blob: 1fdf4e5bf8c685052b3211a4ed65495beda37cd4 [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;
Kees Cook63c2f8f2017-07-10 15:52:37 -0700914 /*
915 * If we are loading ET_EXEC or we have already performed
916 * the ET_DYN load_addr calculations, proceed normally.
917 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
919 elf_flags |= MAP_FIXED;
920 } else if (loc->elf_ex.e_type == ET_DYN) {
Kees Cook63c2f8f2017-07-10 15:52:37 -0700921 /*
922 * This logic is run once for the first LOAD Program
923 * Header for ET_DYN binaries to calculate the
924 * randomization (load_bias) for all the LOAD
925 * Program Headers, and to calculate the entire
926 * size of the ELF mapping (total_size). (Note that
927 * load_addr_set is set to true later once the
928 * initial mapping is performed.)
929 *
930 * There are effectively two types of ET_DYN
931 * binaries: programs (i.e. PIE: ET_DYN with INTERP)
932 * and loaders (ET_DYN without INTERP, since they
933 * _are_ the ELF interpreter). The loaders must
934 * be loaded away from programs since the program
935 * may otherwise collide with the loader (especially
936 * for ET_EXEC which does not have a randomized
937 * position). For example to handle invocations of
938 * "./ld.so someprog" to test out a new version of
939 * the loader, the subsequent program that the
940 * loader loads must avoid the loader itself, so
941 * they cannot share the same load range. Sufficient
942 * room for the brk must be allocated with the
943 * loader as well, since brk must be available with
944 * the loader.
945 *
946 * Therefore, programs are loaded offset from
947 * ELF_ET_DYN_BASE and loaders are loaded into the
948 * independently randomized mmap region (0 load_bias
949 * without MAP_FIXED).
950 */
951 if (elf_interpreter) {
952 load_bias = ELF_ET_DYN_BASE;
953 if (current->flags & PF_RANDOMIZE)
954 load_bias += arch_mmap_rnd();
955 elf_flags |= MAP_FIXED;
956 } else
957 load_bias = 0;
958
959 /*
960 * Since load_bias is used for all subsequent loading
961 * calculations, we must lower it by the first vaddr
962 * so that the remaining calculations based on the
963 * ELF vaddrs will be correctly offset. The result
964 * is then page aligned.
965 */
966 load_bias = ELF_PAGESTART(load_bias - vaddr);
967
Michael Davidsona87938b2015-04-14 15:47:38 -0700968 total_size = total_mapping_size(elf_phdata,
969 loc->elf_ex.e_phnum);
970 if (!total_size) {
Andrew Morton2b1d3ae2015-05-28 15:44:24 -0700971 retval = -EINVAL;
Michael Davidsona87938b2015-04-14 15:47:38 -0700972 goto out_free_dentry;
973 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 }
975
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700976 error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
Michael Davidsona87938b2015-04-14 15:47:38 -0700977 elf_prot, elf_flags, total_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 if (BAD_ADDR(error)) {
Alexey Kuznetsovb140f2512007-05-08 00:31:57 -0700979 retval = IS_ERR((void *)error) ?
980 PTR_ERR((void*)error) : -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 goto out_free_dentry;
982 }
983
984 if (!load_addr_set) {
985 load_addr_set = 1;
986 load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
987 if (loc->elf_ex.e_type == ET_DYN) {
988 load_bias += error -
989 ELF_PAGESTART(load_bias + vaddr);
990 load_addr += load_bias;
991 reloc_func_desc = load_bias;
992 }
993 }
994 k = elf_ppnt->p_vaddr;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -0700995 if (k < start_code)
996 start_code = k;
997 if (start_data < k)
998 start_data = k;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
1000 /*
1001 * Check to see if the section's size will overflow the
1002 * allowed task size. Note that p_filesz must always be
1003 * <= p_memsz so it is only necessary to check p_memsz.
1004 */
Chuck Ebbertce510592006-07-03 00:24:14 -07001005 if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 elf_ppnt->p_memsz > TASK_SIZE ||
1007 TASK_SIZE - elf_ppnt->p_memsz < k) {
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001008 /* set_brk can never work. Avoid overflows. */
Alexey Kuznetsovb140f2512007-05-08 00:31:57 -07001009 retval = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 goto out_free_dentry;
1011 }
1012
1013 k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
1014
1015 if (k > elf_bss)
1016 elf_bss = k;
1017 if ((elf_ppnt->p_flags & PF_X) && end_code < k)
1018 end_code = k;
1019 if (end_data < k)
1020 end_data = k;
1021 k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
1022 if (k > elf_brk)
1023 elf_brk = k;
1024 }
1025
1026 loc->elf_ex.e_entry += load_bias;
1027 elf_bss += load_bias;
1028 elf_brk += load_bias;
1029 start_code += load_bias;
1030 end_code += load_bias;
1031 start_data += load_bias;
1032 end_data += load_bias;
1033
1034 /* Calling set_brk effectively mmaps the pages that we need
1035 * for the bss and break sections. We must do this before
1036 * mapping in the interpreter, to make sure it doesn't wind
1037 * up getting placed where the bss needs to go.
1038 */
1039 retval = set_brk(elf_bss, elf_brk);
Al Viro19d860a2014-05-04 20:11:36 -04001040 if (retval)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 goto out_free_dentry;
akpm@osdl.org6de50512005-10-11 08:29:08 -07001042 if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 retval = -EFAULT; /* Nobody gets to see this, but.. */
1044 goto out_free_dentry;
1045 }
1046
1047 if (elf_interpreter) {
Alan Cox6eec4822012-10-04 17:13:42 -07001048 unsigned long interp_map_addr = 0;
Jiri Kosinacc503c12008-01-30 13:31:07 +01001049
Andi Kleend20894a2008-02-08 04:21:54 -08001050 elf_entry = load_elf_interp(&loc->interp_elf_ex,
1051 interpreter,
1052 &interp_map_addr,
Paul Burtona9d9ef12014-09-11 08:30:15 +01001053 load_bias, interp_elf_phdata);
Andi Kleend20894a2008-02-08 04:21:54 -08001054 if (!IS_ERR((void *)elf_entry)) {
1055 /*
1056 * load_elf_interp() returns relocation
1057 * adjustment
1058 */
1059 interp_load_addr = elf_entry;
1060 elf_entry += loc->interp_elf_ex.e_entry;
Jiri Kosinacc503c12008-01-30 13:31:07 +01001061 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 if (BAD_ADDR(elf_entry)) {
Chuck Ebbertce510592006-07-03 00:24:14 -07001063 retval = IS_ERR((void *)elf_entry) ?
1064 (int)elf_entry : -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 goto out_free_dentry;
1066 }
1067 reloc_func_desc = interp_load_addr;
1068
1069 allow_write_access(interpreter);
1070 fput(interpreter);
1071 kfree(elf_interpreter);
1072 } else {
1073 elf_entry = loc->elf_ex.e_entry;
Suresh Siddha5342fba2006-02-26 04:18:28 +01001074 if (BAD_ADDR(elf_entry)) {
Chuck Ebbertce510592006-07-03 00:24:14 -07001075 retval = -EINVAL;
Suresh Siddha5342fba2006-02-26 04:18:28 +01001076 goto out_free_dentry;
1077 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 }
1079
Paul Burton774c1052014-09-11 08:30:16 +01001080 kfree(interp_elf_phdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 kfree(elf_phdata);
1082
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 set_binfmt(&elf_format);
1084
Benjamin Herrenschmidt547ee842005-04-16 15:24:35 -07001085#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
Martin Schwidefskyfc5243d2008-12-25 13:38:35 +01001086 retval = arch_setup_additional_pages(bprm, !!elf_interpreter);
Al Viro19d860a2014-05-04 20:11:36 -04001087 if (retval < 0)
Roland McGrath18c8baf2005-04-28 15:17:19 -07001088 goto out;
Benjamin Herrenschmidt547ee842005-04-16 15:24:35 -07001089#endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
1090
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001091 retval = create_elf_tables(bprm, &loc->elf_ex,
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001092 load_addr, interp_load_addr);
Al Viro19d860a2014-05-04 20:11:36 -04001093 if (retval < 0)
Ollie Wildb6a2fea2007-07-19 01:48:16 -07001094 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 /* N.B. passed_fileno might not be initialized? */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 current->mm->end_code = end_code;
1097 current->mm->start_code = start_code;
1098 current->mm->start_data = start_data;
1099 current->mm->end_data = end_data;
1100 current->mm->start_stack = bprm->p;
1101
Jiri Kosina4471a672011-04-14 15:22:09 -07001102 if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) {
Jiri Kosinac1d171a2008-01-30 13:30:40 +01001103 current->mm->brk = current->mm->start_brk =
1104 arch_randomize_brk(current->mm);
Kees Cook204db6e2015-04-14 15:48:12 -07001105#ifdef compat_brk_randomized
Jiri Kosina4471a672011-04-14 15:22:09 -07001106 current->brk_randomized = 1;
1107#endif
1108 }
Jiri Kosinac1d171a2008-01-30 13:30:40 +01001109
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 if (current->personality & MMAP_PAGE_ZERO) {
1111 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
1112 and some applications "depend" upon this behavior.
