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12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/fs.h>
15#include <linux/mm.h>
16#include <linux/mman.h>
17#include <linux/errno.h>
18#include <linux/signal.h>
19#include <linux/binfmts.h>
20#include <linux/string.h>
21#include <linux/file.h>
22#include <linux/slab.h>
23#include <linux/personality.h>
24#include <linux/elfcore.h>
25#include <linux/init.h>
26#include <linux/highuid.h>
27#include <linux/compiler.h>
28#include <linux/highmem.h>
29#include <linux/pagemap.h>
30#include <linux/vmalloc.h>
31#include <linux/security.h>
32#include <linux/random.h>
33#include <linux/elf.h>
34#include <linux/utsname.h>
35#include <linux/coredump.h>
36#include <linux/sched.h>
37#include <asm/uaccess.h>
38#include <asm/param.h>
39#include <asm/page.h>
40
41#ifndef user_long_t
42#define user_long_t long
43#endif
44#ifndef user_siginfo_t
45#define user_siginfo_t siginfo_t
46#endif
47
48static int load_elf_binary(struct linux_binprm *bprm);
49static int load_elf_library(struct file *);
50static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *,
51 int, int, unsigned long);
52
53
54
55
56
57#ifdef CONFIG_ELF_CORE
58static int elf_core_dump(struct coredump_params *cprm);
59#else
60#define elf_core_dump NULL
61#endif
62
63#if ELF_EXEC_PAGESIZE > PAGE_SIZE
64#define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE
65#else
66#define ELF_MIN_ALIGN PAGE_SIZE
67#endif
68
69#ifndef ELF_CORE_EFLAGS
70#define ELF_CORE_EFLAGS 0
71#endif
72
73#define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
74#define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
75#define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
76
77static struct linux_binfmt elf_format = {
78 .module = THIS_MODULE,
79 .load_binary = load_elf_binary,
80 .load_shlib = load_elf_library,
81 .core_dump = elf_core_dump,
82 .min_coredump = ELF_EXEC_PAGESIZE,
83};
84
85#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
86
87static int set_brk(unsigned long start, unsigned long end)
88{
89 start = ELF_PAGEALIGN(start);
90 end = ELF_PAGEALIGN(end);
91 if (end > start) {
92 unsigned long addr;
93 addr = vm_brk(start, end - start);
94 if (BAD_ADDR(addr))
95 return addr;
96 }
97 current->mm->start_brk = current->mm->brk = end;
98 return 0;
99}
100
101
102
103
104
105
106static int padzero(unsigned long elf_bss)
107{
108 unsigned long nbyte;
109
110 nbyte = ELF_PAGEOFFSET(elf_bss);
111 if (nbyte) {
112 nbyte = ELF_MIN_ALIGN - nbyte;
113 if (clear_user((void __user *) elf_bss, nbyte))
114 return -EFAULT;
115 }
116 return 0;
117}
118
119
120#ifdef CONFIG_STACK_GROWSUP
121#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
122#define STACK_ROUND(sp, items) \
123 ((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
124#define STACK_ALLOC(sp, len) ({ \
125 elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \
126 old_sp; })
127#else
128#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
129#define STACK_ROUND(sp, items) \
130 (((unsigned long) (sp - items)) &~ 15UL)
131#define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
132#endif
133
134#ifndef ELF_BASE_PLATFORM
135
136
137
138
139
140#define ELF_BASE_PLATFORM NULL
141#endif
142
143static int
144create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
145 unsigned long load_addr, unsigned long interp_load_addr)
146{
147 unsigned long p = bprm->p;
148 int argc = bprm->argc;
149 int envc = bprm->envc;
150 elf_addr_t __user *argv;
151 elf_addr_t __user *envp;
152 elf_addr_t __user *sp;
153 elf_addr_t __user *u_platform;
154 elf_addr_t __user *u_base_platform;
155 elf_addr_t __user *u_rand_bytes;
156 const char *k_platform = ELF_PLATFORM;
157 const char *k_base_platform = ELF_BASE_PLATFORM;
158 unsigned char k_rand_bytes[16];
159 int items;
160 elf_addr_t *elf_info;
161 int ei_index = 0;
162 const struct cred *cred = current_cred();
163 struct vm_area_struct *vma;
164
165
166
167
168
169
170
171 p = arch_align_stack(p);
172
173
174
175
176
177
178
179 u_platform = NULL;
180 if (k_platform) {
181 size_t len = strlen(k_platform) + 1;
182
183 u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
184 if (__copy_to_user(u_platform, k_platform, len))
185 return -EFAULT;
186 }
187
188
189
190
191
192 u_base_platform = NULL;
193 if (k_base_platform) {
194 size_t len = strlen(k_base_platform) + 1;
195
196 u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
197 if (__copy_to_user(u_base_platform, k_base_platform, len))
198 return -EFAULT;
199 }
200
201
202
203
204 get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes));
205 u_rand_bytes = (elf_addr_t __user *)
206 STACK_ALLOC(p, sizeof(k_rand_bytes));
207 if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes)))
208 return -EFAULT;
209
210
211 elf_info = (elf_addr_t *)current->mm->saved_auxv;
212
213#define NEW_AUX_ENT(id, val) \
214 do { \
215 elf_info[ei_index++] = id; \
216 elf_info[ei_index++] = val; \
217 } while (0)
218
219#ifdef ARCH_DLINFO
220
221
222
223
224
225
226 ARCH_DLINFO;
227#endif
228 NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
229 NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE);
230 NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
231 NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff);
232 NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
233 NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
234 NEW_AUX_ENT(AT_BASE, interp_load_addr);
235 NEW_AUX_ENT(AT_FLAGS, 0);
236 NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
237 NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid));
238 NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid));
239 NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid));
240 NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid));
241 NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
242 NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes);
243#ifdef ELF_HWCAP2
244 NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);
245#endif
246 NEW_AUX_ENT(AT_EXECFN, bprm->exec);
247 if (k_platform) {
248 NEW_AUX_ENT(AT_PLATFORM,
249 (elf_addr_t)(unsigned long)u_platform);
250 }
251 if (k_base_platform) {
252 NEW_AUX_ENT(AT_BASE_PLATFORM,
253 (elf_addr_t)(unsigned long)u_base_platform);
254 }
255 if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
256 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
257 }
258#undef NEW_AUX_ENT
259
260 memset(&elf_info[ei_index], 0,
261 sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]);
262
263
264 ei_index += 2;
265
266 sp = STACK_ADD(p, ei_index);
267
268 items = (argc + 1) + (envc + 1) + 1;
269 bprm->p = STACK_ROUND(sp, items);
270
271
272#ifdef CONFIG_STACK_GROWSUP
273 sp = (elf_addr_t __user *)bprm->p - items - ei_index;
274 bprm->exec = (unsigned long)sp;
275#else
276 sp = (elf_addr_t __user *)bprm->p;
277#endif
278
279
280
281
282
283
284 vma = find_extend_vma(current->mm, bprm->p);
285 if (!vma)
286 return -EFAULT;
287
288
289 if (__put_user(argc, sp++))
290 return -EFAULT;
291 argv = sp;
292 envp = argv + argc + 1;
293
294
