Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/fs/binfmt_flat.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 26390 byte(s)
Tag kernel26-2.6.12-alx-r9
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> |
39 | |
40 | #include <asm/byteorder.h> |
41 | #include <asm/system.h> |
42 | #include <asm/uaccess.h> |
43 | #include <asm/unaligned.h> |
44 | #include <asm/cacheflush.h> |
45 | |
46 | /****************************************************************************/ |
47 | |
48 | #if 0 |
49 | #define DEBUG 1 |
50 | #endif |
51 | |
52 | #ifdef DEBUG |
53 | #define DBG_FLT(a...) printk(a) |
54 | #else |
55 | #define DBG_FLT(a...) |
56 | #endif |
57 | |
58 | #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ |
59 | #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ |
60 | |
61 | struct lib_info { |
62 | struct { |
63 | unsigned long start_code; /* Start of text segment */ |
64 | unsigned long start_data; /* Start of data segment */ |
65 | unsigned long start_brk; /* End of data segment */ |
66 | unsigned long text_len; /* Length of text segment */ |
67 | unsigned long entry; /* Start address for this module */ |
68 | unsigned long build_date; /* When this one was compiled */ |
69 | short loaded; /* Has this library been loaded? */ |
70 | } lib_list[MAX_SHARED_LIBS]; |
71 | }; |
72 | |
73 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
74 | static int load_flat_shared_library(int id, struct lib_info *p); |
75 | #endif |
76 | |
77 | static int load_flat_binary(struct linux_binprm *, struct pt_regs * regs); |
78 | static int flat_core_dump(long signr, struct pt_regs * regs, struct file *file); |
79 | |
80 | extern void dump_thread(struct pt_regs *, struct user *); |
81 | |
82 | static struct linux_binfmt flat_format = { |
83 | .module = THIS_MODULE, |
84 | .load_binary = load_flat_binary, |
85 | .core_dump = flat_core_dump, |
86 | .min_coredump = PAGE_SIZE |
87 | }; |
88 | |
89 | /****************************************************************************/ |
90 | /* |
91 | * Routine writes a core dump image in the current directory. |
92 | * Currently only a stub-function. |
93 | */ |
94 | |
95 | static int flat_core_dump(long signr, struct pt_regs * regs, struct file *file) |
96 | { |
97 | printk("Process %s:%d received signr %d and should have core dumped\n", |
98 | current->comm, current->pid, (int) signr); |
99 | return(1); |
100 | } |
101 | |
102 | /****************************************************************************/ |
103 | /* |
104 | * create_flat_tables() parses the env- and arg-strings in new user |
105 | * memory and creates the pointer tables from them, and puts their |
106 | * addresses on the "stack", returning the new stack pointer value. |
107 | */ |
108 | |
109 | static unsigned long create_flat_tables( |
110 | unsigned long pp, |
111 | struct linux_binprm * bprm) |
112 | { |
113 | unsigned long *argv,*envp; |
114 | unsigned long * sp; |
115 | char * p = (char*)pp; |
116 | int argc = bprm->argc; |
117 | int envc = bprm->envc; |
118 | char dummy; |
119 | |
120 | sp = (unsigned long *) ((-(unsigned long)sizeof(char *))&(unsigned long) p); |
121 | |
122 | sp -= envc+1; |
123 | envp = sp; |
124 | sp -= argc+1; |
125 | argv = sp; |
126 | |
127 | flat_stack_align(sp); |
128 | if (flat_argvp_envp_on_stack()) { |
129 | --sp; put_user((unsigned long) envp, sp); |
130 | --sp; put_user((unsigned long) argv, sp); |
131 | } |
132 | |
133 | put_user(argc,--sp); |
134 | current->mm->arg_start = (unsigned long) p; |
135 | while (argc-->0) { |
136 | put_user((unsigned long) p, argv++); |
137 | do { |
138 | get_user(dummy, p); p++; |
139 | } while (dummy); |
140 | } |
141 | put_user((unsigned long) NULL, argv); |
142 | current->mm->arg_end = current->mm->env_start = (unsigned long) p; |
