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/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 | textpos = vm_mmap(bprm->file, 0, text_len, PROT_READ|PROT_EXEC, |
546 | MAP_PRIVATE|MAP_EXECUTABLE, 0); |
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 | realdatastart = vm_mmap(0, 0, len, |
558 | PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 0); |
559 | |
560 | if (realdatastart == 0 || IS_ERR_VALUE(realdatastart)) { |
561 | if (!realdatastart) |
562 | realdatastart = (unsigned long) -ENOMEM; |
563 | printk("Unable to allocate RAM for process data, errno %d\n", |
564 | (int)-realdatastart); |
565 | vm_munmap(textpos, text_len); |
566 | ret = realdatastart; |
567 | goto err; |
568 | } |
569 | datapos = ALIGN(realdatastart + |
570 | MAX_SHARED_LIBS * sizeof(unsigned long), |
571 | FLAT_DATA_ALIGN); |
572 | |
573 | DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n", |
574 | (int)(data_len + bss_len + stack_len), (int)datapos); |
575 | |
576 | fpos = ntohl(hdr->data_start); |
577 | #ifdef CONFIG_BINFMT_ZFLAT |
578 | if (flags & FLAT_FLAG_GZDATA) { |
579 | result = decompress_exec(bprm, fpos, (char *) datapos, |
580 | data_len + (relocs * sizeof(unsigned long)), 0); |
581 | } else |
582 | #endif |
583 | { |
584 | result = bprm->file->f_op->read(bprm->file, (char *) datapos, |
585 | data_len + (relocs * sizeof(unsigned long)), &fpos); |
586 | } |
587 | if (IS_ERR_VALUE(result)) { |
588 | printk("Unable to read data+bss, errno %d\n", (int)-result); |
589 | vm_munmap(textpos, text_len); |
590 | vm_munmap(realdatastart, len); |
591 | ret = result; |
592 | goto err; |
593 | } |
594 | |
595 | reloc = (unsigned long *) (datapos+(ntohl(hdr->reloc_start)-text_len)); |
596 | memp = realdatastart; |
597 | memp_size = len; |
598 | } else { |
599 | |
600 | len = text_len + data_len + extra + MAX_SHARED_LIBS * sizeof(unsigned long); |
601 | len = PAGE_ALIGN(len); |
602 | textpos = vm_mmap(0, 0, len, |
603 | PROT_READ | PROT_EXEC | PROT_WRITE, MAP_PRIVATE, 0); |
604 | |
605 | if (!textpos || IS_ERR_VALUE(textpos)) { |
606 | if (!textpos) |
607 | textpos = (unsigned long) -ENOMEM; |
608 | printk("Unable to allocate RAM for process text/data, errno %d\n", |
609 | (int)-textpos); |
610 | ret = textpos; |
611 | goto err; |
612 | } |
613 | |
614 | realdatastart = textpos + ntohl(hdr->data_start); |
615 | datapos = ALIGN(realdatastart + |
616 | MAX_SHARED_LIBS * sizeof(unsigned long), |
617 | FLAT_DATA_ALIGN); |
618 | |
619 | reloc = (unsigned long *) |
620 | (datapos + (ntohl(hdr->reloc_start) - text_len)); |
621 | memp = textpos; |
622 | memp_size = len; |
623 | #ifdef CONFIG_BINFMT_ZFLAT |
624 | /* |
625 | * load it all in and treat it like a RAM load from now on |
626 | */ |
627 | if (flags & FLAT_FLAG_GZIP) { |
628 | result = decompress_exec(bprm, sizeof (struct flat_hdr), |
629 | (((char *) textpos) + sizeof (struct flat_hdr)), |
630 | (text_len + data_len + (relocs * sizeof(unsigned long)) |
631 | - sizeof (struct flat_hdr)), |
632 | 0); |
633 | memmove((void *) datapos, (void *) realdatastart, |
634 | data_len + (relocs * sizeof(unsigned long))); |
635 | } else if (flags & FLAT_FLAG_GZDATA) { |
636 | fpos = 0; |
637 | result = bprm->file->f_op->read(bprm->file, |
638 | (char *) textpos, text_len, &fpos); |
639 | if (!IS_ERR_VALUE(result)) |
640 | result = decompress_exec(bprm, text_len, (char *) datapos, |
641 | data_len + (relocs * sizeof(unsigned long)), 0); |
642 | } |
643 | else |
644 | #endif |
645 | { |
646 | fpos = 0; |
647 | result = bprm->file->f_op->read(bprm->file, |
648 | (char *) textpos, text_len, &fpos); |
649 | if (!IS_ERR_VALUE(result)) { |
650 | fpos = ntohl(hdr->data_start); |
651 | result = bprm->file->f_op->read(bprm->file, (char *) datapos, |