295 p = current->mm->arg_end = current->mm->arg_start;
296 while (argc-- > 0) {
297 size_t len;
298 if (__put_user((elf_addr_t)p, argv++))
299 return -EFAULT;
300 len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
301 if (!len || len > MAX_ARG_STRLEN)
302 return -EINVAL;
303 p += len;
304 }
305 if (__put_user(0, argv))
306 return -EFAULT;
307 current->mm->arg_end = current->mm->env_start = p;
308 while (envc-- > 0) {
309 size_t len;
310 if (__put_user((elf_addr_t)p, envp++))
311 return -EFAULT;
312 len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
313 if (!len || len > MAX_ARG_STRLEN)
314 return -EINVAL;
315 p += len;
316 }
317 if (__put_user(0, envp))
318 return -EFAULT;
319 current->mm->env_end = p;
320
321
322 sp = (elf_addr_t __user *)envp + 1;
323 if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t)))
324 return -EFAULT;
325 return 0;
326}
327
328#ifndef elf_map
329
330static unsigned long elf_map(struct file *filep, unsigned long addr,
331 struct elf_phdr *eppnt, int prot, int type,
332 unsigned long total_size)
333{
334 unsigned long map_addr;
335 unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr);
336 unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr);
337 addr = ELF_PAGESTART(addr);
338 size = ELF_PAGEALIGN(size);
339
340
341
342 if (!size)
343 return addr;
344
345
346
347
348
349
350
351
352
353 if (total_size) {
354 total_size = ELF_PAGEALIGN(total_size);
355 map_addr = vm_mmap(filep, addr, total_size, prot, type, off);
356 if (!BAD_ADDR(map_addr))
357 vm_munmap(map_addr+size, total_size-size);
358 } else
359 map_addr = vm_mmap(filep, addr, size, prot, type, off);
360
361 return(map_addr);
362}
363
364#endif
365
366static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr)
367{
368 int i, first_idx = -1, last_idx = -1;
369
370 for (i = 0; i < nr; i++) {
371 if (cmds[i].p_type == PT_LOAD) {
372 last_idx = i;
373 if (first_idx == -1)
374 first_idx = i;
375 }
376 }
377 if (first_idx == -1)
378 return 0;
379
380 return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz -
381 ELF_PAGESTART(cmds[first_idx].p_vaddr);
382}
383
384
385
386
387
388
389
390static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
391 struct file *interpreter, unsigned long *interp_map_addr,
392 unsigned long no_base)
393{
394 struct elf_phdr *elf_phdata;
395 struct elf_phdr *eppnt;
396 unsigned long load_addr = 0;
397 int load_addr_set = 0;
398 unsigned long last_bss = 0, elf_bss = 0;
399 unsigned long error = ~0UL;
400 unsigned long total_size;
401 int retval, i, size;
402
403
404 if (interp_elf_ex->e_type != ET_EXEC &&
405 interp_elf_ex->e_type != ET_DYN)
406 goto out;
407 if (!elf_check_arch(interp_elf_ex))
408 goto out;
409 if (!interpreter->f_op || !interpreter->f_op->mmap)
410 goto out;
411
412
413
414
415
416 if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr))
417 goto out;
418 if (interp_elf_ex->e_phnum < 1 ||
419 interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr))
420 goto out;
421
422
423 size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum;
424 if (size > ELF_MIN_ALIGN)
425 goto out;
426 elf_phdata = kmalloc(size, GFP_KERNEL);
427 if (!elf_phdata)
428 goto out;
429
430 retval = kernel_read(interpreter, interp_elf_ex->e_phoff,
431 (char *)elf_phdata, size);
432 error = -EIO;
433 if (retval != size) {
434 if (retval < 0)
435 error = retval;
436 goto out_close;
437 }
438
439 total_size = total_mapping_size(elf_phdata, interp_elf_ex->e_phnum);
440 if (!total_size) {
441 error = -EINVAL;
442 goto out_close;
443 }
444
445 eppnt = elf_phdata;
446 for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
447 if (eppnt->p_type == PT_LOAD) {
448 int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
449 int elf_prot = 0;
450 unsigned long vaddr = 0;
451 unsigned long k, map_addr;
452
453 if (eppnt->p_flags & PF_R)
454 elf_prot = PROT_READ;
455 if (eppnt->p_flags & PF_W)
456 elf_prot |= PROT_WRITE;
457 if (eppnt->p_flags & PF_X)
458 elf_prot |= PROT_EXEC;
459 vaddr = eppnt->p_vaddr;
460 if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
461 elf_type |= MAP_FIXED;
462 else if (no_base && interp_elf_ex->e_type == ET_DYN)
463 load_addr = -vaddr;
464
465 map_addr = elf_map(interpreter, load_addr + vaddr,
466 eppnt, elf_prot, elf_type, total_size);
467 total_size = 0;
468 if (!*interp_map_addr)
469 *interp_map_addr = map_addr;
470 error = map_addr;
471 if (BAD_ADDR(map_addr))
472 goto out_close;
473
474 if (!load_addr_set &&
475 interp_elf_ex->e_type == ET_DYN) {
476 load_addr = map_addr - ELF_PAGESTART(vaddr);
477 load_addr_set = 1;
478 }
479
480
481
482
483
484
485 k = load_addr + eppnt->p_vaddr;
486 if (BAD_ADDR(k) ||
487 eppnt->p_filesz > eppnt->p_memsz ||
488 eppnt->p_memsz > TASK_SIZE ||
489 TASK_SIZE - eppnt->p_memsz < k) {
490 error = -ENOMEM;
491 goto out_close;
492 }
493
494
495
496
497
498 k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
499 if (k > elf_bss)
500 elf_bss = k;
501
502
503
504
505
506 k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
507 if (k > last_bss)
508 last_bss = k;
509 }
510 }
511
512 if (last_bss > elf_bss) {
513
514
515
516
517
518
519 if (padzero(elf_bss)) {
520 error = -EFAULT;
521 goto out_close;
522 }
523
524
525 elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1);
526
527
528 error = vm_brk(elf_bss, last_bss - elf_bss);
529 if (BAD_ADDR(error))
530 goto out_close;
531 }
532
533 error = load_addr;
534
535out_close:
536 kfree(elf_phdata);
537out:
538 return error;
539}
540
541
542
543
544
545
546#define INTERPRETER_NONE 0
547#define INTERPRETER_ELF 2
548
549#ifndef STACK_RND_MASK
550#define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12))
551#endif
552
553static unsigned long randomize_stack_top(unsigned long stack_top)
554{
555 unsigned int random_variable = 0;
556
557 if ((current->flags & PF_RANDOMIZE) &&
558 !(current->personality & ADDR_NO_RANDOMIZE)) {
559 random_variable = get_random_int() & STACK_RND_MASK;
560 random_variable <<= PAGE_SHIFT;
561 }
562#ifdef CONFIG_STACK_GROWSUP
563 return PAGE_ALIGN(stack_top) + random_variable;
564#else
565 return PAGE_ALIGN(stack_top) - random_variable;
566#endif
567}
568
569static int load_elf_binary(struct linux_binprm *bprm)
570{
571 struct file *interpreter = NULL;
572 unsigned long load_addr = 0, load_bias = 0;
573 int load_addr_set = 0;
574 char * elf_interpreter = NULL;
575 unsigned long error;
576 struct elf_phdr *elf_ppnt, *elf_phdata;
577 unsigned long elf_bss, elf_brk;
578 int retval, i;
579 unsigned int size;
580 unsigned long elf_entry;
581 unsigned long interp_load_addr = 0;
582 unsigned long start_code, end_code, start_data, end_data;
583 unsigned long reloc_func_desc __maybe_unused = 0;
584 int executable_stack = EXSTACK_DEFAULT;
585 unsigned long def_flags = 0;
586 struct pt_regs *regs = current_pt_regs();
587 struct {
588 struct elfhdr elf_ex;
589 struct elfhdr interp_elf_ex;
590 } *loc;
591
592 loc = kmalloc(sizeof(*loc), GFP_KERNEL);
593 if (!loc) {
594 retval = -ENOMEM;
595 goto out_ret;
596 }
597
598
599 loc->elf_ex = *((struct elfhdr *)bprm->buf);
600
601 retval = -ENOEXEC;
602
