Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
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> | |
1da177e4 LT |
15 | #include <linux/mm.h> |
16 | #include <linux/mman.h> | |
1da177e4 LT |
17 | #include <linux/errno.h> |
18 | #include <linux/signal.h> | |
19 | #include <linux/binfmts.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/file.h> | |
1da177e4 | 22 | #include <linux/slab.h> |
1da177e4 LT |
23 | #include <linux/personality.h> |
24 | #include <linux/elfcore.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/highuid.h> | |
1da177e4 LT |
27 | #include <linux/compiler.h> |
28 | #include <linux/highmem.h> | |
29 | #include <linux/pagemap.h> | |
2aa362c4 | 30 | #include <linux/vmalloc.h> |
1da177e4 | 31 | #include <linux/security.h> |
1da177e4 | 32 | #include <linux/random.h> |
f4e5cc2c | 33 | #include <linux/elf.h> |
d1fd836d | 34 | #include <linux/elf-randomize.h> |
7e80d0d0 | 35 | #include <linux/utsname.h> |
088e7af7 | 36 | #include <linux/coredump.h> |
6fac4829 | 37 | #include <linux/sched.h> |
f7ccbae4 | 38 | #include <linux/sched/coredump.h> |
68db0cf1 | 39 | #include <linux/sched/task_stack.h> |
32ef5517 | 40 | #include <linux/sched/cputime.h> |
5b825c3a | 41 | #include <linux/cred.h> |
5037835c | 42 | #include <linux/dax.h> |
7c0f6ba6 | 43 | #include <linux/uaccess.h> |
1da177e4 LT |
44 | #include <asm/param.h> |
45 | #include <asm/page.h> | |
46 | ||
2aa362c4 DV |
47 | #ifndef user_long_t |
48 | #define user_long_t long | |
49 | #endif | |
49ae4d4b DV |
50 | #ifndef user_siginfo_t |
51 | #define user_siginfo_t siginfo_t | |
52 | #endif | |
53 | ||
4755200b NP |
54 | /* That's for binfmt_elf_fdpic to deal with */ |
55 | #ifndef elf_check_fdpic | |
56 | #define elf_check_fdpic(ex) false | |
57 | #endif | |
58 | ||
71613c3b | 59 | static int load_elf_binary(struct linux_binprm *bprm); |
bb1ad820 AM |
60 | static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *, |
61 | int, int, unsigned long); | |
1da177e4 | 62 | |
69369a70 JT |
63 | #ifdef CONFIG_USELIB |
64 | static int load_elf_library(struct file *); | |
65 | #else | |
66 | #define load_elf_library NULL | |
67 | #endif | |
68 | ||
1da177e4 LT |
69 | /* |
70 | * If we don't support core dumping, then supply a NULL so we | |
71 | * don't even try. | |
72 | */ | |
698ba7b5 | 73 | #ifdef CONFIG_ELF_CORE |
f6151dfe | 74 | static int elf_core_dump(struct coredump_params *cprm); |
1da177e4 LT |
75 | #else |
76 | #define elf_core_dump NULL | |
77 | #endif | |
78 | ||
79 | #if ELF_EXEC_PAGESIZE > PAGE_SIZE | |
f4e5cc2c | 80 | #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE |
1da177e4 | 81 | #else |
f4e5cc2c | 82 | #define ELF_MIN_ALIGN PAGE_SIZE |
1da177e4 LT |
83 | #endif |
84 | ||
85 | #ifndef ELF_CORE_EFLAGS | |
86 | #define ELF_CORE_EFLAGS 0 | |
87 | #endif | |
88 | ||
89 | #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1)) | |
90 | #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1)) | |
91 | #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1)) | |
92 | ||
93 | static struct linux_binfmt elf_format = { | |
f670d0ec MP |
94 | .module = THIS_MODULE, |
95 | .load_binary = load_elf_binary, | |
96 | .load_shlib = load_elf_library, | |
97 | .core_dump = elf_core_dump, | |
98 | .min_coredump = ELF_EXEC_PAGESIZE, | |
1da177e4 LT |
99 | }; |
100 | ||
d4e3cc38 | 101 | #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE) |
1da177e4 | 102 | |
16e72e9b | 103 | static int set_brk(unsigned long start, unsigned long end, int prot) |
1da177e4 LT |
104 | { |
105 | start = ELF_PAGEALIGN(start); | |
106 | end = ELF_PAGEALIGN(end); | |
107 | if (end > start) { | |
16e72e9b DV |
108 | /* |
109 | * Map the last of the bss segment. | |
110 | * If the header is requesting these pages to be | |
111 | * executable, honour that (ppc32 needs this). | |
112 | */ | |
113 | int error = vm_brk_flags(start, end - start, | |
114 | prot & PROT_EXEC ? VM_EXEC : 0); | |
5d22fc25 LT |
115 | if (error) |
116 | return error; | |
1da177e4 LT |
117 | } |
118 | current->mm->start_brk = current->mm->brk = end; | |
119 | return 0; | |
120 | } | |
121 | ||
1da177e4 LT |
122 | /* We need to explicitly zero any fractional pages |
123 | after the data section (i.e. bss). This would | |
124 | contain the junk from the file that should not | |
f4e5cc2c JJ |
125 | be in memory |
126 | */ | |
1da177e4 LT |
127 | static int padzero(unsigned long elf_bss) |
128 | { | |
129 | unsigned long nbyte; | |
130 | ||
131 | nbyte = ELF_PAGEOFFSET(elf_bss); | |
132 | if (nbyte) { | |
133 | nbyte = ELF_MIN_ALIGN - nbyte; | |
134 | if (clear_user((void __user *) elf_bss, nbyte)) | |
135 | return -EFAULT; | |
136 | } | |
137 | return 0; | |
138 | } | |
139 | ||
09c6dd3c | 140 | /* Let's use some macros to make this stack manipulation a little clearer */ |
1da177e4 LT |
141 | #ifdef CONFIG_STACK_GROWSUP |
142 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items)) | |
143 | #define STACK_ROUND(sp, items) \ | |
144 | ((15 + (unsigned long) ((sp) + (items))) &~ 15UL) | |
f4e5cc2c JJ |
145 | #define STACK_ALLOC(sp, len) ({ \ |
146 | elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \ | |
147 | old_sp; }) | |
1da177e4 LT |
148 | #else |
149 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items)) | |
150 | #define STACK_ROUND(sp, items) \ | |
151 | (((unsigned long) (sp - items)) &~ 15UL) | |
152 | #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; }) | |
153 | #endif | |
154 | ||
483fad1c NL |
155 | #ifndef ELF_BASE_PLATFORM |
156 | /* | |
157 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. | |
158 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value | |
159 | * will be copied to the user stack in the same manner as AT_PLATFORM. | |
160 | */ | |
161 | #define ELF_BASE_PLATFORM NULL | |
162 | #endif | |
163 | ||
1da177e4 | 164 | static int |
f4e5cc2c | 165 | create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec, |
d20894a2 | 166 | unsigned long load_addr, unsigned long interp_load_addr) |
1da177e4 LT |
167 | { |
168 | unsigned long p = bprm->p; | |
169 | int argc = bprm->argc; | |
170 | int envc = bprm->envc; | |
1da177e4 LT |
171 | elf_addr_t __user *sp; |
172 | elf_addr_t __user *u_platform; | |
483fad1c | 173 | elf_addr_t __user *u_base_platform; |
f06295b4 | 174 | elf_addr_t __user *u_rand_bytes; |
1da177e4 | 175 | const char *k_platform = ELF_PLATFORM; |
483fad1c | 176 | const char *k_base_platform = ELF_BASE_PLATFORM; |
f06295b4 | 177 | unsigned char k_rand_bytes[16]; |
1da177e4 LT |
178 | int items; |
179 | elf_addr_t *elf_info; | |
180 | int ei_index = 0; | |
86a264ab | 181 | const struct cred *cred = current_cred(); |
b6a2fea3 | 182 | struct vm_area_struct *vma; |
1da177e4 | 183 | |
d68c9d6a FBH |
184 | /* |
185 | * In some cases (e.g. Hyper-Threading), we want to avoid L1 | |
186 | * evictions by the processes running on the same package. One | |
187 | * thing we can do is to shuffle the initial stack for them. | |
188 | */ | |
189 | ||
190 | p = arch_align_stack(p); | |
191 | ||
1da177e4 LT |
192 | /* |
193 | * If this architecture has a platform capability string, copy it | |
194 | * to userspace. In some cases (Sparc), this info is impossible | |
195 | * for userspace to get any other way, in others (i386) it is | |
196 | * merely difficult. | |
197 | */ | |
1da177e4 LT |
198 | u_platform = NULL; |
199 | if (k_platform) { | |
200 | size_t len = strlen(k_platform) + 1; | |
201 | ||
1da177e4 LT |
202 | u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); |
203 | if (__copy_to_user(u_platform, k_platform, len)) | |
204 | return -EFAULT; | |
205 | } | |
206 | ||
483fad1c NL |
207 | /* |
208 | * If this architecture has a "base" platform capability | |
209 | * string, copy it to userspace. | |
210 | */ | |
211 | u_base_platform = NULL; | |
212 | if (k_base_platform) { | |
213 | size_t len = strlen(k_base_platform) + 1; | |
214 | ||
215 | u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); | |
216 | if (__copy_to_user(u_base_platform, k_base_platform, len)) | |
217 | return -EFAULT; | |
218 | } | |
219 | ||
f06295b4 KC |
220 | /* |
221 | * Generate 16 random bytes for userspace PRNG seeding. | |
222 | */ | |
223 | get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes)); | |
224 | u_rand_bytes = (elf_addr_t __user *) | |
225 | STACK_ALLOC(p, sizeof(k_rand_bytes)); | |
226 | if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes))) | |
227 | return -EFAULT; | |
228 | ||
1da177e4 | 229 | /* Create the ELF interpreter info */ |
785d5570 | 230 | elf_info = (elf_addr_t *)current->mm->saved_auxv; |
4f9a58d7 | 231 | /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */ |
1da177e4 | 232 | #define NEW_AUX_ENT(id, val) \ |
f4e5cc2c | 233 | do { \ |
785d5570 JJ |
234 | elf_info[ei_index++] = id; \ |
235 | elf_info[ei_index++] = val; \ | |
f4e5cc2c | 236 | } while (0) |
1da177e4 LT |
237 | |
238 | #ifdef ARCH_DLINFO | |
239 | /* | |
240 | * ARCH_DLINFO must come first so PPC can do its special alignment of | |
241 | * AUXV. | |
4f9a58d7 OH |
242 | * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in |
243 | * ARCH_DLINFO changes | |
1da177e4 LT |
244 | */ |
245 | ARCH_DLINFO; | |
246 | #endif | |
247 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); | |
248 | NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE); | |
249 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
250 | NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff); | |
f4e5cc2c | 251 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
1da177e4 LT |
252 | NEW_AUX_ENT(AT_PHNUM, exec->e_phnum); |
253 | NEW_AUX_ENT(AT_BASE, interp_load_addr); | |
254 | NEW_AUX_ENT(AT_FLAGS, 0); | |
255 | NEW_AUX_ENT(AT_ENTRY, exec->e_entry); | |
ebc887b2 EB |
256 | NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid)); |
257 | NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid)); | |
258 | NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid)); | |
259 | NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid)); | |
c425e189 | 260 | NEW_AUX_ENT(AT_SECURE, bprm->secureexec); |
f06295b4 | 261 | NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes); |
2171364d MN |
262 | #ifdef ELF_HWCAP2 |
263 | NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2); | |
264 | #endif | |
65191087 | 265 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
1da177e4 | 266 | if (k_platform) { |
f4e5cc2c | 267 | NEW_AUX_ENT(AT_PLATFORM, |
785d5570 | 268 | (elf_addr_t)(unsigned long)u_platform); |
1da177e4 | 269 | } |
483fad1c NL |
270 | if (k_base_platform) { |
271 | NEW_AUX_ENT(AT_BASE_PLATFORM, | |
272 | (elf_addr_t)(unsigned long)u_base_platform); | |
273 | } | |
1da177e4 | 274 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
785d5570 | 275 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); |
1da177e4 LT |
276 | } |
277 | #undef NEW_AUX_ENT | |
278 | /* AT_NULL is zero; clear the rest too */ | |
279 | memset(&elf_info[ei_index], 0, | |
280 | sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]); | |
281 | ||
282 | /* And advance past the AT_NULL entry. */ | |
283 | ei_index += 2; | |
284 | ||
285 | sp = STACK_ADD(p, ei_index); | |
286 | ||
d20894a2 | 287 | items = (argc + 1) + (envc + 1) + 1; |
1da177e4 LT |
288 | bprm->p = STACK_ROUND(sp, items); |
289 | ||
290 | /* Point sp at the lowest address on the stack */ | |
291 | #ifdef CONFIG_STACK_GROWSUP | |
292 | sp = (elf_addr_t __user *)bprm->p - items - ei_index; | |
f4e5cc2c | 293 | bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */ |
1da177e4 LT |
294 | #else |
295 | sp = (elf_addr_t __user *)bprm->p; | |
296 | #endif | |
297 | ||
b6a2fea3 OW |
298 | |
299 | /* | |
300 | * Grow the stack manually; some architectures have a limit on how | |
