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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 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/config.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/mm.h> | |
23 | #include <linux/mman.h> | |
24 | #include <linux/a.out.h> | |
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> | |
30 | #include <linux/stat.h> | |
31 | #include <linux/fcntl.h> | |
32 | #include <linux/ptrace.h> | |
33 | #include <linux/user.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/binfmts.h> | |
36 | #include <linux/personality.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/flat.h> | |
1ad3dcc0 | 39 | #include <linux/syscalls.h> |
1da177e4 LT |
40 | |
41 | #include <asm/byteorder.h> | |
42 | #include <asm/system.h> | |
43 | #include <asm/uaccess.h> | |
44 | #include <asm/unaligned.h> | |
45 | #include <asm/cacheflush.h> | |
46 | ||
47 | /****************************************************************************/ | |
48 | ||
49 | #if 0 | |
50 | #define DEBUG 1 | |
51 | #endif | |
52 | ||
53 | #ifdef DEBUG | |
54 | #define DBG_FLT(a...) printk(a) | |
55 | #else | |
56 | #define DBG_FLT(a...) | |
57 | #endif | |
58 | ||
59 | #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ | |
60 | #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ | |
61 | ||
62 | struct lib_info { | |
63 | struct { | |
64 | unsigned long start_code; /* Start of text segment */ | |
65 | unsigned long start_data; /* Start of data segment */ | |
66 | unsigned long start_brk; /* End of data segment */ | |
67 | unsigned long text_len; /* Length of text segment */ | |
68 | unsigned long entry; /* Start address for this module */ | |
69 | unsigned long build_date; /* When this one was compiled */ | |
70 | short loaded; /* Has this library been loaded? */ | |
71 | } lib_list[MAX_SHARED_LIBS]; | |
72 | }; | |
73 | ||
74 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
75 | static int load_flat_shared_library(int id, struct lib_info *p); | |
76 | #endif | |
77 | ||
78 | static int load_flat_binary(struct linux_binprm *, struct pt_regs * regs); | |
79 | static int flat_core_dump(long signr, struct pt_regs * regs, struct file *file); | |
80 | ||
1da177e4 LT |
81 | static struct linux_binfmt flat_format = { |
82 | .module = THIS_MODULE, | |
83 | .load_binary = load_flat_binary, | |
84 | .core_dump = flat_core_dump, | |
85 | .min_coredump = PAGE_SIZE | |
86 | }; | |
87 | ||
88 | /****************************************************************************/ | |
89 | /* | |
90 | * Routine writes a core dump image in the current directory. | |
91 | * Currently only a stub-function. | |
92 | */ | |
93 | ||
94 | static int flat_core_dump(long signr, struct pt_regs * regs, struct file *file) | |
95 | { | |
96 | printk("Process %s:%d received signr %d and should have core dumped\n", | |
97 | current->comm, current->pid, (int) signr); | |
98 | return(1); | |
99 | } | |
100 | ||
101 | /****************************************************************************/ | |
102 | /* | |
103 | * create_flat_tables() parses the env- and arg-strings in new user | |
104 | * memory and creates the pointer tables from them, and puts their | |
105 | * addresses on the "stack", returning the new stack pointer value. | |
106 | */ | |
107 | ||
108 | static unsigned long create_flat_tables( | |
109 | unsigned long pp, | |
110 | struct linux_binprm * bprm) | |
111 | { | |
112 | unsigned long *argv,*envp; | |
113 | unsigned long * sp; | |
114 | char * p = (char*)pp; | |
115 | int argc = bprm->argc; | |
116 | int envc = bprm->envc; | |
117 | char dummy; | |
118 | ||
119 | sp = (unsigned long *) ((-(unsigned long)sizeof(char *))&(unsigned long) p); | |
120 | ||
121 | sp -= envc+1; | |
122 | envp = sp; | |
123 | sp -= argc+1; | |
124 | argv = sp; | |
125 | ||
126 | flat_stack_align(sp); | |
127 | if (flat_argvp_envp_on_stack()) { | |
128 | --sp; put_user((unsigned long) envp, sp); | |
129 | --sp; put_user((unsigned long) argv, sp); | |
130 | } | |
131 | ||
132 | put_user(argc,--sp); | |
133 | current->mm->arg_start = (unsigned long) p; | |
134 | while (argc-->0) { | |
135 | put_user((unsigned long) p, argv++); | |
136 | do { | |
137 | get_user(dummy, p); p++; | |