1113 Since we do not have the power to recompile these, we
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001114 emulate the SVr4 behavior. Sigh. */
Linus Torvalds6be5ceb2012-04-20 17:13:58 -07001115 error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 MAP_FIXED | MAP_PRIVATE, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 }
1118
1119#ifdef ELF_PLAT_INIT
1120 /*
1121 * The ABI may specify that certain registers be set up in special
1122 * ways (on i386 %edx is the address of a DT_FINI function, for
1123 * example. In addition, it may also specify (eg, PowerPC64 ELF)
1124 * that the e_entry field is the address of the function descriptor
1125 * for the startup routine, rather than the address of the startup
1126 * routine itself. This macro performs whatever initialization to
1127 * the regs structure is required as well as any relocations to the
1128 * function descriptor entries when executing dynamically links apps.
1129 */
1130 ELF_PLAT_INIT(regs, reloc_func_desc);
1131#endif
1132
1133 start_thread(regs, elf_entry, bprm->p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 retval = 0;
1135out:
1136 kfree(loc);
1137out_ret:
1138 return retval;
1139
1140 /* error cleanup */
1141out_free_dentry:
Paul Burtona9d9ef12014-09-11 08:30:15 +01001142 kfree(interp_elf_phdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 allow_write_access(interpreter);
1144 if (interpreter)
1145 fput(interpreter);
1146out_free_interp:
Jesper Juhlf99d49a2005-11-07 01:01:34 -08001147 kfree(elf_interpreter);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148out_free_ph:
1149 kfree(elf_phdata);
1150 goto out;
1151}
1152
Josh Triplett69369a72014-04-03 14:48:27 -07001153#ifdef CONFIG_USELIB
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154/* This is really simpleminded and specialized - we are loading an
1155 a.out library that is given an ELF header. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156static int load_elf_library(struct file *file)
1157{
1158 struct elf_phdr *elf_phdata;
1159 struct elf_phdr *eppnt;
1160 unsigned long elf_bss, bss, len;
1161 int retval, error, i, j;
1162 struct elfhdr elf_ex;
1163
1164 error = -ENOEXEC;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001165 retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 if (retval != sizeof(elf_ex))
1167 goto out;
1168
1169 if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
1170 goto out;
1171
1172 /* First of all, some simple consistency checks */
1173 if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
Al Viro72c2d532013-09-22 16:27:52 -04001174 !elf_check_arch(&elf_ex) || !file->f_op->mmap)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 goto out;
1176
1177 /* Now read in all of the header information */
1178
1179 j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
1180 /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */
1181
1182 error = -ENOMEM;
1183 elf_phdata = kmalloc(j, GFP_KERNEL);
1184 if (!elf_phdata)
1185 goto out;
1186
1187 eppnt = elf_phdata;
1188 error = -ENOEXEC;
1189 retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j);
1190 if (retval != j)
1191 goto out_free_ph;
1192
1193 for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
1194 if ((eppnt + i)->p_type == PT_LOAD)
1195 j++;
1196 if (j != 1)
1197 goto out_free_ph;
1198
1199 while (eppnt->p_type != PT_LOAD)
1200 eppnt++;
1201
1202 /* Now use mmap to map the library into memory. */
Linus Torvalds6be5ceb2012-04-20 17:13:58 -07001203 error = vm_mmap(file,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204 ELF_PAGESTART(eppnt->p_vaddr),
1205 (eppnt->p_filesz +
1206 ELF_PAGEOFFSET(eppnt->p_vaddr)),
1207 PROT_READ | PROT_WRITE | PROT_EXEC,
1208 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
1209 (eppnt->p_offset -
1210 ELF_PAGEOFFSET(eppnt->p_vaddr)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 if (error != ELF_PAGESTART(eppnt->p_vaddr))
1212 goto out_free_ph;
1213
1214 elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
1215 if (padzero(elf_bss)) {
1216 error = -EFAULT;
1217 goto out_free_ph;
1218 }
1219
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001220 len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr +
1221 ELF_MIN_ALIGN - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 bss = eppnt->p_memsz + eppnt->p_vaddr;
Michal Hockoecc2bc82016-05-23 16:25:39 -07001223 if (bss > len) {
1224 error = vm_brk(len, bss - len);
Linus Torvalds5d22fc22016-05-27 15:57:31 -07001225 if (error)
Michal Hockoecc2bc82016-05-23 16:25:39 -07001226 goto out_free_ph;
1227 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 error = 0;
1229
1230out_free_ph:
1231 kfree(elf_phdata);
1232out:
1233 return error;
1234}
Josh Triplett69369a72014-04-03 14:48:27 -07001235#endif /* #ifdef CONFIG_USELIB */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236
Christoph Hellwig698ba7b2009-12-15 16:47:37 -08001237#ifdef CONFIG_ELF_CORE
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238/*
1239 * ELF core dumper
1240 *
1241 * Modelled on fs/exec.c:aout_core_dump()
1242 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1243 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244
1245/*
Jason Baron909af762012-03-23 15:02:51 -07001246 * The purpose of always_dump_vma() is to make sure that special kernel mappings
1247 * that are useful for post-mortem analysis are included in every core dump.
1248 * In that way we ensure that the core dump is fully interpretable later
1249 * without matching up the same kernel and hardware config to see what PC values
1250 * meant. These special mappings include - vDSO, vsyscall, and other
1251 * architecture specific mappings
1252 */
1253static bool always_dump_vma(struct vm_area_struct *vma)
1254{
1255 /* Any vsyscall mappings? */
1256 if (vma == get_gate_vma(vma->vm_mm))
1257 return true;
Andy Lutomirski78d683e2014-05-19 15:58:32 -07001258
1259 /*
1260 * Assume that all vmas with a .name op should always be dumped.
1261 * If this changes, a new vm_ops field can easily be added.
1262 */
1263 if (vma->vm_ops && vma->vm_ops->name && vma->vm_ops->name(vma))
1264 return true;
1265
Jason Baron909af762012-03-23 15:02:51 -07001266 /*
1267 * arch_vma_name() returns non-NULL for special architecture mappings,
1268 * such as vDSO sections.
