blob: 100edcc5e3122323eb8f4087305e623c666eceb0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/binfmt_elf.c
3 *
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
7 * Tools".
8 *
9 * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/mm.h>
16#include <linux/mman.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/errno.h>
18#include <linux/signal.h>
19#include <linux/binfmts.h>
20#include <linux/string.h>
21#include <linux/file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/personality.h>
24#include <linux/elfcore.h>
25#include <linux/init.h>
26#include <linux/highuid.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/compiler.h>
28#include <linux/highmem.h>
29#include <linux/pagemap.h>
Denys Vlasenko2aa362c2012-10-04 17:15:36 -070030#include <linux/vmalloc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/security.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/random.h>
Jesper Juhlf4e5cc22006-06-23 02:05:35 -070033#include <linux/elf.h>
Alexey Dobriyan7e80d0d2007-05-08 00:28:59 -070034#include <linux/utsname.h>
Daisuke HATAYAMA088e7af2010-03-05 13:44:06 -080035#include <linux/coredump.h>
Frederic Weisbecker6fac4822012-11-13 14:20:55 +010036#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <asm/uaccess.h>
38#include <asm/param.h>
39#include <asm/page.h>
40
Denys Vlasenko2aa362c2012-10-04 17:15:36 -070041#ifndef user_long_t
42#define user_long_t long
43#endif
Denys Vlasenko49ae4d42012-10-04 17:15:35 -070044#ifndef user_siginfo_t
45#define user_siginfo_t siginfo_t
46#endif
47
Al Viro71613c32012-10-20 22:00:48 -040048static int load_elf_binary(struct linux_binprm *bprm);
Jesper Juhlf4e5cc22006-06-23 02:05:35 -070049static int load_elf_library(struct file *);
Andrew Mortonbb1ad822008-01-30 13:31:07 +010050static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *,
51 int, int, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Linus Torvalds1da177e2005-04-16 15:20:36 -070053/*
54 * If we don't support core dumping, then supply a NULL so we
55 * don't even try.
56 */
Christoph Hellwig698ba7b2009-12-15 16:47:37 -080057#ifdef CONFIG_ELF_CORE
Masami Hiramatsuf6151df2009-12-17 15:27:16 -080058static int elf_core_dump(struct coredump_params *cprm);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#else
60#define elf_core_dump NULL
61#endif
62
63#if ELF_EXEC_PAGESIZE > PAGE_SIZE
Jesper Juhlf4e5cc22006-06-23 02:05:35 -070064#define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#else
Jesper Juhlf4e5cc22006-06-23 02:05:35 -070066#define ELF_MIN_ALIGN PAGE_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#endif
68
69#ifndef ELF_CORE_EFLAGS
70#define ELF_CORE_EFLAGS 0
71#endif
72
73#define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
74#define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
75#define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
76
77static struct linux_binfmt elf_format = {
Mikael Petterssonf670d0e2011-01-12 17:00:02 -080078 .module = THIS_MODULE,
79 .load_binary = load_elf_binary,
80 .load_shlib = load_elf_library,
81 .core_dump = elf_core_dump,
82 .min_coredump = ELF_EXEC_PAGESIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -070083};
84
Andrew Mortond4e3cc32007-07-21 04:37:32 -070085#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87static int set_brk(unsigned long start, unsigned long end)
88{
89 start = ELF_PAGEALIGN(start);
90 end = ELF_PAGEALIGN(end);
91 if (end > start) {
92 unsigned long addr;
Linus Torvaldse4eb1ff2012-04-20 15:35:40 -070093 addr = vm_brk(start, end - start);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 if (BAD_ADDR(addr))
95 return addr;
96 }
97 current->mm->start_brk = current->mm->brk = end;
98 return 0;
99}
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101/* We need to explicitly zero any fractional pages
102 after the data section (i.e. bss). This would
103 contain the junk from the file that should not
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700104 be in memory
105 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106static int padzero(unsigned long elf_bss)
107{
108 unsigned long nbyte;
109
110 nbyte = ELF_PAGEOFFSET(elf_bss);
111 if (nbyte) {
112 nbyte = ELF_MIN_ALIGN - nbyte;
113 if (clear_user((void __user *) elf_bss, nbyte))
114 return -EFAULT;
115 }
116 return 0;
117}
118
Ohad Ben-Cohen09c6dd32008-02-03 18:05:15 +0200119/* Let's use some macros to make this stack manipulation a little clearer */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120#ifdef CONFIG_STACK_GROWSUP
121#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
122#define STACK_ROUND(sp, items) \
123 ((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700124#define STACK_ALLOC(sp, len) ({ \
125 elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \
126 old_sp; })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127#else
128#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
129#define STACK_ROUND(sp, items) \
130 (((unsigned long) (sp - items)) &~ 15UL)
131#define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
132#endif
133
Nathan Lynch483fad12008-07-22 04:48:46 +1000134#ifndef ELF_BASE_PLATFORM
135/*
136 * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
137 * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
138 * will be copied to the user stack in the same manner as AT_PLATFORM.
139 */
140#define ELF_BASE_PLATFORM NULL
141#endif
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143static int
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700144create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
Andi Kleend20894a2008-02-08 04:21:54 -0800145 unsigned long load_addr, unsigned long interp_load_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146{
147 unsigned long p = bprm->p;
148 int argc = bprm->argc;
149 int envc = bprm->envc;
150 elf_addr_t __user *argv;
151 elf_addr_t __user *envp;
152 elf_addr_t __user *sp;
153 elf_addr_t __user *u_platform;
Nathan Lynch483fad12008-07-22 04:48:46 +1000154 elf_addr_t __user *u_base_platform;
Kees Cookf06295b2009-01-07 18:08:52 -0800155 elf_addr_t __user *u_rand_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 const char *k_platform = ELF_PLATFORM;
Nathan Lynch483fad12008-07-22 04:48:46 +1000157 const char *k_base_platform = ELF_BASE_PLATFORM;
Kees Cookf06295b2009-01-07 18:08:52 -0800158 unsigned char k_rand_bytes[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 int items;
160 elf_addr_t *elf_info;
161 int ei_index = 0;
David Howells86a264a2008-11-14 10:39:18 +1100162 const struct cred *cred = current_cred();
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700163 struct vm_area_struct *vma;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165 /*
Franck Bui-Huud68c9d62007-10-16 23:30:24 -0700166 * In some cases (e.g. Hyper-Threading), we want to avoid L1
167 * evictions by the processes running on the same package. One
168 * thing we can do is to shuffle the initial stack for them.
169 */
170
171 p = arch_align_stack(p);
172
173 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 * If this architecture has a platform capability string, copy it
175 * to userspace. In some cases (Sparc), this info is impossible
176 * for userspace to get any other way, in others (i386) it is
177 * merely difficult.
178 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 u_platform = NULL;
180 if (k_platform) {
181 size_t len = strlen(k_platform) + 1;
182
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
184 if (__copy_to_user(u_platform, k_platform, len))
185 return -EFAULT;
186 }
187
Nathan Lynch483fad12008-07-22 04:48:46 +1000188 /*
189 * If this architecture has a "base" platform capability
190 * string, copy it to userspace.
191 */
192 u_base_platform = NULL;
193 if (k_base_platform) {
194 size_t len = strlen(k_base_platform) + 1;
195
196 u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
197 if (__copy_to_user(u_base_platform, k_base_platform, len))
198 return -EFAULT;
199 }
200
Kees Cookf06295b2009-01-07 18:08:52 -0800201 /*
202 * Generate 16 random bytes for userspace PRNG seeding.
203 */
204 get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes));
205 u_rand_bytes = (elf_addr_t __user *)
206 STACK_ALLOC(p, sizeof(k_rand_bytes));
207 if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes)))
208 return -EFAULT;
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 /* Create the ELF interpreter info */
Jesper Juhl785d5572006-06-23 02:05:35 -0700211 elf_info = (elf_addr_t *)current->mm->saved_auxv;
Olaf Hering4f9a58d2007-10-16 23:30:12 -0700212 /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213#define NEW_AUX_ENT(id, val) \
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700214 do { \
Jesper Juhl785d5572006-06-23 02:05:35 -0700215 elf_info[ei_index++] = id; \
216 elf_info[ei_index++] = val; \
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700217 } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
219#ifdef ARCH_DLINFO
220 /*
221 * ARCH_DLINFO must come first so PPC can do its special alignment of
222 * AUXV.
Olaf Hering4f9a58d2007-10-16 23:30:12 -0700223 * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in
224 * ARCH_DLINFO changes
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 */
226 ARCH_DLINFO;
227#endif
228 NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
229 NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE);
230 NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
231 NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff);
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700232 NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
234 NEW_AUX_ENT(AT_BASE, interp_load_addr);
235 NEW_AUX_ENT(AT_FLAGS, 0);
236 NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
Eric W. Biedermanebc887b2012-02-07 18:36:10 -0800237 NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid));
238 NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid));
239 NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid));
240 NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid));
Jesper Juhl785d5572006-06-23 02:05:35 -0700241 NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
Kees Cookf06295b2009-01-07 18:08:52 -0800242 NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes);
Michael Neuling21713642013-04-17 17:33:11 +0000243#ifdef ELF_HWCAP2
244 NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);
245#endif
John Reiser65191082008-07-21 14:21:32 -0700246 NEW_AUX_ENT(AT_EXECFN, bprm->exec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 if (k_platform) {
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700248 NEW_AUX_ENT(AT_PLATFORM,
Jesper Juhl785d5572006-06-23 02:05:35 -0700249 (elf_addr_t)(unsigned long)u_platform);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 }
Nathan Lynch483fad12008-07-22 04:48:46 +1000251 if (k_base_platform) {
252 NEW_AUX_ENT(AT_BASE_PLATFORM,
253 (elf_addr_t)(unsigned long)u_base_platform);
254 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
Jesper Juhl785d5572006-06-23 02:05:35 -0700256 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 }
258#undef NEW_AUX_ENT
259 /* AT_NULL is zero; clear the rest too */
260 memset(&elf_info[ei_index], 0,
261 sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]);
262
263 /* And advance past the AT_NULL entry. */
264 ei_index += 2;
265
266 sp = STACK_ADD(p, ei_index);
267
Andi Kleend20894a2008-02-08 04:21:54 -0800268 items = (argc + 1) + (envc + 1) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 bprm->p = STACK_ROUND(sp, items);
270
271 /* Point sp at the lowest address on the stack */
272#ifdef CONFIG_STACK_GROWSUP
273 sp = (elf_addr_t __user *)bprm->p - items - ei_index;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700274 bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275#else
276 sp = (elf_addr_t __user *)bprm->p;
277#endif
278
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700279
280 /*
281 * Grow the stack manually; some architectures have a limit on how
282 * far ahead a user-space access may be in order to grow the stack.
