1 /* binfmt_elf_fdpic.c: FDPIC ELF binary format
3 * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 * Derived from binfmt_elf.c
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
13 #include <linux/module.h>
16 #include <linux/stat.h>
17 #include <linux/sched.h>
19 #include <linux/mman.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/slab.h>
27 #include <linux/pagemap.h>
28 #include <linux/security.h>
29 #include <linux/highmem.h>
30 #include <linux/highuid.h>
31 #include <linux/personality.h>
32 #include <linux/ptrace.h>
33 #include <linux/init.h>
34 #include <linux/elf.h>
35 #include <linux/elf-fdpic.h>
36 #include <linux/elfcore.h>
37 #include <linux/coredump.h>
39 #include <asm/uaccess.h>
40 #include <asm/param.h>
41 #include <asm/pgalloc.h>
43 typedef char *elf_caddr_t;
46 #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
48 #define kdebug(fmt, ...) do {} while(0)
52 #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
54 #define kdcore(fmt, ...) do {} while(0)
57 MODULE_LICENSE("GPL");
59 static int load_elf_fdpic_binary(struct linux_binprm *);
60 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *);
61 static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *,
62 struct mm_struct *, const char *);
64 static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *,
65 struct elf_fdpic_params *,
66 struct elf_fdpic_params *);
69 static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *,
71 static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *,
76 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
77 struct file *, struct mm_struct *);
79 #ifdef CONFIG_ELF_CORE
80 static int elf_fdpic_core_dump(struct coredump_params *cprm);
83 static struct linux_binfmt elf_fdpic_format = {
84 .module = THIS_MODULE,
85 .load_binary = load_elf_fdpic_binary,
86 #ifdef CONFIG_ELF_CORE
87 .core_dump = elf_fdpic_core_dump,
89 .min_coredump = ELF_EXEC_PAGESIZE,
92 static int __init init_elf_fdpic_binfmt(void)
94 register_binfmt(&elf_fdpic_format);
98 static void __exit exit_elf_fdpic_binfmt(void)
100 unregister_binfmt(&elf_fdpic_format);
103 core_initcall(init_elf_fdpic_binfmt);
104 module_exit(exit_elf_fdpic_binfmt);
106 static int is_elf(struct elfhdr *hdr, struct file *file)
108 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0)
110 if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)
112 if (!elf_check_arch(hdr))
114 if (!file->f_op->mmap)
119 #ifndef elf_check_fdpic
120 #define elf_check_fdpic(x) 0
123 #ifndef elf_check_const_displacement
124 #define elf_check_const_displacement(x) 0
127 static int is_constdisp(struct elfhdr *hdr)
129 if (!elf_check_fdpic(hdr))
131 if (elf_check_const_displacement(hdr))
136 /*****************************************************************************/
138 * read the program headers table into memory
140 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,
143 struct elf32_phdr *phdr;
147 if (params->hdr.e_phentsize != sizeof(struct elf_phdr))
149 if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr))
152 size = params->hdr.e_phnum * sizeof(struct elf_phdr);
153 params->phdrs = kmalloc(size, GFP_KERNEL);
157 retval = kernel_read(file, params->hdr.e_phoff,
158 (char *) params->phdrs, size);
159 if (unlikely(retval != size))
160 return retval < 0 ? retval : -ENOEXEC;
162 /* determine stack size for this binary */
163 phdr = params->phdrs;
164 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
165 if (phdr->p_type != PT_GNU_STACK)
168 if (phdr->p_flags & PF_X)
169 params->flags |= ELF_FDPIC_FLAG_EXEC_STACK;
171 params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK;
173 params->stack_size = phdr->p_memsz;
180 /*****************************************************************************/
182 * load an fdpic binary into various bits of memory
184 static int load_elf_fdpic_binary(struct linux_binprm *bprm)
186 struct elf_fdpic_params exec_params, interp_params;
187 struct pt_regs *regs = current_pt_regs();
188 struct elf_phdr *phdr;
189 unsigned long stack_size, entryaddr;
190 #ifdef ELF_FDPIC_PLAT_INIT
191 unsigned long dynaddr;
194 unsigned long stack_prot;
196 struct file *interpreter = NULL; /* to shut gcc up */
197 char *interpreter_name = NULL;
198 int executable_stack;
201 kdebug("____ LOAD %d ____", current->pid);
203 memset(&exec_params, 0, sizeof(exec_params));
204 memset(&interp_params, 0, sizeof(interp_params));
206 exec_params.hdr = *(struct elfhdr *) bprm->buf;
207 exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE;
209 /* check that this is a binary we know how to deal with */
211 if (!is_elf(&exec_params.hdr, bprm->file))
213 if (!elf_check_fdpic(&exec_params.hdr)) {
215 /* binfmt_elf handles non-fdpic elf except on nommu */
218 /* nommu can only load ET_DYN (PIE) ELF */
219 if (exec_params.hdr.e_type != ET_DYN)
224 /* read the program header table */
225 retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file);
229 /* scan for a program header that specifies an interpreter */
230 phdr = exec_params.phdrs;
232 for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) {
233 switch (phdr->p_type) {
236 if (phdr->p_filesz > PATH_MAX)
239 if (phdr->p_filesz < 2)
242 /* read the name of the interpreter into memory */
