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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 int error = vm_brk(start, end - start);
100 if (error)
101 return error;
102 }
103 current->mm->start_brk = current->mm->brk = end;
104 return 0;
105}
106
107
108
109
110
111
112static int padzero(unsigned long elf_bss)
113{
114 unsigned long nbyte;
115
116 nbyte = ELF_PAGEOFFSET(elf_bss);
117 if (nbyte) {
118 nbyte = ELF_MIN_ALIGN - nbyte;
119 if (clear_user((void __user *) elf_bss, nbyte))
120 return -EFAULT;
121 }
122 return 0;
123}
124
125
126#ifdef CONFIG_STACK_GROWSUP
127#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
128#define STACK_ROUND(sp, items) \
129 ((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
130#define STACK_ALLOC(sp, len) ({ \
131 elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \
132 old_sp; })
133#else
134#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
135#define STACK_ROUND(sp, items) \
136 (((unsigned long) (sp - items)) &~ 15UL)
137#define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
138#endif
139
140#ifndef ELF_BASE_PLATFORM
141
142
143
144
145
146#define ELF_BASE_PLATFORM NULL
147#endif
148
149static int
150create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
151 unsigned long load_addr, unsigned long interp_load_addr)
152{
153 unsigned long p = bprm->p;
154 int argc = bprm->argc;
155 int envc = bprm->envc;
156 elf_addr_t __user *argv;
157 elf_addr_t __user *envp;
158 elf_addr_t __user *sp;
159 elf_addr_t __user *u_platform;
160 elf_addr_t __user *u_base_platform;
161 elf_addr_t __user *u_rand_bytes;
162 const char *k_platform = ELF_PLATFORM;
163 const char *k_base_platform = ELF_BASE_PLATFORM;
164 unsigned char k_rand_bytes[16];
165 int items;
166 elf_addr_t *elf_info;
167 int ei_index = 0;
168 const struct cred *cred = current_cred();
169 struct vm_area_struct *vma;
170
171
172
173
174
175
176
177 p = arch_align_stack(p);
178
179
180
181
182
183
184
185 u_platform = NULL;
186 if (k_platform) {
187 size_t len = strlen(k_platform) + 1;
188
189 u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
190 if (__copy_to_user(u_platform, k_platform, len))
191 return -EFAULT;
192 }
193
194
195
196
197
198 u_base_platform = NULL;
199 if (k_base_platform) {
200 size_t len = strlen(k_base_platform) + 1;
201
202 u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
203 if (__copy_to_user(u_base_platform, k_base_platform, len))
204 return -EFAULT;
205 }
206
207
208
209
210 get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes));
211 u_rand_bytes = (elf_addr_t __user *)
212 STACK_ALLOC(p, sizeof(k_rand_bytes));
213 if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes)))
214 return -EFAULT;
215
216
217 elf_info = (elf_addr_t *)current->mm->saved_auxv;
218
219#define NEW_AUX_ENT(id, val) \
220 do { \
221 elf_info[ei_index++] = id; \
222 elf_info[ei_index++] = val; \
223 } while (0)
224
225#ifdef ARCH_DLINFO
226
227
228
229
230
231
232 ARCH_DLINFO;
233#endif
234 NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
235 NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE);
236 NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
237 NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff);
238 NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
239 NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
240 NEW_AUX_ENT(AT_BASE, interp_load_addr);
241 NEW_AUX_ENT(AT_FLAGS, 0);
242 NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
243 NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid));
244 NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid));
245 NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid));
246 NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid));
247 NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
248 NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes);
249#ifdef ELF_HWCAP2
250 NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);
251#endif
252 NEW_AUX_ENT(AT_EXECFN, bprm->exec);
253 if (k_platform) {
254 NEW_AUX_ENT(AT_PLATFORM,
255 (elf_addr_t)(unsigned long)u_platform);
256 }
257 if (k_base_platform) {
258 NEW_AUX_ENT(AT_BASE_PLATFORM,
259 (elf_addr_t)(unsigned long)u_base_platform);
260 }
261 if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
262 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
263 }
264#undef NEW_AUX_ENT
265
266 memset(&elf_info[ei_index], 0,
267 sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]);
268
269
270 ei_index += 2;
271
272 sp = STACK_ADD(p, ei_index);
273
274 items = (argc + 1) + (envc + 1) + 1;
275 bprm->p = STACK_ROUND(sp, items);
276
277
278#ifdef CONFIG_STACK_GROWSUP
279 sp = (elf_addr_t __user *)bprm->p - items - ei_index;
280 bprm->exec = (unsigned long)sp;
281#else
282 sp = (elf_addr_t __user *)bprm->p;
283#endif
284
285
286
287
288
289
290 vma = find_extend_vma(current->mm, bprm->p);
291 if (!vma)
292 return -EFAULT;
293
294
295 if (__put_user(argc, sp++))
296 return -EFAULT;
297 argv = sp;
298 envp = argv + argc + 1;
299
300
301 p = current->mm->arg_end = current->mm->arg_start;
302 while (argc-- > 0) {
303 size_t len;
304 if (__put_user((elf_addr_t)p, argv++))
305 return -EFAULT;
306 len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
307 if (!len || len > MAX_ARG_STRLEN)
308 return -EINVAL;
309 p += len;
310 }
311 if (__put_user(0, argv))
312 return -EFAULT;
313 current->mm->arg_end = current->mm->env_start = p;
314 while (envc-- > 0) {
315 size_t len;
316 if (__put_user((elf_addr_t)p, envp++))
317 return -EFAULT;
318 len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
319 if (!len || len > MAX_ARG_STRLEN)
320 return -EINVAL;
321 p += len;
322 }
323 if (__put_user(0, envp))
324 return -EFAULT;
325 current->mm->env_end = p;
326
327
328 sp = (elf_addr_t __user *)envp + 1;
329 if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t)))
330 return -EFAULT;
331 return 0;
332}
333
334#ifndef elf_map
335
336static unsigned long elf_map(struct file *filep, unsigned long addr,
337 struct elf_phdr *eppnt, int prot, int type,
338 unsigned long total_size)
339{
340 unsigned long map_addr;
341 unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr);
342 unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr);
343 addr = ELF_PAGESTART(addr);
344 size = ELF_PAGEALIGN(size);
345
346
347
348 if (!size)
349 return addr;
350
351
352
353
354
355
356
357
358
359 if (total_size) {
360 total_size = ELF_PAGEALIGN(total_size);
361 map_addr = vm_mmap(filep, addr, total_size, prot, type, off);
362 if (!BAD_ADDR(map_addr))
363 vm_munmap(map_addr+size, total_size-size);
364 } else
365 map_addr = vm_mmap(filep, addr, size, prot, type, off);
366
367 return(map_addr);
368}
369
370#endif
371