652 | data_len + (relocs * sizeof(unsigned long)), &fpos); |
653 | } |
654 | } |
655 | if (IS_ERR_VALUE(result)) { |
656 | printk("Unable to read code+data+bss, errno %d\n",(int)-result); |
657 | vm_munmap(textpos, text_len + data_len + extra + |
658 | MAX_SHARED_LIBS * sizeof(unsigned long)); |
659 | ret = result; |
660 | goto err; |
661 | } |
662 | } |
663 | |
664 | if (flags & FLAT_FLAG_KTRACE) |
665 | printk("Mapping is %x, Entry point is %x, data_start is %x\n", |
666 | (int)textpos, 0x00ffffff&ntohl(hdr->entry), ntohl(hdr->data_start)); |
667 | |
668 | /* The main program needs a little extra setup in the task structure */ |
669 | start_code = textpos + sizeof (struct flat_hdr); |
670 | end_code = textpos + text_len; |
671 | if (id == 0) { |
672 | current->mm->start_code = start_code; |
673 | current->mm->end_code = end_code; |
674 | current->mm->start_data = datapos; |
675 | current->mm->end_data = datapos + data_len; |
676 | /* |
677 | * set up the brk stuff, uses any slack left in data/bss/stack |
678 | * allocation. We put the brk after the bss (between the bss |
679 | * and stack) like other platforms. |
680 | * Userspace code relies on the stack pointer starting out at |
681 | * an address right at the end of a page. |
682 | */ |
683 | current->mm->start_brk = datapos + data_len + bss_len; |
684 | current->mm->brk = (current->mm->start_brk + 3) & ~3; |
685 | current->mm->context.end_brk = memp + memp_size - stack_len; |
686 | } |
687 | |
688 | if (flags & FLAT_FLAG_KTRACE) |
689 | printk("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n", |
690 | id ? "Lib" : "Load", bprm->filename, |
691 | (int) start_code, (int) end_code, |
692 | (int) datapos, |
693 | (int) (datapos + data_len), |
694 | (int) (datapos + data_len), |
695 | (int) (((datapos + data_len + bss_len) + 3) & ~3)); |
696 | |
697 | text_len -= sizeof(struct flat_hdr); /* the real code len */ |
698 | |
699 | /* Store the current module values into the global library structure */ |
700 | libinfo->lib_list[id].start_code = start_code; |
701 | libinfo->lib_list[id].start_data = datapos; |
702 | libinfo->lib_list[id].start_brk = datapos + data_len + bss_len; |
703 | libinfo->lib_list[id].text_len = text_len; |
704 | libinfo->lib_list[id].loaded = 1; |
705 | libinfo->lib_list[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; |
706 | libinfo->lib_list[id].build_date = ntohl(hdr->build_date); |
707 | |
708 | /* |
709 | * We just load the allocations into some temporary memory to |
710 | * help simplify all this mumbo jumbo |
711 | * |
712 | * We've got two different sections of relocation entries. |
713 | * The first is the GOT which resides at the beginning of the data segment |
714 | * and is terminated with a -1. This one can be relocated in place. |
715 | * The second is the extra relocation entries tacked after the image's |
716 | * data segment. These require a little more processing as the entry is |
717 | * really an offset into the image which contains an offset into the |
718 | * image. |
719 | */ |
720 | if (flags & FLAT_FLAG_GOTPIC) { |
721 | for (rp = (unsigned long *)datapos; *rp != 0xffffffff; rp++) { |
722 | unsigned long addr; |
723 | if (*rp) { |
724 | addr = calc_reloc(*rp, libinfo, id, 0); |
725 | if (addr == RELOC_FAILED) { |
726 | ret = -ENOEXEC; |
727 | goto err; |
728 | } |
729 | *rp = addr; |
730 | } |
731 | } |
732 | } |
733 | |
734 | /* |
735 | * Now run through the relocation entries. |
736 | * We've got to be careful here as C++ produces relocatable zero |
737 | * entries in the constructor and destructor tables which are then |
738 | * tested for being not zero (which will always occur unless we're |
