Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /****************************************************************************/ |
3 | /* | |
4 | * linux/fs/binfmt_flat.c | |
5 | * | |
6 | * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com> | |
7 | * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> | |
8 | * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com> | |
9 | * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com> | |
10 | * based heavily on: | |
11 | * | |
12 | * linux/fs/binfmt_aout.c: | |
13 | * Copyright (C) 1991, 1992, 1996 Linus Torvalds | |
14 | * linux/fs/binfmt_flat.c for 2.0 kernel | |
15 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> | |
16 | * JAN/99 -- coded full program relocation (gerg@snapgear.com) | |
17 | */ | |
18 | ||
4adbb6ac NP |
19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
20 | ||
1da177e4 LT |
21 | #include <linux/kernel.h> |
22 | #include <linux/sched.h> | |
68db0cf1 | 23 | #include <linux/sched/task_stack.h> |
1da177e4 LT |
24 | #include <linux/mm.h> |
25 | #include <linux/mman.h> | |
1da177e4 LT |
26 | #include <linux/errno.h> |
27 | #include <linux/signal.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/fs.h> | |
30 | #include <linux/file.h> | |
1da177e4 LT |
31 | #include <linux/ptrace.h> |
32 | #include <linux/user.h> | |
33 | #include <linux/slab.h> | |
34 | #include <linux/binfmts.h> | |
35 | #include <linux/personality.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/flat.h> | |
13c3f50c | 38 | #include <linux/uaccess.h> |
472f95f3 | 39 | #include <linux/vmalloc.h> |
a99a3e2e | 40 | #include <linux/coredump.h> |
1da177e4 LT |
41 | |
42 | #include <asm/byteorder.h> | |
1da177e4 LT |
43 | #include <asm/unaligned.h> |
44 | #include <asm/cacheflush.h> | |
c3dc5bec | 45 | #include <asm/page.h> |
06d2bfed | 46 | #include <asm/flat.h> |
1da177e4 | 47 | |
02da2833 CH |
48 | #ifndef flat_get_relocate_addr |
49 | #define flat_get_relocate_addr(rel) (rel) | |
50 | #endif | |
1da177e4 LT |
51 | |
52 | /****************************************************************************/ | |
53 | ||
c3dc5bec | 54 | /* |
2e94de8a MF |
55 | * User data (data section and bss) needs to be aligned. |
56 | * We pick 0x20 here because it is the max value elf2flt has always | |
57 | * used in producing FLAT files, and because it seems to be large | |
58 | * enough to make all the gcc alignment related tests happy. | |
59 | */ | |
60 | #define FLAT_DATA_ALIGN (0x20) | |
61 | ||
62 | /* | |
63 | * User data (stack) also needs to be aligned. | |
64 | * Here we can be a bit looser than the data sections since this | |
65 | * needs to only meet arch ABI requirements. | |
c3dc5bec | 66 | */ |
2952095c | 67 | #define FLAT_STACK_ALIGN max_t(unsigned long, sizeof(void *), ARCH_SLAB_MINALIGN) |
c3dc5bec | 68 | |
1da177e4 LT |
69 | #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ |
70 | #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ | |
71 | ||
a445d988 CH |
72 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
73 | #define MAX_SHARED_LIBS (4) | |
74 | #else | |
75 | #define MAX_SHARED_LIBS (1) | |
76 | #endif | |
77 | ||
04d82a6d DLM |
78 | #ifdef CONFIG_BINFMT_FLAT_NO_DATA_START_OFFSET |
79 | #define DATA_START_OFFSET_WORDS (0) | |
80 | #else | |
81 | #define DATA_START_OFFSET_WORDS (MAX_SHARED_LIBS) | |
82 | #endif | |
83 | ||
1da177e4 LT |
84 | struct lib_info { |
85 | struct { | |
86 | unsigned long start_code; /* Start of text segment */ | |
87 | unsigned long start_data; /* Start of data segment */ | |
88 | unsigned long start_brk; /* End of data segment */ | |
89 | unsigned long text_len; /* Length of text segment */ | |
90 | unsigned long entry; /* Start address for this module */ | |
91 | unsigned long build_date; /* When this one was compiled */ | |
13c3f50c | 92 | bool loaded; /* Has this library been loaded? */ |
1da177e4 LT |
93 | } lib_list[MAX_SHARED_LIBS]; |
94 | }; | |
95 | ||
96 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
97 | static int load_flat_shared_library(int id, struct lib_info *p); | |
98 | #endif | |
99 | ||
71613c3b | 100 | static int load_flat_binary(struct linux_binprm *); |
f6151dfe | 101 | static int flat_core_dump(struct coredump_params *cprm); |
1da177e4 | 102 | |
1da177e4 LT |
103 | static struct linux_binfmt flat_format = { |
104 | .module = THIS_MODULE, | |
105 | .load_binary = load_flat_binary, | |
d65bc29b | 106 | #ifdef CONFIG_COREDUMP |
1da177e4 LT |
107 | .core_dump = flat_core_dump, |
108 | .min_coredump = PAGE_SIZE | |
d65bc29b | 109 | #endif |
1da177e4 LT |
110 | }; |
111 | ||
112 | /****************************************************************************/ | |
113 | /* | |
114 | * Routine writes a core dump image in the current directory. | |
115 | * Currently only a stub-function. | |
116 | */ | |
117 | ||
f6151dfe | 118 | static int flat_core_dump(struct coredump_params *cprm) |
1da177e4 | 119 | { |
4adbb6ac NP |
120 | pr_warn("Process %s:%d received signr %d and should have core dumped\n", |
121 | current->comm, current->pid, cprm->siginfo->si_signo); | |
13c3f50c | 122 | return 1; |
1da177e4 LT |
123 | } |
124 | ||
125 | /****************************************************************************/ | |