1269 */
1270 if (arch_vma_name(vma))
1271 return true;
1272
1273 return false;
1274}
1275
1276/*
Roland McGrath82df3972007-10-16 23:27:02 -07001277 * Decide what to dump of a segment, part, all or none.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 */
Roland McGrath82df3972007-10-16 23:27:02 -07001279static unsigned long vma_dump_size(struct vm_area_struct *vma,
1280 unsigned long mm_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281{
KOSAKI Motohiroe575f112008-10-18 20:27:08 -07001282#define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type))
1283
Jason Baron909af762012-03-23 15:02:51 -07001284 /* always dump the vdso and vsyscall sections */
1285 if (always_dump_vma(vma))
Roland McGrath82df3972007-10-16 23:27:02 -07001286 goto whole;
Roland McGrathe5b97dd2007-01-26 00:56:48 -08001287
Konstantin Khlebnikov0103bd12012-10-08 16:28:59 -07001288 if (vma->vm_flags & VM_DONTDUMP)
Jason Baronaccb61f2012-03-23 15:02:51 -07001289 return 0;
1290
Ross Zwisler50378352015-10-05 16:33:36 -06001291 /* support for DAX */
1292 if (vma_is_dax(vma)) {
1293 if ((vma->vm_flags & VM_SHARED) && FILTER(DAX_SHARED))
1294 goto whole;
1295 if (!(vma->vm_flags & VM_SHARED) && FILTER(DAX_PRIVATE))
1296 goto whole;
1297 return 0;
1298 }
1299
KOSAKI Motohiroe575f112008-10-18 20:27:08 -07001300 /* Hugetlb memory check */
1301 if (vma->vm_flags & VM_HUGETLB) {
1302 if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED))
1303 goto whole;
1304 if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE))
1305 goto whole;
Naoya Horiguchi23d9e482013-04-17 15:58:28 -07001306 return 0;
KOSAKI Motohiroe575f112008-10-18 20:27:08 -07001307 }
1308
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 /* Do not dump I/O mapped devices or special mappings */
Konstantin Khlebnikov314e51b2012-10-08 16:29:02 -07001310 if (vma->vm_flags & VM_IO)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 return 0;
1312
Kawai, Hidehiroa1b59e82007-07-19 01:48:29 -07001313 /* By default, dump shared memory if mapped from an anonymous file. */
1314 if (vma->vm_flags & VM_SHARED) {
Al Viro496ad9a2013-01-23 17:07:38 -05001315 if (file_inode(vma->vm_file)->i_nlink == 0 ?
Roland McGrath82df3972007-10-16 23:27:02 -07001316 FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED))
1317 goto whole;
1318 return 0;
Kawai, Hidehiroa1b59e82007-07-19 01:48:29 -07001319 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320
Roland McGrath82df3972007-10-16 23:27:02 -07001321 /* Dump segments that have been written to. */
1322 if (vma->anon_vma && FILTER(ANON_PRIVATE))
1323 goto whole;
1324 if (vma->vm_file == NULL)
1325 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326
Roland McGrath82df3972007-10-16 23:27:02 -07001327 if (FILTER(MAPPED_PRIVATE))
1328 goto whole;
1329
1330 /*
1331 * If this looks like the beginning of a DSO or executable mapping,
1332 * check for an ELF header. If we find one, dump the first page to
1333 * aid in determining what was mapped here.
1334 */
Roland McGrath92dc07b2009-02-06 17:34:07 -08001335 if (FILTER(ELF_HEADERS) &&
1336 vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) {
Roland McGrath82df3972007-10-16 23:27:02 -07001337 u32 __user *header = (u32 __user *) vma->vm_start;
1338 u32 word;
Roland McGrath92dc07b2009-02-06 17:34:07 -08001339 mm_segment_t fs = get_fs();
Roland McGrath82df3972007-10-16 23:27:02 -07001340 /*
1341 * Doing it this way gets the constant folded by GCC.
1342 */
1343 union {
1344 u32 cmp;
1345 char elfmag[SELFMAG];
1346 } magic;
1347 BUILD_BUG_ON(SELFMAG != sizeof word);
1348 magic.elfmag[EI_MAG0] = ELFMAG0;
1349 magic.elfmag[EI_MAG1] = ELFMAG1;
1350 magic.elfmag[EI_MAG2] = ELFMAG2;
1351 magic.elfmag[EI_MAG3] = ELFMAG3;
Roland McGrath92dc07b2009-02-06 17:34:07 -08001352 /*
1353 * Switch to the user "segment" for get_user(),
1354 * then put back what elf_core_dump() had in place.
1355 */
1356 set_fs(USER_DS);
1357 if (unlikely(get_user(word, header)))
1358 word = 0;
1359 set_fs(fs);
1360 if (word == magic.cmp)
Roland McGrath82df3972007-10-16 23:27:02 -07001361 return PAGE_SIZE;
1362 }
1363
1364#undef FILTER
1365
1366 return 0;
1367
1368whole:
1369 return vma->vm_end - vma->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370}
1371
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372/* An ELF note in memory */
1373struct memelfnote
1374{
1375 const char *name;
1376 int type;
1377 unsigned int datasz;
1378 void *data;
1379};
1380
1381static int notesize(struct memelfnote *en)
1382{
1383 int sz;
1384
1385 sz = sizeof(struct elf_note);
1386 sz += roundup(strlen(en->name) + 1, 4);
1387 sz += roundup(en->datasz, 4);
1388
1389 return sz;
1390}
1391
Al Viroecc8c772013-10-05 15:32:35 -04001392static int writenote(struct memelfnote *men, struct coredump_params *cprm)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393{
1394 struct elf_note en;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 en.n_namesz = strlen(men->name) + 1;
1396 en.n_descsz = men->datasz;
1397 en.n_type = men->type;
1398
Al Viroecc8c772013-10-05 15:32:35 -04001399 return dump_emit(cprm, &en, sizeof(en)) &&
Al Viro22a8cb82013-10-08 11:05:01 -04001400 dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&
1401 dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403
Roland McGrath3aba4812008-01-30 13:31:44 +01001404static void fill_elf_header(struct elfhdr *elf, int segs,
Zhang Yanfeid3330cf2013-02-21 16:44:20 -08001405 u16 machine, u32 flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406{
Cyrill Gorcunov6970c8e2008-04-29 01:01:18 -07001407 memset(elf, 0, sizeof(*elf));
1408
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1410 elf->e_ident[EI_CLASS] = ELF_CLASS;
1411 elf->e_ident[EI_DATA] = ELF_DATA;
1412 elf->e_ident[EI_VERSION] = EV_CURRENT;
1413 elf->e_ident[EI_OSABI] = ELF_OSABI;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414
1415 elf->e_type = ET_CORE;
Roland McGrath3aba4812008-01-30 13:31:44 +01001416 elf->e_machine = machine;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 elf->e_version = EV_CURRENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 elf->e_phoff = sizeof(struct elfhdr);
Roland McGrath3aba4812008-01-30 13:31:44 +01001419 elf->e_flags = flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 elf->e_ehsize = sizeof(struct elfhdr);
1421 elf->e_phentsize = sizeof(struct elf_phdr);
1422 elf->e_phnum = segs;
Cyrill Gorcunov6970c8e2008-04-29 01:01:18 -07001423
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 return;
1425}
1426
Andrew Morton8d6b5eee2006-09-25 23:32:04 -07001427static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428{
1429 phdr->p_type = PT_NOTE;
1430 phdr->p_offset = offset;
1431 phdr->p_vaddr = 0;
1432 phdr->p_paddr = 0;
1433 phdr->p_filesz = sz;
1434 phdr->p_memsz = 0;
1435 phdr->p_flags = 0;
1436 phdr->p_align = 0;
1437 return;
1438}
1439
1440static void fill_note(struct memelfnote *note, const char *name, int type,
1441 unsigned int sz, void *data)
1442{
1443 note->name = name;
1444 note->type = type;
1445 note->datasz = sz;
1446 note->data = data;
1447 return;
1448}
1449
1450/*
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001451 * fill up all the fields in prstatus from the given task struct, except
1452 * registers which need to be filled up separately.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 */
1454static void fill_prstatus(struct elf_prstatus *prstatus,
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001455 struct task_struct *p, long signr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456{
1457 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1458 prstatus->pr_sigpend = p->pending.signal.sig[0];
1459 prstatus->pr_sighold = p->blocked.sig[0];
Oleg Nesterov3b34fc52009-06-17 16:27:38 -07001460 rcu_read_lock();
1461 prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1462 rcu_read_unlock();
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001463 prstatus->pr_pid = task_pid_vnr(p);
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001464 prstatus->pr_pgrp = task_pgrp_vnr(p);
1465 prstatus->pr_sid = task_session_vnr(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466 if (thread_group_leader(p)) {
Frank Mayharf06febc2008-09-12 09:54:39 -07001467 struct task_cputime cputime;
1468
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469 /*
Frank Mayharf06febc2008-09-12 09:54:39 -07001470 * This is the record for the group leader. It shows the
1471 * group-wide total, not its individual thread total.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472 */
Frank Mayharf06febc2008-09-12 09:54:39 -07001473 thread_group_cputime(p, &cputime);
