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>
15 #include <linux/stat.h>
16 #include <linux/time.h>
18 #include <linux/mman.h>
19 #include <linux/a.out.h>
20 #include <linux/errno.h>
21 #include <linux/signal.h>
22 #include <linux/binfmts.h>
23 #include <linux/string.h>
24 #include <linux/file.h>
25 #include <linux/fcntl.h>
26 #include <linux/ptrace.h>
27 #include <linux/slab.h>
28 #include <linux/shm.h>
29 #include <linux/personality.h>
30 #include <linux/elfcore.h>
31 #include <linux/init.h>
32 #include <linux/highuid.h>
33 #include <linux/smp.h>
34 #include <linux/smp_lock.h>
35 #include <linux/compiler.h>
36 #include <linux/highmem.h>
37 #include <linux/pagemap.h>
38 #include <linux/security.h>
39 #include <linux/syscalls.h>
40 #include <linux/random.h>
41 #include <linux/elf.h>
42 #include <asm/uaccess.h>
43 #include <asm/param.h>
46 static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs);
47 static int load_elf_library(struct file *);
48 static unsigned long elf_map (struct file *, unsigned long, struct elf_phdr *, int, int);
51 * If we don't support core dumping, then supply a NULL so we
54 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
55 static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file);
57 #define elf_core_dump NULL
60 #if ELF_EXEC_PAGESIZE > PAGE_SIZE
61 #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE
63 #define ELF_MIN_ALIGN PAGE_SIZE
66 #ifndef ELF_CORE_EFLAGS
67 #define ELF_CORE_EFLAGS 0
70 #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
71 #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
72 #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
74 static struct linux_binfmt elf_format = {
75 .module = THIS_MODULE,
76 .load_binary = load_elf_binary,
77 .load_shlib = load_elf_library,
78 .core_dump = elf_core_dump,
79 .min_coredump = ELF_EXEC_PAGESIZE
82 #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
84 static int set_brk(unsigned long start, unsigned long end)
86 start = ELF_PAGEALIGN(start);
87 end = ELF_PAGEALIGN(end);
90 down_write(¤t->mm->mmap_sem);
91 addr = do_brk(start, end - start);
92 up_write(¤t->mm->mmap_sem);
96 current->mm->start_brk = current->mm->brk = end;
100 /* We need to explicitly zero any fractional pages
101 after the data section (i.e. bss). This would
102 contain the junk from the file that should not
105 static int padzero(unsigned long elf_bss)
109 nbyte = ELF_PAGEOFFSET(elf_bss);
111 nbyte = ELF_MIN_ALIGN - nbyte;
112 if (clear_user((void __user *) elf_bss, nbyte))
118 /* Let's use some macros to make this stack manipulation a litle clearer */
119 #ifdef CONFIG_STACK_GROWSUP
120 #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
121 #define STACK_ROUND(sp, items) \
122 ((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
123 #define STACK_ALLOC(sp, len) ({ \
124 elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \
127 #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
128 #define STACK_ROUND(sp, items) \
129 (((unsigned long) (sp - items)) &~ 15UL)
130 #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
134 create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
135 int interp_aout, unsigned long load_addr,
136 unsigned long interp_load_addr)
138 unsigned long p = bprm->p;
139 int argc = bprm->argc;
140 int envc = bprm->envc;
141 elf_addr_t __user *argv;
142 elf_addr_t __user *envp;
143 elf_addr_t __user *sp;
144 elf_addr_t __user *u_platform;
145 const char *k_platform = ELF_PLATFORM;
147 elf_addr_t *elf_info;
149 struct task_struct *tsk = current;
152 * If this architecture has a platform capability string, copy it
153 * to userspace. In some cases (Sparc), this info is impossible
154 * for userspace to get any other way, in others (i386) it is
159 size_t len = strlen(k_platform) + 1;
162 * In some cases (e.g. Hyper-Threading), we want to avoid L1
163 * evictions by the processes running on the same package. One
164 * thing we can do is to shuffle the initial stack for them.
