Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/fs/binfmt_elf.c | |
4 | * | |
5 | * These are the functions used to load ELF format executables as used | |
6 | * on SVr4 machines. Information on the format may be found in the book | |
7 | * "UNIX SYSTEM V RELEASE 4 Programmers Guide: Ansi C and Programming Support | |
8 | * Tools". | |
9 | * | |
10 | * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com). | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/fs.h> | |
ce81bb25 | 16 | #include <linux/log2.h> |
1da177e4 LT |
17 | #include <linux/mm.h> |
18 | #include <linux/mman.h> | |
1da177e4 LT |
19 | #include <linux/errno.h> |
20 | #include <linux/signal.h> | |
21 | #include <linux/binfmts.h> | |
22 | #include <linux/string.h> | |
23 | #include <linux/file.h> | |
1da177e4 | 24 | #include <linux/slab.h> |
1da177e4 LT |
25 | #include <linux/personality.h> |
26 | #include <linux/elfcore.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/highuid.h> | |
1da177e4 LT |
29 | #include <linux/compiler.h> |
30 | #include <linux/highmem.h> | |
03911132 | 31 | #include <linux/hugetlb.h> |
1da177e4 | 32 | #include <linux/pagemap.h> |
2aa362c4 | 33 | #include <linux/vmalloc.h> |
1da177e4 | 34 | #include <linux/security.h> |
1da177e4 | 35 | #include <linux/random.h> |
f4e5cc2c | 36 | #include <linux/elf.h> |
d1fd836d | 37 | #include <linux/elf-randomize.h> |
7e80d0d0 | 38 | #include <linux/utsname.h> |
088e7af7 | 39 | #include <linux/coredump.h> |
6fac4829 | 40 | #include <linux/sched.h> |
f7ccbae4 | 41 | #include <linux/sched/coredump.h> |
68db0cf1 | 42 | #include <linux/sched/task_stack.h> |
32ef5517 | 43 | #include <linux/sched/cputime.h> |
00e19cee DM |
44 | #include <linux/sizes.h> |
45 | #include <linux/types.h> | |
5b825c3a | 46 | #include <linux/cred.h> |
5037835c | 47 | #include <linux/dax.h> |
7c0f6ba6 | 48 | #include <linux/uaccess.h> |
1da177e4 LT |
49 | #include <asm/param.h> |
50 | #include <asm/page.h> | |
51 | ||
00e19cee DM |
52 | #ifndef ELF_COMPAT |
53 | #define ELF_COMPAT 0 | |
54 | #endif | |
55 | ||
2aa362c4 DV |
56 | #ifndef user_long_t |
57 | #define user_long_t long | |
58 | #endif | |
49ae4d4b DV |
59 | #ifndef user_siginfo_t |
60 | #define user_siginfo_t siginfo_t | |
61 | #endif | |
62 | ||
4755200b NP |
63 | /* That's for binfmt_elf_fdpic to deal with */ |
64 | #ifndef elf_check_fdpic | |
65 | #define elf_check_fdpic(ex) false | |
66 | #endif | |
67 | ||
71613c3b | 68 | static int load_elf_binary(struct linux_binprm *bprm); |
1da177e4 | 69 | |
69369a70 JT |
70 | #ifdef CONFIG_USELIB |
71 | static int load_elf_library(struct file *); | |
72 | #else | |
73 | #define load_elf_library NULL | |
74 | #endif | |
75 | ||
1da177e4 LT |
76 | /* |
77 | * If we don't support core dumping, then supply a NULL so we | |
78 | * don't even try. | |
79 | */ | |
698ba7b5 | 80 | #ifdef CONFIG_ELF_CORE |
f6151dfe | 81 | static int elf_core_dump(struct coredump_params *cprm); |
1da177e4 LT |
82 | #else |
83 | #define elf_core_dump NULL | |
84 | #endif | |
85 | ||
86 | #if ELF_EXEC_PAGESIZE > PAGE_SIZE | |
f4e5cc2c | 87 | #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE |
1da177e4 | 88 | #else |
f4e5cc2c | 89 | #define ELF_MIN_ALIGN PAGE_SIZE |
1da177e4 LT |
90 | #endif |
91 | ||
92 | #ifndef ELF_CORE_EFLAGS | |
93 | #define ELF_CORE_EFLAGS 0 | |
94 | #endif | |
95 | ||
10b19249 | 96 | #define ELF_PAGESTART(_v) ((_v) & ~(int)(ELF_MIN_ALIGN-1)) |
1da177e4 LT |
97 | #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1)) |
98 | #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1)) | |
99 | ||
100 | static struct linux_binfmt elf_format = { | |
f670d0ec MP |
101 | .module = THIS_MODULE, |
102 | .load_binary = load_elf_binary, | |
103 | .load_shlib = load_elf_library, | |
d65bc29b | 104 | #ifdef CONFIG_COREDUMP |
f670d0ec MP |
105 | .core_dump = elf_core_dump, |
106 | .min_coredump = ELF_EXEC_PAGESIZE, | |
d65bc29b | 107 | #endif |
1da177e4 LT |
108 | }; |
109 | ||
18676ffc | 110 | #define BAD_ADDR(x) (unlikely((unsigned long)(x) >= TASK_SIZE)) |
1da177e4 | 111 | |
16e72e9b | 112 | static int set_brk(unsigned long start, unsigned long end, int prot) |
1da177e4 LT |
113 | { |
114 | start = ELF_PAGEALIGN(start); | |
115 | end = ELF_PAGEALIGN(end); | |
116 | if (end > start) { | |
16e72e9b DV |
117 | /* |
118 | * Map the last of the bss segment. | |
119 | * If the header is requesting these pages to be | |
120 | * executable, honour that (ppc32 needs this). | |
121 | */ | |
122 | int error = vm_brk_flags(start, end - start, | |
123 | prot & PROT_EXEC ? VM_EXEC : 0); | |
5d22fc25 LT |
124 | if (error) |
125 | return error; | |
1da177e4 LT |
126 | } |
127 | current->mm->start_brk = current->mm->brk = end; | |
128 | return 0; | |
129 | } | |
130 | ||
1da177e4 LT |
131 | /* We need to explicitly zero any fractional pages |
132 | after the data section (i.e. bss). This would | |
133 | contain the junk from the file that should not | |
f4e5cc2c JJ |
134 | be in memory |
135 | */ | |
1da177e4 LT |
136 | static int padzero(unsigned long elf_bss) |
137 | { | |
138 | unsigned long nbyte; | |
139 | ||
140 | nbyte = ELF_PAGEOFFSET(elf_bss); | |
141 | if (nbyte) { | |
142 | nbyte = ELF_MIN_ALIGN - nbyte; | |
143 | if (clear_user((void __user *) elf_bss, nbyte)) | |
144 | return -EFAULT; | |
145 | } | |
146 | return 0; | |
147 | } | |
148 | ||
09c6dd3c | 149 | /* Let's use some macros to make this stack manipulation a little clearer */ |
1da177e4 LT |
150 | #ifdef CONFIG_STACK_GROWSUP |
151 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items)) | |
152 | #define STACK_ROUND(sp, items) \ | |
153 | ((15 + (unsigned long) ((sp) + (items))) &~ 15UL) | |
f4e5cc2c JJ |
154 | #define STACK_ALLOC(sp, len) ({ \ |
155 | elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \ | |
156 | old_sp; }) | |
1da177e4 LT |
157 | #else |
158 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items)) | |
159 | #define STACK_ROUND(sp, items) \ | |
160 | (((unsigned long) (sp - items)) &~ 15UL) | |
a43e5e3a | 161 | #define STACK_ALLOC(sp, len) (sp -= len) |
1da177e4 LT |
162 | #endif |
163 | ||
483fad1c NL |
164 | #ifndef ELF_BASE_PLATFORM |
165 | /* | |
166 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. | |
167 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value | |
168 | * will be copied to the user stack in the same manner as AT_PLATFORM. | |
169 | */ | |
170 | #define ELF_BASE_PLATFORM NULL | |
171 | #endif | |
172 | ||
1da177e4 | 173 | static int |
a62c5b1b | 174 | create_elf_tables(struct linux_binprm *bprm, const struct elfhdr *exec, |
0da1d500 AK |
175 | unsigned long interp_load_addr, |
176 | unsigned long e_entry, unsigned long phdr_addr) | |
1da177e4 | 177 | { |
03c6d723 | 178 | struct mm_struct *mm = current->mm; |
1da177e4 LT |
179 | unsigned long p = bprm->p; |
180 | int argc = bprm->argc; | |
181 | int envc = bprm->envc; | |
1da177e4 LT |
182 | elf_addr_t __user *sp; |
183 | elf_addr_t __user *u_platform; | |
483fad1c | 184 | elf_addr_t __user *u_base_platform; |
f06295b4 | 185 | elf_addr_t __user *u_rand_bytes; |
1da177e4 | 186 | const char *k_platform = ELF_PLATFORM; |
483fad1c | 187 | const char *k_base_platform = ELF_BASE_PLATFORM; |
f06295b4 | 188 | unsigned char k_rand_bytes[16]; |
1da177e4 LT |
189 | int items; |
190 | elf_addr_t *elf_info; | |
2347961b | 191 | elf_addr_t flags = 0; |
1f83d806 | 192 | int ei_index; |
86a264ab | 193 | const struct cred *cred = current_cred(); |
b6a2fea3 | 194 | struct vm_area_struct *vma; |
1da177e4 | 195 | |
d68c9d6a FBH |
196 | /* |
197 | * In some cases (e.g. Hyper-Threading), we want to avoid L1 | |
198 | * evictions by the processes running on the same package. One | |
199 | * thing we can do is to shuffle the initial stack for them. | |
200 | */ | |
201 | ||
202 | p = arch_align_stack(p); | |
203 | ||
1da177e4 LT |
204 | /* |
205 | * If this architecture has a platform capability string, copy it | |
206 | * to userspace. In some cases (Sparc), this info is impossible | |
207 | * for userspace to get any other way, in others (i386) it is | |
208 | * merely difficult. | |
209 | */ | |
1da177e4 LT |
210 | u_platform = NULL; |
211 | if (k_platform) { | |
212 | size_t len = strlen(k_platform) + 1; | |
213 | ||
1da177e4 | 214 | u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); |
646e84de | 215 | if (copy_to_user(u_platform, k_platform, len)) |
1da177e4 LT |
216 | return -EFAULT; |
217 | } | |
218 | ||
483fad1c NL |
219 | /* |
220 | * If this architecture has a "base" platform capability | |
221 | * string, copy it to userspace. | |
222 | */ | |
223 | u_base_platform = NULL; | |
224 | if (k_base_platform) { | |
225 | size_t len = strlen(k_base_platform) + 1; | |
226 | ||
227 | u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); | |
646e84de | 228 | if (copy_to_user(u_base_platform, k_base_platform, len)) |
483fad1c NL |
229 | return -EFAULT; |
230 | } | |
231 | ||
f06295b4 KC |
232 | /* |
233 | * Generate 16 random bytes for userspace PRNG seeding. | |
234 | */ | |
235 | get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes)); | |
236 | u_rand_bytes = (elf_addr_t __user *) | |
237 | STACK_ALLOC(p, sizeof(k_rand_bytes)); | |
646e84de | 238 | if (copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes))) |
f06295b4 KC |
239 | return -EFAULT; |
240 | ||
1da177e4 | 241 | /* Create the ELF interpreter info */ |
03c6d723 | 242 | elf_info = (elf_addr_t *)mm->saved_auxv; |
4f9a58d7 | 243 | /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */ |
1da177e4 | 244 | #define NEW_AUX_ENT(id, val) \ |
f4e5cc2c | 245 | do { \ |
1f83d806 AD |
246 | *elf_info++ = id; \ |
247 | *elf_info++ = val; \ | |
f4e5cc2c | 248 | } while (0) |
1da177e4 LT |
249 | |
250 | #ifdef ARCH_DLINFO | |
8f6e3f9e | 251 | /* |
1da177e4 LT |
252 | * ARCH_DLINFO must come first so PPC can do its special alignment of |
253 | * AUXV. | |
4f9a58d7 OH |
254 | * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in |
255 | * ARCH_DLINFO changes | |
1da177e4 LT |
256 | */ |
257 | ARCH_DLINFO; | |
258 | #endif | |
259 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); | |
260 | NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE); | |
261 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
0da1d500 | 262 | NEW_AUX_ENT(AT_PHDR, phdr_addr); |
f4e5cc2c | 263 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
1da177e4 LT |
264 | NEW_AUX_ENT(AT_PHNUM, exec->e_phnum); |
265 | NEW_AUX_ENT(AT_BASE, interp_load_addr); | |
2347961b LV |
266 | if (bprm->interp_flags & BINPRM_FLAGS_PRESERVE_ARGV0) |
267 | flags |= AT_FLAGS_PRESERVE_ARGV0; | |
268 | NEW_AUX_ENT(AT_FLAGS, flags); | |
a62c5b1b | 269 | NEW_AUX_ENT(AT_ENTRY, e_entry); |
ebc887b2 EB |
270 | NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid)); |