1474 cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
1475 cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 } else {
Frederic Weisbecker6fac4822012-11-13 14:20:55 +01001477 cputime_t utime, stime;
1478
1479 task_cputime(p, &utime, &stime);
1480 cputime_to_timeval(utime, &prstatus->pr_utime);
1481 cputime_to_timeval(stime, &prstatus->pr_stime);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 }
1483 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1484 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1485}
1486
1487static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1488 struct mm_struct *mm)
1489{
David Howellsc69e8d92008-11-14 10:39:19 +11001490 const struct cred *cred;
Greg Kroah-Hartmana84a5052005-05-11 00:10:44 -07001491 unsigned int i, len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492
1493 /* first copy the parameters from user space */
1494 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1495
1496 len = mm->arg_end - mm->arg_start;
1497 if (len >= ELF_PRARGSZ)
1498 len = ELF_PRARGSZ-1;
1499 if (copy_from_user(&psinfo->pr_psargs,
1500 (const char __user *)mm->arg_start, len))
1501 return -EFAULT;
1502 for(i = 0; i < len; i++)
1503 if (psinfo->pr_psargs[i] == 0)
1504 psinfo->pr_psargs[i] = ' ';
1505 psinfo->pr_psargs[len] = 0;
1506
Oleg Nesterov3b34fc52009-06-17 16:27:38 -07001507 rcu_read_lock();
1508 psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1509 rcu_read_unlock();
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001510 psinfo->pr_pid = task_pid_vnr(p);
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001511 psinfo->pr_pgrp = task_pgrp_vnr(p);
1512 psinfo->pr_sid = task_session_vnr(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513
1514 i = p->state ? ffz(~p->state) + 1 : 0;
1515 psinfo->pr_state = i;
Carsten Otte55148542006-03-25 03:08:22 -08001516 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1518 psinfo->pr_nice = task_nice(p);
1519 psinfo->pr_flag = p->flags;
David Howellsc69e8d92008-11-14 10:39:19 +11001520 rcu_read_lock();
1521 cred = __task_cred(p);
Eric W. Biedermanebc887b2012-02-07 18:36:10 -08001522 SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
1523 SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
David Howellsc69e8d92008-11-14 10:39:19 +11001524 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1526
1527 return 0;
1528}
1529
Roland McGrath3aba4812008-01-30 13:31:44 +01001530static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm)
1531{
1532 elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv;
1533 int i = 0;
1534 do
1535 i += 2;
1536 while (auxv[i - 2] != AT_NULL);
1537 fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);
1538}
1539
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001540static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata,
Al Viroce395962013-10-13 17:23:53 -04001541 const siginfo_t *siginfo)
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001542{
1543 mm_segment_t old_fs = get_fs();
1544 set_fs(KERNEL_DS);
1545 copy_siginfo_to_user((user_siginfo_t __user *) csigdata, siginfo);
1546 set_fs(old_fs);
1547 fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata);
1548}
1549
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001550#define MAX_FILE_NOTE_SIZE (4*1024*1024)
1551/*
1552 * Format of NT_FILE note:
1553 *
1554 * long count -- how many files are mapped
1555 * long page_size -- units for file_ofs
1556 * array of [COUNT] elements of
1557 * long start
1558 * long end
1559 * long file_ofs
1560 * followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL...
1561 */
Dan Aloni72023652013-09-30 13:45:02 -07001562static int fill_files_note(struct memelfnote *note)
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001563{
1564 struct vm_area_struct *vma;
1565 unsigned count, size, names_ofs, remaining, n;
1566 user_long_t *data;
1567 user_long_t *start_end_ofs;
1568 char *name_base, *name_curpos;
1569
1570 /* *Estimated* file count and total data size needed */
1571 count = current->mm->map_count;
1572 size = count * 64;
1573
1574 names_ofs = (2 + 3 * count) * sizeof(data[0]);
1575 alloc:
1576 if (size >= MAX_FILE_NOTE_SIZE) /* paranoia check */
Dan Aloni72023652013-09-30 13:45:02 -07001577 return -EINVAL;
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001578 size = round_up(size, PAGE_SIZE);
1579 data = vmalloc(size);
1580 if (!data)
Dan Aloni72023652013-09-30 13:45:02 -07001581 return -ENOMEM;
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001582
1583 start_end_ofs = data + 2;
1584 name_base = name_curpos = ((char *)data) + names_ofs;
1585 remaining = size - names_ofs;
1586 count = 0;
1587 for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
1588 struct file *file;
1589 const char *filename;
1590
1591 file = vma->vm_file;
1592 if (!file)
1593 continue;
Miklos Szeredi9bf39ab2015-06-19 10:29:13 +02001594 filename = file_path(file, name_curpos, remaining);
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001595 if (IS_ERR(filename)) {
1596 if (PTR_ERR(filename) == -ENAMETOOLONG) {
1597 vfree(data);
1598 size = size * 5 / 4;
1599 goto alloc;
1600 }
1601 continue;
1602 }
1603
Miklos Szeredi9bf39ab2015-06-19 10:29:13 +02001604 /* file_path() fills at the end, move name down */
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001605 /* n = strlen(filename) + 1: */
1606 n = (name_curpos + remaining) - filename;
1607 remaining = filename - name_curpos;
1608 memmove(name_curpos, filename, n);
1609 name_curpos += n;
1610
1611 *start_end_ofs++ = vma->vm_start;
1612 *start_end_ofs++ = vma->vm_end;
1613 *start_end_ofs++ = vma->vm_pgoff;
1614 count++;
1615 }
1616
1617 /* Now we know exact count of files, can store it */
1618 data[0] = count;
1619 data[1] = PAGE_SIZE;
1620 /*
1621 * Count usually is less than current->mm->map_count,
1622 * we need to move filenames down.
1623 */
1624 n = current->mm->map_count - count;
1625 if (n != 0) {
1626 unsigned shift_bytes = n * 3 * sizeof(data[0]);
1627 memmove(name_base - shift_bytes, name_base,
1628 name_curpos - name_base);
1629 name_curpos -= shift_bytes;
1630 }
1631
1632 size = name_curpos - (char *)data;
1633 fill_note(note, "CORE", NT_FILE, size, data);
Dan Aloni72023652013-09-30 13:45:02 -07001634 return 0;
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001635}
1636
Roland McGrath4206d3a2008-01-30 13:31:45 +01001637#ifdef CORE_DUMP_USE_REGSET
1638#include <linux/regset.h>
1639
1640struct elf_thread_core_info {
1641 struct elf_thread_core_info *next;
1642 struct task_struct *task;
1643 struct elf_prstatus prstatus;
1644 struct memelfnote notes[0];
1645};
1646
1647struct elf_note_info {
1648 struct elf_thread_core_info *thread;
1649 struct memelfnote psinfo;
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001650 struct memelfnote signote;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001651 struct memelfnote auxv;
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001652 struct memelfnote files;
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001653 user_siginfo_t csigdata;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001654 size_t size;
1655 int thread_notes;
1656};
1657
Roland McGrathd31472b2008-03-04 14:28:30 -08001658/*
1659 * When a regset has a writeback hook, we call it on each thread before
1660 * dumping user memory. On register window machines, this makes sure the
1661 * user memory backing the register data is up to date before we read it.
1662 */
1663static void do_thread_regset_writeback(struct task_struct *task,
1664 const struct user_regset *regset)
1665{
1666 if (regset->writeback)
1667 regset->writeback(task, regset, 1);
1668}
1669
H. J. Lu0953f65d2012-02-14 13:34:52 -08001670#ifndef PRSTATUS_SIZE
Dmitry Safonov90954e72016-09-05 16:33:06 +03001671#define PRSTATUS_SIZE(S, R) sizeof(S)
H. J. Lu0953f65d2012-02-14 13:34:52 -08001672#endif
1673
1674#ifndef SET_PR_FPVALID
Dmitry Safonov90954e72016-09-05 16:33:06 +03001675#define SET_PR_FPVALID(S, V, R) ((S)->pr_fpvalid = (V))
H. J. Lu0953f65d2012-02-14 13:34:52 -08001676#endif
1677
Roland McGrath4206d3a2008-01-30 13:31:45 +01001678static int fill_thread_core_info(struct elf_thread_core_info *t,
1679 const struct user_regset_view *view,
1680 long signr, size_t *total)
1681{
1682 unsigned int i;
Dmitry Safonov90954e72016-09-05 16:33:06 +03001683 unsigned int regset_size = view->regsets[0].n * view->regsets[0].size;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001684
1685 /*
1686 * NT_PRSTATUS is the one special case, because the regset data
1687 * goes into the pr_reg field inside the note contents, rather
1688 * than being the whole note contents. We fill the reset in here.
