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