301 | * far ahead a user-space access may be in order to grow the stack. | |
302 | */ | |
303 | vma = find_extend_vma(current->mm, bprm->p); | |
304 | if (!vma) | |
305 | return -EFAULT; | |
306 | ||
1da177e4 LT |
307 | /* Now, let's put argc (and argv, envp if appropriate) on the stack */ |
308 | if (__put_user(argc, sp++)) | |
309 | return -EFAULT; | |
1da177e4 | 310 | |
67c6777a | 311 | /* Populate list of argv pointers back to argv strings. */ |
a84a5059 | 312 | p = current->mm->arg_end = current->mm->arg_start; |
1da177e4 LT |
313 | while (argc-- > 0) { |
314 | size_t len; | |
67c6777a | 315 | if (__put_user((elf_addr_t)p, sp++)) |
841d5fb7 | 316 | return -EFAULT; |
b6a2fea3 OW |
317 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
318 | if (!len || len > MAX_ARG_STRLEN) | |
23c4971e | 319 | return -EINVAL; |
1da177e4 LT |
320 | p += len; |
321 | } | |
67c6777a | 322 | if (__put_user(0, sp++)) |
1da177e4 | 323 | return -EFAULT; |
67c6777a KC |
324 | current->mm->arg_end = p; |
325 | ||
326 | /* Populate list of envp pointers back to envp strings. */ | |
327 | current->mm->env_end = current->mm->env_start = p; | |
1da177e4 LT |
328 | while (envc-- > 0) { |
329 | size_t len; | |
67c6777a | 330 | if (__put_user((elf_addr_t)p, sp++)) |
841d5fb7 | 331 | return -EFAULT; |
b6a2fea3 OW |
332 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
333 | if (!len || len > MAX_ARG_STRLEN) | |
23c4971e | 334 | return -EINVAL; |
1da177e4 LT |
335 | p += len; |
336 | } | |
67c6777a | 337 | if (__put_user(0, sp++)) |
1da177e4 LT |
338 | return -EFAULT; |
339 | current->mm->env_end = p; | |
340 | ||
341 | /* Put the elf_info on the stack in the right place. */ | |
1da177e4 LT |
342 | if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t))) |
343 | return -EFAULT; | |
344 | return 0; | |
345 | } | |
346 | ||
c07380be JH |
347 | #ifndef elf_map |
348 | ||
1da177e4 | 349 | static unsigned long elf_map(struct file *filep, unsigned long addr, |
cc503c1b JK |
350 | struct elf_phdr *eppnt, int prot, int type, |
351 | unsigned long total_size) | |
1da177e4 LT |
352 | { |
353 | unsigned long map_addr; | |
cc503c1b JK |
354 | unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr); |
355 | unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr); | |
356 | addr = ELF_PAGESTART(addr); | |
357 | size = ELF_PAGEALIGN(size); | |
1da177e4 | 358 | |
dda6ebde DG |
359 | /* mmap() will return -EINVAL if given a zero size, but a |
360 | * segment with zero filesize is perfectly valid */ | |
cc503c1b JK |
361 | if (!size) |
362 | return addr; | |
363 | ||
cc503c1b JK |
364 | /* |
365 | * total_size is the size of the ELF (interpreter) image. | |
366 | * The _first_ mmap needs to know the full size, otherwise | |
367 | * randomization might put this image into an overlapping | |
368 | * position with the ELF binary image. (since size < total_size) | |
369 | * So we first map the 'big' image - and unmap the remainder at | |
370 | * the end. (which unmap is needed for ELF images with holes.) | |
371 | */ | |
372 | if (total_size) { | |
373 | total_size = ELF_PAGEALIGN(total_size); | |
5a5e4c2e | 374 | map_addr = vm_mmap(filep, addr, total_size, prot, type, off); |
cc503c1b | 375 | if (!BAD_ADDR(map_addr)) |
5a5e4c2e | 376 | vm_munmap(map_addr+size, total_size-size); |
cc503c1b | 377 | } else |
5a5e4c2e | 378 | map_addr = vm_mmap(filep, addr, size, prot, type, off); |
cc503c1b | 379 | |
1da177e4 LT |
380 | return(map_addr); |
381 | } | |
382 | ||
c07380be JH |
383 | #endif /* !elf_map */ |
384 | ||
cc503c1b JK |
385 | static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr) |
386 | { | |
387 | int i, first_idx = -1, last_idx = -1; | |
388 | ||
389 | for (i = 0; i < nr; i++) { | |
390 | if (cmds[i].p_type == PT_LOAD) { | |
391 | last_idx = i; | |
392 | if (first_idx == -1) | |
393 | first_idx = i; | |
394 | } | |
395 | } | |
396 | if (first_idx == -1) | |
397 | return 0; | |
398 | ||
399 | return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz - | |
400 | ELF_PAGESTART(cmds[first_idx].p_vaddr); | |
401 | } | |
402 | ||
6a8d3894 PB |
403 | /** |
404 | * load_elf_phdrs() - load ELF program headers | |
405 | * @elf_ex: ELF header of the binary whose program headers should be loaded | |
406 | * @elf_file: the opened ELF binary file | |
407 | * | |
408 | * Loads ELF program headers from the binary file elf_file, which has the ELF | |
409 | * header pointed to by elf_ex, into a newly allocated array. The caller is | |
410 | * responsible for freeing the allocated data. Returns an ERR_PTR upon failure. | |
411 | */ | |
412 | static struct elf_phdr *load_elf_phdrs(struct elfhdr *elf_ex, | |
413 | struct file *elf_file) | |
414 | { | |
415 | struct elf_phdr *elf_phdata = NULL; | |
416 | int retval, size, err = -1; | |
bdd1d2d3 | 417 | loff_t pos = elf_ex->e_phoff; |
6a8d3894 PB |
418 | |
419 | /* | |
420 | * If the size of this structure has changed, then punt, since | |
421 | * we will be doing the wrong thing. | |
422 | */ | |
423 | if (elf_ex->e_phentsize != sizeof(struct elf_phdr)) | |
424 | goto out; | |
425 | ||
426 | /* Sanity check the number of program headers... */ | |
427 | if (elf_ex->e_phnum < 1 || | |
428 | elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr)) | |
429 | goto out; | |
430 | ||
431 | /* ...and their total size. */ | |
432 | size = sizeof(struct elf_phdr) * elf_ex->e_phnum; | |
433 | if (size > ELF_MIN_ALIGN) | |
434 | goto out; | |
435 | ||
436 | elf_phdata = kmalloc(size, GFP_KERNEL); | |
437 | if (!elf_phdata) | |
438 | goto out; | |
439 | ||
440 | /* Read in the program headers */ | |
bdd1d2d3 | 441 | retval = kernel_read(elf_file, elf_phdata, size, &pos); |
6a8d3894 PB |
442 | if (retval != size) { |
443 | err = (retval < 0) ? retval : -EIO; | |
444 | goto out; | |
445 | } | |
446 | ||
447 | /* Success! */ | |
448 | err = 0; | |
449 | out: | |
450 | if (err) { | |
451 | kfree(elf_phdata); | |
452 | elf_phdata = NULL; | |
453 | } | |
454 | return elf_phdata; | |
455 | } | |
cc503c1b | 456 | |
774c105e PB |
457 | #ifndef CONFIG_ARCH_BINFMT_ELF_STATE |
458 | ||
459 | /** | |
460 | * struct arch_elf_state - arch-specific ELF loading state | |
461 | * | |
462 | * This structure is used to preserve architecture specific data during | |
463 | * the loading of an ELF file, throughout the checking of architecture | |
464 | * specific ELF headers & through to the point where the ELF load is | |
465 | * known to be proceeding (ie. SET_PERSONALITY). | |
466 | * | |
467 | * This implementation is a dummy for architectures which require no | |
468 | * specific state. | |
469 | */ | |
470 | struct arch_elf_state { | |
471 | }; | |
472 | ||
473 | #define INIT_ARCH_ELF_STATE {} | |
474 | ||
475 | /** | |
476 | * arch_elf_pt_proc() - check a PT_LOPROC..PT_HIPROC ELF program header | |
477 | * @ehdr: The main ELF header | |
478 | * @phdr: The program header to check | |
479 | * @elf: The open ELF file | |
480 | * @is_interp: True if the phdr is from the interpreter of the ELF being | |
481 | * loaded, else false. | |
482 | * @state: Architecture-specific state preserved throughout the process | |
483 | * of loading the ELF. | |
484 | * | |
485 | * Inspects the program header phdr to validate its correctness and/or | |
486 | * suitability for the system. Called once per ELF program header in the | |
487 | * range PT_LOPROC to PT_HIPROC, for both the ELF being loaded and its | |
488 | * interpreter. | |
489 | * | |
490 | * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load | |
491 | * with that return code. | |
492 | */ | |
493 | static inline int arch_elf_pt_proc(struct elfhdr *ehdr, | |
494 | struct elf_phdr *phdr, | |
495 | struct file *elf, bool is_interp, | |
496 | struct arch_elf_state *state) | |
497 | { | |
498 | /* Dummy implementation, always proceed */ | |
499 | return 0; | |
500 | } | |
501 | ||
502 | /** | |
54d15714 | 503 | * arch_check_elf() - check an ELF executable |
774c105e PB |
504 | * @ehdr: The main ELF header |
505 | * @has_interp: True if the ELF has an interpreter, else false. | |
eb4bc076 | 506 | * @interp_ehdr: The interpreter's ELF header |
774c105e PB |
507 | * @state: Architecture-specific state preserved throughout the process |
508 | * of loading the ELF. | |
509 | * | |
510 | * Provides a final opportunity for architecture code to reject the loading | |
511 | * of the ELF & cause an exec syscall to return an error. This is called after | |
512 | * all program headers to be checked by arch_elf_pt_proc have been. | |
513 | * | |
514 | * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load | |
515 | * with that return code. | |
516 | */ | |
517 | static inline int arch_check_elf(struct elfhdr *ehdr, bool has_interp, | |
eb4bc076 | 518 | struct elfhdr *interp_ehdr, |
774c105e PB |
519 | struct arch_elf_state *state) |
520 | { | |
521 | /* Dummy implementation, always proceed */ | |
522 | return 0; | |
523 | } | |
524 | ||
525 | #endif /* !CONFIG_ARCH_BINFMT_ELF_STATE */ | |
cc503c1b | 526 | |
1da177e4 LT |
527 | /* This is much more generalized than the library routine read function, |
528 | so we keep this separate. Technically the library read function | |
529 | is only provided so that we can read a.out libraries that have | |
530 | an ELF header */ | |
531 | ||
f4e5cc2c | 532 | static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex, |
cc503c1b | 533 | struct file *interpreter, unsigned long *interp_map_addr, |
a9d9ef13 | 534 | unsigned long no_base, struct elf_phdr *interp_elf_phdata) |
1da177e4 | 535 | { |
1da177e4 LT |
536 | struct elf_phdr *eppnt; |
537 | unsigned long load_addr = 0; | |
538 | int load_addr_set = 0; | |
539 | unsigned long last_bss = 0, elf_bss = 0; | |
16e72e9b | 540 | int bss_prot = 0; |
1da177e4 | 541 | unsigned long error = ~0UL; |
cc503c1b | 542 | unsigned long total_size; |
6a8d3894 | 543 | int i; |
1da177e4 LT |
544 | |
545 | /* First of all, some simple consistency checks */ | |
546 | if (interp_elf_ex->e_type != ET_EXEC && | |
547 | interp_elf_ex->e_type != ET_DYN) | |
548 | goto out; | |
4755200b NP |
549 | if (!elf_check_arch(interp_elf_ex) || |
550 | elf_check_fdpic(interp_elf_ex)) | |
1da177e4 | 551 | goto out; |
72c2d531 | 552 | if (!interpreter->f_op->mmap) |
1da177e4 LT |
553 | goto out; |
554 | ||
a9d9ef13 PB |
555 | total_size = total_mapping_size(interp_elf_phdata, |
556 | interp_elf_ex->e_phnum); | |
cc503c1b JK |
557 | if (!total_size) { |
558 | error = -EINVAL; | |
a9d9ef13 | 559 | goto out; |
cc503c1b JK |
560 | } |
561 | ||
a9d9ef13 | 562 | eppnt = interp_elf_phdata; |
f4e5cc2c JJ |
563 | for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) { |
564 | if (eppnt->p_type == PT_LOAD) { | |
565 | int elf_type = MAP_PRIVATE | MAP_DENYWRITE; | |
566 | int elf_prot = 0; | |
567 | unsigned long vaddr = 0; | |
568 | unsigned long k, map_addr; | |
569 | ||
570 | if (eppnt->p_flags & PF_R) | |
571 | elf_prot = PROT_READ; | |
572 | if (eppnt->p_flags & PF_W) | |
573 | elf_prot |= PROT_WRITE; | |
574 | if (eppnt->p_flags & PF_X) | |
575 | elf_prot |= PROT_EXEC; | |
576 | vaddr = eppnt->p_vaddr; | |
577 | if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) | |
578 | elf_type |= MAP_FIXED; | |
cc503c1b JK |
579 | else if (no_base && interp_elf_ex->e_type == ET_DYN) |
580 | load_addr = -vaddr; | |
f4e5cc2c JJ |
581 | |
582 | map_addr = elf_map(interpreter, load_addr + vaddr, | |
bb1ad820 | 583 | eppnt, elf_prot, elf_type, total_size); |
cc503c1b JK |
584 | total_size = 0; |
585 | if (!*interp_map_addr) | |
586 | *interp_map_addr = map_addr; | |
f4e5cc2c JJ |
587 | error = map_addr; |
588 | if (BAD_ADDR(map_addr)) | |
a9d9ef13 | 589 | goto out; |