143 | while (envc-->0) { |
144 | put_user((unsigned long)p, envp); envp++; |
145 | do { |
146 | get_user(dummy, p); p++; |
147 | } while (dummy); |
148 | } |
149 | put_user((unsigned long) NULL, envp); |
150 | current->mm->env_end = (unsigned long) p; |
151 | return (unsigned long)sp; |
152 | } |
153 | |
154 | /****************************************************************************/ |
155 | |
156 | #ifdef CONFIG_BINFMT_ZFLAT |
157 | |
158 | #include <linux/zlib.h> |
159 | |
160 | #define LBUFSIZE 4000 |
161 | |
162 | /* gzip flag byte */ |
163 | #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */ |
164 | #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ |
165 | #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ |
166 | #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ |
167 | #define COMMENT 0x10 /* bit 4 set: file comment present */ |
168 | #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ |
169 | #define RESERVED 0xC0 /* bit 6,7: reserved */ |
170 | |
171 | static int decompress_exec( |
172 | struct linux_binprm *bprm, |
173 | unsigned long offset, |
174 | char *dst, |
175 | long len, |
176 | int fd) |
177 | { |
178 | unsigned char *buf; |
179 | z_stream strm; |
180 | loff_t fpos; |
181 | int ret, retval; |
182 | |
183 | DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len); |
184 | |
185 | memset(&strm, 0, sizeof(strm)); |
186 | strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); |
187 | if (strm.workspace == NULL) { |
188 | DBG_FLT("binfmt_flat: no memory for decompress workspace\n"); |
189 | return -ENOMEM; |
190 | } |
191 | buf = kmalloc(LBUFSIZE, GFP_KERNEL); |
192 | if (buf == NULL) { |
193 | DBG_FLT("binfmt_flat: no memory for read buffer\n"); |
194 | retval = -ENOMEM; |
195 | goto out_free; |
196 | } |
197 | |
198 | /* Read in first chunk of data and parse gzip header. */ |
199 | fpos = offset; |
200 | ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); |
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) { |
210 | DBG_FLT("binfmt_flat: file too small?\n"); |
211 | goto out_free_buf; |
212 | } |
213 | |
214 | /* Check gzip magic number */ |
215 | if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { |
216 | DBG_FLT("binfmt_flat: unknown compression magic?\n"); |
217 | goto out_free_buf; |
218 | } |
219 | |
220 | /* Check gzip method */ |
221 | if (buf[2] != 8) { |
222 | DBG_FLT("binfmt_flat: unknown compression method?\n"); |
223 | goto out_free_buf; |
224 | } |
225 | /* Check gzip flags */ |
226 | if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || |
227 | (buf[3] & RESERVED)) { |
228 | DBG_FLT("binfmt_flat: unknown flags?\n"); |
229 | goto out_free_buf; |
230 | } |
231 | |
232 | ret = 10; |
233 | if (buf[3] & EXTRA_FIELD) { |
234 | ret += 2 + buf[10] + (buf[11] << 8); |
235 | if (unlikely(LBUFSIZE == ret)) { |
236 | DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n"); |
237 | goto out_free_buf; |
238 | } |
239 | } |
240 | if (buf[3] & ORIG_NAME) { |
241 | for (; ret < LBUFSIZE && (buf[ret] != 0); ret++) |
242 | ; |
243 | if (unlikely(LBUFSIZE == ret)) { |
244 | DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n"); |
245 | goto out_free_buf; |
246 | } |
247 | } |
248 | if (buf[3] & COMMENT) { |
249 | for (; ret < LBUFSIZE && (buf[ret] != 0); ret++) |
250 | ; |
251 | if (unlikely(LBUFSIZE == ret)) { |
252 | DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n"); |
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) { |
265 | DBG_FLT("binfmt_flat: zlib init failed?\n"); |
266 | goto out_free_buf; |
267 | } |
268 | |
269 | while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { |
270 | ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); |
271 | if (ret <= 0) |
272 | break; |
273 | if (ret >= (unsigned long) -4096) |
274 | break; |
275 | len -= ret; |