283 */
284 vma = find_extend_vma(current->mm, bprm->p);
285 if (!vma)
286 return -EFAULT;
287
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 /* Now, let's put argc (and argv, envp if appropriate) on the stack */
289 if (__put_user(argc, sp++))
290 return -EFAULT;
Andi Kleend20894a2008-02-08 04:21:54 -0800291 argv = sp;
292 envp = argv + argc + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
294 /* Populate argv and envp */
Greg Kroah-Hartmana84a5052005-05-11 00:10:44 -0700295 p = current->mm->arg_end = current->mm->arg_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 while (argc-- > 0) {
297 size_t len;
Heiko Carstens841d5fb2006-12-06 20:36:35 -0800298 if (__put_user((elf_addr_t)p, argv++))
299 return -EFAULT;
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700300 len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
301 if (!len || len > MAX_ARG_STRLEN)
WANG Cong23c49712008-05-08 21:52:33 +0800302 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 p += len;
304 }
305 if (__put_user(0, argv))
306 return -EFAULT;
307 current->mm->arg_end = current->mm->env_start = p;
308 while (envc-- > 0) {
309 size_t len;
Heiko Carstens841d5fb2006-12-06 20:36:35 -0800310 if (__put_user((elf_addr_t)p, envp++))
311 return -EFAULT;
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700312 len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
313 if (!len || len > MAX_ARG_STRLEN)
WANG Cong23c49712008-05-08 21:52:33 +0800314 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 p += len;
316 }
317 if (__put_user(0, envp))
318 return -EFAULT;
319 current->mm->env_end = p;
320
321 /* Put the elf_info on the stack in the right place. */
322 sp = (elf_addr_t __user *)envp + 1;
323 if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t)))
324 return -EFAULT;
325 return 0;
326}
327
James Hoganc07380b2011-05-09 10:58:40 +0100328#ifndef elf_map
329
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330static unsigned long elf_map(struct file *filep, unsigned long addr,
Jiri Kosinacc503c12008-01-30 13:31:07 +0100331 struct elf_phdr *eppnt, int prot, int type,
332 unsigned long total_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333{
334 unsigned long map_addr;
Jiri Kosinacc503c12008-01-30 13:31:07 +0100335 unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr);
336 unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr);
337 addr = ELF_PAGESTART(addr);
338 size = ELF_PAGEALIGN(size);
Jan Kratochvil60bfba72007-07-15 23:40:06 -0700339
Andrew Mortond4e3cc32007-07-21 04:37:32 -0700340 /* mmap() will return -EINVAL if given a zero size, but a
341 * segment with zero filesize is perfectly valid */
Jiri Kosinacc503c12008-01-30 13:31:07 +0100342 if (!size)
343 return addr;
344
Jiri Kosinacc503c12008-01-30 13:31:07 +0100345 /*
346 * total_size is the size of the ELF (interpreter) image.
347 * The _first_ mmap needs to know the full size, otherwise
348 * randomization might put this image into an overlapping
349 * position with the ELF binary image. (since size < total_size)
350 * So we first map the 'big' image - and unmap the remainder at
351 * the end. (which unmap is needed for ELF images with holes.)
352 */
353 if (total_size) {
354 total_size = ELF_PAGEALIGN(total_size);
Al Viro5a5e4c22012-05-30 01:49:38 -0400355 map_addr = vm_mmap(filep, addr, total_size, prot, type, off);
Jiri Kosinacc503c12008-01-30 13:31:07 +0100356 if (!BAD_ADDR(map_addr))
Al Viro5a5e4c22012-05-30 01:49:38 -0400357 vm_munmap(map_addr+size, total_size-size);
Jiri Kosinacc503c12008-01-30 13:31:07 +0100358 } else
Al Viro5a5e4c22012-05-30 01:49:38 -0400359 map_addr = vm_mmap(filep, addr, size, prot, type, off);
Jiri Kosinacc503c12008-01-30 13:31:07 +0100360
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 return(map_addr);
362}
363
James Hoganc07380b2011-05-09 10:58:40 +0100364#endif /* !elf_map */
365
Jiri Kosinacc503c12008-01-30 13:31:07 +0100366static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr)
367{
368 int i, first_idx = -1, last_idx = -1;
369
370 for (i = 0; i < nr; i++) {
371 if (cmds[i].p_type == PT_LOAD) {
372 last_idx = i;
373 if (first_idx == -1)
374 first_idx = i;
375 }
376 }
377 if (first_idx == -1)
378 return 0;
379
380 return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz -
381 ELF_PAGESTART(cmds[first_idx].p_vaddr);
382}
383
384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385/* This is much more generalized than the library routine read function,
386 so we keep this separate. Technically the library read function
387 is only provided so that we can read a.out libraries that have
388 an ELF header */
389
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700390static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
Jiri Kosinacc503c12008-01-30 13:31:07 +0100391 struct file *interpreter, unsigned long *interp_map_addr,
392 unsigned long no_base)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393{
394 struct elf_phdr *elf_phdata;
395 struct elf_phdr *eppnt;
396 unsigned long load_addr = 0;
397 int load_addr_set = 0;
398 unsigned long last_bss = 0, elf_bss = 0;
399 unsigned long error = ~0UL;
Jiri Kosinacc503c12008-01-30 13:31:07 +0100400 unsigned long total_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 int retval, i, size;
402
403 /* First of all, some simple consistency checks */
404 if (interp_elf_ex->e_type != ET_EXEC &&
405 interp_elf_ex->e_type != ET_DYN)
406 goto out;
407 if (!elf_check_arch(interp_elf_ex))
408 goto out;
409 if (!interpreter->f_op || !interpreter->f_op->mmap)
410 goto out;
411
412 /*
413 * If the size of this structure has changed, then punt, since
414 * we will be doing the wrong thing.
415 */
416 if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr))
417 goto out;
418 if (interp_elf_ex->e_phnum < 1 ||
419 interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr))
420 goto out;
421
422 /* Now read in all of the header information */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum;
424 if (size > ELF_MIN_ALIGN)
425 goto out;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700426 elf_phdata = kmalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 if (!elf_phdata)
428 goto out;
429
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700430 retval = kernel_read(interpreter, interp_elf_ex->e_phoff,
Mikael Petterssonf670d0e2011-01-12 17:00:02 -0800431 (char *)elf_phdata, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 error = -EIO;
433 if (retval != size) {
434 if (retval < 0)
435 error = retval;
436 goto out_close;
437 }
438
Jiri Kosinacc503c12008-01-30 13:31:07 +0100439 total_size = total_mapping_size(elf_phdata, interp_elf_ex->e_phnum);
440 if (!total_size) {
441 error = -EINVAL;
442 goto out_close;
443 }
444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 eppnt = elf_phdata;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700446 for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
447 if (eppnt->p_type == PT_LOAD) {
448 int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
449 int elf_prot = 0;
450 unsigned long vaddr = 0;
451 unsigned long k, map_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700453 if (eppnt->p_flags & PF_R)
454 elf_prot = PROT_READ;
455 if (eppnt->p_flags & PF_W)
456 elf_prot |= PROT_WRITE;
457 if (eppnt->p_flags & PF_X)
458 elf_prot |= PROT_EXEC;
459 vaddr = eppnt->p_vaddr;
460 if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
461 elf_type |= MAP_FIXED;
Jiri Kosinacc503c12008-01-30 13:31:07 +0100462 else if (no_base && interp_elf_ex->e_type == ET_DYN)
463 load_addr = -vaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700465 map_addr = elf_map(interpreter, load_addr + vaddr,
Andrew Mortonbb1ad822008-01-30 13:31:07 +0100466 eppnt, elf_prot, elf_type, total_size);
Jiri Kosinacc503c12008-01-30 13:31:07 +0100467 total_size = 0;
468 if (!*interp_map_addr)
469 *interp_map_addr = map_addr;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700470 error = map_addr;
471 if (BAD_ADDR(map_addr))
472 goto out_close;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700474 if (!load_addr_set &&
475 interp_elf_ex->e_type == ET_DYN) {
476 load_addr = map_addr - ELF_PAGESTART(vaddr);
477 load_addr_set = 1;
478 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700480 /*
481 * Check to see if the section's size will overflow the
482 * allowed task size. Note that p_filesz must always be
483 * <= p_memsize so it's only necessary to check p_memsz.
484 */
485 k = load_addr + eppnt->p_vaddr;
Chuck Ebbertce510592006-07-03 00:24:14 -0700486 if (BAD_ADDR(k) ||
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700487 eppnt->p_filesz > eppnt->p_memsz ||
488 eppnt->p_memsz > TASK_SIZE ||
489 TASK_SIZE - eppnt->p_memsz < k) {
490 error = -ENOMEM;
491 goto out_close;
492 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700494 /*
495 * Find the end of the file mapping for this phdr, and
496 * keep track of the largest address we see for this.
497 */
498 k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
499 if (k > elf_bss)
500 elf_bss = k;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700502 /*
503 * Do the same thing for the memory mapping - between
504 * elf_bss and last_bss is the bss section.
505 */
506 k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
507 if (k > last_bss)
508 last_bss = k;
509 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 }
511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 if (last_bss > elf_bss) {
Roland McGrath752015d2009-09-08 19:49:40 -0700513 /*
514 * Now fill out the bss section. First pad the last page up
515 * to the page boundary, and then perform a mmap to make sure
516 * that there are zero-mapped pages up to and including the
517 * last bss page.
518 */
519 if (padzero(elf_bss)) {
520 error = -EFAULT;
521 goto out_close;
522 }
523
524 /* What we have mapped so far */
525 elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1);
526
527 /* Map the last of the bss segment */
Linus Torvaldse4eb1ff2012-04-20 15:35:40 -0700528 error = vm_brk(elf_bss, last_bss - elf_bss);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 if (BAD_ADDR(error))
530 goto out_close;
531 }
532
Jiri Kosinacc503c12008-01-30 13:31:07 +0100533 error = load_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535out_close:
536 kfree(elf_phdata);
537out:
538 return error;
539}
540
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541/*
542 * These are the functions used to load ELF style executables and shared
543 * libraries. There is no binary dependent code anywhere else.
