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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> |
5037835c | 39 | #include <linux/dax.h> |
7c0f6ba6 | 40 | #include <linux/uaccess.h> |
1da177e4 LT |
41 | #include <asm/param.h> |
42 | #include <asm/page.h> | |
43 | ||
2aa362c4 DV |
44 | #ifndef user_long_t |
45 | #define user_long_t long | |
46 | #endif | |
49ae4d4b DV |
47 | #ifndef user_siginfo_t |
48 | #define user_siginfo_t siginfo_t | |
49 | #endif | |
50 | ||
71613c3b | 51 | static int load_elf_binary(struct linux_binprm *bprm); |
bb1ad820 AM |
52 | static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *, |
53 | int, int, unsigned long); | |
1da177e4 | 54 | |
69369a70 JT |
55 | #ifdef CONFIG_USELIB |
56 | static int load_elf_library(struct file *); | |
57 | #else | |
58 | #define load_elf_library NULL | |
59 | #endif | |
60 | ||
1da177e4 LT |
61 | /* |
62 | * If we don't support core dumping, then supply a NULL so we | |
63 | * don't even try. | |
64 | */ | |
698ba7b5 | 65 | #ifdef CONFIG_ELF_CORE |
f6151dfe | 66 | static int elf_core_dump(struct coredump_params *cprm); |
1da177e4 LT |
67 | #else |
68 | #define elf_core_dump NULL | |
69 | #endif | |
70 | ||
71 | #if ELF_EXEC_PAGESIZE > PAGE_SIZE | |
f4e5cc2c | 72 | #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE |
1da177e4 | 73 | #else |
f4e5cc2c | 74 | #define ELF_MIN_ALIGN PAGE_SIZE |
1da177e4 LT |
75 | #endif |
76 | ||
77 | #ifndef ELF_CORE_EFLAGS | |
78 | #define ELF_CORE_EFLAGS 0 | |
79 | #endif | |
80 | ||
81 | #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1)) | |
82 | #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1)) | |
83 | #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1)) | |
84 | ||
85 | static struct linux_binfmt elf_format = { | |
f670d0ec MP |
86 | .module = THIS_MODULE, |
87 | .load_binary = load_elf_binary, | |
88 | .load_shlib = load_elf_library, | |
89 | .core_dump = elf_core_dump, | |
90 | .min_coredump = ELF_EXEC_PAGESIZE, | |
1da177e4 LT |
91 | }; |
92 | ||
d4e3cc38 | 93 | #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE) |
1da177e4 | 94 | |
16e72e9b | 95 | static int set_brk(unsigned long start, unsigned long end, int prot) |
1da177e4 LT |
96 | { |
97 | start = ELF_PAGEALIGN(start); | |
98 | end = ELF_PAGEALIGN(end); | |
99 | if (end > start) { | |
16e72e9b DV |
100 | /* |
101 | * Map the last of the bss segment. | |
102 | * If the header is requesting these pages to be | |
103 | * executable, honour that (ppc32 needs this). | |
104 | */ | |
105 | int error = vm_brk_flags(start, end - start, | |
106 | prot & PROT_EXEC ? VM_EXEC : 0); | |
5d22fc25 LT |
107 | if (error) |
108 | return error; | |
1da177e4 LT |
109 | } |
110 | current->mm->start_brk = current->mm->brk = end; | |
111 | return 0; | |
112 | } | |
113 | ||
1da177e4 LT |
114 | /* We need to explicitly zero any fractional pages |
115 | after the data section (i.e. bss). This would | |
116 | contain the junk from the file that should not | |
f4e5cc2c JJ |
117 | be in memory |
118 | */ | |
1da177e4 LT |
119 | static int padzero(unsigned long elf_bss) |
120 | { | |
121 | unsigned long nbyte; | |
122 | ||
123 | nbyte = ELF_PAGEOFFSET(elf_bss); | |
124 | if (nbyte) { | |
125 | nbyte = ELF_MIN_ALIGN - nbyte; | |
126 | if (clear_user((void __user *) elf_bss, nbyte)) | |
127 | return -EFAULT; | |
128 | } | |
129 | return 0; | |
130 | } | |
131 | ||
09c6dd3c | 132 | /* Let's use some macros to make this stack manipulation a little clearer */ |
1da177e4 LT |
133 | #ifdef CONFIG_STACK_GROWSUP |
134 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items)) | |
135 | #define STACK_ROUND(sp, items) \ | |