276 | |
277 | strm.next_in = buf; |
278 | strm.avail_in = ret; |
279 | strm.total_in = 0; |
280 | } |
281 | |
282 | if (ret < 0) { |
283 | DBG_FLT("binfmt_flat: decompression failed (%d), %s\n", |
284 | ret, strm.msg); |
285 | goto out_zlib; |
286 | } |
287 | |
288 | retval = 0; |
289 | out_zlib: |
290 | zlib_inflateEnd(&strm); |
291 | out_free_buf: |
292 | kfree(buf); |
293 | out_free: |
294 | kfree(strm.workspace); |
295 | out: |
296 | return retval; |
297 | } |
298 | |
299 | #endif /* CONFIG_BINFMT_ZFLAT */ |
300 | |
301 | /****************************************************************************/ |
302 | |
303 | static unsigned long |
304 | calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp) |
305 | { |
306 | unsigned long addr; |
307 | int id; |
308 | unsigned long start_brk; |
309 | unsigned long start_data; |
310 | unsigned long text_len; |
311 | unsigned long start_code; |
312 | |
313 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
314 | if (r == 0) |
315 | id = curid; /* Relocs of 0 are always self referring */ |
316 | else { |
317 | id = (r >> 24) & 0xff; /* Find ID for this reloc */ |
318 | r &= 0x00ffffff; /* Trim ID off here */ |
319 | } |
320 | if (id >= MAX_SHARED_LIBS) { |
321 | printk("BINFMT_FLAT: reference 0x%x to shared library %d", |
322 | (unsigned) r, id); |
323 | goto failed; |
324 | } |
325 | if (curid != id) { |
326 | if (internalp) { |
327 | printk("BINFMT_FLAT: reloc address 0x%x not in same module " |
328 | "(%d != %d)", (unsigned) r, curid, id); |
329 | goto failed; |
330 | } else if ( ! p->lib_list[id].loaded && |
331 | load_flat_shared_library(id, p) > (unsigned long) -4096) { |
332 | printk("BINFMT_FLAT: failed to load library %d", id); |
333 | goto failed; |
334 | } |
335 | /* Check versioning information (i.e. time stamps) */ |
336 | if (p->lib_list[id].build_date && p->lib_list[curid].build_date && |
337 | p->lib_list[curid].build_date < p->lib_list[id].build_date) { |
338 | printk("BINFMT_FLAT: library %d is younger than %d", id, curid); |
339 | goto failed; |
340 | } |
341 | } |
342 | #else |
343 | id = 0; |
344 | #endif |
345 | |
346 | start_brk = p->lib_list[id].start_brk; |
347 | start_data = p->lib_list[id].start_data; |
348 | start_code = p->lib_list[id].start_code; |
349 | text_len = p->lib_list[id].text_len; |
350 | |
351 | if (!flat_reloc_valid(r, start_brk - start_data + text_len)) { |
352 | printk("BINFMT_FLAT: reloc outside program 0x%x (0 - 0x%x/0x%x)", |
353 | (int) r,(int)(start_brk-start_code),(int)text_len); |
354 | goto failed; |
355 | } |
356 | |
357 | if (r < text_len) /* In text segment */ |
358 | addr = r + start_code; |
359 | else /* In data segment */ |
360 | addr = r - text_len + start_data; |
361 | |
362 | /* Range checked already above so doing the range tests is redundant...*/ |
363 | return(addr); |
364 | |
365 | failed: |
366 | printk(", killing %s!\n", current->comm); |
367 | send_sig(SIGSEGV, current, 0); |
368 | |
369 | return RELOC_FAILED; |
370 | } |
371 | |
372 | /****************************************************************************/ |
373 | |
374 | void old_reloc(unsigned long rl) |
375 | { |
376 | #ifdef DEBUG |
377 | char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; |
378 | #endif |
379 | flat_v2_reloc_t r; |
380 | unsigned long *ptr; |
381 | |
382 | r.value = rl; |
383 | #if defined(CONFIG_COLDFIRE) |
384 | ptr = (unsigned long *) (current->mm->start_code + r.reloc.offset); |
385 | #else |
386 | ptr = (unsigned long *) (current->mm->start_data + r.reloc.offset); |
387 | #endif |
388 | |
389 | #ifdef DEBUG |
390 | printk("Relocation of variable at DATASEG+%x " |
391 | "(address %p, currently %x) into segment %s\n", |
392 | r.reloc.offset, ptr, (int)*ptr, segment[r.reloc.type]); |
393 | #endif |
394 | |
395 | switch (r.reloc.type) { |
