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);
49 extern int dump_fpu (struct pt_regs *, elf_fpregset_t *);
52 #define elf_addr_t unsigned long
56 * If we don't support core dumping, then supply a NULL so we
59 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
60 static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file);
62 #define elf_core_dump NULL
65 #if ELF_EXEC_PAGESIZE > PAGE_SIZE
66 #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE
68 #define ELF_MIN_ALIGN PAGE_SIZE
71 #ifndef ELF_CORE_EFLAGS
72 #define ELF_CORE_EFLAGS 0
75 #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
76 #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
77 #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
79 static struct linux_binfmt elf_format = {
80 .module = THIS_MODULE,
81 .load_binary = load_elf_binary,
82 .load_shlib = load_elf_library,
83 .core_dump = elf_core_dump,
84 .min_coredump = ELF_EXEC_PAGESIZE
87 #define BAD_ADDR(x) ((unsigned long)(x) > TASK_SIZE)
89 static int set_brk(unsigned long start, unsigned long end)
91 start = ELF_PAGEALIGN(start);
92 end = ELF_PAGEALIGN(end);
95 down_write(¤t->mm->mmap_sem);
96 addr = do_brk(start, end - start);
97 up_write(¤t->mm->mmap_sem);
101 current->mm->start_brk = current->mm->brk = end;
105 /* We need to explicitly zero any fractional pages
106 after the data section (i.e. bss). This would
107 contain the junk from the file that should not
110 static int padzero(unsigned long elf_bss)
114 nbyte = ELF_PAGEOFFSET(elf_bss);
116 nbyte = ELF_MIN_ALIGN - nbyte;
117 if (clear_user((void __user *) elf_bss, nbyte))
123 /* Let's use some macros to make this stack manipulation a litle clearer */
124 #ifdef CONFIG_STACK_GROWSUP
125 #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
126 #define STACK_ROUND(sp, items) \
127 ((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
128 #define STACK_ALLOC(sp, len) ({ \
129 elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \
132 #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
133 #define STACK_ROUND(sp, items) \
134 (((unsigned long) (sp - items)) &~ 15UL)
135 #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
139 create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
140 int interp_aout, unsigned long load_addr,
141 unsigned long interp_load_addr)
143 unsigned long p = bprm->p;
144 int argc = bprm->argc;
145 int envc = bprm->envc;
146 elf_addr_t __user *argv;
147 elf_addr_t __user *envp;
148 elf_addr_t __user *sp;
149 elf_addr_t __user *u_platform;
150 const char *k_platform = ELF_PLATFORM;
152 elf_addr_t *elf_info;
154 struct task_struct *tsk = current;
157 * If this architecture has a platform capability string, copy it
158 * to userspace. In some cases (Sparc), this info is impossible
159 * for userspace to get any other way, in others (i386) it is
164 size_t len = strlen(k_platform) + 1;
167 * In some cases (e.g. Hyper-Threading), we want to avoid L1
168 * evictions by the processes running on the same package. One
169 * thing we can do is to shuffle the initial stack for them.