136 | ((15 + (unsigned long) ((sp) + (items))) &~ 15UL) | |
f4e5cc2c JJ |
137 | #define STACK_ALLOC(sp, len) ({ \ |
138 | elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \ | |
139 | old_sp; }) | |
1da177e4 LT |
140 | #else |
141 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items)) | |
142 | #define STACK_ROUND(sp, items) \ | |
143 | (((unsigned long) (sp - items)) &~ 15UL) | |
144 | #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; }) | |
145 | #endif | |
146 | ||
483fad1c NL |
147 | #ifndef ELF_BASE_PLATFORM |
148 | /* | |
149 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. | |
150 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value | |
151 | * will be copied to the user stack in the same manner as AT_PLATFORM. | |
152 | */ | |
153 | #define ELF_BASE_PLATFORM NULL | |
154 | #endif | |
155 | ||
1da177e4 | 156 | static int |
f4e5cc2c | 157 | create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec, |
d20894a2 | 158 | unsigned long load_addr, unsigned long interp_load_addr) |
1da177e4 LT |
159 | { |
160 | unsigned long p = bprm->p; | |
161 | int argc = bprm->argc; | |
162 | int envc = bprm->envc; | |
163 | elf_addr_t __user *argv; | |
164 | elf_addr_t __user *envp; | |
165 | elf_addr_t __user *sp; | |
166 | elf_addr_t __user *u_platform; | |
483fad1c | 167 | elf_addr_t __user *u_base_platform; |
f06295b4 | 168 | elf_addr_t __user *u_rand_bytes; |
1da177e4 | 169 | const char *k_platform = ELF_PLATFORM; |
483fad1c | 170 | const char *k_base_platform = ELF_BASE_PLATFORM; |
f06295b4 | 171 | unsigned char k_rand_bytes[16]; |
1da177e4 LT |
172 | int items; |
173 | elf_addr_t *elf_info; | |
174 | int ei_index = 0; | |
86a264ab | 175 | const struct cred *cred = current_cred(); |
b6a2fea3 | 176 | struct vm_area_struct *vma; |
1da177e4 | 177 | |
d68c9d6a FBH |
178 | /* |
179 | * In some cases (e.g. Hyper-Threading), we want to avoid L1 | |
180 | * evictions by the processes running on the same package. One | |
181 | * thing we can do is to shuffle the initial stack for them. | |
182 | */ | |
183 | ||
184 | p = arch_align_stack(p); | |
185 | ||
1da177e4 LT |
186 | /* |
187 | * If this architecture has a platform capability string, copy it | |
188 | * to userspace. In some cases (Sparc), this info is impossible | |
189 | * for userspace to get any other way, in others (i386) it is | |
190 | * merely difficult. | |
191 | */ | |
1da177e4 LT |
192 | u_platform = NULL; |
193 | if (k_platform) { | |
194 | size_t len = strlen(k_platform) + 1; | |
195 | ||
1da177e4 LT |
196 | u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); |
197 | if (__copy_to_user(u_platform, k_platform, len)) | |
198 | return -EFAULT; | |
199 | } | |
200 | ||
483fad1c NL |
201 | /* |
202 | * If this architecture has a "base" platform capability | |
203 | * string, copy it to userspace. | |
204 | */ | |
205 | u_base_platform = NULL; | |
206 | if (k_base_platform) { | |
207 | size_t len = strlen(k_base_platform) + 1; | |
208 | ||
209 | u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); | |
210 | if (__copy_to_user(u_base_platform, k_base_platform, len)) | |
211 | return -EFAULT; | |
212 | } | |
213 | ||
f06295b4 KC |
214 | /* |
215 | * Generate 16 random bytes for userspace PRNG seeding. | |
216 | */ | |
217 | get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes)); | |
218 | u_rand_bytes = (elf_addr_t __user *) | |
219 | STACK_ALLOC(p, sizeof(k_rand_bytes)); | |
220 | if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes))) | |
221 | return -EFAULT; | |
222 | ||
1da177e4 | 223 | /* Create the ELF interpreter info */ |
785d5570 | 224 | elf_info = (elf_addr_t *)current->mm->saved_auxv; |