396 | case OLD_FLAT_RELOC_TYPE_TEXT: |
397 | *ptr += current->mm->start_code; |
398 | break; |
399 | case OLD_FLAT_RELOC_TYPE_DATA: |
400 | *ptr += current->mm->start_data; |
401 | break; |
402 | case OLD_FLAT_RELOC_TYPE_BSS: |
403 | *ptr += current->mm->end_data; |
404 | break; |
405 | default: |
406 | printk("BINFMT_FLAT: Unknown relocation type=%x\n", r.reloc.type); |
407 | break; |
408 | } |
409 | |
410 | #ifdef DEBUG |
411 | printk("Relocation became %x\n", (int)*ptr); |
412 | #endif |
413 | } |
414 | |
415 | /****************************************************************************/ |
416 | |
417 | static int load_flat_file(struct linux_binprm * bprm, |
418 | struct lib_info *libinfo, int id, unsigned long *extra_stack) |
419 | { |
420 | struct flat_hdr * hdr; |
421 | unsigned long textpos = 0, datapos = 0, result; |
422 | unsigned long realdatastart = 0; |
423 | unsigned long text_len, data_len, bss_len, stack_len, flags; |
424 | unsigned long memp = 0; /* for finding the brk area */ |
425 | unsigned long extra, rlim; |
426 | unsigned long *reloc = 0, *rp; |
427 | struct inode *inode; |
428 | int i, rev, relocs = 0; |
429 | loff_t fpos; |
430 | unsigned long start_code, end_code; |
431 | |
432 | hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ |
433 | inode = bprm->file->f_dentry->d_inode; |
434 | |
435 | text_len = ntohl(hdr->data_start); |
436 | data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); |
437 | bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); |
438 | stack_len = ntohl(hdr->stack_size); |
439 | if (extra_stack) { |
440 | stack_len += *extra_stack; |
441 | *extra_stack = stack_len; |
442 | } |
443 | relocs = ntohl(hdr->reloc_count); |
444 | flags = ntohl(hdr->flags); |
445 | rev = ntohl(hdr->rev); |
446 | |
447 | if (flags & FLAT_FLAG_KTRACE) |
448 | printk("BINFMT_FLAT: Loading file: %s\n", bprm->filename); |
449 | |
450 | if (strncmp(hdr->magic, "bFLT", 4) || |
451 | (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION)) { |
452 | /* |
453 | * because a lot of people do not manage to produce good |
454 | * flat binaries, we leave this printk to help them realise |
455 | * the problem. We only print the error if its not a script file |
456 | */ |
457 | if (strncmp(hdr->magic, "#!", 2)) |
458 | printk("BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n", |
459 | rev, (int) FLAT_VERSION); |
460 | return -ENOEXEC; |
461 | } |
462 | |
463 | /* Don't allow old format executables to use shared libraries */ |
464 | if (rev == OLD_FLAT_VERSION && id != 0) { |
465 | printk("BINFMT_FLAT: shared libraries are not available before rev 0x%x\n", |
466 | (int) FLAT_VERSION); |
467 | return -ENOEXEC; |
468 | } |
469 | |
470 | /* |
471 | * fix up the flags for the older format, there were all kinds |
472 | * of endian hacks, this only works for the simple cases |
473 | */ |
474 | if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags)) |
475 | flags = FLAT_FLAG_RAM; |
476 | |
477 | #ifndef CONFIG_BINFMT_ZFLAT |
478 | if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { |
479 | printk("Support for ZFLAT executables is not enabled.\n"); |
480 | return -ENOEXEC; |
481 | } |
482 | #endif |
483 | |
484 | /* |
485 | * Check initial limits. This avoids letting people circumvent |
486 | * size limits imposed on them by creating programs with large |
487 | * arrays in the data or bss. |
488 | */ |
489 | rlim = current->signal->rlim[RLIMIT_DATA].rlim_cur; |
490 | if (rlim >= RLIM_INFINITY) |
491 | rlim = ~0; |
492 | if (data_len + bss_len > rlim) |
493 | return -ENOMEM; |
494 | |
495 | /* Flush all traces of the currently running executable */ |
496 | if (id == 0) { |
497 | result = flush_old_exec(bprm); |
498 | if (result) |
499 | return result; |
500 | |