243 interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL);
244 if (!interpreter_name)
247 retval = kernel_read(bprm->file,
251 if (unlikely(retval != phdr->p_filesz)) {
258 if (interpreter_name[phdr->p_filesz - 1] != '\0')
261 kdebug("Using ELF interpreter %s", interpreter_name);
263 /* replace the program with the interpreter */
264 interpreter = open_exec(interpreter_name);
265 retval = PTR_ERR(interpreter);
266 if (IS_ERR(interpreter)) {
272 * If the binary is not readable then enforce
273 * mm->dumpable = 0 regardless of the interpreter's
276 would_dump(bprm, interpreter);
278 retval = kernel_read(interpreter, 0, bprm->buf,
280 if (unlikely(retval != BINPRM_BUF_SIZE)) {
286 interp_params.hdr = *((struct elfhdr *) bprm->buf);
291 if (exec_params.load_addr == 0)
292 exec_params.load_addr = phdr->p_vaddr;
299 if (is_constdisp(&exec_params.hdr))
300 exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
302 /* perform insanity checks on the interpreter */
303 if (interpreter_name) {
305 if (!is_elf(&interp_params.hdr, interpreter))
308 interp_params.flags = ELF_FDPIC_FLAG_PRESENT;
310 /* read the interpreter's program header table */
311 retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter);
316 stack_size = exec_params.stack_size;
317 if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
318 executable_stack = EXSTACK_ENABLE_X;
319 else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
320 executable_stack = EXSTACK_DISABLE_X;
322 executable_stack = EXSTACK_DEFAULT;
324 if (stack_size == 0) {
325 stack_size = interp_params.stack_size;
326 if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
327 executable_stack = EXSTACK_ENABLE_X;
328 else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
329 executable_stack = EXSTACK_DISABLE_X;
331 executable_stack = EXSTACK_DEFAULT;
336 stack_size = 131072UL; /* same as exec.c's default commit */
338 if (is_constdisp(&interp_params.hdr))
339 interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
341 /* flush all traces of the currently running executable */
342 retval = flush_old_exec(bprm);
346 /* there's now no turning back... the old userspace image is dead,
347 * defunct, deceased, etc.
349 if (elf_check_fdpic(&exec_params.hdr))
350 set_personality(PER_LINUX_FDPIC);
352 set_personality(PER_LINUX);
353 if (elf_read_implies_exec(&exec_params.hdr, executable_stack))
354 current->personality |= READ_IMPLIES_EXEC;
356 setup_new_exec(bprm);
358 set_binfmt(&elf_fdpic_format);
360 current->mm->start_code = 0;
361 current->mm->end_code = 0;
362 current->mm->start_stack = 0;
363 current->mm->start_data = 0;
364 current->mm->end_data = 0;
365 current->mm->context.exec_fdpic_loadmap = 0;
366 current->mm->context.interp_fdpic_loadmap = 0;
369 elf_fdpic_arch_lay_out_mm(&exec_params,
371 ¤t->mm->start_stack,
372 ¤t->mm->start_brk);
374 retval = setup_arg_pages(bprm, current->mm->start_stack,
380 /* load the executable and interpreter into memory */
381 retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm,
386 if (interpreter_name) {
387 retval = elf_fdpic_map_file(&interp_params, interpreter,
388 current->mm, "interpreter");
390 printk(KERN_ERR "Unable to load interpreter\n");
394 allow_write_access(interpreter);
400 if (!current->mm->start_brk)
401 current->mm->start_brk = current->mm->end_data;
403 current->mm->brk = current->mm->start_brk =
404 PAGE_ALIGN(current->mm->start_brk);
407 /* create a stack and brk area big enough for everyone
408 * - the brk heap starts at the bottom and works up
409 * - the stack starts at the top and works down
411 stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK;
412 if (stack_size < PAGE_SIZE * 2)
413 stack_size = PAGE_SIZE * 2;
415 stack_prot = PROT_READ | PROT_WRITE;
416 if (executable_stack == EXSTACK_ENABLE_X ||
417 (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC))
418 stack_prot |= PROT_EXEC;
420 current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot,
421 MAP_PRIVATE | MAP_ANONYMOUS |
422 MAP_UNINITIALIZED | MAP_GROWSDOWN,
425 if (IS_ERR_VALUE(current->mm->start_brk)) {
426 retval = current->mm->start_brk;
427 current->mm->start_brk = 0;
431 current->mm->brk = current->mm->start_brk;
432 current->mm->context.end_brk = current->mm->start_brk;
433 current->mm->context.end_brk +=
434 (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0;
435 current->mm->start_stack = current->mm->start_brk + stack_size;
438 install_exec_creds(bprm);
439 if (create_elf_fdpic_tables(bprm, current->mm,
440 &exec_params, &interp_params) < 0)
443 kdebug("- start_code %lx", current->mm->start_code);
444 kdebug("- end_code %lx", current->mm->end_code);
445 kdebug("- start_data %lx", current->mm->start_data);
446 kdebug("- end_data %lx", current->mm->end_data);
447 kdebug("- start_brk %lx", current->mm->start_brk);
448 kdebug("- brk %lx", current->mm->brk);
449 kdebug("- start_stack %lx", current->mm->start_stack);
451 #ifdef ELF_FDPIC_PLAT_INIT
453 * The ABI may specify that certain registers be set up in special
454 * ways (on i386 %edx is the address of a DT_FINI function, for
455 * example. This macro performs whatever initialization to
456 * the regs structure is required.
