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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/elf-randomize.h>
35#include <linux/utsname.h>
36#include <linux/coredump.h>
37#include <linux/sched.h>
38#include <linux/dax.h>
39#include <asm/uaccess.h>
40#include <asm/param.h>
41#include <asm/page.h>
42
43#ifndef user_long_t
44#define user_long_t long
45#endif
46#ifndef user_siginfo_t
47#define user_siginfo_t siginfo_t
48#endif
49
50static int load_elf_binary(struct linux_binprm *bprm);
51static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *,
52 int, int, unsigned long);
53
54#ifdef CONFIG_USELIB
55static int load_elf_library(struct file *);
56#else
57#define load_elf_library NULL
58#endif
59
60
61
62
63
64#ifdef CONFIG_ELF_CORE
65static int elf_core_dump(struct coredump_params *cprm);
66#else
67#define elf_core_dump NULL
68#endif
69
70#if ELF_EXEC_PAGESIZE > PAGE_SIZE
71#define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE
72#else
73#define ELF_MIN_ALIGN PAGE_SIZE
74#endif
75
76#ifndef ELF_CORE_EFLAGS
77#define ELF_CORE_EFLAGS 0
78#endif
79
80#define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
81#define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
82#define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
83
84static struct linux_binfmt elf_format = {
85 .module = THIS_MODULE,
86 .load_binary = load_elf_binary,
87 .load_shlib = load_elf_library,
88 .core_dump = elf_core_dump,
89 .min_coredump = ELF_EXEC_PAGESIZE,
90};
91
92#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
93
94static int set_brk(unsigned long start, unsigned long end)
95{
96 start = ELF_PAGEALIGN(start);
97 end = ELF_PAGEALIGN(end);
98 if (end > start) {
99 unsigned long addr;
100 addr = vm_brk(start, end - start);
101 if (BAD_ADDR(addr))
102 return addr;
103 }
104 current->mm->start_brk = current->mm->brk = end;
105 return 0;
106}
107
108
109
110
111
112
113static int padzero(unsigned long elf_bss)
114{
115 unsigned long nbyte;
116
117 nbyte = ELF_PAGEOFFSET(elf_bss);
118 if (nbyte) {
119 nbyte = ELF_MIN_ALIGN - nbyte;
120 if (clear_user((void __user *) elf_bss, nbyte))
121 return -EFAULT;
122 }
123 return 0;
124}
125
126
127#ifdef CONFIG_STACK_GROWSUP
128#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
129#define STACK_ROUND(sp, items) \
130 ((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
131#define STACK_ALLOC(sp, len) ({ \
132 elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \
133 old_sp; })
134#else
135#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
136#define STACK_ROUND(sp, items) \
137 (((unsigned long) (sp - items)) &~ 15UL)
138#define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
139#endif
140
141#ifndef ELF_BASE_PLATFORM
142
143
144
145
146
147#define ELF_BASE_PLATFORM NULL
148#endif
149
150static int
151create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
152 unsigned long load_addr, unsigned long interp_load_addr)
153{
154 unsigned long p = bprm->p;
155 int argc = bprm->argc;
156 int envc = bprm->envc;
157 elf_addr_t __user *argv;
158 elf_addr_t __user *envp;
159 elf_addr_t __user *sp;
160 elf_addr_t __user *u_platform;
161 elf_addr_t __user *u_base_platform;
162 elf_addr_t __user *u_rand_bytes;
163 const char *k_platform = ELF_PLATFORM;
164 const char *k_base_platform = ELF_BASE_PLATFORM;
165 unsigned char k_rand_bytes[16];
166 int items;
167 elf_addr_t *elf_info;
168 int ei_index = 0;
169 const struct cred *cred = current_cred();
170 struct vm_area_struct *vma;
171
172
173
174
175
176
177
178 p = arch_align_stack(p);
179
180
181
182
183
184
185
186 u_platform = NULL;
187 if (k_platform) {
188 size_t len = strlen(k_platform) + 1;
189
190 u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
191 if (__copy_to_user(u_platform, k_platform, len))
192 return -EFAULT;
193 }
194
195
196
197
198
199 u_base_platform = NULL;
200 if (k_base_platform) {
201 size_t len = strlen(k_base_platform) + 1;
202
203 u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
204 if (__copy_to_user(u_base_platform, k_base_platform, len))
205 return -EFAULT;
206 }
207
208
209
210
211 get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes));
212 u_rand_bytes = (elf_addr_t __user *)
213 STACK_ALLOC(p, sizeof(k_rand_bytes));
214 if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes)))
215 return -EFAULT;
216
217
218 elf_info = (elf_addr_t *)current->mm->saved_auxv;
219
220#define NEW_AUX_ENT(id, val) \
221 do { \
222 elf_info[ei_index++] = id; \
223 elf_info[ei_index++] = val; \
224 } while (0)
225
226#ifdef ARCH_DLINFO
227
228
229
230
231
232
233 ARCH_DLINFO;
234#endif
235 NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
236 NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE);
237 NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
238 NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff);
239 NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
240 NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
241 NEW_AUX_ENT(AT_BASE, interp_load_addr);
242 NEW_AUX_ENT(AT_FLAGS, 0);
243 NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
244 NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid));
245 NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid));
246 NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid));
247 NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid));
248 NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
249 NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes);
250#ifdef ELF_HWCAP2
251 NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);
252#endif
253 NEW_AUX_ENT(AT_EXECFN, bprm->exec);
254 if (k_platform) {
255 NEW_AUX_ENT(AT_PLATFORM,
256 (elf_addr_t)(unsigned long)u_platform);
257 }
258 if (k_base_platform) {
259 NEW_AUX_ENT(AT_BASE_PLATFORM,
260 (elf_addr_t)(unsigned long)u_base_platform);
261 }
262 if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
263 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
264 }
265#undef NEW_AUX_ENT
266
267 memset(&elf_info[ei_index], 0,
268 sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]);
269
270
271 ei_index += 2;
272
273 sp = STACK_ADD(p, ei_index);
274
275 items = (argc + 1) + (envc + 1) + 1;
276 bprm->p = STACK_ROUND(sp, items);
277
278
279#ifdef CONFIG_STACK_GROWSUP
280 sp = (elf_addr_t __user *)bprm->p - items - ei_index;
281 bprm->exec = (unsigned long)sp;
282#else
283 sp = (elf_addr_t __user *)bprm->p;
284#endif
285
286
287
288
289
290
291 vma = find_extend_vma(current->mm, bprm->p);
292 if (!vma)
293 return -EFAULT;
294
295
296 if (__put_user(argc, sp++))
297 return -EFAULT;
298 argv = sp;