f4e5cc2c JJ |
590 | |
591 | if (!load_addr_set && | |
592 | interp_elf_ex->e_type == ET_DYN) { | |
593 | load_addr = map_addr - ELF_PAGESTART(vaddr); | |
594 | load_addr_set = 1; | |
595 | } | |
596 | ||
597 | /* | |
598 | * Check to see if the section's size will overflow the | |
599 | * allowed task size. Note that p_filesz must always be | |
600 | * <= p_memsize so it's only necessary to check p_memsz. | |
601 | */ | |
602 | k = load_addr + eppnt->p_vaddr; | |
ce51059b | 603 | if (BAD_ADDR(k) || |
f4e5cc2c JJ |
604 | eppnt->p_filesz > eppnt->p_memsz || |
605 | eppnt->p_memsz > TASK_SIZE || | |
606 | TASK_SIZE - eppnt->p_memsz < k) { | |
607 | error = -ENOMEM; | |
a9d9ef13 | 608 | goto out; |
f4e5cc2c JJ |
609 | } |
610 | ||
611 | /* | |
612 | * Find the end of the file mapping for this phdr, and | |
613 | * keep track of the largest address we see for this. | |
614 | */ | |
615 | k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; | |
616 | if (k > elf_bss) | |
617 | elf_bss = k; | |
618 | ||
619 | /* | |
620 | * Do the same thing for the memory mapping - between | |
621 | * elf_bss and last_bss is the bss section. | |
622 | */ | |
0036d1f7 | 623 | k = load_addr + eppnt->p_vaddr + eppnt->p_memsz; |
16e72e9b | 624 | if (k > last_bss) { |
f4e5cc2c | 625 | last_bss = k; |
16e72e9b DV |
626 | bss_prot = elf_prot; |
627 | } | |
f4e5cc2c | 628 | } |
1da177e4 LT |
629 | } |
630 | ||
0036d1f7 KC |
631 | /* |
632 | * Now fill out the bss section: first pad the last page from | |
633 | * the file up to the page boundary, and zero it from elf_bss | |
634 | * up to the end of the page. | |
635 | */ | |
636 | if (padzero(elf_bss)) { | |
637 | error = -EFAULT; | |
638 | goto out; | |
639 | } | |
640 | /* | |
641 | * Next, align both the file and mem bss up to the page size, | |
642 | * since this is where elf_bss was just zeroed up to, and where | |
16e72e9b | 643 | * last_bss will end after the vm_brk_flags() below. |
0036d1f7 KC |
644 | */ |
645 | elf_bss = ELF_PAGEALIGN(elf_bss); | |
646 | last_bss = ELF_PAGEALIGN(last_bss); | |
647 | /* Finally, if there is still more bss to allocate, do it. */ | |
752015d1 | 648 | if (last_bss > elf_bss) { |
16e72e9b DV |
649 | error = vm_brk_flags(elf_bss, last_bss - elf_bss, |
650 | bss_prot & PROT_EXEC ? VM_EXEC : 0); | |
5d22fc25 | 651 | if (error) |
a9d9ef13 | 652 | goto out; |
1da177e4 LT |
653 | } |
654 | ||
cc503c1b | 655 | error = load_addr; |
1da177e4 LT |
656 | out: |
657 | return error; | |
658 | } | |
659 | ||
1da177e4 LT |
660 | /* |
661 | * These are the functions used to load ELF style executables and shared | |
662 | * libraries. There is no binary dependent code anywhere else. | |
663 | */ | |
664 | ||
913bd906 | 665 | #ifndef STACK_RND_MASK |
d1cabd63 | 666 | #define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) /* 8MB of VA */ |
913bd906 | 667 | #endif |
1da177e4 LT |
668 | |
669 | static unsigned long randomize_stack_top(unsigned long stack_top) | |
670 | { | |
4e7c22d4 | 671 | unsigned long random_variable = 0; |
1da177e4 | 672 | |
01578e36 | 673 | if (current->flags & PF_RANDOMIZE) { |
5ef11c35 | 674 | random_variable = get_random_long(); |
4e7c22d4 | 675 | random_variable &= STACK_RND_MASK; |
913bd906 AK |
676 | random_variable <<= PAGE_SHIFT; |
677 | } | |
1da177e4 | 678 | #ifdef CONFIG_STACK_GROWSUP |
913bd906 | 679 | return PAGE_ALIGN(stack_top) + random_variable; |
1da177e4 | 680 | #else |
913bd906 | 681 | return PAGE_ALIGN(stack_top) - random_variable; |
1da177e4 LT |
682 | #endif |
683 | } | |
684 | ||
71613c3b | 685 | static int load_elf_binary(struct linux_binprm *bprm) |
1da177e4 LT |
686 | { |
687 | struct file *interpreter = NULL; /* to shut gcc up */ | |
688 | unsigned long load_addr = 0, load_bias = 0; | |
689 | int load_addr_set = 0; | |
690 | char * elf_interpreter = NULL; | |
1da177e4 | 691 | unsigned long error; |
a9d9ef13 | 692 | struct elf_phdr *elf_ppnt, *elf_phdata, *interp_elf_phdata = NULL; |
1da177e4 | 693 | unsigned long elf_bss, elf_brk; |
16e72e9b | 694 | int bss_prot = 0; |
1da177e4 | 695 | int retval, i; |
cc503c1b JK |
696 | unsigned long elf_entry; |
697 | unsigned long interp_load_addr = 0; | |
1da177e4 | 698 | unsigned long start_code, end_code, start_data, end_data; |
1a530a6f | 699 | unsigned long reloc_func_desc __maybe_unused = 0; |
8de61e69 | 700 | int executable_stack = EXSTACK_DEFAULT; |
71613c3b | 701 | struct pt_regs *regs = current_pt_regs(); |
1da177e4 LT |
702 | struct { |
703 | struct elfhdr elf_ex; | |
704 | struct elfhdr interp_elf_ex; | |
1da177e4 | 705 | } *loc; |
774c105e | 706 | struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE; |
bdd1d2d3 | 707 | loff_t pos; |
1da177e4 LT |
708 | |
709 | loc = kmalloc(sizeof(*loc), GFP_KERNEL); | |
710 | if (!loc) { | |
711 | retval = -ENOMEM; | |
712 | goto out_ret; | |
713 | } | |
714 | ||
715 | /* Get the exec-header */ | |
f4e5cc2c | 716 | loc->elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4 LT |
717 | |
718 | retval = -ENOEXEC; | |
719 | /* First of all, some simple consistency checks */ | |
720 | if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
721 | goto out; | |
722 | ||
723 | if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN) | |
724 | goto out; | |
725 | if (!elf_check_arch(&loc->elf_ex)) | |
726 | goto out; | |
4755200b NP |
727 | if (elf_check_fdpic(&loc->elf_ex)) |
728 | goto out; | |
72c2d531 | 729 | if (!bprm->file->f_op->mmap) |
1da177e4 LT |
730 | goto out; |
731 | ||
6a8d3894 | 732 | elf_phdata = load_elf_phdrs(&loc->elf_ex, bprm->file); |
1da177e4 LT |
733 | if (!elf_phdata) |
734 | goto out; | |
735 | ||
1da177e4 LT |
736 | elf_ppnt = elf_phdata; |
737 | elf_bss = 0; | |
738 | elf_brk = 0; | |
739 | ||
740 | start_code = ~0UL; | |
741 | end_code = 0; | |
742 | start_data = 0; | |
743 | end_data = 0; | |
744 | ||
745 | for (i = 0; i < loc->elf_ex.e_phnum; i++) { | |
746 | if (elf_ppnt->p_type == PT_INTERP) { | |
747 | /* This is the program interpreter used for | |
748 | * shared libraries - for now assume that this | |
749 | * is an a.out format binary | |
750 | */ | |
1da177e4 LT |
751 | retval = -ENOEXEC; |
752 | if (elf_ppnt->p_filesz > PATH_MAX || | |
753 | elf_ppnt->p_filesz < 2) | |
e7b9b550 | 754 | goto out_free_ph; |
1da177e4 LT |
755 | |
756 | retval = -ENOMEM; | |
792db3af | 757 | elf_interpreter = kmalloc(elf_ppnt->p_filesz, |
f4e5cc2c | 758 | GFP_KERNEL); |
1da177e4 | 759 | if (!elf_interpreter) |
e7b9b550 | 760 | goto out_free_ph; |
1da177e4 | 761 | |
bdd1d2d3 CH |
762 | pos = elf_ppnt->p_offset; |
763 | retval = kernel_read(bprm->file, elf_interpreter, | |
764 | elf_ppnt->p_filesz, &pos); | |
1da177e4 LT |
765 | if (retval != elf_ppnt->p_filesz) { |
766 | if (retval >= 0) | |
767 | retval = -EIO; | |
768 | goto out_free_interp; | |
769 | } | |
770 | /* make sure path is NULL terminated */ | |
771 | retval = -ENOEXEC; | |
772 | if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0') | |
773 | goto out_free_interp; | |
774 | ||
1da177e4 LT |
775 | interpreter = open_exec(elf_interpreter); |
776 | retval = PTR_ERR(interpreter); | |
777 | if (IS_ERR(interpreter)) | |
778 | goto out_free_interp; | |
1fb84496 AD |
779 | |
780 | /* | |
781 | * If the binary is not readable then enforce | |
782 | * mm->dumpable = 0 regardless of the interpreter's | |
783 | * permissions. | |
784 | */ | |
1b5d783c | 785 | would_dump(bprm, interpreter); |
1fb84496 | 786 | |
b582ef5c | 787 | /* Get the exec headers */ |
bdd1d2d3 CH |
788 | pos = 0; |
789 | retval = kernel_read(interpreter, &loc->interp_elf_ex, | |
790 | sizeof(loc->interp_elf_ex), &pos); | |
b582ef5c | 791 | if (retval != sizeof(loc->interp_elf_ex)) { |
1da177e4 LT |
792 | if (retval >= 0) |
793 | retval = -EIO; | |
794 | goto out_free_dentry; | |
795 | } | |
796 | ||
1da177e4 LT |
797 | break; |
798 | } | |
799 | elf_ppnt++; | |
800 | } | |
801 | ||
802 | elf_ppnt = elf_phdata; | |
803 | for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) | |
774c105e PB |
804 | switch (elf_ppnt->p_type) { |
805 | case PT_GNU_STACK: | |
1da177e4 LT |
806 | if (elf_ppnt->p_flags & PF_X) |
807 | executable_stack = EXSTACK_ENABLE_X; | |
808 | else | |
809 | executable_stack = EXSTACK_DISABLE_X; | |
810 | break; | |
774c105e PB |
811 | |
812 | case PT_LOPROC ... PT_HIPROC: | |
813 | retval = arch_elf_pt_proc(&loc->elf_ex, elf_ppnt, | |
814 | bprm->file, false, | |
815 | &arch_state); | |
816 | if (retval) | |
817 | goto out_free_dentry; | |
818 | break; | |
1da177e4 | 819 | } |
1da177e4 LT |
820 | |
821 | /* Some simple consistency checks for the interpreter */ | |
822 | if (elf_interpreter) { | |
1da177e4 | 823 | retval = -ELIBBAD; |
d20894a2 AK |
824 | /* Not an ELF interpreter */ |
825 | if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1da177e4 | 826 | goto out_free_dentry; |
1da177e4 | 827 | /* Verify the interpreter has a valid arch */ |
4755200b NP |
828 | if (!elf_check_arch(&loc->interp_elf_ex) || |
829 | elf_check_fdpic(&loc->interp_elf_ex)) | |
1da177e4 | 830 | goto out_free_dentry; |
a9d9ef13 PB |
831 | |
832 | /* Load the interpreter program headers */ | |
833 | interp_elf_phdata = load_elf_phdrs(&loc->interp_elf_ex, | |
834 | interpreter); | |
835 | if (!interp_elf_phdata) | |
836 | goto out_free_dentry; | |
774c105e PB |
837 | |
838 | /* Pass PT_LOPROC..PT_HIPROC headers to arch code */ | |
839 | elf_ppnt = interp_elf_phdata; | |
840 | for (i = 0; i < loc->interp_elf_ex.e_phnum; i++, elf_ppnt++) | |
841 | switch (elf_ppnt->p_type) { | |
842 | case PT_LOPROC ... PT_HIPROC: | |
843 | retval = arch_elf_pt_proc(&loc->interp_elf_ex, | |
844 | elf_ppnt, interpreter, | |
845 | true, &arch_state); | |
846 | if (retval) | |
847 | goto out_free_dentry; | |
848 | break; | |
849 | } | |
1da177e4 LT |
850 | } |
851 | ||
774c105e PB |
852 | /* |
853 | * Allow arch code to reject the ELF at this point, whilst it's | |
854 | * still possible to return an error to the code that invoked | |
855 | * the exec syscall. | |
856 | */ | |
eb4bc076 MR |
857 | retval = arch_check_elf(&loc->elf_ex, |
858 | !!interpreter, &loc->interp_elf_ex, | |
859 | &arch_state); | |
774c105e PB |
860 | if (retval) |
861 | goto out_free_dentry; | |
862 | ||
1da177e4 LT |
863 | /* Flush all traces of the currently running executable */ |
864 | retval = flush_old_exec(bprm); | |
865 | if (retval) | |
866 | goto out_free_dentry; | |
867 | ||
1da177e4 LT |
868 | /* Do this immediately, since STACK_TOP as used in setup_arg_pages |
869 | may depend on the personality. */ | |
774c105e | 870 | SET_PERSONALITY2(loc->elf_ex, &arch_state); |
1da177e4 LT |
871 | if (elf_read_implies_exec(loc->elf_ex, executable_stack)) |
872 | current->personality |= READ_IMPLIES_EXEC; | |
873 | ||
f4e5cc2c | 874 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
1da177e4 | 875 | current->flags |= PF_RANDOMIZE; |
221af7f8 LT |
876 | |
877 | setup_new_exec(bprm); | |
9f834ec1 | 878 | install_exec_creds(bprm); |
1da177e4 LT |
879 | |
880 | /* Do this so that we can load the interpreter, if need be. We will | |
881 | change some of these later */ | |
1da177e4 LT |
882 | retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP), |
883 | executable_stack); | |
19d860a1 | 884 | if (retval < 0) |
1da177e4 | 885 | goto out_free_dentry; |
1da177e4 | 886 | |
1da177e4 LT |
887 | current->mm->start_stack = bprm->p; |
888 | ||
af901ca1 | 889 | /* Now we do a little grungy work by mmapping the ELF image into |
cc503c1b | 890 | the correct location in memory. */ |
f4e5cc2c JJ |
891 | for(i = 0, elf_ppnt = elf_phdata; |
892 | i < loc->elf_ex.e_phnum; i++, elf_ppnt++) { | |
1da177e4 LT |
893 | int elf_prot = 0, elf_flags; |
894 | unsigned long k, vaddr; | |