167 p = arch_align_stack(p);
169 u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
170 if (__copy_to_user(u_platform, k_platform, len))
174 /* Create the ELF interpreter info */
175 elf_info = (elf_addr_t *)current->mm->saved_auxv;
176 #define NEW_AUX_ENT(id, val) \
178 elf_info[ei_index++] = id; \
179 elf_info[ei_index++] = val; \
184 * ARCH_DLINFO must come first so PPC can do its special alignment of
189 NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
190 NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE);
191 NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
192 NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff);
193 NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
194 NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
195 NEW_AUX_ENT(AT_BASE, interp_load_addr);
196 NEW_AUX_ENT(AT_FLAGS, 0);
197 NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
198 NEW_AUX_ENT(AT_UID, tsk->uid);
199 NEW_AUX_ENT(AT_EUID, tsk->euid);
200 NEW_AUX_ENT(AT_GID, tsk->gid);
201 NEW_AUX_ENT(AT_EGID, tsk->egid);
202 NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
204 NEW_AUX_ENT(AT_PLATFORM,
205 (elf_addr_t)(unsigned long)u_platform);
207 if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
208 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
211 /* AT_NULL is zero; clear the rest too */
212 memset(&elf_info[ei_index], 0,
213 sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]);
215 /* And advance past the AT_NULL entry. */
218 sp = STACK_ADD(p, ei_index);
220 items = (argc + 1) + (envc + 1);
222 items += 3; /* a.out interpreters require argv & envp too */
224 items += 1; /* ELF interpreters only put argc on the stack */
226 bprm->p = STACK_ROUND(sp, items);
228 /* Point sp at the lowest address on the stack */
229 #ifdef CONFIG_STACK_GROWSUP
230 sp = (elf_addr_t __user *)bprm->p - items - ei_index;
231 bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */
233 sp = (elf_addr_t __user *)bprm->p;
236 /* Now, let's put argc (and argv, envp if appropriate) on the stack */
237 if (__put_user(argc, sp++))
241 envp = argv + argc + 1;
242 if (__put_user((elf_addr_t)(unsigned long)argv, sp++) ||
243 __put_user((elf_addr_t)(unsigned long)envp, sp++))
247 envp = argv + argc + 1;
250 /* Populate argv and envp */
251 p = current->mm->arg_end = current->mm->arg_start;
254 if (__put_user((elf_addr_t)p, argv++))
256 len = strnlen_user((void __user *)p, PAGE_SIZE*MAX_ARG_PAGES);
257 if (!len || len > PAGE_SIZE*MAX_ARG_PAGES)
261 if (__put_user(0, argv))
263 current->mm->arg_end = current->mm->env_start = p;
266 if (__put_user((elf_addr_t)p, envp++))
268 len = strnlen_user((void __user *)p, PAGE_SIZE*MAX_ARG_PAGES);
269 if (!len || len > PAGE_SIZE*MAX_ARG_PAGES)
273 if (__put_user(0, envp))
275 current->mm->env_end = p;
277 /* Put the elf_info on the stack in the right place. */
278 sp = (elf_addr_t __user *)envp + 1;
279 if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t)))
286 static unsigned long elf_map(struct file *filep, unsigned long addr,
287 struct elf_phdr *eppnt, int prot, int type)
289 unsigned long map_addr;
290 unsigned long pageoffset = ELF_PAGEOFFSET(eppnt->p_vaddr);
292 down_write(¤t->mm->mmap_sem);
293 /* mmap() will return -EINVAL if given a zero size, but a
294 * segment with zero filesize is perfectly valid */
295 if (eppnt->p_filesz + pageoffset)
296 map_addr = do_mmap(filep, ELF_PAGESTART(addr),
297 eppnt->p_filesz + pageoffset, prot, type,
298 eppnt->p_offset - pageoffset);
300 map_addr = ELF_PAGESTART(addr);
301 up_write(¤t->mm->mmap_sem);
305 #endif /* !elf_map */
307 /* This is much more generalized than the library routine read function,
308 so we keep this separate. Technically the library read function
309 is only provided so that we can read a.out libraries that have
312 static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
313 struct file *interpreter, unsigned long *interp_load_addr)
315 struct elf_phdr *elf_phdata;
316 struct elf_phdr *eppnt;
317 unsigned long load_addr = 0;
318 int load_addr_set = 0;
319 unsigned long last_bss = 0, elf_bss = 0;
320 unsigned long error = ~0UL;
323 /* First of all, some simple consistency checks */
324 if (interp_elf_ex->e_type != ET_EXEC &&
325 interp_elf_ex->e_type != ET_DYN)
327 if (!elf_check_arch(interp_elf_ex))
329 if (!interpreter->f_op || !interpreter->f_op->mmap)
333 * If the size of this structure has changed, then punt, since
334 * we will be doing the wrong thing.
336 if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr))
338 if (interp_elf_ex->e_phnum < 1 ||
339 interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr))
342 /* Now read in all of the header information */
343 size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum;
344 if (size > ELF_MIN_ALIGN)
346 elf_phdata = kmalloc(size, GFP_KERNEL);
350 retval = kernel_read(interpreter, interp_elf_ex->e_phoff,
351 (char *)elf_phdata,size);
353 if (retval != size) {
360 for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
361 if (eppnt->p_type == PT_LOAD) {
362 int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
364 unsigned long vaddr = 0;
365 unsigned long k, map_addr;
367 if (eppnt->p_flags & PF_R)
368 elf_prot = PROT_READ;
369 if (eppnt->p_flags & PF_W)
370 elf_prot |= PROT_WRITE;
371 if (eppnt->p_flags & PF_X)
372 elf_prot |= PROT_EXEC;
373 vaddr = eppnt->p_vaddr;
374 if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
375 elf_type |= MAP_FIXED;
377 map_addr = elf_map(interpreter, load_addr + vaddr,
378 eppnt, elf_prot, elf_type);
380 if (BAD_ADDR(map_addr))
383 if (!load_addr_set &&
384 interp_elf_ex->e_type == ET_DYN) {
385 load_addr = map_addr - ELF_PAGESTART(vaddr);
390 * Check to see if the section's size will overflow the
391 * allowed task size. Note that p_filesz must always be
392 * <= p_memsize so it's only necessary to check p_memsz.
394 k = load_addr + eppnt->p_vaddr;
396 eppnt->p_filesz > eppnt->p_memsz ||
397 eppnt->p_memsz > TASK_SIZE ||
398 TASK_SIZE - eppnt->p_memsz < k) {
404 * Find the end of the file mapping for this phdr, and
405 * keep track of the largest address we see for this.
407 k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
412 * Do the same thing for the memory mapping - between
413 * elf_bss and last_bss is the bss section.
