blob: cfd724f98332680abb17e2a916674c9593cd104a [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>
Kees Cookd1fd8362015-04-14 15:48:07 -070034#include <linux/elf-randomize.h>
Alexey Dobriyan7e80d0d2007-05-08 00:28:59 -070035#include <linux/utsname.h>
Daisuke HATAYAMA088e7af2010-03-05 13:44:06 -080036#include <linux/coredump.h>
Frederic Weisbecker6fac4822012-11-13 14:20:55 +010037#include <linux/sched.h>
Ross Zwisler50378352015-10-05 16:33:36 -060038#include <linux/dax.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <asm/uaccess.h>
40#include <asm/param.h>
41#include <asm/page.h>
42
Denys Vlasenko2aa362c2012-10-04 17:15:36 -070043#ifndef user_long_t
44#define user_long_t long
45#endif
Denys Vlasenko49ae4d42012-10-04 17:15:35 -070046#ifndef user_siginfo_t
47#define user_siginfo_t siginfo_t
48#endif
49
Al Viro71613c32012-10-20 22:00:48 -040050static int load_elf_binary(struct linux_binprm *bprm);
Andrew Mortonbb1ad822008-01-30 13:31:07 +010051static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *,
52 int, int, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
Josh Triplett69369a72014-04-03 14:48:27 -070054#ifdef CONFIG_USELIB
55static int load_elf_library(struct file *);
56#else
57#define load_elf_library NULL
58#endif
59
Linus Torvalds1da177e2005-04-16 15:20:36 -070060/*
61 * If we don't support core dumping, then supply a NULL so we
62 * don't even try.
63 */
Christoph Hellwig698ba7b2009-12-15 16:47:37 -080064#ifdef CONFIG_ELF_CORE
Masami Hiramatsuf6151df2009-12-17 15:27:16 -080065static int elf_core_dump(struct coredump_params *cprm);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#else
67#define elf_core_dump NULL
68#endif
69
70#if ELF_EXEC_PAGESIZE > PAGE_SIZE
Jesper Juhlf4e5cc22006-06-23 02:05:35 -070071#define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#else
Jesper Juhlf4e5cc22006-06-23 02:05:35 -070073#define ELF_MIN_ALIGN PAGE_SIZE
Linus Torvalds1da177e2005-04-16 15:20:36 -070074#endif
75
76#ifndef ELF_CORE_EFLAGS
77#define ELF_CORE_EFLAGS 0
78#endif
79
80#define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
81#define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
82#define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
83
84static struct linux_binfmt elf_format = {
Mikael Petterssonf670d0e2011-01-12 17:00:02 -080085 .module = THIS_MODULE,
86 .load_binary = load_elf_binary,
87 .load_shlib = load_elf_library,
88 .core_dump = elf_core_dump,
89 .min_coredump = ELF_EXEC_PAGESIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -070090};
91
Andrew Mortond4e3cc32007-07-21 04:37:32 -070092#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
94static int set_brk(unsigned long start, unsigned long end)
95{
96 start = ELF_PAGEALIGN(start);
97 end = ELF_PAGEALIGN(end);
98 if (end > start) {
Linus Torvalds5d22fc22016-05-27 15:57:31 -070099 int error = vm_brk(start, end - start);
100 if (error)
101 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 }
103 current->mm->start_brk = current->mm->brk = end;
104 return 0;
105}
106
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107/* We need to explicitly zero any fractional pages
108 after the data section (i.e. bss). This would
109 contain the junk from the file that should not
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700110 be in memory
111 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112static int padzero(unsigned long elf_bss)
113{
114 unsigned long nbyte;
115
116 nbyte = ELF_PAGEOFFSET(elf_bss);
117 if (nbyte) {
118 nbyte = ELF_MIN_ALIGN - nbyte;
119 if (clear_user((void __user *) elf_bss, nbyte))
120 return -EFAULT;
121 }
122 return 0;
123}
124
Ohad Ben-Cohen09c6dd32008-02-03 18:05:15 +0200125/* Let's use some macros to make this stack manipulation a little clearer */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126#ifdef CONFIG_STACK_GROWSUP
127#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
128#define STACK_ROUND(sp, items) \
129 ((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700130#define STACK_ALLOC(sp, len) ({ \
131 elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \
132 old_sp; })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133#else
134#define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
135#define STACK_ROUND(sp, items) \
136 (((unsigned long) (sp - items)) &~ 15UL)
137#define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
138#endif
139
Nathan Lynch483fad12008-07-22 04:48:46 +1000140#ifndef ELF_BASE_PLATFORM
141/*
142 * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
143 * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
144 * will be copied to the user stack in the same manner as AT_PLATFORM.
145 */
146#define ELF_BASE_PLATFORM NULL
147#endif
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149static int
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700150create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
Andi Kleend20894a2008-02-08 04:21:54 -0800151 unsigned long load_addr, unsigned long interp_load_addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
153 unsigned long p = bprm->p;
154 int argc = bprm->argc;
155 int envc = bprm->envc;
156 elf_addr_t __user *argv;
157 elf_addr_t __user *envp;
158 elf_addr_t __user *sp;
159 elf_addr_t __user *u_platform;
Nathan Lynch483fad12008-07-22 04:48:46 +1000160 elf_addr_t __user *u_base_platform;
Kees Cookf06295b2009-01-07 18:08:52 -0800161 elf_addr_t __user *u_rand_bytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 const char *k_platform = ELF_PLATFORM;
Nathan Lynch483fad12008-07-22 04:48:46 +1000163 const char *k_base_platform = ELF_BASE_PLATFORM;
Kees Cookf06295b2009-01-07 18:08:52 -0800164 unsigned char k_rand_bytes[16];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 int items;
166 elf_addr_t *elf_info;
167 int ei_index = 0;
David Howells86a264a2008-11-14 10:39:18 +1100168 const struct cred *cred = current_cred();
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700169 struct vm_area_struct *vma;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171 /*
Franck Bui-Huud68c9d62007-10-16 23:30:24 -0700172 * In some cases (e.g. Hyper-Threading), we want to avoid L1
173 * evictions by the processes running on the same package. One
174 * thing we can do is to shuffle the initial stack for them.
175 */
176
177 p = arch_align_stack(p);
178
179 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 * If this architecture has a platform capability string, copy it
181 * to userspace. In some cases (Sparc), this info is impossible
182 * for userspace to get any other way, in others (i386) it is
183 * merely difficult.
184 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 u_platform = NULL;
186 if (k_platform) {
187 size_t len = strlen(k_platform) + 1;
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
190 if (__copy_to_user(u_platform, k_platform, len))
191 return -EFAULT;
192 }
193
Nathan Lynch483fad12008-07-22 04:48:46 +1000194 /*
195 * If this architecture has a "base" platform capability
196 * string, copy it to userspace.
197 */
198 u_base_platform = NULL;
199 if (k_base_platform) {
200 size_t len = strlen(k_base_platform) + 1;
201
202 u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
203 if (__copy_to_user(u_base_platform, k_base_platform, len))
204 return -EFAULT;
205 }
206
Kees Cookf06295b2009-01-07 18:08:52 -0800207 /*
208 * Generate 16 random bytes for userspace PRNG seeding.
209 */
210 get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes));
211 u_rand_bytes = (elf_addr_t __user *)
212 STACK_ALLOC(p, sizeof(k_rand_bytes));
213 if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes)))
214 return -EFAULT;
215
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 /* Create the ELF interpreter info */
Jesper Juhl785d5572006-06-23 02:05:35 -0700217 elf_info = (elf_addr_t *)current->mm->saved_auxv;
Olaf Hering4f9a58d2007-10-16 23:30:12 -0700218 /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219#define NEW_AUX_ENT(id, val) \
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700220 do { \
Jesper Juhl785d5572006-06-23 02:05:35 -0700221 elf_info[ei_index++] = id; \
222 elf_info[ei_index++] = val; \
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700223 } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225#ifdef ARCH_DLINFO
226 /*
227 * ARCH_DLINFO must come first so PPC can do its special alignment of
228 * AUXV.
Olaf Hering4f9a58d2007-10-16 23:30:12 -0700229 * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in
230 * ARCH_DLINFO changes
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 */
232 ARCH_DLINFO;
233#endif
234 NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
235 NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE);
236 NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
237 NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff);
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700238 NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
240 NEW_AUX_ENT(AT_BASE, interp_load_addr);
241 NEW_AUX_ENT(AT_FLAGS, 0);
242 NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
Eric W. Biedermanebc887b2012-02-07 18:36:10 -0800243 NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid));
244 NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid));
245 NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid));
246 NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid));
Jesper Juhl785d5572006-06-23 02:05:35 -0700247 NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
Kees Cookf06295b2009-01-07 18:08:52 -0800248 NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes);
Michael Neuling21713642013-04-17 17:33:11 +0000249#ifdef ELF_HWCAP2
250 NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);
251#endif
John Reiser65191082008-07-21 14:21:32 -0700252 NEW_AUX_ENT(AT_EXECFN, bprm->exec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 if (k_platform) {
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700254 NEW_AUX_ENT(AT_PLATFORM,
Jesper Juhl785d5572006-06-23 02:05:35 -0700255 (elf_addr_t)(unsigned long)u_platform);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 }
Nathan Lynch483fad12008-07-22 04:48:46 +1000257 if (k_base_platform) {
258 NEW_AUX_ENT(AT_BASE_PLATFORM,
259 (elf_addr_t)(unsigned long)u_base_platform);
260 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
Jesper Juhl785d5572006-06-23 02:05:35 -0700262 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 }
264#undef NEW_AUX_ENT
265 /* AT_NULL is zero; clear the rest too */
266 memset(&elf_info[ei_index], 0,
267 sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]);
268
269 /* And advance past the AT_NULL entry. */
270 ei_index += 2;
271
272 sp = STACK_ADD(p, ei_index);
273
Andi Kleend20894a2008-02-08 04:21:54 -0800274 items = (argc + 1) + (envc + 1) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 bprm->p = STACK_ROUND(sp, items);
276
277 /* Point sp at the lowest address on the stack */
278#ifdef CONFIG_STACK_GROWSUP
279 sp = (elf_addr_t __user *)bprm->p - items - ei_index;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700280 bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281#else
282 sp = (elf_addr_t __user *)bprm->p;
283#endif
284
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700285
286 /*
287 * Grow the stack manually; some architectures have a limit on how
288 * far ahead a user-space access may be in order to grow the stack.
289 */
290 vma = find_extend_vma(current->mm, bprm->p);
291 if (!vma)
292 return -EFAULT;
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 /* Now, let's put argc (and argv, envp if appropriate) on the stack */
295 if (__put_user(argc, sp++))
296 return -EFAULT;
Andi Kleend20894a2008-02-08 04:21:54 -0800297 argv = sp;
298 envp = argv + argc + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300 /* Populate argv and envp */
Greg Kroah-Hartmana84a5052005-05-11 00:10:44 -0700301 p = current->mm->arg_end = current->mm->arg_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 while (argc-- > 0) {
303 size_t len;
Heiko Carstens841d5fb2006-12-06 20:36:35 -0800304 if (__put_user((elf_addr_t)p, argv++))
305 return -EFAULT;
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700306 len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
307 if (!len || len > MAX_ARG_STRLEN)
WANG Cong23c49712008-05-08 21:52:33 +0800308 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 p += len;
310 }
311 if (__put_user(0, argv))
312 return -EFAULT;
313 current->mm->arg_end = current->mm->env_start = p;
314 while (envc-- > 0) {
315 size_t len;
Heiko Carstens841d5fb2006-12-06 20:36:35 -0800316 if (__put_user((elf_addr_t)p, envp++))
317 return -EFAULT;
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700318 len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
319 if (!len || len > MAX_ARG_STRLEN)
WANG Cong23c49712008-05-08 21:52:33 +0800320 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 p += len;
322 }
323 if (__put_user(0, envp))
324 return -EFAULT;
325 current->mm->env_end = p;
326
327 /* Put the elf_info on the stack in the right place. */
328 sp = (elf_addr_t __user *)envp + 1;
329 if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t)))
330 return -EFAULT;
331 return 0;
332}
333
James Hoganc07380b2011-05-09 10:58:40 +0100334#ifndef elf_map
335
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336static unsigned long elf_map(struct file *filep, unsigned long addr,
Jiri Kosinacc503c12008-01-30 13:31:07 +0100337 struct elf_phdr *eppnt, int prot, int type,
338 unsigned long total_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339{
340 unsigned long map_addr;
Jiri Kosinacc503c12008-01-30 13:31:07 +0100341 unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr);
342 unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr);
343 addr = ELF_PAGESTART(addr);
344 size = ELF_PAGEALIGN(size);
Jan Kratochvil60bfba72007-07-15 23:40:06 -0700345
Andrew Mortond4e3cc32007-07-21 04:37:32 -0700346 /* mmap() will return -EINVAL if given a zero size, but a
347 * segment with zero filesize is perfectly valid */
Jiri Kosinacc503c12008-01-30 13:31:07 +0100348 if (!size)
349 return addr;
350
Jiri Kosinacc503c12008-01-30 13:31:07 +0100351 /*
352 * total_size is the size of the ELF (interpreter) image.