372static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr)
373{
374 int i, first_idx = -1, last_idx = -1;
375
376 for (i = 0; i < nr; i++) {
377 if (cmds[i].p_type == PT_LOAD) {
378 last_idx = i;
379 if (first_idx == -1)
380 first_idx = i;
381 }
382 }
383 if (first_idx == -1)
384 return 0;
385
386 return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz -
387 ELF_PAGESTART(cmds[first_idx].p_vaddr);
388}
389
390
391
392
393
394
395
396
397
398
399static struct elf_phdr *load_elf_phdrs(struct elfhdr *elf_ex,
400 struct file *elf_file)
401{
402 struct elf_phdr *elf_phdata = NULL;
403 int retval, size, err = -1;
404
405
406
407
408
409 if (elf_ex->e_phentsize != sizeof(struct elf_phdr))
410 goto out;
411
412
413 if (elf_ex->e_phnum < 1 ||
414 elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr))
415 goto out;
416
417
418 size = sizeof(struct elf_phdr) * elf_ex->e_phnum;
419 if (size > ELF_MIN_ALIGN)
420 goto out;
421
422 elf_phdata = kmalloc(size, GFP_KERNEL);
423 if (!elf_phdata)
424 goto out;
425
426
427 retval = kernel_read(elf_file, elf_ex->e_phoff,
428 (char *)elf_phdata, size);
429 if (retval != size) {
430 err = (retval < 0) ? retval : -EIO;
431 goto out;
432 }
433
434
435 err = 0;
436out:
437 if (err) {
438 kfree(elf_phdata);
439 elf_phdata = NULL;
440 }
441 return elf_phdata;
442}
443
444#ifndef CONFIG_ARCH_BINFMT_ELF_STATE
445
446
447
448
449
450
451
452
453
454
455
456
457struct arch_elf_state {
458};
459
460#define INIT_ARCH_ELF_STATE {}
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480static inline int arch_elf_pt_proc(struct elfhdr *ehdr,
481 struct elf_phdr *phdr,
482 struct file *elf, bool is_interp,
483 struct arch_elf_state *state)
484{
485
486 return 0;
487}
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504static inline int arch_check_elf(struct elfhdr *ehdr, bool has_interp,
505 struct elfhdr *interp_ehdr,
506 struct arch_elf_state *state)
507{
508
509 return 0;
510}
511
512#endif
513
514
515
516
517
518
519static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
520 struct file *interpreter, unsigned long *interp_map_addr,
521 unsigned long no_base, struct elf_phdr *interp_elf_phdata)
522{
523 struct elf_phdr *eppnt;
524 unsigned long load_addr = 0;
525 int load_addr_set = 0;
526 unsigned long last_bss = 0, elf_bss = 0;
527 unsigned long error = ~0UL;
528 unsigned long total_size;
529 int i;
530
531
532 if (interp_elf_ex->e_type != ET_EXEC &&
533 interp_elf_ex->e_type != ET_DYN)
534 goto out;
535 if (!elf_check_arch(interp_elf_ex))
536 goto out;
537 if (!interpreter->f_op->mmap)
538 goto out;
539
540 total_size = total_mapping_size(interp_elf_phdata,
541 interp_elf_ex->e_phnum);
542 if (!total_size) {
543 error = -EINVAL;
544 goto out;
545 }
546
547 eppnt = interp_elf_phdata;
548 for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
549 if (eppnt->p_type == PT_LOAD) {
550 int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
551 int elf_prot = 0;
552 unsigned long vaddr = 0;
553 unsigned long k, map_addr;
554
555 if (eppnt->p_flags & PF_R)
556 elf_prot = PROT_READ;
557 if (eppnt->p_flags & PF_W)
558 elf_prot |= PROT_WRITE;
559 if (eppnt->p_flags & PF_X)
560 elf_prot |= PROT_EXEC;
561 vaddr = eppnt->p_vaddr;
562 if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
563 elf_type |= MAP_FIXED;
564 else if (no_base && interp_elf_ex->e_type == ET_DYN)
565 load_addr = -vaddr;
566
567 map_addr = elf_map(interpreter, load_addr + vaddr,
568 eppnt, elf_prot, elf_type, total_size);
569 total_size = 0;
570 if (!*interp_map_addr)
571 *interp_map_addr = map_addr;
572 error = map_addr;
573 if (BAD_ADDR(map_addr))
574 goto out;
575
576 if (!load_addr_set &&
577 interp_elf_ex->e_type == ET_DYN) {
578 load_addr = map_addr - ELF_PAGESTART(vaddr);
579 load_addr_set = 1;
580 }
581
582
583
584
585
586
587 k = load_addr + eppnt->p_vaddr;
588 if (BAD_ADDR(k) ||
589 eppnt->p_filesz > eppnt->p_memsz ||
590 eppnt->p_memsz > TASK_SIZE ||
591 TASK_SIZE - eppnt->p_memsz < k) {
592 error = -ENOMEM;
593 goto out;
594 }
595
596
597
598
599
600 k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
601 if (k > elf_bss)
602 elf_bss = k;
603
604
605
606
607
608 k = load_addr + eppnt->p_vaddr + eppnt->p_memsz;
609 if (k > last_bss)
610 last_bss = k;
611 }
612 }
613
614
615
616
617
618
619 if (padzero(elf_bss)) {
620 error = -EFAULT;
621 goto out;
622 }
623
624
625
626
627
628 elf_bss = ELF_PAGEALIGN(elf_bss);
629 last_bss = ELF_PAGEALIGN(last_bss);
630
631 if (last_bss > elf_bss) {
632 error = vm_brk(elf_bss, last_bss - elf_bss);
633 if (error)
634 goto out;
635 }
636
637 error = load_addr;
638out:
639 return error;
640}
641
642
643
644
645
646
647#ifndef STACK_RND_MASK
648#define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12))
649#endif
650
651static unsigned long randomize_stack_top(unsigned long stack_top)
652{
653 unsigned long random_variable = 0;
654
655 if ((current->flags & PF_RANDOMIZE) &&
656 !(current->personality & ADDR_NO_RANDOMIZE)) {
657 random_variable = get_random_long();
658 random_variable &= STACK_RND_MASK;
659 random_variable <<= PAGE_SHIFT;
660 }
661#ifdef CONFIG_STACK_GROWSUP
662 return PAGE_ALIGN(stack_top) + random_variable;
663#else
664 return PAGE_ALIGN(stack_top) - random_variable;
665#endif
666}
667
668static int load_elf_binary(struct linux_binprm *bprm)
669{
670 struct file *interpreter = NULL;
671 unsigned long load_addr = 0, load_bias = 0;
672 int load_addr_set = 0;
673 char * elf_interpreter = NULL;
674 unsigned long error;
675 struct elf_phdr *elf_ppnt, *elf_phdata, *interp_elf_phdata = NULL;
676 unsigned long elf_bss, elf_brk;
677 int retval, i;
678 unsigned long elf_entry;
679 unsigned long interp_load_addr = 0;
680 unsigned long start_code, end_code, start_data, end_data;
681 unsigned long reloc_func_desc __maybe_unused = 0;
682 int executable_stack = EXSTACK_DEFAULT;
683 struct pt_regs *regs = current_pt_regs();
684 struct {
685 struct elfhdr elf_ex;
686 struct elfhdr interp_elf_ex;
687 } *loc;
688 struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE;
689
690 loc = kmalloc(sizeof(*loc), GFP_KERNEL);
691 if (!loc) {
692 retval = -ENOMEM;
693 goto out_ret;
694 }
695
696
697 loc->elf_ex = *((struct elfhdr *)bprm->buf);
698
699 retval = -ENOEXEC;
700
701 if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
702 goto out;
703
704 if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN)
705 goto out;
706 if (!elf_check_arch(&loc->elf_ex))
707 goto out;
708 if (!bprm->file->f_op->mmap)
709 goto out;
710
711 elf_phdata = load_elf_phdrs(&loc->elf_ex, bprm->file);
712 if (!elf_phdata)
713 goto out;
714
715 elf_ppnt = elf_phdata;
716 elf_bss = 0;
717 elf_brk = 0;
718
719 start_code = ~0UL;