458 dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr;
459 ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr,
463 /* everything is now ready... get the userspace context ready to roll */
464 entryaddr = interp_params.entry_addr ?: exec_params.entry_addr;
465 start_thread(regs, entryaddr, current->mm->start_stack);
471 allow_write_access(interpreter);
474 kfree(interpreter_name);
475 kfree(exec_params.phdrs);
476 kfree(exec_params.loadmap);
477 kfree(interp_params.phdrs);
478 kfree(interp_params.loadmap);
482 /*****************************************************************************/
484 #ifndef ELF_BASE_PLATFORM
486 * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
487 * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
488 * will be copied to the user stack in the same manner as AT_PLATFORM.
490 #define ELF_BASE_PLATFORM NULL
494 * present useful information to the program by shovelling it onto the new
497 static int create_elf_fdpic_tables(struct linux_binprm *bprm,
498 struct mm_struct *mm,
499 struct elf_fdpic_params *exec_params,
500 struct elf_fdpic_params *interp_params)
502 const struct cred *cred = current_cred();
503 unsigned long sp, csp, nitems;
504 elf_caddr_t __user *argv, *envp;
505 size_t platform_len = 0, len;
506 char *k_platform, *k_base_platform;
507 char __user *u_platform, *u_base_platform, *p;
509 int nr; /* reset for each csp adjustment */
512 /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions
513 * by the processes running on the same package. One thing we can do is
514 * to shuffle the initial stack for them, so we give the architecture
515 * an opportunity to do so here.
517 sp = arch_align_stack(bprm->p);
519 sp = mm->start_stack;
521 /* stack the program arguments and environment */
522 if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0)
527 * If this architecture has a platform capability string, copy it
528 * to userspace. In some cases (Sparc), this info is impossible
529 * for userspace to get any other way, in others (i386) it is
532 k_platform = ELF_PLATFORM;
536 platform_len = strlen(k_platform) + 1;
538 u_platform = (char __user *) sp;
539 if (__copy_to_user(u_platform, k_platform, platform_len) != 0)
544 * If this architecture has a "base" platform capability
545 * string, copy it to userspace.
547 k_base_platform = ELF_BASE_PLATFORM;
548 u_base_platform = NULL;
550 if (k_base_platform) {
551 platform_len = strlen(k_base_platform) + 1;
553 u_base_platform = (char __user *) sp;
554 if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0)
560 /* stack the load map(s) */
561 len = sizeof(struct elf32_fdpic_loadmap);
562 len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs;
563 sp = (sp - len) & ~7UL;
564 exec_params->map_addr = sp;
566 if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0)
569 current->mm->context.exec_fdpic_loadmap = (unsigned long) sp;
571 if (interp_params->loadmap) {
572 len = sizeof(struct elf32_fdpic_loadmap);
573 len += sizeof(struct elf32_fdpic_loadseg) *
574 interp_params->loadmap->nsegs;
575 sp = (sp - len) & ~7UL;
576 interp_params->map_addr = sp;
578 if (copy_to_user((void __user *) sp, interp_params->loadmap,
582 current->mm->context.interp_fdpic_loadmap = (unsigned long) sp;
585 /* force 16 byte _final_ alignment here for generality */
586 #define DLINFO_ITEMS 15
588 nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) +
589 (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH;
591 if (bprm->interp_flags & BINPRM_FLAGS_EXECFD)
595 sp -= nitems * 2 * sizeof(unsigned long);
596 sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */
597 sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */
598 sp -= 1 * sizeof(unsigned long); /* argc */
603 /* put the ELF interpreter info on the stack */
604 #define NEW_AUX_ENT(id, val) \
606 struct { unsigned long _id, _val; } __user *ent; \
608 ent = (void __user *) csp; \
609 __put_user((id), &ent[nr]._id); \
610 __put_user((val), &ent[nr]._val); \
615 csp -= 2 * sizeof(unsigned long);
616 NEW_AUX_ENT(AT_NULL, 0);
619 csp -= 2 * sizeof(unsigned long);
620 NEW_AUX_ENT(AT_PLATFORM,
621 (elf_addr_t) (unsigned long) u_platform);
624 if (k_base_platform) {
626 csp -= 2 * sizeof(unsigned long);
627 NEW_AUX_ENT(AT_BASE_PLATFORM,
628 (elf_addr_t) (unsigned long) u_base_platform);
631 if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
633 csp -= 2 * sizeof(unsigned long);
634 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
638 csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long);
639 NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
641 NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);
643 NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE);
644 NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
645 NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr);
646 NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
647 NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum);
648 NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr);
649 NEW_AUX_ENT(AT_FLAGS, 0);
650 NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr);
651 NEW_AUX_ENT(AT_UID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid));
652 NEW_AUX_ENT(AT_EUID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid));
653 NEW_AUX_ENT(AT_GID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid));
654 NEW_AUX_ENT(AT_EGID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid));
655 NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
656 NEW_AUX_ENT(AT_EXECFN, bprm->exec);
660 csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long);
662 /* ARCH_DLINFO must come last so platform specific code can enforce
663 * special alignment requirements on the AUXV if necessary (eg. PPC).