138 | } while (dummy); | |
139 | } | |
140 | put_user((unsigned long) NULL, argv); | |
141 | current->mm->arg_end = current->mm->env_start = (unsigned long) p; | |
142 | while (envc-->0) { | |
143 | put_user((unsigned long)p, envp); envp++; | |
144 | do { | |
145 | get_user(dummy, p); p++; | |
146 | } while (dummy); | |
147 | } | |
148 | put_user((unsigned long) NULL, envp); | |
149 | current->mm->env_end = (unsigned long) p; | |
150 | return (unsigned long)sp; | |
151 | } | |
152 | ||
153 | /****************************************************************************/ | |
154 | ||
155 | #ifdef CONFIG_BINFMT_ZFLAT | |
156 | ||
157 | #include <linux/zlib.h> | |
158 | ||
159 | #define LBUFSIZE 4000 | |
160 | ||
161 | /* gzip flag byte */ | |
162 | #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ | |
163 | #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ | |
164 | #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ | |
165 | #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ | |
166 | #define COMMENT 0x10 /* bit 4 set: file comment present */ | |
167 | #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ | |
168 | #define RESERVED 0xC0 /* bit 6,7: reserved */ | |
169 | ||
170 | static int decompress_exec( | |
171 | struct linux_binprm *bprm, | |
172 | unsigned long offset, | |
173 | char *dst, | |
174 | long len, | |
175 | int fd) | |
176 | { | |
177 | unsigned char *buf; | |
178 | z_stream strm; | |
179 | loff_t fpos; | |
180 | int ret, retval; | |
181 | ||
182 | DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len); | |
183 | ||
184 | memset(&strm, 0, sizeof(strm)); | |
185 | strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); | |
186 | if (strm.workspace == NULL) { | |
187 | DBG_FLT("binfmt_flat: no memory for decompress workspace\n"); | |
188 | return -ENOMEM; | |
189 | } | |
190 | buf = kmalloc(LBUFSIZE, GFP_KERNEL); | |
191 | if (buf == NULL) { | |
192 | DBG_FLT("binfmt_flat: no memory for read buffer\n"); | |
193 | retval = -ENOMEM; | |
194 | goto out_free; | |
195 | } | |
196 | ||
197 | /* Read in first chunk of data and parse gzip header. */ | |
198 | fpos = offset; | |
199 | ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); | |
200 | ||
201 | strm.next_in = buf; | |
202 | strm.avail_in = ret; | |
203 | strm.total_in = 0; | |
204 | ||
205 | retval = -ENOEXEC; | |
206 | ||
207 | /* Check minimum size -- gzip header */ | |
208 | if (ret < 10) { | |
209 | DBG_FLT("binfmt_flat: file too small?\n"); | |
210 | goto out_free_buf; | |
211 | } | |
212 | ||
213 | /* Check gzip magic number */ | |
214 | if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { | |
215 | DBG_FLT("binfmt_flat: unknown compression magic?\n"); | |
216 | goto out_free_buf; | |
217 | } | |
218 | ||
219 | /* Check gzip method */ | |
220 | if (buf[2] != 8) { | |
221 | DBG_FLT("binfmt_flat: unknown compression method?\n"); | |
222 | goto out_free_buf; | |
223 | } | |
224 | /* Check gzip flags */ | |
225 | if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || | |
226 | (buf[3] & RESERVED)) { | |
227 | DBG_FLT("binfmt_flat: unknown flags?\n"); | |
228 | goto out_free_buf; | |
229 | } | |
230 | ||
231 | ret = 10; | |
232 | if (buf[3] & EXTRA_FIELD) { | |
233 | ret += 2 + buf[10] + (buf[11] << 8); | |
234 | if (unlikely(LBUFSIZE == ret)) { | |
235 | DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n"); | |
236 | goto out_free_buf; | |
237 | } | |
238 | } | |
239 | if (buf[3] & ORIG_NAME) { | |
240 | for (; ret < LBUFSIZE && (buf[ret] != 0); ret++) | |
241 | ; | |
242 | if (unlikely(LBUFSIZE == ret)) { | |
243 | DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n"); | |
244 | goto out_free_buf; | |
245 | } | |
246 | } | |
247 | if (buf[3] & COMMENT) { | |
248 | for (; ret < LBUFSIZE && (buf[ret] != 0); ret++) | |
249 | ; | |
250 | if (unlikely(LBUFSIZE == ret)) { | |
251 | DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n"); | |
252 | goto out_free_buf; | |
253 | } | |
254 | } | |
255 | ||
256 | strm.next_in += ret; | |
257 | strm.avail_in -= ret; | |
258 | ||
259 | strm.next_out = dst; | |
260 | strm.avail_out = len; | |
261 | strm.total_out = 0; | |
262 | ||
263 | if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) { | |
264 | DBG_FLT("binfmt_flat: zlib init failed?\n"); | |