a87938b2 | 895 | unsigned long total_size = 0; |
1da177e4 LT |
896 | |
897 | if (elf_ppnt->p_type != PT_LOAD) | |
898 | continue; | |
899 | ||
900 | if (unlikely (elf_brk > elf_bss)) { | |
901 | unsigned long nbyte; | |
902 | ||
903 | /* There was a PT_LOAD segment with p_memsz > p_filesz | |
904 | before this one. Map anonymous pages, if needed, | |
905 | and clear the area. */ | |
f670d0ec | 906 | retval = set_brk(elf_bss + load_bias, |
16e72e9b DV |
907 | elf_brk + load_bias, |
908 | bss_prot); | |
19d860a1 | 909 | if (retval) |
1da177e4 | 910 | goto out_free_dentry; |
1da177e4 LT |
911 | nbyte = ELF_PAGEOFFSET(elf_bss); |
912 | if (nbyte) { | |
913 | nbyte = ELF_MIN_ALIGN - nbyte; | |
914 | if (nbyte > elf_brk - elf_bss) | |
915 | nbyte = elf_brk - elf_bss; | |
916 | if (clear_user((void __user *)elf_bss + | |
917 | load_bias, nbyte)) { | |
918 | /* | |
919 | * This bss-zeroing can fail if the ELF | |
f4e5cc2c | 920 | * file specifies odd protections. So |
1da177e4 LT |
921 | * we don't check the return value |
922 | */ | |
923 | } | |
924 | } | |
925 | } | |
926 | ||
f4e5cc2c JJ |
927 | if (elf_ppnt->p_flags & PF_R) |
928 | elf_prot |= PROT_READ; | |
929 | if (elf_ppnt->p_flags & PF_W) | |
930 | elf_prot |= PROT_WRITE; | |
931 | if (elf_ppnt->p_flags & PF_X) | |
932 | elf_prot |= PROT_EXEC; | |
1da177e4 | 933 | |
f4e5cc2c | 934 | elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE; |
1da177e4 LT |
935 | |
936 | vaddr = elf_ppnt->p_vaddr; | |
eab09532 KC |
937 | /* |
938 | * If we are loading ET_EXEC or we have already performed | |
939 | * the ET_DYN load_addr calculations, proceed normally. | |
940 | */ | |
1da177e4 LT |
941 | if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) { |
942 | elf_flags |= MAP_FIXED; | |
943 | } else if (loc->elf_ex.e_type == ET_DYN) { | |
eab09532 KC |
944 | /* |
945 | * This logic is run once for the first LOAD Program | |
946 | * Header for ET_DYN binaries to calculate the | |
947 | * randomization (load_bias) for all the LOAD | |
948 | * Program Headers, and to calculate the entire | |
949 | * size of the ELF mapping (total_size). (Note that | |
950 | * load_addr_set is set to true later once the | |
951 | * initial mapping is performed.) | |
952 | * | |
953 | * There are effectively two types of ET_DYN | |
954 | * binaries: programs (i.e. PIE: ET_DYN with INTERP) | |
955 | * and loaders (ET_DYN without INTERP, since they | |
956 | * _are_ the ELF interpreter). The loaders must | |
957 | * be loaded away from programs since the program | |
958 | * may otherwise collide with the loader (especially | |
959 | * for ET_EXEC which does not have a randomized | |
960 | * position). For example to handle invocations of | |
961 | * "./ld.so someprog" to test out a new version of | |
962 | * the loader, the subsequent program that the | |
963 | * loader loads must avoid the loader itself, so | |
964 | * they cannot share the same load range. Sufficient | |
965 | * room for the brk must be allocated with the | |
966 | * loader as well, since brk must be available with | |
967 | * the loader. | |
968 | * | |
969 | * Therefore, programs are loaded offset from | |
970 | * ELF_ET_DYN_BASE and loaders are loaded into the | |
971 | * independently randomized mmap region (0 load_bias | |
972 | * without MAP_FIXED). | |
973 | */ | |
974 | if (elf_interpreter) { | |
975 | load_bias = ELF_ET_DYN_BASE; | |
976 | if (current->flags & PF_RANDOMIZE) | |
977 | load_bias += arch_mmap_rnd(); | |
978 | elf_flags |= MAP_FIXED; | |
979 | } else | |
980 | load_bias = 0; | |
981 | ||
982 | /* | |
983 | * Since load_bias is used for all subsequent loading | |
984 | * calculations, we must lower it by the first vaddr | |
985 | * so that the remaining calculations based on the | |
986 | * ELF vaddrs will be correctly offset. The result | |
987 | * is then page aligned. | |
988 | */ | |
989 | load_bias = ELF_PAGESTART(load_bias - vaddr); | |
990 | ||
a87938b2 MD |
991 | total_size = total_mapping_size(elf_phdata, |
992 | loc->elf_ex.e_phnum); | |
993 | if (!total_size) { | |
2b1d3ae9 | 994 | retval = -EINVAL; |
a87938b2 MD |
995 | goto out_free_dentry; |
996 | } | |
1da177e4 LT |
997 | } |
998 | ||
f4e5cc2c | 999 | error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, |
a87938b2 | 1000 | elf_prot, elf_flags, total_size); |
1da177e4 | 1001 | if (BAD_ADDR(error)) { |
b140f251 AK |
1002 | retval = IS_ERR((void *)error) ? |
1003 | PTR_ERR((void*)error) : -EINVAL; | |
1da177e4 LT |
1004 | goto out_free_dentry; |
1005 | } | |
1006 | ||
1007 | if (!load_addr_set) { | |
1008 | load_addr_set = 1; | |
1009 | load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset); | |
1010 | if (loc->elf_ex.e_type == ET_DYN) { | |
1011 | load_bias += error - | |
1012 | ELF_PAGESTART(load_bias + vaddr); | |
1013 | load_addr += load_bias; | |
1014 | reloc_func_desc = load_bias; | |
1015 | } | |
1016 | } | |
1017 | k = elf_ppnt->p_vaddr; | |
f4e5cc2c JJ |
1018 | if (k < start_code) |
1019 | start_code = k; | |
1020 | if (start_data < k) | |
1021 | start_data = k; | |
1da177e4 LT |
1022 | |
1023 | /* | |
1024 | * Check to see if the section's size will overflow the | |
1025 | * allowed task size. Note that p_filesz must always be | |
1026 | * <= p_memsz so it is only necessary to check p_memsz. | |
1027 | */ | |
ce51059b | 1028 | if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz || |
1da177e4 LT |
1029 | elf_ppnt->p_memsz > TASK_SIZE || |
1030 | TASK_SIZE - elf_ppnt->p_memsz < k) { | |
f4e5cc2c | 1031 | /* set_brk can never work. Avoid overflows. */ |
b140f251 | 1032 | retval = -EINVAL; |
1da177e4 LT |
1033 | goto out_free_dentry; |
1034 | } | |
1035 | ||
1036 | k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; | |
1037 | ||
1038 | if (k > elf_bss) | |
1039 | elf_bss = k; | |
1040 | if ((elf_ppnt->p_flags & PF_X) && end_code < k) | |
1041 | end_code = k; | |
1042 | if (end_data < k) | |
1043 | end_data = k; | |
1044 | k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; | |
16e72e9b DV |
1045 | if (k > elf_brk) { |
1046 | bss_prot = elf_prot; | |
1da177e4 | 1047 | elf_brk = k; |
16e72e9b | 1048 | } |
1da177e4 LT |
1049 | } |
1050 | ||
1051 | loc->elf_ex.e_entry += load_bias; | |
1052 | elf_bss += load_bias; | |
1053 | elf_brk += load_bias; | |
1054 | start_code += load_bias; | |
1055 | end_code += load_bias; | |
1056 | start_data += load_bias; | |
1057 | end_data += load_bias; | |
1058 | ||
1059 | /* Calling set_brk effectively mmaps the pages that we need | |
1060 | * for the bss and break sections. We must do this before | |
1061 | * mapping in the interpreter, to make sure it doesn't wind | |
1062 | * up getting placed where the bss needs to go. | |
1063 | */ | |
16e72e9b | 1064 | retval = set_brk(elf_bss, elf_brk, bss_prot); |
19d860a1 | 1065 | if (retval) |
1da177e4 | 1066 | goto out_free_dentry; |
6de50517 | 1067 | if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) { |
1da177e4 LT |
1068 | retval = -EFAULT; /* Nobody gets to see this, but.. */ |
1069 | goto out_free_dentry; | |
1070 | } | |
1071 | ||
1072 | if (elf_interpreter) { | |
6eec482f | 1073 | unsigned long interp_map_addr = 0; |
d20894a2 AK |
1074 | |
1075 | elf_entry = load_elf_interp(&loc->interp_elf_ex, | |
1076 | interpreter, | |
1077 | &interp_map_addr, | |
a9d9ef13 | 1078 | load_bias, interp_elf_phdata); |
d20894a2 AK |
1079 | if (!IS_ERR((void *)elf_entry)) { |
1080 | /* | |
1081 | * load_elf_interp() returns relocation | |
1082 | * adjustment | |
1083 | */ | |
1084 | interp_load_addr = elf_entry; | |
1085 | elf_entry += loc->interp_elf_ex.e_entry; | |
cc503c1b | 1086 | } |
1da177e4 | 1087 | if (BAD_ADDR(elf_entry)) { |
ce51059b CE |
1088 | retval = IS_ERR((void *)elf_entry) ? |
1089 | (int)elf_entry : -EINVAL; | |
1da177e4 LT |
1090 | goto out_free_dentry; |
1091 | } | |
1092 | reloc_func_desc = interp_load_addr; | |
1093 | ||
1094 | allow_write_access(interpreter); | |
1095 | fput(interpreter); | |
1096 | kfree(elf_interpreter); | |
1097 | } else { | |
1098 | elf_entry = loc->elf_ex.e_entry; | |
5342fba5 | 1099 | if (BAD_ADDR(elf_entry)) { |
ce51059b | 1100 | retval = -EINVAL; |
5342fba5 SS |
1101 | goto out_free_dentry; |
1102 | } | |
1da177e4 LT |
1103 | } |
1104 | ||
774c105e | 1105 | kfree(interp_elf_phdata); |
1da177e4 LT |
1106 | kfree(elf_phdata); |
1107 | ||
1da177e4 LT |
1108 | set_binfmt(&elf_format); |
1109 | ||
547ee84c | 1110 | #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
fc5243d9 | 1111 | retval = arch_setup_additional_pages(bprm, !!elf_interpreter); |
19d860a1 | 1112 | if (retval < 0) |
18c8baff | 1113 | goto out; |
547ee84c BH |
1114 | #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */ |
1115 | ||
b6a2fea3 | 1116 | retval = create_elf_tables(bprm, &loc->elf_ex, |
f4e5cc2c | 1117 | load_addr, interp_load_addr); |
19d860a1 | 1118 | if (retval < 0) |
b6a2fea3 | 1119 | goto out; |
1da177e4 | 1120 | /* N.B. passed_fileno might not be initialized? */ |
1da177e4 LT |
1121 | current->mm->end_code = end_code; |
1122 | current->mm->start_code = start_code; | |
1123 | current->mm->start_data = start_data; | |
1124 | current->mm->end_data = end_data; | |
1125 | current->mm->start_stack = bprm->p; | |
1126 | ||
4471a675 | 1127 | if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) { |
c1d171a0 JK |
1128 | current->mm->brk = current->mm->start_brk = |
1129 | arch_randomize_brk(current->mm); | |
204db6ed | 1130 | #ifdef compat_brk_randomized |
4471a675 JK |
1131 | current->brk_randomized = 1; |
1132 | #endif | |
1133 | } | |
c1d171a0 | 1134 | |
1da177e4 LT |
1135 | if (current->personality & MMAP_PAGE_ZERO) { |
1136 | /* Why this, you ask??? Well SVr4 maps page 0 as read-only, | |
1137 | and some applications "depend" upon this behavior. | |
1138 | Since we do not have the power to recompile these, we | |
f4e5cc2c | 1139 | emulate the SVr4 behavior. Sigh. */ |
6be5ceb0 | 1140 | error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC, |
1da177e4 | 1141 | MAP_FIXED | MAP_PRIVATE, 0); |
1da177e4 LT |
1142 | } |
1143 | ||
1144 | #ifdef ELF_PLAT_INIT | |
1145 | /* | |
1146 | * The ABI may specify that certain registers be set up in special | |
1147 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
1148 | * example. In addition, it may also specify (eg, PowerPC64 ELF) | |
1149 | * that the e_entry field is the address of the function descriptor | |
1150 | * for the startup routine, rather than the address of the startup | |
1151 | * routine itself. This macro performs whatever initialization to | |
1152 | * the regs structure is required as well as any relocations to the | |
1153 | * function descriptor entries when executing dynamically links apps. | |
1154 | */ | |
1155 | ELF_PLAT_INIT(regs, reloc_func_desc); | |
1156 | #endif | |
1157 | ||
1158 | start_thread(regs, elf_entry, bprm->p); | |
1da177e4 LT |
1159 | retval = 0; |
1160 | out: | |
1161 | kfree(loc); | |
1162 | out_ret: | |
1163 | return retval; | |
1164 | ||
1165 | /* error cleanup */ | |
1166 | out_free_dentry: | |
a9d9ef13 | 1167 | kfree(interp_elf_phdata); |
1da177e4 LT |
1168 | allow_write_access(interpreter); |
1169 | if (interpreter) | |
1170 | fput(interpreter); | |
1171 | out_free_interp: | |
f99d49ad | 1172 | kfree(elf_interpreter); |
1da177e4 LT |
1173 | out_free_ph: |
1174 | kfree(elf_phdata); | |
1175 | goto out; | |
1176 | } | |
1177 | ||
69369a70 | 1178 | #ifdef CONFIG_USELIB |
1da177e4 LT |
1179 | /* This is really simpleminded and specialized - we are loading an |
1180 | a.out library that is given an ELF header. */ | |
1da177e4 LT |
1181 | static int load_elf_library(struct file *file) |
1182 | { | |
1183 | struct elf_phdr *elf_phdata; | |
1184 | struct elf_phdr *eppnt; | |