172 p = arch_align_stack(p);
174 u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
175 if (__copy_to_user(u_platform, k_platform, len))
179 /* Create the ELF interpreter info */
180 elf_info = (elf_addr_t *)current->mm->saved_auxv;
181 #define NEW_AUX_ENT(id, val) \
183 elf_info[ei_index++] = id; \
184 elf_info[ei_index++] = val; \
189 * ARCH_DLINFO must come first so PPC can do its special alignment of
194 NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
195 NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE);
196 NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
197 NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff);
198 NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
199 NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
200 NEW_AUX_ENT(AT_BASE, interp_load_addr);
201 NEW_AUX_ENT(AT_FLAGS, 0);
202 NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
203 NEW_AUX_ENT(AT_UID, tsk->uid);
204 NEW_AUX_ENT(AT_EUID, tsk->euid);
205 NEW_AUX_ENT(AT_GID, tsk->gid);
206 NEW_AUX_ENT(AT_EGID, tsk->egid);
207 NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
209 NEW_AUX_ENT(AT_PLATFORM,
210 (elf_addr_t)(unsigned long)u_platform);
212 if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
213 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
216 /* AT_NULL is zero; clear the rest too */
217 memset(&elf_info[ei_index], 0,
218 sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]);
220 /* And advance past the AT_NULL entry. */
223 sp = STACK_ADD(p, ei_index);
225 items = (argc + 1) + (envc + 1);
227 items += 3; /* a.out interpreters require argv & envp too */
229 items += 1; /* ELF interpreters only put argc on the stack */
231 bprm->p = STACK_ROUND(sp, items);
233 /* Point sp at the lowest address on the stack */
234 #ifdef CONFIG_STACK_GROWSUP
235 sp = (elf_addr_t __user *)bprm->p - items - ei_index;
236 bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */
238 sp = (elf_addr_t __user *)bprm->p;
241 /* Now, let's put argc (and argv, envp if appropriate) on the stack */
242 if (__put_user(argc, sp++))
246 envp = argv + argc + 1;
247 __put_user((elf_addr_t)(unsigned long)argv, sp++);
248 __put_user((elf_addr_t)(unsigned long)envp, sp++);
251 envp = argv + argc + 1;
254 /* Populate argv and envp */
255 p = current->mm->arg_end = current->mm->arg_start;
258 __put_user((elf_addr_t)p, argv++);
259 len = strnlen_user((void __user *)p, PAGE_SIZE*MAX_ARG_PAGES);
260 if (!len || len > PAGE_SIZE*MAX_ARG_PAGES)
264 if (__put_user(0, argv))
266 current->mm->arg_end = current->mm->env_start = p;
269 __put_user((elf_addr_t)p, envp++);
270 len = strnlen_user((void __user *)p, PAGE_SIZE*MAX_ARG_PAGES);
271 if (!len || len > PAGE_SIZE*MAX_ARG_PAGES)
275 if (__put_user(0, envp))
277 current->mm->env_end = p;
279 /* Put the elf_info on the stack in the right place. */
280 sp = (elf_addr_t __user *)envp + 1;
281 if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t)))
288 static unsigned long elf_map(struct file *filep, unsigned long addr,
289 struct elf_phdr *eppnt, int prot, int type)
291 unsigned long map_addr;
292 unsigned long pageoffset = ELF_PAGEOFFSET(eppnt->p_vaddr);
294 down_write(¤t->mm->mmap_sem);
295 /* mmap() will return -EINVAL if given a zero size, but a
296 * segment with zero filesize is perfectly valid */
297 if (eppnt->p_filesz + pageoffset)
298 map_addr = do_mmap(filep, ELF_PAGESTART(addr),
299 eppnt->p_filesz + pageoffset, prot, type,
300 eppnt->p_offset - pageoffset);
302 map_addr = ELF_PAGESTART(addr);
303 up_write(¤t->mm->mmap_sem);
307 #endif /* !elf_map */
309 /* This is much more generalized than the library routine read function,
310 so we keep this separate. Technically the library read function
311 is only provided so that we can read a.out libraries that have
314 static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
315 struct file *interpreter, unsigned long *interp_load_addr)
317 struct elf_phdr *elf_phdata;
318 struct elf_phdr *eppnt;
319 unsigned long load_addr = 0;
320 int load_addr_set = 0;
321 unsigned long last_bss = 0, elf_bss = 0;
322 unsigned long error = ~0UL;
325 /* First of all, some simple consistency checks */
326 if (interp_elf_ex->e_type != ET_EXEC &&
327 interp_elf_ex->e_type != ET_DYN)
329 if (!elf_check_arch(interp_elf_ex))
331 if (!interpreter->f_op || !interpreter->f_op->mmap)
335 * If the size of this structure has changed, then punt, since
336 * we will be doing the wrong thing.