353 * The _first_ mmap needs to know the full size, otherwise
354 * randomization might put this image into an overlapping
355 * position with the ELF binary image. (since size < total_size)
356 * So we first map the 'big' image - and unmap the remainder at
357 * the end. (which unmap is needed for ELF images with holes.)
358 */
359 if (total_size) {
360 total_size = ELF_PAGEALIGN(total_size);
Al Viro5a5e4c22012-05-30 01:49:38 -0400361 map_addr = vm_mmap(filep, addr, total_size, prot, type, off);
Jiri Kosinacc503c12008-01-30 13:31:07 +0100362 if (!BAD_ADDR(map_addr))
Al Viro5a5e4c22012-05-30 01:49:38 -0400363 vm_munmap(map_addr+size, total_size-size);
Jiri Kosinacc503c12008-01-30 13:31:07 +0100364 } else
Al Viro5a5e4c22012-05-30 01:49:38 -0400365 map_addr = vm_mmap(filep, addr, size, prot, type, off);
Jiri Kosinacc503c12008-01-30 13:31:07 +0100366
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 return(map_addr);
368}
369
James Hoganc07380b2011-05-09 10:58:40 +0100370#endif /* !elf_map */
371
Jiri Kosinacc503c12008-01-30 13:31:07 +0100372static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr)
373{
374 int i, first_idx = -1, last_idx = -1;
375
376 for (i = 0; i < nr; i++) {
377 if (cmds[i].p_type == PT_LOAD) {
378 last_idx = i;
379 if (first_idx == -1)
380 first_idx = i;
381 }
382 }
383 if (first_idx == -1)
384 return 0;
385
386 return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz -
387 ELF_PAGESTART(cmds[first_idx].p_vaddr);
388}
389
Paul Burton6a8d3892014-09-11 08:30:14 +0100390/**
391 * load_elf_phdrs() - load ELF program headers
392 * @elf_ex: ELF header of the binary whose program headers should be loaded
393 * @elf_file: the opened ELF binary file
394 *
395 * Loads ELF program headers from the binary file elf_file, which has the ELF
396 * header pointed to by elf_ex, into a newly allocated array. The caller is
397 * responsible for freeing the allocated data. Returns an ERR_PTR upon failure.
398 */
399static struct elf_phdr *load_elf_phdrs(struct elfhdr *elf_ex,
400 struct file *elf_file)
401{
402 struct elf_phdr *elf_phdata = NULL;
403 int retval, size, err = -1;
404
405 /*
406 * If the size of this structure has changed, then punt, since
407 * we will be doing the wrong thing.
408 */
409 if (elf_ex->e_phentsize != sizeof(struct elf_phdr))
410 goto out;
411
412 /* Sanity check the number of program headers... */
413 if (elf_ex->e_phnum < 1 ||
414 elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr))
415 goto out;
416
417 /* ...and their total size. */
418 size = sizeof(struct elf_phdr) * elf_ex->e_phnum;
419 if (size > ELF_MIN_ALIGN)
420 goto out;
421
422 elf_phdata = kmalloc(size, GFP_KERNEL);
423 if (!elf_phdata)
424 goto out;
425
426 /* Read in the program headers */
427 retval = kernel_read(elf_file, elf_ex->e_phoff,
428 (char *)elf_phdata, size);
429 if (retval != size) {
430 err = (retval < 0) ? retval : -EIO;
431 goto out;
432 }
433
434 /* Success! */
435 err = 0;
436out:
437 if (err) {
438 kfree(elf_phdata);
439 elf_phdata = NULL;
440 }
441 return elf_phdata;
442}
Jiri Kosinacc503c12008-01-30 13:31:07 +0100443
Paul Burton774c1052014-09-11 08:30:16 +0100444#ifndef CONFIG_ARCH_BINFMT_ELF_STATE
445
446/**
447 * struct arch_elf_state - arch-specific ELF loading state
448 *
449 * This structure is used to preserve architecture specific data during
450 * the loading of an ELF file, throughout the checking of architecture
451 * specific ELF headers & through to the point where the ELF load is
452 * known to be proceeding (ie. SET_PERSONALITY).
453 *
454 * This implementation is a dummy for architectures which require no
455 * specific state.
456 */
457struct arch_elf_state {
458};
459
460#define INIT_ARCH_ELF_STATE {}
461
462/**
463 * arch_elf_pt_proc() - check a PT_LOPROC..PT_HIPROC ELF program header
464 * @ehdr: The main ELF header
465 * @phdr: The program header to check
466 * @elf: The open ELF file
467 * @is_interp: True if the phdr is from the interpreter of the ELF being
468 * loaded, else false.
469 * @state: Architecture-specific state preserved throughout the process
470 * of loading the ELF.
471 *
472 * Inspects the program header phdr to validate its correctness and/or
473 * suitability for the system. Called once per ELF program header in the
474 * range PT_LOPROC to PT_HIPROC, for both the ELF being loaded and its
475 * interpreter.
476 *
477 * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load
478 * with that return code.
479 */
480static inline int arch_elf_pt_proc(struct elfhdr *ehdr,
481 struct elf_phdr *phdr,
482 struct file *elf, bool is_interp,
483 struct arch_elf_state *state)
484{
485 /* Dummy implementation, always proceed */
486 return 0;
487}
488
489/**
Maciej W. Rozycki54d15712015-10-26 15:47:57 +0000490 * arch_check_elf() - check an ELF executable
Paul Burton774c1052014-09-11 08:30:16 +0100491 * @ehdr: The main ELF header
492 * @has_interp: True if the ELF has an interpreter, else false.
Maciej W. Rozyckieb4bc072015-11-13 00:47:48 +0000493 * @interp_ehdr: The interpreter's ELF header
Paul Burton774c1052014-09-11 08:30:16 +0100494 * @state: Architecture-specific state preserved throughout the process
495 * of loading the ELF.
496 *
497 * Provides a final opportunity for architecture code to reject the loading
498 * of the ELF & cause an exec syscall to return an error. This is called after
499 * all program headers to be checked by arch_elf_pt_proc have been.
500 *
501 * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load
502 * with that return code.
503 */
504static inline int arch_check_elf(struct elfhdr *ehdr, bool has_interp,
Maciej W. Rozyckieb4bc072015-11-13 00:47:48 +0000505 struct elfhdr *interp_ehdr,
Paul Burton774c1052014-09-11 08:30:16 +0100506 struct arch_elf_state *state)
507{
508 /* Dummy implementation, always proceed */
509 return 0;
510}
511
512#endif /* !CONFIG_ARCH_BINFMT_ELF_STATE */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
514/* This is much more generalized than the library routine read function,
515 so we keep this separate. Technically the library read function
516 is only provided so that we can read a.out libraries that have
517 an ELF header */
518
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700519static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
Jiri Kosinacc503c12008-01-30 13:31:07 +0100520 struct file *interpreter, unsigned long *interp_map_addr,
Paul Burtona9d9ef12014-09-11 08:30:15 +0100521 unsigned long no_base, struct elf_phdr *interp_elf_phdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 struct elf_phdr *eppnt;
524 unsigned long load_addr = 0;
525 int load_addr_set = 0;
526 unsigned long last_bss = 0, elf_bss = 0;
527 unsigned long error = ~0UL;
Jiri Kosinacc503c12008-01-30 13:31:07 +0100528 unsigned long total_size;
Paul Burton6a8d3892014-09-11 08:30:14 +0100529 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 /* First of all, some simple consistency checks */
532 if (interp_elf_ex->e_type != ET_EXEC &&
533 interp_elf_ex->e_type != ET_DYN)
534 goto out;
535 if (!elf_check_arch(interp_elf_ex))
536 goto out;
Al Viro72c2d532013-09-22 16:27:52 -0400537 if (!interpreter->f_op->mmap)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 goto out;
539
Paul Burtona9d9ef12014-09-11 08:30:15 +0100540 total_size = total_mapping_size(interp_elf_phdata,
541 interp_elf_ex->e_phnum);
Jiri Kosinacc503c12008-01-30 13:31:07 +0100542 if (!total_size) {
543 error = -EINVAL;
Paul Burtona9d9ef12014-09-11 08:30:15 +0100544 goto out;
Jiri Kosinacc503c12008-01-30 13:31:07 +0100545 }
546
Paul Burtona9d9ef12014-09-11 08:30:15 +0100547 eppnt = interp_elf_phdata;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700548 for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
549 if (eppnt->p_type == PT_LOAD) {
550 int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
551 int elf_prot = 0;
552 unsigned long vaddr = 0;
553 unsigned long k, map_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700555 if (eppnt->p_flags & PF_R)
556 elf_prot = PROT_READ;
557 if (eppnt->p_flags & PF_W)
558 elf_prot |= PROT_WRITE;
559 if (eppnt->p_flags & PF_X)
560 elf_prot |= PROT_EXEC;
561 vaddr = eppnt->p_vaddr;
562 if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
563 elf_type |= MAP_FIXED;
Jiri Kosinacc503c12008-01-30 13:31:07 +0100564 else if (no_base && interp_elf_ex->e_type == ET_DYN)
565 load_addr = -vaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700567 map_addr = elf_map(interpreter, load_addr + vaddr,
Andrew Mortonbb1ad822008-01-30 13:31:07 +0100568 eppnt, elf_prot, elf_type, total_size);
Jiri Kosinacc503c12008-01-30 13:31:07 +0100569 total_size = 0;
570 if (!*interp_map_addr)
571 *interp_map_addr = map_addr;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700572 error = map_addr;
573 if (BAD_ADDR(map_addr))
Paul Burtona9d9ef12014-09-11 08:30:15 +0100574 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700576 if (!load_addr_set &&
577 interp_elf_ex->e_type == ET_DYN) {
578 load_addr = map_addr - ELF_PAGESTART(vaddr);
579 load_addr_set = 1;
580 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700582 /*
583 * Check to see if the section's size will overflow the
584 * allowed task size. Note that p_filesz must always be
585 * <= p_memsize so it's only necessary to check p_memsz.
586 */
587 k = load_addr + eppnt->p_vaddr;
Chuck Ebbertce510592006-07-03 00:24:14 -0700588 if (BAD_ADDR(k) ||
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700589 eppnt->p_filesz > eppnt->p_memsz ||
590 eppnt->p_memsz > TASK_SIZE ||
591 TASK_SIZE - eppnt->p_memsz < k) {
592 error = -ENOMEM;
Paul Burtona9d9ef12014-09-11 08:30:15 +0100593 goto out;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700594 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700596 /*
597 * Find the end of the file mapping for this phdr, and
598 * keep track of the largest address we see for this.
599 */
600 k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
601 if (k > elf_bss)
602 elf_bss = k;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700604 /*
605 * Do the same thing for the memory mapping - between
606 * elf_bss and last_bss is the bss section.
607 */
Kees Cook0036d1f2016-08-02 14:04:51 -0700608 k = load_addr + eppnt->p_vaddr + eppnt->p_memsz;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700609 if (k > last_bss)
610 last_bss = k;
611 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 }
613
Kees Cook0036d1f2016-08-02 14:04:51 -0700614 /*
615 * Now fill out the bss section: first pad the last page from
616 * the file up to the page boundary, and zero it from elf_bss
617 * up to the end of the page.
618 */
619 if (padzero(elf_bss)) {
620 error = -EFAULT;
621 goto out;
622 }
623 /*
624 * Next, align both the file and mem bss up to the page size,
625 * since this is where elf_bss was just zeroed up to, and where
626 * last_bss will end after the vm_brk() below.
