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Commit | Line | Data |
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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> |
5b825c3a | 40 | #include <linux/cred.h> |
5037835c | 41 | #include <linux/dax.h> |
7c0f6ba6 | 42 | #include <linux/uaccess.h> |
1da177e4 LT |
43 | #include <asm/param.h> |
44 | #include <asm/page.h> | |
45 | ||
2aa362c4 DV |
46 | #ifndef user_long_t |
47 | #define user_long_t long | |
48 | #endif | |
49ae4d4b DV |
49 | #ifndef user_siginfo_t |
50 | #define user_siginfo_t siginfo_t | |
51 | #endif | |
52 | ||
71613c3b | 53 | static int load_elf_binary(struct linux_binprm *bprm); |
bb1ad820 AM |
54 | static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *, |
55 | int, int, unsigned long); | |
1da177e4 | 56 | |
69369a70 JT |
57 | #ifdef CONFIG_USELIB |
58 | static int load_elf_library(struct file *); | |
59 | #else | |
60 | #define load_elf_library NULL | |
61 | #endif | |
62 | ||
1da177e4 LT |
63 | /* |
64 | * If we don't support core dumping, then supply a NULL so we | |
65 | * don't even try. | |
66 | */ | |
698ba7b5 | 67 | #ifdef CONFIG_ELF_CORE |
f6151dfe | 68 | static int elf_core_dump(struct coredump_params *cprm); |
1da177e4 LT |
69 | #else |
70 | #define elf_core_dump NULL | |
71 | #endif | |
72 | ||
73 | #if ELF_EXEC_PAGESIZE > PAGE_SIZE | |
f4e5cc2c | 74 | #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE |
1da177e4 | 75 | #else |
f4e5cc2c | 76 | #define ELF_MIN_ALIGN PAGE_SIZE |
1da177e4 LT |
77 | #endif |
78 | ||
79 | #ifndef ELF_CORE_EFLAGS | |
80 | #define ELF_CORE_EFLAGS 0 | |
81 | #endif | |
82 | ||
83 | #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1)) | |
84 | #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1)) | |
85 | #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1)) | |
86 | ||
87 | static struct linux_binfmt elf_format = { | |
f670d0ec MP |
88 | .module = THIS_MODULE, |
89 | .load_binary = load_elf_binary, | |
90 | .load_shlib = load_elf_library, | |
91 | .core_dump = elf_core_dump, | |
92 | .min_coredump = ELF_EXEC_PAGESIZE, | |
1da177e4 LT |
93 | }; |
94 | ||
d4e3cc38 | 95 | #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE) |
1da177e4 | 96 | |
16e72e9b | 97 | static int set_brk(unsigned long start, unsigned long end, int prot) |
1da177e4 LT |
98 | { |
99 | start = ELF_PAGEALIGN(start); | |
100 | end = ELF_PAGEALIGN(end); | |
101 | if (end > start) { | |
16e72e9b DV |
102 | /* |
103 | * Map the last of the bss segment. | |
104 | * If the header is requesting these pages to be | |
105 | * executable, honour that (ppc32 needs this). | |
106 | */ | |
107 | int error = vm_brk_flags(start, end - start, | |
108 | prot & PROT_EXEC ? VM_EXEC : 0); | |
5d22fc25 LT |
109 | if (error) |
110 | return error; | |
1da177e4 LT |
111 | } |
112 | current->mm->start_brk = current->mm->brk = end; | |
113 | return 0; | |
114 | } | |
115 | ||
1da177e4 LT |
116 | /* We need to explicitly zero any fractional pages |
117 | after the data section (i.e. bss). This would | |
118 | contain the junk from the file that should not | |
f4e5cc2c JJ |
119 | be in memory |
120 | */ | |
1da177e4 LT |
121 | static int padzero(unsigned long elf_bss) |
122 | { | |
123 | unsigned long nbyte; | |
124 | ||
125 | nbyte = ELF_PAGEOFFSET(elf_bss); | |
126 | if (nbyte) { | |
127 | nbyte = ELF_MIN_ALIGN - nbyte; | |
128 | if (clear_user((void __user *) elf_bss, nbyte)) | |
129 | return -EFAULT; | |
130 | } | |
131 | return 0; | |
132 | } | |
133 | ||
09c6dd3c | 134 | /* Let's use some macros to make this stack manipulation a little clearer */ |
1da177e4 LT |
135 | #ifdef CONFIG_STACK_GROWSUP |
136 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items)) | |
137 | #define STACK_ROUND(sp, items) \ | |
138 | ((15 + (unsigned long) ((sp) + (items))) &~ 15UL) | |
f4e5cc2c JJ |
139 | #define STACK_ALLOC(sp, len) ({ \ |
140 | elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \ | |
141 | old_sp; }) | |
1da177e4 LT |
142 | #else |
143 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items)) | |
144 | #define STACK_ROUND(sp, items) \ | |
145 | (((unsigned long) (sp - items)) &~ 15UL) | |
146 | #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; }) | |
147 | #endif | |
148 | ||
483fad1c NL |
149 | #ifndef ELF_BASE_PLATFORM |
150 | /* | |
151 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. | |
152 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value | |
153 | * will be copied to the user stack in the same manner as AT_PLATFORM. | |
154 | */ | |
155 | #define ELF_BASE_PLATFORM NULL | |
156 | #endif | |
157 | ||
1da177e4 | 158 | static int |
f4e5cc2c | 159 | create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec, |
d20894a2 | 160 | unsigned long load_addr, unsigned long interp_load_addr) |
1da177e4 LT |
161 | { |
162 | unsigned long p = bprm->p; | |
163 | int argc = bprm->argc; | |
164 | int envc = bprm->envc; | |
165 | elf_addr_t __user *argv; | |
166 | elf_addr_t __user *envp; | |
167 | elf_addr_t __user *sp; | |
168 | elf_addr_t __user *u_platform; | |
483fad1c | 169 | elf_addr_t __user *u_base_platform; |
f06295b4 | 170 | elf_addr_t __user *u_rand_bytes; |
1da177e4 | 171 | const char *k_platform = ELF_PLATFORM; |
483fad1c | 172 | const char *k_base_platform = ELF_BASE_PLATFORM; |
f06295b4 | 173 | unsigned char k_rand_bytes[16]; |
1da177e4 LT |
174 | int items; |
175 | elf_addr_t *elf_info; | |
176 | int ei_index = 0; | |
86a264ab | 177 | const struct cred *cred = current_cred(); |
b6a2fea3 | 178 | struct vm_area_struct *vma; |
1da177e4 | 179 | |
d68c9d6a FBH |
180 | /* |
181 | * In some cases (e.g. Hyper-Threading), we want to avoid L1 | |
182 | * evictions by the processes running on the same package. One | |
183 | * thing we can do is to shuffle the initial stack for them. | |
184 | */ | |
185 | ||
186 | p = arch_align_stack(p); | |
187 | ||
1da177e4 LT |
188 | /* |
189 | * If this architecture has a platform capability string, copy it | |
190 | * to userspace. In some cases (Sparc), this info is impossible | |
191 | * for userspace to get any other way, in others (i386) it is | |
192 | * merely difficult. | |
193 | */ | |
1da177e4 LT |
194 | u_platform = NULL; |
195 | if (k_platform) { | |
196 | size_t len = strlen(k_platform) + 1; | |
197 | ||
1da177e4 LT |
198 | u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); |
199 | if (__copy_to_user(u_platform, k_platform, len)) | |
200 | return -EFAULT; | |
201 | } | |
202 | ||
483fad1c NL |
203 | /* |
204 | * If this architecture has a "base" platform capability | |
205 | * string, copy it to userspace. | |
206 | */ | |
207 | u_base_platform = NULL; | |
208 | if (k_base_platform) { | |
209 | size_t len = strlen(k_base_platform) + 1; | |
210 | ||
211 | u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); | |
212 | if (__copy_to_user(u_base_platform, k_base_platform, len)) | |
213 | return -EFAULT; | |
214 | } | |
215 | ||
f06295b4 KC |
216 | /* |
217 | * Generate 16 random bytes for userspace PRNG seeding. | |
218 | */ | |
219 | get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes)); | |
220 | u_rand_bytes = (elf_addr_t __user *) | |
221 | STACK_ALLOC(p, sizeof(k_rand_bytes)); | |
222 | if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes))) | |
223 | return -EFAULT; | |
224 | ||
1da177e4 | 225 | /* Create the ELF interpreter info */ |
785d5570 | 226 | elf_info = (elf_addr_t *)current->mm->saved_auxv; |
4f9a58d7 | 227 | /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */ |
1da177e4 | 228 | #define NEW_AUX_ENT(id, val) \ |
f4e5cc2c | 229 | do { \ |
785d5570 JJ |
230 | elf_info[ei_index++] = id; \ |
231 | elf_info[ei_index++] = val; \ | |
f4e5cc2c | 232 | } while (0) |
1da177e4 LT |
233 | |
234 | #ifdef ARCH_DLINFO | |
235 | /* | |
236 | * ARCH_DLINFO must come first so PPC can do its special alignment of | |
237 | * AUXV. | |
4f9a58d7 OH |
238 | * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in |
239 | * ARCH_DLINFO changes | |
1da177e4 LT |
240 | */ |
241 | ARCH_DLINFO; | |
242 | #endif | |
243 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); | |
244 | NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE); | |
245 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
246 | NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff); | |
f4e5cc2c | 247 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
1da177e4 LT |
248 | NEW_AUX_ENT(AT_PHNUM, exec->e_phnum); |
249 | NEW_AUX_ENT(AT_BASE, interp_load_addr); | |
250 | NEW_AUX_ENT(AT_FLAGS, 0); | |
251 | NEW_AUX_ENT(AT_ENTRY, exec->e_entry); | |
ebc887b2 EB |
252 | NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid)); |
253 | NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid)); | |
254 | NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid)); | |
255 | NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid)); | |
785d5570 | 256 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
f06295b4 | 257 | NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes); |
2171364d MN |
258 | #ifdef ELF_HWCAP2 |
259 | NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2); | |
260 | #endif | |
65191087 | 261 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
1da177e4 | 262 | if (k_platform) { |
f4e5cc2c | 263 | NEW_AUX_ENT(AT_PLATFORM, |
785d5570 | 264 | (elf_addr_t)(unsigned long)u_platform); |
1da177e4 | 265 | } |
483fad1c NL |
266 | if (k_base_platform) { |
267 | NEW_AUX_ENT(AT_BASE_PLATFORM, | |
268 | (elf_addr_t)(unsigned long)u_base_platform); | |
269 | } | |
1da177e4 | 270 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
785d5570 | 271 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); |
1da177e4 LT |
272 | } |
273 | #undef NEW_AUX_ENT | |
274 | /* AT_NULL is zero; clear the rest too */ | |
275 | memset(&elf_info[ei_index], 0, | |
276 | sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]); | |
277 | ||
278 | /* And advance past the AT_NULL entry. */ | |
279 | ei_index += 2; | |
280 | ||
281 | sp = STACK_ADD(p, ei_index); | |
282 | ||
d20894a2 | 283 | items = (argc + 1) + (envc + 1) + 1; |
1da177e4 LT |
284 | bprm->p = STACK_ROUND(sp, items); |
285 | ||
286 | /* Point sp at the lowest address on the stack */ | |
287 | #ifdef CONFIG_STACK_GROWSUP | |
288 | sp = (elf_addr_t __user *)bprm->p - items - ei_index; | |
f4e5cc2c | 289 | bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */ |
1da177e4 LT |
290 | #else |
291 | sp = (elf_addr_t __user *)bprm->p; | |
292 | #endif | |
293 | ||
b6a2fea3 OW |
294 | |
295 | /* | |
296 | * Grow the stack manually; some architectures have a limit on how | |
297 | * far ahead a user-space access may be in order to grow the stack. | |
298 | */ | |
299 | vma = find_extend_vma(current->mm, bprm->p); | |
300 | if (!vma) | |
301 | return -EFAULT; | |
302 | ||
1da177e4 LT |
303 | /* Now, let's put argc (and argv, envp if appropriate) on the stack */ |
304 | if (__put_user(argc, sp++)) | |
305 | return -EFAULT; | |
d20894a2 AK |
306 | argv = sp; |
307 | envp = argv + argc + 1; | |
1da177e4 LT |
308 | |
309 | /* Populate argv and envp */ | |
a84a5059 | 310 | p = current->mm->arg_end = current->mm->arg_start; |
1da177e4 LT |
311 | while (argc-- > 0) { |
312 | size_t len; | |
841d5fb7 HC |