126 | /* | |
127 | * create_flat_tables() parses the env- and arg-strings in new user | |
128 | * memory and creates the pointer tables from them, and puts their | |
a97d157d | 129 | * addresses on the "stack", recording the new stack pointer value. |
1da177e4 LT |
130 | */ |
131 | ||
a97d157d | 132 | static int create_flat_tables(struct linux_binprm *bprm, unsigned long arg_start) |
1da177e4 | 133 | { |
a97d157d NP |
134 | char __user *p; |
135 | unsigned long __user *sp; | |
136 | long i, len; | |
1da177e4 | 137 | |
a97d157d NP |
138 | p = (char __user *)arg_start; |
139 | sp = (unsigned long __user *)current->mm->start_stack; | |
140 | ||
141 | sp -= bprm->envc + 1; | |
142 | sp -= bprm->argc + 1; | |
bdd15a28 CH |
143 | if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) |
144 | sp -= 2; /* argvp + envp */ | |
a97d157d NP |
145 | sp -= 1; /* &argc */ |
146 | ||
147 | current->mm->start_stack = (unsigned long)sp & -FLAT_STACK_ALIGN; | |
148 | sp = (unsigned long __user *)current->mm->start_stack; | |
149 | ||
8861fd57 AV |
150 | if (put_user(bprm->argc, sp++)) |
151 | return -EFAULT; | |
bdd15a28 | 152 | if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) { |
a97d157d NP |
153 | unsigned long argv, envp; |
154 | argv = (unsigned long)(sp + 2); | |
155 | envp = (unsigned long)(sp + 2 + bprm->argc + 1); | |
8861fd57 AV |
156 | if (put_user(argv, sp++) || put_user(envp, sp++)) |
157 | return -EFAULT; | |
a97d157d NP |
158 | } |
159 | ||
160 | current->mm->arg_start = (unsigned long)p; | |
161 | for (i = bprm->argc; i > 0; i--) { | |
8861fd57 AV |
162 | if (put_user((unsigned long)p, sp++)) |
163 | return -EFAULT; | |
a97d157d NP |
164 | len = strnlen_user(p, MAX_ARG_STRLEN); |
165 | if (!len || len > MAX_ARG_STRLEN) | |
166 | return -EINVAL; | |
167 | p += len; | |
168 | } | |
8861fd57 AV |
169 | if (put_user(0, sp++)) |
170 | return -EFAULT; | |
a97d157d NP |
171 | current->mm->arg_end = (unsigned long)p; |
172 | ||
173 | current->mm->env_start = (unsigned long) p; | |
174 | for (i = bprm->envc; i > 0; i--) { | |
8861fd57 AV |
175 | if (put_user((unsigned long)p, sp++)) |
176 | return -EFAULT; | |
a97d157d NP |
177 | len = strnlen_user(p, MAX_ARG_STRLEN); |
178 | if (!len || len > MAX_ARG_STRLEN) | |
179 | return -EINVAL; | |
180 | p += len; | |
181 | } | |
8861fd57 AV |
182 | if (put_user(0, sp++)) |
183 | return -EFAULT; | |
a97d157d NP |
184 | current->mm->env_end = (unsigned long)p; |
185 | ||
186 | return 0; | |
1da177e4 LT |
187 | } |
188 | ||
189 | /****************************************************************************/ | |
190 | ||
191 | #ifdef CONFIG_BINFMT_ZFLAT | |
192 | ||
193 | #include <linux/zlib.h> | |
194 | ||
195 | #define LBUFSIZE 4000 | |
196 | ||
197 | /* gzip flag byte */ | |
198 | #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ | |
199 | #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ | |
200 | #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ | |
201 | #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ | |
202 | #define COMMENT 0x10 /* bit 4 set: file comment present */ | |
203 | #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ | |
204 | #define RESERVED 0xC0 /* bit 6,7: reserved */ | |
205 | ||
bdd1d2d3 CH |
206 | static int decompress_exec(struct linux_binprm *bprm, loff_t fpos, char *dst, |
207 | long len, int fd) | |
1da177e4 LT |
208 | { |
209 | unsigned char *buf; | |
210 | z_stream strm; | |
1da177e4 LT |
211 | int ret, retval; |
212 | ||
bdd1d2d3 | 213 | pr_debug("decompress_exec(offset=%llx,buf=%p,len=%lx)\n", fpos, dst, len); |
1da177e4 LT |
214 | |
215 | memset(&strm, 0, sizeof(strm)); | |
216 | strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); | |
9367bb73 | 217 | if (!strm.workspace) |
1da177e4 | 218 | return -ENOMEM; |
9367bb73 | 219 | |
1da177e4 | 220 | buf = kmalloc(LBUFSIZE, GFP_KERNEL); |
9367bb73 | 221 | if (!buf) { |
1da177e4 LT |
222 | retval = -ENOMEM; |
223 | goto out_free; | |
224 | } | |
225 | ||
226 | /* Read in first chunk of data and parse gzip header. */ | |
bdd1d2d3 | 227 | ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos); |
1da177e4 LT |
228 | |
229 | strm.next_in = buf; | |
230 | strm.avail_in = ret; | |
231 | strm.total_in = 0; | |
232 | ||
233 | retval = -ENOEXEC; | |
234 | ||
235 | /* Check minimum size -- gzip header */ | |
236 | if (ret < 10) { | |
4adbb6ac | 237 | pr_debug("file too small?\n"); |
1da177e4 LT |
238 | goto out_free_buf; |
239 | } | |
240 | ||
241 | /* Check gzip magic number */ | |
242 | if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { | |
4adbb6ac | 243 | pr_debug("unknown compression magic?\n"); |
1da177e4 LT |
244 | goto out_free_buf; |
245 | } | |
246 | ||
247 | /* Check gzip method */ | |
248 | if (buf[2] != 8) { | |
4adbb6ac | 249 | pr_debug("unknown compression method?\n"); |
1da177e4 LT |
250 | goto out_free_buf; |
251 | } | |
252 | /* Check gzip flags */ | |
253 | if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || | |
254 | (buf[3] & RESERVED)) { | |
4adbb6ac | 255 | pr_debug("unknown flags?\n"); |
1da177e4 LT |
256 | goto out_free_buf; |
257 | } | |
258 | ||
259 | ret = 10; | |
260 | if (buf[3] & EXTRA_FIELD) { | |
261 | ret += 2 + buf[10] + (buf[11] << 8); | |