627 */
628 elf_bss = ELF_PAGEALIGN(elf_bss);
629 last_bss = ELF_PAGEALIGN(last_bss);
630 /* Finally, if there is still more bss to allocate, do it. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 if (last_bss > elf_bss) {
Linus Torvaldse4eb1ff2012-04-20 15:35:40 -0700632 error = vm_brk(elf_bss, last_bss - elf_bss);
Linus Torvalds5d22fc22016-05-27 15:57:31 -0700633 if (error)
Paul Burtona9d9ef12014-09-11 08:30:15 +0100634 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 }
636
Jiri Kosinacc503c12008-01-30 13:31:07 +0100637 error = load_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638out:
639 return error;
640}
641
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642/*
643 * These are the functions used to load ELF style executables and shared
644 * libraries. There is no binary dependent code anywhere else.
645 */
646
Andi Kleen913bd902006-03-25 16:29:09 +0100647#ifndef STACK_RND_MASK
James Bottomleyd1cabd62007-03-16 13:38:35 -0800648#define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) /* 8MB of VA */
Andi Kleen913bd902006-03-25 16:29:09 +0100649#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650
651static unsigned long randomize_stack_top(unsigned long stack_top)
652{
Hector Marco-Gisbert4e7c22d2015-02-14 09:33:50 -0800653 unsigned long random_variable = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
Andi Kleenc16b63e02006-09-26 10:52:28 +0200655 if ((current->flags & PF_RANDOMIZE) &&
656 !(current->personality & ADDR_NO_RANDOMIZE)) {
Daniel Cashman5ef11c32016-02-26 15:19:37 -0800657 random_variable = get_random_long();
Hector Marco-Gisbert4e7c22d2015-02-14 09:33:50 -0800658 random_variable &= STACK_RND_MASK;
Andi Kleen913bd902006-03-25 16:29:09 +0100659 random_variable <<= PAGE_SHIFT;
660 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661#ifdef CONFIG_STACK_GROWSUP
Andi Kleen913bd902006-03-25 16:29:09 +0100662 return PAGE_ALIGN(stack_top) + random_variable;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663#else
Andi Kleen913bd902006-03-25 16:29:09 +0100664 return PAGE_ALIGN(stack_top) - random_variable;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665#endif
666}
667
Al Viro71613c32012-10-20 22:00:48 -0400668static int load_elf_binary(struct linux_binprm *bprm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669{
670 struct file *interpreter = NULL; /* to shut gcc up */
671 unsigned long load_addr = 0, load_bias = 0;
672 int load_addr_set = 0;
673 char * elf_interpreter = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 unsigned long error;
Paul Burtona9d9ef12014-09-11 08:30:15 +0100675 struct elf_phdr *elf_ppnt, *elf_phdata, *interp_elf_phdata = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 unsigned long elf_bss, elf_brk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 int retval, i;
Jiri Kosinacc503c12008-01-30 13:31:07 +0100678 unsigned long elf_entry;
679 unsigned long interp_load_addr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 unsigned long start_code, end_code, start_data, end_data;
David Daney1a530a62011-03-22 16:34:48 -0700681 unsigned long reloc_func_desc __maybe_unused = 0;
David Rientjes8de61e62006-12-06 20:40:16 -0800682 int executable_stack = EXSTACK_DEFAULT;
Al Viro71613c32012-10-20 22:00:48 -0400683 struct pt_regs *regs = current_pt_regs();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 struct {
685 struct elfhdr elf_ex;
686 struct elfhdr interp_elf_ex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 } *loc;
Paul Burton774c1052014-09-11 08:30:16 +0100688 struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689
690 loc = kmalloc(sizeof(*loc), GFP_KERNEL);
691 if (!loc) {
692 retval = -ENOMEM;
693 goto out_ret;
694 }
695
696 /* Get the exec-header */
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700697 loc->elf_ex = *((struct elfhdr *)bprm->buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
699 retval = -ENOEXEC;
700 /* First of all, some simple consistency checks */
701 if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
702 goto out;
703
704 if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN)
705 goto out;
706 if (!elf_check_arch(&loc->elf_ex))
707 goto out;
Al Viro72c2d532013-09-22 16:27:52 -0400708 if (!bprm->file->f_op->mmap)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 goto out;
710
Paul Burton6a8d3892014-09-11 08:30:14 +0100711 elf_phdata = load_elf_phdrs(&loc->elf_ex, bprm->file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 if (!elf_phdata)
713 goto out;
714
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 elf_ppnt = elf_phdata;
716 elf_bss = 0;
717 elf_brk = 0;
718
719 start_code = ~0UL;
720 end_code = 0;
721 start_data = 0;
722 end_data = 0;
723
724 for (i = 0; i < loc->elf_ex.e_phnum; i++) {
725 if (elf_ppnt->p_type == PT_INTERP) {
726 /* This is the program interpreter used for
727 * shared libraries - for now assume that this
728 * is an a.out format binary
729 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 retval = -ENOEXEC;
731 if (elf_ppnt->p_filesz > PATH_MAX ||
732 elf_ppnt->p_filesz < 2)
Al Viroe7b9b552009-03-29 16:31:16 -0400733 goto out_free_ph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
735 retval = -ENOMEM;
Jesper Juhl792db3a2006-01-09 20:54:45 -0800736 elf_interpreter = kmalloc(elf_ppnt->p_filesz,
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700737 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 if (!elf_interpreter)
Al Viroe7b9b552009-03-29 16:31:16 -0400739 goto out_free_ph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
741 retval = kernel_read(bprm->file, elf_ppnt->p_offset,
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700742 elf_interpreter,
743 elf_ppnt->p_filesz);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 if (retval != elf_ppnt->p_filesz) {
745 if (retval >= 0)
746 retval = -EIO;
747 goto out_free_interp;
748 }
749 /* make sure path is NULL terminated */
750 retval = -ENOEXEC;
751 if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
752 goto out_free_interp;
753
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 interpreter = open_exec(elf_interpreter);
755 retval = PTR_ERR(interpreter);
756 if (IS_ERR(interpreter))
757 goto out_free_interp;
Alexey Dobriyan1fb84492007-01-26 00:57:16 -0800758
759 /*
760 * If the binary is not readable then enforce
761 * mm->dumpable = 0 regardless of the interpreter's
762 * permissions.
763 */
Al Viro1b5d7832011-06-19 12:49:47 -0400764 would_dump(bprm, interpreter);
Alexey Dobriyan1fb84492007-01-26 00:57:16 -0800765
Maciej W. Rozyckib582ef52015-10-26 15:48:19 +0000766 /* Get the exec headers */
767 retval = kernel_read(interpreter, 0,
768 (void *)&loc->interp_elf_ex,
769 sizeof(loc->interp_elf_ex));
770 if (retval != sizeof(loc->interp_elf_ex)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 if (retval >= 0)
772 retval = -EIO;
773 goto out_free_dentry;
774 }
775
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 break;
777 }
778 elf_ppnt++;
779 }
780
781 elf_ppnt = elf_phdata;
782 for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++)
Paul Burton774c1052014-09-11 08:30:16 +0100783 switch (elf_ppnt->p_type) {
784 case PT_GNU_STACK:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 if (elf_ppnt->p_flags & PF_X)
786 executable_stack = EXSTACK_ENABLE_X;
787 else
788 executable_stack = EXSTACK_DISABLE_X;
789 break;
Paul Burton774c1052014-09-11 08:30:16 +0100790
791 case PT_LOPROC ... PT_HIPROC:
792 retval = arch_elf_pt_proc(&loc->elf_ex, elf_ppnt,
793 bprm->file, false,
794 &arch_state);
795 if (retval)
796 goto out_free_dentry;
797 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
800 /* Some simple consistency checks for the interpreter */
801 if (elf_interpreter) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 retval = -ELIBBAD;
Andi Kleend20894a2008-02-08 04:21:54 -0800803 /* Not an ELF interpreter */
804 if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 goto out_free_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 /* Verify the interpreter has a valid arch */
Andi Kleend20894a2008-02-08 04:21:54 -0800807 if (!elf_check_arch(&loc->interp_elf_ex))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 goto out_free_dentry;
Paul Burtona9d9ef12014-09-11 08:30:15 +0100809
810 /* Load the interpreter program headers */
811 interp_elf_phdata = load_elf_phdrs(&loc->interp_elf_ex,
812 interpreter);
813 if (!interp_elf_phdata)
814 goto out_free_dentry;
Paul Burton774c1052014-09-11 08:30:16 +0100815
816 /* Pass PT_LOPROC..PT_HIPROC headers to arch code */
817 elf_ppnt = interp_elf_phdata;
818 for (i = 0; i < loc->interp_elf_ex.e_phnum; i++, elf_ppnt++)
819 switch (elf_ppnt->p_type) {
820 case PT_LOPROC ... PT_HIPROC:
821 retval = arch_elf_pt_proc(&loc->interp_elf_ex,
822 elf_ppnt, interpreter,
823 true, &arch_state);
824 if (retval)
825 goto out_free_dentry;
826 break;
827 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 }
829
Paul Burton774c1052014-09-11 08:30:16 +0100830 /*
831 * Allow arch code to reject the ELF at this point, whilst it's
832 * still possible to return an error to the code that invoked
833 * the exec syscall.
834 */
Maciej W. Rozyckieb4bc072015-11-13 00:47:48 +0000835 retval = arch_check_elf(&loc->elf_ex,
836 !!interpreter, &loc->interp_elf_ex,
837 &arch_state);
Paul Burton774c1052014-09-11 08:30:16 +0100838 if (retval)
839 goto out_free_dentry;
840
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 /* Flush all traces of the currently running executable */
842 retval = flush_old_exec(bprm);
843 if (retval)
844 goto out_free_dentry;
845
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 /* Do this immediately, since STACK_TOP as used in setup_arg_pages
847 may depend on the personality. */
Paul Burton774c1052014-09-11 08:30:16 +0100848 SET_PERSONALITY2(loc->elf_ex, &arch_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 if (elf_read_implies_exec(loc->elf_ex, executable_stack))
850 current->personality |= READ_IMPLIES_EXEC;
851
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700852 if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 current->flags |= PF_RANDOMIZE;
Linus Torvalds221af7f2010-01-28 22:14:42 -0800854
855 setup_new_exec(bprm);
Linus Torvalds9f834ec2016-08-22 16:41:46 -0700856 install_exec_creds(bprm);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
858 /* Do this so that we can load the interpreter, if need be. We will
859 change some of these later */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP),
861 executable_stack);
Al Viro19d860a2014-05-04 20:11:36 -0400862 if (retval < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 goto out_free_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 current->mm->start_stack = bprm->p;
866
André Goddard Rosaaf901ca2009-11-14 13:09:05 -0200867 /* Now we do a little grungy work by mmapping the ELF image into
Jiri Kosinacc503c12008-01-30 13:31:07 +0100868 the correct location in memory. */
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700869 for(i = 0, elf_ppnt = elf_phdata;
870 i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 int elf_prot = 0, elf_flags;
872 unsigned long k, vaddr;
Michael Davidsona87938b2015-04-14 15:47:38 -0700873 unsigned long total_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874
875 if (elf_ppnt->p_type != PT_LOAD)
876 continue;
877
878 if (unlikely (elf_brk > elf_bss)) {
879 unsigned long nbyte;
880
881 /* There was a PT_LOAD segment with p_memsz > p_filesz
882 before this one. Map anonymous pages, if needed,
883 and clear the area. */
Mikael Petterssonf670d0e2011-01-12 17:00:02 -0800884 retval = set_brk(elf_bss + load_bias,
885 elf_brk + load_bias);
Al Viro19d860a2014-05-04 20:11:36 -0400886 if (retval)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 goto out_free_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 nbyte = ELF_PAGEOFFSET(elf_bss);
889 if (nbyte) {
890 nbyte = ELF_MIN_ALIGN - nbyte;
891 if (nbyte > elf_brk - elf_bss)
892 nbyte = elf_brk - elf_bss;
893 if (clear_user((void __user *)elf_bss +
894 load_bias, nbyte)) {
895 /*
896 * This bss-zeroing can fail if the ELF
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700897 * file specifies odd protections. So
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 * we don't check the return value
899 */
900 }
901 }
902 }
903
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700904 if (elf_ppnt->p_flags & PF_R)
905 elf_prot |= PROT_READ;
906 if (elf_ppnt->p_flags & PF_W)
907 elf_prot |= PROT_WRITE;
908 if (elf_ppnt->p_flags & PF_X)
909 elf_prot |= PROT_EXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700911 elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912
913 vaddr = elf_ppnt->p_vaddr;
914 if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
915 elf_flags |= MAP_FIXED;
916 } else if (loc->elf_ex.e_type == ET_DYN) {
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700917 /* Try and get dynamic programs out of the way of the
918 * default mmap base, as well as whatever program they
919 * might try to exec. This is because the brk will
920 * follow the loader, and is not movable. */
Kees Cookd1fd8362015-04-14 15:48:07 -0700921 load_bias = ELF_ET_DYN_BASE - vaddr;
Jiri Kosinaa3defbe2011-11-02 13:37:41 -0700922 if (current->flags & PF_RANDOMIZE)
Kees Cookd1fd8362015-04-14 15:48:07 -0700923 load_bias += arch_mmap_rnd();
924 load_bias = ELF_PAGESTART(load_bias);
Michael Davidsona87938b2015-04-14 15:47:38 -0700925 total_size = total_mapping_size(elf_phdata,
926 loc->elf_ex.e_phnum);
927 if (!total_size) {
Andrew Morton2b1d3ae2015-05-28 15:44:24 -0700928 retval = -EINVAL;
Michael Davidsona87938b2015-04-14 15:47:38 -0700929 goto out_free_dentry;
930 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 }
932
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700933 error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
Michael Davidsona87938b2015-04-14 15:47:38 -0700934 elf_prot, elf_flags, total_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 if (BAD_ADDR(error)) {
Alexey Kuznetsovb140f2512007-05-08 00:31:57 -0700936 retval = IS_ERR((void *)error) ?