265 | goto out_free_buf; | |
266 | } | |
267 | ||
268 | while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { | |
269 | ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); | |
270 | if (ret <= 0) | |
271 | break; | |
272 | if (ret >= (unsigned long) -4096) | |
273 | break; | |
274 | len -= ret; | |
275 | ||
276 | strm.next_in = buf; | |
277 | strm.avail_in = ret; | |
278 | strm.total_in = 0; | |
279 | } | |
280 | ||
281 | if (ret < 0) { | |
282 | DBG_FLT("binfmt_flat: decompression failed (%d), %s\n", | |
283 | ret, strm.msg); | |
284 | goto out_zlib; | |
285 | } | |
286 | ||
287 | retval = 0; | |
288 | out_zlib: | |
289 | zlib_inflateEnd(&strm); | |
290 | out_free_buf: | |
291 | kfree(buf); | |
292 | out_free: | |
293 | kfree(strm.workspace); | |
294 | out: | |
295 | return retval; | |
296 | } | |
297 | ||
298 | #endif /* CONFIG_BINFMT_ZFLAT */ | |
299 | ||
300 | /****************************************************************************/ | |
301 | ||
302 | static unsigned long | |
303 | calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp) | |
304 | { | |
305 | unsigned long addr; | |
306 | int id; | |
307 | unsigned long start_brk; | |
308 | unsigned long start_data; | |
309 | unsigned long text_len; | |
310 | unsigned long start_code; | |
311 | ||
312 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
313 | if (r == 0) | |
314 | id = curid; /* Relocs of 0 are always self referring */ | |
315 | else { | |
316 | id = (r >> 24) & 0xff; /* Find ID for this reloc */ | |
317 | r &= 0x00ffffff; /* Trim ID off here */ | |
318 | } | |
319 | if (id >= MAX_SHARED_LIBS) { | |
320 | printk("BINFMT_FLAT: reference 0x%x to shared library %d", | |
321 | (unsigned) r, id); | |
322 | goto failed; | |
323 | } | |
324 | if (curid != id) { | |
325 | if (internalp) { | |
326 | printk("BINFMT_FLAT: reloc address 0x%x not in same module " | |
327 | "(%d != %d)", (unsigned) r, curid, id); | |
328 | goto failed; | |
329 | } else if ( ! p->lib_list[id].loaded && | |
330 | load_flat_shared_library(id, p) > (unsigned long) -4096) { | |
331 | printk("BINFMT_FLAT: failed to load library %d", id); | |
332 | goto failed; | |
333 | } | |
334 | /* Check versioning information (i.e. time stamps) */ | |
335 | if (p->lib_list[id].build_date && p->lib_list[curid].build_date && | |
336 | p->lib_list[curid].build_date < p->lib_list[id].build_date) { | |
337 | printk("BINFMT_FLAT: library %d is younger than %d", id, curid); | |
338 | goto failed; | |
339 | } | |
340 | } | |
341 | #else | |
342 | id = 0; | |
343 | #endif | |
344 | ||
345 | start_brk = p->lib_list[id].start_brk; | |
346 | start_data = p->lib_list[id].start_data; | |
347 | start_code = p->lib_list[id].start_code; | |
348 | text_len = p->lib_list[id].text_len; | |
349 | ||
350 | if (!flat_reloc_valid(r, start_brk - start_data + text_len)) { | |
351 | printk("BINFMT_FLAT: reloc outside program 0x%x (0 - 0x%x/0x%x)", | |
352 | (int) r,(int)(start_brk-start_code),(int)text_len); | |
353 | goto failed; | |
354 | } | |
355 | ||
356 | if (r < text_len) /* In text segment */ | |
357 | addr = r + start_code; | |
358 | else /* In data segment */ | |
359 | addr = r - text_len + start_data; | |
360 | ||
361 | /* Range checked already above so doing the range tests is redundant...*/ | |
362 | return(addr); | |
363 | ||
364 | failed: | |
365 | printk(", killing %s!\n", current->comm); | |
366 | send_sig(SIGSEGV, current, 0); | |
367 | ||
368 | return RELOC_FAILED; | |
369 | } | |
370 | ||
371 | /****************************************************************************/ | |
372 | ||
373 | void old_reloc(unsigned long rl) | |
374 | { | |
375 | #ifdef DEBUG | |
376 | char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; | |
377 | #endif | |
378 | flat_v2_reloc_t r; | |
379 | unsigned long *ptr; | |
380 | ||
381 | r.value = rl; | |
382 | #if defined(CONFIG_COLDFIRE) | |
383 | ptr = (unsigned long *) (current->mm->start_code + r.reloc.offset); | |
384 | #else | |
385 | ptr = (unsigned long *) (current->mm->start_data + r.reloc.offset); | |
386 | #endif | |
387 | ||
388 | #ifdef DEBUG | |
389 | printk("Relocation of variable at DATASEG+%x " | |
390 | "(address %p, currently %x) into segment %s\n", | |