669 /* allocate room for argv[] and envv[] */
670 csp -= (bprm->envc + 1) * sizeof(elf_caddr_t);
671 envp = (elf_caddr_t __user *) csp;
672 csp -= (bprm->argc + 1) * sizeof(elf_caddr_t);
673 argv = (elf_caddr_t __user *) csp;
676 csp -= sizeof(unsigned long);
677 __put_user(bprm->argc, (unsigned long __user *) csp);
681 /* fill in the argv[] array */
683 current->mm->arg_start = bprm->p;
685 current->mm->arg_start = current->mm->start_stack -
686 (MAX_ARG_PAGES * PAGE_SIZE - bprm->p);
689 p = (char __user *) current->mm->arg_start;
690 for (loop = bprm->argc; loop > 0; loop--) {
691 __put_user((elf_caddr_t) p, argv++);
692 len = strnlen_user(p, MAX_ARG_STRLEN);
693 if (!len || len > MAX_ARG_STRLEN)
697 __put_user(NULL, argv);
698 current->mm->arg_end = (unsigned long) p;
700 /* fill in the envv[] array */
701 current->mm->env_start = (unsigned long) p;
702 for (loop = bprm->envc; loop > 0; loop--) {
703 __put_user((elf_caddr_t)(unsigned long) p, envp++);
704 len = strnlen_user(p, MAX_ARG_STRLEN);
705 if (!len || len > MAX_ARG_STRLEN)
709 __put_user(NULL, envp);
710 current->mm->env_end = (unsigned long) p;
712 mm->start_stack = (unsigned long) sp;
716 /*****************************************************************************/
718 * transfer the program arguments and environment from the holding pages onto
722 static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm,
725 unsigned long index, stop, sp;
729 stop = bprm->p >> PAGE_SHIFT;
732 for (index = MAX_ARG_PAGES - 1; index >= stop; index--) {
733 src = kmap(bprm->page[index]);
735 if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0)
737 kunmap(bprm->page[index]);
742 *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15;
749 /*****************************************************************************/
751 * load the appropriate binary image (executable or interpreter) into memory
752 * - we assume no MMU is available
753 * - if no other PIC bits are set in params->hdr->e_flags
754 * - we assume that the LOADable segments in the binary are independently relocatable
755 * - we assume R/O executable segments are shareable
757 * - we assume the loadable parts of the image to require fixed displacement
758 * - the image is not shareable
760 static int elf_fdpic_map_file(struct elf_fdpic_params *params,
762 struct mm_struct *mm,
765 struct elf32_fdpic_loadmap *loadmap;
767 struct elf32_fdpic_loadseg *mseg;
769 struct elf32_fdpic_loadseg *seg;
770 struct elf32_phdr *phdr;
771 unsigned long load_addr, stop;
772 unsigned nloads, tmp;
776 /* allocate a load map table */
778 for (loop = 0; loop < params->hdr.e_phnum; loop++)
779 if (params->phdrs[loop].p_type == PT_LOAD)
785 size = sizeof(*loadmap) + nloads * sizeof(*seg);
786 loadmap = kzalloc(size, GFP_KERNEL);
790 params->loadmap = loadmap;
792 loadmap->version = ELF32_FDPIC_LOADMAP_VERSION;
793 loadmap->nsegs = nloads;
795 load_addr = params->load_addr;
798 /* map the requested LOADs into the memory space */
799 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
800 case ELF_FDPIC_FLAG_CONSTDISP:
801 case ELF_FDPIC_FLAG_CONTIGUOUS:
803 ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm);
809 ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm);
815 /* map the entry point */
816 if (params->hdr.e_entry) {
818 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
819 if (params->hdr.e_entry >= seg->p_vaddr &&
820 params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) {
822 (params->hdr.e_entry - seg->p_vaddr) +
829 /* determine where the program header table has wound up if mapped */
830 stop = params->hdr.e_phoff;
831 stop += params->hdr.e_phnum * sizeof (struct elf_phdr);
832 phdr = params->phdrs;
834 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
835 if (phdr->p_type != PT_LOAD)
838 if (phdr->p_offset > params->hdr.e_phoff ||
839 phdr->p_offset + phdr->p_filesz < stop)
843 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
844 if (phdr->p_vaddr >= seg->p_vaddr &&
845 phdr->p_vaddr + phdr->p_filesz <=
846 seg->p_vaddr + seg->p_memsz) {
848 (phdr->p_vaddr - seg->p_vaddr) +
850 params->hdr.e_phoff - phdr->p_offset;
857 /* determine where the dynamic section has wound up if there is one */
858 phdr = params->phdrs;
859 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
860 if (phdr->p_type != PT_DYNAMIC)
864 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
865 if (phdr->p_vaddr >= seg->p_vaddr &&
866 phdr->p_vaddr + phdr->p_memsz <=
867 seg->p_vaddr + seg->p_memsz) {
868 params->dynamic_addr =
869 (phdr->p_vaddr - seg->p_vaddr) +
872 /* check the dynamic section contains at least
873 * one item, and that the last item is a NULL
875 if (phdr->p_memsz == 0 ||
876 phdr->p_memsz % sizeof(Elf32_Dyn) != 0)
879 tmp = phdr->p_memsz / sizeof(Elf32_Dyn);
881 params->dynamic_addr)[tmp - 1].d_tag != 0)
889 /* now elide adjacent segments in the load map on MMU linux
890 * - on uClinux the holes between may actually be filled with system
891 * stuff or stuff from other processes
894 nloads = loadmap->nsegs;
895 mseg = loadmap->segs;
897 for (loop = 1; loop < nloads; loop++) {
898 /* see if we have a candidate for merging */
899 if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) {
