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/vs_memory.h>
43 #include <asm/uaccess.h>
44 #include <asm/param.h>
47 #include <linux/elf.h>
49 static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs);
50 static int load_elf_library(struct file*);
51 static unsigned long elf_map (struct file *, unsigned long, struct elf_phdr *, int, int);
52 extern int dump_fpu (struct pt_regs *, elf_fpregset_t *);
55 #define elf_addr_t unsigned long
59 * If we don't support core dumping, then supply a NULL so we
62 #ifdef USE_ELF_CORE_DUMP
63 static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file);
65 #define elf_core_dump NULL
68 #if ELF_EXEC_PAGESIZE > PAGE_SIZE
69 # define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE
71 # define ELF_MIN_ALIGN PAGE_SIZE
74 #ifndef ELF_CORE_EFLAGS
75 #define ELF_CORE_EFLAGS 0
78 #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
79 #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
80 #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
82 static struct linux_binfmt elf_format = {
83 .module = THIS_MODULE,
84 .load_binary = load_elf_binary,
85 .load_shlib = load_elf_library,
86 .core_dump = elf_core_dump,
87 .min_coredump = ELF_EXEC_PAGESIZE
90 #define BAD_ADDR(x) ((unsigned long)(x) > TASK_SIZE)
92 static int set_brk(unsigned long start, unsigned long end)
94 start = ELF_PAGEALIGN(start);
95 end = ELF_PAGEALIGN(end);
98 down_write(¤t->mm->mmap_sem);
99 addr = do_brk(start, end - start);
100 up_write(¤t->mm->mmap_sem);
104 current->mm->start_brk = current->mm->brk = end;
109 /* We need to explicitly zero any fractional pages
110 after the data section (i.e. bss). This would
111 contain the junk from the file that should not
115 static int padzero(unsigned long elf_bss)
119 nbyte = ELF_PAGEOFFSET(elf_bss);
121 nbyte = ELF_MIN_ALIGN - nbyte;
122 if (clear_user((void __user *) elf_bss, nbyte))
128 /* Let's use some macros to make this stack manipulation a litle clearer */
129 #ifdef CONFIG_STACK_GROWSUP
130 #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
131 #define STACK_ROUND(sp, items) \
132 ((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
133 #define STACK_ALLOC(sp, len) ({ elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; old_sp; })
135 #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
136 #define STACK_ROUND(sp, items) \
137 (((unsigned long) (sp - items)) &~ 15UL)
138 #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
142 create_elf_tables(struct linux_binprm *bprm, struct elfhdr * exec,
143 int interp_aout, unsigned long load_addr,
144 unsigned long interp_load_addr)
146 unsigned long p = bprm->p;
147 int argc = bprm->argc;
148 int envc = bprm->envc;
149 elf_addr_t __user *argv;
150 elf_addr_t __user *envp;
151 elf_addr_t __user *sp;
152 elf_addr_t __user *u_platform;
153 const char *k_platform = ELF_PLATFORM;
155 elf_addr_t *elf_info;
157 struct task_struct *tsk = current;
160 * If this architecture has a platform capability string, copy it
161 * to userspace. In some cases (Sparc), this info is impossible
162 * for userspace to get any other way, in others (i386) it is
168 size_t len = strlen(k_platform) + 1;
171 * In some cases (e.g. Hyper-Threading), we want to avoid L1
172 * evictions by the processes running on the same package. One
173 * thing we can do is to shuffle the initial stack for them.
176 p = arch_align_stack(p);
178 u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
179 if (__copy_to_user(u_platform, k_platform, len))
183 /* Create the ELF interpreter info */
184 elf_info = (elf_addr_t *) current->mm->saved_auxv;
185 #define NEW_AUX_ENT(id, val) \
186 do { elf_info[ei_index++] = id; elf_info[ei_index++] = val; } while (0)
190 * ARCH_DLINFO must come first so PPC can do its special alignment of
195 NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
196 NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE);
197 NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
198 NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff);
199 NEW_AUX_ENT(AT_PHENT, sizeof (struct elf_phdr));
200 NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
201 NEW_AUX_ENT(AT_BASE, interp_load_addr);
202 NEW_AUX_ENT(AT_FLAGS, 0);
203 NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
204 NEW_AUX_ENT(AT_UID, (elf_addr_t) tsk->uid);
205 NEW_AUX_ENT(AT_EUID, (elf_addr_t) tsk->euid);
206 NEW_AUX_ENT(AT_GID, (elf_addr_t) tsk->gid);
207 NEW_AUX_ENT(AT_EGID, (elf_addr_t) tsk->egid);
208 NEW_AUX_ENT(AT_SECURE, (elf_addr_t) security_bprm_secureexec(bprm));
210 NEW_AUX_ENT(AT_PLATFORM, (elf_addr_t)(unsigned long)u_platform);
212 if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
213 NEW_AUX_ENT(AT_EXECFD, (elf_addr_t) 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;
293 down_write(¤t->mm->mmap_sem);
294 map_addr = do_mmap(filep, ELF_PAGESTART(addr),
295 eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr), prot, type,
296 eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr));
297 up_write(¤t->mm->mmap_sem);
301 #endif /* !elf_map */
303 /* This is much more generalized than the library routine read function,
304 so we keep this separate. Technically the library read function
305 is only provided so that we can read a.out libraries that have
308 static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex,
309 struct file * interpreter,
310 unsigned long *interp_load_addr)
312 struct elf_phdr *elf_phdata;
313 struct elf_phdr *eppnt;
314 unsigned long load_addr = 0;
315 int load_addr_set = 0;
316 unsigned long last_bss = 0, elf_bss = 0;
317 unsigned long error = ~0UL;
320 /* First of all, some simple consistency checks */
321 if (interp_elf_ex->e_type != ET_EXEC &&
322 interp_elf_ex->e_type != ET_DYN)
324 if (!elf_check_arch(interp_elf_ex))
326 if (!interpreter->f_op || !interpreter->f_op->mmap)
330 * If the size of this structure has changed, then punt, since
331 * we will be doing the wrong thing.
