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 #define elf_addr_t unsigned long
55 * If we don't support core dumping, then supply a NULL so we
58 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
59 static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file);
61 #define elf_core_dump NULL
64 #if ELF_EXEC_PAGESIZE > PAGE_SIZE
65 #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE
67 #define ELF_MIN_ALIGN PAGE_SIZE
70 #ifndef ELF_CORE_EFLAGS
71 #define ELF_CORE_EFLAGS 0
74 #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
75 #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
76 #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
78 static struct linux_binfmt elf_format = {
79 .module = THIS_MODULE,
80 .load_binary = load_elf_binary,
81 .load_shlib = load_elf_library,
82 .core_dump = elf_core_dump,
83 .min_coredump = ELF_EXEC_PAGESIZE
86 #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
88 static int set_brk(unsigned long start, unsigned long end)
90 start = ELF_PAGEALIGN(start);
91 end = ELF_PAGEALIGN(end);
94 down_write(¤t->mm->mmap_sem);
95 addr = do_brk(start, end - start);
96 up_write(¤t->mm->mmap_sem);
100 current->mm->start_brk = current->mm->brk = end;
104 /* We need to explicitly zero any fractional pages
105 after the data section (i.e. bss). This would
106 contain the junk from the file that should not
109 static int padzero(unsigned long elf_bss)
113 nbyte = ELF_PAGEOFFSET(elf_bss);
115 nbyte = ELF_MIN_ALIGN - nbyte;
116 if (clear_user((void __user *) elf_bss, nbyte))
122 /* Let's use some macros to make this stack manipulation a litle clearer */
123 #ifdef CONFIG_STACK_GROWSUP
124 #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
125 #define STACK_ROUND(sp, items) \
126 ((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
127 #define STACK_ALLOC(sp, len) ({ \
128 elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \
131 #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
132 #define STACK_ROUND(sp, items) \
133 (((unsigned long) (sp - items)) &~ 15UL)
134 #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
138 create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
139 int interp_aout, unsigned long load_addr,
140 unsigned long interp_load_addr)
142 unsigned long p = bprm->p;
143 int argc = bprm->argc;
144 int envc = bprm->envc;
145 elf_addr_t __user *argv;
146 elf_addr_t __user *envp;
147 elf_addr_t __user *sp;
148 elf_addr_t __user *u_platform;
149 const char *k_platform = ELF_PLATFORM;
151 elf_addr_t *elf_info;
153 struct task_struct *tsk = current;
156 * If this architecture has a platform capability string, copy it
157 * to userspace. In some cases (Sparc), this info is impossible
158 * for userspace to get any other way, in others (i386) it is
163 size_t len = strlen(k_platform) + 1;
166 * In some cases (e.g. Hyper-Threading), we want to avoid L1
167 * evictions by the processes running on the same package. One
168 * thing we can do is to shuffle the initial stack for them.
171 p = arch_align_stack(p);
173 u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
174 if (__copy_to_user(u_platform, k_platform, len))
178 /* Create the ELF interpreter info */
179 elf_info = (elf_addr_t *)current->mm->saved_auxv;
180 #define NEW_AUX_ENT(id, val) \
182 elf_info[ei_index++] = id; \
183 elf_info[ei_index++] = val; \
188 * ARCH_DLINFO must come first so PPC can do its special alignment of
193 NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
194 NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE);
195 NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
196 NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff);
197 NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
198 NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
199 NEW_AUX_ENT(AT_BASE, interp_load_addr);
200 NEW_AUX_ENT(AT_FLAGS, 0);
201 NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
202 NEW_AUX_ENT(AT_UID, tsk->uid);
203 NEW_AUX_ENT(AT_EUID, tsk->euid);
204 NEW_AUX_ENT(AT_GID, tsk->gid);
205 NEW_AUX_ENT(AT_EGID, tsk->egid);
206 NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
208 NEW_AUX_ENT(AT_PLATFORM,
209 (elf_addr_t)(unsigned long)u_platform);
211 if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
212 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
215 /* AT_NULL is zero; clear the rest too */
216 memset(&elf_info[ei_index], 0,
217 sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]);
219 /* And advance past the AT_NULL entry. */
222 sp = STACK_ADD(p, ei_index);
224 items = (argc + 1) + (envc + 1);
226 items += 3; /* a.out interpreters require argv & envp too */
228 items += 1; /* ELF interpreters only put argc on the stack */
230 bprm->p = STACK_ROUND(sp, items);
232 /* Point sp at the lowest address on the stack */
233 #ifdef CONFIG_STACK_GROWSUP
234 sp = (elf_addr_t __user *)bprm->p - items - ei_index;
235 bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */
237 sp = (elf_addr_t __user *)bprm->p;
240 /* Now, let's put argc (and argv, envp if appropriate) on the stack */
241 if (__put_user(argc, sp++))
245 envp = argv + argc + 1;
246 __put_user((elf_addr_t)(unsigned long)argv, sp++);
247 __put_user((elf_addr_t)(unsigned long)envp, sp++);
250 envp = argv + argc + 1;
253 /* Populate argv and envp */
254 p = current->mm->arg_end = current->mm->arg_start;
257 __put_user((elf_addr_t)p, argv++);
258 len = strnlen_user((void __user *)p, PAGE_SIZE*MAX_ARG_PAGES);
259 if (!len || len > PAGE_SIZE*MAX_ARG_PAGES)
263 if (__put_user(0, argv))
