2 * linux/fs/binfmt_elf.c
4 * These are the functions used to load ELF format executables as used
5 * on SVr4 machines. Information on the format may be found in the book
6 * "UNIX SYSTEM V RELEASE 4 Programmers Guide: Ansi C and Programming Support
9 * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).
12 #include <linux/module.h>
13 #include <linux/kernel.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/sched/coredump.h>
39 #include <linux/sched/task_stack.h>
40 #include <linux/sched/cputime.h>
41 #include <linux/cred.h>
42 #include <linux/dax.h>
43 #include <linux/uaccess.h>
44 #include <asm/param.h>
48 #define user_long_t long
50 #ifndef user_siginfo_t
51 #define user_siginfo_t siginfo_t
54 /* That's for binfmt_elf_fdpic to deal with */
55 #ifndef elf_check_fdpic
56 #define elf_check_fdpic(ex) false
59 static int load_elf_binary(struct linux_binprm
*bprm
);
60 static unsigned long elf_map(struct file
*, unsigned long, struct elf_phdr
*,
61 int, int, unsigned long);
64 static int load_elf_library(struct file
*);
66 #define load_elf_library NULL
70 * If we don't support core dumping, then supply a NULL so we
73 #ifdef CONFIG_ELF_CORE
74 static int elf_core_dump(struct coredump_params
*cprm
);
76 #define elf_core_dump NULL
79 #if ELF_EXEC_PAGESIZE > PAGE_SIZE
80 #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE
82 #define ELF_MIN_ALIGN PAGE_SIZE
85 #ifndef ELF_CORE_EFLAGS
86 #define ELF_CORE_EFLAGS 0
89 #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
90 #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
91 #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
93 static struct linux_binfmt elf_format
= {
94 .module
= THIS_MODULE
,
95 .load_binary
= load_elf_binary
,
96 .load_shlib
= load_elf_library
,
97 .core_dump
= elf_core_dump
,
98 .min_coredump
= ELF_EXEC_PAGESIZE
,
101 #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
103 static int set_brk(unsigned long start
, unsigned long end
, int prot
)
105 start
= ELF_PAGEALIGN(start
);
106 end
= ELF_PAGEALIGN(end
);
109 * Map the last of the bss segment.
110 * If the header is requesting these pages to be
111 * executable, honour that (ppc32 needs this).
113 int error
= vm_brk_flags(start
, end
- start
,
114 prot
& PROT_EXEC
? VM_EXEC
: 0);
118 current
->mm
->start_brk
= current
->mm
->brk
= end
;
122 /* We need to explicitly zero any fractional pages
123 after the data section (i.e. bss). This would
124 contain the junk from the file that should not
127 static int padzero(unsigned long elf_bss
)
131 nbyte
= ELF_PAGEOFFSET(elf_bss
);
133 nbyte
= ELF_MIN_ALIGN
- nbyte
;
134 if (clear_user((void __user
*) elf_bss
, nbyte
))
140 /* Let's use some macros to make this stack manipulation a little clearer */
141 #ifdef CONFIG_STACK_GROWSUP
142 #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
143 #define STACK_ROUND(sp, items) \
144 ((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
145 #define STACK_ALLOC(sp, len) ({ \
146 elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \
149 #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
150 #define STACK_ROUND(sp, items) \
151 (((unsigned long) (sp - items)) &~ 15UL)
152 #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
155 #ifndef ELF_BASE_PLATFORM
157 * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
158 * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
159 * will be copied to the user stack in the same manner as AT_PLATFORM.
161 #define ELF_BASE_PLATFORM NULL
165 create_elf_tables(struct linux_binprm
*bprm
, struct elfhdr
*exec
,
166 unsigned long load_addr
, unsigned long interp_load_addr
)
168 unsigned long p
= bprm
->p
;
169 int argc
= bprm
->argc
;
170 int envc
= bprm
->envc
;
171 elf_addr_t __user
*sp
;
172 elf_addr_t __user
*u_platform
;
173 elf_addr_t __user
*u_base_platform
;
174 elf_addr_t __user
*u_rand_bytes
;
175 const char *k_platform
= ELF_PLATFORM
;
176 const char *k_base_platform
= ELF_BASE_PLATFORM
;
177 unsigned char k_rand_bytes
[16];
179 elf_addr_t
*elf_info
;
181 const struct cred
*cred
= current_cred();
182 struct vm_area_struct
*vma
;
185 * In some cases (e.g. Hyper-Threading), we want to avoid L1
186 * evictions by the processes running on the same package. One
187 * thing we can do is to shuffle the initial stack for them.
190 p
= arch_align_stack(p
);
193 * If this architecture has a platform capability string, copy it
194 * to userspace. In some cases (Sparc), this info is impossible
195 * for userspace to get any other way, in others (i386) it is
200 size_t len
= strlen(k_platform
) + 1;
202 u_platform
= (elf_addr_t __user
*)STACK_ALLOC(p
, len
);
203 if (__copy_to_user(u_platform
, k_platform
, len
))
208 * If this architecture has a "base" platform capability
209 * string, copy it to userspace.
211 u_base_platform
= NULL
;
212 if (k_base_platform
) {
213 size_t len
= strlen(k_base_platform
) + 1;
215 u_base_platform
= (elf_addr_t __user
*)STACK_ALLOC(p
, len
);
216 if (__copy_to_user(u_base_platform
, k_base_platform
, len
))
221 * Generate 16 random bytes for userspace PRNG seeding.
223 get_random_bytes(k_rand_bytes
, sizeof(k_rand_bytes
));
224 u_rand_bytes
= (elf_addr_t __user
*)
225 STACK_ALLOC(p
, sizeof(k_rand_bytes
));
226 if (__copy_to_user(u_rand_bytes
, k_rand_bytes
, sizeof(k_rand_bytes
)))
229 /* Create the ELF interpreter info */
230 elf_info
= (elf_addr_t
*)current
->mm
->saved_auxv
;
231 /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */
232 #define NEW_AUX_ENT(id, val) \
234 elf_info[ei_index++] = id; \
235 elf_info[ei_index++] = val; \
240 * ARCH_DLINFO must come first so PPC can do its special alignment of
242 * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in
243 * ARCH_DLINFO changes
247 NEW_AUX_ENT(AT_HWCAP
, ELF_HWCAP
);
248 NEW_AUX_ENT(AT_PAGESZ
, ELF_EXEC_PAGESIZE
);
249 NEW_AUX_ENT(AT_CLKTCK
, CLOCKS_PER_SEC
);
250 NEW_AUX_ENT(AT_PHDR
, load_addr
+ exec
->e_phoff
);
251 NEW_AUX_ENT(AT_PHENT
, sizeof(struct elf_phdr
));
252 NEW_AUX_ENT(AT_PHNUM
, exec
->e_phnum
);
253 NEW_AUX_ENT(AT_BASE
, interp_load_addr
);
254 NEW_AUX_ENT(AT_FLAGS
, 0);
255 NEW_AUX_ENT(AT_ENTRY
, exec
->e_entry
);
256 NEW_AUX_ENT(AT_UID
, from_kuid_munged(cred
->user_ns
, cred
->uid
));
257 NEW_AUX_ENT(AT_EUID
, from_kuid_munged(cred
->user_ns
, cred
->euid
));
258 NEW_AUX_ENT(AT_GID
, from_kgid_munged(cred
->user_ns
, cred
->gid
));
259 NEW_AUX_ENT(AT_EGID
, from_kgid_munged(cred
->user_ns
, cred
->egid
));
260 NEW_AUX_ENT(AT_SECURE
, bprm
->secureexec
);
261 NEW_AUX_ENT(AT_RANDOM
, (elf_addr_t
)(unsigned long)u_rand_bytes
);
263 NEW_AUX_ENT(AT_HWCAP2
, ELF_HWCAP2
);
265 NEW_AUX_ENT(AT_EXECFN
, bprm
->exec
);
267 NEW_AUX_ENT(AT_PLATFORM
,
268 (elf_addr_t
)(unsigned long)u_platform
);
270 if (k_base_platform
) {
271 NEW_AUX_ENT(AT_BASE_PLATFORM
,
272 (elf_addr_t
)(unsigned long)u_base_platform
);
274 if (bprm
->interp_flags
& BINPRM_FLAGS_EXECFD
) {
275 NEW_AUX_ENT(AT_EXECFD
, bprm
->interp_data
);
278 /* AT_NULL is zero; clear the rest too */
279 memset(&elf_info
[ei_index
], 0,
280 sizeof current
->mm
->saved_auxv
- ei_index
* sizeof elf_info
[0]);
282 /* And advance past the AT_NULL entry. */
285 sp
= STACK_ADD(p
, ei_index
);
287 items
= (argc
+ 1) + (envc
+ 1) + 1;
288 bprm
->p
= STACK_ROUND(sp
, items
);
290 /* Point sp at the lowest address on the stack */
291 #ifdef CONFIG_STACK_GROWSUP
292 sp
= (elf_addr_t __user
*)bprm
->p
- items
- ei_index
;
293 bprm
->exec
= (unsigned long)sp
; /* XXX: PARISC HACK */
295 sp
= (elf_addr_t __user
*)bprm
->p
;
300 * Grow the stack manually; some architectures have a limit on how
301 * far ahead a user-space access may be in order to grow the stack.