1185 | unsigned long elf_bss, bss, len; | |
1186 | int retval, error, i, j; | |
1187 | struct elfhdr elf_ex; | |
bdd1d2d3 | 1188 | loff_t pos = 0; |
1da177e4 LT |
1189 | |
1190 | error = -ENOEXEC; | |
bdd1d2d3 | 1191 | retval = kernel_read(file, &elf_ex, sizeof(elf_ex), &pos); |
1da177e4 LT |
1192 | if (retval != sizeof(elf_ex)) |
1193 | goto out; | |
1194 | ||
1195 | if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1196 | goto out; | |
1197 | ||
1198 | /* First of all, some simple consistency checks */ | |
1199 | if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 || | |
72c2d531 | 1200 | !elf_check_arch(&elf_ex) || !file->f_op->mmap) |
1da177e4 | 1201 | goto out; |
4755200b NP |
1202 | if (elf_check_fdpic(&elf_ex)) |
1203 | goto out; | |
1da177e4 LT |
1204 | |
1205 | /* Now read in all of the header information */ | |
1206 | ||
1207 | j = sizeof(struct elf_phdr) * elf_ex.e_phnum; | |
1208 | /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */ | |
1209 | ||
1210 | error = -ENOMEM; | |
1211 | elf_phdata = kmalloc(j, GFP_KERNEL); | |
1212 | if (!elf_phdata) | |
1213 | goto out; | |
1214 | ||
1215 | eppnt = elf_phdata; | |
1216 | error = -ENOEXEC; | |
bdd1d2d3 CH |
1217 | pos = elf_ex.e_phoff; |
1218 | retval = kernel_read(file, eppnt, j, &pos); | |
1da177e4 LT |
1219 | if (retval != j) |
1220 | goto out_free_ph; | |
1221 | ||
1222 | for (j = 0, i = 0; i<elf_ex.e_phnum; i++) | |
1223 | if ((eppnt + i)->p_type == PT_LOAD) | |
1224 | j++; | |
1225 | if (j != 1) | |
1226 | goto out_free_ph; | |
1227 | ||
1228 | while (eppnt->p_type != PT_LOAD) | |
1229 | eppnt++; | |
1230 | ||
1231 | /* Now use mmap to map the library into memory. */ | |
6be5ceb0 | 1232 | error = vm_mmap(file, |
1da177e4 LT |
1233 | ELF_PAGESTART(eppnt->p_vaddr), |
1234 | (eppnt->p_filesz + | |
1235 | ELF_PAGEOFFSET(eppnt->p_vaddr)), | |
1236 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
1237 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, | |
1238 | (eppnt->p_offset - | |
1239 | ELF_PAGEOFFSET(eppnt->p_vaddr))); | |
1da177e4 LT |
1240 | if (error != ELF_PAGESTART(eppnt->p_vaddr)) |
1241 | goto out_free_ph; | |
1242 | ||
1243 | elf_bss = eppnt->p_vaddr + eppnt->p_filesz; | |
1244 | if (padzero(elf_bss)) { | |
1245 | error = -EFAULT; | |
1246 | goto out_free_ph; | |
1247 | } | |
1248 | ||
f4e5cc2c JJ |
1249 | len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + |
1250 | ELF_MIN_ALIGN - 1); | |
1da177e4 | 1251 | bss = eppnt->p_memsz + eppnt->p_vaddr; |
ecc2bc8a MH |
1252 | if (bss > len) { |
1253 | error = vm_brk(len, bss - len); | |
5d22fc25 | 1254 | if (error) |
ecc2bc8a MH |
1255 | goto out_free_ph; |
1256 | } | |
1da177e4 LT |
1257 | error = 0; |
1258 | ||
1259 | out_free_ph: | |
1260 | kfree(elf_phdata); | |
1261 | out: | |
1262 | return error; | |
1263 | } | |
69369a70 | 1264 | #endif /* #ifdef CONFIG_USELIB */ |
1da177e4 | 1265 | |
698ba7b5 | 1266 | #ifdef CONFIG_ELF_CORE |
1da177e4 LT |
1267 | /* |
1268 | * ELF core dumper | |
1269 | * | |
1270 | * Modelled on fs/exec.c:aout_core_dump() | |
1271 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1272 | */ | |
1da177e4 | 1273 | |
909af768 JB |
1274 | /* |
1275 | * The purpose of always_dump_vma() is to make sure that special kernel mappings | |
1276 | * that are useful for post-mortem analysis are included in every core dump. | |
1277 | * In that way we ensure that the core dump is fully interpretable later | |
1278 | * without matching up the same kernel and hardware config to see what PC values | |
1279 | * meant. These special mappings include - vDSO, vsyscall, and other | |
1280 | * architecture specific mappings | |
1281 | */ | |
1282 | static bool always_dump_vma(struct vm_area_struct *vma) | |
1283 | { | |
1284 | /* Any vsyscall mappings? */ | |
1285 | if (vma == get_gate_vma(vma->vm_mm)) | |
1286 | return true; | |
78d683e8 AL |
1287 | |
1288 | /* | |
1289 | * Assume that all vmas with a .name op should always be dumped. | |
1290 | * If this changes, a new vm_ops field can easily be added. | |
1291 | */ | |
1292 | if (vma->vm_ops && vma->vm_ops->name && vma->vm_ops->name(vma)) | |
1293 | return true; | |
1294 | ||
909af768 JB |
1295 | /* |
1296 | * arch_vma_name() returns non-NULL for special architecture mappings, | |
1297 | * such as vDSO sections. | |
1298 | */ | |
1299 | if (arch_vma_name(vma)) | |
1300 | return true; | |
1301 | ||
1302 | return false; | |
1303 | } | |
1304 | ||
1da177e4 | 1305 | /* |
82df3973 | 1306 | * Decide what to dump of a segment, part, all or none. |
1da177e4 | 1307 | */ |
82df3973 RM |
1308 | static unsigned long vma_dump_size(struct vm_area_struct *vma, |
1309 | unsigned long mm_flags) | |
1da177e4 | 1310 | { |
e575f111 KM |
1311 | #define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type)) |
1312 | ||
909af768 JB |
1313 | /* always dump the vdso and vsyscall sections */ |
1314 | if (always_dump_vma(vma)) | |
82df3973 | 1315 | goto whole; |
e5b97dde | 1316 | |
0103bd16 | 1317 | if (vma->vm_flags & VM_DONTDUMP) |
accb61fe JB |
1318 | return 0; |
1319 | ||
5037835c RZ |
1320 | /* support for DAX */ |
1321 | if (vma_is_dax(vma)) { | |
1322 | if ((vma->vm_flags & VM_SHARED) && FILTER(DAX_SHARED)) | |
1323 | goto whole; | |
1324 | if (!(vma->vm_flags & VM_SHARED) && FILTER(DAX_PRIVATE)) | |
1325 | goto whole; | |
1326 | return 0; | |
1327 | } | |
1328 | ||
e575f111 KM |
1329 | /* Hugetlb memory check */ |
1330 | if (vma->vm_flags & VM_HUGETLB) { | |
1331 | if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED)) | |
1332 | goto whole; | |
1333 | if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE)) | |
1334 | goto whole; | |
23d9e482 | 1335 | return 0; |
e575f111 KM |
1336 | } |
1337 | ||
1da177e4 | 1338 | /* Do not dump I/O mapped devices or special mappings */ |
314e51b9 | 1339 | if (vma->vm_flags & VM_IO) |
1da177e4 LT |
1340 | return 0; |
1341 | ||
a1b59e80 KH |
1342 | /* By default, dump shared memory if mapped from an anonymous file. */ |
1343 | if (vma->vm_flags & VM_SHARED) { | |
496ad9aa | 1344 | if (file_inode(vma->vm_file)->i_nlink == 0 ? |
82df3973 RM |
1345 | FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED)) |
1346 | goto whole; | |
1347 | return 0; | |
a1b59e80 | 1348 | } |
1da177e4 | 1349 | |
82df3973 RM |
1350 | /* Dump segments that have been written to. */ |
1351 | if (vma->anon_vma && FILTER(ANON_PRIVATE)) | |
1352 | goto whole; | |
1353 | if (vma->vm_file == NULL) | |
1354 | return 0; | |
1da177e4 | 1355 | |
82df3973 RM |
1356 | if (FILTER(MAPPED_PRIVATE)) |
1357 | goto whole; | |
1358 | ||
1359 | /* | |
1360 | * If this looks like the beginning of a DSO or executable mapping, | |
1361 | * check for an ELF header. If we find one, dump the first page to | |
1362 | * aid in determining what was mapped here. | |
1363 | */ | |
92dc07b1 RM |
1364 | if (FILTER(ELF_HEADERS) && |
1365 | vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) { | |
82df3973 RM |
1366 | u32 __user *header = (u32 __user *) vma->vm_start; |
1367 | u32 word; | |
92dc07b1 | 1368 | mm_segment_t fs = get_fs(); |
82df3973 RM |
1369 | /* |
1370 | * Doing it this way gets the constant folded by GCC. | |
1371 | */ | |
1372 | union { | |
1373 | u32 cmp; | |
1374 | char elfmag[SELFMAG]; | |
1375 | } magic; | |
1376 | BUILD_BUG_ON(SELFMAG != sizeof word); | |
1377 | magic.elfmag[EI_MAG0] = ELFMAG0; | |
1378 | magic.elfmag[EI_MAG1] = ELFMAG1; | |
1379 | magic.elfmag[EI_MAG2] = ELFMAG2; | |
1380 | magic.elfmag[EI_MAG3] = ELFMAG3; | |
92dc07b1 RM |
1381 | /* |
1382 | * Switch to the user "segment" for get_user(), | |
1383 | * then put back what elf_core_dump() had in place. | |
1384 | */ | |
1385 | set_fs(USER_DS); | |
1386 | if (unlikely(get_user(word, header))) | |
1387 | word = 0; | |
1388 | set_fs(fs); | |
1389 | if (word == magic.cmp) | |
82df3973 RM |
1390 | return PAGE_SIZE; |
1391 | } | |
1392 | ||
1393 | #undef FILTER | |
1394 | ||
1395 | return 0; | |
1396 | ||
1397 | whole: | |
1398 | return vma->vm_end - vma->vm_start; | |
1da177e4 LT |
1399 | } |
1400 | ||
1da177e4 LT |
1401 | /* An ELF note in memory */ |
1402 | struct memelfnote | |
1403 | { | |
1404 | const char *name; | |
1405 | int type; | |
1406 | unsigned int datasz; | |
1407 | void *data; | |
1408 | }; | |
1409 | ||
1410 | static int notesize(struct memelfnote *en) | |
1411 | { | |
1412 | int sz; | |
1413 | ||
1414 | sz = sizeof(struct elf_note); | |
1415 | sz += roundup(strlen(en->name) + 1, 4); | |
1416 | sz += roundup(en->datasz, 4); | |
1417 | ||
1418 | return sz; | |
1419 | } | |
1420 | ||
ecc8c772 | 1421 | static int writenote(struct memelfnote *men, struct coredump_params *cprm) |
d025c9db AK |
1422 | { |
1423 | struct elf_note en; | |
1da177e4 LT |
1424 | en.n_namesz = strlen(men->name) + 1; |
1425 | en.n_descsz = men->datasz; | |
1426 | en.n_type = men->type; | |
1427 | ||
ecc8c772 | 1428 | return dump_emit(cprm, &en, sizeof(en)) && |
22a8cb82 AV |
1429 | dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) && |
1430 | dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4); | |
1da177e4 | 1431 | } |
1da177e4 | 1432 | |
3aba481f | 1433 | static void fill_elf_header(struct elfhdr *elf, int segs, |
d3330cf0 | 1434 | u16 machine, u32 flags) |
1da177e4 | 1435 | { |
6970c8ef CG |
1436 | memset(elf, 0, sizeof(*elf)); |
1437 | ||
1da177e4 LT |
1438 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
1439 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1440 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1441 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1442 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1da177e4 LT |
1443 | |
1444 | elf->e_type = ET_CORE; | |
3aba481f | 1445 | elf->e_machine = machine; |
1da177e4 | 1446 | elf->e_version = EV_CURRENT; |
1da177e4 | 1447 | elf->e_phoff = sizeof(struct elfhdr); |
3aba481f | 1448 | elf->e_flags = flags; |
1da177e4 LT |
1449 | elf->e_ehsize = sizeof(struct elfhdr); |
1450 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1451 | elf->e_phnum = segs; | |
6970c8ef | 1452 | |
1da177e4 LT |
1453 | return; |
1454 | } | |
1455 | ||
8d6b5eee | 1456 | static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1da177e4 LT |
1457 | { |
1458 | phdr->p_type = PT_NOTE; | |
1459 | phdr->p_offset = offset; | |
1460 | phdr->p_vaddr = 0; | |
1461 | phdr->p_paddr = 0; | |
1462 | phdr->p_filesz = sz; | |
1463 | phdr->p_memsz = 0; | |
1464 | phdr->p_flags = 0; | |
1465 | phdr->p_align = 0; | |
1466 | return; | |
1467 | } | |
1468 | ||
1469 | static void fill_note(struct memelfnote *note, const char *name, int type, | |
1470 | unsigned int sz, void *data) | |
1471 | { | |
1472 | note->name = name; | |
1473 | note->type = type; | |
1474 | note->datasz = sz; | |
1475 | note->data = data; | |
1476 | return; | |
1477 | } | |
1478 | ||
1479 | /* | |
f4e5cc2c JJ |
1480 | * fill up all the fields in prstatus from the given task struct, except |
1481 | * registers which need to be filled up separately. | |
1da177e4 LT |
1482 | */ |
1483 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
f4e5cc2c | 1484 | struct task_struct *p, long signr) |
1da177e4 LT |
1485 | { |
1486 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1487 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1488 | prstatus->pr_sighold = p->blocked.sig[0]; | |
3b34fc58 ON |
1489 | rcu_read_lock(); |
1490 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1491 | rcu_read_unlock(); | |
b488893a | 1492 | prstatus->pr_pid = task_pid_vnr(p); |
b488893a PE |
1493 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1494 | prstatus->pr_sid = task_session_vnr(p); | |
1da177e4 | 1495 | if (thread_group_leader(p)) { |
cd19c364 | 1496 | struct task_cputime cputime; |