271 | NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid)); | |
272 | NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid)); | |
273 | NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid)); | |
c425e189 | 274 | NEW_AUX_ENT(AT_SECURE, bprm->secureexec); |
f06295b4 | 275 | NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes); |
2171364d MN |
276 | #ifdef ELF_HWCAP2 |
277 | NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2); | |
278 | #endif | |
65191087 | 279 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
1da177e4 | 280 | if (k_platform) { |
f4e5cc2c | 281 | NEW_AUX_ENT(AT_PLATFORM, |
785d5570 | 282 | (elf_addr_t)(unsigned long)u_platform); |
1da177e4 | 283 | } |
483fad1c NL |
284 | if (k_base_platform) { |
285 | NEW_AUX_ENT(AT_BASE_PLATFORM, | |
286 | (elf_addr_t)(unsigned long)u_base_platform); | |
287 | } | |
b8a61c9e EB |
288 | if (bprm->have_execfd) { |
289 | NEW_AUX_ENT(AT_EXECFD, bprm->execfd); | |
1da177e4 LT |
290 | } |
291 | #undef NEW_AUX_ENT | |
292 | /* AT_NULL is zero; clear the rest too */ | |
03c6d723 AD |
293 | memset(elf_info, 0, (char *)mm->saved_auxv + |
294 | sizeof(mm->saved_auxv) - (char *)elf_info); | |
1da177e4 LT |
295 | |
296 | /* And advance past the AT_NULL entry. */ | |
1f83d806 | 297 | elf_info += 2; |
1da177e4 | 298 | |
03c6d723 | 299 | ei_index = elf_info - (elf_addr_t *)mm->saved_auxv; |
1da177e4 LT |
300 | sp = STACK_ADD(p, ei_index); |
301 | ||
d20894a2 | 302 | items = (argc + 1) + (envc + 1) + 1; |
1da177e4 LT |
303 | bprm->p = STACK_ROUND(sp, items); |
304 | ||
305 | /* Point sp at the lowest address on the stack */ | |
306 | #ifdef CONFIG_STACK_GROWSUP | |
307 | sp = (elf_addr_t __user *)bprm->p - items - ei_index; | |
f4e5cc2c | 308 | bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */ |
1da177e4 LT |
309 | #else |
310 | sp = (elf_addr_t __user *)bprm->p; | |
311 | #endif | |
312 | ||
b6a2fea3 OW |
313 | |
314 | /* | |
315 | * Grow the stack manually; some architectures have a limit on how | |
316 | * far ahead a user-space access may be in order to grow the stack. | |
317 | */ | |
b2767d97 JH |
318 | if (mmap_read_lock_killable(mm)) |
319 | return -EINTR; | |
03c6d723 | 320 | vma = find_extend_vma(mm, bprm->p); |
b2767d97 | 321 | mmap_read_unlock(mm); |
b6a2fea3 OW |
322 | if (!vma) |
323 | return -EFAULT; | |
324 | ||
1da177e4 | 325 | /* Now, let's put argc (and argv, envp if appropriate) on the stack */ |
646e84de | 326 | if (put_user(argc, sp++)) |
1da177e4 | 327 | return -EFAULT; |
1da177e4 | 328 | |
67c6777a | 329 | /* Populate list of argv pointers back to argv strings. */ |
03c6d723 | 330 | p = mm->arg_end = mm->arg_start; |
1da177e4 LT |
331 | while (argc-- > 0) { |
332 | size_t len; | |
646e84de | 333 | if (put_user((elf_addr_t)p, sp++)) |
841d5fb7 | 334 | return -EFAULT; |
b6a2fea3 OW |
335 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
336 | if (!len || len > MAX_ARG_STRLEN) | |
23c4971e | 337 | return -EINVAL; |
1da177e4 LT |
338 | p += len; |
339 | } | |
646e84de | 340 | if (put_user(0, sp++)) |
1da177e4 | 341 | return -EFAULT; |
03c6d723 | 342 | mm->arg_end = p; |
67c6777a KC |
343 | |
344 | /* Populate list of envp pointers back to envp strings. */ | |
03c6d723 | 345 | mm->env_end = mm->env_start = p; |
1da177e4 LT |
346 | while (envc-- > 0) { |
347 | size_t len; | |
646e84de | 348 | if (put_user((elf_addr_t)p, sp++)) |
841d5fb7 | 349 | return -EFAULT; |
b6a2fea3 OW |
350 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
351 | if (!len || len > MAX_ARG_STRLEN) | |
23c4971e | 352 | return -EINVAL; |
1da177e4 LT |
353 | p += len; |
354 | } | |
646e84de | 355 | if (put_user(0, sp++)) |
1da177e4 | 356 | return -EFAULT; |
03c6d723 | 357 | mm->env_end = p; |
1da177e4 LT |
358 | |
359 | /* Put the elf_info on the stack in the right place. */ | |
03c6d723 | 360 | if (copy_to_user(sp, mm->saved_auxv, ei_index * sizeof(elf_addr_t))) |
1da177e4 LT |
361 | return -EFAULT; |
362 | return 0; | |
363 | } | |
364 | ||
1da177e4 | 365 | static unsigned long elf_map(struct file *filep, unsigned long addr, |
49ac9819 | 366 | const struct elf_phdr *eppnt, int prot, int type, |
cc503c1b | 367 | unsigned long total_size) |
1da177e4 LT |
368 | { |
369 | unsigned long map_addr; | |
cc503c1b JK |
370 | unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr); |
371 | unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr); | |
372 | addr = ELF_PAGESTART(addr); | |
373 | size = ELF_PAGEALIGN(size); | |
1da177e4 | 374 | |
dda6ebde DG |
375 | /* mmap() will return -EINVAL if given a zero size, but a |
376 | * segment with zero filesize is perfectly valid */ | |
cc503c1b JK |
377 | if (!size) |
378 | return addr; | |
379 | ||
cc503c1b JK |
380 | /* |
381 | * total_size is the size of the ELF (interpreter) image. | |
382 | * The _first_ mmap needs to know the full size, otherwise | |
383 | * randomization might put this image into an overlapping | |
384 | * position with the ELF binary image. (since size < total_size) | |
385 | * So we first map the 'big' image - and unmap the remainder at | |
386 | * the end. (which unmap is needed for ELF images with holes.) | |
387 | */ | |
388 | if (total_size) { | |
389 | total_size = ELF_PAGEALIGN(total_size); | |
5a5e4c2e | 390 | map_addr = vm_mmap(filep, addr, total_size, prot, type, off); |
cc503c1b | 391 | if (!BAD_ADDR(map_addr)) |
5a5e4c2e | 392 | vm_munmap(map_addr+size, total_size-size); |
cc503c1b | 393 | } else |
5a5e4c2e | 394 | map_addr = vm_mmap(filep, addr, size, prot, type, off); |
cc503c1b | 395 | |
d23a61ee TH |
396 | if ((type & MAP_FIXED_NOREPLACE) && |
397 | PTR_ERR((void *)map_addr) == -EEXIST) | |
398 | pr_info("%d (%s): Uhuuh, elf segment at %px requested but the memory is mapped already\n", | |
399 | task_pid_nr(current), current->comm, (void *)addr); | |
4ed28639 | 400 | |
1da177e4 LT |
401 | return(map_addr); |
402 | } | |
403 | ||
10b19249 | 404 | static unsigned long total_mapping_size(const struct elf_phdr *phdr, int nr) |
cc503c1b | 405 | { |
10b19249 AD |
406 | elf_addr_t min_addr = -1; |
407 | elf_addr_t max_addr = 0; | |
408 | bool pt_load = false; | |
409 | int i; | |
cc503c1b JK |
410 | |
411 | for (i = 0; i < nr; i++) { | |
10b19249 AD |
412 | if (phdr[i].p_type == PT_LOAD) { |
413 | min_addr = min(min_addr, ELF_PAGESTART(phdr[i].p_vaddr)); | |
414 | max_addr = max(max_addr, phdr[i].p_vaddr + phdr[i].p_memsz); | |
415 | pt_load = true; | |
cc503c1b JK |
416 | } |
417 | } | |
10b19249 | 418 | return pt_load ? (max_addr - min_addr) : 0; |
cc503c1b JK |
419 | } |
420 | ||
658c0335 AD |
421 | static int elf_read(struct file *file, void *buf, size_t len, loff_t pos) |
422 | { | |
423 | ssize_t rv; | |
424 | ||
425 | rv = kernel_read(file, buf, len, &pos); | |
426 | if (unlikely(rv != len)) { | |
427 | return (rv < 0) ? rv : -EIO; | |
428 | } | |
429 | return 0; | |
430 | } | |
431 | ||
ce81bb25 CK |
432 | static unsigned long maximum_alignment(struct elf_phdr *cmds, int nr) |
433 | { | |
434 | unsigned long alignment = 0; | |
435 | int i; | |
436 | ||
437 | for (i = 0; i < nr; i++) { | |
438 | if (cmds[i].p_type == PT_LOAD) { | |
439 | unsigned long p_align = cmds[i].p_align; | |
440 | ||
441 | /* skip non-power of two alignments as invalid */ | |
442 | if (!is_power_of_2(p_align)) | |
443 | continue; | |
444 | alignment = max(alignment, p_align); | |
445 | } | |
446 | } | |
447 | ||
448 | /* ensure we align to at least one page */ | |
449 | return ELF_PAGEALIGN(alignment); | |
450 | } | |
451 | ||
6a8d3894 PB |
452 | /** |
453 | * load_elf_phdrs() - load ELF program headers | |
454 | * @elf_ex: ELF header of the binary whose program headers should be loaded | |
455 | * @elf_file: the opened ELF binary file | |
456 | * | |
457 | * Loads ELF program headers from the binary file elf_file, which has the ELF | |
458 | * header pointed to by elf_ex, into a newly allocated array. The caller is | |
cfc46ca4 | 459 | * responsible for freeing the allocated data. Returns NULL upon failure. |
6a8d3894 | 460 | */ |
49ac9819 | 461 | static struct elf_phdr *load_elf_phdrs(const struct elfhdr *elf_ex, |
6a8d3894 PB |
462 | struct file *elf_file) |
463 | { | |
464 | struct elf_phdr *elf_phdata = NULL; | |
ef20c513 | 465 | int retval = -1; |
faf1c315 | 466 | unsigned int size; |
6a8d3894 PB |
467 | |
468 | /* | |
469 | * If the size of this structure has changed, then punt, since | |
470 | * we will be doing the wrong thing. | |
471 | */ | |
472 | if (elf_ex->e_phentsize != sizeof(struct elf_phdr)) | |
473 | goto out; | |
474 | ||
475 | /* Sanity check the number of program headers... */ | |
6a8d3894 PB |
476 | /* ...and their total size. */ |
477 | size = sizeof(struct elf_phdr) * elf_ex->e_phnum; | |
faf1c315 | 478 | if (size == 0 || size > 65536 || size > ELF_MIN_ALIGN) |
6a8d3894 PB |
479 | goto out; |
480 | ||
481 | elf_phdata = kmalloc(size, GFP_KERNEL); | |
482 | if (!elf_phdata) | |
483 | goto out; | |
484 | ||
485 | /* Read in the program headers */ | |
658c0335 | 486 | retval = elf_read(elf_file, elf_phdata, size, elf_ex->e_phoff); |
6a8d3894 | 487 | |
6a8d3894 | 488 | out: |
ef20c513 | 489 | if (retval) { |
6a8d3894 PB |
490 | kfree(elf_phdata); |
491 | elf_phdata = NULL; | |
492 | } | |
493 | return elf_phdata; | |
494 | } | |
cc503c1b | 495 | |
774c105e PB |
496 | #ifndef CONFIG_ARCH_BINFMT_ELF_STATE |
497 | ||
498 | /** | |
499 | * struct arch_elf_state - arch-specific ELF loading state | |
500 | * | |
501 | * This structure is used to preserve architecture specific data during | |
502 | * the loading of an ELF file, throughout the checking of architecture | |
503 | * specific ELF headers & through to the point where the ELF load is | |
504 | * known to be proceeding (ie. SET_PERSONALITY). | |
505 | * | |
506 | * This implementation is a dummy for architectures which require no | |
507 | * specific state. | |
508 | */ | |
509 | struct arch_elf_state { | |
510 | }; | |
511 | ||
512 | #define INIT_ARCH_ELF_STATE {} | |
513 | ||
514 | /** | |
515 | * arch_elf_pt_proc() - check a PT_LOPROC..PT_HIPROC ELF program header | |
516 | * @ehdr: The main ELF header | |
517 | * @phdr: The program header to check | |
518 | * @elf: The open ELF file | |
519 | * @is_interp: True if the phdr is from the interpreter of the ELF being | |
520 | * loaded, else false. | |
521 | * @state: Architecture-specific state preserved throughout the process | |
522 | * of loading the ELF. | |
523 | * | |
524 | * Inspects the program header phdr to validate its correctness and/or | |
525 | * suitability for the system. Called once per ELF program header in the | |
526 | * range PT_LOPROC to PT_HIPROC, for both the ELF being loaded and its | |
527 | * interpreter. | |
528 | * | |
529 | * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load | |
530 | * with that return code. | |