13c3f50c | 262 | if (unlikely(ret >= LBUFSIZE)) { |
4adbb6ac | 263 | pr_debug("buffer overflow (EXTRA)?\n"); |
1da177e4 LT |
264 | goto out_free_buf; |
265 | } | |
266 | } | |
267 | if (buf[3] & ORIG_NAME) { | |
f4cfb18d | 268 | while (ret < LBUFSIZE && buf[ret++] != 0) |
1da177e4 | 269 | ; |
13c3f50c | 270 | if (unlikely(ret == LBUFSIZE)) { |
4adbb6ac | 271 | pr_debug("buffer overflow (ORIG_NAME)?\n"); |
1da177e4 LT |
272 | goto out_free_buf; |
273 | } | |
274 | } | |
275 | if (buf[3] & COMMENT) { | |
f4cfb18d | 276 | while (ret < LBUFSIZE && buf[ret++] != 0) |
1da177e4 | 277 | ; |
13c3f50c | 278 | if (unlikely(ret == LBUFSIZE)) { |
4adbb6ac | 279 | pr_debug("buffer overflow (COMMENT)?\n"); |
1da177e4 LT |
280 | goto out_free_buf; |
281 | } | |
282 | } | |
283 | ||
284 | strm.next_in += ret; | |
285 | strm.avail_in -= ret; | |
286 | ||
287 | strm.next_out = dst; | |
288 | strm.avail_out = len; | |
289 | strm.total_out = 0; | |
290 | ||
291 | if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) { | |
4adbb6ac | 292 | pr_debug("zlib init failed?\n"); |
1da177e4 LT |
293 | goto out_free_buf; |
294 | } | |
295 | ||
296 | while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { | |
bdd1d2d3 | 297 | ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos); |
1da177e4 LT |
298 | if (ret <= 0) |
299 | break; | |
1da177e4 LT |
300 | len -= ret; |
301 | ||
302 | strm.next_in = buf; | |
303 | strm.avail_in = ret; | |
304 | strm.total_in = 0; | |
305 | } | |
306 | ||
307 | if (ret < 0) { | |
4adbb6ac | 308 | pr_debug("decompression failed (%d), %s\n", |
1da177e4 LT |
309 | ret, strm.msg); |
310 | goto out_zlib; | |
311 | } | |
312 | ||
313 | retval = 0; | |
314 | out_zlib: | |
315 | zlib_inflateEnd(&strm); | |
316 | out_free_buf: | |
317 | kfree(buf); | |
318 | out_free: | |
319 | kfree(strm.workspace); | |
1da177e4 LT |
320 | return retval; |
321 | } | |
322 | ||
323 | #endif /* CONFIG_BINFMT_ZFLAT */ | |
324 | ||
325 | /****************************************************************************/ | |
326 | ||
327 | static unsigned long | |
328 | calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp) | |
329 | { | |
330 | unsigned long addr; | |
331 | int id; | |
332 | unsigned long start_brk; | |
333 | unsigned long start_data; | |
334 | unsigned long text_len; | |
335 | unsigned long start_code; | |
336 | ||
337 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
338 | if (r == 0) | |
339 | id = curid; /* Relocs of 0 are always self referring */ | |
340 | else { | |
341 | id = (r >> 24) & 0xff; /* Find ID for this reloc */ | |
342 | r &= 0x00ffffff; /* Trim ID off here */ | |
343 | } | |
344 | if (id >= MAX_SHARED_LIBS) { | |
4adbb6ac | 345 | pr_err("reference 0x%lx to shared library %d", r, id); |
1da177e4 LT |
346 | goto failed; |
347 | } | |
348 | if (curid != id) { | |
349 | if (internalp) { | |
4adbb6ac NP |
350 | pr_err("reloc address 0x%lx not in same module " |
351 | "(%d != %d)", r, curid, id); | |
1da177e4 | 352 | goto failed; |
13c3f50c NP |
353 | } else if (!p->lib_list[id].loaded && |
354 | load_flat_shared_library(id, p) < 0) { | |
4adbb6ac | 355 | pr_err("failed to load library %d", id); |
1da177e4 LT |
356 | goto failed; |
357 | } | |
358 | /* Check versioning information (i.e. time stamps) */ | |
359 | if (p->lib_list[id].build_date && p->lib_list[curid].build_date && | |
360 | p->lib_list[curid].build_date < p->lib_list[id].build_date) { | |
4adbb6ac | 361 | pr_err("library %d is younger than %d", id, curid); |
1da177e4 LT |
362 | goto failed; |
363 | } | |
364 | } | |
365 | #else | |
366 | id = 0; | |
367 | #endif | |
368 | ||
369 | start_brk = p->lib_list[id].start_brk; | |
370 | start_data = p->lib_list[id].start_data; | |
371 | start_code = p->lib_list[id].start_code; | |
372 | text_len = p->lib_list[id].text_len; | |
373 | ||
9ee24b2a | 374 | if (r > start_brk - start_data + text_len) { |
4adbb6ac | 375 | pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)", |
13c3f50c | 376 | r, start_brk-start_data+text_len, text_len); |
1da177e4 LT |
377 | goto failed; |
378 | } | |
379 | ||
380 | if (r < text_len) /* In text segment */ | |
381 | addr = r + start_code; | |
382 | else /* In data segment */ | |
383 | addr = r - text_len + start_data; | |
384 | ||
385 | /* Range checked already above so doing the range tests is redundant...*/ | |
13c3f50c | 386 | return addr; |
1da177e4 LT |
387 | |
388 | failed: | |
4adbb6ac | 389 | pr_cont(", killing %s!\n", current->comm); |
1da177e4 LT |
390 | send_sig(SIGSEGV, current, 0); |
391 | ||
392 | return RELOC_FAILED; | |
393 | } | |
394 | ||
395 | /****************************************************************************/ | |
396 | ||
cf9a566c | 397 | #ifdef CONFIG_BINFMT_FLAT_OLD |
34303435 | 398 | static void old_reloc(unsigned long rl) |
1da177e4 | 399 | { |
13c3f50c | 400 | static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; |
1da177e4 | 401 | flat_v2_reloc_t r; |
1b2ce442 NP |
402 | unsigned long __user *ptr; |
403 | unsigned long val; | |
13c3f50c | 404 | |
1da177e4 LT |
405 | r.value = rl; |
406 | #if defined(CONFIG_COLDFIRE) | |
1b2ce442 | 407 | ptr = (unsigned long __user *)(current->mm->start_code + r.reloc.offset); |
1da177e4 | 408 | #else |
