Commit | Line | Data |
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1da177e4 LT |
1 | /****************************************************************************/ |
2 | /* | |
3 | * linux/fs/binfmt_flat.c | |
4 | * | |
5 | * Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com> | |
6 | * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com> | |
7 | * Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com> | |
8 | * Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com> | |
9 | * based heavily on: | |
10 | * | |
11 | * linux/fs/binfmt_aout.c: | |
12 | * Copyright (C) 1991, 1992, 1996 Linus Torvalds | |
13 | * linux/fs/binfmt_flat.c for 2.0 kernel | |
14 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> | |
15 | * JAN/99 -- coded full program relocation (gerg@snapgear.com) | |
16 | */ | |
17 | ||
4adbb6ac NP |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
19 | ||
1da177e4 LT |
20 | #include <linux/kernel.h> |
21 | #include <linux/sched.h> | |
68db0cf1 | 22 | #include <linux/sched/task_stack.h> |
1da177e4 LT |
23 | #include <linux/mm.h> |
24 | #include <linux/mman.h> | |
1da177e4 LT |
25 | #include <linux/errno.h> |
26 | #include <linux/signal.h> | |
27 | #include <linux/string.h> | |
28 | #include <linux/fs.h> | |
29 | #include <linux/file.h> | |
1da177e4 LT |
30 | #include <linux/ptrace.h> |
31 | #include <linux/user.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/binfmts.h> | |
34 | #include <linux/personality.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/flat.h> | |
13c3f50c | 37 | #include <linux/uaccess.h> |
472f95f3 | 38 | #include <linux/vmalloc.h> |
1da177e4 LT |
39 | |
40 | #include <asm/byteorder.h> | |
1da177e4 LT |
41 | #include <asm/unaligned.h> |
42 | #include <asm/cacheflush.h> | |
c3dc5bec | 43 | #include <asm/page.h> |
1da177e4 LT |
44 | |
45 | /****************************************************************************/ | |
46 | ||
c3dc5bec | 47 | /* |
2e94de8a MF |
48 | * User data (data section and bss) needs to be aligned. |
49 | * We pick 0x20 here because it is the max value elf2flt has always | |
50 | * used in producing FLAT files, and because it seems to be large | |
51 | * enough to make all the gcc alignment related tests happy. | |
52 | */ | |
53 | #define FLAT_DATA_ALIGN (0x20) | |
54 | ||
55 | /* | |
56 | * User data (stack) also needs to be aligned. | |
57 | * Here we can be a bit looser than the data sections since this | |
58 | * needs to only meet arch ABI requirements. | |
c3dc5bec | 59 | */ |
2952095c | 60 | #define FLAT_STACK_ALIGN max_t(unsigned long, sizeof(void *), ARCH_SLAB_MINALIGN) |
c3dc5bec | 61 | |
1da177e4 LT |
62 | #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ |
63 | #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ | |
64 | ||
65 | struct lib_info { | |
66 | struct { | |
67 | unsigned long start_code; /* Start of text segment */ | |
68 | unsigned long start_data; /* Start of data segment */ | |
69 | unsigned long start_brk; /* End of data segment */ | |
70 | unsigned long text_len; /* Length of text segment */ | |
71 | unsigned long entry; /* Start address for this module */ | |
72 | unsigned long build_date; /* When this one was compiled */ | |
13c3f50c | 73 | bool loaded; /* Has this library been loaded? */ |
1da177e4 LT |
74 | } lib_list[MAX_SHARED_LIBS]; |
75 | }; | |
76 | ||
77 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
78 | static int load_flat_shared_library(int id, struct lib_info *p); | |
79 | #endif | |
80 | ||
71613c3b | 81 | static int load_flat_binary(struct linux_binprm *); |
f6151dfe | 82 | static int flat_core_dump(struct coredump_params *cprm); |
1da177e4 | 83 | |
1da177e4 LT |
84 | static struct linux_binfmt flat_format = { |
85 | .module = THIS_MODULE, | |
86 | .load_binary = load_flat_binary, | |
87 | .core_dump = flat_core_dump, | |
88 | .min_coredump = PAGE_SIZE | |
89 | }; | |
90 | ||
91 | /****************************************************************************/ | |
92 | /* | |
93 | * Routine writes a core dump image in the current directory. | |
94 | * Currently only a stub-function. | |
95 | */ | |
96 | ||
f6151dfe | 97 | static int flat_core_dump(struct coredump_params *cprm) |
1da177e4 | 98 | { |
4adbb6ac NP |
99 | pr_warn("Process %s:%d received signr %d and should have core dumped\n", |
100 | current->comm, current->pid, cprm->siginfo->si_signo); | |
13c3f50c | 101 | return 1; |
1da177e4 LT |
102 | } |
103 | ||
104 | /****************************************************************************/ | |
105 | /* | |
106 | * create_flat_tables() parses the env- and arg-strings in new user | |
107 | * memory and creates the pointer tables from them, and puts their | |
a97d157d | 108 | * addresses on the "stack", recording the new stack pointer value. |
1da177e4 LT |
109 | */ |
110 | ||
a97d157d | 111 | static int create_flat_tables(struct linux_binprm *bprm, unsigned long arg_start) |
1da177e4 | 112 | { |
a97d157d NP |
113 | char __user *p; |
114 | unsigned long __user *sp; | |
115 | long i, len; | |
