGN(len); 626 len = PAGE_ALIGN(len);
595 textpos = vm_mmap(NULL, 0, len 627 textpos = vm_mmap(NULL, 0, len,
596 PROT_READ | PROT_EXEC 628 PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0);
597 629
598 if (!textpos || IS_ERR_VALUE(t 630 if (!textpos || IS_ERR_VALUE(textpos)) {
599 ret = textpos; 631 ret = textpos;
600 if (!textpos) 632 if (!textpos)
601 ret = -ENOMEM; 633 ret = -ENOMEM;
602 pr_err("Unable to allo 634 pr_err("Unable to allocate RAM for process text/data, "
603 "errno %d\n", r 635 "errno %d\n", ret);
604 goto err; 636 goto err;
605 } 637 }
606 638
607 realdatastart = textpos + ntoh 639 realdatastart = textpos + ntohl(hdr->data_start);
608 datapos = ALIGN(realdatastart 640 datapos = ALIGN(realdatastart +
609 DATA_START_OFF !! 641 MAX_SHARED_LIBS * sizeof(u32),
610 FLAT_DATA_ALIG 642 FLAT_DATA_ALIGN);
611 643
612 reloc = (__be32 __user *) 644 reloc = (__be32 __user *)
613 (datapos + (ntohl(hdr- 645 (datapos + (ntohl(hdr->reloc_start) - text_len));
614 memp = textpos; 646 memp = textpos;
615 memp_size = len; 647 memp_size = len;
616 #ifdef CONFIG_BINFMT_ZFLAT 648 #ifdef CONFIG_BINFMT_ZFLAT
617 /* 649 /*
618 * load it all in and treat it 650 * load it all in and treat it like a RAM load from now on
619 */ 651 */
620 if (flags & FLAT_FLAG_GZIP) { 652 if (flags & FLAT_FLAG_GZIP) {
621 #ifndef CONFIG_MMU 653 #ifndef CONFIG_MMU
622 result = decompress_ex 654 result = decompress_exec(bprm, sizeof(struct flat_hdr),
623 (((ch 655 (((char *)textpos) + sizeof(struct flat_hdr)),
624 (text 656 (text_len + full_data
625 657 - sizeof(struct flat_hdr)),
626 0); 658 0);
627 memmove((void *) datap 659 memmove((void *) datapos, (void *) realdatastart,
628 full_d 660 full_data);
629 #else 661 #else
630 /* 662 /*
631 * This is used on MMU 663 * This is used on MMU systems mainly for testing.
632 * Let's use a kernel 664 * Let's use a kernel buffer to simplify things.
633 */ 665 */
634 long unz_text_len = te 666 long unz_text_len = text_len - sizeof(struct flat_hdr);
635 long unz_len = unz_tex 667 long unz_len = unz_text_len + full_data;
636 char *unz_data = vmall 668 char *unz_data = vmalloc(unz_len);
637 if (!unz_data) { 669 if (!unz_data) {
638 result = -ENOM 670 result = -ENOMEM;
639 } else { 671 } else {
640 result = decom 672 result = decompress_exec(bprm, sizeof(struct flat_hdr),
641 673 unz_data, unz_len, 0);
642 if (result == 674 if (result == 0 &&
643 (copy_to_u 675 (copy_to_user((void __user *)textpos + sizeof(struct flat_hdr),
644 676 unz_data, unz_text_len) ||
645 copy_to_u 677 copy_to_user((void __user *)datapos,
646 678 unz_data + unz_text_len, full_data)))
647 result 679 result = -EFAULT;
648 vfree(unz_data 680 vfree(unz_data);
649 } 681 }
650 #endif 682 #endif
651 } else if (flags & FLAT_FLAG_G 683 } else if (flags & FLAT_FLAG_GZDATA) {