1689 * We assume that regset 0 is NT_PRSTATUS.
1690 */
1691 fill_prstatus(&t->prstatus, t->task, signr);
Dmitry Safonov90954e72016-09-05 16:33:06 +03001692 (void) view->regsets[0].get(t->task, &view->regsets[0], 0, regset_size,
1693 &t->prstatus.pr_reg, NULL);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001694
1695 fill_note(&t->notes[0], "CORE", NT_PRSTATUS,
Dmitry Safonov90954e72016-09-05 16:33:06 +03001696 PRSTATUS_SIZE(t->prstatus, regset_size), &t->prstatus);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001697 *total += notesize(&t->notes[0]);
1698
Roland McGrathd31472b2008-03-04 14:28:30 -08001699 do_thread_regset_writeback(t->task, &view->regsets[0]);
1700
Roland McGrath4206d3a2008-01-30 13:31:45 +01001701 /*
1702 * Each other regset might generate a note too. For each regset
1703 * that has no core_note_type or is inactive, we leave t->notes[i]
1704 * all zero and we'll know to skip writing it later.
1705 */
1706 for (i = 1; i < view->n; ++i) {
1707 const struct user_regset *regset = &view->regsets[i];
Roland McGrathd31472b2008-03-04 14:28:30 -08001708 do_thread_regset_writeback(t->task, regset);
H. Peter Anvinc8e25252012-03-02 10:43:48 -08001709 if (regset->core_note_type && regset->get &&
Roland McGrath4206d3a2008-01-30 13:31:45 +01001710 (!regset->active || regset->active(t->task, regset))) {
1711 int ret;
1712 size_t size = regset->n * regset->size;
1713 void *data = kmalloc(size, GFP_KERNEL);
1714 if (unlikely(!data))
1715 return 0;
1716 ret = regset->get(t->task, regset,
1717 0, size, data, NULL);
1718 if (unlikely(ret))
1719 kfree(data);
1720 else {
1721 if (regset->core_note_type != NT_PRFPREG)
1722 fill_note(&t->notes[i], "LINUX",
1723 regset->core_note_type,
1724 size, data);
1725 else {
Dmitry Safonov90954e72016-09-05 16:33:06 +03001726 SET_PR_FPVALID(&t->prstatus,
1727 1, regset_size);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001728 fill_note(&t->notes[i], "CORE",
1729 NT_PRFPREG, size, data);
1730 }
1731 *total += notesize(&t->notes[i]);
1732 }
1733 }
1734 }
1735
1736 return 1;
1737}
1738
1739static int fill_note_info(struct elfhdr *elf, int phdrs,
1740 struct elf_note_info *info,
Al Viroec579412013-10-13 17:57:29 -04001741 const siginfo_t *siginfo, struct pt_regs *regs)
Roland McGrath4206d3a2008-01-30 13:31:45 +01001742{
1743 struct task_struct *dump_task = current;
1744 const struct user_regset_view *view = task_user_regset_view(dump_task);
1745 struct elf_thread_core_info *t;
1746 struct elf_prpsinfo *psinfo;
Oleg Nesterov83914442008-07-25 01:47:45 -07001747 struct core_thread *ct;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001748 unsigned int i;
1749
1750 info->size = 0;
1751 info->thread = NULL;
1752
1753 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
Alan Cox6899e922012-12-17 16:02:09 -08001754 if (psinfo == NULL) {
1755 info->psinfo.data = NULL; /* So we don't free this wrongly */
Roland McGrath4206d3a2008-01-30 13:31:45 +01001756 return 0;
Alan Cox6899e922012-12-17 16:02:09 -08001757 }
Roland McGrath4206d3a2008-01-30 13:31:45 +01001758
Amerigo Wange2dbe122009-07-01 01:06:26 -04001759 fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1760
Roland McGrath4206d3a2008-01-30 13:31:45 +01001761 /*
1762 * Figure out how many notes we're going to need for each thread.
1763 */
1764 info->thread_notes = 0;
1765 for (i = 0; i < view->n; ++i)
1766 if (view->regsets[i].core_note_type != 0)
1767 ++info->thread_notes;
1768
1769 /*
1770 * Sanity check. We rely on regset 0 being in NT_PRSTATUS,
1771 * since it is our one special case.
1772 */
1773 if (unlikely(info->thread_notes == 0) ||
1774 unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) {
1775 WARN_ON(1);
1776 return 0;
1777 }
1778
1779 /*
1780 * Initialize the ELF file header.
1781 */
1782 fill_elf_header(elf, phdrs,
Zhang Yanfeid3330cf2013-02-21 16:44:20 -08001783 view->e_machine, view->e_flags);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001784
1785 /*
1786 * Allocate a structure for each thread.
1787 */
Oleg Nesterov83914442008-07-25 01:47:45 -07001788 for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) {
1789 t = kzalloc(offsetof(struct elf_thread_core_info,
1790 notes[info->thread_notes]),
1791 GFP_KERNEL);
1792 if (unlikely(!t))
1793 return 0;
Oleg Nesterov24d52882008-07-25 01:47:40 -07001794
Oleg Nesterov83914442008-07-25 01:47:45 -07001795 t->task = ct->task;
1796 if (ct->task == dump_task || !info->thread) {
1797 t->next = info->thread;
1798 info->thread = t;
1799 } else {
1800 /*
1801 * Make sure to keep the original task at
1802 * the head of the list.
1803 */
1804 t->next = info->thread->next;
1805 info->thread->next = t;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001806 }
Oleg Nesterov83914442008-07-25 01:47:45 -07001807 }
Roland McGrath4206d3a2008-01-30 13:31:45 +01001808
1809 /*
1810 * Now fill in each thread's information.
1811 */
1812 for (t = info->thread; t != NULL; t = t->next)
Denys Vlasenko5ab1c302012-10-04 17:15:29 -07001813 if (!fill_thread_core_info(t, view, siginfo->si_signo, &info->size))
Roland McGrath4206d3a2008-01-30 13:31:45 +01001814 return 0;
1815
1816 /*
1817 * Fill in the two process-wide notes.
1818 */
1819 fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm);
1820 info->size += notesize(&info->psinfo);
1821
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001822 fill_siginfo_note(&info->signote, &info->csigdata, siginfo);
1823 info->size += notesize(&info->signote);
1824
Roland McGrath4206d3a2008-01-30 13:31:45 +01001825 fill_auxv_note(&info->auxv, current->mm);
1826 info->size += notesize(&info->auxv);
1827
Dan Aloni72023652013-09-30 13:45:02 -07001828 if (fill_files_note(&info->files) == 0)
1829 info->size += notesize(&info->files);
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001830
Roland McGrath4206d3a2008-01-30 13:31:45 +01001831 return 1;
1832}
1833
1834static size_t get_note_info_size(struct elf_note_info *info)
1835{
1836 return info->size;
1837}
1838
1839/*
1840 * Write all the notes for each thread. When writing the first thread, the
1841 * process-wide notes are interleaved after the first thread-specific note.
