Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/fs/binfmt_elf.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File MIME type: text/plain
File size: 46332 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* |
2 | * linux/fs/binfmt_elf.c |
3 | * |
4 | * These are the functions used to load ELF format executables as used |
5 | * on SVr4 machines. Information on the format may be found in the book |
6 | * "UNIX SYSTEM V RELEASE 4 Programmers Guide: Ansi C and Programming Support |
7 | * Tools". |
8 | * |
9 | * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com). |
10 | */ |
11 | |
12 | #include <linux/module.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/fs.h> |
15 | #include <linux/stat.h> |
16 | #include <linux/time.h> |
17 | #include <linux/mm.h> |
18 | #include <linux/mman.h> |
19 | #include <linux/a.out.h> |
20 | #include <linux/errno.h> |
21 | #include <linux/signal.h> |
22 | #include <linux/binfmts.h> |
23 | #include <linux/string.h> |
24 | #include <linux/file.h> |
25 | #include <linux/fcntl.h> |
26 | #include <linux/ptrace.h> |
27 | #include <linux/slab.h> |
28 | #include <linux/shm.h> |
29 | #include <linux/personality.h> |
30 | #include <linux/elfcore.h> |
31 | #include <linux/init.h> |
32 | #include <linux/highuid.h> |
33 | #include <linux/smp.h> |
34 | #include <linux/smp_lock.h> |
35 | #include <linux/compiler.h> |
36 | #include <linux/highmem.h> |
37 | #include <linux/pagemap.h> |
38 | #include <linux/security.h> |
39 | #include <linux/syscalls.h> |
40 | #include <linux/random.h> |
41 | |
42 | #include <asm/uaccess.h> |
43 | #include <asm/param.h> |
44 | #include <asm/page.h> |
45 | |
46 | #include <linux/elf.h> |
47 | |
48 | static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs); |
49 | static int load_elf_library(struct file*); |
50 | static unsigned long elf_map (struct file *, unsigned long, struct elf_phdr *, int, int); |
51 | extern int dump_fpu (struct pt_regs *, elf_fpregset_t *); |
52 | |
53 | #ifndef elf_addr_t |
54 | #define elf_addr_t unsigned long |
55 | #endif |
56 | |
57 | /* |
58 | * If we don't support core dumping, then supply a NULL so we |
59 | * don't even try. |
60 | */ |
61 | #ifdef USE_ELF_CORE_DUMP |
62 | static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file); |
63 | #else |
64 | #define elf_core_dump NULL |
65 | #endif |
66 | |
67 | #if ELF_EXEC_PAGESIZE > PAGE_SIZE |
68 | # define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE |
69 | #else |
70 | # define ELF_MIN_ALIGN PAGE_SIZE |
71 | #endif |
72 | |
73 | #ifndef ELF_CORE_EFLAGS |
74 | #define ELF_CORE_EFLAGS 0 |
75 | #endif |
76 | |
77 | #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1)) |
78 | #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1)) |
79 | #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1)) |
80 | |
81 | static struct linux_binfmt elf_format = { |
82 | .module = THIS_MODULE, |
83 | .load_binary = load_elf_binary, |
84 | .load_shlib = load_elf_library, |
85 | .core_dump = elf_core_dump, |
86 | .min_coredump = ELF_EXEC_PAGESIZE |
87 | }; |
88 | |
89 | #define BAD_ADDR(x) ((unsigned long)(x) > TASK_SIZE) |
90 | |
91 | static int set_brk(unsigned long start, unsigned long end) |
92 | { |
93 | start = ELF_PAGEALIGN(start); |
94 | end = ELF_PAGEALIGN(end); |
95 | if (end > start) { |
96 | unsigned long addr; |
97 | down_write(¤t->mm->mmap_sem); |
98 | addr = do_brk(start, end - start); |
99 | up_write(¤t->mm->mmap_sem); |
100 | if (BAD_ADDR(addr)) |
101 | return addr; |
102 | } |
103 | current->mm->start_brk = current->mm->brk = end; |
104 | return 0; |
105 | } |
106 | |
107 | |
108 | /* We need to explicitly zero any fractional pages |
109 | after the data section (i.e. bss). This would |
110 | contain the junk from the file that should not |
111 | be in memory */ |
112 | |
113 | |
114 | static int padzero(unsigned long elf_bss) |
115 | { |
116 | unsigned long nbyte; |
117 | |
118 | nbyte = ELF_PAGEOFFSET(elf_bss); |
119 | if (nbyte) { |
120 | nbyte = ELF_MIN_ALIGN - nbyte; |
121 | if (clear_user((void __user *) elf_bss, nbyte)) |
122 | return -EFAULT; |
123 | } |
124 | return 0; |
125 | } |
126 | |
127 | /* Let's use some macros to make this stack manipulation a litle clearer */ |
128 | #ifdef CONFIG_STACK_GROWSUP |
129 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items)) |
130 | #define STACK_ROUND(sp, items) \ |
131 | ((15 + (unsigned long) ((sp) + (items))) &~ 15UL) |
132 | #define STACK_ALLOC(sp, len) ({ elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; old_sp; }) |
133 | #else |
134 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items)) |
135 | #define STACK_ROUND(sp, items) \ |
136 | (((unsigned long) (sp - items)) &~ 15UL) |
137 | #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; }) |
138 | #endif |
139 | |
140 | static int |
141 | create_elf_tables(struct linux_binprm *bprm, struct elfhdr * exec, |
142 | int interp_aout, unsigned long load_addr, |
143 | unsigned long interp_load_addr) |
144 | { |
145 | unsigned long p = bprm->p; |
146 | int argc = bprm->argc; |
147 | int envc = bprm->envc; |
148 | elf_addr_t __user *argv; |
149 | elf_addr_t __user *envp; |
150 | elf_addr_t __user *sp; |
151 | elf_addr_t __user *u_platform; |
152 | const char *k_platform = ELF_PLATFORM; |
153 | int items; |
154 | elf_addr_t *elf_info; |
155 | int ei_index = 0; |
156 | struct task_struct *tsk = current; |
157 | |
158 | /* |
159 | * If this architecture has a platform capability string, copy it |
160 | * to userspace. In some cases (Sparc), this info is impossible |
161 | * for userspace to get any other way, in others (i386) it is |
162 | * merely difficult. |
163 | */ |
164 | |
165 | u_platform = NULL; |
166 | if (k_platform) { |
167 | size_t len = strlen(k_platform) + 1; |
168 | |
169 | /* |
170 | * In some cases (e.g. Hyper-Threading), we want to avoid L1 |
171 | * evictions by the processes running on the same package. One |
172 | * thing we can do is to shuffle the initial stack for them. |
173 | */ |
174 | |
175 | p = arch_align_stack(p); |
176 | |
177 | u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); |
178 | if (__copy_to_user(u_platform, k_platform, len)) |
179 | return -EFAULT; |
180 | } |
181 | |
182 | /* Create the ELF interpreter info */ |
183 | elf_info = (elf_addr_t *) current->mm->saved_auxv; |
184 | #define NEW_AUX_ENT(id, val) \ |
185 | do { elf_info[ei_index++] = id; elf_info[ei_index++] = val; } while (0) |
186 | |
187 | #ifdef ARCH_DLINFO |
188 | /* |
189 | * ARCH_DLINFO must come first so PPC can do its special alignment of |
190 | * AUXV. |
191 | */ |
192 | ARCH_DLINFO; |
193 | #endif |
194 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); |
195 | NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE); |
196 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); |
197 | NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff); |
198 | NEW_AUX_ENT(AT_PHENT, sizeof (struct elf_phdr)); |
199 | NEW_AUX_ENT(AT_PHNUM, exec->e_phnum); |
200 | NEW_AUX_ENT(AT_BASE, interp_load_addr); |
201 | NEW_AUX_ENT(AT_FLAGS, 0); |
202 | NEW_AUX_ENT(AT_ENTRY, exec->e_entry); |
203 | NEW_AUX_ENT(AT_UID, (elf_addr_t) tsk->uid); |
204 | NEW_AUX_ENT(AT_EUID, (elf_addr_t) tsk->euid); |