937 PTR_ERR((void*)error) : -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 goto out_free_dentry;
939 }
940
941 if (!load_addr_set) {
942 load_addr_set = 1;
943 load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
944 if (loc->elf_ex.e_type == ET_DYN) {
945 load_bias += error -
946 ELF_PAGESTART(load_bias + vaddr);
947 load_addr += load_bias;
948 reloc_func_desc = load_bias;
949 }
950 }
951 k = elf_ppnt->p_vaddr;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700952 if (k < start_code)
953 start_code = k;
954 if (start_data < k)
955 start_data = k;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956
957 /*
958 * Check to see if the section's size will overflow the
959 * allowed task size. Note that p_filesz must always be
960 * <= p_memsz so it is only necessary to check p_memsz.
961 */
Chuck Ebbertce510592006-07-03 00:24:14 -0700962 if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 elf_ppnt->p_memsz > TASK_SIZE ||
964 TASK_SIZE - elf_ppnt->p_memsz < k) {
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700965 /* set_brk can never work. Avoid overflows. */
Alexey Kuznetsovb140f2512007-05-08 00:31:57 -0700966 retval = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 goto out_free_dentry;
968 }
969
970 k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
971
972 if (k > elf_bss)
973 elf_bss = k;
974 if ((elf_ppnt->p_flags & PF_X) && end_code < k)
975 end_code = k;
976 if (end_data < k)
977 end_data = k;
978 k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
979 if (k > elf_brk)
980 elf_brk = k;
981 }
982
983 loc->elf_ex.e_entry += load_bias;
984 elf_bss += load_bias;
985 elf_brk += load_bias;
986 start_code += load_bias;
987 end_code += load_bias;
988 start_data += load_bias;
989 end_data += load_bias;
990
991 /* Calling set_brk effectively mmaps the pages that we need
992 * for the bss and break sections. We must do this before
993 * mapping in the interpreter, to make sure it doesn't wind
994 * up getting placed where the bss needs to go.
995 */
996 retval = set_brk(elf_bss, elf_brk);
Al Viro19d860a2014-05-04 20:11:36 -0400997 if (retval)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 goto out_free_dentry;
akpm@osdl.org6de50512005-10-11 08:29:08 -0700999 if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 retval = -EFAULT; /* Nobody gets to see this, but.. */
1001 goto out_free_dentry;
1002 }
1003
1004 if (elf_interpreter) {
Alan Cox6eec4822012-10-04 17:13:42 -07001005 unsigned long interp_map_addr = 0;
Jiri Kosinacc503c12008-01-30 13:31:07 +01001006
Andi Kleend20894a2008-02-08 04:21:54 -08001007 elf_entry = load_elf_interp(&loc->interp_elf_ex,
1008 interpreter,
1009 &interp_map_addr,
Paul Burtona9d9ef12014-09-11 08:30:15 +01001010 load_bias, interp_elf_phdata);
Andi Kleend20894a2008-02-08 04:21:54 -08001011 if (!IS_ERR((void *)elf_entry)) {
1012 /*
1013 * load_elf_interp() returns relocation
1014 * adjustment
1015 */
1016 interp_load_addr = elf_entry;
1017 elf_entry += loc->interp_elf_ex.e_entry;
Jiri Kosinacc503c12008-01-30 13:31:07 +01001018 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 if (BAD_ADDR(elf_entry)) {
Chuck Ebbertce510592006-07-03 00:24:14 -07001020 retval = IS_ERR((void *)elf_entry) ?
1021 (int)elf_entry : -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 goto out_free_dentry;
1023 }
1024 reloc_func_desc = interp_load_addr;
1025
1026 allow_write_access(interpreter);
1027 fput(interpreter);
1028 kfree(elf_interpreter);
1029 } else {
1030 elf_entry = loc->elf_ex.e_entry;
Suresh Siddha5342fba2006-02-26 04:18:28 +01001031 if (BAD_ADDR(elf_entry)) {
Chuck Ebbertce510592006-07-03 00:24:14 -07001032 retval = -EINVAL;
Suresh Siddha5342fba2006-02-26 04:18:28 +01001033 goto out_free_dentry;
1034 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 }
1036
Paul Burton774c1052014-09-11 08:30:16 +01001037 kfree(interp_elf_phdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 kfree(elf_phdata);
1039
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 set_binfmt(&elf_format);
1041
Benjamin Herrenschmidt547ee842005-04-16 15:24:35 -07001042#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
Martin Schwidefskyfc5243d2008-12-25 13:38:35 +01001043 retval = arch_setup_additional_pages(bprm, !!elf_interpreter);
Al Viro19d860a2014-05-04 20:11:36 -04001044 if (retval < 0)
Roland McGrath18c8baf2005-04-28 15:17:19 -07001045 goto out;
Benjamin Herrenschmidt547ee842005-04-16 15:24:35 -07001046#endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
1047
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001048 retval = create_elf_tables(bprm, &loc->elf_ex,
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001049 load_addr, interp_load_addr);
Al Viro19d860a2014-05-04 20:11:36 -04001050 if (retval < 0)
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001051 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 /* N.B. passed_fileno might not be initialized? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 current->mm->end_code = end_code;
1054 current->mm->start_code = start_code;
1055 current->mm->start_data = start_data;
1056 current->mm->end_data = end_data;
1057 current->mm->start_stack = bprm->p;
1058
Jiri Kosina4471a672011-04-14 15:22:09 -07001059 if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) {
Jiri Kosinac1d171a2008-01-30 13:30:40 +01001060 current->mm->brk = current->mm->start_brk =
1061 arch_randomize_brk(current->mm);
Kees Cook204db6e2015-04-14 15:48:12 -07001062#ifdef compat_brk_randomized
Jiri Kosina4471a672011-04-14 15:22:09 -07001063 current->brk_randomized = 1;
1064#endif
1065 }
Jiri Kosinac1d171a2008-01-30 13:30:40 +01001066
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 if (current->personality & MMAP_PAGE_ZERO) {
1068 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
1069 and some applications "depend" upon this behavior.
1070 Since we do not have the power to recompile these, we
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001071 emulate the SVr4 behavior. Sigh. */
Linus Torvalds6be5ceb2012-04-20 17:13:58 -07001072 error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 MAP_FIXED | MAP_PRIVATE, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 }
1075
1076#ifdef ELF_PLAT_INIT
1077 /*
1078 * The ABI may specify that certain registers be set up in special
1079 * ways (on i386 %edx is the address of a DT_FINI function, for
1080 * example. In addition, it may also specify (eg, PowerPC64 ELF)
1081 * that the e_entry field is the address of the function descriptor
1082 * for the startup routine, rather than the address of the startup
1083 * routine itself. This macro performs whatever initialization to
1084 * the regs structure is required as well as any relocations to the
1085 * function descriptor entries when executing dynamically links apps.
1086 */
1087 ELF_PLAT_INIT(regs, reloc_func_desc);
1088#endif
1089
1090 start_thread(regs, elf_entry, bprm->p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 retval = 0;
1092out:
1093 kfree(loc);
1094out_ret:
1095 return retval;
1096
1097 /* error cleanup */
1098out_free_dentry:
Paul Burtona9d9ef12014-09-11 08:30:15 +01001099 kfree(interp_elf_phdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 allow_write_access(interpreter);
1101 if (interpreter)
1102 fput(interpreter);
1103out_free_interp:
Jesper Juhlf99d49a2005-11-07 01:01:34 -08001104 kfree(elf_interpreter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105out_free_ph:
1106 kfree(elf_phdata);
1107 goto out;
1108}
1109
Josh Triplett69369a72014-04-03 14:48:27 -07001110#ifdef CONFIG_USELIB
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111/* This is really simpleminded and specialized - we are loading an
1112 a.out library that is given an ELF header. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113static int load_elf_library(struct file *file)
1114{
1115 struct elf_phdr *elf_phdata;
1116 struct elf_phdr *eppnt;
1117 unsigned long elf_bss, bss, len;
1118 int retval, error, i, j;
1119 struct elfhdr elf_ex;
1120
1121 error = -ENOEXEC;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001122 retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 if (retval != sizeof(elf_ex))
1124 goto out;
1125
1126 if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
1127 goto out;
1128
1129 /* First of all, some simple consistency checks */
1130 if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
Al Viro72c2d532013-09-22 16:27:52 -04001131 !elf_check_arch(&elf_ex) || !file->f_op->mmap)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 goto out;
1133
1134 /* Now read in all of the header information */
1135
1136 j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
1137 /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */
1138
1139 error = -ENOMEM;
1140 elf_phdata = kmalloc(j, GFP_KERNEL);
1141 if (!elf_phdata)
1142 goto out;
1143
1144 eppnt = elf_phdata;
1145 error = -ENOEXEC;
1146 retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j);
1147 if (retval != j)
1148 goto out_free_ph;
1149
1150 for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
1151 if ((eppnt + i)->p_type == PT_LOAD)
1152 j++;
1153 if (j != 1)
1154 goto out_free_ph;
1155
1156 while (eppnt->p_type != PT_LOAD)
1157 eppnt++;
1158
1159 /* Now use mmap to map the library into memory. */
Linus Torvalds6be5ceb2012-04-20 17:13:58 -07001160 error = vm_mmap(file,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 ELF_PAGESTART(eppnt->p_vaddr),
1162 (eppnt->p_filesz +
1163 ELF_PAGEOFFSET(eppnt->p_vaddr)),
1164 PROT_READ | PROT_WRITE | PROT_EXEC,
1165 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
1166 (eppnt->p_offset -
1167 ELF_PAGEOFFSET(eppnt->p_vaddr)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 if (error != ELF_PAGESTART(eppnt->p_vaddr))
1169 goto out_free_ph;
1170
1171 elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
1172 if (padzero(elf_bss)) {
1173 error = -EFAULT;
1174 goto out_free_ph;
1175 }
1176
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001177 len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr +
1178 ELF_MIN_ALIGN - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 bss = eppnt->p_memsz + eppnt->p_vaddr;
Michal Hockoecc2bc82016-05-23 16:25:39 -07001180 if (bss > len) {
1181 error = vm_brk(len, bss - len);
Linus Torvalds5d22fc22016-05-27 15:57:31 -07001182 if (error)
Michal Hockoecc2bc82016-05-23 16:25:39 -07001183 goto out_free_ph;
1184 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 error = 0;
1186
1187out_free_ph:
1188 kfree(elf_phdata);
1189out:
1190 return error;
1191}
Josh Triplett69369a72014-04-03 14:48:27 -07001192#endif /* #ifdef CONFIG_USELIB */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193
Christoph Hellwig698ba7b2009-12-15 16:47:37 -08001194#ifdef CONFIG_ELF_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195/*
1196 * ELF core dumper
1197 *
1198 * Modelled on fs/exec.c:aout_core_dump()
1199 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1200 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201
1202/*
Jason Baron909af762012-03-23 15:02:51 -07001203 * The purpose of always_dump_vma() is to make sure that special kernel mappings
1204 * that are useful for post-mortem analysis are included in every core dump.