333 if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr))
335 if (interp_elf_ex->e_phnum < 1 ||
336 interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr))
339 /* Now read in all of the header information */
341 size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum;
342 if (size > ELF_MIN_ALIGN)
344 elf_phdata = (struct elf_phdr *) kmalloc(size, GFP_KERNEL);
348 retval = kernel_read(interpreter,interp_elf_ex->e_phoff,(char *)elf_phdata,size);
350 if (retval != size) {
357 for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) {
358 if (eppnt->p_type == PT_LOAD) {
359 int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
361 unsigned long vaddr = 0;
362 unsigned long k, map_addr;
364 if (eppnt->p_flags & PF_R) elf_prot = PROT_READ;
365 if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
366 if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
367 vaddr = eppnt->p_vaddr;
368 if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
369 elf_type |= MAP_FIXED;
371 map_addr = elf_map(interpreter, load_addr + vaddr, eppnt, elf_prot, elf_type);
373 if (BAD_ADDR(map_addr))
376 if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) {
377 load_addr = map_addr - ELF_PAGESTART(vaddr);
382 * Check to see if the section's size will overflow the
383 * allowed task size. Note that p_filesz must always be
384 * <= p_memsize so it is only necessary to check p_memsz.
386 k = load_addr + eppnt->p_vaddr;
387 if (k > TASK_SIZE || eppnt->p_filesz > eppnt->p_memsz ||
388 eppnt->p_memsz > TASK_SIZE || TASK_SIZE - eppnt->p_memsz < k) {
394 * Find the end of the file mapping for this phdr, and keep
395 * track of the largest address we see for this.
397 k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
402 * Do the same thing for the memory mapping - between
403 * elf_bss and last_bss is the bss section.
405 k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
412 * Now fill out the bss section. First pad the last page up
413 * to the page boundary, and then perform a mmap to make sure
414 * that there are zero-mapped pages up to and including the
417 if (padzero(elf_bss)) {
422 elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1); /* What we have mapped so far */
424 /* Map the last of the bss segment */
425 if (last_bss > elf_bss) {
426 down_write(¤t->mm->mmap_sem);
427 error = do_brk(elf_bss, last_bss - elf_bss);
428 up_write(¤t->mm->mmap_sem);
433 *interp_load_addr = load_addr;
434 error = ((unsigned long) interp_elf_ex->e_entry) + load_addr;
442 static unsigned long load_aout_interp(struct exec * interp_ex,
443 struct file * interpreter)
445 unsigned long text_data, elf_entry = ~0UL;
449 current->mm->end_code = interp_ex->a_text;
450 text_data = interp_ex->a_text + interp_ex->a_data;
451 current->mm->end_data = text_data;
452 current->mm->brk = interp_ex->a_bss + text_data;
454 switch (N_MAGIC(*interp_ex)) {
457 addr = (char __user *)0;
461 offset = N_TXTOFF(*interp_ex);
462 addr = (char __user *) N_TXTADDR(*interp_ex);
468 down_write(¤t->mm->mmap_sem);
469 do_brk(0, text_data);
470 up_write(¤t->mm->mmap_sem);
471 if (!interpreter->f_op || !interpreter->f_op->read)
473 if (interpreter->f_op->read(interpreter, addr, text_data, &offset) < 0)
475 flush_icache_range((unsigned long)addr,
476 (unsigned long)addr + text_data);
479 down_write(¤t->mm->mmap_sem);
480 do_brk(ELF_PAGESTART(text_data + ELF_MIN_ALIGN - 1),
482 up_write(¤t->mm->mmap_sem);
483 elf_entry = interp_ex->a_entry;
490 * These are the functions used to load ELF style executables and shared
491 * libraries. There is no binary dependent code anywhere else.