652 result = read_code(bpr 684 result = read_code(bprm->file, textpos, 0, text_len);
653 if (!IS_ERR_VALUE(resu 685 if (!IS_ERR_VALUE(result)) {
654 #ifndef CONFIG_MMU 686 #ifndef CONFIG_MMU
655 result = decom 687 result = decompress_exec(bprm, text_len, (char *) datapos,
656 688 full_data, 0);
657 #else 689 #else
658 char *unz_data 690 char *unz_data = vmalloc(full_data);
659 if (!unz_data) 691 if (!unz_data) {
660 result 692 result = -ENOMEM;
661 } else { 693 } else {
662 result 694 result = decompress_exec(bprm, text_len,
663 695 unz_data, full_data, 0);
664 if (re 696 if (result == 0 &&
665 co 697 copy_to_user((void __user *)datapos,
666 698 unz_data, full_data))
667 699 result = -EFAULT;
668 vfree( 700 vfree(unz_data);
669 } 701 }
670 #endif 702 #endif
671 } 703 }
672 } else 704 } else
673 #endif /* CONFIG_BINFMT_ZFLAT */ 705 #endif /* CONFIG_BINFMT_ZFLAT */
674 { 706 {
675 result = read_code(bpr 707 result = read_code(bprm->file, textpos, 0, text_len);
676 if (!IS_ERR_VALUE(resu 708 if (!IS_ERR_VALUE(result))
677 result = read_ 709 result = read_code(bprm->file, datapos,
678 710 ntohl(hdr->data_start),
679 711 full_data);
680 } 712 }
681 if (IS_ERR_VALUE(result)) { 713 if (IS_ERR_VALUE(result)) {
682 ret = result; 714 ret = result;
683 pr_err("Unable to read 715 pr_err("Unable to read code+data+bss, errno %d\n", ret);
684 vm_munmap(textpos, tex 716 vm_munmap(textpos, text_len + data_len + extra +
685 DATA_START_O !! 717 MAX_SHARED_LIBS * sizeof(u32));
686 goto err; 718 goto err;
687 } 719 }
688 } 720 }
689 721
690 start_code = textpos + sizeof(struct f 722 start_code = textpos + sizeof(struct flat_hdr);
691 end_code = textpos + text_len; 723 end_code = textpos + text_len;
692 text_len -= sizeof(struct flat_hdr); / 724 text_len -= sizeof(struct flat_hdr); /* the real code len */
693 725
694 /* The main program needs a little ext 726 /* The main program needs a little extra setup in the task structure */
695 current->mm->start_code = start_code; !! 727 if (id == 0) {
696 current->mm->end_code = end_code; !! 728 current->mm->start_code = start_code;
697 current->mm->start_data = datapos; !! 729 current->mm->end_code = end_code;
698 current->mm->end_data = datapos + data !! 730 current->mm->start_data = datapos;
699 /* !! 731 current->mm->end_data = datapos + data_len;
700 * set up the brk stuff, uses any slac !! 732 /*
701 * allocation. We put the brk after t !! 733 * set up the brk stuff, uses any slack left in data/bss/stack
702 * and stack) like other platforms. !! 734 * allocation. We put the brk after the bss (between the bss
703 * Userspace code relies on the stack !! 735 * and stack) like other platforms.
704 * an address right at the end of a pa !! 736 * Userspace code relies on the stack pointer starting out at
705 */ !! 737 * an address right at the end of a page.