265 current->mm->arg_end = current->mm->env_start = p;
268 __put_user((elf_addr_t)p, envp++);
269 len = strnlen_user((void __user *)p, PAGE_SIZE*MAX_ARG_PAGES);
270 if (!len || len > PAGE_SIZE*MAX_ARG_PAGES)
274 if (__put_user(0, envp))
276 current->mm->env_end = p;
278 /* Put the elf_info on the stack in the right place. */
279 sp = (elf_addr_t __user *)envp + 1;
280 if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t)))
287 static unsigned long elf_map(struct file *filep, unsigned long addr,
288 struct elf_phdr *eppnt, int prot, int type)
290 unsigned long map_addr;
291 unsigned long pageoffset = ELF_PAGEOFFSET(eppnt->p_vaddr);
293 down_write(¤t->mm->mmap_sem);
294 /* mmap() will return -EINVAL if given a zero size, but a
295 * segment with zero filesize is perfectly valid */
296 if (eppnt->p_filesz + pageoffset)
297 map_addr = do_mmap(filep, ELF_PAGESTART(addr),
298 eppnt->p_filesz + pageoffset, prot, type,
299 eppnt->p_offset - pageoffset);
301 map_addr = ELF_PAGESTART(addr);
302 up_write(¤t->mm->mmap_sem);
306 #endif /* !elf_map */
308 /* This is much more generalized than the library routine read function,
309 so we keep this separate. Technically the library read function
310 is only provided so that we can read a.out libraries that have
313 static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
314 struct file *interpreter, unsigned long *interp_load_addr)
316 struct elf_phdr *elf_phdata;
317 struct elf_phdr *eppnt;
318 unsigned long load_addr = 0;
319 int load_addr_set = 0;
320 unsigned long last_bss = 0, elf_bss = 0;
321 unsigned long error = ~0UL;
324 /* First of all, some simple consistency checks */
325 if (interp_elf_ex->e_type != ET_EXEC &&
326 interp_elf_ex->e_type != ET_DYN)
328 if (!elf_check_arch(interp_elf_ex))
330 if (!interpreter->f_op || !interpreter->f_op->mmap)
334 * If the size of this structure has changed, then punt, since
335 * we will be doing the wrong thing.
337 if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr))
339 if (interp_elf_ex->e_phnum < 1 ||
340 interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr))
343 /* Now read in all of the header information */
344 size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum;
345 if (size > ELF_MIN_ALIGN)
347 elf_phdata = kmalloc(size, GFP_KERNEL);
351 retval = kernel_read(interpreter, interp_elf_ex->e_phoff,
352 (char *)elf_phdata,size);
354 if (retval != size) {
361 for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
362 if (eppnt->p_type == PT_LOAD) {
363 int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
365 unsigned long vaddr = 0;
366 unsigned long k, map_addr;
368 if (eppnt->p_flags & PF_R)
369 elf_prot = PROT_READ;
370 if (eppnt->p_flags & PF_W)
371 elf_prot |= PROT_WRITE;
372 if (eppnt->p_flags & PF_X)
373 elf_prot |= PROT_EXEC;
374 vaddr = eppnt->p_vaddr;
375 if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
376 elf_type |= MAP_FIXED;
378 map_addr = elf_map(interpreter, load_addr + vaddr,
379 eppnt, elf_prot, elf_type);
381 if (BAD_ADDR(map_addr))
384 if (!load_addr_set &&
385 interp_elf_ex->e_type == ET_DYN) {
386 load_addr = map_addr - ELF_PAGESTART(vaddr);
391 * Check to see if the section's size will overflow the
392 * allowed task size. Note that p_filesz must always be
393 * <= p_memsize so it's only necessary to check p_memsz.
395 k = load_addr + eppnt->p_vaddr;
397 eppnt->p_filesz > eppnt->p_memsz ||
398 eppnt->p_memsz > TASK_SIZE ||
399 TASK_SIZE - eppnt->p_memsz < k) {
405 * Find the end of the file mapping for this phdr, and
406 * keep track of the largest address we see for this.
408 k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
413 * Do the same thing for the memory mapping - between
414 * elf_bss and last_bss is the bss section.
416 k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
423 * Now fill out the bss section. First pad the last page up
424 * to the page boundary, and then perform a mmap to make sure
425 * that there are zero-mapped pages up to and including the
428 if (padzero(elf_bss)) {
433 /* What we have mapped so far */
434 elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1);
436 /* Map the last of the bss segment */
437 if (last_bss > elf_bss) {
438 down_write(¤t->mm->mmap_sem);
439 error = do_brk(elf_bss, last_bss - elf_bss);
440 up_write(¤t->mm->mmap_sem);
445 *interp_load_addr = load_addr;
446 error = ((unsigned long)interp_elf_ex->e_entry) + load_addr;
454 static unsigned long load_aout_interp(struct exec *interp_ex,
455 struct file *interpreter)
457 unsigned long text_data, elf_entry = ~0UL;
461 current->mm->end_code = interp_ex->a_text;
462 text_data = interp_ex->a_text + interp_ex->a_data;
463 current->mm->end_data = text_data;
464 current->mm->brk = interp_ex->a_bss + text_data;
466 switch (N_MAGIC(*interp_ex)) {
469 addr = (char __user *)0;
473 offset = N_TXTOFF(*interp_ex);
474 addr = (char __user *)N_TXTADDR(*interp_ex);
480 down_write(¤t->mm->mmap_sem);
481 do_brk(0, text_data);
482 up_write(¤t->mm->mmap_sem);
483 if (!interpreter->f_op || !interpreter->f_op->read)
485 if (interpreter->f_op->read(interpreter, addr, text_data, &offset) < 0)
487 flush_icache_range((unsigned long)addr,
488 (unsigned long)addr + text_data);
490 down_write(¤t->mm->mmap_sem);
491 do_brk(ELF_PAGESTART(text_data + ELF_MIN_ALIGN - 1),
493 up_write(¤t->mm->mmap_sem);
494 elf_entry = interp_ex->a_entry;
501 * These are the functions used to load ELF style executables and shared
502 * libraries. There is no binary dependent code anywhere else.