494 #define INTERPRETER_NONE 0
495 #define INTERPRETER_AOUT 1
496 #define INTERPRETER_ELF 2
499 static unsigned long randomize_stack_top(unsigned long stack_top)
501 unsigned int random_variable = 0;
503 if (current->flags & PF_RANDOMIZE)
504 random_variable = get_random_int() % (8*1024*1024);
505 #ifdef CONFIG_STACK_GROWSUP
506 return PAGE_ALIGN(stack_top + random_variable);
508 return PAGE_ALIGN(stack_top - random_variable);
512 static int load_elf_binary(struct linux_binprm * bprm, struct pt_regs * regs)
514 struct file *interpreter = NULL; /* to shut gcc up */
515 unsigned long load_addr = 0, load_bias = 0;
516 int load_addr_set = 0;
517 char * elf_interpreter = NULL;
518 unsigned int interpreter_type = INTERPRETER_NONE;
519 unsigned char ibcs2_interpreter = 0;
521 struct elf_phdr * elf_ppnt, *elf_phdata;
522 unsigned long elf_bss, elf_brk;
526 unsigned long elf_entry, interp_load_addr = 0;
527 unsigned long start_code, end_code, start_data, end_data;
528 unsigned long reloc_func_desc = 0;
529 char passed_fileno[6];
530 struct files_struct *files;
531 int have_pt_gnu_stack, executable_stack = EXSTACK_DEFAULT;
532 unsigned long def_flags = 0;
534 struct elfhdr elf_ex;
535 struct elfhdr interp_elf_ex;
536 struct exec interp_ex;
539 loc = kmalloc(sizeof(*loc), GFP_KERNEL);
545 /* Get the exec-header */
546 loc->elf_ex = *((struct elfhdr *) bprm->buf);
549 /* First of all, some simple consistency checks */
550 if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
553 if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN)
555 if (!elf_check_arch(&loc->elf_ex))
557 if (!bprm->file->f_op||!bprm->file->f_op->mmap)
560 /* Now read in all of the header information */
562 if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr))
564 if (loc->elf_ex.e_phnum < 1 ||
565 loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr))
567 size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr);
569 elf_phdata = (struct elf_phdr *) kmalloc(size, GFP_KERNEL);
573 retval = kernel_read(bprm->file, loc->elf_ex.e_phoff, (char *) elf_phdata, size);
574 if (retval != size) {
580 files = current->files; /* Refcounted so ok */
581 retval = unshare_files();
584 if (files == current->files) {
585 put_files_struct(files);
589 /* exec will make our files private anyway, but for the a.out
590 loader stuff we need to do it earlier */
592 retval = get_unused_fd();
595 get_file(bprm->file);
596 fd_install(elf_exec_fileno = retval, bprm->file);
598 elf_ppnt = elf_phdata;
607 for (i = 0; i < loc->elf_ex.e_phnum; i++) {
608 if (elf_ppnt->p_type == PT_INTERP) {
609 /* This is the program interpreter used for
610 * shared libraries - for now assume that this
611 * is an a.out format binary
615 if (elf_ppnt->p_filesz > PATH_MAX ||
616 elf_ppnt->p_filesz < 2)
620 elf_interpreter = (char *) kmalloc(elf_ppnt->p_filesz,
622 if (!elf_interpreter)
625 retval = kernel_read(bprm->file, elf_ppnt->p_offset,
628 if (retval != elf_ppnt->p_filesz) {
631 goto out_free_interp;
633 /* make sure path is NULL terminated */
635 if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
636 goto out_free_interp;
638 /* If the program interpreter is one of these two,
639 * then assume an iBCS2 image. Otherwise assume
640 * a native linux image.
642 if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
643 strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0)
644 ibcs2_interpreter = 1;
647 * The early SET_PERSONALITY here is so that the lookup
648 * for the interpreter happens in the namespace of the
649 * to-be-execed image. SET_PERSONALITY can select an
652 * However, SET_PERSONALITY is NOT allowed to switch
653 * this task into the new images's memory mapping
654 * policy - that is, TASK_SIZE must still evaluate to
655 * that which is appropriate to the execing application.
656 * This is because exit_mmap() needs to have TASK_SIZE
657 * evaluate to the size of the old image.
659 * So if (say) a 64-bit application is execing a 32-bit
660 * application it is the architecture's responsibility
661 * to defer changing the value of TASK_SIZE until the
662 * switch really is going to happen - do this in
663 * flush_thread(). - akpm
665 SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
667 interpreter = open_exec(elf_interpreter);
668 retval = PTR_ERR(interpreter);
669 if (IS_ERR(interpreter))
670 goto out_free_interp;
671 retval = kernel_read(interpreter, 0, bprm->buf, BINPRM_BUF_SIZE);
672 if (retval != BINPRM_BUF_SIZE) {
675 goto out_free_dentry;
678 /* Get the exec headers */
679 loc->interp_ex = *((struct exec *) bprm->buf);
680 loc->interp_elf_ex = *((struct elfhdr *) bprm->buf);
686 elf_ppnt = elf_phdata;
687 for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++)
688 if (elf_ppnt->p_type == PT_GNU_STACK) {
689 if (elf_ppnt->p_flags & PF_X)
690 executable_stack = EXSTACK_ENABLE_X;
692 executable_stack = EXSTACK_DISABLE_X;
695 have_pt_gnu_stack = (i < loc->elf_ex.e_phnum);
697 /* Some simple consistency checks for the interpreter */
698 if (elf_interpreter) {