739 | * based from address zero). This causes an endless loop as __start |
740 | * is at zero. The solution used is to not relocate zero addresses. |
741 | * This has the negative side effect of not allowing a global data |
742 | * reference to be statically initialised to _stext (I've moved |
743 | * __start to address 4 so that is okay). |
744 | */ |
745 | if (rev > OLD_FLAT_VERSION) { |
746 | unsigned long persistent = 0; |
747 | for (i=0; i < relocs; i++) { |
748 | unsigned long addr, relval; |
749 | |
750 | /* Get the address of the pointer to be |
751 | relocated (of course, the address has to be |
752 | relocated first). */ |
753 | relval = ntohl(reloc[i]); |
754 | if (flat_set_persistent (relval, &persistent)) |
755 | continue; |
756 | addr = flat_get_relocate_addr(relval); |
757 | rp = (unsigned long *) calc_reloc(addr, libinfo, id, 1); |
758 | if (rp == (unsigned long *)RELOC_FAILED) { |
759 | ret = -ENOEXEC; |
760 | goto err; |
761 | } |
762 | |
763 | /* Get the pointer's value. */ |
764 | addr = flat_get_addr_from_rp(rp, relval, flags, |
765 | &persistent); |
766 | if (addr != 0) { |
767 | /* |
768 | * Do the relocation. PIC relocs in the data section are |
769 | * already in target order |
770 | */ |
771 | if ((flags & FLAT_FLAG_GOTPIC) == 0) |
772 | addr = ntohl(addr); |
773 | addr = calc_reloc(addr, libinfo, id, 0); |
774 | if (addr == RELOC_FAILED) { |
775 | ret = -ENOEXEC; |
776 | goto err; |
777 | } |
778 | |
779 | /* Write back the relocated pointer. */ |
780 | flat_put_addr_at_rp(rp, addr, relval); |
781 | } |
782 | } |
783 | } else { |
784 | for (i=0; i < relocs; i++) |
785 | old_reloc(ntohl(reloc[i])); |
786 | } |
787 | |
788 | flush_icache_range(start_code, end_code); |
789 | |
790 | /* zero the BSS, BRK and stack areas */ |
791 | memset((void*)(datapos + data_len), 0, bss_len + |
792 | (memp + memp_size - stack_len - /* end brk */ |
793 | libinfo->lib_list[id].start_brk) + /* start brk */ |
794 | stack_len); |
795 | |
796 | return 0; |
797 | err: |
798 | return ret; |
799 | } |
800 | |
801 | |
802 | /****************************************************************************/ |
803 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
804 | |
805 | /* |
806 | * Load a shared library into memory. The library gets its own data |
807 | * segment (including bss) but not argv/argc/environ. |
808 | */ |
809 | |
810 | static int load_flat_shared_library(int id, struct lib_info *libs) |
811 | { |
812 | struct linux_binprm bprm; |
813 | int res; |
814 | char buf[16]; |
815 | |
816 | memset(&bprm, 0, sizeof(bprm)); |
817 | |
818 | /* Create the file name */ |
819 | sprintf(buf, "/lib/lib%d.so", id); |
820 | |
821 | /* Open the file up */ |
822 | bprm.filename = buf; |
823 | bprm.file = open_exec(bprm.filename); |
824 | res = PTR_ERR(bprm.file); |
825 | if (IS_ERR(bprm.file)) |
826 | return res; |
827 | |
828 | bprm.cred = prepare_exec_creds(); |
829 | res = -ENOMEM; |
830 | if (!bprm.cred) |
831 | goto out; |
832 | |
833 | /* We don't really care about recalculating credentials at this point |
834 | * as we're past the point of no return and are dealing with shared |
835 | * libraries. |
836 | */ |
837 | bprm.cred_prepared = 1; |
838 | |
839 | res = prepare_binprm(&bprm); |
840 | |
841 | if (!IS_ERR_VALUE(res)) |
842 | res = load_flat_file(&bprm, libs, id, NULL); |
843 | |
844 | abort_creds(bprm.cred); |
845 | |
846 | out: |
847 | allow_write_access(bprm.file); |
848 | fput(bprm.file); |
849 | |
850 | return(res); |
851 | } |
852 | |
853 | #endif /* CONFIG_BINFMT_SHARED_FLAT */ |
854 | /****************************************************************************/ |
855 | |
856 | /* |
857 | * These are the functions used to load flat style executables and shared |
