Root/
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/kernel.h> |
20 | #include <linux/sched.h> |
21 | #include <linux/mm.h> |
22 | #include <linux/mman.h> |
23 | #include <linux/errno.h> |
24 | #include <linux/signal.h> |
25 | #include <linux/string.h> |
26 | #include <linux/fs.h> |
27 | #include <linux/file.h> |
28 | #include <linux/stat.h> |
29 | #include <linux/fcntl.h> |
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> |
37 | #include <linux/syscalls.h> |
38 | |
39 | #include <asm/byteorder.h> |
40 | #include <asm/system.h> |
41 | #include <asm/uaccess.h> |
42 | #include <asm/unaligned.h> |
43 | #include <asm/cacheflush.h> |
44 | #include <asm/page.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 | /* |
59 | * User data (stack, data section and bss) needs to be aligned |
60 | * for the same reasons as SLAB memory is, and to the same amount. |
61 | * Avoid duplicating architecture specific code by using the same |
62 | * macro as with SLAB allocation: |
63 | */ |
64 | #ifdef ARCH_SLAB_MINALIGN |
65 | #define FLAT_DATA_ALIGN (ARCH_SLAB_MINALIGN) |
66 | #else |
67 | #define FLAT_DATA_ALIGN (sizeof(void *)) |
68 | #endif |
69 | |
70 | #define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */ |
71 | #define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */ |
72 | |
73 | struct lib_info { |
74 | struct { |
75 | unsigned long start_code; /* Start of text segment */ |
76 | unsigned long start_data; /* Start of data segment */ |
77 | unsigned long start_brk; /* End of data segment */ |
78 | unsigned long text_len; /* Length of text segment */ |
79 | unsigned long entry; /* Start address for this module */ |
80 | unsigned long build_date; /* When this one was compiled */ |
81 | short loaded; /* Has this library been loaded? */ |
82 | } lib_list[MAX_SHARED_LIBS]; |
83 | }; |
84 | |
85 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
86 | static int load_flat_shared_library(int id, struct lib_info *p); |
87 | #endif |
88 | |
89 | static int load_flat_binary(struct linux_binprm *, struct pt_regs * regs); |
90 | static int flat_core_dump(struct coredump_params *cprm); |
91 | |
92 | static struct linux_binfmt flat_format = { |
93 | .module = THIS_MODULE, |
94 | .load_binary = load_flat_binary, |
95 | .core_dump = flat_core_dump, |
96 | .min_coredump = PAGE_SIZE |
97 | }; |
98 | |
99 | /****************************************************************************/ |
100 | /* |
101 | * Routine writes a core dump image in the current directory. |
102 | * Currently only a stub-function. |
103 | */ |
104 | |
105 | static int flat_core_dump(struct coredump_params *cprm) |
106 | { |
107 | printk("Process %s:%d received signr %d and should have core dumped\n", |
108 | current->comm, current->pid, (int) cprm->signr); |
109 | return(1); |
110 | } |
111 | |
112 | /****************************************************************************/ |
113 | /* |
114 | * create_flat_tables() parses the env- and arg-strings in new user |
115 | * memory and creates the pointer tables from them, and puts their |
116 | * addresses on the "stack", returning the new stack pointer value. |
117 | */ |
118 | |
119 | static unsigned long create_flat_tables( |
120 | unsigned long pp, |
121 | struct linux_binprm * bprm) |
122 | { |
123 | unsigned long *argv,*envp; |
124 | unsigned long * sp; |
125 | char * p = (char*)pp; |
126 | int argc = bprm->argc; |
127 | int envc = bprm->envc; |
128 | char uninitialized_var(dummy); |
129 | |
130 | sp = (unsigned long *)p; |
131 | sp -= (envc + argc + 2) + 1 + (flat_argvp_envp_on_stack() ? 2 : 0); |
132 | sp = (unsigned long *) ((unsigned long)sp & -FLAT_DATA_ALIGN); |
133 | argv = sp + 1 + (flat_argvp_envp_on_stack() ? 2 : 0); |
134 | envp = argv + (argc + 1); |
135 | |
136 | if (flat_argvp_envp_on_stack()) { |
137 | put_user((unsigned long) envp, sp + 2); |