299 envp = argv + argc + 1;
300
301
302 p = current->mm->arg_end = current->mm->arg_start;
303 while (argc-- > 0) {
304 size_t len;
305 if (__put_user((elf_addr_t)p, argv++))
306 return -EFAULT;
307 len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
308 if (!len || len > MAX_ARG_STRLEN)
309 return -EINVAL;
310 p += len;
311 }
312 if (__put_user(0, argv))
313 return -EFAULT;
314 current->mm->arg_end = current->mm->env_start = p;
315 while (envc-- > 0) {
316 size_t len;
317 if (__put_user((elf_addr_t)p, envp++))
318 return -EFAULT;
319 len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
320 if (!len || len > MAX_ARG_STRLEN)
321 return -EINVAL;
322 p += len;
323 }
324 if (__put_user(0, envp))
325 return -EFAULT;
326 current->mm->env_end = p;
327
328
329 sp = (elf_addr_t __user *)envp + 1;
330 if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t)))
331 return -EFAULT;
332 return 0;
333}
334
335#ifndef elf_map
336
337static unsigned long elf_map(struct file *filep, unsigned long addr,
338 struct elf_phdr *eppnt, int prot, int type,
339 unsigned long total_size)
340{
341 unsigned long map_addr;
342 unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr);
343 unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr);
344 addr = ELF_PAGESTART(addr);
345 size = ELF_PAGEALIGN(size);
346
347
348
349 if (!size)
350 return addr;
351
352
353
354
355
356
357
358
359
360 if (total_size) {
361 total_size = ELF_PAGEALIGN(total_size);
362 map_addr = vm_mmap(filep, addr, total_size, prot, type, off);
363 if (!BAD_ADDR(map_addr))
364 vm_munmap(map_addr+size, total_size-size);
365 } else
366 map_addr = vm_mmap(filep, addr, size, prot, type, off);
367
368 return(map_addr);
369}
370
371#endif
372
373static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr)
374{
375 int i, first_idx = -1, last_idx = -1;
376
377 for (i = 0; i < nr; i++) {
378 if (cmds[i].p_type == PT_LOAD) {
379 last_idx = i;
380 if (first_idx == -1)
381 first_idx = i;
382 }
383 }
384 if (first_idx == -1)
385 return 0;
386
387 return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz -
388 ELF_PAGESTART(cmds[first_idx].p_vaddr);
389}
390
391
392
393
394
395
396
397
398
399
400static struct elf_phdr *load_elf_phdrs(struct elfhdr *elf_ex,
401 struct file *elf_file)
402{
403 struct elf_phdr *elf_phdata = NULL;
404 int retval, size, err = -1;
405
406
407
408
409
410 if (elf_ex->e_phentsize != sizeof(struct elf_phdr))
411 goto out;
412
413
414 if (elf_ex->e_phnum < 1 ||
415 elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr))
416 goto out;
417
418
419 size = sizeof(struct elf_phdr) * elf_ex->e_phnum;
420 if (size > ELF_MIN_ALIGN)
421 goto out;
422
423 elf_phdata = kmalloc(size, GFP_KERNEL);
424 if (!elf_phdata)
425 goto out;
426
427
428 retval = kernel_read(elf_file, elf_ex->e_phoff,
429 (char *)elf_phdata, size);
430 if (retval != size) {
431 err = (retval < 0) ? retval : -EIO;
432 goto out;
433 }
434
435
436 err = 0;
437out:
438 if (err) {
439 kfree(elf_phdata);
440 elf_phdata = NULL;
441 }
442 return elf_phdata;
443}
444
445#ifndef CONFIG_ARCH_BINFMT_ELF_STATE
446
447
448
449
450
451
452
453
454
455
456
457
458struct arch_elf_state {
459};
460
461#define INIT_ARCH_ELF_STATE {}
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481static inline int arch_elf_pt_proc(struct elfhdr *ehdr,
482 struct elf_phdr *phdr,
483 struct file *elf, bool is_interp,
484 struct arch_elf_state *state)
485{
486
487 return 0;
488}
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505static inline int arch_check_elf(struct elfhdr *ehdr, bool has_interp,
506 struct elfhdr *interp_ehdr,
507 struct arch_elf_state *state)
508{
509
510 return 0;
511}
512
513#endif
514
515
516
517
518
519
520static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
521 struct file *interpreter, unsigned long *interp_map_addr,
522 unsigned long no_base, struct elf_phdr *interp_elf_phdata)
523{
524 struct elf_phdr *eppnt;
525 unsigned long load_addr = 0;
526 int load_addr_set = 0;
527 unsigned long last_bss = 0, elf_bss = 0;
528 unsigned long error = ~0UL;
529 unsigned long total_size;
530 int i;
531
532
533 if (interp_elf_ex->e_type != ET_EXEC &&
534 interp_elf_ex->e_type != ET_DYN)
535 goto out;
536 if (!elf_check_arch(interp_elf_ex))
537 goto out;
538 if (!interpreter->f_op->mmap)
539 goto out;
540
541 total_size = total_mapping_size(interp_elf_phdata,
542 interp_elf_ex->e_phnum);
543 if (!total_size) {
544 error = -EINVAL;
545 goto out;
546 }
547
548 eppnt = interp_elf_phdata;
549 for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
550 if (eppnt->p_type == PT_LOAD) {
551 int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
552 int elf_prot = 0;
553 unsigned long vaddr = 0;
554 unsigned long k, map_addr;
555
556 if (eppnt->p_flags & PF_R)
557 elf_prot = PROT_READ;
558 if (eppnt->p_flags & PF_W)
559 elf_prot |= PROT_WRITE;
560 if (eppnt->p_flags & PF_X)
561 elf_prot |= PROT_EXEC;
562 vaddr = eppnt->p_vaddr;
563 if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
564 elf_type |= MAP_FIXED;
565 else if (no_base && interp_elf_ex->e_type == ET_DYN)
566 load_addr = -vaddr;
567
568 map_addr = elf_map(interpreter, load_addr + vaddr,
569 eppnt, elf_prot, elf_type, total_size);
570 total_size = 0;
571 if (!*interp_map_addr)
572 *interp_map_addr = map_addr;
573 error = map_addr;
574 if (BAD_ADDR(map_addr))
575 goto out;
576
577 if (!load_addr_set &&
578 interp_elf_ex->e_type == ET_DYN) {
579 load_addr = map_addr - ELF_PAGESTART(vaddr);
580 load_addr_set = 1;
581 }
582
583
584
585
586
587
588 k = load_addr + eppnt->p_vaddr;
589 if (BAD_ADDR(k) ||
590 eppnt->p_filesz > eppnt->p_memsz ||
591 eppnt->p_memsz > TASK_SIZE ||
592 TASK_SIZE - eppnt->p_memsz < k) {
593 error = -ENOMEM;
594 goto out;
595 }
596
597
598
599
600
601 k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
602 if (k > elf_bss)
603 elf_bss = k;
604
605
606
607
608
609 k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
610 if (k > last_bss)
611 last_bss = k;
612 }
613 }
614
615 if (last_bss > elf_bss) {
616
617
618
619
620
621
622 if (padzero(elf_bss)) {
623 error = -EFAULT;
624 goto out;
625 }
626
627
628 elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1);
629
630
631 error = vm_brk(elf_bss, last_bss - elf_bss);
632 if (BAD_ADDR(error))
633 goto out;
634 }
635
636 error = load_addr;
637out:
638 return error;
639}
640
641
642
643
644
645
646#ifndef STACK_RND_MASK
647#define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12))
648#endif
649
650static unsigned long randomize_stack_top(unsigned long stack_top)
651{
652 unsigned long random_variable = 0;
653