706 current->mm->start_brk = datapos + dat !! 738 */
707 current->mm->brk = (current->mm->start !! 739 current->mm->start_brk = datapos + data_len + bss_len;
>> 740 current->mm->brk = (current->mm->start_brk + 3) & ~3;
708 #ifndef CONFIG_MMU 741 #ifndef CONFIG_MMU
709 current->mm->context.end_brk = memp + !! 742 current->mm->context.end_brk = memp + memp_size - stack_len;
710 #endif 743 #endif
>> 744 }
711 745
712 if (flags & FLAT_FLAG_KTRACE) { 746 if (flags & FLAT_FLAG_KTRACE) {
713 pr_info("Mapping is %lx, Entry 747 pr_info("Mapping is %lx, Entry point is %x, data_start is %x\n",
714 textpos, 0x00ffffff&nt 748 textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start));
715 pr_info("%s %s: TEXT=%lx-%lx D 749 pr_info("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n",
716 "Load", bprm->filename !! 750 id ? "Lib" : "Load", bprm->filename,
717 start_code, end_code, 751 start_code, end_code, datapos, datapos + data_len,
718 datapos + data_len, (d 752 datapos + data_len, (datapos + data_len + bss_len + 3) & ~3);
719 } 753 }
720 754
721 /* Store the current module values int 755 /* Store the current module values into the global library structure */
722 libinfo->lib_list[0].start_code = star !! 756 libinfo->lib_list[id].start_code = start_code;
723 libinfo->lib_list[0].start_data = data !! 757 libinfo->lib_list[id].start_data = datapos;
724 libinfo->lib_list[0].start_brk = datap !! 758 libinfo->lib_list[id].start_brk = datapos + data_len + bss_len;
725 libinfo->lib_list[0].text_len = text_l !! 759 libinfo->lib_list[id].text_len = text_len;
726 libinfo->lib_list[0].loaded = 1; !! 760 libinfo->lib_list[id].loaded = 1;
727 libinfo->lib_list[0].entry = (0x00ffff !! 761 libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
728 libinfo->lib_list[0].build_date = ntoh !! 762 libinfo->lib_list[id].build_date = ntohl(hdr->build_date);
729 763
730 /* 764 /*
731 * We just load the allocations into s 765 * We just load the allocations into some temporary memory to
732 * help simplify all this mumbo jumbo 766 * help simplify all this mumbo jumbo
733 * 767 *
734 * We've got two different sections of 768 * We've got two different sections of relocation entries.
735 * The first is the GOT which resides 769 * The first is the GOT which resides at the beginning of the data segment
736 * and is terminated with a -1. This 770 * and is terminated with a -1. This one can be relocated in place.
737 * The second is the extra relocation 771 * The second is the extra relocation entries tacked after the image's
738 * data segment. These require a littl 772 * data segment. These require a little more processing as the entry is
739 * really an offset into the image whi 773 * really an offset into the image which contains an offset into the
740 * image. 774 * image.
741 */ 775 */
742 if (flags & FLAT_FLAG_GOTPIC) { 776 if (flags & FLAT_FLAG_GOTPIC) {
743 rp = skip_got_header((u32 __us !! 777 for (rp = (u32 __user *)datapos; ; rp++) {
744 for (; ; rp++) { <<
745 u32 addr, rp_val; 778 u32 addr, rp_val;
746 if (get_user(rp_val, r 779 if (get_user(rp_val, rp))
747 return -EFAULT 780 return -EFAULT;
748 if (rp_val == 0xffffff 781 if (rp_val == 0xffffffff)
749 break; 782 break;
750 if (rp_val) { 783 if (rp_val) {
751 addr = calc_re !! 784 addr = calc_reloc(rp_val, libinfo, id, 0);
752 if (addr == RE 785 if (addr == RELOC_FAILED) {
753 ret = 786 ret = -ENOEXEC;
754 goto e 787 goto err;
755 } 788 }
756 if (put_user(a 789 if (put_user(addr, rp))
757 return 790 return -EFAULT;
758 } 791 }
759 } 792 }
760 } 793 }
761 794
762 /* 795 /*
763 * Now run through the relocation entr 796 * Now run through the relocation entries.
764 * We've got to be careful here as C++ 797 * We've got to be careful here as C++ produces relocatable zero
765 * entries in the constructor and dest 798 * entries in the constructor and destructor tables which are then
766 * tested for being not zero (which wi 799 * tested for being not zero (which will always occur unless we're
767 * based from address zero). This cau 800 * based from address zero). This causes an endless loop as __start
768 * is at zero. The solution used is t 801 * is at zero. The solution used is to not relocate zero addresses.
769 * This has the negative side effect o 802 * This has the negative side effect of not allowing a global data
770 * reference to be statically initiali 803 * reference to be statically initialised to _stext (I've moved
771 * __start to address 4 so that is oka 804 * __start to address 4 so that is okay).
772 */ 805 */
773 if (rev > OLD_FLAT_VERSION) { 806 if (rev > OLD_FLAT_VERSION) {
774 for (i = 0; i < relocs; i++) { 807 for (i = 0; i < relocs; i++) {
775 u32 addr, relval; 808 u32 addr, relval;
776 __be32 tmp; 809 __be32 tmp;
777 810
778 /* 811 /*
779 * Get the address of 812 * Get the address of the pointer to be
780 * relocated (of cours 813 * relocated (of course, the address has to be
781 * relocated first). 814 * relocated first).
