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> |
1da177e4 LT |
40 | |
41 | #include <asm/byteorder.h> | |
1da177e4 LT |
42 | #include <asm/unaligned.h> |
43 | #include <asm/cacheflush.h> | |
c3dc5bec | 44 | #include <asm/page.h> |
1da177e4 | 45 | |
02da2833 CH |
46 | #ifndef flat_get_relocate_addr |
47 | #define flat_get_relocate_addr(rel) (rel) | |
48 | #endif | |
49 | ||
1da177e4 LT |
50 | /****************************************************************************/ |
51 | ||
c3dc5bec | 52 | /* |
2e94de8a MF |
53 | * User data (data section and bss) needs to be aligned. |
54 | * We pick 0x20 here because it is the max value elf2flt has always | |
55 | * used in producing FLAT files, and because it seems to be large | |
56 | * enough to make all the gcc alignment related tests happy. | |
57 | */ | |
58 | #define FLAT_DATA_ALIGN (0x20) | |
59 | ||
60 | /* | |
61 | * User data (stack) also needs to be aligned. | |
62 | * Here we can be a bit looser than the data sections since this | |
63 | * needs to only meet arch ABI requirements. | |
c3dc5bec | 64 | */ |
2952095c | 65 | #define FLAT_STACK_ALIGN max_t(unsigned long, sizeof(void *), ARCH_SLAB_MINALIGN) |
c3dc5bec | 66 | |
1da177e4 LT |
67 | #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ |
68 | #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ | |
69 | ||
70 | struct lib_info { | |
71 | struct { | |
72 | unsigned long start_code; /* Start of text segment */ | |
73 | unsigned long start_data; /* Start of data segment */ | |
74 | unsigned long start_brk; /* End of data segment */ | |
75 | unsigned long text_len; /* Length of text segment */ | |
76 | unsigned long entry; /* Start address for this module */ | |
77 | unsigned long build_date; /* When this one was compiled */ | |
13c3f50c | 78 | bool loaded; /* Has this library been loaded? */ |
1da177e4 LT |
79 | } lib_list[MAX_SHARED_LIBS]; |
80 | }; | |
81 | ||
82 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
83 | static int load_flat_shared_library(int id, struct lib_info *p); | |
84 | #endif | |
85 | ||
71613c3b | 86 | static int load_flat_binary(struct linux_binprm *); |
f6151dfe | 87 | static int flat_core_dump(struct coredump_params *cprm); |
1da177e4 | 88 | |
1da177e4 LT |
89 | static struct linux_binfmt flat_format = { |
90 | .module = THIS_MODULE, | |
91 | .load_binary = load_flat_binary, | |
92 | .core_dump = flat_core_dump, | |
93 | .min_coredump = PAGE_SIZE | |
94 | }; | |
95 | ||
96 | /****************************************************************************/ | |
97 | /* | |
98 | * Routine writes a core dump image in the current directory. | |
99 | * Currently only a stub-function. | |
100 | */ | |
101 | ||
f6151dfe | 102 | static int flat_core_dump(struct coredump_params *cprm) |
1da177e4 | 103 | { |
4adbb6ac NP |
104 | pr_warn("Process %s:%d received signr %d and should have core dumped\n", |
105 | current->comm, current->pid, cprm->siginfo->si_signo); | |
13c3f50c | 106 | return 1; |
1da177e4 LT |
107 | } |
108 | ||
109 | /****************************************************************************/ | |
110 | /* | |
111 | * create_flat_tables() parses the env- and arg-strings in new user | |
112 | * memory and creates the pointer tables from them, and puts their | |
a97d157d | 113 | * addresses on the "stack", recording the new stack pointer value. |
1da177e4 LT |
114 | */ |
115 | ||
a97d157d | 116 | static int create_flat_tables(struct linux_binprm *bprm, unsigned long arg_start) |
1da177e4 | 117 | { |
a97d157d NP |
118 | char __user *p; |
119 | unsigned long __user *sp; | |
120 | long i, len; | |
1da177e4 | 121 | |
a97d157d NP |
122 | p = (char __user *)arg_start; |
123 | sp = (unsigned long __user *)current->mm->start_stack; | |
124 | ||
125 | sp -= bprm->envc + 1; | |
126 | sp -= bprm->argc + 1; | |
bdd15a28 CH |
127 | if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) |
128 | sp -= 2; /* argvp + envp */ | |
a97d157d NP |
129 | sp -= 1; /* &argc */ |
130 | ||
131 | current->mm->start_stack = (unsigned long)sp & -FLAT_STACK_ALIGN; | |
132 | sp = (unsigned long __user *)current->mm->start_stack; | |
133 | ||
134 | __put_user(bprm->argc, sp++); | |
bdd15a28 | 135 | if (IS_ENABLED(CONFIG_BINFMT_FLAT_ARGVP_ENVP_ON_STACK)) { |
a97d157d NP |
136 | unsigned long argv, envp; |
137 | argv = (unsigned long)(sp + 2); | |
138 | envp = (unsigned long)(sp + 2 + bprm->argc + 1); | |
139 | __put_user(argv, sp++); | |
140 | __put_user(envp, sp++); | |
141 | } | |
142 | ||
143 | current->mm->arg_start = (unsigned long)p; | |
144 | for (i = bprm->argc; i > 0; i--) { | |
145 | __put_user((unsigned long)p, sp++); | |
146 | len = strnlen_user(p, MAX_ARG_STRLEN); | |
147 | if (!len || len > MAX_ARG_STRLEN) | |
148 | return -EINVAL; | |
149 | p += len; | |
150 | } | |
151 | __put_user(0, sp++); | |
152 | current->mm->arg_end = (unsigned long)p; | |