338 if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr))
340 if (interp_elf_ex->e_phnum < 1 ||
341 interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr))
344 /* Now read in all of the header information */
345 size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum;
346 if (size > ELF_MIN_ALIGN)
348 elf_phdata = kmalloc(size, GFP_KERNEL);
352 retval = kernel_read(interpreter, interp_elf_ex->e_phoff,
353 (char *)elf_phdata,size);
355 if (retval != size) {
362 for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
363 if (eppnt->p_type == PT_LOAD) {
364 int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
366 unsigned long vaddr = 0;
367 unsigned long k, map_addr;
369 if (eppnt->p_flags & PF_R)
370 elf_prot = PROT_READ;
371 if (eppnt->p_flags & PF_W)
372 elf_prot |= PROT_WRITE;
373 if (eppnt->p_flags & PF_X)
374 elf_prot |= PROT_EXEC;
375 vaddr = eppnt->p_vaddr;
376 if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
377 elf_type |= MAP_FIXED;
379 map_addr = elf_map(interpreter, load_addr + vaddr,
380 eppnt, elf_prot, elf_type);
382 if (BAD_ADDR(map_addr))
385 if (!load_addr_set &&
386 interp_elf_ex->e_type == ET_DYN) {
387 load_addr = map_addr - ELF_PAGESTART(vaddr);
392 * Check to see if the section's size will overflow the
393 * allowed task size. Note that p_filesz must always be
394 * <= p_memsize so it's only necessary to check p_memsz.
396 k = load_addr + eppnt->p_vaddr;
398 eppnt->p_filesz > eppnt->p_memsz ||
399 eppnt->p_memsz > TASK_SIZE ||
400 TASK_SIZE - eppnt->p_memsz < k) {
406 * Find the end of the file mapping for this phdr, and
407 * keep track of the largest address we see for this.
409 k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
414 * Do the same thing for the memory mapping - between
415 * elf_bss and last_bss is the bss section.
417 k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
424 * Now fill out the bss section. First pad the last page up
425 * to the page boundary, and then perform a mmap to make sure
426 * that there are zero-mapped pages up to and including the
429 if (padzero(elf_bss)) {
434 /* What we have mapped so far */
435 elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1);
437 /* Map the last of the bss segment */
438 if (last_bss > elf_bss) {
439 down_write(¤t->mm->mmap_sem);
440 error = do_brk(elf_bss, last_bss - elf_bss);
441 up_write(¤t->mm->mmap_sem);
446 *interp_load_addr = load_addr;
447 error = ((unsigned long)interp_elf_ex->e_entry) + load_addr;
455 static unsigned long load_aout_interp(struct exec *interp_ex,
456 struct file *interpreter)
458 unsigned long text_data, elf_entry = ~0UL;
462 current->mm->end_code = interp_ex->a_text;
463 text_data = interp_ex->a_text + interp_ex->a_data;
464 current->mm->end_data = text_data;
465 current->mm->brk = interp_ex->a_bss + text_data;
467 switch (N_MAGIC(*interp_ex)) {
470 addr = (char __user *)0;
474 offset = N_TXTOFF(*interp_ex);
475 addr = (char __user *)N_TXTADDR(*interp_ex);
481 down_write(¤t->mm->mmap_sem);
482 do_brk(0, text_data);
483 up_write(¤t->mm->mmap_sem);
484 if (!interpreter->f_op || !interpreter->f_op->read)
486 if (interpreter->f_op->read(interpreter, addr, text_data, &offset) < 0)
488 flush_icache_range((unsigned long)addr,
489 (unsigned long)addr + text_data);
491 down_write(¤t->mm->mmap_sem);
492 do_brk(ELF_PAGESTART(text_data + ELF_MIN_ALIGN - 1),
494 up_write(¤t->mm->mmap_sem);
495 elf_entry = interp_ex->a_entry;
502 * These are the functions used to load ELF style executables and shared
503 * libraries. There is no binary dependent code anywhere else.
506 #define INTERPRETER_NONE 0
507 #define INTERPRETER_AOUT 1
508 #define INTERPRETER_ELF 2
510 #ifndef STACK_RND_MASK
511 #define STACK_RND_MASK 0x7ff /* with 4K pages 8MB of VA */
514 static unsigned long randomize_stack_top(unsigned long stack_top)
516 unsigned int random_variable = 0;
518 if (current->flags & PF_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 load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
862 error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
863 elf_prot, elf_flags);
864 if (BAD_ADDR(error)) {
865 send_sig(SIGKILL, current, 0);
866 goto out_free_dentry;
869 if (!load_addr_set) {
871 load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
872 if (loc->elf_ex.e_type == ET_DYN) {
874 ELF_PAGESTART(load_bias + vaddr);
875 load_addr += load_bias;
876 reloc_func_desc = load_bias;
879 k = elf_ppnt->p_vaddr;
886 * Check to see if the section's size will overflow the
887 * allowed task size. Note that p_filesz must always be
888 * <= p_memsz so it is only necessary to check p_memsz.