782 */ 815 */
783 if (get_user(tmp, relo 816 if (get_user(tmp, reloc + i))
784 return -EFAULT 817 return -EFAULT;
785 relval = ntohl(tmp); 818 relval = ntohl(tmp);
786 addr = flat_get_reloca 819 addr = flat_get_relocate_addr(relval);
787 rp = (u32 __user *)cal !! 820 rp = (u32 __user *)calc_reloc(addr, libinfo, id, 1);
788 if (rp == (u32 __user 821 if (rp == (u32 __user *)RELOC_FAILED) {
789 ret = -ENOEXEC 822 ret = -ENOEXEC;
790 goto err; 823 goto err;
791 } 824 }
792 825
793 /* Get the pointer's v 826 /* Get the pointer's value. */
794 ret = flat_get_addr_fr 827 ret = flat_get_addr_from_rp(rp, relval, flags, &addr);
795 if (unlikely(ret)) 828 if (unlikely(ret))
796 goto err; 829 goto err;
797 830
798 if (addr != 0) { 831 if (addr != 0) {
799 /* 832 /*
800 * Do the relo 833 * Do the relocation. PIC relocs in the data section are
801 * already in 834 * already in target order
802 */ 835 */
803 if ((flags & F 836 if ((flags & FLAT_FLAG_GOTPIC) == 0) {
804 /* 837 /*
805 * Meh 838 * Meh, the same value can have a different
806 * byt 839 * byte order based on a flag..
807 */ 840 */
808 addr = 841 addr = ntohl((__force __be32)addr);
809 } 842 }
810 addr = calc_re !! 843 addr = calc_reloc(addr, libinfo, id, 0);
811 if (addr == RE 844 if (addr == RELOC_FAILED) {
812 ret = 845 ret = -ENOEXEC;
813 goto e 846 goto err;
814 } 847 }
815 848
816 /* Write back 849 /* Write back the relocated pointer. */
817 ret = flat_put 850 ret = flat_put_addr_at_rp(rp, addr, relval);
818 if (unlikely(r 851 if (unlikely(ret))
819 goto e 852 goto err;
820 } 853 }
821 } 854 }
822 #ifdef CONFIG_BINFMT_FLAT_OLD 855 #ifdef CONFIG_BINFMT_FLAT_OLD
823 } else { 856 } else {
824 for (i = 0; i < relocs; i++) { 857 for (i = 0; i < relocs; i++) {
825 __be32 relval; 858 __be32 relval;
826 if (get_user(relval, r 859 if (get_user(relval, reloc + i))
827 return -EFAULT 860 return -EFAULT;
828 old_reloc(ntohl(relval 861 old_reloc(ntohl(relval));
829 } 862 }
830 #endif /* CONFIG_BINFMT_FLAT_OLD */ 863 #endif /* CONFIG_BINFMT_FLAT_OLD */
831 } 864 }
832 865
833 flush_icache_user_range(start_code, en 866 flush_icache_user_range(start_code, end_code);
834 867
835 /* zero the BSS, BRK and stack areas 868 /* zero the BSS, BRK and stack areas */
836 if (clear_user((void __user *)(datapos 869 if (clear_user((void __user *)(datapos + data_len), bss_len +
837 (memp + memp_size - sta 870 (memp + memp_size - stack_len - /* end brk */
838 libinfo->lib_list[0].st !! 871 libinfo->lib_list[id].start_brk) + /* start brk */
839 stack_len)) 872 stack_len))
840 return -EFAULT; 873 return -EFAULT;
841 874
842 return 0; 875 return 0;
843 err: 876 err:
844 return ret; 877 return ret;
845 } 878 }
846 879
847 880
848 /********************************************* 881 /****************************************************************************/
>> 882 #ifdef CONFIG_BINFMT_SHARED_FLAT
>> 883
>> 884 /*
>> 885 * Load a shared library into memory. The library gets its own data
>> 886 * segment (including bss) but not argv/argc/environ.