153 | ||
154 | current->mm->env_start = (unsigned long) p; | |
155 | for (i = bprm->envc; i > 0; i--) { | |
156 | __put_user((unsigned long)p, sp++); | |
157 | len = strnlen_user(p, MAX_ARG_STRLEN); | |
158 | if (!len || len > MAX_ARG_STRLEN) | |
159 | return -EINVAL; | |
160 | p += len; | |
161 | } | |
162 | __put_user(0, sp++); | |
163 | current->mm->env_end = (unsigned long)p; | |
164 | ||
165 | return 0; | |
1da177e4 LT |
166 | } |
167 | ||
168 | /****************************************************************************/ | |
169 | ||
170 | #ifdef CONFIG_BINFMT_ZFLAT | |
171 | ||
172 | #include <linux/zlib.h> | |
173 | ||
174 | #define LBUFSIZE 4000 | |
175 | ||
176 | /* gzip flag byte */ | |
177 | #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ | |
178 | #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ | |
179 | #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ | |
180 | #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ | |
181 | #define COMMENT 0x10 /* bit 4 set: file comment present */ | |
182 | #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ | |
183 | #define RESERVED 0xC0 /* bit 6,7: reserved */ | |
184 | ||
bdd1d2d3 CH |
185 | static int decompress_exec(struct linux_binprm *bprm, loff_t fpos, char *dst, |
186 | long len, int fd) | |
1da177e4 LT |
187 | { |
188 | unsigned char *buf; | |
189 | z_stream strm; | |
1da177e4 LT |
190 | int ret, retval; |
191 | ||
bdd1d2d3 | 192 | pr_debug("decompress_exec(offset=%llx,buf=%p,len=%lx)\n", fpos, dst, len); |
1da177e4 LT |
193 | |
194 | memset(&strm, 0, sizeof(strm)); | |
195 | strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); | |
9367bb73 | 196 | if (!strm.workspace) |
1da177e4 | 197 | return -ENOMEM; |
9367bb73 | 198 | |
1da177e4 | 199 | buf = kmalloc(LBUFSIZE, GFP_KERNEL); |
9367bb73 | 200 | if (!buf) { |
1da177e4 LT |
201 | retval = -ENOMEM; |
202 | goto out_free; | |
203 | } | |
204 | ||
205 | /* Read in first chunk of data and parse gzip header. */ | |
bdd1d2d3 | 206 | ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos); |
1da177e4 LT |
207 | |
208 | strm.next_in = buf; | |
209 | strm.avail_in = ret; | |
210 | strm.total_in = 0; | |
211 | ||
212 | retval = -ENOEXEC; | |
213 | ||
214 | /* Check minimum size -- gzip header */ | |
215 | if (ret < 10) { | |
4adbb6ac | 216 | pr_debug("file too small?\n"); |
1da177e4 LT |
217 | goto out_free_buf; |
218 | } | |
219 | ||
220 | /* Check gzip magic number */ | |
221 | if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { | |
4adbb6ac | 222 | pr_debug("unknown compression magic?\n"); |
1da177e4 LT |
223 | goto out_free_buf; |
224 | } | |
225 | ||
226 | /* Check gzip method */ | |
227 | if (buf[2] != 8) { | |
4adbb6ac | 228 | pr_debug("unknown compression method?\n"); |
1da177e4 LT |
229 | goto out_free_buf; |
230 | } | |
231 | /* Check gzip flags */ | |
232 | if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || | |
233 | (buf[3] & RESERVED)) { | |
4adbb6ac | 234 | pr_debug("unknown flags?\n"); |
1da177e4 LT |
235 | goto out_free_buf; |
236 | } | |
237 | ||
238 | ret = 10; | |
239 | if (buf[3] & EXTRA_FIELD) { | |
240 | ret += 2 + buf[10] + (buf[11] << 8); | |
13c3f50c | 241 | if (unlikely(ret >= LBUFSIZE)) { |
4adbb6ac | 242 | pr_debug("buffer overflow (EXTRA)?\n"); |
1da177e4 LT |
243 | goto out_free_buf; |
244 | } | |
245 | } | |
246 | if (buf[3] & ORIG_NAME) { | |
f4cfb18d | 247 | while (ret < LBUFSIZE && buf[ret++] != 0) |
1da177e4 | 248 | ; |
13c3f50c | 249 | if (unlikely(ret == LBUFSIZE)) { |
4adbb6ac | 250 | pr_debug("buffer overflow (ORIG_NAME)?\n"); |
1da177e4 LT |
251 | goto out_free_buf; |
252 | } | |
253 | } | |
254 | if (buf[3] & COMMENT) { | |
f4cfb18d | 255 | while (ret < LBUFSIZE && buf[ret++] != 0) |
1da177e4 | 256 | ; |
13c3f50c | 257 | if (unlikely(ret == LBUFSIZE)) { |
4adbb6ac | 258 | pr_debug("buffer overflow (COMMENT)?\n"); |
1da177e4 LT |
259 | goto out_free_buf; |
260 | } | |
261 | } | |
262 | ||
263 | strm.next_in += ret; | |
264 | strm.avail_in -= ret; | |
265 | ||
266 | strm.next_out = dst; | |
267 | strm.avail_out = len; | |
268 | strm.total_out = 0; | |
269 | ||
270 | if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) { | |
4adbb6ac | 271 | pr_debug("zlib init failed?\n"); |
1da177e4 LT |
272 | goto out_free_buf; |
273 | } | |
274 | ||
275 | while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { | |
bdd1d2d3 | 276 | ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos); |
1da177e4 LT |
277 | if (ret <= 0) |
278 | break; | |
1da177e4 LT |
279 | len -= ret; |
280 | ||
281 | strm.next_in = buf; | |
282 | strm.avail_in = ret; | |
283 | strm.total_in = 0; | |
284 | } | |
285 | ||
286 | if (ret < 0) { | |
4adbb6ac | 287 | pr_debug("decompression failed (%d), %s\n", |
1da177e4 LT |
288 | ret, strm.msg); |
289 | goto out_zlib; | |
290 | } | |
291 | ||
292 | retval = 0; | |
293 | out_zlib: | |
