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7
8
9#include <linux/module.h>
10
11#include <linux/fs.h>
12#include <linux/stat.h>
13#include <linux/sched.h>
14#include <linux/sched/coredump.h>
15#include <linux/sched/task_stack.h>
16#include <linux/sched/cputime.h>
17#include <linux/mm.h>
18#include <linux/mman.h>
19#include <linux/errno.h>
20#include <linux/signal.h>
21#include <linux/binfmts.h>
22#include <linux/string.h>
23#include <linux/file.h>
24#include <linux/fcntl.h>
25#include <linux/slab.h>
26#include <linux/pagemap.h>
27#include <linux/security.h>
28#include <linux/highmem.h>
29#include <linux/highuid.h>
30#include <linux/personality.h>
31#include <linux/ptrace.h>
32#include <linux/init.h>
33#include <linux/elf.h>
34#include <linux/elf-fdpic.h>
35#include <linux/elfcore.h>
36#include <linux/coredump.h>
37#include <linux/dax.h>
38#include <linux/regset.h>
39
40#include <linux/uaccess.h>
41#include <asm/param.h>
42
43typedef char *elf_caddr_t;
44
45#if 0
46#define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
47#else
48#define kdebug(fmt, ...) do {} while(0)
49#endif
50
51#if 0
52#define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
53#else
54#define kdcore(fmt, ...) do {} while(0)
55#endif
56
57MODULE_LICENSE("GPL");
58
59static int load_elf_fdpic_binary(struct linux_binprm *);
60static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *);
61static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *,
62 struct mm_struct *, const char *);
63
64static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *,
65 struct elf_fdpic_params *,
66 struct elf_fdpic_params *);
67
68#ifndef CONFIG_MMU
69static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *,
70 struct file *,
71 struct mm_struct *);
72#endif
73
74static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
75 struct file *, struct mm_struct *);
76
77#ifdef CONFIG_ELF_CORE
78static int elf_fdpic_core_dump(struct coredump_params *cprm);
79#endif
80
81static struct linux_binfmt elf_fdpic_format = {
82 .module = THIS_MODULE,
83 .load_binary = load_elf_fdpic_binary,
84#ifdef CONFIG_ELF_CORE
85 .core_dump = elf_fdpic_core_dump,
86#endif
87 .min_coredump = ELF_EXEC_PAGESIZE,
88};
89
90static int __init init_elf_fdpic_binfmt(void)
91{
92 register_binfmt(&elf_fdpic_format);
93 return 0;
94}
95
96static void __exit exit_elf_fdpic_binfmt(void)
97{
98 unregister_binfmt(&elf_fdpic_format);
99}
100
101core_initcall(init_elf_fdpic_binfmt);
102module_exit(exit_elf_fdpic_binfmt);
103
104static int is_elf(struct elfhdr *hdr, struct file *file)
105{
106 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0)
107 return 0;
108 if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)
109 return 0;
110 if (!elf_check_arch(hdr))
111 return 0;
112 if (!file->f_op->mmap)
113 return 0;
114 return 1;
115}
116
117#ifndef elf_check_fdpic
118#define elf_check_fdpic(x) 0
119#endif
120
121#ifndef elf_check_const_displacement
122#define elf_check_const_displacement(x) 0
123#endif
124
125static int is_constdisp(struct elfhdr *hdr)
126{
127 if (!elf_check_fdpic(hdr))
128 return 1;
129 if (elf_check_const_displacement(hdr))
130 return 1;
131 return 0;
132}
133
134
135
136
137
138static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,
139 struct file *file)
140{
141 struct elf32_phdr *phdr;
142 unsigned long size;
143 int retval, loop;
144 loff_t pos = params->hdr.e_phoff;
145
146 if (params->hdr.e_phentsize != sizeof(struct elf_phdr))
147 return -ENOMEM;
148 if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr))
149 return -ENOMEM;
150
151 size = params->hdr.e_phnum * sizeof(struct elf_phdr);
152 params->phdrs = kmalloc(size, GFP_KERNEL);
153 if (!params->phdrs)
154 return -ENOMEM;
155
156 retval = kernel_read(file, params->phdrs, size, &pos);
157 if (unlikely(retval != size))
158 return retval < 0 ? retval : -ENOEXEC;
159
160
161 phdr = params->phdrs;
162 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
163 if (phdr->p_type != PT_GNU_STACK)
164 continue;
165
166 if (phdr->p_flags & PF_X)
167 params->flags |= ELF_FDPIC_FLAG_EXEC_STACK;
168 else
169 params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK;
170
171 params->stack_size = phdr->p_memsz;
172 break;
173 }
174
175 return 0;
176}
177
178
179
180
181
182static int load_elf_fdpic_binary(struct linux_binprm *bprm)
183{
184 struct elf_fdpic_params exec_params, interp_params;
185 struct pt_regs *regs = current_pt_regs();
186 struct elf_phdr *phdr;
187 unsigned long stack_size, entryaddr;
188#ifdef ELF_FDPIC_PLAT_INIT
189 unsigned long dynaddr;
190#endif
191#ifndef CONFIG_MMU
192 unsigned long stack_prot;
193#endif
194 struct file *interpreter = NULL;
195 char *interpreter_name = NULL;
196 int executable_stack;
197 int retval, i;
198 loff_t pos;
199
200 kdebug("____ LOAD %d ____", current->pid);
201
202 memset(&exec_params, 0, sizeof(exec_params));
203 memset(&interp_params, 0, sizeof(interp_params));
204
205 exec_params.hdr = *(struct elfhdr *) bprm->buf;
206 exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE;
207
208
209 retval = -ENOEXEC;
210 if (!is_elf(&exec_params.hdr, bprm->file))
211 goto error;
212 if (!elf_check_fdpic(&exec_params.hdr)) {