4f9a58d7 | 225 | /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */ |
1da177e4 | 226 | #define NEW_AUX_ENT(id, val) \ |
f4e5cc2c | 227 | do { \ |
785d5570 JJ |
228 | elf_info[ei_index++] = id; \ |
229 | elf_info[ei_index++] = val; \ | |
f4e5cc2c | 230 | } while (0) |
1da177e4 LT |
231 | |
232 | #ifdef ARCH_DLINFO | |
233 | /* | |
234 | * ARCH_DLINFO must come first so PPC can do its special alignment of | |
235 | * AUXV. | |
4f9a58d7 OH |
236 | * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in |
237 | * ARCH_DLINFO changes | |
1da177e4 LT |
238 | */ |
239 | ARCH_DLINFO; | |
240 | #endif | |
241 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); | |
242 | NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE); | |
243 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
244 | NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff); | |
f4e5cc2c | 245 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
1da177e4 LT |
246 | NEW_AUX_ENT(AT_PHNUM, exec->e_phnum); |
247 | NEW_AUX_ENT(AT_BASE, interp_load_addr); | |
248 | NEW_AUX_ENT(AT_FLAGS, 0); | |
249 | NEW_AUX_ENT(AT_ENTRY, exec->e_entry); | |
ebc887b2 EB |
250 | NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid)); |
251 | NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid)); | |
252 | NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid)); | |
253 | NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid)); | |
785d5570 | 254 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
f06295b4 | 255 | NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes); |
2171364d MN |
256 | #ifdef ELF_HWCAP2 |
257 | NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2); | |
258 | #endif | |
65191087 | 259 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
1da177e4 | 260 | if (k_platform) { |
f4e5cc2c | 261 | NEW_AUX_ENT(AT_PLATFORM, |
785d5570 | 262 | (elf_addr_t)(unsigned long)u_platform); |
1da177e4 | 263 | } |
483fad1c NL |
264 | if (k_base_platform) { |
265 | NEW_AUX_ENT(AT_BASE_PLATFORM, | |
266 | (elf_addr_t)(unsigned long)u_base_platform); | |
267 | } | |
1da177e4 | 268 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
785d5570 | 269 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); |
1da177e4 LT |
270 | } |
271 | #undef NEW_AUX_ENT | |
272 | /* AT_NULL is zero; clear the rest too */ | |
273 | memset(&elf_info[ei_index], 0, | |
274 | sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]); | |
275 | ||
276 | /* And advance past the AT_NULL entry. */ | |
277 | ei_index += 2; | |
278 | ||
279 | sp = STACK_ADD(p, ei_index); | |
280 | ||
d20894a2 | 281 | items = (argc + 1) + (envc + 1) + 1; |
1da177e4 LT |
282 | bprm->p = STACK_ROUND(sp, items); |
283 | ||
284 | /* Point sp at the lowest address on the stack */ | |
285 | #ifdef CONFIG_STACK_GROWSUP | |
286 | sp = (elf_addr_t __user *)bprm->p - items - ei_index; | |
f4e5cc2c | 287 | bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */ |
1da177e4 LT |
288 | #else |
289 | sp = (elf_addr_t __user *)bprm->p; | |
290 | #endif | |
291 | ||
b6a2fea3 OW |
292 | |
293 | /* | |
294 | * Grow the stack manually; some architectures have a limit on how | |
295 | * far ahead a user-space access may be in order to grow the stack. | |
296 | */ | |
297 | vma = find_extend_vma(current->mm, bprm->p); | |
298 | if (!vma) | |
299 | return -EFAULT; | |
300 | ||
1da177e4 LT |
301 | /* Now, let's put argc (and argv, envp if appropriate) on the stack */ |
302 | if (__put_user(argc, sp++)) | |
303 | return -EFAULT; | |
d20894a2 AK |
304 | argv = sp; |
305 | envp = argv + argc + 1; | |
1da177e4 LT |
306 | |
307 | /* Populate argv and envp */ | |
a84a5059 | 308 | p = current->mm->arg_end = current->mm->arg_start; |
1da177e4 LT |