890 if (k > TASK_SIZE || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
891 elf_ppnt->p_memsz > TASK_SIZE ||
892 TASK_SIZE - elf_ppnt->p_memsz < k) {
893 /* set_brk can never work. Avoid overflows. */
894 send_sig(SIGKILL, current, 0);
895 goto out_free_dentry;
898 k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
902 if ((elf_ppnt->p_flags & PF_X) && end_code < k)
906 k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
911 loc->elf_ex.e_entry += load_bias;
912 elf_bss += load_bias;
913 elf_brk += load_bias;
914 start_code += load_bias;
915 end_code += load_bias;
916 start_data += load_bias;
917 end_data += load_bias;
919 /* Calling set_brk effectively mmaps the pages that we need
920 * for the bss and break sections. We must do this before
921 * mapping in the interpreter, to make sure it doesn't wind
922 * up getting placed where the bss needs to go.
924 retval = set_brk(elf_bss, elf_brk);
926 send_sig(SIGKILL, current, 0);
927 goto out_free_dentry;
929 if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) {
930 send_sig(SIGSEGV, current, 0);
931 retval = -EFAULT; /* Nobody gets to see this, but.. */
932 goto out_free_dentry;
935 if (elf_interpreter) {
936 if (interpreter_type == INTERPRETER_AOUT)
937 elf_entry = load_aout_interp(&loc->interp_ex,
940 elf_entry = load_elf_interp(&loc->interp_elf_ex,
943 if (BAD_ADDR(elf_entry)) {
944 printk(KERN_ERR "Unable to load interpreter %.128s\n",
946 force_sig(SIGSEGV, current);
947 retval = -ENOEXEC; /* Nobody gets to see this, but.. */
948 goto out_free_dentry;
950 reloc_func_desc = interp_load_addr;
952 allow_write_access(interpreter);
954 kfree(elf_interpreter);
956 elf_entry = loc->elf_ex.e_entry;
957 if (BAD_ADDR(elf_entry)) {
958 send_sig(SIGSEGV, current, 0);
959 retval = -ENOEXEC; /* Nobody gets to see this, but.. */
960 goto out_free_dentry;
966 if (interpreter_type != INTERPRETER_AOUT)
967 sys_close(elf_exec_fileno);
969 set_binfmt(&elf_format);
971 #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
972 retval = arch_setup_additional_pages(bprm, executable_stack);
974 send_sig(SIGKILL, current, 0);
977 #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
980 current->flags &= ~PF_FORKNOEXEC;
981 create_elf_tables(bprm, &loc->elf_ex,
982 (interpreter_type == INTERPRETER_AOUT),
983 load_addr, interp_load_addr);
984 /* N.B. passed_fileno might not be initialized? */
985 if (interpreter_type == INTERPRETER_AOUT)
986 current->mm->arg_start += strlen(passed_fileno) + 1;
987 current->mm->end_code = end_code;
988 current->mm->start_code = start_code;
989 current->mm->start_data = start_data;
990 current->mm->end_data = end_data;
991 current->mm->start_stack = bprm->p;
993 if (current->personality & MMAP_PAGE_ZERO) {
994 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
995 and some applications "depend" upon this behavior.
996 Since we do not have the power to recompile these, we
997 emulate the SVr4 behavior. Sigh. */
998 down_write(¤t->mm->mmap_sem);
999 error = do_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
1000 MAP_FIXED | MAP_PRIVATE, 0);
1001 up_write(¤t->mm->mmap_sem);
1004 #ifdef ELF_PLAT_INIT
1006 * The ABI may specify that certain registers be set up in special
1007 * ways (on i386 %edx is the address of a DT_FINI function, for
1008 * example. In addition, it may also specify (eg, PowerPC64 ELF)
1009 * that the e_entry field is the address of the function descriptor
1010 * for the startup routine, rather than the address of the startup
1011 * routine itself. This macro performs whatever initialization to
1012 * the regs structure is required as well as any relocations to the
1013 * function descriptor entries when executing dynamically links apps.