720 end_code = 0;
721 start_data = 0;
722 end_data = 0;
723
724 for (i = 0; i < loc->elf_ex.e_phnum; i++) {
725 if (elf_ppnt->p_type == PT_INTERP) {
726
727
728
729
730 retval = -ENOEXEC;
731 if (elf_ppnt->p_filesz > PATH_MAX ||
732 elf_ppnt->p_filesz < 2)
733 goto out_free_ph;
734
735 retval = -ENOMEM;
736 elf_interpreter = kmalloc(elf_ppnt->p_filesz,
737 GFP_KERNEL);
738 if (!elf_interpreter)
739 goto out_free_ph;
740
741 retval = kernel_read(bprm->file, elf_ppnt->p_offset,
742 elf_interpreter,
743 elf_ppnt->p_filesz);
744 if (retval != elf_ppnt->p_filesz) {
745 if (retval >= 0)
746 retval = -EIO;
747 goto out_free_interp;
748 }
749
750 retval = -ENOEXEC;
751 if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
752 goto out_free_interp;
753
754 interpreter = open_exec(elf_interpreter);
755 retval = PTR_ERR(interpreter);
756 if (IS_ERR(interpreter))
757 goto out_free_interp;
758
759
760
761
762
763
764 would_dump(bprm, interpreter);
765
766
767 retval = kernel_read(interpreter, 0,
768 (void *)&loc->interp_elf_ex,
769 sizeof(loc->interp_elf_ex));
770 if (retval != sizeof(loc->interp_elf_ex)) {
771 if (retval >= 0)
772 retval = -EIO;
773 goto out_free_dentry;
774 }
775
776 break;
777 }
778 elf_ppnt++;
779 }
780
781 elf_ppnt = elf_phdata;
782 for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++)
783 switch (elf_ppnt->p_type) {
784 case PT_GNU_STACK:
785 if (elf_ppnt->p_flags & PF_X)
786 executable_stack = EXSTACK_ENABLE_X;
787 else
788 executable_stack = EXSTACK_DISABLE_X;
789 break;
790
791 case PT_LOPROC ... PT_HIPROC:
792 retval = arch_elf_pt_proc(&loc->elf_ex, elf_ppnt,
793 bprm->file, false,
794 &arch_state);
795 if (retval)
796 goto out_free_dentry;
797 break;
798 }
799
800
801 if (elf_interpreter) {
802 retval = -ELIBBAD;
803
804 if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
805 goto out_free_dentry;
806
807 if (!elf_check_arch(&loc->interp_elf_ex))
808 goto out_free_dentry;
809
810
811 interp_elf_phdata = load_elf_phdrs(&loc->interp_elf_ex,
812 interpreter);
813 if (!interp_elf_phdata)
814 goto out_free_dentry;
815
816
817 elf_ppnt = interp_elf_phdata;
818 for (i = 0; i < loc->interp_elf_ex.e_phnum; i++, elf_ppnt++)
819 switch (elf_ppnt->p_type) {
820 case PT_LOPROC ... PT_HIPROC:
821 retval = arch_elf_pt_proc(&loc->interp_elf_ex,
822 elf_ppnt, interpreter,
823 true, &arch_state);
824 if (retval)
825 goto out_free_dentry;
826 break;
827 }
828 }
829
830
831
832
833
834
835 retval = arch_check_elf(&loc->elf_ex,
836 !!interpreter, &loc->interp_elf_ex,
837 &arch_state);
838 if (retval)
839 goto out_free_dentry;
840
841
842 retval = flush_old_exec(bprm);
843 if (retval)
844 goto out_free_dentry;
845
846
847
848 SET_PERSONALITY2(loc->elf_ex, &arch_state);
849 if (elf_read_implies_exec(loc->elf_ex, executable_stack))
850 current->personality |= READ_IMPLIES_EXEC;
851
852 if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
853 current->flags |= PF_RANDOMIZE;
854
855 setup_new_exec(bprm);
856 install_exec_creds(bprm);
857
858
859
860 retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP),
861 executable_stack);
862 if (retval < 0)
863 goto out_free_dentry;
864
865 current->mm->start_stack = bprm->p;
866
867
868
869 for(i = 0, elf_ppnt = elf_phdata;
870 i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
871 int elf_prot = 0, elf_flags;
872 unsigned long k, vaddr;
873 unsigned long total_size = 0;
874
875 if (elf_ppnt->p_type != PT_LOAD)
876 continue;
877
878 if (unlikely (elf_brk > elf_bss)) {
879 unsigned long nbyte;
880
881
882
883
884 retval = set_brk(elf_bss + load_bias,
885 elf_brk + load_bias);
886 if (retval)
887 goto out_free_dentry;
888 nbyte = ELF_PAGEOFFSET(elf_bss);
889 if (nbyte) {
890 nbyte = ELF_MIN_ALIGN - nbyte;
891 if (nbyte > elf_brk - elf_bss)
892 nbyte = elf_brk - elf_bss;
893 if (clear_user((void __user *)elf_bss +
894 load_bias, nbyte)) {
895
896
897
898
899
900 }
901 }
902 }
903
904 if (elf_ppnt->p_flags & PF_R)
905 elf_prot |= PROT_READ;
906 if (elf_ppnt->p_flags & PF_W)
907 elf_prot |= PROT_WRITE;
908 if (elf_ppnt->p_flags & PF_X)
909 elf_prot |= PROT_EXEC;
910
911 elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE;
912
913 vaddr = elf_ppnt->p_vaddr;
914 if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
915 elf_flags |= MAP_FIXED;
916 } else if (loc->elf_ex.e_type == ET_DYN) {
917
918
919
920
921 load_bias = ELF_ET_DYN_BASE - vaddr;
922 if (current->flags & PF_RANDOMIZE)
923 load_bias += arch_mmap_rnd();
924 load_bias = ELF_PAGESTART(load_bias);
925 total_size = total_mapping_size(elf_phdata,
926 loc->elf_ex.e_phnum);
927 if (!total_size) {
928 retval = -EINVAL;
929 goto out_free_dentry;
930 }
931 }
932
933 error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
934 elf_prot, elf_flags, total_size);
935 if (BAD_ADDR(error)) {
936 retval = IS_ERR((void *)error) ?
937 PTR_ERR((void*)error) : -EINVAL;
938 goto out_free_dentry;
939 }
940
941 if (!load_addr_set) {
942 load_addr_set = 1;
943 load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
944 if (loc->elf_ex.e_type == ET_DYN) {
945 load_bias += error -
946 ELF_PAGESTART(load_bias + vaddr);
947 load_addr += load_bias;
948 reloc_func_desc = load_bias;
949 }
950 }
951 k = elf_ppnt->p_vaddr;
952 if (k < start_code)
953 start_code = k;
954 if (start_data < k)
955 start_data = k;
956
957
958
959
960
961
962 if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
963 elf_ppnt->p_memsz > TASK_SIZE ||
964 TASK_SIZE - elf_ppnt->p_memsz < k) {
965
966 retval = -EINVAL;
967 goto out_free_dentry;
968 }
969
970 k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
971
972 if (k > elf_bss)
973 elf_bss = k;
974 if ((elf_ppnt->p_flags & PF_X) && end_code < k)
975 end_code = k;
976 if (end_data < k)
977 end_data = k;
978 k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
979 if (k > elf_brk)
980 elf_brk = k;
981 }
982
983 loc->elf_ex.e_entry += load_bias;
984 elf_bss += load_bias;
985 elf_brk += load_bias;
986 start_code += load_bias;
987 end_code += load_bias;
988 start_data += load_bias;
989 end_data += load_bias;
990
991
992
993
994
995
996 retval = set_brk(elf_bss, elf_brk);
997 if (retval)
998 goto out_free_dentry;
999 if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) {
1000 retval = -EFAULT;
1001 goto out_free_dentry;
1002 }
1003
1004 if (elf_interpreter) {
1005 unsigned long interp_map_addr = 0;
1006
1007 elf_entry = load_elf_interp(&loc->interp_elf_ex,
1008 interpreter,
1009 &interp_map_addr,
1010 load_bias, interp_elf_phdata);
1011 if (!IS_ERR((void *)elf_entry)) {
1012
1013
1014
1015
1016 interp_load_addr = elf_entry;
1017 elf_entry += loc->interp_elf_ex.e_entry;
1018 }
1019 if (BAD_ADDR(elf_entry)) {
1020 retval = IS_ERR((void *)elf_entry) ?