544 */
545
546#define INTERPRETER_NONE 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547#define INTERPRETER_ELF 2
548
Andi Kleen913bd902006-03-25 16:29:09 +0100549#ifndef STACK_RND_MASK
James Bottomleyd1cabd62007-03-16 13:38:35 -0800550#define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) /* 8MB of VA */
Andi Kleen913bd902006-03-25 16:29:09 +0100551#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552
553static unsigned long randomize_stack_top(unsigned long stack_top)
554{
555 unsigned int random_variable = 0;
556
Andi Kleenc16b63e02006-09-26 10:52:28 +0200557 if ((current->flags & PF_RANDOMIZE) &&
558 !(current->personality & ADDR_NO_RANDOMIZE)) {
Andi Kleen913bd902006-03-25 16:29:09 +0100559 random_variable = get_random_int() & STACK_RND_MASK;
560 random_variable <<= PAGE_SHIFT;
561 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562#ifdef CONFIG_STACK_GROWSUP
Andi Kleen913bd902006-03-25 16:29:09 +0100563 return PAGE_ALIGN(stack_top) + random_variable;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564#else
Andi Kleen913bd902006-03-25 16:29:09 +0100565 return PAGE_ALIGN(stack_top) - random_variable;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566#endif
567}
568
Al Viro71613c32012-10-20 22:00:48 -0400569static int load_elf_binary(struct linux_binprm *bprm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570{
571 struct file *interpreter = NULL; /* to shut gcc up */
572 unsigned long load_addr = 0, load_bias = 0;
573 int load_addr_set = 0;
574 char * elf_interpreter = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 unsigned long error;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700576 struct elf_phdr *elf_ppnt, *elf_phdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 unsigned long elf_bss, elf_brk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 int retval, i;
579 unsigned int size;
Jiri Kosinacc503c12008-01-30 13:31:07 +0100580 unsigned long elf_entry;
581 unsigned long interp_load_addr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 unsigned long start_code, end_code, start_data, end_data;
David Daney1a530a62011-03-22 16:34:48 -0700583 unsigned long reloc_func_desc __maybe_unused = 0;
David Rientjes8de61e62006-12-06 20:40:16 -0800584 int executable_stack = EXSTACK_DEFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 unsigned long def_flags = 0;
Al Viro71613c32012-10-20 22:00:48 -0400586 struct pt_regs *regs = current_pt_regs();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 struct {
588 struct elfhdr elf_ex;
589 struct elfhdr interp_elf_ex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 } *loc;
591
592 loc = kmalloc(sizeof(*loc), GFP_KERNEL);
593 if (!loc) {
594 retval = -ENOMEM;
595 goto out_ret;
596 }
597
598 /* Get the exec-header */
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700599 loc->elf_ex = *((struct elfhdr *)bprm->buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
601 retval = -ENOEXEC;
602 /* First of all, some simple consistency checks */
603 if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
604 goto out;
605
606 if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN)
607 goto out;
608 if (!elf_check_arch(&loc->elf_ex))
609 goto out;
Mikael Petterssonf670d0e2011-01-12 17:00:02 -0800610 if (!bprm->file->f_op || !bprm->file->f_op->mmap)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 goto out;
612
613 /* Now read in all of the header information */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr))
615 goto out;
616 if (loc->elf_ex.e_phnum < 1 ||
617 loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr))
618 goto out;
619 size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr);
620 retval = -ENOMEM;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700621 elf_phdata = kmalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 if (!elf_phdata)
623 goto out;
624
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700625 retval = kernel_read(bprm->file, loc->elf_ex.e_phoff,
626 (char *)elf_phdata, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 if (retval != size) {
628 if (retval >= 0)
629 retval = -EIO;
630 goto out_free_ph;
631 }
632
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 elf_ppnt = elf_phdata;
634 elf_bss = 0;
635 elf_brk = 0;
636
637 start_code = ~0UL;
638 end_code = 0;
639 start_data = 0;
640 end_data = 0;
641
642 for (i = 0; i < loc->elf_ex.e_phnum; i++) {
643 if (elf_ppnt->p_type == PT_INTERP) {
644 /* This is the program interpreter used for
645 * shared libraries - for now assume that this
646 * is an a.out format binary
647 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 retval = -ENOEXEC;
649 if (elf_ppnt->p_filesz > PATH_MAX ||
650 elf_ppnt->p_filesz < 2)
Al Viroe7b9b552009-03-29 16:31:16 -0400651 goto out_free_ph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
653 retval = -ENOMEM;
Jesper Juhl792db3a2006-01-09 20:54:45 -0800654 elf_interpreter = kmalloc(elf_ppnt->p_filesz,
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700655 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 if (!elf_interpreter)
Al Viroe7b9b552009-03-29 16:31:16 -0400657 goto out_free_ph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
659 retval = kernel_read(bprm->file, elf_ppnt->p_offset,
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700660 elf_interpreter,
661 elf_ppnt->p_filesz);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 if (retval != elf_ppnt->p_filesz) {
663 if (retval >= 0)
664 retval = -EIO;
665 goto out_free_interp;
666 }
667 /* make sure path is NULL terminated */
668 retval = -ENOEXEC;
669 if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
670 goto out_free_interp;
671
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 interpreter = open_exec(elf_interpreter);
673 retval = PTR_ERR(interpreter);
674 if (IS_ERR(interpreter))
675 goto out_free_interp;
Alexey Dobriyan1fb84492007-01-26 00:57:16 -0800676
677 /*
678 * If the binary is not readable then enforce
679 * mm->dumpable = 0 regardless of the interpreter's
680 * permissions.
681 */
Al Viro1b5d7832011-06-19 12:49:47 -0400682 would_dump(bprm, interpreter);
Alexey Dobriyan1fb84492007-01-26 00:57:16 -0800683
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700684 retval = kernel_read(interpreter, 0, bprm->buf,
685 BINPRM_BUF_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 if (retval != BINPRM_BUF_SIZE) {
687 if (retval >= 0)
688 retval = -EIO;
689 goto out_free_dentry;
690 }
691
692 /* Get the exec headers */
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700693 loc->interp_elf_ex = *((struct elfhdr *)bprm->buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 break;
695 }
696 elf_ppnt++;
697 }
698
699 elf_ppnt = elf_phdata;
700 for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++)
701 if (elf_ppnt->p_type == PT_GNU_STACK) {
702 if (elf_ppnt->p_flags & PF_X)
703 executable_stack = EXSTACK_ENABLE_X;
704 else
705 executable_stack = EXSTACK_DISABLE_X;
706 break;
707 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
709 /* Some simple consistency checks for the interpreter */
710 if (elf_interpreter) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 retval = -ELIBBAD;
Andi Kleend20894a2008-02-08 04:21:54 -0800712 /* Not an ELF interpreter */
713 if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 goto out_free_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 /* Verify the interpreter has a valid arch */
Andi Kleend20894a2008-02-08 04:21:54 -0800716 if (!elf_check_arch(&loc->interp_elf_ex))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 goto out_free_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 }
719
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 /* Flush all traces of the currently running executable */
721 retval = flush_old_exec(bprm);
722 if (retval)
723 goto out_free_dentry;
724
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 /* OK, This is the point of no return */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 current->mm->def_flags = def_flags;
727
728 /* Do this immediately, since STACK_TOP as used in setup_arg_pages
729 may depend on the personality. */
Martin Schwidefsky0b592682008-10-16 15:39:57 +0200730 SET_PERSONALITY(loc->elf_ex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 if (elf_read_implies_exec(loc->elf_ex, executable_stack))
732 current->personality |= READ_IMPLIES_EXEC;
733
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700734 if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 current->flags |= PF_RANDOMIZE;
Linus Torvalds221af7f2010-01-28 22:14:42 -0800736
737 setup_new_exec(bprm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
739 /* Do this so that we can load the interpreter, if need be. We will
740 change some of these later */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP),
742 executable_stack);
743 if (retval < 0) {
744 send_sig(SIGKILL, current, 0);
745 goto out_free_dentry;
746 }
747
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 current->mm->start_stack = bprm->p;
749
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200750 /* Now we do a little grungy work by mmapping the ELF image into
Jiri Kosinacc503c12008-01-30 13:31:07 +0100751 the correct location in memory. */
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700752 for(i = 0, elf_ppnt = elf_phdata;
753 i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 int elf_prot = 0, elf_flags;
755 unsigned long k, vaddr;
756
757 if (elf_ppnt->p_type != PT_LOAD)
758 continue;
759
760 if (unlikely (elf_brk > elf_bss)) {
761 unsigned long nbyte;
762
763 /* There was a PT_LOAD segment with p_memsz > p_filesz
764 before this one. Map anonymous pages, if needed,
765 and clear the area. */
Mikael Petterssonf670d0e2011-01-12 17:00:02 -0800766 retval = set_brk(elf_bss + load_bias,
767 elf_brk + load_bias);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 if (retval) {
769 send_sig(SIGKILL, current, 0);
770 goto out_free_dentry;
771 }
772 nbyte = ELF_PAGEOFFSET(elf_bss);
773 if (nbyte) {
774 nbyte = ELF_MIN_ALIGN - nbyte;
775 if (nbyte > elf_brk - elf_bss)
776 nbyte = elf_brk - elf_bss;
777 if (clear_user((void __user *)elf_bss +
778 load_bias, nbyte)) {
779 /*
780 * This bss-zeroing can fail if the ELF
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700781 * file specifies odd protections. So
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 * we don't check the return value
783 */
784 }
785 }
786 }
787
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700788 if (elf_ppnt->p_flags & PF_R)
789 elf_prot |= PROT_READ;
790 if (elf_ppnt->p_flags & PF_W)
791 elf_prot |= PROT_WRITE;
792 if (elf_ppnt->p_flags & PF_X)
793 elf_prot |= PROT_EXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700795 elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
797 vaddr = elf_ppnt->p_vaddr;
798 if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
799 elf_flags |= MAP_FIXED;
800 } else if (loc->elf_ex.e_type == ET_DYN) {
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700801 /* Try and get dynamic programs out of the way of the
802 * default mmap base, as well as whatever program they
803 * might try to exec. This is because the brk will
804 * follow the loader, and is not movable. */
David Daneye39f5602012-01-10 15:10:21 -0800805#ifdef CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE
Jiri Kosinaa3defbe2011-11-02 13:37:41 -0700806 /* Memory randomization might have been switched off
Jiri Kosinac1d025e2013-04-30 15:27:45 -0700807 * in runtime via sysctl or explicit setting of
808 * personality flags.
Jiri Kosinaa3defbe2011-11-02 13:37:41 -0700809 * If that is the case, retain the original non-zero
810 * load_bias value in order to establish proper
811 * non-randomized mappings.
812 */
813 if (current->flags & PF_RANDOMIZE)
814 load_bias = 0;
815 else
816 load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
Jiri Kosinacc503c12008-01-30 13:31:07 +0100817#else
Linus Torvalds90cb28e2007-01-06 13:28:21 -0800818 load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
Jiri Kosinacc503c12008-01-30 13:31:07 +0100819#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 }
821
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700822 error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
Andrew Mortonbb1ad822008-01-30 13:31:07 +0100823 elf_prot, elf_flags, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 if (BAD_ADDR(error)) {
825 send_sig(SIGKILL, current, 0);
Alexey Kuznetsovb140f2512007-05-08 00:31:57 -0700826 retval = IS_ERR((void *)error) ?
827 PTR_ERR((void*)error) : -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 goto out_free_dentry;
829 }
830
831 if (!load_addr_set) {
832 load_addr_set = 1;
833 load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
834 if (loc->elf_ex.e_type == ET_DYN) {
835 load_bias += error -
836 ELF_PAGESTART(load_bias + vaddr);
837 load_addr += load_bias;
838 reloc_func_desc = load_bias;
839 }
840 }
841 k = elf_ppnt->p_vaddr;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700842 if (k < start_code)
843 start_code = k;
844 if (start_data < k)
845 start_data = k;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846
847 /*
848 * Check to see if the section's size will overflow the
849 * allowed task size. Note that p_filesz must always be
850 * <= p_memsz so it is only necessary to check p_memsz.
851 */
Chuck Ebbertce510592006-07-03 00:24:14 -0700852 if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 elf_ppnt->p_memsz > TASK_SIZE ||
854 TASK_SIZE - elf_ppnt->p_memsz < k) {
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700855 /* set_brk can never work. Avoid overflows. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 send_sig(SIGKILL, current, 0);
Alexey Kuznetsovb140f2512007-05-08 00:31:57 -0700857 retval = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 goto out_free_dentry;
859 }
860
861 k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
862
863 if (k > elf_bss)
864 elf_bss = k;
865 if ((elf_ppnt->p_flags & PF_X) && end_code < k)
866 end_code = k;
867 if (end_data < k)
868 end_data = k;
869 k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
870 if (k > elf_brk)
871 elf_brk = k;
872 }
873
874 loc->elf_ex.e_entry += load_bias;
875 elf_bss += load_bias;
876 elf_brk += load_bias;
877 start_code += load_bias;
878 end_code += load_bias;
879 start_data += load_bias;
880 end_data += load_bias;
881
882 /* Calling set_brk effectively mmaps the pages that we need
883 * for the bss and break sections. We must do this before
884 * mapping in the interpreter, to make sure it doesn't wind
885 * up getting placed where the bss needs to go.