531 | */ | |
532 | static inline int arch_elf_pt_proc(struct elfhdr *ehdr, | |
533 | struct elf_phdr *phdr, | |
534 | struct file *elf, bool is_interp, | |
535 | struct arch_elf_state *state) | |
536 | { | |
537 | /* Dummy implementation, always proceed */ | |
538 | return 0; | |
539 | } | |
540 | ||
541 | /** | |
54d15714 | 542 | * arch_check_elf() - check an ELF executable |
774c105e PB |
543 | * @ehdr: The main ELF header |
544 | * @has_interp: True if the ELF has an interpreter, else false. | |
eb4bc076 | 545 | * @interp_ehdr: The interpreter's ELF header |
774c105e PB |
546 | * @state: Architecture-specific state preserved throughout the process |
547 | * of loading the ELF. | |
548 | * | |
549 | * Provides a final opportunity for architecture code to reject the loading | |
550 | * of the ELF & cause an exec syscall to return an error. This is called after | |
551 | * all program headers to be checked by arch_elf_pt_proc have been. | |
552 | * | |
553 | * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load | |
554 | * with that return code. | |
555 | */ | |
556 | static inline int arch_check_elf(struct elfhdr *ehdr, bool has_interp, | |
eb4bc076 | 557 | struct elfhdr *interp_ehdr, |
774c105e PB |
558 | struct arch_elf_state *state) |
559 | { | |
560 | /* Dummy implementation, always proceed */ | |
561 | return 0; | |
562 | } | |
563 | ||
564 | #endif /* !CONFIG_ARCH_BINFMT_ELF_STATE */ | |
cc503c1b | 565 | |
fe0f6766 DM |
566 | static inline int make_prot(u32 p_flags, struct arch_elf_state *arch_state, |
567 | bool has_interp, bool is_interp) | |
d8e7cb39 AD |
568 | { |
569 | int prot = 0; | |
570 | ||
571 | if (p_flags & PF_R) | |
572 | prot |= PROT_READ; | |
573 | if (p_flags & PF_W) | |
574 | prot |= PROT_WRITE; | |
575 | if (p_flags & PF_X) | |
576 | prot |= PROT_EXEC; | |
fe0f6766 DM |
577 | |
578 | return arch_elf_adjust_prot(prot, arch_state, has_interp, is_interp); | |
d8e7cb39 AD |
579 | } |
580 | ||
1da177e4 LT |
581 | /* This is much more generalized than the library routine read function, |
582 | so we keep this separate. Technically the library read function | |
583 | is only provided so that we can read a.out libraries that have | |
584 | an ELF header */ | |
585 | ||
f4e5cc2c | 586 | static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex, |
81696d5d | 587 | struct file *interpreter, |
fe0f6766 DM |
588 | unsigned long no_base, struct elf_phdr *interp_elf_phdata, |
589 | struct arch_elf_state *arch_state) | |
1da177e4 | 590 | { |
1da177e4 LT |
591 | struct elf_phdr *eppnt; |
592 | unsigned long load_addr = 0; | |
593 | int load_addr_set = 0; | |
594 | unsigned long last_bss = 0, elf_bss = 0; | |
16e72e9b | 595 | int bss_prot = 0; |
1da177e4 | 596 | unsigned long error = ~0UL; |
cc503c1b | 597 | unsigned long total_size; |
6a8d3894 | 598 | int i; |
1da177e4 LT |
599 | |
600 | /* First of all, some simple consistency checks */ | |
601 | if (interp_elf_ex->e_type != ET_EXEC && | |
602 | interp_elf_ex->e_type != ET_DYN) | |
603 | goto out; | |
4755200b NP |
604 | if (!elf_check_arch(interp_elf_ex) || |
605 | elf_check_fdpic(interp_elf_ex)) | |
1da177e4 | 606 | goto out; |
72c2d531 | 607 | if (!interpreter->f_op->mmap) |
1da177e4 LT |
608 | goto out; |
609 | ||
a9d9ef13 PB |
610 | total_size = total_mapping_size(interp_elf_phdata, |
611 | interp_elf_ex->e_phnum); | |
cc503c1b JK |
612 | if (!total_size) { |
613 | error = -EINVAL; | |
a9d9ef13 | 614 | goto out; |
cc503c1b JK |
615 | } |
616 | ||
a9d9ef13 | 617 | eppnt = interp_elf_phdata; |
f4e5cc2c JJ |
618 | for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) { |
619 | if (eppnt->p_type == PT_LOAD) { | |
4589ff7c | 620 | int elf_type = MAP_PRIVATE; |
fe0f6766 DM |
621 | int elf_prot = make_prot(eppnt->p_flags, arch_state, |
622 | true, true); | |
f4e5cc2c JJ |
623 | unsigned long vaddr = 0; |
624 | unsigned long k, map_addr; | |
625 | ||
f4e5cc2c JJ |
626 | vaddr = eppnt->p_vaddr; |
627 | if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) | |
9b2f72cc | 628 | elf_type |= MAP_FIXED; |
cc503c1b JK |
629 | else if (no_base && interp_elf_ex->e_type == ET_DYN) |
630 | load_addr = -vaddr; | |
f4e5cc2c JJ |
631 | |
632 | map_addr = elf_map(interpreter, load_addr + vaddr, | |
bb1ad820 | 633 | eppnt, elf_prot, elf_type, total_size); |
cc503c1b | 634 | total_size = 0; |
f4e5cc2c JJ |
635 | error = map_addr; |
636 | if (BAD_ADDR(map_addr)) | |
a9d9ef13 | 637 | goto out; |
f4e5cc2c JJ |
638 | |
639 | if (!load_addr_set && | |
640 | interp_elf_ex->e_type == ET_DYN) { | |
641 | load_addr = map_addr - ELF_PAGESTART(vaddr); | |
642 | load_addr_set = 1; | |
643 | } | |
644 | ||
645 | /* | |
646 | * Check to see if the section's size will overflow the | |
647 | * allowed task size. Note that p_filesz must always be | |
648 | * <= p_memsize so it's only necessary to check p_memsz. | |
649 | */ | |
650 | k = load_addr + eppnt->p_vaddr; | |
ce51059b | 651 | if (BAD_ADDR(k) || |
f4e5cc2c JJ |
652 | eppnt->p_filesz > eppnt->p_memsz || |
653 | eppnt->p_memsz > TASK_SIZE || | |
654 | TASK_SIZE - eppnt->p_memsz < k) { | |
655 | error = -ENOMEM; | |
a9d9ef13 | 656 | goto out; |
f4e5cc2c JJ |
657 | } |
658 | ||
659 | /* | |
660 | * Find the end of the file mapping for this phdr, and | |
661 | * keep track of the largest address we see for this. | |
662 | */ | |
663 | k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; | |
664 | if (k > elf_bss) | |
665 | elf_bss = k; | |
666 | ||
667 | /* | |
668 | * Do the same thing for the memory mapping - between | |
669 | * elf_bss and last_bss is the bss section. | |
670 | */ | |
0036d1f7 | 671 | k = load_addr + eppnt->p_vaddr + eppnt->p_memsz; |
16e72e9b | 672 | if (k > last_bss) { |
f4e5cc2c | 673 | last_bss = k; |
16e72e9b DV |
674 | bss_prot = elf_prot; |
675 | } | |
f4e5cc2c | 676 | } |
1da177e4 LT |
677 | } |
678 | ||
0036d1f7 KC |
679 | /* |
680 | * Now fill out the bss section: first pad the last page from | |
681 | * the file up to the page boundary, and zero it from elf_bss | |
682 | * up to the end of the page. | |
683 | */ | |
684 | if (padzero(elf_bss)) { | |
685 | error = -EFAULT; | |
686 | goto out; | |
687 | } | |
688 | /* | |
689 | * Next, align both the file and mem bss up to the page size, | |
690 | * since this is where elf_bss was just zeroed up to, and where | |
16e72e9b | 691 | * last_bss will end after the vm_brk_flags() below. |
0036d1f7 KC |
692 | */ |
693 | elf_bss = ELF_PAGEALIGN(elf_bss); | |
694 | last_bss = ELF_PAGEALIGN(last_bss); | |
695 | /* Finally, if there is still more bss to allocate, do it. */ | |
752015d1 | 696 | if (last_bss > elf_bss) { |
16e72e9b DV |
697 | error = vm_brk_flags(elf_bss, last_bss - elf_bss, |
698 | bss_prot & PROT_EXEC ? VM_EXEC : 0); | |
5d22fc25 | 699 | if (error) |
a9d9ef13 | 700 | goto out; |
1da177e4 LT |
701 | } |
702 | ||
cc503c1b | 703 | error = load_addr; |
1da177e4 LT |
704 | out: |
705 | return error; | |
706 | } | |
707 | ||
1da177e4 LT |
708 | /* |
709 | * These are the functions used to load ELF style executables and shared | |
710 | * libraries. There is no binary dependent code anywhere else. | |
711 | */ | |
712 | ||
00e19cee DM |
713 | static int parse_elf_property(const char *data, size_t *off, size_t datasz, |
714 | struct arch_elf_state *arch, | |
715 | bool have_prev_type, u32 *prev_type) | |
716 | { | |
717 | size_t o, step; | |
718 | const struct gnu_property *pr; | |
719 | int ret; | |
720 | ||
721 | if (*off == datasz) | |
722 | return -ENOENT; | |
723 | ||
724 | if (WARN_ON_ONCE(*off > datasz || *off % ELF_GNU_PROPERTY_ALIGN)) | |
725 | return -EIO; | |
726 | o = *off; | |
727 | datasz -= *off; | |
728 | ||
729 | if (datasz < sizeof(*pr)) | |
730 | return -ENOEXEC; | |
731 | pr = (const struct gnu_property *)(data + o); | |
732 | o += sizeof(*pr); | |
733 | datasz -= sizeof(*pr); | |
734 | ||
735 | if (pr->pr_datasz > datasz) | |
736 | return -ENOEXEC; | |
737 | ||
738 | WARN_ON_ONCE(o % ELF_GNU_PROPERTY_ALIGN); | |
739 | step = round_up(pr->pr_datasz, ELF_GNU_PROPERTY_ALIGN); | |
740 | if (step > datasz) | |
741 | return -ENOEXEC; | |
742 | ||
743 | /* Properties are supposed to be unique and sorted on pr_type: */ | |
744 | if (have_prev_type && pr->pr_type <= *prev_type) | |
745 | return -ENOEXEC; | |
746 | *prev_type = pr->pr_type; | |
747 | ||
748 | ret = arch_parse_elf_property(pr->pr_type, data + o, | |
749 | pr->pr_datasz, ELF_COMPAT, arch); | |
750 | if (ret) | |
751 | return ret; | |
752 | ||
753 | *off = o + step; | |
754 | return 0; | |
755 | } | |
756 | ||
757 | #define NOTE_DATA_SZ SZ_1K | |
758 | #define GNU_PROPERTY_TYPE_0_NAME "GNU" | |
759 | #define NOTE_NAME_SZ (sizeof(GNU_PROPERTY_TYPE_0_NAME)) | |
760 | ||
761 | static int parse_elf_properties(struct file *f, const struct elf_phdr *phdr, | |
762 | struct arch_elf_state *arch) | |
763 | { | |
764 | union { | |
765 | struct elf_note nhdr; | |
766 | char data[NOTE_DATA_SZ]; | |
767 | } note; | |
768 | loff_t pos; | |
769 | ssize_t n; | |
770 | size_t off, datasz; | |
771 | int ret; | |
772 | bool have_prev_type; | |
773 | u32 prev_type; | |
774 | ||
775 | if (!IS_ENABLED(CONFIG_ARCH_USE_GNU_PROPERTY) || !phdr) | |
776 | return 0; | |
777 | ||
778 | /* load_elf_binary() shouldn't call us unless this is true... */ | |
779 | if (WARN_ON_ONCE(phdr->p_type != PT_GNU_PROPERTY)) | |
780 | return -ENOEXEC; | |
781 | ||
782 | /* If the properties are crazy large, that's too bad (for now): */ | |
783 | if (phdr->p_filesz > sizeof(note)) | |
784 | return -ENOEXEC; | |
785 | ||
786 | pos = phdr->p_offset; | |
787 | n = kernel_read(f, ¬e, phdr->p_filesz, &pos); | |
788 | ||
789 | BUILD_BUG_ON(sizeof(note) < sizeof(note.nhdr) + NOTE_NAME_SZ); | |
790 | if (n < 0 || n < sizeof(note.nhdr) + NOTE_NAME_SZ) | |
791 | return -EIO; | |
792 | ||
793 | if (note.nhdr.n_type != NT_GNU_PROPERTY_TYPE_0 || | |
794 | note.nhdr.n_namesz != NOTE_NAME_SZ || | |
795 | strncmp(note.data + sizeof(note.nhdr), | |
796 | GNU_PROPERTY_TYPE_0_NAME, n - sizeof(note.nhdr))) | |
797 | return -ENOEXEC; | |
798 | ||
799 | off = round_up(sizeof(note.nhdr) + NOTE_NAME_SZ, | |
800 | ELF_GNU_PROPERTY_ALIGN); | |
801 | if (off > n) | |
802 | return -ENOEXEC; | |
803 | ||
804 | if (note.nhdr.n_descsz > n - off) | |
805 | return -ENOEXEC; | |
806 | datasz = off + note.nhdr.n_descsz; | |
807 | ||
808 | have_prev_type = false; | |
809 | do { | |
810 | ret = parse_elf_property(note.data, &off, datasz, arch, | |
811 | have_prev_type, &prev_type); | |
812 | have_prev_type = true; | |
813 | } while (!ret); | |
814 | ||
815 | return ret == -ENOENT ? 0 : ret; | |
816 | } | |
817 | ||
71613c3b | 818 | static int load_elf_binary(struct linux_binprm *bprm) |
1da177e4 LT |
819 | { |
820 | struct file *interpreter = NULL; /* to shut gcc up */ | |
2b4bfbe0 AK |