213#ifdef CONFIG_MMU
214
215 goto error;
216#else
217
218 if (exec_params.hdr.e_type != ET_DYN)
219 goto error;
220#endif
221 }
222
223
224 retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file);
225 if (retval < 0)
226 goto error;
227
228
229 phdr = exec_params.phdrs;
230
231 for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) {
232 switch (phdr->p_type) {
233 case PT_INTERP:
234 retval = -ENOMEM;
235 if (phdr->p_filesz > PATH_MAX)
236 goto error;
237 retval = -ENOENT;
238 if (phdr->p_filesz < 2)
239 goto error;
240
241
242 interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL);
243 if (!interpreter_name)
244 goto error;
245
246 pos = phdr->p_offset;
247 retval = kernel_read(bprm->file, interpreter_name,
248 phdr->p_filesz, &pos);
249 if (unlikely(retval != phdr->p_filesz)) {
250 if (retval >= 0)
251 retval = -ENOEXEC;
252 goto error;
253 }
254
255 retval = -ENOENT;
256 if (interpreter_name[phdr->p_filesz - 1] != '\0')
257 goto error;
258
259 kdebug("Using ELF interpreter %s", interpreter_name);
260
261
262 interpreter = open_exec(interpreter_name);
263 retval = PTR_ERR(interpreter);
264 if (IS_ERR(interpreter)) {
265 interpreter = NULL;
266 goto error;
267 }
268
269
270
271
272
273
274 would_dump(bprm, interpreter);
275
276 pos = 0;
277 retval = kernel_read(interpreter, bprm->buf,
278 BINPRM_BUF_SIZE, &pos);
279 if (unlikely(retval != BINPRM_BUF_SIZE)) {
280 if (retval >= 0)
281 retval = -ENOEXEC;
282 goto error;
283 }
284
285 interp_params.hdr = *((struct elfhdr *) bprm->buf);
286 break;
287
288 case PT_LOAD:
289#ifdef CONFIG_MMU
290 if (exec_params.load_addr == 0)
291 exec_params.load_addr = phdr->p_vaddr;
292#endif
293 break;
294 }
295
296 }
297
298 if (is_constdisp(&exec_params.hdr))
299 exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
300
301
302 if (interpreter_name) {
303 retval = -ELIBBAD;
304 if (!is_elf(&interp_params.hdr, interpreter))
305 goto error;
306
307 interp_params.flags = ELF_FDPIC_FLAG_PRESENT;
308
309
310 retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter);
311 if (retval < 0)
312 goto error;
313 }
314
315 stack_size = exec_params.stack_size;
316 if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
317 executable_stack = EXSTACK_ENABLE_X;
318 else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
319 executable_stack = EXSTACK_DISABLE_X;
320 else
321 executable_stack = EXSTACK_DEFAULT;
322
323 if (stack_size == 0) {
324 stack_size = interp_params.stack_size;
325 if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
326 executable_stack = EXSTACK_ENABLE_X;
327 else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
328 executable_stack = EXSTACK_DISABLE_X;
329 else
330 executable_stack = EXSTACK_DEFAULT;
331 }
332
333 retval = -ENOEXEC;
334 if (stack_size == 0)
335 stack_size = 131072UL;
336
337 if (is_constdisp(&interp_params.hdr))
338 interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
339
340
341 retval = begin_new_exec(bprm);
342 if (retval)
343 goto error;
344
345
346
347
348 if (elf_check_fdpic(&exec_params.hdr))
349 set_personality(PER_LINUX_FDPIC);
350 else
351 set_personality(PER_LINUX);
352 if (elf_read_implies_exec(&exec_params.hdr, executable_stack))
353 current->personality |= READ_IMPLIES_EXEC;
354
355 setup_new_exec(bprm);
356
357 set_binfmt(&elf_fdpic_format);
358
359 current->mm->start_code = 0;
360 current->mm->end_code = 0;
361 current->mm->start_stack = 0;
362 current->mm->start_data = 0;
363 current->mm->end_data = 0;
364 current->mm->context.exec_fdpic_loadmap = 0;
365 current->mm->context.interp_fdpic_loadmap = 0;
366
367#ifdef CONFIG_MMU
368 elf_fdpic_arch_lay_out_mm(&exec_params,
369 &interp_params,
370 ¤t->mm->start_stack,
371 ¤t->mm->start_brk);
372
373 retval = setup_arg_pages(bprm, current->mm->start_stack,
374 executable_stack);
375 if (retval < 0)
376 goto error;
377#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
378 retval = arch_setup_additional_pages(bprm, !!interpreter_name);
379 if (retval < 0)
380 goto error;
381#endif
382#endif
383
384
385 retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm,
386 "executable");
387 if (retval < 0)
388 goto error;
389
390 if (interpreter_name) {
391 retval = elf_fdpic_map_file(&interp_params, interpreter,
392 current->mm, "interpreter");
393 if (retval < 0) {
394 printk(KERN_ERR "Unable to load interpreter\n");
395 goto error;
396 }
397
398 allow_write_access(interpreter);
399 fput(interpreter);
400 interpreter = NULL;
401 }
402
403#ifdef CONFIG_MMU
404 if (!current->mm->start_brk)
405 current->mm->start_brk = current->mm->end_data;
406
407 current->mm->brk = current->mm->start_brk =
408 PAGE_ALIGN(current->mm->start_brk);
409
410#else
411
412 stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK;
413 if (stack_size < PAGE_SIZE * 2)
414 stack_size = PAGE_SIZE * 2;
415
416 stack_prot = PROT_READ | PROT_WRITE;
417 if (executable_stack == EXSTACK_ENABLE_X ||
418 (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC))
419 stack_prot |= PROT_EXEC;
420
421 current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot,
422 MAP_PRIVATE | MAP_ANONYMOUS |
423 MAP_UNINITIALIZED | MAP_GROWSDOWN,
424 0);