886 */
887 retval = set_brk(elf_bss, elf_brk);
888 if (retval) {
889 send_sig(SIGKILL, current, 0);
890 goto out_free_dentry;
891 }
akpm@osdl.org6de50512005-10-11 08:29:08 -0700892 if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 send_sig(SIGSEGV, current, 0);
894 retval = -EFAULT; /* Nobody gets to see this, but.. */
895 goto out_free_dentry;
896 }
897
898 if (elf_interpreter) {
Alan Cox6eec4822012-10-04 17:13:42 -0700899 unsigned long interp_map_addr = 0;
Jiri Kosinacc503c12008-01-30 13:31:07 +0100900
Andi Kleend20894a2008-02-08 04:21:54 -0800901 elf_entry = load_elf_interp(&loc->interp_elf_ex,
902 interpreter,
903 &interp_map_addr,
904 load_bias);
905 if (!IS_ERR((void *)elf_entry)) {
906 /*
907 * load_elf_interp() returns relocation
908 * adjustment
909 */
910 interp_load_addr = elf_entry;
911 elf_entry += loc->interp_elf_ex.e_entry;
Jiri Kosinacc503c12008-01-30 13:31:07 +0100912 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913 if (BAD_ADDR(elf_entry)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 force_sig(SIGSEGV, current);
Chuck Ebbertce510592006-07-03 00:24:14 -0700915 retval = IS_ERR((void *)elf_entry) ?
916 (int)elf_entry : -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 goto out_free_dentry;
918 }
919 reloc_func_desc = interp_load_addr;
920
921 allow_write_access(interpreter);
922 fput(interpreter);
923 kfree(elf_interpreter);
924 } else {
925 elf_entry = loc->elf_ex.e_entry;
Suresh Siddha5342fba2006-02-26 04:18:28 +0100926 if (BAD_ADDR(elf_entry)) {
Chuck Ebbertce510592006-07-03 00:24:14 -0700927 force_sig(SIGSEGV, current);
928 retval = -EINVAL;
Suresh Siddha5342fba2006-02-26 04:18:28 +0100929 goto out_free_dentry;
930 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 }
932
933 kfree(elf_phdata);
934
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 set_binfmt(&elf_format);
936
Benjamin Herrenschmidt547ee842005-04-16 15:24:35 -0700937#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
Martin Schwidefskyfc5243d2008-12-25 13:38:35 +0100938 retval = arch_setup_additional_pages(bprm, !!elf_interpreter);
Benjamin Herrenschmidt547ee842005-04-16 15:24:35 -0700939 if (retval < 0) {
940 send_sig(SIGKILL, current, 0);
Roland McGrath18c8baf2005-04-28 15:17:19 -0700941 goto out;
Benjamin Herrenschmidt547ee842005-04-16 15:24:35 -0700942 }
943#endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
944
David Howellsa6f76f22008-11-14 10:39:24 +1100945 install_exec_creds(bprm);
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700946 retval = create_elf_tables(bprm, &loc->elf_ex,
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700947 load_addr, interp_load_addr);
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700948 if (retval < 0) {
949 send_sig(SIGKILL, current, 0);
950 goto out;
951 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 /* N.B. passed_fileno might not be initialized? */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 current->mm->end_code = end_code;
954 current->mm->start_code = start_code;
955 current->mm->start_data = start_data;
956 current->mm->end_data = end_data;
957 current->mm->start_stack = bprm->p;
958
Jiri Kosinac1d171a2008-01-30 13:30:40 +0100959#ifdef arch_randomize_brk
Jiri Kosina4471a672011-04-14 15:22:09 -0700960 if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) {
Jiri Kosinac1d171a2008-01-30 13:30:40 +0100961 current->mm->brk = current->mm->start_brk =
962 arch_randomize_brk(current->mm);
Jiri Kosina4471a672011-04-14 15:22:09 -0700963#ifdef CONFIG_COMPAT_BRK
964 current->brk_randomized = 1;
965#endif
966 }
Jiri Kosinac1d171a2008-01-30 13:30:40 +0100967#endif
968
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 if (current->personality & MMAP_PAGE_ZERO) {
970 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
971 and some applications "depend" upon this behavior.
972 Since we do not have the power to recompile these, we
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700973 emulate the SVr4 behavior. Sigh. */
Linus Torvalds6be5ceb2012-04-20 17:13:58 -0700974 error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 MAP_FIXED | MAP_PRIVATE, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 }
977
978#ifdef ELF_PLAT_INIT
979 /*
980 * The ABI may specify that certain registers be set up in special
981 * ways (on i386 %edx is the address of a DT_FINI function, for
982 * example. In addition, it may also specify (eg, PowerPC64 ELF)
983 * that the e_entry field is the address of the function descriptor
984 * for the startup routine, rather than the address of the startup
985 * routine itself. This macro performs whatever initialization to
986 * the regs structure is required as well as any relocations to the
987 * function descriptor entries when executing dynamically links apps.
988 */
989 ELF_PLAT_INIT(regs, reloc_func_desc);
990#endif
991
992 start_thread(regs, elf_entry, bprm->p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 retval = 0;
994out:
995 kfree(loc);
996out_ret:
997 return retval;
998
999 /* error cleanup */
1000out_free_dentry:
1001 allow_write_access(interpreter);
1002 if (interpreter)
1003 fput(interpreter);
1004out_free_interp:
Jesper Juhlf99d49a2005-11-07 01:01:34 -08001005 kfree(elf_interpreter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006out_free_ph:
1007 kfree(elf_phdata);
1008 goto out;
1009}
1010
1011/* This is really simpleminded and specialized - we are loading an
1012 a.out library that is given an ELF header. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013static int load_elf_library(struct file *file)
1014{
1015 struct elf_phdr *elf_phdata;
1016 struct elf_phdr *eppnt;
1017 unsigned long elf_bss, bss, len;
1018 int retval, error, i, j;
1019 struct elfhdr elf_ex;
1020
1021 error = -ENOEXEC;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001022 retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 if (retval != sizeof(elf_ex))
1024 goto out;
1025
1026 if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
1027 goto out;
1028
1029 /* First of all, some simple consistency checks */
1030 if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001031 !elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 goto out;
1033
1034 /* Now read in all of the header information */
1035
1036 j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
1037 /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */
1038
1039 error = -ENOMEM;
1040 elf_phdata = kmalloc(j, GFP_KERNEL);
1041 if (!elf_phdata)
1042 goto out;
1043
1044 eppnt = elf_phdata;
1045 error = -ENOEXEC;
1046 retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j);
1047 if (retval != j)
1048 goto out_free_ph;
1049
1050 for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
1051 if ((eppnt + i)->p_type == PT_LOAD)
1052 j++;
1053 if (j != 1)
1054 goto out_free_ph;
1055
1056 while (eppnt->p_type != PT_LOAD)
1057 eppnt++;
1058
1059 /* Now use mmap to map the library into memory. */
Linus Torvalds6be5ceb2012-04-20 17:13:58 -07001060 error = vm_mmap(file,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 ELF_PAGESTART(eppnt->p_vaddr),
1062 (eppnt->p_filesz +
1063 ELF_PAGEOFFSET(eppnt->p_vaddr)),
1064 PROT_READ | PROT_WRITE | PROT_EXEC,
1065 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
1066 (eppnt->p_offset -
1067 ELF_PAGEOFFSET(eppnt->p_vaddr)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 if (error != ELF_PAGESTART(eppnt->p_vaddr))
1069 goto out_free_ph;
1070
1071 elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
1072 if (padzero(elf_bss)) {
1073 error = -EFAULT;
1074 goto out_free_ph;
1075 }
1076
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001077 len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr +
1078 ELF_MIN_ALIGN - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 bss = eppnt->p_memsz + eppnt->p_vaddr;
Linus Torvaldse4eb1ff2012-04-20 15:35:40 -07001080 if (bss > len)
1081 vm_brk(len, bss - len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 error = 0;
1083
1084out_free_ph:
1085 kfree(elf_phdata);
1086out:
1087 return error;
1088}
1089
Christoph Hellwig698ba7b2009-12-15 16:47:37 -08001090#ifdef CONFIG_ELF_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091/*
1092 * ELF core dumper
1093 *
1094 * Modelled on fs/exec.c:aout_core_dump()
1095 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1096 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097
1098/*
Jason Baron909af762012-03-23 15:02:51 -07001099 * The purpose of always_dump_vma() is to make sure that special kernel mappings
1100 * that are useful for post-mortem analysis are included in every core dump.
1101 * In that way we ensure that the core dump is fully interpretable later
1102 * without matching up the same kernel and hardware config to see what PC values
1103 * meant. These special mappings include - vDSO, vsyscall, and other
1104 * architecture specific mappings
1105 */
1106static bool always_dump_vma(struct vm_area_struct *vma)
1107{
1108 /* Any vsyscall mappings? */
1109 if (vma == get_gate_vma(vma->vm_mm))
1110 return true;
1111 /*
1112 * arch_vma_name() returns non-NULL for special architecture mappings,
1113 * such as vDSO sections.
1114 */
1115 if (arch_vma_name(vma))
1116 return true;
1117
1118 return false;
1119}
1120
1121/*
Roland McGrath82df3972007-10-16 23:27:02 -07001122 * Decide what to dump of a segment, part, all or none.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 */
Roland McGrath82df3972007-10-16 23:27:02 -07001124static unsigned long vma_dump_size(struct vm_area_struct *vma,
1125 unsigned long mm_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126{
KOSAKI Motohiroe575f112008-10-18 20:27:08 -07001127#define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type))
1128
Jason Baron909af762012-03-23 15:02:51 -07001129 /* always dump the vdso and vsyscall sections */
1130 if (always_dump_vma(vma))
Roland McGrath82df3972007-10-16 23:27:02 -07001131 goto whole;
Roland McGrathe5b97dd2007-01-26 00:56:48 -08001132
Konstantin Khlebnikov0103bd12012-10-08 16:28:59 -07001133 if (vma->vm_flags & VM_DONTDUMP)
Jason Baronaccb61f2012-03-23 15:02:51 -07001134 return 0;
1135
KOSAKI Motohiroe575f112008-10-18 20:27:08 -07001136 /* Hugetlb memory check */
1137 if (vma->vm_flags & VM_HUGETLB) {
1138 if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED))
1139 goto whole;
1140 if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE))
1141 goto whole;
Naoya Horiguchi23d9e482013-04-17 15:58:28 -07001142 return 0;
KOSAKI Motohiroe575f112008-10-18 20:27:08 -07001143 }
1144
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145 /* Do not dump I/O mapped devices or special mappings */
Konstantin Khlebnikov314e51b2012-10-08 16:29:02 -07001146 if (vma->vm_flags & VM_IO)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 return 0;
1148
Kawai, Hidehiroa1b59e82007-07-19 01:48:29 -07001149 /* By default, dump shared memory if mapped from an anonymous file. */
1150 if (vma->vm_flags & VM_SHARED) {
Al Viro496ad9a2013-01-23 17:07:38 -05001151 if (file_inode(vma->vm_file)->i_nlink == 0 ?