900 load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz);
901 if (load_addr == (seg->addr & PAGE_MASK)) {
904 (mseg->addr + mseg->p_memsz);
905 mseg->p_memsz += seg->addr & ~PAGE_MASK;
906 mseg->p_memsz += seg->p_memsz;
918 kdebug("Mapped Object [%s]:", what);
919 kdebug("- elfhdr : %lx", params->elfhdr_addr);
920 kdebug("- entry : %lx", params->entry_addr);
921 kdebug("- PHDR[] : %lx", params->ph_addr);
922 kdebug("- DYNAMIC[]: %lx", params->dynamic_addr);
924 for (loop = 0; loop < loadmap->nsegs; loop++, seg++)
925 kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]",
927 seg->addr, seg->addr + seg->p_memsz - 1,
928 seg->p_vaddr, seg->p_memsz);
933 printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n",
934 what, file_inode(file)->i_ino);
938 /*****************************************************************************/
940 * map a file with constant displacement under uClinux
943 static int elf_fdpic_map_file_constdisp_on_uclinux(
944 struct elf_fdpic_params *params,
946 struct mm_struct *mm)
948 struct elf32_fdpic_loadseg *seg;
949 struct elf32_phdr *phdr;
950 unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags;
953 load_addr = params->load_addr;
954 seg = params->loadmap->segs;
956 /* determine the bounds of the contiguous overall allocation we must
958 phdr = params->phdrs;
959 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
960 if (params->phdrs[loop].p_type != PT_LOAD)
963 if (base > phdr->p_vaddr)
964 base = phdr->p_vaddr;
965 if (top < phdr->p_vaddr + phdr->p_memsz)
966 top = phdr->p_vaddr + phdr->p_memsz;
969 /* allocate one big anon block for everything */
970 mflags = MAP_PRIVATE;
971 if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
972 mflags |= MAP_EXECUTABLE;
974 maddr = vm_mmap(NULL, load_addr, top - base,
975 PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0);
976 if (IS_ERR_VALUE(maddr))
980 load_addr += PAGE_ALIGN(top - base);
982 /* and then load the file segments into it */
983 phdr = params->phdrs;
984 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
985 if (params->phdrs[loop].p_type != PT_LOAD)
988 seg->addr = maddr + (phdr->p_vaddr - base);
989 seg->p_vaddr = phdr->p_vaddr;
990 seg->p_memsz = phdr->p_memsz;
992 ret = read_code(file, seg->addr, phdr->p_offset,
997 /* map the ELF header address if in this segment */
998 if (phdr->p_offset == 0)
999 params->elfhdr_addr = seg->addr;
1001 /* clear any space allocated but not loaded */
1002 if (phdr->p_filesz < phdr->p_memsz) {
1003 if (clear_user((void *) (seg->addr + phdr->p_filesz),
1004 phdr->p_memsz - phdr->p_filesz))
1009 if (phdr->p_flags & PF_X) {
1010 if (!mm->start_code) {
1011 mm->start_code = seg->addr;
1012 mm->end_code = seg->addr +
1015 } else if (!mm->start_data) {
1016 mm->start_data = seg->addr;
1017 mm->end_data = seg->addr + phdr->p_memsz;
1028 /*****************************************************************************/
1030 * map a binary by direct mmap() of the individual PT_LOAD segments
1032 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
1034 struct mm_struct *mm)
1036 struct elf32_fdpic_loadseg *seg;
1037 struct elf32_phdr *phdr;
1038 unsigned long load_addr, delta_vaddr;
1041 load_addr = params->load_addr;
1045 seg = params->loadmap->segs;
1047 /* deal with each load segment separately */
1048 phdr = params->phdrs;
1049 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
1050 unsigned long maddr, disp, excess, excess1;
1051 int prot = 0, flags;
1053 if (phdr->p_type != PT_LOAD)
1056 kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx",
1057 (unsigned long) phdr->p_vaddr,
1058 (unsigned long) phdr->p_offset,
1059 (unsigned long) phdr->p_filesz,
1060 (unsigned long) phdr->p_memsz);
1062 /* determine the mapping parameters */
1063 if (phdr->p_flags & PF_R) prot |= PROT_READ;
1064 if (phdr->p_flags & PF_W) prot |= PROT_WRITE;
1065 if (phdr->p_flags & PF_X) prot |= PROT_EXEC;
1067 flags = MAP_PRIVATE | MAP_DENYWRITE;
1068 if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
1069 flags |= MAP_EXECUTABLE;
1073 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
1074 case ELF_FDPIC_FLAG_INDEPENDENT:
1075 /* PT_LOADs are independently locatable */
1078 case ELF_FDPIC_FLAG_HONOURVADDR:
1079 /* the specified virtual address must be honoured */
1080 maddr = phdr->p_vaddr;
1084 case ELF_FDPIC_FLAG_CONSTDISP:
1085 /* constant displacement
1086 * - can be mapped anywhere, but must be mapped as a
1091 delta_vaddr = phdr->p_vaddr;
1094 maddr = load_addr + phdr->p_vaddr - delta_vaddr;
1099 case ELF_FDPIC_FLAG_CONTIGUOUS:
1100 /* contiguity handled later */
1109 /* create the mapping */
1110 disp = phdr->p_vaddr & ~PAGE_MASK;
1111 maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags,
1112 phdr->p_offset - disp);
1114 kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx",
1115 loop, phdr->p_memsz + disp, prot, flags,
1116 phdr->p_offset - disp, maddr);
1118 if (IS_ERR_VALUE(maddr))
1121 if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
1122 ELF_FDPIC_FLAG_CONTIGUOUS)
1123 load_addr += PAGE_ALIGN(phdr->p_memsz + disp);
1125 seg->addr = maddr + disp;
1126 seg->p_vaddr = phdr->p_vaddr;
1127 seg->p_memsz = phdr->p_memsz;