1015 ELF_PLAT_INIT(regs, reloc_func_desc);
1018 start_thread(regs, elf_entry, bprm->p);
1019 if (unlikely(current->ptrace & PT_PTRACED)) {
1020 if (current->ptrace & PT_TRACE_EXEC)
1021 ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
1023 send_sig(SIGTRAP, current, 0);
1033 allow_write_access(interpreter);
1037 kfree(elf_interpreter);
1039 sys_close(elf_exec_fileno);
1042 put_files_struct(current->files);
1043 current->files = files;
1050 /* This is really simpleminded and specialized - we are loading an
1051 a.out library that is given an ELF header. */
1052 static int load_elf_library(struct file *file)
1054 struct elf_phdr *elf_phdata;
1055 struct elf_phdr *eppnt;
1056 unsigned long elf_bss, bss, len;
1057 int retval, error, i, j;
1058 struct elfhdr elf_ex;
1061 retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex));
1062 if (retval != sizeof(elf_ex))
1065 if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
1068 /* First of all, some simple consistency checks */
1069 if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
1070 !elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap)
1073 /* Now read in all of the header information */
1075 j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
1076 /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */
1079 elf_phdata = kmalloc(j, GFP_KERNEL);
1085 retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j);
1089 for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
1090 if ((eppnt + i)->p_type == PT_LOAD)
1095 while (eppnt->p_type != PT_LOAD)
1098 /* Now use mmap to map the library into memory. */
1099 down_write(¤t->mm->mmap_sem);
1100 error = do_mmap(file,
1101 ELF_PAGESTART(eppnt->p_vaddr),
1103 ELF_PAGEOFFSET(eppnt->p_vaddr)),
1104 PROT_READ | PROT_WRITE | PROT_EXEC,
1105 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
1107 ELF_PAGEOFFSET(eppnt->p_vaddr)));
1108 up_write(¤t->mm->mmap_sem);
1109 if (error != ELF_PAGESTART(eppnt->p_vaddr))
1112 elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
1113 if (padzero(elf_bss)) {
1118 len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr +
1120 bss = eppnt->p_memsz + eppnt->p_vaddr;
1122 down_write(¤t->mm->mmap_sem);
1123 do_brk(len, bss - len);
1124 up_write(¤t->mm->mmap_sem);
1135 * Note that some platforms still use traditional core dumps and not
1136 * the ELF core dump. Each platform can select it as appropriate.
1138 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
1143 * Modelled on fs/exec.c:aout_core_dump()
1144 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1147 * These are the only things you should do on a core-file: use only these
1148 * functions to write out all the necessary info.
1150 static int dump_write(struct file *file, const void *addr, int nr)
1152 return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
1155 static int dump_seek(struct file *file, loff_t off)
1157 if (file->f_op->llseek) {
1158 if (file->f_op->llseek(file, off, 0) != off)
1166 * Decide whether a segment is worth dumping; default is yes to be
1167 * sure (missing info is worse than too much; etc).
1168 * Personally I'd include everything, and use the coredump limit...
1170 * I think we should skip something. But I am not sure how. H.J.