1da177e4 | 116 | |
a97d157d NP |
117 | p = (char __user *)arg_start; |
118 | sp = (unsigned long __user *)current->mm->start_stack; | |
119 | ||
120 | sp -= bprm->envc + 1; | |
121 | sp -= bprm->argc + 1; | |
122 | sp -= flat_argvp_envp_on_stack() ? 2 : 0; | |
123 | sp -= 1; /* &argc */ | |
124 | ||
125 | current->mm->start_stack = (unsigned long)sp & -FLAT_STACK_ALIGN; | |
126 | sp = (unsigned long __user *)current->mm->start_stack; | |
127 | ||
128 | __put_user(bprm->argc, sp++); | |
1da177e4 | 129 | if (flat_argvp_envp_on_stack()) { |
a97d157d NP |
130 | unsigned long argv, envp; |
131 | argv = (unsigned long)(sp + 2); | |
132 | envp = (unsigned long)(sp + 2 + bprm->argc + 1); | |
133 | __put_user(argv, sp++); | |
134 | __put_user(envp, sp++); | |
135 | } | |
136 | ||
137 | current->mm->arg_start = (unsigned long)p; | |
138 | for (i = bprm->argc; i > 0; i--) { | |
139 | __put_user((unsigned long)p, sp++); | |
140 | len = strnlen_user(p, MAX_ARG_STRLEN); | |
141 | if (!len || len > MAX_ARG_STRLEN) | |
142 | return -EINVAL; | |
143 | p += len; | |
144 | } | |
145 | __put_user(0, sp++); | |
146 | current->mm->arg_end = (unsigned long)p; | |
147 | ||
148 | current->mm->env_start = (unsigned long) p; | |
149 | for (i = bprm->envc; i > 0; i--) { | |
150 | __put_user((unsigned long)p, sp++); | |
151 | len = strnlen_user(p, MAX_ARG_STRLEN); | |
152 | if (!len || len > MAX_ARG_STRLEN) | |
153 | return -EINVAL; | |
154 | p += len; | |
155 | } | |
156 | __put_user(0, sp++); | |
157 | current->mm->env_end = (unsigned long)p; | |
158 | ||
159 | return 0; | |
1da177e4 LT |
160 | } |
161 | ||
162 | /****************************************************************************/ | |
163 | ||
164 | #ifdef CONFIG_BINFMT_ZFLAT | |
165 | ||
166 | #include <linux/zlib.h> | |
167 | ||
168 | #define LBUFSIZE 4000 | |
169 | ||
170 | /* gzip flag byte */ | |
171 | #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ | |
172 | #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ | |
173 | #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ | |
174 | #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ | |
175 | #define COMMENT 0x10 /* bit 4 set: file comment present */ | |
176 | #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ | |
177 | #define RESERVED 0xC0 /* bit 6,7: reserved */ | |
178 | ||
bdd1d2d3 CH |
179 | static int decompress_exec(struct linux_binprm *bprm, loff_t fpos, char *dst, |
180 | long len, int fd) | |
1da177e4 LT |
181 | { |
182 | unsigned char *buf; | |
183 | z_stream strm; | |
1da177e4 LT |
184 | int ret, retval; |
185 | ||
bdd1d2d3 | 186 | pr_debug("decompress_exec(offset=%llx,buf=%p,len=%lx)\n", fpos, dst, len); |
1da177e4 LT |
187 | |
188 | memset(&strm, 0, sizeof(strm)); | |
189 | strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); | |
9367bb73 | 190 | if (!strm.workspace) |
1da177e4 | 191 | return -ENOMEM; |
9367bb73 | 192 | |
1da177e4 | 193 | buf = kmalloc(LBUFSIZE, GFP_KERNEL); |
9367bb73 | 194 | if (!buf) { |
1da177e4 LT |
195 | retval = -ENOMEM; |
196 | goto out_free; | |
197 | } | |
198 | ||
199 | /* Read in first chunk of data and parse gzip header. */ | |
bdd1d2d3 | 200 | ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos); |
1da177e4 LT |
201 | |
202 | strm.next_in = buf; | |
203 | strm.avail_in = ret; | |
204 | strm.total_in = 0; | |
205 | ||
206 | retval = -ENOEXEC; | |
207 | ||
208 | /* Check minimum size -- gzip header */ | |
209 | if (ret < 10) { | |
4adbb6ac | 210 | pr_debug("file too small?\n"); |
1da177e4 LT |
211 | goto out_free_buf; |
212 | } | |
213 | ||
214 | /* Check gzip magic number */ | |
215 | if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { | |
4adbb6ac | 216 | pr_debug("unknown compression magic?\n"); |
1da177e4 LT |
217 | goto out_free_buf; |
218 | } | |
219 | ||
220 | /* Check gzip method */ | |
221 | if (buf[2] != 8) { | |
4adbb6ac | 222 | pr_debug("unknown compression method?\n"); |
1da177e4 LT |
223 | goto out_free_buf; |
224 | } | |
225 | /* Check gzip flags */ | |
226 | if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || | |
227 | (buf[3] & RESERVED)) { | |
4adbb6ac | 228 | pr_debug("unknown flags?\n"); |
1da177e4 LT |
229 | goto out_free_buf; |
230 | } | |
231 | ||
232 | ret = 10; | |
233 | if (buf[3] & EXTRA_FIELD) { | |
234 | ret += 2 + buf[10] + (buf[11] << 8); | |
13c3f50c | 235 | if (unlikely(ret >= LBUFSIZE)) { |
4adbb6ac | 236 | pr_debug("buffer overflow (EXTRA)?\n"); |
1da177e4 LT |
237 | goto out_free_buf; |
238 | } | |
239 | } | |
240 | if (buf[3] & ORIG_NAME) { | |
f4cfb18d | 241 | while (ret < LBUFSIZE && buf[ret++] != 0) |
1da177e4 | 242 | ; |
13c3f50c | 243 | if (unlikely(ret == LBUFSIZE)) { |
4adbb6ac | 244 | pr_debug("buffer overflow (ORIG_NAME)?\n"); |
1da177e4 LT |
245 | goto out_free_buf; |
246 | } | |
247 | } | |
248 | if (buf[3] & COMMENT) { | |
f4cfb18d | 249 | while (ret < LBUFSIZE && buf[ret++] != 0) |
1da177e4 | 250 | ; |
13c3f50c | 251 | if (unlikely(ret == LBUFSIZE)) { |
4adbb6ac | 252 | pr_debug("buffer overflow (COMMENT)?\n"); |