415 k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
422 * Now fill out the bss section. First pad the last page up
423 * to the page boundary, and then perform a mmap to make sure
424 * that there are zero-mapped pages up to and including the
427 if (padzero(elf_bss)) {
432 /* What we have mapped so far */
433 elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1);
435 /* Map the last of the bss segment */
436 if (last_bss > elf_bss) {
437 down_write(¤t->mm->mmap_sem);
438 error = do_brk(elf_bss, last_bss - elf_bss);
439 up_write(¤t->mm->mmap_sem);
444 *interp_load_addr = load_addr;
445 error = ((unsigned long)interp_elf_ex->e_entry) + load_addr;
453 static unsigned long load_aout_interp(struct exec *interp_ex,
454 struct file *interpreter)
456 unsigned long text_data, elf_entry = ~0UL;
460 current->mm->end_code = interp_ex->a_text;
461 text_data = interp_ex->a_text + interp_ex->a_data;
462 current->mm->end_data = text_data;
463 current->mm->brk = interp_ex->a_bss + text_data;
465 switch (N_MAGIC(*interp_ex)) {
468 addr = (char __user *)0;
472 offset = N_TXTOFF(*interp_ex);
473 addr = (char __user *)N_TXTADDR(*interp_ex);
479 down_write(¤t->mm->mmap_sem);
480 do_brk(0, text_data);
481 up_write(¤t->mm->mmap_sem);
482 if (!interpreter->f_op || !interpreter->f_op->read)
484 if (interpreter->f_op->read(interpreter, addr, text_data, &offset) < 0)
486 flush_icache_range((unsigned long)addr,
487 (unsigned long)addr + text_data);
489 down_write(¤t->mm->mmap_sem);
490 do_brk(ELF_PAGESTART(text_data + ELF_MIN_ALIGN - 1),
492 up_write(¤t->mm->mmap_sem);
493 elf_entry = interp_ex->a_entry;
500 * These are the functions used to load ELF style executables and shared
501 * libraries. There is no binary dependent code anywhere else.
504 #define INTERPRETER_NONE 0
505 #define INTERPRETER_AOUT 1
506 #define INTERPRETER_ELF 2
508 #ifndef STACK_RND_MASK
509 #define STACK_RND_MASK 0x7ff /* with 4K pages 8MB of VA */
512 static unsigned long randomize_stack_top(unsigned long stack_top)
514 unsigned int random_variable = 0;
516 if ((current->flags & PF_RANDOMIZE) &&
517 !(current->personality & ADDR_NO_RANDOMIZE)) {
518 random_variable = get_random_int() & STACK_RND_MASK;
519 random_variable <<= PAGE_SHIFT;
521 #ifdef CONFIG_STACK_GROWSUP
522 return PAGE_ALIGN(stack_top) + random_variable;
524 return PAGE_ALIGN(stack_top) - random_variable;
528 static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs)
530 struct file *interpreter = NULL; /* to shut gcc up */
531 unsigned long load_addr = 0, load_bias = 0;
532 int load_addr_set = 0;
533 char * elf_interpreter = NULL;
534 unsigned int interpreter_type = INTERPRETER_NONE;
535 unsigned char ibcs2_interpreter = 0;
537 struct elf_phdr *elf_ppnt, *elf_phdata;
538 unsigned long elf_bss, elf_brk;
542 unsigned long elf_entry, interp_load_addr = 0;
543 unsigned long start_code, end_code, start_data, end_data;
544 unsigned long reloc_func_desc = 0;
545 char passed_fileno[6];
546 struct files_struct *files;
547 int have_pt_gnu_stack, executable_stack = EXSTACK_DEFAULT;
548 unsigned long def_flags = 0;
550 struct elfhdr elf_ex;
551 struct elfhdr interp_elf_ex;
552 struct exec interp_ex;
555 loc = kmalloc(sizeof(*loc), GFP_KERNEL);
561 /* Get the exec-header */
562 loc->elf_ex = *((struct elfhdr *)bprm->buf);
565 /* First of all, some simple consistency checks */
566 if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
569 if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN)
571 if (!elf_check_arch(&loc->elf_ex))
573 if (!bprm->file->f_op||!bprm->file->f_op->mmap)
576 /* Now read in all of the header information */
577 if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr))
579 if (loc->elf_ex.e_phnum < 1 ||
580 loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr))
582 size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr);
584 elf_phdata = kmalloc(size, GFP_KERNEL);
588 retval = kernel_read(bprm->file, loc->elf_ex.e_phoff,
589 (char *)elf_phdata, size);
590 if (retval != size) {
596 files = current->files; /* Refcounted so ok */
597 retval = unshare_files();
600 if (files == current->files) {
601 put_files_struct(files);
605 /* exec will make our files private anyway, but for the a.out
606 loader stuff we need to do it earlier */
607 retval = get_unused_fd();
610 get_file(bprm->file);
611 fd_install(elf_exec_fileno = retval, bprm->file);
613 elf_ppnt = elf_phdata;
622 for (i = 0; i < loc->elf_ex.e_phnum; i++) {
623 if (elf_ppnt->p_type == PT_INTERP) {
624 /* This is the program interpreter used for
625 * shared libraries - for now assume that this
626 * is an a.out format binary
629 if (elf_ppnt->p_filesz > PATH_MAX ||
630 elf_ppnt->p_filesz < 2)
634 elf_interpreter = kmalloc(elf_ppnt->p_filesz,
636 if (!elf_interpreter)
639 retval = kernel_read(bprm->file, elf_ppnt->p_offset,
642 if (retval != elf_ppnt->p_filesz) {
645 goto out_free_interp;
647 /* make sure path is NULL terminated */
649 if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
650 goto out_free_interp;
652 /* If the program interpreter is one of these two,
653 * then assume an iBCS2 image. Otherwise assume
654 * a native linux image.