603 if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
604 goto out;
605
606 if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN)
607 goto out;
608 if (!elf_check_arch(&loc->elf_ex))
609 goto out;
610 if (!bprm->file->f_op || !bprm->file->f_op->mmap)
611 goto out;
612
613
614 if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr))
615 goto out;
616 if (loc->elf_ex.e_phnum < 1 ||
617 loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr))
618 goto out;
619 size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr);
620 retval = -ENOMEM;
621 elf_phdata = kmalloc(size, GFP_KERNEL);
622 if (!elf_phdata)
623 goto out;
624
625 retval = kernel_read(bprm->file, loc->elf_ex.e_phoff,
626 (char *)elf_phdata, size);
627 if (retval != size) {
628 if (retval >= 0)
629 retval = -EIO;
630 goto out_free_ph;
631 }
632
633 elf_ppnt = elf_phdata;
634 elf_bss = 0;
635 elf_brk = 0;
636
637 start_code = ~0UL;
638 end_code = 0;
639 start_data = 0;
640 end_data = 0;
641
642 for (i = 0; i < loc->elf_ex.e_phnum; i++) {
643 if (elf_ppnt->p_type == PT_INTERP) {
644
645
646
647
648 retval = -ENOEXEC;
649 if (elf_ppnt->p_filesz > PATH_MAX ||
650 elf_ppnt->p_filesz < 2)
651 goto out_free_ph;
652
653 retval = -ENOMEM;
654 elf_interpreter = kmalloc(elf_ppnt->p_filesz,
655 GFP_KERNEL);
656 if (!elf_interpreter)
657 goto out_free_ph;
658
659 retval = kernel_read(bprm->file, elf_ppnt->p_offset,
660 elf_interpreter,
661 elf_ppnt->p_filesz);
662 if (retval != elf_ppnt->p_filesz) {
663 if (retval >= 0)
664 retval = -EIO;
665 goto out_free_interp;
666 }
667
668 retval = -ENOEXEC;
669 if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
670 goto out_free_interp;
671
672 interpreter = open_exec(elf_interpreter);
673 retval = PTR_ERR(interpreter);
674 if (IS_ERR(interpreter))
675 goto out_free_interp;
676
677
678
679
680
681
682 would_dump(bprm, interpreter);
683
684 retval = kernel_read(interpreter, 0, bprm->buf,
685 BINPRM_BUF_SIZE);
686 if (retval != BINPRM_BUF_SIZE) {
687 if (retval >= 0)
688 retval = -EIO;
689 goto out_free_dentry;
690 }
691
692
693 loc->interp_elf_ex = *((struct elfhdr *)bprm->buf);
694 break;
695 }
696 elf_ppnt++;
697 }
698
699 elf_ppnt = elf_phdata;
700 for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++)
701 if (elf_ppnt->p_type == PT_GNU_STACK) {
702 if (elf_ppnt->p_flags & PF_X)
703 executable_stack = EXSTACK_ENABLE_X;
704 else
705 executable_stack = EXSTACK_DISABLE_X;
706 break;
707 }
708
709
710 if (elf_interpreter) {
711 retval = -ELIBBAD;
712
713 if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
714 goto out_free_dentry;
715
716 if (!elf_check_arch(&loc->interp_elf_ex))
717 goto out_free_dentry;
718 }
719
720
721 retval = flush_old_exec(bprm);
722 if (retval)
723 goto out_free_dentry;
724
725
726 current->mm->def_flags = def_flags;
727
728
729
730 SET_PERSONALITY(loc->elf_ex);
731 if (elf_read_implies_exec(loc->elf_ex, executable_stack))
732 current->personality |= READ_IMPLIES_EXEC;
733
734 if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
735 current->flags |= PF_RANDOMIZE;
736
737 setup_new_exec(bprm);
738
739
740
741 current->mm->free_area_cache = current->mm->mmap_base;
742 current->mm->cached_hole_size = 0;
743 retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP),
744 executable_stack);
745 if (retval < 0) {
746 send_sig(SIGKILL, current, 0);
747 goto out_free_dentry;
748 }
749
750 current->mm->start_stack = bprm->p;
751
752
753
754 for(i = 0, elf_ppnt = elf_phdata;
755 i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
756 int elf_prot = 0, elf_flags;
757 unsigned long k, vaddr;
758
759 if (elf_ppnt->p_type != PT_LOAD)
760 continue;
761
762 if (unlikely (elf_brk > elf_bss)) {
763 unsigned long nbyte;
764
765
766
767
768 retval = set_brk(elf_bss + load_bias,
769 elf_brk + load_bias);
770 if (retval) {
771 send_sig(SIGKILL, current, 0);
772 goto out_free_dentry;
773 }
774 nbyte = ELF_PAGEOFFSET(elf_bss);
775 if (nbyte) {
776 nbyte = ELF_MIN_ALIGN - nbyte;
777 if (nbyte > elf_brk - elf_bss)
778 nbyte = elf_brk - elf_bss;
779 if (clear_user((void __user *)elf_bss +
780 load_bias, nbyte)) {
781
782
783
784
785
786 }
787 }
788 }
789
790 if (elf_ppnt->p_flags & PF_R)
791 elf_prot |= PROT_READ;
792 if (elf_ppnt->p_flags & PF_W)
793 elf_prot |= PROT_WRITE;
794 if (elf_ppnt->p_flags & PF_X)
795 elf_prot |= PROT_EXEC;
796
797 elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE;
798
799 vaddr = elf_ppnt->p_vaddr;
800 if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
801 elf_flags |= MAP_FIXED;
802 } else if (loc->elf_ex.e_type == ET_DYN) {
803
804
805
806
807#ifdef CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE
808
809
810
811
812
813
814
815 if (current->flags & PF_RANDOMIZE)
816 load_bias = 0;
817 else
818 load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
819#else
820 load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
821#endif
822 }
823
824 error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
825 elf_prot, elf_flags, 0);
826 if (BAD_ADDR(error)) {
827 send_sig(SIGKILL, current, 0);
828 retval = IS_ERR((void *)error) ?
829 PTR_ERR((void*)error) : -EINVAL;
830 goto out_free_dentry;
831 }
832
833 if (!load_addr_set) {
834 load_addr_set = 1;
835 load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
836 if (loc->elf_ex.e_type == ET_DYN) {
837 load_bias += error -
838 ELF_PAGESTART(load_bias + vaddr);
839 load_addr += load_bias;
840 reloc_func_desc = load_bias;
841 }
842 }
843 k = elf_ppnt->p_vaddr;
844 if (k < start_code)
845 start_code = k;
846 if (start_data < k)
847 start_data = k;
848
849
850
851
852
853
854 if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
855 elf_ppnt->p_memsz > TASK_SIZE ||
856 TASK_SIZE - elf_ppnt->p_memsz < k) {
857
858 send_sig(SIGKILL, current, 0);
859 retval = -EINVAL;
860 goto out_free_dentry;
861 }
862
863 k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
864
865 if (k > elf_bss)
866 elf_bss = k;
867 if ((elf_ppnt->p_flags & PF_X) && end_code < k)
868 end_code = k;
869 if (end_data < k)
870 end_data = k;
871 k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
872 if (k > elf_brk)
873 elf_brk = k;
874 }
875
876 loc->elf_ex.e_entry += load_bias;
877 elf_bss += load_bias;
878 elf_brk += load_bias;
879 start_code += load_bias;
880 end_code += load_bias;
881 start_data += load_bias;
882 end_data += load_bias;
883
884
885
886
887
888
889 retval = set_brk(elf_bss, elf_brk);
890 if (retval) {
891 send_sig(SIGKILL, current, 0);
892 goto out_free_dentry;
893 }
894 if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) {
895 send_sig(SIGSEGV, current, 0);
896 retval = -EFAULT;
897 goto out_free_dentry;
898 }
899
900 if (elf_interpreter) {
901 unsigned long interp_map_addr = 0;
902
903 elf_entry = load_elf_interp(&loc->interp_elf_ex,
904 interpreter,
905 &interp_map_addr,
906 load_bias);
907 if (!IS_ERR((void *)elf_entry)) {
908
909
910
911
912 interp_load_addr = elf_entry;
913 elf_entry += loc->interp_elf_ex.e_entry;
914 }
915 if (BAD_ADDR(elf_entry)) {
916 force_sig(SIGSEGV, current);
917 retval = IS_ERR((void *)elf_entry) ?