1021 (int)elf_entry : -EINVAL;
1022 goto out_free_dentry;
1023 }
1024 reloc_func_desc = interp_load_addr;
1025
1026 allow_write_access(interpreter);
1027 fput(interpreter);
1028 kfree(elf_interpreter);
1029 } else {
1030 elf_entry = loc->elf_ex.e_entry;
1031 if (BAD_ADDR(elf_entry)) {
1032 retval = -EINVAL;
1033 goto out_free_dentry;
1034 }
1035 }
1036
1037 kfree(interp_elf_phdata);
1038 kfree(elf_phdata);
1039
1040 set_binfmt(&elf_format);
1041
1042#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
1043 retval = arch_setup_additional_pages(bprm, !!elf_interpreter);
1044 if (retval < 0)
1045 goto out;
1046#endif
1047
1048 retval = create_elf_tables(bprm, &loc->elf_ex,
1049 load_addr, interp_load_addr);
1050 if (retval < 0)
1051 goto out;
1052
1053 current->mm->end_code = end_code;
1054 current->mm->start_code = start_code;
1055 current->mm->start_data = start_data;
1056 current->mm->end_data = end_data;
1057 current->mm->start_stack = bprm->p;
1058
1059 if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) {
1060 current->mm->brk = current->mm->start_brk =
1061 arch_randomize_brk(current->mm);
1062#ifdef compat_brk_randomized
1063 current->brk_randomized = 1;
1064#endif
1065 }
1066
1067 if (current->personality & MMAP_PAGE_ZERO) {
1068
1069
1070
1071
1072 error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
1073 MAP_FIXED | MAP_PRIVATE, 0);
1074 }
1075
1076#ifdef ELF_PLAT_INIT
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087 ELF_PLAT_INIT(regs, reloc_func_desc);
1088#endif
1089
1090 start_thread(regs, elf_entry, bprm->p);
1091 retval = 0;
1092out:
1093 kfree(loc);
1094out_ret:
1095 return retval;
1096
1097
1098out_free_dentry:
1099 kfree(interp_elf_phdata);
1100 allow_write_access(interpreter);
1101 if (interpreter)
1102 fput(interpreter);
1103out_free_interp:
1104 kfree(elf_interpreter);
1105out_free_ph:
1106 kfree(elf_phdata);
1107 goto out;
1108}
1109
1110#ifdef CONFIG_USELIB
1111
1112
1113static int load_elf_library(struct file *file)
1114{
1115 struct elf_phdr *elf_phdata;
1116 struct elf_phdr *eppnt;
1117 unsigned long elf_bss, bss, len;
1118 int retval, error, i, j;
1119 struct elfhdr elf_ex;
1120
1121 error = -ENOEXEC;
1122 retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex));
1123 if (retval != sizeof(elf_ex))
1124 goto out;
1125
1126 if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
1127 goto out;
1128
1129
1130 if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
1131 !elf_check_arch(&elf_ex) || !file->f_op->mmap)
1132 goto out;
1133
1134
1135
1136 j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
1137
1138
1139 error = -ENOMEM;
1140 elf_phdata = kmalloc(j, GFP_KERNEL);
1141 if (!elf_phdata)
1142 goto out;
1143
1144 eppnt = elf_phdata;
1145 error = -ENOEXEC;
1146 retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j);
1147 if (retval != j)
1148 goto out_free_ph;
1149
1150 for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
1151 if ((eppnt + i)->p_type == PT_LOAD)
1152 j++;
1153 if (j != 1)
1154 goto out_free_ph;
1155
1156 while (eppnt->p_type != PT_LOAD)
1157 eppnt++;
1158
1159
1160 error = vm_mmap(file,
1161 ELF_PAGESTART(eppnt->p_vaddr),
1162 (eppnt->p_filesz +
1163 ELF_PAGEOFFSET(eppnt->p_vaddr)),
1164 PROT_READ | PROT_WRITE | PROT_EXEC,
1165 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
1166 (eppnt->p_offset -
1167 ELF_PAGEOFFSET(eppnt->p_vaddr)));
1168 if (error != ELF_PAGESTART(eppnt->p_vaddr))
1169 goto out_free_ph;
1170
1171 elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
1172 if (padzero(elf_bss)) {
1173 error = -EFAULT;
1174 goto out_free_ph;
1175 }
1176
1177 len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr +
1178 ELF_MIN_ALIGN - 1);
1179 bss = eppnt->p_memsz + eppnt->p_vaddr;
1180 if (bss > len) {
1181 error = vm_brk(len, bss - len);
1182 if (error)
1183 goto out_free_ph;
1184 }
1185 error = 0;
1186
1187out_free_ph:
1188 kfree(elf_phdata);
1189out:
1190 return error;
1191}
1192#endif
1193
1194#ifdef CONFIG_ELF_CORE
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210static bool always_dump_vma(struct vm_area_struct *vma)
1211{
1212
1213 if (vma == get_gate_vma(vma->vm_mm))
1214 return true;
1215
1216
1217
1218
1219
1220 if (vma->vm_ops && vma->vm_ops->name && vma->vm_ops->name(vma))
1221 return true;
1222
1223
1224
1225
1226
1227 if (arch_vma_name(vma))
1228 return true;
1229
1230 return false;
1231}
1232
1233
1234
1235
1236static unsigned long vma_dump_size(struct vm_area_struct *vma,
1237 unsigned long mm_flags)
1238{
1239#define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type))
1240
1241
1242 if (always_dump_vma(vma))
1243 goto whole;
1244
1245 if (vma->vm_flags & VM_DONTDUMP)
1246 return 0;
1247
1248
1249 if (vma_is_dax(vma)) {
1250 if ((vma->vm_flags & VM_SHARED) && FILTER(DAX_SHARED))
1251 goto whole;
1252 if (!(vma->vm_flags & VM_SHARED) && FILTER(DAX_PRIVATE))
1253 goto whole;
1254 return 0;
1255 }
1256
1257
1258 if (vma->vm_flags & VM_HUGETLB) {
1259 if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED))
1260 goto whole;
1261 if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE))
1262 goto whole;
1263 return 0;
1264 }
1265
1266
1267 if (vma->vm_flags & VM_IO)
1268 return 0;
1269
1270
1271 if (vma->vm_flags & VM_SHARED) {
1272 if (file_inode(vma->vm_file)->i_nlink == 0 ?