654 if ((current->flags & PF_RANDOMIZE) &&
655 !(current->personality & ADDR_NO_RANDOMIZE)) {
656 random_variable = get_random_long();
657 random_variable &= STACK_RND_MASK;
658 random_variable <<= PAGE_SHIFT;
659 }
660#ifdef CONFIG_STACK_GROWSUP
661 return PAGE_ALIGN(stack_top) + random_variable;
662#else
663 return PAGE_ALIGN(stack_top) - random_variable;
664#endif
665}
666
667static int load_elf_binary(struct linux_binprm *bprm)
668{
669 struct file *interpreter = NULL;
670 unsigned long load_addr = 0, load_bias = 0;
671 int load_addr_set = 0;
672 char * elf_interpreter = NULL;
673 unsigned long error;
674 struct elf_phdr *elf_ppnt, *elf_phdata, *interp_elf_phdata = NULL;
675 unsigned long elf_bss, elf_brk;
676 int retval, i;
677 unsigned long elf_entry;
678 unsigned long interp_load_addr = 0;
679 unsigned long start_code, end_code, start_data, end_data;
680 unsigned long reloc_func_desc __maybe_unused = 0;
681 int executable_stack = EXSTACK_DEFAULT;
682 struct pt_regs *regs = current_pt_regs();
683 struct {
684 struct elfhdr elf_ex;
685 struct elfhdr interp_elf_ex;
686 } *loc;
687 struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE;
688
689 loc = kmalloc(sizeof(*loc), GFP_KERNEL);
690 if (!loc) {
691 retval = -ENOMEM;
692 goto out_ret;
693 }
694
695
696 loc->elf_ex = *((struct elfhdr *)bprm->buf);
697
698 retval = -ENOEXEC;
699
700 if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
701 goto out;
702
703 if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN)
704 goto out;
705 if (!elf_check_arch(&loc->elf_ex))
706 goto out;
707 if (!bprm->file->f_op->mmap)
708 goto out;
709
710 elf_phdata = load_elf_phdrs(&loc->elf_ex, bprm->file);
711 if (!elf_phdata)
712 goto out;
713
714 elf_ppnt = elf_phdata;
715 elf_bss = 0;
716 elf_brk = 0;
717
718 start_code = ~0UL;
719 end_code = 0;
720 start_data = 0;
721 end_data = 0;
722
723 for (i = 0; i < loc->elf_ex.e_phnum; i++) {
724 if (elf_ppnt->p_type == PT_INTERP) {
725
726
727
728
729 retval = -ENOEXEC;
730 if (elf_ppnt->p_filesz > PATH_MAX ||
731 elf_ppnt->p_filesz < 2)
732 goto out_free_ph;
733
734 retval = -ENOMEM;
735 elf_interpreter = kmalloc(elf_ppnt->p_filesz,
736 GFP_KERNEL);
737 if (!elf_interpreter)
738 goto out_free_ph;
739
740 retval = kernel_read(bprm->file, elf_ppnt->p_offset,
741 elf_interpreter,
742 elf_ppnt->p_filesz);
743 if (retval != elf_ppnt->p_filesz) {
744 if (retval >= 0)
745 retval = -EIO;
746 goto out_free_interp;
747 }
748
749 retval = -ENOEXEC;
750 if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
751 goto out_free_interp;
752
753 interpreter = open_exec(elf_interpreter);
754 retval = PTR_ERR(interpreter);
755 if (IS_ERR(interpreter))
756 goto out_free_interp;
757
758
759
760
761
762
763 would_dump(bprm, interpreter);
764
765
766 retval = kernel_read(interpreter, 0,
767 (void *)&loc->interp_elf_ex,
768 sizeof(loc->interp_elf_ex));
769 if (retval != sizeof(loc->interp_elf_ex)) {
770 if (retval >= 0)
771 retval = -EIO;
772 goto out_free_dentry;
773 }
774
775 break;
776 }
777 elf_ppnt++;
778 }
779
780 elf_ppnt = elf_phdata;
781 for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++)
782 switch (elf_ppnt->p_type) {
783 case PT_GNU_STACK:
784 if (elf_ppnt->p_flags & PF_X)
785 executable_stack = EXSTACK_ENABLE_X;
786 else
787 executable_stack = EXSTACK_DISABLE_X;
788 break;
789
790 case PT_LOPROC ... PT_HIPROC:
791 retval = arch_elf_pt_proc(&loc->elf_ex, elf_ppnt,
792 bprm->file, false,
793 &arch_state);
794 if (retval)
795 goto out_free_dentry;
796 break;
797 }
798
799
800 if (elf_interpreter) {
801 retval = -ELIBBAD;
802
803 if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
804 goto out_free_dentry;
805
806 if (!elf_check_arch(&loc->interp_elf_ex))
807 goto out_free_dentry;
808
809
810 interp_elf_phdata = load_elf_phdrs(&loc->interp_elf_ex,
811 interpreter);
812 if (!interp_elf_phdata)
813 goto out_free_dentry;
814
815
816 elf_ppnt = interp_elf_phdata;
817 for (i = 0; i < loc->interp_elf_ex.e_phnum; i++, elf_ppnt++)
818 switch (elf_ppnt->p_type) {
819 case PT_LOPROC ... PT_HIPROC:
820 retval = arch_elf_pt_proc(&loc->interp_elf_ex,
821 elf_ppnt, interpreter,
822 true, &arch_state);
823 if (retval)
824 goto out_free_dentry;
825 break;
826 }
827 }
828
829
830
831
832
833
834 retval = arch_check_elf(&loc->elf_ex,
835 !!interpreter, &loc->interp_elf_ex,
836 &arch_state);
837 if (retval)
838 goto out_free_dentry;
839
840
841 retval = flush_old_exec(bprm);
842 if (retval)
843 goto out_free_dentry;
844
845
846
847 SET_PERSONALITY2(loc->elf_ex, &arch_state);
848 if (elf_read_implies_exec(loc->elf_ex, executable_stack))
849 current->personality |= READ_IMPLIES_EXEC;
850
851 if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
852 current->flags |= PF_RANDOMIZE;
853
854 setup_new_exec(bprm);
855
856
857
858 retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP),
859 executable_stack);
860 if (retval < 0)
861 goto out_free_dentry;
862
863 current->mm->start_stack = bprm->p;
864
865
866
867 for(i = 0, elf_ppnt = elf_phdata;
868 i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
869 int elf_prot = 0, elf_flags;
870 unsigned long k, vaddr;
871 unsigned long total_size = 0;
872
873 if (elf_ppnt->p_type != PT_LOAD)
874 continue;
875
876 if (unlikely (elf_brk > elf_bss)) {
877 unsigned long nbyte;
878
879
880
881
882 retval = set_brk(elf_bss + load_bias,
883 elf_brk + load_bias);
884 if (retval)
885 goto out_free_dentry;
886 nbyte = ELF_PAGEOFFSET(elf_bss);
887 if (nbyte) {
888 nbyte = ELF_MIN_ALIGN - nbyte;
889 if (nbyte > elf_brk - elf_bss)
890 nbyte = elf_brk - elf_bss;
891 if (clear_user((void __user *)elf_bss +
892 load_bias, nbyte)) {
893
894
895
896
897
898 }
899 }
900 }
901
902 if (elf_ppnt->p_flags & PF_R)
903 elf_prot |= PROT_READ;
904 if (elf_ppnt->p_flags & PF_W)
905 elf_prot |= PROT_WRITE;
906 if (elf_ppnt->p_flags & PF_X)
907 elf_prot |= PROT_EXEC;
908
909 elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE;
910
911 vaddr = elf_ppnt->p_vaddr;
912 if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
913 elf_flags |= MAP_FIXED;
914 } else if (loc->elf_ex.e_type == ET_DYN) {
915
916
917
918
919 load_bias = ELF_ET_DYN_BASE - vaddr;
920 if (current->flags & PF_RANDOMIZE)
921 load_bias += arch_mmap_rnd();
922 load_bias = ELF_PAGESTART(load_bias);
923 total_size = total_mapping_size(elf_phdata,
924 loc->elf_ex.e_phnum);
925 if (!total_size) {
926 retval = -EINVAL;
927 goto out_free_dentry;
928 }
929 }
930
931 error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
932 elf_prot, elf_flags, total_size);
933 if (BAD_ADDR(error)) {
934 retval = IS_ERR((void *)error) ?