Roland McGrath82df3972007-10-16 23:27:02 -07001152 FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED))
1153 goto whole;
1154 return 0;
Kawai, Hidehiroa1b59e82007-07-19 01:48:29 -07001155 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156
Roland McGrath82df3972007-10-16 23:27:02 -07001157 /* Dump segments that have been written to. */
1158 if (vma->anon_vma && FILTER(ANON_PRIVATE))
1159 goto whole;
1160 if (vma->vm_file == NULL)
1161 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
Roland McGrath82df3972007-10-16 23:27:02 -07001163 if (FILTER(MAPPED_PRIVATE))
1164 goto whole;
1165
1166 /*
1167 * If this looks like the beginning of a DSO or executable mapping,
1168 * check for an ELF header. If we find one, dump the first page to
1169 * aid in determining what was mapped here.
1170 */
Roland McGrath92dc07b2009-02-06 17:34:07 -08001171 if (FILTER(ELF_HEADERS) &&
1172 vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) {
Roland McGrath82df3972007-10-16 23:27:02 -07001173 u32 __user *header = (u32 __user *) vma->vm_start;
1174 u32 word;
Roland McGrath92dc07b2009-02-06 17:34:07 -08001175 mm_segment_t fs = get_fs();
Roland McGrath82df3972007-10-16 23:27:02 -07001176 /*
1177 * Doing it this way gets the constant folded by GCC.
1178 */
1179 union {
1180 u32 cmp;
1181 char elfmag[SELFMAG];
1182 } magic;
1183 BUILD_BUG_ON(SELFMAG != sizeof word);
1184 magic.elfmag[EI_MAG0] = ELFMAG0;
1185 magic.elfmag[EI_MAG1] = ELFMAG1;
1186 magic.elfmag[EI_MAG2] = ELFMAG2;
1187 magic.elfmag[EI_MAG3] = ELFMAG3;
Roland McGrath92dc07b2009-02-06 17:34:07 -08001188 /*
1189 * Switch to the user "segment" for get_user(),
1190 * then put back what elf_core_dump() had in place.
1191 */
1192 set_fs(USER_DS);
1193 if (unlikely(get_user(word, header)))
1194 word = 0;
1195 set_fs(fs);
1196 if (word == magic.cmp)
Roland McGrath82df3972007-10-16 23:27:02 -07001197 return PAGE_SIZE;
1198 }
1199
1200#undef FILTER
1201
1202 return 0;
1203
1204whole:
1205 return vma->vm_end - vma->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206}
1207
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208/* An ELF note in memory */
1209struct memelfnote
1210{
1211 const char *name;
1212 int type;
1213 unsigned int datasz;
1214 void *data;
1215};
1216
1217static int notesize(struct memelfnote *en)
1218{
1219 int sz;
1220
1221 sz = sizeof(struct elf_note);
1222 sz += roundup(strlen(en->name) + 1, 4);
1223 sz += roundup(en->datasz, 4);
1224
1225 return sz;
1226}
1227
Andi Kleend025c9d2006-09-30 23:29:28 -07001228#define DUMP_WRITE(addr, nr, foffset) \
1229 do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230
Andi Kleend025c9d2006-09-30 23:29:28 -07001231static int alignfile(struct file *file, loff_t *foffset)
1232{
Petr Vandroveca7a0d862006-10-13 18:42:07 +02001233 static const char buf[4] = { 0, };
Andi Kleend025c9d2006-09-30 23:29:28 -07001234 DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset);
1235 return 1;
1236}
1237
1238static int writenote(struct memelfnote *men, struct file *file,
1239 loff_t *foffset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240{
1241 struct elf_note en;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 en.n_namesz = strlen(men->name) + 1;
1243 en.n_descsz = men->datasz;
1244 en.n_type = men->type;
1245
Andi Kleend025c9d2006-09-30 23:29:28 -07001246 DUMP_WRITE(&en, sizeof(en), foffset);
1247 DUMP_WRITE(men->name, en.n_namesz, foffset);
1248 if (!alignfile(file, foffset))
1249 return 0;
1250 DUMP_WRITE(men->data, men->datasz, foffset);
1251 if (!alignfile(file, foffset))
1252 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253
1254 return 1;
1255}
1256#undef DUMP_WRITE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257
Roland McGrath3aba4812008-01-30 13:31:44 +01001258static void fill_elf_header(struct elfhdr *elf, int segs,
Zhang Yanfeid3330cf2013-02-21 16:44:20 -08001259 u16 machine, u32 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260{
Cyrill Gorcunov6970c8e2008-04-29 01:01:18 -07001261 memset(elf, 0, sizeof(*elf));
1262
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1264 elf->e_ident[EI_CLASS] = ELF_CLASS;
1265 elf->e_ident[EI_DATA] = ELF_DATA;
1266 elf->e_ident[EI_VERSION] = EV_CURRENT;
1267 elf->e_ident[EI_OSABI] = ELF_OSABI;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268
1269 elf->e_type = ET_CORE;
Roland McGrath3aba4812008-01-30 13:31:44 +01001270 elf->e_machine = machine;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 elf->e_version = EV_CURRENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 elf->e_phoff = sizeof(struct elfhdr);
Roland McGrath3aba4812008-01-30 13:31:44 +01001273 elf->e_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 elf->e_ehsize = sizeof(struct elfhdr);
1275 elf->e_phentsize = sizeof(struct elf_phdr);
1276 elf->e_phnum = segs;
Cyrill Gorcunov6970c8e2008-04-29 01:01:18 -07001277
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 return;
1279}
1280
Andrew Morton8d6b5eee2006-09-25 23:32:04 -07001281static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282{
1283 phdr->p_type = PT_NOTE;
1284 phdr->p_offset = offset;
1285 phdr->p_vaddr = 0;
1286 phdr->p_paddr = 0;
1287 phdr->p_filesz = sz;
1288 phdr->p_memsz = 0;
1289 phdr->p_flags = 0;
1290 phdr->p_align = 0;
1291 return;
1292}
1293
1294static void fill_note(struct memelfnote *note, const char *name, int type,
1295 unsigned int sz, void *data)
1296{
1297 note->name = name;
1298 note->type = type;
1299 note->datasz = sz;
1300 note->data = data;
1301 return;
1302}
1303
1304/*
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001305 * fill up all the fields in prstatus from the given task struct, except
1306 * registers which need to be filled up separately.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 */
1308static void fill_prstatus(struct elf_prstatus *prstatus,
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001309 struct task_struct *p, long signr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310{
1311 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1312 prstatus->pr_sigpend = p->pending.signal.sig[0];
1313 prstatus->pr_sighold = p->blocked.sig[0];
Oleg Nesterov3b34fc52009-06-17 16:27:38 -07001314 rcu_read_lock();
1315 prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1316 rcu_read_unlock();
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001317 prstatus->pr_pid = task_pid_vnr(p);
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001318 prstatus->pr_pgrp = task_pgrp_vnr(p);
1319 prstatus->pr_sid = task_session_vnr(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 if (thread_group_leader(p)) {
Frank Mayharf06febc2008-09-12 09:54:39 -07001321 struct task_cputime cputime;
1322
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 /*
Frank Mayharf06febc2008-09-12 09:54:39 -07001324 * This is the record for the group leader. It shows the
1325 * group-wide total, not its individual thread total.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 */
Frank Mayharf06febc2008-09-12 09:54:39 -07001327 thread_group_cputime(p, &cputime);
1328 cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
1329 cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 } else {
Frederic Weisbecker6fac4822012-11-13 14:20:55 +01001331 cputime_t utime, stime;
1332
1333 task_cputime(p, &utime, &stime);
1334 cputime_to_timeval(utime, &prstatus->pr_utime);
1335 cputime_to_timeval(stime, &prstatus->pr_stime);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 }
1337 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1338 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1339}
1340
1341static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1342 struct mm_struct *mm)
1343{
David Howellsc69e8d92008-11-14 10:39:19 +11001344 const struct cred *cred;
Greg Kroah-Hartmana84a5052005-05-11 00:10:44 -07001345 unsigned int i, len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346
1347 /* first copy the parameters from user space */
1348 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1349
1350 len = mm->arg_end - mm->arg_start;
1351 if (len >= ELF_PRARGSZ)
1352 len = ELF_PRARGSZ-1;
1353 if (copy_from_user(&psinfo->pr_psargs,
1354 (const char __user *)mm->arg_start, len))
1355 return -EFAULT;
1356 for(i = 0; i < len; i++)
1357 if (psinfo->pr_psargs[i] == 0)
1358 psinfo->pr_psargs[i] = ' ';
1359 psinfo->pr_psargs[len] = 0;
1360
Oleg Nesterov3b34fc52009-06-17 16:27:38 -07001361 rcu_read_lock();
1362 psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1363 rcu_read_unlock();
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001364 psinfo->pr_pid = task_pid_vnr(p);
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001365 psinfo->pr_pgrp = task_pgrp_vnr(p);
1366 psinfo->pr_sid = task_session_vnr(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367
1368 i = p->state ? ffz(~p->state) + 1 : 0;
1369 psinfo->pr_state = i;
Carsten Otte55148542006-03-25 03:08:22 -08001370 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1372 psinfo->pr_nice = task_nice(p);
1373 psinfo->pr_flag = p->flags;
David Howellsc69e8d92008-11-14 10:39:19 +11001374 rcu_read_lock();
1375 cred = __task_cred(p);
Eric W. Biedermanebc887b2012-02-07 18:36:10 -08001376 SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
1377 SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
David Howellsc69e8d92008-11-14 10:39:19 +11001378 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1380
1381 return 0;
1382}
1383
Roland McGrath3aba4812008-01-30 13:31:44 +01001384static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm)
1385{
1386 elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv;
1387 int i = 0;
1388 do
1389 i += 2;
1390 while (auxv[i - 2] != AT_NULL);
1391 fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);
1392}
1393
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001394static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata,
1395 siginfo_t *siginfo)
1396{
1397 mm_segment_t old_fs = get_fs();
1398 set_fs(KERNEL_DS);
1399 copy_siginfo_to_user((user_siginfo_t __user *) csigdata, siginfo);
1400 set_fs(old_fs);
1401 fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata);
1402}
1403
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001404#define MAX_FILE_NOTE_SIZE (4*1024*1024)
1405/*
1406 * Format of NT_FILE note:
1407 *
1408 * long count -- how many files are mapped
1409 * long page_size -- units for file_ofs
1410 * array of [COUNT] elements of
1411 * long start
1412 * long end
1413 * long file_ofs
1414 * followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL...