1842 */
1843static int write_note_info(struct elf_note_info *info,
Al Viroecc8c772013-10-05 15:32:35 -04001844 struct coredump_params *cprm)
Roland McGrath4206d3a2008-01-30 13:31:45 +01001845{
Fabian Frederickb219e252014-06-04 16:12:14 -07001846 bool first = true;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001847 struct elf_thread_core_info *t = info->thread;
1848
1849 do {
1850 int i;
1851
Al Viroecc8c772013-10-05 15:32:35 -04001852 if (!writenote(&t->notes[0], cprm))
Roland McGrath4206d3a2008-01-30 13:31:45 +01001853 return 0;
1854
Al Viroecc8c772013-10-05 15:32:35 -04001855 if (first && !writenote(&info->psinfo, cprm))
Roland McGrath4206d3a2008-01-30 13:31:45 +01001856 return 0;
Al Viroecc8c772013-10-05 15:32:35 -04001857 if (first && !writenote(&info->signote, cprm))
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001858 return 0;
Al Viroecc8c772013-10-05 15:32:35 -04001859 if (first && !writenote(&info->auxv, cprm))
Roland McGrath4206d3a2008-01-30 13:31:45 +01001860 return 0;
Dan Aloni72023652013-09-30 13:45:02 -07001861 if (first && info->files.data &&
Al Viroecc8c772013-10-05 15:32:35 -04001862 !writenote(&info->files, cprm))
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001863 return 0;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001864
1865 for (i = 1; i < info->thread_notes; ++i)
1866 if (t->notes[i].data &&
Al Viroecc8c772013-10-05 15:32:35 -04001867 !writenote(&t->notes[i], cprm))
Roland McGrath4206d3a2008-01-30 13:31:45 +01001868 return 0;
1869
Fabian Frederickb219e252014-06-04 16:12:14 -07001870 first = false;
Roland McGrath4206d3a2008-01-30 13:31:45 +01001871 t = t->next;
1872 } while (t);
1873
1874 return 1;
1875}
1876
1877static void free_note_info(struct elf_note_info *info)
1878{
1879 struct elf_thread_core_info *threads = info->thread;
1880 while (threads) {
1881 unsigned int i;
1882 struct elf_thread_core_info *t = threads;
1883 threads = t->next;
1884 WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus);
1885 for (i = 1; i < info->thread_notes; ++i)
1886 kfree(t->notes[i].data);
1887 kfree(t);
1888 }
1889 kfree(info->psinfo.data);
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001890 vfree(info->files.data);
Roland McGrath4206d3a2008-01-30 13:31:45 +01001891}
1892
1893#else
1894
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895/* Here is the structure in which status of each thread is captured. */
1896struct elf_thread_status
1897{
1898 struct list_head list;
1899 struct elf_prstatus prstatus; /* NT_PRSTATUS */
1900 elf_fpregset_t fpu; /* NT_PRFPREG */
1901 struct task_struct *thread;
1902#ifdef ELF_CORE_COPY_XFPREGS
Mark Nelson5b20cd82007-10-16 23:25:39 -07001903 elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904#endif
1905 struct memelfnote notes[3];
1906 int num_notes;
1907};
1908
1909/*
1910 * In order to add the specific thread information for the elf file format,
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001911 * we need to keep a linked list of every threads pr_status and then create
1912 * a single section for them in the final core file.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913 */
1914static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1915{
1916 int sz = 0;
1917 struct task_struct *p = t->thread;
1918 t->num_notes = 0;
1919
1920 fill_prstatus(&t->prstatus, p, signr);
1921 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1922
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001923 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1924 &(t->prstatus));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925 t->num_notes++;
1926 sz += notesize(&t->notes[0]);
1927
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07001928 if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL,
1929 &t->fpu))) {
1930 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1931 &(t->fpu));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932 t->num_notes++;
1933 sz += notesize(&t->notes[1]);
1934 }
1935
1936#ifdef ELF_CORE_COPY_XFPREGS
1937 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
Mark Nelson5b20cd82007-10-16 23:25:39 -07001938 fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
1939 sizeof(t->xfpu), &t->xfpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940 t->num_notes++;
1941 sz += notesize(&t->notes[2]);
1942 }
1943#endif
1944 return sz;
1945}
1946
Roland McGrath3aba4812008-01-30 13:31:44 +01001947struct elf_note_info {
1948 struct memelfnote *notes;
Dan Aloni72023652013-09-30 13:45:02 -07001949 struct memelfnote *notes_files;
Roland McGrath3aba4812008-01-30 13:31:44 +01001950 struct elf_prstatus *prstatus; /* NT_PRSTATUS */
1951 struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */
1952 struct list_head thread_list;
1953 elf_fpregset_t *fpu;
1954#ifdef ELF_CORE_COPY_XFPREGS
1955 elf_fpxregset_t *xfpu;
1956#endif
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001957 user_siginfo_t csigdata;
Roland McGrath3aba4812008-01-30 13:31:44 +01001958 int thread_status_size;
1959 int numnote;
1960};
1961
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001962static int elf_note_info_init(struct elf_note_info *info)
Roland McGrath3aba4812008-01-30 13:31:44 +01001963{
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001964 memset(info, 0, sizeof(*info));
Roland McGrath3aba4812008-01-30 13:31:44 +01001965 INIT_LIST_HEAD(&info->thread_list);
1966
Denys Vlasenko49ae4d42012-10-04 17:15:35 -07001967 /* Allocate space for ELF notes */
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07001968 info->notes = kmalloc(8 * sizeof(struct memelfnote), GFP_KERNEL);
Roland McGrath3aba4812008-01-30 13:31:44 +01001969 if (!info->notes)
1970 return 0;
1971 info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
1972 if (!info->psinfo)
Denys Vlasenkof34f9d12012-09-26 11:34:50 +10001973 return 0;
Roland McGrath3aba4812008-01-30 13:31:44 +01001974 info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL);
1975 if (!info->prstatus)
Denys Vlasenkof34f9d12012-09-26 11:34:50 +10001976 return 0;
Roland McGrath3aba4812008-01-30 13:31:44 +01001977 info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
1978 if (!info->fpu)
Denys Vlasenkof34f9d12012-09-26 11:34:50 +10001979 return 0;
Roland McGrath3aba4812008-01-30 13:31:44 +01001980#ifdef ELF_CORE_COPY_XFPREGS
1981 info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL);
1982 if (!info->xfpu)
Denys Vlasenkof34f9d12012-09-26 11:34:50 +10001983 return 0;
Roland McGrath3aba4812008-01-30 13:31:44 +01001984#endif
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001985 return 1;
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001986}
Roland McGrath3aba4812008-01-30 13:31:44 +01001987
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001988static int fill_note_info(struct elfhdr *elf, int phdrs,
1989 struct elf_note_info *info,
Al Viroec579412013-10-13 17:57:29 -04001990 const siginfo_t *siginfo, struct pt_regs *regs)
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001991{
1992 struct list_head *t;
Al Viroafabada2013-10-14 07:39:56 -04001993 struct core_thread *ct;
1994 struct elf_thread_status *ets;
Amerigo Wang0cf062d2009-09-23 15:57:05 -07001995
1996 if (!elf_note_info_init(info))
1997 return 0;
1998
Al Viroafabada2013-10-14 07:39:56 -04001999 for (ct = current->mm->core_state->dumper.next;
2000 ct; ct = ct->next) {
2001 ets = kzalloc(sizeof(*ets), GFP_KERNEL);
2002 if (!ets)
2003 return 0;
Oleg Nesterov24d52882008-07-25 01:47:40 -07002004
Al Viroafabada2013-10-14 07:39:56 -04002005 ets->thread = ct->task;
2006 list_add(&ets->list, &info->thread_list);
2007 }
Oleg Nesterov83914442008-07-25 01:47:45 -07002008
Al Viroafabada2013-10-14 07:39:56 -04002009 list_for_each(t, &info->thread_list) {
2010 int sz;
Oleg Nesterov83914442008-07-25 01:47:45 -07002011
Al Viroafabada2013-10-14 07:39:56 -04002012 ets = list_entry(t, struct elf_thread_status, list);
2013 sz = elf_dump_thread_status(siginfo->si_signo, ets);
2014 info->thread_status_size += sz;
Roland McGrath3aba4812008-01-30 13:31:44 +01002015 }
2016 /* now collect the dump for the current */
2017 memset(info->prstatus, 0, sizeof(*info->prstatus));
Denys Vlasenko5ab1c302012-10-04 17:15:29 -07002018 fill_prstatus(info->prstatus, current, siginfo->si_signo);
Roland McGrath3aba4812008-01-30 13:31:44 +01002019 elf_core_copy_regs(&info->prstatus->pr_reg, regs);
2020
2021 /* Set up header */
Zhang Yanfeid3330cf2013-02-21 16:44:20 -08002022 fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS);
Roland McGrath3aba4812008-01-30 13:31:44 +01002023
2024 /*
2025 * Set up the notes in similar form to SVR4 core dumps made
2026 * with info from their /proc.