1129 /* map the ELF header address if in this segment */
1130 if (phdr->p_offset == 0)
1131 params->elfhdr_addr = seg->addr;
1133 /* clear the bit between beginning of mapping and beginning of
1135 if (prot & PROT_WRITE && disp > 0) {
1136 kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp);
1137 if (clear_user((void __user *) maddr, disp))
1142 /* clear any space allocated but not loaded
1143 * - on uClinux we can just clear the lot
1144 * - on MMU linux we'll get a SIGBUS beyond the last page
1145 * extant in the file
1147 excess = phdr->p_memsz - phdr->p_filesz;
1148 excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK);
1151 if (excess > excess1) {
1152 unsigned long xaddr = maddr + phdr->p_filesz + excess1;
1153 unsigned long xmaddr;
1155 flags |= MAP_FIXED | MAP_ANONYMOUS;
1156 xmaddr = vm_mmap(NULL, xaddr, excess - excess1,
1159 kdebug("mmap[%d] <anon>"
1160 " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx",
1161 loop, xaddr, excess - excess1, prot, flags,
1164 if (xmaddr != xaddr)
1168 if (prot & PROT_WRITE && excess1 > 0) {
1169 kdebug("clear[%d] ad=%lx sz=%lx",
1170 loop, maddr + phdr->p_filesz, excess1);
1171 if (clear_user((void __user *) maddr + phdr->p_filesz,
1178 kdebug("clear[%d] ad=%lx sz=%lx",
1179 loop, maddr + phdr->p_filesz, excess);
1180 if (clear_user((void *) maddr + phdr->p_filesz, excess))
1186 if (phdr->p_flags & PF_X) {
1187 if (!mm->start_code) {
1188 mm->start_code = maddr;
1189 mm->end_code = maddr + phdr->p_memsz;
1191 } else if (!mm->start_data) {
1192 mm->start_data = maddr;
1193 mm->end_data = maddr + phdr->p_memsz;
1203 /*****************************************************************************/
1205 * ELF-FDPIC core dumper
1207 * Modelled on fs/exec.c:aout_core_dump()
1208 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1210 * Modelled on fs/binfmt_elf.c core dumper
1212 #ifdef CONFIG_ELF_CORE
1215 * Decide whether a segment is worth dumping; default is yes to be
1216 * sure (missing info is worse than too much; etc).
1217 * Personally I'd include everything, and use the coredump limit...
1219 * I think we should skip something. But I am not sure how. H.J.
1221 static int maydump(struct vm_area_struct *vma, unsigned long mm_flags)
1225 /* Do not dump I/O mapped devices or special mappings */
1226 if (vma->vm_flags & VM_IO) {
1227 kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags);
1231 /* If we may not read the contents, don't allow us to dump
1232 * them either. "dump_write()" can't handle it anyway.
1234 if (!(vma->vm_flags & VM_READ)) {
1235 kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags);
1239 /* By default, dump shared memory if mapped from an anonymous file. */
1240 if (vma->vm_flags & VM_SHARED) {
1241 if (file_inode(vma->vm_file)->i_nlink == 0) {
1242 dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags);
1243 kdcore("%08lx: %08lx: %s (share)", vma->vm_start,
1244 vma->vm_flags, dump_ok ? "yes" : "no");
1248 dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags);
1249 kdcore("%08lx: %08lx: %s (share)", vma->vm_start,
1250 vma->vm_flags, dump_ok ? "yes" : "no");
1255 /* By default, if it hasn't been written to, don't write it out */
1256 if (!vma->anon_vma) {
1257 dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags);
1258 kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start,
1259 vma->vm_flags, dump_ok ? "yes" : "no");
1264 dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags);
1265 kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags,
1266 dump_ok ? "yes" : "no");
1270 /* An ELF note in memory */
1275 unsigned int datasz;
1279 static int notesize(struct memelfnote *en)
1283 sz = sizeof(struct elf_note);
1284 sz += roundup(strlen(en->name) + 1, 4);
1285 sz += roundup(en->datasz, 4);
1292 static int writenote(struct memelfnote *men, struct coredump_params *cprm)
1295 en.n_namesz = strlen(men->name) + 1;
1296 en.n_descsz = men->datasz;
1297 en.n_type = men->type;
1299 return dump_emit(cprm, &en, sizeof(en)) &&
1300 dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&
1301 dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);
1304 static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
1306 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1307 elf->e_ident[EI_CLASS] = ELF_CLASS;
1308 elf->e_ident[EI_DATA] = ELF_DATA;
1309 elf->e_ident[EI_VERSION] = EV_CURRENT;
1310 elf->e_ident[EI_OSABI] = ELF_OSABI;
1311 memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
1313 elf->e_type = ET_CORE;
1314 elf->e_machine = ELF_ARCH;
1315 elf->e_version = EV_CURRENT;
1317 elf->e_phoff = sizeof(struct elfhdr);
1319 elf->e_flags = ELF_FDPIC_CORE_EFLAGS;
1320 elf->e_ehsize = sizeof(struct elfhdr);
1321 elf->e_phentsize = sizeof(struct elf_phdr);
1322 elf->e_phnum = segs;
1323 elf->e_shentsize = 0;
1325 elf->e_shstrndx = 0;
1329 static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1331 phdr->p_type = PT_NOTE;
1332 phdr->p_offset = offset;
1335 phdr->p_filesz = sz;
1342 static inline void fill_note(struct memelfnote *note, const char *name, int type,
1343 unsigned int sz, void *data)
1353 * fill up all the fields in prstatus from the given task struct, except
1354 * registers which need to be filled up separately.