391 | r.reloc.offset, ptr, (int)*ptr, segment[r.reloc.type]); | |
392 | #endif | |
393 | ||
394 | switch (r.reloc.type) { | |
395 | case OLD_FLAT_RELOC_TYPE_TEXT: | |
396 | *ptr += current->mm->start_code; | |
397 | break; | |
398 | case OLD_FLAT_RELOC_TYPE_DATA: | |
399 | *ptr += current->mm->start_data; | |
400 | break; | |
401 | case OLD_FLAT_RELOC_TYPE_BSS: | |
402 | *ptr += current->mm->end_data; | |
403 | break; | |
404 | default: | |
405 | printk("BINFMT_FLAT: Unknown relocation type=%x\n", r.reloc.type); | |
406 | break; | |
407 | } | |
408 | ||
409 | #ifdef DEBUG | |
410 | printk("Relocation became %x\n", (int)*ptr); | |
411 | #endif | |
412 | } | |
413 | ||
414 | /****************************************************************************/ | |
415 | ||
416 | static int load_flat_file(struct linux_binprm * bprm, | |
417 | struct lib_info *libinfo, int id, unsigned long *extra_stack) | |
418 | { | |
419 | struct flat_hdr * hdr; | |
420 | unsigned long textpos = 0, datapos = 0, result; | |
421 | unsigned long realdatastart = 0; | |
422 | unsigned long text_len, data_len, bss_len, stack_len, flags; | |
423 | unsigned long memp = 0; /* for finding the brk area */ | |
424 | unsigned long extra, rlim; | |
425 | unsigned long *reloc = 0, *rp; | |
426 | struct inode *inode; | |
427 | int i, rev, relocs = 0; | |
428 | loff_t fpos; | |
429 | unsigned long start_code, end_code; | |
1ad3dcc0 LY |
430 | int ret; |
431 | int exec_fileno; | |
1da177e4 LT |
432 | |
433 | hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ | |
434 | inode = bprm->file->f_dentry->d_inode; | |
435 | ||
436 | text_len = ntohl(hdr->data_start); | |
437 | data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); | |
438 | bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); | |
439 | stack_len = ntohl(hdr->stack_size); | |
440 | if (extra_stack) { | |
441 | stack_len += *extra_stack; | |
442 | *extra_stack = stack_len; | |
443 | } | |
444 | relocs = ntohl(hdr->reloc_count); | |
445 | flags = ntohl(hdr->flags); | |
446 | rev = ntohl(hdr->rev); | |
447 | ||
845884d3 | 448 | if (strncmp(hdr->magic, "bFLT", 4)) { |
1da177e4 LT |
449 | /* |
450 | * because a lot of people do not manage to produce good | |
451 | * flat binaries, we leave this printk to help them realise | |
452 | * the problem. We only print the error if its not a script file | |
453 | */ | |
454 | if (strncmp(hdr->magic, "#!", 2)) | |
845884d3 | 455 | printk("BINFMT_FLAT: bad header magic\n"); |
1ad3dcc0 LY |
456 | ret = -ENOEXEC; |
457 | goto err; | |
845884d3 GU |
458 | } |
459 | ||
460 | if (flags & FLAT_FLAG_KTRACE) | |
461 | printk("BINFMT_FLAT: Loading file: %s\n", bprm->filename); | |
462 | ||
463 | if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) { | |
464 | printk("BINFMT_FLAT: bad flat file version 0x%x (supported 0x%x and 0x%x)\n", rev, FLAT_VERSION, OLD_FLAT_VERSION); | |
1ad3dcc0 LY |
465 | ret = -ENOEXEC; |
466 | goto err; | |
1da177e4 LT |
467 | } |
468 | ||
469 | /* Don't allow old format executables to use shared libraries */ | |
470 | if (rev == OLD_FLAT_VERSION && id != 0) { | |
471 | printk("BINFMT_FLAT: shared libraries are not available before rev 0x%x\n", | |
472 | (int) FLAT_VERSION); | |
1ad3dcc0 LY |
473 | ret = -ENOEXEC; |
474 | goto err; | |
1da177e4 LT |
475 | } |
476 | ||
477 | /* | |
478 | * fix up the flags for the older format, there were all kinds | |
479 | * of endian hacks, this only works for the simple cases | |
480 | */ | |
481 | if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags)) | |
482 | flags = FLAT_FLAG_RAM; | |
483 | ||
484 | #ifndef CONFIG_BINFMT_ZFLAT | |
485 | if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { | |
486 | printk("Support for ZFLAT executables is not enabled.\n"); | |
1ad3dcc0 LY |
487 | ret = -ENOEXEC; |
488 | goto err; | |
1da177e4 LT |
489 | } |
490 | #endif | |
491 | ||
492 | /* | |
493 | * Check initial limits. This avoids letting people circumvent | |
494 | * size limits imposed on them by creating programs with large | |
495 | * arrays in the data or bss. | |
496 | */ | |
497 | rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur; | |
498 | if (rlim >= RLIM_INFINITY) | |
499 | rlim = ~0; | |
1ad3dcc0 LY |
500 | if (data_len + bss_len > rlim) { |