1da177e4 LT |
253 | goto out_free_buf; |
254 | } | |
255 | } | |
256 | ||
257 | strm.next_in += ret; | |
258 | strm.avail_in -= ret; | |
259 | ||
260 | strm.next_out = dst; | |
261 | strm.avail_out = len; | |
262 | strm.total_out = 0; | |
263 | ||
264 | if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) { | |
4adbb6ac | 265 | pr_debug("zlib init failed?\n"); |
1da177e4 LT |
266 | goto out_free_buf; |
267 | } | |
268 | ||
269 | while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { | |
bdd1d2d3 | 270 | ret = kernel_read(bprm->file, buf, LBUFSIZE, &fpos); |
1da177e4 LT |
271 | if (ret <= 0) |
272 | break; | |
1da177e4 LT |
273 | len -= ret; |
274 | ||
275 | strm.next_in = buf; | |
276 | strm.avail_in = ret; | |
277 | strm.total_in = 0; | |
278 | } | |
279 | ||
280 | if (ret < 0) { | |
4adbb6ac | 281 | pr_debug("decompression failed (%d), %s\n", |
1da177e4 LT |
282 | ret, strm.msg); |
283 | goto out_zlib; | |
284 | } | |
285 | ||
286 | retval = 0; | |
287 | out_zlib: | |
288 | zlib_inflateEnd(&strm); | |
289 | out_free_buf: | |
290 | kfree(buf); | |
291 | out_free: | |
292 | kfree(strm.workspace); | |
1da177e4 LT |
293 | return retval; |
294 | } | |
295 | ||
296 | #endif /* CONFIG_BINFMT_ZFLAT */ | |
297 | ||
298 | /****************************************************************************/ | |
299 | ||
300 | static unsigned long | |
301 | calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp) | |
302 | { | |
303 | unsigned long addr; | |
304 | int id; | |
305 | unsigned long start_brk; | |
306 | unsigned long start_data; | |
307 | unsigned long text_len; | |
308 | unsigned long start_code; | |
309 | ||
310 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
311 | if (r == 0) | |
312 | id = curid; /* Relocs of 0 are always self referring */ | |
313 | else { | |
314 | id = (r >> 24) & 0xff; /* Find ID for this reloc */ | |
315 | r &= 0x00ffffff; /* Trim ID off here */ | |
316 | } | |
317 | if (id >= MAX_SHARED_LIBS) { | |
4adbb6ac | 318 | pr_err("reference 0x%lx to shared library %d", r, id); |
1da177e4 LT |
319 | goto failed; |
320 | } | |
321 | if (curid != id) { | |
322 | if (internalp) { | |
4adbb6ac NP |
323 | pr_err("reloc address 0x%lx not in same module " |
324 | "(%d != %d)", r, curid, id); | |
1da177e4 | 325 | goto failed; |
13c3f50c NP |
326 | } else if (!p->lib_list[id].loaded && |
327 | load_flat_shared_library(id, p) < 0) { | |
4adbb6ac | 328 | pr_err("failed to load library %d", id); |
1da177e4 LT |
329 | goto failed; |
330 | } | |
331 | /* Check versioning information (i.e. time stamps) */ | |
332 | if (p->lib_list[id].build_date && p->lib_list[curid].build_date && | |
333 | p->lib_list[curid].build_date < p->lib_list[id].build_date) { | |
4adbb6ac | 334 | pr_err("library %d is younger than %d", id, curid); |
1da177e4 LT |
335 | goto failed; |
336 | } | |
337 | } | |
338 | #else | |
339 | id = 0; | |
340 | #endif | |
341 | ||
342 | start_brk = p->lib_list[id].start_brk; | |
343 | start_data = p->lib_list[id].start_data; | |
344 | start_code = p->lib_list[id].start_code; | |
345 | text_len = p->lib_list[id].text_len; | |
346 | ||
347 | if (!flat_reloc_valid(r, start_brk - start_data + text_len)) { | |
4adbb6ac | 348 | pr_err("reloc outside program 0x%lx (0 - 0x%lx/0x%lx)", |
13c3f50c | 349 | r, start_brk-start_data+text_len, text_len); |
1da177e4 LT |
350 | goto failed; |
351 | } | |
352 | ||
353 | if (r < text_len) /* In text segment */ | |
354 | addr = r + start_code; | |
355 | else /* In data segment */ | |
356 | addr = r - text_len + start_data; | |
357 | ||
358 | /* Range checked already above so doing the range tests is redundant...*/ | |
13c3f50c | 359 | return addr; |
1da177e4 LT |
360 | |
361 | failed: | |
4adbb6ac | 362 | pr_cont(", killing %s!\n", current->comm); |
1da177e4 LT |
363 | send_sig(SIGSEGV, current, 0); |
364 | ||
365 | return RELOC_FAILED; | |
366 | } | |
367 | ||
368 | /****************************************************************************/ | |
369 | ||
34303435 | 370 | static void old_reloc(unsigned long rl) |
1da177e4 | 371 | { |
13c3f50c | 372 | static const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; |
1da177e4 | 373 | flat_v2_reloc_t r; |
1b2ce442 NP |
374 | unsigned long __user *ptr; |
375 | unsigned long val; | |
13c3f50c | 376 | |
1da177e4 LT |
377 | r.value = rl; |
378 | #if defined(CONFIG_COLDFIRE) | |
1b2ce442 | 379 | ptr = (unsigned long __user *)(current->mm->start_code + r.reloc.offset); |
1da177e4 | 380 | #else |
1b2ce442 | 381 | ptr = (unsigned long __user *)(current->mm->start_data + r.reloc.offset); |
1da177e4 | 382 | #endif |
1b2ce442 | 383 | get_user(val, ptr); |
1da177e4 | 384 | |
4adbb6ac NP |
385 | pr_debug("Relocation of variable at DATASEG+%x " |
386 | "(address %p, currently %lx) into segment %s\n", | |
1b2ce442 | 387 | r.reloc.offset, ptr, val, segment[r.reloc.type]); |
13c3f50c | 388 | |
1da177e4 LT |
389 | switch (r.reloc.type) { |
390 | case OLD_FLAT_RELOC_TYPE_TEXT: | |
1b2ce442 | 391 | val += current->mm->start_code; |
1da177e4 LT |