313 | if (__put_user((elf_addr_t)p, argv++)) |
314 | return -EFAULT; | |
b6a2fea3 OW |
315 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
316 | if (!len || len > MAX_ARG_STRLEN) | |
23c4971e | 317 | return -EINVAL; |
1da177e4 LT |
318 | p += len; |
319 | } | |
320 | if (__put_user(0, argv)) | |
321 | return -EFAULT; | |
322 | current->mm->arg_end = current->mm->env_start = p; | |
323 | while (envc-- > 0) { | |
324 | size_t len; | |
841d5fb7 HC |
325 | if (__put_user((elf_addr_t)p, envp++)) |
326 | return -EFAULT; | |
b6a2fea3 OW |
327 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
328 | if (!len || len > MAX_ARG_STRLEN) | |
23c4971e | 329 | return -EINVAL; |
1da177e4 LT |
330 | p += len; |
331 | } | |
332 | if (__put_user(0, envp)) | |
333 | return -EFAULT; | |
334 | current->mm->env_end = p; | |
335 | ||
336 | /* Put the elf_info on the stack in the right place. */ | |
337 | sp = (elf_addr_t __user *)envp + 1; | |
338 | if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t))) | |
339 | return -EFAULT; | |
340 | return 0; | |
341 | } | |
342 | ||
c07380be JH |
343 | #ifndef elf_map |
344 | ||
1da177e4 | 345 | static unsigned long elf_map(struct file *filep, unsigned long addr, |
cc503c1b JK |
346 | struct elf_phdr *eppnt, int prot, int type, |
347 | unsigned long total_size) | |
1da177e4 LT |
348 | { |
349 | unsigned long map_addr; | |
cc503c1b JK |
350 | unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr); |
351 | unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr); | |
352 | addr = ELF_PAGESTART(addr); | |
353 | size = ELF_PAGEALIGN(size); | |
1da177e4 | 354 | |
dda6ebde DG |
355 | /* mmap() will return -EINVAL if given a zero size, but a |
356 | * segment with zero filesize is perfectly valid */ | |
cc503c1b JK |
357 | if (!size) |
358 | return addr; | |
359 | ||
cc503c1b JK |
360 | /* |
361 | * total_size is the size of the ELF (interpreter) image. | |
362 | * The _first_ mmap needs to know the full size, otherwise | |
363 | * randomization might put this image into an overlapping | |
364 | * position with the ELF binary image. (since size < total_size) | |
365 | * So we first map the 'big' image - and unmap the remainder at | |
366 | * the end. (which unmap is needed for ELF images with holes.) | |
367 | */ | |
368 | if (total_size) { | |
369 | total_size = ELF_PAGEALIGN(total_size); | |
5a5e4c2e | 370 | map_addr = vm_mmap(filep, addr, total_size, prot, type, off); |
cc503c1b | 371 | if (!BAD_ADDR(map_addr)) |
5a5e4c2e | 372 | vm_munmap(map_addr+size, total_size-size); |
cc503c1b | 373 | } else |
5a5e4c2e | 374 | map_addr = vm_mmap(filep, addr, size, prot, type, off); |
cc503c1b | 375 | |
1da177e4 LT |
376 | return(map_addr); |
377 | } | |
378 | ||
c07380be JH |
379 | #endif /* !elf_map */ |
380 | ||
cc503c1b JK |
381 | static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr) |
382 | { | |
383 | int i, first_idx = -1, last_idx = -1; | |
384 | ||
385 | for (i = 0; i < nr; i++) { | |
386 | if (cmds[i].p_type == PT_LOAD) { | |
387 | last_idx = i; | |
388 | if (first_idx == -1) | |
389 | first_idx = i; | |
390 | } | |
391 | } | |
392 | if (first_idx == -1) | |
393 | return 0; | |
394 | ||
395 | return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz - | |
396 | ELF_PAGESTART(cmds[first_idx].p_vaddr); | |
397 | } | |
398 | ||
6a8d3894 PB |
399 | /** |
400 | * load_elf_phdrs() - load ELF program headers | |
401 | * @elf_ex: ELF header of the binary whose program headers should be loaded | |
402 | * @elf_file: the opened ELF binary file | |
403 | * | |
404 | * Loads ELF program headers from the binary file elf_file, which has the ELF | |
405 | * header pointed to by elf_ex, into a newly allocated array. The caller is | |
406 | * responsible for freeing the allocated data. Returns an ERR_PTR upon failure. | |
407 | */ | |
408 | static struct elf_phdr *load_elf_phdrs(struct elfhdr *elf_ex, | |
409 | struct file *elf_file) | |
410 | { | |
411 | struct elf_phdr *elf_phdata = NULL; | |
412 | int retval, size, err = -1; | |
413 | ||
414 | /* | |
415 | * If the size of this structure has changed, then punt, since | |
416 | * we will be doing the wrong thing. | |
417 | */ | |
418 | if (elf_ex->e_phentsize != sizeof(struct elf_phdr)) | |
419 | goto out; | |
420 | ||
421 | /* Sanity check the number of program headers... */ | |
422 | if (elf_ex->e_phnum < 1 || | |
423 | elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr)) | |
424 | goto out; | |
425 | ||
426 | /* ...and their total size. */ | |
427 | size = sizeof(struct elf_phdr) * elf_ex->e_phnum; | |
428 | if (size > ELF_MIN_ALIGN) | |
429 | goto out; | |
430 | ||
431 | elf_phdata = kmalloc(size, GFP_KERNEL); | |
432 | if (!elf_phdata) | |
433 | goto out; | |
434 | ||
435 | /* Read in the program headers */ | |
436 | retval = kernel_read(elf_file, elf_ex->e_phoff, | |
437 | (char *)elf_phdata, size); | |
438 | if (retval != size) { | |
439 | err = (retval < 0) ? retval : -EIO; | |
440 | goto out; | |
441 | } | |
442 | ||
443 | /* Success! */ | |
444 | err = 0; | |
445 | out: | |
446 | if (err) { | |
447 | kfree(elf_phdata); | |
448 | elf_phdata = NULL; | |
449 | } | |
450 | return elf_phdata; | |
451 | } | |
cc503c1b | 452 | |
774c105e PB |
453 | #ifndef CONFIG_ARCH_BINFMT_ELF_STATE |
454 | ||
455 | /** | |
456 | * struct arch_elf_state - arch-specific ELF loading state | |
457 | * | |
458 | * This structure is used to preserve architecture specific data during | |
459 | * the loading of an ELF file, throughout the checking of architecture | |
460 | * specific ELF headers & through to the point where the ELF load is | |
461 | * known to be proceeding (ie. SET_PERSONALITY). | |
462 | * | |
463 | * This implementation is a dummy for architectures which require no | |
464 | * specific state. | |
465 | */ | |
466 | struct arch_elf_state { | |
467 | }; | |
468 | ||
469 | #define INIT_ARCH_ELF_STATE {} | |
470 | ||
471 | /** | |
472 | * arch_elf_pt_proc() - check a PT_LOPROC..PT_HIPROC ELF program header | |
473 | * @ehdr: The main ELF header | |
474 | * @phdr: The program header to check | |
475 | * @elf: The open ELF file | |
476 | * @is_interp: True if the phdr is from the interpreter of the ELF being | |
477 | * loaded, else false. | |
478 | * @state: Architecture-specific state preserved throughout the process | |
479 | * of loading the ELF. | |
480 | * | |
481 | * Inspects the program header phdr to validate its correctness and/or | |
482 | * suitability for the system. Called once per ELF program header in the | |
483 | * range PT_LOPROC to PT_HIPROC, for both the ELF being loaded and its | |
484 | * interpreter. | |
485 | * | |
486 | * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load | |
487 | * with that return code. | |
488 | */ | |
489 | static inline int arch_elf_pt_proc(struct elfhdr *ehdr, | |
490 | struct elf_phdr *phdr, | |
491 | struct file *elf, bool is_interp, | |
492 | struct arch_elf_state *state) | |
493 | { | |
494 | /* Dummy implementation, always proceed */ | |
495 | return 0; | |
496 | } | |
497 | ||
498 | /** | |
54d15714 | 499 | * arch_check_elf() - check an ELF executable |
774c105e PB |
500 | * @ehdr: The main ELF header |
501 | * @has_interp: True if the ELF has an interpreter, else false. | |
eb4bc076 | 502 | * @interp_ehdr: The interpreter's ELF header |
774c105e PB |
503 | * @state: Architecture-specific state preserved throughout the process |
504 | * of loading the ELF. | |
505 | * | |
506 | * Provides a final opportunity for architecture code to reject the loading | |
507 | * of the ELF & cause an exec syscall to return an error. This is called after | |
508 | * all program headers to be checked by arch_elf_pt_proc have been. | |
509 | * | |
510 | * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load | |
511 | * with that return code. | |
512 | */ | |
513 | static inline int arch_check_elf(struct elfhdr *ehdr, bool has_interp, | |
eb4bc076 | 514 | struct elfhdr *interp_ehdr, |
774c105e PB |
515 | struct arch_elf_state *state) |
516 | { | |
517 | /* Dummy implementation, always proceed */ | |
518 | return 0; | |
519 | } | |
520 | ||
521 | #endif /* !CONFIG_ARCH_BINFMT_ELF_STATE */ | |
cc503c1b | 522 | |
1da177e4 LT |
523 | /* This is much more generalized than the library routine read function, |
524 | so we keep this separate. Technically the library read function | |
525 | is only provided so that we can read a.out libraries that have | |
526 | an ELF header */ | |
527 | ||
f4e5cc2c | 528 | static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex, |
cc503c1b | 529 | struct file *interpreter, unsigned long *interp_map_addr, |
a9d9ef13 | 530 | unsigned long no_base, struct elf_phdr *interp_elf_phdata) |
1da177e4 | 531 | { |
1da177e4 LT |
532 | struct elf_phdr *eppnt; |
533 | unsigned long load_addr = 0; | |
534 | int load_addr_set = 0; | |
535 | unsigned long last_bss = 0, elf_bss = 0; | |
16e72e9b | 536 | int bss_prot = 0; |
1da177e4 | 537 | unsigned long error = ~0UL; |
cc503c1b | 538 | unsigned long total_size; |
6a8d3894 | 539 | int i; |
1da177e4 LT |
540 | |
541 | /* First of all, some simple consistency checks */ | |
542 | if (interp_elf_ex->e_type != ET_EXEC && | |
543 | interp_elf_ex->e_type != ET_DYN) | |
544 | goto out; | |
545 | if (!elf_check_arch(interp_elf_ex)) | |
546 | goto out; | |
72c2d531 | 547 | if (!interpreter->f_op->mmap) |
1da177e4 LT |
548 | goto out; |
549 | ||
a9d9ef13 PB |
550 | total_size = total_mapping_size(interp_elf_phdata, |
551 | interp_elf_ex->e_phnum); | |
cc503c1b JK |
552 | if (!total_size) { |
553 | error = -EINVAL; | |
a9d9ef13 | 554 | goto out; |
cc503c1b JK |
555 | } |
556 | ||
a9d9ef13 | 557 | eppnt = interp_elf_phdata; |
f4e5cc2c JJ |
558 | for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) { |
559 | if (eppnt->p_type == PT_LOAD) { | |
560 | int elf_type = MAP_PRIVATE | MAP_DENYWRITE; | |
561 | int elf_prot = 0; | |
562 | unsigned long vaddr = 0; | |
563 | unsigned long k, map_addr; | |
564 | ||
565 | if (eppnt->p_flags & PF_R) | |
566 | elf_prot = PROT_READ; | |
567 | if (eppnt->p_flags & PF_W) | |
568 | elf_prot |= PROT_WRITE; | |
569 | if (eppnt->p_flags & PF_X) | |
570 | elf_prot |= PROT_EXEC; | |
571 | vaddr = eppnt->p_vaddr; | |
572 | if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) | |
573 | elf_type |= MAP_FIXED; | |
cc503c1b JK |
574 | else if (no_base && interp_elf_ex->e_type == ET_DYN) |
575 | load_addr = -vaddr; | |
f4e5cc2c JJ |
576 | |
577 | map_addr = elf_map(interpreter, load_addr + vaddr, | |
bb1ad820 | 578 | eppnt, elf_prot, elf_type, total_size); |
cc503c1b JK |
579 | total_size = 0; |
580 | if (!*interp_map_addr) | |
581 | *interp_map_addr = map_addr; | |
f4e5cc2c JJ |
582 | error = map_addr; |
583 | if (BAD_ADDR(map_addr)) | |
a9d9ef13 | 584 | goto out; |
f4e5cc2c JJ |
585 | |
586 | if (!load_addr_set && | |
587 | interp_elf_ex->e_type == ET_DYN) { | |
588 | load_addr = map_addr - ELF_PAGESTART(vaddr); | |
589 | load_addr_set = 1; | |
590 | } | |
591 | ||
592 | /* | |
593 | * Check to see if the section's size will overflow the | |
594 | * allowed task size. Note that p_filesz must always be | |
595 | * <= p_memsize so it's only necessary to check p_memsz. | |
596 | */ | |