138 | put_user((unsigned long) argv, sp + 1); |
139 | } |
140 | |
141 | put_user(argc, sp); |
142 | current->mm->arg_start = (unsigned long) p; |
143 | while (argc-->0) { |
144 | put_user((unsigned long) p, argv++); |
145 | do { |
146 | get_user(dummy, p); p++; |
147 | } while (dummy); |
148 | } |
149 | put_user((unsigned long) NULL, argv); |
150 | current->mm->arg_end = current->mm->env_start = (unsigned long) p; |
151 | while (envc-->0) { |
152 | put_user((unsigned long)p, envp); envp++; |
153 | do { |
154 | get_user(dummy, p); p++; |
155 | } while (dummy); |
156 | } |
157 | put_user((unsigned long) NULL, envp); |
158 | current->mm->env_end = (unsigned long) p; |
159 | return (unsigned long)sp; |
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 | |
179 | static int decompress_exec( |
180 | struct linux_binprm *bprm, |
181 | unsigned long offset, |
182 | char *dst, |
183 | long len, |
184 | int fd) |
185 | { |
186 | unsigned char *buf; |
187 | z_stream strm; |
188 | loff_t fpos; |
189 | int ret, retval; |
190 | |
191 | DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len); |
192 | |
193 | memset(&strm, 0, sizeof(strm)); |
194 | strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL); |
195 | if (strm.workspace == NULL) { |
196 | DBG_FLT("binfmt_flat: no memory for decompress workspace\n"); |
197 | return -ENOMEM; |
198 | } |
199 | buf = kmalloc(LBUFSIZE, GFP_KERNEL); |
200 | if (buf == NULL) { |
201 | DBG_FLT("binfmt_flat: no memory for read buffer\n"); |
202 | retval = -ENOMEM; |
203 | goto out_free; |
204 | } |
205 | |
206 | /* Read in first chunk of data and parse gzip header. */ |
207 | fpos = offset; |
208 | ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); |
209 | |
210 | strm.next_in = buf; |
211 | strm.avail_in = ret; |
212 | strm.total_in = 0; |
213 | |
214 | retval = -ENOEXEC; |
215 | |
216 | /* Check minimum size -- gzip header */ |
217 | if (ret < 10) { |
218 | DBG_FLT("binfmt_flat: file too small?\n"); |
219 | goto out_free_buf; |
220 | } |
221 | |
222 | /* Check gzip magic number */ |
223 | if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) { |
224 | DBG_FLT("binfmt_flat: unknown compression magic?\n"); |
225 | goto out_free_buf; |
226 | } |
227 | |
228 | /* Check gzip method */ |
229 | if (buf[2] != 8) { |
230 | DBG_FLT("binfmt_flat: unknown compression method?\n"); |
231 | goto out_free_buf; |
232 | } |
233 | /* Check gzip flags */ |
234 | if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) || |
235 | (buf[3] & RESERVED)) { |
236 | DBG_FLT("binfmt_flat: unknown flags?\n"); |
237 | goto out_free_buf; |
238 | } |
239 | |
240 | ret = 10; |
241 | if (buf[3] & EXTRA_FIELD) { |
242 | ret += 2 + buf[10] + (buf[11] << 8); |
243 | if (unlikely(LBUFSIZE <= ret)) { |
244 | DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n"); |
245 | goto out_free_buf; |
246 | } |
247 | } |
248 | if (buf[3] & ORIG_NAME) { |
249 | while (ret < LBUFSIZE && buf[ret++] != 0) |
250 | ; |
251 | if (unlikely(LBUFSIZE == ret)) { |
252 | DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n"); |
253 | goto out_free_buf; |
254 | } |
255 | } |
256 | if (buf[3] & COMMENT) { |
257 | while (ret < LBUFSIZE && buf[ret++] != 0) |
258 | ; |
259 | if (unlikely(LBUFSIZE == ret)) { |
260 | DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n"); |
261 | goto out_free_buf; |
262 | } |
263 | } |
264 | |
265 | strm.next_in += ret; |
266 | strm.avail_in -= ret; |
267 | |
268 | strm.next_out = dst; |
269 | strm.avail_out = len; |
270 | strm.total_out = 0; |
271 | |
272 | if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) { |
273 | DBG_FLT("binfmt_flat: zlib init failed?\n"); |
274 | goto out_free_buf; |
275 | } |
276 | |
277 | while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) { |
278 | ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); |
279 | if (ret <= 0) |
280 | break; |