>> 887 */
>> 888
>> 889 static int load_flat_shared_library(int id, struct lib_info *libs)
>> 890 {
>> 891 /*
>> 892 * This is a fake bprm struct; only the members "buf", "file" and
>> 893 * "filename" are actually used.
>> 894 */
>> 895 struct linux_binprm bprm;
>> 896 int res;
>> 897 char buf[16];
>> 898 loff_t pos = 0;
>> 899
>> 900 memset(&bprm, 0, sizeof(bprm));
>> 901
>> 902 /* Create the file name */
>> 903 sprintf(buf, "/lib/lib%d.so", id);
>> 904
>> 905 /* Open the file up */
>> 906 bprm.filename = buf;
>> 907 bprm.file = open_exec(bprm.filename);
>> 908 res = PTR_ERR(bprm.file);
>> 909 if (IS_ERR(bprm.file))
>> 910 return res;
>> 911
>> 912 res = kernel_read(bprm.file, bprm.buf, BINPRM_BUF_SIZE, &pos);
>> 913
>> 914 if (res >= 0)
>> 915 res = load_flat_file(&bprm, libs, id, NULL);
>> 916
>> 917 allow_write_access(bprm.file);
>> 918 fput(bprm.file);
>> 919
>> 920 return res;
>> 921 }
>> 922
>> 923 #endif /* CONFIG_BINFMT_SHARED_FLAT */
>> 924 /****************************************************************************/
849 925
850 /* 926 /*
851 * These are the functions used to load flat s 927 * These are the functions used to load flat style executables and shared
852 * libraries. There is no binary dependent co 928 * libraries. There is no binary dependent code anywhere else.
853 */ 929 */
854 930
855 static int load_flat_binary(struct linux_binpr 931 static int load_flat_binary(struct linux_binprm *bprm)
856 { 932 {
857 struct lib_info libinfo; 933 struct lib_info libinfo;
858 struct pt_regs *regs = current_pt_regs 934 struct pt_regs *regs = current_pt_regs();
859 unsigned long stack_len = 0; 935 unsigned long stack_len = 0;
860 unsigned long start_addr; 936 unsigned long start_addr;
861 int res; 937 int res;
862 int i, j; 938 int i, j;
863 939
864 memset(&libinfo, 0, sizeof(libinfo)); 940 memset(&libinfo, 0, sizeof(libinfo));
865 941
866 /* 942 /*
867 * We have to add the size of our argu 943 * We have to add the size of our arguments to our stack size
868 * otherwise it's too easy for users t 944 * otherwise it's too easy for users to create stack overflows
869 * by passing in a huge argument list. 945 * by passing in a huge argument list. And yes, we have to be
870 * pedantic and include space for the 946 * pedantic and include space for the argv/envp array as it may have
871 * a lot of entries. 947 * a lot of entries.
872 */ 948 */
873 #ifndef CONFIG_MMU 949 #ifndef CONFIG_MMU
874 stack_len += PAGE_SIZE * MAX_ARG_PAGES 950 stack_len += PAGE_SIZE * MAX_ARG_PAGES - bprm->p; /* the strings */
875 #endif 951 #endif
876 stack_len += (bprm->argc + 1) * sizeof 952 stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */
877 stack_len += (bprm->envc + 1) * sizeof 953 stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */
878 stack_len = ALIGN(stack_len, FLAT_STAC 954 stack_len = ALIGN(stack_len, FLAT_STACK_ALIGN);
879 955
880 res = load_flat_file(bprm, &libinfo, & !! 956 res = load_flat_file(bprm, &libinfo, 0, &stack_len);
881 if (res < 0) 957 if (res < 0)
882 return res; 958 return res;
883 959
884 /* Update data segment pointers for al 960 /* Update data segment pointers for all libraries */
885 for (i = 0; i < MAX_SHARED_LIBS_UPDATE !! 961 for (i = 0; i < MAX_SHARED_LIBS; i++) {
886 if (!libinfo.lib_list[i].loade 962 if (!libinfo.lib_list[i].loaded)
887 continue; 963 continue;
888 for (j = 0; j < MAX_SHARED_LIB 964 for (j = 0; j < MAX_SHARED_LIBS; j++) {
889 unsigned long val = li 965 unsigned long val = libinfo.lib_list[j].loaded ?