935 PTR_ERR((void*)error) : -EINVAL;
936 goto out_free_dentry;
937 }
938
939 if (!load_addr_set) {
940 load_addr_set = 1;
941 load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
942 if (loc->elf_ex.e_type == ET_DYN) {
943 load_bias += error -
944 ELF_PAGESTART(load_bias + vaddr);
945 load_addr += load_bias;
946 reloc_func_desc = load_bias;
947 }
948 }
949 k = elf_ppnt->p_vaddr;
950 if (k < start_code)
951 start_code = k;
952 if (start_data < k)
953 start_data = k;
954
955
956
957
958
959
960 if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
961 elf_ppnt->p_memsz > TASK_SIZE ||
962 TASK_SIZE - elf_ppnt->p_memsz < k) {
963
964 retval = -EINVAL;
965 goto out_free_dentry;
966 }
967
968 k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
969
970 if (k > elf_bss)
971 elf_bss = k;
972 if ((elf_ppnt->p_flags & PF_X) && end_code < k)
973 end_code = k;
974 if (end_data < k)
975 end_data = k;
976 k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
977 if (k > elf_brk)
978 elf_brk = k;
979 }
980
981 loc->elf_ex.e_entry += load_bias;
982 elf_bss += load_bias;
983 elf_brk += load_bias;
984 start_code += load_bias;
985 end_code += load_bias;
986 start_data += load_bias;
987 end_data += load_bias;
988
989
990
991
992
993
994 retval = set_brk(elf_bss, elf_brk);
995 if (retval)
996 goto out_free_dentry;
997 if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) {
998 retval = -EFAULT;
999 goto out_free_dentry;
1000 }
1001
1002 if (elf_interpreter) {
1003 unsigned long interp_map_addr = 0;
1004
1005 elf_entry = load_elf_interp(&loc->interp_elf_ex,
1006 interpreter,
1007 &interp_map_addr,
1008 load_bias, interp_elf_phdata);
1009 if (!IS_ERR((void *)elf_entry)) {
1010
1011
1012
1013
1014 interp_load_addr = elf_entry;
1015 elf_entry += loc->interp_elf_ex.e_entry;
1016 }
1017 if (BAD_ADDR(elf_entry)) {
1018 retval = IS_ERR((void *)elf_entry) ?
1019 (int)elf_entry : -EINVAL;
1020 goto out_free_dentry;
1021 }
1022 reloc_func_desc = interp_load_addr;
1023
1024 allow_write_access(interpreter);
1025 fput(interpreter);
1026 kfree(elf_interpreter);
1027 } else {
1028 elf_entry = loc->elf_ex.e_entry;
1029 if (BAD_ADDR(elf_entry)) {
1030 retval = -EINVAL;
1031 goto out_free_dentry;
1032 }
1033 }
1034
1035 kfree(interp_elf_phdata);
1036 kfree(elf_phdata);
1037
1038 set_binfmt(&elf_format);
1039
1040#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
1041 retval = arch_setup_additional_pages(bprm, !!elf_interpreter);
1042 if (retval < 0)
1043 goto out;
1044#endif
1045
1046 install_exec_creds(bprm);
1047 retval = create_elf_tables(bprm, &loc->elf_ex,
1048 load_addr, interp_load_addr);
1049 if (retval < 0)
1050 goto out;
1051
1052 current->mm->end_code = end_code;
1053 current->mm->start_code = start_code;
1054 current->mm->start_data = start_data;
1055 current->mm->end_data = end_data;
1056 current->mm->start_stack = bprm->p;
1057
1058 if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) {
1059 current->mm->brk = current->mm->start_brk =
1060 arch_randomize_brk(current->mm);
1061#ifdef compat_brk_randomized
1062 current->brk_randomized = 1;
1063#endif
1064 }
1065
1066 if (current->personality & MMAP_PAGE_ZERO) {
1067
1068
1069
1070
1071 error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
1072 MAP_FIXED | MAP_PRIVATE, 0);
1073 }
1074
1075#ifdef ELF_PLAT_INIT
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086 ELF_PLAT_INIT(regs, reloc_func_desc);
1087#endif
1088
1089 start_thread(regs, elf_entry, bprm->p);
1090 retval = 0;
1091out:
1092 kfree(loc);
1093out_ret:
1094 return retval;
1095
1096
1097out_free_dentry:
1098 kfree(interp_elf_phdata);
1099 allow_write_access(interpreter);
1100 if (interpreter)
1101 fput(interpreter);
1102out_free_interp:
1103 kfree(elf_interpreter);
1104out_free_ph:
1105 kfree(elf_phdata);
1106 goto out;
1107}
1108
1109#ifdef CONFIG_USELIB
1110
1111
1112static int load_elf_library(struct file *file)
1113{
1114 struct elf_phdr *elf_phdata;
1115 struct elf_phdr *eppnt;
1116 unsigned long elf_bss, bss, len;
1117 int retval, error, i, j;
1118 struct elfhdr elf_ex;
1119
1120 error = -ENOEXEC;
1121 retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex));
1122 if (retval != sizeof(elf_ex))
1123 goto out;
1124
1125 if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
1126 goto out;
1127
1128
1129 if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
1130 !elf_check_arch(&elf_ex) || !file->f_op->mmap)
1131 goto out;
1132
1133
1134
1135 j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
1136
1137
1138 error = -ENOMEM;
1139 elf_phdata = kmalloc(j, GFP_KERNEL);
1140 if (!elf_phdata)
1141 goto out;
1142
1143 eppnt = elf_phdata;
1144 error = -ENOEXEC;
1145 retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j);
1146 if (retval != j)
1147 goto out_free_ph;
1148
1149 for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
1150 if ((eppnt + i)->p_type == PT_LOAD)
1151 j++;
1152 if (j != 1)
1153 goto out_free_ph;
1154
1155 while (eppnt->p_type != PT_LOAD)
1156 eppnt++;
1157
1158
1159 error = vm_mmap(file,
1160 ELF_PAGESTART(eppnt->p_vaddr),
1161 (eppnt->p_filesz +
1162 ELF_PAGEOFFSET(eppnt->p_vaddr)),
1163 PROT_READ | PROT_WRITE | PROT_EXEC,
1164 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
1165 (eppnt->p_offset -
1166 ELF_PAGEOFFSET(eppnt->p_vaddr)));
1167 if (error != ELF_PAGESTART(eppnt->p_vaddr))
1168 goto out_free_ph;
1169
1170 elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
1171 if (padzero(elf_bss)) {
1172 error = -EFAULT;
1173 goto out_free_ph;
1174 }
1175
1176 len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr +
1177 ELF_MIN_ALIGN - 1);
1178 bss = eppnt->p_memsz + eppnt->p_vaddr;
1179 if (bss > len)
1180 vm_brk(len, bss - len);
1181 error = 0;
1182
1183out_free_ph:
1184 kfree(elf_phdata);
1185out:
1186 return error;
1187}
1188#endif
1189
1190#ifdef CONFIG_ELF_CORE
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206static bool always_dump_vma(struct vm_area_struct *vma)
1207{
1208
1209 if (vma == get_gate_vma(vma->vm_mm))
1210 return true;
1211
1212
1213
1214
1215
1216 if (vma->vm_ops && vma->vm_ops->name && vma->vm_ops->name(vma))
1217 return true;
1218
1219
1220
1221
1222
1223 if (arch_vma_name(vma))
1224 return true;
1225
1226 return false;
1227}
1228
1229
1230
1231
1232static unsigned long vma_dump_size(struct vm_area_struct *vma,
1233 unsigned long mm_flags)
1234{
1235#define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type))
1236
1237
1238 if (always_dump_vma(vma))
1239 goto whole;
1240
1241 if (vma->vm_flags & VM_DONTDUMP)
1242 return 0;
1243
1244
1245 if (vma_is_dax(vma)) {
1246 if ((vma->vm_flags & VM_SHARED) && FILTER(DAX_SHARED))
1247 goto whole;
1248 if (!(vma->vm_flags & VM_SHARED) && FILTER(DAX_PRIVATE))
1249 goto whole;
1250 return 0;
1251 }
1252
1253
1254 if (vma->vm_flags & VM_HUGETLB) {
1255 if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED))
1256 goto whole;
1257 if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE))
1258 goto whole;
1259 return 0;
1260 }
1261
1262
1263 if (vma->vm_flags & VM_IO)
1264 return 0;
1265
1266
1267 if (vma->vm_flags & VM_SHARED) {
1268 if (file_inode(vma->vm_file)->i_nlink == 0 ?