205 | NEW_AUX_ENT(AT_GID, (elf_addr_t) tsk->gid); |
206 | NEW_AUX_ENT(AT_EGID, (elf_addr_t) tsk->egid); |
207 | NEW_AUX_ENT(AT_SECURE, (elf_addr_t) security_bprm_secureexec(bprm)); |
208 | if (k_platform) { |
209 | NEW_AUX_ENT(AT_PLATFORM, (elf_addr_t)(unsigned long)u_platform); |
210 | } |
211 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
212 | NEW_AUX_ENT(AT_EXECFD, (elf_addr_t) bprm->interp_data); |
213 | } |
214 | #undef NEW_AUX_ENT |
215 | /* AT_NULL is zero; clear the rest too */ |
216 | memset(&elf_info[ei_index], 0, |
217 | sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]); |
218 | |
219 | /* And advance past the AT_NULL entry. */ |
220 | ei_index += 2; |
221 | |
222 | sp = STACK_ADD(p, ei_index); |
223 | |
224 | items = (argc + 1) + (envc + 1); |
225 | if (interp_aout) { |
226 | items += 3; /* a.out interpreters require argv & envp too */ |
227 | } else { |
228 | items += 1; /* ELF interpreters only put argc on the stack */ |
229 | } |
230 | bprm->p = STACK_ROUND(sp, items); |
231 | |
232 | /* Point sp at the lowest address on the stack */ |
233 | #ifdef CONFIG_STACK_GROWSUP |
234 | sp = (elf_addr_t __user *)bprm->p - items - ei_index; |
235 | bprm->exec = (unsigned long) sp; /* XXX: PARISC HACK */ |
236 | #else |
237 | sp = (elf_addr_t __user *)bprm->p; |
238 | #endif |
239 | |
240 | /* Now, let's put argc (and argv, envp if appropriate) on the stack */ |
241 | if (__put_user(argc, sp++)) |
242 | return -EFAULT; |
243 | if (interp_aout) { |
244 | argv = sp + 2; |
245 | envp = argv + argc + 1; |
246 | __put_user((elf_addr_t)(unsigned long)argv, sp++); |
247 | __put_user((elf_addr_t)(unsigned long)envp, sp++); |
248 | } else { |
249 | argv = sp; |
250 | envp = argv + argc + 1; |
251 | } |
252 | |
253 | /* Populate argv and envp */ |
254 | p = current->mm->arg_end = current->mm->arg_start; |
255 | while (argc-- > 0) { |
256 | size_t len; |
257 | __put_user((elf_addr_t)p, argv++); |
258 | len = strnlen_user((void __user *)p, PAGE_SIZE*MAX_ARG_PAGES); |
259 | if (!len || len > PAGE_SIZE*MAX_ARG_PAGES) |
260 | return 0; |
261 | p += len; |
262 | } |
263 | if (__put_user(0, argv)) |
264 | return -EFAULT; |
265 | current->mm->arg_end = current->mm->env_start = p; |
266 | while (envc-- > 0) { |
267 | size_t len; |
268 | __put_user((elf_addr_t)p, envp++); |
269 | len = strnlen_user((void __user *)p, PAGE_SIZE*MAX_ARG_PAGES); |
270 | if (!len || len > PAGE_SIZE*MAX_ARG_PAGES) |
271 | return 0; |
272 | p += len; |
273 | } |
274 | if (__put_user(0, envp)) |
275 | return -EFAULT; |
276 | current->mm->env_end = p; |
277 | |
278 | /* Put the elf_info on the stack in the right place. */ |
279 | sp = (elf_addr_t __user *)envp + 1; |
280 | if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t))) |
281 | return -EFAULT; |
282 | return 0; |
283 | } |
284 | |
285 | #ifndef elf_map |
286 | |
287 | static unsigned long elf_map(struct file *filep, unsigned long addr, |
288 | struct elf_phdr *eppnt, int prot, int type) |
289 | { |
290 | unsigned long map_addr; |
291 | |
292 | down_write(¤t->mm->mmap_sem); |
293 | map_addr = do_mmap(filep, ELF_PAGESTART(addr), |
294 | eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr), prot, type, |
295 | eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr)); |
296 | up_write(¤t->mm->mmap_sem); |
297 | return(map_addr); |
298 | } |
299 | |
300 | #endif /* !elf_map */ |
301 | |
302 | /* This is much more generalized than the library routine read function, |
303 | so we keep this separate. Technically the library read function |
304 | is only provided so that we can read a.out libraries that have |
305 | an ELF header */ |
306 | |
307 | static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex, |
308 | struct file * interpreter, |
309 | unsigned long *interp_load_addr) |
310 | { |
311 | struct elf_phdr *elf_phdata; |
312 | struct elf_phdr *eppnt; |
313 | unsigned long load_addr = 0; |
314 | int load_addr_set = 0; |
315 | unsigned long last_bss = 0, elf_bss = 0; |
316 | unsigned long error = ~0UL; |
317 | int retval, i, size; |
318 | |
319 | /* First of all, some simple consistency checks */ |
320 | if (interp_elf_ex->e_type != ET_EXEC && |
321 | interp_elf_ex->e_type != ET_DYN) |
322 | goto out; |
323 | if (!elf_check_arch(interp_elf_ex)) |
324 | goto out; |
325 | if (!interpreter->f_op || !interpreter->f_op->mmap) |
326 | goto out; |
327 | |
328 | /* |
329 | * If the size of this structure has changed, then punt, since |
330 | * we will be doing the wrong thing. |
331 | */ |
332 | if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) |
333 | goto out; |
334 | if (interp_elf_ex->e_phnum < 1 || |
335 | interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr)) |
336 | goto out; |
337 | |
338 | /* Now read in all of the header information */ |
339 | |
340 | size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum; |
341 | if (size > ELF_MIN_ALIGN) |
342 | goto out; |
343 | elf_phdata = (struct elf_phdr *) kmalloc(size, GFP_KERNEL); |
344 | if (!elf_phdata) |
345 | goto out; |
346 | |
347 | retval = kernel_read(interpreter,interp_elf_ex->e_phoff,(char *)elf_phdata,size); |
348 | error = -EIO; |
349 | if (retval != size) { |
350 | if (retval < 0) |
351 | error = retval; |
352 | goto out_close; |
353 | } |
354 | |
355 | eppnt = elf_phdata; |
356 | for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) { |
357 | if (eppnt->p_type == PT_LOAD) { |
358 | int elf_type = MAP_PRIVATE | MAP_DENYWRITE; |
359 | int elf_prot = 0; |
360 | unsigned long vaddr = 0; |
361 | unsigned long k, map_addr; |
362 | |
363 | if (eppnt->p_flags & PF_R) elf_prot = PROT_READ; |
364 | if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; |
365 | if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; |
366 | vaddr = eppnt->p_vaddr; |
367 | if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) |
368 | elf_type |= MAP_FIXED; |
369 | |
370 | map_addr = elf_map(interpreter, load_addr + vaddr, eppnt, elf_prot, elf_type); |
371 | error = map_addr; |
372 | if (BAD_ADDR(map_addr)) |
373 | goto out_close; |
374 | |
375 | if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) { |
376 | load_addr = map_addr - ELF_PAGESTART(vaddr); |
377 | load_addr_set = 1; |
378 | } |
379 | |
380 | /* |
381 | * Check to see if the section's size will overflow the |
382 | * allowed task size. Note that p_filesz must always be |
383 | * <= p_memsize so it is only necessary to check p_memsz. |
384 | */ |
385 | k = load_addr + eppnt->p_vaddr; |
386 | if (k > TASK_SIZE || eppnt->p_filesz > eppnt->p_memsz || |
387 | eppnt->p_memsz > TASK_SIZE || TASK_SIZE - eppnt->p_memsz < k) { |
388 | error = -ENOMEM; |
389 | goto out_close; |
390 | } |
391 | |
392 | /* |
393 | * Find the end of the file mapping for this phdr, and keep |
394 | * track of the largest address we see for this. |
395 | */ |
396 | k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; |
397 | if (k > elf_bss) |
398 | elf_bss = k; |
399 | |
400 | /* |
401 | * Do the same thing for the memory mapping - between |
402 | * elf_bss and last_bss is the bss section. |
403 | */ |
404 | k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; |
405 | if (k > last_bss) |
406 | last_bss = k; |
407 | } |
408 | } |