f06febc9 | 1497 | |
1da177e4 | 1498 | /* |
f06febc9 FM |
1499 | * This is the record for the group leader. It shows the |
1500 | * group-wide total, not its individual thread total. | |
1da177e4 | 1501 | */ |
cd19c364 FW |
1502 | thread_group_cputime(p, &cputime); |
1503 | prstatus->pr_utime = ns_to_timeval(cputime.utime); | |
1504 | prstatus->pr_stime = ns_to_timeval(cputime.stime); | |
1da177e4 | 1505 | } else { |
cd19c364 | 1506 | u64 utime, stime; |
6fac4829 | 1507 | |
cd19c364 FW |
1508 | task_cputime(p, &utime, &stime); |
1509 | prstatus->pr_utime = ns_to_timeval(utime); | |
1510 | prstatus->pr_stime = ns_to_timeval(stime); | |
1da177e4 | 1511 | } |
5613fda9 | 1512 | |
cd19c364 FW |
1513 | prstatus->pr_cutime = ns_to_timeval(p->signal->cutime); |
1514 | prstatus->pr_cstime = ns_to_timeval(p->signal->cstime); | |
1da177e4 LT |
1515 | } |
1516 | ||
1517 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1518 | struct mm_struct *mm) | |
1519 | { | |
c69e8d9c | 1520 | const struct cred *cred; |
a84a5059 | 1521 | unsigned int i, len; |
1da177e4 LT |
1522 | |
1523 | /* first copy the parameters from user space */ | |
1524 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1525 | ||
1526 | len = mm->arg_end - mm->arg_start; | |
1527 | if (len >= ELF_PRARGSZ) | |
1528 | len = ELF_PRARGSZ-1; | |
1529 | if (copy_from_user(&psinfo->pr_psargs, | |
1530 | (const char __user *)mm->arg_start, len)) | |
1531 | return -EFAULT; | |
1532 | for(i = 0; i < len; i++) | |
1533 | if (psinfo->pr_psargs[i] == 0) | |
1534 | psinfo->pr_psargs[i] = ' '; | |
1535 | psinfo->pr_psargs[len] = 0; | |
1536 | ||
3b34fc58 ON |
1537 | rcu_read_lock(); |
1538 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1539 | rcu_read_unlock(); | |
b488893a | 1540 | psinfo->pr_pid = task_pid_vnr(p); |
b488893a PE |
1541 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1542 | psinfo->pr_sid = task_session_vnr(p); | |
1da177e4 LT |
1543 | |
1544 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1545 | psinfo->pr_state = i; | |
55148548 | 1546 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1da177e4 LT |
1547 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
1548 | psinfo->pr_nice = task_nice(p); | |
1549 | psinfo->pr_flag = p->flags; | |
c69e8d9c DH |
1550 | rcu_read_lock(); |
1551 | cred = __task_cred(p); | |
ebc887b2 EB |
1552 | SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); |
1553 | SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid)); | |
c69e8d9c | 1554 | rcu_read_unlock(); |
1da177e4 LT |
1555 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1556 | ||
1557 | return 0; | |
1558 | } | |
1559 | ||
3aba481f RM |
1560 | static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm) |
1561 | { | |
1562 | elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv; | |
1563 | int i = 0; | |
1564 | do | |
1565 | i += 2; | |
1566 | while (auxv[i - 2] != AT_NULL); | |
1567 | fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv); | |
1568 | } | |
1569 | ||
49ae4d4b | 1570 | static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata, |
ce395960 | 1571 | const siginfo_t *siginfo) |
49ae4d4b DV |
1572 | { |
1573 | mm_segment_t old_fs = get_fs(); | |
1574 | set_fs(KERNEL_DS); | |
1575 | copy_siginfo_to_user((user_siginfo_t __user *) csigdata, siginfo); | |
1576 | set_fs(old_fs); | |
1577 | fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata); | |
1578 | } | |
1579 | ||
2aa362c4 DV |
1580 | #define MAX_FILE_NOTE_SIZE (4*1024*1024) |
1581 | /* | |
1582 | * Format of NT_FILE note: | |
1583 | * | |
1584 | * long count -- how many files are mapped | |
1585 | * long page_size -- units for file_ofs | |
1586 | * array of [COUNT] elements of | |
1587 | * long start | |
1588 | * long end | |
1589 | * long file_ofs | |
1590 | * followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL... | |
1591 | */ | |
72023656 | 1592 | static int fill_files_note(struct memelfnote *note) |
2aa362c4 DV |
1593 | { |
1594 | struct vm_area_struct *vma; | |
1595 | unsigned count, size, names_ofs, remaining, n; | |
1596 | user_long_t *data; | |
1597 | user_long_t *start_end_ofs; | |
1598 | char *name_base, *name_curpos; | |
1599 | ||
1600 | /* *Estimated* file count and total data size needed */ | |
1601 | count = current->mm->map_count; | |
60c9d92f AD |
1602 | if (count > UINT_MAX / 64) |
1603 | return -EINVAL; | |
2aa362c4 DV |
1604 | size = count * 64; |
1605 | ||
1606 | names_ofs = (2 + 3 * count) * sizeof(data[0]); | |
1607 | alloc: | |
1608 | if (size >= MAX_FILE_NOTE_SIZE) /* paranoia check */ | |
72023656 | 1609 | return -EINVAL; |
2aa362c4 DV |
1610 | size = round_up(size, PAGE_SIZE); |
1611 | data = vmalloc(size); | |
1612 | if (!data) | |
72023656 | 1613 | return -ENOMEM; |
2aa362c4 DV |
1614 | |
1615 | start_end_ofs = data + 2; | |
1616 | name_base = name_curpos = ((char *)data) + names_ofs; | |
1617 | remaining = size - names_ofs; | |
1618 | count = 0; | |
1619 | for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) { | |
1620 | struct file *file; | |
1621 | const char *filename; | |
1622 | ||
1623 | file = vma->vm_file; | |
1624 | if (!file) | |
1625 | continue; | |
9bf39ab2 | 1626 | filename = file_path(file, name_curpos, remaining); |
2aa362c4 DV |
1627 | if (IS_ERR(filename)) { |
1628 | if (PTR_ERR(filename) == -ENAMETOOLONG) { | |
1629 | vfree(data); | |
1630 | size = size * 5 / 4; | |
1631 | goto alloc; | |
1632 | } | |
1633 | continue; | |
1634 | } | |
1635 | ||
9bf39ab2 | 1636 | /* file_path() fills at the end, move name down */ |
2aa362c4 DV |
1637 | /* n = strlen(filename) + 1: */ |
1638 | n = (name_curpos + remaining) - filename; | |
1639 | remaining = filename - name_curpos; | |
1640 | memmove(name_curpos, filename, n); | |
1641 | name_curpos += n; | |
1642 | ||
1643 | *start_end_ofs++ = vma->vm_start; | |
1644 | *start_end_ofs++ = vma->vm_end; | |
1645 | *start_end_ofs++ = vma->vm_pgoff; | |
1646 | count++; | |
1647 | } | |
1648 | ||
1649 | /* Now we know exact count of files, can store it */ | |
1650 | data[0] = count; | |
1651 | data[1] = PAGE_SIZE; | |
1652 | /* | |
1653 | * Count usually is less than current->mm->map_count, | |
1654 | * we need to move filenames down. | |
1655 | */ | |
1656 | n = current->mm->map_count - count; | |
1657 | if (n != 0) { | |
1658 | unsigned shift_bytes = n * 3 * sizeof(data[0]); | |
1659 | memmove(name_base - shift_bytes, name_base, | |
1660 | name_curpos - name_base); | |
1661 | name_curpos -= shift_bytes; | |
1662 | } | |
1663 | ||
1664 | size = name_curpos - (char *)data; | |
1665 | fill_note(note, "CORE", NT_FILE, size, data); | |
72023656 | 1666 | return 0; |
2aa362c4 DV |
1667 | } |
1668 | ||
4206d3aa RM |
1669 | #ifdef CORE_DUMP_USE_REGSET |
1670 | #include <linux/regset.h> | |
1671 | ||
1672 | struct elf_thread_core_info { | |
1673 | struct elf_thread_core_info *next; | |
1674 | struct task_struct *task; | |
1675 | struct elf_prstatus prstatus; | |
1676 | struct memelfnote notes[0]; | |
1677 | }; | |
1678 | ||
1679 | struct elf_note_info { | |
1680 | struct elf_thread_core_info *thread; | |
1681 | struct memelfnote psinfo; | |
49ae4d4b | 1682 | struct memelfnote signote; |
4206d3aa | 1683 | struct memelfnote auxv; |
2aa362c4 | 1684 | struct memelfnote files; |
49ae4d4b | 1685 | user_siginfo_t csigdata; |
4206d3aa RM |
1686 | size_t size; |
1687 | int thread_notes; | |
1688 | }; | |
1689 | ||
d31472b6 RM |
1690 | /* |
1691 | * When a regset has a writeback hook, we call it on each thread before | |
1692 | * dumping user memory. On register window machines, this makes sure the | |
1693 | * user memory backing the register data is up to date before we read it. | |
1694 | */ | |
1695 | static void do_thread_regset_writeback(struct task_struct *task, | |
1696 | const struct user_regset *regset) | |
1697 | { | |
1698 | if (regset->writeback) | |
1699 | regset->writeback(task, regset, 1); | |
1700 | } | |
1701 | ||
0953f65d | 1702 | #ifndef PRSTATUS_SIZE |
90954e7b | 1703 | #define PRSTATUS_SIZE(S, R) sizeof(S) |
0953f65d L |
1704 | #endif |
1705 | ||
1706 | #ifndef SET_PR_FPVALID | |
90954e7b | 1707 | #define SET_PR_FPVALID(S, V, R) ((S)->pr_fpvalid = (V)) |
0953f65d L |
1708 | #endif |
1709 | ||
4206d3aa RM |
1710 | static int fill_thread_core_info(struct elf_thread_core_info *t, |
1711 | const struct user_regset_view *view, | |
1712 | long signr, size_t *total) | |
1713 | { | |
1714 | unsigned int i; | |
27e64b4b | 1715 | unsigned int regset0_size = regset_size(t->task, &view->regsets[0]); |
4206d3aa RM |
1716 | |
1717 | /* | |
1718 | * NT_PRSTATUS is the one special case, because the regset data | |
1719 | * goes into the pr_reg field inside the note contents, rather | |
1720 | * than being the whole note contents. We fill the reset in here. | |
1721 | * We assume that regset 0 is NT_PRSTATUS. | |
1722 | */ | |
1723 | fill_prstatus(&t->prstatus, t->task, signr); | |
27e64b4b | 1724 | (void) view->regsets[0].get(t->task, &view->regsets[0], 0, regset0_size, |
90954e7b | 1725 | &t->prstatus.pr_reg, NULL); |
4206d3aa RM |
1726 | |
1727 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, | |
27e64b4b | 1728 | PRSTATUS_SIZE(t->prstatus, regset0_size), &t->prstatus); |
4206d3aa RM |
1729 | *total += notesize(&t->notes[0]); |
1730 | ||
d31472b6 RM |
1731 | do_thread_regset_writeback(t->task, &view->regsets[0]); |
1732 | ||
4206d3aa RM |
1733 | /* |
1734 | * Each other regset might generate a note too. For each regset | |
1735 | * that has no core_note_type or is inactive, we leave t->notes[i] | |
1736 | * all zero and we'll know to skip writing it later. | |
1737 | */ | |
1738 | for (i = 1; i < view->n; ++i) { | |
1739 | const struct user_regset *regset = &view->regsets[i]; | |
d31472b6 | 1740 | do_thread_regset_writeback(t->task, regset); |
c8e25258 | 1741 | if (regset->core_note_type && regset->get && |
4206d3aa RM |
1742 | (!regset->active || regset->active(t->task, regset))) { |
1743 | int ret; | |
27e64b4b | 1744 | size_t size = regset_size(t->task, regset); |
4206d3aa RM |
1745 | void *data = kmalloc(size, GFP_KERNEL); |
1746 | if (unlikely(!data)) | |
1747 | return 0; | |
1748 | ret = regset->get(t->task, regset, | |
1749 | 0, size, data, NULL); | |
1750 | if (unlikely(ret)) | |
1751 | kfree(data); | |
1752 | else { | |
1753 | if (regset->core_note_type != NT_PRFPREG) | |
1754 | fill_note(&t->notes[i], "LINUX", | |
1755 | regset->core_note_type, | |
1756 | size, data); | |
1757 | else { | |
90954e7b | 1758 | SET_PR_FPVALID(&t->prstatus, |
27e64b4b | 1759 | 1, regset0_size); |
4206d3aa RM |
1760 | fill_note(&t->notes[i], "CORE", |
1761 | NT_PRFPREG, size, data); | |
1762 | } | |
1763 | *total += notesize(&t->notes[i]); | |
1764 | } | |
1765 | } | |
1766 | } | |
1767 | ||
1768 | return 1; | |
1769 | } | |
1770 | ||
1771 | static int fill_note_info(struct elfhdr *elf, int phdrs, | |
1772 | struct elf_note_info *info, | |
ec57941e | 1773 | const siginfo_t *siginfo, struct pt_regs *regs) |
4206d3aa RM |
1774 | { |
1775 | struct task_struct *dump_task = current; | |
1776 | const struct user_regset_view *view = task_user_regset_view(dump_task); | |
1777 | struct elf_thread_core_info *t; | |
1778 | struct elf_prpsinfo *psinfo; | |
83914441 | 1779 | struct core_thread *ct; |
4206d3aa RM |
1780 | unsigned int i; |
1781 | ||
1782 | info->size = 0; | |
1783 | info->thread = NULL; | |
1784 | ||
1785 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
6899e92d AC |
1786 | if (psinfo == NULL) { |
1787 | info->psinfo.data = NULL; /* So we don't free this wrongly */ | |
4206d3aa | 1788 | return 0; |
6899e92d | 1789 | } |
4206d3aa | 1790 | |
e2dbe125 AW |
1791 | fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