501 | /* OK, This is the point of no return */ |
502 | set_personality(PER_LINUX); |
503 | } |
504 | |
505 | /* |
506 | * calculate the extra space we need to map in |
507 | */ |
508 | extra = max(bss_len + stack_len, relocs * sizeof(unsigned long)); |
509 | |
510 | /* |
511 | * there are a couple of cases here, the separate code/data |
512 | * case, and then the fully copied to RAM case which lumps |
513 | * it all together. |
514 | */ |
515 | if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) { |
516 | /* |
517 | * this should give us a ROM ptr, but if it doesn't we don't |
518 | * really care |
519 | */ |
520 | DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n"); |
521 | |
522 | down_write(¤t->mm->mmap_sem); |
523 | textpos = do_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, MAP_SHARED, 0); |
524 | up_write(¤t->mm->mmap_sem); |
525 | if (!textpos || textpos >= (unsigned long) -4096) { |
526 | if (!textpos) |
527 | textpos = (unsigned long) -ENOMEM; |
528 | printk("Unable to mmap process text, errno %d\n", (int)-textpos); |
529 | return(textpos); |
530 | } |
531 | |
532 | down_write(¤t->mm->mmap_sem); |
533 | realdatastart = do_mmap(0, 0, data_len + extra + |
534 | MAX_SHARED_LIBS * sizeof(unsigned long), |
535 | PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); |
536 | up_write(¤t->mm->mmap_sem); |
537 | |
538 | if (realdatastart == 0 || realdatastart >= (unsigned long)-4096) { |
539 | if (!realdatastart) |
540 | realdatastart = (unsigned long) -ENOMEM; |
541 | printk("Unable to allocate RAM for process data, errno %d\n", |
542 | (int)-datapos); |
543 | do_munmap(current->mm, textpos, text_len); |
544 | return realdatastart; |
545 | } |
546 | datapos = realdatastart + MAX_SHARED_LIBS * sizeof(unsigned long); |
547 | |
548 | DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n", |
549 | (int)(data_len + bss_len + stack_len), (int)datapos); |
550 | |
551 | fpos = ntohl(hdr->data_start); |
552 | #ifdef CONFIG_BINFMT_ZFLAT |
553 | if (flags & FLAT_FLAG_GZDATA) { |
554 | result = decompress_exec(bprm, fpos, (char *) datapos, |
555 | data_len + (relocs * sizeof(unsigned long)), 0); |
556 | } else |
557 | #endif |
558 | { |
559 | result = bprm->file->f_op->read(bprm->file, (char *) datapos, |
560 | data_len + (relocs * sizeof(unsigned long)), &fpos); |
561 | } |
562 | if (result >= (unsigned long)-4096) { |
563 | printk("Unable to read data+bss, errno %d\n", (int)-result); |
564 | do_munmap(current->mm, textpos, text_len); |
565 | do_munmap(current->mm, realdatastart, data_len + extra); |
566 | return result; |
567 | } |
568 | |
569 | reloc = (unsigned long *) (datapos+(ntohl(hdr->reloc_start)-text_len)); |
570 | memp = realdatastart; |
571 | |
572 | } else { |
573 | |
574 | down_write(¤t->mm->mmap_sem); |
575 | textpos = do_mmap(0, 0, text_len + data_len + extra + |
576 | MAX_SHARED_LIBS * sizeof(unsigned long), |
577 | PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); |
578 | up_write(¤t->mm->mmap_sem); |
579 | if (!textpos || textpos >= (unsigned long) -4096) { |
580 | if (!textpos) |
581 | textpos = (unsigned long) -ENOMEM; |
582 | printk("Unable to allocate RAM for process text/data, errno %d\n", |
583 | (int)-textpos); |
584 | return(textpos); |
585 | } |
586 | |
587 | realdatastart = textpos + ntohl(hdr->data_start); |
588 | datapos = realdatastart + MAX_SHARED_LIBS * sizeof(unsigned long); |
589 | reloc = (unsigned long *) (textpos + ntohl(hdr->reloc_start) + |
590 | MAX_SHARED_LIBS * sizeof(unsigned long)); |
591 | memp = textpos; |
592 | |
593 | #ifdef CONFIG_BINFMT_ZFLAT |
594 | /* |
595 | * load it all in and treat it like a RAM load from now on |
596 | */ |
597 | if (flags & FLAT_FLAG_GZIP) { |
598 | result = decompress_exec(bprm, sizeof (struct flat_hdr), |
599 | (((char *) textpos) + sizeof (struct flat_hdr)), |