821 | unsigned long load_bias = 0, phdr_addr = 0; |
822 | int first_pt_load = 1; | |
1da177e4 | 823 | unsigned long error; |
a9d9ef13 | 824 | struct elf_phdr *elf_ppnt, *elf_phdata, *interp_elf_phdata = NULL; |
00e19cee | 825 | struct elf_phdr *elf_property_phdata = NULL; |
1da177e4 | 826 | unsigned long elf_bss, elf_brk; |
16e72e9b | 827 | int bss_prot = 0; |
1da177e4 | 828 | int retval, i; |
cc503c1b | 829 | unsigned long elf_entry; |
a62c5b1b | 830 | unsigned long e_entry; |
cc503c1b | 831 | unsigned long interp_load_addr = 0; |
1da177e4 | 832 | unsigned long start_code, end_code, start_data, end_data; |
1a530a6f | 833 | unsigned long reloc_func_desc __maybe_unused = 0; |
8de61e69 | 834 | int executable_stack = EXSTACK_DEFAULT; |
a62c5b1b | 835 | struct elfhdr *elf_ex = (struct elfhdr *)bprm->buf; |
0693ffeb | 836 | struct elfhdr *interp_elf_ex = NULL; |
774c105e | 837 | struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE; |
03c6d723 | 838 | struct mm_struct *mm; |
249b08e4 | 839 | struct pt_regs *regs; |
1da177e4 | 840 | |
1da177e4 LT |
841 | retval = -ENOEXEC; |
842 | /* First of all, some simple consistency checks */ | |
a62c5b1b | 843 | if (memcmp(elf_ex->e_ident, ELFMAG, SELFMAG) != 0) |
1da177e4 LT |
844 | goto out; |
845 | ||
a62c5b1b | 846 | if (elf_ex->e_type != ET_EXEC && elf_ex->e_type != ET_DYN) |
1da177e4 | 847 | goto out; |
a62c5b1b | 848 | if (!elf_check_arch(elf_ex)) |
1da177e4 | 849 | goto out; |
a62c5b1b | 850 | if (elf_check_fdpic(elf_ex)) |
4755200b | 851 | goto out; |
72c2d531 | 852 | if (!bprm->file->f_op->mmap) |
1da177e4 LT |
853 | goto out; |
854 | ||
a62c5b1b | 855 | elf_phdata = load_elf_phdrs(elf_ex, bprm->file); |
1da177e4 LT |
856 | if (!elf_phdata) |
857 | goto out; | |
858 | ||
1da177e4 | 859 | elf_ppnt = elf_phdata; |
a62c5b1b | 860 | for (i = 0; i < elf_ex->e_phnum; i++, elf_ppnt++) { |
be0deb58 | 861 | char *elf_interpreter; |
1da177e4 | 862 | |
00e19cee DM |
863 | if (elf_ppnt->p_type == PT_GNU_PROPERTY) { |
864 | elf_property_phdata = elf_ppnt; | |
865 | continue; | |
866 | } | |
867 | ||
be0deb58 AD |
868 | if (elf_ppnt->p_type != PT_INTERP) |
869 | continue; | |
1fb84496 | 870 | |
be0deb58 AD |
871 | /* |
872 | * This is the program interpreter used for shared libraries - | |
873 | * for now assume that this is an a.out format binary. | |
874 | */ | |
875 | retval = -ENOEXEC; | |
876 | if (elf_ppnt->p_filesz > PATH_MAX || elf_ppnt->p_filesz < 2) | |
877 | goto out_free_ph; | |
1da177e4 | 878 | |
be0deb58 AD |
879 | retval = -ENOMEM; |
880 | elf_interpreter = kmalloc(elf_ppnt->p_filesz, GFP_KERNEL); | |
881 | if (!elf_interpreter) | |
882 | goto out_free_ph; | |
cc338010 | 883 | |
658c0335 AD |
884 | retval = elf_read(bprm->file, elf_interpreter, elf_ppnt->p_filesz, |
885 | elf_ppnt->p_offset); | |
886 | if (retval < 0) | |
be0deb58 | 887 | goto out_free_interp; |
be0deb58 AD |
888 | /* make sure path is NULL terminated */ |
889 | retval = -ENOEXEC; | |
890 | if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0') | |
891 | goto out_free_interp; | |
892 | ||
893 | interpreter = open_exec(elf_interpreter); | |
894 | kfree(elf_interpreter); | |
895 | retval = PTR_ERR(interpreter); | |
896 | if (IS_ERR(interpreter)) | |
cc338010 | 897 | goto out_free_ph; |
be0deb58 AD |
898 | |
899 | /* | |
900 | * If the binary is not readable then enforce mm->dumpable = 0 | |
901 | * regardless of the interpreter's permissions. | |
902 | */ | |
903 | would_dump(bprm, interpreter); | |
904 | ||
0693ffeb AD |
905 | interp_elf_ex = kmalloc(sizeof(*interp_elf_ex), GFP_KERNEL); |
906 | if (!interp_elf_ex) { | |
907 | retval = -ENOMEM; | |
594d2a14 | 908 | goto out_free_file; |
0693ffeb AD |
909 | } |
910 | ||
be0deb58 | 911 | /* Get the exec headers */ |
c69bcc93 AD |
912 | retval = elf_read(interpreter, interp_elf_ex, |
913 | sizeof(*interp_elf_ex), 0); | |
658c0335 | 914 | if (retval < 0) |
be0deb58 | 915 | goto out_free_dentry; |
be0deb58 AD |
916 | |
917 | break; | |
918 | ||
919 | out_free_interp: | |
920 | kfree(elf_interpreter); | |
921 | goto out_free_ph; | |
1da177e4 LT |
922 | } |
923 | ||
924 | elf_ppnt = elf_phdata; | |
a62c5b1b | 925 | for (i = 0; i < elf_ex->e_phnum; i++, elf_ppnt++) |
774c105e PB |
926 | switch (elf_ppnt->p_type) { |
927 | case PT_GNU_STACK: | |
1da177e4 LT |
928 | if (elf_ppnt->p_flags & PF_X) |
929 | executable_stack = EXSTACK_ENABLE_X; | |
930 | else | |
931 | executable_stack = EXSTACK_DISABLE_X; | |
932 | break; | |
774c105e PB |
933 | |
934 | case PT_LOPROC ... PT_HIPROC: | |
a62c5b1b | 935 | retval = arch_elf_pt_proc(elf_ex, elf_ppnt, |
774c105e PB |
936 | bprm->file, false, |
937 | &arch_state); | |
938 | if (retval) | |
939 | goto out_free_dentry; | |
940 | break; | |
1da177e4 | 941 | } |
1da177e4 LT |
942 | |
943 | /* Some simple consistency checks for the interpreter */ | |
cc338010 | 944 | if (interpreter) { |
1da177e4 | 945 | retval = -ELIBBAD; |
d20894a2 | 946 | /* Not an ELF interpreter */ |
c69bcc93 | 947 | if (memcmp(interp_elf_ex->e_ident, ELFMAG, SELFMAG) != 0) |
1da177e4 | 948 | goto out_free_dentry; |
1da177e4 | 949 | /* Verify the interpreter has a valid arch */ |
c69bcc93 AD |
950 | if (!elf_check_arch(interp_elf_ex) || |
951 | elf_check_fdpic(interp_elf_ex)) | |
1da177e4 | 952 | goto out_free_dentry; |
a9d9ef13 PB |
953 | |
954 | /* Load the interpreter program headers */ | |
c69bcc93 | 955 | interp_elf_phdata = load_elf_phdrs(interp_elf_ex, |
a9d9ef13 PB |
956 | interpreter); |
957 | if (!interp_elf_phdata) | |
958 | goto out_free_dentry; | |
774c105e PB |
959 | |
960 | /* Pass PT_LOPROC..PT_HIPROC headers to arch code */ | |
00e19cee | 961 | elf_property_phdata = NULL; |
774c105e | 962 | elf_ppnt = interp_elf_phdata; |
c69bcc93 | 963 | for (i = 0; i < interp_elf_ex->e_phnum; i++, elf_ppnt++) |
774c105e | 964 | switch (elf_ppnt->p_type) { |
00e19cee DM |
965 | case PT_GNU_PROPERTY: |
966 | elf_property_phdata = elf_ppnt; | |
967 | break; | |
968 | ||
774c105e | 969 | case PT_LOPROC ... PT_HIPROC: |
c69bcc93 | 970 | retval = arch_elf_pt_proc(interp_elf_ex, |
774c105e PB |
971 | elf_ppnt, interpreter, |
972 | true, &arch_state); | |
973 | if (retval) | |
974 | goto out_free_dentry; | |
975 | break; | |
976 | } | |
1da177e4 LT |
977 | } |
978 | ||
00e19cee DM |
979 | retval = parse_elf_properties(interpreter ?: bprm->file, |
980 | elf_property_phdata, &arch_state); | |
981 | if (retval) | |
982 | goto out_free_dentry; | |
983 | ||
774c105e PB |
984 | /* |
985 | * Allow arch code to reject the ELF at this point, whilst it's | |
986 | * still possible to return an error to the code that invoked | |
987 | * the exec syscall. | |
988 | */ | |
a62c5b1b | 989 | retval = arch_check_elf(elf_ex, |
c69bcc93 | 990 | !!interpreter, interp_elf_ex, |
eb4bc076 | 991 | &arch_state); |
774c105e PB |
992 | if (retval) |
993 | goto out_free_dentry; | |
994 | ||
1da177e4 | 995 | /* Flush all traces of the currently running executable */ |
2388777a | 996 | retval = begin_new_exec(bprm); |
1da177e4 LT |
997 | if (retval) |
998 | goto out_free_dentry; | |
999 | ||
1da177e4 LT |
1000 | /* Do this immediately, since STACK_TOP as used in setup_arg_pages |
1001 | may depend on the personality. */ | |
a62c5b1b AD |
1002 | SET_PERSONALITY2(*elf_ex, &arch_state); |
1003 | if (elf_read_implies_exec(*elf_ex, executable_stack)) | |
1da177e4 LT |
1004 | current->personality |= READ_IMPLIES_EXEC; |
1005 | ||
f4e5cc2c | 1006 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
1da177e4 | 1007 | current->flags |= PF_RANDOMIZE; |
221af7f8 LT |
1008 | |
1009 | setup_new_exec(bprm); | |
1da177e4 LT |
1010 | |
1011 | /* Do this so that we can load the interpreter, if need be. We will | |
1012 | change some of these later */ | |
1da177e4 LT |
1013 | retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP), |
1014 | executable_stack); | |
19d860a1 | 1015 | if (retval < 0) |
1da177e4 | 1016 | goto out_free_dentry; |
8f6e3f9e | 1017 | |
85264316 AD |
1018 | elf_bss = 0; |
1019 | elf_brk = 0; | |
1020 | ||
1021 | start_code = ~0UL; | |
1022 | end_code = 0; | |
1023 | start_data = 0; | |
1024 | end_data = 0; | |
1025 | ||
af901ca1 | 1026 | /* Now we do a little grungy work by mmapping the ELF image into |
cc503c1b | 1027 | the correct location in memory. */ |
f4e5cc2c | 1028 | for(i = 0, elf_ppnt = elf_phdata; |
a62c5b1b | 1029 | i < elf_ex->e_phnum; i++, elf_ppnt++) { |
b212921b | 1030 | int elf_prot, elf_flags; |
1da177e4 | 1031 | unsigned long k, vaddr; |
a87938b2 | 1032 | unsigned long total_size = 0; |
ce81bb25 | 1033 | unsigned long alignment; |
1da177e4 LT |
1034 | |
1035 | if (elf_ppnt->p_type != PT_LOAD) | |
1036 | continue; | |
1037 | ||
1038 | if (unlikely (elf_brk > elf_bss)) { | |
1039 | unsigned long nbyte; | |
8f6e3f9e | 1040 | |
1da177e4 LT |
1041 | /* There was a PT_LOAD segment with p_memsz > p_filesz |
1042 | before this one. Map anonymous pages, if needed, | |
1043 | and clear the area. */ | |
f670d0ec | 1044 | retval = set_brk(elf_bss + load_bias, |
16e72e9b DV |
1045 | elf_brk + load_bias, |
1046 | bss_prot); | |
19d860a1 | 1047 | if (retval) |
1da177e4 | 1048 | goto out_free_dentry; |
1da177e4 LT |
1049 | nbyte = ELF_PAGEOFFSET(elf_bss); |
1050 | if (nbyte) { | |
1051 | nbyte = ELF_MIN_ALIGN - nbyte; | |
1052 | if (nbyte > elf_brk - elf_bss) | |
1053 | nbyte = elf_brk - elf_bss; | |
1054 | if (clear_user((void __user *)elf_bss + | |
1055 | load_bias, nbyte)) { | |
1056 | /* | |
1057 | * This bss-zeroing can fail if the ELF | |
f4e5cc2c | 1058 | * file specifies odd protections. So |
1da177e4 LT |
1059 | * we don't check the return value |
1060 | */ | |
1061 | } | |
1062 | } | |
1063 | } | |
1064 | ||
fe0f6766 DM |
1065 | elf_prot = make_prot(elf_ppnt->p_flags, &arch_state, |
1066 | !!interpreter, false); | |
1da177e4 | 1067 | |
4589ff7c | 1068 | elf_flags = MAP_PRIVATE; |
1da177e4 LT |
1069 | |
1070 | vaddr = elf_ppnt->p_vaddr; | |
eab09532 | 1071 | /* |
2b4bfbe0 | 1072 | * The first time through the loop, first_pt_load is true: |
5f501d55 KC |
1073 | * layout will be calculated. Once set, use MAP_FIXED since |
1074 | * we know we've already safely mapped the entire region with | |
1075 | * MAP_FIXED_NOREPLACE in the once-per-binary logic following. | |
eab09532 | 1076 | */ |
2b4bfbe0 | 1077 | if (!first_pt_load) { |
b212921b | 1078 | elf_flags |= MAP_FIXED; |
5f501d55 KC |
1079 | } else if (elf_ex->e_type == ET_EXEC) { |
1080 | /* | |
1081 | * This logic is run once for the first LOAD Program | |
1082 | * Header for ET_EXEC binaries. No special handling | |
1083 | * is needed. | |
1084 | */ | |
1085 | elf_flags |= MAP_FIXED_NOREPLACE; | |
a62c5b1b | 1086 | } else if (elf_ex->e_type == ET_DYN) { |
eab09532 KC |
1087 | /* |
1088 | * This logic is run once for the first LOAD Program | |