1273 FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED))
1274 goto whole;
1275 return 0;
1276 }
1277
1278
1279 if (vma->anon_vma && FILTER(ANON_PRIVATE))
1280 goto whole;
1281 if (vma->vm_file == NULL)
1282 return 0;
1283
1284 if (FILTER(MAPPED_PRIVATE))
1285 goto whole;
1286
1287
1288
1289
1290
1291
1292 if (FILTER(ELF_HEADERS) &&
1293 vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) {
1294 u32 __user *header = (u32 __user *) vma->vm_start;
1295 u32 word;
1296 mm_segment_t fs = get_fs();
1297
1298
1299
1300 union {
1301 u32 cmp;
1302 char elfmag[SELFMAG];
1303 } magic;
1304 BUILD_BUG_ON(SELFMAG != sizeof word);
1305 magic.elfmag[EI_MAG0] = ELFMAG0;
1306 magic.elfmag[EI_MAG1] = ELFMAG1;
1307 magic.elfmag[EI_MAG2] = ELFMAG2;
1308 magic.elfmag[EI_MAG3] = ELFMAG3;
1309
1310
1311
1312
1313 set_fs(USER_DS);
1314 if (unlikely(get_user(word, header)))
1315 word = 0;
1316 set_fs(fs);
1317 if (word == magic.cmp)
1318 return PAGE_SIZE;
1319 }
1320
1321#undef FILTER
1322
1323 return 0;
1324
1325whole:
1326 return vma->vm_end - vma->vm_start;
1327}
1328
1329
1330struct memelfnote
1331{
1332 const char *name;
1333 int type;
1334 unsigned int datasz;
1335 void *data;
1336};
1337
1338static int notesize(struct memelfnote *en)
1339{
1340 int sz;
1341
1342 sz = sizeof(struct elf_note);
1343 sz += roundup(strlen(en->name) + 1, 4);
1344 sz += roundup(en->datasz, 4);
1345
1346 return sz;
1347}
1348
1349static int writenote(struct memelfnote *men, struct coredump_params *cprm)
1350{
1351 struct elf_note en;
1352 en.n_namesz = strlen(men->name) + 1;
1353 en.n_descsz = men->datasz;
1354 en.n_type = men->type;
1355
1356 return dump_emit(cprm, &en, sizeof(en)) &&
1357 dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&
1358 dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);
1359}
1360
1361static void fill_elf_header(struct elfhdr *elf, int segs,
1362 u16 machine, u32 flags)
1363{
1364 memset(elf, 0, sizeof(*elf));
1365
1366 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1367 elf->e_ident[EI_CLASS] = ELF_CLASS;
1368 elf->e_ident[EI_DATA] = ELF_DATA;
1369 elf->e_ident[EI_VERSION] = EV_CURRENT;
1370 elf->e_ident[EI_OSABI] = ELF_OSABI;
1371
1372 elf->e_type = ET_CORE;
1373 elf->e_machine = machine;
1374 elf->e_version = EV_CURRENT;
1375 elf->e_phoff = sizeof(struct elfhdr);
1376 elf->e_flags = flags;
1377 elf->e_ehsize = sizeof(struct elfhdr);
1378 elf->e_phentsize = sizeof(struct elf_phdr);
1379 elf->e_phnum = segs;
1380
1381 return;
1382}
1383
1384static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1385{
1386 phdr->p_type = PT_NOTE;
1387 phdr->p_offset = offset;
1388 phdr->p_vaddr = 0;
1389 phdr->p_paddr = 0;
1390 phdr->p_filesz = sz;
1391 phdr->p_memsz = 0;
1392 phdr->p_flags = 0;
1393 phdr->p_align = 0;
1394 return;
1395}
1396
1397static void fill_note(struct memelfnote *note, const char *name, int type,
1398 unsigned int sz, void *data)
1399{
1400 note->name = name;
1401 note->type = type;
1402 note->datasz = sz;
1403 note->data = data;
1404 return;
1405}
1406
1407
1408
1409
1410
1411static void fill_prstatus(struct elf_prstatus *prstatus,
1412 struct task_struct *p, long signr)
1413{
1414 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1415 prstatus->pr_sigpend = p->pending.signal.sig[0];
1416 prstatus->pr_sighold = p->blocked.sig[0];
1417 rcu_read_lock();
1418 prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1419 rcu_read_unlock();
1420 prstatus->pr_pid = task_pid_vnr(p);
1421 prstatus->pr_pgrp = task_pgrp_vnr(p);
1422 prstatus->pr_sid = task_session_vnr(p);
1423 if (thread_group_leader(p)) {
1424 struct task_cputime cputime;
1425
1426
1427
1428
1429
1430 thread_group_cputime(p, &cputime);
1431 cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
1432 cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
1433 } else {
1434 cputime_t utime, stime;
1435
1436 task_cputime(p, &utime, &stime);
1437 cputime_to_timeval(utime, &prstatus->pr_utime);
1438 cputime_to_timeval(stime, &prstatus->pr_stime);
1439 }
1440 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1441 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1442}
1443
1444static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1445 struct mm_struct *mm)
1446{
1447 const struct cred *cred;
1448 unsigned int i, len;
1449
1450
1451 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1452
1453 len = mm->arg_end - mm->arg_start;
1454 if (len >= ELF_PRARGSZ)
1455 len = ELF_PRARGSZ-1;
1456 if (copy_from_user(&psinfo->pr_psargs,
1457 (const char __user *)mm->arg_start, len))
1458 return -EFAULT;
1459 for(i = 0; i < len; i++)
1460 if (psinfo->pr_psargs[i] == 0)
1461 psinfo->pr_psargs[i] = ' ';
1462 psinfo->pr_psargs[len] = 0;
1463
1464 rcu_read_lock();
1465 psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1466 rcu_read_unlock();
1467 psinfo->pr_pid = task_pid_vnr(p);
1468 psinfo->pr_pgrp = task_pgrp_vnr(p);
1469 psinfo->pr_sid = task_session_vnr(p);
1470
1471 i = p->state ? ffz(~p->state) + 1 : 0;
1472 psinfo->pr_state = i;
1473 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1474 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1475 psinfo->pr_nice = task_nice(p);
1476 psinfo->pr_flag = p->flags;
1477 rcu_read_lock();
1478 cred = __task_cred(p);
1479 SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
1480 SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
1481 rcu_read_unlock();
1482 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1483
1484 return 0;
1485}
1486
1487static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm)
1488{
1489 elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv;
1490 int i = 0;
1491 do
1492 i += 2;
1493 while (auxv[i - 2] != AT_NULL);
1494 fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);
1495}
1496
1497static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata,
1498 const siginfo_t *siginfo)
1499{
1500 mm_segment_t old_fs = get_fs();
1501 set_fs(KERNEL_DS);
1502 copy_siginfo_to_user((user_siginfo_t __user *) csigdata, siginfo);
1503 set_fs(old_fs);
1504 fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata);
1505}
1506
1507#define MAX_FILE_NOTE_SIZE (4*1024*1024)
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519static int fill_files_note(struct memelfnote *note)
1520{
1521 struct vm_area_struct *vma;
1522 unsigned count, size, names_ofs, remaining, n;
1523 user_long_t *data;
1524 user_long_t *start_end_ofs;
1525 char *name_base, *name_curpos;
1526