918 (int)elf_entry : -EINVAL;
919 goto out_free_dentry;
920 }
921 reloc_func_desc = interp_load_addr;
922
923 allow_write_access(interpreter);
924 fput(interpreter);
925 kfree(elf_interpreter);
926 } else {
927 elf_entry = loc->elf_ex.e_entry;
928 if (BAD_ADDR(elf_entry)) {
929 force_sig(SIGSEGV, current);
930 retval = -EINVAL;
931 goto out_free_dentry;
932 }
933 }
934
935 kfree(elf_phdata);
936
937 set_binfmt(&elf_format);
938
939#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
940 retval = arch_setup_additional_pages(bprm, !!elf_interpreter);
941 if (retval < 0) {
942 send_sig(SIGKILL, current, 0);
943 goto out;
944 }
945#endif
946
947 install_exec_creds(bprm);
948 retval = create_elf_tables(bprm, &loc->elf_ex,
949 load_addr, interp_load_addr);
950 if (retval < 0) {
951 send_sig(SIGKILL, current, 0);
952 goto out;
953 }
954
955 current->mm->end_code = end_code;
956 current->mm->start_code = start_code;
957 current->mm->start_data = start_data;
958 current->mm->end_data = end_data;
959 current->mm->start_stack = bprm->p;
960
961#ifdef arch_randomize_brk
962 if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) {
963 current->mm->brk = current->mm->start_brk =
964 arch_randomize_brk(current->mm);
965#ifdef CONFIG_COMPAT_BRK
966 current->brk_randomized = 1;
967#endif
968 }
969#endif
970
971 if (current->personality & MMAP_PAGE_ZERO) {
972
973
974
975
976 error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
977 MAP_FIXED | MAP_PRIVATE, 0);
978 }
979
980#ifdef ELF_PLAT_INIT
981
982
983
984
985
986
987
988
989
990
991 ELF_PLAT_INIT(regs, reloc_func_desc);
992#endif
993
994 start_thread(regs, elf_entry, bprm->p);
995 retval = 0;
996out:
997 kfree(loc);
998out_ret:
999 return retval;
1000
1001
1002out_free_dentry:
1003 allow_write_access(interpreter);
1004 if (interpreter)
1005 fput(interpreter);
1006out_free_interp:
1007 kfree(elf_interpreter);
1008out_free_ph:
1009 kfree(elf_phdata);
1010 goto out;
1011}
1012
1013
1014
1015static int load_elf_library(struct file *file)
1016{
1017 struct elf_phdr *elf_phdata;
1018 struct elf_phdr *eppnt;
1019 unsigned long elf_bss, bss, len;
1020 int retval, error, i, j;
1021 struct elfhdr elf_ex;
1022
1023 error = -ENOEXEC;
1024 retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex));
1025 if (retval != sizeof(elf_ex))
1026 goto out;
1027
1028 if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
1029 goto out;
1030
1031
1032 if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
1033 !elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap)
1034 goto out;
1035
1036
1037
1038 j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
1039
1040
1041 error = -ENOMEM;
1042 elf_phdata = kmalloc(j, GFP_KERNEL);
1043 if (!elf_phdata)
1044 goto out;
1045
1046 eppnt = elf_phdata;
1047 error = -ENOEXEC;
1048 retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j);
1049 if (retval != j)
1050 goto out_free_ph;
1051
1052 for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
1053 if ((eppnt + i)->p_type == PT_LOAD)
1054 j++;
1055 if (j != 1)
1056 goto out_free_ph;
1057
1058 while (eppnt->p_type != PT_LOAD)
1059 eppnt++;
1060
1061
1062 error = vm_mmap(file,
1063 ELF_PAGESTART(eppnt->p_vaddr),
1064 (eppnt->p_filesz +
1065 ELF_PAGEOFFSET(eppnt->p_vaddr)),
1066 PROT_READ | PROT_WRITE | PROT_EXEC,
1067 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
1068 (eppnt->p_offset -
1069 ELF_PAGEOFFSET(eppnt->p_vaddr)));
1070 if (error != ELF_PAGESTART(eppnt->p_vaddr))
1071 goto out_free_ph;
1072
1073 elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
1074 if (padzero(elf_bss)) {
1075 error = -EFAULT;
1076 goto out_free_ph;
1077 }
1078
1079 len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr +
1080 ELF_MIN_ALIGN - 1);
1081 bss = eppnt->p_memsz + eppnt->p_vaddr;
1082 if (bss > len)
1083 vm_brk(len, bss - len);
1084 error = 0;
1085
1086out_free_ph:
1087 kfree(elf_phdata);
1088out:
1089 return error;
1090}
1091
1092#ifdef CONFIG_ELF_CORE
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108static bool always_dump_vma(struct vm_area_struct *vma)
1109{
1110
1111 if (vma == get_gate_vma(vma->vm_mm))
1112 return true;
1113
1114
1115
1116
1117 if (arch_vma_name(vma))
1118 return true;
1119
1120 return false;
1121}
1122
1123
1124
1125
1126static unsigned long vma_dump_size(struct vm_area_struct *vma,
1127 unsigned long mm_flags)
1128{
1129#define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type))
1130
1131
1132 if (always_dump_vma(vma))
1133 goto whole;
1134
1135 if (vma->vm_flags & VM_DONTDUMP)
1136 return 0;
1137
1138
1139 if (vma->vm_flags & VM_HUGETLB) {
1140 if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED))
1141 goto whole;
1142 if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE))
1143 goto whole;
1144 return 0;
1145 }
1146
1147
1148 if (vma->vm_flags & VM_IO)
1149 return 0;
1150
1151
1152 if (vma->vm_flags & VM_SHARED) {
1153 if (file_inode(vma->vm_file)->i_nlink == 0 ?