1089 | * Header for ET_DYN binaries to calculate the | |
1090 | * randomization (load_bias) for all the LOAD | |
5f501d55 | 1091 | * Program Headers. |
eab09532 KC |
1092 | * |
1093 | * There are effectively two types of ET_DYN | |
1094 | * binaries: programs (i.e. PIE: ET_DYN with INTERP) | |
1095 | * and loaders (ET_DYN without INTERP, since they | |
1096 | * _are_ the ELF interpreter). The loaders must | |
1097 | * be loaded away from programs since the program | |
1098 | * may otherwise collide with the loader (especially | |
1099 | * for ET_EXEC which does not have a randomized | |
1100 | * position). For example to handle invocations of | |
1101 | * "./ld.so someprog" to test out a new version of | |
1102 | * the loader, the subsequent program that the | |
1103 | * loader loads must avoid the loader itself, so | |
1104 | * they cannot share the same load range. Sufficient | |
1105 | * room for the brk must be allocated with the | |
1106 | * loader as well, since brk must be available with | |
1107 | * the loader. | |
1108 | * | |
1109 | * Therefore, programs are loaded offset from | |
1110 | * ELF_ET_DYN_BASE and loaders are loaded into the | |
1111 | * independently randomized mmap region (0 load_bias | |
5f501d55 | 1112 | * without MAP_FIXED nor MAP_FIXED_NOREPLACE). |
eab09532 | 1113 | */ |
aeb79237 | 1114 | if (interpreter) { |
eab09532 KC |
1115 | load_bias = ELF_ET_DYN_BASE; |
1116 | if (current->flags & PF_RANDOMIZE) | |
1117 | load_bias += arch_mmap_rnd(); | |
aeb79237 | 1118 | alignment = maximum_alignment(elf_phdata, elf_ex->e_phnum); |
ce81bb25 CK |
1119 | if (alignment) |
1120 | load_bias &= ~(alignment - 1); | |
5f501d55 | 1121 | elf_flags |= MAP_FIXED_NOREPLACE; |
eab09532 KC |
1122 | } else |
1123 | load_bias = 0; | |
1124 | ||
1125 | /* | |
1126 | * Since load_bias is used for all subsequent loading | |
1127 | * calculations, we must lower it by the first vaddr | |
1128 | * so that the remaining calculations based on the | |
1129 | * ELF vaddrs will be correctly offset. The result | |
1130 | * is then page aligned. | |
1131 | */ | |
1132 | load_bias = ELF_PAGESTART(load_bias - vaddr); | |
1133 | ||
439a8468 KC |
1134 | /* |
1135 | * Calculate the entire size of the ELF mapping | |
1136 | * (total_size), used for the initial mapping, | |
1137 | * due to load_addr_set which is set to true later | |
1138 | * once the initial mapping is performed. | |
1139 | * | |
1140 | * Note that this is only sensible when the LOAD | |
1141 | * segments are contiguous (or overlapping). If | |
1142 | * used for LOADs that are far apart, this would | |
1143 | * cause the holes between LOADs to be mapped, | |
1144 | * running the risk of having the mapping fail, | |
1145 | * as it would be larger than the ELF file itself. | |
1146 | * | |
1147 | * As a result, only ET_DYN does this, since | |
1148 | * some ET_EXEC (e.g. ia64) may have large virtual | |
1149 | * memory holes between LOADs. | |
1150 | * | |
1151 | */ | |
a87938b2 | 1152 | total_size = total_mapping_size(elf_phdata, |
a62c5b1b | 1153 | elf_ex->e_phnum); |
a87938b2 | 1154 | if (!total_size) { |
2b1d3ae9 | 1155 | retval = -EINVAL; |
a87938b2 MD |
1156 | goto out_free_dentry; |
1157 | } | |
1da177e4 LT |
1158 | } |
1159 | ||
f4e5cc2c | 1160 | error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, |
a87938b2 | 1161 | elf_prot, elf_flags, total_size); |
1da177e4 | 1162 | if (BAD_ADDR(error)) { |
dc64cc12 | 1163 | retval = IS_ERR_VALUE(error) ? |
b140f251 | 1164 | PTR_ERR((void*)error) : -EINVAL; |
1da177e4 LT |
1165 | goto out_free_dentry; |
1166 | } | |
1167 | ||
2b4bfbe0 AK |
1168 | if (first_pt_load) { |
1169 | first_pt_load = 0; | |
a62c5b1b | 1170 | if (elf_ex->e_type == ET_DYN) { |
1da177e4 LT |
1171 | load_bias += error - |
1172 | ELF_PAGESTART(load_bias + vaddr); | |
1da177e4 LT |
1173 | reloc_func_desc = load_bias; |
1174 | } | |
1175 | } | |
0da1d500 AK |
1176 | |
1177 | /* | |
1178 | * Figure out which segment in the file contains the Program | |
1179 | * Header table, and map to the associated memory address. | |
1180 | */ | |
1181 | if (elf_ppnt->p_offset <= elf_ex->e_phoff && | |
1182 | elf_ex->e_phoff < elf_ppnt->p_offset + elf_ppnt->p_filesz) { | |
1183 | phdr_addr = elf_ex->e_phoff - elf_ppnt->p_offset + | |
1184 | elf_ppnt->p_vaddr; | |
1185 | } | |
1186 | ||
1da177e4 | 1187 | k = elf_ppnt->p_vaddr; |
f67ef446 | 1188 | if ((elf_ppnt->p_flags & PF_X) && k < start_code) |
f4e5cc2c JJ |
1189 | start_code = k; |
1190 | if (start_data < k) | |
1191 | start_data = k; | |
1da177e4 LT |
1192 | |
1193 | /* | |
1194 | * Check to see if the section's size will overflow the | |
1195 | * allowed task size. Note that p_filesz must always be | |
1196 | * <= p_memsz so it is only necessary to check p_memsz. | |
1197 | */ | |
ce51059b | 1198 | if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz || |
1da177e4 LT |
1199 | elf_ppnt->p_memsz > TASK_SIZE || |
1200 | TASK_SIZE - elf_ppnt->p_memsz < k) { | |
f4e5cc2c | 1201 | /* set_brk can never work. Avoid overflows. */ |
b140f251 | 1202 | retval = -EINVAL; |
1da177e4 LT |
1203 | goto out_free_dentry; |
1204 | } | |
1205 | ||
1206 | k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; | |
1207 | ||
1208 | if (k > elf_bss) | |
1209 | elf_bss = k; | |
1210 | if ((elf_ppnt->p_flags & PF_X) && end_code < k) | |
1211 | end_code = k; | |
1212 | if (end_data < k) | |
1213 | end_data = k; | |
1214 | k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; | |
16e72e9b DV |
1215 | if (k > elf_brk) { |
1216 | bss_prot = elf_prot; | |
1da177e4 | 1217 | elf_brk = k; |
16e72e9b | 1218 | } |
1da177e4 LT |
1219 | } |
1220 | ||
a62c5b1b | 1221 | e_entry = elf_ex->e_entry + load_bias; |
0da1d500 | 1222 | phdr_addr += load_bias; |
1da177e4 LT |
1223 | elf_bss += load_bias; |
1224 | elf_brk += load_bias; | |
1225 | start_code += load_bias; | |
1226 | end_code += load_bias; | |
1227 | start_data += load_bias; | |
1228 | end_data += load_bias; | |
1229 | ||
1230 | /* Calling set_brk effectively mmaps the pages that we need | |
1231 | * for the bss and break sections. We must do this before | |
1232 | * mapping in the interpreter, to make sure it doesn't wind | |
1233 | * up getting placed where the bss needs to go. | |
1234 | */ | |
16e72e9b | 1235 | retval = set_brk(elf_bss, elf_brk, bss_prot); |
19d860a1 | 1236 | if (retval) |
1da177e4 | 1237 | goto out_free_dentry; |
6de50517 | 1238 | if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) { |
1da177e4 LT |
1239 | retval = -EFAULT; /* Nobody gets to see this, but.. */ |
1240 | goto out_free_dentry; | |
1241 | } | |
1242 | ||
cc338010 | 1243 | if (interpreter) { |
c69bcc93 | 1244 | elf_entry = load_elf_interp(interp_elf_ex, |
d20894a2 | 1245 | interpreter, |
fe0f6766 DM |
1246 | load_bias, interp_elf_phdata, |
1247 | &arch_state); | |
dc64cc12 | 1248 | if (!IS_ERR_VALUE(elf_entry)) { |
d20894a2 AK |
1249 | /* |
1250 | * load_elf_interp() returns relocation | |
1251 | * adjustment | |
1252 | */ | |
1253 | interp_load_addr = elf_entry; | |
c69bcc93 | 1254 | elf_entry += interp_elf_ex->e_entry; |
cc503c1b | 1255 | } |
1da177e4 | 1256 | if (BAD_ADDR(elf_entry)) { |
dc64cc12 | 1257 | retval = IS_ERR_VALUE(elf_entry) ? |
ce51059b | 1258 | (int)elf_entry : -EINVAL; |
1da177e4 LT |
1259 | goto out_free_dentry; |
1260 | } | |
1261 | reloc_func_desc = interp_load_addr; | |
1262 | ||
1263 | allow_write_access(interpreter); | |
1264 | fput(interpreter); | |
0693ffeb AD |
1265 | |
1266 | kfree(interp_elf_ex); | |
aa0d1564 | 1267 | kfree(interp_elf_phdata); |
1da177e4 | 1268 | } else { |
a62c5b1b | 1269 | elf_entry = e_entry; |
5342fba5 | 1270 | if (BAD_ADDR(elf_entry)) { |
ce51059b | 1271 | retval = -EINVAL; |
5342fba5 SS |
1272 | goto out_free_dentry; |
1273 | } | |
1da177e4 LT |
1274 | } |
1275 | ||
1276 | kfree(elf_phdata); | |
1277 | ||
1da177e4 LT |
1278 | set_binfmt(&elf_format); |
1279 | ||
547ee84c | 1280 | #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
9a29a671 | 1281 | retval = ARCH_SETUP_ADDITIONAL_PAGES(bprm, elf_ex, !!interpreter); |
19d860a1 | 1282 | if (retval < 0) |
18c8baff | 1283 | goto out; |
547ee84c BH |
1284 | #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */ |
1285 | ||
0da1d500 AK |
1286 | retval = create_elf_tables(bprm, elf_ex, interp_load_addr, |
1287 | e_entry, phdr_addr); | |
19d860a1 | 1288 | if (retval < 0) |
b6a2fea3 | 1289 | goto out; |
03c6d723 AD |
1290 | |
1291 | mm = current->mm; | |
1292 | mm->end_code = end_code; | |
1293 | mm->start_code = start_code; | |
1294 | mm->start_data = start_data; | |
1295 | mm->end_data = end_data; | |
1296 | mm->start_stack = bprm->p; | |
1da177e4 | 1297 | |
4471a675 | 1298 | if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) { |
bbdc6076 KC |
1299 | /* |
1300 | * For architectures with ELF randomization, when executing | |
1301 | * a loader directly (i.e. no interpreter listed in ELF | |
1302 | * headers), move the brk area out of the mmap region | |
1303 | * (since it grows up, and may collide early with the stack | |
1304 | * growing down), and into the unused ELF_ET_DYN_BASE region. | |
1305 | */ | |
7be3cb01 | 1306 | if (IS_ENABLED(CONFIG_ARCH_HAS_ELF_RANDOMIZE) && |
03c6d723 AD |
1307 | elf_ex->e_type == ET_DYN && !interpreter) { |
1308 | mm->brk = mm->start_brk = ELF_ET_DYN_BASE; | |
1309 | } | |
bbdc6076 | 1310 | |
03c6d723 | 1311 | mm->brk = mm->start_brk = arch_randomize_brk(mm); |
204db6ed | 1312 | #ifdef compat_brk_randomized |
4471a675 JK |
1313 | current->brk_randomized = 1; |
1314 | #endif | |
1315 | } | |
c1d171a0 | 1316 | |
1da177e4 LT |
1317 | if (current->personality & MMAP_PAGE_ZERO) { |
1318 | /* Why this, you ask??? Well SVr4 maps page 0 as read-only, | |
1319 | and some applications "depend" upon this behavior. | |
1320 | Since we do not have the power to recompile these, we | |
f4e5cc2c | 1321 | emulate the SVr4 behavior. Sigh. */ |
6be5ceb0 | 1322 | error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC, |
1da177e4 | 1323 | MAP_FIXED | MAP_PRIVATE, 0); |
1da177e4 LT |
1324 | } |
1325 | ||
249b08e4 | 1326 | regs = current_pt_regs(); |
1da177e4 LT |
1327 | #ifdef ELF_PLAT_INIT |
1328 | /* | |
1329 | * The ABI may specify that certain registers be set up in special | |
1330 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
1331 | * example. In addition, it may also specify (eg, PowerPC64 ELF) | |
1332 | * that the e_entry field is the address of the function descriptor | |
1333 | * for the startup routine, rather than the address of the startup | |
1334 | * routine itself. This macro performs whatever initialization to | |
1335 | * the regs structure is required as well as any relocations to the | |
1336 | * function descriptor entries when executing dynamically links apps. | |
1337 | */ | |
1338 | ELF_PLAT_INIT(regs, reloc_func_desc); | |