656 if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
657 strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0)
658 ibcs2_interpreter = 1;
661 * The early SET_PERSONALITY here is so that the lookup
662 * for the interpreter happens in the namespace of the
663 * to-be-execed image. SET_PERSONALITY can select an
666 * However, SET_PERSONALITY is NOT allowed to switch
667 * this task into the new images's memory mapping
668 * policy - that is, TASK_SIZE must still evaluate to
669 * that which is appropriate to the execing application.
670 * This is because exit_mmap() needs to have TASK_SIZE
671 * evaluate to the size of the old image.
673 * So if (say) a 64-bit application is execing a 32-bit
674 * application it is the architecture's responsibility
675 * to defer changing the value of TASK_SIZE until the
676 * switch really is going to happen - do this in
677 * flush_thread(). - akpm
679 SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
681 interpreter = open_exec(elf_interpreter);
682 retval = PTR_ERR(interpreter);
683 if (IS_ERR(interpreter))
684 goto out_free_interp;
685 retval = kernel_read(interpreter, 0, bprm->buf,
687 if (retval != BINPRM_BUF_SIZE) {
690 goto out_free_dentry;
693 /* Get the exec headers */
694 loc->interp_ex = *((struct exec *)bprm->buf);
695 loc->interp_elf_ex = *((struct elfhdr *)bprm->buf);
701 elf_ppnt = elf_phdata;
702 for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++)
703 if (elf_ppnt->p_type == PT_GNU_STACK) {
704 if (elf_ppnt->p_flags & PF_X)
705 executable_stack = EXSTACK_ENABLE_X;
707 executable_stack = EXSTACK_DISABLE_X;
710 have_pt_gnu_stack = (i < loc->elf_ex.e_phnum);
712 /* Some simple consistency checks for the interpreter */
713 if (elf_interpreter) {
714 interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
716 /* Now figure out which format our binary is */
717 if ((N_MAGIC(loc->interp_ex) != OMAGIC) &&
718 (N_MAGIC(loc->interp_ex) != ZMAGIC) &&
719 (N_MAGIC(loc->interp_ex) != QMAGIC))
720 interpreter_type = INTERPRETER_ELF;
722 if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
723 interpreter_type &= ~INTERPRETER_ELF;
726 if (!interpreter_type)
727 goto out_free_dentry;
729 /* Make sure only one type was selected */
730 if ((interpreter_type & INTERPRETER_ELF) &&
731 interpreter_type != INTERPRETER_ELF) {
732 // FIXME - ratelimit this before re-enabling
733 // printk(KERN_WARNING "ELF: Ambiguous type, using ELF\n");
734 interpreter_type = INTERPRETER_ELF;
736 /* Verify the interpreter has a valid arch */
737 if ((interpreter_type == INTERPRETER_ELF) &&
738 !elf_check_arch(&loc->interp_elf_ex))
739 goto out_free_dentry;
741 /* Executables without an interpreter also need a personality */
742 SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
745 /* OK, we are done with that, now set up the arg stuff,
746 and then start this sucker up */
747 if ((!bprm->sh_bang) && (interpreter_type == INTERPRETER_AOUT)) {
748 char *passed_p = passed_fileno;
749 sprintf(passed_fileno, "%d", elf_exec_fileno);
751 if (elf_interpreter) {
752 retval = copy_strings_kernel(1, &passed_p, bprm);
754 goto out_free_dentry;
759 /* Flush all traces of the currently running executable */
760 retval = flush_old_exec(bprm);
762 goto out_free_dentry;
764 /* Discard our unneeded old files struct */
766 put_files_struct(files);
770 /* OK, This is the point of no return */
771 current->mm->start_data = 0;
772 current->mm->end_data = 0;
773 current->mm->end_code = 0;
774 current->mm->mmap = NULL;
775 current->flags &= ~PF_FORKNOEXEC;
776 current->mm->def_flags = def_flags;
778 /* Do this immediately, since STACK_TOP as used in setup_arg_pages
779 may depend on the personality. */
780 SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
781 if (elf_read_implies_exec(loc->elf_ex, executable_stack))
782 current->personality |= READ_IMPLIES_EXEC;
784 if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
785 current->flags |= PF_RANDOMIZE;
786 arch_pick_mmap_layout(current->mm);
788 /* Do this so that we can load the interpreter, if need be. We will
789 change some of these later */
790 current->mm->free_area_cache = current->mm->mmap_base;
791 current->mm->cached_hole_size = 0;
792 retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP),
795 send_sig(SIGKILL, current, 0);
796 goto out_free_dentry;
799 current->mm->start_stack = bprm->p;
801 /* Now we do a little grungy work by mmaping the ELF image into
802 the correct location in memory. At this point, we assume that
803 the image should be loaded at fixed address, not at a variable
805 for(i = 0, elf_ppnt = elf_phdata;
806 i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
807 int elf_prot = 0, elf_flags;
808 unsigned long k, vaddr;
810 if (elf_ppnt->p_type != PT_LOAD)
813 if (unlikely (elf_brk > elf_bss)) {
816 /* There was a PT_LOAD segment with p_memsz > p_filesz
817 before this one. Map anonymous pages, if needed,
818 and clear the area. */
819 retval = set_brk (elf_bss + load_bias,
820 elf_brk + load_bias);
822 send_sig(SIGKILL, current, 0);
823 goto out_free_dentry;
825 nbyte = ELF_PAGEOFFSET(elf_bss);
827 nbyte = ELF_MIN_ALIGN - nbyte;
828 if (nbyte > elf_brk - elf_bss)
829 nbyte = elf_brk - elf_bss;
830 if (clear_user((void __user *)elf_bss +
833 * This bss-zeroing can fail if the ELF
834 * file specifies odd protections. So
835 * we don't check the return value
841 if (elf_ppnt->p_flags & PF_R)
842 elf_prot |= PROT_READ;
843 if (elf_ppnt->p_flags & PF_W)
844 elf_prot |= PROT_WRITE;
845 if (elf_ppnt->p_flags & PF_X)
846 elf_prot |= PROT_EXEC;
848 elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE;
850 vaddr = elf_ppnt->p_vaddr;
851 if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
852 elf_flags |= MAP_FIXED;
853 } else if (loc->elf_ex.e_type == ET_DYN) {
854 /* Try and get dynamic programs out of the way of the
855 * default mmap base, as well as whatever program they
856 * might try to exec. This is because the brk will
857 * follow the loader, and is not movable. */
858 if (current->flags & PF_RANDOMIZE)
859 load_bias = randomize_range(0x10000,
863 load_bias = ELF_ET_DYN_BASE;
864 load_bias = ELF_PAGESTART(load_bias - vaddr);
867 error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
868 elf_prot, elf_flags);
869 if (BAD_ADDR(error)) {
870 send_sig(SIGKILL, current, 0);
871 goto out_free_dentry;
874 if (!load_addr_set) {
876 load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
877 if (loc->elf_ex.e_type == ET_DYN) {
879 ELF_PAGESTART(load_bias + vaddr);
880 load_addr += load_bias;
881 reloc_func_desc = load_bias;
884 k = elf_ppnt->p_vaddr;
891 * Check to see if the section's size will overflow the
892 * allowed task size. Note that p_filesz must always be
893 * <= p_memsz so it is only necessary to check p_memsz.