281 | len -= ret; |
282 | |
283 | strm.next_in = buf; |
284 | strm.avail_in = ret; |
285 | strm.total_in = 0; |
286 | } |
287 | |
288 | if (ret < 0) { |
289 | DBG_FLT("binfmt_flat: decompression failed (%d), %s\n", |
290 | ret, strm.msg); |
291 | goto out_zlib; |
292 | } |
293 | |
294 | retval = 0; |
295 | out_zlib: |
296 | zlib_inflateEnd(&strm); |
297 | out_free_buf: |
298 | kfree(buf); |
299 | out_free: |
300 | kfree(strm.workspace); |
301 | return retval; |
302 | } |
303 | |
304 | #endif /* CONFIG_BINFMT_ZFLAT */ |
305 | |
306 | /****************************************************************************/ |
307 | |
308 | static unsigned long |
309 | calc_reloc(unsigned long r, struct lib_info *p, int curid, int internalp) |
310 | { |
311 | unsigned long addr; |
312 | int id; |
313 | unsigned long start_brk; |
314 | unsigned long start_data; |
315 | unsigned long text_len; |
316 | unsigned long start_code; |
317 | |
318 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
319 | if (r == 0) |
320 | id = curid; /* Relocs of 0 are always self referring */ |
321 | else { |
322 | id = (r >> 24) & 0xff; /* Find ID for this reloc */ |
323 | r &= 0x00ffffff; /* Trim ID off here */ |
324 | } |
325 | if (id >= MAX_SHARED_LIBS) { |
326 | printk("BINFMT_FLAT: reference 0x%x to shared library %d", |
327 | (unsigned) r, id); |
328 | goto failed; |
329 | } |
330 | if (curid != id) { |
331 | if (internalp) { |
332 | printk("BINFMT_FLAT: reloc address 0x%x not in same module " |
333 | "(%d != %d)", (unsigned) r, curid, id); |
334 | goto failed; |
335 | } else if ( ! p->lib_list[id].loaded && |
336 | IS_ERR_VALUE(load_flat_shared_library(id, p))) { |
337 | printk("BINFMT_FLAT: failed to load library %d", id); |
338 | goto failed; |
339 | } |
340 | /* Check versioning information (i.e. time stamps) */ |
341 | if (p->lib_list[id].build_date && p->lib_list[curid].build_date && |
342 | p->lib_list[curid].build_date < p->lib_list[id].build_date) { |
343 | printk("BINFMT_FLAT: library %d is younger than %d", id, curid); |
344 | goto failed; |
345 | } |
346 | } |
347 | #else |
348 | id = 0; |
349 | #endif |
350 | |
351 | start_brk = p->lib_list[id].start_brk; |
352 | start_data = p->lib_list[id].start_data; |
353 | start_code = p->lib_list[id].start_code; |
354 | text_len = p->lib_list[id].text_len; |
355 | |
356 | if (!flat_reloc_valid(r, start_brk - start_data + text_len)) { |
357 | printk("BINFMT_FLAT: reloc outside program 0x%x (0 - 0x%x/0x%x)", |
358 | (int) r,(int)(start_brk-start_data+text_len),(int)text_len); |
359 | goto failed; |
360 | } |
361 | |
362 | if (r < text_len) /* In text segment */ |
363 | addr = r + start_code; |
364 | else /* In data segment */ |
365 | addr = r - text_len + start_data; |
366 | |
367 | /* Range checked already above so doing the range tests is redundant...*/ |
368 | return(addr); |
369 | |
370 | failed: |
371 | printk(", killing %s!\n", current->comm); |
372 | send_sig(SIGSEGV, current, 0); |
373 | |
374 | return RELOC_FAILED; |
375 | } |
376 | |
377 | /****************************************************************************/ |
378 | |
379 | void old_reloc(unsigned long rl) |
380 | { |
381 | #ifdef DEBUG |
382 | char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" }; |
383 | #endif |
384 | flat_v2_reloc_t r; |
385 | unsigned long *ptr; |
386 | |
387 | r.value = rl; |
388 | #if defined(CONFIG_COLDFIRE) |
389 | ptr = (unsigned long *) (current->mm->start_code + r.reloc.offset); |
390 | #else |
391 | ptr = (unsigned long *) (current->mm->start_data + r.reloc.offset); |
392 | #endif |
393 | |
394 | #ifdef DEBUG |
395 | printk("Relocation of variable at DATASEG+%x " |
396 | "(address %p, currently %x) into segment %s\n", |
397 | r.reloc.offset, ptr, (int)*ptr, segment[r.reloc.type]); |
398 | #endif |
399 | |
400 | switch (r.reloc.type) { |
401 | case OLD_FLAT_RELOC_TYPE_TEXT: |