1154 FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED))
1155 goto whole;
1156 return 0;
1157 }
1158
1159
1160 if (vma->anon_vma && FILTER(ANON_PRIVATE))
1161 goto whole;
1162 if (vma->vm_file == NULL)
1163 return 0;
1164
1165 if (FILTER(MAPPED_PRIVATE))
1166 goto whole;
1167
1168
1169
1170
1171
1172
1173 if (FILTER(ELF_HEADERS) &&
1174 vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) {
1175 u32 __user *header = (u32 __user *) vma->vm_start;
1176 u32 word;
1177 mm_segment_t fs = get_fs();
1178
1179
1180
1181 union {
1182 u32 cmp;
1183 char elfmag[SELFMAG];
1184 } magic;
1185 BUILD_BUG_ON(SELFMAG != sizeof word);
1186 magic.elfmag[EI_MAG0] = ELFMAG0;
1187 magic.elfmag[EI_MAG1] = ELFMAG1;
1188 magic.elfmag[EI_MAG2] = ELFMAG2;
1189 magic.elfmag[EI_MAG3] = ELFMAG3;
1190
1191
1192
1193
1194 set_fs(USER_DS);
1195 if (unlikely(get_user(word, header)))
1196 word = 0;
1197 set_fs(fs);
1198 if (word == magic.cmp)
1199 return PAGE_SIZE;
1200 }
1201
1202#undef FILTER
1203
1204 return 0;
1205
1206whole:
1207 return vma->vm_end - vma->vm_start;
1208}
1209
1210
1211struct memelfnote
1212{
1213 const char *name;
1214 int type;
1215 unsigned int datasz;
1216 void *data;
1217};
1218
1219static int notesize(struct memelfnote *en)
1220{
1221 int sz;
1222
1223 sz = sizeof(struct elf_note);
1224 sz += roundup(strlen(en->name) + 1, 4);
1225 sz += roundup(en->datasz, 4);
1226
1227 return sz;
1228}
1229
1230#define DUMP_WRITE(addr, nr, foffset) \
1231 do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0)
1232
1233static int alignfile(struct file *file, loff_t *foffset)
1234{
1235 static const char buf[4] = { 0, };
1236 DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset);
1237 return 1;
1238}
1239
1240static int writenote(struct memelfnote *men, struct file *file,
1241 loff_t *foffset)
1242{
1243 struct elf_note en;
1244 en.n_namesz = strlen(men->name) + 1;
1245 en.n_descsz = men->datasz;
1246 en.n_type = men->type;
1247
1248 DUMP_WRITE(&en, sizeof(en), foffset);
1249 DUMP_WRITE(men->name, en.n_namesz, foffset);
1250 if (!alignfile(file, foffset))
1251 return 0;
1252 DUMP_WRITE(men->data, men->datasz, foffset);
1253 if (!alignfile(file, foffset))
1254 return 0;
1255
1256 return 1;
1257}
1258#undef DUMP_WRITE
1259
1260static void fill_elf_header(struct elfhdr *elf, int segs,
1261 u16 machine, u32 flags)
1262{
1263 memset(elf, 0, sizeof(*elf));
1264
1265 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1266 elf->e_ident[EI_CLASS] = ELF_CLASS;
1267 elf->e_ident[EI_DATA] = ELF_DATA;
1268 elf->e_ident[EI_VERSION] = EV_CURRENT;
1269 elf->e_ident[EI_OSABI] = ELF_OSABI;
1270
1271 elf->e_type = ET_CORE;
1272 elf->e_machine = machine;
1273 elf->e_version = EV_CURRENT;
1274 elf->e_phoff = sizeof(struct elfhdr);
1275 elf->e_flags = flags;
1276 elf->e_ehsize = sizeof(struct elfhdr);
1277 elf->e_phentsize = sizeof(struct elf_phdr);
1278 elf->e_phnum = segs;
1279
1280 return;
1281}
1282
1283static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1284{
1285 phdr->p_type = PT_NOTE;
1286 phdr->p_offset = offset;
1287 phdr->p_vaddr = 0;
1288 phdr->p_paddr = 0;
1289 phdr->p_filesz = sz;
1290 phdr->p_memsz = 0;
1291 phdr->p_flags = 0;
1292 phdr->p_align = 0;
1293 return;
1294}
1295
1296static void fill_note(struct memelfnote *note, const char *name, int type,
1297 unsigned int sz, void *data)
1298{
1299 note->name = name;
1300 note->type = type;
1301 note->datasz = sz;
1302 note->data = data;
1303 return;
1304}
1305
1306
1307
1308
1309
1310static void fill_prstatus(struct elf_prstatus *prstatus,
1311 struct task_struct *p, long signr)
1312{
1313 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1314 prstatus->pr_sigpend = p->pending.signal.sig[0];
1315 prstatus->pr_sighold = p->blocked.sig[0];
1316 rcu_read_lock();
1317 prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1318 rcu_read_unlock();
1319 prstatus->pr_pid = task_pid_vnr(p);
1320 prstatus->pr_pgrp = task_pgrp_vnr(p);
1321 prstatus->pr_sid = task_session_vnr(p);
1322 if (thread_group_leader(p)) {
1323 struct task_cputime cputime;
1324
1325
1326
1327
1328
1329 thread_group_cputime(p, &cputime);
1330 cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
1331 cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
1332 } else {
1333 cputime_t utime, stime;
1334
1335 task_cputime(p, &utime, &stime);
1336 cputime_to_timeval(utime, &prstatus->pr_utime);
1337 cputime_to_timeval(stime, &prstatus->pr_stime);
1338 }
1339 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1340 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1341}
1342
1343static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1344 struct mm_struct *mm)
1345{
1346 const struct cred *cred;
1347 unsigned int i, len;
1348
1349
1350 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1351
1352 len = mm->arg_end - mm->arg_start;
1353 if (len >= ELF_PRARGSZ)
1354 len = ELF_PRARGSZ-1;
1355 if (copy_from_user(&psinfo->pr_psargs,
1356 (const char __user *)mm->arg_start, len))
1357 return -EFAULT;
1358 for(i = 0; i < len; i++)
1359 if (psinfo->pr_psargs[i] == 0)
1360 psinfo->pr_psargs[i] = ' ';
1361 psinfo->pr_psargs[len] = 0;
1362
1363 rcu_read_lock();
1364 psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1365 rcu_read_unlock();
1366 psinfo->pr_pid = task_pid_vnr(p);
1367 psinfo->pr_pgrp = task_pgrp_vnr(p);
1368 psinfo->pr_sid = task_session_vnr(p);
1369
1370 i = p->state ? ffz(~p->state) + 1 : 0;
1371 psinfo->pr_state = i;
1372 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1373 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1374 psinfo->pr_nice = task_nice(p);
1375 psinfo->pr_flag = p->flags;
1376 rcu_read_lock();
1377 cred = __task_cred(p);
1378 SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
1379 SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
1380 rcu_read_unlock();
1381 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1382
1383 return 0;
1384}
1385
1386static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm)
1387{
1388 elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv;
1389 int i = 0;
1390 do
1391 i += 2;
1392 while (auxv[i - 2] != AT_NULL);
1393 fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);
1394}
1395
1396static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata,
1397 siginfo_t *siginfo)
1398{
1399 mm_segment_t old_fs = get_fs();
1400 set_fs(KERNEL_DS);
1401 copy_siginfo_to_user((user_siginfo_t __user *) csigdata, siginfo);
1402 set_fs(old_fs);
1403 fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata);
1404}
1405
1406#define MAX_FILE_NOTE_SIZE (4*1024*1024)