303 vma
= find_extend_vma(current
->mm
, bprm
->p
);
307 /* Now, let's put argc (and argv, envp if appropriate) on the stack */
308 if (__put_user(argc
, sp
++))
311 /* Populate list of argv pointers back to argv strings. */
312 p
= current
->mm
->arg_end
= current
->mm
->arg_start
;
315 if (__put_user((elf_addr_t
)p
, sp
++))
317 len
= strnlen_user((void __user
*)p
, MAX_ARG_STRLEN
);
318 if (!len
|| len
> MAX_ARG_STRLEN
)
322 if (__put_user(0, sp
++))
324 current
->mm
->arg_end
= p
;
326 /* Populate list of envp pointers back to envp strings. */
327 current
->mm
->env_end
= current
->mm
->env_start
= p
;
330 if (__put_user((elf_addr_t
)p
, sp
++))
332 len
= strnlen_user((void __user
*)p
, MAX_ARG_STRLEN
);
333 if (!len
|| len
> MAX_ARG_STRLEN
)
337 if (__put_user(0, sp
++))
339 current
->mm
->env_end
= p
;
341 /* Put the elf_info on the stack in the right place. */
342 if (copy_to_user(sp
, elf_info
, ei_index
* sizeof(elf_addr_t
)))
349 static unsigned long elf_map(struct file
*filep
, unsigned long addr
,
350 struct elf_phdr
*eppnt
, int prot
, int type
,
351 unsigned long total_size
)
353 unsigned long map_addr
;
354 unsigned long size
= eppnt
->p_filesz
+ ELF_PAGEOFFSET(eppnt
->p_vaddr
);
355 unsigned long off
= eppnt
->p_offset
- ELF_PAGEOFFSET(eppnt
->p_vaddr
);
356 addr
= ELF_PAGESTART(addr
);
357 size
= ELF_PAGEALIGN(size
);
359 /* mmap() will return -EINVAL if given a zero size, but a
360 * segment with zero filesize is perfectly valid */
365 * total_size is the size of the ELF (interpreter) image.
366 * The _first_ mmap needs to know the full size, otherwise
367 * randomization might put this image into an overlapping
368 * position with the ELF binary image. (since size < total_size)
369 * So we first map the 'big' image - and unmap the remainder at
370 * the end. (which unmap is needed for ELF images with holes.)
373 total_size
= ELF_PAGEALIGN(total_size
);
374 map_addr
= vm_mmap(filep
, addr
, total_size
, prot
, type
, off
);
375 if (!BAD_ADDR(map_addr
))
376 vm_munmap(map_addr
+size
, total_size
-size
);
378 map_addr
= vm_mmap(filep
, addr
, size
, prot
, type
, off
);
383 #endif /* !elf_map */
385 static unsigned long total_mapping_size(struct elf_phdr
*cmds
, int nr
)
387 int i
, first_idx
= -1, last_idx
= -1;
389 for (i
= 0; i
< nr
; i
++) {
390 if (cmds
[i
].p_type
== PT_LOAD
) {
399 return cmds
[last_idx
].p_vaddr
+ cmds
[last_idx
].p_memsz
-
400 ELF_PAGESTART(cmds
[first_idx
].p_vaddr
);
404 * load_elf_phdrs() - load ELF program headers
405 * @elf_ex: ELF header of the binary whose program headers should be loaded
406 * @elf_file: the opened ELF binary file
408 * Loads ELF program headers from the binary file elf_file, which has the ELF
409 * header pointed to by elf_ex, into a newly allocated array. The caller is
410 * responsible for freeing the allocated data. Returns an ERR_PTR upon failure.
412 static struct elf_phdr
*load_elf_phdrs(struct elfhdr
*elf_ex
,
413 struct file
*elf_file
)
415 struct elf_phdr
*elf_phdata
= NULL
;
416 int retval
, size
, err
= -1;
417 loff_t pos
= elf_ex
->e_phoff
;
420 * If the size of this structure has changed, then punt, since
421 * we will be doing the wrong thing.
423 if (elf_ex
->e_phentsize
!= sizeof(struct elf_phdr
))
426 /* Sanity check the number of program headers... */
427 if (elf_ex
->e_phnum
< 1 ||
428 elf_ex
->e_phnum
> 65536U / sizeof(struct elf_phdr
))
431 /* ...and their total size. */
432 size
= sizeof(struct elf_phdr
) * elf_ex
->e_phnum
;
433 if (size
> ELF_MIN_ALIGN
)
436 elf_phdata
= kmalloc(size
, GFP_KERNEL
);
440 /* Read in the program headers */
441 retval
= kernel_read(elf_file
, elf_phdata
, size
, &pos
);
442 if (retval
!= size
) {
443 err
= (retval
< 0) ? retval
: -EIO
;
457 #ifndef CONFIG_ARCH_BINFMT_ELF_STATE
460 * struct arch_elf_state - arch-specific ELF loading state
462 * This structure is used to preserve architecture specific data during
463 * the loading of an ELF file, throughout the checking of architecture
464 * specific ELF headers & through to the point where the ELF load is
465 * known to be proceeding (ie. SET_PERSONALITY).
467 * This implementation is a dummy for architectures which require no
470 struct arch_elf_state
{
473 #define INIT_ARCH_ELF_STATE {}
476 * arch_elf_pt_proc() - check a PT_LOPROC..PT_HIPROC ELF program header
477 * @ehdr: The main ELF header
478 * @phdr: The program header to check
479 * @elf: The open ELF file
480 * @is_interp: True if the phdr is from the interpreter of the ELF being
481 * loaded, else false.
482 * @state: Architecture-specific state preserved throughout the process
483 * of loading the ELF.
485 * Inspects the program header phdr to validate its correctness and/or
486 * suitability for the system. Called once per ELF program header in the
487 * range PT_LOPROC to PT_HIPROC, for both the ELF being loaded and its
490 * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load
491 * with that return code.
493 static inline int arch_elf_pt_proc(struct elfhdr
*ehdr
,
494 struct elf_phdr
*phdr
,
495 struct file
*elf
, bool is_interp
,
496 struct arch_elf_state
*state
)
498 /* Dummy implementation, always proceed */
503 * arch_check_elf() - check an ELF executable
504 * @ehdr: The main ELF header
505 * @has_interp: True if the ELF has an interpreter, else false.
506 * @interp_ehdr: The interpreter's ELF header
507 * @state: Architecture-specific state preserved throughout the process
508 * of loading the ELF.
510 * Provides a final opportunity for architecture code to reject the loading
511 * of the ELF & cause an exec syscall to return an error. This is called after
512 * all program headers to be checked by arch_elf_pt_proc have been.
514 * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load
515 * with that return code.
517 static inline int arch_check_elf(struct elfhdr
*ehdr
, bool has_interp
,
518 struct elfhdr
*interp_ehdr
,
519 struct arch_elf_state
*state
)
521 /* Dummy implementation, always proceed */
525 #endif /* !CONFIG_ARCH_BINFMT_ELF_STATE */
527 /* This is much more generalized than the library routine read function,
528 so we keep this separate. Technically the library read function
529 is only provided so that we can read a.out libraries that have
532 static unsigned long load_elf_interp(struct elfhdr
*interp_elf_ex
,
533 struct file
*interpreter
, unsigned long *interp_map_addr
,
534 unsigned long no_base
, struct elf_phdr
*interp_elf_phdata
)
536 struct elf_phdr
*eppnt
;
537 unsigned long load_addr
= 0;
538 int load_addr_set
= 0;
539 unsigned long last_bss
= 0, elf_bss
= 0;
541 unsigned long error
= ~0UL;
542 unsigned long total_size
;
545 /* First of all, some simple consistency checks */
546 if (interp_elf_ex
->e_type
!= ET_EXEC
&&
547 interp_elf_ex
->e_type
!= ET_DYN
)
549 if (!elf_check_arch(interp_elf_ex
) ||
550 elf_check_fdpic(interp_elf_ex
))
552 if (!interpreter
->f_op
->mmap
)
555 total_size
= total_mapping_size(interp_elf_phdata
,
556 interp_elf_ex
->e_phnum
);
562 eppnt
= interp_elf_phdata
;
563 for (i
= 0; i
< interp_elf_ex
->e_phnum
; i
++, eppnt
++) {
564 if (eppnt
->p_type
== PT_LOAD
) {
565 int elf_type
= MAP_PRIVATE
| MAP_DENYWRITE
;
567 unsigned long vaddr
= 0;
568 unsigned long k
, map_addr
;
570 if (eppnt
->p_flags
& PF_R
)
571 elf_prot
= PROT_READ
;
572 if (eppnt
->p_flags
& PF_W
)
573 elf_prot
|= PROT_WRITE
;
574 if (eppnt
->p_flags
& PF_X
)
575 elf_prot
|= PROT_EXEC
;
576 vaddr
= eppnt
->p_vaddr
;
577 if (interp_elf_ex
->e_type
== ET_EXEC
|| load_addr_set
)
578 elf_type
|= MAP_FIXED
;
579 else if (no_base
&& interp_elf_ex
->e_type
== ET_DYN
)
582 map_addr
= elf_map(interpreter
, load_addr
+ vaddr
,
583 eppnt
, elf_prot
, elf_type
, total_size
);
585 if (!*interp_map_addr
)
586 *interp_map_addr
= map_addr
;
588 if (BAD_ADDR(map_addr
))
591 if (!load_addr_set
&&
592 interp_elf_ex
->e_type
== ET_DYN
) {
593 load_addr
= map_addr
- ELF_PAGESTART(vaddr
);
598 * Check to see if the section's size will overflow the
599 * allowed task size. Note that p_filesz must always be
600 * <= p_memsize so it's only necessary to check p_memsz.
602 k
= load_addr
+ eppnt
->p_vaddr
;
604 eppnt
->p_filesz
> eppnt
->p_memsz
||
605 eppnt
->p_memsz
> TASK_SIZE
||
606 TASK_SIZE
- eppnt
->p_memsz
< k
) {
612 * Find the end of the file mapping for this phdr, and
613 * keep track of the largest address we see for this.