425
426 if (IS_ERR_VALUE(current->mm->start_brk)) {
427 retval = current->mm->start_brk;
428 current->mm->start_brk = 0;
429 goto error;
430 }
431
432 current->mm->brk = current->mm->start_brk;
433 current->mm->context.end_brk = current->mm->start_brk;
434 current->mm->start_stack = current->mm->start_brk + stack_size;
435#endif
436
437 if (create_elf_fdpic_tables(bprm, current->mm,
438 &exec_params, &interp_params) < 0)
439 goto error;
440
441 kdebug("- start_code %lx", current->mm->start_code);
442 kdebug("- end_code %lx", current->mm->end_code);
443 kdebug("- start_data %lx", current->mm->start_data);
444 kdebug("- end_data %lx", current->mm->end_data);
445 kdebug("- start_brk %lx", current->mm->start_brk);
446 kdebug("- brk %lx", current->mm->brk);
447 kdebug("- start_stack %lx", current->mm->start_stack);
448
449#ifdef ELF_FDPIC_PLAT_INIT
450
451
452
453
454
455
456 dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr;
457 ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr,
458 dynaddr);
459#endif
460
461 finalize_exec(bprm);
462
463 entryaddr = interp_params.entry_addr ?: exec_params.entry_addr;
464 start_thread(regs, entryaddr, current->mm->start_stack);
465
466 retval = 0;
467
468error:
469 if (interpreter) {
470 allow_write_access(interpreter);
471 fput(interpreter);
472 }
473 kfree(interpreter_name);
474 kfree(exec_params.phdrs);
475 kfree(exec_params.loadmap);
476 kfree(interp_params.phdrs);
477 kfree(interp_params.loadmap);
478 return retval;
479}
480
481
482
483#ifndef ELF_BASE_PLATFORM
484
485
486
487
488
489#define ELF_BASE_PLATFORM NULL
490#endif
491
492
493
494
495
496static int create_elf_fdpic_tables(struct linux_binprm *bprm,
497 struct mm_struct *mm,
498 struct elf_fdpic_params *exec_params,
499 struct elf_fdpic_params *interp_params)
500{
501 const struct cred *cred = current_cred();
502 unsigned long sp, csp, nitems;
503 elf_caddr_t __user *argv, *envp;
504 size_t platform_len = 0, len;
505 char *k_platform, *k_base_platform;
506 char __user *u_platform, *u_base_platform, *p;
507 int loop;
508 int nr;
509 unsigned long flags = 0;
510
511#ifdef CONFIG_MMU
512
513
514
515
516
517 sp = arch_align_stack(bprm->p);
518#else
519 sp = mm->start_stack;
520
521
522 if (transfer_args_to_stack(bprm, &sp) < 0)
523 return -EFAULT;
524 sp &= ~15;
525#endif
526
527
528
529
530
531
532
533 k_platform = ELF_PLATFORM;
534 u_platform = NULL;
535
536 if (k_platform) {
537 platform_len = strlen(k_platform) + 1;
538 sp -= platform_len;
539 u_platform = (char __user *) sp;
540 if (copy_to_user(u_platform, k_platform, platform_len) != 0)
541 return -EFAULT;
542 }
543
544
545
546
547
548 k_base_platform = ELF_BASE_PLATFORM;
549 u_base_platform = NULL;
550
551 if (k_base_platform) {
552 platform_len = strlen(k_base_platform) + 1;
553 sp -= platform_len;
554 u_base_platform = (char __user *) sp;
555 if (copy_to_user(u_base_platform, k_base_platform, platform_len) != 0)
556 return -EFAULT;
557 }
558
559 sp &= ~7UL;
560
561
562 len = sizeof(struct elf32_fdpic_loadmap);
563 len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs;
564 sp = (sp - len) & ~7UL;
565 exec_params->map_addr = sp;
566
567 if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0)
568 return -EFAULT;
569
570 current->mm->context.exec_fdpic_loadmap = (unsigned long) sp;
571
572 if (interp_params->loadmap) {
573 len = sizeof(struct elf32_fdpic_loadmap);
574 len += sizeof(struct elf32_fdpic_loadseg) *
575 interp_params->loadmap->nsegs;
576 sp = (sp - len) & ~7UL;
577 interp_params->map_addr = sp;
578
579 if (copy_to_user((void __user *) sp, interp_params->loadmap,
580 len) != 0)
581 return -EFAULT;
582
583 current->mm->context.interp_fdpic_loadmap = (unsigned long) sp;
584 }
585
586
587#define DLINFO_ITEMS 15
588
589 nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) +
590 (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH;
591
592 if (bprm->have_execfd)
593 nitems++;
594
595 csp = sp;
596 sp -= nitems * 2 * sizeof(unsigned long);
597 sp -= (bprm->envc + 1) * sizeof(char *);
598 sp -= (bprm->argc + 1) * sizeof(char *);
599 sp -= 1 * sizeof(unsigned long);
600
601 csp -= sp & 15UL;
602 sp -= sp & 15UL;
603
604
605#define NEW_AUX_ENT(id, val) \
606 do { \
607 struct { unsigned long _id, _val; } __user *ent, v; \
608 \
609 ent = (void __user *) csp; \
610 v._id = (id); \
611 v._val = (val); \
612 if (copy_to_user(ent + nr, &v, sizeof(v))) \
613 return -EFAULT; \
614 nr++; \
615 } while (0)
616
617 nr = 0;
618 csp -= 2 * sizeof(unsigned long);
619 NEW_AUX_ENT(AT_NULL, 0);
620 if (k_platform) {
621 nr = 0;
622 csp -= 2 * sizeof(unsigned long);
623 NEW_AUX_ENT(AT_PLATFORM,
624 (elf_addr_t) (unsigned long) u_platform);
625 }
626
627 if (k_base_platform) {
628 nr = 0;
629 csp -= 2 * sizeof(unsigned long);
630 NEW_AUX_ENT(AT_BASE_PLATFORM,
631 (elf_addr_t) (unsigned long) u_base_platform);
632 }
633
634 if (bprm->have_execfd) {
635 nr = 0;
636 csp -= 2 * sizeof(unsigned long);
637 NEW_AUX_ENT(AT_EXECFD, bprm->execfd);
638 }
639
640 nr = 0;
641 csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long);
642 NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
643#ifdef ELF_HWCAP2