294 | zlib_inflateEnd(&strm); | |
295 | out_free_buf: | |
296 | kfree(buf); | |
297 | out_free: | |
298 | kfree(strm.workspace); | |
1da177e4 LT |
299 | return retval; |
300 | } | |
301 | ||
302 | #endif /* CONFIG_BINFMT_ZFLAT */ | |
303 | ||
304 | /****************************************************************************/ | |
305 | ||
306 | static unsigned long | |
307 | calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp) | |
308 | { | |
309 | unsigned long addr; | |
310 | int id; | |
311 | unsigned long start_brk; | |
312 | unsigned long start_data; | |
313 | unsigned long text_len; | |
314 | unsigned long start_code; | |
315 | ||
316 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
317 | if (r == 0) | |
318 | id = curid; /* Relocs of 0 are always self referring */ | |
319 | else { | |
320 | id = (r >> 24) & 0xff; /* Find ID for this reloc */ | |
321 | r &= 0x00ffffff; /* Trim ID off here */ | |
322 | } | |
323 | if (id >= MAX_SHARED_LIBS) { | |
4adbb6ac | 324 | pr_err("reference 0x%lx to shared library %d", r, id); |
1da177e4 LT |
325 | goto failed; |
326 | } | |
327 | if (curid != id) { | |
328 | if (internalp) { | |
4adbb6ac NP |
329 | pr_err("reloc address 0x%lx not in same module " |
330 | "(%d != %d)", r, curid, id); | |
1da177e4 | 331 | goto failed; |
13c3f50c NP |
332 | } else if (!p->lib_list[id].loaded && |
333 | load_flat_shared_library(id, p) < 0) { | |
4adbb6ac | 334 | pr_err("failed to load library %d", id); |
1da177e4 LT |
335 | goto failed; |
336 | } | |
337 | /* Check versioning information (i.e. time stamps) */ | |
338 | if (p->lib_list[id].build_date && p->lib_list[curid].build_date && | |
339 | p->lib_list[curid].build_date < p->lib_list[id].build_date) { | |
4adbb6ac | 340 | pr_err("library %d is younger than %d", id, curid); |
1da177e4 LT |
341 | goto failed; |
342 | } | |
343 | } | |
344 | #else | |
345 | id = 0; | |
346 | #endif | |
347 | ||
348 | start_brk = p->lib_list[id].start_brk; | |
349 | start_data = p->lib_list[id].start_data; | |
350 | start_code = p->lib_list[id].start_code; | |
351 | text_len = p->lib_list[id].text_len; | |
352 | ||
9ee24b2a | 353 | if (r > start_brk - start_data + text_len) { |
4adbb6ac | 354 | pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)", |
13c3f50c | 355 | r, start_brk-start_data+text_len, text_len); |
1da177e4 LT |
356 | goto failed; |
357 | } | |
358 | ||
359 | if (r < text_len) /* In text segment */ | |
360 | addr = r + start_code; | |
361 | else /* In data segment */ | |
362 | addr = r - text_len + start_data; | |
363 | ||
364 | /* Range checked already above so doing the range tests is redundant...*/ | |
13c3f50c | 365 | return addr; |
1da177e4 LT |
366 | |
367 | failed: | |
4adbb6ac | 368 | pr_cont(", killing %s!\n", current->comm); |
1da177e4 LT |
369 | send_sig(SIGSEGV, current, 0); |
370 | ||
371 | return RELOC_FAILED; | |
372 | } | |
373 | ||
374 | /****************************************************************************/ | |
375 | ||
34303435 | 376 | static void old_reloc(unsigned long rl) |
1da177e4 | 377 | { |
13c3f50c | 378 | static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; |
1da177e4 | 379 | flat_v2_reloc_t r; |
1b2ce442 NP |
380 | unsigned long __user *ptr; |
381 | unsigned long val; | |
13c3f50c | 382 | |
1da177e4 LT |
383 | r.value = rl; |
384 | #if defined(CONFIG_COLDFIRE) | |
1b2ce442 | 385 | ptr = (unsigned long __user *)(current->mm->start_code + r.reloc.offset); |
1da177e4 | 386 | #else |
1b2ce442 | 387 | ptr = (unsigned long __user *)(current->mm->start_data + r.reloc.offset); |
1da177e4 | 388 | #endif |
1b2ce442 | 389 | get_user(val, ptr); |
1da177e4 | 390 | |
4adbb6ac NP |
391 | pr_debug("Relocation of variable at DATASEG+%x " |
392 | "(address %p, currently %lx) into segment %s\n", | |
1b2ce442 | 393 | r.reloc.offset, ptr, val, segment[r.reloc.type]); |
13c3f50c | 394 | |
1da177e4 LT |
395 | switch (r.reloc.type) { |
396 | case OLD_FLAT_RELOC_TYPE_TEXT: | |
1b2ce442 | 397 | val += current->mm->start_code; |
1da177e4 LT |
398 | break; |
399 | case OLD_FLAT_RELOC_TYPE_DATA: | |
1b2ce442 | 400 | val += current->mm->start_data; |
1da177e4 LT |
401 | break; |
402 | case OLD_FLAT_RELOC_TYPE_BSS: | |
1b2ce442 | 403 | val += current->mm->end_data; |
1da177e4 LT |
404 | break; |
405 | default: | |
4adbb6ac | 406 | pr_err("Unknown relocation type=%x\n", r.reloc.type); |
1da177e4 LT |
407 | break; |
408 | } | |
1b2ce442 | 409 | put_user(val, ptr); |
1da177e4 | 410 | |
1b2ce442 | 411 | pr_debug("Relocation became %lx\n", val); |
13c3f50c | 412 | } |
1da177e4 LT |
413 | |
414 | /****************************************************************************/ | |
415 | ||
13c3f50c | 416 | static int load_flat_file(struct linux_binprm *bprm, |
1da177e4 LT |
417 | struct lib_info *libinfo, int id, unsigned long *extra_stack) |
418 | { | |
13c3f50c NP |