409 | |
410 | /* |
411 | * Now fill out the bss section. First pad the last page up |
412 | * to the page boundary, and then perform a mmap to make sure |
413 | * that there are zero-mapped pages up to and including the |
414 | * last bss page. |
415 | */ |
416 | if (padzero(elf_bss)) { |
417 | error = -EFAULT; |
418 | goto out_close; |
419 | } |
420 | |
421 | elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1); /* What we have mapped so far */ |
422 | |
423 | /* Map the last of the bss segment */ |
424 | if (last_bss > elf_bss) { |
425 | down_write(¤t->mm->mmap_sem); |
426 | error = do_brk(elf_bss, last_bss - elf_bss); |
427 | up_write(¤t->mm->mmap_sem); |
428 | if (BAD_ADDR(error)) |
429 | goto out_close; |
430 | } |
431 | |
432 | *interp_load_addr = load_addr; |
433 | error = ((unsigned long) interp_elf_ex->e_entry) + load_addr; |
434 | |
435 | out_close: |
436 | kfree(elf_phdata); |
437 | out: |
438 | return error; |
439 | } |
440 | |
441 | static unsigned long load_aout_interp(struct exec * interp_ex, |
442 | struct file * interpreter) |
443 | { |
444 | unsigned long text_data, elf_entry = ~0UL; |
445 | char __user * addr; |
446 | loff_t offset; |
447 | |
448 | current->mm->end_code = interp_ex->a_text; |
449 | text_data = interp_ex->a_text + interp_ex->a_data; |
450 | current->mm->end_data = text_data; |
451 | current->mm->brk = interp_ex->a_bss + text_data; |
452 | |
453 | switch (N_MAGIC(*interp_ex)) { |
454 | case OMAGIC: |
455 | offset = 32; |
456 | addr = (char __user *)0; |
457 | break; |
458 | case ZMAGIC: |
459 | case QMAGIC: |
460 | offset = N_TXTOFF(*interp_ex); |
461 | addr = (char __user *) N_TXTADDR(*interp_ex); |
462 | break; |
463 | default: |
464 | goto out; |
465 | } |
466 | |
467 | down_write(¤t->mm->mmap_sem); |
468 | do_brk(0, text_data); |
469 | up_write(¤t->mm->mmap_sem); |
470 | if (!interpreter->f_op || !interpreter->f_op->read) |
471 | goto out; |
472 | if (interpreter->f_op->read(interpreter, addr, text_data, &offset) < 0) |
473 | goto out; |
474 | flush_icache_range((unsigned long)addr, |
475 | (unsigned long)addr + text_data); |
476 | |
477 | |
478 | down_write(¤t->mm->mmap_sem); |
479 | do_brk(ELF_PAGESTART(text_data + ELF_MIN_ALIGN - 1), |
480 | interp_ex->a_bss); |
481 | up_write(¤t->mm->mmap_sem); |
482 | elf_entry = interp_ex->a_entry; |
483 | |
484 | out: |
485 | return elf_entry; |
486 | } |
487 | |
488 | /* |
489 | * These are the functions used to load ELF style executables and shared |
490 | * libraries. There is no binary dependent code anywhere else. |
491 | */ |
492 | |
493 | #define INTERPRETER_NONE 0 |
494 | #define INTERPRETER_AOUT 1 |
495 | #define INTERPRETER_ELF 2 |
496 | |
497 | |
498 | static unsigned long randomize_stack_top(unsigned long stack_top) |
499 | { |
500 | unsigned int random_variable = 0; |
501 | |
502 | if (current->flags & PF_RANDOMIZE) |
503 | random_variable = get_random_int() % (8*1024*1024); |
504 | #ifdef CONFIG_STACK_GROWSUP |
505 | return PAGE_ALIGN(stack_top + random_variable); |
506 | #else |
507 | return PAGE_ALIGN(stack_top - random_variable); |
508 | #endif |
509 | } |
510 | |
511 | static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs) |
512 | { |
513 | struct file *interpreter = NULL; /* to shut gcc up */ |
514 | unsigned long load_addr = 0, load_bias = 0; |
515 | int load_addr_set = 0; |
516 | char * elf_interpreter = NULL; |
517 | unsigned int interpreter_type = INTERPRETER_NONE; |
518 | unsigned char ibcs2_interpreter = 0; |
519 | unsigned long error; |
520 | struct elf_phdr * elf_ppnt, *elf_phdata; |
521 | unsigned long elf_bss, elf_brk; |
522 | int elf_exec_fileno; |
523 | int retval, i; |
524 | unsigned int size; |
525 | unsigned long elf_entry, interp_load_addr = 0; |
526 | unsigned long start_code, end_code, start_data, end_data; |
527 | unsigned long reloc_func_desc = 0; |
528 | char passed_fileno[6]; |
529 | struct files_struct *files; |
530 | int have_pt_gnu_stack, executable_stack = EXSTACK_DEFAULT; |
531 | unsigned long def_flags = 0; |
532 | struct { |
533 | struct elfhdr elf_ex; |
534 | struct elfhdr interp_elf_ex; |
535 | struct exec interp_ex; |
536 | } *loc; |
537 | |
538 | loc = kmalloc(sizeof(*loc), GFP_KERNEL); |
539 | if (!loc) { |
540 | retval = -ENOMEM; |
541 | goto out_ret; |
542 | } |
543 | |
544 | /* Get the exec-header */ |
545 | loc->elf_ex = *((struct elfhdr *) bprm->buf); |
546 | |
547 | retval = -ENOEXEC; |
548 | /* First of all, some simple consistency checks */ |
549 | if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0) |
550 | goto out; |
551 | |
552 | if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN) |
553 | goto out; |
554 | if (!elf_check_arch(&loc->elf_ex)) |
555 | goto out; |
556 | if (!bprm->file->f_op||!bprm->file->f_op->mmap) |
557 | goto out; |
558 | |
559 | /* Now read in all of the header information */ |
560 | |
561 | if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr)) |
562 | goto out; |
563 | if (loc->elf_ex.e_phnum < 1 || |
564 | loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr)) |
565 | goto out; |
566 | size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr); |
567 | retval = -ENOMEM; |
568 | elf_phdata = (struct elf_phdr *) kmalloc(size, GFP_KERNEL); |
569 | if (!elf_phdata) |
570 | goto out; |
571 | |
572 | retval = kernel_read(bprm->file, loc->elf_ex.e_phoff, (char *) elf_phdata, size); |
573 | if (retval != size) { |
574 | if (retval >= 0) |
575 | retval = -EIO; |
576 | goto out_free_ph; |
577 | } |
578 | |
579 | files = current->files; /* Refcounted so ok */ |
580 | retval = unshare_files(); |
581 | if (retval < 0) |
582 | goto out_free_ph; |
583 | if (files == current->files) { |
584 | put_files_struct(files); |
585 | files = NULL; |
586 | } |
587 | |
588 | /* exec will make our files private anyway, but for the a.out |
589 | loader stuff we need to do it earlier */ |
590 | |
591 | retval = get_unused_fd(); |
592 | if (retval < 0) |
593 | goto out_free_fh; |
594 | get_file(bprm->file); |
595 | fd_install(elf_exec_fileno = retval, bprm->file); |
596 | |
597 | elf_ppnt = elf_phdata; |
598 | elf_bss = 0; |
599 | elf_brk = 0; |
600 | |
601 | start_code = ~0UL; |
602 | end_code = 0; |
603 | start_data = 0; |
604 | end_data = 0; |
605 | |
606 | for (i = 0; i < loc->elf_ex.e_phnum; i++) { |
607 | if (elf_ppnt->p_type == PT_INTERP) { |
608 | /* This is the program interpreter used for |
609 | * shared libraries - for now assume that this |
610 | * is an a.out format binary |
611 | */ |
612 | |
613 | retval = -ENOEXEC; |
614 | if (elf_ppnt->p_filesz > PATH_MAX || |
615 | elf_ppnt->p_filesz < 2) |
616 | goto out_free_file; |
617 | |
618 | retval = -ENOMEM; |
619 | elf_interpreter = (char *) kmalloc(elf_ppnt->p_filesz, |
620 | GFP_KERNEL); |
621 | if (!elf_interpreter) |
622 | goto out_free_file; |
623 | |
624 | retval = kernel_read(bprm->file, elf_ppnt->p_offset, |
625 | elf_interpreter, |
626 | elf_ppnt->p_filesz); |
627 | if (retval != elf_ppnt->p_filesz) { |
628 | if (retval >= 0) |
629 | retval = -EIO; |
630 | goto out_free_interp; |
631 | } |
632 | /* make sure path is NULL terminated */ |
633 | retval = -ENOEXEC; |
634 | if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0') |