600 | (text_len + data_len + (relocs * sizeof(unsigned long)) |
601 | - sizeof (struct flat_hdr)), |
602 | 0); |
603 | memmove((void *) datapos, (void *) realdatastart, |
604 | data_len + (relocs * sizeof(unsigned long))); |
605 | } else if (flags & FLAT_FLAG_GZDATA) { |
606 | fpos = 0; |
607 | result = bprm->file->f_op->read(bprm->file, |
608 | (char *) textpos, text_len, &fpos); |
609 | if (result < (unsigned long) -4096) |
610 | result = decompress_exec(bprm, text_len, (char *) datapos, |
611 | data_len + (relocs * sizeof(unsigned long)), 0); |
612 | } |
613 | else |
614 | #endif |
615 | { |
616 | fpos = 0; |
617 | result = bprm->file->f_op->read(bprm->file, |
618 | (char *) textpos, text_len, &fpos); |
619 | if (result < (unsigned long) -4096) { |
620 | fpos = ntohl(hdr->data_start); |
621 | result = bprm->file->f_op->read(bprm->file, (char *) datapos, |
622 | data_len + (relocs * sizeof(unsigned long)), &fpos); |
623 | } |
624 | } |
625 | if (result >= (unsigned long)-4096) { |
626 | printk("Unable to read code+data+bss, errno %d\n",(int)-result); |
627 | do_munmap(current->mm, textpos, text_len + data_len + extra + |
628 | MAX_SHARED_LIBS * sizeof(unsigned long)); |
629 | return result; |
630 | } |
631 | } |
632 | |
633 | if (flags & FLAT_FLAG_KTRACE) |
634 | printk("Mapping is %x, Entry point is %x, data_start is %x\n", |
635 | (int)textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); |
636 | |
637 | /* The main program needs a little extra setup in the task structure */ |
638 | start_code = textpos + sizeof (struct flat_hdr); |
639 | end_code = textpos + text_len; |
640 | if (id == 0) { |
641 | current->mm->start_code = start_code; |
642 | current->mm->end_code = end_code; |
643 | current->mm->start_data = datapos; |
644 | current->mm->end_data = datapos + data_len; |
645 | /* |
646 | * set up the brk stuff, uses any slack left in data/bss/stack |
647 | * allocation. We put the brk after the bss (between the bss |
648 | * and stack) like other platforms. |
649 | */ |
650 | current->mm->start_brk = datapos + data_len + bss_len; |
651 | current->mm->brk = (current->mm->start_brk + 3) & ~3; |
652 | current->mm->context.end_brk = memp + ksize((void *) memp) - stack_len; |
653 | set_mm_counter(current->mm, rss, 0); |
654 | } |
655 | |
656 | if (flags & FLAT_FLAG_KTRACE) |
657 | printk("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n", |
658 | id ? "Lib" : "Load", bprm->filename, |
659 | (int) start_code, (int) end_code, |
660 | (int) datapos, |
661 | (int) (datapos + data_len), |
662 | (int) (datapos + data_len), |
663 | (int) (((datapos + data_len + bss_len) + 3) & ~3)); |
664 | |
665 | text_len -= sizeof(struct flat_hdr); /* the real code len */ |
666 | |
667 | /* Store the current module values into the global library structure */ |
668 | libinfo->lib_list[id].start_code = start_code; |
669 | libinfo->lib_list[id].start_data = datapos; |
670 | libinfo->lib_list[id].start_brk = datapos + data_len + bss_len; |
671 | libinfo->lib_list[id].text_len = text_len; |
672 | libinfo->lib_list[id].loaded = 1; |
673 | libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; |
674 | libinfo->lib_list[id].build_date = ntohl(hdr->build_date); |
675 | |
676 | /* |
677 | * We just load the allocations into some temporary memory to |
678 | * help simplify all this mumbo jumbo |
679 | * |
680 | * We've got two different sections of relocation entries. |
681 | * The first is the GOT which resides at the begining of the data segment |
682 | * and is terminated with a -1. This one can be relocated in place. |
683 | * The second is the extra relocation entries tacked after the image's |
684 | * data segment. These require a little more processing as the entry is |
685 | * really an offset into the image which contains an offset into the |