1339 | #endif | |
1340 | ||
b8383831 | 1341 | finalize_exec(bprm); |
bc3d7bf6 | 1342 | START_THREAD(elf_ex, regs, elf_entry, bprm->p); |
1da177e4 LT |
1343 | retval = 0; |
1344 | out: | |
1da177e4 LT |
1345 | return retval; |
1346 | ||
1347 | /* error cleanup */ | |
1348 | out_free_dentry: | |
0693ffeb | 1349 | kfree(interp_elf_ex); |
a9d9ef13 | 1350 | kfree(interp_elf_phdata); |
594d2a14 | 1351 | out_free_file: |
1da177e4 LT |
1352 | allow_write_access(interpreter); |
1353 | if (interpreter) | |
1354 | fput(interpreter); | |
1da177e4 LT |
1355 | out_free_ph: |
1356 | kfree(elf_phdata); | |
1357 | goto out; | |
1358 | } | |
1359 | ||
69369a70 | 1360 | #ifdef CONFIG_USELIB |
1da177e4 LT |
1361 | /* This is really simpleminded and specialized - we are loading an |
1362 | a.out library that is given an ELF header. */ | |
1da177e4 LT |
1363 | static int load_elf_library(struct file *file) |
1364 | { | |
1365 | struct elf_phdr *elf_phdata; | |
1366 | struct elf_phdr *eppnt; | |
1367 | unsigned long elf_bss, bss, len; | |
1368 | int retval, error, i, j; | |
1369 | struct elfhdr elf_ex; | |
1370 | ||
1371 | error = -ENOEXEC; | |
658c0335 AD |
1372 | retval = elf_read(file, &elf_ex, sizeof(elf_ex), 0); |
1373 | if (retval < 0) | |
1da177e4 LT |
1374 | goto out; |
1375 | ||
1376 | if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1377 | goto out; | |
1378 | ||
1379 | /* First of all, some simple consistency checks */ | |
1380 | if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 || | |
72c2d531 | 1381 | !elf_check_arch(&elf_ex) || !file->f_op->mmap) |
1da177e4 | 1382 | goto out; |
4755200b NP |
1383 | if (elf_check_fdpic(&elf_ex)) |
1384 | goto out; | |
1da177e4 LT |
1385 | |
1386 | /* Now read in all of the header information */ | |
1387 | ||
1388 | j = sizeof(struct elf_phdr) * elf_ex.e_phnum; | |
1389 | /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */ | |
1390 | ||
1391 | error = -ENOMEM; | |
1392 | elf_phdata = kmalloc(j, GFP_KERNEL); | |
1393 | if (!elf_phdata) | |
1394 | goto out; | |
1395 | ||
1396 | eppnt = elf_phdata; | |
1397 | error = -ENOEXEC; | |
658c0335 AD |
1398 | retval = elf_read(file, eppnt, j, elf_ex.e_phoff); |
1399 | if (retval < 0) | |
1da177e4 LT |
1400 | goto out_free_ph; |
1401 | ||
1402 | for (j = 0, i = 0; i<elf_ex.e_phnum; i++) | |
1403 | if ((eppnt + i)->p_type == PT_LOAD) | |
1404 | j++; | |
1405 | if (j != 1) | |
1406 | goto out_free_ph; | |
1407 | ||
1408 | while (eppnt->p_type != PT_LOAD) | |
1409 | eppnt++; | |
1410 | ||
1411 | /* Now use mmap to map the library into memory. */ | |
6be5ceb0 | 1412 | error = vm_mmap(file, |
1da177e4 LT |
1413 | ELF_PAGESTART(eppnt->p_vaddr), |
1414 | (eppnt->p_filesz + | |
1415 | ELF_PAGEOFFSET(eppnt->p_vaddr)), | |
1416 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
42be8b42 | 1417 | MAP_FIXED_NOREPLACE | MAP_PRIVATE, |
1da177e4 LT |
1418 | (eppnt->p_offset - |
1419 | ELF_PAGEOFFSET(eppnt->p_vaddr))); | |
1da177e4 LT |
1420 | if (error != ELF_PAGESTART(eppnt->p_vaddr)) |
1421 | goto out_free_ph; | |
1422 | ||
1423 | elf_bss = eppnt->p_vaddr + eppnt->p_filesz; | |
1424 | if (padzero(elf_bss)) { | |
1425 | error = -EFAULT; | |
1426 | goto out_free_ph; | |
1427 | } | |
1428 | ||
24962af7 OS |
1429 | len = ELF_PAGEALIGN(eppnt->p_filesz + eppnt->p_vaddr); |
1430 | bss = ELF_PAGEALIGN(eppnt->p_memsz + eppnt->p_vaddr); | |
ecc2bc8a MH |
1431 | if (bss > len) { |
1432 | error = vm_brk(len, bss - len); | |
5d22fc25 | 1433 | if (error) |
ecc2bc8a MH |
1434 | goto out_free_ph; |
1435 | } | |
1da177e4 LT |
1436 | error = 0; |
1437 | ||
1438 | out_free_ph: | |
1439 | kfree(elf_phdata); | |
1440 | out: | |
1441 | return error; | |
1442 | } | |
69369a70 | 1443 | #endif /* #ifdef CONFIG_USELIB */ |
1da177e4 | 1444 | |
698ba7b5 | 1445 | #ifdef CONFIG_ELF_CORE |
1da177e4 LT |
1446 | /* |
1447 | * ELF core dumper | |
1448 | * | |
1449 | * Modelled on fs/exec.c:aout_core_dump() | |
1450 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1451 | */ | |
1da177e4 | 1452 | |
1da177e4 LT |
1453 | /* An ELF note in memory */ |
1454 | struct memelfnote | |
1455 | { | |
1456 | const char *name; | |
1457 | int type; | |
1458 | unsigned int datasz; | |
1459 | void *data; | |
1460 | }; | |
1461 | ||
1462 | static int notesize(struct memelfnote *en) | |
1463 | { | |
1464 | int sz; | |
1465 | ||
1466 | sz = sizeof(struct elf_note); | |
1467 | sz += roundup(strlen(en->name) + 1, 4); | |
1468 | sz += roundup(en->datasz, 4); | |
1469 | ||
1470 | return sz; | |
1471 | } | |
1472 | ||
ecc8c772 | 1473 | static int writenote(struct memelfnote *men, struct coredump_params *cprm) |
d025c9db AK |
1474 | { |
1475 | struct elf_note en; | |
1da177e4 LT |
1476 | en.n_namesz = strlen(men->name) + 1; |
1477 | en.n_descsz = men->datasz; | |
1478 | en.n_type = men->type; | |
1479 | ||
ecc8c772 | 1480 | return dump_emit(cprm, &en, sizeof(en)) && |
22a8cb82 AV |
1481 | dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) && |
1482 | dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4); | |
1da177e4 | 1483 | } |
1da177e4 | 1484 | |
3aba481f | 1485 | static void fill_elf_header(struct elfhdr *elf, int segs, |
d3330cf0 | 1486 | u16 machine, u32 flags) |
1da177e4 | 1487 | { |
6970c8ef CG |
1488 | memset(elf, 0, sizeof(*elf)); |
1489 | ||
1da177e4 LT |
1490 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
1491 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1492 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1493 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1494 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1da177e4 LT |
1495 | |
1496 | elf->e_type = ET_CORE; | |
3aba481f | 1497 | elf->e_machine = machine; |
1da177e4 | 1498 | elf->e_version = EV_CURRENT; |
1da177e4 | 1499 | elf->e_phoff = sizeof(struct elfhdr); |
3aba481f | 1500 | elf->e_flags = flags; |
1da177e4 LT |
1501 | elf->e_ehsize = sizeof(struct elfhdr); |
1502 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1503 | elf->e_phnum = segs; | |
1da177e4 LT |
1504 | } |
1505 | ||
8d6b5eee | 1506 | static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1da177e4 LT |
1507 | { |
1508 | phdr->p_type = PT_NOTE; | |
1509 | phdr->p_offset = offset; | |
1510 | phdr->p_vaddr = 0; | |
1511 | phdr->p_paddr = 0; | |
1512 | phdr->p_filesz = sz; | |
1513 | phdr->p_memsz = 0; | |
1514 | phdr->p_flags = 0; | |
1515 | phdr->p_align = 0; | |
1da177e4 LT |
1516 | } |
1517 | ||
8f6e3f9e | 1518 | static void fill_note(struct memelfnote *note, const char *name, int type, |
1da177e4 LT |
1519 | unsigned int sz, void *data) |
1520 | { | |
1521 | note->name = name; | |
1522 | note->type = type; | |
1523 | note->datasz = sz; | |
1524 | note->data = data; | |
1da177e4 LT |
1525 | } |
1526 | ||
1527 | /* | |
f4e5cc2c JJ |
1528 | * fill up all the fields in prstatus from the given task struct, except |
1529 | * registers which need to be filled up separately. | |
1da177e4 | 1530 | */ |
f2485a2d | 1531 | static void fill_prstatus(struct elf_prstatus_common *prstatus, |
f4e5cc2c | 1532 | struct task_struct *p, long signr) |
1da177e4 LT |
1533 | { |
1534 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1535 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1536 | prstatus->pr_sighold = p->blocked.sig[0]; | |
3b34fc58 ON |
1537 | rcu_read_lock(); |
1538 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1539 | rcu_read_unlock(); | |
b488893a | 1540 | prstatus->pr_pid = task_pid_vnr(p); |
b488893a PE |
1541 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1542 | prstatus->pr_sid = task_session_vnr(p); | |
1da177e4 | 1543 | if (thread_group_leader(p)) { |
cd19c364 | 1544 | struct task_cputime cputime; |
f06febc9 | 1545 | |
1da177e4 | 1546 | /* |
f06febc9 FM |
1547 | * This is the record for the group leader. It shows the |
1548 | * group-wide total, not its individual thread total. | |
1da177e4 | 1549 | */ |
cd19c364 | 1550 | thread_group_cputime(p, &cputime); |
e2bb80d5 AB |
1551 | prstatus->pr_utime = ns_to_kernel_old_timeval(cputime.utime); |
1552 | prstatus->pr_stime = ns_to_kernel_old_timeval(cputime.stime); | |
1da177e4 | 1553 | } else { |
cd19c364 | 1554 | u64 utime, stime; |
6fac4829 | 1555 | |
cd19c364 | 1556 | task_cputime(p, &utime, &stime); |
e2bb80d5 AB |
1557 | prstatus->pr_utime = ns_to_kernel_old_timeval(utime); |
1558 | prstatus->pr_stime = ns_to_kernel_old_timeval(stime); | |
1da177e4 | 1559 | } |
5613fda9 | 1560 | |
e2bb80d5 AB |
1561 | prstatus->pr_cutime = ns_to_kernel_old_timeval(p->signal->cutime); |
1562 | prstatus->pr_cstime = ns_to_kernel_old_timeval(p->signal->cstime); | |
1da177e4 LT |
1563 | } |
1564 | ||
1565 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1566 | struct mm_struct *mm) | |
1567 | { | |
c69e8d9c | 1568 | const struct cred *cred; |
a84a5059 | 1569 | unsigned int i, len; |
2f064a59 PZ |
1570 | unsigned int state; |
1571 | ||
1da177e4 LT |
1572 | /* first copy the parameters from user space */ |
1573 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1574 | ||
1575 | len = mm->arg_end - mm->arg_start; | |
1576 | if (len >= ELF_PRARGSZ) | |
1577 | len = ELF_PRARGSZ-1; | |
1578 | if (copy_from_user(&psinfo->pr_psargs, | |
1579 | (const char __user *)mm->arg_start, len)) | |
1580 | return -EFAULT; | |
1581 | for(i = 0; i < len; i++) | |
1582 | if (psinfo->pr_psargs[i] == 0) | |
1583 | psinfo->pr_psargs[i] = ' '; | |
1584 | psinfo->pr_psargs[len] = 0; | |
1585 | ||
3b34fc58 ON |
1586 | rcu_read_lock(); |
1587 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1588 | rcu_read_unlock(); | |
b488893a | 1589 | psinfo->pr_pid = task_pid_vnr(p); |
b488893a PE |
1590 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1591 | psinfo->pr_sid = task_session_vnr(p); | |
1da177e4 | 1592 | |
2f064a59 PZ |
1593 | state = READ_ONCE(p->__state); |
1594 | i = state ? ffz(~state) + 1 : 0; | |
1da177e4 | 1595 | psinfo->pr_state = i; |
55148548 | 1596 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1da177e4 LT |
1597 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
1598 | psinfo->pr_nice = task_nice(p); | |
1599 | psinfo->pr_flag = p->flags; | |
c69e8d9c DH |
1600 | rcu_read_lock(); |
1601 | cred = __task_cred(p); | |
ebc887b2 EB |
1602 | SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); |
1603 | SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid)); | |
c69e8d9c | 1604 | rcu_read_unlock(); |
95af469c | 1605 | get_task_comm(psinfo->pr_fname, p); |
2f064a59 | 1606 | |
1da177e4 LT |
1607 | return 0; |
1608 | } | |
1609 | ||
3aba481f RM |
1610 | static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm) |
1611 | { | |
1612 | elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv; | |
1613 | int i = 0; | |
1614 | do | |
1615 | i += 2; | |
1616 | while (auxv[i - 2] != AT_NULL); | |