615 k
= load_addr
+ eppnt
->p_vaddr
+ eppnt
->p_filesz
;
620 * Do the same thing for the memory mapping - between
621 * elf_bss and last_bss is the bss section.
623 k
= load_addr
+ eppnt
->p_vaddr
+ eppnt
->p_memsz
;
632 * Now fill out the bss section: first pad the last page from
633 * the file up to the page boundary, and zero it from elf_bss
634 * up to the end of the page.
636 if (padzero(elf_bss
)) {
641 * Next, align both the file and mem bss up to the page size,
642 * since this is where elf_bss was just zeroed up to, and where
643 * last_bss will end after the vm_brk_flags() below.
645 elf_bss
= ELF_PAGEALIGN(elf_bss
);
646 last_bss
= ELF_PAGEALIGN(last_bss
);
647 /* Finally, if there is still more bss to allocate, do it. */
648 if (last_bss
> elf_bss
) {
649 error
= vm_brk_flags(elf_bss
, last_bss
- elf_bss
,
650 bss_prot
& PROT_EXEC
? VM_EXEC
: 0);
661 * These are the functions used to load ELF style executables and shared
662 * libraries. There is no binary dependent code anywhere else.
665 #ifndef STACK_RND_MASK
666 #define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) /* 8MB of VA */
669 static unsigned long randomize_stack_top(unsigned long stack_top
)
671 unsigned long random_variable
= 0;
673 if (current
->flags
& PF_RANDOMIZE
) {
674 random_variable
= get_random_long();
675 random_variable
&= STACK_RND_MASK
;
676 random_variable
<<= PAGE_SHIFT
;
678 #ifdef CONFIG_STACK_GROWSUP
679 return PAGE_ALIGN(stack_top
) + random_variable
;
681 return PAGE_ALIGN(stack_top
) - random_variable
;
685 static int load_elf_binary(struct linux_binprm
*bprm
)
687 struct file
*interpreter
= NULL
; /* to shut gcc up */
688 unsigned long load_addr
= 0, load_bias
= 0;
689 int load_addr_set
= 0;
690 char * elf_interpreter
= NULL
;
692 struct elf_phdr
*elf_ppnt
, *elf_phdata
, *interp_elf_phdata
= NULL
;
693 unsigned long elf_bss
, elf_brk
;
696 unsigned long elf_entry
;
697 unsigned long interp_load_addr
= 0;
698 unsigned long start_code
, end_code
, start_data
, end_data
;
699 unsigned long reloc_func_desc __maybe_unused
= 0;
700 int executable_stack
= EXSTACK_DEFAULT
;
701 struct pt_regs
*regs
= current_pt_regs();
703 struct elfhdr elf_ex
;
704 struct elfhdr interp_elf_ex
;
706 struct arch_elf_state arch_state
= INIT_ARCH_ELF_STATE
;
709 loc
= kmalloc(sizeof(*loc
), GFP_KERNEL
);
715 /* Get the exec-header */
716 loc
->elf_ex
= *((struct elfhdr
*)bprm
->buf
);
719 /* First of all, some simple consistency checks */
720 if (memcmp(loc
->elf_ex
.e_ident
, ELFMAG
, SELFMAG
) != 0)
723 if (loc
->elf_ex
.e_type
!= ET_EXEC
&& loc
->elf_ex
.e_type
!= ET_DYN
)
725 if (!elf_check_arch(&loc
->elf_ex
))
727 if (elf_check_fdpic(&loc
->elf_ex
))
729 if (!bprm
->file
->f_op
->mmap
)
732 elf_phdata
= load_elf_phdrs(&loc
->elf_ex
, bprm
->file
);
736 elf_ppnt
= elf_phdata
;
745 for (i
= 0; i
< loc
->elf_ex
.e_phnum
; i
++) {
746 if (elf_ppnt
->p_type
== PT_INTERP
) {
747 /* This is the program interpreter used for
748 * shared libraries - for now assume that this
749 * is an a.out format binary
752 if (elf_ppnt
->p_filesz
> PATH_MAX
||
753 elf_ppnt
->p_filesz
< 2)
757 elf_interpreter
= kmalloc(elf_ppnt
->p_filesz
,
759 if (!elf_interpreter
)
762 pos
= elf_ppnt
->p_offset
;
763 retval
= kernel_read(bprm
->file
, elf_interpreter
,
764 elf_ppnt
->p_filesz
, &pos
);
765 if (retval
!= elf_ppnt
->p_filesz
) {
768 goto out_free_interp
;
770 /* make sure path is NULL terminated */
772 if (elf_interpreter
[elf_ppnt
->p_filesz
- 1] != '\0')
773 goto out_free_interp
;
775 interpreter
= open_exec(elf_interpreter
);
776 retval
= PTR_ERR(interpreter
);
777 if (IS_ERR(interpreter
))
778 goto out_free_interp
;
781 * If the binary is not readable then enforce
782 * mm->dumpable = 0 regardless of the interpreter's
785 would_dump(bprm
, interpreter
);
787 /* Get the exec headers */
789 retval
= kernel_read(interpreter
, &loc
->interp_elf_ex
,
790 sizeof(loc
->interp_elf_ex
), &pos
);
791 if (retval
!= sizeof(loc
->interp_elf_ex
)) {
794 goto out_free_dentry
;
802 elf_ppnt
= elf_phdata
;
803 for (i
= 0; i
< loc
->elf_ex
.e_phnum
; i
++, elf_ppnt
++)
804 switch (elf_ppnt
->p_type
) {
806 if (elf_ppnt
->p_flags
& PF_X
)
807 executable_stack
= EXSTACK_ENABLE_X
;
809 executable_stack
= EXSTACK_DISABLE_X
;
812 case PT_LOPROC
... PT_HIPROC
:
813 retval
= arch_elf_pt_proc(&loc
->elf_ex
, elf_ppnt
,
817 goto out_free_dentry
;
821 /* Some simple consistency checks for the interpreter */
822 if (elf_interpreter
) {
824 /* Not an ELF interpreter */
825 if (memcmp(loc
->interp_elf_ex
.e_ident
, ELFMAG
, SELFMAG
) != 0)
826 goto out_free_dentry
;
827 /* Verify the interpreter has a valid arch */
828 if (!elf_check_arch(&loc
->interp_elf_ex
) ||
829 elf_check_fdpic(&loc
->interp_elf_ex
))
830 goto out_free_dentry
;
832 /* Load the interpreter program headers */
833 interp_elf_phdata
= load_elf_phdrs(&loc
->interp_elf_ex
,
835 if (!interp_elf_phdata
)
836 goto out_free_dentry
;
838 /* Pass PT_LOPROC..PT_HIPROC headers to arch code */
839 elf_ppnt
= interp_elf_phdata
;
840 for (i
= 0; i
< loc
->interp_elf_ex
.e_phnum
; i
++, elf_ppnt
++)
841 switch (elf_ppnt
->p_type
) {
842 case PT_LOPROC
... PT_HIPROC
:
843 retval
= arch_elf_pt_proc(&loc
->interp_elf_ex
,
844 elf_ppnt
, interpreter
,
847 goto out_free_dentry
;
853 * Allow arch code to reject the ELF at this point, whilst it's
854 * still possible to return an error to the code that invoked
857 retval
= arch_check_elf(&loc
->elf_ex
,
858 !!interpreter
, &loc
->interp_elf_ex
,
861 goto out_free_dentry
;
863 /* Flush all traces of the currently running executable */
864 retval
= flush_old_exec(bprm
);
866 goto out_free_dentry
;
868 /* Do this immediately, since STACK_TOP as used in setup_arg_pages
869 may depend on the personality. */
870 SET_PERSONALITY2(loc
->elf_ex
, &arch_state
);
871 if (elf_read_implies_exec(loc
->elf_ex
, executable_stack
))
872 current
->personality
|= READ_IMPLIES_EXEC
;
874 if (!(current
->personality
& ADDR_NO_RANDOMIZE
) && randomize_va_space
)
875 current
->flags
|= PF_RANDOMIZE
;
877 setup_new_exec(bprm
);
878 install_exec_creds(bprm
);
880 /* Do this so that we can load the interpreter, if need be. We will
881 change some of these later */
882 retval
= setup_arg_pages(bprm
, randomize_stack_top(STACK_TOP
),
885 goto out_free_dentry
;
887 current
->mm
->start_stack
= bprm
->p
;
889 /* Now we do a little grungy work by mmapping the ELF image into
890 the correct location in memory. */
891 for(i
= 0, elf_ppnt
= elf_phdata
;
892 i
< loc
->elf_ex
.e_phnum
; i
++, elf_ppnt
++) {
893 int elf_prot
= 0, elf_flags
;
894 unsigned long k
, vaddr
;
895 unsigned long total_size
= 0;
897 if (elf_ppnt
->p_type
!= PT_LOAD
)
900 if (unlikely (elf_brk
> elf_bss
)) {
903 /* There was a PT_LOAD segment with p_memsz > p_filesz
904 before this one. Map anonymous pages, if needed,
905 and clear the area. */
906 retval
= set_brk(elf_bss
+ load_bias
,
910 goto out_free_dentry
;
911 nbyte
= ELF_PAGEOFFSET(elf_bss
);
913 nbyte
= ELF_MIN_ALIGN
- nbyte
;
914 if (nbyte
> elf_brk
- elf_bss
)
915 nbyte
= elf_brk
- elf_bss
;
916 if (clear_user((void __user
*)elf_bss
+
919 * This bss-zeroing can fail if the ELF
920 * file specifies odd protections. So
921 * we don't check the return value
927 if (elf_ppnt
->p_flags
& PF_R
)
928 elf_prot
|= PROT_READ
;
929 if (elf_ppnt
->p_flags
& PF_W
)
930 elf_prot
|= PROT_WRITE
;
931 if (elf_ppnt
->p_flags
& PF_X
)
932 elf_prot
|= PROT_EXEC
;
934 elf_flags
= MAP_PRIVATE
| MAP_DENYWRITE
| MAP_EXECUTABLE
;
936 vaddr
= elf_ppnt
->p_vaddr
;
938 * If we are loading ET_EXEC or we have already performed
939 * the ET_DYN load_addr calculations, proceed normally.