1205 * In that way we ensure that the core dump is fully interpretable later
1206 * without matching up the same kernel and hardware config to see what PC values
1207 * meant. These special mappings include - vDSO, vsyscall, and other
1208 * architecture specific mappings
1209 */
1210static bool always_dump_vma(struct vm_area_struct *vma)
1211{
1212 /* Any vsyscall mappings? */
1213 if (vma == get_gate_vma(vma->vm_mm))
1214 return true;
Andy Lutomirski78d683e2014-05-19 15:58:32 -07001215
1216 /*
1217 * Assume that all vmas with a .name op should always be dumped.
1218 * If this changes, a new vm_ops field can easily be added.
1219 */
1220 if (vma->vm_ops && vma->vm_ops->name && vma->vm_ops->name(vma))
1221 return true;
1222
Jason Baron909af762012-03-23 15:02:51 -07001223 /*
1224 * arch_vma_name() returns non-NULL for special architecture mappings,
1225 * such as vDSO sections.
1226 */
1227 if (arch_vma_name(vma))
1228 return true;
1229
1230 return false;
1231}
1232
1233/*
Roland McGrath82df3972007-10-16 23:27:02 -07001234 * Decide what to dump of a segment, part, all or none.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 */
Roland McGrath82df3972007-10-16 23:27:02 -07001236static unsigned long vma_dump_size(struct vm_area_struct *vma,
1237 unsigned long mm_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238{
KOSAKI Motohiroe575f112008-10-18 20:27:08 -07001239#define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type))
1240
Jason Baron909af762012-03-23 15:02:51 -07001241 /* always dump the vdso and vsyscall sections */
1242 if (always_dump_vma(vma))
Roland McGrath82df3972007-10-16 23:27:02 -07001243 goto whole;
Roland McGrathe5b97dd2007-01-26 00:56:48 -08001244
Konstantin Khlebnikov0103bd12012-10-08 16:28:59 -07001245 if (vma->vm_flags & VM_DONTDUMP)
Jason Baronaccb61f2012-03-23 15:02:51 -07001246 return 0;
1247
Ross Zwisler50378352015-10-05 16:33:36 -06001248 /* support for DAX */
1249 if (vma_is_dax(vma)) {
1250 if ((vma->vm_flags & VM_SHARED) && FILTER(DAX_SHARED))
1251 goto whole;
1252 if (!(vma->vm_flags & VM_SHARED) && FILTER(DAX_PRIVATE))
1253 goto whole;
1254 return 0;
1255 }
1256
KOSAKI Motohiroe575f112008-10-18 20:27:08 -07001257 /* Hugetlb memory check */
1258 if (vma->vm_flags & VM_HUGETLB) {
1259 if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED))
1260 goto whole;
1261 if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE))
1262 goto whole;
Naoya Horiguchi23d9e482013-04-17 15:58:28 -07001263 return 0;
KOSAKI Motohiroe575f112008-10-18 20:27:08 -07001264 }
1265
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 /* Do not dump I/O mapped devices or special mappings */
Konstantin Khlebnikov314e51b2012-10-08 16:29:02 -07001267 if (vma->vm_flags & VM_IO)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 return 0;
1269
Kawai, Hidehiroa1b59e82007-07-19 01:48:29 -07001270 /* By default, dump shared memory if mapped from an anonymous file. */
1271 if (vma->vm_flags & VM_SHARED) {
Al Viro496ad9a2013-01-23 17:07:38 -05001272 if (file_inode(vma->vm_file)->i_nlink == 0 ?
Roland McGrath82df3972007-10-16 23:27:02 -07001273 FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED))
1274 goto whole;
1275 return 0;
Kawai, Hidehiroa1b59e82007-07-19 01:48:29 -07001276 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277
Roland McGrath82df3972007-10-16 23:27:02 -07001278 /* Dump segments that have been written to. */
1279 if (vma->anon_vma && FILTER(ANON_PRIVATE))
1280 goto whole;
1281 if (vma->vm_file == NULL)
1282 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283
Roland McGrath82df3972007-10-16 23:27:02 -07001284 if (FILTER(MAPPED_PRIVATE))
1285 goto whole;
1286
1287 /*
1288 * If this looks like the beginning of a DSO or executable mapping,
1289 * check for an ELF header. If we find one, dump the first page to
1290 * aid in determining what was mapped here.
1291 */
Roland McGrath92dc07b2009-02-06 17:34:07 -08001292 if (FILTER(ELF_HEADERS) &&
1293 vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) {
Roland McGrath82df3972007-10-16 23:27:02 -07001294 u32 __user *header = (u32 __user *) vma->vm_start;
1295 u32 word;
Roland McGrath92dc07b2009-02-06 17:34:07 -08001296 mm_segment_t fs = get_fs();
Roland McGrath82df3972007-10-16 23:27:02 -07001297 /*
1298 * Doing it this way gets the constant folded by GCC.
1299 */
1300 union {
1301 u32 cmp;
1302 char elfmag[SELFMAG];
1303 } magic;
1304 BUILD_BUG_ON(SELFMAG != sizeof word);
1305 magic.elfmag[EI_MAG0] = ELFMAG0;
1306 magic.elfmag[EI_MAG1] = ELFMAG1;
1307 magic.elfmag[EI_MAG2] = ELFMAG2;
1308 magic.elfmag[EI_MAG3] = ELFMAG3;
Roland McGrath92dc07b2009-02-06 17:34:07 -08001309 /*
1310 * Switch to the user "segment" for get_user(),
1311 * then put back what elf_core_dump() had in place.
1312 */
1313 set_fs(USER_DS);
1314 if (unlikely(get_user(word, header)))
1315 word = 0;
1316 set_fs(fs);
1317 if (word == magic.cmp)
Roland McGrath82df3972007-10-16 23:27:02 -07001318 return PAGE_SIZE;
1319 }
1320
1321#undef FILTER
1322
1323 return 0;
1324
1325whole:
1326 return vma->vm_end - vma->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327}
1328
Linus Torvalds1da177e2005-04-16 15:20:36 -07001329/* An ELF note in memory */
1330struct memelfnote
1331{
1332 const char *name;
1333 int type;
1334 unsigned int datasz;
1335 void *data;
1336};
1337
1338static int notesize(struct memelfnote *en)
1339{
1340 int sz;
1341
1342 sz = sizeof(struct elf_note);
1343 sz += roundup(strlen(en->name) + 1, 4);
1344 sz += roundup(en->datasz, 4);
1345
1346 return sz;
1347}
1348
Al Viroecc8c772013-10-05 15:32:35 -04001349static int writenote(struct memelfnote *men, struct coredump_params *cprm)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350{
1351 struct elf_note en;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 en.n_namesz = strlen(men->name) + 1;
1353 en.n_descsz = men->datasz;
1354 en.n_type = men->type;
1355
Al Viroecc8c772013-10-05 15:32:35 -04001356 return dump_emit(cprm, &en, sizeof(en)) &&
Al Viro22a8cb82013-10-08 11:05:01 -04001357 dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&
1358 dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360
Roland McGrath3aba4812008-01-30 13:31:44 +01001361static void fill_elf_header(struct elfhdr *elf, int segs,
Zhang Yanfeid3330cf2013-02-21 16:44:20 -08001362 u16 machine, u32 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363{
Cyrill Gorcunov6970c8e2008-04-29 01:01:18 -07001364 memset(elf, 0, sizeof(*elf));
1365
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1367 elf->e_ident[EI_CLASS] = ELF_CLASS;
1368 elf->e_ident[EI_DATA] = ELF_DATA;
1369 elf->e_ident[EI_VERSION] = EV_CURRENT;
1370 elf->e_ident[EI_OSABI] = ELF_OSABI;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371
1372 elf->e_type = ET_CORE;
Roland McGrath3aba4812008-01-30 13:31:44 +01001373 elf->e_machine = machine;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 elf->e_version = EV_CURRENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 elf->e_phoff = sizeof(struct elfhdr);
Roland McGrath3aba4812008-01-30 13:31:44 +01001376 elf->e_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 elf->e_ehsize = sizeof(struct elfhdr);
1378 elf->e_phentsize = sizeof(struct elf_phdr);
1379 elf->e_phnum = segs;
Cyrill Gorcunov6970c8e2008-04-29 01:01:18 -07001380
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 return;
1382}
1383
Andrew Morton8d6b5eee2006-09-25 23:32:04 -07001384static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385{
1386 phdr->p_type = PT_NOTE;
1387 phdr->p_offset = offset;
1388 phdr->p_vaddr = 0;
1389 phdr->p_paddr = 0;
1390 phdr->p_filesz = sz;
1391 phdr->p_memsz = 0;
1392 phdr->p_flags = 0;
1393 phdr->p_align = 0;
1394 return;
1395}
1396
1397static void fill_note(struct memelfnote *note, const char *name, int type,
1398 unsigned int sz, void *data)
1399{
1400 note->name = name;
1401 note->type = type;
1402 note->datasz = sz;
1403 note->data = data;
1404 return;
1405}
1406
1407/*
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001408 * fill up all the fields in prstatus from the given task struct, except
1409 * registers which need to be filled up separately.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 */
1411static void fill_prstatus(struct elf_prstatus *prstatus,
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001412 struct task_struct *p, long signr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413{
1414 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1415 prstatus->pr_sigpend = p->pending.signal.sig[0];
1416 prstatus->pr_sighold = p->blocked.sig[0];
Oleg Nesterov3b34fc52009-06-17 16:27:38 -07001417 rcu_read_lock();
1418 prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1419 rcu_read_unlock();
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001420 prstatus->pr_pid = task_pid_vnr(p);
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001421 prstatus->pr_pgrp = task_pgrp_vnr(p);
1422 prstatus->pr_sid = task_session_vnr(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 if (thread_group_leader(p)) {
Frank Mayharf06febc2008-09-12 09:54:39 -07001424 struct task_cputime cputime;
1425
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 /*
Frank Mayharf06febc2008-09-12 09:54:39 -07001427 * This is the record for the group leader. It shows the
1428 * group-wide total, not its individual thread total.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 */
Frank Mayharf06febc2008-09-12 09:54:39 -07001430 thread_group_cputime(p, &cputime);
1431 cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
1432 cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 } else {
Frederic Weisbecker6fac4822012-11-13 14:20:55 +01001434 cputime_t utime, stime;
1435
1436 task_cputime(p, &utime, &stime);
1437 cputime_to_timeval(utime, &prstatus->pr_utime);
1438 cputime_to_timeval(stime, &prstatus->pr_stime);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439 }
1440 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1441 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1442}
1443
1444static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1445 struct mm_struct *mm)
1446{
David Howellsc69e8d92008-11-14 10:39:19 +11001447 const struct cred *cred;
Greg Kroah-Hartmana84a5052005-05-11 00:10:44 -07001448 unsigned int i, len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001449
1450 /* first copy the parameters from user space */
1451 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1452
1453 len = mm->arg_end - mm->arg_start;
1454 if (len >= ELF_PRARGSZ)
1455 len = ELF_PRARGSZ-1;
1456 if (copy_from_user(&psinfo->pr_psargs,
1457 (const char __user *)mm->arg_start, len))
1458 return -EFAULT;
1459 for(i = 0; i < len; i++)
1460 if (psinfo->pr_psargs[i] == 0)
1461 psinfo->pr_psargs[i] = ' ';
1462 psinfo->pr_psargs[len] = 0;
1463
Oleg Nesterov3b34fc52009-06-17 16:27:38 -07001464 rcu_read_lock();
1465 psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1466 rcu_read_unlock();
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001467 psinfo->pr_pid = task_pid_vnr(p);
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001468 psinfo->pr_pgrp = task_pgrp_vnr(p);
1469 psinfo->pr_sid = task_session_vnr(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470
1471 i = p->state ? ffz(~p->state) + 1 : 0;
1472 psinfo->pr_state = i;
Carsten Otte55148542006-03-25 03:08:22 -08001473 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1475 psinfo->pr_nice = task_nice(p);
1476 psinfo->pr_flag = p->flags;
David Howellsc69e8d92008-11-14 10:39:19 +11001477 rcu_read_lock();
1478 cred = __task_cred(p);
Eric W. Biedermanebc887b2012-02-07 18:36:10 -08001479 SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
1480 SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
David Howellsc69e8d92008-11-14 10:39:19 +11001481 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1483
1484 return 0;
1485}
1486
Roland McGrath3aba4812008-01-30 13:31:44 +01001487static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm)
1488{
1489 elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv;
1490 int i = 0;
1491 do
1492 i += 2;
1493 while (auxv[i - 2] != AT_NULL);
1494 fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);
1495}
1496
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001497static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata,
Al Viroce395962013-10-13 17:23:53 -04001498 const siginfo_t *siginfo)
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001499{
1500 mm_segment_t old_fs = get_fs();
1501 set_fs(KERNEL_DS);
1502 copy_siginfo_to_user((user_siginfo_t __user *) csigdata, siginfo);
1503 set_fs(old_fs);
1504 fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata);
1505}
1506
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001507#define MAX_FILE_NOTE_SIZE (4*1024*1024)
1508/*
1509 * Format of NT_FILE note:
1510 *
1511 * long count -- how many files are mapped
1512 * long page_size -- units for file_ofs
1513 * array of [COUNT] elements of
1514 * long start
1515 * long end
1516 * long file_ofs
1517 * followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL...