501 | ret = -ENOMEM; | |
502 | goto err; | |
503 | } | |
504 | ||
505 | /* check file descriptor */ | |
506 | exec_fileno = get_unused_fd(); | |
507 | if (exec_fileno < 0) { | |
508 | ret = -EMFILE; | |
509 | goto err; | |
510 | } | |
511 | get_file(bprm->file); | |
512 | fd_install(exec_fileno, bprm->file); | |
1da177e4 LT |
513 | |
514 | /* Flush all traces of the currently running executable */ | |
515 | if (id == 0) { | |
516 | result = flush_old_exec(bprm); | |
1ad3dcc0 LY |
517 | if (result) { |
518 | ret = result; | |
519 | goto err_close; | |
520 | } | |
1da177e4 LT |
521 | |
522 | /* OK, This is the point of no return */ | |
523 | set_personality(PER_LINUX); | |
524 | } | |
525 | ||
526 | /* | |
527 | * calculate the extra space we need to map in | |
528 | */ | |
529 | extra = max(bss_len + stack_len, relocs * sizeof(unsigned long)); | |
530 | ||
531 | /* | |
532 | * there are a couple of cases here, the separate code/data | |
533 | * case, and then the fully copied to RAM case which lumps | |
534 | * it all together. | |
535 | */ | |
536 | if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) { | |
537 | /* | |
538 | * this should give us a ROM ptr, but if it doesn't we don't | |
539 | * really care | |
540 | */ | |
541 | DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n"); | |
542 | ||
543 | down_write(¤t->mm->mmap_sem); | |
213b24c9 | 544 | textpos = do_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, MAP_PRIVATE, 0); |
1da177e4 LT |
545 | up_write(¤t->mm->mmap_sem); |
546 | if (!textpos || textpos >= (unsigned long) -4096) { | |
547 | if (!textpos) | |
548 | textpos = (unsigned long) -ENOMEM; | |
549 | printk("Unable to mmap process text, errno %d\n", (int)-textpos); | |
1ad3dcc0 LY |
550 | ret = textpos; |
551 | goto err_close; | |
1da177e4 LT |
552 | } |
553 | ||
554 | down_write(¤t->mm->mmap_sem); | |
555 | realdatastart = do_mmap(0, 0, data_len + extra + | |
556 | MAX_SHARED_LIBS * sizeof(unsigned long), | |
8f5bb043 | 557 | PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); |
1da177e4 LT |
558 | up_write(¤t->mm->mmap_sem); |
559 | ||
560 | if (realdatastart == 0 || realdatastart >= (unsigned long)-4096) { | |
561 | if (!realdatastart) | |
562 | realdatastart = (unsigned long) -ENOMEM; | |
563 | printk("Unable to allocate RAM for process data, errno %d\n", | |
564 | (int)-datapos); | |
565 | do_munmap(current->mm, textpos, text_len); | |
1ad3dcc0 LY |
566 | ret = realdatastart; |
567 | goto err_close; | |
1da177e4 LT |
568 | } |
569 | datapos = realdatastart + MAX_SHARED_LIBS * sizeof(unsigned long); | |
570 | ||
571 | DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n", | |
572 | (int)(data_len + bss_len + stack_len), (int)datapos); | |
573 | ||
574 | fpos = ntohl(hdr->data_start); | |
575 | #ifdef CONFIG_BINFMT_ZFLAT | |
576 | if (flags & FLAT_FLAG_GZDATA) { | |
577 | result = decompress_exec(bprm, fpos, (char *) datapos, | |
578 | data_len + (relocs * sizeof(unsigned long)), 0); | |
579 | } else | |
580 | #endif | |
581 | { | |
582 | result = bprm->file->f_op->read(bprm->file, (char *) datapos, | |
583 | data_len + (relocs * sizeof(unsigned long)), &fpos); | |
584 | } | |
585 | if (result >= (unsigned long)-4096) { | |
586 | printk("Unable to read data+bss, errno %d\n", (int)-result); | |
587 | do_munmap(current->mm, textpos, text_len); | |
588 | do_munmap(current->mm, realdatastart, data_len + extra); | |
1ad3dcc0 LY |
589 | ret = result; |
590 | goto err_close; | |
1da177e4 LT |
591 | } |
592 | ||
593 | reloc = (unsigned long *) (datapos+(ntohl(hdr->reloc_start)-text_len)); | |
594 | memp = realdatastart; | |
595 | ||
596 | } else { | |
597 | ||
598 | down_write(¤t->mm->mmap_sem); | |
599 | textpos = do_mmap(0, 0, text_len + data_len + extra + | |
600 | MAX_SHARED_LIBS * sizeof(unsigned long), | |
8f5bb043 | 601 | PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); |
1da177e4 LT |
602 | up_write(¤t->mm->mmap_sem); |
603 | if (!textpos || textpos >= (unsigned long) -4096) { | |
604 | if (!textpos) | |
605 | textpos = (unsigned long) -ENOMEM; | |
606 | printk("Unable to allocate RAM for process text/data, errno %d\n", | |
607 | (int)-textpos); | |
1ad3dcc0 LY |
608 | ret = textpos; |
609 | goto err_close; | |
1da177e4 LT |