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418static void fill_files_note(struct memelfnote *note)
1419{
1420 struct vm_area_struct *vma;
1421 unsigned count, size, names_ofs, remaining, n;
1422 user_long_t *data;
1423 user_long_t *start_end_ofs;
1424 char *name_base, *name_curpos;
1425
1426
1427 count = current->mm->map_count;
1428 size = count * 64;
1429
1430 names_ofs = (2 + 3 * count) * sizeof(data[0]);
1431 alloc:
1432 if (size >= MAX_FILE_NOTE_SIZE)
1433 goto err;
1434 size = round_up(size, PAGE_SIZE);
1435 data = vmalloc(size);
1436 if (!data)
1437 goto err;
1438
1439 start_end_ofs = data + 2;
1440 name_base = name_curpos = ((char *)data) + names_ofs;
1441 remaining = size - names_ofs;
1442 count = 0;
1443 for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
1444 struct file *file;
1445 const char *filename;
1446
1447 file = vma->vm_file;
1448 if (!file)
1449 continue;
1450 filename = d_path(&file->f_path, name_curpos, remaining);
1451 if (IS_ERR(filename)) {
1452 if (PTR_ERR(filename) == -ENAMETOOLONG) {
1453 vfree(data);
1454 size = size * 5 / 4;
1455 goto alloc;
1456 }
1457 continue;
1458 }
1459
1460
1461
1462 n = (name_curpos + remaining) - filename;
1463 remaining = filename - name_curpos;
1464 memmove(name_curpos, filename, n);
1465 name_curpos += n;
1466
1467 *start_end_ofs++ = vma->vm_start;
1468 *start_end_ofs++ = vma->vm_end;
1469 *start_end_ofs++ = vma->vm_pgoff;
1470 count++;
1471 }
1472
1473
1474 data[0] = count;
1475 data[1] = PAGE_SIZE;
1476
1477
1478
1479
1480 n = current->mm->map_count - count;
1481 if (n != 0) {
1482 unsigned shift_bytes = n * 3 * sizeof(data[0]);
1483 memmove(name_base - shift_bytes, name_base,
1484 name_curpos - name_base);
1485 name_curpos -= shift_bytes;
1486 }
1487
1488 size = name_curpos - (char *)data;
1489 fill_note(note, "CORE", NT_FILE, size, data);
1490 err: ;
1491}
1492
1493#ifdef CORE_DUMP_USE_REGSET
1494#include <linux/regset.h>
1495
1496struct elf_thread_core_info {
1497 struct elf_thread_core_info *next;
1498 struct task_struct *task;
1499 struct elf_prstatus prstatus;
1500 struct memelfnote notes[0];
1501};
1502
1503struct elf_note_info {
1504 struct elf_thread_core_info *thread;
1505 struct memelfnote psinfo;
1506 struct memelfnote signote;
1507 struct memelfnote auxv;
1508 struct memelfnote files;
1509 user_siginfo_t csigdata;
1510 size_t size;
1511 int thread_notes;
1512};
1513
1514
1515
1516
1517
1518
1519static void do_thread_regset_writeback(struct task_struct *task,
1520 const struct user_regset *regset)
1521{
1522 if (regset->writeback)
1523 regset->writeback(task, regset, 1);
1524}
1525
1526#ifndef PR_REG_SIZE
1527#define PR_REG_SIZE(S) sizeof(S)
1528#endif
1529
1530#ifndef PRSTATUS_SIZE
1531#define PRSTATUS_SIZE(S) sizeof(S)
1532#endif
1533
1534#ifndef PR_REG_PTR
1535#define PR_REG_PTR(S) (&((S)->pr_reg))
1536#endif
1537
1538#ifndef SET_PR_FPVALID
1539#define SET_PR_FPVALID(S, V) ((S)->pr_fpvalid = (V))
1540#endif
1541
1542static int fill_thread_core_info(struct elf_thread_core_info *t,
1543 const struct user_regset_view *view,
1544 long signr, size_t *total)
1545{
1546 unsigned int i;
1547
1548
1549
1550
1551
1552
1553
1554 fill_prstatus(&t->prstatus, t->task, signr);
1555 (void) view->regsets[0].get(t->task, &view->regsets[0],
1556 0, PR_REG_SIZE(t->prstatus.pr_reg),
1557 PR_REG_PTR(&t->prstatus), NULL);
1558
1559 fill_note(&t->notes[0], "CORE", NT_PRSTATUS,
1560 PRSTATUS_SIZE(t->prstatus), &t->prstatus);
1561 *total += notesize(&t->notes[0]);
1562
1563 do_thread_regset_writeback(t->task, &view->regsets[0]);
1564
1565
1566
1567
1568
1569
1570 for (i = 1; i < view->n; ++i) {
1571 const struct user_regset *regset = &view->regsets[i];
1572 do_thread_regset_writeback(t->task, regset);
1573 if (regset->core_note_type && regset->get &&
1574 (!regset->active || regset->active(t->task, regset))) {
1575 int ret;
1576 size_t size = regset->n * regset->size;
1577 void *data = kmalloc(size, GFP_KERNEL);
1578 if (unlikely(!data))
1579 return 0;
1580 ret = regset->get(t->task, regset,
1581 0, size, data, NULL);
1582 if (unlikely(ret))
1583 kfree(data);
1584 else {
1585 if (regset->core_note_type != NT_PRFPREG)
1586 fill_note(&t->notes[i], "LINUX",
1587 regset->core_note_type,
1588 size, data);
1589 else {
1590 SET_PR_FPVALID(&t->prstatus, 1);
1591 fill_note(&t->notes[i], "CORE",
1592 NT_PRFPREG, size, data);
1593 }
1594 *total += notesize(&t->notes[i]);
1595 }
1596 }
1597 }
1598
1599 return 1;
1600}
1601
1602static int fill_note_info(struct elfhdr *elf, int phdrs,
1603 struct elf_note_info *info,
1604 siginfo_t *siginfo, struct pt_regs *regs)
1605{
1606 struct task_struct *dump_task = current;
1607 const struct user_regset_view *view = task_user_regset_view(dump_task);
1608 struct elf_thread_core_info *t;
1609 struct elf_prpsinfo *psinfo;
1610 struct core_thread *ct;
1611 unsigned int i;
1612
1613 info->size = 0;
1614 info->thread = NULL;
1615
1616 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1617 if (psinfo == NULL) {
1618 info->psinfo.data = NULL;
1619 return 0;
1620 }
1621
1622 fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1623
1624
1625
1626
1627 info->thread_notes = 0;
1628 for (i = 0; i < view->n; ++i)
1629 if (view->regsets[i].core_note_type != 0)
1630 ++info->thread_notes;
1631
1632
1633
1634
1635
1636 if (unlikely(info->thread_notes == 0) ||
1637 unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) {
1638 WARN_ON(1);
1639 return 0;
1640 }
1641
1642
1643
1644
1645 fill_elf_header(elf, phdrs,
1646 view->e_machine, view->e_flags);
1647
1648
1649
1650
1651 for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) {
1652 t = kzalloc(offsetof(struct elf_thread_core_info,
1653 notes[info->thread_notes]),
1654 GFP_KERNEL);
1655 if (unlikely(!t))
1656 return 0;
1657
1658 t->task = ct->task;
1659 if (ct->task == dump_task || !info->thread) {
1660 t->next = info->thread;
1661 info->thread = t;
1662 } else {
1663
1664
1665
1666
1667 t->next = info->thread->next;
1668 info->thread->next = t;
1669 }
1670 }
1671
1672
1673
1674
1675 for (t = info->thread; t != NULL; t = t->next)
1676 if (!fill_thread_core_info(t, view, siginfo->si_signo, &info->size))
1677 return 0;
1678
1679
1680
1681
1682 fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm);
1683 info->size += notesize(&info->psinfo);
1684
1685 fill_siginfo_note(&info->signote, &info->csigdata, siginfo);
1686 info->size += notesize(&info->signote);
1687
1688 fill_auxv_note(&info->auxv, current->mm);
1689 info->size += notesize(&info->auxv);
1690
1691 fill_files_note(&info->files);
1692 info->size += notesize(&info->files);
1693
1694 return 1;
1695}
1696