1172 static int maydump(struct vm_area_struct *vma)
1174 /* Do not dump I/O mapped devices or special mappings */
1175 if (vma->vm_flags & (VM_IO | VM_RESERVED))
1178 /* Dump shared memory only if mapped from an anonymous file. */
1179 if (vma->vm_flags & VM_SHARED)
1180 return vma->vm_file->f_dentry->d_inode->i_nlink == 0;
1182 /* If it hasn't been written to, don't write it out */
1189 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
1191 /* An ELF note in memory */
1196 unsigned int datasz;
1200 static int notesize(struct memelfnote *en)
1204 sz = sizeof(struct elf_note);
1205 sz += roundup(strlen(en->name) + 1, 4);
1206 sz += roundup(en->datasz, 4);
1211 #define DUMP_WRITE(addr, nr) \
1212 do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
1213 #define DUMP_SEEK(off) \
1214 do { if (!dump_seek(file, (off))) return 0; } while(0)
1216 static int writenote(struct memelfnote *men, struct file *file)
1220 en.n_namesz = strlen(men->name) + 1;
1221 en.n_descsz = men->datasz;
1222 en.n_type = men->type;
1224 DUMP_WRITE(&en, sizeof(en));
1225 DUMP_WRITE(men->name, en.n_namesz);
1226 /* XXX - cast from long long to long to avoid need for libgcc.a */
1227 DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */
1228 DUMP_WRITE(men->data, men->datasz);
1229 DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */
1236 #define DUMP_WRITE(addr, nr) \
1237 if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
1239 #define DUMP_SEEK(off) \
1240 if (!dump_seek(file, (off))) \
1243 static void fill_elf_header(struct elfhdr *elf, int segs)
1245 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1246 elf->e_ident[EI_CLASS] = ELF_CLASS;
1247 elf->e_ident[EI_DATA] = ELF_DATA;
1248 elf->e_ident[EI_VERSION] = EV_CURRENT;
1249 elf->e_ident[EI_OSABI] = ELF_OSABI;
1250 memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
1252 elf->e_type = ET_CORE;
1253 elf->e_machine = ELF_ARCH;
1254 elf->e_version = EV_CURRENT;
1256 elf->e_phoff = sizeof(struct elfhdr);
1258 elf->e_flags = ELF_CORE_EFLAGS;
1259 elf->e_ehsize = sizeof(struct elfhdr);
1260 elf->e_phentsize = sizeof(struct elf_phdr);
1261 elf->e_phnum = segs;
1262 elf->e_shentsize = 0;
1264 elf->e_shstrndx = 0;
1268 static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, off_t offset)
1270 phdr->p_type = PT_NOTE;
1271 phdr->p_offset = offset;
1274 phdr->p_filesz = sz;
1281 static void fill_note(struct memelfnote *note, const char *name, int type,
1282 unsigned int sz, void *data)
1292 * fill up all the fields in prstatus from the given task struct, except
1293 * registers which need to be filled up separately.
1295 static void fill_prstatus(struct elf_prstatus *prstatus,
1296 struct task_struct *p, long signr)
1298 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1299 prstatus->pr_sigpend = p->pending.signal.sig[0];
1300 prstatus->pr_sighold = p->blocked.sig[0];
1301 prstatus->pr_pid = p->pid;
1302 prstatus->pr_ppid = p->parent->pid;
1303 prstatus->pr_pgrp = process_group(p);
1304 prstatus->pr_sid = p->signal->session;
1305 if (thread_group_leader(p)) {
1307 * This is the record for the group leader. Add in the
1308 * cumulative times of previous dead threads. This total
1309 * won't include the time of each live thread whose state
1310 * is included in the core dump. The final total reported
1311 * to our parent process when it calls wait4 will include
1312 * those sums as well as the little bit more time it takes
1313 * this and each other thread to finish dying after the
1314 * core dump synchronization phase.
1316 cputime_to_timeval(cputime_add(p->utime, p->signal->utime),
1317 &prstatus->pr_utime);
1318 cputime_to_timeval(cputime_add(p->stime, p->signal->stime),
1319 &prstatus->pr_stime);
1321 cputime_to_timeval(p->utime, &prstatus->pr_utime);
1322 cputime_to_timeval(p->stime, &prstatus->pr_stime);
1324 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1325 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1328 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1329 struct mm_struct *mm)
1331 unsigned int i, len;
1333 /* first copy the parameters from user space */
1334 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1336 len = mm->arg_end - mm->arg_start;
1337 if (len >= ELF_PRARGSZ)
1338 len = ELF_PRARGSZ-1;
1339 if (copy_from_user(&psinfo->pr_psargs,
1340 (const char __user *)mm->arg_start, len))
1342 for(i = 0; i < len; i++)
1343 if (psinfo->pr_psargs[i] == 0)
1344 psinfo->pr_psargs[i] = ' ';
1345 psinfo->pr_psargs[len] = 0;
1347 psinfo->pr_pid = p->pid;
1348 psinfo->pr_ppid = p->parent->pid;
1349 psinfo->pr_pgrp = process_group(p);
1350 psinfo->pr_sid = p->signal->session;
1352 i = p->state ? ffz(~p->state) + 1 : 0;
1353 psinfo->pr_state = i;
1354 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1355 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1356 psinfo->pr_nice = task_nice(p);
1357 psinfo->pr_flag = p->flags;
1358 SET_UID(psinfo->pr_uid, p->uid);
1359 SET_GID(psinfo->pr_gid, p->gid);
1360 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1365 /* Here is the structure in which status of each thread is captured. */
1366 struct elf_thread_status
1368 struct list_head list;
1369 struct elf_prstatus prstatus; /* NT_PRSTATUS */
1370 elf_fpregset_t fpu; /* NT_PRFPREG */
1371 struct task_struct *thread;
1372 #ifdef ELF_CORE_COPY_XFPREGS
1373 elf_fpxregset_t xfpu; /* NT_PRXFPREG */
1375 struct memelfnote notes[3];
1380 * In order to add the specific thread information for the elf file format,
1381 * we need to keep a linked list of every threads pr_status and then create
1382 * a single section for them in the final core file.