644 NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);
645#endif
646 NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE);
647 NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
648 NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr);
649 NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
650 NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum);
651 NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr);
652 if (bprm->interp_flags & BINPRM_FLAGS_PRESERVE_ARGV0)
653 flags |= AT_FLAGS_PRESERVE_ARGV0;
654 NEW_AUX_ENT(AT_FLAGS, flags);
655 NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr);
656 NEW_AUX_ENT(AT_UID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid));
657 NEW_AUX_ENT(AT_EUID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid));
658 NEW_AUX_ENT(AT_GID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid));
659 NEW_AUX_ENT(AT_EGID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid));
660 NEW_AUX_ENT(AT_SECURE, bprm->secureexec);
661 NEW_AUX_ENT(AT_EXECFN, bprm->exec);
662
663#ifdef ARCH_DLINFO
664 nr = 0;
665 csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long);
666
667
668
669
670 ARCH_DLINFO;
671#endif
672#undef NEW_AUX_ENT
673
674
675 csp -= (bprm->envc + 1) * sizeof(elf_caddr_t);
676 envp = (elf_caddr_t __user *) csp;
677 csp -= (bprm->argc + 1) * sizeof(elf_caddr_t);
678 argv = (elf_caddr_t __user *) csp;
679
680
681 csp -= sizeof(unsigned long);
682 if (put_user(bprm->argc, (unsigned long __user *) csp))
683 return -EFAULT;
684
685 BUG_ON(csp != sp);
686
687
688#ifdef CONFIG_MMU
689 current->mm->arg_start = bprm->p;
690#else
691 current->mm->arg_start = current->mm->start_stack -
692 (MAX_ARG_PAGES * PAGE_SIZE - bprm->p);
693#endif
694
695 p = (char __user *) current->mm->arg_start;
696 for (loop = bprm->argc; loop > 0; loop--) {
697 if (put_user((elf_caddr_t) p, argv++))
698 return -EFAULT;
699 len = strnlen_user(p, MAX_ARG_STRLEN);
700 if (!len || len > MAX_ARG_STRLEN)
701 return -EINVAL;
702 p += len;
703 }
704 if (put_user(NULL, argv))
705 return -EFAULT;
706 current->mm->arg_end = (unsigned long) p;
707
708
709 current->mm->env_start = (unsigned long) p;
710 for (loop = bprm->envc; loop > 0; loop--) {
711 if (put_user((elf_caddr_t)(unsigned long) p, envp++))
712 return -EFAULT;
713 len = strnlen_user(p, MAX_ARG_STRLEN);
714 if (!len || len > MAX_ARG_STRLEN)
715 return -EINVAL;
716 p += len;
717 }
718 if (put_user(NULL, envp))
719 return -EFAULT;
720 current->mm->env_end = (unsigned long) p;
721
722 mm->start_stack = (unsigned long) sp;
723 return 0;
724}
725
726
727
728
729
730
731
732
733
734
735
736
737static int elf_fdpic_map_file(struct elf_fdpic_params *params,
738 struct file *file,
739 struct mm_struct *mm,
740 const char *what)
741{
742 struct elf32_fdpic_loadmap *loadmap;
743#ifdef CONFIG_MMU
744 struct elf32_fdpic_loadseg *mseg;
745#endif
746 struct elf32_fdpic_loadseg *seg;
747 struct elf32_phdr *phdr;
748 unsigned long load_addr, stop;
749 unsigned nloads, tmp;
750 size_t size;
751 int loop, ret;
752
753
754 nloads = 0;
755 for (loop = 0; loop < params->hdr.e_phnum; loop++)
756 if (params->phdrs[loop].p_type == PT_LOAD)
757 nloads++;
758
759 if (nloads == 0)
760 return -ELIBBAD;
761
762 size = sizeof(*loadmap) + nloads * sizeof(*seg);
763 loadmap = kzalloc(size, GFP_KERNEL);
764 if (!loadmap)
765 return -ENOMEM;
766
767 params->loadmap = loadmap;
768
769 loadmap->version = ELF32_FDPIC_LOADMAP_VERSION;
770 loadmap->nsegs = nloads;
771
772 load_addr = params->load_addr;
773 seg = loadmap->segs;
774
775
776 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
777 case ELF_FDPIC_FLAG_CONSTDISP:
778 case ELF_FDPIC_FLAG_CONTIGUOUS:
779#ifndef CONFIG_MMU
780 ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm);
781 if (ret < 0)
782 return ret;
783 break;
784#endif
785 default:
786 ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm);
787 if (ret < 0)
788 return ret;
789 break;
790 }
791
792
793 if (params->hdr.e_entry) {
794 seg = loadmap->segs;
795 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
796 if (params->hdr.e_entry >= seg->p_vaddr &&
797 params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) {
798 params->entry_addr =
799 (params->hdr.e_entry - seg->p_vaddr) +
800 seg->addr;
801 break;
802 }
803 }
804 }
805
806
807 stop = params->hdr.e_phoff;
808 stop += params->hdr.e_phnum * sizeof (struct elf_phdr);
809 phdr = params->phdrs;
810
811 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
812 if (phdr->p_type != PT_LOAD)
813 continue;
814
815 if (phdr->p_offset > params->hdr.e_phoff ||
816 phdr->p_offset + phdr->p_filesz < stop)
817 continue;
818
819 seg = loadmap->segs;
820 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
821 if (phdr->p_vaddr >= seg->p_vaddr &&
822 phdr->p_vaddr + phdr->p_filesz <=
823 seg->p_vaddr + seg->p_memsz) {
824 params->ph_addr =
825 (phdr->p_vaddr - seg->p_vaddr) +
826 seg->addr +
827 params->hdr.e_phoff - phdr->p_offset;
828 break;
829 }
830 }
831 break;
832 }
833
834
835 phdr = params->phdrs;
836 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
837 if (phdr->p_type != PT_DYNAMIC)
838 continue;
839
840 seg = loadmap->segs;