1697static size_t get_note_info_size(struct elf_note_info *info)
1698{
1699 return info->size;
1700}
1701
1702
1703
1704
1705
1706static int write_note_info(struct elf_note_info *info,
1707 struct file *file, loff_t *foffset)
1708{
1709 bool first = 1;
1710 struct elf_thread_core_info *t = info->thread;
1711
1712 do {
1713 int i;
1714
1715 if (!writenote(&t->notes[0], file, foffset))
1716 return 0;
1717
1718 if (first && !writenote(&info->psinfo, file, foffset))
1719 return 0;
1720 if (first && !writenote(&info->signote, file, foffset))
1721 return 0;
1722 if (first && !writenote(&info->auxv, file, foffset))
1723 return 0;
1724 if (first && !writenote(&info->files, file, foffset))
1725 return 0;
1726
1727 for (i = 1; i < info->thread_notes; ++i)
1728 if (t->notes[i].data &&
1729 !writenote(&t->notes[i], file, foffset))
1730 return 0;
1731
1732 first = 0;
1733 t = t->next;
1734 } while (t);
1735
1736 return 1;
1737}
1738
1739static void free_note_info(struct elf_note_info *info)
1740{
1741 struct elf_thread_core_info *threads = info->thread;
1742 while (threads) {
1743 unsigned int i;
1744 struct elf_thread_core_info *t = threads;
1745 threads = t->next;
1746 WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus);
1747 for (i = 1; i < info->thread_notes; ++i)
1748 kfree(t->notes[i].data);
1749 kfree(t);
1750 }
1751 kfree(info->psinfo.data);
1752 vfree(info->files.data);
1753}
1754
1755#else
1756
1757
1758struct elf_thread_status
1759{
1760 struct list_head list;
1761 struct elf_prstatus prstatus;
1762 elf_fpregset_t fpu;
1763 struct task_struct *thread;
1764#ifdef ELF_CORE_COPY_XFPREGS
1765 elf_fpxregset_t xfpu;
1766#endif
1767 struct memelfnote notes[3];
1768 int num_notes;
1769};
1770
1771
1772
1773
1774
1775
1776static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1777{
1778 int sz = 0;
1779 struct task_struct *p = t->thread;
1780 t->num_notes = 0;
1781
1782 fill_prstatus(&t->prstatus, p, signr);
1783 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1784
1785 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1786 &(t->prstatus));
1787 t->num_notes++;
1788 sz += notesize(&t->notes[0]);
1789
1790 if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL,
1791 &t->fpu))) {
1792 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1793 &(t->fpu));
1794 t->num_notes++;
1795 sz += notesize(&t->notes[1]);
1796 }
1797
1798#ifdef ELF_CORE_COPY_XFPREGS
1799 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1800 fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
1801 sizeof(t->xfpu), &t->xfpu);
1802 t->num_notes++;
1803 sz += notesize(&t->notes[2]);
1804 }
1805#endif
1806 return sz;
1807}
1808
1809struct elf_note_info {
1810 struct memelfnote *notes;
1811 struct elf_prstatus *prstatus;
1812 struct elf_prpsinfo *psinfo;
1813 struct list_head thread_list;
1814 elf_fpregset_t *fpu;
1815#ifdef ELF_CORE_COPY_XFPREGS
1816 elf_fpxregset_t *xfpu;
1817#endif
1818 user_siginfo_t csigdata;
1819 int thread_status_size;
1820 int numnote;
1821};
1822
1823static int elf_note_info_init(struct elf_note_info *info)
1824{
1825 memset(info, 0, sizeof(*info));
1826 INIT_LIST_HEAD(&info->thread_list);
1827
1828
1829 info->notes = kmalloc(8 * sizeof(struct memelfnote), GFP_KERNEL);
1830 if (!info->notes)
1831 return 0;
1832 info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
1833 if (!info->psinfo)
1834 return 0;
1835 info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL);
1836 if (!info->prstatus)
1837 return 0;
1838 info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
1839 if (!info->fpu)
1840 return 0;
1841#ifdef ELF_CORE_COPY_XFPREGS
1842 info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL);
1843 if (!info->xfpu)
1844 return 0;
1845#endif
1846 return 1;
1847}
1848
1849static int fill_note_info(struct elfhdr *elf, int phdrs,
1850 struct elf_note_info *info,
1851 siginfo_t *siginfo, struct pt_regs *regs)
1852{
1853 struct list_head *t;
1854
1855 if (!elf_note_info_init(info))
1856 return 0;
1857
1858 if (siginfo->si_signo) {
1859 struct core_thread *ct;
1860 struct elf_thread_status *ets;
1861
1862 for (ct = current->mm->core_state->dumper.next;
1863 ct; ct = ct->next) {
1864 ets = kzalloc(sizeof(*ets), GFP_KERNEL);
1865 if (!ets)
1866 return 0;
1867
1868 ets->thread = ct->task;
1869 list_add(&ets->list, &info->thread_list);
1870 }
1871
1872 list_for_each(t, &info->thread_list) {
1873 int sz;
1874
1875 ets = list_entry(t, struct elf_thread_status, list);
1876 sz = elf_dump_thread_status(siginfo->si_signo, ets);
1877 info->thread_status_size += sz;
1878 }
1879 }
1880
1881 memset(info->prstatus, 0, sizeof(*info->prstatus));
1882 fill_prstatus(info->prstatus, current, siginfo->si_signo);
1883 elf_core_copy_regs(&info->prstatus->pr_reg, regs);
1884
1885
1886 fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS);
1887
1888
1889
1890
1891
1892
1893 fill_note(info->notes + 0, "CORE", NT_PRSTATUS,
1894 sizeof(*info->prstatus), info->prstatus);
1895 fill_psinfo(info->psinfo, current->group_leader, current->mm);
1896 fill_note(info->notes + 1, "CORE", NT_PRPSINFO,
1897 sizeof(*info->psinfo), info->psinfo);
1898
1899 fill_siginfo_note(info->notes + 2, &info->csigdata, siginfo);
1900 fill_auxv_note(info->notes + 3, current->mm);
1901 fill_files_note(info->notes + 4);
1902
1903 info->numnote = 5;
1904
1905
1906 info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs,
1907 info->fpu);
1908 if (info->prstatus->pr_fpvalid)
1909 fill_note(info->notes + info->numnote++,
1910 "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu);
1911#ifdef ELF_CORE_COPY_XFPREGS
1912 if (elf_core_copy_task_xfpregs(current, info->xfpu))
1913 fill_note(info->notes + info->numnote++,
1914 "LINUX", ELF_CORE_XFPREG_TYPE,
1915 sizeof(*info->xfpu), info->xfpu);
1916#endif
1917
1918 return 1;
1919}
1920
1921static size_t get_note_info_size(struct elf_note_info *info)
1922{
1923 int sz = 0;
1924 int i;
1925
1926 for (i = 0; i < info->numnote; i++)
1927 sz += notesize(info->notes + i);
1928
1929 sz += info->thread_status_size;
1930
1931 return sz;
1932}
1933
1934static int write_note_info(struct elf_note_info *info,
1935 struct file *file, loff_t *foffset)
1936{
1937 int i;
1938 struct list_head *t;
1939
1940 for (i = 0; i < info->numnote; i++)
1941 if (!writenote(info->notes + i, file, foffset))
1942 return 0;
1943
1944
1945 list_for_each(t, &info->thread_list) {
1946 struct elf_thread_status *tmp =
1947 list_entry(t, struct elf_thread_status, list);
1948
1949 for (i = 0; i < tmp->num_notes; i++)
1950 if (!writenote(&tmp->notes[i], file, foffset))
1951 return 0;
1952 }
1953
1954 return 1;
1955}
1956