392 | break; |
393 | case OLD_FLAT_RELOC_TYPE_DATA: | |
1b2ce442 | 394 | val += current->mm->start_data; |
1da177e4 LT |
395 | break; |
396 | case OLD_FLAT_RELOC_TYPE_BSS: | |
1b2ce442 | 397 | val += current->mm->end_data; |
1da177e4 LT |
398 | break; |
399 | default: | |
4adbb6ac | 400 | pr_err("Unknown relocation type=%x\n", r.reloc.type); |
1da177e4 LT |
401 | break; |
402 | } | |
1b2ce442 | 403 | put_user(val, ptr); |
1da177e4 | 404 | |
1b2ce442 | 405 | pr_debug("Relocation became %lx\n", val); |
13c3f50c | 406 | } |
1da177e4 LT |
407 | |
408 | /****************************************************************************/ | |
409 | ||
13c3f50c | 410 | static int load_flat_file(struct linux_binprm *bprm, |
1da177e4 LT |
411 | struct lib_info *libinfo, int id, unsigned long *extra_stack) |
412 | { | |
13c3f50c NP |
413 | struct flat_hdr *hdr; |
414 | unsigned long textpos, datapos, realdatastart; | |
468138d7 | 415 | u32 text_len, data_len, bss_len, stack_len, full_data, flags; |
13c3f50c | 416 | unsigned long len, memp, memp_size, extra, rlim; |
468138d7 | 417 | u32 __user *reloc, *rp; |
1da177e4 | 418 | struct inode *inode; |
13c3f50c | 419 | int i, rev, relocs; |
1da177e4 LT |
420 | loff_t fpos; |
421 | unsigned long start_code, end_code; | |
13c3f50c | 422 | ssize_t result; |
1ad3dcc0 | 423 | int ret; |
1da177e4 LT |
424 | |
425 | hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ | |
496ad9aa | 426 | inode = file_inode(bprm->file); |
1da177e4 LT |
427 | |
428 | text_len = ntohl(hdr->data_start); | |
429 | data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); | |
430 | bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); | |
431 | stack_len = ntohl(hdr->stack_size); | |
432 | if (extra_stack) { | |
433 | stack_len += *extra_stack; | |
434 | *extra_stack = stack_len; | |
435 | } | |
436 | relocs = ntohl(hdr->reloc_count); | |
437 | flags = ntohl(hdr->flags); | |
438 | rev = ntohl(hdr->rev); | |
3dc20cb2 | 439 | full_data = data_len + relocs * sizeof(unsigned long); |
1da177e4 | 440 | |
845884d3 | 441 | if (strncmp(hdr->magic, "bFLT", 4)) { |
1da177e4 | 442 | /* |
e2a366dc MF |
443 | * Previously, here was a printk to tell people |
444 | * "BINFMT_FLAT: bad header magic". | |
445 | * But for the kernel which also use ELF FD-PIC format, this | |
446 | * error message is confusing. | |
1da177e4 | 447 | * because a lot of people do not manage to produce good |
1da177e4 | 448 | */ |
1ad3dcc0 LY |
449 | ret = -ENOEXEC; |
450 | goto err; | |
845884d3 GU |
451 | } |
452 | ||
453 | if (flags & FLAT_FLAG_KTRACE) | |
4adbb6ac | 454 | pr_info("Loading file: %s\n", bprm->filename); |
845884d3 GU |
455 | |
456 | if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) { | |
4adbb6ac NP |
457 | pr_err("bad flat file version 0x%x (supported 0x%lx and 0x%lx)\n", |
458 | rev, FLAT_VERSION, OLD_FLAT_VERSION); | |
1ad3dcc0 LY |
459 | ret = -ENOEXEC; |
460 | goto err; | |
1da177e4 | 461 | } |
13c3f50c | 462 | |
1da177e4 LT |
463 | /* Don't allow old format executables to use shared libraries */ |
464 | if (rev == OLD_FLAT_VERSION && id != 0) { | |
4adbb6ac NP |
465 | pr_err("shared libraries are not available before rev 0x%lx\n", |
466 | FLAT_VERSION); | |
1ad3dcc0 LY |
467 | ret = -ENOEXEC; |
468 | goto err; | |
1da177e4 LT |
469 | } |
470 | ||
c995ee28 NP |
471 | /* |
472 | * Make sure the header params are sane. | |
473 | * 28 bits (256 MB) is way more than reasonable in this case. | |
474 | * If some top bits are set we have probable binary corruption. | |
475 | */ | |
476 | if ((text_len | data_len | bss_len | stack_len | full_data) >> 28) { | |
477 | pr_err("bad header\n"); | |
478 | ret = -ENOEXEC; | |
479 | goto err; | |
480 | } | |
481 | ||
1da177e4 LT |
482 | /* |
483 | * fix up the flags for the older format, there were all kinds | |
484 | * of endian hacks, this only works for the simple cases | |
485 | */ | |
486 | if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags)) | |
487 | flags = FLAT_FLAG_RAM; | |
488 | ||
489 | #ifndef CONFIG_BINFMT_ZFLAT | |
490 | if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { | |
4adbb6ac | 491 | pr_err("Support for ZFLAT executables is not enabled.\n"); |
1ad3dcc0 LY |
492 | ret = -ENOEXEC; |
493 | goto err; | |
1da177e4 LT |
494 | } |
495 | #endif | |
496 | ||
497 | /* | |
498 | * Check initial limits. This avoids letting people circumvent | |
499 | * size limits imposed on them by creating programs with large | |
500 | * arrays in the data or bss. | |
501 | */ | |
d554ed89 | 502 | rlim = rlimit(RLIMIT_DATA); |
1da177e4 LT |
503 | if (rlim >= RLIM_INFINITY) |
504 | rlim = ~0; | |
1ad3dcc0 LY |
505 | if (data_len + bss_len > rlim) { |
506 | ret = -ENOMEM; | |
507 | goto err; | |
508 | } | |
509 | ||
1da177e4 LT |
510 | /* Flush all traces of the currently running executable */ |
511 | if (id == 0) { | |
13c3f50c NP |
512 | ret = flush_old_exec(bprm); |
513 | if (ret) | |
df88912a | 514 | goto err; |
1da177e4 LT |
515 | |
516 | /* OK, This is the point of no return */ | |