1415 */
1416static void fill_files_note(struct memelfnote *note)
1417{
1418 struct vm_area_struct *vma;
1419 unsigned count, size, names_ofs, remaining, n;
1420 user_long_t *data;
1421 user_long_t *start_end_ofs;
1422 char *name_base, *name_curpos;
1423
1424 /* *Estimated* file count and total data size needed */
1425 count = current->mm->map_count;
1426 size = count * 64;
1427
1428 names_ofs = (2 + 3 * count) * sizeof(data[0]);
1429 alloc:
1430 if (size >= MAX_FILE_NOTE_SIZE) /* paranoia check */
1431 goto err;
1432 size = round_up(size, PAGE_SIZE);
1433 data = vmalloc(size);
1434 if (!data)
1435 goto err;
1436
1437 start_end_ofs = data + 2;
1438 name_base = name_curpos = ((char *)data) + names_ofs;
1439 remaining = size - names_ofs;
1440 count = 0;
1441 for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
1442 struct file *file;
1443 const char *filename;
1444
1445 file = vma->vm_file;
1446 if (!file)
1447 continue;
1448 filename = d_path(&file->f_path, name_curpos, remaining);
1449 if (IS_ERR(filename)) {
1450 if (PTR_ERR(filename) == -ENAMETOOLONG) {
1451 vfree(data);
1452 size = size * 5 / 4;
1453 goto alloc;
1454 }
1455 continue;
1456 }
1457
1458 /* d_path() fills at the end, move name down */
1459 /* n = strlen(filename) + 1: */
1460 n = (name_curpos + remaining) - filename;
1461 remaining = filename - name_curpos;
1462 memmove(name_curpos, filename, n);
1463 name_curpos += n;
1464
1465 *start_end_ofs++ = vma->vm_start;
1466 *start_end_ofs++ = vma->vm_end;
1467 *start_end_ofs++ = vma->vm_pgoff;
1468 count++;
1469 }
1470
1471 /* Now we know exact count of files, can store it */
1472 data[0] = count;
1473 data[1] = PAGE_SIZE;
1474 /*
1475 * Count usually is less than current->mm->map_count,
1476 * we need to move filenames down.
1477 */
1478 n = current->mm->map_count - count;
1479 if (n != 0) {
1480 unsigned shift_bytes = n * 3 * sizeof(data[0]);
1481 memmove(name_base - shift_bytes, name_base,
1482 name_curpos - name_base);
1483 name_curpos -= shift_bytes;
1484 }
1485
1486 size = name_curpos - (char *)data;
1487 fill_note(note, "CORE", NT_FILE, size, data);
1488 err: ;
1489}
1490
Roland McGrath4206d3a2008-01-30 13:31:45 +01001491#ifdef CORE_DUMP_USE_REGSET
1492#include <linux/regset.h>
1493
1494struct elf_thread_core_info {
1495 struct elf_thread_core_info *next;
1496 struct task_struct *task;
1497 struct elf_prstatus prstatus;
1498 struct memelfnote notes[0];
1499};
1500
1501struct elf_note_info {
1502 struct elf_thread_core_info *thread;
1503 struct memelfnote psinfo;
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001504 struct memelfnote signote;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001505 struct memelfnote auxv;
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001506 struct memelfnote files;
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001507 user_siginfo_t csigdata;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001508 size_t size;
1509 int thread_notes;
1510};
1511
Roland McGrathd31472b2008-03-04 14:28:30 -08001512/*
1513 * When a regset has a writeback hook, we call it on each thread before
1514 * dumping user memory. On register window machines, this makes sure the
1515 * user memory backing the register data is up to date before we read it.
1516 */
1517static void do_thread_regset_writeback(struct task_struct *task,
1518 const struct user_regset *regset)
1519{
1520 if (regset->writeback)
1521 regset->writeback(task, regset, 1);
1522}
1523
H. J. Lu0953f65d2012-02-14 13:34:52 -08001524#ifndef PR_REG_SIZE
1525#define PR_REG_SIZE(S) sizeof(S)
1526#endif
1527
1528#ifndef PRSTATUS_SIZE
1529#define PRSTATUS_SIZE(S) sizeof(S)
1530#endif
1531
1532#ifndef PR_REG_PTR
1533#define PR_REG_PTR(S) (&((S)->pr_reg))
1534#endif
1535
1536#ifndef SET_PR_FPVALID
1537#define SET_PR_FPVALID(S, V) ((S)->pr_fpvalid = (V))
1538#endif
1539
Roland McGrath4206d3a2008-01-30 13:31:45 +01001540static int fill_thread_core_info(struct elf_thread_core_info *t,
1541 const struct user_regset_view *view,
1542 long signr, size_t *total)
1543{
1544 unsigned int i;
1545
1546 /*
1547 * NT_PRSTATUS is the one special case, because the regset data
1548 * goes into the pr_reg field inside the note contents, rather
1549 * than being the whole note contents. We fill the reset in here.
1550 * We assume that regset 0 is NT_PRSTATUS.
1551 */
1552 fill_prstatus(&t->prstatus, t->task, signr);
1553 (void) view->regsets[0].get(t->task, &view->regsets[0],
H. J. Lu0953f65d2012-02-14 13:34:52 -08001554 0, PR_REG_SIZE(t->prstatus.pr_reg),
1555 PR_REG_PTR(&t->prstatus), NULL);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001556
1557 fill_note(&t->notes[0], "CORE", NT_PRSTATUS,
H. J. Lu0953f65d2012-02-14 13:34:52 -08001558 PRSTATUS_SIZE(t->prstatus), &t->prstatus);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001559 *total += notesize(&t->notes[0]);
1560
Roland McGrathd31472b2008-03-04 14:28:30 -08001561 do_thread_regset_writeback(t->task, &view->regsets[0]);
1562
Roland McGrath4206d3a2008-01-30 13:31:45 +01001563 /*
1564 * Each other regset might generate a note too. For each regset
1565 * that has no core_note_type or is inactive, we leave t->notes[i]
1566 * all zero and we'll know to skip writing it later.
1567 */
1568 for (i = 1; i < view->n; ++i) {
1569 const struct user_regset *regset = &view->regsets[i];
Roland McGrathd31472b2008-03-04 14:28:30 -08001570 do_thread_regset_writeback(t->task, regset);
H. Peter Anvinc8e25252012-03-02 10:43:48 -08001571 if (regset->core_note_type && regset->get &&
Roland McGrath4206d3a2008-01-30 13:31:45 +01001572 (!regset->active || regset->active(t->task, regset))) {
1573 int ret;
1574 size_t size = regset->n * regset->size;
1575 void *data = kmalloc(size, GFP_KERNEL);
1576 if (unlikely(!data))
1577 return 0;
1578 ret = regset->get(t->task, regset,
1579 0, size, data, NULL);
1580 if (unlikely(ret))
1581 kfree(data);
1582 else {
1583 if (regset->core_note_type != NT_PRFPREG)
1584 fill_note(&t->notes[i], "LINUX",
1585 regset->core_note_type,
1586 size, data);
1587 else {
H. J. Lu0953f65d2012-02-14 13:34:52 -08001588 SET_PR_FPVALID(&t->prstatus, 1);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001589 fill_note(&t->notes[i], "CORE",
1590 NT_PRFPREG, size, data);
1591 }
1592 *total += notesize(&t->notes[i]);
1593 }
1594 }
1595 }
1596
1597 return 1;
1598}
1599
1600static int fill_note_info(struct elfhdr *elf, int phdrs,
1601 struct elf_note_info *info,
Denys Vlasenko5ab1c302012-10-04 17:15:29 -07001602 siginfo_t *siginfo, struct pt_regs *regs)
Roland McGrath4206d3a2008-01-30 13:31:45 +01001603{
1604 struct task_struct *dump_task = current;
1605 const struct user_regset_view *view = task_user_regset_view(dump_task);
1606 struct elf_thread_core_info *t;
1607 struct elf_prpsinfo *psinfo;
Oleg Nesterov83914442008-07-25 01:47:45 -07001608 struct core_thread *ct;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001609 unsigned int i;
1610
1611 info->size = 0;
1612 info->thread = NULL;
1613
1614 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
Alan Cox6899e922012-12-17 16:02:09 -08001615 if (psinfo == NULL) {
1616 info->psinfo.data = NULL; /* So we don't free this wrongly */
Roland McGrath4206d3a2008-01-30 13:31:45 +01001617 return 0;
Alan Cox6899e922012-12-17 16:02:09 -08001618 }
Roland McGrath4206d3a2008-01-30 13:31:45 +01001619
Amerigo Wange2dbe122009-07-01 01:06:26 -04001620 fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1621
Roland McGrath4206d3a2008-01-30 13:31:45 +01001622 /*
1623 * Figure out how many notes we're going to need for each thread.
1624 */
1625 info->thread_notes = 0;
1626 for (i = 0; i < view->n; ++i)
1627 if (view->regsets[i].core_note_type != 0)
1628 ++info->thread_notes;
1629
1630 /*
1631 * Sanity check. We rely on regset 0 being in NT_PRSTATUS,
1632 * since it is our one special case.
1633 */
1634 if (unlikely(info->thread_notes == 0) ||
1635 unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) {
1636 WARN_ON(1);
1637 return 0;
1638 }
1639
1640 /*
1641 * Initialize the ELF file header.
1642 */
1643 fill_elf_header(elf, phdrs,
Zhang Yanfeid3330cf2013-02-21 16:44:20 -08001644 view->e_machine, view->e_flags);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001645
1646 /*
1647 * Allocate a structure for each thread.
1648 */
Oleg Nesterov83914442008-07-25 01:47:45 -07001649 for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) {
1650 t = kzalloc(offsetof(struct elf_thread_core_info,
1651 notes[info->thread_notes]),
1652 GFP_KERNEL);
1653 if (unlikely(!t))
1654 return 0;
Oleg Nesterov24d52882008-07-25 01:47:40 -07001655
Oleg Nesterov83914442008-07-25 01:47:45 -07001656 t->task = ct->task;
1657 if (ct->task == dump_task || !info->thread) {
1658 t->next = info->thread;
1659 info->thread = t;
1660 } else {
1661 /*
1662 * Make sure to keep the original task at
1663 * the head of the list.
1664 */
1665 t->next = info->thread->next;
1666 info->thread->next = t;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001667 }
Oleg Nesterov83914442008-07-25 01:47:45 -07001668 }
Roland McGrath4206d3a2008-01-30 13:31:45 +01001669
1670 /*
1671 * Now fill in each thread's information.
1672 */
1673 for (t = info->thread; t != NULL; t = t->next)
Denys Vlasenko5ab1c302012-10-04 17:15:29 -07001674 if (!fill_thread_core_info(t, view, siginfo->si_signo, &info->size))
Roland McGrath4206d3a2008-01-30 13:31:45 +01001675 return 0;
1676
1677 /*
1678 * Fill in the two process-wide notes.
1679 */
1680 fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm);
1681 info->size += notesize(&info->psinfo);
1682
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001683 fill_siginfo_note(&info->signote, &info->csigdata, siginfo);
1684 info->size += notesize(&info->signote);
1685
Roland McGrath4206d3a2008-01-30 13:31:45 +01001686 fill_auxv_note(&info->auxv, current->mm);
1687 info->size += notesize(&info->auxv);
1688
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001689 fill_files_note(&info->files);
1690 info->size += notesize(&info->files);
1691
Roland McGrath4206d3a2008-01-30 13:31:45 +01001692 return 1;
1693}
1694
1695static size_t get_note_info_size(struct elf_note_info *info)
1696{
1697 return info->size;
1698}
1699
1700/*
1701 * Write all the notes for each thread. When writing the first thread, the
1702 * process-wide notes are interleaved after the first thread-specific note.