1356 static void fill_prstatus(struct elf_prstatus *prstatus,
1357 struct task_struct *p, long signr)
1359 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1360 prstatus->pr_sigpend = p->pending.signal.sig[0];
1361 prstatus->pr_sighold = p->blocked.sig[0];
1363 prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1365 prstatus->pr_pid = task_pid_vnr(p);
1366 prstatus->pr_pgrp = task_pgrp_vnr(p);
1367 prstatus->pr_sid = task_session_vnr(p);
1368 if (thread_group_leader(p)) {
1369 struct task_cputime cputime;
1372 * This is the record for the group leader. It shows the
1373 * group-wide total, not its individual thread total.
1375 thread_group_cputime(p, &cputime);
1376 cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
1377 cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
1379 cputime_t utime, stime;
1381 task_cputime(p, &utime, &stime);
1382 cputime_to_timeval(utime, &prstatus->pr_utime);
1383 cputime_to_timeval(stime, &prstatus->pr_stime);
1385 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1386 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1388 prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap;
1389 prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap;
1392 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1393 struct mm_struct *mm)
1395 const struct cred *cred;
1396 unsigned int i, len;
1398 /* first copy the parameters from user space */
1399 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1401 len = mm->arg_end - mm->arg_start;
1402 if (len >= ELF_PRARGSZ)
1403 len = ELF_PRARGSZ - 1;
1404 if (copy_from_user(&psinfo->pr_psargs,
1405 (const char __user *) mm->arg_start, len))
1407 for (i = 0; i < len; i++)
1408 if (psinfo->pr_psargs[i] == 0)
1409 psinfo->pr_psargs[i] = ' ';
1410 psinfo->pr_psargs[len] = 0;
1413 psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1415 psinfo->pr_pid = task_pid_vnr(p);
1416 psinfo->pr_pgrp = task_pgrp_vnr(p);
1417 psinfo->pr_sid = task_session_vnr(p);
1419 i = p->state ? ffz(~p->state) + 1 : 0;
1420 psinfo->pr_state = i;
1421 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1422 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1423 psinfo->pr_nice = task_nice(p);
1424 psinfo->pr_flag = p->flags;
1426 cred = __task_cred(p);
1427 SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
1428 SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
1430 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1435 /* Here is the structure in which status of each thread is captured. */
1436 struct elf_thread_status
1438 struct list_head list;
1439 struct elf_prstatus prstatus; /* NT_PRSTATUS */
1440 elf_fpregset_t fpu; /* NT_PRFPREG */
1441 struct task_struct *thread;
1442 #ifdef ELF_CORE_COPY_XFPREGS
1443 elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */
1445 struct memelfnote notes[3];
1450 * In order to add the specific thread information for the elf file format,
1451 * we need to keep a linked list of every thread's pr_status and then create
1452 * a single section for them in the final core file.
1454 static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1456 struct task_struct *p = t->thread;
1461 fill_prstatus(&t->prstatus, p, signr);
1462 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1464 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1467 sz += notesize(&t->notes[0]);
1469 t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu);
1470 if (t->prstatus.pr_fpvalid) {
1471 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1474 sz += notesize(&t->notes[1]);
1477 #ifdef ELF_CORE_COPY_XFPREGS
1478 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1479 fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
1480 sizeof(t->xfpu), &t->xfpu);
1482 sz += notesize(&t->notes[2]);
1488 static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
1489 elf_addr_t e_shoff, int segs)
1491 elf->e_shoff = e_shoff;
1492 elf->e_shentsize = sizeof(*shdr4extnum);
1494 elf->e_shstrndx = SHN_UNDEF;
1496 memset(shdr4extnum, 0, sizeof(*shdr4extnum));
1498 shdr4extnum->sh_type = SHT_NULL;
1499 shdr4extnum->sh_size = elf->e_shnum;
1500 shdr4extnum->sh_link = elf->e_shstrndx;
1501 shdr4extnum->sh_info = segs;
1505 * dump the segments for an MMU process
1507 static bool elf_fdpic_dump_segments(struct coredump_params *cprm)
1509 struct vm_area_struct *vma;
1511 for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1514 if (!maydump(vma, cprm->mm_flags))
1518 for (addr = vma->vm_start; addr < vma->vm_end;
1519 addr += PAGE_SIZE) {
1521 struct page *page = get_dump_page(addr);
1523 void *kaddr = kmap(page);
1524 res = dump_emit(cprm, kaddr, PAGE_SIZE);
1526 page_cache_release(page);
1528 res = dump_skip(cprm, PAGE_SIZE);
1534 if (!dump_emit(cprm, (void *) vma->vm_start,
1535 vma->vm_end - vma->vm_start))
1542 static size_t elf_core_vma_data_size(unsigned long mm_flags)
1544 struct vm_area_struct *vma;
1547 for (vma = current->mm->mmap; vma; vma = vma->vm_next)
1548 if (maydump(vma, mm_flags))
1549 size += vma->vm_end - vma->vm_start;
1556 * This is a two-pass process; first we find the offsets of the bits,
1557 * and then they are actually written out. If we run out of core limit
1560 static int elf_fdpic_core_dump(struct coredump_params *cprm)
1567 struct vm_area_struct *vma;
1568 struct elfhdr *elf = NULL;
1569 loff_t offset = 0, dataoff;
1571 struct memelfnote *notes = NULL;
1572 struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
1573 struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
1574 LIST_HEAD(thread_list);
1575 struct list_head *t;
1576 elf_fpregset_t *fpu = NULL;
1577 #ifdef ELF_CORE_COPY_XFPREGS
1578 elf_fpxregset_t *xfpu = NULL;
1580 int thread_status_size = 0;
1582 struct elf_phdr *phdr4note = NULL;
1583 struct elf_shdr *shdr4extnum = NULL;
1586 struct core_thread *ct;
1587 struct elf_thread_status *tmp;
1590 * We no longer stop all VM operations.