635 | goto out_free_interp; |
636 | |
637 | /* If the program interpreter is one of these two, |
638 | * then assume an iBCS2 image. Otherwise assume |
639 | * a native linux image. |
640 | */ |
641 | if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 || |
642 | strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) |
643 | ibcs2_interpreter = 1; |
644 | |
645 | /* |
646 | * The early SET_PERSONALITY here is so that the lookup |
647 | * for the interpreter happens in the namespace of the |
648 | * to-be-execed image. SET_PERSONALITY can select an |
649 | * alternate root. |
650 | * |
651 | * However, SET_PERSONALITY is NOT allowed to switch |
652 | * this task into the new images's memory mapping |
653 | * policy - that is, TASK_SIZE must still evaluate to |
654 | * that which is appropriate to the execing application. |
655 | * This is because exit_mmap() needs to have TASK_SIZE |
656 | * evaluate to the size of the old image. |
657 | * |
658 | * So if (say) a 64-bit application is execing a 32-bit |
659 | * application it is the architecture's responsibility |
660 | * to defer changing the value of TASK_SIZE until the |
661 | * switch really is going to happen - do this in |
662 | * flush_thread(). - akpm |
663 | */ |
664 | SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter); |
665 | |
666 | interpreter = open_exec(elf_interpreter); |
667 | retval = PTR_ERR(interpreter); |
668 | if (IS_ERR(interpreter)) |
669 | goto out_free_interp; |
670 | retval = kernel_read(interpreter, 0, bprm->buf, BINPRM_BUF_SIZE); |
671 | if (retval != BINPRM_BUF_SIZE) { |
672 | if (retval >= 0) |
673 | retval = -EIO; |
674 | goto out_free_dentry; |
675 | } |
676 | |
677 | /* Get the exec headers */ |
678 | loc->interp_ex = *((struct exec *) bprm->buf); |
679 | loc->interp_elf_ex = *((struct elfhdr *) bprm->buf); |
680 | break; |
681 | } |
682 | elf_ppnt++; |
683 | } |
684 | |
685 | elf_ppnt = elf_phdata; |
686 | for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) |
687 | if (elf_ppnt->p_type == PT_GNU_STACK) { |
688 | if (elf_ppnt->p_flags & PF_X) |
689 | executable_stack = EXSTACK_ENABLE_X; |
690 | else |
691 | executable_stack = EXSTACK_DISABLE_X; |
692 | break; |
693 | } |
694 | have_pt_gnu_stack = (i < loc->elf_ex.e_phnum); |
695 | |
696 | /* Some simple consistency checks for the interpreter */ |
697 | if (elf_interpreter) { |
698 | interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT; |
699 | |
700 | /* Now figure out which format our binary is */ |
701 | if ((N_MAGIC(loc->interp_ex) != OMAGIC) && |
702 | (N_MAGIC(loc->interp_ex) != ZMAGIC) && |
703 | (N_MAGIC(loc->interp_ex) != QMAGIC)) |
704 | interpreter_type = INTERPRETER_ELF; |
705 | |
706 | if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0) |
707 | interpreter_type &= ~INTERPRETER_ELF; |
708 | |
709 | retval = -ELIBBAD; |
710 | if (!interpreter_type) |
711 | goto out_free_dentry; |
712 | |
713 | /* Make sure only one type was selected */ |
714 | if ((interpreter_type & INTERPRETER_ELF) && |
715 | interpreter_type != INTERPRETER_ELF) { |
716 | // FIXME - ratelimit this before re-enabling |
717 | // printk(KERN_WARNING "ELF: Ambiguous type, using ELF\n"); |
718 | interpreter_type = INTERPRETER_ELF; |
719 | } |
720 | /* Verify the interpreter has a valid arch */ |
721 | if ((interpreter_type == INTERPRETER_ELF) && |
722 | !elf_check_arch(&loc->interp_elf_ex)) |
723 | goto out_free_dentry; |
724 | } else { |
725 | /* Executables without an interpreter also need a personality */ |
726 | SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter); |
727 | } |
728 | |
729 | /* OK, we are done with that, now set up the arg stuff, |
730 | and then start this sucker up */ |
731 | |
732 | if ((!bprm->sh_bang) && (interpreter_type == INTERPRETER_AOUT)) { |
733 | char *passed_p = passed_fileno; |
734 | sprintf(passed_fileno, "%d", elf_exec_fileno); |
735 | |
736 | if (elf_interpreter) { |
737 | retval = copy_strings_kernel(1, &passed_p, bprm); |
738 | if (retval) |
739 | goto out_free_dentry; |
740 | bprm->argc++; |
741 | } |
742 | } |
743 | |
744 | /* Flush all traces of the currently running executable */ |
745 | retval = flush_old_exec(bprm); |
746 | if (retval) |
747 | goto out_free_dentry; |
748 | |
749 | /* Discard our unneeded old files struct */ |
750 | if (files) { |
751 | steal_locks(files); |
752 | put_files_struct(files); |
753 | files = NULL; |
754 | } |
755 | |
756 | /* OK, This is the point of no return */ |
757 | current->mm->start_data = 0; |
758 | current->mm->end_data = 0; |
759 | current->mm->end_code = 0; |
760 | current->mm->mmap = NULL; |
761 | current->flags &= ~PF_FORKNOEXEC; |
762 | current->mm->def_flags = def_flags; |
763 | |
764 | /* Do this immediately, since STACK_TOP as used in setup_arg_pages |
765 | may depend on the personality. */ |
766 | SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter); |
767 | if (elf_read_implies_exec(loc->elf_ex, executable_stack)) |
768 | current->personality |= READ_IMPLIES_EXEC; |
769 | |
770 | if ( !(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
771 | current->flags |= PF_RANDOMIZE; |
772 | arch_pick_mmap_layout(current->mm); |
773 | |
774 | /* Do this so that we can load the interpreter, if need be. We will |
775 | change some of these later */ |
776 | set_mm_counter(current->mm, rss, 0); |
777 | current->mm->free_area_cache = current->mm->mmap_base; |
778 | retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP), |
779 | executable_stack); |
780 | if (retval < 0) { |
781 | send_sig(SIGKILL, current, 0); |
782 | goto out_free_dentry; |
783 | } |
784 | |
785 | current->mm->start_stack = bprm->p; |
786 | |
787 | /* Now we do a little grungy work by mmaping the ELF image into |
788 | the correct location in memory. At this point, we assume that |
789 | the image should be loaded at fixed address, not at a variable |
790 | address. */ |
791 | |
792 | for(i = 0, elf_ppnt = elf_phdata; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) { |
793 | int elf_prot = 0, elf_flags; |
794 | unsigned long k, vaddr; |
795 | |
796 | if (elf_ppnt->p_type != PT_LOAD) |
797 | continue; |
798 | |
799 | if (unlikely (elf_brk > elf_bss)) { |
800 | unsigned long nbyte; |
801 | |
802 | /* There was a PT_LOAD segment with p_memsz > p_filesz |
803 | before this one. Map anonymous pages, if needed, |
804 | and clear the area. */ |
805 | retval = set_brk (elf_bss + load_bias, |
806 | elf_brk + load_bias); |
807 | if (retval) { |
808 | send_sig(SIGKILL, current, 0); |
809 | goto out_free_dentry; |
810 | } |
811 | nbyte = ELF_PAGEOFFSET(elf_bss); |
812 | if (nbyte) { |
813 | nbyte = ELF_MIN_ALIGN - nbyte; |
814 | if (nbyte > elf_brk - elf_bss) |
815 | nbyte = elf_brk - elf_bss; |
816 | if (clear_user((void __user *)elf_bss + |
817 | load_bias, nbyte)) { |
818 | /* |
819 | * This bss-zeroing can fail if the ELF |
820 | * file specifies odd protections. So |
821 | * we don't check the return value |
822 | */ |
823 | } |
824 | } |
825 | } |
826 | |
827 | if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ; |
828 | if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; |
829 | if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; |
830 | |