505 #define INTERPRETER_NONE 0
506 #define INTERPRETER_AOUT 1
507 #define INTERPRETER_ELF 2
509 #ifndef STACK_RND_MASK
510 #define STACK_RND_MASK 0x7ff /* with 4K pages 8MB of VA */
513 static unsigned long randomize_stack_top(unsigned long stack_top)
515 unsigned int random_variable = 0;
517 if ((current->flags & PF_RANDOMIZE) &&
518 !(current->personality & ADDR_NO_RANDOMIZE)) {
519 random_variable = get_random_int() & STACK_RND_MASK;
520 random_variable <<= PAGE_SHIFT;
522 #ifdef CONFIG_STACK_GROWSUP
523 return PAGE_ALIGN(stack_top) + random_variable;
525 return PAGE_ALIGN(stack_top) - random_variable;
529 static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs)
531 struct file *interpreter = NULL; /* to shut gcc up */
532 unsigned long load_addr = 0, load_bias = 0;
533 int load_addr_set = 0;
534 char * elf_interpreter = NULL;
535 unsigned int interpreter_type = INTERPRETER_NONE;
536 unsigned char ibcs2_interpreter = 0;
538 struct elf_phdr *elf_ppnt, *elf_phdata;
539 unsigned long elf_bss, elf_brk;
543 unsigned long elf_entry, interp_load_addr = 0;
544 unsigned long start_code, end_code, start_data, end_data;
545 unsigned long reloc_func_desc = 0;
546 char passed_fileno[6];
547 struct files_struct *files;
548 int have_pt_gnu_stack, executable_stack = EXSTACK_DEFAULT;
549 unsigned long def_flags = 0;
551 struct elfhdr elf_ex;
552 struct elfhdr interp_elf_ex;
553 struct exec interp_ex;
556 loc = kmalloc(sizeof(*loc), GFP_KERNEL);
562 /* Get the exec-header */
563 loc->elf_ex = *((struct elfhdr *)bprm->buf);
566 /* First of all, some simple consistency checks */
567 if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
570 if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN)
572 if (!elf_check_arch(&loc->elf_ex))
574 if (!bprm->file->f_op||!bprm->file->f_op->mmap)
577 /* Now read in all of the header information */
578 if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr))
580 if (loc->elf_ex.e_phnum < 1 ||
581 loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr))
583 size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr);
585 elf_phdata = kmalloc(size, GFP_KERNEL);
589 retval = kernel_read(bprm->file, loc->elf_ex.e_phoff,
590 (char *)elf_phdata, size);
591 if (retval != size) {
597 files = current->files; /* Refcounted so ok */
598 retval = unshare_files();
601 if (files == current->files) {
602 put_files_struct(files);
606 /* exec will make our files private anyway, but for the a.out
607 loader stuff we need to do it earlier */
608 retval = get_unused_fd();
611 get_file(bprm->file);
612 fd_install(elf_exec_fileno = retval, bprm->file);
614 elf_ppnt = elf_phdata;
623 for (i = 0; i < loc->elf_ex.e_phnum; i++) {
624 if (elf_ppnt->p_type == PT_INTERP) {
625 /* This is the program interpreter used for
626 * shared libraries - for now assume that this
627 * is an a.out format binary
630 if (elf_ppnt->p_filesz > PATH_MAX ||
631 elf_ppnt->p_filesz < 2)
635 elf_interpreter = kmalloc(elf_ppnt->p_filesz,
637 if (!elf_interpreter)
640 retval = kernel_read(bprm->file, elf_ppnt->p_offset,
643 if (retval != elf_ppnt->p_filesz) {
646 goto out_free_interp;
648 /* make sure path is NULL terminated */
650 if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
651 goto out_free_interp;
653 /* If the program interpreter is one of these two,
654 * then assume an iBCS2 image. Otherwise assume
655 * a native linux image.
657 if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
658 strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0)
659 ibcs2_interpreter = 1;
662 * The early SET_PERSONALITY here is so that the lookup
663 * for the interpreter happens in the namespace of the
664 * to-be-execed image. SET_PERSONALITY can select an
667 * However, SET_PERSONALITY is NOT allowed to switch
668 * this task into the new images's memory mapping
669 * policy - that is, TASK_SIZE must still evaluate to
670 * that which is appropriate to the execing application.
671 * This is because exit_mmap() needs to have TASK_SIZE
672 * evaluate to the size of the old image.