941 if (loc
->elf_ex
.e_type
== ET_EXEC
|| load_addr_set
) {
942 elf_flags
|= MAP_FIXED
;
943 } else if (loc
->elf_ex
.e_type
== ET_DYN
) {
945 * This logic is run once for the first LOAD Program
946 * Header for ET_DYN binaries to calculate the
947 * randomization (load_bias) for all the LOAD
948 * Program Headers, and to calculate the entire
949 * size of the ELF mapping (total_size). (Note that
950 * load_addr_set is set to true later once the
951 * initial mapping is performed.)
953 * There are effectively two types of ET_DYN
954 * binaries: programs (i.e. PIE: ET_DYN with INTERP)
955 * and loaders (ET_DYN without INTERP, since they
956 * _are_ the ELF interpreter). The loaders must
957 * be loaded away from programs since the program
958 * may otherwise collide with the loader (especially
959 * for ET_EXEC which does not have a randomized
960 * position). For example to handle invocations of
961 * "./ld.so someprog" to test out a new version of
962 * the loader, the subsequent program that the
963 * loader loads must avoid the loader itself, so
964 * they cannot share the same load range. Sufficient
965 * room for the brk must be allocated with the
966 * loader as well, since brk must be available with
969 * Therefore, programs are loaded offset from
970 * ELF_ET_DYN_BASE and loaders are loaded into the
971 * independently randomized mmap region (0 load_bias
972 * without MAP_FIXED).
974 if (elf_interpreter
) {
975 load_bias
= ELF_ET_DYN_BASE
;
976 if (current
->flags
& PF_RANDOMIZE
)
977 load_bias
+= arch_mmap_rnd();
978 elf_flags
|= MAP_FIXED
;
983 * Since load_bias is used for all subsequent loading
984 * calculations, we must lower it by the first vaddr
985 * so that the remaining calculations based on the
986 * ELF vaddrs will be correctly offset. The result
987 * is then page aligned.
989 load_bias
= ELF_PAGESTART(load_bias
- vaddr
);
991 total_size
= total_mapping_size(elf_phdata
,
992 loc
->elf_ex
.e_phnum
);
995 goto out_free_dentry
;
999 error
= elf_map(bprm
->file
, load_bias
+ vaddr
, elf_ppnt
,
1000 elf_prot
, elf_flags
, total_size
);
1001 if (BAD_ADDR(error
)) {
1002 retval
= IS_ERR((void *)error
) ?
1003 PTR_ERR((void*)error
) : -EINVAL
;
1004 goto out_free_dentry
;
1007 if (!load_addr_set
) {
1009 load_addr
= (elf_ppnt
->p_vaddr
- elf_ppnt
->p_offset
);
1010 if (loc
->elf_ex
.e_type
== ET_DYN
) {
1011 load_bias
+= error
-
1012 ELF_PAGESTART(load_bias
+ vaddr
);
1013 load_addr
+= load_bias
;
1014 reloc_func_desc
= load_bias
;
1017 k
= elf_ppnt
->p_vaddr
;
1024 * Check to see if the section's size will overflow the
1025 * allowed task size. Note that p_filesz must always be
1026 * <= p_memsz so it is only necessary to check p_memsz.
1028 if (BAD_ADDR(k
) || elf_ppnt
->p_filesz
> elf_ppnt
->p_memsz
||
1029 elf_ppnt
->p_memsz
> TASK_SIZE
||
1030 TASK_SIZE
- elf_ppnt
->p_memsz
< k
) {
1031 /* set_brk can never work. Avoid overflows. */
1033 goto out_free_dentry
;
1036 k
= elf_ppnt
->p_vaddr
+ elf_ppnt
->p_filesz
;
1040 if ((elf_ppnt
->p_flags
& PF_X
) && end_code
< k
)
1044 k
= elf_ppnt
->p_vaddr
+ elf_ppnt
->p_memsz
;
1046 bss_prot
= elf_prot
;
1051 loc
->elf_ex
.e_entry
+= load_bias
;
1052 elf_bss
+= load_bias
;
1053 elf_brk
+= load_bias
;
1054 start_code
+= load_bias
;
1055 end_code
+= load_bias
;
1056 start_data
+= load_bias
;
1057 end_data
+= load_bias
;
1059 /* Calling set_brk effectively mmaps the pages that we need
1060 * for the bss and break sections. We must do this before
1061 * mapping in the interpreter, to make sure it doesn't wind
1062 * up getting placed where the bss needs to go.
1064 retval
= set_brk(elf_bss
, elf_brk
, bss_prot
);
1066 goto out_free_dentry
;
1067 if (likely(elf_bss
!= elf_brk
) && unlikely(padzero(elf_bss
))) {
1068 retval
= -EFAULT
; /* Nobody gets to see this, but.. */
1069 goto out_free_dentry
;
1072 if (elf_interpreter
) {
1073 unsigned long interp_map_addr
= 0;
1075 elf_entry
= load_elf_interp(&loc
->interp_elf_ex
,
1078 load_bias
, interp_elf_phdata
);
1079 if (!IS_ERR((void *)elf_entry
)) {
1081 * load_elf_interp() returns relocation
1084 interp_load_addr
= elf_entry
;
1085 elf_entry
+= loc
->interp_elf_ex
.e_entry
;
1087 if (BAD_ADDR(elf_entry
)) {
1088 retval
= IS_ERR((void *)elf_entry
) ?
1089 (int)elf_entry
: -EINVAL
;
1090 goto out_free_dentry
;
1092 reloc_func_desc
= interp_load_addr
;
1094 allow_write_access(interpreter
);
1096 kfree(elf_interpreter
);
1098 elf_entry
= loc
->elf_ex
.e_entry
;
1099 if (BAD_ADDR(elf_entry
)) {
1101 goto out_free_dentry
;
1105 kfree(interp_elf_phdata
);
1108 set_binfmt(&elf_format
);
1110 #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
1111 retval
= arch_setup_additional_pages(bprm
, !!elf_interpreter
);
1114 #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
1116 retval
= create_elf_tables(bprm
, &loc
->elf_ex
,
1117 load_addr
, interp_load_addr
);
1120 /* N.B. passed_fileno might not be initialized? */
1121 current
->mm
->end_code
= end_code
;
1122 current
->mm
->start_code
= start_code
;
1123 current
->mm
->start_data
= start_data
;
1124 current
->mm
->end_data
= end_data
;
1125 current
->mm
->start_stack
= bprm
->p
;
1127 if ((current
->flags
& PF_RANDOMIZE
) && (randomize_va_space
> 1)) {
1128 current
->mm
->brk
= current
->mm
->start_brk
=
1129 arch_randomize_brk(current
->mm
);
1130 #ifdef compat_brk_randomized
1131 current
->brk_randomized
= 1;
1135 if (current
->personality
& MMAP_PAGE_ZERO
) {
1136 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
1137 and some applications "depend" upon this behavior.
1138 Since we do not have the power to recompile these, we
1139 emulate the SVr4 behavior. Sigh. */
1140 error
= vm_mmap(NULL
, 0, PAGE_SIZE
, PROT_READ
| PROT_EXEC
,
1141 MAP_FIXED
| MAP_PRIVATE
, 0);
1144 #ifdef ELF_PLAT_INIT
1146 * The ABI may specify that certain registers be set up in special
1147 * ways (on i386 %edx is the address of a DT_FINI function, for
1148 * example. In addition, it may also specify (eg, PowerPC64 ELF)
1149 * that the e_entry field is the address of the function descriptor
1150 * for the startup routine, rather than the address of the startup
1151 * routine itself. This macro performs whatever initialization to
1152 * the regs structure is required as well as any relocations to the
1153 * function descriptor entries when executing dynamically links apps.