402 | *ptr += current->mm->start_code; |
403 | break; |
404 | case OLD_FLAT_RELOC_TYPE_DATA: |
405 | *ptr += current->mm->start_data; |
406 | break; |
407 | case OLD_FLAT_RELOC_TYPE_BSS: |
408 | *ptr += current->mm->end_data; |
409 | break; |
410 | default: |
411 | printk("BINFMT_FLAT: Unknown relocation type=%x\n", r.reloc.type); |
412 | break; |
413 | } |
414 | |
415 | #ifdef DEBUG |
416 | printk("Relocation became %x\n", (int)*ptr); |
417 | #endif |
418 | } |
419 | |
420 | /****************************************************************************/ |
421 | |
422 | static int load_flat_file(struct linux_binprm * bprm, |
423 | struct lib_info *libinfo, int id, unsigned long *extra_stack) |
424 | { |
425 | struct flat_hdr * hdr; |
426 | unsigned long textpos = 0, datapos = 0, result; |
427 | unsigned long realdatastart = 0; |
428 | unsigned long text_len, data_len, bss_len, stack_len, flags; |
429 | unsigned long len, memp = 0; |
430 | unsigned long memp_size, extra, rlim; |
431 | unsigned long *reloc = 0, *rp; |
432 | struct inode *inode; |
433 | int i, rev, relocs = 0; |
434 | loff_t fpos; |
435 | unsigned long start_code, end_code; |
436 | int ret; |
437 | |
438 | hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ |
439 | inode = bprm->file->f_path.dentry->d_inode; |
440 | |
441 | text_len = ntohl(hdr->data_start); |
442 | data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start); |
443 | bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end); |
444 | stack_len = ntohl(hdr->stack_size); |
445 | if (extra_stack) { |
446 | stack_len += *extra_stack; |
447 | *extra_stack = stack_len; |
448 | } |
449 | relocs = ntohl(hdr->reloc_count); |
450 | flags = ntohl(hdr->flags); |
451 | rev = ntohl(hdr->rev); |
452 | |
453 | if (strncmp(hdr->magic, "bFLT", 4)) { |
454 | /* |
455 | * Previously, here was a printk to tell people |
456 | * "BINFMT_FLAT: bad header magic". |
457 | * But for the kernel which also use ELF FD-PIC format, this |
458 | * error message is confusing. |
459 | * because a lot of people do not manage to produce good |
460 | */ |
461 | ret = -ENOEXEC; |
462 | goto err; |
463 | } |
464 | |
465 | if (flags & FLAT_FLAG_KTRACE) |
466 | printk("BINFMT_FLAT: Loading file: %s\n", bprm->filename); |
467 | |
468 | if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) { |
469 | printk("BINFMT_FLAT: bad flat file version 0x%x (supported " |
470 | "0x%lx and 0x%lx)\n", |
471 | rev, FLAT_VERSION, OLD_FLAT_VERSION); |
472 | ret = -ENOEXEC; |
473 | goto err; |
474 | } |
475 | |
476 | /* Don't allow old format executables to use shared libraries */ |
477 | if (rev == OLD_FLAT_VERSION && id != 0) { |
478 | printk("BINFMT_FLAT: shared libraries are not available before rev 0x%x\n", |
479 | (int) FLAT_VERSION); |
480 | ret = -ENOEXEC; |
481 | goto err; |
482 | } |
483 | |
484 | /* |
485 | * fix up the flags for the older format, there were all kinds |
486 | * of endian hacks, this only works for the simple cases |
487 | */ |
488 | if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags)) |
489 | flags = FLAT_FLAG_RAM; |
490 | |
491 | #ifndef CONFIG_BINFMT_ZFLAT |
492 | if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { |
493 | printk("Support for ZFLAT executables is not enabled.\n"); |
494 | ret = -ENOEXEC; |
495 | goto err; |
496 | } |
497 | #endif |
498 | |
499 | /* |
500 | * Check initial limits. This avoids letting people circumvent |
501 | * size limits imposed on them by creating programs with large |
502 | * arrays in the data or bss. |
503 | */ |
504 | rlim = rlimit(RLIMIT_DATA); |
505 | if (rlim >= RLIM_INFINITY) |
506 | rlim = ~0; |
507 | if (data_len + bss_len > rlim) { |
508 | ret = -ENOMEM; |
509 | goto err; |
510 | } |
511 | |
512 | /* Flush all traces of the currently running executable */ |
513 | if (id == 0) { |
514 | result = flush_old_exec(bprm); |