674 * So if (say) a 64-bit application is execing a 32-bit
675 * application it is the architecture's responsibility
676 * to defer changing the value of TASK_SIZE until the
677 * switch really is going to happen - do this in
678 * flush_thread(). - akpm
680 SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
682 interpreter = open_exec(elf_interpreter);
683 retval = PTR_ERR(interpreter);
684 if (IS_ERR(interpreter))
685 goto out_free_interp;
686 retval = kernel_read(interpreter, 0, bprm->buf,
688 if (retval != BINPRM_BUF_SIZE) {
691 goto out_free_dentry;
694 /* Get the exec headers */
695 loc->interp_ex = *((struct exec *)bprm->buf);
696 loc->interp_elf_ex = *((struct elfhdr *)bprm->buf);
702 elf_ppnt = elf_phdata;
703 for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++)
704 if (elf_ppnt->p_type == PT_GNU_STACK) {
705 if (elf_ppnt->p_flags & PF_X)
706 executable_stack = EXSTACK_ENABLE_X;
708 executable_stack = EXSTACK_DISABLE_X;
711 have_pt_gnu_stack = (i < loc->elf_ex.e_phnum);
713 /* Some simple consistency checks for the interpreter */
714 if (elf_interpreter) {
715 interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
717 /* Now figure out which format our binary is */
718 if ((N_MAGIC(loc->interp_ex) != OMAGIC) &&
719 (N_MAGIC(loc->interp_ex) != ZMAGIC) &&
720 (N_MAGIC(loc->interp_ex) != QMAGIC))
721 interpreter_type = INTERPRETER_ELF;
723 if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
724 interpreter_type &= ~INTERPRETER_ELF;
727 if (!interpreter_type)
728 goto out_free_dentry;
730 /* Make sure only one type was selected */
731 if ((interpreter_type & INTERPRETER_ELF) &&
732 interpreter_type != INTERPRETER_ELF) {
733 // FIXME - ratelimit this before re-enabling
734 // printk(KERN_WARNING "ELF: Ambiguous type, using ELF\n");
735 interpreter_type = INTERPRETER_ELF;
737 /* Verify the interpreter has a valid arch */
738 if ((interpreter_type == INTERPRETER_ELF) &&
739 !elf_check_arch(&loc->interp_elf_ex))
740 goto out_free_dentry;
742 /* Executables without an interpreter also need a personality */
743 SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
746 /* OK, we are done with that, now set up the arg stuff,
747 and then start this sucker up */
748 if ((!bprm->sh_bang) && (interpreter_type == INTERPRETER_AOUT)) {
749 char *passed_p = passed_fileno;
750 sprintf(passed_fileno, "%d", elf_exec_fileno);
752 if (elf_interpreter) {
753 retval = copy_strings_kernel(1, &passed_p, bprm);
755 goto out_free_dentry;
760 /* Flush all traces of the currently running executable */
761 retval = flush_old_exec(bprm);
763 goto out_free_dentry;
765 /* Discard our unneeded old files struct */
767 put_files_struct(files);
771 /* OK, This is the point of no return */
772 current->mm->start_data = 0;
773 current->mm->end_data = 0;
774 current->mm->end_code = 0;
775 current->mm->mmap = NULL;
776 current->flags &= ~PF_FORKNOEXEC;
777 current->mm->def_flags = def_flags;
779 /* Do this immediately, since STACK_TOP as used in setup_arg_pages
780 may depend on the personality. */
781 SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
782 if (elf_read_implies_exec(loc->elf_ex, executable_stack))
783 current->personality |= READ_IMPLIES_EXEC;
785 if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
786 current->flags |= PF_RANDOMIZE;
787 arch_pick_mmap_layout(current->mm);
789 /* Do this so that we can load the interpreter, if need be. We will
790 change some of these later */
791 current->mm->free_area_cache = current->mm->mmap_base;
792 current->mm->cached_hole_size = 0;
793 retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP),
796 send_sig(SIGKILL, current, 0);
797 goto out_free_dentry;
800 current->mm->start_stack = bprm->p;
802 /* Now we do a little grungy work by mmaping the ELF image into
803 the correct location in memory. At this point, we assume that
804 the image should be loaded at fixed address, not at a variable
806 for(i = 0, elf_ppnt = elf_phdata;
807 i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
808 int elf_prot = 0, elf_flags;
809 unsigned long k, vaddr;
811 if (elf_ppnt->p_type != PT_LOAD)
814 if (unlikely (elf_brk > elf_bss)) {
817 /* There was a PT_LOAD segment with p_memsz > p_filesz
818 before this one. Map anonymous pages, if needed,
819 and clear the area. */
820 retval = set_brk (elf_bss + load_bias,
821 elf_brk + load_bias);
823 send_sig(SIGKILL, current, 0);
824 goto out_free_dentry;
826 nbyte = ELF_PAGEOFFSET(elf_bss);
828 nbyte = ELF_MIN_ALIGN - nbyte;
829 if (nbyte > elf_brk - elf_bss)
830 nbyte = elf_brk - elf_bss;
831 if (clear_user((void __user *)elf_bss +
834 * This bss-zeroing can fail if the ELF
835 * file specifies odd protections. So
836 * we don't check the return value
842 if (elf_ppnt->p_flags & PF_R)
843 elf_prot |= PROT_READ;
844 if (elf_ppnt->p_flags & PF_W)
845 elf_prot |= PROT_WRITE;
846 if (elf_ppnt->p_flags & PF_X)
847 elf_prot |= PROT_EXEC;
849 elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE;
851 vaddr = elf_ppnt->p_vaddr;
852 if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
853 elf_flags |= MAP_FIXED;
854 } else if (loc->elf_ex.e_type == ET_DYN) {
855 /* Try and get dynamic programs out of the way of the
856 * default mmap base, as well as whatever program they
857 * might try to exec. This is because the brk will
858 * follow the loader, and is not movable. */
859 if (current->flags & PF_RANDOMIZE)
860 load_bias = randomize_range(0x10000,
864 load_bias = ELF_ET_DYN_BASE;
865 load_bias = ELF_PAGESTART(load_bias - vaddr);
868 error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
869 elf_prot, elf_flags);
870 if (BAD_ADDR(error)) {
871 send_sig(SIGKILL, current, 0);
872 goto out_free_dentry;
875 if (!load_addr_set) {
877 load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
878 if (loc->elf_ex.e_type == ET_DYN) {
880 ELF_PAGESTART(load_bias + vaddr);
881 load_addr += load_bias;
882 reloc_func_desc = load_bias;
885 k = elf_ppnt->p_vaddr;
892 * Check to see if the section's size will overflow the
893 * allowed task size. Note that p_filesz must always be
894 * <= p_memsz so it is only necessary to check p_memsz.