419 | struct flat_hdr *hdr; |
420 | unsigned long textpos, datapos, realdatastart; | |
468138d7 | 421 | u32 text_len, data_len, bss_len, stack_len, full_data, flags; |
13c3f50c | 422 | unsigned long len, memp, memp_size, extra, rlim; |
468138d7 | 423 | u32 __user *reloc, *rp; |
1da177e4 | 424 | struct inode *inode; |
13c3f50c | 425 | int i, rev, relocs; |
1da177e4 LT |
426 | loff_t fpos; |
427 | unsigned long start_code, end_code; | |
13c3f50c | 428 | ssize_t result; |
1ad3dcc0 | 429 | int ret; |
1da177e4 LT |
430 | |
431 | hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ | |
496ad9aa | 432 | inode = file_inode(bprm->file); |
1da177e4 LT |
433 | |
434 | text_len = ntohl(hdr->data_start); | |
435 | data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); | |
436 | bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); | |
437 | stack_len = ntohl(hdr->stack_size); | |
438 | if (extra_stack) { | |
439 | stack_len += *extra_stack; | |
440 | *extra_stack = stack_len; | |
441 | } | |
442 | relocs = ntohl(hdr->reloc_count); | |
443 | flags = ntohl(hdr->flags); | |
444 | rev = ntohl(hdr->rev); | |
3dc20cb2 | 445 | full_data = data_len + relocs * sizeof(unsigned long); |
1da177e4 | 446 | |
845884d3 | 447 | if (strncmp(hdr->magic, "bFLT", 4)) { |
1da177e4 | 448 | /* |
e2a366dc MF |
449 | * Previously, here was a printk to tell people |
450 | * "BINFMT_FLAT: bad header magic". | |
451 | * But for the kernel which also use ELF FD-PIC format, this | |
452 | * error message is confusing. | |
1da177e4 | 453 | * because a lot of people do not manage to produce good |
1da177e4 | 454 | */ |
1ad3dcc0 LY |
455 | ret = -ENOEXEC; |
456 | goto err; | |
845884d3 GU |
457 | } |
458 | ||
459 | if (flags & FLAT_FLAG_KTRACE) | |
4adbb6ac | 460 | pr_info("Loading file: %s\n", bprm->filename); |
845884d3 GU |
461 | |
462 | if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) { | |
4adbb6ac NP |
463 | pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n", |
464 | rev, FLAT_VERSION, OLD_FLAT_VERSION); | |
1ad3dcc0 LY |
465 | ret = -ENOEXEC; |
466 | goto err; | |
1da177e4 | 467 | } |
13c3f50c | 468 | |
1da177e4 LT |
469 | /* Don't allow old format executables to use shared libraries */ |
470 | if (rev == OLD_FLAT_VERSION && id != 0) { | |
4adbb6ac NP |
471 | pr_err("shared libraries are not available before rev 0x%lx\n", |
472 | FLAT_VERSION); | |
1ad3dcc0 LY |
473 | ret = -ENOEXEC; |
474 | goto err; | |
1da177e4 LT |
475 | } |
476 | ||
c995ee28 NP |
477 | /* |
478 | * Make sure the header params are sane. | |
479 | * 28 bits (256 MB) is way more than reasonable in this case. | |
480 | * If some top bits are set we have probable binary corruption. | |
481 | */ | |
482 | if ((text_len | data_len | bss_len | stack_len | full_data) >> 28) { | |
483 | pr_err("bad header\n"); | |
484 | ret = -ENOEXEC; | |
485 | goto err; | |
486 | } | |
487 | ||
1da177e4 LT |
488 | /* |
489 | * fix up the flags for the older format, there were all kinds | |
490 | * of endian hacks, this only works for the simple cases | |
491 | */ | |
1d52dca1 CH |
492 | if (rev == OLD_FLAT_VERSION && |
493 | (flags || IS_ENABLED(CONFIG_BINFMT_FLAT_OLD_ALWAYS_RAM))) | |
1da177e4 LT |
494 | flags = FLAT_FLAG_RAM; |
495 | ||
496 | #ifndef CONFIG_BINFMT_ZFLAT | |
497 | if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { | |
4adbb6ac | 498 | pr_err("Support for ZFLAT executables is not enabled.\n"); |
1ad3dcc0 LY |
499 | ret = -ENOEXEC; |
500 | goto err; | |
1da177e4 LT |
501 | } |
502 | #endif | |
503 | ||
504 | /* | |
505 | * Check initial limits. This avoids letting people circumvent | |
506 | * size limits imposed on them by creating programs with large | |
507 | * arrays in the data or bss. | |
508 | */ | |
d554ed89 | 509 | rlim = rlimit(RLIMIT_DATA); |
1da177e4 LT |
510 | if (rlim >= RLIM_INFINITY) |
511 | rlim = ~0; | |
1ad3dcc0 LY |
512 | if (data_len + bss_len > rlim) { |
513 | ret = -ENOMEM; | |
514 | goto err; | |
515 | } | |
516 | ||
1da177e4 LT |
517 | /* Flush all traces of the currently running executable */ |
518 | if (id == 0) { | |
13c3f50c NP |
519 | ret = flush_old_exec(bprm); |
520 | if (ret) | |
df88912a | 521 | goto err; |
1da177e4 LT |
522 | |
523 | /* OK, This is the point of no return */ | |
fcc18e83 | 524 | set_personality(PER_LINUX_32BIT); |
221af7f8 | 525 | setup_new_exec(bprm); |
1da177e4 LT |
526 | } |
527 | ||
528 | /* | |
529 | * calculate the extra space we need to map in | |
530 | */ | |
0e647c04 AM |
531 | extra = max_t(unsigned long, bss_len + stack_len, |
532 | relocs * sizeof(unsigned long)); | |
1da177e4 LT |
533 | |
534 | /* | |
535 | * there are a couple of cases here, the separate code/data | |
536 | * case, and then the fully copied to RAM case which lumps | |
537 | * it all together. | |
538 | */ | |
015feacf | 539 | if (!IS_ENABLED(CONFIG_MMU) && !(flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP))) { |