831 | elf_flags = MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE; |
832 | |
833 | vaddr = elf_ppnt->p_vaddr; |
834 | if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) { |
835 | elf_flags |= MAP_FIXED; |
836 | } else if (loc->elf_ex.e_type == ET_DYN) { |
837 | /* Try and get dynamic programs out of the way of the default mmap |
838 | base, as well as whatever program they might try to exec. This |
839 | is because the brk will follow the loader, and is not movable. */ |
840 | load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); |
841 | } |
842 | |
843 | error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, elf_prot, elf_flags); |
844 | if (BAD_ADDR(error)) { |
845 | send_sig(SIGKILL, current, 0); |
846 | goto out_free_dentry; |
847 | } |
848 | |
849 | if (!load_addr_set) { |
850 | load_addr_set = 1; |
851 | load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset); |
852 | if (loc->elf_ex.e_type == ET_DYN) { |
853 | load_bias += error - |
854 | ELF_PAGESTART(load_bias + vaddr); |
855 | load_addr += load_bias; |
856 | reloc_func_desc = load_bias; |
857 | } |
858 | } |
859 | k = elf_ppnt->p_vaddr; |
860 | if (k < start_code) start_code = k; |
861 | if (start_data < k) start_data = k; |
862 | |
863 | /* |
864 | * Check to see if the section's size will overflow the |
865 | * allowed task size. Note that p_filesz must always be |
866 | * <= p_memsz so it is only necessary to check p_memsz. |
867 | */ |
868 | if (k > TASK_SIZE || elf_ppnt->p_filesz > elf_ppnt->p_memsz || |
869 | elf_ppnt->p_memsz > TASK_SIZE || |
870 | TASK_SIZE - elf_ppnt->p_memsz < k) { |
871 | /* set_brk can never work. Avoid overflows. */ |
872 | send_sig(SIGKILL, current, 0); |
873 | goto out_free_dentry; |
874 | } |
875 | |
876 | k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; |
877 | |
878 | if (k > elf_bss) |
879 | elf_bss = k; |
880 | if ((elf_ppnt->p_flags & PF_X) && end_code < k) |
881 | end_code = k; |
882 | if (end_data < k) |
883 | end_data = k; |
884 | k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; |
885 | if (k > elf_brk) |
886 | elf_brk = k; |
887 | } |
888 | |
889 | loc->elf_ex.e_entry += load_bias; |
890 | elf_bss += load_bias; |
891 | elf_brk += load_bias; |
892 | start_code += load_bias; |
893 | end_code += load_bias; |
894 | start_data += load_bias; |
895 | end_data += load_bias; |
896 | |
897 | /* Calling set_brk effectively mmaps the pages that we need |
898 | * for the bss and break sections. We must do this before |
899 | * mapping in the interpreter, to make sure it doesn't wind |
900 | * up getting placed where the bss needs to go. |
901 | */ |
902 | retval = set_brk(elf_bss, elf_brk); |
903 | if (retval) { |
904 | send_sig(SIGKILL, current, 0); |
905 | goto out_free_dentry; |
906 | } |
907 | if (padzero(elf_bss)) { |
908 | send_sig(SIGSEGV, current, 0); |
909 | retval = -EFAULT; /* Nobody gets to see this, but.. */ |
910 | goto out_free_dentry; |
911 | } |
912 | |
913 | if (elf_interpreter) { |
914 | if (interpreter_type == INTERPRETER_AOUT) |
915 | elf_entry = load_aout_interp(&loc->interp_ex, |
916 | interpreter); |
917 | else |
918 | elf_entry = load_elf_interp(&loc->interp_elf_ex, |
919 | interpreter, |
920 | &interp_load_addr); |
921 | if (BAD_ADDR(elf_entry)) { |
922 | printk(KERN_ERR "Unable to load interpreter %.128s\n", |
923 | elf_interpreter); |
924 | force_sig(SIGSEGV, current); |
925 | retval = -ENOEXEC; /* Nobody gets to see this, but.. */ |
926 | goto out_free_dentry; |
927 | } |
928 | reloc_func_desc = interp_load_addr; |
929 | |
930 | allow_write_access(interpreter); |
931 | fput(interpreter); |
932 | kfree(elf_interpreter); |
933 | } else { |
934 | elf_entry = loc->elf_ex.e_entry; |
935 | } |
936 | |
937 | kfree(elf_phdata); |
938 | |
939 | if (interpreter_type != INTERPRETER_AOUT) |
940 | sys_close(elf_exec_fileno); |
941 | |
942 | set_binfmt(&elf_format); |
943 | |
944 | #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
945 | retval = arch_setup_additional_pages(bprm, executable_stack); |
946 | if (retval < 0) { |
947 | send_sig(SIGKILL, current, 0); |
948 | goto out; |
949 | } |
950 | #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */ |
951 | |
952 | compute_creds(bprm); |
953 | current->flags &= ~PF_FORKNOEXEC; |
954 | create_elf_tables(bprm, &loc->elf_ex, (interpreter_type == INTERPRETER_AOUT), |
955 | load_addr, interp_load_addr); |
956 | /* N.B. passed_fileno might not be initialized? */ |
957 | if (interpreter_type == INTERPRETER_AOUT) |
958 | current->mm->arg_start += strlen(passed_fileno) + 1; |
959 | current->mm->end_code = end_code; |
960 | current->mm->start_code = start_code; |
961 | current->mm->start_data = start_data; |
962 | current->mm->end_data = end_data; |
963 | current->mm->start_stack = bprm->p; |
964 | |
965 | if (current->personality & MMAP_PAGE_ZERO) { |
966 | /* Why this, you ask??? Well SVr4 maps page 0 as read-only, |
967 | and some applications "depend" upon this behavior. |
968 | Since we do not have the power to recompile these, we |
969 | emulate the SVr4 behavior. Sigh. */ |
970 | down_write(¤t->mm->mmap_sem); |
971 | error = do_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC, |
972 | MAP_FIXED | MAP_PRIVATE, 0); |
973 | up_write(¤t->mm->mmap_sem); |
974 | } |
975 | |
976 | #ifdef ELF_PLAT_INIT |
977 | /* |
978 | * The ABI may specify that certain registers be set up in special |
979 | * ways (on i386 %edx is the address of a DT_FINI function, for |
980 | * example. In addition, it may also specify (eg, PowerPC64 ELF) |
981 | * that the e_entry field is the address of the function descriptor |
982 | * for the startup routine, rather than the address of the startup |
983 | * routine itself. This macro performs whatever initialization to |
984 | * the regs structure is required as well as any relocations to the |
985 | * function descriptor entries when executing dynamically links apps. |
986 | */ |
987 | ELF_PLAT_INIT(regs, reloc_func_desc); |
988 | #endif |
989 | |
990 | start_thread(regs, elf_entry, bprm->p); |
991 | if (unlikely(current->ptrace & PT_PTRACED)) { |
992 | if (current->ptrace & PT_TRACE_EXEC) |
993 | ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP); |
994 | else |
995 | send_sig(SIGTRAP, current, 0); |
996 | } |
997 | retval = 0; |
998 | out: |
999 | kfree(loc); |
1000 | out_ret: |
1001 | return retval; |
1002 | |
1003 | /* error cleanup */ |
1004 | out_free_dentry: |
1005 | allow_write_access(interpreter); |
1006 | if (interpreter) |
1007 | fput(interpreter); |
1008 | out_free_interp: |
1009 | if (elf_interpreter) |
1010 | kfree(elf_interpreter); |
1011 | out_free_file: |
1012 | sys_close(elf_exec_fileno); |
1013 | out_free_fh: |
1014 | if (files) { |
1015 | put_files_struct(current->files); |
1016 | current->files = files; |
1017 | } |
1018 | out_free_ph: |
1019 | kfree(elf_phdata); |
1020 | goto out; |
1021 | } |
1022 | |
1023 | /* This is really simpleminded and specialized - we are loading an |
1024 | a.out library that is given an ELF header. */ |
1025 | |
1026 | static int load_elf_library(struct file *file) |
1027 | { |
1028 | struct elf_phdr *elf_phdata; |
1029 | struct elf_phdr *eppnt; |
1030 | unsigned long elf_bss, bss, len; |
1031 | int retval, error, i, j; |