1703 */
1704static int write_note_info(struct elf_note_info *info,
1705 struct file *file, loff_t *foffset)
1706{
1707 bool first = 1;
1708 struct elf_thread_core_info *t = info->thread;
1709
1710 do {
1711 int i;
1712
1713 if (!writenote(&t->notes[0], file, foffset))
1714 return 0;
1715
1716 if (first && !writenote(&info->psinfo, file, foffset))
1717 return 0;
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001718 if (first && !writenote(&info->signote, file, foffset))
1719 return 0;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001720 if (first && !writenote(&info->auxv, file, foffset))
1721 return 0;
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001722 if (first && !writenote(&info->files, file, foffset))
1723 return 0;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001724
1725 for (i = 1; i < info->thread_notes; ++i)
1726 if (t->notes[i].data &&
1727 !writenote(&t->notes[i], file, foffset))
1728 return 0;
1729
1730 first = 0;
1731 t = t->next;
1732 } while (t);
1733
1734 return 1;
1735}
1736
1737static void free_note_info(struct elf_note_info *info)
1738{
1739 struct elf_thread_core_info *threads = info->thread;
1740 while (threads) {
1741 unsigned int i;
1742 struct elf_thread_core_info *t = threads;
1743 threads = t->next;
1744 WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus);
1745 for (i = 1; i < info->thread_notes; ++i)
1746 kfree(t->notes[i].data);
1747 kfree(t);
1748 }
1749 kfree(info->psinfo.data);
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001750 vfree(info->files.data);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001751}
1752
1753#else
1754
Linus Torvalds1da177e2005-04-16 15:20:36 -07001755/* Here is the structure in which status of each thread is captured. */
1756struct elf_thread_status
1757{
1758 struct list_head list;
1759 struct elf_prstatus prstatus; /* NT_PRSTATUS */
1760 elf_fpregset_t fpu; /* NT_PRFPREG */
1761 struct task_struct *thread;
1762#ifdef ELF_CORE_COPY_XFPREGS
Mark Nelson5b20cd82007-10-16 23:25:39 -07001763 elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764#endif
1765 struct memelfnote notes[3];
1766 int num_notes;
1767};
1768
1769/*
1770 * In order to add the specific thread information for the elf file format,
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001771 * we need to keep a linked list of every threads pr_status and then create
1772 * a single section for them in the final core file.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773 */
1774static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1775{
1776 int sz = 0;
1777 struct task_struct *p = t->thread;
1778 t->num_notes = 0;
1779
1780 fill_prstatus(&t->prstatus, p, signr);
1781 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1782
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001783 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1784 &(t->prstatus));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785 t->num_notes++;
1786 sz += notesize(&t->notes[0]);
1787
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001788 if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL,
1789 &t->fpu))) {
1790 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1791 &(t->fpu));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792 t->num_notes++;
1793 sz += notesize(&t->notes[1]);
1794 }
1795
1796#ifdef ELF_CORE_COPY_XFPREGS
1797 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
Mark Nelson5b20cd82007-10-16 23:25:39 -07001798 fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
1799 sizeof(t->xfpu), &t->xfpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 t->num_notes++;
1801 sz += notesize(&t->notes[2]);
1802 }
1803#endif
1804 return sz;
1805}
1806
Roland McGrath3aba4812008-01-30 13:31:44 +01001807struct elf_note_info {
1808 struct memelfnote *notes;
1809 struct elf_prstatus *prstatus; /* NT_PRSTATUS */
1810 struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */
1811 struct list_head thread_list;
1812 elf_fpregset_t *fpu;
1813#ifdef ELF_CORE_COPY_XFPREGS
1814 elf_fpxregset_t *xfpu;
1815#endif
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001816 user_siginfo_t csigdata;
Roland McGrath3aba4812008-01-30 13:31:44 +01001817 int thread_status_size;
1818 int numnote;
1819};
1820
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001821static int elf_note_info_init(struct elf_note_info *info)
Roland McGrath3aba4812008-01-30 13:31:44 +01001822{
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001823 memset(info, 0, sizeof(*info));
Roland McGrath3aba4812008-01-30 13:31:44 +01001824 INIT_LIST_HEAD(&info->thread_list);
1825
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001826 /* Allocate space for ELF notes */
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001827 info->notes = kmalloc(8 * sizeof(struct memelfnote), GFP_KERNEL);
Roland McGrath3aba4812008-01-30 13:31:44 +01001828 if (!info->notes)
1829 return 0;
1830 info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
1831 if (!info->psinfo)
Denys Vlasenkof34f9d12012-09-26 11:34:50 +10001832 return 0;
Roland McGrath3aba4812008-01-30 13:31:44 +01001833 info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL);
1834 if (!info->prstatus)
Denys Vlasenkof34f9d12012-09-26 11:34:50 +10001835 return 0;
Roland McGrath3aba4812008-01-30 13:31:44 +01001836 info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
1837 if (!info->fpu)
Denys Vlasenkof34f9d12012-09-26 11:34:50 +10001838 return 0;
Roland McGrath3aba4812008-01-30 13:31:44 +01001839#ifdef ELF_CORE_COPY_XFPREGS
1840 info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL);
1841 if (!info->xfpu)
Denys Vlasenkof34f9d12012-09-26 11:34:50 +10001842 return 0;
Roland McGrath3aba4812008-01-30 13:31:44 +01001843#endif
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001844 return 1;
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001845}
Roland McGrath3aba4812008-01-30 13:31:44 +01001846
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001847static int fill_note_info(struct elfhdr *elf, int phdrs,
1848 struct elf_note_info *info,
Denys Vlasenko5ab1c302012-10-04 17:15:29 -07001849 siginfo_t *siginfo, struct pt_regs *regs)
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001850{
1851 struct list_head *t;
1852
1853 if (!elf_note_info_init(info))
1854 return 0;
1855
Denys Vlasenko5ab1c302012-10-04 17:15:29 -07001856 if (siginfo->si_signo) {
Oleg Nesterov83914442008-07-25 01:47:45 -07001857 struct core_thread *ct;
WANG Cong4220b7f2008-04-29 01:01:18 -07001858 struct elf_thread_status *ets;
Oleg Nesterov24d52882008-07-25 01:47:40 -07001859
Oleg Nesterov83914442008-07-25 01:47:45 -07001860 for (ct = current->mm->core_state->dumper.next;
1861 ct; ct = ct->next) {
1862 ets = kzalloc(sizeof(*ets), GFP_KERNEL);
1863 if (!ets)
1864 return 0;
1865
1866 ets->thread = ct->task;
1867 list_add(&ets->list, &info->thread_list);
1868 }
1869
Roland McGrath3aba4812008-01-30 13:31:44 +01001870 list_for_each(t, &info->thread_list) {
Roland McGrath3aba4812008-01-30 13:31:44 +01001871 int sz;
1872
WANG Cong4220b7f2008-04-29 01:01:18 -07001873 ets = list_entry(t, struct elf_thread_status, list);
Denys Vlasenko5ab1c302012-10-04 17:15:29 -07001874 sz = elf_dump_thread_status(siginfo->si_signo, ets);
Roland McGrath3aba4812008-01-30 13:31:44 +01001875 info->thread_status_size += sz;
1876 }
1877 }
1878 /* now collect the dump for the current */
1879 memset(info->prstatus, 0, sizeof(*info->prstatus));
Denys Vlasenko5ab1c302012-10-04 17:15:29 -07001880 fill_prstatus(info->prstatus, current, siginfo->si_signo);
Roland McGrath3aba4812008-01-30 13:31:44 +01001881 elf_core_copy_regs(&info->prstatus->pr_reg, regs);
1882
1883 /* Set up header */
Zhang Yanfeid3330cf2013-02-21 16:44:20 -08001884 fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS);
Roland McGrath3aba4812008-01-30 13:31:44 +01001885
1886 /*
1887 * Set up the notes in similar form to SVR4 core dumps made
1888 * with info from their /proc.
1889 */
1890
1891 fill_note(info->notes + 0, "CORE", NT_PRSTATUS,
1892 sizeof(*info->prstatus), info->prstatus);
1893 fill_psinfo(info->psinfo, current->group_leader, current->mm);
1894 fill_note(info->notes + 1, "CORE", NT_PRPSINFO,
1895 sizeof(*info->psinfo), info->psinfo);
1896
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001897 fill_siginfo_note(info->notes + 2, &info->csigdata, siginfo);
1898 fill_auxv_note(info->notes + 3, current->mm);
1899 fill_files_note(info->notes + 4);
Roland McGrath3aba4812008-01-30 13:31:44 +01001900
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001901 info->numnote = 5;
Roland McGrath3aba4812008-01-30 13:31:44 +01001902
1903 /* Try to dump the FPU. */
1904 info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs,
1905 info->fpu);
1906 if (info->prstatus->pr_fpvalid)
1907 fill_note(info->notes + info->numnote++,
1908 "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu);
1909#ifdef ELF_CORE_COPY_XFPREGS
1910 if (elf_core_copy_task_xfpregs(current, info->xfpu))
1911 fill_note(info->notes + info->numnote++,
1912 "LINUX", ELF_CORE_XFPREG_TYPE,
1913 sizeof(*info->xfpu), info->xfpu);
1914#endif
1915
1916 return 1;
Roland McGrath3aba4812008-01-30 13:31:44 +01001917}
1918
1919static size_t get_note_info_size(struct elf_note_info *info)
1920{
1921 int sz = 0;
1922 int i;
1923
1924 for (i = 0; i < info->numnote; i++)
1925 sz += notesize(info->notes + i);
1926
1927 sz += info->thread_status_size;
1928
1929 return sz;
1930}
1931
1932static int write_note_info(struct elf_note_info *info,
1933 struct file *file, loff_t *foffset)
1934{
1935 int i;
1936 struct list_head *t;
1937
1938 for (i = 0; i < info->numnote; i++)
1939 if (!writenote(info->notes + i, file, foffset))
1940 return 0;
1941
1942 /* write out the thread status notes section */
1943 list_for_each(t, &info->thread_list) {
1944 struct elf_thread_status *tmp =
1945 list_entry(t, struct elf_thread_status, list);
1946
1947 for (i = 0; i < tmp->num_notes; i++)
1948 if (!writenote(&tmp->notes[i], file, foffset))
1949 return 0;
1950 }
1951
1952 return 1;
1953}
1954
1955static void free_note_info(struct elf_note_info *info)
1956{
1957 while (!list_empty(&info->thread_list)) {
1958 struct list_head *tmp = info->thread_list.next;
1959 list_del(tmp);
1960 kfree(list_entry(tmp, struct elf_thread_status, list));
1961 }
1962
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001963 /* Free data allocated by fill_files_note(): */
1964 vfree(info->notes[4].data);
1965
Roland McGrath3aba4812008-01-30 13:31:44 +01001966 kfree(info->prstatus);
1967 kfree(info->psinfo);
1968 kfree(info->notes);
1969 kfree(info->fpu);
1970#ifdef ELF_CORE_COPY_XFPREGS
1971 kfree(info->xfpu);
1972#endif
1973}
1974
Roland McGrath4206d3a2008-01-30 13:31:45 +01001975#endif
1976
Roland McGrathf47aef52007-01-26 00:56:49 -08001977static struct vm_area_struct *first_vma(struct task_struct *tsk,
1978 struct vm_area_struct *gate_vma)
1979{
1980 struct vm_area_struct *ret = tsk->mm->mmap;
1981
1982 if (ret)
1983 return ret;
1984 return gate_vma;
1985}
1986/*
1987 * Helper function for iterating across a vma list. It ensures that the caller
1988 * will visit `gate_vma' prior to terminating the search.