597 | k = load_addr + eppnt->p_vaddr; | |
ce51059b | 598 | if (BAD_ADDR(k) || |
f4e5cc2c JJ |
599 | eppnt->p_filesz > eppnt->p_memsz || |
600 | eppnt->p_memsz > TASK_SIZE || | |
601 | TASK_SIZE - eppnt->p_memsz < k) { | |
602 | error = -ENOMEM; | |
a9d9ef13 | 603 | goto out; |
f4e5cc2c JJ |
604 | } |
605 | ||
606 | /* | |
607 | * Find the end of the file mapping for this phdr, and | |
608 | * keep track of the largest address we see for this. | |
609 | */ | |
610 | k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; | |
611 | if (k > elf_bss) | |
612 | elf_bss = k; | |
613 | ||
614 | /* | |
615 | * Do the same thing for the memory mapping - between | |
616 | * elf_bss and last_bss is the bss section. | |
617 | */ | |
0036d1f7 | 618 | k = load_addr + eppnt->p_vaddr + eppnt->p_memsz; |
16e72e9b | 619 | if (k > last_bss) { |
f4e5cc2c | 620 | last_bss = k; |
16e72e9b DV |
621 | bss_prot = elf_prot; |
622 | } | |
f4e5cc2c | 623 | } |
1da177e4 LT |
624 | } |
625 | ||
0036d1f7 KC |
626 | /* |
627 | * Now fill out the bss section: first pad the last page from | |
628 | * the file up to the page boundary, and zero it from elf_bss | |
629 | * up to the end of the page. | |
630 | */ | |
631 | if (padzero(elf_bss)) { | |
632 | error = -EFAULT; | |
633 | goto out; | |
634 | } | |
635 | /* | |
636 | * Next, align both the file and mem bss up to the page size, | |
637 | * since this is where elf_bss was just zeroed up to, and where | |
16e72e9b | 638 | * last_bss will end after the vm_brk_flags() below. |
0036d1f7 KC |
639 | */ |
640 | elf_bss = ELF_PAGEALIGN(elf_bss); | |
641 | last_bss = ELF_PAGEALIGN(last_bss); | |
642 | /* Finally, if there is still more bss to allocate, do it. */ | |
752015d1 | 643 | if (last_bss > elf_bss) { |
16e72e9b DV |
644 | error = vm_brk_flags(elf_bss, last_bss - elf_bss, |
645 | bss_prot & PROT_EXEC ? VM_EXEC : 0); | |
5d22fc25 | 646 | if (error) |
a9d9ef13 | 647 | goto out; |
1da177e4 LT |
648 | } |
649 | ||
cc503c1b | 650 | error = load_addr; |
1da177e4 LT |
651 | out: |
652 | return error; | |
653 | } | |
654 | ||
1da177e4 LT |
655 | /* |
656 | * These are the functions used to load ELF style executables and shared | |
657 | * libraries. There is no binary dependent code anywhere else. | |
658 | */ | |
659 | ||
913bd906 | 660 | #ifndef STACK_RND_MASK |
d1cabd63 | 661 | #define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) /* 8MB of VA */ |
913bd906 | 662 | #endif |
1da177e4 LT |
663 | |
664 | static unsigned long randomize_stack_top(unsigned long stack_top) | |
665 | { | |
4e7c22d4 | 666 | unsigned long random_variable = 0; |
1da177e4 | 667 | |
c16b63e0 AK |
668 | if ((current->flags & PF_RANDOMIZE) && |
669 | !(current->personality & ADDR_NO_RANDOMIZE)) { | |
5ef11c35 | 670 | random_variable = get_random_long(); |
4e7c22d4 | 671 | random_variable &= STACK_RND_MASK; |
913bd906 AK |
672 | random_variable <<= PAGE_SHIFT; |
673 | } | |
1da177e4 | 674 | #ifdef CONFIG_STACK_GROWSUP |
913bd906 | 675 | return PAGE_ALIGN(stack_top) + random_variable; |
1da177e4 | 676 | #else |
913bd906 | 677 | return PAGE_ALIGN(stack_top) - random_variable; |
1da177e4 LT |
678 | #endif |
679 | } | |
680 | ||
71613c3b | 681 | static int load_elf_binary(struct linux_binprm *bprm) |
1da177e4 LT |
682 | { |
683 | struct file *interpreter = NULL; /* to shut gcc up */ | |
684 | unsigned long load_addr = 0, load_bias = 0; | |
685 | int load_addr_set = 0; | |
686 | char * elf_interpreter = NULL; | |
1da177e4 | 687 | unsigned long error; |
a9d9ef13 | 688 | struct elf_phdr *elf_ppnt, *elf_phdata, *interp_elf_phdata = NULL; |
1da177e4 | 689 | unsigned long elf_bss, elf_brk; |
16e72e9b | 690 | int bss_prot = 0; |
1da177e4 | 691 | int retval, i; |
cc503c1b JK |
692 | unsigned long elf_entry; |
693 | unsigned long interp_load_addr = 0; | |
1da177e4 | 694 | unsigned long start_code, end_code, start_data, end_data; |
1a530a6f | 695 | unsigned long reloc_func_desc __maybe_unused = 0; |
8de61e69 | 696 | int executable_stack = EXSTACK_DEFAULT; |
71613c3b | 697 | struct pt_regs *regs = current_pt_regs(); |
1da177e4 LT |
698 | struct { |
699 | struct elfhdr elf_ex; | |
700 | struct elfhdr interp_elf_ex; | |
1da177e4 | 701 | } *loc; |
774c105e | 702 | struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE; |
1da177e4 LT |
703 | |
704 | loc = kmalloc(sizeof(*loc), GFP_KERNEL); | |
705 | if (!loc) { | |
706 | retval = -ENOMEM; | |
707 | goto out_ret; | |
708 | } | |
709 | ||
710 | /* Get the exec-header */ | |
f4e5cc2c | 711 | loc->elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4 LT |
712 | |
713 | retval = -ENOEXEC; | |
714 | /* First of all, some simple consistency checks */ | |
715 | if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
716 | goto out; | |
717 | ||
718 | if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN) | |
719 | goto out; | |
720 | if (!elf_check_arch(&loc->elf_ex)) | |
721 | goto out; | |
72c2d531 | 722 | if (!bprm->file->f_op->mmap) |
1da177e4 LT |
723 | goto out; |
724 | ||
6a8d3894 | 725 | elf_phdata = load_elf_phdrs(&loc->elf_ex, bprm->file); |
1da177e4 LT |
726 | if (!elf_phdata) |
727 | goto out; | |
728 | ||
1da177e4 LT |
729 | elf_ppnt = elf_phdata; |
730 | elf_bss = 0; | |
731 | elf_brk = 0; | |
732 | ||
733 | start_code = ~0UL; | |
734 | end_code = 0; | |
735 | start_data = 0; | |
736 | end_data = 0; | |
737 | ||
738 | for (i = 0; i < loc->elf_ex.e_phnum; i++) { | |
739 | if (elf_ppnt->p_type == PT_INTERP) { | |
740 | /* This is the program interpreter used for | |
741 | * shared libraries - for now assume that this | |
742 | * is an a.out format binary | |
743 | */ | |
1da177e4 LT |
744 | retval = -ENOEXEC; |
745 | if (elf_ppnt->p_filesz > PATH_MAX || | |
746 | elf_ppnt->p_filesz < 2) | |
e7b9b550 | 747 | goto out_free_ph; |
1da177e4 LT |
748 | |
749 | retval = -ENOMEM; | |
792db3af | 750 | elf_interpreter = kmalloc(elf_ppnt->p_filesz, |
f4e5cc2c | 751 | GFP_KERNEL); |
1da177e4 | 752 | if (!elf_interpreter) |
e7b9b550 | 753 | goto out_free_ph; |
1da177e4 LT |
754 | |
755 | retval = kernel_read(bprm->file, elf_ppnt->p_offset, | |
f4e5cc2c JJ |
756 | elf_interpreter, |
757 | elf_ppnt->p_filesz); | |
1da177e4 LT |
758 | if (retval != elf_ppnt->p_filesz) { |
759 | if (retval >= 0) | |
760 | retval = -EIO; | |
761 | goto out_free_interp; | |
762 | } | |
763 | /* make sure path is NULL terminated */ | |
764 | retval = -ENOEXEC; | |
765 | if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0') | |
766 | goto out_free_interp; | |
767 | ||
1da177e4 LT |
768 | interpreter = open_exec(elf_interpreter); |
769 | retval = PTR_ERR(interpreter); | |
770 | if (IS_ERR(interpreter)) | |
771 | goto out_free_interp; | |
1fb84496 AD |
772 | |
773 | /* | |
774 | * If the binary is not readable then enforce | |
775 | * mm->dumpable = 0 regardless of the interpreter's | |
776 | * permissions. | |
777 | */ | |
1b5d783c | 778 | would_dump(bprm, interpreter); |
1fb84496 | 779 | |
b582ef5c MR |
780 | /* Get the exec headers */ |
781 | retval = kernel_read(interpreter, 0, | |
782 | (void *)&loc->interp_elf_ex, | |
783 | sizeof(loc->interp_elf_ex)); | |
784 | if (retval != sizeof(loc->interp_elf_ex)) { | |
1da177e4 LT |
785 | if (retval >= 0) |
786 | retval = -EIO; | |
787 | goto out_free_dentry; | |
788 | } | |
789 | ||
1da177e4 LT |
790 | break; |
791 | } | |
792 | elf_ppnt++; | |
793 | } | |
794 | ||
795 | elf_ppnt = elf_phdata; | |
796 | for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) | |
774c105e PB |
797 | switch (elf_ppnt->p_type) { |
798 | case PT_GNU_STACK: | |
1da177e4 LT |
799 | if (elf_ppnt->p_flags & PF_X) |
800 | executable_stack = EXSTACK_ENABLE_X; | |
801 | else | |
802 | executable_stack = EXSTACK_DISABLE_X; | |
803 | break; | |
774c105e PB |
804 | |
805 | case PT_LOPROC ... PT_HIPROC: | |
806 | retval = arch_elf_pt_proc(&loc->elf_ex, elf_ppnt, | |
807 | bprm->file, false, | |
808 | &arch_state); | |
809 | if (retval) | |
810 | goto out_free_dentry; | |
811 | break; | |
1da177e4 | 812 | } |
1da177e4 LT |
813 | |
814 | /* Some simple consistency checks for the interpreter */ | |
815 | if (elf_interpreter) { | |
1da177e4 | 816 | retval = -ELIBBAD; |
d20894a2 AK |
817 | /* Not an ELF interpreter */ |
818 | if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1da177e4 | 819 | goto out_free_dentry; |
1da177e4 | 820 | /* Verify the interpreter has a valid arch */ |
d20894a2 | 821 | if (!elf_check_arch(&loc->interp_elf_ex)) |
1da177e4 | 822 | goto out_free_dentry; |
a9d9ef13 PB |
823 | |
824 | /* Load the interpreter program headers */ | |
825 | interp_elf_phdata = load_elf_phdrs(&loc->interp_elf_ex, | |
826 | interpreter); | |
827 | if (!interp_elf_phdata) | |
828 | goto out_free_dentry; | |
774c105e PB |
829 | |
830 | /* Pass PT_LOPROC..PT_HIPROC headers to arch code */ | |
831 | elf_ppnt = interp_elf_phdata; | |
832 | for (i = 0; i < loc->interp_elf_ex.e_phnum; i++, elf_ppnt++) | |
833 | switch (elf_ppnt->p_type) { | |
834 | case PT_LOPROC ... PT_HIPROC: | |
835 | retval = arch_elf_pt_proc(&loc->interp_elf_ex, | |
836 | elf_ppnt, interpreter, | |
837 | true, &arch_state); | |
838 | if (retval) | |
839 | goto out_free_dentry; | |
840 | break; | |
841 | } | |
1da177e4 LT |
842 | } |
843 | ||
774c105e PB |
844 | /* |
845 | * Allow arch code to reject the ELF at this point, whilst it's | |
846 | * still possible to return an error to the code that invoked | |
847 | * the exec syscall. | |
848 | */ | |
eb4bc076 MR |
849 | retval = arch_check_elf(&loc->elf_ex, |
850 | !!interpreter, &loc->interp_elf_ex, | |
851 | &arch_state); | |
774c105e PB |
852 | if (retval) |
853 | goto out_free_dentry; | |
854 | ||
1da177e4 LT |
855 | /* Flush all traces of the currently running executable */ |
856 | retval = flush_old_exec(bprm); | |
857 | if (retval) | |
858 | goto out_free_dentry; | |
859 | ||
1da177e4 LT |
860 | /* Do this immediately, since STACK_TOP as used in setup_arg_pages |
861 | may depend on the personality. */ | |
774c105e | 862 | SET_PERSONALITY2(loc->elf_ex, &arch_state); |
1da177e4 LT |
863 | if (elf_read_implies_exec(loc->elf_ex, executable_stack)) |
864 | current->personality |= READ_IMPLIES_EXEC; | |
865 | ||
f4e5cc2c | 866 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
1da177e4 | 867 | current->flags |= PF_RANDOMIZE; |
221af7f8 LT |
868 | |
869 | setup_new_exec(bprm); | |
9f834ec1 | 870 | install_exec_creds(bprm); |
1da177e4 LT |
871 | |
872 | /* Do this so that we can load the interpreter, if need be. We will | |
873 | change some of these later */ | |
1da177e4 LT |
874 | retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP), |
875 | executable_stack); | |
19d860a1 | 876 | if (retval < 0) |
1da177e4 | 877 | goto out_free_dentry; |
1da177e4 | 878 | |
1da177e4 LT |
879 | current->mm->start_stack = bprm->p; |
880 | ||
af901ca1 | 881 | /* Now we do a little grungy work by mmapping the ELF image into |
cc503c1b | 882 | the correct location in memory. */ |
f4e5cc2c JJ |
883 | for(i = 0, elf_ppnt = elf_phdata; |
884 | i < loc->elf_ex.e_phnum; i++, elf_ppnt++) { | |
1da177e4 LT |
885 | int elf_prot = 0, elf_flags; |
886 | unsigned long k, vaddr; | |
a87938b2 | 887 | unsigned long total_size = 0; |
1da177e4 LT |
888 | |
889 | if (elf_ppnt->p_type != PT_LOAD) | |