1792 | ||
4206d3aa RM |
1793 | /* |
1794 | * Figure out how many notes we're going to need for each thread. | |
1795 | */ | |
1796 | info->thread_notes = 0; | |
1797 | for (i = 0; i < view->n; ++i) | |
1798 | if (view->regsets[i].core_note_type != 0) | |
1799 | ++info->thread_notes; | |
1800 | ||
1801 | /* | |
1802 | * Sanity check. We rely on regset 0 being in NT_PRSTATUS, | |
1803 | * since it is our one special case. | |
1804 | */ | |
1805 | if (unlikely(info->thread_notes == 0) || | |
1806 | unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) { | |
1807 | WARN_ON(1); | |
1808 | return 0; | |
1809 | } | |
1810 | ||
1811 | /* | |
1812 | * Initialize the ELF file header. | |
1813 | */ | |
1814 | fill_elf_header(elf, phdrs, | |
d3330cf0 | 1815 | view->e_machine, view->e_flags); |
4206d3aa RM |
1816 | |
1817 | /* | |
1818 | * Allocate a structure for each thread. | |
1819 | */ | |
83914441 ON |
1820 | for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) { |
1821 | t = kzalloc(offsetof(struct elf_thread_core_info, | |
1822 | notes[info->thread_notes]), | |
1823 | GFP_KERNEL); | |
1824 | if (unlikely(!t)) | |
1825 | return 0; | |
1826 | ||
1827 | t->task = ct->task; | |
1828 | if (ct->task == dump_task || !info->thread) { | |
1829 | t->next = info->thread; | |
1830 | info->thread = t; | |
1831 | } else { | |
1832 | /* | |
1833 | * Make sure to keep the original task at | |
1834 | * the head of the list. | |
1835 | */ | |
1836 | t->next = info->thread->next; | |
1837 | info->thread->next = t; | |
4206d3aa | 1838 | } |
83914441 | 1839 | } |
4206d3aa RM |
1840 | |
1841 | /* | |
1842 | * Now fill in each thread's information. | |
1843 | */ | |
1844 | for (t = info->thread; t != NULL; t = t->next) | |
5ab1c309 | 1845 | if (!fill_thread_core_info(t, view, siginfo->si_signo, &info->size)) |
4206d3aa RM |
1846 | return 0; |
1847 | ||
1848 | /* | |
1849 | * Fill in the two process-wide notes. | |
1850 | */ | |
1851 | fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm); | |
1852 | info->size += notesize(&info->psinfo); | |
1853 | ||
49ae4d4b DV |
1854 | fill_siginfo_note(&info->signote, &info->csigdata, siginfo); |
1855 | info->size += notesize(&info->signote); | |
1856 | ||
4206d3aa RM |
1857 | fill_auxv_note(&info->auxv, current->mm); |
1858 | info->size += notesize(&info->auxv); | |
1859 | ||
72023656 DA |
1860 | if (fill_files_note(&info->files) == 0) |
1861 | info->size += notesize(&info->files); | |
2aa362c4 | 1862 | |
4206d3aa RM |
1863 | return 1; |
1864 | } | |
1865 | ||
1866 | static size_t get_note_info_size(struct elf_note_info *info) | |
1867 | { | |
1868 | return info->size; | |
1869 | } | |
1870 | ||
1871 | /* | |
1872 | * Write all the notes for each thread. When writing the first thread, the | |
1873 | * process-wide notes are interleaved after the first thread-specific note. | |
1874 | */ | |
1875 | static int write_note_info(struct elf_note_info *info, | |
ecc8c772 | 1876 | struct coredump_params *cprm) |
4206d3aa | 1877 | { |
b219e25f | 1878 | bool first = true; |
4206d3aa RM |
1879 | struct elf_thread_core_info *t = info->thread; |
1880 | ||
1881 | do { | |
1882 | int i; | |
1883 | ||
ecc8c772 | 1884 | if (!writenote(&t->notes[0], cprm)) |
4206d3aa RM |
1885 | return 0; |
1886 | ||
ecc8c772 | 1887 | if (first && !writenote(&info->psinfo, cprm)) |
4206d3aa | 1888 | return 0; |
ecc8c772 | 1889 | if (first && !writenote(&info->signote, cprm)) |
49ae4d4b | 1890 | return 0; |
ecc8c772 | 1891 | if (first && !writenote(&info->auxv, cprm)) |
4206d3aa | 1892 | return 0; |
72023656 | 1893 | if (first && info->files.data && |
ecc8c772 | 1894 | !writenote(&info->files, cprm)) |
2aa362c4 | 1895 | return 0; |
4206d3aa RM |
1896 | |
1897 | for (i = 1; i < info->thread_notes; ++i) | |
1898 | if (t->notes[i].data && | |
ecc8c772 | 1899 | !writenote(&t->notes[i], cprm)) |
4206d3aa RM |
1900 | return 0; |
1901 | ||
b219e25f | 1902 | first = false; |
4206d3aa RM |
1903 | t = t->next; |
1904 | } while (t); | |
1905 | ||
1906 | return 1; | |
1907 | } | |
1908 | ||
1909 | static void free_note_info(struct elf_note_info *info) | |
1910 | { | |
1911 | struct elf_thread_core_info *threads = info->thread; | |
1912 | while (threads) { | |
1913 | unsigned int i; | |
1914 | struct elf_thread_core_info *t = threads; | |
1915 | threads = t->next; | |
1916 | WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus); | |
1917 | for (i = 1; i < info->thread_notes; ++i) | |
1918 | kfree(t->notes[i].data); | |
1919 | kfree(t); | |
1920 | } | |
1921 | kfree(info->psinfo.data); | |
2aa362c4 | 1922 | vfree(info->files.data); |
4206d3aa RM |
1923 | } |
1924 | ||
1925 | #else | |
1926 | ||
1da177e4 LT |
1927 | /* Here is the structure in which status of each thread is captured. */ |
1928 | struct elf_thread_status | |
1929 | { | |
1930 | struct list_head list; | |
1931 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1932 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1933 | struct task_struct *thread; | |
1934 | #ifdef ELF_CORE_COPY_XFPREGS | |
5b20cd80 | 1935 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
1da177e4 LT |
1936 | #endif |
1937 | struct memelfnote notes[3]; | |
1938 | int num_notes; | |
1939 | }; | |
1940 | ||
1941 | /* | |
1942 | * In order to add the specific thread information for the elf file format, | |
f4e5cc2c JJ |
1943 | * we need to keep a linked list of every threads pr_status and then create |
1944 | * a single section for them in the final core file. | |
1da177e4 LT |
1945 | */ |
1946 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1947 | { | |
1948 | int sz = 0; | |
1949 | struct task_struct *p = t->thread; | |
1950 | t->num_notes = 0; | |
1951 | ||
1952 | fill_prstatus(&t->prstatus, p, signr); | |
1953 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1954 | ||
f4e5cc2c JJ |
1955 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
1956 | &(t->prstatus)); | |
1da177e4 LT |
1957 | t->num_notes++; |
1958 | sz += notesize(&t->notes[0]); | |
1959 | ||
f4e5cc2c JJ |
1960 | if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, |
1961 | &t->fpu))) { | |
1962 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1963 | &(t->fpu)); | |
1da177e4 LT |
1964 | t->num_notes++; |
1965 | sz += notesize(&t->notes[1]); | |
1966 | } | |
1967 | ||
1968 | #ifdef ELF_CORE_COPY_XFPREGS | |
1969 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
5b20cd80 MN |
1970 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1971 | sizeof(t->xfpu), &t->xfpu); | |
1da177e4 LT |
1972 | t->num_notes++; |
1973 | sz += notesize(&t->notes[2]); | |
1974 | } | |
1975 | #endif | |
1976 | return sz; | |
1977 | } | |
1978 | ||
3aba481f RM |
1979 | struct elf_note_info { |
1980 | struct memelfnote *notes; | |
72023656 | 1981 | struct memelfnote *notes_files; |
3aba481f RM |
1982 | struct elf_prstatus *prstatus; /* NT_PRSTATUS */ |
1983 | struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */ | |
1984 | struct list_head thread_list; | |
1985 | elf_fpregset_t *fpu; | |
1986 | #ifdef ELF_CORE_COPY_XFPREGS | |
1987 | elf_fpxregset_t *xfpu; | |
1988 | #endif | |
49ae4d4b | 1989 | user_siginfo_t csigdata; |
3aba481f RM |
1990 | int thread_status_size; |
1991 | int numnote; | |
1992 | }; | |
1993 | ||
0cf062d0 | 1994 | static int elf_note_info_init(struct elf_note_info *info) |
3aba481f | 1995 | { |
0cf062d0 | 1996 | memset(info, 0, sizeof(*info)); |
3aba481f RM |
1997 | INIT_LIST_HEAD(&info->thread_list); |
1998 | ||
49ae4d4b | 1999 | /* Allocate space for ELF notes */ |
2aa362c4 | 2000 | info->notes = kmalloc(8 * sizeof(struct memelfnote), GFP_KERNEL); |
3aba481f RM |
2001 | if (!info->notes) |
2002 | return 0; | |
2003 | info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL); | |
2004 | if (!info->psinfo) | |
f34f9d18 | 2005 | return 0; |
3aba481f RM |
2006 | info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL); |
2007 | if (!info->prstatus) | |
f34f9d18 | 2008 | return 0; |
3aba481f RM |
2009 | info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL); |
2010 | if (!info->fpu) | |
f34f9d18 | 2011 | return 0; |
3aba481f RM |
2012 | #ifdef ELF_CORE_COPY_XFPREGS |
2013 | info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL); | |
2014 | if (!info->xfpu) | |
f34f9d18 | 2015 | return 0; |
3aba481f | 2016 | #endif |
0cf062d0 | 2017 | return 1; |
0cf062d0 AW |
2018 | } |
2019 | ||
2020 | static int fill_note_info(struct elfhdr *elf, int phdrs, | |
2021 | struct elf_note_info *info, | |
ec57941e | 2022 | const siginfo_t *siginfo, struct pt_regs *regs) |
0cf062d0 AW |
2023 | { |
2024 | struct list_head *t; | |
afabada9 AV |
2025 | struct core_thread *ct; |
2026 | struct elf_thread_status *ets; | |
0cf062d0 AW |
2027 | |
2028 | if (!elf_note_info_init(info)) | |
2029 | return 0; | |
3aba481f | 2030 | |
afabada9 AV |
2031 | for (ct = current->mm->core_state->dumper.next; |
2032 | ct; ct = ct->next) { | |
2033 | ets = kzalloc(sizeof(*ets), GFP_KERNEL); | |
2034 | if (!ets) | |
2035 | return 0; | |
83914441 | 2036 | |
afabada9 AV |
2037 | ets->thread = ct->task; |
2038 | list_add(&ets->list, &info->thread_list); | |
2039 | } | |
83914441 | 2040 | |
afabada9 AV |
2041 | list_for_each(t, &info->thread_list) { |
2042 | int sz; | |
3aba481f | 2043 | |
afabada9 AV |
2044 | ets = list_entry(t, struct elf_thread_status, list); |
2045 | sz = elf_dump_thread_status(siginfo->si_signo, ets); | |
2046 | info->thread_status_size += sz; | |
3aba481f RM |
2047 | } |
2048 | /* now collect the dump for the current */ | |
2049 | memset(info->prstatus, 0, sizeof(*info->prstatus)); | |
5ab1c309 | 2050 | fill_prstatus(info->prstatus, current, siginfo->si_signo); |
3aba481f RM |
2051 | elf_core_copy_regs(&info->prstatus->pr_reg, regs); |
2052 | ||
2053 | /* Set up header */ | |
d3330cf0 | 2054 | fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS); |
3aba481f RM |
2055 | |
2056 | /* | |
2057 | * Set up the notes in similar form to SVR4 core dumps made | |
2058 | * with info from their /proc. | |
2059 | */ | |
2060 | ||
2061 | fill_note(info->notes + 0, "CORE", NT_PRSTATUS, | |
2062 | sizeof(*info->prstatus), info->prstatus); | |
2063 | fill_psinfo(info->psinfo, current->group_leader, current->mm); | |
2064 | fill_note(info->notes + 1, "CORE", NT_PRPSINFO, | |
2065 | sizeof(*info->psinfo), info->psinfo); | |
2066 | ||
2aa362c4 DV |
2067 | fill_siginfo_note(info->notes + 2, &info->csigdata, siginfo); |
2068 | fill_auxv_note(info->notes + 3, current->mm); | |
72023656 | 2069 | info->numnote = 4; |
3aba481f | 2070 | |
72023656 DA |
2071 | if (fill_files_note(info->notes + info->numnote) == 0) { |
2072 | info->notes_files = info->notes + info->numnote; | |
2073 | info->numnote++; | |
2074 | } | |
3aba481f RM |
2075 | |
2076 | /* Try to dump the FPU. */ | |
2077 | info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs, | |
2078 | info->fpu); | |
2079 | if (info->prstatus->pr_fpvalid) | |
2080 | fill_note(info->notes + info->numnote++, | |
2081 | "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu); | |
2082 | #ifdef ELF_CORE_COPY_XFPREGS | |
2083 | if (elf_core_copy_task_xfpregs(current, info->xfpu)) | |
2084 | fill_note(info->notes + info->numnote++, | |
2085 | "LINUX", ELF_CORE_XFPREG_TYPE, | |
2086 | sizeof(*info->xfpu), info->xfpu); | |
2087 | #endif | |
2088 | ||
2089 | return 1; | |
3aba481f RM |
2090 | } |
2091 | ||
2092 | static size_t get_note_info_size(struct elf_note_info *info) | |
2093 | { | |
2094 | int sz = 0; | |
2095 | int i; | |
2096 | ||
2097 | for (i = 0; i < info->numnote; i++) | |
2098 | sz += notesize(info->notes + i); | |
2099 | ||
2100 | sz += info->thread_status_size; | |
2101 | ||
2102 | return sz; | |
2103 | } | |
2104 | ||