1518 */
Dan Aloni72023652013-09-30 13:45:02 -07001519static int fill_files_note(struct memelfnote *note)
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001520{
1521 struct vm_area_struct *vma;
1522 unsigned count, size, names_ofs, remaining, n;
1523 user_long_t *data;
1524 user_long_t *start_end_ofs;
1525 char *name_base, *name_curpos;
1526
1527 /* *Estimated* file count and total data size needed */
1528 count = current->mm->map_count;
1529 size = count * 64;
1530
1531 names_ofs = (2 + 3 * count) * sizeof(data[0]);
1532 alloc:
1533 if (size >= MAX_FILE_NOTE_SIZE) /* paranoia check */
Dan Aloni72023652013-09-30 13:45:02 -07001534 return -EINVAL;
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001535 size = round_up(size, PAGE_SIZE);
1536 data = vmalloc(size);
1537 if (!data)
Dan Aloni72023652013-09-30 13:45:02 -07001538 return -ENOMEM;
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001539
1540 start_end_ofs = data + 2;
1541 name_base = name_curpos = ((char *)data) + names_ofs;
1542 remaining = size - names_ofs;
1543 count = 0;
1544 for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
1545 struct file *file;
1546 const char *filename;
1547
1548 file = vma->vm_file;
1549 if (!file)
1550 continue;
Miklos Szeredi9bf39ab2015-06-19 10:29:13 +02001551 filename = file_path(file, name_curpos, remaining);
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001552 if (IS_ERR(filename)) {
1553 if (PTR_ERR(filename) == -ENAMETOOLONG) {
1554 vfree(data);
1555 size = size * 5 / 4;
1556 goto alloc;
1557 }
1558 continue;
1559 }
1560
Miklos Szeredi9bf39ab2015-06-19 10:29:13 +02001561 /* file_path() fills at the end, move name down */
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001562 /* n = strlen(filename) + 1: */
1563 n = (name_curpos + remaining) - filename;
1564 remaining = filename - name_curpos;
1565 memmove(name_curpos, filename, n);
1566 name_curpos += n;
1567
1568 *start_end_ofs++ = vma->vm_start;
1569 *start_end_ofs++ = vma->vm_end;
1570 *start_end_ofs++ = vma->vm_pgoff;
1571 count++;
1572 }
1573
1574 /* Now we know exact count of files, can store it */
1575 data[0] = count;
1576 data[1] = PAGE_SIZE;
1577 /*
1578 * Count usually is less than current->mm->map_count,
1579 * we need to move filenames down.
1580 */
1581 n = current->mm->map_count - count;
1582 if (n != 0) {
1583 unsigned shift_bytes = n * 3 * sizeof(data[0]);
1584 memmove(name_base - shift_bytes, name_base,
1585 name_curpos - name_base);
1586 name_curpos -= shift_bytes;
1587 }
1588
1589 size = name_curpos - (char *)data;
1590 fill_note(note, "CORE", NT_FILE, size, data);
Dan Aloni72023652013-09-30 13:45:02 -07001591 return 0;
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001592}
1593
Roland McGrath4206d3a2008-01-30 13:31:45 +01001594#ifdef CORE_DUMP_USE_REGSET
1595#include <linux/regset.h>
1596
1597struct elf_thread_core_info {
1598 struct elf_thread_core_info *next;
1599 struct task_struct *task;
1600 struct elf_prstatus prstatus;
1601 struct memelfnote notes[0];
1602};
1603
1604struct elf_note_info {
1605 struct elf_thread_core_info *thread;
1606 struct memelfnote psinfo;
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001607 struct memelfnote signote;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001608 struct memelfnote auxv;
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001609 struct memelfnote files;
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001610 user_siginfo_t csigdata;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001611 size_t size;
1612 int thread_notes;
1613};
1614
Roland McGrathd31472b2008-03-04 14:28:30 -08001615/*
1616 * When a regset has a writeback hook, we call it on each thread before
1617 * dumping user memory. On register window machines, this makes sure the
1618 * user memory backing the register data is up to date before we read it.
1619 */
1620static void do_thread_regset_writeback(struct task_struct *task,
1621 const struct user_regset *regset)
1622{
1623 if (regset->writeback)
1624 regset->writeback(task, regset, 1);
1625}
1626
H. J. Lu0953f65d2012-02-14 13:34:52 -08001627#ifndef PRSTATUS_SIZE
Dmitry Safonov90954e72016-09-05 16:33:06 +03001628#define PRSTATUS_SIZE(S, R) sizeof(S)
H. J. Lu0953f65d2012-02-14 13:34:52 -08001629#endif
1630
1631#ifndef SET_PR_FPVALID
Dmitry Safonov90954e72016-09-05 16:33:06 +03001632#define SET_PR_FPVALID(S, V, R) ((S)->pr_fpvalid = (V))
H. J. Lu0953f65d2012-02-14 13:34:52 -08001633#endif
1634
Roland McGrath4206d3a2008-01-30 13:31:45 +01001635static int fill_thread_core_info(struct elf_thread_core_info *t,
1636 const struct user_regset_view *view,
1637 long signr, size_t *total)
1638{
1639 unsigned int i;
Dmitry Safonov90954e72016-09-05 16:33:06 +03001640 unsigned int regset_size = view->regsets[0].n * view->regsets[0].size;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001641
1642 /*
1643 * NT_PRSTATUS is the one special case, because the regset data
1644 * goes into the pr_reg field inside the note contents, rather
1645 * than being the whole note contents. We fill the reset in here.
1646 * We assume that regset 0 is NT_PRSTATUS.
1647 */
1648 fill_prstatus(&t->prstatus, t->task, signr);
Dmitry Safonov90954e72016-09-05 16:33:06 +03001649 (void) view->regsets[0].get(t->task, &view->regsets[0], 0, regset_size,
1650 &t->prstatus.pr_reg, NULL);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001651
1652 fill_note(&t->notes[0], "CORE", NT_PRSTATUS,
Dmitry Safonov90954e72016-09-05 16:33:06 +03001653 PRSTATUS_SIZE(t->prstatus, regset_size), &t->prstatus);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001654 *total += notesize(&t->notes[0]);
1655
Roland McGrathd31472b2008-03-04 14:28:30 -08001656 do_thread_regset_writeback(t->task, &view->regsets[0]);
1657
Roland McGrath4206d3a2008-01-30 13:31:45 +01001658 /*
1659 * Each other regset might generate a note too. For each regset
1660 * that has no core_note_type or is inactive, we leave t->notes[i]
1661 * all zero and we'll know to skip writing it later.
1662 */
1663 for (i = 1; i < view->n; ++i) {
1664 const struct user_regset *regset = &view->regsets[i];
Roland McGrathd31472b2008-03-04 14:28:30 -08001665 do_thread_regset_writeback(t->task, regset);
H. Peter Anvinc8e25252012-03-02 10:43:48 -08001666 if (regset->core_note_type && regset->get &&
Roland McGrath4206d3a2008-01-30 13:31:45 +01001667 (!regset->active || regset->active(t->task, regset))) {
1668 int ret;
1669 size_t size = regset->n * regset->size;
1670 void *data = kmalloc(size, GFP_KERNEL);
1671 if (unlikely(!data))
1672 return 0;
1673 ret = regset->get(t->task, regset,
1674 0, size, data, NULL);
1675 if (unlikely(ret))
1676 kfree(data);
1677 else {
1678 if (regset->core_note_type != NT_PRFPREG)
1679 fill_note(&t->notes[i], "LINUX",
1680 regset->core_note_type,
1681 size, data);
1682 else {
Dmitry Safonov90954e72016-09-05 16:33:06 +03001683 SET_PR_FPVALID(&t->prstatus,
1684 1, regset_size);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001685 fill_note(&t->notes[i], "CORE",
1686 NT_PRFPREG, size, data);
1687 }
1688 *total += notesize(&t->notes[i]);
1689 }
1690 }
1691 }
1692
1693 return 1;
1694}
1695
1696static int fill_note_info(struct elfhdr *elf, int phdrs,
1697 struct elf_note_info *info,
Al Viroec579412013-10-13 17:57:29 -04001698 const siginfo_t *siginfo, struct pt_regs *regs)
Roland McGrath4206d3a2008-01-30 13:31:45 +01001699{
1700 struct task_struct *dump_task = current;
1701 const struct user_regset_view *view = task_user_regset_view(dump_task);
1702 struct elf_thread_core_info *t;
1703 struct elf_prpsinfo *psinfo;
Oleg Nesterov83914442008-07-25 01:47:45 -07001704 struct core_thread *ct;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001705 unsigned int i;
1706
1707 info->size = 0;
1708 info->thread = NULL;
1709
1710 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
Alan Cox6899e922012-12-17 16:02:09 -08001711 if (psinfo == NULL) {
1712 info->psinfo.data = NULL; /* So we don't free this wrongly */
Roland McGrath4206d3a2008-01-30 13:31:45 +01001713 return 0;
Alan Cox6899e922012-12-17 16:02:09 -08001714 }
Roland McGrath4206d3a2008-01-30 13:31:45 +01001715
Amerigo Wange2dbe122009-07-01 01:06:26 -04001716 fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1717
Roland McGrath4206d3a2008-01-30 13:31:45 +01001718 /*
1719 * Figure out how many notes we're going to need for each thread.
1720 */
1721 info->thread_notes = 0;
1722 for (i = 0; i < view->n; ++i)
1723 if (view->regsets[i].core_note_type != 0)
1724 ++info->thread_notes;
1725
1726 /*
1727 * Sanity check. We rely on regset 0 being in NT_PRSTATUS,
1728 * since it is our one special case.
1729 */
1730 if (unlikely(info->thread_notes == 0) ||
1731 unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) {
1732 WARN_ON(1);
1733 return 0;
1734 }
1735
1736 /*
1737 * Initialize the ELF file header.
1738 */
1739 fill_elf_header(elf, phdrs,
Zhang Yanfeid3330cf2013-02-21 16:44:20 -08001740 view->e_machine, view->e_flags);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001741
1742 /*
1743 * Allocate a structure for each thread.
1744 */
Oleg Nesterov83914442008-07-25 01:47:45 -07001745 for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) {
1746 t = kzalloc(offsetof(struct elf_thread_core_info,
1747 notes[info->thread_notes]),
1748 GFP_KERNEL);
1749 if (unlikely(!t))
1750 return 0;
Oleg Nesterov24d52882008-07-25 01:47:40 -07001751
Oleg Nesterov83914442008-07-25 01:47:45 -07001752 t->task = ct->task;
1753 if (ct->task == dump_task || !info->thread) {
1754 t->next = info->thread;
1755 info->thread = t;
1756 } else {
1757 /*
1758 * Make sure to keep the original task at
1759 * the head of the list.
1760 */
1761 t->next = info->thread->next;
1762 info->thread->next = t;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001763 }
Oleg Nesterov83914442008-07-25 01:47:45 -07001764 }
Roland McGrath4206d3a2008-01-30 13:31:45 +01001765
1766 /*
1767 * Now fill in each thread's information.
1768 */
1769 for (t = info->thread; t != NULL; t = t->next)
Denys Vlasenko5ab1c302012-10-04 17:15:29 -07001770 if (!fill_thread_core_info(t, view, siginfo->si_signo, &info->size))
Roland McGrath4206d3a2008-01-30 13:31:45 +01001771 return 0;
1772
1773 /*
1774 * Fill in the two process-wide notes.