1155 ELF_PLAT_INIT(regs
, reloc_func_desc
);
1158 finalize_exec(bprm
);
1159 start_thread(regs
, elf_entry
, bprm
->p
);
1168 kfree(interp_elf_phdata
);
1169 allow_write_access(interpreter
);
1173 kfree(elf_interpreter
);
1179 #ifdef CONFIG_USELIB
1180 /* This is really simpleminded and specialized - we are loading an
1181 a.out library that is given an ELF header. */
1182 static int load_elf_library(struct file
*file
)
1184 struct elf_phdr
*elf_phdata
;
1185 struct elf_phdr
*eppnt
;
1186 unsigned long elf_bss
, bss
, len
;
1187 int retval
, error
, i
, j
;
1188 struct elfhdr elf_ex
;
1192 retval
= kernel_read(file
, &elf_ex
, sizeof(elf_ex
), &pos
);
1193 if (retval
!= sizeof(elf_ex
))
1196 if (memcmp(elf_ex
.e_ident
, ELFMAG
, SELFMAG
) != 0)
1199 /* First of all, some simple consistency checks */
1200 if (elf_ex
.e_type
!= ET_EXEC
|| elf_ex
.e_phnum
> 2 ||
1201 !elf_check_arch(&elf_ex
) || !file
->f_op
->mmap
)
1203 if (elf_check_fdpic(&elf_ex
))
1206 /* Now read in all of the header information */
1208 j
= sizeof(struct elf_phdr
) * elf_ex
.e_phnum
;
1209 /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */
1212 elf_phdata
= kmalloc(j
, GFP_KERNEL
);
1218 pos
= elf_ex
.e_phoff
;
1219 retval
= kernel_read(file
, eppnt
, j
, &pos
);
1223 for (j
= 0, i
= 0; i
<elf_ex
.e_phnum
; i
++)
1224 if ((eppnt
+ i
)->p_type
== PT_LOAD
)
1229 while (eppnt
->p_type
!= PT_LOAD
)
1232 /* Now use mmap to map the library into memory. */
1233 error
= vm_mmap(file
,
1234 ELF_PAGESTART(eppnt
->p_vaddr
),
1236 ELF_PAGEOFFSET(eppnt
->p_vaddr
)),
1237 PROT_READ
| PROT_WRITE
| PROT_EXEC
,
1238 MAP_FIXED
| MAP_PRIVATE
| MAP_DENYWRITE
,
1240 ELF_PAGEOFFSET(eppnt
->p_vaddr
)));
1241 if (error
!= ELF_PAGESTART(eppnt
->p_vaddr
))
1244 elf_bss
= eppnt
->p_vaddr
+ eppnt
->p_filesz
;
1245 if (padzero(elf_bss
)) {
1250 len
= ELF_PAGESTART(eppnt
->p_filesz
+ eppnt
->p_vaddr
+
1252 bss
= eppnt
->p_memsz
+ eppnt
->p_vaddr
;
1254 error
= vm_brk(len
, bss
- len
);
1265 #endif /* #ifdef CONFIG_USELIB */
1267 #ifdef CONFIG_ELF_CORE
1271 * Modelled on fs/exec.c:aout_core_dump()
1272 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1276 * The purpose of always_dump_vma() is to make sure that special kernel mappings
1277 * that are useful for post-mortem analysis are included in every core dump.
1278 * In that way we ensure that the core dump is fully interpretable later
1279 * without matching up the same kernel and hardware config to see what PC values
1280 * meant. These special mappings include - vDSO, vsyscall, and other
1281 * architecture specific mappings
1283 static bool always_dump_vma(struct vm_area_struct
*vma
)
1285 /* Any vsyscall mappings? */
1286 if (vma
== get_gate_vma(vma
->vm_mm
))
1290 * Assume that all vmas with a .name op should always be dumped.
1291 * If this changes, a new vm_ops field can easily be added.
1293 if (vma
->vm_ops
&& vma
->vm_ops
->name
&& vma
->vm_ops
->name(vma
))
1297 * arch_vma_name() returns non-NULL for special architecture mappings,
1298 * such as vDSO sections.
1300 if (arch_vma_name(vma
))
1307 * Decide what to dump of a segment, part, all or none.
1309 static unsigned long vma_dump_size(struct vm_area_struct
*vma
,
1310 unsigned long mm_flags
)
1312 #define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type))
1314 /* always dump the vdso and vsyscall sections */
1315 if (always_dump_vma(vma
))
1318 if (vma
->vm_flags
& VM_DONTDUMP
)
1321 /* support for DAX */
1322 if (vma_is_dax(vma
)) {
1323 if ((vma
->vm_flags
& VM_SHARED
) && FILTER(DAX_SHARED
))
1325 if (!(vma
->vm_flags
& VM_SHARED
) && FILTER(DAX_PRIVATE
))
1330 /* Hugetlb memory check */
1331 if (vma
->vm_flags
& VM_HUGETLB
) {
1332 if ((vma
->vm_flags
& VM_SHARED
) && FILTER(HUGETLB_SHARED
))
1334 if (!(vma
->vm_flags
& VM_SHARED
) && FILTER(HUGETLB_PRIVATE
))
1339 /* Do not dump I/O mapped devices or special mappings */
1340 if (vma
->vm_flags
& VM_IO
)
1343 /* By default, dump shared memory if mapped from an anonymous file. */
1344 if (vma
->vm_flags
& VM_SHARED
) {
1345 if (file_inode(vma
->vm_file
)->i_nlink
== 0 ?
1346 FILTER(ANON_SHARED
) : FILTER(MAPPED_SHARED
))
1351 /* Dump segments that have been written to. */
1352 if (vma
->anon_vma
&& FILTER(ANON_PRIVATE
))
1354 if (vma
->vm_file
== NULL
)
1357 if (FILTER(MAPPED_PRIVATE
))
1361 * If this looks like the beginning of a DSO or executable mapping,
1362 * check for an ELF header. If we find one, dump the first page to
1363 * aid in determining what was mapped here.
1365 if (FILTER(ELF_HEADERS
) &&
1366 vma
->vm_pgoff
== 0 && (vma
->vm_flags
& VM_READ
)) {
1367 u32 __user
*header
= (u32 __user
*) vma
->vm_start
;
1369 mm_segment_t fs
= get_fs();
1371 * Doing it this way gets the constant folded by GCC.
1375 char elfmag
[SELFMAG
];
1377 BUILD_BUG_ON(SELFMAG
!= sizeof word
);
1378 magic
.elfmag
[EI_MAG0
] = ELFMAG0
;
1379 magic
.elfmag
[EI_MAG1
] = ELFMAG1
;
1380 magic
.elfmag
[EI_MAG2
] = ELFMAG2
;
1381 magic
.elfmag
[EI_MAG3
] = ELFMAG3
;
1383 * Switch to the user "segment" for get_user(),
1384 * then put back what elf_core_dump() had in place.
1387 if (unlikely(get_user(word
, header
)))
1390 if (word
== magic
.cmp
)
1399 return vma
->vm_end
- vma
->vm_start
;
1402 /* An ELF note in memory */
1407 unsigned int datasz
;
1411 static int notesize(struct memelfnote
*en
)
1415 sz
= sizeof(struct elf_note
);
1416 sz
+= roundup(strlen(en
->name
) + 1, 4);
1417 sz
+= roundup(en
->datasz
, 4);
1422 static int writenote(struct memelfnote
*men
, struct coredump_params
*cprm
)
1425 en
.n_namesz
= strlen(men
->name
) + 1;
1426 en
.n_descsz
= men
->datasz
;
1427 en
.n_type
= men
->type
;
1429 return dump_emit(cprm
, &en
, sizeof(en
)) &&
1430 dump_emit(cprm
, men
->name
, en
.n_namesz
) && dump_align(cprm
, 4) &&
1431 dump_emit(cprm
, men
->data
, men
->datasz
) && dump_align(cprm
, 4);
1434 static void fill_elf_header(struct elfhdr
*elf
, int segs
,
1435 u16 machine
, u32 flags
)
1437 memset(elf
, 0, sizeof(*elf
));
1439 memcpy(elf
->e_ident
, ELFMAG
, SELFMAG
);
1440 elf
->e_ident
[EI_CLASS
] = ELF_CLASS
;
1441 elf
->e_ident
[EI_DATA
] = ELF_DATA
;
1442 elf
->e_ident
[EI_VERSION
] = EV_CURRENT
;
1443 elf
->e_ident
[EI_OSABI
] = ELF_OSABI
;
1445 elf
->e_type
= ET_CORE
;
1446 elf
->e_machine
= machine
;
1447 elf
->e_version
= EV_CURRENT
;
1448 elf
->e_phoff
= sizeof(struct elfhdr
);
1449 elf
->e_flags
= flags
;
1450 elf
->e_ehsize
= sizeof(struct elfhdr
);
1451 elf
->e_phentsize
= sizeof(struct elf_phdr
);
1452 elf
->e_phnum
= segs
;
1457 static void fill_elf_note_phdr(struct elf_phdr
*phdr
, int sz
, loff_t offset
)
1459 phdr
->p_type
= PT_NOTE
;
1460 phdr
->p_offset
= offset
;
1463 phdr
->p_filesz
= sz
;
1470 static void fill_note(struct memelfnote
*note
, const char *name
, int type
,
1471 unsigned int sz
, void *data
)
1481 * fill up all the fields in prstatus from the given task struct, except
1482 * registers which need to be filled up separately.
1484 static void fill_prstatus(struct elf_prstatus
*prstatus
,
1485 struct task_struct
*p
, long signr
)
1487 prstatus
->pr_info
.si_signo
= prstatus
->pr_cursig
= signr
;
1488 prstatus
->pr_sigpend
= p
->pending
.signal
.sig
[0];
1489 prstatus
->pr_sighold
= p
->blocked
.sig
[0];
1491 prstatus
->pr_ppid
= task_pid_vnr(rcu_dereference(p
->real_parent
));
1493 prstatus
->pr_pid
= task_pid_vnr(p
);
1494 prstatus
->pr_pgrp
= task_pgrp_vnr(p
);
1495 prstatus
->pr_sid
= task_session_vnr(p
);
1496 if (thread_group_leader(p
)) {
1497 struct task_cputime cputime
;
1500 * This is the record for the group leader. It shows the
1501 * group-wide total, not its individual thread total.