890 | continue; | |
891 | ||
892 | if (unlikely (elf_brk > elf_bss)) { | |
893 | unsigned long nbyte; | |
894 | ||
895 | /* There was a PT_LOAD segment with p_memsz > p_filesz | |
896 | before this one. Map anonymous pages, if needed, | |
897 | and clear the area. */ | |
f670d0ec | 898 | retval = set_brk(elf_bss + load_bias, |
16e72e9b DV |
899 | elf_brk + load_bias, |
900 | bss_prot); | |
19d860a1 | 901 | if (retval) |
1da177e4 | 902 | goto out_free_dentry; |
1da177e4 LT |
903 | nbyte = ELF_PAGEOFFSET(elf_bss); |
904 | if (nbyte) { | |
905 | nbyte = ELF_MIN_ALIGN - nbyte; | |
906 | if (nbyte > elf_brk - elf_bss) | |
907 | nbyte = elf_brk - elf_bss; | |
908 | if (clear_user((void __user *)elf_bss + | |
909 | load_bias, nbyte)) { | |
910 | /* | |
911 | * This bss-zeroing can fail if the ELF | |
f4e5cc2c | 912 | * file specifies odd protections. So |
1da177e4 LT |
913 | * we don't check the return value |
914 | */ | |
915 | } | |
916 | } | |
917 | } | |
918 | ||
f4e5cc2c JJ |
919 | if (elf_ppnt->p_flags & PF_R) |
920 | elf_prot |= PROT_READ; | |
921 | if (elf_ppnt->p_flags & PF_W) | |
922 | elf_prot |= PROT_WRITE; | |
923 | if (elf_ppnt->p_flags & PF_X) | |
924 | elf_prot |= PROT_EXEC; | |
1da177e4 | 925 | |
f4e5cc2c | 926 | elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE; |
1da177e4 LT |
927 | |
928 | vaddr = elf_ppnt->p_vaddr; | |
929 | if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) { | |
930 | elf_flags |= MAP_FIXED; | |
931 | } else if (loc->elf_ex.e_type == ET_DYN) { | |
f4e5cc2c JJ |
932 | /* Try and get dynamic programs out of the way of the |
933 | * default mmap base, as well as whatever program they | |
934 | * might try to exec. This is because the brk will | |
935 | * follow the loader, and is not movable. */ | |
d1fd836d | 936 | load_bias = ELF_ET_DYN_BASE - vaddr; |
a3defbe5 | 937 | if (current->flags & PF_RANDOMIZE) |
d1fd836d KC |
938 | load_bias += arch_mmap_rnd(); |
939 | load_bias = ELF_PAGESTART(load_bias); | |
a87938b2 MD |
940 | total_size = total_mapping_size(elf_phdata, |
941 | loc->elf_ex.e_phnum); | |
942 | if (!total_size) { | |
2b1d3ae9 | 943 | retval = -EINVAL; |
a87938b2 MD |
944 | goto out_free_dentry; |
945 | } | |
1da177e4 LT |
946 | } |
947 | ||
f4e5cc2c | 948 | error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, |
a87938b2 | 949 | elf_prot, elf_flags, total_size); |
1da177e4 | 950 | if (BAD_ADDR(error)) { |
b140f251 AK |
951 | retval = IS_ERR((void *)error) ? |
952 | PTR_ERR((void*)error) : -EINVAL; | |
1da177e4 LT |
953 | goto out_free_dentry; |
954 | } | |
955 | ||
956 | if (!load_addr_set) { | |
957 | load_addr_set = 1; | |
958 | load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset); | |
959 | if (loc->elf_ex.e_type == ET_DYN) { | |
960 | load_bias += error - | |
961 | ELF_PAGESTART(load_bias + vaddr); | |
962 | load_addr += load_bias; | |
963 | reloc_func_desc = load_bias; | |
964 | } | |
965 | } | |
966 | k = elf_ppnt->p_vaddr; | |
f4e5cc2c JJ |
967 | if (k < start_code) |
968 | start_code = k; | |
969 | if (start_data < k) | |
970 | start_data = k; | |
1da177e4 LT |
971 | |
972 | /* | |
973 | * Check to see if the section's size will overflow the | |
974 | * allowed task size. Note that p_filesz must always be | |
975 | * <= p_memsz so it is only necessary to check p_memsz. | |
976 | */ | |
ce51059b | 977 | if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz || |
1da177e4 LT |
978 | elf_ppnt->p_memsz > TASK_SIZE || |
979 | TASK_SIZE - elf_ppnt->p_memsz < k) { | |
f4e5cc2c | 980 | /* set_brk can never work. Avoid overflows. */ |
b140f251 | 981 | retval = -EINVAL; |
1da177e4 LT |
982 | goto out_free_dentry; |
983 | } | |
984 | ||
985 | k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; | |
986 | ||
987 | if (k > elf_bss) | |
988 | elf_bss = k; | |
989 | if ((elf_ppnt->p_flags & PF_X) && end_code < k) | |
990 | end_code = k; | |
991 | if (end_data < k) | |
992 | end_data = k; | |
993 | k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; | |
16e72e9b DV |
994 | if (k > elf_brk) { |
995 | bss_prot = elf_prot; | |
1da177e4 | 996 | elf_brk = k; |
16e72e9b | 997 | } |
1da177e4 LT |
998 | } |
999 | ||
1000 | loc->elf_ex.e_entry += load_bias; | |
1001 | elf_bss += load_bias; | |
1002 | elf_brk += load_bias; | |
1003 | start_code += load_bias; | |
1004 | end_code += load_bias; | |
1005 | start_data += load_bias; | |
1006 | end_data += load_bias; | |
1007 | ||
1008 | /* Calling set_brk effectively mmaps the pages that we need | |
1009 | * for the bss and break sections. We must do this before | |
1010 | * mapping in the interpreter, to make sure it doesn't wind | |
1011 | * up getting placed where the bss needs to go. | |
1012 | */ | |
16e72e9b | 1013 | retval = set_brk(elf_bss, elf_brk, bss_prot); |
19d860a1 | 1014 | if (retval) |
1da177e4 | 1015 | goto out_free_dentry; |
6de50517 | 1016 | if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) { |
1da177e4 LT |
1017 | retval = -EFAULT; /* Nobody gets to see this, but.. */ |
1018 | goto out_free_dentry; | |
1019 | } | |
1020 | ||
1021 | if (elf_interpreter) { | |
6eec482f | 1022 | unsigned long interp_map_addr = 0; |
d20894a2 AK |
1023 | |
1024 | elf_entry = load_elf_interp(&loc->interp_elf_ex, | |
1025 | interpreter, | |
1026 | &interp_map_addr, | |
a9d9ef13 | 1027 | load_bias, interp_elf_phdata); |
d20894a2 AK |
1028 | if (!IS_ERR((void *)elf_entry)) { |
1029 | /* | |
1030 | * load_elf_interp() returns relocation | |
1031 | * adjustment | |
1032 | */ | |
1033 | interp_load_addr = elf_entry; | |
1034 | elf_entry += loc->interp_elf_ex.e_entry; | |
cc503c1b | 1035 | } |
1da177e4 | 1036 | if (BAD_ADDR(elf_entry)) { |
ce51059b CE |
1037 | retval = IS_ERR((void *)elf_entry) ? |
1038 | (int)elf_entry : -EINVAL; | |
1da177e4 LT |
1039 | goto out_free_dentry; |
1040 | } | |
1041 | reloc_func_desc = interp_load_addr; | |
1042 | ||
1043 | allow_write_access(interpreter); | |
1044 | fput(interpreter); | |
1045 | kfree(elf_interpreter); | |
1046 | } else { | |
1047 | elf_entry = loc->elf_ex.e_entry; | |
5342fba5 | 1048 | if (BAD_ADDR(elf_entry)) { |
ce51059b | 1049 | retval = -EINVAL; |
5342fba5 SS |
1050 | goto out_free_dentry; |
1051 | } | |
1da177e4 LT |
1052 | } |
1053 | ||
774c105e | 1054 | kfree(interp_elf_phdata); |
1da177e4 LT |
1055 | kfree(elf_phdata); |
1056 | ||
1da177e4 LT |
1057 | set_binfmt(&elf_format); |
1058 | ||
547ee84c | 1059 | #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
fc5243d9 | 1060 | retval = arch_setup_additional_pages(bprm, !!elf_interpreter); |
19d860a1 | 1061 | if (retval < 0) |
18c8baff | 1062 | goto out; |
547ee84c BH |
1063 | #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */ |
1064 | ||
b6a2fea3 | 1065 | retval = create_elf_tables(bprm, &loc->elf_ex, |
f4e5cc2c | 1066 | load_addr, interp_load_addr); |
19d860a1 | 1067 | if (retval < 0) |
b6a2fea3 | 1068 | goto out; |
1da177e4 | 1069 | /* N.B. passed_fileno might not be initialized? */ |
1da177e4 LT |
1070 | current->mm->end_code = end_code; |
1071 | current->mm->start_code = start_code; | |
1072 | current->mm->start_data = start_data; | |
1073 | current->mm->end_data = end_data; | |
1074 | current->mm->start_stack = bprm->p; | |
1075 | ||
4471a675 | 1076 | if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) { |
c1d171a0 JK |
1077 | current->mm->brk = current->mm->start_brk = |
1078 | arch_randomize_brk(current->mm); | |
204db6ed | 1079 | #ifdef compat_brk_randomized |
4471a675 JK |
1080 | current->brk_randomized = 1; |
1081 | #endif | |
1082 | } | |
c1d171a0 | 1083 | |
1da177e4 LT |
1084 | if (current->personality & MMAP_PAGE_ZERO) { |
1085 | /* Why this, you ask??? Well SVr4 maps page 0 as read-only, | |
1086 | and some applications "depend" upon this behavior. | |
1087 | Since we do not have the power to recompile these, we | |
f4e5cc2c | 1088 | emulate the SVr4 behavior. Sigh. */ |
6be5ceb0 | 1089 | error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC, |
1da177e4 | 1090 | MAP_FIXED | MAP_PRIVATE, 0); |
1da177e4 LT |
1091 | } |
1092 | ||
1093 | #ifdef ELF_PLAT_INIT | |
1094 | /* | |
1095 | * The ABI may specify that certain registers be set up in special | |
1096 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
1097 | * example. In addition, it may also specify (eg, PowerPC64 ELF) | |
1098 | * that the e_entry field is the address of the function descriptor | |
1099 | * for the startup routine, rather than the address of the startup | |
1100 | * routine itself. This macro performs whatever initialization to | |
1101 | * the regs structure is required as well as any relocations to the | |
1102 | * function descriptor entries when executing dynamically links apps. | |
1103 | */ | |
1104 | ELF_PLAT_INIT(regs, reloc_func_desc); | |
1105 | #endif | |
1106 | ||
1107 | start_thread(regs, elf_entry, bprm->p); | |
1da177e4 LT |
1108 | retval = 0; |
1109 | out: | |
1110 | kfree(loc); | |
1111 | out_ret: | |
1112 | return retval; | |
1113 | ||
1114 | /* error cleanup */ | |
1115 | out_free_dentry: | |
a9d9ef13 | 1116 | kfree(interp_elf_phdata); |
1da177e4 LT |
1117 | allow_write_access(interpreter); |
1118 | if (interpreter) | |
1119 | fput(interpreter); | |
1120 | out_free_interp: | |
f99d49ad | 1121 | kfree(elf_interpreter); |
1da177e4 LT |
1122 | out_free_ph: |
1123 | kfree(elf_phdata); | |
1124 | goto out; | |
1125 | } | |
1126 | ||
69369a70 | 1127 | #ifdef CONFIG_USELIB |
1da177e4 LT |
1128 | /* This is really simpleminded and specialized - we are loading an |
1129 | a.out library that is given an ELF header. */ | |
1da177e4 LT |
1130 | static int load_elf_library(struct file *file) |
1131 | { | |
1132 | struct elf_phdr *elf_phdata; | |
1133 | struct elf_phdr *eppnt; | |
1134 | unsigned long elf_bss, bss, len; | |
1135 | int retval, error, i, j; | |
1136 | struct elfhdr elf_ex; | |
1137 | ||
1138 | error = -ENOEXEC; | |
f4e5cc2c | 1139 | retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex)); |
1da177e4 LT |
1140 | if (retval != sizeof(elf_ex)) |
1141 | goto out; | |
1142 | ||
1143 | if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1144 | goto out; | |
1145 | ||
1146 | /* First of all, some simple consistency checks */ | |
1147 | if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 || | |
72c2d531 | 1148 | !elf_check_arch(&elf_ex) || !file->f_op->mmap) |
1da177e4 LT |
1149 | goto out; |
1150 | ||
1151 | /* Now read in all of the header information */ | |
1152 | ||
1153 | j = sizeof(struct elf_phdr) * elf_ex.e_phnum; | |
1154 | /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */ | |
1155 | ||
1156 | error = -ENOMEM; | |
1157 | elf_phdata = kmalloc(j, GFP_KERNEL); | |
1158 | if (!elf_phdata) | |
1159 | goto out; | |
1160 | ||
1161 | eppnt = elf_phdata; | |
1162 | error = -ENOEXEC; | |
1163 | retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j); | |
1164 | if (retval != j) | |
1165 | goto out_free_ph; | |
1166 | ||
1167 | for (j = 0, i = 0; i<elf_ex.e_phnum; i++) | |
1168 | if ((eppnt + i)->p_type == PT_LOAD) | |
1169 | j++; | |
1170 | if (j != 1) | |
1171 | goto out_free_ph; | |
1172 | ||
1173 | while (eppnt->p_type != PT_LOAD) | |
1174 | eppnt++; | |
1175 | ||
1176 | /* Now use mmap to map the library into memory. */ | |