610 | } |
611 | ||
612 | realdatastart = textpos + ntohl(hdr->data_start); | |
613 | datapos = realdatastart + MAX_SHARED_LIBS * sizeof(unsigned long); | |
614 | reloc = (unsigned long *) (textpos + ntohl(hdr->reloc_start) + | |
615 | MAX_SHARED_LIBS * sizeof(unsigned long)); | |
616 | memp = textpos; | |
617 | ||
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) { | |
623 | result = decompress_exec(bprm, sizeof (struct flat_hdr), | |
624 | (((char *) textpos) + sizeof (struct flat_hdr)), | |
625 | (text_len + data_len + (relocs * sizeof(unsigned long)) | |
626 | - sizeof (struct flat_hdr)), | |
627 | 0); | |
628 | memmove((void *) datapos, (void *) realdatastart, | |
629 | data_len + (relocs * sizeof(unsigned long))); | |
630 | } else if (flags & FLAT_FLAG_GZDATA) { | |
631 | fpos = 0; | |
632 | result = bprm->file->f_op->read(bprm->file, | |
633 | (char *) textpos, text_len, &fpos); | |
634 | if (result < (unsigned long) -4096) | |
635 | result = decompress_exec(bprm, text_len, (char *) datapos, | |
636 | data_len + (relocs * sizeof(unsigned long)), 0); | |
637 | } | |
638 | else | |
639 | #endif | |
640 | { | |
641 | fpos = 0; | |
642 | result = bprm->file->f_op->read(bprm->file, | |
643 | (char *) textpos, text_len, &fpos); | |
644 | if (result < (unsigned long) -4096) { | |
645 | fpos = ntohl(hdr->data_start); | |
646 | result = bprm->file->f_op->read(bprm->file, (char *) datapos, | |
647 | data_len + (relocs * sizeof(unsigned long)), &fpos); | |
648 | } | |
649 | } | |
650 | if (result >= (unsigned long)-4096) { | |
651 | printk("Unable to read code+data+bss, errno %d\n",(int)-result); | |
652 | do_munmap(current->mm, textpos, text_len + data_len + extra + | |
653 | MAX_SHARED_LIBS * sizeof(unsigned long)); | |
1ad3dcc0 LY |
654 | ret = result; |
655 | goto err_close; | |
1da177e4 LT |
656 | } |
657 | } | |
658 | ||
659 | if (flags & FLAT_FLAG_KTRACE) | |
660 | printk("Mapping is %x, Entry point is %x, data_start is %x\n", | |
661 | (int)textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); | |
662 | ||
663 | /* The main program needs a little extra setup in the task structure */ | |
664 | start_code = textpos + sizeof (struct flat_hdr); | |
665 | end_code = textpos + text_len; | |
666 | if (id == 0) { | |
667 | current->mm->start_code = start_code; | |
668 | current->mm->end_code = end_code; | |
669 | current->mm->start_data = datapos; | |
670 | current->mm->end_data = datapos + data_len; | |
671 | /* | |
672 | * set up the brk stuff, uses any slack left in data/bss/stack | |
673 | * allocation. We put the brk after the bss (between the bss | |
674 | * and stack) like other platforms. | |
675 | */ | |
676 | current->mm->start_brk = datapos + data_len + bss_len; | |
677 | current->mm->brk = (current->mm->start_brk + 3) & ~3; | |
678 | current->mm->context.end_brk = memp + ksize((void *) memp) - stack_len; | |
1da177e4 LT |
679 | } |
680 | ||
681 | if (flags & FLAT_FLAG_KTRACE) | |
682 | printk("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n", | |
683 | id ? "Lib" : "Load", bprm->filename, | |
684 | (int) start_code, (int) end_code, | |
685 | (int) datapos, | |
686 | (int) (datapos + data_len), | |
687 | (int) (datapos + data_len), | |
688 | (int) (((datapos + data_len + bss_len) + 3) & ~3)); | |
689 | ||
690 | text_len -= sizeof(struct flat_hdr); /* the real code len */ | |
691 | ||
692 | /* Store the current module values into the global library structure */ | |
693 | libinfo->lib_list[id].start_code = start_code; | |
694 | libinfo->lib_list[id].start_data = datapos; | |
695 | libinfo->lib_list[id].start_brk = datapos + data_len + bss_len; | |
696 | libinfo->lib_list[id].text_len = text_len; | |
697 | libinfo->lib_list[id].loaded = 1; | |
698 | libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; | |
699 | libinfo->lib_list[id].build_date = ntohl(hdr->build_date); | |
700 | ||
701 | /* | |
702 | * We just load the allocations into some temporary memory to | |
703 | * help simplify all this mumbo jumbo | |
704 | * | |
705 | * We've got two different sections of relocation entries. | |
706 | * The first is the GOT which resides at the begining of the data segment | |
707 | * and is terminated with a -1. This one can be relocated in place. | |