1b2ce442 | 409 | ptr = (unsigned long __user *)(current->mm->start_data + r.reloc.offset); |
1da177e4 | 410 | #endif |
1b2ce442 | 411 | get_user(val, ptr); |
1da177e4 | 412 | |
4adbb6ac NP |
413 | pr_debug("Relocation of variable at DATASEG+%x " |
414 | "(address %p, currently %lx) into segment %s\n", | |
1b2ce442 | 415 | r.reloc.offset, ptr, val, segment[r.reloc.type]); |
13c3f50c | 416 | |
1da177e4 LT |
417 | switch (r.reloc.type) { |
418 | case OLD_FLAT_RELOC_TYPE_TEXT: | |
1b2ce442 | 419 | val += current->mm->start_code; |
1da177e4 LT |
420 | break; |
421 | case OLD_FLAT_RELOC_TYPE_DATA: | |
1b2ce442 | 422 | val += current->mm->start_data; |
1da177e4 LT |
423 | break; |
424 | case OLD_FLAT_RELOC_TYPE_BSS: | |
1b2ce442 | 425 | val += current->mm->end_data; |
1da177e4 LT |
426 | break; |
427 | default: | |
4adbb6ac | 428 | pr_err("Unknown relocation type=%x\n", r.reloc.type); |
1da177e4 LT |
429 | break; |
430 | } | |
1b2ce442 | 431 | put_user(val, ptr); |
1da177e4 | 432 | |
1b2ce442 | 433 | pr_debug("Relocation became %lx\n", val); |
13c3f50c | 434 | } |
cf9a566c | 435 | #endif /* CONFIG_BINFMT_FLAT_OLD */ |
1da177e4 LT |
436 | |
437 | /****************************************************************************/ | |
438 | ||
13c3f50c | 439 | static int load_flat_file(struct linux_binprm *bprm, |
1da177e4 LT |
440 | struct lib_info *libinfo, int id, unsigned long *extra_stack) |
441 | { | |
13c3f50c NP |
442 | struct flat_hdr *hdr; |
443 | unsigned long textpos, datapos, realdatastart; | |
468138d7 | 444 | u32 text_len, data_len, bss_len, stack_len, full_data, flags; |
13c3f50c | 445 | unsigned long len, memp, memp_size, extra, rlim; |
3b977718 CH |
446 | __be32 __user *reloc; |
447 | u32 __user *rp; | |
13c3f50c | 448 | int i, rev, relocs; |
1da177e4 LT |
449 | loff_t fpos; |
450 | unsigned long start_code, end_code; | |
13c3f50c | 451 | ssize_t result; |
1ad3dcc0 | 452 | int ret; |
1da177e4 LT |
453 | |
454 | hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ | |
1da177e4 LT |
455 | |
456 | text_len = ntohl(hdr->data_start); | |
457 | data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); | |
458 | bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); | |
459 | stack_len = ntohl(hdr->stack_size); | |
460 | if (extra_stack) { | |
461 | stack_len += *extra_stack; | |
462 | *extra_stack = stack_len; | |
463 | } | |
464 | relocs = ntohl(hdr->reloc_count); | |
465 | flags = ntohl(hdr->flags); | |
466 | rev = ntohl(hdr->rev); | |
3dc20cb2 | 467 | full_data = data_len + relocs * sizeof(unsigned long); |
1da177e4 | 468 | |
845884d3 | 469 | if (strncmp(hdr->magic, "bFLT", 4)) { |
1da177e4 | 470 | /* |
e2a366dc MF |
471 | * Previously, here was a printk to tell people |
472 | * "BINFMT_FLAT: bad header magic". | |
473 | * But for the kernel which also use ELF FD-PIC format, this | |
474 | * error message is confusing. | |
1da177e4 | 475 | * because a lot of people do not manage to produce good |
1da177e4 | 476 | */ |
1ad3dcc0 LY |
477 | ret = -ENOEXEC; |
478 | goto err; | |
845884d3 GU |
479 | } |
480 | ||
481 | if (flags & FLAT_FLAG_KTRACE) | |
4adbb6ac | 482 | pr_info("Loading file: %s\n", bprm->filename); |
845884d3 | 483 | |
cf9a566c | 484 | #ifdef CONFIG_BINFMT_FLAT_OLD |
845884d3 | 485 | if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) { |
4adbb6ac NP |
486 | pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n", |
487 | rev, FLAT_VERSION, OLD_FLAT_VERSION); | |
1ad3dcc0 LY |
488 | ret = -ENOEXEC; |
489 | goto err; | |
1da177e4 | 490 | } |
13c3f50c | 491 | |
1da177e4 LT |
492 | /* Don't allow old format executables to use shared libraries */ |
493 | if (rev == OLD_FLAT_VERSION && id != 0) { | |
4adbb6ac NP |
494 | pr_err("shared libraries are not available before rev 0x%lx\n", |
495 | FLAT_VERSION); | |
1ad3dcc0 LY |
496 | ret = -ENOEXEC; |
497 | goto err; | |
1da177e4 LT |
498 | } |
499 | ||
cf9a566c CH |
500 | /* |
501 | * fix up the flags for the older format, there were all kinds | |
502 | * of endian hacks, this only works for the simple cases | |
503 | */ | |
504 | if (rev == OLD_FLAT_VERSION && | |
505 | (flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM))) | |
506 | flags = FLAT_FLAG_RAM; | |
507 | ||
508 | #else /* CONFIG_BINFMT_FLAT_OLD */ | |
509 | if (rev != FLAT_VERSION) { | |
510 | pr_err("bad flat file version 0x%x (supported 0x%lx)\n", | |
511 | rev, FLAT_VERSION); | |
512 | ret = -ENOEXEC; | |
513 | goto err; | |
514 | } | |
515 | #endif /* !CONFIG_BINFMT_FLAT_OLD */ | |
516 | ||
c995ee28 NP |
517 | /* |
518 | * Make sure the header params are sane. | |
519 | * 28 bits (256 MB) is way more than reasonable in this case. | |
520 | * If some top bits are set we have probable binary corruption. | |
521 | */ | |
522 | if ((text_len | data_len | bss_len | stack_len | full_data) >> 28) { | |
523 | pr_err("bad header\n"); | |
524 | ret = -ENOEXEC; | |
525 | goto err; | |
526 | } | |
527 | ||
1da177e4 LT |
528 | #ifndef CONFIG_BINFMT_ZFLAT |
529 | if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { | |
4adbb6ac | 530 | pr_err("Support for ZFLAT executables is not enabled.\n"); |
1ad3dcc0 LY |
531 | ret = -ENOEXEC; |
532 | goto err; | |
1da177e4 LT |
533 | } |
534 | #endif | |
535 | ||
536 | /* | |