1527
1528 count = current->mm->map_count;
1529 size = count * 64;
1530
1531 names_ofs = (2 + 3 * count) * sizeof(data[0]);
1532 alloc:
1533 if (size >= MAX_FILE_NOTE_SIZE)
1534 return -EINVAL;
1535 size = round_up(size, PAGE_SIZE);
1536 data = vmalloc(size);
1537 if (!data)
1538 return -ENOMEM;
1539
1540 start_end_ofs = data + 2;
1541 name_base = name_curpos = ((char *)data) + names_ofs;
1542 remaining = size - names_ofs;
1543 count = 0;
1544 for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
1545 struct file *file;
1546 const char *filename;
1547
1548 file = vma->vm_file;
1549 if (!file)
1550 continue;
1551 filename = file_path(file, name_curpos, remaining);
1552 if (IS_ERR(filename)) {
1553 if (PTR_ERR(filename) == -ENAMETOOLONG) {
1554 vfree(data);
1555 size = size * 5 / 4;
1556 goto alloc;
1557 }
1558 continue;
1559 }
1560
1561
1562
1563 n = (name_curpos + remaining) - filename;
1564 remaining = filename - name_curpos;
1565 memmove(name_curpos, filename, n);
1566 name_curpos += n;
1567
1568 *start_end_ofs++ = vma->vm_start;
1569 *start_end_ofs++ = vma->vm_end;
1570 *start_end_ofs++ = vma->vm_pgoff;
1571 count++;
1572 }
1573
1574
1575 data[0] = count;
1576 data[1] = PAGE_SIZE;
1577
1578
1579
1580
1581 n = current->mm->map_count - count;
1582 if (n != 0) {
1583 unsigned shift_bytes = n * 3 * sizeof(data[0]);
1584 memmove(name_base - shift_bytes, name_base,
1585 name_curpos - name_base);
1586 name_curpos -= shift_bytes;
1587 }
1588
1589 size = name_curpos - (char *)data;
1590 fill_note(note, "CORE", NT_FILE, size, data);
1591 return 0;
1592}
1593
1594#ifdef CORE_DUMP_USE_REGSET
1595#include <linux/regset.h>
1596
1597struct elf_thread_core_info {
1598 struct elf_thread_core_info *next;
1599 struct task_struct *task;
1600 struct elf_prstatus prstatus;
1601 struct memelfnote notes[0];
1602};
1603
1604struct elf_note_info {
1605 struct elf_thread_core_info *thread;
1606 struct memelfnote psinfo;
1607 struct memelfnote signote;
1608 struct memelfnote auxv;
1609 struct memelfnote files;
1610 user_siginfo_t csigdata;
1611 size_t size;
1612 int thread_notes;
1613};
1614
1615
1616
1617
1618
1619
1620static void do_thread_regset_writeback(struct task_struct *task,
1621 const struct user_regset *regset)
1622{
1623 if (regset->writeback)
1624 regset->writeback(task, regset, 1);
1625}
1626
1627#ifndef PR_REG_SIZE
1628#define PR_REG_SIZE(S) sizeof(S)
1629#endif
1630
1631#ifndef PRSTATUS_SIZE
1632#define PRSTATUS_SIZE(S) sizeof(S)
1633#endif
1634
1635#ifndef PR_REG_PTR
1636#define PR_REG_PTR(S) (&((S)->pr_reg))
1637#endif
1638
1639#ifndef SET_PR_FPVALID
1640#define SET_PR_FPVALID(S, V) ((S)->pr_fpvalid = (V))
1641#endif
1642
1643static int fill_thread_core_info(struct elf_thread_core_info *t,
1644 const struct user_regset_view *view,
1645 long signr, size_t *total)
1646{
1647 unsigned int i;
1648
1649
1650
1651
1652
1653
1654
1655 fill_prstatus(&t->prstatus, t->task, signr);
1656 (void) view->regsets[0].get(t->task, &view->regsets[0],
1657 0, PR_REG_SIZE(t->prstatus.pr_reg),
1658 PR_REG_PTR(&t->prstatus), NULL);
1659
1660 fill_note(&t->notes[0], "CORE", NT_PRSTATUS,
1661 PRSTATUS_SIZE(t->prstatus), &t->prstatus);
1662 *total += notesize(&t->notes[0]);
1663
1664 do_thread_regset_writeback(t->task, &view->regsets[0]);
1665
1666
1667
1668
1669
1670
1671 for (i = 1; i < view->n; ++i) {
1672 const struct user_regset *regset = &view->regsets[i];
1673 do_thread_regset_writeback(t->task, regset);
1674 if (regset->core_note_type && regset->get &&
1675 (!regset->active || regset->active(t->task, regset))) {
1676 int ret;
1677 size_t size = regset->n * regset->size;
1678 void *data = kmalloc(size, GFP_KERNEL);
1679 if (unlikely(!data))
1680 return 0;
1681 ret = regset->get(t->task, regset,
1682 0, size, data, NULL);
1683 if (unlikely(ret))
1684 kfree(data);
1685 else {
1686 if (regset->core_note_type != NT_PRFPREG)
1687 fill_note(&t->notes[i], "LINUX",
1688 regset->core_note_type,
1689 size, data);
1690 else {
1691 SET_PR_FPVALID(&t->prstatus, 1);
1692 fill_note(&t->notes[i], "CORE",
1693 NT_PRFPREG, size, data);
1694 }
1695 *total += notesize(&t->notes[i]);
1696 }
1697 }
1698 }
1699
1700 return 1;
1701}
1702
1703static int fill_note_info(struct elfhdr *elf, int phdrs,
1704 struct elf_note_info *info,
1705 const siginfo_t *siginfo, struct pt_regs *regs)
1706{
1707 struct task_struct *dump_task = current;
1708 const struct user_regset_view *view = task_user_regset_view(dump_task);
1709 struct elf_thread_core_info *t;
1710 struct elf_prpsinfo *psinfo;
1711 struct core_thread *ct;
1712 unsigned int i;
1713
1714 info->size = 0;
1715 info->thread = NULL;
1716
1717 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1718 if (psinfo == NULL) {
1719 info->psinfo.data = NULL;
1720 return 0;
1721 }
1722
1723 fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1724
1725
1726
1727
1728 info->thread_notes = 0;
1729 for (i = 0; i < view->n; ++i)
1730 if (view->regsets[i].core_note_type != 0)
1731 ++info->thread_notes;
1732
1733
1734
1735
1736
1737 if (unlikely(info->thread_notes == 0) ||
1738 unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) {
1739 WARN_ON(1);
1740 return 0;
1741 }
1742
1743
1744
1745
1746 fill_elf_header(elf, phdrs,
1747 view->e_machine, view->e_flags);
1748
1749
1750
1751
1752 for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) {
1753 t = kzalloc(offsetof(struct elf_thread_core_info,
1754 notes[info->thread_notes]),
1755 GFP_KERNEL);
1756 if (unlikely(!t))
1757 return 0;
1758
1759 t->task = ct->task;
1760 if (ct->task == dump_task || !info->thread) {
1761 t->next = info->thread;
1762 info->thread = t;
1763 } else {
1764
1765
1766
1767
1768 t->next = info->thread->next;
1769 info->thread->next = t;
1770 }
1771 }
1772
1773
1774
1775
1776 for (t = info->thread; t != NULL; t = t->next)
1777 if (!fill_thread_core_info(t, view, siginfo->si_signo, &info->size))
1778 return 0;
1779
1780
1781
1782
1783 fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm);
1784 info->size += notesize(&info->psinfo);
1785
1786 fill_siginfo_note(&info->signote, &info->csigdata, siginfo);
1787 info->size += notesize(&info->signote);
1788
1789 fill_auxv_note(&info->auxv, current->mm);
1790 info->size += notesize(&info->auxv);
1791
1792 if (fill_files_note(&info->files) == 0)
1793 info->size += notesize(&info->files);
1794
1795 return 1;
1796}
1797
1798static size_t get_note_info_size(struct elf_note_info *info)
1799{
1800 return info->size;