895 if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
896 elf_ppnt->p_memsz > TASK_SIZE ||
897 TASK_SIZE - elf_ppnt->p_memsz < k) {
898 /* set_brk can never work. Avoid overflows. */
899 send_sig(SIGKILL, current, 0);
900 goto out_free_dentry;
903 k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
907 if ((elf_ppnt->p_flags & PF_X) && end_code < k)
911 k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
916 loc->elf_ex.e_entry += load_bias;
917 elf_bss += load_bias;
918 elf_brk += load_bias;
919 start_code += load_bias;
920 end_code += load_bias;
921 start_data += load_bias;
922 end_data += load_bias;
924 /* Calling set_brk effectively mmaps the pages that we need
925 * for the bss and break sections. We must do this before
926 * mapping in the interpreter, to make sure it doesn't wind
927 * up getting placed where the bss needs to go.
929 retval = set_brk(elf_bss, elf_brk);
931 send_sig(SIGKILL, current, 0);
932 goto out_free_dentry;
934 if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) {
935 send_sig(SIGSEGV, current, 0);
936 retval = -EFAULT; /* Nobody gets to see this, but.. */
937 goto out_free_dentry;
940 if (elf_interpreter) {
941 if (interpreter_type == INTERPRETER_AOUT)
942 elf_entry = load_aout_interp(&loc->interp_ex,
945 elf_entry = load_elf_interp(&loc->interp_elf_ex,
948 if (BAD_ADDR(elf_entry)) {
949 force_sig(SIGSEGV, current);
950 retval = IS_ERR((void *)elf_entry) ?
951 (int)elf_entry : -EINVAL;
952 goto out_free_dentry;
954 reloc_func_desc = interp_load_addr;
956 allow_write_access(interpreter);
958 kfree(elf_interpreter);
960 elf_entry = loc->elf_ex.e_entry;
961 if (BAD_ADDR(elf_entry)) {
962 force_sig(SIGSEGV, current);
964 goto out_free_dentry;
970 if (interpreter_type != INTERPRETER_AOUT)
971 sys_close(elf_exec_fileno);
973 set_binfmt(&elf_format);
975 #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
976 retval = arch_setup_additional_pages(bprm, executable_stack);
978 send_sig(SIGKILL, current, 0);
981 #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
984 current->flags &= ~PF_FORKNOEXEC;
985 create_elf_tables(bprm, &loc->elf_ex,
986 (interpreter_type == INTERPRETER_AOUT),
987 load_addr, interp_load_addr);
988 /* N.B. passed_fileno might not be initialized? */
989 if (interpreter_type == INTERPRETER_AOUT)
990 current->mm->arg_start += strlen(passed_fileno) + 1;
991 current->mm->end_code = end_code;
992 current->mm->start_code = start_code;
993 current->mm->start_data = start_data;
994 current->mm->end_data = end_data;
995 current->mm->start_stack = bprm->p;
997 if (current->personality & MMAP_PAGE_ZERO) {
998 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
999 and some applications "depend" upon this behavior.
1000 Since we do not have the power to recompile these, we
1001 emulate the SVr4 behavior. Sigh. */
1002 down_write(¤t->mm->mmap_sem);
1003 error = do_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
1004 MAP_FIXED | MAP_PRIVATE, 0);
1005 up_write(¤t->mm->mmap_sem);
1008 #ifdef ELF_PLAT_INIT
1010 * The ABI may specify that certain registers be set up in special
1011 * ways (on i386 %edx is the address of a DT_FINI function, for
1012 * example. In addition, it may also specify (eg, PowerPC64 ELF)
1013 * that the e_entry field is the address of the function descriptor
1014 * for the startup routine, rather than the address of the startup
1015 * routine itself. This macro performs whatever initialization to
1016 * the regs structure is required as well as any relocations to the
1017 * function descriptor entries when executing dynamically links apps.