708 | * The second is the extra relocation entries tacked after the image's | |
709 | * data segment. These require a little more processing as the entry is | |
710 | * really an offset into the image which contains an offset into the | |
711 | * image. | |
712 | */ | |
713 | if (flags & FLAT_FLAG_GOTPIC) { | |
714 | for (rp = (unsigned long *)datapos; *rp != 0xffffffff; rp++) { | |
715 | unsigned long addr; | |
716 | if (*rp) { | |
717 | addr = calc_reloc(*rp, libinfo, id, 0); | |
1ad3dcc0 LY |
718 | if (addr == RELOC_FAILED) { |
719 | ret = -ENOEXEC; | |
720 | goto err_close; | |
721 | } | |
1da177e4 LT |
722 | *rp = addr; |
723 | } | |
724 | } | |
725 | } | |
726 | ||
727 | /* | |
728 | * Now run through the relocation entries. | |
729 | * We've got to be careful here as C++ produces relocatable zero | |
730 | * entries in the constructor and destructor tables which are then | |
731 | * tested for being not zero (which will always occur unless we're | |
732 | * based from address zero). This causes an endless loop as __start | |
733 | * is at zero. The solution used is to not relocate zero addresses. | |
734 | * This has the negative side effect of not allowing a global data | |
735 | * reference to be statically initialised to _stext (I've moved | |
736 | * __start to address 4 so that is okay). | |
737 | */ | |
738 | if (rev > OLD_FLAT_VERSION) { | |
739 | for (i=0; i < relocs; i++) { | |
740 | unsigned long addr, relval; | |
741 | ||
742 | /* Get the address of the pointer to be | |
743 | relocated (of course, the address has to be | |
744 | relocated first). */ | |
745 | relval = ntohl(reloc[i]); | |
746 | addr = flat_get_relocate_addr(relval); | |
747 | rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1); | |
1ad3dcc0 LY |
748 | if (rp == (unsigned long *)RELOC_FAILED) { |
749 | ret = -ENOEXEC; | |
750 | goto err_close; | |
751 | } | |
1da177e4 LT |
752 | |
753 | /* Get the pointer's value. */ | |
754 | addr = flat_get_addr_from_rp(rp, relval, flags); | |
755 | if (addr != 0) { | |
756 | /* | |
757 | * Do the relocation. PIC relocs in the data section are | |
758 | * already in target order | |
759 | */ | |
760 | if ((flags & FLAT_FLAG_GOTPIC) == 0) | |
761 | addr = ntohl(addr); | |
762 | addr = calc_reloc(addr, libinfo, id, 0); | |
1ad3dcc0 LY |
763 | if (addr == RELOC_FAILED) { |
764 | ret = -ENOEXEC; | |
765 | goto err_close; | |
766 | } | |
1da177e4 LT |
767 | |
768 | /* Write back the relocated pointer. */ | |
769 | flat_put_addr_at_rp(rp, addr, relval); | |
770 | } | |
771 | } | |
772 | } else { | |
773 | for (i=0; i < relocs; i++) | |
774 | old_reloc(ntohl(reloc[i])); | |
775 | } | |
776 | ||
777 | flush_icache_range(start_code, end_code); | |
778 | ||
779 | /* zero the BSS, BRK and stack areas */ | |
780 | memset((void*)(datapos + data_len), 0, bss_len + | |
781 | (memp + ksize((void *) memp) - stack_len - /* end brk */ | |
782 | libinfo->lib_list[id].start_brk) + /* start brk */ | |
783 | stack_len); | |
784 | ||
785 | return 0; | |
1ad3dcc0 LY |
786 | err_close: |
787 | sys_close(exec_fileno); | |
788 | err: | |
789 | return ret; | |
1da177e4 LT |
790 | } |
791 | ||
792 | ||
793 | /****************************************************************************/ | |
794 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
795 | ||
796 | /* | |
797 | * Load a shared library into memory. The library gets its own data | |
798 | * segment (including bss) but not argv/argc/environ. | |
799 | */ | |
800 | ||
801 | static int load_flat_shared_library(int id, struct lib_info *libs) | |
802 | { | |
803 | struct linux_binprm bprm; | |
804 | int res; | |
805 | char buf[16]; | |
806 | ||
807 | /* Create the file name */ | |
808 | sprintf(buf, "/lib/lib%d.so", id); | |
809 | ||
810 | /* Open the file up */ | |
811 | bprm.filename = buf; | |
812 | bprm.file = open_exec(bprm.filename); | |
813 | res = PTR_ERR(bprm.file); | |
814 | if (IS_ERR(bprm.file)) | |
815 | return res; | |
816 | ||
817 | res = prepare_binprm(&bprm); | |
818 | ||
819 | if (res <= (unsigned long)-4096) | |
820 | res = load_flat_file(&bprm, libs, id, NULL); | |
821 | if (bprm.file) { | |
822 | allow_write_access(bprm.file); | |
823 | fput(bprm.file); | |
824 | bprm.file = NULL; | |
825 | } | |