fcc18e83 | 517 | set_personality(PER_LINUX_32BIT); |
221af7f8 | 518 | setup_new_exec(bprm); |
1da177e4 LT |
519 | } |
520 | ||
521 | /* | |
522 | * calculate the extra space we need to map in | |
523 | */ | |
0e647c04 AM |
524 | extra = max_t(unsigned long, bss_len + stack_len, |
525 | relocs * sizeof(unsigned long)); | |
1da177e4 LT |
526 | |
527 | /* | |
528 | * there are a couple of cases here, the separate code/data | |
529 | * case, and then the fully copied to RAM case which lumps | |
530 | * it all together. | |
531 | */ | |
015feacf | 532 | if (!IS_ENABLED(CONFIG_MMU) && !(flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP))) { |
1da177e4 LT |
533 | /* |
534 | * this should give us a ROM ptr, but if it doesn't we don't | |
535 | * really care | |
536 | */ | |
4adbb6ac | 537 | pr_debug("ROM mapping of file (we hope)\n"); |
1da177e4 | 538 | |
6be5ceb0 | 539 | textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, |
925d1c40 | 540 | MAP_PRIVATE|MAP_EXECUTABLE, 0); |
0b8c78f2 | 541 | if (!textpos || IS_ERR_VALUE(textpos)) { |
1ad3dcc0 | 542 | ret = textpos; |
13c3f50c NP |
543 | if (!textpos) |
544 | ret = -ENOMEM; | |
4adbb6ac | 545 | pr_err("Unable to mmap process text, errno %d\n", ret); |
df88912a | 546 | goto err; |
1da177e4 LT |
547 | } |
548 | ||
72613e5f | 549 | len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); |
0f3e442a | 550 | len = PAGE_ALIGN(len); |
13c3f50c | 551 | realdatastart = vm_mmap(NULL, 0, len, |
72613e5f | 552 | PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); |
1da177e4 | 553 | |
0b8c78f2 | 554 | if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) { |
13c3f50c | 555 | ret = realdatastart; |
1da177e4 | 556 | if (!realdatastart) |
13c3f50c | 557 | ret = -ENOMEM; |
4adbb6ac | 558 | pr_err("Unable to allocate RAM for process data, " |
13c3f50c | 559 | "errno %d\n", ret); |
7696e0c3 | 560 | vm_munmap(textpos, text_len); |
df88912a | 561 | goto err; |
1da177e4 | 562 | } |
c3dc5bec OS |
563 | datapos = ALIGN(realdatastart + |
564 | MAX_SHARED_LIBS * sizeof(unsigned long), | |
565 | FLAT_DATA_ALIGN); | |
1da177e4 | 566 | |
a8605423 | 567 | pr_debug("Allocated data+bss+stack (%u bytes): %lx\n", |
4adbb6ac | 568 | data_len + bss_len + stack_len, datapos); |
1da177e4 LT |
569 | |
570 | fpos = ntohl(hdr->data_start); | |
571 | #ifdef CONFIG_BINFMT_ZFLAT | |
572 | if (flags & FLAT_FLAG_GZDATA) { | |
13c3f50c | 573 | result = decompress_exec(bprm, fpos, (char *)datapos, |
3dc20cb2 | 574 | full_data, 0); |
1da177e4 LT |
575 | } else |
576 | #endif | |
577 | { | |
3dc20cb2 AV |
578 | result = read_code(bprm->file, datapos, fpos, |
579 | full_data); | |
1da177e4 | 580 | } |
0b8c78f2 | 581 | if (IS_ERR_VALUE(result)) { |
13c3f50c | 582 | ret = result; |
4adbb6ac | 583 | pr_err("Unable to read data+bss, errno %d\n", ret); |
7696e0c3 AV |
584 | vm_munmap(textpos, text_len); |
585 | vm_munmap(realdatastart, len); | |
df88912a | 586 | goto err; |
1da177e4 LT |
587 | } |
588 | ||
468138d7 | 589 | reloc = (u32 __user *) |
13c3f50c | 590 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
1da177e4 | 591 | memp = realdatastart; |
0f3e442a | 592 | memp_size = len; |
1da177e4 LT |
593 | } else { |
594 | ||
468138d7 | 595 | len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(u32); |
0f3e442a | 596 | len = PAGE_ALIGN(len); |
13c3f50c | 597 | textpos = vm_mmap(NULL, 0, len, |
72613e5f | 598 | PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); |
72613e5f | 599 | |
0b8c78f2 | 600 | if (!textpos || IS_ERR_VALUE(textpos)) { |
1ad3dcc0 | 601 | ret = textpos; |
13c3f50c NP |
602 | if (!textpos) |
603 | ret = -ENOMEM; | |
4adbb6ac | 604 | pr_err("Unable to allocate RAM for process text/data, " |
13c3f50c | 605 | "errno %d\n", ret); |
df88912a | 606 | goto err; |
1da177e4 LT |
607 | } |
608 | ||
609 | realdatastart = textpos + ntohl(hdr->data_start); | |
c3dc5bec | 610 | datapos = ALIGN(realdatastart + |
468138d7 | 611 | MAX_SHARED_LIBS * sizeof(u32), |
c3dc5bec OS |
612 | FLAT_DATA_ALIGN); |
613 | ||
468138d7 | 614 | reloc = (u32 __user *) |
c3dc5bec | 615 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
1da177e4 | 616 | memp = textpos; |
0f3e442a | 617 | memp_size = len; |
1da177e4 LT |
618 | #ifdef CONFIG_BINFMT_ZFLAT |
619 | /* | |
620 | * load it all in and treat it like a RAM load from now on | |
621 | */ | |
622 | if (flags & FLAT_FLAG_GZIP) { | |
472f95f3 | 623 | #ifndef CONFIG_MMU |
13c3f50c NP |
624 | result = decompress_exec(bprm, sizeof(struct flat_hdr), |
625 | (((char *)textpos) + sizeof(struct flat_hdr)), | |
3dc20cb2 | 626 | (text_len + full_data |
13c3f50c | 627 | - sizeof(struct flat_hdr)), |
1da177e4 LT |
628 | 0); |
629 | memmove((void *) datapos, (void *) realdatastart, | |
3dc20cb2 | 630 | full_data); |
472f95f3 NP |
631 | #else |
632 | /* | |
633 | * This is used on MMU systems mainly for testing. | |
634 | * Let's use a kernel buffer to simplify things. | |
635 | */ | |
636 | long unz_text_len = text_len - sizeof(struct flat_hdr); | |
637 | long unz_len = unz_text_len + full_data; | |