699 interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
701 /* Now figure out which format our binary is */
702 if ((N_MAGIC(loc->interp_ex) != OMAGIC) &&
703 (N_MAGIC(loc->interp_ex) != ZMAGIC) &&
704 (N_MAGIC(loc->interp_ex) != QMAGIC))
705 interpreter_type = INTERPRETER_ELF;
707 if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
708 interpreter_type &= ~INTERPRETER_ELF;
711 if (!interpreter_type)
712 goto out_free_dentry;
714 /* Make sure only one type was selected */
715 if ((interpreter_type & INTERPRETER_ELF) &&
716 interpreter_type != INTERPRETER_ELF) {
717 // FIXME - ratelimit this before re-enabling
718 // printk(KERN_WARNING "ELF: Ambiguous type, using ELF\n");
719 interpreter_type = INTERPRETER_ELF;
721 /* Verify the interpreter has a valid arch */
722 if ((interpreter_type == INTERPRETER_ELF) &&
723 !elf_check_arch(&loc->interp_elf_ex))
724 goto out_free_dentry;
726 /* Executables without an interpreter also need a personality */
727 SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
730 /* OK, we are done with that, now set up the arg stuff,
731 and then start this sucker up */
733 if ((!bprm->sh_bang) && (interpreter_type == INTERPRETER_AOUT)) {
734 char *passed_p = passed_fileno;
735 sprintf(passed_fileno, "%d", elf_exec_fileno);
737 if (elf_interpreter) {
738 retval = copy_strings_kernel(1, &passed_p, bprm);
740 goto out_free_dentry;
745 /* Flush all traces of the currently running executable */
746 retval = flush_old_exec(bprm);
748 goto out_free_dentry;
750 /* Discard our unneeded old files struct */
753 put_files_struct(files);
757 /* OK, This is the point of no return */
758 current->mm->start_data = 0;
759 current->mm->end_data = 0;
760 current->mm->end_code = 0;
761 current->mm->mmap = NULL;
762 current->flags &= ~PF_FORKNOEXEC;
763 current->mm->def_flags = def_flags;
765 /* Do this immediately, since STACK_TOP as used in setup_arg_pages
766 may depend on the personality. */
767 SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter);
768 if (elf_read_implies_exec(loc->elf_ex, executable_stack))
769 current->personality |= READ_IMPLIES_EXEC;
771 if ( !(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
772 current->flags |= PF_RANDOMIZE;
773 arch_pick_mmap_layout(current->mm);
775 /* Do this so that we can load the interpreter, if need be. We will
776 change some of these later */
777 set_mm_counter(current->mm, rss, 0);
778 current->mm->free_area_cache = current->mm->mmap_base;
779 retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP),
782 send_sig(SIGKILL, current, 0);
783 goto out_free_dentry;
786 current->mm->start_stack = bprm->p;
788 /* Now we do a little grungy work by mmaping the ELF image into
789 the correct location in memory. At this point, we assume that
790 the image should be loaded at fixed address, not at a variable
793 for(i = 0, elf_ppnt = elf_phdata; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
794 int elf_prot = 0, elf_flags;
795 unsigned long k, vaddr;
797 if (elf_ppnt->p_type != PT_LOAD)
800 if (unlikely (elf_brk > elf_bss)) {
803 /* There was a PT_LOAD segment with p_memsz > p_filesz
804 before this one. Map anonymous pages, if needed,
805 and clear the area. */
806 retval = set_brk (elf_bss + load_bias,
807 elf_brk + load_bias);
809 send_sig(SIGKILL, current, 0);
810 goto out_free_dentry;
812 nbyte = ELF_PAGEOFFSET(elf_bss);
814 nbyte = ELF_MIN_ALIGN - nbyte;
815 if (nbyte > elf_brk - elf_bss)
816 nbyte = elf_brk - elf_bss;
817 if (clear_user((void __user *)elf_bss +
820 * This bss-zeroing can fail if the ELF
821 * file specifies odd protections. So
822 * we don't check the return value
828 if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
829 if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
830 if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
832 elf_flags = MAP_PRIVATE|MAP_DENYWRITE|MAP_EXECUTABLE;
834 vaddr = elf_ppnt->p_vaddr;
835 if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
836 elf_flags |= MAP_FIXED;
837 } else if (loc->elf_ex.e_type == ET_DYN) {
838 /* Try and get dynamic programs out of the way of the default mmap
839 base, as well as whatever program they might try to exec. This
840 is because the brk will follow the loader, and is not movable. */
841 load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
844 error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, elf_prot, elf_flags);
845 if (BAD_ADDR(error)) {
846 send_sig(SIGKILL, current, 0);
847 goto out_free_dentry;
850 if (!load_addr_set) {
852 load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
853 if (loc->elf_ex.e_type == ET_DYN) {
855 ELF_PAGESTART(load_bias + vaddr);
856 load_addr += load_bias;
857 reloc_func_desc = load_bias;
860 k = elf_ppnt->p_vaddr;
861 if (k < start_code) start_code = k;
862 if (start_data < k) start_data = k;
865 * Check to see if the section's size will overflow the
866 * allowed task size. Note that p_filesz must always be
867 * <= p_memsz so it is only necessary to check p_memsz.