1957static void free_note_info(struct elf_note_info *info)
1958{
1959 while (!list_empty(&info->thread_list)) {
1960 struct list_head *tmp = info->thread_list.next;
1961 list_del(tmp);
1962 kfree(list_entry(tmp, struct elf_thread_status, list));
1963 }
1964
1965
1966 vfree(info->notes[4].data);
1967
1968 kfree(info->prstatus);
1969 kfree(info->psinfo);
1970 kfree(info->notes);
1971 kfree(info->fpu);
1972#ifdef ELF_CORE_COPY_XFPREGS
1973 kfree(info->xfpu);
1974#endif
1975}
1976
1977#endif
1978
1979static struct vm_area_struct *first_vma(struct task_struct *tsk,
1980 struct vm_area_struct *gate_vma)
1981{
1982 struct vm_area_struct *ret = tsk->mm->mmap;
1983
1984 if (ret)
1985 return ret;
1986 return gate_vma;
1987}
1988
1989
1990
1991
1992static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
1993 struct vm_area_struct *gate_vma)
1994{
1995 struct vm_area_struct *ret;
1996
1997 ret = this_vma->vm_next;
1998 if (ret)
1999 return ret;
2000 if (this_vma == gate_vma)
2001 return NULL;
2002 return gate_vma;
2003}
2004
2005static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
2006 elf_addr_t e_shoff, int segs)
2007{
2008 elf->e_shoff = e_shoff;
2009 elf->e_shentsize = sizeof(*shdr4extnum);
2010 elf->e_shnum = 1;
2011 elf->e_shstrndx = SHN_UNDEF;
2012
2013 memset(shdr4extnum, 0, sizeof(*shdr4extnum));
2014
2015 shdr4extnum->sh_type = SHT_NULL;
2016 shdr4extnum->sh_size = elf->e_shnum;
2017 shdr4extnum->sh_link = elf->e_shstrndx;
2018 shdr4extnum->sh_info = segs;
2019}
2020
2021static size_t elf_core_vma_data_size(struct vm_area_struct *gate_vma,
2022 unsigned long mm_flags)
2023{
2024 struct vm_area_struct *vma;
2025 size_t size = 0;
2026
2027 for (vma = first_vma(current, gate_vma); vma != NULL;
2028 vma = next_vma(vma, gate_vma))
2029 size += vma_dump_size(vma, mm_flags);
2030 return size;
2031}
2032
2033
2034
2035
2036
2037
2038
2039
2040static int elf_core_dump(struct coredump_params *cprm)
2041{
2042 int has_dumped = 0;
2043 mm_segment_t fs;
2044 int segs;
2045 size_t size = 0;
2046 struct vm_area_struct *vma, *gate_vma;
2047 struct elfhdr *elf = NULL;
2048 loff_t offset = 0, dataoff, foffset;
2049 struct elf_note_info info;
2050 struct elf_phdr *phdr4note = NULL;
2051 struct elf_shdr *shdr4extnum = NULL;
2052 Elf_Half e_phnum;
2053 elf_addr_t e_shoff;
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
2069 if (!elf)
2070 goto out;
2071
2072
2073
2074
2075 segs = current->mm->map_count;
2076 segs += elf_core_extra_phdrs();
2077
2078 gate_vma = get_gate_vma(current->mm);
2079 if (gate_vma != NULL)
2080 segs++;
2081
2082
2083 segs++;
2084
2085
2086
2087
2088 e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
2089
2090
2091
2092
2093
2094 if (!fill_note_info(elf, e_phnum, &info, cprm->siginfo, cprm->regs))
2095 goto cleanup;
2096
2097 has_dumped = 1;
2098
2099 fs = get_fs();
2100 set_fs(KERNEL_DS);
2101
2102 offset += sizeof(*elf);
2103 offset += segs * sizeof(struct elf_phdr);
2104 foffset = offset;
2105
2106
2107 {
2108 size_t sz = get_note_info_size(&info);
2109
2110 sz += elf_coredump_extra_notes_size();
2111
2112 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
2113 if (!phdr4note)
2114 goto end_coredump;
2115
2116 fill_elf_note_phdr(phdr4note, sz, offset);
2117 offset += sz;
2118 }
2119
2120 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
2121
2122 offset += elf_core_vma_data_size(gate_vma, cprm->mm_flags);
2123 offset += elf_core_extra_data_size();
2124 e_shoff = offset;
2125
2126 if (e_phnum == PN_XNUM) {
2127 shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
2128 if (!shdr4extnum)
2129 goto end_coredump;
2130 fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
2131 }
2132
2133 offset = dataoff;
2134
2135 size += sizeof(*elf);
2136 if (size > cprm->limit || !dump_write(cprm->file, elf, sizeof(*elf)))
2137 goto end_coredump;
2138
2139 size += sizeof(*phdr4note);
2140 if (size > cprm->limit
2141 || !dump_write(cprm->file, phdr4note, sizeof(*phdr4note)))
2142 goto end_coredump;
2143
2144
2145 for (vma = first_vma(current, gate_vma); vma != NULL;
2146 vma = next_vma(vma, gate_vma)) {
2147 struct elf_phdr phdr;
2148
2149 phdr.p_type = PT_LOAD;
2150 phdr.p_offset = offset;
2151 phdr.p_vaddr = vma->vm_start;
2152 phdr.p_paddr = 0;
2153 phdr.p_filesz = vma_dump_size(vma, cprm->mm_flags);
2154 phdr.p_memsz = vma->vm_end - vma->vm_start;
2155 offset += phdr.p_filesz;
2156 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
2157 if (vma->vm_flags & VM_WRITE)
2158 phdr.p_flags |= PF_W;
2159 if (vma->vm_flags & VM_EXEC)
2160 phdr.p_flags |= PF_X;
2161 phdr.p_align = ELF_EXEC_PAGESIZE;
2162
2163 size += sizeof(phdr);
2164 if (size > cprm->limit
2165 || !dump_write(cprm->file, &phdr, sizeof(phdr)))
2166 goto end_coredump;
2167 }
2168
2169 if (!elf_core_write_extra_phdrs(cprm->file, offset, &size, cprm->limit))
2170 goto end_coredump;
2171
2172
2173 if (!write_note_info(&info, cprm->file, &foffset))
2174 goto end_coredump;
2175
2176 if (elf_coredump_extra_notes_write(cprm->file, &foffset))
2177 goto end_coredump;
2178
2179
2180 if (!dump_seek(cprm->file, dataoff - foffset))
2181 goto end_coredump;
2182
2183 for (vma = first_vma(current, gate_vma); vma != NULL;
2184 vma = next_vma(vma, gate_vma)) {
2185 unsigned long addr;
2186 unsigned long end;
2187
2188 end = vma->vm_start + vma_dump_size(vma, cprm->mm_flags);
2189
2190 for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) {
2191 struct page *page;
2192 int stop;
2193
2194 page = get_dump_page(addr);
2195 if (page) {
2196 void *kaddr = kmap(page);
2197 stop = ((size += PAGE_SIZE) > cprm->limit) ||
2198 !dump_write(cprm->file, kaddr,
2199 PAGE_SIZE);
2200 kunmap(page);
2201 page_cache_release(page);
2202 } else
2203 stop = !dump_seek(cprm->file, PAGE_SIZE);
2204 if (stop)
2205 goto end_coredump;
2206 }
2207 }
2208
2209 if (!elf_core_write_extra_data(cprm->file, &size, cprm->limit))
2210 goto end_coredump;
2211
2212 if (e_phnum == PN_XNUM) {
2213 size += sizeof(*shdr4extnum);
2214 if (size > cprm->limit
2215 || !dump_write(cprm->file, shdr4extnum,
2216 sizeof(*shdr4extnum)))
2217 goto end_coredump;
2218 }
2219
2220end_coredump:
2221 set_fs(fs);
2222
2223cleanup:
2224 free_note_info(&info);
2225 kfree(shdr4extnum);
2226 kfree(phdr4note);
2227 kfree(elf);
2228out:
2229 return has_dumped;
2230}
2231
2232#endif
2233
2234static int __init init_elf_binfmt(void)
2235{
2236 register_binfmt(&elf_format);
2237 return 0;
2238}
2239
2240static void __exit exit_elf_binfmt(void)
2241{
2242
2243 unregister_binfmt(&elf_format);
2244}
2245
2246core_initcall(init_elf_binfmt);
2247module_exit(exit_elf_binfmt);
2248MODULE_LICENSE("GPL");
2249