890 libinfo.lib_li 966 libinfo.lib_list[j].start_data : UNLOADED_LIB;
891 unsigned long __user * 967 unsigned long __user *p = (unsigned long __user *)
892 libinfo.lib_li 968 libinfo.lib_list[i].start_data;
893 p -= j + 1; 969 p -= j + 1;
894 if (put_user(val, p)) 970 if (put_user(val, p))
895 return -EFAULT 971 return -EFAULT;
896 } 972 }
897 } 973 }
898 974
899 set_binfmt(&flat_format); 975 set_binfmt(&flat_format);
900 976
901 #ifdef CONFIG_MMU 977 #ifdef CONFIG_MMU
902 res = setup_arg_pages(bprm, STACK_TOP, 978 res = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT);
903 if (!res) 979 if (!res)
904 res = create_flat_tables(bprm, 980 res = create_flat_tables(bprm, bprm->p);
905 #else 981 #else
906 /* Stash our initial stack pointer int 982 /* Stash our initial stack pointer into the mm structure */
907 current->mm->start_stack = 983 current->mm->start_stack =
908 ((current->mm->context.end_brk 984 ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4;
909 pr_debug("sp=%lx\n", current->mm->star 985 pr_debug("sp=%lx\n", current->mm->start_stack);
910 986
911 /* copy the arg pages onto the stack * 987 /* copy the arg pages onto the stack */
912 res = transfer_args_to_stack(bprm, &cu 988 res = transfer_args_to_stack(bprm, ¤t->mm->start_stack);
913 if (!res) 989 if (!res)
914 res = create_flat_tables(bprm, 990 res = create_flat_tables(bprm, current->mm->start_stack);
915 #endif 991 #endif
916 if (res) 992 if (res)
917 return res; 993 return res;
918 994
919 /* Fake some return addresses to ensur 995 /* Fake some return addresses to ensure the call chain will
920 * initialise library in order for us. 996 * initialise library in order for us. We are required to call
921 * lib 1 first, then 2, ... and finall 997 * lib 1 first, then 2, ... and finally the main program (id 0).
922 */ 998 */
923 start_addr = libinfo.lib_list[0].entry 999 start_addr = libinfo.lib_list[0].entry;
>> 1000
>> 1001 #ifdef CONFIG_BINFMT_SHARED_FLAT
>> 1002 for (i = MAX_SHARED_LIBS-1; i > 0; i--) {
>> 1003 if (libinfo.lib_list[i].loaded) {
>> 1004 /* Push previos first to call address */
>> 1005 unsigned long __user *sp;
>> 1006 current->mm->start_stack -= sizeof(unsigned long);
>> 1007 sp = (unsigned long __user *)current->mm->start_stack;
>> 1008 if (put_user(start_addr, sp))
>> 1009 return -EFAULT;
>> 1010 start_addr = libinfo.lib_list[i].entry;
>> 1011 }
>> 1012 }
>> 1013 #endif
924 1014
925 #ifdef FLAT_PLAT_INIT 1015 #ifdef FLAT_PLAT_INIT
926 FLAT_PLAT_INIT(regs); 1016 FLAT_PLAT_INIT(regs);
927 #endif 1017 #endif
928 1018
929 finalize_exec(bprm); 1019 finalize_exec(bprm);
930 pr_debug("start_thread(regs=0x%p, entr 1020 pr_debug("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n",
931 regs, start_addr, current->mm 1021 regs, start_addr, current->mm->start_stack);
932 start_thread(regs, start_addr, current 1022 start_thread(regs, start_addr, current->mm->start_stack);
933 1023
934 return 0; 1024 return 0;
935 } 1025 }
936 1026
937 /********************************************* 1027 /****************************************************************************/
938 1028
939 static int __init init_flat_binfmt(void) 1029 static int __init init_flat_binfmt(void)
940 { 1030 {
941 register_binfmt(&flat_format); 1031 register_binfmt(&flat_format);
942 return 0; 1032 return 0;
943 } 1033 }
944 core_initcall(init_flat_binfmt); 1034 core_initcall(init_flat_binfmt);
945 1035
946 /********************************************* 1036 /****************************************************************************/
947 1037
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