896 if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
897 elf_ppnt->p_memsz > TASK_SIZE ||
898 TASK_SIZE - elf_ppnt->p_memsz < k) {
899 /* set_brk can never work. Avoid overflows. */
900 send_sig(SIGKILL, current, 0);
901 goto out_free_dentry;
904 k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
908 if ((elf_ppnt->p_flags & PF_X) && end_code < k)
912 k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
917 loc->elf_ex.e_entry += load_bias;
918 elf_bss += load_bias;
919 elf_brk += load_bias;
920 start_code += load_bias;
921 end_code += load_bias;
922 start_data += load_bias;
923 end_data += load_bias;
925 /* Calling set_brk effectively mmaps the pages that we need
926 * for the bss and break sections. We must do this before
927 * mapping in the interpreter, to make sure it doesn't wind
928 * up getting placed where the bss needs to go.
930 retval = set_brk(elf_bss, elf_brk);
932 send_sig(SIGKILL, current, 0);
933 goto out_free_dentry;
935 if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) {
936 send_sig(SIGSEGV, current, 0);
937 retval = -EFAULT; /* Nobody gets to see this, but.. */
938 goto out_free_dentry;
941 if (elf_interpreter) {
942 if (interpreter_type == INTERPRETER_AOUT)
943 elf_entry = load_aout_interp(&loc->interp_ex,
946 elf_entry = load_elf_interp(&loc->interp_elf_ex,
949 if (BAD_ADDR(elf_entry)) {
950 force_sig(SIGSEGV, current);
951 retval = IS_ERR((void *)elf_entry) ?
952 (int)elf_entry : -EINVAL;
953 goto out_free_dentry;
955 reloc_func_desc = interp_load_addr;
957 allow_write_access(interpreter);
959 kfree(elf_interpreter);
961 elf_entry = loc->elf_ex.e_entry;
962 if (BAD_ADDR(elf_entry)) {
963 force_sig(SIGSEGV, current);
965 goto out_free_dentry;
971 if (interpreter_type != INTERPRETER_AOUT)
972 sys_close(elf_exec_fileno);
974 set_binfmt(&elf_format);
976 #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
977 retval = arch_setup_additional_pages(bprm, executable_stack);
979 send_sig(SIGKILL, current, 0);
982 #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
985 current->flags &= ~PF_FORKNOEXEC;
986 create_elf_tables(bprm, &loc->elf_ex,
987 (interpreter_type == INTERPRETER_AOUT),
988 load_addr, interp_load_addr);
989 /* N.B. passed_fileno might not be initialized? */
990 if (interpreter_type == INTERPRETER_AOUT)
991 current->mm->arg_start += strlen(passed_fileno) + 1;
992 current->mm->end_code = end_code;
993 current->mm->start_code = start_code;
994 current->mm->start_data = start_data;
995 current->mm->end_data = end_data;
996 current->mm->start_stack = bprm->p;
998 if (current->personality & MMAP_PAGE_ZERO) {
999 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
1000 and some applications "depend" upon this behavior.
1001 Since we do not have the power to recompile these, we
1002 emulate the SVr4 behavior. Sigh. */
1003 down_write(¤t->mm->mmap_sem);
1004 error = do_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
1005 MAP_FIXED | MAP_PRIVATE, 0);
1006 up_write(¤t->mm->mmap_sem);
1009 #ifdef ELF_PLAT_INIT
1011 * The ABI may specify that certain registers be set up in special
1012 * ways (on i386 %edx is the address of a DT_FINI function, for
1013 * example. In addition, it may also specify (eg, PowerPC64 ELF)
1014 * that the e_entry field is the address of the function descriptor
1015 * for the startup routine, rather than the address of the startup
1016 * routine itself. This macro performs whatever initialization to
1017 * the regs structure is required as well as any relocations to the
1018 * function descriptor entries when executing dynamically links apps.