686 | * image. |
687 | */ |
688 | if (flags & FLAT_FLAG_GOTPIC) { |
689 | for (rp = (unsigned long *)datapos; *rp != 0xffffffff; rp++) { |
690 | unsigned long addr; |
691 | if (*rp) { |
692 | addr = calc_reloc(*rp, libinfo, id, 0); |
693 | if (addr == RELOC_FAILED) |
694 | return -ENOEXEC; |
695 | *rp = addr; |
696 | } |
697 | } |
698 | } |
699 | |
700 | /* |
701 | * Now run through the relocation entries. |
702 | * We've got to be careful here as C++ produces relocatable zero |
703 | * entries in the constructor and destructor tables which are then |
704 | * tested for being not zero (which will always occur unless we're |
705 | * based from address zero). This causes an endless loop as __start |
706 | * is at zero. The solution used is to not relocate zero addresses. |
707 | * This has the negative side effect of not allowing a global data |
708 | * reference to be statically initialised to _stext (I've moved |
709 | * __start to address 4 so that is okay). |
710 | */ |
711 | if (rev > OLD_FLAT_VERSION) { |
712 | for (i=0; i < relocs; i++) { |
713 | unsigned long addr, relval; |
714 | |
715 | /* Get the address of the pointer to be |
716 | relocated (of course, the address has to be |
717 | relocated first). */ |
718 | relval = ntohl(reloc[i]); |
719 | addr = flat_get_relocate_addr(relval); |
720 | rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1); |
721 | if (rp == (unsigned long *)RELOC_FAILED) |
722 | return -ENOEXEC; |
723 | |
724 | /* Get the pointer's value. */ |
725 | addr = flat_get_addr_from_rp(rp, relval, flags); |
726 | if (addr != 0) { |
727 | /* |
728 | * Do the relocation. PIC relocs in the data section are |
729 | * already in target order |
730 | */ |
731 | if ((flags & FLAT_FLAG_GOTPIC) == 0) |
732 | addr = ntohl(addr); |
733 | addr = calc_reloc(addr, libinfo, id, 0); |
734 | if (addr == RELOC_FAILED) |
735 | return -ENOEXEC; |
736 | |
737 | /* Write back the relocated pointer. */ |
738 | flat_put_addr_at_rp(rp, addr, relval); |
739 | } |
740 | } |
741 | } else { |
742 | for (i=0; i < relocs; i++) |
743 | old_reloc(ntohl(reloc[i])); |
744 | } |
745 | |
746 | flush_icache_range(start_code, end_code); |
747 | |
748 | /* zero the BSS, BRK and stack areas */ |
749 | memset((void*)(datapos + data_len), 0, bss_len + |
750 | (memp + ksize((void *) memp) - stack_len - /* end brk */ |
751 | libinfo->lib_list[id].start_brk) + /* start brk */ |
752 | stack_len); |
753 | |
754 | return 0; |
755 | } |
756 | |
757 | |
758 | /****************************************************************************/ |
759 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
760 | |
761 | /* |
762 | * Load a shared library into memory. The library gets its own data |
763 | * segment (including bss) but not argv/argc/environ. |
764 | */ |
765 | |
766 | static int load_flat_shared_library(int id, struct lib_info *libs) |
767 | { |
768 | struct linux_binprm bprm; |
769 | int res; |
770 | char buf[16]; |
771 | |
772 | /* Create the file name */ |
773 | sprintf(buf, "/lib/lib%d.so", id); |
774 | |
775 | /* Open the file up */ |
776 | bprm.filename = buf; |
777 | bprm.file = open_exec(bprm.filename); |
778 | res = PTR_ERR(bprm.file); |
779 | if (IS_ERR(bprm.file)) |
780 | return res; |
781 | |
782 | res = prepare_binprm(&bprm); |
783 | |
784 | if (res <= (unsigned long)-4096) |
785 | res = load_flat_file(&bprm, libs, id, NULL); |
786 | if (bprm.file) { |
787 | allow_write_access(bprm.file); |
788 | fput(bprm.file); |
789 | bprm.file = NULL; |
790 | } |
791 | return(res); |
792 | } |
793 | |
794 | #endif /* CONFIG_BINFMT_SHARED_FLAT */ |
795 | /****************************************************************************/ |
796 | |
797 | /* |
798 | * These are the functions used to load flat style executables and shared |