6be5ceb0 | 1177 | error = vm_mmap(file, |
1da177e4 LT |
1178 | ELF_PAGESTART(eppnt->p_vaddr), |
1179 | (eppnt->p_filesz + | |
1180 | ELF_PAGEOFFSET(eppnt->p_vaddr)), | |
1181 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
1182 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, | |
1183 | (eppnt->p_offset - | |
1184 | ELF_PAGEOFFSET(eppnt->p_vaddr))); | |
1da177e4 LT |
1185 | if (error != ELF_PAGESTART(eppnt->p_vaddr)) |
1186 | goto out_free_ph; | |
1187 | ||
1188 | elf_bss = eppnt->p_vaddr + eppnt->p_filesz; | |
1189 | if (padzero(elf_bss)) { | |
1190 | error = -EFAULT; | |
1191 | goto out_free_ph; | |
1192 | } | |
1193 | ||
f4e5cc2c JJ |
1194 | len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + |
1195 | ELF_MIN_ALIGN - 1); | |
1da177e4 | 1196 | bss = eppnt->p_memsz + eppnt->p_vaddr; |
ecc2bc8a MH |
1197 | if (bss > len) { |
1198 | error = vm_brk(len, bss - len); | |
5d22fc25 | 1199 | if (error) |
ecc2bc8a MH |
1200 | goto out_free_ph; |
1201 | } | |
1da177e4 LT |
1202 | error = 0; |
1203 | ||
1204 | out_free_ph: | |
1205 | kfree(elf_phdata); | |
1206 | out: | |
1207 | return error; | |
1208 | } | |
69369a70 | 1209 | #endif /* #ifdef CONFIG_USELIB */ |
1da177e4 | 1210 | |
698ba7b5 | 1211 | #ifdef CONFIG_ELF_CORE |
1da177e4 LT |
1212 | /* |
1213 | * ELF core dumper | |
1214 | * | |
1215 | * Modelled on fs/exec.c:aout_core_dump() | |
1216 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1217 | */ | |
1da177e4 | 1218 | |
909af768 JB |
1219 | /* |
1220 | * The purpose of always_dump_vma() is to make sure that special kernel mappings | |
1221 | * that are useful for post-mortem analysis are included in every core dump. | |
1222 | * In that way we ensure that the core dump is fully interpretable later | |
1223 | * without matching up the same kernel and hardware config to see what PC values | |
1224 | * meant. These special mappings include - vDSO, vsyscall, and other | |
1225 | * architecture specific mappings | |
1226 | */ | |
1227 | static bool always_dump_vma(struct vm_area_struct *vma) | |
1228 | { | |
1229 | /* Any vsyscall mappings? */ | |
1230 | if (vma == get_gate_vma(vma->vm_mm)) | |
1231 | return true; | |
78d683e8 AL |
1232 | |
1233 | /* | |
1234 | * Assume that all vmas with a .name op should always be dumped. | |
1235 | * If this changes, a new vm_ops field can easily be added. | |
1236 | */ | |
1237 | if (vma->vm_ops && vma->vm_ops->name && vma->vm_ops->name(vma)) | |
1238 | return true; | |
1239 | ||
909af768 JB |
1240 | /* |
1241 | * arch_vma_name() returns non-NULL for special architecture mappings, | |
1242 | * such as vDSO sections. | |
1243 | */ | |
1244 | if (arch_vma_name(vma)) | |
1245 | return true; | |
1246 | ||
1247 | return false; | |
1248 | } | |
1249 | ||
1da177e4 | 1250 | /* |
82df3973 | 1251 | * Decide what to dump of a segment, part, all or none. |
1da177e4 | 1252 | */ |
82df3973 RM |
1253 | static unsigned long vma_dump_size(struct vm_area_struct *vma, |
1254 | unsigned long mm_flags) | |
1da177e4 | 1255 | { |
e575f111 KM |
1256 | #define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type)) |
1257 | ||
909af768 JB |
1258 | /* always dump the vdso and vsyscall sections */ |
1259 | if (always_dump_vma(vma)) | |
82df3973 | 1260 | goto whole; |
e5b97dde | 1261 | |
0103bd16 | 1262 | if (vma->vm_flags & VM_DONTDUMP) |
accb61fe JB |
1263 | return 0; |
1264 | ||
5037835c RZ |
1265 | /* support for DAX */ |
1266 | if (vma_is_dax(vma)) { | |
1267 | if ((vma->vm_flags & VM_SHARED) && FILTER(DAX_SHARED)) | |
1268 | goto whole; | |
1269 | if (!(vma->vm_flags & VM_SHARED) && FILTER(DAX_PRIVATE)) | |
1270 | goto whole; | |
1271 | return 0; | |
1272 | } | |
1273 | ||
e575f111 KM |
1274 | /* Hugetlb memory check */ |
1275 | if (vma->vm_flags & VM_HUGETLB) { | |
1276 | if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED)) | |
1277 | goto whole; | |
1278 | if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE)) | |
1279 | goto whole; | |
23d9e482 | 1280 | return 0; |
e575f111 KM |
1281 | } |
1282 | ||
1da177e4 | 1283 | /* Do not dump I/O mapped devices or special mappings */ |
314e51b9 | 1284 | if (vma->vm_flags & VM_IO) |
1da177e4 LT |
1285 | return 0; |
1286 | ||
a1b59e80 KH |
1287 | /* By default, dump shared memory if mapped from an anonymous file. */ |
1288 | if (vma->vm_flags & VM_SHARED) { | |
496ad9aa | 1289 | if (file_inode(vma->vm_file)->i_nlink == 0 ? |
82df3973 RM |
1290 | FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED)) |
1291 | goto whole; | |
1292 | return 0; | |
a1b59e80 | 1293 | } |
1da177e4 | 1294 | |
82df3973 RM |
1295 | /* Dump segments that have been written to. */ |
1296 | if (vma->anon_vma && FILTER(ANON_PRIVATE)) | |
1297 | goto whole; | |
1298 | if (vma->vm_file == NULL) | |
1299 | return 0; | |
1da177e4 | 1300 | |
82df3973 RM |
1301 | if (FILTER(MAPPED_PRIVATE)) |
1302 | goto whole; | |
1303 | ||
1304 | /* | |
1305 | * If this looks like the beginning of a DSO or executable mapping, | |
1306 | * check for an ELF header. If we find one, dump the first page to | |
1307 | * aid in determining what was mapped here. | |
1308 | */ | |
92dc07b1 RM |
1309 | if (FILTER(ELF_HEADERS) && |
1310 | vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) { | |
82df3973 RM |
1311 | u32 __user *header = (u32 __user *) vma->vm_start; |
1312 | u32 word; | |
92dc07b1 | 1313 | mm_segment_t fs = get_fs(); |
82df3973 RM |
1314 | /* |
1315 | * Doing it this way gets the constant folded by GCC. | |
1316 | */ | |
1317 | union { | |
1318 | u32 cmp; | |
1319 | char elfmag[SELFMAG]; | |
1320 | } magic; | |
1321 | BUILD_BUG_ON(SELFMAG != sizeof word); | |
1322 | magic.elfmag[EI_MAG0] = ELFMAG0; | |
1323 | magic.elfmag[EI_MAG1] = ELFMAG1; | |
1324 | magic.elfmag[EI_MAG2] = ELFMAG2; | |
1325 | magic.elfmag[EI_MAG3] = ELFMAG3; | |
92dc07b1 RM |
1326 | /* |
1327 | * Switch to the user "segment" for get_user(), | |
1328 | * then put back what elf_core_dump() had in place. | |
1329 | */ | |
1330 | set_fs(USER_DS); | |
1331 | if (unlikely(get_user(word, header))) | |
1332 | word = 0; | |
1333 | set_fs(fs); | |
1334 | if (word == magic.cmp) | |
82df3973 RM |
1335 | return PAGE_SIZE; |
1336 | } | |
1337 | ||
1338 | #undef FILTER | |
1339 | ||
1340 | return 0; | |
1341 | ||
1342 | whole: | |
1343 | return vma->vm_end - vma->vm_start; | |
1da177e4 LT |
1344 | } |
1345 | ||
1da177e4 LT |
1346 | /* An ELF note in memory */ |
1347 | struct memelfnote | |
1348 | { | |
1349 | const char *name; | |
1350 | int type; | |
1351 | unsigned int datasz; | |
1352 | void *data; | |
1353 | }; | |
1354 | ||
1355 | static int notesize(struct memelfnote *en) | |
1356 | { | |
1357 | int sz; | |
1358 | ||
1359 | sz = sizeof(struct elf_note); | |
1360 | sz += roundup(strlen(en->name) + 1, 4); | |
1361 | sz += roundup(en->datasz, 4); | |
1362 | ||
1363 | return sz; | |
1364 | } | |
1365 | ||
ecc8c772 | 1366 | static int writenote(struct memelfnote *men, struct coredump_params *cprm) |
d025c9db AK |
1367 | { |
1368 | struct elf_note en; | |
1da177e4 LT |
1369 | en.n_namesz = strlen(men->name) + 1; |
1370 | en.n_descsz = men->datasz; | |
1371 | en.n_type = men->type; | |
1372 | ||
ecc8c772 | 1373 | return dump_emit(cprm, &en, sizeof(en)) && |
22a8cb82 AV |
1374 | dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) && |
1375 | dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4); | |
1da177e4 | 1376 | } |
1da177e4 | 1377 | |
3aba481f | 1378 | static void fill_elf_header(struct elfhdr *elf, int segs, |
d3330cf0 | 1379 | u16 machine, u32 flags) |
1da177e4 | 1380 | { |
6970c8ef CG |
1381 | memset(elf, 0, sizeof(*elf)); |
1382 | ||
1da177e4 LT |
1383 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
1384 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1385 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1386 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1387 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1da177e4 LT |
1388 | |
1389 | elf->e_type = ET_CORE; | |
3aba481f | 1390 | elf->e_machine = machine; |
1da177e4 | 1391 | elf->e_version = EV_CURRENT; |
1da177e4 | 1392 | elf->e_phoff = sizeof(struct elfhdr); |
3aba481f | 1393 | elf->e_flags = flags; |
1da177e4 LT |
1394 | elf->e_ehsize = sizeof(struct elfhdr); |
1395 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1396 | elf->e_phnum = segs; | |
6970c8ef | 1397 | |
1da177e4 LT |
1398 | return; |
1399 | } | |
1400 | ||
8d6b5eee | 1401 | static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1da177e4 LT |
1402 | { |
1403 | phdr->p_type = PT_NOTE; | |
1404 | phdr->p_offset = offset; | |
1405 | phdr->p_vaddr = 0; | |
1406 | phdr->p_paddr = 0; | |
1407 | phdr->p_filesz = sz; | |
1408 | phdr->p_memsz = 0; | |
1409 | phdr->p_flags = 0; | |
1410 | phdr->p_align = 0; | |
1411 | return; | |
1412 | } | |
1413 | ||
1414 | static void fill_note(struct memelfnote *note, const char *name, int type, | |
1415 | unsigned int sz, void *data) | |
1416 | { | |
1417 | note->name = name; | |
1418 | note->type = type; | |
1419 | note->datasz = sz; | |
1420 | note->data = data; | |
1421 | return; | |
1422 | } | |
1423 | ||
1424 | /* | |
f4e5cc2c JJ |
1425 | * fill up all the fields in prstatus from the given task struct, except |
1426 | * registers which need to be filled up separately. | |
1da177e4 LT |
1427 | */ |
1428 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
f4e5cc2c | 1429 | struct task_struct *p, long signr) |
1da177e4 LT |
1430 | { |
1431 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1432 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1433 | prstatus->pr_sighold = p->blocked.sig[0]; | |
3b34fc58 ON |
1434 | rcu_read_lock(); |
1435 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1436 | rcu_read_unlock(); | |
b488893a | 1437 | prstatus->pr_pid = task_pid_vnr(p); |
b488893a PE |
1438 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1439 | prstatus->pr_sid = task_session_vnr(p); | |
1da177e4 | 1440 | if (thread_group_leader(p)) { |
cd19c364 | 1441 | struct task_cputime cputime; |
f06febc9 | 1442 | |
1da177e4 | 1443 | /* |
f06febc9 FM |
1444 | * This is the record for the group leader. It shows the |
1445 | * group-wide total, not its individual thread total. | |
1da177e4 | 1446 | */ |
cd19c364 FW |
1447 | thread_group_cputime(p, &cputime); |
1448 | prstatus->pr_utime = ns_to_timeval(cputime.utime); | |
1449 | prstatus->pr_stime = ns_to_timeval(cputime.stime); | |
1da177e4 | 1450 | } else { |
cd19c364 | 1451 | u64 utime, stime; |
6fac4829 | 1452 | |
cd19c364 FW |
1453 | task_cputime(p, &utime, &stime); |
1454 | prstatus->pr_utime = ns_to_timeval(utime); | |
1455 | prstatus->pr_stime = ns_to_timeval(stime); | |
1da177e4 | 1456 | } |
5613fda9 | 1457 | |
cd19c364 FW |
1458 | prstatus->pr_cutime = ns_to_timeval(p->signal->cutime); |
1459 | prstatus->pr_cstime = ns_to_timeval(p->signal->cstime); | |
1da177e4 LT |
1460 | } |
1461 | ||
1462 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1463 | struct mm_struct *mm) | |
1464 | { | |
c69e8d9c | 1465 | const struct cred *cred; |
a84a5059 | 1466 | unsigned int i, len; |
1da177e4 LT |
1467 | |
1468 | /* first copy the parameters from user space */ | |
1469 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1470 | ||
1471 | len = mm->arg_end - mm->arg_start; | |