1503 thread_group_cputime(p
, &cputime
);
1504 prstatus
->pr_utime
= ns_to_timeval(cputime
.utime
);
1505 prstatus
->pr_stime
= ns_to_timeval(cputime
.stime
);
1509 task_cputime(p
, &utime
, &stime
);
1510 prstatus
->pr_utime
= ns_to_timeval(utime
);
1511 prstatus
->pr_stime
= ns_to_timeval(stime
);
1514 prstatus
->pr_cutime
= ns_to_timeval(p
->signal
->cutime
);
1515 prstatus
->pr_cstime
= ns_to_timeval(p
->signal
->cstime
);
1518 static int fill_psinfo(struct elf_prpsinfo
*psinfo
, struct task_struct
*p
,
1519 struct mm_struct
*mm
)
1521 const struct cred
*cred
;
1522 unsigned int i
, len
;
1524 /* first copy the parameters from user space */
1525 memset(psinfo
, 0, sizeof(struct elf_prpsinfo
));
1527 len
= mm
->arg_end
- mm
->arg_start
;
1528 if (len
>= ELF_PRARGSZ
)
1529 len
= ELF_PRARGSZ
-1;
1530 if (copy_from_user(&psinfo
->pr_psargs
,
1531 (const char __user
*)mm
->arg_start
, len
))
1533 for(i
= 0; i
< len
; i
++)
1534 if (psinfo
->pr_psargs
[i
] == 0)
1535 psinfo
->pr_psargs
[i
] = ' ';
1536 psinfo
->pr_psargs
[len
] = 0;
1539 psinfo
->pr_ppid
= task_pid_vnr(rcu_dereference(p
->real_parent
));
1541 psinfo
->pr_pid
= task_pid_vnr(p
);
1542 psinfo
->pr_pgrp
= task_pgrp_vnr(p
);
1543 psinfo
->pr_sid
= task_session_vnr(p
);
1545 i
= p
->state
? ffz(~p
->state
) + 1 : 0;
1546 psinfo
->pr_state
= i
;
1547 psinfo
->pr_sname
= (i
> 5) ? '.' : "RSDTZW"[i
];
1548 psinfo
->pr_zomb
= psinfo
->pr_sname
== 'Z';
1549 psinfo
->pr_nice
= task_nice(p
);
1550 psinfo
->pr_flag
= p
->flags
;
1552 cred
= __task_cred(p
);
1553 SET_UID(psinfo
->pr_uid
, from_kuid_munged(cred
->user_ns
, cred
->uid
));
1554 SET_GID(psinfo
->pr_gid
, from_kgid_munged(cred
->user_ns
, cred
->gid
));
1556 strncpy(psinfo
->pr_fname
, p
->comm
, sizeof(psinfo
->pr_fname
));
1561 static void fill_auxv_note(struct memelfnote
*note
, struct mm_struct
*mm
)
1563 elf_addr_t
*auxv
= (elf_addr_t
*) mm
->saved_auxv
;
1567 while (auxv
[i
- 2] != AT_NULL
);
1568 fill_note(note
, "CORE", NT_AUXV
, i
* sizeof(elf_addr_t
), auxv
);
1571 static void fill_siginfo_note(struct memelfnote
*note
, user_siginfo_t
*csigdata
,
1572 const siginfo_t
*siginfo
)
1574 mm_segment_t old_fs
= get_fs();
1576 copy_siginfo_to_user((user_siginfo_t __user
*) csigdata
, siginfo
);
1578 fill_note(note
, "CORE", NT_SIGINFO
, sizeof(*csigdata
), csigdata
);
1581 #define MAX_FILE_NOTE_SIZE (4*1024*1024)
1583 * Format of NT_FILE note:
1585 * long count -- how many files are mapped
1586 * long page_size -- units for file_ofs
1587 * array of [COUNT] elements of
1591 * followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL...
1593 static int fill_files_note(struct memelfnote
*note
)
1595 struct vm_area_struct
*vma
;
1596 unsigned count
, size
, names_ofs
, remaining
, n
;
1598 user_long_t
*start_end_ofs
;
1599 char *name_base
, *name_curpos
;
1601 /* *Estimated* file count and total data size needed */
1602 count
= current
->mm
->map_count
;
1603 if (count
> UINT_MAX
/ 64)
1607 names_ofs
= (2 + 3 * count
) * sizeof(data
[0]);
1609 if (size
>= MAX_FILE_NOTE_SIZE
) /* paranoia check */
1611 size
= round_up(size
, PAGE_SIZE
);
1612 data
= vmalloc(size
);
1616 start_end_ofs
= data
+ 2;
1617 name_base
= name_curpos
= ((char *)data
) + names_ofs
;
1618 remaining
= size
- names_ofs
;
1620 for (vma
= current
->mm
->mmap
; vma
!= NULL
; vma
= vma
->vm_next
) {
1622 const char *filename
;
1624 file
= vma
->vm_file
;
1627 filename
= file_path(file
, name_curpos
, remaining
);
1628 if (IS_ERR(filename
)) {
1629 if (PTR_ERR(filename
) == -ENAMETOOLONG
) {
1631 size
= size
* 5 / 4;
1637 /* file_path() fills at the end, move name down */
1638 /* n = strlen(filename) + 1: */
1639 n
= (name_curpos
+ remaining
) - filename
;
1640 remaining
= filename
- name_curpos
;
1641 memmove(name_curpos
, filename
, n
);
1644 *start_end_ofs
++ = vma
->vm_start
;
1645 *start_end_ofs
++ = vma
->vm_end
;
1646 *start_end_ofs
++ = vma
->vm_pgoff
;
1650 /* Now we know exact count of files, can store it */
1652 data
[1] = PAGE_SIZE
;
1654 * Count usually is less than current->mm->map_count,
1655 * we need to move filenames down.
1657 n
= current
->mm
->map_count
- count
;
1659 unsigned shift_bytes
= n
* 3 * sizeof(data
[0]);
1660 memmove(name_base
- shift_bytes
, name_base
,
1661 name_curpos
- name_base
);
1662 name_curpos
-= shift_bytes
;
1665 size
= name_curpos
- (char *)data
;
1666 fill_note(note
, "CORE", NT_FILE
, size
, data
);
1670 #ifdef CORE_DUMP_USE_REGSET
1671 #include <linux/regset.h>
1673 struct elf_thread_core_info
{
1674 struct elf_thread_core_info
*next
;
1675 struct task_struct
*task
;
1676 struct elf_prstatus prstatus
;
1677 struct memelfnote notes
[0];
1680 struct elf_note_info
{
1681 struct elf_thread_core_info
*thread
;
1682 struct memelfnote psinfo
;
1683 struct memelfnote signote
;
1684 struct memelfnote auxv
;
1685 struct memelfnote files
;
1686 user_siginfo_t csigdata
;
1692 * When a regset has a writeback hook, we call it on each thread before
1693 * dumping user memory. On register window machines, this makes sure the
1694 * user memory backing the register data is up to date before we read it.
1696 static void do_thread_regset_writeback(struct task_struct
*task
,
1697 const struct user_regset
*regset
)
1699 if (regset
->writeback
)
1700 regset
->writeback(task
, regset
, 1);
1703 #ifndef PRSTATUS_SIZE
1704 #define PRSTATUS_SIZE(S, R) sizeof(S)
1707 #ifndef SET_PR_FPVALID
1708 #define SET_PR_FPVALID(S, V, R) ((S)->pr_fpvalid = (V))
1711 static int fill_thread_core_info(struct elf_thread_core_info
*t
,
1712 const struct user_regset_view
*view
,
1713 long signr
, size_t *total
)
1716 unsigned int regset0_size
= regset_size(t
->task
, &view
->regsets
[0]);
1719 * NT_PRSTATUS is the one special case, because the regset data
1720 * goes into the pr_reg field inside the note contents, rather
1721 * than being the whole note contents. We fill the reset in here.
1722 * We assume that regset 0 is NT_PRSTATUS.
1724 fill_prstatus(&t
->prstatus
, t
->task
, signr
);
1725 (void) view
->regsets
[0].get(t
->task
, &view
->regsets
[0], 0, regset0_size
,
1726 &t
->prstatus
.pr_reg
, NULL
);
1728 fill_note(&t
->notes
[0], "CORE", NT_PRSTATUS
,
1729 PRSTATUS_SIZE(t
->prstatus
, regset0_size
), &t
->prstatus
);
1730 *total
+= notesize(&t
->notes
[0]);
1732 do_thread_regset_writeback(t
->task
, &view
->regsets
[0]);
1735 * Each other regset might generate a note too. For each regset
1736 * that has no core_note_type or is inactive, we leave t->notes[i]
1737 * all zero and we'll know to skip writing it later.
1739 for (i
= 1; i
< view
->n
; ++i
) {
1740 const struct user_regset
*regset
= &view
->regsets
[i
];
1741 do_thread_regset_writeback(t
->task
, regset
);
1742 if (regset
->core_note_type
&& regset
->get
&&
1743 (!regset
->active
|| regset
->active(t
->task
, regset
))) {
1745 size_t size
= regset_size(t
->task
, regset
);
1746 void *data
= kmalloc(size
, GFP_KERNEL
);
1747 if (unlikely(!data
))
1749 ret
= regset
->get(t
->task
, regset
,
1750 0, size
, data
, NULL
);
1754 if (regset
->core_note_type
!= NT_PRFPREG
)
1755 fill_note(&t
->notes
[i
], "LINUX",
1756 regset
->core_note_type
,
1759 SET_PR_FPVALID(&t
->prstatus
,
1761 fill_note(&t
->notes
[i
], "CORE",
1762 NT_PRFPREG
, size
, data
);
1764 *total
+= notesize(&t
->notes
[i
]);
1772 static int fill_note_info(struct elfhdr
*elf
, int phdrs
,
1773 struct elf_note_info
*info
,
1774 const siginfo_t
*siginfo
, struct pt_regs
*regs
)
1776 struct task_struct
*dump_task
= current
;
1777 const struct user_regset_view
*view
= task_user_regset_view(dump_task
);
1778 struct elf_thread_core_info
*t
;
1779 struct elf_prpsinfo
*psinfo
;
1780 struct core_thread
*ct
;
1784 info
->thread
= NULL
;
1786 psinfo
= kmalloc(sizeof(*psinfo
), GFP_KERNEL
);
1787 if (psinfo
== NULL
) {
1788 info
->psinfo
.data
= NULL
; /* So we don't free this wrongly */
1792 fill_note(&info
->psinfo
, "CORE", NT_PRPSINFO
, sizeof(*psinfo
), psinfo
);
1795 * Figure out how many notes we're going to need for each thread.