1269 FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED))
1270 goto whole;
1271 return 0;
1272 }
1273
1274
1275 if (vma->anon_vma && FILTER(ANON_PRIVATE))
1276 goto whole;
1277 if (vma->vm_file == NULL)
1278 return 0;
1279
1280 if (FILTER(MAPPED_PRIVATE))
1281 goto whole;
1282
1283
1284
1285
1286
1287
1288 if (FILTER(ELF_HEADERS) &&
1289 vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) {
1290 u32 __user *header = (u32 __user *) vma->vm_start;
1291 u32 word;
1292 mm_segment_t fs = get_fs();
1293
1294
1295
1296 union {
1297 u32 cmp;
1298 char elfmag[SELFMAG];
1299 } magic;
1300 BUILD_BUG_ON(SELFMAG != sizeof word);
1301 magic.elfmag[EI_MAG0] = ELFMAG0;
1302 magic.elfmag[EI_MAG1] = ELFMAG1;
1303 magic.elfmag[EI_MAG2] = ELFMAG2;
1304 magic.elfmag[EI_MAG3] = ELFMAG3;
1305
1306
1307
1308
1309 set_fs(USER_DS);
1310 if (unlikely(get_user(word, header)))
1311 word = 0;
1312 set_fs(fs);
1313 if (word == magic.cmp)
1314 return PAGE_SIZE;
1315 }
1316
1317#undef FILTER
1318
1319 return 0;
1320
1321whole:
1322 return vma->vm_end - vma->vm_start;
1323}
1324
1325
1326struct memelfnote
1327{
1328 const char *name;
1329 int type;
1330 unsigned int datasz;
1331 void *data;
1332};
1333
1334static int notesize(struct memelfnote *en)
1335{
1336 int sz;
1337
1338 sz = sizeof(struct elf_note);
1339 sz += roundup(strlen(en->name) + 1, 4);
1340 sz += roundup(en->datasz, 4);
1341
1342 return sz;
1343}
1344
1345static int writenote(struct memelfnote *men, struct coredump_params *cprm)
1346{
1347 struct elf_note en;
1348 en.n_namesz = strlen(men->name) + 1;
1349 en.n_descsz = men->datasz;
1350 en.n_type = men->type;
1351
1352 return dump_emit(cprm, &en, sizeof(en)) &&
1353 dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&
1354 dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);
1355}
1356
1357static void fill_elf_header(struct elfhdr *elf, int segs,
1358 u16 machine, u32 flags)
1359{
1360 memset(elf, 0, sizeof(*elf));
1361
1362 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1363 elf->e_ident[EI_CLASS] = ELF_CLASS;
1364 elf->e_ident[EI_DATA] = ELF_DATA;
1365 elf->e_ident[EI_VERSION] = EV_CURRENT;
1366 elf->e_ident[EI_OSABI] = ELF_OSABI;
1367
1368 elf->e_type = ET_CORE;
1369 elf->e_machine = machine;
1370 elf->e_version = EV_CURRENT;
1371 elf->e_phoff = sizeof(struct elfhdr);
1372 elf->e_flags = flags;
1373 elf->e_ehsize = sizeof(struct elfhdr);
1374 elf->e_phentsize = sizeof(struct elf_phdr);
1375 elf->e_phnum = segs;
1376
1377 return;
1378}
1379
1380static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1381{
1382 phdr->p_type = PT_NOTE;
1383 phdr->p_offset = offset;
1384 phdr->p_vaddr = 0;
1385 phdr->p_paddr = 0;
1386 phdr->p_filesz = sz;
1387 phdr->p_memsz = 0;
1388 phdr->p_flags = 0;
1389 phdr->p_align = 0;
1390 return;
1391}
1392
1393static void fill_note(struct memelfnote *note, const char *name, int type,
1394 unsigned int sz, void *data)
1395{
1396 note->name = name;
1397 note->type = type;
1398 note->datasz = sz;
1399 note->data = data;
1400 return;
1401}
1402
1403
1404
1405
1406
1407static void fill_prstatus(struct elf_prstatus *prstatus,
1408 struct task_struct *p, long signr)
1409{
1410 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1411 prstatus->pr_sigpend = p->pending.signal.sig[0];
1412 prstatus->pr_sighold = p->blocked.sig[0];
1413 rcu_read_lock();
1414 prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1415 rcu_read_unlock();
1416 prstatus->pr_pid = task_pid_vnr(p);
1417 prstatus->pr_pgrp = task_pgrp_vnr(p);
1418 prstatus->pr_sid = task_session_vnr(p);
1419 if (thread_group_leader(p)) {
1420 struct task_cputime cputime;
1421
1422
1423
1424
1425
1426 thread_group_cputime(p, &cputime);
1427 cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
1428 cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
1429 } else {
1430 cputime_t utime, stime;
1431
1432 task_cputime(p, &utime, &stime);
1433 cputime_to_timeval(utime, &prstatus->pr_utime);
1434 cputime_to_timeval(stime, &prstatus->pr_stime);
1435 }
1436 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1437 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1438}
1439
1440static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1441 struct mm_struct *mm)
1442{
1443 const struct cred *cred;
1444 unsigned int i, len;
1445
1446
1447 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1448
1449 len = mm->arg_end - mm->arg_start;
1450 if (len >= ELF_PRARGSZ)
1451 len = ELF_PRARGSZ-1;
1452 if (copy_from_user(&psinfo->pr_psargs,
1453 (const char __user *)mm->arg_start, len))
1454 return -EFAULT;
1455 for(i = 0; i < len; i++)
1456 if (psinfo->pr_psargs[i] == 0)
1457 psinfo->pr_psargs[i] = ' ';
1458 psinfo->pr_psargs[len] = 0;
1459
1460 rcu_read_lock();
1461 psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1462 rcu_read_unlock();
1463 psinfo->pr_pid = task_pid_vnr(p);
1464 psinfo->pr_pgrp = task_pgrp_vnr(p);
1465 psinfo->pr_sid = task_session_vnr(p);
1466
1467 i = p->state ? ffz(~p->state) + 1 : 0;
1468 psinfo->pr_state = i;
1469 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1470 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1471 psinfo->pr_nice = task_nice(p);
1472 psinfo->pr_flag = p->flags;
1473 rcu_read_lock();
1474 cred = __task_cred(p);
1475 SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
1476 SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
1477 rcu_read_unlock();
1478 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1479
1480 return 0;
1481}
1482
1483static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm)
1484{
1485 elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv;
1486 int i = 0;
1487 do
1488 i += 2;
1489 while (auxv[i - 2] != AT_NULL);
1490 fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);
1491}
1492
1493static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata,
1494 const siginfo_t *siginfo)
1495{
1496 mm_segment_t old_fs = get_fs();
1497 set_fs(KERNEL_DS);
1498 copy_siginfo_to_user((user_siginfo_t __user *) csigdata, siginfo);
1499 set_fs(old_fs);
1500 fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata);
1501}
1502
1503#define MAX_FILE_NOTE_SIZE (4*1024*1024)
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515static int fill_files_note(struct memelfnote *note)
1516{
1517 struct vm_area_struct *vma;
1518 unsigned count, size, names_ofs, remaining, n;
1519 user_long_t *data;
1520 user_long_t *start_end_ofs;
1521 char *name_base, *name_curpos;
1522