1592 * This is because those proceses that could possibly change map_count
1593 * or the mmap / vma pages are now blocked in do_exit on current
1594 * finishing this core dump.
1596 * Only ptrace can touch these memory addresses, but it doesn't change
1597 * the map_count or the pages allocated. So no possibility of crashing
1598 * exists while dumping the mm->vm_next areas to the core file.
1601 /* alloc memory for large data structures: too large to be on stack */
1602 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1605 prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL);
1608 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1611 notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
1614 fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
1617 #ifdef ELF_CORE_COPY_XFPREGS
1618 xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
1623 for (ct = current->mm->core_state->dumper.next;
1624 ct; ct = ct->next) {
1625 tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
1629 tmp->thread = ct->task;
1630 list_add(&tmp->list, &thread_list);
1633 list_for_each(t, &thread_list) {
1634 struct elf_thread_status *tmp;
1637 tmp = list_entry(t, struct elf_thread_status, list);
1638 sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp);
1639 thread_status_size += sz;
1642 /* now collect the dump for the current */
1643 fill_prstatus(prstatus, current, cprm->siginfo->si_signo);
1644 elf_core_copy_regs(&prstatus->pr_reg, cprm->regs);
1646 segs = current->mm->map_count;
1647 segs += elf_core_extra_phdrs();
1649 /* for notes section */
1652 /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
1653 * this, kernel supports extended numbering. Have a look at
1654 * include/linux/elf.h for further information. */
1655 e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
1658 fill_elf_fdpic_header(elf, e_phnum);
1662 * Set up the notes in similar form to SVR4 core dumps made
1663 * with info from their /proc.
1666 fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
1667 fill_psinfo(psinfo, current->group_leader, current->mm);
1668 fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1672 auxv = (elf_addr_t *) current->mm->saved_auxv;
1677 while (auxv[i - 2] != AT_NULL);
1678 fill_note(¬es[numnote++], "CORE", NT_AUXV,
1679 i * sizeof(elf_addr_t), auxv);
1681 /* Try to dump the FPU. */
1682 if ((prstatus->pr_fpvalid =
1683 elf_core_copy_task_fpregs(current, cprm->regs, fpu)))
1684 fill_note(notes + numnote++,
1685 "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
1686 #ifdef ELF_CORE_COPY_XFPREGS
1687 if (elf_core_copy_task_xfpregs(current, xfpu))
1688 fill_note(notes + numnote++,
1689 "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu);
1695 offset += sizeof(*elf); /* Elf header */
1696 offset += segs * sizeof(struct elf_phdr); /* Program headers */
1698 /* Write notes phdr entry */
1702 for (i = 0; i < numnote; i++)
1703 sz += notesize(notes + i);
1705 sz += thread_status_size;
1707 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
1711 fill_elf_note_phdr(phdr4note, sz, offset);
1715 /* Page-align dumped data */
1716 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1718 offset += elf_core_vma_data_size(cprm->mm_flags);
1719 offset += elf_core_extra_data_size();
1722 if (e_phnum == PN_XNUM) {
1723 shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
1726 fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
1731 if (!dump_emit(cprm, elf, sizeof(*elf)))
1734 if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note)))
1737 /* write program headers for segments dump */
1738 for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1739 struct elf_phdr phdr;
1742 sz = vma->vm_end - vma->vm_start;
1744 phdr.p_type = PT_LOAD;
1745 phdr.p_offset = offset;
1746 phdr.p_vaddr = vma->vm_start;
1748 phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0;
1750 offset += phdr.p_filesz;
1751 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
1752 if (vma->vm_flags & VM_WRITE)
1753 phdr.p_flags |= PF_W;
1754 if (vma->vm_flags & VM_EXEC)
1755 phdr.p_flags |= PF_X;
1756 phdr.p_align = ELF_EXEC_PAGESIZE;
1758 if (!dump_emit(cprm, &phdr, sizeof(phdr)))
1762 if (!elf_core_write_extra_phdrs(cprm, offset))
1765 /* write out the notes section */
1766 for (i = 0; i < numnote; i++)
1767 if (!writenote(notes + i, cprm))
1770 /* write out the thread status notes section */
1771 list_for_each(t, &thread_list) {
1772 struct elf_thread_status *tmp =
1773 list_entry(t, struct elf_thread_status, list);
1775 for (i = 0; i < tmp->num_notes; i++)
1776 if (!writenote(&tmp->notes[i], cprm))
1780 if (!dump_skip(cprm, dataoff - cprm->written))
1783 if (!elf_fdpic_dump_segments(cprm))
1786 if (!elf_core_write_extra_data(cprm))
1789 if (e_phnum == PN_XNUM) {
1790 if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum)))
1794 if (cprm->file->f_pos != offset) {
1797 "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
1798 cprm->file->f_pos, offset);
1805 while (!list_empty(&thread_list)) {
1806 struct list_head *tmp = thread_list.next;
1808 kfree(list_entry(tmp, struct elf_thread_status, list));
1817 #ifdef ELF_CORE_COPY_XFPREGS
1824 #endif /* CONFIG_ELF_CORE */