1472 | if (len >= ELF_PRARGSZ) | |
1473 | len = ELF_PRARGSZ-1; | |
1474 | if (copy_from_user(&psinfo->pr_psargs, | |
1475 | (const char __user *)mm->arg_start, len)) | |
1476 | return -EFAULT; | |
1477 | for(i = 0; i < len; i++) | |
1478 | if (psinfo->pr_psargs[i] == 0) | |
1479 | psinfo->pr_psargs[i] = ' '; | |
1480 | psinfo->pr_psargs[len] = 0; | |
1481 | ||
3b34fc58 ON |
1482 | rcu_read_lock(); |
1483 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1484 | rcu_read_unlock(); | |
b488893a | 1485 | psinfo->pr_pid = task_pid_vnr(p); |
b488893a PE |
1486 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1487 | psinfo->pr_sid = task_session_vnr(p); | |
1da177e4 LT |
1488 | |
1489 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1490 | psinfo->pr_state = i; | |
55148548 | 1491 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1da177e4 LT |
1492 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
1493 | psinfo->pr_nice = task_nice(p); | |
1494 | psinfo->pr_flag = p->flags; | |
c69e8d9c DH |
1495 | rcu_read_lock(); |
1496 | cred = __task_cred(p); | |
ebc887b2 EB |
1497 | SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); |
1498 | SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid)); | |
c69e8d9c | 1499 | rcu_read_unlock(); |
1da177e4 LT |
1500 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1501 | ||
1502 | return 0; | |
1503 | } | |
1504 | ||
3aba481f RM |
1505 | static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm) |
1506 | { | |
1507 | elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv; | |
1508 | int i = 0; | |
1509 | do | |
1510 | i += 2; | |
1511 | while (auxv[i - 2] != AT_NULL); | |
1512 | fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv); | |
1513 | } | |
1514 | ||
49ae4d4b | 1515 | static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata, |
ce395960 | 1516 | const siginfo_t *siginfo) |
49ae4d4b DV |
1517 | { |
1518 | mm_segment_t old_fs = get_fs(); | |
1519 | set_fs(KERNEL_DS); | |
1520 | copy_siginfo_to_user((user_siginfo_t __user *) csigdata, siginfo); | |
1521 | set_fs(old_fs); | |
1522 | fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata); | |
1523 | } | |
1524 | ||
2aa362c4 DV |
1525 | #define MAX_FILE_NOTE_SIZE (4*1024*1024) |
1526 | /* | |
1527 | * Format of NT_FILE note: | |
1528 | * | |
1529 | * long count -- how many files are mapped | |
1530 | * long page_size -- units for file_ofs | |
1531 | * array of [COUNT] elements of | |
1532 | * long start | |
1533 | * long end | |
1534 | * long file_ofs | |
1535 | * followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL... | |
1536 | */ | |
72023656 | 1537 | static int fill_files_note(struct memelfnote *note) |
2aa362c4 DV |
1538 | { |
1539 | struct vm_area_struct *vma; | |
1540 | unsigned count, size, names_ofs, remaining, n; | |
1541 | user_long_t *data; | |
1542 | user_long_t *start_end_ofs; | |
1543 | char *name_base, *name_curpos; | |
1544 | ||
1545 | /* *Estimated* file count and total data size needed */ | |
1546 | count = current->mm->map_count; | |
1547 | size = count * 64; | |
1548 | ||
1549 | names_ofs = (2 + 3 * count) * sizeof(data[0]); | |
1550 | alloc: | |
1551 | if (size >= MAX_FILE_NOTE_SIZE) /* paranoia check */ | |
72023656 | 1552 | return -EINVAL; |
2aa362c4 DV |
1553 | size = round_up(size, PAGE_SIZE); |
1554 | data = vmalloc(size); | |
1555 | if (!data) | |
72023656 | 1556 | return -ENOMEM; |
2aa362c4 DV |
1557 | |
1558 | start_end_ofs = data + 2; | |
1559 | name_base = name_curpos = ((char *)data) + names_ofs; | |
1560 | remaining = size - names_ofs; | |
1561 | count = 0; | |
1562 | for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) { | |
1563 | struct file *file; | |
1564 | const char *filename; | |
1565 | ||
1566 | file = vma->vm_file; | |
1567 | if (!file) | |
1568 | continue; | |
9bf39ab2 | 1569 | filename = file_path(file, name_curpos, remaining); |
2aa362c4 DV |
1570 | if (IS_ERR(filename)) { |
1571 | if (PTR_ERR(filename) == -ENAMETOOLONG) { | |
1572 | vfree(data); | |
1573 | size = size * 5 / 4; | |
1574 | goto alloc; | |
1575 | } | |
1576 | continue; | |
1577 | } | |
1578 | ||
9bf39ab2 | 1579 | /* file_path() fills at the end, move name down */ |
2aa362c4 DV |
1580 | /* n = strlen(filename) + 1: */ |
1581 | n = (name_curpos + remaining) - filename; | |
1582 | remaining = filename - name_curpos; | |
1583 | memmove(name_curpos, filename, n); | |
1584 | name_curpos += n; | |
1585 | ||
1586 | *start_end_ofs++ = vma->vm_start; | |
1587 | *start_end_ofs++ = vma->vm_end; | |
1588 | *start_end_ofs++ = vma->vm_pgoff; | |
1589 | count++; | |
1590 | } | |
1591 | ||
1592 | /* Now we know exact count of files, can store it */ | |
1593 | data[0] = count; | |
1594 | data[1] = PAGE_SIZE; | |
1595 | /* | |
1596 | * Count usually is less than current->mm->map_count, | |
1597 | * we need to move filenames down. | |
1598 | */ | |
1599 | n = current->mm->map_count - count; | |
1600 | if (n != 0) { | |
1601 | unsigned shift_bytes = n * 3 * sizeof(data[0]); | |
1602 | memmove(name_base - shift_bytes, name_base, | |
1603 | name_curpos - name_base); | |
1604 | name_curpos -= shift_bytes; | |
1605 | } | |
1606 | ||
1607 | size = name_curpos - (char *)data; | |
1608 | fill_note(note, "CORE", NT_FILE, size, data); | |
72023656 | 1609 | return 0; |
2aa362c4 DV |
1610 | } |
1611 | ||
4206d3aa RM |
1612 | #ifdef CORE_DUMP_USE_REGSET |
1613 | #include <linux/regset.h> | |
1614 | ||
1615 | struct elf_thread_core_info { | |
1616 | struct elf_thread_core_info *next; | |
1617 | struct task_struct *task; | |
1618 | struct elf_prstatus prstatus; | |
1619 | struct memelfnote notes[0]; | |
1620 | }; | |
1621 | ||
1622 | struct elf_note_info { | |
1623 | struct elf_thread_core_info *thread; | |
1624 | struct memelfnote psinfo; | |
49ae4d4b | 1625 | struct memelfnote signote; |
4206d3aa | 1626 | struct memelfnote auxv; |
2aa362c4 | 1627 | struct memelfnote files; |
49ae4d4b | 1628 | user_siginfo_t csigdata; |
4206d3aa RM |
1629 | size_t size; |
1630 | int thread_notes; | |
1631 | }; | |
1632 | ||
d31472b6 RM |
1633 | /* |
1634 | * When a regset has a writeback hook, we call it on each thread before | |
1635 | * dumping user memory. On register window machines, this makes sure the | |
1636 | * user memory backing the register data is up to date before we read it. | |
1637 | */ | |
1638 | static void do_thread_regset_writeback(struct task_struct *task, | |
1639 | const struct user_regset *regset) | |
1640 | { | |
1641 | if (regset->writeback) | |
1642 | regset->writeback(task, regset, 1); | |
1643 | } | |
1644 | ||
0953f65d | 1645 | #ifndef PRSTATUS_SIZE |
90954e7b | 1646 | #define PRSTATUS_SIZE(S, R) sizeof(S) |
0953f65d L |
1647 | #endif |
1648 | ||
1649 | #ifndef SET_PR_FPVALID | |
90954e7b | 1650 | #define SET_PR_FPVALID(S, V, R) ((S)->pr_fpvalid = (V)) |
0953f65d L |
1651 | #endif |
1652 | ||
4206d3aa RM |
1653 | static int fill_thread_core_info(struct elf_thread_core_info *t, |
1654 | const struct user_regset_view *view, | |
1655 | long signr, size_t *total) | |
1656 | { | |
1657 | unsigned int i; | |
90954e7b | 1658 | unsigned int regset_size = view->regsets[0].n * view->regsets[0].size; |
4206d3aa RM |
1659 | |
1660 | /* | |
1661 | * NT_PRSTATUS is the one special case, because the regset data | |
1662 | * goes into the pr_reg field inside the note contents, rather | |
1663 | * than being the whole note contents. We fill the reset in here. | |
1664 | * We assume that regset 0 is NT_PRSTATUS. | |
1665 | */ | |
1666 | fill_prstatus(&t->prstatus, t->task, signr); | |
90954e7b DS |
1667 | (void) view->regsets[0].get(t->task, &view->regsets[0], 0, regset_size, |
1668 | &t->prstatus.pr_reg, NULL); | |
4206d3aa RM |
1669 | |
1670 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, | |
90954e7b | 1671 | PRSTATUS_SIZE(t->prstatus, regset_size), &t->prstatus); |
4206d3aa RM |
1672 | *total += notesize(&t->notes[0]); |
1673 | ||
d31472b6 RM |
1674 | do_thread_regset_writeback(t->task, &view->regsets[0]); |
1675 | ||
4206d3aa RM |
1676 | /* |
1677 | * Each other regset might generate a note too. For each regset | |
1678 | * that has no core_note_type or is inactive, we leave t->notes[i] | |
1679 | * all zero and we'll know to skip writing it later. | |
1680 | */ | |
1681 | for (i = 1; i < view->n; ++i) { | |
1682 | const struct user_regset *regset = &view->regsets[i]; | |
d31472b6 | 1683 | do_thread_regset_writeback(t->task, regset); |
c8e25258 | 1684 | if (regset->core_note_type && regset->get && |
4206d3aa RM |
1685 | (!regset->active || regset->active(t->task, regset))) { |
1686 | int ret; | |
1687 | size_t size = regset->n * regset->size; | |
1688 | void *data = kmalloc(size, GFP_KERNEL); | |
1689 | if (unlikely(!data)) | |
1690 | return 0; | |
1691 | ret = regset->get(t->task, regset, | |
1692 | 0, size, data, NULL); | |
1693 | if (unlikely(ret)) | |
1694 | kfree(data); | |
1695 | else { | |
1696 | if (regset->core_note_type != NT_PRFPREG) | |
1697 | fill_note(&t->notes[i], "LINUX", | |
1698 | regset->core_note_type, | |
1699 | size, data); | |
1700 | else { | |
90954e7b DS |
1701 | SET_PR_FPVALID(&t->prstatus, |
1702 | 1, regset_size); | |
4206d3aa RM |
1703 | fill_note(&t->notes[i], "CORE", |
1704 | NT_PRFPREG, size, data); | |
1705 | } | |
1706 | *total += notesize(&t->notes[i]); | |
1707 | } | |
1708 | } | |
1709 | } | |
1710 | ||
1711 | return 1; | |
1712 | } | |
1713 | ||
1714 | static int fill_note_info(struct elfhdr *elf, int phdrs, | |
1715 | struct elf_note_info *info, | |
ec57941e | 1716 | const siginfo_t *siginfo, struct pt_regs *regs) |
4206d3aa RM |
1717 | { |
1718 | struct task_struct *dump_task = current; | |
1719 | const struct user_regset_view *view = task_user_regset_view(dump_task); | |
1720 | struct elf_thread_core_info *t; | |
1721 | struct elf_prpsinfo *psinfo; | |
83914441 | 1722 | struct core_thread *ct; |
4206d3aa RM |
1723 | unsigned int i; |
1724 | ||
1725 | info->size = 0; | |
1726 | info->thread = NULL; | |
1727 | ||
1728 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
6899e92d AC |
1729 | if (psinfo == NULL) { |
1730 | info->psinfo.data = NULL; /* So we don't free this wrongly */ | |
4206d3aa | 1731 | return 0; |
6899e92d | 1732 | } |
4206d3aa | 1733 | |
e2dbe125 AW |
1734 | fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
1735 | ||
4206d3aa RM |
1736 | /* |
1737 | * Figure out how many notes we're going to need for each thread. | |
1738 | */ | |
1739 | info->thread_notes = 0; | |
1740 | for (i = 0; i < view->n; ++i) | |
1741 | if (view->regsets[i].core_note_type != 0) | |
1742 | ++info->thread_notes; | |
1743 | ||
1744 | /* | |
1745 | * Sanity check. We rely on regset 0 being in NT_PRSTATUS, | |
1746 | * since it is our one special case. | |
1747 | */ | |
1748 | if (unlikely(info->thread_notes == 0) || | |
1749 | unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) { | |
1750 | WARN_ON(1); | |
1751 | return 0; | |
1752 | } | |
1753 | ||
1754 | /* | |
1755 | * Initialize the ELF file header. | |
1756 | */ | |
1757 | fill_elf_header(elf, phdrs, | |
d3330cf0 | 1758 | view->e_machine, view->e_flags); |
4206d3aa RM |
1759 | |
1760 | /* | |
1761 | * Allocate a structure for each thread. | |
1762 | */ | |
83914441 ON |