1523
1524 count = current->mm->map_count;
1525 size = count * 64;
1526
1527 names_ofs = (2 + 3 * count) * sizeof(data[0]);
1528 alloc:
1529 if (size >= MAX_FILE_NOTE_SIZE)
1530 return -EINVAL;
1531 size = round_up(size, PAGE_SIZE);
1532 data = vmalloc(size);
1533 if (!data)
1534 return -ENOMEM;
1535
1536 start_end_ofs = data + 2;
1537 name_base = name_curpos = ((char *)data) + names_ofs;
1538 remaining = size - names_ofs;
1539 count = 0;
1540 for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
1541 struct file *file;
1542 const char *filename;
1543
1544 file = vma->vm_file;
1545 if (!file)
1546 continue;
1547 filename = file_path(file, name_curpos, remaining);
1548 if (IS_ERR(filename)) {
1549 if (PTR_ERR(filename) == -ENAMETOOLONG) {
1550 vfree(data);
1551 size = size * 5 / 4;
1552 goto alloc;
1553 }
1554 continue;
1555 }
1556
1557
1558
1559 n = (name_curpos + remaining) - filename;
1560 remaining = filename - name_curpos;
1561 memmove(name_curpos, filename, n);
1562 name_curpos += n;
1563
1564 *start_end_ofs++ = vma->vm_start;
1565 *start_end_ofs++ = vma->vm_end;
1566 *start_end_ofs++ = vma->vm_pgoff;
1567 count++;
1568 }
1569
1570
1571 data[0] = count;
1572 data[1] = PAGE_SIZE;
1573
1574
1575
1576
1577 n = current->mm->map_count - count;
1578 if (n != 0) {
1579 unsigned shift_bytes = n * 3 * sizeof(data[0]);
1580 memmove(name_base - shift_bytes, name_base,
1581 name_curpos - name_base);
1582 name_curpos -= shift_bytes;
1583 }
1584
1585 size = name_curpos - (char *)data;
1586 fill_note(note, "CORE", NT_FILE, size, data);
1587 return 0;
1588}
1589
1590#ifdef CORE_DUMP_USE_REGSET
1591#include <linux/regset.h>
1592
1593struct elf_thread_core_info {
1594 struct elf_thread_core_info *next;
1595 struct task_struct *task;
1596 struct elf_prstatus prstatus;
1597 struct memelfnote notes[0];
1598};
1599
1600struct elf_note_info {
1601 struct elf_thread_core_info *thread;
1602 struct memelfnote psinfo;
1603 struct memelfnote signote;
1604 struct memelfnote auxv;
1605 struct memelfnote files;
1606 user_siginfo_t csigdata;
1607 size_t size;
1608 int thread_notes;
1609};
1610
1611
1612
1613
1614
1615
1616static void do_thread_regset_writeback(struct task_struct *task,
1617 const struct user_regset *regset)
1618{
1619 if (regset->writeback)
1620 regset->writeback(task, regset, 1);
1621}
1622
1623#ifndef PR_REG_SIZE
1624#define PR_REG_SIZE(S) sizeof(S)
1625#endif
1626
1627#ifndef PRSTATUS_SIZE
1628#define PRSTATUS_SIZE(S) sizeof(S)
1629#endif
1630
1631#ifndef PR_REG_PTR
1632#define PR_REG_PTR(S) (&((S)->pr_reg))
1633#endif
1634
1635#ifndef SET_PR_FPVALID
1636#define SET_PR_FPVALID(S, V) ((S)->pr_fpvalid = (V))
1637#endif
1638
1639static int fill_thread_core_info(struct elf_thread_core_info *t,
1640 const struct user_regset_view *view,
1641 long signr, size_t *total)
1642{
1643 unsigned int i;
1644
1645
1646
1647
1648
1649
1650
1651 fill_prstatus(&t->prstatus, t->task, signr);
1652 (void) view->regsets[0].get(t->task, &view->regsets[0],
1653 0, PR_REG_SIZE(t->prstatus.pr_reg),
1654 PR_REG_PTR(&t->prstatus), NULL);
1655
1656 fill_note(&t->notes[0], "CORE", NT_PRSTATUS,
1657 PRSTATUS_SIZE(t->prstatus), &t->prstatus);
1658 *total += notesize(&t->notes[0]);
1659
1660 do_thread_regset_writeback(t->task, &view->regsets[0]);
1661
1662
1663
1664
1665
1666
1667 for (i = 1; i < view->n; ++i) {
1668 const struct user_regset *regset = &view->regsets[i];
1669 do_thread_regset_writeback(t->task, regset);
1670 if (regset->core_note_type && regset->get &&
1671 (!regset->active || regset->active(t->task, regset))) {
1672 int ret;
1673 size_t size = regset->n * regset->size;
1674 void *data = kmalloc(size, GFP_KERNEL);
1675 if (unlikely(!data))
1676 return 0;
1677 ret = regset->get(t->task, regset,
1678 0, size, data, NULL);
1679 if (unlikely(ret))
1680 kfree(data);
1681 else {
1682 if (regset->core_note_type != NT_PRFPREG)
1683 fill_note(&t->notes[i], "LINUX",
1684 regset->core_note_type,
1685 size, data);
1686 else {
1687 SET_PR_FPVALID(&t->prstatus, 1);
1688 fill_note(&t->notes[i], "CORE",
1689 NT_PRFPREG, size, data);
1690 }
1691 *total += notesize(&t->notes[i]);
1692 }
1693 }
1694 }
1695
1696 return 1;
1697}
1698
1699static int fill_note_info(struct elfhdr *elf, int phdrs,
1700 struct elf_note_info *info,
1701 const siginfo_t *siginfo, struct pt_regs *regs)
1702{
1703 struct task_struct *dump_task = current;
1704 const struct user_regset_view *view = task_user_regset_view(dump_task);
1705 struct elf_thread_core_info *t;
1706 struct elf_prpsinfo *psinfo;
1707 struct core_thread *ct;
1708 unsigned int i;
1709
1710 info->size = 0;
1711 info->thread = NULL;
1712
1713 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1714 if (psinfo == NULL) {
1715 info->psinfo.data = NULL;
1716 return 0;
1717 }
1718
1719 fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1720
1721
1722
1723
1724 info->thread_notes = 0;
1725 for (i = 0; i < view->n; ++i)
1726 if (view->regsets[i].core_note_type != 0)
1727 ++info->thread_notes;
1728
1729
1730
1731
1732
1733 if (unlikely(info->thread_notes == 0) ||
1734 unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) {
1735 WARN_ON(1);
1736 return 0;
1737 }
1738
1739
1740
1741
1742 fill_elf_header(elf, phdrs,
1743 view->e_machine, view->e_flags);
1744
1745
1746
1747
1748 for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) {
1749 t = kzalloc(offsetof(struct elf_thread_core_info,
1750 notes[info->thread_notes]),
1751 GFP_KERNEL);
1752 if (unlikely(!t))
1753 return 0;
1754
1755 t->task = ct->task;
1756 if (ct->task == dump_task || !info->thread) {
1757 t->next = info->thread;
1758 info->thread = t;
1759 } else {
1760
1761
1762
1763
1764 t->next = info->thread->next;
1765 info->thread->next = t;
1766 }
1767 }
1768
1769
1770
1771
1772 for (t = info->thread; t != NULL; t = t->next)
1773 if (!fill_thread_core_info(t, view, siginfo->si_signo, &info->size))
1774 return 0;
1775
1776
1777
1778
1779 fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm);
1780 info->size += notesize(&info->psinfo);
1781
1782 fill_siginfo_note(&info->signote, &info->csigdata, siginfo);
1783 info->size += notesize(&info->signote);
1784
1785 fill_auxv_note(&info->auxv, current->mm);
1786 info->size += notesize(&info->auxv);
1787
1788 if (fill_files_note(&info->files) == 0)
1789 info->size += notesize(&info->files);
1790
1791 return 1;
1792}
1793
1794static size_t get_note_info_size(struct elf_note_info *info)
1795{
1796 return info->size;