638 | char *unz_data = vmalloc(unz_len); | |
639 | if (!unz_data) { | |
640 | result = -ENOMEM; | |
641 | } else { | |
642 | result = decompress_exec(bprm, sizeof(struct flat_hdr), | |
643 | unz_data, unz_len, 0); | |
644 | if (result == 0 && | |
645 | (copy_to_user((void __user *)textpos + sizeof(struct flat_hdr), | |
646 | unz_data, unz_text_len) || | |
647 | copy_to_user((void __user *)datapos, | |
648 | unz_data + unz_text_len, full_data))) | |
649 | result = -EFAULT; | |
650 | vfree(unz_data); | |
651 | } | |
652 | #endif | |
1da177e4 | 653 | } else if (flags & FLAT_FLAG_GZDATA) { |
3dc20cb2 | 654 | result = read_code(bprm->file, textpos, 0, text_len); |
472f95f3 NP |
655 | if (!IS_ERR_VALUE(result)) { |
656 | #ifndef CONFIG_MMU | |
1da177e4 | 657 | result = decompress_exec(bprm, text_len, (char *) datapos, |
3dc20cb2 | 658 | full_data, 0); |
472f95f3 NP |
659 | #else |
660 | char *unz_data = vmalloc(full_data); | |
661 | if (!unz_data) { | |
662 | result = -ENOMEM; | |
663 | } else { | |
664 | result = decompress_exec(bprm, text_len, | |
665 | unz_data, full_data, 0); | |
666 | if (result == 0 && | |
667 | copy_to_user((void __user *)datapos, | |
668 | unz_data, full_data)) | |
669 | result = -EFAULT; | |
670 | vfree(unz_data); | |
671 | } | |
1da177e4 | 672 | #endif |
472f95f3 NP |
673 | } |
674 | } else | |
675 | #endif /* CONFIG_BINFMT_ZFLAT */ | |
1da177e4 | 676 | { |
3dc20cb2 AV |
677 | result = read_code(bprm->file, textpos, 0, text_len); |
678 | if (!IS_ERR_VALUE(result)) | |
679 | result = read_code(bprm->file, datapos, | |
680 | ntohl(hdr->data_start), | |
681 | full_data); | |
1da177e4 | 682 | } |
0b8c78f2 | 683 | if (IS_ERR_VALUE(result)) { |
13c3f50c | 684 | ret = result; |
4adbb6ac | 685 | pr_err("Unable to read code+data+bss, errno %d\n", ret); |
7696e0c3 | 686 | vm_munmap(textpos, text_len + data_len + extra + |
468138d7 | 687 | MAX_SHARED_LIBS * sizeof(u32)); |
df88912a | 688 | goto err; |
1da177e4 LT |
689 | } |
690 | } | |
691 | ||
13c3f50c NP |
692 | start_code = textpos + sizeof(struct flat_hdr); |
693 | end_code = textpos + text_len; | |
694 | text_len -= sizeof(struct flat_hdr); /* the real code len */ | |
1da177e4 LT |
695 | |
696 | /* The main program needs a little extra setup in the task structure */ | |
1da177e4 LT |
697 | if (id == 0) { |
698 | current->mm->start_code = start_code; | |
699 | current->mm->end_code = end_code; | |
700 | current->mm->start_data = datapos; | |
701 | current->mm->end_data = datapos + data_len; | |
702 | /* | |
703 | * set up the brk stuff, uses any slack left in data/bss/stack | |
704 | * allocation. We put the brk after the bss (between the bss | |
705 | * and stack) like other platforms. | |
0f3e442a DH |
706 | * Userspace code relies on the stack pointer starting out at |
707 | * an address right at the end of a page. | |
1da177e4 LT |
708 | */ |
709 | current->mm->start_brk = datapos + data_len + bss_len; | |
710 | current->mm->brk = (current->mm->start_brk + 3) & ~3; | |
015feacf | 711 | #ifndef CONFIG_MMU |
0f3e442a | 712 | current->mm->context.end_brk = memp + memp_size - stack_len; |
015feacf | 713 | #endif |
1da177e4 LT |
714 | } |
715 | ||
13c3f50c | 716 | if (flags & FLAT_FLAG_KTRACE) { |
4adbb6ac NP |
717 | pr_info("Mapping is %lx, Entry point is %x, data_start is %x\n", |
718 | textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); | |
719 | pr_info("%s %s: TEXT=%lx-%lx DATA=%lx-%lx BSS=%lx-%lx\n", | |
720 | id ? "Lib" : "Load", bprm->filename, | |
721 | start_code, end_code, datapos, datapos + data_len, | |
722 | datapos + data_len, (datapos + data_len + bss_len + 3) & ~3); | |
13c3f50c | 723 | } |
1da177e4 LT |
724 | |
725 | /* Store the current module values into the global library structure */ | |
726 | libinfo->lib_list[id].start_code = start_code; | |
727 | libinfo->lib_list[id].start_data = datapos; | |
728 | libinfo->lib_list[id].start_brk = datapos + data_len + bss_len; | |
729 | libinfo->lib_list[id].text_len = text_len; | |
730 | libinfo->lib_list[id].loaded = 1; | |
731 | libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; | |
732 | libinfo->lib_list[id].build_date = ntohl(hdr->build_date); | |
13c3f50c | 733 | |
1da177e4 LT |
734 | /* |
735 | * We just load the allocations into some temporary memory to | |
736 | * help simplify all this mumbo jumbo | |
737 | * | |
738 | * We've got two different sections of relocation entries. | |
25985edc | 739 | * The first is the GOT which resides at the beginning of the data segment |
1da177e4 LT |
740 | * and is terminated with a -1. This one can be relocated in place. |
741 | * The second is the extra relocation entries tacked after the image's | |
742 | * data segment. These require a little more processing as the entry is | |
743 | * really an offset into the image which contains an offset into the | |
744 | * image. | |
745 | */ | |
746 | if (flags & FLAT_FLAG_GOTPIC) { | |
468138d7 AV |
747 | for (rp = (u32 __user *)datapos; ; rp++) { |
748 | u32 addr, rp_val; | |
6e572ffe NP |