537 | * Check initial limits. This avoids letting people circumvent | |
538 | * size limits imposed on them by creating programs with large | |
539 | * arrays in the data or bss. | |
540 | */ | |
d554ed89 | 541 | rlim = rlimit(RLIMIT_DATA); |
1da177e4 LT |
542 | if (rlim >= RLIM_INFINITY) |
543 | rlim = ~0; | |
1ad3dcc0 LY |
544 | if (data_len + bss_len > rlim) { |
545 | ret = -ENOMEM; | |
546 | goto err; | |
547 | } | |
548 | ||
1da177e4 LT |
549 | /* Flush all traces of the currently running executable */ |
550 | if (id == 0) { | |
2388777a | 551 | ret = begin_new_exec(bprm); |
13c3f50c | 552 | if (ret) |
df88912a | 553 | goto err; |
1da177e4 LT |
554 | |
555 | /* OK, This is the point of no return */ | |
fcc18e83 | 556 | set_personality(PER_LINUX_32BIT); |
221af7f8 | 557 | setup_new_exec(bprm); |
1da177e4 LT |
558 | } |
559 | ||
560 | /* | |
561 | * calculate the extra space we need to map in | |
562 | */ | |
0e647c04 AM |
563 | extra = max_t(unsigned long, bss_len + stack_len, |
564 | relocs * sizeof(unsigned long)); | |
1da177e4 LT |
565 | |
566 | /* | |
567 | * there are a couple of cases here, the separate code/data | |
568 | * case, and then the fully copied to RAM case which lumps | |
569 | * it all together. | |
570 | */ | |
015feacf | 571 | if (!IS_ENABLED(CONFIG_MMU) && !(flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP))) { |
1da177e4 LT |
572 | /* |
573 | * this should give us a ROM ptr, but if it doesn't we don't | |
574 | * really care | |
575 | */ | |
4adbb6ac | 576 | pr_debug("ROM mapping of file (we hope)\n"); |
1da177e4 | 577 | |
6be5ceb0 | 578 | textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, |
a4eec6a3 | 579 | MAP_PRIVATE, 0); |
0b8c78f2 | 580 | if (!textpos || IS_ERR_VALUE(textpos)) { |
1ad3dcc0 | 581 | ret = textpos; |
13c3f50c NP |
582 | if (!textpos) |
583 | ret = -ENOMEM; | |
4adbb6ac | 584 | pr_err("Unable to mmap process text, errno %d\n", ret); |
df88912a | 585 | goto err; |
1da177e4 LT |
586 | } |
587 | ||
04d82a6d DLM |
588 | len = data_len + extra + |
589 | DATA_START_OFFSET_WORDS * sizeof(unsigned long); | |
0f3e442a | 590 | len = PAGE_ALIGN(len); |
13c3f50c | 591 | realdatastart = vm_mmap(NULL, 0, len, |
72613e5f | 592 | PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); |
1da177e4 | 593 | |
0b8c78f2 | 594 | if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) { |
13c3f50c | 595 | ret = realdatastart; |
1da177e4 | 596 | if (!realdatastart) |
13c3f50c | 597 | ret = -ENOMEM; |
4adbb6ac | 598 | pr_err("Unable to allocate RAM for process data, " |
13c3f50c | 599 | "errno %d\n", ret); |
7696e0c3 | 600 | vm_munmap(textpos, text_len); |
df88912a | 601 | goto err; |
1da177e4 | 602 | } |
2217b982 | 603 | datapos = ALIGN(realdatastart + |
04d82a6d | 604 | DATA_START_OFFSET_WORDS * sizeof(unsigned long), |
2217b982 | 605 | FLAT_DATA_ALIGN); |
1da177e4 | 606 | |
a8605423 | 607 | pr_debug("Allocated data+bss+stack (%u bytes): %lx\n", |
4adbb6ac | 608 | data_len + bss_len + stack_len, datapos); |
1da177e4 LT |
609 | |
610 | fpos = ntohl(hdr->data_start); | |
611 | #ifdef CONFIG_BINFMT_ZFLAT | |
612 | if (flags & FLAT_FLAG_GZDATA) { | |
13c3f50c | 613 | result = decompress_exec(bprm, fpos, (char *)datapos, |
3dc20cb2 | 614 | full_data, 0); |
1da177e4 LT |
615 | } else |
616 | #endif | |
617 | { | |
3dc20cb2 AV |
618 | result = read_code(bprm->file, datapos, fpos, |
619 | full_data); | |
1da177e4 | 620 | } |
0b8c78f2 | 621 | if (IS_ERR_VALUE(result)) { |
13c3f50c | 622 | ret = result; |
4adbb6ac | 623 | pr_err("Unable to read data+bss, errno %d\n", ret); |
7696e0c3 AV |
624 | vm_munmap(textpos, text_len); |
625 | vm_munmap(realdatastart, len); | |
df88912a | 626 | goto err; |
1da177e4 LT |
627 | } |
628 | ||
3b977718 | 629 | reloc = (__be32 __user *) |
13c3f50c | 630 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
1da177e4 | 631 | memp = realdatastart; |
0f3e442a | 632 | memp_size = len; |
1da177e4 LT |
633 | } else { |
634 | ||
04d82a6d DLM |
635 | len = text_len + data_len + extra + |
636 | DATA_START_OFFSET_WORDS * sizeof(u32); | |
0f3e442a | 637 | len = PAGE_ALIGN(len); |
13c3f50c | 638 | textpos = vm_mmap(NULL, 0, len, |
72613e5f | 639 | PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); |
72613e5f | 640 | |
0b8c78f2 | 641 | if (!textpos || IS_ERR_VALUE(textpos)) { |
1ad3dcc0 | 642 | ret = textpos; |
13c3f50c NP |
643 | if (!textpos) |
644 | ret = -ENOMEM; | |
4adbb6ac | 645 | pr_err("Unable to allocate RAM for process text/data, " |
13c3f50c | 646 | "errno %d\n", ret); |
df88912a | 647 | goto err; |
1da177e4 LT |
648 | } |
649 | ||
650 | realdatastart = textpos + ntohl(hdr->data_start); | |
2217b982 | 651 | datapos = ALIGN(realdatastart + |
04d82a6d | 652 | DATA_START_OFFSET_WORDS * sizeof(u32), |
2217b982 | 653 | FLAT_DATA_ALIGN); |
c3dc5bec | 654 | |
3b977718 | 655 | reloc = (__be32 __user *) |
c3dc5bec | 656 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
1da177e4 | 657 | memp = textpos; |
0f3e442a | 658 | memp_size = len; |
1da177e4 LT |
659 | #ifdef CONFIG_BINFMT_ZFLAT |
660 | /* | |
661 | * load it all in and treat it like a RAM load from now on | |
662 | */ | |
663 | if (flags & FLAT_FLAG_GZIP) { | |
472f95f3 | 664 | #ifndef CONFIG_MMU |
13c3f50c NP |
665 | result = decompress_exec(bprm, sizeof(struct flat_hdr), |