1797}
1798
1799
1800
1801
1802
1803static int write_note_info(struct elf_note_info *info,
1804 struct coredump_params *cprm)
1805{
1806 bool first = true;
1807 struct elf_thread_core_info *t = info->thread;
1808
1809 do {
1810 int i;
1811
1812 if (!writenote(&t->notes[0], cprm))
1813 return 0;
1814
1815 if (first && !writenote(&info->psinfo, cprm))
1816 return 0;
1817 if (first && !writenote(&info->signote, cprm))
1818 return 0;
1819 if (first && !writenote(&info->auxv, cprm))
1820 return 0;
1821 if (first && info->files.data &&
1822 !writenote(&info->files, cprm))
1823 return 0;
1824
1825 for (i = 1; i < info->thread_notes; ++i)
1826 if (t->notes[i].data &&
1827 !writenote(&t->notes[i], cprm))
1828 return 0;
1829
1830 first = false;
1831 t = t->next;
1832 } while (t);
1833
1834 return 1;
1835}
1836
1837static void free_note_info(struct elf_note_info *info)
1838{
1839 struct elf_thread_core_info *threads = info->thread;
1840 while (threads) {
1841 unsigned int i;
1842 struct elf_thread_core_info *t = threads;
1843 threads = t->next;
1844 WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus);
1845 for (i = 1; i < info->thread_notes; ++i)
1846 kfree(t->notes[i].data);
1847 kfree(t);
1848 }
1849 kfree(info->psinfo.data);
1850 vfree(info->files.data);
1851}
1852
1853#else
1854
1855
1856struct elf_thread_status
1857{
1858 struct list_head list;
1859 struct elf_prstatus prstatus;
1860 elf_fpregset_t fpu;
1861 struct task_struct *thread;
1862#ifdef ELF_CORE_COPY_XFPREGS
1863 elf_fpxregset_t xfpu;
1864#endif
1865 struct memelfnote notes[3];
1866 int num_notes;
1867};
1868
1869
1870
1871
1872
1873
1874static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1875{
1876 int sz = 0;
1877 struct task_struct *p = t->thread;
1878 t->num_notes = 0;
1879
1880 fill_prstatus(&t->prstatus, p, signr);
1881 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1882
1883 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1884 &(t->prstatus));
1885 t->num_notes++;
1886 sz += notesize(&t->notes[0]);
1887
1888 if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL,
1889 &t->fpu))) {
1890 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1891 &(t->fpu));
1892 t->num_notes++;
1893 sz += notesize(&t->notes[1]);
1894 }
1895
1896#ifdef ELF_CORE_COPY_XFPREGS
1897 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1898 fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
1899 sizeof(t->xfpu), &t->xfpu);
1900 t->num_notes++;
1901 sz += notesize(&t->notes[2]);
1902 }
1903#endif
1904 return sz;
1905}
1906
1907struct elf_note_info {
1908 struct memelfnote *notes;
1909 struct memelfnote *notes_files;
1910 struct elf_prstatus *prstatus;
1911 struct elf_prpsinfo *psinfo;
1912 struct list_head thread_list;
1913 elf_fpregset_t *fpu;
1914#ifdef ELF_CORE_COPY_XFPREGS
1915 elf_fpxregset_t *xfpu;
1916#endif
1917 user_siginfo_t csigdata;
1918 int thread_status_size;
1919 int numnote;
1920};
1921
1922static int elf_note_info_init(struct elf_note_info *info)
1923{
1924 memset(info, 0, sizeof(*info));
1925 INIT_LIST_HEAD(&info->thread_list);
1926
1927
1928 info->notes = kmalloc(8 * sizeof(struct memelfnote), GFP_KERNEL);
1929 if (!info->notes)
1930 return 0;
1931 info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
1932 if (!info->psinfo)
1933 return 0;
1934 info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL);
1935 if (!info->prstatus)
1936 return 0;
1937 info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
1938 if (!info->fpu)
1939 return 0;
1940#ifdef ELF_CORE_COPY_XFPREGS
1941 info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL);
1942 if (!info->xfpu)
1943 return 0;
1944#endif
1945 return 1;
1946}
1947
1948static int fill_note_info(struct elfhdr *elf, int phdrs,
1949 struct elf_note_info *info,
1950 const siginfo_t *siginfo, struct pt_regs *regs)
1951{
1952 struct list_head *t;
1953 struct core_thread *ct;
1954 struct elf_thread_status *ets;
1955
1956 if (!elf_note_info_init(info))
1957 return 0;
1958
1959 for (ct = current->mm->core_state->dumper.next;
1960 ct; ct = ct->next) {
1961 ets = kzalloc(sizeof(*ets), GFP_KERNEL);
1962 if (!ets)
1963 return 0;
1964
1965 ets->thread = ct->task;
1966 list_add(&ets->list, &info->thread_list);
1967 }
1968
1969 list_for_each(t, &info->thread_list) {
1970 int sz;
1971
1972 ets = list_entry(t, struct elf_thread_status, list);
1973 sz = elf_dump_thread_status(siginfo->si_signo, ets);
1974 info->thread_status_size += sz;
1975 }
1976
1977 memset(info->prstatus, 0, sizeof(*info->prstatus));
1978 fill_prstatus(info->prstatus, current, siginfo->si_signo);
1979 elf_core_copy_regs(&info->prstatus->pr_reg, regs);
1980
1981
1982 fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS);
1983
1984
1985
1986
1987
1988
1989 fill_note(info->notes + 0, "CORE", NT_PRSTATUS,
1990 sizeof(*info->prstatus), info->prstatus);
1991 fill_psinfo(info->psinfo, current->group_leader, current->mm);
1992 fill_note(info->notes + 1, "CORE", NT_PRPSINFO,
1993 sizeof(*info->psinfo), info->psinfo);
1994
1995 fill_siginfo_note(info->notes + 2, &info->csigdata, siginfo);
1996 fill_auxv_note(info->notes + 3, current->mm);
1997 info->numnote = 4;
1998
1999 if (fill_files_note(info->notes + info->numnote) == 0) {
2000 info->notes_files = info->notes + info->numnote;
2001 info->numnote++;
2002 }
2003
2004
2005 info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs,
2006 info->fpu);
2007 if (info->prstatus->pr_fpvalid)
2008 fill_note(info->notes + info->numnote++,
2009 "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu);
2010#ifdef ELF_CORE_COPY_XFPREGS
2011 if (elf_core_copy_task_xfpregs(current, info->xfpu))
2012 fill_note(info->notes + info->numnote++,
2013 "LINUX", ELF_CORE_XFPREG_TYPE,
2014 sizeof(*info->xfpu), info->xfpu);
2015#endif
2016
2017 return 1;
2018}
2019
2020static size_t get_note_info_size(struct elf_note_info *info)
2021{
2022 int sz = 0;
2023 int i;
2024
2025 for (i = 0; i < info->numnote; i++)
2026 sz += notesize(info->notes + i);
2027
2028 sz += info->thread_status_size;
2029
2030 return sz;
2031}
2032
2033static int write_note_info(struct elf_note_info *info,
2034 struct coredump_params *cprm)
2035{
2036 int i;
2037 struct list_head *t;
2038
2039 for (i = 0; i < info->numnote; i++)
2040 if (!writenote(info->notes + i, cprm))
2041 return 0;
2042
2043
2044 list_for_each(t, &info->thread_list) {
2045 struct elf_thread_status *tmp =
2046 list_entry(t, struct elf_thread_status, list);
2047