515 | if (result) { |
516 | ret = result; |
517 | goto err; |
518 | } |
519 | |
520 | /* OK, This is the point of no return */ |
521 | set_personality(PER_LINUX_32BIT); |
522 | setup_new_exec(bprm); |
523 | } |
524 | |
525 | /* |
526 | * calculate the extra space we need to map in |
527 | */ |
528 | extra = max_t(unsigned long, bss_len + stack_len, |
529 | 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); |
544 | textpos = do_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, |
545 | MAP_PRIVATE|MAP_EXECUTABLE, 0); |
546 | up_write(¤t->mm->mmap_sem); |
547 | if (!textpos || IS_ERR_VALUE(textpos)) { |
548 | if (!textpos) |
549 | textpos = (unsigned long) -ENOMEM; |
550 | printk("Unable to mmap process text, errno %d\n", (int)-textpos); |
551 | ret = textpos; |
552 | goto err; |
553 | } |
554 | |
555 | len = data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); |
556 | len = PAGE_ALIGN(len); |
557 | down_write(¤t->mm->mmap_sem); |
558 | realdatastart = do_mmap(0, 0, len, |
559 | PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); |
560 | up_write(¤t->mm->mmap_sem); |
561 | |
562 | if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) { |
563 | if (!realdatastart) |
564 | realdatastart = (unsigned long) -ENOMEM; |
565 | printk("Unable to allocate RAM for process data, errno %d\n", |
566 | (int)-realdatastart); |
567 | do_munmap(current->mm, textpos, text_len); |
568 | ret = realdatastart; |
569 | goto err; |
570 | } |
571 | datapos = ALIGN(realdatastart + |
572 | MAX_SHARED_LIBS * sizeof(unsigned long), |
573 | FLAT_DATA_ALIGN); |
574 | |
575 | DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n", |
576 | (int)(data_len + bss_len + stack_len), (int)datapos); |
577 | |
578 | fpos = ntohl(hdr->data_start); |
579 | #ifdef CONFIG_BINFMT_ZFLAT |
580 | if (flags & FLAT_FLAG_GZDATA) { |
581 | result = decompress_exec(bprm, fpos, (char *) datapos, |
582 | data_len + (relocs * sizeof(unsigned long)), 0); |
583 | } else |
584 | #endif |
585 | { |
586 | result = bprm->file->f_op->read(bprm->file, (char *) datapos, |
587 | data_len + (relocs * sizeof(unsigned long)), &fpos); |
588 | } |
589 | if (IS_ERR_VALUE(result)) { |
590 | printk("Unable to read data+bss, errno %d\n", (int)-result); |
591 | do_munmap(current->mm, textpos, text_len); |
592 | do_munmap(current->mm, realdatastart, data_len + extra); |
593 | ret = result; |
594 | goto err; |
595 | } |
596 | |
597 | reloc = (unsigned long *) (datapos+(ntohl(hdr->reloc_start)-text_len)); |
598 | memp = realdatastart; |
599 | memp_size = len; |
600 | } else { |
601 | |
602 | len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); |
603 | len = PAGE_ALIGN(len); |
604 | down_write(¤t->mm->mmap_sem); |
605 | textpos = do_mmap(0, 0, len, |
606 | PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); |
607 | up_write(¤t->mm->mmap_sem); |
608 | |
609 | if (!textpos || IS_ERR_VALUE(textpos)) { |
610 | if (!textpos) |
611 | textpos = (unsigned long) -ENOMEM; |
612 | printk("Unable to allocate RAM for process text/data, errno %d\n", |
613 | (int)-textpos); |
614 | ret = textpos; |
615 | goto err; |
616 | } |
617 | |
618 | realdatastart = textpos + ntohl(hdr->data_start); |
619 | datapos = ALIGN(realdatastart + |
620 | MAX_SHARED_LIBS * sizeof(unsigned long), |
621 | FLAT_DATA_ALIGN); |
622 | |
623 | reloc = (unsigned long *) |
624 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
625 | memp = textpos; |
626 | memp_size = len; |
627 | #ifdef CONFIG_BINFMT_ZFLAT |
628 | /* |
629 | * load it all in and treat it like a RAM load from now on |
630 | */ |
631 | if (flags & FLAT_FLAG_GZIP) { |
632 | result = decompress_exec(bprm, sizeof (struct flat_hdr), |
633 | (((char *) textpos) + sizeof (struct flat_hdr)), |
634 | (text_len + data_len + (relocs * sizeof(unsigned long)) |
635 | - sizeof (struct flat_hdr)), |
636 | 0); |