309 | while (argc-- > 0) { |
310 | size_t len; | |
841d5fb7 HC |
311 | if (__put_user((elf_addr_t)p, argv++)) |
312 | return -EFAULT; | |
b6a2fea3 OW |
313 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
314 | if (!len || len > MAX_ARG_STRLEN) | |
23c4971e | 315 | return -EINVAL; |
1da177e4 LT |
316 | p += len; |
317 | } | |
318 | if (__put_user(0, argv)) | |
319 | return -EFAULT; | |
320 | current->mm->arg_end = current->mm->env_start = p; | |
321 | while (envc-- > 0) { | |
322 | size_t len; | |
841d5fb7 HC |
323 | if (__put_user((elf_addr_t)p, envp++)) |
324 | return -EFAULT; | |
b6a2fea3 OW |
325 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
326 | if (!len || len > MAX_ARG_STRLEN) | |
23c4971e | 327 | return -EINVAL; |
1da177e4 LT |
328 | p += len; |
329 | } | |
330 | if (__put_user(0, envp)) | |
331 | return -EFAULT; | |
332 | current->mm->env_end = p; | |
333 | ||
334 | /* Put the elf_info on the stack in the right place. */ | |
335 | sp = (elf_addr_t __user *)envp + 1; | |
336 | if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t))) | |
337 | return -EFAULT; | |
338 | return 0; | |
339 | } | |
340 | ||
c07380be JH |
341 | #ifndef elf_map |
342 | ||
1da177e4 | 343 | static unsigned long elf_map(struct file *filep, unsigned long addr, |
cc503c1b JK |
344 | struct elf_phdr *eppnt, int prot, int type, |
345 | unsigned long total_size) | |
1da177e4 LT |
346 | { |
347 | unsigned long map_addr; | |
cc503c1b JK |
348 | unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr); |
349 | unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr); | |
350 | addr = ELF_PAGESTART(addr); | |
351 | size = ELF_PAGEALIGN(size); | |
1da177e4 | 352 | |
dda6ebde DG |
353 | /* mmap() will return -EINVAL if given a zero size, but a |
354 | * segment with zero filesize is perfectly valid */ | |
cc503c1b JK |
355 | if (!size) |
356 | return addr; | |
357 | ||
cc503c1b JK |
358 | /* |
359 | * total_size is the size of the ELF (interpreter) image. | |
360 | * The _first_ mmap needs to know the full size, otherwise | |
361 | * randomization might put this image into an overlapping | |
362 | * position with the ELF binary image. (since size < total_size) | |
363 | * So we first map the 'big' image - and unmap the remainder at | |
364 | * the end. (which unmap is needed for ELF images with holes.) | |
365 | */ | |
366 | if (total_size) { | |
367 | total_size = ELF_PAGEALIGN(total_size); | |
5a5e4c2e | 368 | map_addr = vm_mmap(filep, addr, total_size, prot, type, off); |
cc503c1b | 369 | if (!BAD_ADDR(map_addr)) |
5a5e4c2e | 370 | vm_munmap(map_addr+size, total_size-size); |
cc503c1b | 371 | } else |
5a5e4c2e | 372 | map_addr = vm_mmap(filep, addr, size, prot, type, off); |
cc503c1b | 373 | |
1da177e4 LT |
374 | return(map_addr); |
375 | } | |
376 | ||
c07380be JH |
377 | #endif /* !elf_map */ |
378 | ||
cc503c1b JK |
379 | static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr) |
380 | { | |
381 | int i, first_idx = -1, last_idx = -1; | |
382 | ||
383 | for (i = 0; i < nr; i++) { | |
384 | if (cmds[i].p_type == PT_LOAD) { | |
385 | last_idx = i; | |
386 | if (first_idx == -1) | |
387 | first_idx = i; | |
388 | } | |
389 | } | |
390 | if (first_idx == -1) | |
391 | return 0; | |
392 | ||
393 | return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz - | |
394 | ELF_PAGESTART(cmds[first_idx].p_vaddr); | |
395 | } | |
396 | ||
6a8d3894 PB |
397 | /** |
398 | * load_elf_phdrs() - load ELF program headers | |
399 | * @elf_ex: ELF header of the binary whose program headers should be loaded | |
400 | * @elf_file: the opened ELF binary file | |
401 | * | |
402 | * Loads ELF program headers from the binary file elf_file, which has the ELF | |