1797 info
->thread_notes
= 0;
1798 for (i
= 0; i
< view
->n
; ++i
)
1799 if (view
->regsets
[i
].core_note_type
!= 0)
1800 ++info
->thread_notes
;
1803 * Sanity check. We rely on regset 0 being in NT_PRSTATUS,
1804 * since it is our one special case.
1806 if (unlikely(info
->thread_notes
== 0) ||
1807 unlikely(view
->regsets
[0].core_note_type
!= NT_PRSTATUS
)) {
1813 * Initialize the ELF file header.
1815 fill_elf_header(elf
, phdrs
,
1816 view
->e_machine
, view
->e_flags
);
1819 * Allocate a structure for each thread.
1821 for (ct
= &dump_task
->mm
->core_state
->dumper
; ct
; ct
= ct
->next
) {
1822 t
= kzalloc(offsetof(struct elf_thread_core_info
,
1823 notes
[info
->thread_notes
]),
1829 if (ct
->task
== dump_task
|| !info
->thread
) {
1830 t
->next
= info
->thread
;
1834 * Make sure to keep the original task at
1835 * the head of the list.
1837 t
->next
= info
->thread
->next
;
1838 info
->thread
->next
= t
;
1843 * Now fill in each thread's information.
1845 for (t
= info
->thread
; t
!= NULL
; t
= t
->next
)
1846 if (!fill_thread_core_info(t
, view
, siginfo
->si_signo
, &info
->size
))
1850 * Fill in the two process-wide notes.
1852 fill_psinfo(psinfo
, dump_task
->group_leader
, dump_task
->mm
);
1853 info
->size
+= notesize(&info
->psinfo
);
1855 fill_siginfo_note(&info
->signote
, &info
->csigdata
, siginfo
);
1856 info
->size
+= notesize(&info
->signote
);
1858 fill_auxv_note(&info
->auxv
, current
->mm
);
1859 info
->size
+= notesize(&info
->auxv
);
1861 if (fill_files_note(&info
->files
) == 0)
1862 info
->size
+= notesize(&info
->files
);
1867 static size_t get_note_info_size(struct elf_note_info
*info
)
1873 * Write all the notes for each thread. When writing the first thread, the
1874 * process-wide notes are interleaved after the first thread-specific note.
1876 static int write_note_info(struct elf_note_info
*info
,
1877 struct coredump_params
*cprm
)
1880 struct elf_thread_core_info
*t
= info
->thread
;
1885 if (!writenote(&t
->notes
[0], cprm
))
1888 if (first
&& !writenote(&info
->psinfo
, cprm
))
1890 if (first
&& !writenote(&info
->signote
, cprm
))
1892 if (first
&& !writenote(&info
->auxv
, cprm
))
1894 if (first
&& info
->files
.data
&&
1895 !writenote(&info
->files
, cprm
))
1898 for (i
= 1; i
< info
->thread_notes
; ++i
)
1899 if (t
->notes
[i
].data
&&
1900 !writenote(&t
->notes
[i
], cprm
))
1910 static void free_note_info(struct elf_note_info
*info
)
1912 struct elf_thread_core_info
*threads
= info
->thread
;
1915 struct elf_thread_core_info
*t
= threads
;
1917 WARN_ON(t
->notes
[0].data
&& t
->notes
[0].data
!= &t
->prstatus
);
1918 for (i
= 1; i
< info
->thread_notes
; ++i
)
1919 kfree(t
->notes
[i
].data
);
1922 kfree(info
->psinfo
.data
);
1923 vfree(info
->files
.data
);
1928 /* Here is the structure in which status of each thread is captured. */
1929 struct elf_thread_status
1931 struct list_head list
;
1932 struct elf_prstatus prstatus
; /* NT_PRSTATUS */
1933 elf_fpregset_t fpu
; /* NT_PRFPREG */
1934 struct task_struct
*thread
;
1935 #ifdef ELF_CORE_COPY_XFPREGS
1936 elf_fpxregset_t xfpu
; /* ELF_CORE_XFPREG_TYPE */
1938 struct memelfnote notes
[3];
1943 * In order to add the specific thread information for the elf file format,
1944 * we need to keep a linked list of every threads pr_status and then create
1945 * a single section for them in the final core file.
1947 static int elf_dump_thread_status(long signr
, struct elf_thread_status
*t
)
1950 struct task_struct
*p
= t
->thread
;
1953 fill_prstatus(&t
->prstatus
, p
, signr
);
1954 elf_core_copy_task_regs(p
, &t
->prstatus
.pr_reg
);
1956 fill_note(&t
->notes
[0], "CORE", NT_PRSTATUS
, sizeof(t
->prstatus
),
1959 sz
+= notesize(&t
->notes
[0]);
1961 if ((t
->prstatus
.pr_fpvalid
= elf_core_copy_task_fpregs(p
, NULL
,
1963 fill_note(&t
->notes
[1], "CORE", NT_PRFPREG
, sizeof(t
->fpu
),
1966 sz
+= notesize(&t
->notes
[1]);
1969 #ifdef ELF_CORE_COPY_XFPREGS
1970 if (elf_core_copy_task_xfpregs(p
, &t
->xfpu
)) {
1971 fill_note(&t
->notes
[2], "LINUX", ELF_CORE_XFPREG_TYPE
,
1972 sizeof(t
->xfpu
), &t
->xfpu
);
1974 sz
+= notesize(&t
->notes
[2]);
1980 struct elf_note_info
{
1981 struct memelfnote
*notes
;
1982 struct memelfnote
*notes_files
;
1983 struct elf_prstatus
*prstatus
; /* NT_PRSTATUS */
1984 struct elf_prpsinfo
*psinfo
; /* NT_PRPSINFO */
1985 struct list_head thread_list
;
1986 elf_fpregset_t
*fpu
;
1987 #ifdef ELF_CORE_COPY_XFPREGS
1988 elf_fpxregset_t
*xfpu
;
1990 user_siginfo_t csigdata
;
1991 int thread_status_size
;
1995 static int elf_note_info_init(struct elf_note_info
*info
)
1997 memset(info
, 0, sizeof(*info
));
1998 INIT_LIST_HEAD(&info
->thread_list
);
2000 /* Allocate space for ELF notes */
2001 info
->notes
= kmalloc(8 * sizeof(struct memelfnote
), GFP_KERNEL
);
2004 info
->psinfo
= kmalloc(sizeof(*info
->psinfo
), GFP_KERNEL
);
2007 info
->prstatus
= kmalloc(sizeof(*info
->prstatus
), GFP_KERNEL
);
2008 if (!info
->prstatus
)
2010 info
->fpu
= kmalloc(sizeof(*info
->fpu
), GFP_KERNEL
);
2013 #ifdef ELF_CORE_COPY_XFPREGS
2014 info
->xfpu
= kmalloc(sizeof(*info
->xfpu
), GFP_KERNEL
);
2021 static int fill_note_info(struct elfhdr
*elf
, int phdrs
,
2022 struct elf_note_info
*info
,
2023 const siginfo_t
*siginfo
, struct pt_regs
*regs
)
2025 struct list_head
*t
;
2026 struct core_thread
*ct
;
2027 struct elf_thread_status
*ets
;
2029 if (!elf_note_info_init(info
))
2032 for (ct
= current
->mm
->core_state
->dumper
.next
;
2033 ct
; ct
= ct
->next
) {
2034 ets
= kzalloc(sizeof(*ets
), GFP_KERNEL
);
2038 ets
->thread
= ct
->task
;
2039 list_add(&ets
->list
, &info
->thread_list
);
2042 list_for_each(t
, &info
->thread_list
) {
2045 ets
= list_entry(t
, struct elf_thread_status
, list
);
2046 sz
= elf_dump_thread_status(siginfo
->si_signo
, ets
);
2047 info
->thread_status_size
+= sz
;
2049 /* now collect the dump for the current */
2050 memset(info
->prstatus
, 0, sizeof(*info
->prstatus
));
2051 fill_prstatus(info
->prstatus
, current
, siginfo
->si_signo
);
2052 elf_core_copy_regs(&info
->prstatus
->pr_reg
, regs
);
2055 fill_elf_header(elf
, phdrs
, ELF_ARCH
, ELF_CORE_EFLAGS
);
2058 * Set up the notes in similar form to SVR4 core dumps made
2059 * with info from their /proc.