1775 */
1776 fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm);
1777 info->size += notesize(&info->psinfo);
1778
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001779 fill_siginfo_note(&info->signote, &info->csigdata, siginfo);
1780 info->size += notesize(&info->signote);
1781
Roland McGrath4206d3a2008-01-30 13:31:45 +01001782 fill_auxv_note(&info->auxv, current->mm);
1783 info->size += notesize(&info->auxv);
1784
Dan Aloni72023652013-09-30 13:45:02 -07001785 if (fill_files_note(&info->files) == 0)
1786 info->size += notesize(&info->files);
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001787
Roland McGrath4206d3a2008-01-30 13:31:45 +01001788 return 1;
1789}
1790
1791static size_t get_note_info_size(struct elf_note_info *info)
1792{
1793 return info->size;
1794}
1795
1796/*
1797 * Write all the notes for each thread. When writing the first thread, the
1798 * process-wide notes are interleaved after the first thread-specific note.
1799 */
1800static int write_note_info(struct elf_note_info *info,
Al Viroecc8c772013-10-05 15:32:35 -04001801 struct coredump_params *cprm)
Roland McGrath4206d3a2008-01-30 13:31:45 +01001802{
Fabian Frederickb219e252014-06-04 16:12:14 -07001803 bool first = true;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001804 struct elf_thread_core_info *t = info->thread;
1805
1806 do {
1807 int i;
1808
Al Viroecc8c772013-10-05 15:32:35 -04001809 if (!writenote(&t->notes[0], cprm))
Roland McGrath4206d3a2008-01-30 13:31:45 +01001810 return 0;
1811
Al Viroecc8c772013-10-05 15:32:35 -04001812 if (first && !writenote(&info->psinfo, cprm))
Roland McGrath4206d3a2008-01-30 13:31:45 +01001813 return 0;
Al Viroecc8c772013-10-05 15:32:35 -04001814 if (first && !writenote(&info->signote, cprm))
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001815 return 0;
Al Viroecc8c772013-10-05 15:32:35 -04001816 if (first && !writenote(&info->auxv, cprm))
Roland McGrath4206d3a2008-01-30 13:31:45 +01001817 return 0;
Dan Aloni72023652013-09-30 13:45:02 -07001818 if (first && info->files.data &&
Al Viroecc8c772013-10-05 15:32:35 -04001819 !writenote(&info->files, cprm))
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001820 return 0;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001821
1822 for (i = 1; i < info->thread_notes; ++i)
1823 if (t->notes[i].data &&
Al Viroecc8c772013-10-05 15:32:35 -04001824 !writenote(&t->notes[i], cprm))
Roland McGrath4206d3a2008-01-30 13:31:45 +01001825 return 0;
1826
Fabian Frederickb219e252014-06-04 16:12:14 -07001827 first = false;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001828 t = t->next;
1829 } while (t);
1830
1831 return 1;
1832}
1833
1834static void free_note_info(struct elf_note_info *info)
1835{
1836 struct elf_thread_core_info *threads = info->thread;
1837 while (threads) {
1838 unsigned int i;
1839 struct elf_thread_core_info *t = threads;
1840 threads = t->next;
1841 WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus);
1842 for (i = 1; i < info->thread_notes; ++i)
1843 kfree(t->notes[i].data);
1844 kfree(t);
1845 }
1846 kfree(info->psinfo.data);
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001847 vfree(info->files.data);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001848}
1849
1850#else
1851
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852/* Here is the structure in which status of each thread is captured. */
1853struct elf_thread_status
1854{
1855 struct list_head list;
1856 struct elf_prstatus prstatus; /* NT_PRSTATUS */
1857 elf_fpregset_t fpu; /* NT_PRFPREG */
1858 struct task_struct *thread;
1859#ifdef ELF_CORE_COPY_XFPREGS
Mark Nelson5b20cd82007-10-16 23:25:39 -07001860 elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861#endif
1862 struct memelfnote notes[3];
1863 int num_notes;
1864};
1865
1866/*
1867 * In order to add the specific thread information for the elf file format,
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001868 * we need to keep a linked list of every threads pr_status and then create
1869 * a single section for them in the final core file.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870 */
1871static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1872{
1873 int sz = 0;
1874 struct task_struct *p = t->thread;
1875 t->num_notes = 0;
1876
1877 fill_prstatus(&t->prstatus, p, signr);
1878 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1879
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001880 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1881 &(t->prstatus));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 t->num_notes++;
1883 sz += notesize(&t->notes[0]);
1884
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001885 if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL,
1886 &t->fpu))) {
1887 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1888 &(t->fpu));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889 t->num_notes++;
1890 sz += notesize(&t->notes[1]);
1891 }
1892
1893#ifdef ELF_CORE_COPY_XFPREGS
1894 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
Mark Nelson5b20cd82007-10-16 23:25:39 -07001895 fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
1896 sizeof(t->xfpu), &t->xfpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897 t->num_notes++;
1898 sz += notesize(&t->notes[2]);
1899 }
1900#endif
1901 return sz;
1902}
1903
Roland McGrath3aba4812008-01-30 13:31:44 +01001904struct elf_note_info {
1905 struct memelfnote *notes;
Dan Aloni72023652013-09-30 13:45:02 -07001906 struct memelfnote *notes_files;
Roland McGrath3aba4812008-01-30 13:31:44 +01001907 struct elf_prstatus *prstatus; /* NT_PRSTATUS */
1908 struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */
1909 struct list_head thread_list;
1910 elf_fpregset_t *fpu;
1911#ifdef ELF_CORE_COPY_XFPREGS
1912 elf_fpxregset_t *xfpu;
1913#endif
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001914 user_siginfo_t csigdata;
Roland McGrath3aba4812008-01-30 13:31:44 +01001915 int thread_status_size;
1916 int numnote;
1917};
1918
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001919static int elf_note_info_init(struct elf_note_info *info)
Roland McGrath3aba4812008-01-30 13:31:44 +01001920{
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001921 memset(info, 0, sizeof(*info));
Roland McGrath3aba4812008-01-30 13:31:44 +01001922 INIT_LIST_HEAD(&info->thread_list);
1923
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001924 /* Allocate space for ELF notes */
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001925 info->notes = kmalloc(8 * sizeof(struct memelfnote), GFP_KERNEL);
Roland McGrath3aba4812008-01-30 13:31:44 +01001926 if (!info->notes)
1927 return 0;
1928 info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
1929 if (!info->psinfo)
Denys Vlasenkof34f9d12012-09-26 11:34:50 +10001930 return 0;
Roland McGrath3aba4812008-01-30 13:31:44 +01001931 info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL);
1932 if (!info->prstatus)
Denys Vlasenkof34f9d12012-09-26 11:34:50 +10001933 return 0;
Roland McGrath3aba4812008-01-30 13:31:44 +01001934 info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
1935 if (!info->fpu)
Denys Vlasenkof34f9d12012-09-26 11:34:50 +10001936 return 0;
Roland McGrath3aba4812008-01-30 13:31:44 +01001937#ifdef ELF_CORE_COPY_XFPREGS
1938 info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL);
1939 if (!info->xfpu)
Denys Vlasenkof34f9d12012-09-26 11:34:50 +10001940 return 0;
Roland McGrath3aba4812008-01-30 13:31:44 +01001941#endif
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001942 return 1;
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001943}
Roland McGrath3aba4812008-01-30 13:31:44 +01001944
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001945static int fill_note_info(struct elfhdr *elf, int phdrs,
1946 struct elf_note_info *info,
Al Viroec579412013-10-13 17:57:29 -04001947 const siginfo_t *siginfo, struct pt_regs *regs)
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001948{
1949 struct list_head *t;
Al Viroafabada2013-10-14 07:39:56 -04001950 struct core_thread *ct;
1951 struct elf_thread_status *ets;
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001952
1953 if (!elf_note_info_init(info))
1954 return 0;
1955
Al Viroafabada2013-10-14 07:39:56 -04001956 for (ct = current->mm->core_state->dumper.next;
1957 ct; ct = ct->next) {
1958 ets = kzalloc(sizeof(*ets), GFP_KERNEL);
1959 if (!ets)
1960 return 0;
Oleg Nesterov24d52882008-07-25 01:47:40 -07001961
Al Viroafabada2013-10-14 07:39:56 -04001962 ets->thread = ct->task;
1963 list_add(&ets->list, &info->thread_list);
1964 }
Oleg Nesterov83914442008-07-25 01:47:45 -07001965
Al Viroafabada2013-10-14 07:39:56 -04001966 list_for_each(t, &info->thread_list) {
1967 int sz;
Oleg Nesterov83914442008-07-25 01:47:45 -07001968
Al Viroafabada2013-10-14 07:39:56 -04001969 ets = list_entry(t, struct elf_thread_status, list);
1970 sz = elf_dump_thread_status(siginfo->si_signo, ets);
1971 info->thread_status_size += sz;
Roland McGrath3aba4812008-01-30 13:31:44 +01001972 }
1973 /* now collect the dump for the current */
1974 memset(info->prstatus, 0, sizeof(*info->prstatus));
Denys Vlasenko5ab1c302012-10-04 17:15:29 -07001975 fill_prstatus(info->prstatus, current, siginfo->si_signo);
Roland McGrath3aba4812008-01-30 13:31:44 +01001976 elf_core_copy_regs(&info->prstatus->pr_reg, regs);
1977
1978 /* Set up header */
Zhang Yanfeid3330cf2013-02-21 16:44:20 -08001979 fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS);
Roland McGrath3aba4812008-01-30 13:31:44 +01001980
1981 /*
1982 * Set up the notes in similar form to SVR4 core dumps made
1983 * with info from their /proc.
1984 */
1985
1986 fill_note(info->notes + 0, "CORE", NT_PRSTATUS,
1987 sizeof(*info->prstatus), info->prstatus);
1988 fill_psinfo(info->psinfo, current->group_leader, current->mm);
1989 fill_note(info->notes + 1, "CORE", NT_PRPSINFO,
1990 sizeof(*info->psinfo), info->psinfo);
1991
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001992 fill_siginfo_note(info->notes + 2, &info->csigdata, siginfo);
1993 fill_auxv_note(info->notes + 3, current->mm);
Dan Aloni72023652013-09-30 13:45:02 -07001994 info->numnote = 4;
Roland McGrath3aba4812008-01-30 13:31:44 +01001995
Dan Aloni72023652013-09-30 13:45:02 -07001996 if (fill_files_note(info->notes + info->numnote) == 0) {
1997 info->notes_files = info->notes + info->numnote;
1998 info->numnote++;
1999 }
Roland McGrath3aba4812008-01-30 13:31:44 +01002000
2001 /* Try to dump the FPU. */
2002 info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs,
2003 info->fpu);
2004 if (info->prstatus->pr_fpvalid)
2005 fill_note(info->notes + info->numnote++,
2006 "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu);
2007#ifdef ELF_CORE_COPY_XFPREGS
2008 if (elf_core_copy_task_xfpregs(current, info->xfpu))
2009 fill_note(info->notes + info->numnote++,
2010 "LINUX", ELF_CORE_XFPREG_TYPE,
2011 sizeof(*info->xfpu), info->xfpu);
2012#endif
2013
2014 return 1;
Roland McGrath3aba4812008-01-30 13:31:44 +01002015}
2016
2017static size_t get_note_info_size(struct elf_note_info *info)
2018{
2019 int sz = 0;
2020 int i;
2021
2022 for (i = 0; i < info->numnote; i++)
2023 sz += notesize(info->notes + i);
2024
2025 sz += info->thread_status_size;
2026
2027 return sz;
2028}
2029
2030static int write_note_info(struct elf_note_info *info,
Al Viroecc8c772013-10-05 15:32:35 -04002031 struct coredump_params *cprm)
Roland McGrath3aba4812008-01-30 13:31:44 +01002032{
2033 int i;
2034 struct list_head *t;
2035
2036 for (i = 0; i < info->numnote; i++)
Al Viroecc8c772013-10-05 15:32:35 -04002037 if (!writenote(info->notes + i, cprm))
Roland McGrath3aba4812008-01-30 13:31:44 +01002038 return 0;
2039
2040 /* write out the thread status notes section */
2041 list_for_each(t, &info->thread_list) {
2042 struct elf_thread_status *tmp =
2043 list_entry(t, struct elf_thread_status, list);
2044
2045 for (i = 0; i < tmp->num_notes; i++)
Al Viroecc8c772013-10-05 15:32:35 -04002046 if (!writenote(&tmp->notes[i], cprm))
Roland McGrath3aba4812008-01-30 13:31:44 +01002047 return 0;
2048 }
2049
2050 return 1;
2051}
2052
2053static void free_note_info(struct elf_note_info *info)
2054{
2055 while (!list_empty(&info->thread_list)) {
2056 struct list_head *tmp = info->thread_list.next;
2057 list_del(tmp);
2058 kfree(list_entry(tmp, struct elf_thread_status, list));
2059 }
2060
Dan Aloni72023652013-09-30 13:45:02 -07002061 /* Free data possibly allocated by fill_files_note(): */
2062 if (info->notes_files)
2063 vfree(info->notes_files->data);
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07002064
Roland McGrath3aba4812008-01-30 13:31:44 +01002065 kfree(info->prstatus);
2066 kfree(info->psinfo);
2067 kfree(info->notes);
2068 kfree(info->fpu);
2069#ifdef ELF_CORE_COPY_XFPREGS
2070 kfree(info->xfpu);
2071#endif
2072}
2073
Roland McGrath4206d3a2008-01-30 13:31:45 +01002074#endif
2075
Roland McGrathf47aef52007-01-26 00:56:49 -08002076static struct vm_area_struct *first_vma(struct task_struct *tsk,
2077 struct vm_area_struct *gate_vma)
2078{
2079 struct vm_area_struct *ret = tsk->mm->mmap;
2080
2081 if (ret)
2082 return ret;
2083 return gate_vma;
2084}
2085/*
2086 * Helper function for iterating across a vma list. It ensures that the caller
2087 * will visit `gate_vma' prior to terminating the search.