403 | * header pointed to by elf_ex, into a newly allocated array. The caller is | |
404 | * responsible for freeing the allocated data. Returns an ERR_PTR upon failure. | |
405 | */ | |
406 | static struct elf_phdr *load_elf_phdrs(struct elfhdr *elf_ex, | |
407 | struct file *elf_file) | |
408 | { | |
409 | struct elf_phdr *elf_phdata = NULL; | |
410 | int retval, size, err = -1; | |
411 | ||
412 | /* | |
413 | * If the size of this structure has changed, then punt, since | |
414 | * we will be doing the wrong thing. | |
415 | */ | |
416 | if (elf_ex->e_phentsize != sizeof(struct elf_phdr)) | |
417 | goto out; | |
418 | ||
419 | /* Sanity check the number of program headers... */ | |
420 | if (elf_ex->e_phnum < 1 || | |
421 | elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr)) | |
422 | goto out; | |
423 | ||
424 | /* ...and their total size. */ | |
425 | size = sizeof(struct elf_phdr) * elf_ex->e_phnum; | |
426 | if (size > ELF_MIN_ALIGN) | |
427 | goto out; | |
428 | ||
429 | elf_phdata = kmalloc(size, GFP_KERNEL); | |
430 | if (!elf_phdata) | |
431 | goto out; | |
432 | ||
433 | /* Read in the program headers */ | |
434 | retval = kernel_read(elf_file, elf_ex->e_phoff, | |
435 | (char *)elf_phdata, size); | |
436 | if (retval != size) { | |
437 | err = (retval < 0) ? retval : -EIO; | |
438 | goto out; | |
439 | } | |
440 | ||
441 | /* Success! */ | |
442 | err = 0; | |
443 | out: | |
444 | if (err) { | |
445 | kfree(elf_phdata); | |
446 | elf_phdata = NULL; | |
447 | } | |
448 | return elf_phdata; | |
449 | } | |
cc503c1b | 450 | |
774c105e PB |
451 | #ifndef CONFIG_ARCH_BINFMT_ELF_STATE |
452 | ||
453 | /** | |
454 | * struct arch_elf_state - arch-specific ELF loading state | |
455 | * | |
456 | * This structure is used to preserve architecture specific data during | |
457 | * the loading of an ELF file, throughout the checking of architecture | |
458 | * specific ELF headers & through to the point where the ELF load is | |
459 | * known to be proceeding (ie. SET_PERSONALITY). | |
460 | * | |
461 | * This implementation is a dummy for architectures which require no | |
462 | * specific state. | |
463 | */ | |
464 | struct arch_elf_state { | |
465 | }; | |
466 | ||
467 | #define INIT_ARCH_ELF_STATE {} | |
468 | ||
469 | /** | |
470 | * arch_elf_pt_proc() - check a PT_LOPROC..PT_HIPROC ELF program header | |
471 | * @ehdr: The main ELF header | |
472 | * @phdr: The program header to check | |
473 | * @elf: The open ELF file | |
474 | * @is_interp: True if the phdr is from the interpreter of the ELF being | |
475 | * loaded, else false. | |
476 | * @state: Architecture-specific state preserved throughout the process | |
477 | * of loading the ELF. | |
478 | * | |
479 | * Inspects the program header phdr to validate its correctness and/or | |
480 | * suitability for the system. Called once per ELF program header in the | |
481 | * range PT_LOPROC to PT_HIPROC, for both the ELF being loaded and its | |
482 | * interpreter. | |
483 | * | |
484 | * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load | |
485 | * with that return code. | |
486 | */ | |
487 | static inline int arch_elf_pt_proc(struct elfhdr *ehdr, | |
488 | struct elf_phdr *phdr, | |
489 | struct file *elf, bool is_interp, | |
490 | struct arch_elf_state *state) | |
491 | { | |
492 | /* Dummy implementation, always proceed */ | |
493 | return 0; | |
494 | } | |
495 | ||
496 | /** | |
54d15714 | 497 | * arch_check_elf() - check an ELF executable |
774c105e PB |
498 | * @ehdr: The main ELF header |
499 | * @has_interp: True if the ELF has an interpreter, else false. | |
eb4bc076 | 500 | * @interp_ehdr: The interpreter's ELF header |