1020 ELF_PLAT_INIT(regs, reloc_func_desc);
1023 start_thread(regs, elf_entry, bprm->p);
1024 if (unlikely(current->ptrace & PT_PTRACED)) {
1025 if (current->ptrace & PT_TRACE_EXEC)
1026 ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
1028 send_sig(SIGTRAP, current, 0);
1038 allow_write_access(interpreter);
1042 kfree(elf_interpreter);
1044 sys_close(elf_exec_fileno);
1047 reset_files_struct(current, files);
1053 /* This is really simpleminded and specialized - we are loading an
1054 a.out library that is given an ELF header. */
1055 static int load_elf_library(struct file *file)
1057 struct elf_phdr *elf_phdata;
1058 struct elf_phdr *eppnt;
1059 unsigned long elf_bss, bss, len;
1060 int retval, error, i, j;
1061 struct elfhdr elf_ex;
1064 retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex));
1065 if (retval != sizeof(elf_ex))
1068 if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
1071 /* First of all, some simple consistency checks */
1072 if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
1073 !elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap)
1076 /* Now read in all of the header information */
1078 j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
1079 /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */
1082 elf_phdata = kmalloc(j, GFP_KERNEL);
1088 retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j);
1092 for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
1093 if ((eppnt + i)->p_type == PT_LOAD)
1098 while (eppnt->p_type != PT_LOAD)
1101 /* Now use mmap to map the library into memory. */
1102 down_write(¤t->mm->mmap_sem);
1103 error = do_mmap(file,
1104 ELF_PAGESTART(eppnt->p_vaddr),
1106 ELF_PAGEOFFSET(eppnt->p_vaddr)),
1107 PROT_READ | PROT_WRITE | PROT_EXEC,
1108 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
1110 ELF_PAGEOFFSET(eppnt->p_vaddr)));
1111 up_write(¤t->mm->mmap_sem);
1112 if (error != ELF_PAGESTART(eppnt->p_vaddr))
1115 elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
1116 if (padzero(elf_bss)) {
1121 len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr +
1123 bss = eppnt->p_memsz + eppnt->p_vaddr;
1125 down_write(¤t->mm->mmap_sem);
1126 do_brk(len, bss - len);
1127 up_write(¤t->mm->mmap_sem);
1138 * Note that some platforms still use traditional core dumps and not
1139 * the ELF core dump. Each platform can select it as appropriate.
1141 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
1146 * Modelled on fs/exec.c:aout_core_dump()
1147 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1150 * These are the only things you should do on a core-file: use only these
1151 * functions to write out all the necessary info.
1153 static int dump_write(struct file *file, const void *addr, int nr)
1155 return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
1158 static int dump_seek(struct file *file, loff_t off)
1160 if (file->f_op->llseek && file->f_op->llseek != no_llseek) {
1161 if (file->f_op->llseek(file, off, SEEK_CUR) < 0)
1164 char *buf = (char *)get_zeroed_page(GFP_KERNEL);
1168 unsigned long n = off;
1171 if (!dump_write(file, buf, n))
1175 free_page((unsigned long)buf);
1181 * Decide whether a segment is worth dumping; default is yes to be
1182 * sure (missing info is worse than too much; etc).
1183 * Personally I'd include everything, and use the coredump limit...
1185 * I think we should skip something. But I am not sure how. H.J.
1187 static int maydump(struct vm_area_struct *vma)
1189 /* Do not dump I/O mapped devices or special mappings */
1190 if (vma->vm_flags & (VM_IO | VM_RESERVED))
1193 /* Dump shared memory only if mapped from an anonymous file. */
1194 if (vma->vm_flags & VM_SHARED)
1195 return vma->vm_file->f_dentry->d_inode->i_nlink == 0;
1197 /* If it hasn't been written to, don't write it out */
1204 /* An ELF note in memory */
1209 unsigned int datasz;
1213 static int notesize(struct memelfnote *en)
1217 sz = sizeof(struct elf_note);
1218 sz += roundup(strlen(en->name) + 1, 4);
1219 sz += roundup(en->datasz, 4);
1224 #define DUMP_WRITE(addr, nr, foffset) \
1225 do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0)
1227 static int alignfile(struct file *file, loff_t *foffset)
1229 static const char buf[4] = { 0, };
1230 DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset);
1234 static int writenote(struct memelfnote *men, struct file *file,
1238 en.n_namesz = strlen(men->name) + 1;
1239 en.n_descsz = men->datasz;
1240 en.n_type = men->type;
1242 DUMP_WRITE(&en, sizeof(en), foffset);
1243 DUMP_WRITE(men->name, en.n_namesz, foffset);
1244 if (!alignfile(file, foffset))
1246 DUMP_WRITE(men->data, men->datasz, foffset);
1247 if (!alignfile(file, foffset))
1254 #define DUMP_WRITE(addr, nr) \
1255 if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
1257 #define DUMP_SEEK(off) \
1258 if (!dump_seek(file, (off))) \
1261 static void fill_elf_header(struct elfhdr *elf, int segs)
1263 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1264 elf->e_ident[EI_CLASS] = ELF_CLASS;
1265 elf->e_ident[EI_DATA] = ELF_DATA;
1266 elf->e_ident[EI_VERSION] = EV_CURRENT;
1267 elf->e_ident[EI_OSABI] = ELF_OSABI;
1268 memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
1270 elf->e_type = ET_CORE;
1271 elf->e_machine = ELF_ARCH;
1272 elf->e_version = EV_CURRENT;
1274 elf->e_phoff = sizeof(struct elfhdr);
1276 elf->e_flags = ELF_CORE_EFLAGS;
1277 elf->e_ehsize = sizeof(struct elfhdr);
1278 elf->e_phentsize = sizeof(struct elf_phdr);
1279 elf->e_phnum = segs;
1280 elf->e_shentsize = 0;
1282 elf->e_shstrndx = 0;
1286 static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1288 phdr->p_type = PT_NOTE;
1289 phdr->p_offset = offset;
1292 phdr->p_filesz = sz;
1299 static void fill_note(struct memelfnote *note, const char *name, int type,
1300 unsigned int sz, void *data)
1310 * fill up all the fields in prstatus from the given task struct, except
1311 * registers which need to be filled up separately.