1617 | fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv); | |
1618 | } | |
1619 | ||
49ae4d4b | 1620 | static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata, |
ae7795bc | 1621 | const kernel_siginfo_t *siginfo) |
49ae4d4b | 1622 | { |
fa4751f4 | 1623 | copy_siginfo_to_external(csigdata, siginfo); |
49ae4d4b DV |
1624 | fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata); |
1625 | } | |
1626 | ||
2aa362c4 DV |
1627 | #define MAX_FILE_NOTE_SIZE (4*1024*1024) |
1628 | /* | |
1629 | * Format of NT_FILE note: | |
1630 | * | |
1631 | * long count -- how many files are mapped | |
1632 | * long page_size -- units for file_ofs | |
1633 | * array of [COUNT] elements of | |
1634 | * long start | |
1635 | * long end | |
1636 | * long file_ofs | |
1637 | * followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL... | |
1638 | */ | |
390031c9 | 1639 | static int fill_files_note(struct memelfnote *note, struct coredump_params *cprm) |
2aa362c4 | 1640 | { |
2aa362c4 DV |
1641 | unsigned count, size, names_ofs, remaining, n; |
1642 | user_long_t *data; | |
1643 | user_long_t *start_end_ofs; | |
1644 | char *name_base, *name_curpos; | |
390031c9 | 1645 | int i; |
2aa362c4 DV |
1646 | |
1647 | /* *Estimated* file count and total data size needed */ | |
390031c9 | 1648 | count = cprm->vma_count; |
60c9d92f AD |
1649 | if (count > UINT_MAX / 64) |
1650 | return -EINVAL; | |
2aa362c4 DV |
1651 | size = count * 64; |
1652 | ||
1653 | names_ofs = (2 + 3 * count) * sizeof(data[0]); | |
1654 | alloc: | |
1655 | if (size >= MAX_FILE_NOTE_SIZE) /* paranoia check */ | |
72023656 | 1656 | return -EINVAL; |
2aa362c4 | 1657 | size = round_up(size, PAGE_SIZE); |
1fbede6e AD |
1658 | /* |
1659 | * "size" can be 0 here legitimately. | |
1660 | * Let it ENOMEM and omit NT_FILE section which will be empty anyway. | |
1661 | */ | |
86a2bb5a AD |
1662 | data = kvmalloc(size, GFP_KERNEL); |
1663 | if (ZERO_OR_NULL_PTR(data)) | |
72023656 | 1664 | return -ENOMEM; |
2aa362c4 DV |
1665 | |
1666 | start_end_ofs = data + 2; | |
1667 | name_base = name_curpos = ((char *)data) + names_ofs; | |
1668 | remaining = size - names_ofs; | |
1669 | count = 0; | |
390031c9 EB |
1670 | for (i = 0; i < cprm->vma_count; i++) { |
1671 | struct core_vma_metadata *m = &cprm->vma_meta[i]; | |
2aa362c4 DV |
1672 | struct file *file; |
1673 | const char *filename; | |
1674 | ||
390031c9 | 1675 | file = m->file; |
2aa362c4 DV |
1676 | if (!file) |
1677 | continue; | |
9bf39ab2 | 1678 | filename = file_path(file, name_curpos, remaining); |
2aa362c4 DV |
1679 | if (IS_ERR(filename)) { |
1680 | if (PTR_ERR(filename) == -ENAMETOOLONG) { | |
86a2bb5a | 1681 | kvfree(data); |
2aa362c4 DV |
1682 | size = size * 5 / 4; |
1683 | goto alloc; | |
1684 | } | |
1685 | continue; | |
1686 | } | |
1687 | ||
9bf39ab2 | 1688 | /* file_path() fills at the end, move name down */ |
2aa362c4 DV |
1689 | /* n = strlen(filename) + 1: */ |
1690 | n = (name_curpos + remaining) - filename; | |
1691 | remaining = filename - name_curpos; | |
1692 | memmove(name_curpos, filename, n); | |
1693 | name_curpos += n; | |
1694 | ||
390031c9 EB |
1695 | *start_end_ofs++ = m->start; |
1696 | *start_end_ofs++ = m->end; | |
1697 | *start_end_ofs++ = m->pgoff; | |
2aa362c4 DV |
1698 | count++; |
1699 | } | |
1700 | ||
1701 | /* Now we know exact count of files, can store it */ | |
1702 | data[0] = count; | |
1703 | data[1] = PAGE_SIZE; | |
1704 | /* | |
03c6d723 | 1705 | * Count usually is less than mm->map_count, |
2aa362c4 DV |
1706 | * we need to move filenames down. |
1707 | */ | |
390031c9 | 1708 | n = cprm->vma_count - count; |
2aa362c4 DV |
1709 | if (n != 0) { |
1710 | unsigned shift_bytes = n * 3 * sizeof(data[0]); | |
1711 | memmove(name_base - shift_bytes, name_base, | |
1712 | name_curpos - name_base); | |
1713 | name_curpos -= shift_bytes; | |
1714 | } | |
1715 | ||
1716 | size = name_curpos - (char *)data; | |
1717 | fill_note(note, "CORE", NT_FILE, size, data); | |
72023656 | 1718 | return 0; |
2aa362c4 DV |
1719 | } |
1720 | ||
4206d3aa RM |
1721 | #include <linux/regset.h> |
1722 | ||
1723 | struct elf_thread_core_info { | |
1724 | struct elf_thread_core_info *next; | |
1725 | struct task_struct *task; | |
1726 | struct elf_prstatus prstatus; | |
5e01fdff | 1727 | struct memelfnote notes[]; |
4206d3aa RM |
1728 | }; |
1729 | ||
1730 | struct elf_note_info { | |
1731 | struct elf_thread_core_info *thread; | |
1732 | struct memelfnote psinfo; | |
49ae4d4b | 1733 | struct memelfnote signote; |
4206d3aa | 1734 | struct memelfnote auxv; |
2aa362c4 | 1735 | struct memelfnote files; |
49ae4d4b | 1736 | user_siginfo_t csigdata; |
4206d3aa RM |
1737 | size_t size; |
1738 | int thread_notes; | |
1739 | }; | |
1740 | ||
e92edb85 | 1741 | #ifdef CORE_DUMP_USE_REGSET |
d31472b6 RM |
1742 | /* |
1743 | * When a regset has a writeback hook, we call it on each thread before | |
1744 | * dumping user memory. On register window machines, this makes sure the | |
1745 | * user memory backing the register data is up to date before we read it. | |
1746 | */ | |
1747 | static void do_thread_regset_writeback(struct task_struct *task, | |
1748 | const struct user_regset *regset) | |
1749 | { | |
1750 | if (regset->writeback) | |
1751 | regset->writeback(task, regset, 1); | |
1752 | } | |
1753 | ||
0953f65d | 1754 | #ifndef PRSTATUS_SIZE |
8a00dd00 | 1755 | #define PRSTATUS_SIZE sizeof(struct elf_prstatus) |
0953f65d L |
1756 | #endif |
1757 | ||
1758 | #ifndef SET_PR_FPVALID | |
8a00dd00 | 1759 | #define SET_PR_FPVALID(S) ((S)->pr_fpvalid = 1) |
0953f65d L |
1760 | #endif |
1761 | ||
4206d3aa RM |
1762 | static int fill_thread_core_info(struct elf_thread_core_info *t, |
1763 | const struct user_regset_view *view, | |
dd664099 | 1764 | long signr, struct elf_note_info *info) |
4206d3aa | 1765 | { |
dd664099 | 1766 | unsigned int note_iter, view_iter; |
4206d3aa RM |
1767 | |
1768 | /* | |
1769 | * NT_PRSTATUS is the one special case, because the regset data | |
1770 | * goes into the pr_reg field inside the note contents, rather | |
1771 | * than being the whole note contents. We fill the reset in here. | |
1772 | * We assume that regset 0 is NT_PRSTATUS. | |
1773 | */ | |
f2485a2d | 1774 | fill_prstatus(&t->prstatus.common, t->task, signr); |
8a00dd00 | 1775 | regset_get(t->task, &view->regsets[0], |
b4e9c954 | 1776 | sizeof(t->prstatus.pr_reg), &t->prstatus.pr_reg); |
4206d3aa RM |
1777 | |
1778 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, | |
8a00dd00 | 1779 | PRSTATUS_SIZE, &t->prstatus); |
dd664099 | 1780 | info->size += notesize(&t->notes[0]); |
4206d3aa | 1781 | |
d31472b6 RM |
1782 | do_thread_regset_writeback(t->task, &view->regsets[0]); |
1783 | ||
4206d3aa RM |
1784 | /* |
1785 | * Each other regset might generate a note too. For each regset | |
dd664099 | 1786 | * that has no core_note_type or is inactive, skip it. |
4206d3aa | 1787 | */ |
dd664099 RE |
1788 | note_iter = 1; |
1789 | for (view_iter = 1; view_iter < view->n; ++view_iter) { | |
1790 | const struct user_regset *regset = &view->regsets[view_iter]; | |
b4e9c954 AV |
1791 | int note_type = regset->core_note_type; |
1792 | bool is_fpreg = note_type == NT_PRFPREG; | |
1793 | void *data; | |
1794 | int ret; | |
1795 | ||
d31472b6 | 1796 | do_thread_regset_writeback(t->task, regset); |
b4e9c954 AV |
1797 | if (!note_type) // not for coredumps |
1798 | continue; | |
1799 | if (regset->active && regset->active(t->task, regset) <= 0) | |
1800 | continue; | |
1801 | ||
1802 | ret = regset_get_alloc(t->task, regset, ~0U, &data); | |
1803 | if (ret < 0) | |
1804 | continue; | |
1805 | ||
dd664099 RE |
1806 | if (WARN_ON_ONCE(note_iter >= info->thread_notes)) |
1807 | break; | |
1808 | ||
b4e9c954 | 1809 | if (is_fpreg) |
8a00dd00 | 1810 | SET_PR_FPVALID(&t->prstatus); |
b4e9c954 | 1811 | |
dd664099 | 1812 | fill_note(&t->notes[note_iter], is_fpreg ? "CORE" : "LINUX", |
b4e9c954 AV |
1813 | note_type, ret, data); |
1814 | ||
dd664099 RE |
1815 | info->size += notesize(&t->notes[note_iter]); |
1816 | note_iter++; | |
4206d3aa RM |
1817 | } |
1818 | ||
1819 | return 1; | |
1820 | } | |
e92edb85 AV |
1821 | #else |
1822 | static int fill_thread_core_info(struct elf_thread_core_info *t, | |
1823 | const struct user_regset_view *view, | |
1824 | long signr, struct elf_note_info *info) | |
1825 | { | |
1826 | struct task_struct *p = t->task; | |
1827 | elf_fpregset_t *fpu; | |
1828 | ||
1829 | fill_prstatus(&t->prstatus.common, p, signr); | |
1830 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1831 | ||
1832 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), | |
1833 | &(t->prstatus)); | |
1834 | info->size += notesize(&t->notes[0]); | |
1835 | ||
1836 | fpu = kzalloc(sizeof(elf_fpregset_t), GFP_KERNEL); | |
1837 | if (!fpu || !elf_core_copy_task_fpregs(p, fpu)) { | |
1838 | kfree(fpu); | |
1839 | return 1; | |
1840 | } | |
1841 | ||
1842 | t->prstatus.pr_fpvalid = 1; | |
1843 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(*fpu), fpu); | |
1844 | info->size += notesize(&t->notes[1]); | |
1845 | ||
1846 | return 1; | |
1847 | } | |
1848 | #endif | |
4206d3aa RM |
1849 | |
1850 | static int fill_note_info(struct elfhdr *elf, int phdrs, | |
1851 | struct elf_note_info *info, | |
9ec7d323 | 1852 | struct coredump_params *cprm) |
4206d3aa RM |
1853 | { |
1854 | struct task_struct *dump_task = current; | |
e92edb85 | 1855 | const struct user_regset_view *view; |
4206d3aa RM |
1856 | struct elf_thread_core_info *t; |
1857 | struct elf_prpsinfo *psinfo; | |
83914441 | 1858 | struct core_thread *ct; |
4206d3aa RM |
1859 | |
1860 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
922ef161 | 1861 | if (!psinfo) |
4206d3aa | 1862 | return 0; |
e2dbe125 AW |
1863 | fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
1864 | ||
e92edb85 AV |
1865 | #ifdef CORE_DUMP_USE_REGSET |
1866 | view = task_user_regset_view(dump_task); | |
1867 | ||
4206d3aa RM |
1868 | /* |
1869 | * Figure out how many notes we're going to need for each thread. | |
1870 | */ | |
1871 | info->thread_notes = 0; | |
922ef161 | 1872 | for (int i = 0; i < view->n; ++i) |
4206d3aa RM |
1873 | if (view->regsets[i].core_note_type != 0) |
1874 | ++info->thread_notes; | |
1875 | ||
1876 | /* | |
1877 | * Sanity check. We rely on regset 0 being in NT_PRSTATUS, | |
1878 | * since it is our one special case. | |
1879 | */ | |
1880 | if (unlikely(info->thread_notes == 0) || | |
1881 | unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) { | |
1882 | WARN_ON(1); | |
1883 | return 0; | |
1884 | } | |
1885 | ||
1886 | /* | |
1887 | * Initialize the ELF file header. | |
1888 | */ | |
1889 | fill_elf_header(elf, phdrs, | |
d3330cf0 | 1890 | view->e_machine, view->e_flags); |
e92edb85 AV |
1891 | #else |
1892 | view = NULL; | |