1763 | for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) { |
1764 | t = kzalloc(offsetof(struct elf_thread_core_info, | |
1765 | notes[info->thread_notes]), | |
1766 | GFP_KERNEL); | |
1767 | if (unlikely(!t)) | |
1768 | return 0; | |
1769 | ||
1770 | t->task = ct->task; | |
1771 | if (ct->task == dump_task || !info->thread) { | |
1772 | t->next = info->thread; | |
1773 | info->thread = t; | |
1774 | } else { | |
1775 | /* | |
1776 | * Make sure to keep the original task at | |
1777 | * the head of the list. | |
1778 | */ | |
1779 | t->next = info->thread->next; | |
1780 | info->thread->next = t; | |
4206d3aa | 1781 | } |
83914441 | 1782 | } |
4206d3aa RM |
1783 | |
1784 | /* | |
1785 | * Now fill in each thread's information. | |
1786 | */ | |
1787 | for (t = info->thread; t != NULL; t = t->next) | |
5ab1c309 | 1788 | if (!fill_thread_core_info(t, view, siginfo->si_signo, &info->size)) |
4206d3aa RM |
1789 | return 0; |
1790 | ||
1791 | /* | |
1792 | * Fill in the two process-wide notes. | |
1793 | */ | |
1794 | fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm); | |
1795 | info->size += notesize(&info->psinfo); | |
1796 | ||
49ae4d4b DV |
1797 | fill_siginfo_note(&info->signote, &info->csigdata, siginfo); |
1798 | info->size += notesize(&info->signote); | |
1799 | ||
4206d3aa RM |
1800 | fill_auxv_note(&info->auxv, current->mm); |
1801 | info->size += notesize(&info->auxv); | |
1802 | ||
72023656 DA |
1803 | if (fill_files_note(&info->files) == 0) |
1804 | info->size += notesize(&info->files); | |
2aa362c4 | 1805 | |
4206d3aa RM |
1806 | return 1; |
1807 | } | |
1808 | ||
1809 | static size_t get_note_info_size(struct elf_note_info *info) | |
1810 | { | |
1811 | return info->size; | |
1812 | } | |
1813 | ||
1814 | /* | |
1815 | * Write all the notes for each thread. When writing the first thread, the | |
1816 | * process-wide notes are interleaved after the first thread-specific note. | |
1817 | */ | |
1818 | static int write_note_info(struct elf_note_info *info, | |
ecc8c772 | 1819 | struct coredump_params *cprm) |
4206d3aa | 1820 | { |
b219e25f | 1821 | bool first = true; |
4206d3aa RM |
1822 | struct elf_thread_core_info *t = info->thread; |
1823 | ||
1824 | do { | |
1825 | int i; | |
1826 | ||
ecc8c772 | 1827 | if (!writenote(&t->notes[0], cprm)) |
4206d3aa RM |
1828 | return 0; |
1829 | ||
ecc8c772 | 1830 | if (first && !writenote(&info->psinfo, cprm)) |
4206d3aa | 1831 | return 0; |
ecc8c772 | 1832 | if (first && !writenote(&info->signote, cprm)) |
49ae4d4b | 1833 | return 0; |
ecc8c772 | 1834 | if (first && !writenote(&info->auxv, cprm)) |
4206d3aa | 1835 | return 0; |
72023656 | 1836 | if (first && info->files.data && |
ecc8c772 | 1837 | !writenote(&info->files, cprm)) |
2aa362c4 | 1838 | return 0; |
4206d3aa RM |
1839 | |
1840 | for (i = 1; i < info->thread_notes; ++i) | |
1841 | if (t->notes[i].data && | |
ecc8c772 | 1842 | !writenote(&t->notes[i], cprm)) |
4206d3aa RM |
1843 | return 0; |
1844 | ||
b219e25f | 1845 | first = false; |
4206d3aa RM |
1846 | t = t->next; |
1847 | } while (t); | |
1848 | ||
1849 | return 1; | |
1850 | } | |
1851 | ||
1852 | static void free_note_info(struct elf_note_info *info) | |
1853 | { | |
1854 | struct elf_thread_core_info *threads = info->thread; | |
1855 | while (threads) { | |
1856 | unsigned int i; | |
1857 | struct elf_thread_core_info *t = threads; | |
1858 | threads = t->next; | |
1859 | WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus); | |
1860 | for (i = 1; i < info->thread_notes; ++i) | |
1861 | kfree(t->notes[i].data); | |
1862 | kfree(t); | |
1863 | } | |
1864 | kfree(info->psinfo.data); | |
2aa362c4 | 1865 | vfree(info->files.data); |
4206d3aa RM |
1866 | } |
1867 | ||
1868 | #else | |
1869 | ||
1da177e4 LT |
1870 | /* Here is the structure in which status of each thread is captured. */ |
1871 | struct elf_thread_status | |
1872 | { | |
1873 | struct list_head list; | |
1874 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1875 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1876 | struct task_struct *thread; | |
1877 | #ifdef ELF_CORE_COPY_XFPREGS | |
5b20cd80 | 1878 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
1da177e4 LT |
1879 | #endif |
1880 | struct memelfnote notes[3]; | |
1881 | int num_notes; | |
1882 | }; | |
1883 | ||
1884 | /* | |
1885 | * In order to add the specific thread information for the elf file format, | |
f4e5cc2c JJ |
1886 | * we need to keep a linked list of every threads pr_status and then create |
1887 | * a single section for them in the final core file. | |
1da177e4 LT |
1888 | */ |
1889 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1890 | { | |
1891 | int sz = 0; | |
1892 | struct task_struct *p = t->thread; | |
1893 | t->num_notes = 0; | |
1894 | ||
1895 | fill_prstatus(&t->prstatus, p, signr); | |
1896 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1897 | ||
f4e5cc2c JJ |
1898 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
1899 | &(t->prstatus)); | |
1da177e4 LT |
1900 | t->num_notes++; |
1901 | sz += notesize(&t->notes[0]); | |
1902 | ||
f4e5cc2c JJ |
1903 | if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, |
1904 | &t->fpu))) { | |
1905 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1906 | &(t->fpu)); | |
1da177e4 LT |
1907 | t->num_notes++; |
1908 | sz += notesize(&t->notes[1]); | |
1909 | } | |
1910 | ||
1911 | #ifdef ELF_CORE_COPY_XFPREGS | |
1912 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
5b20cd80 MN |
1913 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1914 | sizeof(t->xfpu), &t->xfpu); | |
1da177e4 LT |
1915 | t->num_notes++; |
1916 | sz += notesize(&t->notes[2]); | |
1917 | } | |
1918 | #endif | |
1919 | return sz; | |
1920 | } | |
1921 | ||
3aba481f RM |
1922 | struct elf_note_info { |
1923 | struct memelfnote *notes; | |
72023656 | 1924 | struct memelfnote *notes_files; |
3aba481f RM |
1925 | struct elf_prstatus *prstatus; /* NT_PRSTATUS */ |
1926 | struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */ | |
1927 | struct list_head thread_list; | |
1928 | elf_fpregset_t *fpu; | |
1929 | #ifdef ELF_CORE_COPY_XFPREGS | |
1930 | elf_fpxregset_t *xfpu; | |
1931 | #endif | |
49ae4d4b | 1932 | user_siginfo_t csigdata; |
3aba481f RM |
1933 | int thread_status_size; |
1934 | int numnote; | |
1935 | }; | |
1936 | ||
0cf062d0 | 1937 | static int elf_note_info_init(struct elf_note_info *info) |
3aba481f | 1938 | { |
0cf062d0 | 1939 | memset(info, 0, sizeof(*info)); |
3aba481f RM |
1940 | INIT_LIST_HEAD(&info->thread_list); |
1941 | ||
49ae4d4b | 1942 | /* Allocate space for ELF notes */ |
2aa362c4 | 1943 | info->notes = kmalloc(8 * sizeof(struct memelfnote), GFP_KERNEL); |
3aba481f RM |
1944 | if (!info->notes) |
1945 | return 0; | |
1946 | info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL); | |
1947 | if (!info->psinfo) | |
f34f9d18 | 1948 | return 0; |
3aba481f RM |
1949 | info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL); |
1950 | if (!info->prstatus) | |
f34f9d18 | 1951 | return 0; |
3aba481f RM |
1952 | info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL); |
1953 | if (!info->fpu) | |
f34f9d18 | 1954 | return 0; |
3aba481f RM |
1955 | #ifdef ELF_CORE_COPY_XFPREGS |
1956 | info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL); | |
1957 | if (!info->xfpu) | |
f34f9d18 | 1958 | return 0; |
3aba481f | 1959 | #endif |
0cf062d0 | 1960 | return 1; |
0cf062d0 AW |
1961 | } |
1962 | ||
1963 | static int fill_note_info(struct elfhdr *elf, int phdrs, | |
1964 | struct elf_note_info *info, | |
ec57941e | 1965 | const siginfo_t *siginfo, struct pt_regs *regs) |
0cf062d0 AW |
1966 | { |
1967 | struct list_head *t; | |
afabada9 AV |
1968 | struct core_thread *ct; |
1969 | struct elf_thread_status *ets; | |
0cf062d0 AW |
1970 | |
1971 | if (!elf_note_info_init(info)) | |
1972 | return 0; | |
3aba481f | 1973 | |
afabada9 AV |
1974 | for (ct = current->mm->core_state->dumper.next; |
1975 | ct; ct = ct->next) { | |
1976 | ets = kzalloc(sizeof(*ets), GFP_KERNEL); | |
1977 | if (!ets) | |
1978 | return 0; | |
83914441 | 1979 | |
afabada9 AV |
1980 | ets->thread = ct->task; |
1981 | list_add(&ets->list, &info->thread_list); | |
1982 | } | |
83914441 | 1983 | |
afabada9 AV |
1984 | list_for_each(t, &info->thread_list) { |
1985 | int sz; | |
3aba481f | 1986 | |
afabada9 AV |
1987 | ets = list_entry(t, struct elf_thread_status, list); |
1988 | sz = elf_dump_thread_status(siginfo->si_signo, ets); | |
1989 | info->thread_status_size += sz; | |
3aba481f RM |
1990 | } |
1991 | /* now collect the dump for the current */ | |
1992 | memset(info->prstatus, 0, sizeof(*info->prstatus)); | |
5ab1c309 | 1993 | fill_prstatus(info->prstatus, current, siginfo->si_signo); |
3aba481f RM |
1994 | elf_core_copy_regs(&info->prstatus->pr_reg, regs); |
1995 | ||
1996 | /* Set up header */ | |
d3330cf0 | 1997 | fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS); |
3aba481f RM |
1998 | |
1999 | /* | |
2000 | * Set up the notes in similar form to SVR4 core dumps made | |
2001 | * with info from their /proc. | |
2002 | */ | |
2003 | ||
2004 | fill_note(info->notes + 0, "CORE", NT_PRSTATUS, | |
2005 | sizeof(*info->prstatus), info->prstatus); | |
2006 | fill_psinfo(info->psinfo, current->group_leader, current->mm); | |
2007 | fill_note(info->notes + 1, "CORE", NT_PRPSINFO, | |
2008 | sizeof(*info->psinfo), info->psinfo); | |
2009 | ||
2aa362c4 DV |
2010 | fill_siginfo_note(info->notes + 2, &info->csigdata, siginfo); |
2011 | fill_auxv_note(info->notes + 3, current->mm); | |
72023656 | 2012 | info->numnote = 4; |
3aba481f | 2013 | |
72023656 DA |
2014 | if (fill_files_note(info->notes + info->numnote) == 0) { |
2015 | info->notes_files = info->notes + info->numnote; | |
2016 | info->numnote++; | |
2017 | } | |
3aba481f RM |
2018 | |
2019 | /* Try to dump the FPU. */ | |
2020 | info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs, | |
2021 | info->fpu); | |
2022 | if (info->prstatus->pr_fpvalid) | |
2023 | fill_note(info->notes + info->numnote++, | |
2024 | "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu); | |
2025 | #ifdef ELF_CORE_COPY_XFPREGS | |
2026 | if (elf_core_copy_task_xfpregs(current, info->xfpu)) | |
2027 | fill_note(info->notes + info->numnote++, | |
2028 | "LINUX", ELF_CORE_XFPREG_TYPE, | |
2029 | sizeof(*info->xfpu), info->xfpu); | |
2030 | #endif | |
2031 | ||
2032 | return 1; | |
3aba481f RM |
2033 | } |
2034 | ||
2035 | static size_t get_note_info_size(struct elf_note_info *info) | |
2036 | { | |
2037 | int sz = 0; | |
2038 | int i; | |
2039 | ||
2040 | for (i = 0; i < info->numnote; i++) | |
2041 | sz += notesize(info->notes + i); | |
2042 | ||
2043 | sz += info->thread_status_size; | |
2044 | ||
2045 | return sz; | |
2046 | } | |
2047 | ||
2048 | static int write_note_info(struct elf_note_info *info, | |
ecc8c772 | 2049 | struct coredump_params *cprm) |
3aba481f RM |
2050 | { |
2051 | int i; | |
2052 | struct list_head *t; | |
2053 | ||
2054 | for (i = 0; i < info->numnote; i++) | |
ecc8c772 | 2055 | if (!writenote(info->notes + i, cprm)) |
3aba481f RM |
2056 | return 0; |
2057 | ||
2058 | /* write out the thread status notes section */ | |
2059 | list_for_each(t, &info->thread_list) { | |