666 | (((char *)textpos) + sizeof(struct flat_hdr)), | |
3dc20cb2 | 667 | (text_len + full_data |
13c3f50c | 668 | - sizeof(struct flat_hdr)), |
1da177e4 | 669 | 0); |
2217b982 MF |
670 | memmove((void *) datapos, (void *) realdatastart, |
671 | full_data); | |
472f95f3 NP |
672 | #else |
673 | /* | |
674 | * This is used on MMU systems mainly for testing. | |
675 | * Let's use a kernel buffer to simplify things. | |
676 | */ | |
677 | long unz_text_len = text_len - sizeof(struct flat_hdr); | |
678 | long unz_len = unz_text_len + full_data; | |
679 | char *unz_data = vmalloc(unz_len); | |
680 | if (!unz_data) { | |
681 | result = -ENOMEM; | |
682 | } else { | |
683 | result = decompress_exec(bprm, sizeof(struct flat_hdr), | |
684 | unz_data, unz_len, 0); | |
685 | if (result == 0 && | |
686 | (copy_to_user((void __user *)textpos + sizeof(struct flat_hdr), | |
687 | unz_data, unz_text_len) || | |
688 | copy_to_user((void __user *)datapos, | |
689 | unz_data + unz_text_len, full_data))) | |
690 | result = -EFAULT; | |
691 | vfree(unz_data); | |
692 | } | |
693 | #endif | |
1da177e4 | 694 | } else if (flags & FLAT_FLAG_GZDATA) { |
3dc20cb2 | 695 | result = read_code(bprm->file, textpos, 0, text_len); |
472f95f3 NP |
696 | if (!IS_ERR_VALUE(result)) { |
697 | #ifndef CONFIG_MMU | |
1da177e4 | 698 | result = decompress_exec(bprm, text_len, (char *) datapos, |
3dc20cb2 | 699 | full_data, 0); |
472f95f3 NP |
700 | #else |
701 | char *unz_data = vmalloc(full_data); | |
702 | if (!unz_data) { | |
703 | result = -ENOMEM; | |
704 | } else { | |
705 | result = decompress_exec(bprm, text_len, | |
706 | unz_data, full_data, 0); | |
707 | if (result == 0 && | |
708 | copy_to_user((void __user *)datapos, | |
709 | unz_data, full_data)) | |
710 | result = -EFAULT; | |
711 | vfree(unz_data); | |
712 | } | |
1da177e4 | 713 | #endif |
472f95f3 NP |
714 | } |
715 | } else | |
716 | #endif /* CONFIG_BINFMT_ZFLAT */ | |
1da177e4 | 717 | { |
3dc20cb2 AV |
718 | result = read_code(bprm->file, textpos, 0, text_len); |
719 | if (!IS_ERR_VALUE(result)) | |
720 | result = read_code(bprm->file, datapos, | |
721 | ntohl(hdr->data_start), | |
722 | full_data); | |
1da177e4 | 723 | } |
0b8c78f2 | 724 | if (IS_ERR_VALUE(result)) { |
13c3f50c | 725 | ret = result; |
4adbb6ac | 726 | pr_err("Unable to read code+data+bss, errno %d\n", ret); |
2217b982 | 727 | vm_munmap(textpos, text_len + data_len + extra + |
04d82a6d | 728 | DATA_START_OFFSET_WORDS * sizeof(u32)); |
df88912a | 729 | goto err; |
1da177e4 LT |
730 | } |
731 | } | |
732 | ||
13c3f50c NP |
733 | start_code = textpos + sizeof(struct flat_hdr); |
734 | end_code = textpos + text_len; | |
735 | text_len -= sizeof(struct flat_hdr); /* the real code len */ | |
1da177e4 LT |
736 | |
737 | /* The main program needs a little extra setup in the task structure */ | |
1da177e4 LT |
738 | if (id == 0) { |
739 | current->mm->start_code = start_code; | |
740 | current->mm->end_code = end_code; | |
741 | current->mm->start_data = datapos; | |
742 | current->mm->end_data = datapos + data_len; | |
743 | /* | |
744 | * set up the brk stuff, uses any slack left in data/bss/stack | |
745 | * allocation. We put the brk after the bss (between the bss | |
746 | * and stack) like other platforms. | |
0f3e442a DH |
747 | * Userspace code relies on the stack pointer starting out at |
748 | * an address right at the end of a page. | |
1da177e4 LT |
749 | */ |
750 | current->mm->start_brk = datapos + data_len + bss_len; | |
751 | current->mm->brk = (current->mm->start_brk + 3) & ~3; | |
015feacf | 752 | #ifndef CONFIG_MMU |
0f3e442a | 753 | current->mm->context.end_brk = memp + memp_size - stack_len; |
015feacf | 754 | #endif |
1da177e4 LT |
755 | } |
756 | ||
13c3f50c | 757 | if (flags & FLAT_FLAG_KTRACE) { |
4adbb6ac NP |
758 | pr_info("Mapping is %lx, Entry point is %x, data_start is %x\n", |
759 | textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); | |
760 | pr_info("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n", | |
761 | id ? "Lib" : "Load", bprm->filename, | |
762 | start_code, end_code, datapos, datapos + data_len, | |
763 | datapos + data_len, (datapos + data_len + bss_len + 3) & ~3); | |
13c3f50c | 764 | } |
1da177e4 LT |
765 | |
766 | /* Store the current module values into the global library structure */ | |
767 | libinfo->lib_list[id].start_code = start_code; | |
768 | libinfo->lib_list[id].start_data = datapos; | |
769 | libinfo->lib_list[id].start_brk = datapos + data_len + bss_len; | |
770 | libinfo->lib_list[id].text_len = text_len; | |
771 | libinfo->lib_list[id].loaded = 1; | |
772 | libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; | |
773 | libinfo->lib_list[id].build_date = ntohl(hdr->build_date); | |
13c3f50c | 774 | |
1da177e4 LT |
775 | /* |
776 | * We just load the allocations into some temporary memory to | |
777 | * help simplify all this mumbo jumbo | |
778 | * | |
779 | * We've got two different sections of relocation entries. | |
25985edc | 780 | * The first is the GOT which resides at the beginning of the data segment |
1da177e4 LT |
781 | * and is terminated with a -1. This one can be relocated in place. |
782 | * The second is the extra relocation entries tacked after the image's | |