1893 | info->thread_notes = 2; | |
1894 | fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS); | |
1895 | #endif | |
4206d3aa RM |
1896 | |
1897 | /* | |
1898 | * Allocate a structure for each thread. | |
1899 | */ | |
4b0e21d6 AV |
1900 | info->thread = kzalloc(offsetof(struct elf_thread_core_info, |
1901 | notes[info->thread_notes]), | |
1902 | GFP_KERNEL); | |
1903 | if (unlikely(!info->thread)) | |
1904 | return 0; | |
1905 | ||
1906 | info->thread->task = dump_task; | |
1907 | for (ct = dump_task->signal->core_state->dumper.next; ct; ct = ct->next) { | |
83914441 ON |
1908 | t = kzalloc(offsetof(struct elf_thread_core_info, |
1909 | notes[info->thread_notes]), | |
1910 | GFP_KERNEL); | |
1911 | if (unlikely(!t)) | |
1912 | return 0; | |
1913 | ||
1914 | t->task = ct->task; | |
4b0e21d6 AV |
1915 | t->next = info->thread->next; |
1916 | info->thread->next = t; | |
83914441 | 1917 | } |
4206d3aa RM |
1918 | |
1919 | /* | |
1920 | * Now fill in each thread's information. | |
1921 | */ | |
1922 | for (t = info->thread; t != NULL; t = t->next) | |
dd664099 | 1923 | if (!fill_thread_core_info(t, view, cprm->siginfo->si_signo, info)) |
4206d3aa RM |
1924 | return 0; |
1925 | ||
1926 | /* | |
1927 | * Fill in the two process-wide notes. | |
1928 | */ | |
1929 | fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm); | |
1930 | info->size += notesize(&info->psinfo); | |
1931 | ||
9ec7d323 | 1932 | fill_siginfo_note(&info->signote, &info->csigdata, cprm->siginfo); |
49ae4d4b DV |
1933 | info->size += notesize(&info->signote); |
1934 | ||
4206d3aa RM |
1935 | fill_auxv_note(&info->auxv, current->mm); |
1936 | info->size += notesize(&info->auxv); | |
1937 | ||
390031c9 | 1938 | if (fill_files_note(&info->files, cprm) == 0) |
72023656 | 1939 | info->size += notesize(&info->files); |
2aa362c4 | 1940 | |
4206d3aa RM |
1941 | return 1; |
1942 | } | |
1943 | ||
4206d3aa RM |
1944 | /* |
1945 | * Write all the notes for each thread. When writing the first thread, the | |
1946 | * process-wide notes are interleaved after the first thread-specific note. | |
1947 | */ | |
1948 | static int write_note_info(struct elf_note_info *info, | |
ecc8c772 | 1949 | struct coredump_params *cprm) |
4206d3aa | 1950 | { |
b219e25f | 1951 | bool first = true; |
4206d3aa RM |
1952 | struct elf_thread_core_info *t = info->thread; |
1953 | ||
1954 | do { | |
1955 | int i; | |
1956 | ||
ecc8c772 | 1957 | if (!writenote(&t->notes[0], cprm)) |
4206d3aa RM |
1958 | return 0; |
1959 | ||
ecc8c772 | 1960 | if (first && !writenote(&info->psinfo, cprm)) |
4206d3aa | 1961 | return 0; |
ecc8c772 | 1962 | if (first && !writenote(&info->signote, cprm)) |
49ae4d4b | 1963 | return 0; |
ecc8c772 | 1964 | if (first && !writenote(&info->auxv, cprm)) |
4206d3aa | 1965 | return 0; |
72023656 | 1966 | if (first && info->files.data && |
ecc8c772 | 1967 | !writenote(&info->files, cprm)) |
2aa362c4 | 1968 | return 0; |
4206d3aa RM |
1969 | |
1970 | for (i = 1; i < info->thread_notes; ++i) | |
1971 | if (t->notes[i].data && | |
ecc8c772 | 1972 | !writenote(&t->notes[i], cprm)) |
4206d3aa RM |
1973 | return 0; |
1974 | ||
b219e25f | 1975 | first = false; |
4206d3aa RM |
1976 | t = t->next; |
1977 | } while (t); | |
1978 | ||
1979 | return 1; | |
1980 | } | |
1981 | ||
1982 | static void free_note_info(struct elf_note_info *info) | |
1983 | { | |
1984 | struct elf_thread_core_info *threads = info->thread; | |
1985 | while (threads) { | |
1986 | unsigned int i; | |
1987 | struct elf_thread_core_info *t = threads; | |
1988 | threads = t->next; | |
1989 | WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus); | |
1990 | for (i = 1; i < info->thread_notes; ++i) | |
1991 | kfree(t->notes[i].data); | |
1992 | kfree(t); | |
1993 | } | |
1994 | kfree(info->psinfo.data); | |
86a2bb5a | 1995 | kvfree(info->files.data); |
4206d3aa RM |
1996 | } |
1997 | ||
8d9032bb DH |
1998 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
1999 | elf_addr_t e_shoff, int segs) | |
2000 | { | |
2001 | elf->e_shoff = e_shoff; | |
2002 | elf->e_shentsize = sizeof(*shdr4extnum); | |
2003 | elf->e_shnum = 1; | |
2004 | elf->e_shstrndx = SHN_UNDEF; | |
2005 | ||
2006 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); | |
2007 | ||
2008 | shdr4extnum->sh_type = SHT_NULL; | |
2009 | shdr4extnum->sh_size = elf->e_shnum; | |
2010 | shdr4extnum->sh_link = elf->e_shstrndx; | |
2011 | shdr4extnum->sh_info = segs; | |
2012 | } | |
2013 | ||
1da177e4 LT |
2014 | /* |
2015 | * Actual dumper | |
2016 | * | |
2017 | * This is a two-pass process; first we find the offsets of the bits, | |
2018 | * and then they are actually written out. If we run out of core limit | |
2019 | * we just truncate. | |
2020 | */ | |
f6151dfe | 2021 | static int elf_core_dump(struct coredump_params *cprm) |
1da177e4 | 2022 | { |
1da177e4 | 2023 | int has_dumped = 0; |
95c5436a | 2024 | int segs, i; |
225a3f53 | 2025 | struct elfhdr elf; |
cdc3d562 | 2026 | loff_t offset = 0, dataoff; |
72023656 | 2027 | struct elf_note_info info = { }; |
93eb211e | 2028 | struct elf_phdr *phdr4note = NULL; |
8d9032bb DH |
2029 | struct elf_shdr *shdr4extnum = NULL; |
2030 | Elf_Half e_phnum; | |
2031 | elf_addr_t e_shoff; | |
1da177e4 | 2032 | |
341c87bf KH |
2033 | /* |
2034 | * The number of segs are recored into ELF header as 16bit value. | |
2035 | * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here. | |
2036 | */ | |
95c5436a | 2037 | segs = cprm->vma_count + elf_core_extra_phdrs(); |
f47aef55 | 2038 | |
8d9032bb DH |
2039 | /* for notes section */ |
2040 | segs++; | |
2041 | ||
2042 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid | |
2043 | * this, kernel supports extended numbering. Have a look at | |
2044 | * include/linux/elf.h for further information. */ | |
2045 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; | |
2046 | ||
1da177e4 | 2047 | /* |
3aba481f RM |
2048 | * Collect all the non-memory information about the process for the |
2049 | * notes. This also sets up the file header. | |
1da177e4 | 2050 | */ |
9ec7d323 | 2051 | if (!fill_note_info(&elf, e_phnum, &info, cprm)) |
d2530b43 | 2052 | goto end_coredump; |
1da177e4 | 2053 | |
3aba481f | 2054 | has_dumped = 1; |
079148b9 | 2055 | |
225a3f53 | 2056 | offset += sizeof(elf); /* Elf header */ |
8d9032bb | 2057 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
1da177e4 LT |
2058 | |
2059 | /* Write notes phdr entry */ | |
2060 | { | |
38ba2f11 | 2061 | size_t sz = info.size; |
1da177e4 | 2062 | |
c39ab6de | 2063 | /* For cell spufs */ |
e5501492 | 2064 | sz += elf_coredump_extra_notes_size(); |
bf1ab978 | 2065 | |
93eb211e DH |
2066 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
2067 | if (!phdr4note) | |
088e7af7 | 2068 | goto end_coredump; |
93eb211e DH |
2069 | |
2070 | fill_elf_note_phdr(phdr4note, sz, offset); | |
2071 | offset += sz; | |
1da177e4 LT |
2072 | } |
2073 | ||
1da177e4 LT |
2074 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
2075 | ||
95c5436a | 2076 | offset += cprm->vma_data_size; |
8d9032bb DH |
2077 | offset += elf_core_extra_data_size(); |
2078 | e_shoff = offset; | |
2079 | ||
2080 | if (e_phnum == PN_XNUM) { | |
2081 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); | |
2082 | if (!shdr4extnum) | |
2083 | goto end_coredump; | |
225a3f53 | 2084 | fill_extnum_info(&elf, shdr4extnum, e_shoff, segs); |
8d9032bb DH |
2085 | } |
2086 | ||
2087 | offset = dataoff; | |
2088 | ||
225a3f53 | 2089 | if (!dump_emit(cprm, &elf, sizeof(elf))) |
93eb211e DH |
2090 | goto end_coredump; |
2091 | ||
ecc8c772 | 2092 | if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) |
93eb211e DH |
2093 | goto end_coredump; |
2094 | ||
1da177e4 | 2095 | /* Write program headers for segments dump */ |
95c5436a EB |
2096 | for (i = 0; i < cprm->vma_count; i++) { |
2097 | struct core_vma_metadata *meta = cprm->vma_meta + i; | |
1da177e4 | 2098 | struct elf_phdr phdr; |
1da177e4 LT |
2099 | |
2100 | phdr.p_type = PT_LOAD; | |
2101 | phdr.p_offset = offset; | |
a07279c9 | 2102 | phdr.p_vaddr = meta->start; |
1da177e4 | 2103 | phdr.p_paddr = 0; |
a07279c9 JH |
2104 | phdr.p_filesz = meta->dump_size; |
2105 | phdr.p_memsz = meta->end - meta->start; | |
1da177e4 | 2106 | offset += phdr.p_filesz; |
a07279c9 JH |
2107 | phdr.p_flags = 0; |
2108 | if (meta->flags & VM_READ) | |
2109 | phdr.p_flags |= PF_R; | |
2110 | if (meta->flags & VM_WRITE) | |
f4e5cc2c | 2111 | phdr.p_flags |= PF_W; |
a07279c9 | 2112 | if (meta->flags & VM_EXEC) |
f4e5cc2c | 2113 | phdr.p_flags |= PF_X; |
1da177e4 LT |
2114 | phdr.p_align = ELF_EXEC_PAGESIZE; |
2115 | ||
ecc8c772 | 2116 | if (!dump_emit(cprm, &phdr, sizeof(phdr))) |
088e7af7 | 2117 | goto end_coredump; |
1da177e4 LT |
2118 | } |
2119 | ||
506f21c5 | 2120 | if (!elf_core_write_extra_phdrs(cprm, offset)) |
1fcccbac | 2121 | goto end_coredump; |
1da177e4 | 2122 | |
8f6e3f9e | 2123 | /* write out the notes section */ |
ecc8c772 | 2124 | if (!write_note_info(&info, cprm)) |
3aba481f | 2125 | goto end_coredump; |
1da177e4 | 2126 | |
c39ab6de | 2127 | /* For cell spufs */ |
cdc3d562 | 2128 | if (elf_coredump_extra_notes_write(cprm)) |
e5501492 | 2129 | goto end_coredump; |
bf1ab978 | 2130 | |
d025c9db | 2131 | /* Align to page */ |
d0f1088b | 2132 | dump_skip_to(cprm, dataoff); |
1da177e4 | 2133 | |
95c5436a EB |
2134 | for (i = 0; i < cprm->vma_count; i++) { |
2135 | struct core_vma_metadata *meta = cprm->vma_meta + i; | |
a07279c9 JH |
2136 | |
2137 | if (!dump_user_range(cprm, meta->start, meta->dump_size)) | |
afc63a97 | 2138 | goto end_coredump; |
1da177e4 LT |
2139 | } |
2140 | ||
aa3e7eaf | 2141 | if (!elf_core_write_extra_data(cprm)) |
1fcccbac | 2142 | goto end_coredump; |
1da177e4 | 2143 | |
8d9032bb | 2144 | if (e_phnum == PN_XNUM) { |
13046ece | 2145 | if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) |
8d9032bb DH |
2146 | goto end_coredump; |
2147 | } | |
2148 | ||
1da177e4 | 2149 | end_coredump: |
3aba481f | 2150 | free_note_info(&info); |
8d9032bb | 2151 | kfree(shdr4extnum); |
93eb211e | 2152 | kfree(phdr4note); |
1da177e4 | 2153 | return has_dumped; |
1da177e4 LT |
2154 | } |
2155 | ||
698ba7b5 | 2156 | #endif /* CONFIG_ELF_CORE */ |
1da177e4 LT |
2157 | |
2158 | static int __init init_elf_binfmt(void) | |
2159 | { | |
8fc3dc5a AV |
2160 | register_binfmt(&elf_format); |
2161 | return 0; | |
1da177e4 LT |
2162 | } |
2163 | ||
2164 | static void __exit exit_elf_binfmt(void) | |
2165 | { | |
2166 | /* Remove the COFF and ELF loaders. */ | |
2167 | unregister_binfmt(&elf_format); | |
2168 | } | |
2169 | ||
2170 | core_initcall(init_elf_binfmt); | |
2171 | module_exit(exit_elf_binfmt); | |
2172 | MODULE_LICENSE("GPL"); | |
9e1a3ce0 KC |
2173 | |
2174 | #ifdef CONFIG_BINFMT_ELF_KUNIT_TEST | |
2175 | #include "binfmt_elf_test.c" | |
2176 | #endif |