774c105e PB |
501 | * @state: Architecture-specific state preserved throughout the process |
502 | * of loading the ELF. | |
503 | * | |
504 | * Provides a final opportunity for architecture code to reject the loading | |
505 | * of the ELF & cause an exec syscall to return an error. This is called after | |
506 | * all program headers to be checked by arch_elf_pt_proc have been. | |
507 | * | |
508 | * Return: Zero to proceed with the ELF load, non-zero to fail the ELF load | |
509 | * with that return code. | |
510 | */ | |
511 | static inline int arch_check_elf(struct elfhdr *ehdr, bool has_interp, | |
eb4bc076 | 512 | struct elfhdr *interp_ehdr, |
774c105e PB |
513 | struct arch_elf_state *state) |
514 | { | |
515 | /* Dummy implementation, always proceed */ | |
516 | return 0; | |
517 | } | |
518 | ||
519 | #endif /* !CONFIG_ARCH_BINFMT_ELF_STATE */ | |
cc503c1b | 520 | |
1da177e4 LT |
521 | /* This is much more generalized than the library routine read function, |
522 | so we keep this separate. Technically the library read function | |
523 | is only provided so that we can read a.out libraries that have | |
524 | an ELF header */ | |
525 | ||
f4e5cc2c | 526 | static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex, |
cc503c1b | 527 | struct file *interpreter, unsigned long *interp_map_addr, |
a9d9ef13 | 528 | unsigned long no_base, struct elf_phdr *interp_elf_phdata) |
1da177e4 | 529 | { |
1da177e4 LT |
530 | struct elf_phdr *eppnt; |
531 | unsigned long load_addr = 0; | |
532 | int load_addr_set = 0; | |
533 | unsigned long last_bss = 0, elf_bss = 0; | |
16e72e9b | 534 | int bss_prot = 0; |
1da177e4 | 535 | unsigned long error = ~0UL; |
cc503c1b | 536 | unsigned long total_size; |
6a8d3894 | 537 | int i; |
1da177e4 LT |
538 | |
539 | /* First of all, some simple consistency checks */ | |
540 | if (interp_elf_ex->e_type != ET_EXEC && | |
541 | interp_elf_ex->e_type != ET_DYN) | |
542 | goto out; | |
543 | if (!elf_check_arch(interp_elf_ex)) | |
544 | goto out; | |
72c2d531 | 545 | if (!interpreter->f_op->mmap) |
1da177e4 LT |
546 | goto out; |
547 | ||
a9d9ef13 PB |
548 | total_size = total_mapping_size(interp_elf_phdata, |
549 | interp_elf_ex->e_phnum); | |
cc503c1b JK |
550 | if (!total_size) { |
551 | error = -EINVAL; | |
a9d9ef13 | 552 | goto out; |
cc503c1b JK |
553 | } |
554 | ||
a9d9ef13 | 555 | eppnt = interp_elf_phdata; |
f4e5cc2c JJ |
556 | for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) { |
557 | if (eppnt->p_type == PT_LOAD) { | |
558 | int elf_type = MAP_PRIVATE | MAP_DENYWRITE; | |
559 | int elf_prot = 0; | |
560 | unsigned long vaddr = 0; | |
561 | unsigned long k, map_addr; | |
562 | ||
563 | if (eppnt->p_flags & PF_R) | |
564 | elf_prot = PROT_READ; | |
565 | if (eppnt->p_flags & PF_W) | |
566 | elf_prot |= PROT_WRITE; | |
567 | if (eppnt->p_flags & PF_X) | |
568 | elf_prot |= PROT_EXEC; | |
569 | vaddr = eppnt->p_vaddr; | |
570 | if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) | |
571 | elf_type |= MAP_FIXED; | |
cc503c1b JK |
572 | else if (no_base && interp_elf_ex->e_type == ET_DYN) |
573 | load_addr = -vaddr; | |
f4e5cc2c JJ |
574 | |
575 | map_addr = elf_map(interpreter, load_addr + vaddr, | |
bb1ad820 | 576 | eppnt, elf_prot, elf_type, total_size); |
cc503c1b JK |
577 | total_size = 0; |
578 | if (!*interp_map_addr) | |
579 | *interp_map_addr = map_addr; | |
f4e5cc2c JJ |
580 | error = map_addr; |
581 | if (BAD_ADDR(map_addr)) | |
a9d9ef13 | 582 | goto out; |
f4e5cc2c JJ |
583 | |
584 | if (!load_addr_set && | |
585 | interp_elf_ex->e_type == ET_DYN) { | |
586 | load_addr = map_addr - ELF_PAGESTART(vaddr); | |