1032 | struct elfhdr elf_ex; |
1033 | |
1034 | error = -ENOEXEC; |
1035 | retval = kernel_read(file, 0, (char *) &elf_ex, sizeof(elf_ex)); |
1036 | if (retval != sizeof(elf_ex)) |
1037 | goto out; |
1038 | |
1039 | if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0) |
1040 | goto out; |
1041 | |
1042 | /* First of all, some simple consistency checks */ |
1043 | if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 || |
1044 | !elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap) |
1045 | goto out; |
1046 | |
1047 | /* Now read in all of the header information */ |
1048 | |
1049 | j = sizeof(struct elf_phdr) * elf_ex.e_phnum; |
1050 | /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */ |
1051 | |
1052 | error = -ENOMEM; |
1053 | elf_phdata = kmalloc(j, GFP_KERNEL); |
1054 | if (!elf_phdata) |
1055 | goto out; |
1056 | |
1057 | eppnt = elf_phdata; |
1058 | error = -ENOEXEC; |
1059 | retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j); |
1060 | if (retval != j) |
1061 | goto out_free_ph; |
1062 | |
1063 | for (j = 0, i = 0; i<elf_ex.e_phnum; i++) |
1064 | if ((eppnt + i)->p_type == PT_LOAD) |
1065 | j++; |
1066 | if (j != 1) |
1067 | goto out_free_ph; |
1068 | |
1069 | while (eppnt->p_type != PT_LOAD) |
1070 | eppnt++; |
1071 | |
1072 | /* Now use mmap to map the library into memory. */ |
1073 | down_write(¤t->mm->mmap_sem); |
1074 | error = do_mmap(file, |
1075 | ELF_PAGESTART(eppnt->p_vaddr), |
1076 | (eppnt->p_filesz + |
1077 | ELF_PAGEOFFSET(eppnt->p_vaddr)), |
1078 | PROT_READ | PROT_WRITE | PROT_EXEC, |
1079 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, |
1080 | (eppnt->p_offset - |
1081 | ELF_PAGEOFFSET(eppnt->p_vaddr))); |
1082 | up_write(¤t->mm->mmap_sem); |
1083 | if (error != ELF_PAGESTART(eppnt->p_vaddr)) |
1084 | goto out_free_ph; |
1085 | |
1086 | elf_bss = eppnt->p_vaddr + eppnt->p_filesz; |
1087 | if (padzero(elf_bss)) { |
1088 | error = -EFAULT; |
1089 | goto out_free_ph; |
1090 | } |
1091 | |
1092 | len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + ELF_MIN_ALIGN - 1); |
1093 | bss = eppnt->p_memsz + eppnt->p_vaddr; |
1094 | if (bss > len) { |
1095 | down_write(¤t->mm->mmap_sem); |
1096 | do_brk(len, bss - len); |
1097 | up_write(¤t->mm->mmap_sem); |
1098 | } |
1099 | error = 0; |
1100 | |
1101 | out_free_ph: |
1102 | kfree(elf_phdata); |
1103 | out: |
1104 | return error; |
1105 | } |
1106 | |
1107 | /* |
1108 | * Note that some platforms still use traditional core dumps and not |
1109 | * the ELF core dump. Each platform can select it as appropriate. |
1110 | */ |
1111 | #ifdef USE_ELF_CORE_DUMP |
1112 | |
1113 | /* |
1114 | * ELF core dumper |
1115 | * |
1116 | * Modelled on fs/exec.c:aout_core_dump() |
1117 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> |
1118 | */ |
1119 | /* |
1120 | * These are the only things you should do on a core-file: use only these |
1121 | * functions to write out all the necessary info. |
1122 | */ |
1123 | static int dump_write(struct file *file, const void *addr, int nr) |
1124 | { |
1125 | return file->f_op->write(file, addr, nr, &file->f_pos) == nr; |
1126 | } |
1127 | |
1128 | static int dump_seek(struct file *file, loff_t off) |
1129 | { |
1130 | if (file->f_op->llseek) { |
1131 | if (file->f_op->llseek(file, off, 0) != off) |
1132 | return 0; |
1133 | } else |
1134 | file->f_pos = off; |
1135 | return 1; |
1136 | } |
1137 | |
1138 | /* |
1139 | * Decide whether a segment is worth dumping; default is yes to be |
1140 | * sure (missing info is worse than too much; etc). |
1141 | * Personally I'd include everything, and use the coredump limit... |
1142 | * |
1143 | * I think we should skip something. But I am not sure how. H.J. |
1144 | */ |
1145 | static int maydump(struct vm_area_struct *vma) |
1146 | { |
1147 | /* Do not dump I/O mapped devices or special mappings */ |
1148 | if (vma->vm_flags & (VM_IO | VM_RESERVED)) |
1149 | return 0; |
1150 | |
1151 | /* Dump shared memory only if mapped from an anonymous file. */ |
1152 | if (vma->vm_flags & VM_SHARED) |
1153 | return vma->vm_file->f_dentry->d_inode->i_nlink == 0; |
1154 | |
1155 | /* If it hasn't been written to, don't write it out */ |
1156 | if (!vma->anon_vma) |
1157 | return 0; |
1158 | |
1159 | return 1; |
1160 | } |
1161 | |
1162 | #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) |
1163 | |
1164 | /* An ELF note in memory */ |
1165 | struct memelfnote |
1166 | { |
1167 | const char *name; |
1168 | int type; |
1169 | unsigned int datasz; |
1170 | void *data; |
1171 | }; |
1172 | |
1173 | static int notesize(struct memelfnote *en) |
1174 | { |
1175 | int sz; |
1176 | |
1177 | sz = sizeof(struct elf_note); |
1178 | sz += roundup(strlen(en->name) + 1, 4); |
1179 | sz += roundup(en->datasz, 4); |
1180 | |
1181 | return sz; |
1182 | } |
1183 | |
1184 | #define DUMP_WRITE(addr, nr) \ |
1185 | do { if (!dump_write(file, (addr), (nr))) return 0; } while(0) |
1186 | #define DUMP_SEEK(off) \ |
1187 | do { if (!dump_seek(file, (off))) return 0; } while(0) |
1188 | |
1189 | static int writenote(struct memelfnote *men, struct file *file) |
1190 | { |
1191 | struct elf_note en; |
1192 | |
1193 | en.n_namesz = strlen(men->name) + 1; |
1194 | en.n_descsz = men->datasz; |
1195 | en.n_type = men->type; |
1196 | |
1197 | DUMP_WRITE(&en, sizeof(en)); |
1198 | DUMP_WRITE(men->name, en.n_namesz); |
1199 | /* XXX - cast from long long to long to avoid need for libgcc.a */ |
1200 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ |
1201 | DUMP_WRITE(men->data, men->datasz); |
1202 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ |
1203 | |
1204 | return 1; |
1205 | } |
1206 | #undef DUMP_WRITE |
1207 | #undef DUMP_SEEK |
1208 | |
1209 | #define DUMP_WRITE(addr, nr) \ |
1210 | if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \ |
1211 | goto end_coredump; |
1212 | #define DUMP_SEEK(off) \ |
1213 | if (!dump_seek(file, (off))) \ |
1214 | goto end_coredump; |
1215 | |
1216 | static inline void fill_elf_header(struct elfhdr *elf, int segs) |
1217 | { |
1218 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
1219 | elf->e_ident[EI_CLASS] = ELF_CLASS; |
1220 | elf->e_ident[EI_DATA] = ELF_DATA; |
1221 | elf->e_ident[EI_VERSION] = EV_CURRENT; |
1222 | elf->e_ident[EI_OSABI] = ELF_OSABI; |
1223 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); |
1224 | |
1225 | elf->e_type = ET_CORE; |
1226 | elf->e_machine = ELF_ARCH; |
1227 | elf->e_version = EV_CURRENT; |
1228 | elf->e_entry = 0; |
1229 | elf->e_phoff = sizeof(struct elfhdr); |
1230 | elf->e_shoff = 0; |
1231 | elf->e_flags = ELF_CORE_EFLAGS; |
1232 | elf->e_ehsize = sizeof(struct elfhdr); |
1233 | elf->e_phentsize = sizeof(struct elf_phdr); |
1234 | elf->e_phnum = segs; |
1235 | elf->e_shentsize = 0; |
1236 | elf->e_shnum = 0; |
1237 | elf->e_shstrndx = 0; |
1238 | return; |
1239 | } |
1240 | |
1241 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, off_t offset) |
1242 | { |
1243 | phdr->p_type = PT_NOTE; |
1244 | phdr->p_offset = offset; |
1245 | phdr->p_vaddr = 0; |
1246 | phdr->p_paddr = 0; |
1247 | phdr->p_filesz = sz; |
1248 | phdr->p_memsz = 0; |
1249 | phdr->p_flags = 0; |
1250 | phdr->p_align = 0; |
1251 | return; |
1252 | } |
1253 | |