1384 static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1387 struct task_struct *p = t->thread;
1390 fill_prstatus(&t->prstatus, p, signr);
1391 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1393 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1396 sz += notesize(&t->notes[0]);
1398 if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL,
1400 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1403 sz += notesize(&t->notes[1]);
1406 #ifdef ELF_CORE_COPY_XFPREGS
1407 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1408 fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu),
1411 sz += notesize(&t->notes[2]);
1420 * This is a two-pass process; first we find the offsets of the bits,
1421 * and then they are actually written out. If we run out of core limit
1424 static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file)
1432 struct vm_area_struct *vma;
1433 struct elfhdr *elf = NULL;
1434 off_t offset = 0, dataoff;
1435 unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
1437 struct memelfnote *notes = NULL;
1438 struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
1439 struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
1440 struct task_struct *g, *p;
1441 LIST_HEAD(thread_list);
1442 struct list_head *t;
1443 elf_fpregset_t *fpu = NULL;
1444 #ifdef ELF_CORE_COPY_XFPREGS
1445 elf_fpxregset_t *xfpu = NULL;
1447 int thread_status_size = 0;
1451 * We no longer stop all VM operations.
1453 * This is because those proceses that could possibly change map_count
1454 * or the mmap / vma pages are now blocked in do_exit on current
1455 * finishing this core dump.
1457 * Only ptrace can touch these memory addresses, but it doesn't change
1458 * the map_count or the pages allocated. So no possibility of crashing
1459 * exists while dumping the mm->vm_next areas to the core file.
1462 /* alloc memory for large data structures: too large to be on stack */
1463 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1466 prstatus = kmalloc(sizeof(*prstatus), GFP_KERNEL);
1469 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1472 notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
1475 fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
1478 #ifdef ELF_CORE_COPY_XFPREGS
1479 xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
1485 struct elf_thread_status *tmp;
1486 read_lock(&tasklist_lock);
1488 if (current->mm == p->mm && current != p) {
1489 tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC);
1491 read_unlock(&tasklist_lock);
1494 INIT_LIST_HEAD(&tmp->list);
1496 list_add(&tmp->list, &thread_list);
1498 while_each_thread(g,p);
1499 read_unlock(&tasklist_lock);
1500 list_for_each(t, &thread_list) {
1501 struct elf_thread_status *tmp;
1504 tmp = list_entry(t, struct elf_thread_status, list);
1505 sz = elf_dump_thread_status(signr, tmp);
1506 thread_status_size += sz;
1509 /* now collect the dump for the current */
1510 memset(prstatus, 0, sizeof(*prstatus));
1511 fill_prstatus(prstatus, current, signr);
1512 elf_core_copy_regs(&prstatus->pr_reg, regs);
1514 segs = current->mm->map_count;
1515 #ifdef ELF_CORE_EXTRA_PHDRS
1516 segs += ELF_CORE_EXTRA_PHDRS;
1520 fill_elf_header(elf, segs + 1); /* including notes section */
1523 current->flags |= PF_DUMPCORE;
1526 * Set up the notes in similar form to SVR4 core dumps made
1527 * with info from their /proc.