637 | memmove((void *) datapos, (void *) realdatastart, |
638 | data_len + (relocs * sizeof(unsigned long))); |
639 | } else if (flags & FLAT_FLAG_GZDATA) { |
640 | fpos = 0; |
641 | result = bprm->file->f_op->read(bprm->file, |
642 | (char *) textpos, text_len, &fpos); |
643 | if (!IS_ERR_VALUE(result)) |
644 | result = decompress_exec(bprm, text_len, (char *) datapos, |
645 | data_len + (relocs * sizeof(unsigned long)), 0); |
646 | } |
647 | else |
648 | #endif |
649 | { |
650 | fpos = 0; |
651 | result = bprm->file->f_op->read(bprm->file, |
652 | (char *) textpos, text_len, &fpos); |
653 | if (!IS_ERR_VALUE(result)) { |
654 | fpos = ntohl(hdr->data_start); |
655 | result = bprm->file->f_op->read(bprm->file, (char *) datapos, |
656 | data_len + (relocs * sizeof(unsigned long)), &fpos); |
657 | } |
658 | } |
659 | if (IS_ERR_VALUE(result)) { |
660 | printk("Unable to read code+data+bss, errno %d\n",(int)-result); |
661 | do_munmap(current->mm, textpos, text_len + data_len + extra + |
662 | MAX_SHARED_LIBS * sizeof(unsigned long)); |
663 | ret = result; |
664 | goto err; |
665 | } |
666 | } |
667 | |
668 | if (flags & FLAT_FLAG_KTRACE) |
669 | printk("Mapping is %x, Entry point is %x, data_start is %x\n", |
670 | (int)textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); |
671 | |
672 | /* The main program needs a little extra setup in the task structure */ |
673 | start_code = textpos + sizeof (struct flat_hdr); |
674 | end_code = textpos + text_len; |
675 | if (id == 0) { |
676 | current->mm->start_code = start_code; |
677 | current->mm->end_code = end_code; |
678 | current->mm->start_data = datapos; |
679 | current->mm->end_data = datapos + data_len; |
680 | /* |
681 | * set up the brk stuff, uses any slack left in data/bss/stack |
682 | * allocation. We put the brk after the bss (between the bss |
683 | * and stack) like other platforms. |
684 | * Userspace code relies on the stack pointer starting out at |
685 | * an address right at the end of a page. |
686 | */ |
687 | current->mm->start_brk = datapos + data_len + bss_len; |
688 | current->mm->brk = (current->mm->start_brk + 3) & ~3; |
689 | current->mm->context.end_brk = memp + memp_size - stack_len; |
690 | } |
691 | |
692 | if (flags & FLAT_FLAG_KTRACE) |
693 | printk("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n", |
694 | id ? "Lib" : "Load", bprm->filename, |
695 | (int) start_code, (int) end_code, |
696 | (int) datapos, |
697 | (int) (datapos + data_len), |
698 | (int) (datapos + data_len), |
699 | (int) (((datapos + data_len + bss_len) + 3) & ~3)); |
700 | |
701 | text_len -= sizeof(struct flat_hdr); /* the real code len */ |
702 | |
703 | /* Store the current module values into the global library structure */ |
704 | libinfo->lib_list[id].start_code = start_code; |
705 | libinfo->lib_list[id].start_data = datapos; |
706 | libinfo->lib_list[id].start_brk = datapos + data_len + bss_len; |
707 | libinfo->lib_list[id].text_len = text_len; |
708 | libinfo->lib_list[id].loaded = 1; |
709 | libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; |
710 | libinfo->lib_list[id].build_date = ntohl(hdr->build_date); |
711 | |
712 | /* |
713 | * We just load the allocations into some temporary memory to |
714 | * help simplify all this mumbo jumbo |
715 | * |
716 | * We've got two different sections of relocation entries. |
717 | * The first is the GOT which resides at the begining of the data segment |
718 | * and is terminated with a -1. This one can be relocated in place. |
719 | * The second is the extra relocation entries tacked after the image's |
720 | * data segment. These require a little more processing as the entry is |
721 | * really an offset into the image which contains an offset into the |
722 | * image. |
723 | */ |
724 | if (flags & FLAT_FLAG_GOTPIC) { |
725 | for (rp = (unsigned long *)datapos; *rp != 0xffffffff; rp++) { |