1254 | static void fill_note(struct memelfnote *note, const char *name, int type, |
1255 | unsigned int sz, void *data) |
1256 | { |
1257 | note->name = name; |
1258 | note->type = type; |
1259 | note->datasz = sz; |
1260 | note->data = data; |
1261 | return; |
1262 | } |
1263 | |
1264 | /* |
1265 | * fill up all the fields in prstatus from the given task struct, except registers |
1266 | * which need to be filled up separately. |
1267 | */ |
1268 | static void fill_prstatus(struct elf_prstatus *prstatus, |
1269 | struct task_struct *p, long signr) |
1270 | { |
1271 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; |
1272 | prstatus->pr_sigpend = p->pending.signal.sig[0]; |
1273 | prstatus->pr_sighold = p->blocked.sig[0]; |
1274 | prstatus->pr_pid = p->pid; |
1275 | prstatus->pr_ppid = p->parent->pid; |
1276 | prstatus->pr_pgrp = process_group(p); |
1277 | prstatus->pr_sid = p->signal->session; |
1278 | if (thread_group_leader(p)) { |
1279 | /* |
1280 | * This is the record for the group leader. Add in the |
1281 | * cumulative times of previous dead threads. This total |
1282 | * won't include the time of each live thread whose state |
1283 | * is included in the core dump. The final total reported |
1284 | * to our parent process when it calls wait4 will include |
1285 | * those sums as well as the little bit more time it takes |
1286 | * this and each other thread to finish dying after the |
1287 | * core dump synchronization phase. |
1288 | */ |
1289 | cputime_to_timeval(cputime_add(p->utime, p->signal->utime), |
1290 | &prstatus->pr_utime); |
1291 | cputime_to_timeval(cputime_add(p->stime, p->signal->stime), |
1292 | &prstatus->pr_stime); |
1293 | } else { |
1294 | cputime_to_timeval(p->utime, &prstatus->pr_utime); |
1295 | cputime_to_timeval(p->stime, &prstatus->pr_stime); |
1296 | } |
1297 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); |
1298 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); |
1299 | } |
1300 | |
1301 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, |
1302 | struct mm_struct *mm) |
1303 | { |
1304 | unsigned int i, len; |
1305 | |
1306 | /* first copy the parameters from user space */ |
1307 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); |
1308 | |
1309 | len = mm->arg_end - mm->arg_start; |
1310 | if (len >= ELF_PRARGSZ) |
1311 | len = ELF_PRARGSZ-1; |
1312 | if (copy_from_user(&psinfo->pr_psargs, |
1313 | (const char __user *)mm->arg_start, len)) |
1314 | return -EFAULT; |
1315 | for(i = 0; i < len; i++) |
1316 | if (psinfo->pr_psargs[i] == 0) |
1317 | psinfo->pr_psargs[i] = ' '; |
1318 | psinfo->pr_psargs[len] = 0; |
1319 | |
1320 | psinfo->pr_pid = p->pid; |
1321 | psinfo->pr_ppid = p->parent->pid; |
1322 | psinfo->pr_pgrp = process_group(p); |
1323 | psinfo->pr_sid = p->signal->session; |
1324 | |
1325 | i = p->state ? ffz(~p->state) + 1 : 0; |
1326 | psinfo->pr_state = i; |
1327 | psinfo->pr_sname = (i < 0 || i > 5) ? '.' : "RSDTZW"[i]; |
1328 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
1329 | psinfo->pr_nice = task_nice(p); |
1330 | psinfo->pr_flag = p->flags; |
1331 | SET_UID(psinfo->pr_uid, p->uid); |
1332 | SET_GID(psinfo->pr_gid, p->gid); |
1333 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1334 | |
1335 | return 0; |
1336 | } |
1337 | |
1338 | /* Here is the structure in which status of each thread is captured. */ |
1339 | struct elf_thread_status |
1340 | { |
1341 | struct list_head list; |
1342 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ |
1343 | elf_fpregset_t fpu; /* NT_PRFPREG */ |
1344 | struct task_struct *thread; |
1345 | #ifdef ELF_CORE_COPY_XFPREGS |
1346 | elf_fpxregset_t xfpu; /* NT_PRXFPREG */ |
1347 | #endif |
1348 | struct memelfnote notes[3]; |
1349 | int num_notes; |
1350 | }; |
1351 | |
1352 | /* |
1353 | * In order to add the specific thread information for the elf file format, |
1354 | * we need to keep a linked list of every threads pr_status and then |
1355 | * create a single section for them in the final core file. |
1356 | */ |
1357 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) |
1358 | { |
1359 | int sz = 0; |
1360 | struct task_struct *p = t->thread; |
1361 | t->num_notes = 0; |
1362 | |
1363 | fill_prstatus(&t->prstatus, p, signr); |
1364 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); |
1365 | |
1366 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), &(t->prstatus)); |
1367 | t->num_notes++; |
1368 | sz += notesize(&t->notes[0]); |
1369 | |
1370 | if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu))) { |
1371 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), &(t->fpu)); |
1372 | t->num_notes++; |
1373 | sz += notesize(&t->notes[1]); |
1374 | } |
1375 | |
1376 | #ifdef ELF_CORE_COPY_XFPREGS |
1377 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { |
1378 | fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu), &t->xfpu); |
1379 | t->num_notes++; |
1380 | sz += notesize(&t->notes[2]); |
1381 | } |
1382 | #endif |
1383 | return sz; |
1384 | } |
1385 | |
1386 | /* |
1387 | * Actual dumper |
1388 | * |
1389 | * This is a two-pass process; first we find the offsets of the bits, |
1390 | * and then they are actually written out. If we run out of core limit |
1391 | * we just truncate. |
1392 | */ |
1393 | static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file) |
1394 | { |
1395 | #define NUM_NOTES 6 |
1396 | int has_dumped = 0; |
1397 | mm_segment_t fs; |
1398 | int segs; |
1399 | size_t size = 0; |
1400 | int i; |
1401 | struct vm_area_struct *vma; |
1402 | struct elfhdr *elf = NULL; |
1403 | off_t offset = 0, dataoff; |
1404 | unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur; |
1405 | int numnote; |
1406 | struct memelfnote *notes = NULL; |
1407 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ |
1408 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ |
1409 | struct task_struct *g, *p; |
1410 | LIST_HEAD(thread_list); |
1411 | struct list_head *t; |
1412 | elf_fpregset_t *fpu = NULL; |
1413 | #ifdef ELF_CORE_COPY_XFPREGS |
1414 | elf_fpxregset_t *xfpu = NULL; |
1415 | #endif |
1416 | int thread_status_size = 0; |
1417 | elf_addr_t *auxv; |
1418 | |
1419 | /* |
1420 | * We no longer stop all VM operations. |
1421 | * |
1422 | * This is because those proceses that could possibly change map_count or |
1423 | * the mmap / vma pages are now blocked in do_exit on current finishing |
1424 | * this core dump. |
1425 | * |
1426 | * Only ptrace can touch these memory addresses, but it doesn't change |
1427 | * the map_count or the pages allocated. So no possibility of crashing |
1428 | * exists while dumping the mm->vm_next areas to the core file. |
1429 | */ |
1430 | |
1431 | /* alloc memory for large data structures: too large to be on stack */ |
1432 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); |
1433 | if (!elf) |
1434 | goto cleanup; |
1435 | prstatus = kmalloc(sizeof(*prstatus), GFP_KERNEL); |
1436 | if (!prstatus) |
1437 | goto cleanup; |
1438 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); |
1439 | if (!psinfo) |
1440 | goto cleanup; |
1441 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); |
1442 | if (!notes) |
1443 | goto cleanup; |
1444 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); |