2027 */
2028
2029 fill_note(info->notes + 0, "CORE", NT_PRSTATUS,
2030 sizeof(*info->prstatus), info->prstatus);
2031 fill_psinfo(info->psinfo, current->group_leader, current->mm);
2032 fill_note(info->notes + 1, "CORE", NT_PRPSINFO,
2033 sizeof(*info->psinfo), info->psinfo);
2034
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07002035 fill_siginfo_note(info->notes + 2, &info->csigdata, siginfo);
2036 fill_auxv_note(info->notes + 3, current->mm);
Dan Aloni72023652013-09-30 13:45:02 -07002037 info->numnote = 4;
Roland McGrath3aba4812008-01-30 13:31:44 +01002038
Dan Aloni72023652013-09-30 13:45:02 -07002039 if (fill_files_note(info->notes + info->numnote) == 0) {
2040 info->notes_files = info->notes + info->numnote;
2041 info->numnote++;
2042 }
Roland McGrath3aba4812008-01-30 13:31:44 +01002043
2044 /* Try to dump the FPU. */
2045 info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs,
2046 info->fpu);
2047 if (info->prstatus->pr_fpvalid)
2048 fill_note(info->notes + info->numnote++,
2049 "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu);
2050#ifdef ELF_CORE_COPY_XFPREGS
2051 if (elf_core_copy_task_xfpregs(current, info->xfpu))
2052 fill_note(info->notes + info->numnote++,
2053 "LINUX", ELF_CORE_XFPREG_TYPE,
2054 sizeof(*info->xfpu), info->xfpu);
2055#endif
2056
2057 return 1;
Roland McGrath3aba4812008-01-30 13:31:44 +01002058}
2059
2060static size_t get_note_info_size(struct elf_note_info *info)
2061{
2062 int sz = 0;
2063 int i;
2064
2065 for (i = 0; i < info->numnote; i++)
2066 sz += notesize(info->notes + i);
2067
2068 sz += info->thread_status_size;
2069
2070 return sz;
2071}
2072
2073static int write_note_info(struct elf_note_info *info,
Al Viroecc8c772013-10-05 15:32:35 -04002074 struct coredump_params *cprm)
Roland McGrath3aba4812008-01-30 13:31:44 +01002075{
2076 int i;
2077 struct list_head *t;
2078
2079 for (i = 0; i < info->numnote; i++)
Al Viroecc8c772013-10-05 15:32:35 -04002080 if (!writenote(info->notes + i, cprm))
Roland McGrath3aba4812008-01-30 13:31:44 +01002081 return 0;
2082
2083 /* write out the thread status notes section */
2084 list_for_each(t, &info->thread_list) {
2085 struct elf_thread_status *tmp =
2086 list_entry(t, struct elf_thread_status, list);
2087
2088 for (i = 0; i < tmp->num_notes; i++)
Al Viroecc8c772013-10-05 15:32:35 -04002089 if (!writenote(&tmp->notes[i], cprm))
Roland McGrath3aba4812008-01-30 13:31:44 +01002090 return 0;
2091 }
2092
2093 return 1;
2094}
2095
2096static void free_note_info(struct elf_note_info *info)
2097{
2098 while (!list_empty(&info->thread_list)) {
2099 struct list_head *tmp = info->thread_list.next;
2100 list_del(tmp);
2101 kfree(list_entry(tmp, struct elf_thread_status, list));
2102 }
2103
Dan Aloni72023652013-09-30 13:45:02 -07002104 /* Free data possibly allocated by fill_files_note(): */
2105 if (info->notes_files)
2106 vfree(info->notes_files->data);
Denys Vlasenko2aa362c2012-10-04 17:15:36 -07002107
Roland McGrath3aba4812008-01-30 13:31:44 +01002108 kfree(info->prstatus);
2109 kfree(info->psinfo);
2110 kfree(info->notes);
2111 kfree(info->fpu);
2112#ifdef ELF_CORE_COPY_XFPREGS
2113 kfree(info->xfpu);
2114#endif
2115}
2116
Roland McGrath4206d3a2008-01-30 13:31:45 +01002117#endif
2118
Roland McGrathf47aef52007-01-26 00:56:49 -08002119static struct vm_area_struct *first_vma(struct task_struct *tsk,
2120 struct vm_area_struct *gate_vma)
2121{
2122 struct vm_area_struct *ret = tsk->mm->mmap;
2123
2124 if (ret)
2125 return ret;
2126 return gate_vma;
2127}
2128/*
2129 * Helper function for iterating across a vma list. It ensures that the caller
2130 * will visit `gate_vma' prior to terminating the search.
2131 */
2132static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
2133 struct vm_area_struct *gate_vma)
2134{
2135 struct vm_area_struct *ret;
2136
2137 ret = this_vma->vm_next;
2138 if (ret)
2139 return ret;
2140 if (this_vma == gate_vma)
2141 return NULL;
2142 return gate_vma;
2143}
2144
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002145static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
2146 elf_addr_t e_shoff, int segs)
2147{
2148 elf->e_shoff = e_shoff;
2149 elf->e_shentsize = sizeof(*shdr4extnum);
2150 elf->e_shnum = 1;
2151 elf->e_shstrndx = SHN_UNDEF;
2152
2153 memset(shdr4extnum, 0, sizeof(*shdr4extnum));
2154
2155 shdr4extnum->sh_type = SHT_NULL;
2156 shdr4extnum->sh_size = elf->e_shnum;
2157 shdr4extnum->sh_link = elf->e_shstrndx;
2158 shdr4extnum->sh_info = segs;
2159}
2160
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161/*
2162 * Actual dumper
2163 *
2164 * This is a two-pass process; first we find the offsets of the bits,
2165 * and then they are actually written out. If we run out of core limit
2166 * we just truncate.
2167 */
Masami Hiramatsuf6151df2009-12-17 15:27:16 -08002168static int elf_core_dump(struct coredump_params *cprm)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002169{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002170 int has_dumped = 0;
2171 mm_segment_t fs;
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002172 int segs, i;
2173 size_t vma_data_size = 0;
Roland McGrathf47aef52007-01-26 00:56:49 -08002174 struct vm_area_struct *vma, *gate_vma;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175 struct elfhdr *elf = NULL;
Al Virocdc3d562013-10-05 22:24:29 -04002176 loff_t offset = 0, dataoff;
Dan Aloni72023652013-09-30 13:45:02 -07002177 struct elf_note_info info = { };
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002178 struct elf_phdr *phdr4note = NULL;
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002179 struct elf_shdr *shdr4extnum = NULL;
2180 Elf_Half e_phnum;
2181 elf_addr_t e_shoff;
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002182 elf_addr_t *vma_filesz = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002183
2184 /*
2185 * We no longer stop all VM operations.
2186 *
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07002187 * This is because those proceses that could possibly change map_count
2188 * or the mmap / vma pages are now blocked in do_exit on current
2189 * finishing this core dump.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002190 *
2191 * Only ptrace can touch these memory addresses, but it doesn't change
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07002192 * the map_count or the pages allocated. So no possibility of crashing
Linus Torvalds1da177e2005-04-16 15:20:36 -07002193 * exists while dumping the mm->vm_next areas to the core file.
2194 */
2195
2196 /* alloc memory for large data structures: too large to be on stack */
2197 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
2198 if (!elf)
WANG Cong5f719552008-05-06 12:45:35 +08002199 goto out;
KAMEZAWA Hiroyuki341c87b2009-06-30 11:41:23 -07002200 /*
2201 * The number of segs are recored into ELF header as 16bit value.
2202 * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here.