869 if (k > TASK_SIZE || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
870 elf_ppnt->p_memsz > TASK_SIZE ||
871 TASK_SIZE - elf_ppnt->p_memsz < k) {
872 /* set_brk can never work. Avoid overflows. */
873 send_sig(SIGKILL, current, 0);
874 goto out_free_dentry;
877 k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
881 if ((elf_ppnt->p_flags & PF_X) && end_code < k)
885 k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
890 loc->elf_ex.e_entry += load_bias;
891 elf_bss += load_bias;
892 elf_brk += load_bias;
893 start_code += load_bias;
894 end_code += load_bias;
895 start_data += load_bias;
896 end_data += load_bias;
898 /* Calling set_brk effectively mmaps the pages that we need
899 * for the bss and break sections. We must do this before
900 * mapping in the interpreter, to make sure it doesn't wind
901 * up getting placed where the bss needs to go.
903 retval = set_brk(elf_bss, elf_brk);
905 send_sig(SIGKILL, current, 0);
906 goto out_free_dentry;
908 if (padzero(elf_bss)) {
909 send_sig(SIGSEGV, current, 0);
910 retval = -EFAULT; /* Nobody gets to see this, but.. */
911 goto out_free_dentry;
914 if (elf_interpreter) {
915 if (interpreter_type == INTERPRETER_AOUT)
916 elf_entry = load_aout_interp(&loc->interp_ex,
919 elf_entry = load_elf_interp(&loc->interp_elf_ex,
922 if (BAD_ADDR(elf_entry)) {
923 printk(KERN_ERR "Unable to load interpreter %.128s\n",
925 force_sig(SIGSEGV, current);
926 retval = -ENOEXEC; /* Nobody gets to see this, but.. */
927 goto out_free_dentry;
929 reloc_func_desc = interp_load_addr;
931 allow_write_access(interpreter);
933 kfree(elf_interpreter);
935 elf_entry = loc->elf_ex.e_entry;
940 if (interpreter_type != INTERPRETER_AOUT)
941 sys_close(elf_exec_fileno);
943 set_binfmt(&elf_format);
945 #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
946 retval = arch_setup_additional_pages(bprm, executable_stack);
948 send_sig(SIGKILL, current, 0);
951 #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
954 current->flags &= ~PF_FORKNOEXEC;
955 create_elf_tables(bprm, &loc->elf_ex, (interpreter_type == INTERPRETER_AOUT),
956 load_addr, interp_load_addr);
957 /* N.B. passed_fileno might not be initialized? */
958 if (interpreter_type == INTERPRETER_AOUT)
959 current->mm->arg_start += strlen(passed_fileno) + 1;
960 current->mm->end_code = end_code;
961 current->mm->start_code = start_code;
962 current->mm->start_data = start_data;
963 current->mm->end_data = end_data;
964 current->mm->start_stack = bprm->p;
966 if (current->personality & MMAP_PAGE_ZERO) {
967 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
968 and some applications "depend" upon this behavior.
969 Since we do not have the power to recompile these, we
970 emulate the SVr4 behavior. Sigh. */
971 down_write(¤t->mm->mmap_sem);
972 error = do_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
973 MAP_FIXED | MAP_PRIVATE, 0);
974 up_write(¤t->mm->mmap_sem);
979 * The ABI may specify that certain registers be set up in special
980 * ways (on i386 %edx is the address of a DT_FINI function, for
981 * example. In addition, it may also specify (eg, PowerPC64 ELF)
982 * that the e_entry field is the address of the function descriptor
983 * for the startup routine, rather than the address of the startup
984 * routine itself. This macro performs whatever initialization to
985 * the regs structure is required as well as any relocations to the
986 * function descriptor entries when executing dynamically links apps.
988 ELF_PLAT_INIT(regs, reloc_func_desc);
991 start_thread(regs, elf_entry, bprm->p);
992 if (unlikely(current->ptrace & PT_PTRACED)) {
993 if (current->ptrace & PT_TRACE_EXEC)
994 ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
996 send_sig(SIGTRAP, current, 0);
1006 allow_write_access(interpreter);
1010 if (elf_interpreter)
1011 kfree(elf_interpreter);
1013 sys_close(elf_exec_fileno);
1016 put_files_struct(current->files);
1017 current->files = files;
1024 /* This is really simpleminded and specialized - we are loading an
1025 a.out library that is given an ELF header. */
1027 static int load_elf_library(struct file *file)
1029 struct elf_phdr *elf_phdata;
1030 struct elf_phdr *eppnt;
1031 unsigned long elf_bss, bss, len;
1032 int retval, error, i, j;
1033 struct elfhdr elf_ex;
1036 retval = kernel_read(file, 0, (char *) &elf_ex, sizeof(elf_ex));
1037 if (retval != sizeof(elf_ex))
1040 if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
1043 /* First of all, some simple consistency checks */
1044 if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
1045 !elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap)
1048 /* Now read in all of the header information */
1050 j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
1051 /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */
1054 elf_phdata = kmalloc(j, GFP_KERNEL);
1060 retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j);
1064 for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
1065 if ((eppnt + i)->p_type == PT_LOAD)
1070 while (eppnt->p_type != PT_LOAD)
1073 /* Now use mmap to map the library into memory. */
1074 down_write(¤t->mm->mmap_sem);
1075 error = do_mmap(file,
1076 ELF_PAGESTART(eppnt->p_vaddr),
1078 ELF_PAGEOFFSET(eppnt->p_vaddr)),
1079 PROT_READ | PROT_WRITE | PROT_EXEC,
1080 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
1082 ELF_PAGEOFFSET(eppnt->p_vaddr)));
1083 up_write(¤t->mm->mmap_sem);
1084 if (error != ELF_PAGESTART(eppnt->p_vaddr))
1087 elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
1088 if (padzero(elf_bss)) {
1093 len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + ELF_MIN_ALIGN - 1);
1094 bss = eppnt->p_memsz + eppnt->p_vaddr;
1096 down_write(¤t->mm->mmap_sem);
1097 do_brk(len, bss - len);
1098 up_write(¤t->mm->mmap_sem);
1109 * Note that some platforms still use traditional core dumps and not
1110 * the ELF core dump. Each platform can select it as appropriate.