826 | return(res); | |
827 | } | |
828 | ||
829 | #endif /* CONFIG_BINFMT_SHARED_FLAT */ | |
830 | /****************************************************************************/ | |
831 | ||
832 | /* | |
833 | * These are the functions used to load flat style executables and shared | |
834 | * libraries. There is no binary dependent code anywhere else. | |
835 | */ | |
836 | ||
837 | static int load_flat_binary(struct linux_binprm * bprm, struct pt_regs * regs) | |
838 | { | |
839 | struct lib_info libinfo; | |
840 | unsigned long p = bprm->p; | |
841 | unsigned long stack_len; | |
842 | unsigned long start_addr; | |
843 | unsigned long *sp; | |
844 | int res; | |
845 | int i, j; | |
846 | ||
847 | memset(&libinfo, 0, sizeof(libinfo)); | |
848 | /* | |
849 | * We have to add the size of our arguments to our stack size | |
850 | * otherwise it's too easy for users to create stack overflows | |
851 | * by passing in a huge argument list. And yes, we have to be | |
852 | * pedantic and include space for the argv/envp array as it may have | |
853 | * a lot of entries. | |
854 | */ | |
855 | #define TOP_OF_ARGS (PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *)) | |
856 | stack_len = TOP_OF_ARGS - bprm->p; /* the strings */ | |
857 | stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */ | |
858 | stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */ | |
859 | ||
860 | ||
861 | res = load_flat_file(bprm, &libinfo, 0, &stack_len); | |
862 | if (res > (unsigned long)-4096) | |
863 | return res; | |
864 | ||
865 | /* Update data segment pointers for all libraries */ | |
866 | for (i=0; i<MAX_SHARED_LIBS; i++) | |
867 | if (libinfo.lib_list[i].loaded) | |
868 | for (j=0; j<MAX_SHARED_LIBS; j++) | |
869 | (-(j+1))[(unsigned long *)(libinfo.lib_list[i].start_data)] = | |
870 | (libinfo.lib_list[j].loaded)? | |
871 | libinfo.lib_list[j].start_data:UNLOADED_LIB; | |
872 | ||
873 | compute_creds(bprm); | |
874 | current->flags &= ~PF_FORKNOEXEC; | |
875 | ||
876 | set_binfmt(&flat_format); | |
877 | ||
878 | p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; | |
879 | DBG_FLT("p=%x\n", (int)p); | |
880 | ||
881 | /* copy the arg pages onto the stack, this could be more efficient :-) */ | |
882 | for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--) | |
883 | * (char *) --p = | |
884 | ((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE]; | |
885 | ||
886 | sp = (unsigned long *) create_flat_tables(p, bprm); | |
887 | ||
888 | /* Fake some return addresses to ensure the call chain will | |
889 | * initialise library in order for us. We are required to call | |
890 | * lib 1 first, then 2, ... and finally the main program (id 0). | |
891 | */ | |
892 | start_addr = libinfo.lib_list[0].entry; | |
893 | ||
894 | #ifdef CONFIG_BINFMT_SHARED_FLAT | |
895 | for (i = MAX_SHARED_LIBS-1; i>0; i--) { | |
896 | if (libinfo.lib_list[i].loaded) { | |
897 | /* Push previos first to call address */ | |
898 | --sp; put_user(start_addr, sp); | |
899 | start_addr = libinfo.lib_list[i].entry; | |
900 | } | |
901 | } | |
902 | #endif | |
903 | ||
904 | /* Stash our initial stack pointer into the mm structure */ | |
905 | current->mm->start_stack = (unsigned long )sp; | |
906 | ||
907 | ||
908 | DBG_FLT("start_thread(regs=0x%x, entry=0x%x, start_stack=0x%x)\n", | |
909 | (int)regs, (int)start_addr, (int)current->mm->start_stack); | |
910 | ||
911 | start_thread(regs, start_addr, current->mm->start_stack); | |
912 | ||
913 | if (current->ptrace & PT_PTRACED) | |
914 | send_sig(SIGTRAP, current, 0); | |
915 | ||
916 | return 0; | |
917 | } | |
918 | ||
919 | /****************************************************************************/ | |
920 | ||
921 | static int __init init_flat_binfmt(void) | |
922 | { | |
923 | return register_binfmt(&flat_format); | |
924 | } | |
925 | ||
926 | static void __exit exit_flat_binfmt(void) | |
927 | { | |
928 | unregister_binfmt(&flat_format); | |
929 | } | |
930 | ||
931 | /****************************************************************************/ | |
932 | ||
933 | core_initcall(init_flat_binfmt); | |
934 | module_exit(exit_flat_binfmt); | |
935 | ||
936 | /****************************************************************************/ |