1da177e4 LT |
540 | /* |
541 | * this should give us a ROM ptr, but if it doesn't we don't | |
542 | * really care | |
543 | */ | |
4adbb6ac | 544 | pr_debug("ROM mapping of file (we hope)\n"); |
1da177e4 | 545 | |
6be5ceb0 | 546 | textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, |
925d1c40 | 547 | MAP_PRIVATE|MAP_EXECUTABLE, 0); |
0b8c78f2 | 548 | if (!textpos || IS_ERR_VALUE(textpos)) { |
1ad3dcc0 | 549 | ret = textpos; |
13c3f50c NP |
550 | if (!textpos) |
551 | ret = -ENOMEM; | |
4adbb6ac | 552 | pr_err("Unable to mmap process text, errno %d\n", ret); |
df88912a | 553 | goto err; |
1da177e4 LT |
554 | } |
555 | ||
72613e5f | 556 | len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); |
0f3e442a | 557 | len = PAGE_ALIGN(len); |
13c3f50c | 558 | realdatastart = vm_mmap(NULL, 0, len, |
72613e5f | 559 | PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); |
1da177e4 | 560 | |
0b8c78f2 | 561 | if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) { |
13c3f50c | 562 | ret = realdatastart; |
1da177e4 | 563 | if (!realdatastart) |
13c3f50c | 564 | ret = -ENOMEM; |
4adbb6ac | 565 | pr_err("Unable to allocate RAM for process data, " |
13c3f50c | 566 | "errno %d\n", ret); |
7696e0c3 | 567 | vm_munmap(textpos, text_len); |
df88912a | 568 | goto err; |
1da177e4 | 569 | } |
c3dc5bec OS |
570 | datapos = ALIGN(realdatastart + |
571 | MAX_SHARED_LIBS * sizeof(unsigned long), | |
572 | FLAT_DATA_ALIGN); | |
1da177e4 | 573 | |
a8605423 | 574 | pr_debug("Allocated data+bss+stack (%u bytes): %lx\n", |
4adbb6ac | 575 | data_len + bss_len + stack_len, datapos); |
1da177e4 LT |
576 | |
577 | fpos = ntohl(hdr->data_start); | |
578 | #ifdef CONFIG_BINFMT_ZFLAT | |
579 | if (flags & FLAT_FLAG_GZDATA) { | |
13c3f50c | 580 | result = decompress_exec(bprm, fpos, (char *)datapos, |
3dc20cb2 | 581 | full_data, 0); |
1da177e4 LT |
582 | } else |
583 | #endif | |
584 | { | |
3dc20cb2 AV |
585 | result = read_code(bprm->file, datapos, fpos, |
586 | full_data); | |
1da177e4 | 587 | } |
0b8c78f2 | 588 | if (IS_ERR_VALUE(result)) { |
13c3f50c | 589 | ret = result; |
4adbb6ac | 590 | pr_err("Unable to read data+bss, errno %d\n", ret); |
7696e0c3 AV |
591 | vm_munmap(textpos, text_len); |
592 | vm_munmap(realdatastart, len); | |
df88912a | 593 | goto err; |
1da177e4 LT |
594 | } |
595 | ||
468138d7 | 596 | reloc = (u32 __user *) |
13c3f50c | 597 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
1da177e4 | 598 | memp = realdatastart; |
0f3e442a | 599 | memp_size = len; |
1da177e4 LT |
600 | } else { |
601 | ||
468138d7 | 602 | len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(u32); |
0f3e442a | 603 | len = PAGE_ALIGN(len); |
13c3f50c | 604 | textpos = vm_mmap(NULL, 0, len, |
72613e5f | 605 | PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); |
72613e5f | 606 | |
0b8c78f2 | 607 | if (!textpos || IS_ERR_VALUE(textpos)) { |
1ad3dcc0 | 608 | ret = textpos; |
13c3f50c NP |
609 | if (!textpos) |
610 | ret = -ENOMEM; | |
4adbb6ac | 611 | pr_err("Unable to allocate RAM for process text/data, " |
13c3f50c | 612 | "errno %d\n", ret); |
df88912a | 613 | goto err; |
1da177e4 LT |
614 | } |
615 | ||
616 | realdatastart = textpos + ntohl(hdr->data_start); | |
c3dc5bec | 617 | datapos = ALIGN(realdatastart + |
468138d7 | 618 | MAX_SHARED_LIBS * sizeof(u32), |
c3dc5bec OS |
619 | FLAT_DATA_ALIGN); |
620 | ||
468138d7 | 621 | reloc = (u32 __user *) |
c3dc5bec | 622 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
1da177e4 | 623 | memp = textpos; |
0f3e442a | 624 | memp_size = len; |
1da177e4 LT |
625 | #ifdef CONFIG_BINFMT_ZFLAT |
626 | /* | |
627 | * load it all in and treat it like a RAM load from now on | |
628 | */ | |
629 | if (flags & FLAT_FLAG_GZIP) { | |
472f95f3 | 630 | #ifndef CONFIG_MMU |
13c3f50c NP |
631 | result = decompress_exec(bprm, sizeof(struct flat_hdr), |
632 | (((char *)textpos) + sizeof(struct flat_hdr)), | |
3dc20cb2 | 633 | (text_len + full_data |
13c3f50c | 634 | - sizeof(struct flat_hdr)), |
1da177e4 LT |
635 | 0); |
636 | memmove((void *) datapos, (void *) realdatastart, | |
3dc20cb2 | 637 | full_data); |
472f95f3 NP |
638 | #else |
639 | /* | |
640 | * This is used on MMU systems mainly for testing. | |
641 | * Let's use a kernel buffer to simplify things. | |
642 | */ | |
643 | long unz_text_len = text_len - sizeof(struct flat_hdr); | |
644 | long unz_len = unz_text_len + full_data; | |
645 | char *unz_data = vmalloc(unz_len); | |
646 | if (!unz_data) { | |
647 | result = -ENOMEM; | |
648 | } else { | |
649 | result = decompress_exec(bprm, sizeof(struct flat_hdr), | |
650 | unz_data, unz_len, 0); | |
651 | if (result == 0 && | |
652 | (copy_to_user((void __user *)textpos + sizeof(struct flat_hdr), | |
653 | unz_data, unz_text_len) || | |
654 | copy_to_user((void __user *)datapos, | |
655 | unz_data + unz_text_len, full_data))) | |