1112 #ifdef USE_ELF_CORE_DUMP
1117 * Modelled on fs/exec.c:aout_core_dump()
1118 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1121 * These are the only things you should do on a core-file: use only these
1122 * functions to write out all the necessary info.
1124 static int dump_write(struct file *file, const void *addr, int nr)
1126 return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
1129 static int dump_seek(struct file *file, loff_t off)
1131 if (file->f_op->llseek) {
1132 if (file->f_op->llseek(file, off, 0) != off)
1140 * Decide whether a segment is worth dumping; default is yes to be
1141 * sure (missing info is worse than too much; etc).
1142 * Personally I'd include everything, and use the coredump limit...
1144 * I think we should skip something. But I am not sure how. H.J.
1146 static int maydump(struct vm_area_struct *vma)
1148 /* Do not dump I/O mapped devices or special mappings */
1149 if (vma->vm_flags & (VM_IO | VM_RESERVED))
1152 /* Dump shared memory only if mapped from an anonymous file. */
1153 if (vma->vm_flags & VM_SHARED)
1154 return vma->vm_file->f_dentry->d_inode->i_nlink == 0;
1156 /* If it hasn't been written to, don't write it out */
1163 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
1165 /* An ELF note in memory */
1170 unsigned int datasz;
1174 static int notesize(struct memelfnote *en)
1178 sz = sizeof(struct elf_note);
1179 sz += roundup(strlen(en->name) + 1, 4);
1180 sz += roundup(en->datasz, 4);
1185 #define DUMP_WRITE(addr, nr) \
1186 do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
1187 #define DUMP_SEEK(off) \
1188 do { if (!dump_seek(file, (off))) return 0; } while(0)
1190 static int writenote(struct memelfnote *men, struct file *file)
1194 en.n_namesz = strlen(men->name) + 1;
1195 en.n_descsz = men->datasz;
1196 en.n_type = men->type;
1198 DUMP_WRITE(&en, sizeof(en));
1199 DUMP_WRITE(men->name, en.n_namesz);
1200 /* XXX - cast from long long to long to avoid need for libgcc.a */
1201 DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */
1202 DUMP_WRITE(men->data, men->datasz);
1203 DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */
1210 #define DUMP_WRITE(addr, nr) \
1211 if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
1213 #define DUMP_SEEK(off) \
1214 if (!dump_seek(file, (off))) \
1217 static inline void fill_elf_header(struct elfhdr *elf, int segs)
1219 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1220 elf->e_ident[EI_CLASS] = ELF_CLASS;
1221 elf->e_ident[EI_DATA] = ELF_DATA;
1222 elf->e_ident[EI_VERSION] = EV_CURRENT;
1223 elf->e_ident[EI_OSABI] = ELF_OSABI;
1224 memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
1226 elf->e_type = ET_CORE;
1227 elf->e_machine = ELF_ARCH;
1228 elf->e_version = EV_CURRENT;
1230 elf->e_phoff = sizeof(struct elfhdr);
1232 elf->e_flags = ELF_CORE_EFLAGS;
1233 elf->e_ehsize = sizeof(struct elfhdr);
1234 elf->e_phentsize = sizeof(struct elf_phdr);
1235 elf->e_phnum = segs;
1236 elf->e_shentsize = 0;
1238 elf->e_shstrndx = 0;
1242 static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, off_t offset)
1244 phdr->p_type = PT_NOTE;
1245 phdr->p_offset = offset;
1248 phdr->p_filesz = sz;
1255 static void fill_note(struct memelfnote *note, const char *name, int type,
1256 unsigned int sz, void *data)
1266 * fill up all the fields in prstatus from the given task struct, except registers
1267 * which need to be filled up separately.
1269 static void fill_prstatus(struct elf_prstatus *prstatus,
1270 struct task_struct *p, long signr)
1272 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1273 prstatus->pr_sigpend = p->pending.signal.sig[0];
1274 prstatus->pr_sighold = p->blocked.sig[0];
1275 prstatus->pr_pid = p->pid;
1276 prstatus->pr_ppid = p->parent->pid;
1277 prstatus->pr_pgrp = process_group(p);
1278 prstatus->pr_sid = p->signal->session;
1279 if (thread_group_leader(p)) {
1281 * This is the record for the group leader. Add in the
1282 * cumulative times of previous dead threads. This total
1283 * won't include the time of each live thread whose state
1284 * is included in the core dump. The final total reported
1285 * to our parent process when it calls wait4 will include
1286 * those sums as well as the little bit more time it takes
1287 * this and each other thread to finish dying after the
1288 * core dump synchronization phase.