1019 ELF_PLAT_INIT(regs, reloc_func_desc);
1022 start_thread(regs, elf_entry, bprm->p);
1023 if (unlikely(current->ptrace & PT_PTRACED)) {
1024 if (current->ptrace & PT_TRACE_EXEC)
1025 ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
1027 send_sig(SIGTRAP, current, 0);
1037 allow_write_access(interpreter);
1041 kfree(elf_interpreter);
1043 sys_close(elf_exec_fileno);
1046 reset_files_struct(current, files);
1052 /* This is really simpleminded and specialized - we are loading an
1053 a.out library that is given an ELF header. */
1054 static int load_elf_library(struct file *file)
1056 struct elf_phdr *elf_phdata;
1057 struct elf_phdr *eppnt;
1058 unsigned long elf_bss, bss, len;
1059 int retval, error, i, j;
1060 struct elfhdr elf_ex;
1063 retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex));
1064 if (retval != sizeof(elf_ex))
1067 if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
1070 /* First of all, some simple consistency checks */
1071 if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
1072 !elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap)
1075 /* Now read in all of the header information */
1077 j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
1078 /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */
1081 elf_phdata = kmalloc(j, GFP_KERNEL);
1087 retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j);
1091 for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
1092 if ((eppnt + i)->p_type == PT_LOAD)
1097 while (eppnt->p_type != PT_LOAD)
1100 /* Now use mmap to map the library into memory. */
1101 down_write(¤t->mm->mmap_sem);
1102 error = do_mmap(file,
1103 ELF_PAGESTART(eppnt->p_vaddr),
1105 ELF_PAGEOFFSET(eppnt->p_vaddr)),
1106 PROT_READ | PROT_WRITE | PROT_EXEC,
1107 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
1109 ELF_PAGEOFFSET(eppnt->p_vaddr)));
1110 up_write(¤t->mm->mmap_sem);
1111 if (error != ELF_PAGESTART(eppnt->p_vaddr))
1114 elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
1115 if (padzero(elf_bss)) {
1120 len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr +
1122 bss = eppnt->p_memsz + eppnt->p_vaddr;
1124 down_write(¤t->mm->mmap_sem);
1125 do_brk(len, bss - len);
1126 up_write(¤t->mm->mmap_sem);
1137 * Note that some platforms still use traditional core dumps and not
1138 * the ELF core dump. Each platform can select it as appropriate.
1140 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
1145 * Modelled on fs/exec.c:aout_core_dump()
1146 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1149 * These are the only things you should do on a core-file: use only these
1150 * functions to write out all the necessary info.
1152 static int dump_write(struct file *file, const void *addr, int nr)
1154 return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
1157 static int dump_seek(struct file *file, loff_t off)
1159 if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
1160 if (file->f_op->llseek(file, off, SEEK_CUR) < 0)
1163 char *buf = (char *)get_zeroed_page(GFP_KERNEL);
1167 unsigned long n = off;
1170 if (!dump_write(file, buf, n))
1174 free_page((unsigned long)buf);
1180 * Decide whether a segment is worth dumping; default is yes to be
1181 * sure (missing info is worse than too much; etc).
1182 * Personally I'd include everything, and use the coredump limit...
1184 * I think we should skip something. But I am not sure how. H.J.
1186 static int maydump(struct vm_area_struct *vma)
1188 /* Do not dump I/O mapped devices or special mappings */
1189 if (vma->vm_flags & (VM_IO | VM_RESERVED))
1192 /* Dump shared memory only if mapped from an anonymous file. */
1193 if (vma->vm_flags & VM_SHARED)
1194 return vma->vm_file->f_dentry->d_inode->i_nlink == 0;
1196 /* If it hasn't been written to, don't write it out */
1203 /* An ELF note in memory */
1208 unsigned int datasz;
1212 static int notesize(struct memelfnote *en)
1216 sz = sizeof(struct elf_note);
1217 sz += roundup(strlen(en->name) + 1, 4);
1218 sz += roundup(en->datasz, 4);
1223 #define DUMP_WRITE(addr, nr, foffset) \
1224 do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0)
1226 static int alignfile(struct file *file, loff_t *foffset)
1228 static const char buf[4] = { 0, };
1229 DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset);
1233 static int writenote(struct memelfnote *men, struct file *file,
1237 en.n_namesz = strlen(men->name) + 1;
1238 en.n_descsz = men->datasz;
1239 en.n_type = men->type;
1241 DUMP_WRITE(&en, sizeof(en), foffset);
1242 DUMP_WRITE(men->name, en.n_namesz, foffset);
1243 if (!alignfile(file, foffset))
1245 DUMP_WRITE(men->data, men->datasz, foffset);
1246 if (!alignfile(file, foffset))
1253 #define DUMP_WRITE(addr, nr) \
1254 if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
1256 #define DUMP_SEEK(off) \
1257 if (!dump_seek(file, (off))) \
1260 static void fill_elf_header(struct elfhdr *elf, int segs)
1262 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1263 elf->e_ident[EI_CLASS] = ELF_CLASS;
1264 elf->e_ident[EI_DATA] = ELF_DATA;
1265 elf->e_ident[EI_VERSION] = EV_CURRENT;
1266 elf->e_ident[EI_OSABI] = ELF_OSABI;
1267 memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
1269 elf->e_type = ET_CORE;
1270 elf->e_machine = ELF_ARCH;
1271 elf->e_version = EV_CURRENT;
1273 elf->e_phoff = sizeof(struct elfhdr);
1275 elf->e_flags = ELF_CORE_EFLAGS;
1276 elf->e_ehsize = sizeof(struct elfhdr);
1277 elf->e_phentsize = sizeof(struct elf_phdr);
1278 elf->e_phnum = segs;
1279 elf->e_shentsize = 0;
1281 elf->e_shstrndx = 0;
1285 static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1287 phdr->p_type = PT_NOTE;
1288 phdr->p_offset = offset;
1291 phdr->p_filesz = sz;
1298 static void fill_note(struct memelfnote *note, const char *name, int type,
1299 unsigned int sz, void *data)
1309 * fill up all the fields in prstatus from the given task struct, except
1310 * registers which need to be filled up separately.