1445 | if (!fpu) |
1446 | goto cleanup; |
1447 | #ifdef ELF_CORE_COPY_XFPREGS |
1448 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); |
1449 | if (!xfpu) |
1450 | goto cleanup; |
1451 | #endif |
1452 | |
1453 | if (signr) { |
1454 | struct elf_thread_status *tmp; |
1455 | read_lock(&tasklist_lock); |
1456 | do_each_thread(g,p) |
1457 | if (current->mm == p->mm && current != p) { |
1458 | tmp = kmalloc(sizeof(*tmp), GFP_ATOMIC); |
1459 | if (!tmp) { |
1460 | read_unlock(&tasklist_lock); |
1461 | goto cleanup; |
1462 | } |
1463 | memset(tmp, 0, sizeof(*tmp)); |
1464 | INIT_LIST_HEAD(&tmp->list); |
1465 | tmp->thread = p; |
1466 | list_add(&tmp->list, &thread_list); |
1467 | } |
1468 | while_each_thread(g,p); |
1469 | read_unlock(&tasklist_lock); |
1470 | list_for_each(t, &thread_list) { |
1471 | struct elf_thread_status *tmp; |
1472 | int sz; |
1473 | |
1474 | tmp = list_entry(t, struct elf_thread_status, list); |
1475 | sz = elf_dump_thread_status(signr, tmp); |
1476 | thread_status_size += sz; |
1477 | } |
1478 | } |
1479 | /* now collect the dump for the current */ |
1480 | memset(prstatus, 0, sizeof(*prstatus)); |
1481 | fill_prstatus(prstatus, current, signr); |
1482 | elf_core_copy_regs(&prstatus->pr_reg, regs); |
1483 | |
1484 | segs = current->mm->map_count; |
1485 | #ifdef ELF_CORE_EXTRA_PHDRS |
1486 | segs += ELF_CORE_EXTRA_PHDRS; |
1487 | #endif |
1488 | |
1489 | /* Set up header */ |
1490 | fill_elf_header(elf, segs+1); /* including notes section */ |
1491 | |
1492 | has_dumped = 1; |
1493 | current->flags |= PF_DUMPCORE; |
1494 | |
1495 | /* |
1496 | * Set up the notes in similar form to SVR4 core dumps made |
1497 | * with info from their /proc. |
1498 | */ |
1499 | |
1500 | fill_note(notes +0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); |
1501 | |
1502 | fill_psinfo(psinfo, current->group_leader, current->mm); |
1503 | fill_note(notes +1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
1504 | |
1505 | fill_note(notes +2, "CORE", NT_TASKSTRUCT, sizeof(*current), current); |
1506 | |
1507 | numnote = 3; |
1508 | |
1509 | auxv = (elf_addr_t *) current->mm->saved_auxv; |
1510 | |
1511 | i = 0; |
1512 | do |
1513 | i += 2; |
1514 | while (auxv[i - 2] != AT_NULL); |
1515 | fill_note(¬es[numnote++], "CORE", NT_AUXV, |
1516 | i * sizeof (elf_addr_t), auxv); |
1517 | |
1518 | /* Try to dump the FPU. */ |
1519 | if ((prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs, fpu))) |
1520 | fill_note(notes + numnote++, |
1521 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); |
1522 | #ifdef ELF_CORE_COPY_XFPREGS |
1523 | if (elf_core_copy_task_xfpregs(current, xfpu)) |
1524 | fill_note(notes + numnote++, |
1525 | "LINUX", NT_PRXFPREG, sizeof(*xfpu), xfpu); |
1526 | #endif |
1527 | |
1528 | fs = get_fs(); |
1529 | set_fs(KERNEL_DS); |
1530 | |
1531 | DUMP_WRITE(elf, sizeof(*elf)); |
1532 | offset += sizeof(*elf); /* Elf header */ |
1533 | offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */ |
1534 | |
1535 | /* Write notes phdr entry */ |
1536 | { |
1537 | struct elf_phdr phdr; |
1538 | int sz = 0; |
1539 | |
1540 | for (i = 0; i < numnote; i++) |
1541 | sz += notesize(notes + i); |
1542 | |
1543 | sz += thread_status_size; |
1544 | |
1545 | fill_elf_note_phdr(&phdr, sz, offset); |
1546 | offset += sz; |
1547 | DUMP_WRITE(&phdr, sizeof(phdr)); |
1548 | } |
1549 | |
1550 | /* Page-align dumped data */ |
1551 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
1552 | |
1553 | /* Write program headers for segments dump */ |
1554 | for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) { |
1555 | struct elf_phdr phdr; |
1556 | size_t sz; |
1557 | |
1558 | sz = vma->vm_end - vma->vm_start; |
1559 | |
1560 | phdr.p_type = PT_LOAD; |
1561 | phdr.p_offset = offset; |
1562 | phdr.p_vaddr = vma->vm_start; |
1563 | phdr.p_paddr = 0; |
1564 | phdr.p_filesz = maydump(vma) ? sz : 0; |
1565 | phdr.p_memsz = sz; |
1566 | offset += phdr.p_filesz; |
1567 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; |
1568 | if (vma->vm_flags & VM_WRITE) phdr.p_flags |= PF_W; |
1569 | if (vma->vm_flags & VM_EXEC) phdr.p_flags |= PF_X; |
1570 | phdr.p_align = ELF_EXEC_PAGESIZE; |
1571 | |
1572 | DUMP_WRITE(&phdr, sizeof(phdr)); |
1573 | } |
1574 | |
1575 | #ifdef ELF_CORE_WRITE_EXTRA_PHDRS |
1576 | ELF_CORE_WRITE_EXTRA_PHDRS; |
1577 | #endif |
1578 | |
1579 | /* write out the notes section */ |
1580 | for (i = 0; i < numnote; i++) |
1581 | if (!writenote(notes + i, file)) |
1582 | goto end_coredump; |
1583 | |
1584 | /* write out the thread status notes section */ |
1585 | list_for_each(t, &thread_list) { |
1586 | struct elf_thread_status *tmp = list_entry(t, struct elf_thread_status, list); |
1587 | for (i = 0; i < tmp->num_notes; i++) |
1588 | if (!writenote(&tmp->notes[i], file)) |
1589 | goto end_coredump; |
1590 | } |
1591 | |
1592 | DUMP_SEEK(dataoff); |
1593 | |
1594 | for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) { |
1595 | unsigned long addr; |
1596 | |
1597 | if (!maydump(vma)) |
1598 | continue; |
1599 | |
1600 | for (addr = vma->vm_start; |
1601 | addr < vma->vm_end; |
1602 | addr += PAGE_SIZE) { |
1603 | struct page* page; |
1604 | struct vm_area_struct *vma; |
1605 | |
1606 | if (get_user_pages(current, current->mm, addr, 1, 0, 1, |
1607 | &page, &vma) <= 0) { |
1608 | DUMP_SEEK (file->f_pos + PAGE_SIZE); |
1609 | } else { |
1610 | if (page == ZERO_PAGE(addr)) { |
1611 | DUMP_SEEK (file->f_pos + PAGE_SIZE); |
1612 | } else { |
1613 | void *kaddr; |
1614 | flush_cache_page(vma, addr, page_to_pfn(page)); |
1615 | kaddr = kmap(page); |
1616 | if ((size += PAGE_SIZE) > limit || |
1617 | !dump_write(file, kaddr, |
1618 | PAGE_SIZE)) { |
1619 | kunmap(page); |
1620 | page_cache_release(page); |
1621 | goto end_coredump; |
1622 | } |
1623 | kunmap(page); |
1624 | } |
1625 | page_cache_release(page); |
1626 | } |
1627 | } |
1628 | } |
1629 | |
1630 | #ifdef ELF_CORE_WRITE_EXTRA_DATA |
1631 | ELF_CORE_WRITE_EXTRA_DATA; |
1632 | #endif |
1633 | |
1634 | if ((off_t) file->f_pos != offset) { |
1635 | /* Sanity check */ |
1636 | printk("elf_core_dump: file->f_pos (%ld) != offset (%ld)\n", |
1637 | (off_t) file->f_pos, offset); |
1638 | } |
1639 | |
1640 | end_coredump: |
1641 | set_fs(fs); |
1642 | |
1643 | cleanup: |
1644 | while(!list_empty(&thread_list)) { |
1645 | struct list_head *tmp = thread_list.next; |
1646 | list_del(tmp); |
1647 | kfree(list_entry(tmp, struct elf_thread_status, list)); |
1648 | } |
1649 | |
1650 | kfree(elf); |
1651 | kfree(prstatus); |
1652 | kfree(psinfo); |
1653 | kfree(notes); |
1654 | kfree(fpu); |
1655 | #ifdef ELF_CORE_COPY_XFPREGS |
1656 | kfree(xfpu); |
1657 | #endif |
1658 | return has_dumped; |
1659 | #undef NUM_NOTES |
1660 | } |
1661 | |
1662 | #endif /* USE_ELF_CORE_DUMP */ |
1663 | |
1664 | static int __init init_elf_binfmt(void) |
1665 | { |
1666 | return register_binfmt(&elf_format); |
1667 | } |
1668 | |
1669 | static void __exit exit_elf_binfmt(void) |
1670 | { |
1671 | /* Remove the COFF and ELF loaders. */ |
1672 | unregister_binfmt(&elf_format); |
1673 | } |
1674 | |
1675 | core_initcall(init_elf_binfmt); |
1676 | module_exit(exit_elf_binfmt); |
1677 | MODULE_LICENSE("GPL"); |