1313 static void fill_prstatus(struct elf_prstatus *prstatus,
1314 struct task_struct *p, long signr)
1316 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1317 prstatus->pr_sigpend = p->pending.signal.sig[0];
1318 prstatus->pr_sighold = p->blocked.sig[0];
1319 prstatus->pr_pid = p->pid;
1320 prstatus->pr_ppid = p->parent->pid;
1321 prstatus->pr_pgrp = process_group(p);
1322 prstatus->pr_sid = p->signal->session;
1323 if (thread_group_leader(p)) {
1325 * This is the record for the group leader. Add in the
1326 * cumulative times of previous dead threads. This total
1327 * won't include the time of each live thread whose state
1328 * is included in the core dump. The final total reported
1329 * to our parent process when it calls wait4 will include
1330 * those sums as well as the little bit more time it takes
1331 * this and each other thread to finish dying after the
1332 * core dump synchronization phase.
1334 cputime_to_timeval(cputime_add(p->utime, p->signal->utime),
1335 &prstatus->pr_utime);
1336 cputime_to_timeval(cputime_add(p->stime, p->signal->stime),
1337 &prstatus->pr_stime);
1339 cputime_to_timeval(p->utime, &prstatus->pr_utime);
1340 cputime_to_timeval(p->stime, &prstatus->pr_stime);
1342 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1343 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1346 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1347 struct mm_struct *mm)
1349 unsigned int i, len;
1351 /* first copy the parameters from user space */
1352 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1354 len = mm->arg_end - mm->arg_start;
1355 if (len >= ELF_PRARGSZ)
1356 len = ELF_PRARGSZ-1;
1357 if (copy_from_user(&psinfo->pr_psargs,
1358 (const char __user *)mm->arg_start, len))
1360 for(i = 0; i < len; i++)
1361 if (psinfo->pr_psargs[i] == 0)
1362 psinfo->pr_psargs[i] = ' ';
1363 psinfo->pr_psargs[len] = 0;
1365 psinfo->pr_pid = p->pid;
1366 psinfo->pr_ppid = p->parent->pid;
1367 psinfo->pr_pgrp = process_group(p);
1368 psinfo->pr_sid = p->signal->session;
1370 i = p->state ? ffz(~p->state) + 1 : 0;
1371 psinfo->pr_state = i;
1372 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1373 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1374 psinfo->pr_nice = task_nice(p);
1375 psinfo->pr_flag = p->flags;
1376 SET_UID(psinfo->pr_uid, p->uid);
1377 SET_GID(psinfo->pr_gid, p->gid);
1378 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1383 /* Here is the structure in which status of each thread is captured. */
1384 struct elf_thread_status
1386 struct list_head list;
1387 struct elf_prstatus prstatus; /* NT_PRSTATUS */
1388 elf_fpregset_t fpu; /* NT_PRFPREG */
1389 struct task_struct *thread;
1390 #ifdef ELF_CORE_COPY_XFPREGS
1391 elf_fpxregset_t xfpu; /* NT_PRXFPREG */
1393 struct memelfnote notes[3];
1398 * In order to add the specific thread information for the elf file format,
1399 * we need to keep a linked list of every threads pr_status and then create
1400 * a single section for them in the final core file.
1402 static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1405 struct task_struct *p = t->thread;
1408 fill_prstatus(&t->prstatus, p, signr);
1409 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1411 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1414 sz += notesize(&t->notes[0]);
1416 if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL,
1418 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1421 sz += notesize(&t->notes[1]);
1424 #ifdef ELF_CORE_COPY_XFPREGS
1425 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1426 fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu),
1429 sz += notesize(&t->notes[2]);
1438 * This is a two-pass process; first we find the offsets of the bits,
1439 * and then they are actually written out. If we run out of core limit
1442 static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file)
1450 struct vm_area_struct *vma;
1451 struct elfhdr *elf = NULL;
1452 loff_t offset = 0, dataoff, foffset;
1453 unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
1455 struct memelfnote *notes = NULL;
1456 struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
1457 struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
1458 struct task_struct *g, *p;
1459 LIST_HEAD(thread_list);
1460 struct list_head *t;
1461 elf_fpregset_t *fpu = NULL;
1462 #ifdef ELF_CORE_COPY_XFPREGS
1463 elf_fpxregset_t *xfpu = NULL;
1465 int thread_status_size = 0;
1469 * We no longer stop all VM operations.
1471 * This is because those proceses that could possibly change map_count
1472 * or the mmap / vma pages are now blocked in do_exit on current
1473 * finishing this core dump.
1475 * Only ptrace can touch these memory addresses, but it doesn't change
1476 * the map_count or the pages allocated. So no possibility of crashing
1477 * exists while dumping the mm->vm_next areas to the core file.