858 | * libraries. There is no binary dependent code anywhere else. |
859 | */ |
860 | |
861 | static int load_flat_binary(struct linux_binprm * bprm, struct pt_regs * regs) |
862 | { |
863 | struct lib_info libinfo; |
864 | unsigned long p = bprm->p; |
865 | unsigned long stack_len; |
866 | unsigned long start_addr; |
867 | unsigned long *sp; |
868 | int res; |
869 | int i, j; |
870 | |
871 | memset(&libinfo, 0, sizeof(libinfo)); |
872 | /* |
873 | * We have to add the size of our arguments to our stack size |
874 | * otherwise it's too easy for users to create stack overflows |
875 | * by passing in a huge argument list. And yes, we have to be |
876 | * pedantic and include space for the argv/envp array as it may have |
877 | * a lot of entries. |
878 | */ |
879 | #define TOP_OF_ARGS (PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *)) |
880 | stack_len = TOP_OF_ARGS - bprm->p; /* the strings */ |
881 | stack_len += (bprm->argc + 1) * sizeof(char *); /* the argv array */ |
882 | stack_len += (bprm->envc + 1) * sizeof(char *); /* the envp array */ |
883 | stack_len += FLAT_STACK_ALIGN - 1; /* reserve for upcoming alignment */ |
884 | |
885 | res = load_flat_file(bprm, &libinfo, 0, &stack_len); |
886 | if (IS_ERR_VALUE(res)) |
887 | return res; |
888 | |
889 | /* Update data segment pointers for all libraries */ |
890 | for (i=0; i<MAX_SHARED_LIBS; i++) |
891 | if (libinfo.lib_list[i].loaded) |
892 | for (j=0; j<MAX_SHARED_LIBS; j++) |
893 | (-(j+1))[(unsigned long *)(libinfo.lib_list[i].start_data)] = |
894 | (libinfo.lib_list[j].loaded)? |
895 | libinfo.lib_list[j].start_data:UNLOADED_LIB; |
896 | |
897 | install_exec_creds(bprm); |
898 | |
899 | set_binfmt(&flat_format); |
900 | |
901 | p = ((current->mm->context.end_brk + stack_len + 3) & ~3) - 4; |
902 | DBG_FLT("p=%x\n", (int)p); |
903 | |
904 | /* copy the arg pages onto the stack, this could be more efficient :-) */ |
905 | for (i = TOP_OF_ARGS - 1; i >= bprm->p; i--) |
906 | * (char *) --p = |
907 | ((char *) page_address(bprm->page[i/PAGE_SIZE]))[i % PAGE_SIZE]; |
908 | |
909 | sp = (unsigned long *) create_flat_tables(p, bprm); |
910 | |
911 | /* Fake some return addresses to ensure the call chain will |
912 | * initialise library in order for us. We are required to call |
913 | * lib 1 first, then 2, ... and finally the main program (id 0). |
914 | */ |
915 | start_addr = libinfo.lib_list[0].entry; |
916 | |
917 | #ifdef CONFIG_BINFMT_SHARED_FLAT |
918 | for (i = MAX_SHARED_LIBS-1; i>0; i--) { |
919 | if (libinfo.lib_list[i].loaded) { |
920 | /* Push previos first to call address */ |
921 | --sp; put_user(start_addr, sp); |
922 | start_addr = libinfo.lib_list[i].entry; |
923 | } |
924 | } |
925 | #endif |
926 | |
927 | /* Stash our initial stack pointer into the mm structure */ |
928 | current->mm->start_stack = (unsigned long )sp; |
929 | |
930 | #ifdef FLAT_PLAT_INIT |
931 | FLAT_PLAT_INIT(regs); |
932 | #endif |
933 | DBG_FLT("start_thread(regs=0x%x, entry=0x%x, start_stack=0x%x)\n", |
934 | (int)regs, (int)start_addr, (int)current->mm->start_stack); |
935 | |
936 | start_thread(regs, start_addr, current->mm->start_stack); |
937 | |
938 | return 0; |
939 | } |
940 | |
941 | /****************************************************************************/ |
942 | |
943 | static int __init init_flat_binfmt(void) |
944 | { |
945 | register_binfmt(&flat_format); |
946 | return 0; |
947 | } |
948 | |
949 | /****************************************************************************/ |
950 | |
951 | core_initcall(init_flat_binfmt); |
952 | |
953 | /****************************************************************************/ |
954 |
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