1989 */
1990static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
1991 struct vm_area_struct *gate_vma)
1992{
1993 struct vm_area_struct *ret;
1994
1995 ret = this_vma->vm_next;
1996 if (ret)
1997 return ret;
1998 if (this_vma == gate_vma)
1999 return NULL;
2000 return gate_vma;
2001}
2002
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002003static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
2004 elf_addr_t e_shoff, int segs)
2005{
2006 elf->e_shoff = e_shoff;
2007 elf->e_shentsize = sizeof(*shdr4extnum);
2008 elf->e_shnum = 1;
2009 elf->e_shstrndx = SHN_UNDEF;
2010
2011 memset(shdr4extnum, 0, sizeof(*shdr4extnum));
2012
2013 shdr4extnum->sh_type = SHT_NULL;
2014 shdr4extnum->sh_size = elf->e_shnum;
2015 shdr4extnum->sh_link = elf->e_shstrndx;
2016 shdr4extnum->sh_info = segs;
2017}
2018
2019static size_t elf_core_vma_data_size(struct vm_area_struct *gate_vma,
2020 unsigned long mm_flags)
2021{
2022 struct vm_area_struct *vma;
2023 size_t size = 0;
2024
2025 for (vma = first_vma(current, gate_vma); vma != NULL;
2026 vma = next_vma(vma, gate_vma))
2027 size += vma_dump_size(vma, mm_flags);
2028 return size;
2029}
2030
Linus Torvalds1da177e2005-04-16 15:20:36 -07002031/*
2032 * Actual dumper
2033 *
2034 * This is a two-pass process; first we find the offsets of the bits,
2035 * and then they are actually written out. If we run out of core limit
2036 * we just truncate.
2037 */
Masami Hiramatsuf6151df2009-12-17 15:27:16 -08002038static int elf_core_dump(struct coredump_params *cprm)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002039{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002040 int has_dumped = 0;
2041 mm_segment_t fs;
2042 int segs;
2043 size_t size = 0;
Roland McGrathf47aef52007-01-26 00:56:49 -08002044 struct vm_area_struct *vma, *gate_vma;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045 struct elfhdr *elf = NULL;
Andi Kleend025c9d2006-09-30 23:29:28 -07002046 loff_t offset = 0, dataoff, foffset;
Roland McGrath3aba4812008-01-30 13:31:44 +01002047 struct elf_note_info info;
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002048 struct elf_phdr *phdr4note = NULL;
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002049 struct elf_shdr *shdr4extnum = NULL;
2050 Elf_Half e_phnum;
2051 elf_addr_t e_shoff;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052
2053 /*
2054 * We no longer stop all VM operations.
2055 *
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07002056 * This is because those proceses that could possibly change map_count
2057 * or the mmap / vma pages are now blocked in do_exit on current
2058 * finishing this core dump.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059 *
2060 * Only ptrace can touch these memory addresses, but it doesn't change
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07002061 * the map_count or the pages allocated. So no possibility of crashing
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062 * exists while dumping the mm->vm_next areas to the core file.
2063 */
2064
2065 /* alloc memory for large data structures: too large to be on stack */
2066 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
2067 if (!elf)
WANG Cong5f719552008-05-06 12:45:35 +08002068 goto out;
KAMEZAWA Hiroyuki341c87b2009-06-30 11:41:23 -07002069 /*
2070 * The number of segs are recored into ELF header as 16bit value.
2071 * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here.
2072 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073 segs = current->mm->map_count;
Daisuke HATAYAMA1fcccba2010-03-05 13:44:07 -08002074 segs += elf_core_extra_phdrs();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075
Stephen Wilson31db58b2011-03-13 15:49:15 -04002076 gate_vma = get_gate_vma(current->mm);
Roland McGrathf47aef52007-01-26 00:56:49 -08002077 if (gate_vma != NULL)
2078 segs++;
2079
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002080 /* for notes section */
2081 segs++;
2082
2083 /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
2084 * this, kernel supports extended numbering. Have a look at
2085 * include/linux/elf.h for further information. */
2086 e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
2087
Roland McGrath3aba4812008-01-30 13:31:44 +01002088 /*
2089 * Collect all the non-memory information about the process for the
2090 * notes. This also sets up the file header.
2091 */
Denys Vlasenko5ab1c302012-10-04 17:15:29 -07002092 if (!fill_note_info(elf, e_phnum, &info, cprm->siginfo, cprm->regs))
Roland McGrath3aba4812008-01-30 13:31:44 +01002093 goto cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094
2095 has_dumped = 1;
Oleg Nesterov079148b2013-04-30 15:28:16 -07002096
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097 fs = get_fs();
2098 set_fs(KERNEL_DS);
2099
Linus Torvalds1da177e2005-04-16 15:20:36 -07002100 offset += sizeof(*elf); /* Elf header */
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002101 offset += segs * sizeof(struct elf_phdr); /* Program headers */
Petr Vandroveca7a0d862006-10-13 18:42:07 +02002102 foffset = offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103
2104 /* Write notes phdr entry */
2105 {
Roland McGrath3aba4812008-01-30 13:31:44 +01002106 size_t sz = get_note_info_size(&info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107
Michael Ellermane5501492007-09-19 14:38:12 +10002108 sz += elf_coredump_extra_notes_size();
Dwayne Grant McConnellbf1ab972006-11-23 00:46:37 +01002109
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002110 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
2111 if (!phdr4note)
Daisuke HATAYAMA088e7af2010-03-05 13:44:06 -08002112 goto end_coredump;
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002113
2114 fill_elf_note_phdr(phdr4note, sz, offset);
2115 offset += sz;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002116 }
2117
Linus Torvalds1da177e2005-04-16 15:20:36 -07002118 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
2119
Masami Hiramatsu30736a42010-03-05 13:44:12 -08002120 offset += elf_core_vma_data_size(gate_vma, cprm->mm_flags);
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002121 offset += elf_core_extra_data_size();
2122 e_shoff = offset;
2123
2124 if (e_phnum == PN_XNUM) {
2125 shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
2126 if (!shdr4extnum)
2127 goto end_coredump;
2128 fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
2129 }
2130
2131 offset = dataoff;
2132
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002133 size += sizeof(*elf);
2134 if (size > cprm->limit || !dump_write(cprm->file, elf, sizeof(*elf)))
2135 goto end_coredump;
2136
2137 size += sizeof(*phdr4note);
2138 if (size > cprm->limit
2139 || !dump_write(cprm->file, phdr4note, sizeof(*phdr4note)))
2140 goto end_coredump;
2141
Linus Torvalds1da177e2005-04-16 15:20:36 -07002142 /* Write program headers for segments dump */
Roland McGrathf47aef52007-01-26 00:56:49 -08002143 for (vma = first_vma(current, gate_vma); vma != NULL;
2144 vma = next_vma(vma, gate_vma)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145 struct elf_phdr phdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002146
2147 phdr.p_type = PT_LOAD;
2148 phdr.p_offset = offset;
2149 phdr.p_vaddr = vma->vm_start;
2150 phdr.p_paddr = 0;
Masami Hiramatsu30736a42010-03-05 13:44:12 -08002151 phdr.p_filesz = vma_dump_size(vma, cprm->mm_flags);
Roland McGrath82df3972007-10-16 23:27:02 -07002152 phdr.p_memsz = vma->vm_end - vma->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002153 offset += phdr.p_filesz;
2154 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07002155 if (vma->vm_flags & VM_WRITE)
2156 phdr.p_flags |= PF_W;
2157 if (vma->vm_flags & VM_EXEC)
2158 phdr.p_flags |= PF_X;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002159 phdr.p_align = ELF_EXEC_PAGESIZE;
2160
Daisuke HATAYAMA088e7af2010-03-05 13:44:06 -08002161 size += sizeof(phdr);
2162 if (size > cprm->limit
2163 || !dump_write(cprm->file, &phdr, sizeof(phdr)))
2164 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002165 }
2166
Daisuke HATAYAMA1fcccba2010-03-05 13:44:07 -08002167 if (!elf_core_write_extra_phdrs(cprm->file, offset, &size, cprm->limit))
2168 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002169
2170 /* write out the notes section */
Masami Hiramatsuf6151df2009-12-17 15:27:16 -08002171 if (!write_note_info(&info, cprm->file, &foffset))
Roland McGrath3aba4812008-01-30 13:31:44 +01002172 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002173
Masami Hiramatsuf6151df2009-12-17 15:27:16 -08002174 if (elf_coredump_extra_notes_write(cprm->file, &foffset))
Michael Ellermane5501492007-09-19 14:38:12 +10002175 goto end_coredump;
Dwayne Grant McConnellbf1ab972006-11-23 00:46:37 +01002176
Andi Kleend025c9d2006-09-30 23:29:28 -07002177 /* Align to page */
Masami Hiramatsuf6151df2009-12-17 15:27:16 -08002178 if (!dump_seek(cprm->file, dataoff - foffset))
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002179 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002180
Roland McGrathf47aef52007-01-26 00:56:49 -08002181 for (vma = first_vma(current, gate_vma); vma != NULL;
2182 vma = next_vma(vma, gate_vma)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002183 unsigned long addr;
Roland McGrath82df3972007-10-16 23:27:02 -07002184 unsigned long end;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002185
Masami Hiramatsu30736a42010-03-05 13:44:12 -08002186 end = vma->vm_start + vma_dump_size(vma, cprm->mm_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002187
Roland McGrath82df3972007-10-16 23:27:02 -07002188 for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) {
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07002189 struct page *page;
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002190 int stop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002192 page = get_dump_page(addr);
2193 if (page) {
2194 void *kaddr = kmap(page);
Masami Hiramatsuf6151df2009-12-17 15:27:16 -08002195 stop = ((size += PAGE_SIZE) > cprm->limit) ||
2196 !dump_write(cprm->file, kaddr,
2197 PAGE_SIZE);
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002198 kunmap(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002199 page_cache_release(page);
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002200 } else
Masami Hiramatsuf6151df2009-12-17 15:27:16 -08002201 stop = !dump_seek(cprm->file, PAGE_SIZE);
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002202 if (stop)
2203 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002204 }
2205 }
2206
Daisuke HATAYAMA1fcccba2010-03-05 13:44:07 -08002207 if (!elf_core_write_extra_data(cprm->file, &size, cprm->limit))
2208 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002210 if (e_phnum == PN_XNUM) {
2211 size += sizeof(*shdr4extnum);
2212 if (size > cprm->limit
2213 || !dump_write(cprm->file, shdr4extnum,
2214 sizeof(*shdr4extnum)))
2215 goto end_coredump;
2216 }
2217
Linus Torvalds1da177e2005-04-16 15:20:36 -07002218end_coredump:
2219 set_fs(fs);
2220
2221cleanup:
Roland McGrath3aba4812008-01-30 13:31:44 +01002222 free_note_info(&info);
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002223 kfree(shdr4extnum);
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002224 kfree(phdr4note);
WANG Cong5f719552008-05-06 12:45:35 +08002225 kfree(elf);
2226out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002227 return has_dumped;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002228}
2229
Christoph Hellwig698ba7b2009-12-15 16:47:37 -08002230#endif /* CONFIG_ELF_CORE */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002231
2232static int __init init_elf_binfmt(void)
2233{
Al Viro8fc3dc52012-03-17 03:05:16 -04002234 register_binfmt(&elf_format);
2235 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002236}
2237
2238static void __exit exit_elf_binfmt(void)
2239{
2240 /* Remove the COFF and ELF loaders. */
2241 unregister_binfmt(&elf_format);
2242}
2243
2244core_initcall(init_elf_binfmt);
2245module_exit(exit_elf_binfmt);
2246MODULE_LICENSE("GPL");