2203 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002204 segs = current->mm->map_count;
Daisuke HATAYAMA1fcccba2010-03-05 13:44:07 -08002205 segs += elf_core_extra_phdrs();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002206
Stephen Wilson31db58b2011-03-13 15:49:15 -04002207 gate_vma = get_gate_vma(current->mm);
Roland McGrathf47aef52007-01-26 00:56:49 -08002208 if (gate_vma != NULL)
2209 segs++;
2210
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002211 /* for notes section */
2212 segs++;
2213
2214 /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
2215 * this, kernel supports extended numbering. Have a look at
2216 * include/linux/elf.h for further information. */
2217 e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
2218
Roland McGrath3aba4812008-01-30 13:31:44 +01002219 /*
2220 * Collect all the non-memory information about the process for the
2221 * notes. This also sets up the file header.
2222 */
Denys Vlasenko5ab1c302012-10-04 17:15:29 -07002223 if (!fill_note_info(elf, e_phnum, &info, cprm->siginfo, cprm->regs))
Roland McGrath3aba4812008-01-30 13:31:44 +01002224 goto cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002225
2226 has_dumped = 1;
Oleg Nesterov079148b2013-04-30 15:28:16 -07002227
Linus Torvalds1da177e2005-04-16 15:20:36 -07002228 fs = get_fs();
2229 set_fs(KERNEL_DS);
2230
Linus Torvalds1da177e2005-04-16 15:20:36 -07002231 offset += sizeof(*elf); /* Elf header */
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002232 offset += segs * sizeof(struct elf_phdr); /* Program headers */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002233
2234 /* Write notes phdr entry */
2235 {
Roland McGrath3aba4812008-01-30 13:31:44 +01002236 size_t sz = get_note_info_size(&info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237
Michael Ellermane5501492007-09-19 14:38:12 +10002238 sz += elf_coredump_extra_notes_size();
Dwayne Grant McConnellbf1ab972006-11-23 00:46:37 +01002239
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002240 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
2241 if (!phdr4note)
Daisuke HATAYAMA088e7af2010-03-05 13:44:06 -08002242 goto end_coredump;
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002243
2244 fill_elf_note_phdr(phdr4note, sz, offset);
2245 offset += sz;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002246 }
2247
Linus Torvalds1da177e2005-04-16 15:20:36 -07002248 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
2249
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002250 vma_filesz = kmalloc_array(segs - 1, sizeof(*vma_filesz), GFP_KERNEL);
2251 if (!vma_filesz)
2252 goto end_coredump;
2253
2254 for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
2255 vma = next_vma(vma, gate_vma)) {
2256 unsigned long dump_size;
2257
2258 dump_size = vma_dump_size(vma, cprm->mm_flags);
2259 vma_filesz[i++] = dump_size;
2260 vma_data_size += dump_size;
2261 }
2262
2263 offset += vma_data_size;
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002264 offset += elf_core_extra_data_size();
2265 e_shoff = offset;
2266
2267 if (e_phnum == PN_XNUM) {
2268 shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
2269 if (!shdr4extnum)
2270 goto end_coredump;
2271 fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
2272 }
2273
2274 offset = dataoff;
2275
Al Viroecc8c772013-10-05 15:32:35 -04002276 if (!dump_emit(cprm, elf, sizeof(*elf)))
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002277 goto end_coredump;
2278
Al Viroecc8c772013-10-05 15:32:35 -04002279 if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note)))
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002280 goto end_coredump;
2281
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282 /* Write program headers for segments dump */
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002283 for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
Roland McGrathf47aef52007-01-26 00:56:49 -08002284 vma = next_vma(vma, gate_vma)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002285 struct elf_phdr phdr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002286
2287 phdr.p_type = PT_LOAD;
2288 phdr.p_offset = offset;
2289 phdr.p_vaddr = vma->vm_start;
2290 phdr.p_paddr = 0;
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002291 phdr.p_filesz = vma_filesz[i++];
Roland McGrath82df3972007-10-16 23:27:02 -07002292 phdr.p_memsz = vma->vm_end - vma->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002293 offset += phdr.p_filesz;
2294 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07002295 if (vma->vm_flags & VM_WRITE)
2296 phdr.p_flags |= PF_W;
2297 if (vma->vm_flags & VM_EXEC)
2298 phdr.p_flags |= PF_X;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002299 phdr.p_align = ELF_EXEC_PAGESIZE;
2300
Al Viroecc8c772013-10-05 15:32:35 -04002301 if (!dump_emit(cprm, &phdr, sizeof(phdr)))
Daisuke HATAYAMA088e7af2010-03-05 13:44:06 -08002302 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303 }
2304
Al Viro506f21c2013-10-05 17:22:57 -04002305 if (!elf_core_write_extra_phdrs(cprm, offset))
Daisuke HATAYAMA1fcccba2010-03-05 13:44:07 -08002306 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307
2308 /* write out the notes section */
Al Viroecc8c772013-10-05 15:32:35 -04002309 if (!write_note_info(&info, cprm))
Roland McGrath3aba4812008-01-30 13:31:44 +01002310 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002311
Al Virocdc3d562013-10-05 22:24:29 -04002312 if (elf_coredump_extra_notes_write(cprm))
Michael Ellermane5501492007-09-19 14:38:12 +10002313 goto end_coredump;
Dwayne Grant McConnellbf1ab972006-11-23 00:46:37 +01002314
Andi Kleend025c9d2006-09-30 23:29:28 -07002315 /* Align to page */
Mateusz Guzik1607f092016-06-05 23:14:14 +02002316 if (!dump_skip(cprm, dataoff - cprm->pos))
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002317 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002318
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002319 for (i = 0, vma = first_vma(current, gate_vma); vma != NULL;
Roland McGrathf47aef52007-01-26 00:56:49 -08002320 vma = next_vma(vma, gate_vma)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002321 unsigned long addr;
Roland McGrath82df3972007-10-16 23:27:02 -07002322 unsigned long end;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002323
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002324 end = vma->vm_start + vma_filesz[i++];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002325
Roland McGrath82df3972007-10-16 23:27:02 -07002326 for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) {
Jesper Juhlf4e5cc22006-06-23 02:05:35 -07002327 struct page *page;
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002328 int stop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002330 page = get_dump_page(addr);
2331 if (page) {
2332 void *kaddr = kmap(page);
Al Viro13046ec2013-10-05 18:08:47 -04002333 stop = !dump_emit(cprm, kaddr, PAGE_SIZE);
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002334 kunmap(page);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03002335 put_page(page);
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002336 } else
Al Viro9b56d542013-10-08 09:26:08 -04002337 stop = !dump_skip(cprm, PAGE_SIZE);
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07002338 if (stop)
2339 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340 }
2341 }
Dave Kleikamp68a5dc32017-01-11 13:25:00 -06002342 dump_truncate(cprm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002343
Al Viroaa3e7ea2013-10-05 17:50:15 -04002344 if (!elf_core_write_extra_data(cprm))
Daisuke HATAYAMA1fcccba2010-03-05 13:44:07 -08002345 goto end_coredump;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002346
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002347 if (e_phnum == PN_XNUM) {
Al Viro13046ec2013-10-05 18:08:47 -04002348 if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum)))
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002349 goto end_coredump;
2350 }
2351
Linus Torvalds1da177e2005-04-16 15:20:36 -07002352end_coredump:
2353 set_fs(fs);
2354
2355cleanup:
Roland McGrath3aba4812008-01-30 13:31:44 +01002356 free_note_info(&info);
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08002357 kfree(shdr4extnum);
Jungseung Lee52f5592e2014-12-10 15:52:16 -08002358 kfree(vma_filesz);
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08002359 kfree(phdr4note);
WANG Cong5f719552008-05-06 12:45:35 +08002360 kfree(elf);
2361out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002362 return has_dumped;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002363}
2364
Christoph Hellwig698ba7b2009-12-15 16:47:37 -08002365#endif /* CONFIG_ELF_CORE */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002366
2367static int __init init_elf_binfmt(void)
2368{
Al Viro8fc3dc52012-03-17 03:05:16 -04002369 register_binfmt(&elf_format);
2370 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002371}
2372
2373static void __exit exit_elf_binfmt(void)
2374{
2375 /* Remove the COFF and ELF loaders. */
2376 unregister_binfmt(&elf_format);
2377}
2378
2379core_initcall(init_elf_binfmt);
2380module_exit(exit_elf_binfmt);
2381MODULE_LICENSE("GPL");