841 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
842 if (phdr->p_vaddr >= seg->p_vaddr &&
843 phdr->p_vaddr + phdr->p_memsz <=
844 seg->p_vaddr + seg->p_memsz) {
845 Elf32_Dyn __user *dyn;
846 Elf32_Sword d_tag;
847
848 params->dynamic_addr =
849 (phdr->p_vaddr - seg->p_vaddr) +
850 seg->addr;
851
852
853
854
855 if (phdr->p_memsz == 0 ||
856 phdr->p_memsz % sizeof(Elf32_Dyn) != 0)
857 goto dynamic_error;
858
859 tmp = phdr->p_memsz / sizeof(Elf32_Dyn);
860 dyn = (Elf32_Dyn __user *)params->dynamic_addr;
861 if (get_user(d_tag, &dyn[tmp - 1].d_tag) ||
862 d_tag != 0)
863 goto dynamic_error;
864 break;
865 }
866 }
867 break;
868 }
869
870
871
872
873
874#ifdef CONFIG_MMU
875 nloads = loadmap->nsegs;
876 mseg = loadmap->segs;
877 seg = mseg + 1;
878 for (loop = 1; loop < nloads; loop++) {
879
880 if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) {
881 load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz);
882 if (load_addr == (seg->addr & PAGE_MASK)) {
883 mseg->p_memsz +=
884 load_addr -
885 (mseg->addr + mseg->p_memsz);
886 mseg->p_memsz += seg->addr & ~PAGE_MASK;
887 mseg->p_memsz += seg->p_memsz;
888 loadmap->nsegs--;
889 continue;
890 }
891 }
892
893 mseg++;
894 if (mseg != seg)
895 *mseg = *seg;
896 }
897#endif
898
899 kdebug("Mapped Object [%s]:", what);
900 kdebug("- elfhdr : %lx", params->elfhdr_addr);
901 kdebug("- entry : %lx", params->entry_addr);
902 kdebug("- PHDR[] : %lx", params->ph_addr);
903 kdebug("- DYNAMIC[]: %lx", params->dynamic_addr);
904 seg = loadmap->segs;
905 for (loop = 0; loop < loadmap->nsegs; loop++, seg++)
906 kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]",
907 loop,
908 seg->addr, seg->addr + seg->p_memsz - 1,
909 seg->p_vaddr, seg->p_memsz);
910
911 return 0;
912
913dynamic_error:
914 printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n",
915 what, file_inode(file)->i_ino);
916 return -ELIBBAD;
917}
918
919
920
921
922
923#ifndef CONFIG_MMU
924static int elf_fdpic_map_file_constdisp_on_uclinux(
925 struct elf_fdpic_params *params,
926 struct file *file,
927 struct mm_struct *mm)
928{
929 struct elf32_fdpic_loadseg *seg;
930 struct elf32_phdr *phdr;
931 unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags;
932 int loop, ret;
933
934 load_addr = params->load_addr;
935 seg = params->loadmap->segs;
936
937
938
939 phdr = params->phdrs;
940 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
941 if (params->phdrs[loop].p_type != PT_LOAD)
942 continue;
943
944 if (base > phdr->p_vaddr)
945 base = phdr->p_vaddr;
946 if (top < phdr->p_vaddr + phdr->p_memsz)
947 top = phdr->p_vaddr + phdr->p_memsz;
948 }
949
950
951 mflags = MAP_PRIVATE;
952 if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
953 mflags |= MAP_EXECUTABLE;
954
955 maddr = vm_mmap(NULL, load_addr, top - base,
956 PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0);
957 if (IS_ERR_VALUE(maddr))
958 return (int) maddr;
959
960 if (load_addr != 0)
961 load_addr += PAGE_ALIGN(top - base);
962
963
964 phdr = params->phdrs;
965 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
966 if (params->phdrs[loop].p_type != PT_LOAD)
967 continue;
968
969 seg->addr = maddr + (phdr->p_vaddr - base);
970 seg->p_vaddr = phdr->p_vaddr;
971 seg->p_memsz = phdr->p_memsz;
972
973 ret = read_code(file, seg->addr, phdr->p_offset,
974 phdr->p_filesz);
975 if (ret < 0)
976 return ret;
977
978
979 if (phdr->p_offset == 0)
980 params->elfhdr_addr = seg->addr;
981
982
983 if (phdr->p_filesz < phdr->p_memsz) {
984 if (clear_user((void *) (seg->addr + phdr->p_filesz),
985 phdr->p_memsz - phdr->p_filesz))
986 return -EFAULT;
987 }
988
989 if (mm) {
990 if (phdr->p_flags & PF_X) {
991 if (!mm->start_code) {
992 mm->start_code = seg->addr;
993 mm->end_code = seg->addr +
994 phdr->p_memsz;
995 }
996 } else if (!mm->start_data) {
997 mm->start_data = seg->addr;
998 mm->end_data = seg->addr + phdr->p_memsz;
999 }
1000 }
1001
1002 seg++;
1003 }
1004
1005 return 0;
1006}
1007#endif
1008
1009
1010
1011
1012
1013static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
1014 struct file *file,
1015 struct mm_struct *mm)
1016{
1017 struct elf32_fdpic_loadseg *seg;
1018 struct elf32_phdr *phdr;
1019 unsigned long load_addr, delta_vaddr;
1020 int loop, dvset;
1021
1022 load_addr = params->load_addr;
1023 delta_vaddr = 0;
1024 dvset = 0;
1025
1026 seg = params->loadmap->segs;
1027
1028
1029 phdr = params->phdrs;
1030 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
1031 unsigned long maddr, disp, excess, excess1;
1032 int prot = 0, flags;
1033
1034 if (phdr->p_type != PT_LOAD)
1035 continue;
1036
1037 kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx",
1038 (unsigned long) phdr->p_vaddr,
1039 (unsigned long) phdr->p_offset,
1040 (unsigned long) phdr->p_filesz,
1041 (unsigned long) phdr->p_memsz);
1042
1043
1044 if (phdr->p_flags & PF_R) prot |= PROT_READ;
1045 if (phdr->p_flags & PF_W) prot |= PROT_WRITE;
1046 if (phdr->p_flags & PF_X) prot |= PROT_EXEC;
1047
1048 flags = MAP_PRIVATE | MAP_DENYWRITE;
1049 if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
1050 flags |= MAP_EXECUTABLE;
1051
1052 maddr = 0;
1053
1054 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