726 | unsigned long addr; |
727 | if (*rp) { |
728 | addr = calc_reloc(*rp, libinfo, id, 0); |
729 | if (addr == RELOC_FAILED) { |
730 | ret = -ENOEXEC; |
731 | goto err; |
732 | } |
733 | *rp = addr; |
734 | } |
735 | } |
736 | } |
737 | |
738 | /* |
739 | * Now run through the relocation entries. |
740 | * We've got to be careful here as C++ produces relocatable zero |
741 | * entries in the constructor and destructor tables which are then |
742 | * tested for being not zero (which will always occur unless we're |
743 | * based from address zero). This causes an endless loop as __start |
744 | * is at zero. The solution used is to not relocate zero addresses. |
745 | * This has the negative side effect of not allowing a global data |
746 | * reference to be statically initialised to _stext (I've moved |
747 | * __start to address 4 so that is okay). |
748 | */ |
749 | if (rev > OLD_FLAT_VERSION) { |
750 | unsigned long persistent = 0; |
751 | for (i=0; i < relocs; i++) { |
752 | unsigned long addr, relval; |
753 | |
754 | /* Get the address of the pointer to be |
755 | relocated (of course, the address has to be |
756 | relocated first). */ |
757 | relval = ntohl(reloc[i]); |
758 | if (flat_set_persistent (relval, &persistent)) |
759 | continue; |
760 | addr = flat_get_relocate_addr(relval); |
761 | rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1); |
762 | if (rp == (unsigned long *)RELOC_FAILED) { |
763 | ret = -ENOEXEC; |
764 | goto err; |
765 | } |
766 | |
767 | /* Get the pointer's value. */ |
768 | addr = flat_get_addr_from_rp(rp, relval, flags, |
769 | &persistent); |
770 | if (addr != 0) { |
771 | /* |
772 | * Do the relocation. PIC relocs in the data section are |
773 | * already in target order |
774 | */ |
775 | if ((flags & FLAT_FLAG_GOTPIC) == 0) |
776 | addr = ntohl(addr); |
777 | addr = calc_reloc(addr, libinfo, id, 0); |
778 | if (addr == RELOC_FAILED) { |
779 | ret = -ENOEXEC; |
780 | goto err; |
781 | } |
782 | |
783 | /* Write back the relocated pointer. */ |
784 | flat_put_addr_at_rp(rp, addr, relval); |
785 | } |
786 | } |
787 | } else { |
788 | for (i=0; i < relocs; i++) |
789 | old_reloc(ntohl(reloc[i])); |
790 | } |
791 | |
792 | flush_icache_range(start_code, end_code); |
793 | |
794 | /* zero the BSS, BRK and stack areas */ |
795 | memset((void*)(datapos + data_len), 0, bss_len + |
796 | (memp + memp_size - stack_len - /* end brk */ |
797 | libinfo->lib_list[id].start_brk) + /* start brk */ |
798 | stack_len); |
799 | |
800 | return 0; |
801 | err: |
802 | return ret; |
803 | } |
804 | |
805 | |
806 | /****************************************************************************/ |
807 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
808 | |
809 | /* |
810 | * Load a shared library into memory. The library gets its own data |
811 | * segment (including bss) but not argv/argc/environ. |
812 | */ |
813 | |
814 | static int load_flat_shared_library(int id, struct lib_info *libs) |
815 | { |
816 | struct linux_binprm bprm; |
817 | int res; |
818 | char buf[16]; |
819 | |
820 | /* Create the file name */ |
821 | sprintf(buf, "/lib/lib%d.so", id); |
822 | |
823 | /* Open the file up */ |
824 | bprm.filename = buf; |
825 | bprm.file = open_exec(bprm.filename); |
826 | res = PTR_ERR(bprm.file); |
827 | if (IS_ERR(bprm.file)) |
828 | return res; |
829 | |
830 | bprm.cred = prepare_exec_creds(); |
831 | res = -ENOMEM; |
832 | if (!bprm.cred) |
833 | goto out; |
834 | |
835 | res = prepare_binprm(&bprm); |
836 | |
837 | if (!IS_ERR_VALUE(res)) |
838 | res = load_flat_file(&bprm, libs, id, NULL); |
839 | |
840 | abort_creds(bprm.cred); |
841 | |
842 | out: |
843 | allow_write_access(bprm.file); |
844 | fput(bprm.file); |
845 | |
846 | return(res); |
847 | } |
848 | |
849 | #endif /* CONFIG_BINFMT_SHARED_FLAT */ |
850 | /****************************************************************************/ |