799 | * libraries. There is no binary dependent code anywhere else. |
800 | */ |
801 | |
802 | static int load_flat_binary(struct linux_binprm * bprm, struct pt_regs * regs) |
803 | { |
804 | struct lib_info libinfo; |
805 | unsigned long p = bprm->p; |
806 | unsigned long stack_len; |
807 | unsigned long start_addr; |
808 | unsigned long *sp; |
809 | int res; |
810 | int i, j; |
811 | |
812 | memset(&libinfo, 0, sizeof(libinfo)); |
813 | /* |
814 | * We have to add the size of our arguments to our stack size |
815 | * otherwise it's too easy for users to create stack overflows |
816 | * by passing in a huge argument list. And yes, we have to be |
817 | * pedantic and include space for the argv/envp array as it may have |
818 | * a lot of entries. |
819 | */ |
820 | #define TOP_OF_ARGS (PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *)) |
821 | stack_len = TOP_OF_ARGS - bprm->p; /* the strings */ |
822 | stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */ |
823 | stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */ |
824 | |
825 | |
826 | res = load_flat_file(bprm, &libinfo, 0, &stack_len); |
827 | if (res > (unsigned long)-4096) |
828 | return res; |
829 | |
830 | /* Update data segment pointers for all libraries */ |
831 | for (i=0; i<MAX_SHARED_LIBS; i++) |
832 | if (libinfo.lib_list[i].loaded) |
833 | for (j=0; j<MAX_SHARED_LIBS; j++) |
834 | (-(j+1))[(unsigned long *)(libinfo.lib_list[i].start_data)] = |
835 | (libinfo.lib_list[j].loaded)? |
836 | libinfo.lib_list[j].start_data:UNLOADED_LIB; |
837 | |
838 | compute_creds(bprm); |
839 | current->flags &= ~PF_FORKNOEXEC; |
840 | |
841 | set_binfmt(&flat_format); |
842 | |
843 | p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; |
844 | DBG_FLT("p=%x\n", (int)p); |
845 | |
846 | /* copy the arg pages onto the stack, this could be more efficient :-) */ |
847 | for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--) |
848 | * (char *) --p = |
849 | ((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE]; |
850 | |
851 | sp = (unsigned long *) create_flat_tables(p, bprm); |
852 | |
853 | /* Fake some return addresses to ensure the call chain will |
854 | * initialise library in order for us. We are required to call |
855 | * lib 1 first, then 2, ... and finally the main program (id 0). |
856 | */ |
857 | start_addr = libinfo.lib_list[0].entry; |
858 | |
859 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
860 | for (i = MAX_SHARED_LIBS-1; i>0; i--) { |
861 | if (libinfo.lib_list[i].loaded) { |
862 | /* Push previos first to call address */ |
863 | --sp; put_user(start_addr, sp); |
864 | start_addr = libinfo.lib_list[i].entry; |
865 | } |
866 | } |
867 | #endif |
868 | |
869 | /* Stash our initial stack pointer into the mm structure */ |
870 | current->mm->start_stack = (unsigned long )sp; |
871 | |
872 | |
873 | DBG_FLT("start_thread(regs=0x%x, entry=0x%x, start_stack=0x%x)\n", |
874 | (int)regs, (int)start_addr, (int)current->mm->start_stack); |
875 | |
876 | start_thread(regs, start_addr, current->mm->start_stack); |
877 | |
878 | if (current->ptrace & PT_PTRACED) |
879 | send_sig(SIGTRAP, current, 0); |
880 | |
881 | return 0; |
882 | } |
883 | |
884 | /****************************************************************************/ |
885 | |
886 | static int __init init_flat_binfmt(void) |
887 | { |
888 | return register_binfmt(&flat_format); |
889 | } |
890 | |
891 | static void __exit exit_flat_binfmt(void) |
892 | { |
893 | unregister_binfmt(&flat_format); |
894 | } |
895 | |
896 | /****************************************************************************/ |
897 | |
898 | core_initcall(init_flat_binfmt); |
899 | module_exit(exit_flat_binfmt); |
900 | |
901 | /****************************************************************************/ |