1055 case ELF_FDPIC_FLAG_INDEPENDENT:
1056
1057 break;
1058
1059 case ELF_FDPIC_FLAG_HONOURVADDR:
1060
1061 maddr = phdr->p_vaddr;
1062 flags |= MAP_FIXED;
1063 break;
1064
1065 case ELF_FDPIC_FLAG_CONSTDISP:
1066
1067
1068
1069
1070 if (!dvset) {
1071 maddr = load_addr;
1072 delta_vaddr = phdr->p_vaddr;
1073 dvset = 1;
1074 } else {
1075 maddr = load_addr + phdr->p_vaddr - delta_vaddr;
1076 flags |= MAP_FIXED;
1077 }
1078 break;
1079
1080 case ELF_FDPIC_FLAG_CONTIGUOUS:
1081
1082 break;
1083
1084 default:
1085 BUG();
1086 }
1087
1088 maddr &= PAGE_MASK;
1089
1090
1091 disp = phdr->p_vaddr & ~PAGE_MASK;
1092 maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags,
1093 phdr->p_offset - disp);
1094
1095 kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx",
1096 loop, phdr->p_memsz + disp, prot, flags,
1097 phdr->p_offset - disp, maddr);
1098
1099 if (IS_ERR_VALUE(maddr))
1100 return (int) maddr;
1101
1102 if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
1103 ELF_FDPIC_FLAG_CONTIGUOUS)
1104 load_addr += PAGE_ALIGN(phdr->p_memsz + disp);
1105
1106 seg->addr = maddr + disp;
1107 seg->p_vaddr = phdr->p_vaddr;
1108 seg->p_memsz = phdr->p_memsz;
1109
1110
1111 if (phdr->p_offset == 0)
1112 params->elfhdr_addr = seg->addr;
1113
1114
1115
1116 if (prot & PROT_WRITE && disp > 0) {
1117 kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp);
1118 if (clear_user((void __user *) maddr, disp))
1119 return -EFAULT;
1120 maddr += disp;
1121 }
1122
1123
1124
1125
1126
1127
1128 excess = phdr->p_memsz - phdr->p_filesz;
1129 excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK);
1130
1131#ifdef CONFIG_MMU
1132 if (excess > excess1) {
1133 unsigned long xaddr = maddr + phdr->p_filesz + excess1;
1134 unsigned long xmaddr;
1135
1136 flags |= MAP_FIXED | MAP_ANONYMOUS;
1137 xmaddr = vm_mmap(NULL, xaddr, excess - excess1,
1138 prot, flags, 0);
1139
1140 kdebug("mmap[%d] <anon>"
1141 " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx",
1142 loop, xaddr, excess - excess1, prot, flags,
1143 xmaddr);
1144
1145 if (xmaddr != xaddr)
1146 return -ENOMEM;
1147 }
1148
1149 if (prot & PROT_WRITE && excess1 > 0) {
1150 kdebug("clear[%d] ad=%lx sz=%lx",
1151 loop, maddr + phdr->p_filesz, excess1);
1152 if (clear_user((void __user *) maddr + phdr->p_filesz,
1153 excess1))
1154 return -EFAULT;
1155 }
1156
1157#else
1158 if (excess > 0) {
1159 kdebug("clear[%d] ad=%lx sz=%lx",
1160 loop, maddr + phdr->p_filesz, excess);
1161 if (clear_user((void *) maddr + phdr->p_filesz, excess))
1162 return -EFAULT;
1163 }
1164#endif
1165
1166 if (mm) {
1167 if (phdr->p_flags & PF_X) {
1168 if (!mm->start_code) {
1169 mm->start_code = maddr;
1170 mm->end_code = maddr + phdr->p_memsz;
1171 }
1172 } else if (!mm->start_data) {
1173 mm->start_data = maddr;
1174 mm->end_data = maddr + phdr->p_memsz;
1175 }
1176 }
1177
1178 seg++;
1179 }
1180
1181 return 0;
1182}
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193#ifdef CONFIG_ELF_CORE
1194
1195struct elf_prstatus_fdpic
1196{
1197 struct elf_prstatus_common common;
1198 elf_gregset_t pr_reg;
1199
1200
1201
1202
1203
1204
1205 unsigned long pr_exec_fdpic_loadmap;
1206 unsigned long pr_interp_fdpic_loadmap;
1207 int pr_fpvalid;
1208};
1209
1210
1211struct memelfnote
1212{
1213 const char *name;
1214 int type;
1215 unsigned int datasz;
1216 void *data;
1217};
1218
1219static int notesize(struct memelfnote *en)
1220{
1221 int sz;
1222
1223 sz = sizeof(struct elf_note);
1224 sz += roundup(strlen(en->name) + 1, 4);
1225 sz += roundup(en->datasz, 4);
1226
1227 return sz;
1228}
1229
1230
1231
1232static int writenote(struct memelfnote *men, struct coredump_params *cprm)
1233{
1234 struct elf_note en;
1235 en.n_namesz = strlen(men->name) + 1;
1236 en.n_descsz = men->datasz;
1237 en.n_type = men->type;
1238
1239 return dump_emit(cprm, &en, sizeof(en)) &&
1240 dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&
1241 dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);
1242}
1243
1244static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
1245{
1246 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1247 elf->e_ident[EI_CLASS] = ELF_CLASS;
1248 elf->e_ident[EI_DATA] = ELF_DATA;
1249 elf->e_ident[EI_VERSION] = EV_CURRENT;
1250 elf->e_ident[EI_OSABI] = ELF_OSABI;
1251 memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
1252
1253 elf->e_type = ET_CORE;
1254 elf->e_machine = ELF_ARCH;
1255 elf->e_version = EV_CURRENT;
1256 elf->e_entry = 0;
1257 elf->e_phoff = sizeof(struct elfhdr);
1258 elf->e_shoff = 0;
1259 elf->e_flags = ELF_FDPIC_CORE_EFLAGS;
1260 elf->e_ehsize = sizeof(struct elfhdr);
1261 elf->e_phentsize = sizeof(struct elf_phdr);
1262 elf->e_phnum = segs;
1263 elf->e_shentsize = 0;
1264 elf->e_shnum = 0;
1265 elf->e_shstrndx = 0;
1266 return;
1267}
1268
1269static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1270{
1271 phdr->p_type = PT_NOTE;
1272 phdr->p_offset = offset;
1273 phdr->p_vaddr = 0;
1274 phdr->p_paddr = 0;
1275 phdr->p_filesz = sz;
1276 phdr->p_memsz = 0;
1277 phdr->p_flags = 0;
1278 phdr->p_align = 0;
1279 return;
1280}
1281
1282static inline void fill_note(struct memelfnote *note, const char *name, int type,