1312 static void fill_prstatus(struct elf_prstatus *prstatus,
1313 struct task_struct *p, long signr)
1315 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1316 prstatus->pr_sigpend = p->pending.signal.sig[0];
1317 prstatus->pr_sighold = p->blocked.sig[0];
1318 prstatus->pr_pid = p->pid;
1319 prstatus->pr_ppid = p->parent->pid;
1320 prstatus->pr_pgrp = process_group(p);
1321 prstatus->pr_sid = p->signal->session;
1322 if (thread_group_leader(p)) {
1324 * This is the record for the group leader. Add in the
1325 * cumulative times of previous dead threads. This total
1326 * won't include the time of each live thread whose state
1327 * is included in the core dump. The final total reported
1328 * to our parent process when it calls wait4 will include
1329 * those sums as well as the little bit more time it takes
1330 * this and each other thread to finish dying after the
1331 * core dump synchronization phase.
1333 cputime_to_timeval(cputime_add(p->utime, p->signal->utime),
1334 &prstatus->pr_utime);
1335 cputime_to_timeval(cputime_add(p->stime, p->signal->stime),
1336 &prstatus->pr_stime);
1338 cputime_to_timeval(p->utime, &prstatus->pr_utime);
1339 cputime_to_timeval(p->stime, &prstatus->pr_stime);
1341 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1342 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1345 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1346 struct mm_struct *mm)
1348 unsigned int i, len;
1350 /* first copy the parameters from user space */
1351 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1353 len = mm->arg_end - mm->arg_start;
1354 if (len >= ELF_PRARGSZ)
1355 len = ELF_PRARGSZ-1;
1356 if (copy_from_user(&psinfo->pr_psargs,
1357 (const char __user *)mm->arg_start, len))
1359 for(i = 0; i < len; i++)
1360 if (psinfo->pr_psargs[i] == 0)
1361 psinfo->pr_psargs[i] = ' ';
1362 psinfo->pr_psargs[len] = 0;
1364 psinfo->pr_pid = p->pid;
1365 psinfo->pr_ppid = p->parent->pid;
1366 psinfo->pr_pgrp = process_group(p);
1367 psinfo->pr_sid = p->signal->session;
1369 i = p->state ? ffz(~p->state) + 1 : 0;
1370 psinfo->pr_state = i;
1371 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1372 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1373 psinfo->pr_nice = task_nice(p);
1374 psinfo->pr_flag = p->flags;
1375 SET_UID(psinfo->pr_uid, p->uid);
1376 SET_GID(psinfo->pr_gid, p->gid);
1377 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1382 /* Here is the structure in which status of each thread is captured. */
1383 struct elf_thread_status
1385 struct list_head list;
1386 struct elf_prstatus prstatus; /* NT_PRSTATUS */
1387 elf_fpregset_t fpu; /* NT_PRFPREG */
1388 struct task_struct *thread;
1389 #ifdef ELF_CORE_COPY_XFPREGS
1390 elf_fpxregset_t xfpu; /* NT_PRXFPREG */
1392 struct memelfnote notes[3];
1397 * In order to add the specific thread information for the elf file format,
1398 * we need to keep a linked list of every threads pr_status and then create
1399 * a single section for them in the final core file.
1401 static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1404 struct task_struct *p = t->thread;
1407 fill_prstatus(&t->prstatus, p, signr);
1408 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1410 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1413 sz += notesize(&t->notes[0]);
1415 if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL,
1417 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1420 sz += notesize(&t->notes[1]);
1423 #ifdef ELF_CORE_COPY_XFPREGS
1424 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1425 fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu),
1428 sz += notesize(&t->notes[2]);
1437 * This is a two-pass process; first we find the offsets of the bits,
1438 * and then they are actually written out. If we run out of core limit
1441 static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file)
1449 struct vm_area_struct *vma;
1450 struct elfhdr *elf = NULL;
1451 loff_t offset = 0, dataoff, foffset;
1452 unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
1454 struct memelfnote *notes = NULL;
1455 struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
1456 struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
1457 struct task_struct *g, *p;
1458 LIST_HEAD(thread_list);
1459 struct list_head *t;
1460 elf_fpregset_t *fpu = NULL;
1461 #ifdef ELF_CORE_COPY_XFPREGS
1462 elf_fpxregset_t *xfpu = NULL;
1464 int thread_status_size = 0;
1468 * We no longer stop all VM operations.
1470 * This is because those proceses that could possibly change map_count
1471 * or the mmap / vma pages are now blocked in do_exit on current
1472 * finishing this core dump.
1474 * Only ptrace can touch these memory addresses, but it doesn't change
1475 * the map_count or the pages allocated. So no possibility of crashing
1476 * exists while dumping the mm->vm_next areas to the core file.