2048 for (i = 0; i < tmp->num_notes; i++)
2049 if (!writenote(&tmp->notes[i], cprm))
2050 return 0;
2051 }
2052
2053 return 1;
2054}
2055
2056static void free_note_info(struct elf_note_info *info)
2057{
2058 while (!list_empty(&info->thread_list)) {
2059 struct list_head *tmp = info->thread_list.next;
2060 list_del(tmp);
2061 kfree(list_entry(tmp, struct elf_thread_status, list));
2062 }
2063
2064
2065 if (info->notes_files)
2066 vfree(info->notes_files->data);
2067
2068 kfree(info->prstatus);
2069 kfree(info->psinfo);
2070 kfree(info->notes);
2071 kfree(info->fpu);
2072#ifdef ELF_CORE_COPY_XFPREGS
2073 kfree(info->xfpu);
2074#endif
2075}
2076
2077#endif
2078
2079static struct vm_area_struct *first_vma(struct task_struct *tsk,
2080 struct vm_area_struct *gate_vma)
2081{
2082 struct vm_area_struct *ret = tsk->mm->mmap;
2083
2084 if (ret)
2085 return ret;
2086 return gate_vma;
2087}
2088
2089
2090
2091
2092static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
2093 struct vm_area_struct *gate_vma)
2094{
2095 struct vm_area_struct *ret;
2096
2097 ret = this_vma->vm_next;
2098 if (ret)
2099 return ret;
2100 if (this_vma == gate_vma)
2101 return NULL;
2102 return gate_vma;
2103}
2104
2105static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
2106 elf_addr_t e_shoff, int segs)
2107{
2108 elf->e_shoff = e_shoff;
2109 elf->e_shentsize = sizeof(*shdr4extnum);
2110 elf->e_shnum = 1;
2111 elf->e_shstrndx = SHN_UNDEF;
2112
2113 memset(shdr4extnum, 0, sizeof(*shdr4extnum));
2114
2115 shdr4extnum->sh_type = SHT_NULL;
2116 shdr4extnum->sh_size = elf->e_shnum;
2117 shdr4extnum->sh_link = elf->e_shstrndx;
2118 shdr4extnum->sh_info = segs;
2119}
2120
2121
2122
2123
2124
2125
2126
2127
2128static int elf_core_dump(struct coredump_params *cprm)
2129{
2130 int has_dumped = 0;
2131 mm_segment_t fs;
2132 int segs, i;
2133 size_t vma_data_size = 0;
2134 struct vm_area_struct *vma, *gate_vma;
2135 struct elfhdr *elf = NULL;
2136 loff_t offset = 0, dataoff;
2137 struct elf_note_info info = { };
2138 struct elf_phdr *phdr4note = NULL;
2139 struct elf_shdr *shdr4extnum = NULL;
2140 Elf_Half e_phnum;
2141 elf_addr_t e_shoff;
2142 elf_addr_t *vma_filesz = NULL;
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
2158 if (!elf)
2159 goto out;
2160
2161
2162
2163
2164 segs = current->mm->map_count;
2165 segs += elf_core_extra_phdrs();
2166
2167 gate_vma = get_gate_vma(current->mm);
2168 if (gate_vma != NULL)
2169 segs++;
2170
2171
2172 segs++;
2173
2174
2175
2176
2177 e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
2178
2179
2180
2181
2182
2183 if (!fill_note_info(elf, e_phnum, &info, cprm->siginfo, cprm->regs))
2184 goto cleanup;
2185
2186 has_dumped = 1;
2187
2188 fs = get_fs();
2189 set_fs(KERNEL_DS);
2190
2191 offset += sizeof(*elf);
2192 offset += segs * sizeof(struct elf_phdr);
2193
2194
2195 {
2196 size_t sz = get_note_info_size(&info);
2197
2198 sz += elf_coredump_extra_notes_size();
2199
2200 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
2201 if (!phdr4note)
2202 goto end_coredump;
2203
2204 fill_elf_note_phdr(phdr4note, sz, offset);
2205 offset += sz;
2206 }
2207
2208 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
2209
2210 vma_filesz = kmalloc_array(segs - 1, sizeof(*vma_filesz), GFP_KERNEL);
2211 if (!vma_filesz)
2212 goto end_coredump;
2213
2214 for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
2215 vma = next_vma(vma, gate_vma)) {
2216 unsigned long dump_size;
2217
2218 dump_size = vma_dump_size(vma, cprm->mm_flags);
2219 vma_filesz[i++] = dump_size;
2220 vma_data_size += dump_size;
2221 }
2222
2223 offset += vma_data_size;
2224 offset += elf_core_extra_data_size();
2225 e_shoff = offset;
2226
2227 if (e_phnum == PN_XNUM) {
2228 shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
2229 if (!shdr4extnum)
2230 goto end_coredump;
2231 fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
2232 }
2233
2234 offset = dataoff;
2235
2236 if (!dump_emit(cprm, elf, sizeof(*elf)))
2237 goto end_coredump;
2238
2239 if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note)))
2240 goto end_coredump;
2241
2242
2243 for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
2244 vma = next_vma(vma, gate_vma)) {
2245 struct elf_phdr phdr;
2246
2247 phdr.p_type = PT_LOAD;
2248 phdr.p_offset = offset;
2249 phdr.p_vaddr = vma->vm_start;
2250 phdr.p_paddr = 0;
2251 phdr.p_filesz = vma_filesz[i++];
2252 phdr.p_memsz = vma->vm_end - vma->vm_start;
2253 offset += phdr.p_filesz;
2254 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
2255 if (vma->vm_flags & VM_WRITE)
2256 phdr.p_flags |= PF_W;
2257 if (vma->vm_flags & VM_EXEC)
2258 phdr.p_flags |= PF_X;
2259 phdr.p_align = ELF_EXEC_PAGESIZE;
2260
2261 if (!dump_emit(cprm, &phdr, sizeof(phdr)))
2262 goto end_coredump;
2263 }
2264
2265 if (!elf_core_write_extra_phdrs(cprm, offset))
2266 goto end_coredump;
2267
2268
2269 if (!write_note_info(&info, cprm))
2270 goto end_coredump;
2271
2272 if (elf_coredump_extra_notes_write(cprm))
2273 goto end_coredump;
2274
2275
2276 if (!dump_skip(cprm, dataoff - cprm->written))
2277 goto end_coredump;
2278
2279 for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
2280 vma = next_vma(vma, gate_vma)) {
2281 unsigned long addr;
2282 unsigned long end;
2283
2284 end = vma->vm_start + vma_filesz[i++];
2285
2286 for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) {
2287 struct page *page;
2288 int stop;
2289
2290 page = get_dump_page(addr);
2291 if (page) {
2292 void *kaddr = kmap(page);
2293 stop = !dump_emit(cprm, kaddr, PAGE_SIZE);
2294 kunmap(page);
2295 put_page(page);
2296 } else
2297 stop = !dump_skip(cprm, PAGE_SIZE);
2298 if (stop)
2299 goto end_coredump;
2300 }
2301 }
2302
2303 if (!elf_core_write_extra_data(cprm))
2304 goto end_coredump;
2305
2306 if (e_phnum == PN_XNUM) {
2307 if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum)))
2308 goto end_coredump;
2309 }
2310
2311end_coredump:
2312 set_fs(fs);
2313
2314cleanup:
2315 free_note_info(&info);
2316 kfree(shdr4extnum);
2317 kfree(vma_filesz);
2318 kfree(phdr4note);
2319 kfree(elf);
2320out:
2321 return has_dumped;
2322}
2323
2324#endif
2325
2326static int __init init_elf_binfmt(void)
2327{
2328 register_binfmt(&elf_format);
2329 return 0;
2330}
2331
2332static void __exit exit_elf_binfmt(void)
2333{
2334
2335 unregister_binfmt(&elf_format);
2336}
2337
2338core_initcall(init_elf_binfmt);
2339module_exit(exit_elf_binfmt);
2340MODULE_LICENSE("GPL");
2341