2060 | struct elf_thread_status *tmp = | |
2061 | list_entry(t, struct elf_thread_status, list); | |
2062 | ||
2063 | for (i = 0; i < tmp->num_notes; i++) | |
ecc8c772 | 2064 | if (!writenote(&tmp->notes[i], cprm)) |
3aba481f RM |
2065 | return 0; |
2066 | } | |
2067 | ||
2068 | return 1; | |
2069 | } | |
2070 | ||
2071 | static void free_note_info(struct elf_note_info *info) | |
2072 | { | |
2073 | while (!list_empty(&info->thread_list)) { | |
2074 | struct list_head *tmp = info->thread_list.next; | |
2075 | list_del(tmp); | |
2076 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
2077 | } | |
2078 | ||
72023656 DA |
2079 | /* Free data possibly allocated by fill_files_note(): */ |
2080 | if (info->notes_files) | |
2081 | vfree(info->notes_files->data); | |
2aa362c4 | 2082 | |
3aba481f RM |
2083 | kfree(info->prstatus); |
2084 | kfree(info->psinfo); | |
2085 | kfree(info->notes); | |
2086 | kfree(info->fpu); | |
2087 | #ifdef ELF_CORE_COPY_XFPREGS | |
2088 | kfree(info->xfpu); | |
2089 | #endif | |
2090 | } | |
2091 | ||
4206d3aa RM |
2092 | #endif |
2093 | ||
f47aef55 RM |
2094 | static struct vm_area_struct *first_vma(struct task_struct *tsk, |
2095 | struct vm_area_struct *gate_vma) | |
2096 | { | |
2097 | struct vm_area_struct *ret = tsk->mm->mmap; | |
2098 | ||
2099 | if (ret) | |
2100 | return ret; | |
2101 | return gate_vma; | |
2102 | } | |
2103 | /* | |
2104 | * Helper function for iterating across a vma list. It ensures that the caller | |
2105 | * will visit `gate_vma' prior to terminating the search. | |
2106 | */ | |
2107 | static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma, | |
2108 | struct vm_area_struct *gate_vma) | |
2109 | { | |
2110 | struct vm_area_struct *ret; | |
2111 | ||
2112 | ret = this_vma->vm_next; | |
2113 | if (ret) | |
2114 | return ret; | |
2115 | if (this_vma == gate_vma) | |
2116 | return NULL; | |
2117 | return gate_vma; | |
2118 | } | |
2119 | ||
8d9032bb DH |
2120 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
2121 | elf_addr_t e_shoff, int segs) | |
2122 | { | |
2123 | elf->e_shoff = e_shoff; | |
2124 | elf->e_shentsize = sizeof(*shdr4extnum); | |
2125 | elf->e_shnum = 1; | |
2126 | elf->e_shstrndx = SHN_UNDEF; | |
2127 | ||
2128 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); | |
2129 | ||
2130 | shdr4extnum->sh_type = SHT_NULL; | |
2131 | shdr4extnum->sh_size = elf->e_shnum; | |
2132 | shdr4extnum->sh_link = elf->e_shstrndx; | |
2133 | shdr4extnum->sh_info = segs; | |
2134 | } | |
2135 | ||
1da177e4 LT |
2136 | /* |
2137 | * Actual dumper | |
2138 | * | |
2139 | * This is a two-pass process; first we find the offsets of the bits, | |
2140 | * and then they are actually written out. If we run out of core limit | |
2141 | * we just truncate. | |
2142 | */ | |
f6151dfe | 2143 | static int elf_core_dump(struct coredump_params *cprm) |
1da177e4 | 2144 | { |
1da177e4 LT |
2145 | int has_dumped = 0; |
2146 | mm_segment_t fs; | |
52f5592e JL |
2147 | int segs, i; |
2148 | size_t vma_data_size = 0; | |
f47aef55 | 2149 | struct vm_area_struct *vma, *gate_vma; |
1da177e4 | 2150 | struct elfhdr *elf = NULL; |
cdc3d562 | 2151 | loff_t offset = 0, dataoff; |
72023656 | 2152 | struct elf_note_info info = { }; |
93eb211e | 2153 | struct elf_phdr *phdr4note = NULL; |
8d9032bb DH |
2154 | struct elf_shdr *shdr4extnum = NULL; |
2155 | Elf_Half e_phnum; | |
2156 | elf_addr_t e_shoff; | |
52f5592e | 2157 | elf_addr_t *vma_filesz = NULL; |
1da177e4 LT |
2158 | |
2159 | /* | |
2160 | * We no longer stop all VM operations. | |
2161 | * | |
f4e5cc2c JJ |
2162 | * This is because those proceses that could possibly change map_count |
2163 | * or the mmap / vma pages are now blocked in do_exit on current | |
2164 | * finishing this core dump. | |
1da177e4 LT |
2165 | * |
2166 | * Only ptrace can touch these memory addresses, but it doesn't change | |
f4e5cc2c | 2167 | * the map_count or the pages allocated. So no possibility of crashing |
1da177e4 LT |
2168 | * exists while dumping the mm->vm_next areas to the core file. |
2169 | */ | |
2170 | ||
2171 | /* alloc memory for large data structures: too large to be on stack */ | |
2172 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
2173 | if (!elf) | |
5f719558 | 2174 | goto out; |
341c87bf KH |
2175 | /* |
2176 | * The number of segs are recored into ELF header as 16bit value. | |
2177 | * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here. | |
2178 | */ | |
1da177e4 | 2179 | segs = current->mm->map_count; |
1fcccbac | 2180 | segs += elf_core_extra_phdrs(); |
1da177e4 | 2181 | |
31db58b3 | 2182 | gate_vma = get_gate_vma(current->mm); |
f47aef55 RM |
2183 | if (gate_vma != NULL) |
2184 | segs++; | |
2185 | ||
8d9032bb DH |
2186 | /* for notes section */ |
2187 | segs++; | |
2188 | ||
2189 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid | |
2190 | * this, kernel supports extended numbering. Have a look at | |
2191 | * include/linux/elf.h for further information. */ | |
2192 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; | |
2193 | ||
1da177e4 | 2194 | /* |
3aba481f RM |
2195 | * Collect all the non-memory information about the process for the |
2196 | * notes. This also sets up the file header. | |
1da177e4 | 2197 | */ |
5ab1c309 | 2198 | if (!fill_note_info(elf, e_phnum, &info, cprm->siginfo, cprm->regs)) |
3aba481f | 2199 | goto cleanup; |
1da177e4 | 2200 | |
3aba481f | 2201 | has_dumped = 1; |
079148b9 | 2202 | |
1da177e4 LT |
2203 | fs = get_fs(); |
2204 | set_fs(KERNEL_DS); | |
2205 | ||
1da177e4 | 2206 | offset += sizeof(*elf); /* Elf header */ |
8d9032bb | 2207 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
1da177e4 LT |
2208 | |
2209 | /* Write notes phdr entry */ | |
2210 | { | |
3aba481f | 2211 | size_t sz = get_note_info_size(&info); |
1da177e4 | 2212 | |
e5501492 | 2213 | sz += elf_coredump_extra_notes_size(); |
bf1ab978 | 2214 | |
93eb211e DH |
2215 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
2216 | if (!phdr4note) | |
088e7af7 | 2217 | goto end_coredump; |
93eb211e DH |
2218 | |
2219 | fill_elf_note_phdr(phdr4note, sz, offset); | |
2220 | offset += sz; | |
1da177e4 LT |
2221 | } |
2222 | ||
1da177e4 LT |
2223 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
2224 | ||
30f74aa0 JB |
2225 | if (segs - 1 > ULONG_MAX / sizeof(*vma_filesz)) |
2226 | goto end_coredump; | |
2227 | vma_filesz = vmalloc((segs - 1) * sizeof(*vma_filesz)); | |
52f5592e JL |
2228 | if (!vma_filesz) |
2229 | goto end_coredump; | |
2230 | ||
2231 | for (i = 0, vma = first_vma(current, gate_vma); vma != NULL; | |
2232 | vma = next_vma(vma, gate_vma)) { | |
2233 | unsigned long dump_size; | |
2234 | ||
2235 | dump_size = vma_dump_size(vma, cprm->mm_flags); | |
2236 | vma_filesz[i++] = dump_size; | |
2237 | vma_data_size += dump_size; | |
2238 | } | |
2239 | ||
2240 | offset += vma_data_size; | |
8d9032bb DH |
2241 | offset += elf_core_extra_data_size(); |
2242 | e_shoff = offset; | |
2243 | ||
2244 | if (e_phnum == PN_XNUM) { | |
2245 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); | |
2246 | if (!shdr4extnum) | |
2247 | goto end_coredump; | |
2248 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs); | |
2249 | } | |
2250 | ||
2251 | offset = dataoff; | |
2252 | ||
ecc8c772 | 2253 | if (!dump_emit(cprm, elf, sizeof(*elf))) |
93eb211e DH |
2254 | goto end_coredump; |
2255 | ||
ecc8c772 | 2256 | if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) |
93eb211e DH |
2257 | goto end_coredump; |
2258 | ||
1da177e4 | 2259 | /* Write program headers for segments dump */ |
52f5592e | 2260 | for (i = 0, vma = first_vma(current, gate_vma); vma != NULL; |
f47aef55 | 2261 | vma = next_vma(vma, gate_vma)) { |
1da177e4 | 2262 | struct elf_phdr phdr; |
1da177e4 LT |
2263 | |
2264 | phdr.p_type = PT_LOAD; | |
2265 | phdr.p_offset = offset; | |
2266 | phdr.p_vaddr = vma->vm_start; | |
2267 | phdr.p_paddr = 0; | |
52f5592e | 2268 | phdr.p_filesz = vma_filesz[i++]; |
82df3973 | 2269 | phdr.p_memsz = vma->vm_end - vma->vm_start; |
1da177e4 LT |
2270 | offset += phdr.p_filesz; |
2271 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
f4e5cc2c JJ |
2272 | if (vma->vm_flags & VM_WRITE) |
2273 | phdr.p_flags |= PF_W; | |
2274 | if (vma->vm_flags & VM_EXEC) | |
2275 | phdr.p_flags |= PF_X; | |
1da177e4 LT |
2276 | phdr.p_align = ELF_EXEC_PAGESIZE; |
2277 | ||
ecc8c772 | 2278 | if (!dump_emit(cprm, &phdr, sizeof(phdr))) |
088e7af7 | 2279 | goto end_coredump; |
1da177e4 LT |
2280 | } |
2281 | ||
506f21c5 | 2282 | if (!elf_core_write_extra_phdrs(cprm, offset)) |
1fcccbac | 2283 | goto end_coredump; |
1da177e4 LT |
2284 | |
2285 | /* write out the notes section */ | |
ecc8c772 | 2286 | if (!write_note_info(&info, cprm)) |
3aba481f | 2287 | goto end_coredump; |
1da177e4 | 2288 | |
cdc3d562 | 2289 | if (elf_coredump_extra_notes_write(cprm)) |
e5501492 | 2290 | goto end_coredump; |
bf1ab978 | 2291 | |
d025c9db | 2292 | /* Align to page */ |
1607f09c | 2293 | if (!dump_skip(cprm, dataoff - cprm->pos)) |
f3e8fccd | 2294 | goto end_coredump; |
1da177e4 | 2295 | |
52f5592e | 2296 | for (i = 0, vma = first_vma(current, gate_vma); vma != NULL; |
f47aef55 | 2297 | vma = next_vma(vma, gate_vma)) { |
1da177e4 | 2298 | unsigned long addr; |
82df3973 | 2299 | unsigned long end; |
1da177e4 | 2300 | |
52f5592e | 2301 | end = vma->vm_start + vma_filesz[i++]; |
1da177e4 | 2302 | |
82df3973 | 2303 | for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) { |
f4e5cc2c | 2304 | struct page *page; |
f3e8fccd HD |
2305 | int stop; |
2306 | ||
2307 | page = get_dump_page(addr); | |
2308 | if (page) { | |
2309 | void *kaddr = kmap(page); | |
13046ece | 2310 | stop = !dump_emit(cprm, kaddr, PAGE_SIZE); |
f3e8fccd | 2311 | kunmap(page); |
09cbfeaf | 2312 | put_page(page); |
f3e8fccd | 2313 | } else |
9b56d543 | 2314 | stop = !dump_skip(cprm, PAGE_SIZE); |
f3e8fccd HD |
2315 | if (stop) |
2316 | goto end_coredump; | |
1da177e4 LT |
2317 | } |
2318 | } | |
4d22c75d | 2319 | dump_truncate(cprm); |
1da177e4 | 2320 | |
aa3e7eaf | 2321 | if (!elf_core_write_extra_data(cprm)) |
1fcccbac | 2322 | goto end_coredump; |
1da177e4 | 2323 | |
8d9032bb | 2324 | if (e_phnum == PN_XNUM) { |
13046ece | 2325 | if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) |
8d9032bb DH |
2326 | goto end_coredump; |
2327 | } | |
2328 | ||
1da177e4 LT |
2329 | end_coredump: |
2330 | set_fs(fs); | |
2331 | ||
2332 | cleanup: | |
3aba481f | 2333 | free_note_info(&info); |
8d9032bb | 2334 | kfree(shdr4extnum); |
30f74aa0 | 2335 | vfree(vma_filesz); |
93eb211e | 2336 | kfree(phdr4note); |
5f719558 WC |
2337 | kfree(elf); |
2338 | out: | |
1da177e4 | 2339 | return has_dumped; |
1da177e4 LT |
2340 | } |
2341 | ||
698ba7b5 | 2342 | #endif /* CONFIG_ELF_CORE */ |
1da177e4 LT |
2343 | |
2344 | static int __init init_elf_binfmt(void) | |
2345 | { | |
8fc3dc5a AV |
2346 | register_binfmt(&elf_format); |
2347 | return 0; | |
1da177e4 LT |
2348 | } |
2349 | ||
2350 | static void __exit exit_elf_binfmt(void) | |
2351 | { | |
2352 | /* Remove the COFF and ELF loaders. */ | |
2353 | unregister_binfmt(&elf_format); | |
2354 | } | |
2355 | ||
2356 | core_initcall(init_elf_binfmt); | |
2357 | module_exit(exit_elf_binfmt); | |
2358 | MODULE_LICENSE("GPL"); |