783 | * data segment. These require a little more processing as the entry is | |
784 | * really an offset into the image which contains an offset into the | |
785 | * image. | |
786 | */ | |
787 | if (flags & FLAT_FLAG_GOTPIC) { | |
468138d7 AV |
788 | for (rp = (u32 __user *)datapos; ; rp++) { |
789 | u32 addr, rp_val; | |
6e572ffe NP |
790 | if (get_user(rp_val, rp)) |
791 | return -EFAULT; | |
792 | if (rp_val == 0xffffffff) | |
793 | break; | |
794 | if (rp_val) { | |
795 | addr = calc_reloc(rp_val, libinfo, id, 0); | |
1ad3dcc0 LY |
796 | if (addr == RELOC_FAILED) { |
797 | ret = -ENOEXEC; | |
df88912a | 798 | goto err; |
1ad3dcc0 | 799 | } |
6e572ffe NP |
800 | if (put_user(addr, rp)) |
801 | return -EFAULT; | |
1da177e4 LT |
802 | } |
803 | } | |
804 | } | |
805 | ||
806 | /* | |
807 | * Now run through the relocation entries. | |
808 | * We've got to be careful here as C++ produces relocatable zero | |
809 | * entries in the constructor and destructor tables which are then | |
810 | * tested for being not zero (which will always occur unless we're | |
811 | * based from address zero). This causes an endless loop as __start | |
812 | * is at zero. The solution used is to not relocate zero addresses. | |
813 | * This has the negative side effect of not allowing a global data | |
814 | * reference to be statically initialised to _stext (I've moved | |
815 | * __start to address 4 so that is okay). | |
816 | */ | |
817 | if (rev > OLD_FLAT_VERSION) { | |
13c3f50c | 818 | for (i = 0; i < relocs; i++) { |
468138d7 | 819 | u32 addr, relval; |
3b977718 | 820 | __be32 tmp; |
1da177e4 | 821 | |
13c3f50c NP |
822 | /* |
823 | * Get the address of the pointer to be | |
824 | * relocated (of course, the address has to be | |
825 | * relocated first). | |
826 | */ | |
3b977718 | 827 | if (get_user(tmp, reloc + i)) |
6e572ffe | 828 | return -EFAULT; |
3b977718 | 829 | relval = ntohl(tmp); |
1da177e4 | 830 | addr = flat_get_relocate_addr(relval); |
468138d7 AV |
831 | rp = (u32 __user *)calc_reloc(addr, libinfo, id, 1); |
832 | if (rp == (u32 __user *)RELOC_FAILED) { | |
1ad3dcc0 | 833 | ret = -ENOEXEC; |
df88912a | 834 | goto err; |
1ad3dcc0 | 835 | } |
1da177e4 LT |
836 | |
837 | /* Get the pointer's value. */ | |
6843d8aa | 838 | ret = flat_get_addr_from_rp(rp, relval, flags, &addr); |
468138d7 AV |
839 | if (unlikely(ret)) |
840 | goto err; | |
841 | ||
1da177e4 LT |
842 | if (addr != 0) { |
843 | /* | |
844 | * Do the relocation. PIC relocs in the data section are | |
845 | * already in target order | |
846 | */ | |
3b977718 CH |
847 | if ((flags & FLAT_FLAG_GOTPIC) == 0) { |
848 | /* | |
849 | * Meh, the same value can have a different | |
850 | * byte order based on a flag.. | |
851 | */ | |
852 | addr = ntohl((__force __be32)addr); | |
853 | } | |
1da177e4 | 854 | addr = calc_reloc(addr, libinfo, id, 0); |
1ad3dcc0 LY |
855 | if (addr == RELOC_FAILED) { |
856 | ret = -ENOEXEC; | |
df88912a | 857 | goto err; |
1ad3dcc0 | 858 | } |
1da177e4 LT |
859 | |
860 | /* Write back the relocated pointer. */ | |
468138d7 AV |
861 | ret = flat_put_addr_at_rp(rp, addr, relval); |
862 | if (unlikely(ret)) | |
863 | goto err; | |
1da177e4 LT |
864 | } |
865 | } | |
cf9a566c | 866 | #ifdef CONFIG_BINFMT_FLAT_OLD |
1da177e4 | 867 | } else { |
1b2ce442 | 868 | for (i = 0; i < relocs; i++) { |
3b977718 | 869 | __be32 relval; |
1b2ce442 NP |
870 | if (get_user(relval, reloc + i)) |
871 | return -EFAULT; | |
3b977718 | 872 | old_reloc(ntohl(relval)); |
1b2ce442 | 873 | } |
cf9a566c | 874 | #endif /* CONFIG_BINFMT_FLAT_OLD */ |
1da177e4 | 875 | } |
13c3f50c | 876 | |
79ef1e1f | 877 | flush_icache_user_range(start_code, end_code); |
1da177e4 LT |
878 | |
879 | /* zero the BSS, BRK and stack areas */ | |
467aa146 NP |
880 | if (clear_user((void __user *)(datapos + data_len), bss_len + |
881 | (memp + memp_size - stack_len - /* end brk */ | |
882 | libinfo->lib_list[id].start_brk) + /* start brk */ | |
883 | stack_len)) | |
884 | return -EFAULT; | |
1da177e4 LT |
885 | |
886 | return 0; | |
1ad3dcc0 LY |
887 | err: |
888 | return ret; | |
1da177e4 LT |
889 | } |
890 | ||
891 | ||
892 | /****************************************************************************/ | |
893 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
894 | ||
895 | /* | |
896 | * Load a shared library into memory. The library gets its own data | |
897 | * segment (including bss) but not argv/argc/environ. | |
898 | */ | |
899 | ||
900 | static int load_flat_shared_library(int id, struct lib_info *libs) | |
901 | { | |
867bfa4a JH |
902 | /* |
903 | * This is a fake bprm struct; only the members "buf", "file" and | |
904 | * "filename" are actually used. | |
905 | */ | |
1da177e4 LT |
906 | struct linux_binprm bprm; |
907 | int res; | |
908 | char buf[16]; | |
867bfa4a | 909 | loff_t pos = 0; |
1da177e4 | 910 | |
3a852d3b DH |
911 | memset(&bprm, 0, sizeof(bprm)); |
912 | ||
1da177e4 LT |
913 | /* Create the file name */ |
914 | sprintf(buf, "/lib/lib%d.so", id); | |
915 | ||
916 | /* Open the file up */ | |
917 | bprm.filename = buf; | |
918 | bprm.file = open_exec(bprm.filename); | |
919 | res = PTR_ERR(bprm.file); | |
920 | if (IS_ERR(bprm.file)) | |
921 | return res; | |