1290 cputime_to_timeval(cputime_add(p->utime, p->signal->utime),
1291 &prstatus->pr_utime);
1292 cputime_to_timeval(cputime_add(p->stime, p->signal->stime),
1293 &prstatus->pr_stime);
1295 cputime_to_timeval(p->utime, &prstatus->pr_utime);
1296 cputime_to_timeval(p->stime, &prstatus->pr_stime);
1298 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1299 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1302 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1303 struct mm_struct *mm)
1305 unsigned int i, len;
1307 /* first copy the parameters from user space */
1308 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1310 len = mm->arg_end - mm->arg_start;
1311 if (len >= ELF_PRARGSZ)
1312 len = ELF_PRARGSZ-1;
1313 if (copy_from_user(&psinfo->pr_psargs,
1314 (const char __user *)mm->arg_start, len))
1316 for(i = 0; i < len; i++)
1317 if (psinfo->pr_psargs[i] == 0)
1318 psinfo->pr_psargs[i] = ' ';
1319 psinfo->pr_psargs[len] = 0;
1321 psinfo->pr_pid = p->pid;
1322 psinfo->pr_ppid = p->parent->pid;
1323 psinfo->pr_pgrp = process_group(p);
1324 psinfo->pr_sid = p->signal->session;
1326 i = p->state ? ffz(~p->state) + 1 : 0;
1327 psinfo->pr_state = i;
1328 psinfo->pr_sname = (i < 0 || i > 5) ? '.' : "RSDTZW"[i];
1329 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1330 psinfo->pr_nice = task_nice(p);
1331 psinfo->pr_flag = p->flags;
1332 SET_UID(psinfo->pr_uid, p->uid);
1333 SET_GID(psinfo->pr_gid, p->gid);
1334 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1339 /* Here is the structure in which status of each thread is captured. */
1340 struct elf_thread_status
1342 struct list_head list;
1343 struct elf_prstatus prstatus; /* NT_PRSTATUS */
1344 elf_fpregset_t fpu; /* NT_PRFPREG */
1345 struct task_struct *thread;
1346 #ifdef ELF_CORE_COPY_XFPREGS
1347 elf_fpxregset_t xfpu; /* NT_PRXFPREG */
1349 struct memelfnote notes[3];
1354 * In order to add the specific thread information for the elf file format,
1355 * we need to keep a linked list of every threads pr_status and then
1356 * create a single section for them in the final core file.
1358 static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1361 struct task_struct *p = t->thread;
1364 fill_prstatus(&t->prstatus, p, signr);
1365 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1367 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), &(t->prstatus));
1369 sz += notesize(&t->notes[0]);
1371 if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu))) {
1372 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), &(t->fpu));
1374 sz += notesize(&t->notes[1]);
1377 #ifdef ELF_CORE_COPY_XFPREGS
1378 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1379 fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu), &t->xfpu);
1381 sz += notesize(&t->notes[2]);
1390 * This is a two-pass process; first we find the offsets of the bits,
1391 * and then they are actually written out. If we run out of core limit
1394 static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file)
1402 struct vm_area_struct *vma;
1403 struct elfhdr *elf = NULL;
1404 off_t offset = 0, dataoff;
1405 unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
1407 struct memelfnote *notes = NULL;
1408 struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
1409 struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
1410 struct task_struct *g, *p;
1411 LIST_HEAD(thread_list);
1412 struct list_head *t;
1413 elf_fpregset_t *fpu = NULL;
1414 #ifdef ELF_CORE_COPY_XFPREGS
1415 elf_fpxregset_t *xfpu = NULL;
1417 int thread_status_size = 0;
1421 * We no longer stop all VM operations.
1423 * This is because those proceses that could possibly change map_count or
1424 * the mmap / vma pages are now blocked in do_exit on current finishing
1427 * Only ptrace can touch these memory addresses, but it doesn't change
1428 * the map_count or the pages allocated. So no possibility of crashing
1429 * exists while dumping the mm->vm_next areas to the core file.
1432 /* alloc memory for large data structures: too large to be on stack */
1433 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1436 prstatus = kmalloc(sizeof(*prstatus), GFP_KERNEL);
1439 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1442 notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
1445 fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
1448 #ifdef ELF_CORE_COPY_XFPREGS
1449 xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
1455 struct elf_thread_status *tmp;
1456 read_lock(&tasklist_lock);
1458 if (current->mm == p->mm && current != p) {
1459 tmp = kmalloc(sizeof(*tmp), GFP_ATOMIC);
1461 read_unlock(&tasklist_lock);
1464 memset(tmp, 0, sizeof(*tmp));
1465 INIT_LIST_HEAD(&tmp->list);
1467 list_add(&tmp->list, &thread_list);
1469 while_each_thread(g,p);
1470 read_unlock(&tasklist_lock);
1471 list_for_each(t, &thread_list) {
1472 struct elf_thread_status *tmp;
1475 tmp = list_entry(t, struct elf_thread_status, list);
1476 sz = elf_dump_thread_status(signr, tmp);
1477 thread_status_size += sz;
1480 /* now collect the dump for the current */
1481 memset(prstatus, 0, sizeof(*prstatus));
1482 fill_prstatus(prstatus, current, signr);
1483 elf_core_copy_regs(&prstatus->pr_reg, regs);
1485 segs = current->mm->map_count;
1486 #ifdef ELF_CORE_EXTRA_PHDRS
1487 segs += ELF_CORE_EXTRA_PHDRS;
1491 fill_elf_header(elf, segs+1); /* including notes section */
1494 current->flags |= PF_DUMPCORE;
1497 * Set up the notes in similar form to SVR4 core dumps made
1498 * with info from their /proc.