2088 */
2089static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
2090 struct vm_area_struct *gate_vma)
2091{
2092 struct vm_area_struct *ret;
2093
2094 ret = this_vma->vm_next;
2095 if (ret)
2096 return ret;
2097 if (this_vma == gate_vma)
2098 return NULL;
2099 return gate_vma;
2100}
2101
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002102static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
2103 elf_addr_t e_shoff, int segs)
2104{
2105 elf->e_shoff = e_shoff;
2106 elf->e_shentsize = sizeof(*shdr4extnum);
2107 elf->e_shnum = 1;
2108 elf->e_shstrndx = SHN_UNDEF;
2109
2110 memset(shdr4extnum, 0, sizeof(*shdr4extnum));
2111
2112 shdr4extnum->sh_type = SHT_NULL;
2113 shdr4extnum->sh_size = elf->e_shnum;
2114 shdr4extnum->sh_link = elf->e_shstrndx;
2115 shdr4extnum->sh_info = segs;
2116}
2117
Linus Torvalds1da177e2005-04-16 15:20:36 -07002118/*
2119 * Actual dumper
2120 *
2121 * This is a two-pass process; first we find the offsets of the bits,
2122 * and then they are actually written out. If we run out of core limit
2123 * we just truncate.
2124 */
Masami Hiramatsuf6151df2009-12-17 15:27:16 -08002125static int elf_core_dump(struct coredump_params *cprm)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002127 int has_dumped = 0;
2128 mm_segment_t fs;
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002129 int segs, i;
2130 size_t vma_data_size = 0;
Roland McGrathf47aef52007-01-26 00:56:49 -08002131 struct vm_area_struct *vma, *gate_vma;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002132 struct elfhdr *elf = NULL;
Al Virocdc3d562013-10-05 22:24:29 -04002133 loff_t offset = 0, dataoff;
Dan Aloni72023652013-09-30 13:45:02 -07002134 struct elf_note_info info = { };
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002135 struct elf_phdr *phdr4note = NULL;
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002136 struct elf_shdr *shdr4extnum = NULL;
2137 Elf_Half e_phnum;
2138 elf_addr_t e_shoff;
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002139 elf_addr_t *vma_filesz = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002140
2141 /*
2142 * We no longer stop all VM operations.
2143 *
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07002144 * This is because those proceses that could possibly change map_count
2145 * or the mmap / vma pages are now blocked in do_exit on current
2146 * finishing this core dump.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002147 *
2148 * Only ptrace can touch these memory addresses, but it doesn't change
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07002149 * the map_count or the pages allocated. So no possibility of crashing
Linus Torvalds1da177e2005-04-16 15:20:36 -07002150 * exists while dumping the mm->vm_next areas to the core file.
2151 */
2152
2153 /* alloc memory for large data structures: too large to be on stack */
2154 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
2155 if (!elf)
WANG Cong5f719552008-05-06 12:45:35 +08002156 goto out;
KAMEZAWA Hiroyuki341c87b2009-06-30 11:41:23 -07002157 /*
2158 * The number of segs are recored into ELF header as 16bit value.
2159 * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here.
2160 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161 segs = current->mm->map_count;
Daisuke HATAYAMA1fcccba2010-03-05 13:44:07 -08002162 segs += elf_core_extra_phdrs();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002163
Stephen Wilson31db58b2011-03-13 15:49:15 -04002164 gate_vma = get_gate_vma(current->mm);
Roland McGrathf47aef52007-01-26 00:56:49 -08002165 if (gate_vma != NULL)
2166 segs++;
2167
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002168 /* for notes section */
2169 segs++;
2170
2171 /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
2172 * this, kernel supports extended numbering. Have a look at
2173 * include/linux/elf.h for further information. */
2174 e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
2175
Roland McGrath3aba4812008-01-30 13:31:44 +01002176 /*
2177 * Collect all the non-memory information about the process for the
2178 * notes. This also sets up the file header.
2179 */
Denys Vlasenko5ab1c302012-10-04 17:15:29 -07002180 if (!fill_note_info(elf, e_phnum, &info, cprm->siginfo, cprm->regs))
Roland McGrath3aba4812008-01-30 13:31:44 +01002181 goto cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002182
2183 has_dumped = 1;
Oleg Nesterov079148b2013-04-30 15:28:16 -07002184
Linus Torvalds1da177e2005-04-16 15:20:36 -07002185 fs = get_fs();
2186 set_fs(KERNEL_DS);
2187
Linus Torvalds1da177e2005-04-16 15:20:36 -07002188 offset += sizeof(*elf); /* Elf header */
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002189 offset += segs * sizeof(struct elf_phdr); /* Program headers */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002190
2191 /* Write notes phdr entry */
2192 {
Roland McGrath3aba4812008-01-30 13:31:44 +01002193 size_t sz = get_note_info_size(&info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002194
Michael Ellermane5501492007-09-19 14:38:12 +10002195 sz += elf_coredump_extra_notes_size();
Dwayne Grant McConnellbf1ab972006-11-23 00:46:37 +01002196
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002197 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
2198 if (!phdr4note)
Daisuke HATAYAMA088e7af2010-03-05 13:44:06 -08002199 goto end_coredump;
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002200
2201 fill_elf_note_phdr(phdr4note, sz, offset);
2202 offset += sz;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203 }
2204
Linus Torvalds1da177e2005-04-16 15:20:36 -07002205 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
2206
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002207 vma_filesz = kmalloc_array(segs - 1, sizeof(*vma_filesz), GFP_KERNEL);
2208 if (!vma_filesz)
2209 goto end_coredump;
2210
2211 for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
2212 vma = next_vma(vma, gate_vma)) {
2213 unsigned long dump_size;
2214
2215 dump_size = vma_dump_size(vma, cprm->mm_flags);
2216 vma_filesz[i++] = dump_size;
2217 vma_data_size += dump_size;
2218 }
2219
2220 offset += vma_data_size;
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002221 offset += elf_core_extra_data_size();
2222 e_shoff = offset;
2223
2224 if (e_phnum == PN_XNUM) {
2225 shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
2226 if (!shdr4extnum)
2227 goto end_coredump;
2228 fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
2229 }
2230
2231 offset = dataoff;
2232
Al Viroecc8c772013-10-05 15:32:35 -04002233 if (!dump_emit(cprm, elf, sizeof(*elf)))
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002234 goto end_coredump;
2235
Al Viroecc8c772013-10-05 15:32:35 -04002236 if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note)))
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002237 goto end_coredump;
2238
Linus Torvalds1da177e2005-04-16 15:20:36 -07002239 /* Write program headers for segments dump */
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002240 for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
Roland McGrathf47aef52007-01-26 00:56:49 -08002241 vma = next_vma(vma, gate_vma)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242 struct elf_phdr phdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002243
2244 phdr.p_type = PT_LOAD;
2245 phdr.p_offset = offset;
2246 phdr.p_vaddr = vma->vm_start;
2247 phdr.p_paddr = 0;
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002248 phdr.p_filesz = vma_filesz[i++];
Roland McGrath82df3972007-10-16 23:27:02 -07002249 phdr.p_memsz = vma->vm_end - vma->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002250 offset += phdr.p_filesz;
2251 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07002252 if (vma->vm_flags & VM_WRITE)
2253 phdr.p_flags |= PF_W;
2254 if (vma->vm_flags & VM_EXEC)
2255 phdr.p_flags |= PF_X;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256 phdr.p_align = ELF_EXEC_PAGESIZE;
2257
Al Viroecc8c772013-10-05 15:32:35 -04002258 if (!dump_emit(cprm, &phdr, sizeof(phdr)))
Daisuke HATAYAMA088e7af2010-03-05 13:44:06 -08002259 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002260 }
2261
Al Viro506f21c2013-10-05 17:22:57 -04002262 if (!elf_core_write_extra_phdrs(cprm, offset))
Daisuke HATAYAMA1fcccba2010-03-05 13:44:07 -08002263 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264
2265 /* write out the notes section */
Al Viroecc8c772013-10-05 15:32:35 -04002266 if (!write_note_info(&info, cprm))
Roland McGrath3aba4812008-01-30 13:31:44 +01002267 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002268
Al Virocdc3d562013-10-05 22:24:29 -04002269 if (elf_coredump_extra_notes_write(cprm))
Michael Ellermane5501492007-09-19 14:38:12 +10002270 goto end_coredump;
Dwayne Grant McConnellbf1ab972006-11-23 00:46:37 +01002271
Andi Kleend025c9d2006-09-30 23:29:28 -07002272 /* Align to page */
Mateusz Guzik1607f092016-06-05 23:14:14 +02002273 if (!dump_skip(cprm, dataoff - cprm->pos))
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002274 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002275
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002276 for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
Roland McGrathf47aef52007-01-26 00:56:49 -08002277 vma = next_vma(vma, gate_vma)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002278 unsigned long addr;
Roland McGrath82df3972007-10-16 23:27:02 -07002279 unsigned long end;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002280
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002281 end = vma->vm_start + vma_filesz[i++];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282
Roland McGrath82df3972007-10-16 23:27:02 -07002283 for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) {
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07002284 struct page *page;
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002285 int stop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002286
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002287 page = get_dump_page(addr);
2288 if (page) {
2289 void *kaddr = kmap(page);
Al Viro13046ec2013-10-05 18:08:47 -04002290 stop = !dump_emit(cprm, kaddr, PAGE_SIZE);
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002291 kunmap(page);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03002292 put_page(page);
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002293 } else
Al Viro9b56d542013-10-08 09:26:08 -04002294 stop = !dump_skip(cprm, PAGE_SIZE);
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002295 if (stop)
2296 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002297 }
2298 }
Dave Kleikamp68a5dc32017-01-11 13:25:00 -06002299 dump_truncate(cprm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002300
Al Viroaa3e7ea2013-10-05 17:50:15 -04002301 if (!elf_core_write_extra_data(cprm))
Daisuke HATAYAMA1fcccba2010-03-05 13:44:07 -08002302 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002304 if (e_phnum == PN_XNUM) {
Al Viro13046ec2013-10-05 18:08:47 -04002305 if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum)))
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002306 goto end_coredump;
2307 }
2308
Linus Torvalds1da177e2005-04-16 15:20:36 -07002309end_coredump:
2310 set_fs(fs);
2311
2312cleanup:
Roland McGrath3aba4812008-01-30 13:31:44 +01002313 free_note_info(&info);
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002314 kfree(shdr4extnum);
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002315 kfree(vma_filesz);
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002316 kfree(phdr4note);
WANG Cong5f719552008-05-06 12:45:35 +08002317 kfree(elf);
2318out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319 return has_dumped;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002320}
2321
Christoph Hellwig698ba7b2009-12-15 16:47:37 -08002322#endif /* CONFIG_ELF_CORE */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002323
2324static int __init init_elf_binfmt(void)
2325{
Al Viro8fc3dc52012-03-17 03:05:16 -04002326 register_binfmt(&elf_format);
2327 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002328}
2329
2330static void __exit exit_elf_binfmt(void)
2331{
2332 /* Remove the COFF and ELF loaders. */
2333 unregister_binfmt(&elf_format);
2334}
2335
2336core_initcall(init_elf_binfmt);
2337module_exit(exit_elf_binfmt);
2338MODULE_LICENSE("GPL");