2062 fill_note(info
->notes
+ 0, "CORE", NT_PRSTATUS
,
2063 sizeof(*info
->prstatus
), info
->prstatus
);
2064 fill_psinfo(info
->psinfo
, current
->group_leader
, current
->mm
);
2065 fill_note(info
->notes
+ 1, "CORE", NT_PRPSINFO
,
2066 sizeof(*info
->psinfo
), info
->psinfo
);
2068 fill_siginfo_note(info
->notes
+ 2, &info
->csigdata
, siginfo
);
2069 fill_auxv_note(info
->notes
+ 3, current
->mm
);
2072 if (fill_files_note(info
->notes
+ info
->numnote
) == 0) {
2073 info
->notes_files
= info
->notes
+ info
->numnote
;
2077 /* Try to dump the FPU. */
2078 info
->prstatus
->pr_fpvalid
= elf_core_copy_task_fpregs(current
, regs
,
2080 if (info
->prstatus
->pr_fpvalid
)
2081 fill_note(info
->notes
+ info
->numnote
++,
2082 "CORE", NT_PRFPREG
, sizeof(*info
->fpu
), info
->fpu
);
2083 #ifdef ELF_CORE_COPY_XFPREGS
2084 if (elf_core_copy_task_xfpregs(current
, info
->xfpu
))
2085 fill_note(info
->notes
+ info
->numnote
++,
2086 "LINUX", ELF_CORE_XFPREG_TYPE
,
2087 sizeof(*info
->xfpu
), info
->xfpu
);
2093 static size_t get_note_info_size(struct elf_note_info
*info
)
2098 for (i
= 0; i
< info
->numnote
; i
++)
2099 sz
+= notesize(info
->notes
+ i
);
2101 sz
+= info
->thread_status_size
;
2106 static int write_note_info(struct elf_note_info
*info
,
2107 struct coredump_params
*cprm
)
2110 struct list_head
*t
;
2112 for (i
= 0; i
< info
->numnote
; i
++)
2113 if (!writenote(info
->notes
+ i
, cprm
))
2116 /* write out the thread status notes section */
2117 list_for_each(t
, &info
->thread_list
) {
2118 struct elf_thread_status
*tmp
=
2119 list_entry(t
, struct elf_thread_status
, list
);
2121 for (i
= 0; i
< tmp
->num_notes
; i
++)
2122 if (!writenote(&tmp
->notes
[i
], cprm
))
2129 static void free_note_info(struct elf_note_info
*info
)
2131 while (!list_empty(&info
->thread_list
)) {
2132 struct list_head
*tmp
= info
->thread_list
.next
;
2134 kfree(list_entry(tmp
, struct elf_thread_status
, list
));
2137 /* Free data possibly allocated by fill_files_note(): */
2138 if (info
->notes_files
)
2139 vfree(info
->notes_files
->data
);
2141 kfree(info
->prstatus
);
2142 kfree(info
->psinfo
);
2145 #ifdef ELF_CORE_COPY_XFPREGS
2152 static struct vm_area_struct
*first_vma(struct task_struct
*tsk
,
2153 struct vm_area_struct
*gate_vma
)
2155 struct vm_area_struct
*ret
= tsk
->mm
->mmap
;
2162 * Helper function for iterating across a vma list. It ensures that the caller
2163 * will visit `gate_vma' prior to terminating the search.
2165 static struct vm_area_struct
*next_vma(struct vm_area_struct
*this_vma
,
2166 struct vm_area_struct
*gate_vma
)
2168 struct vm_area_struct
*ret
;
2170 ret
= this_vma
->vm_next
;
2173 if (this_vma
== gate_vma
)
2178 static void fill_extnum_info(struct elfhdr
*elf
, struct elf_shdr
*shdr4extnum
,
2179 elf_addr_t e_shoff
, int segs
)
2181 elf
->e_shoff
= e_shoff
;
2182 elf
->e_shentsize
= sizeof(*shdr4extnum
);
2184 elf
->e_shstrndx
= SHN_UNDEF
;
2186 memset(shdr4extnum
, 0, sizeof(*shdr4extnum
));
2188 shdr4extnum
->sh_type
= SHT_NULL
;
2189 shdr4extnum
->sh_size
= elf
->e_shnum
;
2190 shdr4extnum
->sh_link
= elf
->e_shstrndx
;
2191 shdr4extnum
->sh_info
= segs
;
2197 * This is a two-pass process; first we find the offsets of the bits,
2198 * and then they are actually written out. If we run out of core limit
2201 static int elf_core_dump(struct coredump_params
*cprm
)
2206 size_t vma_data_size
= 0;
2207 struct vm_area_struct
*vma
, *gate_vma
;
2208 struct elfhdr
*elf
= NULL
;
2209 loff_t offset
= 0, dataoff
;
2210 struct elf_note_info info
= { };
2211 struct elf_phdr
*phdr4note
= NULL
;
2212 struct elf_shdr
*shdr4extnum
= NULL
;
2215 elf_addr_t
*vma_filesz
= NULL
;
2218 * We no longer stop all VM operations.
2220 * This is because those proceses that could possibly change map_count
2221 * or the mmap / vma pages are now blocked in do_exit on current
2222 * finishing this core dump.
2224 * Only ptrace can touch these memory addresses, but it doesn't change
2225 * the map_count or the pages allocated. So no possibility of crashing
2226 * exists while dumping the mm->vm_next areas to the core file.
2229 /* alloc memory for large data structures: too large to be on stack */
2230 elf
= kmalloc(sizeof(*elf
), GFP_KERNEL
);
2234 * The number of segs are recored into ELF header as 16bit value.
2235 * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here.
2237 segs
= current
->mm
->map_count
;
2238 segs
+= elf_core_extra_phdrs();
2240 gate_vma
= get_gate_vma(current
->mm
);
2241 if (gate_vma
!= NULL
)
2244 /* for notes section */
2247 /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
2248 * this, kernel supports extended numbering. Have a look at
2249 * include/linux/elf.h for further information. */
2250 e_phnum
= segs
> PN_XNUM
? PN_XNUM
: segs
;
2253 * Collect all the non-memory information about the process for the
2254 * notes. This also sets up the file header.
2256 if (!fill_note_info(elf
, e_phnum
, &info
, cprm
->siginfo
, cprm
->regs
))
2264 offset
+= sizeof(*elf
); /* Elf header */
2265 offset
+= segs
* sizeof(struct elf_phdr
); /* Program headers */
2267 /* Write notes phdr entry */
2269 size_t sz
= get_note_info_size(&info
);
2271 sz
+= elf_coredump_extra_notes_size();
2273 phdr4note
= kmalloc(sizeof(*phdr4note
), GFP_KERNEL
);
2277 fill_elf_note_phdr(phdr4note
, sz
, offset
);
2281 dataoff
= offset
= roundup(offset
, ELF_EXEC_PAGESIZE
);
2283 if (segs
- 1 > ULONG_MAX
/ sizeof(*vma_filesz
))
2285 vma_filesz
= vmalloc((segs
- 1) * sizeof(*vma_filesz
));
2289 for (i
= 0, vma
= first_vma(current
, gate_vma
); vma
!= NULL
;
2290 vma
= next_vma(vma
, gate_vma
)) {
2291 unsigned long dump_size
;
2293 dump_size
= vma_dump_size(vma
, cprm
->mm_flags
);
2294 vma_filesz
[i
++] = dump_size
;
2295 vma_data_size
+= dump_size
;
2298 offset
+= vma_data_size
;
2299 offset
+= elf_core_extra_data_size();
2302 if (e_phnum
== PN_XNUM
) {
2303 shdr4extnum
= kmalloc(sizeof(*shdr4extnum
), GFP_KERNEL
);
2306 fill_extnum_info(elf
, shdr4extnum
, e_shoff
, segs
);
2311 if (!dump_emit(cprm
, elf
, sizeof(*elf
)))
2314 if (!dump_emit(cprm
, phdr4note
, sizeof(*phdr4note
)))
2317 /* Write program headers for segments dump */
2318 for (i
= 0, vma
= first_vma(current
, gate_vma
); vma
!= NULL
;
2319 vma
= next_vma(vma
, gate_vma
)) {
2320 struct elf_phdr phdr
;
2322 phdr
.p_type
= PT_LOAD
;
2323 phdr
.p_offset
= offset
;
2324 phdr
.p_vaddr
= vma
->vm_start
;
2326 phdr
.p_filesz
= vma_filesz
[i
++];
2327 phdr
.p_memsz
= vma
->vm_end
- vma
->vm_start
;
2328 offset
+= phdr
.p_filesz
;
2329 phdr
.p_flags
= vma
->vm_flags
& VM_READ
? PF_R
: 0;
2330 if (vma
->vm_flags
& VM_WRITE
)
2331 phdr
.p_flags
|= PF_W
;
2332 if (vma
->vm_flags
& VM_EXEC
)
2333 phdr
.p_flags
|= PF_X
;
2334 phdr
.p_align
= ELF_EXEC_PAGESIZE
;
2336 if (!dump_emit(cprm
, &phdr
, sizeof(phdr
)))
2340 if (!elf_core_write_extra_phdrs(cprm
, offset
))
2343 /* write out the notes section */
2344 if (!write_note_info(&info
, cprm
))
2347 if (elf_coredump_extra_notes_write(cprm
))
2351 if (!dump_skip(cprm
, dataoff
- cprm
->pos
))
2354 for (i
= 0, vma
= first_vma(current
, gate_vma
); vma
!= NULL
;
2355 vma
= next_vma(vma
, gate_vma
)) {
2359 end
= vma
->vm_start
+ vma_filesz
[i
++];
2361 for (addr
= vma
->vm_start
; addr
< end
; addr
+= PAGE_SIZE
) {
2365 page
= get_dump_page(addr
);
2367 void *kaddr
= kmap(page
);
2368 stop
= !dump_emit(cprm
, kaddr
, PAGE_SIZE
);
2372 stop
= !dump_skip(cprm
, PAGE_SIZE
);
2377 dump_truncate(cprm
);
2379 if (!elf_core_write_extra_data(cprm
))
2382 if (e_phnum
== PN_XNUM
) {
2383 if (!dump_emit(cprm
, shdr4extnum
, sizeof(*shdr4extnum
)))
2391 free_note_info(&info
);
2400 #endif /* CONFIG_ELF_CORE */
2402 static int __init
init_elf_binfmt(void)
2404 register_binfmt(&elf_format
);
2408 static void __exit
exit_elf_binfmt(void)
2410 /* Remove the COFF and ELF loaders. */
2411 unregister_binfmt(&elf_format
);
2414 core_initcall(init_elf_binfmt
);
2415 module_exit(exit_elf_binfmt
);
2416 MODULE_LICENSE("GPL");