1501 fill_note(notes +0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
1503 fill_psinfo(psinfo, current->group_leader, current->mm);
1504 fill_note(notes +1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1506 fill_note(notes +2, "CORE", NT_TASKSTRUCT, sizeof(*current), current);
1510 auxv = (elf_addr_t *) current->mm->saved_auxv;
1515 while (auxv[i - 2] != AT_NULL);
1516 fill_note(¬es[numnote++], "CORE", NT_AUXV,
1517 i * sizeof (elf_addr_t), auxv);
1519 /* Try to dump the FPU. */
1520 if ((prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs, fpu)))
1521 fill_note(notes + numnote++,
1522 "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
1523 #ifdef ELF_CORE_COPY_XFPREGS
1524 if (elf_core_copy_task_xfpregs(current, xfpu))
1525 fill_note(notes + numnote++,
1526 "LINUX", NT_PRXFPREG, sizeof(*xfpu), xfpu);
1532 DUMP_WRITE(elf, sizeof(*elf));
1533 offset += sizeof(*elf); /* Elf header */
1534 offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */
1536 /* Write notes phdr entry */
1538 struct elf_phdr phdr;
1541 for (i = 0; i < numnote; i++)
1542 sz += notesize(notes + i);
1544 sz += thread_status_size;
1546 fill_elf_note_phdr(&phdr, sz, offset);
1548 DUMP_WRITE(&phdr, sizeof(phdr));
1551 /* Page-align dumped data */
1552 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1554 /* Write program headers for segments dump */
1555 for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
1556 struct elf_phdr phdr;
1559 sz = vma->vm_end - vma->vm_start;
1561 phdr.p_type = PT_LOAD;
1562 phdr.p_offset = offset;
1563 phdr.p_vaddr = vma->vm_start;
1565 phdr.p_filesz = maydump(vma) ? sz : 0;
1567 offset += phdr.p_filesz;
1568 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
1569 if (vma->vm_flags & VM_WRITE) phdr.p_flags |= PF_W;
1570 if (vma->vm_flags & VM_EXEC) phdr.p_flags |= PF_X;
1571 phdr.p_align = ELF_EXEC_PAGESIZE;
1573 DUMP_WRITE(&phdr, sizeof(phdr));
1576 #ifdef ELF_CORE_WRITE_EXTRA_PHDRS
1577 ELF_CORE_WRITE_EXTRA_PHDRS;
1580 /* write out the notes section */
1581 for (i = 0; i < numnote; i++)
1582 if (!writenote(notes + i, file))
1585 /* write out the thread status notes section */
1586 list_for_each(t, &thread_list) {
1587 struct elf_thread_status *tmp = list_entry(t, struct elf_thread_status, list);
1588 for (i = 0; i < tmp->num_notes; i++)
1589 if (!writenote(&tmp->notes[i], file))
1595 for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
1601 for (addr = vma->vm_start;
1603 addr += PAGE_SIZE) {
1605 struct vm_area_struct *vma;
1607 if (get_user_pages(current, current->mm, addr, 1, 0, 1,
1608 &page, &vma) <= 0) {
1609 DUMP_SEEK (file->f_pos + PAGE_SIZE);
1611 if (page == ZERO_PAGE(addr)) {
1612 DUMP_SEEK (file->f_pos + PAGE_SIZE);
1615 flush_cache_page(vma, addr, page_to_pfn(page));
1617 if ((size += PAGE_SIZE) > limit ||
1618 !dump_write(file, kaddr,
1621 page_cache_release(page);
1626 page_cache_release(page);
1631 #ifdef ELF_CORE_WRITE_EXTRA_DATA
1632 ELF_CORE_WRITE_EXTRA_DATA;
1635 if ((off_t) file->f_pos != offset) {
1637 printk("elf_core_dump: file->f_pos (%ld) != offset (%ld)\n",
1638 (off_t) file->f_pos, offset);
1645 while(!list_empty(&thread_list)) {
1646 struct list_head *tmp = thread_list.next;
1648 kfree(list_entry(tmp, struct elf_thread_status, list));
1656 #ifdef ELF_CORE_COPY_XFPREGS
1663 #endif /* USE_ELF_CORE_DUMP */
1665 static int __init init_elf_binfmt(void)
1667 return register_binfmt(&elf_format);
1670 static void __exit exit_elf_binfmt(void)
1672 /* Remove the COFF and ELF loaders. */
1673 unregister_binfmt(&elf_format);
1676 core_initcall(init_elf_binfmt);
1677 module_exit(exit_elf_binfmt);
1678 MODULE_LICENSE("GPL");