1480 /* alloc memory for large data structures: too large to be on stack */
1481 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1484 prstatus = kmalloc(sizeof(*prstatus), GFP_KERNEL);
1487 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1490 notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
1493 fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
1496 #ifdef ELF_CORE_COPY_XFPREGS
1497 xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
1503 struct elf_thread_status *tmp;
1506 if (current->mm == p->mm && current != p) {
1507 tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC);
1513 list_add(&tmp->list, &thread_list);
1515 while_each_thread(g,p);
1517 list_for_each(t, &thread_list) {
1518 struct elf_thread_status *tmp;
1521 tmp = list_entry(t, struct elf_thread_status, list);
1522 sz = elf_dump_thread_status(signr, tmp);
1523 thread_status_size += sz;
1526 /* now collect the dump for the current */
1527 memset(prstatus, 0, sizeof(*prstatus));
1528 fill_prstatus(prstatus, current, signr);
1529 elf_core_copy_regs(&prstatus->pr_reg, regs);
1531 segs = current->mm->map_count;
1532 #ifdef ELF_CORE_EXTRA_PHDRS
1533 segs += ELF_CORE_EXTRA_PHDRS;
1537 fill_elf_header(elf, segs + 1); /* including notes section */
1540 current->flags |= PF_DUMPCORE;
1543 * Set up the notes in similar form to SVR4 core dumps made
1544 * with info from their /proc.
1547 fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
1548 fill_psinfo(psinfo, current->group_leader, current->mm);
1549 fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1553 auxv = (elf_addr_t *)current->mm->saved_auxv;
1558 while (auxv[i - 2] != AT_NULL);
1559 fill_note(¬es[numnote++], "CORE", NT_AUXV,
1560 i * sizeof(elf_addr_t), auxv);
1562 /* Try to dump the FPU. */
1563 if ((prstatus->pr_fpvalid =
1564 elf_core_copy_task_fpregs(current, regs, fpu)))
1565 fill_note(notes + numnote++,
1566 "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
1567 #ifdef ELF_CORE_COPY_XFPREGS
1568 if (elf_core_copy_task_xfpregs(current, xfpu))
1569 fill_note(notes + numnote++,
1570 "LINUX", NT_PRXFPREG, sizeof(*xfpu), xfpu);
1576 DUMP_WRITE(elf, sizeof(*elf));
1577 offset += sizeof(*elf); /* Elf header */
1578 offset += (segs + 1) * sizeof(struct elf_phdr); /* Program headers */
1581 /* Write notes phdr entry */
1583 struct elf_phdr phdr;
1586 for (i = 0; i < numnote; i++)
1587 sz += notesize(notes + i);
1589 sz += thread_status_size;
1591 #ifdef ELF_CORE_WRITE_EXTRA_NOTES
1592 sz += ELF_CORE_EXTRA_NOTES_SIZE;
1595 fill_elf_note_phdr(&phdr, sz, offset);
1597 DUMP_WRITE(&phdr, sizeof(phdr));
1600 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1602 /* Write program headers for segments dump */
1603 for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
1604 struct elf_phdr phdr;
1607 sz = vma->vm_end - vma->vm_start;
1609 phdr.p_type = PT_LOAD;
1610 phdr.p_offset = offset;
1611 phdr.p_vaddr = vma->vm_start;
1613 phdr.p_filesz = maydump(vma) ? sz : 0;
1615 offset += phdr.p_filesz;
1616 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
1617 if (vma->vm_flags & VM_WRITE)
1618 phdr.p_flags |= PF_W;
1619 if (vma->vm_flags & VM_EXEC)
1620 phdr.p_flags |= PF_X;
1621 phdr.p_align = ELF_EXEC_PAGESIZE;
1623 DUMP_WRITE(&phdr, sizeof(phdr));
1626 #ifdef ELF_CORE_WRITE_EXTRA_PHDRS
1627 ELF_CORE_WRITE_EXTRA_PHDRS;
1630 /* write out the notes section */
1631 for (i = 0; i < numnote; i++)
1632 if (!writenote(notes + i, file, &foffset))
1635 #ifdef ELF_CORE_WRITE_EXTRA_NOTES
1636 ELF_CORE_WRITE_EXTRA_NOTES;
1639 /* write out the thread status notes section */
1640 list_for_each(t, &thread_list) {
1641 struct elf_thread_status *tmp =
1642 list_entry(t, struct elf_thread_status, list);
1644 for (i = 0; i < tmp->num_notes; i++)
1645 if (!writenote(&tmp->notes[i], file, &foffset))
1650 DUMP_SEEK(dataoff - foffset);
1652 for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
1658 for (addr = vma->vm_start;
1660 addr += PAGE_SIZE) {
1662 struct vm_area_struct *vma;
1664 if (get_user_pages(current, current->mm, addr, 1, 0, 1,
1665 &page, &vma) <= 0) {
1666 DUMP_SEEK(PAGE_SIZE);
1668 if (page == ZERO_PAGE(addr)) {
1669 DUMP_SEEK(PAGE_SIZE);
1672 flush_cache_page(vma, addr,
1675 if ((size += PAGE_SIZE) > limit ||
1676 !dump_write(file, kaddr,
1679 page_cache_release(page);
1684 page_cache_release(page);
1689 #ifdef ELF_CORE_WRITE_EXTRA_DATA
1690 ELF_CORE_WRITE_EXTRA_DATA;
1697 while (!list_empty(&thread_list)) {
1698 struct list_head *tmp = thread_list.next;
1700 kfree(list_entry(tmp, struct elf_thread_status, list));
1708 #ifdef ELF_CORE_COPY_XFPREGS
1715 #endif /* USE_ELF_CORE_DUMP */
1717 static int __init init_elf_binfmt(void)
1719 return register_binfmt(&elf_format);
1722 static void __exit exit_elf_binfmt(void)
1724 /* Remove the COFF and ELF loaders. */
1725 unregister_binfmt(&elf_format);
1728 core_initcall(init_elf_binfmt);
1729 module_exit(exit_elf_binfmt);
1730 MODULE_LICENSE("GPL");