587 | load_addr_set = 1; | |
588 | } | |
589 | ||
590 | /* | |
591 | * Check to see if the section's size will overflow the | |
592 | * allowed task size. Note that p_filesz must always be | |
593 | * <= p_memsize so it's only necessary to check p_memsz. | |
594 | */ | |
595 | k = load_addr + eppnt->p_vaddr; | |
ce51059b | 596 | if (BAD_ADDR(k) || |
f4e5cc2c JJ |
597 | eppnt->p_filesz > eppnt->p_memsz || |
598 | eppnt->p_memsz > TASK_SIZE || | |
599 | TASK_SIZE - eppnt->p_memsz < k) { | |
600 | error = -ENOMEM; | |
a9d9ef13 | 601 | goto out; |
f4e5cc2c JJ |
602 | } |
603 | ||
604 | /* | |
605 | * Find the end of the file mapping for this phdr, and | |
606 | * keep track of the largest address we see for this. | |
607 | */ | |
608 | k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; | |
609 | if (k > elf_bss) | |
610 | elf_bss = k; | |
611 | ||
612 | /* | |
613 | * Do the same thing for the memory mapping - between | |
614 | * elf_bss and last_bss is the bss section. | |
615 | */ | |
0036d1f7 | 616 | k = load_addr + eppnt->p_vaddr + eppnt->p_memsz; |
16e72e9b | 617 | if (k > last_bss) { |
f4e5cc2c | 618 | last_bss = k; |
16e72e9b DV |
619 | bss_prot = elf_prot; |
620 | } | |
f4e5cc2c | 621 | } |
1da177e4 LT |
622 | } |
623 | ||
0036d1f7 KC |
624 | /* |
625 | * Now fill out the bss section: first pad the last page from | |
626 | * the file up to the page boundary, and zero it from elf_bss | |
627 | * up to the end of the page. | |
628 | */ | |
629 | if (padzero(elf_bss)) { | |
630 | error = -EFAULT; | |
631 | goto out; | |
632 | } | |
633 | /* | |
634 | * Next, align both the file and mem bss up to the page size, | |
635 | * since this is where elf_bss was just zeroed up to, and where | |
16e72e9b | 636 | * last_bss will end after the vm_brk_flags() below. |
0036d1f7 KC |
637 | */ |
638 | elf_bss = ELF_PAGEALIGN(elf_bss); | |
639 | last_bss = ELF_PAGEALIGN(last_bss); | |
640 | /* Finally, if there is still more bss to allocate, do it. */ | |
752015d1 | 641 | if (last_bss > elf_bss) { |
16e72e9b DV |
642 | error = vm_brk_flags(elf_bss, last_bss - elf_bss, |
643 | bss_prot & PROT_EXEC ? VM_EXEC : 0); | |
5d22fc25 | 644 | if (error) |
a9d9ef13 | 645 | goto out; |
1da177e4 LT |
646 | } |
647 | ||
cc503c1b | 648 | error = load_addr; |
1da177e4 LT |
649 | out: |
650 | return error; | |
651 | } | |
652 | ||
1da177e4 LT |
653 | /* |
654 | * These are the functions used to load ELF style executables and shared | |
655 | * libraries. There is no binary dependent code anywhere else. | |
656 | */ | |
657 | ||
913bd906 | 658 | #ifndef STACK_RND_MASK |
d1cabd63 | 659 | #define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) /* 8MB of VA */ |
913bd906 | 660 | #endif |
1da177e4 LT |
661 | |
662 | static unsigned long randomize_stack_top(unsigned long stack_top) | |
663 | { | |
4e7c22d4 | 664 | unsigned long random_variable = 0; |
1da177e4 | 665 | |
c16b63e0 AK |
666 | if ((current->flags & PF_RANDOMIZE) && |
667 | !(current->personality & ADDR_NO_RANDOMIZE)) { | |
5ef11c35 | 668 | random_variable = get_random_long(); |
4e7c22d4 | 669 | random_variable &= STACK_RND_MASK; |
913bd906 AK |
670 | random_variable <<= PAGE_SHIFT; |
671 | } | |
1da177e4 | 672 | #ifdef CONFIG_STACK_GROWSUP |
913bd906 | 673 | return PAGE_ALIGN(stack_top) + random_variable; |
1da177e4 | 674 | #else |
913bd906 | 675 | return PAGE_ALIGN(stack_top) - random_variable; |
1da177e4 LT |
676 | #endif |
677 | } | |
678 | ||
71613c3b | 679 | static int load_elf_binary(struct linux_binprm *bprm) |
1da177e4 LT |
680 | { |
681 | struct file *interpreter = NULL; /* to shut gcc up */ | |
682 | unsigned long load_addr = 0, load_bias = 0; | |
683 | int load_addr_set = 0; | |