749 | if (get_user(rp_val, rp)) |
750 | return -EFAULT; | |
751 | if (rp_val == 0xffffffff) | |
752 | break; | |
753 | if (rp_val) { | |
754 | addr = calc_reloc(rp_val, libinfo, id, 0); | |
1ad3dcc0 LY |
755 | if (addr == RELOC_FAILED) { |
756 | ret = -ENOEXEC; | |
df88912a | 757 | goto err; |
1ad3dcc0 | 758 | } |
6e572ffe NP |
759 | if (put_user(addr, rp)) |
760 | return -EFAULT; | |
1da177e4 LT |
761 | } |
762 | } | |
763 | } | |
764 | ||
765 | /* | |
766 | * Now run through the relocation entries. | |
767 | * We've got to be careful here as C++ produces relocatable zero | |
768 | * entries in the constructor and destructor tables which are then | |
769 | * tested for being not zero (which will always occur unless we're | |
770 | * based from address zero). This causes an endless loop as __start | |
771 | * is at zero. The solution used is to not relocate zero addresses. | |
772 | * This has the negative side effect of not allowing a global data | |
773 | * reference to be statically initialised to _stext (I've moved | |
774 | * __start to address 4 so that is okay). | |
775 | */ | |
776 | if (rev > OLD_FLAT_VERSION) { | |
468138d7 | 777 | u32 __maybe_unused persistent = 0; |
13c3f50c | 778 | for (i = 0; i < relocs; i++) { |
468138d7 | 779 | u32 addr, relval; |
1da177e4 | 780 | |
13c3f50c NP |
781 | /* |
782 | * Get the address of the pointer to be | |
783 | * relocated (of course, the address has to be | |
784 | * relocated first). | |
785 | */ | |
6e572ffe NP |
786 | if (get_user(relval, reloc + i)) |
787 | return -EFAULT; | |
788 | relval = ntohl(relval); | |
13c3f50c | 789 | if (flat_set_persistent(relval, &persistent)) |
f9720205 | 790 | continue; |
1da177e4 | 791 | addr = flat_get_relocate_addr(relval); |
468138d7 AV |
792 | rp = (u32 __user *)calc_reloc(addr, libinfo, id, 1); |
793 | if (rp == (u32 __user *)RELOC_FAILED) { | |
1ad3dcc0 | 794 | ret = -ENOEXEC; |
df88912a | 795 | goto err; |
1ad3dcc0 | 796 | } |
1da177e4 LT |
797 | |
798 | /* Get the pointer's value. */ | |
468138d7 AV |
799 | ret = flat_get_addr_from_rp(rp, relval, flags, |
800 | &addr, &persistent); | |
801 | if (unlikely(ret)) | |
802 | goto err; | |
803 | ||
1da177e4 LT |
804 | if (addr != 0) { |
805 | /* | |
806 | * Do the relocation. PIC relocs in the data section are | |
807 | * already in target order | |
808 | */ | |
809 | if ((flags & FLAT_FLAG_GOTPIC) == 0) | |
810 | addr = ntohl(addr); | |
811 | addr = calc_reloc(addr, libinfo, id, 0); | |
1ad3dcc0 LY |
812 | if (addr == RELOC_FAILED) { |
813 | ret = -ENOEXEC; | |
df88912a | 814 | goto err; |
1ad3dcc0 | 815 | } |
1da177e4 LT |
816 | |
817 | /* Write back the relocated pointer. */ | |
468138d7 AV |
818 | ret = flat_put_addr_at_rp(rp, addr, relval); |
819 | if (unlikely(ret)) | |
820 | goto err; | |
1da177e4 LT |
821 | } |
822 | } | |
823 | } else { | |
1b2ce442 | 824 | for (i = 0; i < relocs; i++) { |
468138d7 | 825 | u32 relval; |
1b2ce442 NP |
826 | if (get_user(relval, reloc + i)) |
827 | return -EFAULT; | |
828 | relval = ntohl(relval); | |
829 | old_reloc(relval); | |
830 | } | |
1da177e4 | 831 | } |
13c3f50c | 832 | |
1da177e4 LT |
833 | flush_icache_range(start_code, end_code); |
834 | ||
835 | /* zero the BSS, BRK and stack areas */ | |
467aa146 NP |
836 | if (clear_user((void __user *)(datapos + data_len), bss_len + |
837 | (memp + memp_size - stack_len - /* end brk */ | |
838 | libinfo->lib_list[id].start_brk) + /* start brk */ | |
839 | stack_len)) | |
840 | return -EFAULT; | |
1da177e4 LT |
841 | |
842 | return 0; | |
1ad3dcc0 LY |
843 | err: |
844 | return ret; | |
1da177e4 LT |
845 | } |
846 | ||
847 | ||
848 | /****************************************************************************/ | |
849 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
850 | ||
851 | /* | |
852 | * Load a shared library into memory. The library gets its own data | |
853 | * segment (including bss) but not argv/argc/environ. | |
854 | */ | |
855 | ||
856 | static int load_flat_shared_library(int id, struct lib_info *libs) | |
857 | { | |
858 | struct linux_binprm bprm; | |
859 | int res; | |
860 | char buf[16]; | |
861 | ||
3a852d3b DH |
862 | memset(&bprm, 0, sizeof(bprm)); |
863 | ||
1da177e4 LT |
864 | /* Create the file name */ |
865 | sprintf(buf, "/lib/lib%d.so", id); | |
866 | ||
867 | /* Open the file up */ | |
868 | bprm.filename = buf; | |
869 | bprm.file = open_exec(bprm.filename); | |
870 | res = PTR_ERR(bprm.file); | |
871 | if (IS_ERR(bprm.file)) | |
872 | return res; | |
873 | ||
3440625d LT |
874 | bprm.cred = prepare_exec_creds(); |
875 | res = -ENOMEM; | |
876 | if (!bprm.cred) | |
877 | goto out; | |
878 | ||
3a852d3b DH |
879 | /* We don't really care about recalculating credentials at this point |
880 | * as we're past the point of no return and are dealing with shared | |
881 | * libraries. | |
882 | */ | |
ddb4a144 | 883 | bprm.called_set_creds = 1; |
3a852d3b | 884 | |
1da177e4 LT |
885 | res = prepare_binprm(&bprm); |
886 | ||
287980e4 | 887 | if (!res) |
1da177e4 | 888 | res = load_flat_file(&bprm, libs, id, NULL); |