2105 | static int write_note_info(struct elf_note_info *info, | |
ecc8c772 | 2106 | struct coredump_params *cprm) |
3aba481f RM |
2107 | { |
2108 | int i; | |
2109 | struct list_head *t; | |
2110 | ||
2111 | for (i = 0; i < info->numnote; i++) | |
ecc8c772 | 2112 | if (!writenote(info->notes + i, cprm)) |
3aba481f RM |
2113 | return 0; |
2114 | ||
2115 | /* write out the thread status notes section */ | |
2116 | list_for_each(t, &info->thread_list) { | |
2117 | struct elf_thread_status *tmp = | |
2118 | list_entry(t, struct elf_thread_status, list); | |
2119 | ||
2120 | for (i = 0; i < tmp->num_notes; i++) | |
ecc8c772 | 2121 | if (!writenote(&tmp->notes[i], cprm)) |
3aba481f RM |
2122 | return 0; |
2123 | } | |
2124 | ||
2125 | return 1; | |
2126 | } | |
2127 | ||
2128 | static void free_note_info(struct elf_note_info *info) | |
2129 | { | |
2130 | while (!list_empty(&info->thread_list)) { | |
2131 | struct list_head *tmp = info->thread_list.next; | |
2132 | list_del(tmp); | |
2133 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
2134 | } | |
2135 | ||
72023656 DA |
2136 | /* Free data possibly allocated by fill_files_note(): */ |
2137 | if (info->notes_files) | |
2138 | vfree(info->notes_files->data); | |
2aa362c4 | 2139 | |
3aba481f RM |
2140 | kfree(info->prstatus); |
2141 | kfree(info->psinfo); | |
2142 | kfree(info->notes); | |
2143 | kfree(info->fpu); | |
2144 | #ifdef ELF_CORE_COPY_XFPREGS | |
2145 | kfree(info->xfpu); | |
2146 | #endif | |
2147 | } | |
2148 | ||
4206d3aa RM |
2149 | #endif |
2150 | ||
f47aef55 RM |
2151 | static struct vm_area_struct *first_vma(struct task_struct *tsk, |
2152 | struct vm_area_struct *gate_vma) | |
2153 | { | |
2154 | struct vm_area_struct *ret = tsk->mm->mmap; | |
2155 | ||
2156 | if (ret) | |
2157 | return ret; | |
2158 | return gate_vma; | |
2159 | } | |
2160 | /* | |
2161 | * Helper function for iterating across a vma list. It ensures that the caller | |
2162 | * will visit `gate_vma' prior to terminating the search. | |
2163 | */ | |
2164 | static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma, | |
2165 | struct vm_area_struct *gate_vma) | |
2166 | { | |
2167 | struct vm_area_struct *ret; | |
2168 | ||
2169 | ret = this_vma->vm_next; | |
2170 | if (ret) | |
2171 | return ret; | |
2172 | if (this_vma == gate_vma) | |
2173 | return NULL; | |
2174 | return gate_vma; | |
2175 | } | |
2176 | ||
8d9032bb DH |
2177 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
2178 | elf_addr_t e_shoff, int segs) | |
2179 | { | |
2180 | elf->e_shoff = e_shoff; | |
2181 | elf->e_shentsize = sizeof(*shdr4extnum); | |
2182 | elf->e_shnum = 1; | |
2183 | elf->e_shstrndx = SHN_UNDEF; | |
2184 | ||
2185 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); | |
2186 | ||
2187 | shdr4extnum->sh_type = SHT_NULL; | |
2188 | shdr4extnum->sh_size = elf->e_shnum; | |
2189 | shdr4extnum->sh_link = elf->e_shstrndx; | |
2190 | shdr4extnum->sh_info = segs; | |
2191 | } | |
2192 | ||
1da177e4 LT |
2193 | /* |
2194 | * Actual dumper | |
2195 | * | |
2196 | * This is a two-pass process; first we find the offsets of the bits, | |
2197 | * and then they are actually written out. If we run out of core limit | |
2198 | * we just truncate. | |
2199 | */ | |
f6151dfe | 2200 | static int elf_core_dump(struct coredump_params *cprm) |
1da177e4 | 2201 | { |
1da177e4 LT |
2202 | int has_dumped = 0; |
2203 | mm_segment_t fs; | |
52f5592e JL |
2204 | int segs, i; |
2205 | size_t vma_data_size = 0; | |
f47aef55 | 2206 | struct vm_area_struct *vma, *gate_vma; |
1da177e4 | 2207 | struct elfhdr *elf = NULL; |
cdc3d562 | 2208 | loff_t offset = 0, dataoff; |
72023656 | 2209 | struct elf_note_info info = { }; |
93eb211e | 2210 | struct elf_phdr *phdr4note = NULL; |
8d9032bb DH |
2211 | struct elf_shdr *shdr4extnum = NULL; |
2212 | Elf_Half e_phnum; | |
2213 | elf_addr_t e_shoff; | |
52f5592e | 2214 | elf_addr_t *vma_filesz = NULL; |
1da177e4 LT |
2215 | |
2216 | /* | |
2217 | * We no longer stop all VM operations. | |
2218 | * | |
f4e5cc2c JJ |
2219 | * This is because those proceses that could possibly change map_count |
2220 | * or the mmap / vma pages are now blocked in do_exit on current | |
2221 | * finishing this core dump. | |
1da177e4 LT |
2222 | * |
2223 | * Only ptrace can touch these memory addresses, but it doesn't change | |
f4e5cc2c | 2224 | * the map_count or the pages allocated. So no possibility of crashing |
1da177e4 LT |
2225 | * exists while dumping the mm->vm_next areas to the core file. |
2226 | */ | |
2227 | ||
2228 | /* alloc memory for large data structures: too large to be on stack */ | |
2229 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
2230 | if (!elf) | |
5f719558 | 2231 | goto out; |
341c87bf KH |
2232 | /* |
2233 | * The number of segs are recored into ELF header as 16bit value. | |
2234 | * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here. | |
2235 | */ | |
1da177e4 | 2236 | segs = current->mm->map_count; |
1fcccbac | 2237 | segs += elf_core_extra_phdrs(); |
1da177e4 | 2238 | |
31db58b3 | 2239 | gate_vma = get_gate_vma(current->mm); |
f47aef55 RM |
2240 | if (gate_vma != NULL) |
2241 | segs++; | |
2242 | ||
8d9032bb DH |
2243 | /* for notes section */ |
2244 | segs++; | |
2245 | ||
2246 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid | |
2247 | * this, kernel supports extended numbering. Have a look at | |
2248 | * include/linux/elf.h for further information. */ | |
2249 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; | |
2250 | ||
1da177e4 | 2251 | /* |
3aba481f RM |
2252 | * Collect all the non-memory information about the process for the |
2253 | * notes. This also sets up the file header. | |
1da177e4 | 2254 | */ |
5ab1c309 | 2255 | if (!fill_note_info(elf, e_phnum, &info, cprm->siginfo, cprm->regs)) |
3aba481f | 2256 | goto cleanup; |
1da177e4 | 2257 | |
3aba481f | 2258 | has_dumped = 1; |
079148b9 | 2259 | |
1da177e4 LT |
2260 | fs = get_fs(); |
2261 | set_fs(KERNEL_DS); | |
2262 | ||
1da177e4 | 2263 | offset += sizeof(*elf); /* Elf header */ |
8d9032bb | 2264 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
1da177e4 LT |
2265 | |
2266 | /* Write notes phdr entry */ | |
2267 | { | |
3aba481f | 2268 | size_t sz = get_note_info_size(&info); |
1da177e4 | 2269 | |
e5501492 | 2270 | sz += elf_coredump_extra_notes_size(); |
bf1ab978 | 2271 | |
93eb211e DH |
2272 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
2273 | if (!phdr4note) | |
088e7af7 | 2274 | goto end_coredump; |
93eb211e DH |
2275 | |
2276 | fill_elf_note_phdr(phdr4note, sz, offset); | |
2277 | offset += sz; | |
1da177e4 LT |
2278 | } |
2279 | ||
1da177e4 LT |
2280 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
2281 | ||
30f74aa0 JB |
2282 | if (segs - 1 > ULONG_MAX / sizeof(*vma_filesz)) |
2283 | goto end_coredump; | |
2284 | vma_filesz = vmalloc((segs - 1) * sizeof(*vma_filesz)); | |
52f5592e JL |
2285 | if (!vma_filesz) |
2286 | goto end_coredump; | |
2287 | ||
2288 | for (i = 0, vma = first_vma(current, gate_vma); vma != NULL; | |
2289 | vma = next_vma(vma, gate_vma)) { | |
2290 | unsigned long dump_size; | |
2291 | ||
2292 | dump_size = vma_dump_size(vma, cprm->mm_flags); | |
2293 | vma_filesz[i++] = dump_size; | |
2294 | vma_data_size += dump_size; | |
2295 | } | |
2296 | ||
2297 | offset += vma_data_size; | |
8d9032bb DH |
2298 | offset += elf_core_extra_data_size(); |
2299 | e_shoff = offset; | |
2300 | ||
2301 | if (e_phnum == PN_XNUM) { | |
2302 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); | |
2303 | if (!shdr4extnum) | |
2304 | goto end_coredump; | |
2305 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs); | |
2306 | } | |
2307 | ||
2308 | offset = dataoff; | |
2309 | ||
ecc8c772 | 2310 | if (!dump_emit(cprm, elf, sizeof(*elf))) |
93eb211e DH |
2311 | goto end_coredump; |
2312 | ||
ecc8c772 | 2313 | if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) |
93eb211e DH |
2314 | goto end_coredump; |
2315 | ||
1da177e4 | 2316 | /* Write program headers for segments dump */ |
52f5592e | 2317 | for (i = 0, vma = first_vma(current, gate_vma); vma != NULL; |
f47aef55 | 2318 | vma = next_vma(vma, gate_vma)) { |
1da177e4 | 2319 | struct elf_phdr phdr; |
1da177e4 LT |
2320 | |
2321 | phdr.p_type = PT_LOAD; | |
2322 | phdr.p_offset = offset; | |
2323 | phdr.p_vaddr = vma->vm_start; | |
2324 | phdr.p_paddr = 0; | |
52f5592e | 2325 | phdr.p_filesz = vma_filesz[i++]; |
82df3973 | 2326 | phdr.p_memsz = vma->vm_end - vma->vm_start; |
1da177e4 LT |
2327 | offset += phdr.p_filesz; |
2328 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
f4e5cc2c JJ |
2329 | if (vma->vm_flags & VM_WRITE) |
2330 | phdr.p_flags |= PF_W; | |
2331 | if (vma->vm_flags & VM_EXEC) | |
2332 | phdr.p_flags |= PF_X; | |
1da177e4 LT |
2333 | phdr.p_align = ELF_EXEC_PAGESIZE; |
2334 | ||
ecc8c772 | 2335 | if (!dump_emit(cprm, &phdr, sizeof(phdr))) |
088e7af7 | 2336 | goto end_coredump; |
1da177e4 LT |
2337 | } |
2338 | ||
506f21c5 | 2339 | if (!elf_core_write_extra_phdrs(cprm, offset)) |
1fcccbac | 2340 | goto end_coredump; |
1da177e4 LT |
2341 | |
2342 | /* write out the notes section */ | |
ecc8c772 | 2343 | if (!write_note_info(&info, cprm)) |
3aba481f | 2344 | goto end_coredump; |
1da177e4 | 2345 | |
cdc3d562 | 2346 | if (elf_coredump_extra_notes_write(cprm)) |
e5501492 | 2347 | goto end_coredump; |
bf1ab978 | 2348 | |
d025c9db | 2349 | /* Align to page */ |
1607f09c | 2350 | if (!dump_skip(cprm, dataoff - cprm->pos)) |
f3e8fccd | 2351 | goto end_coredump; |
1da177e4 | 2352 | |
52f5592e | 2353 | for (i = 0, vma = first_vma(current, gate_vma); vma != NULL; |
f47aef55 | 2354 | vma = next_vma(vma, gate_vma)) { |
1da177e4 | 2355 | unsigned long addr; |
82df3973 | 2356 | unsigned long end; |
1da177e4 | 2357 | |
52f5592e | 2358 | end = vma->vm_start + vma_filesz[i++]; |
1da177e4 | 2359 | |
82df3973 | 2360 | for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) { |
f4e5cc2c | 2361 | struct page *page; |
f3e8fccd HD |
2362 | int stop; |
2363 | ||
2364 | page = get_dump_page(addr); | |
2365 | if (page) { | |
2366 | void *kaddr = kmap(page); | |
13046ece | 2367 | stop = !dump_emit(cprm, kaddr, PAGE_SIZE); |
f3e8fccd | 2368 | kunmap(page); |
09cbfeaf | 2369 | put_page(page); |
f3e8fccd | 2370 | } else |
9b56d543 | 2371 | stop = !dump_skip(cprm, PAGE_SIZE); |
f3e8fccd HD |
2372 | if (stop) |
2373 | goto end_coredump; | |
1da177e4 LT |
2374 | } |
2375 | } | |
4d22c75d | 2376 | dump_truncate(cprm); |
1da177e4 | 2377 | |
aa3e7eaf | 2378 | if (!elf_core_write_extra_data(cprm)) |
1fcccbac | 2379 | goto end_coredump; |
1da177e4 | 2380 | |
8d9032bb | 2381 | if (e_phnum == PN_XNUM) { |
13046ece | 2382 | if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) |
8d9032bb DH |
2383 | goto end_coredump; |
2384 | } | |
2385 | ||
1da177e4 LT |
2386 | end_coredump: |
2387 | set_fs(fs); | |
2388 | ||
2389 | cleanup: | |
3aba481f | 2390 | free_note_info(&info); |
8d9032bb | 2391 | kfree(shdr4extnum); |
30f74aa0 | 2392 | vfree(vma_filesz); |
93eb211e | 2393 | kfree(phdr4note); |
5f719558 WC |
2394 | kfree(elf); |
2395 | out: | |
1da177e4 | 2396 | return has_dumped; |
1da177e4 LT |
2397 | } |
2398 | ||
698ba7b5 | 2399 | #endif /* CONFIG_ELF_CORE */ |
1da177e4 LT |
2400 | |
2401 | static int __init init_elf_binfmt(void) | |
2402 | { | |
8fc3dc5a AV |
2403 | register_binfmt(&elf_format); |
2404 | return 0; | |
1da177e4 LT |
2405 | } |
2406 | ||
2407 | static void __exit exit_elf_binfmt(void) | |
2408 | { | |
2409 | /* Remove the COFF and ELF loaders. */ | |
2410 | unregister_binfmt(&elf_format); | |
2411 | } | |
2412 | ||
2413 | core_initcall(init_elf_binfmt); | |
2414 | module_exit(exit_elf_binfmt); | |
2415 | MODULE_LICENSE("GPL"); |