1801}
1802
1803
1804
1805
1806
1807static int write_note_info(struct elf_note_info *info,
1808 struct coredump_params *cprm)
1809{
1810 bool first = true;
1811 struct elf_thread_core_info *t = info->thread;
1812
1813 do {
1814 int i;
1815
1816 if (!writenote(&t->notes[0], cprm))
1817 return 0;
1818
1819 if (first && !writenote(&info->psinfo, cprm))
1820 return 0;
1821 if (first && !writenote(&info->signote, cprm))
1822 return 0;
1823 if (first && !writenote(&info->auxv, cprm))
1824 return 0;
1825 if (first && info->files.data &&
1826 !writenote(&info->files, cprm))
1827 return 0;
1828
1829 for (i = 1; i < info->thread_notes; ++i)
1830 if (t->notes[i].data &&
1831 !writenote(&t->notes[i], cprm))
1832 return 0;
1833
1834 first = false;
1835 t = t->next;
1836 } while (t);
1837
1838 return 1;
1839}
1840
1841static void free_note_info(struct elf_note_info *info)
1842{
1843 struct elf_thread_core_info *threads = info->thread;
1844 while (threads) {
1845 unsigned int i;
1846 struct elf_thread_core_info *t = threads;
1847 threads = t->next;
1848 WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus);
1849 for (i = 1; i < info->thread_notes; ++i)
1850 kfree(t->notes[i].data);
1851 kfree(t);
1852 }
1853 kfree(info->psinfo.data);
1854 vfree(info->files.data);
1855}
1856
1857#else
1858
1859
1860struct elf_thread_status
1861{
1862 struct list_head list;
1863 struct elf_prstatus prstatus;
1864 elf_fpregset_t fpu;
1865 struct task_struct *thread;
1866#ifdef ELF_CORE_COPY_XFPREGS
1867 elf_fpxregset_t xfpu;
1868#endif
1869 struct memelfnote notes[3];
1870 int num_notes;
1871};
1872
1873
1874
1875
1876
1877
1878static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1879{
1880 int sz = 0;
1881 struct task_struct *p = t->thread;
1882 t->num_notes = 0;
1883
1884 fill_prstatus(&t->prstatus, p, signr);
1885 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1886
1887 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1888 &(t->prstatus));
1889 t->num_notes++;
1890 sz += notesize(&t->notes[0]);
1891
1892 if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL,
1893 &t->fpu))) {
1894 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1895 &(t->fpu));
1896 t->num_notes++;
1897 sz += notesize(&t->notes[1]);
1898 }
1899
1900#ifdef ELF_CORE_COPY_XFPREGS
1901 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1902 fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
1903 sizeof(t->xfpu), &t->xfpu);
1904 t->num_notes++;
1905 sz += notesize(&t->notes[2]);
1906 }
1907#endif
1908 return sz;
1909}
1910
1911struct elf_note_info {
1912 struct memelfnote *notes;
1913 struct memelfnote *notes_files;
1914 struct elf_prstatus *prstatus;
1915 struct elf_prpsinfo *psinfo;
1916 struct list_head thread_list;
1917 elf_fpregset_t *fpu;
1918#ifdef ELF_CORE_COPY_XFPREGS
1919 elf_fpxregset_t *xfpu;
1920#endif
1921 user_siginfo_t csigdata;
1922 int thread_status_size;
1923 int numnote;
1924};
1925
1926static int elf_note_info_init(struct elf_note_info *info)
1927{
1928 memset(info, 0, sizeof(*info));
1929 INIT_LIST_HEAD(&info->thread_list);
1930
1931
1932 info->notes = kmalloc(8 * sizeof(struct memelfnote), GFP_KERNEL);
1933 if (!info->notes)
1934 return 0;
1935 info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
1936 if (!info->psinfo)
1937 return 0;
1938 info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL);
1939 if (!info->prstatus)
1940 return 0;
1941 info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
1942 if (!info->fpu)
1943 return 0;
1944#ifdef ELF_CORE_COPY_XFPREGS
1945 info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL);
1946 if (!info->xfpu)
1947 return 0;
1948#endif
1949 return 1;
1950}
1951
1952static int fill_note_info(struct elfhdr *elf, int phdrs,
1953 struct elf_note_info *info,
1954 const siginfo_t *siginfo, struct pt_regs *regs)
1955{
1956 struct list_head *t;
1957 struct core_thread *ct;
1958 struct elf_thread_status *ets;
1959
1960 if (!elf_note_info_init(info))
1961 return 0;
1962
1963 for (ct = current->mm->core_state->dumper.next;
1964 ct; ct = ct->next) {
1965 ets = kzalloc(sizeof(*ets), GFP_KERNEL);
1966 if (!ets)
1967 return 0;
1968
1969 ets->thread = ct->task;
1970 list_add(&ets->list, &info->thread_list);
1971 }
1972
1973 list_for_each(t, &info->thread_list) {
1974 int sz;
1975
1976 ets = list_entry(t, struct elf_thread_status, list);
1977 sz = elf_dump_thread_status(siginfo->si_signo, ets);
1978 info->thread_status_size += sz;
1979 }
1980
1981 memset(info->prstatus, 0, sizeof(*info->prstatus));
1982 fill_prstatus(info->prstatus, current, siginfo->si_signo);
1983 elf_core_copy_regs(&info->prstatus->pr_reg, regs);
1984
1985
1986 fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS);
1987
1988
1989
1990
1991
1992
1993 fill_note(info->notes + 0, "CORE", NT_PRSTATUS,
1994 sizeof(*info->prstatus), info->prstatus);
1995 fill_psinfo(info->psinfo, current->group_leader, current->mm);
1996 fill_note(info->notes + 1, "CORE", NT_PRPSINFO,
1997 sizeof(*info->psinfo), info->psinfo);
1998
1999 fill_siginfo_note(info->notes + 2, &info->csigdata, siginfo);
2000 fill_auxv_note(info->notes + 3, current->mm);
2001 info->numnote = 4;
2002
2003 if (fill_files_note(info->notes + info->numnote) == 0) {
2004 info->notes_files = info->notes + info->numnote;
2005 info->numnote++;
2006 }
2007
2008
2009 info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs,
2010 info->fpu);
2011 if (info->prstatus->pr_fpvalid)
2012 fill_note(info->notes + info->numnote++,
2013 "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu);
2014#ifdef ELF_CORE_COPY_XFPREGS
2015 if (elf_core_copy_task_xfpregs(current, info->xfpu))
2016 fill_note(info->notes + info->numnote++,
2017 "LINUX", ELF_CORE_XFPREG_TYPE,
2018 sizeof(*info->xfpu), info->xfpu);
2019#endif
2020
2021 return 1;
2022}
2023
2024static size_t get_note_info_size(struct elf_note_info *info)
2025{
2026 int sz = 0;
2027 int i;
2028
2029 for (i = 0; i < info->numnote; i++)
2030 sz += notesize(info->notes + i);
2031
2032 sz += info->thread_status_size;
2033
2034 return sz;
2035}
2036
2037static int write_note_info(struct elf_note_info *info,
2038 struct coredump_params *cprm)
2039{
2040 int i;
2041 struct list_head *t;
2042
2043 for (i = 0; i < info->numnote; i++)
2044 if (!writenote(info->notes + i, cprm))
2045 return 0;
2046
2047
2048 list_for_each(t, &info->thread_list) {
2049 struct elf_thread_status *tmp =
2050 list_entry(t, struct elf_thread_status, list);
2051