3440625d LT |
889 | |
890 | abort_creds(bprm.cred); | |
891 | ||
892 | out: | |
893 | allow_write_access(bprm.file); | |
894 | fput(bprm.file); | |
895 | ||
13c3f50c | 896 | return res; |
1da177e4 LT |
897 | } |
898 | ||
899 | #endif /* CONFIG_BINFMT_SHARED_FLAT */ | |
900 | /****************************************************************************/ | |
901 | ||
902 | /* | |
903 | * These are the functions used to load flat style executables and shared | |
904 | * libraries. There is no binary dependent code anywhere else. | |
905 | */ | |
906 | ||
13c3f50c | 907 | static int load_flat_binary(struct linux_binprm *bprm) |
1da177e4 LT |
908 | { |
909 | struct lib_info libinfo; | |
71613c3b | 910 | struct pt_regs *regs = current_pt_regs(); |
015feacf | 911 | unsigned long stack_len = 0; |
1da177e4 | 912 | unsigned long start_addr; |
1da177e4 LT |
913 | int res; |
914 | int i, j; | |
915 | ||
916 | memset(&libinfo, 0, sizeof(libinfo)); | |
13c3f50c | 917 | |
1da177e4 LT |
918 | /* |
919 | * We have to add the size of our arguments to our stack size | |
920 | * otherwise it's too easy for users to create stack overflows | |
921 | * by passing in a huge argument list. And yes, we have to be | |
922 | * pedantic and include space for the argv/envp array as it may have | |
923 | * a lot of entries. | |
924 | */ | |
015feacf NP |
925 | #ifndef CONFIG_MMU |
926 | stack_len += PAGE_SIZE * MAX_ARG_PAGES - bprm->p; /* the strings */ | |
927 | #endif | |
a97d157d NP |
928 | stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */ |
929 | stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */ | |
930 | stack_len = ALIGN(stack_len, FLAT_STACK_ALIGN); | |
13c3f50c | 931 | |
1da177e4 | 932 | res = load_flat_file(bprm, &libinfo, 0, &stack_len); |
287980e4 | 933 | if (res < 0) |
1da177e4 | 934 | return res; |
13c3f50c | 935 | |
1da177e4 | 936 | /* Update data segment pointers for all libraries */ |
af521f92 NP |
937 | for (i = 0; i < MAX_SHARED_LIBS; i++) { |
938 | if (!libinfo.lib_list[i].loaded) | |
939 | continue; | |
940 | for (j = 0; j < MAX_SHARED_LIBS; j++) { | |
941 | unsigned long val = libinfo.lib_list[j].loaded ? | |
942 | libinfo.lib_list[j].start_data : UNLOADED_LIB; | |
943 | unsigned long __user *p = (unsigned long __user *) | |
944 | libinfo.lib_list[i].start_data; | |
945 | p -= j + 1; | |
946 | if (put_user(val, p)) | |
947 | return -EFAULT; | |
948 | } | |
949 | } | |
1da177e4 | 950 | |
a6f76f23 | 951 | install_exec_creds(bprm); |
1da177e4 LT |
952 | |
953 | set_binfmt(&flat_format); | |
954 | ||
015feacf NP |
955 | #ifdef CONFIG_MMU |
956 | res = setup_arg_pages(bprm, STACK_TOP, EXSTACK_DEFAULT); | |
957 | if (!res) | |
958 | res = create_flat_tables(bprm, bprm->p); | |
959 | #else | |
a97d157d NP |
960 | /* Stash our initial stack pointer into the mm structure */ |
961 | current->mm->start_stack = | |
962 | ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; | |
963 | pr_debug("sp=%lx\n", current->mm->start_stack); | |
1da177e4 | 964 | |
687fd773 | 965 | /* copy the arg pages onto the stack */ |
a97d157d NP |
966 | res = transfer_args_to_stack(bprm, ¤t->mm->start_stack); |
967 | if (!res) | |
968 | res = create_flat_tables(bprm, current->mm->start_stack); | |
015feacf | 969 | #endif |
687fd773 NP |
970 | if (res) |
971 | return res; | |
1da177e4 | 972 | |
1da177e4 LT |
973 | /* Fake some return addresses to ensure the call chain will |
974 | * initialise library in order for us. We are required to call | |
975 | * lib 1 first, then 2, ... and finally the main program (id 0). | |
976 | */ | |
977 | start_addr = libinfo.lib_list[0].entry; | |
978 | ||
979 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
13c3f50c | 980 | for (i = MAX_SHARED_LIBS-1; i > 0; i--) { |
1da177e4 LT |
981 | if (libinfo.lib_list[i].loaded) { |
982 | /* Push previos first to call address */ | |
a97d157d NP |
983 | unsigned long __user *sp; |
984 | current->mm->start_stack -= sizeof(unsigned long); | |
985 | sp = (unsigned long __user *)current->mm->start_stack; | |
986 | __put_user(start_addr, sp); | |
1da177e4 LT |
987 | start_addr = libinfo.lib_list[i].entry; |
988 | } | |
989 | } | |
990 | #endif | |
13c3f50c | 991 | |
74c27c43 TY |
992 | #ifdef FLAT_PLAT_INIT |
993 | FLAT_PLAT_INIT(regs); | |
994 | #endif | |
13c3f50c | 995 | |
4adbb6ac NP |
996 | pr_debug("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n", |
997 | regs, start_addr, current->mm->start_stack); | |
1da177e4 LT |
998 | start_thread(regs, start_addr, current->mm->start_stack); |
999 | ||
1da177e4 LT |
1000 | return 0; |
1001 | } | |
1002 | ||
1003 | /****************************************************************************/ | |
1004 | ||
1005 | static int __init init_flat_binfmt(void) | |
1006 | { | |
8fc3dc5a AV |
1007 | register_binfmt(&flat_format); |
1008 | return 0; | |
1da177e4 | 1009 | } |
1da177e4 | 1010 | core_initcall(init_flat_binfmt); |
1da177e4 LT |
1011 | |
1012 | /****************************************************************************/ |