656 | result = -EFAULT; | |
657 | vfree(unz_data); | |
658 | } | |
659 | #endif | |
1da177e4 | 660 | } else if (flags & FLAT_FLAG_GZDATA) { |
3dc20cb2 | 661 | result = read_code(bprm->file, textpos, 0, text_len); |
472f95f3 NP |
662 | if (!IS_ERR_VALUE(result)) { |
663 | #ifndef CONFIG_MMU | |
1da177e4 | 664 | result = decompress_exec(bprm, text_len, (char *) datapos, |
3dc20cb2 | 665 | full_data, 0); |
472f95f3 NP |
666 | #else |
667 | char *unz_data = vmalloc(full_data); | |
668 | if (!unz_data) { | |
669 | result = -ENOMEM; | |
670 | } else { | |
671 | result = decompress_exec(bprm, text_len, | |
672 | unz_data, full_data, 0); | |
673 | if (result == 0 && | |
674 | copy_to_user((void __user *)datapos, | |
675 | unz_data, full_data)) | |
676 | result = -EFAULT; | |
677 | vfree(unz_data); | |
678 | } | |
1da177e4 | 679 | #endif |
472f95f3 NP |
680 | } |
681 | } else | |
682 | #endif /* CONFIG_BINFMT_ZFLAT */ | |
1da177e4 | 683 | { |
3dc20cb2 AV |
684 | result = read_code(bprm->file, textpos, 0, text_len); |
685 | if (!IS_ERR_VALUE(result)) | |
686 | result = read_code(bprm->file, datapos, | |
687 | ntohl(hdr->data_start), | |
688 | full_data); | |
1da177e4 | 689 | } |
0b8c78f2 | 690 | if (IS_ERR_VALUE(result)) { |
13c3f50c | 691 | ret = result; |
4adbb6ac | 692 | pr_err("Unable to read code+data+bss, errno %d\n", ret); |
7696e0c3 | 693 | vm_munmap(textpos, text_len + data_len + extra + |
468138d7 | 694 | MAX_SHARED_LIBS * sizeof(u32)); |
df88912a | 695 | goto err; |
1da177e4 LT |
696 | } |
697 | } | |
698 | ||
13c3f50c NP |
699 | start_code = textpos + sizeof(struct flat_hdr); |
700 | end_code = textpos + text_len; | |
701 | text_len -= sizeof(struct flat_hdr); /* the real code len */ | |
1da177e4 LT |
702 | |
703 | /* The main program needs a little extra setup in the task structure */ | |
1da177e4 LT |
704 | if (id == 0) { |
705 | current->mm->start_code = start_code; | |
706 | current->mm->end_code = end_code; | |
707 | current->mm->start_data = datapos; | |
708 | current->mm->end_data = datapos + data_len; | |
709 | /* | |
710 | * set up the brk stuff, uses any slack left in data/bss/stack | |
711 | * allocation. We put the brk after the bss (between the bss | |
712 | * and stack) like other platforms. | |
0f3e442a DH |
713 | * Userspace code relies on the stack pointer starting out at |
714 | * an address right at the end of a page. | |
1da177e4 LT |
715 | */ |
716 | current->mm->start_brk = datapos + data_len + bss_len; | |
717 | current->mm->brk = (current->mm->start_brk + 3) & ~3; | |
015feacf | 718 | #ifndef CONFIG_MMU |
0f3e442a | 719 | current->mm->context.end_brk = memp + memp_size - stack_len; |
015feacf | 720 | #endif |
1da177e4 LT |
721 | } |
722 | ||
13c3f50c | 723 | if (flags & FLAT_FLAG_KTRACE) { |
4adbb6ac NP |
724 | pr_info("Mapping is %lx, Entry point is %x, data_start is %x\n", |
725 | textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); | |
726 | pr_info("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n", | |
727 | id ? "Lib" : "Load", bprm->filename, | |
728 | start_code, end_code, datapos, datapos + data_len, | |
729 | datapos + data_len, (datapos + data_len + bss_len + 3) & ~3); | |
13c3f50c | 730 | } |
1da177e4 LT |
731 | |
732 | /* Store the current module values into the global library structure */ | |
733 | libinfo->lib_list[id].start_code = start_code; | |
734 | libinfo->lib_list[id].start_data = datapos; | |
735 | libinfo->lib_list[id].start_brk = datapos + data_len + bss_len; | |
736 | libinfo->lib_list[id].text_len = text_len; | |
737 | libinfo->lib_list[id].loaded = 1; | |
738 | libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; | |
739 | libinfo->lib_list[id].build_date = ntohl(hdr->build_date); | |
13c3f50c | 740 | |
1da177e4 LT |
741 | /* |
742 | * We just load the allocations into some temporary memory to | |
743 | * help simplify all this mumbo jumbo | |
744 | * | |
745 | * We've got two different sections of relocation entries. | |
25985edc | 746 | * The first is the GOT which resides at the beginning of the data segment |
1da177e4 LT |
747 | * and is terminated with a -1. This one can be relocated in place. |
748 | * The second is the extra relocation entries tacked after the image's | |
749 | * data segment. These require a little more processing as the entry is | |
750 | * really an offset into the image which contains an offset into the | |
751 | * image. | |
752 | */ | |
753 | if (flags & FLAT_FLAG_GOTPIC) { | |
468138d7 AV |
754 | for (rp = (u32 __user *)datapos; ; rp++) { |
755 | u32 addr, rp_val; | |
6e572ffe NP |
756 | if (get_user(rp_val, rp)) |
757 | return -EFAULT; | |
758 | if (rp_val == 0xffffffff) | |
759 | break; | |
760 | if (rp_val) { | |
761 | addr = calc_reloc(rp_val, libinfo, id, 0); | |
1ad3dcc0 LY |
762 | if (addr == RELOC_FAILED) { |
763 | ret = -ENOEXEC; | |
df88912a | 764 | goto err; |