922 | ||
867bfa4a | 923 | res = kernel_read(bprm.file, bprm.buf, BINPRM_BUF_SIZE, &pos); |
1da177e4 | 924 | |
867bfa4a | 925 | if (res >= 0) |
1da177e4 | 926 | res = load_flat_file(&bprm, libs, id, NULL); |
3440625d | 927 | |
3440625d LT |
928 | allow_write_access(bprm.file); |
929 | fput(bprm.file); | |
930 | ||
13c3f50c | 931 | return res; |
1da177e4 LT |
932 | } |
933 | ||
934 | #endif /* CONFIG_BINFMT_SHARED_FLAT */ | |
935 | /****************************************************************************/ | |
936 | ||
937 | /* | |
938 | * These are the functions used to load flat style executables and shared | |
939 | * libraries. There is no binary dependent code anywhere else. | |
940 | */ | |
941 | ||
13c3f50c | 942 | static int load_flat_binary(struct linux_binprm *bprm) |
1da177e4 LT |
943 | { |
944 | struct lib_info libinfo; | |
71613c3b | 945 | struct pt_regs *regs = current_pt_regs(); |
015feacf | 946 | unsigned long stack_len = 0; |
1da177e4 | 947 | unsigned long start_addr; |
1da177e4 LT |
948 | int res; |
949 | int i, j; | |
950 | ||
951 | memset(&libinfo, 0, sizeof(libinfo)); | |
13c3f50c | 952 | |
1da177e4 LT |
953 | /* |
954 | * We have to add the size of our arguments to our stack size | |
955 | * otherwise it's too easy for users to create stack overflows | |
956 | * by passing in a huge argument list. And yes, we have to be | |
957 | * pedantic and include space for the argv/envp array as it may have | |
958 | * a lot of entries. | |
959 | */ | |
015feacf NP |
960 | #ifndef CONFIG_MMU |
961 | stack_len += PAGE_SIZE * MAX_ARG_PAGES - bprm->p; /* the strings */ | |
962 | #endif | |
a97d157d NP |
963 | stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */ |
964 | stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */ | |
965 | stack_len = ALIGN(stack_len, FLAT_STACK_ALIGN); | |
13c3f50c | 966 | |
1da177e4 | 967 | res = load_flat_file(bprm, &libinfo, 0, &stack_len); |
287980e4 | 968 | if (res < 0) |
1da177e4 | 969 | return res; |
13c3f50c | 970 | |
1da177e4 | 971 | /* Update data segment pointers for all libraries */ |
af521f92 NP |
972 | for (i = 0; i < MAX_SHARED_LIBS; i++) { |
973 | if (!libinfo.lib_list[i].loaded) | |
974 | continue; | |
975 | for (j = 0; j < MAX_SHARED_LIBS; j++) { | |
976 | unsigned long val = libinfo.lib_list[j].loaded ? | |
977 | libinfo.lib_list[j].start_data : UNLOADED_LIB; | |
978 | unsigned long __user *p = (unsigned long __user *) | |
979 | libinfo.lib_list[i].start_data; | |
980 | p -= j + 1; | |
981 | if (put_user(val, p)) | |
982 | return -EFAULT; | |
983 | } | |
984 | } | |
1da177e4 | 985 | |
1da177e4 LT |
986 | set_binfmt(&flat_format); |
987 | ||
015feacf NP |
988 | #ifdef CONFIG_MMU |
989 | res = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT); | |
990 | if (!res) | |
991 | res = create_flat_tables(bprm, bprm->p); | |
992 | #else | |
a97d157d NP |
993 | /* Stash our initial stack pointer into the mm structure */ |
994 | current->mm->start_stack = | |
995 | ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; | |
996 | pr_debug("sp=%lx\n", current->mm->start_stack); | |
1da177e4 | 997 | |
687fd773 | 998 | /* copy the arg pages onto the stack */ |
a97d157d NP |
999 | res = transfer_args_to_stack(bprm, ¤t->mm->start_stack); |
1000 | if (!res) | |
1001 | res = create_flat_tables(bprm, current->mm->start_stack); | |
015feacf | 1002 | #endif |
687fd773 NP |
1003 | if (res) |
1004 | return res; | |
1da177e4 | 1005 | |
1da177e4 LT |
1006 | /* Fake some return addresses to ensure the call chain will |
1007 | * initialise library in order for us. We are required to call | |
1008 | * lib 1 first, then 2, ... and finally the main program (id 0). | |
1009 | */ | |
1010 | start_addr = libinfo.lib_list[0].entry; | |
1011 | ||
1012 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
13c3f50c | 1013 | for (i = MAX_SHARED_LIBS-1; i > 0; i--) { |
1da177e4 LT |
1014 | if (libinfo.lib_list[i].loaded) { |
1015 | /* Push previos first to call address */ | |
a97d157d NP |
1016 | unsigned long __user *sp; |
1017 | current->mm->start_stack -= sizeof(unsigned long); | |
1018 | sp = (unsigned long __user *)current->mm->start_stack; | |
8861fd57 AV |
1019 | if (put_user(start_addr, sp)) |
1020 | return -EFAULT; | |
1da177e4 LT |
1021 | start_addr = libinfo.lib_list[i].entry; |
1022 | } | |
1023 | } | |
1024 | #endif | |
13c3f50c | 1025 | |
74c27c43 TY |
1026 | #ifdef FLAT_PLAT_INIT |
1027 | FLAT_PLAT_INIT(regs); | |
1028 | #endif | |
13c3f50c | 1029 | |
b8383831 | 1030 | finalize_exec(bprm); |
4adbb6ac NP |
1031 | pr_debug("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n", |
1032 | regs, start_addr, current->mm->start_stack); | |
1da177e4 LT |
1033 | start_thread(regs, start_addr, current->mm->start_stack); |
1034 | ||
1da177e4 LT |
1035 | return 0; |
1036 | } | |
1037 | ||
1038 | /****************************************************************************/ | |
1039 | ||
1040 | static int __init init_flat_binfmt(void) | |
1041 | { | |
8fc3dc5a AV |
1042 | register_binfmt(&flat_format); |
1043 | return 0; | |
1da177e4 | 1044 | } |
1da177e4 | 1045 | core_initcall(init_flat_binfmt); |
1da177e4 LT |
1046 | |
1047 | /****************************************************************************/ |