1479 /* alloc memory for large data structures: too large to be on stack */
1480 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1483 prstatus = kmalloc(sizeof(*prstatus), GFP_KERNEL);
1486 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1489 notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
1492 fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
1495 #ifdef ELF_CORE_COPY_XFPREGS
1496 xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
1502 struct elf_thread_status *tmp;
1505 if (current->mm == p->mm && current != p) {
1506 tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC);
1512 list_add(&tmp->list, &thread_list);
1514 while_each_thread(g,p);
1516 list_for_each(t, &thread_list) {
1517 struct elf_thread_status *tmp;
1520 tmp = list_entry(t, struct elf_thread_status, list);
1521 sz = elf_dump_thread_status(signr, tmp);
1522 thread_status_size += sz;
1525 /* now collect the dump for the current */
1526 memset(prstatus, 0, sizeof(*prstatus));
1527 fill_prstatus(prstatus, current, signr);
1528 elf_core_copy_regs(&prstatus->pr_reg, regs);
1530 segs = current->mm->map_count;
1531 #ifdef ELF_CORE_EXTRA_PHDRS
1532 segs += ELF_CORE_EXTRA_PHDRS;
1536 fill_elf_header(elf, segs + 1); /* including notes section */
1539 current->flags |= PF_DUMPCORE;
1542 * Set up the notes in similar form to SVR4 core dumps made
1543 * with info from their /proc.
1546 fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
1547 fill_psinfo(psinfo, current->group_leader, current->mm);
1548 fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1552 auxv = (elf_addr_t *)current->mm->saved_auxv;
1557 while (auxv[i - 2] != AT_NULL);
1558 fill_note(¬es[numnote++], "CORE", NT_AUXV,
1559 i * sizeof(elf_addr_t), auxv);
1561 /* Try to dump the FPU. */
1562 if ((prstatus->pr_fpvalid =
1563 elf_core_copy_task_fpregs(current, regs, fpu)))
1564 fill_note(notes + numnote++,
1565 "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
1566 #ifdef ELF_CORE_COPY_XFPREGS
1567 if (elf_core_copy_task_xfpregs(current, xfpu))
1568 fill_note(notes + numnote++,
1569 "LINUX", NT_PRXFPREG, sizeof(*xfpu), xfpu);
1575 DUMP_WRITE(elf, sizeof(*elf));
1576 offset += sizeof(*elf); /* Elf header */
1577 offset += (segs + 1) * sizeof(struct elf_phdr); /* Program headers */
1580 /* Write notes phdr entry */
1582 struct elf_phdr phdr;
1585 for (i = 0; i < numnote; i++)
1586 sz += notesize(notes + i);
1588 sz += thread_status_size;
1590 #ifdef ELF_CORE_WRITE_EXTRA_NOTES
1591 sz += ELF_CORE_EXTRA_NOTES_SIZE;
1594 fill_elf_note_phdr(&phdr, sz, offset);
1596 DUMP_WRITE(&phdr, sizeof(phdr));
1599 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1601 /* Write program headers for segments dump */
1602 for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
1603 struct elf_phdr phdr;
1606 sz = vma->vm_end - vma->vm_start;
1608 phdr.p_type = PT_LOAD;
1609 phdr.p_offset = offset;
1610 phdr.p_vaddr = vma->vm_start;
1612 phdr.p_filesz = maydump(vma) ? sz : 0;
1614 offset += phdr.p_filesz;
1615 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
1616 if (vma->vm_flags & VM_WRITE)
1617 phdr.p_flags |= PF_W;
1618 if (vma->vm_flags & VM_EXEC)
1619 phdr.p_flags |= PF_X;
1620 phdr.p_align = ELF_EXEC_PAGESIZE;
1622 DUMP_WRITE(&phdr, sizeof(phdr));
1625 #ifdef ELF_CORE_WRITE_EXTRA_PHDRS
1626 ELF_CORE_WRITE_EXTRA_PHDRS;
1629 /* write out the notes section */
1630 for (i = 0; i < numnote; i++)
1631 if (!writenote(notes + i, file, &foffset))
1634 #ifdef ELF_CORE_WRITE_EXTRA_NOTES
1635 ELF_CORE_WRITE_EXTRA_NOTES;
1638 /* write out the thread status notes section */
1639 list_for_each(t, &thread_list) {
1640 struct elf_thread_status *tmp =
1641 list_entry(t, struct elf_thread_status, list);
1643 for (i = 0; i < tmp->num_notes; i++)
1644 if (!writenote(&tmp->notes[i], file, &foffset))
1649 DUMP_SEEK(dataoff - foffset);
1651 for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
1657 for (addr = vma->vm_start;
1659 addr += PAGE_SIZE) {
1661 struct vm_area_struct *vma;
1663 if (get_user_pages(current, current->mm, addr, 1, 0, 1,
1664 &page, &vma) <= 0) {
1665 DUMP_SEEK(PAGE_SIZE);
1667 if (page == ZERO_PAGE(addr)) {
1668 DUMP_SEEK(PAGE_SIZE);
1671 flush_cache_page(vma, addr,
1674 if ((size += PAGE_SIZE) > limit ||
1675 !dump_write(file, kaddr,
1678 page_cache_release(page);
1683 page_cache_release(page);
1688 #ifdef ELF_CORE_WRITE_EXTRA_DATA
1689 ELF_CORE_WRITE_EXTRA_DATA;
1696 while (!list_empty(&thread_list)) {
1697 struct list_head *tmp = thread_list.next;
1699 kfree(list_entry(tmp, struct elf_thread_status, list));
1707 #ifdef ELF_CORE_COPY_XFPREGS
1714 #endif /* USE_ELF_CORE_DUMP */
1716 static int __init init_elf_binfmt(void)
1718 return register_binfmt(&elf_format);
1721 static void __exit exit_elf_binfmt(void)
1723 /* Remove the COFF and ELF loaders. */
1724 unregister_binfmt(&elf_format);
1727 core_initcall(init_elf_binfmt);
1728 module_exit(exit_elf_binfmt);
1729 MODULE_LICENSE("GPL");