1ad3dcc0 | 765 | } |
6e572ffe NP |
766 | if (put_user(addr, rp)) |
767 | return -EFAULT; | |
1da177e4 LT |
768 | } |
769 | } | |
770 | } | |
771 | ||
772 | /* | |
773 | * Now run through the relocation entries. | |
774 | * We've got to be careful here as C++ produces relocatable zero | |
775 | * entries in the constructor and destructor tables which are then | |
776 | * tested for being not zero (which will always occur unless we're | |
777 | * based from address zero). This causes an endless loop as __start | |
778 | * is at zero. The solution used is to not relocate zero addresses. | |
779 | * This has the negative side effect of not allowing a global data | |
780 | * reference to be statically initialised to _stext (I've moved | |
781 | * __start to address 4 so that is okay). | |
782 | */ | |
783 | if (rev > OLD_FLAT_VERSION) { | |
468138d7 | 784 | u32 __maybe_unused persistent = 0; |
13c3f50c | 785 | for (i = 0; i < relocs; i++) { |
468138d7 | 786 | u32 addr, relval; |
1da177e4 | 787 | |
13c3f50c NP |
788 | /* |
789 | * Get the address of the pointer to be | |
790 | * relocated (of course, the address has to be | |
791 | * relocated first). | |
792 | */ | |
6e572ffe NP |
793 | if (get_user(relval, reloc + i)) |
794 | return -EFAULT; | |
795 | relval = ntohl(relval); | |
1da177e4 | 796 | addr = flat_get_relocate_addr(relval); |
468138d7 AV |
797 | rp = (u32 __user *)calc_reloc(addr, libinfo, id, 1); |
798 | if (rp == (u32 __user *)RELOC_FAILED) { | |
1ad3dcc0 | 799 | ret = -ENOEXEC; |
df88912a | 800 | goto err; |
1ad3dcc0 | 801 | } |
1da177e4 LT |
802 | |
803 | /* Get the pointer's value. */ | |
468138d7 AV |
804 | ret = flat_get_addr_from_rp(rp, relval, flags, |
805 | &addr, &persistent); | |
806 | if (unlikely(ret)) | |
807 | goto err; | |
808 | ||
1da177e4 LT |
809 | if (addr != 0) { |
810 | /* | |
811 | * Do the relocation. PIC relocs in the data section are | |
812 | * already in target order | |
813 | */ | |
814 | if ((flags & FLAT_FLAG_GOTPIC) == 0) | |
815 | addr = ntohl(addr); | |
816 | addr = calc_reloc(addr, libinfo, id, 0); | |
1ad3dcc0 LY |
817 | if (addr == RELOC_FAILED) { |
818 | ret = -ENOEXEC; | |
df88912a | 819 | goto err; |
1ad3dcc0 | 820 | } |
1da177e4 LT |
821 | |
822 | /* Write back the relocated pointer. */ | |
468138d7 AV |
823 | ret = flat_put_addr_at_rp(rp, addr, relval); |
824 | if (unlikely(ret)) | |
825 | goto err; | |
1da177e4 LT |
826 | } |
827 | } | |
828 | } else { | |
1b2ce442 | 829 | for (i = 0; i < relocs; i++) { |
468138d7 | 830 | u32 relval; |
1b2ce442 NP |
831 | if (get_user(relval, reloc + i)) |
832 | return -EFAULT; | |
833 | relval = ntohl(relval); | |
834 | old_reloc(relval); | |
835 | } | |
1da177e4 | 836 | } |
13c3f50c | 837 | |
1da177e4 LT |
838 | flush_icache_range(start_code, end_code); |
839 | ||
840 | /* zero the BSS, BRK and stack areas */ | |
467aa146 NP |
841 | if (clear_user((void __user *)(datapos + data_len), bss_len + |
842 | (memp + memp_size - stack_len - /* end brk */ | |
843 | libinfo->lib_list[id].start_brk) + /* start brk */ | |
844 | stack_len)) | |
845 | return -EFAULT; | |
1da177e4 LT |
846 | |
847 | return 0; | |
1ad3dcc0 LY |
848 | err: |
849 | return ret; | |
1da177e4 LT |
850 | } |
851 | ||
852 | ||
853 | /****************************************************************************/ | |
854 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
855 | ||
856 | /* | |
857 | * Load a shared library into memory. The library gets its own data | |
858 | * segment (including bss) but not argv/argc/environ. | |
859 | */ | |
860 | ||
861 | static int load_flat_shared_library(int id, struct lib_info *libs) | |
862 | { | |
863 | struct linux_binprm bprm; | |
864 | int res; | |
865 | char buf[16]; | |
866 | ||
3a852d3b DH |
867 | memset(&bprm, 0, sizeof(bprm)); |
868 | ||
1da177e4 LT |
869 | /* Create the file name */ |
870 | sprintf(buf, "/lib/lib%d.so", id); | |
871 | ||
872 | /* Open the file up */ | |
873 | bprm.filename = buf; | |
874 | bprm.file = open_exec(bprm.filename); | |
875 | res = PTR_ERR(bprm.file); | |
876 | if (IS_ERR(bprm.file)) | |
877 | return res; | |
878 | ||
3440625d LT |
879 | bprm.cred = prepare_exec_creds(); |
880 | res = -ENOMEM; | |
881 | if (!bprm.cred) | |
882 | goto out; | |
883 | ||
3a852d3b DH |
884 | /* We don't really care about recalculating credentials at this point |
885 | * as we're past the point of no return and are dealing with shared | |
886 | * libraries. | |
887 | */ | |
ddb4a144 | 888 | bprm.called_set_creds = 1; |
3a852d3b | 889 | |
1da177e4 LT |
890 | res = prepare_binprm(&bprm); |
891 | ||
287980e4 | 892 | if (!res) |
1da177e4 | 893 | res = load_flat_file(&bprm, libs, id, NULL); |
3440625d LT |
894 | |
895 | abort_creds(bprm.cred); | |
896 | ||
897 | out: | |
898 | allow_write_access(bprm.file); | |
899 | fput(bprm.file); | |
900 | ||
13c3f50c | 901 | return res; |
1da177e4 LT |