1283 unsigned int sz, void *data)
1284{
1285 note->name = name;
1286 note->type = type;
1287 note->datasz = sz;
1288 note->data = data;
1289 return;
1290}
1291
1292
1293
1294
1295
1296static void fill_prstatus(struct elf_prstatus_common *prstatus,
1297 struct task_struct *p, long signr)
1298{
1299 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1300 prstatus->pr_sigpend = p->pending.signal.sig[0];
1301 prstatus->pr_sighold = p->blocked.sig[0];
1302 rcu_read_lock();
1303 prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1304 rcu_read_unlock();
1305 prstatus->pr_pid = task_pid_vnr(p);
1306 prstatus->pr_pgrp = task_pgrp_vnr(p);
1307 prstatus->pr_sid = task_session_vnr(p);
1308 if (thread_group_leader(p)) {
1309 struct task_cputime cputime;
1310
1311
1312
1313
1314
1315 thread_group_cputime(p, &cputime);
1316 prstatus->pr_utime = ns_to_kernel_old_timeval(cputime.utime);
1317 prstatus->pr_stime = ns_to_kernel_old_timeval(cputime.stime);
1318 } else {
1319 u64 utime, stime;
1320
1321 task_cputime(p, &utime, &stime);
1322 prstatus->pr_utime = ns_to_kernel_old_timeval(utime);
1323 prstatus->pr_stime = ns_to_kernel_old_timeval(stime);
1324 }
1325 prstatus->pr_cutime = ns_to_kernel_old_timeval(p->signal->cutime);
1326 prstatus->pr_cstime = ns_to_kernel_old_timeval(p->signal->cstime);
1327}
1328
1329static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1330 struct mm_struct *mm)
1331{
1332 const struct cred *cred;
1333 unsigned int i, len;
1334
1335
1336 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1337
1338 len = mm->arg_end - mm->arg_start;
1339 if (len >= ELF_PRARGSZ)
1340 len = ELF_PRARGSZ - 1;
1341 if (copy_from_user(&psinfo->pr_psargs,
1342 (const char __user *) mm->arg_start, len))
1343 return -EFAULT;
1344 for (i = 0; i < len; i++)
1345 if (psinfo->pr_psargs[i] == 0)
1346 psinfo->pr_psargs[i] = ' ';
1347 psinfo->pr_psargs[len] = 0;
1348
1349 rcu_read_lock();
1350 psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1351 rcu_read_unlock();
1352 psinfo->pr_pid = task_pid_vnr(p);
1353 psinfo->pr_pgrp = task_pgrp_vnr(p);
1354 psinfo->pr_sid = task_session_vnr(p);
1355
1356 i = p->state ? ffz(~p->state) + 1 : 0;
1357 psinfo->pr_state = i;
1358 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1359 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1360 psinfo->pr_nice = task_nice(p);
1361 psinfo->pr_flag = p->flags;
1362 rcu_read_lock();
1363 cred = __task_cred(p);
1364 SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
1365 SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
1366 rcu_read_unlock();
1367 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1368
1369 return 0;
1370}
1371
1372
1373struct elf_thread_status
1374{
1375 struct elf_thread_status *next;
1376 struct elf_prstatus_fdpic prstatus;
1377 elf_fpregset_t fpu;
1378 struct memelfnote notes[2];
1379 int num_notes;
1380};
1381
1382
1383
1384
1385
1386
1387static struct elf_thread_status *elf_dump_thread_status(long signr, struct task_struct *p, int *sz)
1388{
1389 const struct user_regset_view *view = task_user_regset_view(p);
1390 struct elf_thread_status *t;
1391 int i, ret;
1392
1393 t = kzalloc(sizeof(struct elf_thread_status), GFP_KERNEL);
1394 if (!t)
1395 return t;
1396
1397 fill_prstatus(&t->prstatus.common, p, signr);
1398 t->prstatus.pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap;
1399 t->prstatus.pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap;
1400 regset_get(p, &view->regsets[0],
1401 sizeof(t->prstatus.pr_reg), &t->prstatus.pr_reg);
1402
1403 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1404 &t->prstatus);
1405 t->num_notes++;
1406 *sz += notesize(&t->notes[0]);
1407
1408 for (i = 1; i < view->n; ++i) {
1409 const struct user_regset *regset = &view->regsets[i];
1410 if (regset->core_note_type != NT_PRFPREG)
1411 continue;
1412 if (regset->active && regset->active(p, regset) <= 0)
1413 continue;
1414 ret = regset_get(p, regset, sizeof(t->fpu), &t->fpu);
1415 if (ret >= 0)
1416 t->prstatus.pr_fpvalid = 1;
1417 break;
1418 }
1419
1420 if (t->prstatus.pr_fpvalid) {
1421 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1422 &t->fpu);
1423 t->num_notes++;
1424 *sz += notesize(&t->notes[1]);
1425 }
1426 return t;
1427}
1428
1429static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
1430 elf_addr_t e_shoff, int segs)
1431{
1432 elf->e_shoff = e_shoff;
1433 elf->e_shentsize = sizeof(*shdr4extnum);
1434 elf->e_shnum = 1;
1435 elf->e_shstrndx = SHN_UNDEF;
1436
1437 memset(shdr4extnum, 0, sizeof(*shdr4extnum));
1438
1439 shdr4extnum->sh_type = SHT_NULL;
1440 shdr4extnum->sh_size = elf->e_shnum;
1441 shdr4extnum->sh_link = elf->e_shstrndx;
1442 shdr4extnum->sh_info = segs;
1443}
1444
1445
1446
1447
1448static bool elf_fdpic_dump_segments(struct coredump_params *cprm,
1449 struct core_vma_metadata *vma_meta,
1450 int vma_count)
1451{
1452 int i;
1453
1454 for (i = 0; i < vma_count; i++) {
1455 struct core_vma_metadata *meta = vma_meta + i;
1456
1457 if (!dump_user_range(cprm, meta->start, meta->dump_size))
1458 return false;
1459 }
1460 return true;
1461}
1462
1463
1464
1465
1466
1467
1468
1469
1470static int elf_fdpic_core_dump(struct coredump_params *cprm)