851 | |
852 | /* |
853 | * These are the functions used to load flat style executables and shared |
854 | * libraries. There is no binary dependent code anywhere else. |
855 | */ |
856 | |
857 | static int load_flat_binary(struct linux_binprm * bprm, struct pt_regs * regs) |
858 | { |
859 | struct lib_info libinfo; |
860 | unsigned long p = bprm->p; |
861 | unsigned long stack_len; |
862 | unsigned long start_addr; |
863 | unsigned long *sp; |
864 | int res; |
865 | int i, j; |
866 | |
867 | memset(&libinfo, 0, sizeof(libinfo)); |
868 | /* |
869 | * We have to add the size of our arguments to our stack size |
870 | * otherwise it's too easy for users to create stack overflows |
871 | * by passing in a huge argument list. And yes, we have to be |
872 | * pedantic and include space for the argv/envp array as it may have |
873 | * a lot of entries. |
874 | */ |
875 | #define TOP_OF_ARGS (PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *)) |
876 | stack_len = TOP_OF_ARGS - bprm->p; /* the strings */ |
877 | stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */ |
878 | stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */ |
879 | stack_len += FLAT_DATA_ALIGN - 1; /* reserve for upcoming alignment */ |
880 | |
881 | res = load_flat_file(bprm, &libinfo, 0, &stack_len); |
882 | if (IS_ERR_VALUE(res)) |
883 | return res; |
884 | |
885 | /* Update data segment pointers for all libraries */ |
886 | for (i=0; i<MAX_SHARED_LIBS; i++) |
887 | if (libinfo.lib_list[i].loaded) |
888 | for (j=0; j<MAX_SHARED_LIBS; j++) |
889 | (-(j+1))[(unsigned long *)(libinfo.lib_list[i].start_data)] = |
890 | (libinfo.lib_list[j].loaded)? |
891 | libinfo.lib_list[j].start_data:UNLOADED_LIB; |
892 | |
893 | install_exec_creds(bprm); |
894 | current->flags &= ~PF_FORKNOEXEC; |
895 | |
896 | set_binfmt(&flat_format); |
897 | |
898 | p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; |
899 | DBG_FLT("p=%x\n", (int)p); |
900 | |
901 | /* copy the arg pages onto the stack, this could be more efficient :-) */ |
902 | for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--) |
903 | * (char *) --p = |
904 | ((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE]; |
905 | |
906 | sp = (unsigned long *) create_flat_tables(p, bprm); |
907 | |
908 | /* Fake some return addresses to ensure the call chain will |
909 | * initialise library in order for us. We are required to call |
910 | * lib 1 first, then 2, ... and finally the main program (id 0). |
911 | */ |
912 | start_addr = libinfo.lib_list[0].entry; |
913 | |
914 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
915 | for (i = MAX_SHARED_LIBS-1; i>0; i--) { |
916 | if (libinfo.lib_list[i].loaded) { |
917 | /* Push previos first to call address */ |
918 | --sp; put_user(start_addr, sp); |
919 | start_addr = libinfo.lib_list[i].entry; |
920 | } |
921 | } |
922 | #endif |
923 | |
924 | /* Stash our initial stack pointer into the mm structure */ |
925 | current->mm->start_stack = (unsigned long )sp; |
926 | |
927 | #ifdef FLAT_PLAT_INIT |
928 | FLAT_PLAT_INIT(regs); |
929 | #endif |
930 | DBG_FLT("start_thread(regs=0x%x, entry=0x%x, start_stack=0x%x)\n", |
931 | (int)regs, (int)start_addr, (int)current->mm->start_stack); |
932 | |
933 | start_thread(regs, start_addr, current->mm->start_stack); |
934 | |
935 | return 0; |
936 | } |
937 | |
938 | /****************************************************************************/ |
939 | |
940 | static int __init init_flat_binfmt(void) |
941 | { |
942 | return register_binfmt(&flat_format); |
943 | } |
944 | |
945 | /****************************************************************************/ |
946 | |
947 | core_initcall(init_flat_binfmt); |
948 | |
949 | /****************************************************************************/ |
950 |
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