902 | } |
903 | ||
904 | #endif /* CONFIG_BINFMT_SHARED_FLAT */ | |
905 | /****************************************************************************/ | |
906 | ||
907 | /* | |
908 | * These are the functions used to load flat style executables and shared | |
909 | * libraries. There is no binary dependent code anywhere else. | |
910 | */ | |
911 | ||
13c3f50c | 912 | static int load_flat_binary(struct linux_binprm *bprm) |
1da177e4 LT |
913 | { |
914 | struct lib_info libinfo; | |
71613c3b | 915 | struct pt_regs *regs = current_pt_regs(); |
015feacf | 916 | unsigned long stack_len = 0; |
1da177e4 | 917 | unsigned long start_addr; |
1da177e4 LT |
918 | int res; |
919 | int i, j; | |
920 | ||
921 | memset(&libinfo, 0, sizeof(libinfo)); | |
13c3f50c | 922 | |
1da177e4 LT |
923 | /* |
924 | * We have to add the size of our arguments to our stack size | |
925 | * otherwise it's too easy for users to create stack overflows | |
926 | * by passing in a huge argument list. And yes, we have to be | |
927 | * pedantic and include space for the argv/envp array as it may have | |
928 | * a lot of entries. | |
929 | */ | |
015feacf NP |
930 | #ifndef CONFIG_MMU |
931 | stack_len += PAGE_SIZE * MAX_ARG_PAGES - bprm->p; /* the strings */ | |
932 | #endif | |
a97d157d NP |
933 | stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */ |
934 | stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */ | |
935 | stack_len = ALIGN(stack_len, FLAT_STACK_ALIGN); | |
13c3f50c | 936 | |
1da177e4 | 937 | res = load_flat_file(bprm, &libinfo, 0, &stack_len); |
287980e4 | 938 | if (res < 0) |
1da177e4 | 939 | return res; |
13c3f50c | 940 | |
1da177e4 | 941 | /* Update data segment pointers for all libraries */ |
af521f92 NP |
942 | for (i = 0; i < MAX_SHARED_LIBS; i++) { |
943 | if (!libinfo.lib_list[i].loaded) | |
944 | continue; | |
945 | for (j = 0; j < MAX_SHARED_LIBS; j++) { | |
946 | unsigned long val = libinfo.lib_list[j].loaded ? | |
947 | libinfo.lib_list[j].start_data : UNLOADED_LIB; | |
948 | unsigned long __user *p = (unsigned long __user *) | |
949 | libinfo.lib_list[i].start_data; | |
950 | p -= j + 1; | |
951 | if (put_user(val, p)) | |
952 | return -EFAULT; | |
953 | } | |
954 | } | |
1da177e4 | 955 | |
a6f76f23 | 956 | install_exec_creds(bprm); |
1da177e4 LT |
957 | |
958 | set_binfmt(&flat_format); | |
959 | ||
015feacf NP |
960 | #ifdef CONFIG_MMU |
961 | res = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT); | |
962 | if (!res) | |
963 | res = create_flat_tables(bprm, bprm->p); | |
964 | #else | |
a97d157d NP |
965 | /* Stash our initial stack pointer into the mm structure */ |
966 | current->mm->start_stack = | |
967 | ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; | |
968 | pr_debug("sp=%lx\n", current->mm->start_stack); | |
1da177e4 | 969 | |
687fd773 | 970 | /* copy the arg pages onto the stack */ |
a97d157d NP |
971 | res = transfer_args_to_stack(bprm, ¤t->mm->start_stack); |
972 | if (!res) | |
973 | res = create_flat_tables(bprm, current->mm->start_stack); | |
015feacf | 974 | #endif |
687fd773 NP |
975 | if (res) |
976 | return res; | |
1da177e4 | 977 | |
1da177e4 LT |
978 | /* Fake some return addresses to ensure the call chain will |
979 | * initialise library in order for us. We are required to call | |
980 | * lib 1 first, then 2, ... and finally the main program (id 0). | |
981 | */ | |
982 | start_addr = libinfo.lib_list[0].entry; | |
983 | ||
984 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
13c3f50c | 985 | for (i = MAX_SHARED_LIBS-1; i > 0; i--) { |
1da177e4 LT |
986 | if (libinfo.lib_list[i].loaded) { |
987 | /* Push previos first to call address */ | |
a97d157d NP |
988 | unsigned long __user *sp; |
989 | current->mm->start_stack -= sizeof(unsigned long); | |
990 | sp = (unsigned long __user *)current->mm->start_stack; | |
991 | __put_user(start_addr, sp); | |
1da177e4 LT |
992 | start_addr = libinfo.lib_list[i].entry; |
993 | } | |
994 | } | |
995 | #endif | |
13c3f50c | 996 | |
74c27c43 TY |
997 | #ifdef FLAT_PLAT_INIT |
998 | FLAT_PLAT_INIT(regs); | |
999 | #endif | |
13c3f50c | 1000 | |
b8383831 | 1001 | finalize_exec(bprm); |
4adbb6ac NP |
1002 | pr_debug("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n", |
1003 | regs, start_addr, current->mm->start_stack); | |
1da177e4 LT |
1004 | start_thread(regs, start_addr, current->mm->start_stack); |
1005 | ||
1da177e4 LT |
1006 | return 0; |
1007 | } | |
1008 | ||
1009 | /****************************************************************************/ | |
1010 | ||
1011 | static int __init init_flat_binfmt(void) | |
1012 | { | |
8fc3dc5a AV |
1013 | register_binfmt(&flat_format); |
1014 | return 0; | |
1da177e4 | 1015 | } |
1da177e4 | 1016 | core_initcall(init_flat_binfmt); |
1da177e4 LT |
1017 | |
1018 | /****************************************************************************/ |