1471{
1472 int has_dumped = 0;
1473 int vma_count, segs;
1474 int i;
1475 struct elfhdr *elf = NULL;
1476 loff_t offset = 0, dataoff;
1477 struct memelfnote psinfo_note, auxv_note;
1478 struct elf_prpsinfo *psinfo = NULL;
1479 struct elf_thread_status *thread_list = NULL;
1480 int thread_status_size = 0;
1481 elf_addr_t *auxv;
1482 struct elf_phdr *phdr4note = NULL;
1483 struct elf_shdr *shdr4extnum = NULL;
1484 Elf_Half e_phnum;
1485 elf_addr_t e_shoff;
1486 struct core_thread *ct;
1487 struct elf_thread_status *tmp;
1488 struct core_vma_metadata *vma_meta = NULL;
1489 size_t vma_data_size;
1490
1491
1492 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1493 if (!elf)
1494 goto end_coredump;
1495 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1496 if (!psinfo)
1497 goto end_coredump;
1498
1499 if (dump_vma_snapshot(cprm, &vma_count, &vma_meta, &vma_data_size))
1500 goto end_coredump;
1501
1502 for (ct = current->mm->core_state->dumper.next;
1503 ct; ct = ct->next) {
1504 tmp = elf_dump_thread_status(cprm->siginfo->si_signo,
1505 ct->task, &thread_status_size);
1506 if (!tmp)
1507 goto end_coredump;
1508
1509 tmp->next = thread_list;
1510 thread_list = tmp;
1511 }
1512
1513
1514 tmp = elf_dump_thread_status(cprm->siginfo->si_signo,
1515 current, &thread_status_size);
1516 if (!tmp)
1517 goto end_coredump;
1518 tmp->next = thread_list;
1519 thread_list = tmp;
1520
1521 segs = vma_count + elf_core_extra_phdrs();
1522
1523
1524 segs++;
1525
1526
1527
1528
1529 e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
1530
1531
1532 fill_elf_fdpic_header(elf, e_phnum);
1533
1534 has_dumped = 1;
1535
1536
1537
1538
1539
1540 fill_psinfo(psinfo, current->group_leader, current->mm);
1541 fill_note(&psinfo_note, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1542 thread_status_size += notesize(&psinfo_note);
1543
1544 auxv = (elf_addr_t *) current->mm->saved_auxv;
1545 i = 0;
1546 do
1547 i += 2;
1548 while (auxv[i - 2] != AT_NULL);
1549 fill_note(&auxv_note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);
1550 thread_status_size += notesize(&auxv_note);
1551
1552 offset = sizeof(*elf);
1553 offset += segs * sizeof(struct elf_phdr);
1554
1555
1556 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
1557 if (!phdr4note)
1558 goto end_coredump;
1559
1560 fill_elf_note_phdr(phdr4note, thread_status_size, offset);
1561 offset += thread_status_size;
1562
1563
1564 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1565
1566 offset += vma_data_size;
1567 offset += elf_core_extra_data_size();
1568 e_shoff = offset;
1569
1570 if (e_phnum == PN_XNUM) {
1571 shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
1572 if (!shdr4extnum)
1573 goto end_coredump;
1574 fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
1575 }
1576
1577 offset = dataoff;
1578
1579 if (!dump_emit(cprm, elf, sizeof(*elf)))
1580 goto end_coredump;
1581
1582 if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note)))
1583 goto end_coredump;
1584
1585
1586 for (i = 0; i < vma_count; i++) {
1587 struct core_vma_metadata *meta = vma_meta + i;
1588 struct elf_phdr phdr;
1589 size_t sz;
1590
1591 sz = meta->end - meta->start;
1592
1593 phdr.p_type = PT_LOAD;
1594 phdr.p_offset = offset;
1595 phdr.p_vaddr = meta->start;
1596 phdr.p_paddr = 0;
1597 phdr.p_filesz = meta->dump_size;
1598 phdr.p_memsz = sz;
1599 offset += phdr.p_filesz;
1600 phdr.p_flags = 0;
1601 if (meta->flags & VM_READ)
1602 phdr.p_flags |= PF_R;
1603 if (meta->flags & VM_WRITE)
1604 phdr.p_flags |= PF_W;
1605 if (meta->flags & VM_EXEC)
1606 phdr.p_flags |= PF_X;
1607 phdr.p_align = ELF_EXEC_PAGESIZE;
1608
1609 if (!dump_emit(cprm, &phdr, sizeof(phdr)))
1610 goto end_coredump;
1611 }
1612
1613 if (!elf_core_write_extra_phdrs(cprm, offset))
1614 goto end_coredump;
1615
1616
1617 if (!writenote(thread_list->notes, cprm))
1618 goto end_coredump;
1619 if (!writenote(&psinfo_note, cprm))
1620 goto end_coredump;
1621 if (!writenote(&auxv_note, cprm))
1622 goto end_coredump;
1623 for (i = 1; i < thread_list->num_notes; i++)
1624 if (!writenote(thread_list->notes + i, cprm))
1625 goto end_coredump;
1626
1627
1628 for (tmp = thread_list->next; tmp; tmp = tmp->next) {
1629 for (i = 0; i < tmp->num_notes; i++)
1630 if (!writenote(&tmp->notes[i], cprm))
1631 goto end_coredump;
1632 }
1633
1634 if (!dump_skip(cprm, dataoff - cprm->pos))
1635 goto end_coredump;
1636
1637 if (!elf_fdpic_dump_segments(cprm, vma_meta, vma_count))
1638 goto end_coredump;
1639
1640 if (!elf_core_write_extra_data(cprm))
1641 goto end_coredump;
1642
1643 if (e_phnum == PN_XNUM) {
1644 if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum)))
1645 goto end_coredump;
1646 }
1647
1648 if (cprm->file->f_pos != offset) {
1649
1650 printk(KERN_WARNING
1651 "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
1652 cprm->file->f_pos, offset);
1653 }
1654
1655end_coredump:
1656 while (thread_list) {
1657 tmp = thread_list;
1658 thread_list = thread_list->next;
1659 kfree(tmp);
1660 }
1661 kvfree(vma_meta);
1662 kfree(phdr4note);
1663 kfree(elf);
1664 kfree(psinfo);
1665 kfree(shdr4extnum);
1666 return has_dumped;
1667}
1668
1669#endif
1670