2052 for (i = 0; i < tmp->num_notes; i++)
2053 if (!writenote(&tmp->notes[i], cprm))
2054 return 0;
2055 }
2056
2057 return 1;
2058}
2059
2060static void free_note_info(struct elf_note_info *info)
2061{
2062 while (!list_empty(&info->thread_list)) {
2063 struct list_head *tmp = info->thread_list.next;
2064 list_del(tmp);
2065 kfree(list_entry(tmp, struct elf_thread_status, list));
2066 }
2067
2068
2069 if (info->notes_files)
2070 vfree(info->notes_files->data);
2071
2072 kfree(info->prstatus);
2073 kfree(info->psinfo);
2074 kfree(info->notes);
2075 kfree(info->fpu);
2076#ifdef ELF_CORE_COPY_XFPREGS
2077 kfree(info->xfpu);
2078#endif
2079}
2080
2081#endif
2082
2083static struct vm_area_struct *first_vma(struct task_struct *tsk,
2084 struct vm_area_struct *gate_vma)
2085{
2086 struct vm_area_struct *ret = tsk->mm->mmap;
2087
2088 if (ret)
2089 return ret;
2090 return gate_vma;
2091}
2092
2093
2094
2095
2096static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
2097 struct vm_area_struct *gate_vma)
2098{
2099 struct vm_area_struct *ret;
2100
2101 ret = this_vma->vm_next;
2102 if (ret)
2103 return ret;
2104 if (this_vma == gate_vma)
2105 return NULL;
2106 return gate_vma;
2107}
2108
2109static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
2110 elf_addr_t e_shoff, int segs)
2111{
2112 elf->e_shoff = e_shoff;
2113 elf->e_shentsize = sizeof(*shdr4extnum);
2114 elf->e_shnum = 1;
2115 elf->e_shstrndx = SHN_UNDEF;
2116
2117 memset(shdr4extnum, 0, sizeof(*shdr4extnum));
2118
2119 shdr4extnum->sh_type = SHT_NULL;
2120 shdr4extnum->sh_size = elf->e_shnum;
2121 shdr4extnum->sh_link = elf->e_shstrndx;
2122 shdr4extnum->sh_info = segs;
2123}
2124
2125
2126
2127
2128
2129
2130
2131
2132static int elf_core_dump(struct coredump_params *cprm)
2133{
2134 int has_dumped = 0;
2135 mm_segment_t fs;
2136 int segs, i;
2137 size_t vma_data_size = 0;
2138 struct vm_area_struct *vma, *gate_vma;
2139 struct elfhdr *elf = NULL;
2140 loff_t offset = 0, dataoff;
2141 struct elf_note_info info = { };
2142 struct elf_phdr *phdr4note = NULL;
2143 struct elf_shdr *shdr4extnum = NULL;
2144 Elf_Half e_phnum;
2145 elf_addr_t e_shoff;
2146 elf_addr_t *vma_filesz = NULL;
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
2162 if (!elf)
2163 goto out;
2164
2165
2166
2167
2168 segs = current->mm->map_count;
2169 segs += elf_core_extra_phdrs();
2170
2171 gate_vma = get_gate_vma(current->mm);
2172 if (gate_vma != NULL)
2173 segs++;
2174
2175
2176 segs++;
2177
2178
2179
2180
2181 e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
2182
2183
2184
2185
2186
2187 if (!fill_note_info(elf, e_phnum, &info, cprm->siginfo, cprm->regs))
2188 goto cleanup;
2189
2190 has_dumped = 1;
2191
2192 fs = get_fs();
2193 set_fs(KERNEL_DS);
2194
2195 offset += sizeof(*elf);
2196 offset += segs * sizeof(struct elf_phdr);
2197
2198
2199 {
2200 size_t sz = get_note_info_size(&info);
2201
2202 sz += elf_coredump_extra_notes_size();
2203
2204 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
2205 if (!phdr4note)
2206 goto end_coredump;
2207
2208 fill_elf_note_phdr(phdr4note, sz, offset);
2209 offset += sz;
2210 }
2211
2212 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
2213
2214 vma_filesz = kmalloc_array(segs - 1, sizeof(*vma_filesz), GFP_KERNEL);
2215 if (!vma_filesz)
2216 goto end_coredump;
2217
2218 for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
2219 vma = next_vma(vma, gate_vma)) {
2220 unsigned long dump_size;
2221
2222 dump_size = vma_dump_size(vma, cprm->mm_flags);
2223 vma_filesz[i++] = dump_size;
2224 vma_data_size += dump_size;
2225 }
2226
2227 offset += vma_data_size;
2228 offset += elf_core_extra_data_size();
2229 e_shoff = offset;
2230
2231 if (e_phnum == PN_XNUM) {
2232 shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
2233 if (!shdr4extnum)
2234 goto end_coredump;
2235 fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
2236 }
2237
2238 offset = dataoff;
2239
2240 if (!dump_emit(cprm, elf, sizeof(*elf)))
2241 goto end_coredump;
2242
2243 if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note)))
2244 goto end_coredump;
2245
2246
2247 for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
2248 vma = next_vma(vma, gate_vma)) {
2249 struct elf_phdr phdr;
2250
2251 phdr.p_type = PT_LOAD;
2252 phdr.p_offset = offset;
2253 phdr.p_vaddr = vma->vm_start;
2254 phdr.p_paddr = 0;
2255 phdr.p_filesz = vma_filesz[i++];
2256 phdr.p_memsz = vma->vm_end - vma->vm_start;
2257 offset += phdr.p_filesz;
2258 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
2259 if (vma->vm_flags & VM_WRITE)
2260 phdr.p_flags |= PF_W;
2261 if (vma->vm_flags & VM_EXEC)
2262 phdr.p_flags |= PF_X;
2263 phdr.p_align = ELF_EXEC_PAGESIZE;
2264
2265 if (!dump_emit(cprm, &phdr, sizeof(phdr)))
2266 goto end_coredump;
2267 }
2268
2269 if (!elf_core_write_extra_phdrs(cprm, offset))
2270 goto end_coredump;
2271
2272
2273 if (!write_note_info(&info, cprm))
2274 goto end_coredump;
2275
2276 if (elf_coredump_extra_notes_write(cprm))
2277 goto end_coredump;
2278
2279
2280 if (!dump_skip(cprm, dataoff - cprm->pos))
2281 goto end_coredump;
2282
2283 for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
2284 vma = next_vma(vma, gate_vma)) {
2285 unsigned long addr;
2286 unsigned long end;
2287
2288 end = vma->vm_start + vma_filesz[i++];
2289
2290 for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) {
2291 struct page *page;
2292 int stop;
2293
2294 page = get_dump_page(addr);
2295 if (page) {
2296 void *kaddr = kmap(page);
2297 stop = !dump_emit(cprm, kaddr, PAGE_SIZE);
2298 kunmap(page);
2299 put_page(page);
2300 } else
2301 stop = !dump_skip(cprm, PAGE_SIZE);
2302 if (stop)
2303 goto end_coredump;
2304 }
2305 }
2306
2307 if (!elf_core_write_extra_data(cprm))
2308 goto end_coredump;
2309
2310 if (e_phnum == PN_XNUM) {
2311 if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum)))
2312 goto end_coredump;
2313 }
2314
2315end_coredump:
2316 set_fs(fs);
2317
2318cleanup:
2319 free_note_info(&info);
2320 kfree(shdr4extnum);
2321 kfree(vma_filesz);
2322 kfree(phdr4note);
2323 kfree(elf);
2324out:
2325 return has_dumped;
2326}
2327
2328#endif
2329
2330static int __init init_elf_binfmt(void)
2331{
2332 register_binfmt(&elf_format);
2333 return 0;
2334}
2335
2336static void __exit exit_elf_binfmt(void)
2337{
2338
2339 unregister_binfmt(&elf_format);
2340}
2341
2342core_initcall(init_elf_binfmt);
2343module_exit(exit_elf_binfmt);
2344MODULE_LICENSE("GPL");
2345