1530 fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
1531 fill_psinfo(psinfo, current->group_leader, current->mm);
1532 fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1536 auxv = (elf_addr_t *)current->mm->saved_auxv;
1541 while (auxv[i - 2] != AT_NULL);
1542 fill_note(¬es[numnote++], "CORE", NT_AUXV,
1543 i * sizeof(elf_addr_t), auxv);
1545 /* Try to dump the FPU. */
1546 if ((prstatus->pr_fpvalid =
1547 elf_core_copy_task_fpregs(current, regs, fpu)))
1548 fill_note(notes + numnote++,
1549 "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
1550 #ifdef ELF_CORE_COPY_XFPREGS
1551 if (elf_core_copy_task_xfpregs(current, xfpu))
1552 fill_note(notes + numnote++,
1553 "LINUX", NT_PRXFPREG, sizeof(*xfpu), xfpu);
1559 DUMP_WRITE(elf, sizeof(*elf));
1560 offset += sizeof(*elf); /* Elf header */
1561 offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */
1563 /* Write notes phdr entry */
1565 struct elf_phdr phdr;
1568 for (i = 0; i < numnote; i++)
1569 sz += notesize(notes + i);
1571 sz += thread_status_size;
1573 fill_elf_note_phdr(&phdr, sz, offset);
1575 DUMP_WRITE(&phdr, sizeof(phdr));
1578 /* Page-align dumped data */
1579 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1581 /* Write program headers for segments dump */
1582 for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
1583 struct elf_phdr phdr;
1586 sz = vma->vm_end - vma->vm_start;
1588 phdr.p_type = PT_LOAD;
1589 phdr.p_offset = offset;
1590 phdr.p_vaddr = vma->vm_start;
1592 phdr.p_filesz = maydump(vma) ? sz : 0;
1594 offset += phdr.p_filesz;
1595 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
1596 if (vma->vm_flags & VM_WRITE)
1597 phdr.p_flags |= PF_W;
1598 if (vma->vm_flags & VM_EXEC)
1599 phdr.p_flags |= PF_X;
1600 phdr.p_align = ELF_EXEC_PAGESIZE;
1602 DUMP_WRITE(&phdr, sizeof(phdr));
1605 #ifdef ELF_CORE_WRITE_EXTRA_PHDRS
1606 ELF_CORE_WRITE_EXTRA_PHDRS;
1609 /* write out the notes section */
1610 for (i = 0; i < numnote; i++)
1611 if (!writenote(notes + i, file))
1614 /* write out the thread status notes section */
1615 list_for_each(t, &thread_list) {
1616 struct elf_thread_status *tmp =
1617 list_entry(t, struct elf_thread_status, list);
1619 for (i = 0; i < tmp->num_notes; i++)
1620 if (!writenote(&tmp->notes[i], file))
1626 for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
1632 for (addr = vma->vm_start;
1634 addr += PAGE_SIZE) {
1636 struct vm_area_struct *vma;
1638 if (get_user_pages(current, current->mm, addr, 1, 0, 1,
1639 &page, &vma) <= 0) {
1640 DUMP_SEEK(file->f_pos + PAGE_SIZE);
1642 if (page == ZERO_PAGE(addr)) {
1643 DUMP_SEEK(file->f_pos + PAGE_SIZE);
1646 flush_cache_page(vma, addr,
1649 if ((size += PAGE_SIZE) > limit ||
1650 !dump_write(file, kaddr,
1653 page_cache_release(page);
1658 page_cache_release(page);
1663 #ifdef ELF_CORE_WRITE_EXTRA_DATA
1664 ELF_CORE_WRITE_EXTRA_DATA;
1667 if ((off_t)file->f_pos != offset) {
1670 "elf_core_dump: file->f_pos (%ld) != offset (%ld)\n",
1671 (off_t)file->f_pos, offset);
1678 while (!list_empty(&thread_list)) {
1679 struct list_head *tmp = thread_list.next;
1681 kfree(list_entry(tmp, struct elf_thread_status, list));
1689 #ifdef ELF_CORE_COPY_XFPREGS
1696 #endif /* USE_ELF_CORE_DUMP */
1698 static int __init init_elf_binfmt(void)
1700 return register_binfmt(&elf_format);
1703 static void __exit exit_elf_binfmt(void)
1705 /* Remove the COFF and ELF loaders. */
1706 unregister_binfmt(&elf_format);
1709 core_initcall(init_elf_binfmt);
1710 module_exit(exit_elf_binfmt);
1711 MODULE_LICENSE("GPL");