684 | char * elf_interpreter = NULL; | |
1da177e4 | 685 | unsigned long error; |
a9d9ef13 | 686 | struct elf_phdr *elf_ppnt, *elf_phdata, *interp_elf_phdata = NULL; |
1da177e4 | 687 | unsigned long elf_bss, elf_brk; |
16e72e9b | 688 | int bss_prot = 0; |
1da177e4 | 689 | int retval, i; |
cc503c1b JK |
690 | unsigned long elf_entry; |
691 | unsigned long interp_load_addr = 0; | |
1da177e4 | 692 | unsigned long start_code, end_code, start_data, end_data; |
1a530a6f | 693 | unsigned long reloc_func_desc __maybe_unused = 0; |
8de61e69 | 694 | int executable_stack = EXSTACK_DEFAULT; |
71613c3b | 695 | struct pt_regs *regs = current_pt_regs(); |
1da177e4 LT |
696 | struct { |
697 | struct elfhdr elf_ex; | |
698 | struct elfhdr interp_elf_ex; | |
1da177e4 | 699 | } *loc; |
774c105e | 700 | struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE; |
1da177e4 LT |
701 | |
702 | loc = kmalloc(sizeof(*loc), GFP_KERNEL); | |
703 | if (!loc) { | |
704 | retval = -ENOMEM; | |
705 | goto out_ret; | |
706 | } | |
707 | ||
708 | /* Get the exec-header */ | |
f4e5cc2c | 709 | loc->elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4 LT |
710 | |
711 | retval = -ENOEXEC; | |
712 | /* First of all, some simple consistency checks */ | |
713 | if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
714 | goto out; | |
715 | ||
716 | if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN) | |
717 | goto out; | |
718 | if (!elf_check_arch(&loc->elf_ex)) | |
719 | goto out; | |
72c2d531 | 720 | if (!bprm->file->f_op->mmap) |
1da177e4 LT |
721 | goto out; |
722 | ||
6a8d3894 | 723 | elf_phdata = load_elf_phdrs(&loc->elf_ex, bprm->file); |
1da177e4 LT |
724 | if (!elf_phdata) |
725 | goto out; | |
726 | ||
1da177e4 LT |
727 | elf_ppnt = elf_phdata; |
728 | elf_bss = 0; | |
729 | elf_brk = 0; | |
730 | ||
731 | start_code = ~0UL; | |
732 | end_code = 0; | |
733 | start_data = 0; | |
734 | end_data = 0; | |
735 | ||
736 | for (i = 0; i < loc->elf_ex.e_phnum; i++) { | |
737 | if (elf_ppnt->p_type == PT_INTERP) { | |
738 | /* This is the program interpreter used for | |
739 | * shared libraries - for now assume that this | |
740 | * is an a.out format binary | |
741 | */ | |
1da177e4 LT |
742 | retval = -ENOEXEC; |
743 | if (elf_ppnt->p_filesz > PATH_MAX || | |
744 | elf_ppnt->p_filesz < 2) | |
e7b9b550 | 745 | goto out_free_ph; |
1da177e4 LT |
746 | |
747 | retval = -ENOMEM; | |
792db3af | 748 | elf_interpreter = kmalloc(elf_ppnt->p_filesz, |
f4e5cc2c | 749 | GFP_KERNEL); |
1da177e4 | 750 | if (!elf_interpreter) |
e7b9b550 | 751 | goto out_free_ph; |
1da177e4 LT |
752 | |
753 | retval = kernel_read(bprm->file, elf_ppnt->p_offset, | |
f4e5cc2c JJ |
754 | elf_interpreter, |
755 | elf_ppnt->p_filesz); | |
1da177e4 LT |
756 | if (retval != elf_ppnt->p_filesz) { |
757 | if (retval >= 0) | |
758 | retval = -EIO; | |
759 | goto out_free_interp; | |
760 | } | |
761 | /* make sure path is NULL terminated */ | |
762 | retval = -ENOEXEC; | |
763 | if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0') | |
764 | goto out_free_interp; | |
765 | ||
1da177e4 LT |
766 | interpreter = open_exec(elf_interpreter); |
767 | retval = PTR_ERR(interpreter); | |
768 | if (IS_ERR(interpreter)) | |
769 | goto out_free_interp; | |
1fb84496 AD |
770 | |
771 | /* | |
772 | * If the binary is not readable then enforce | |
773 | * mm->dumpable = 0 regardless of the interpreter's | |
774 | * permissions. | |
775 | */ | |
1b5d783c | 776 | would_dump(bprm, interpreter); |
1fb84496 | 777 | |
b582ef5c MR |
778 | /* Get the exec headers */ |
779 | retval = kernel_read(interpreter, 0, | |
780 | (void *)&loc->interp_elf_ex, | |
781 | sizeof(loc->interp_elf_ex)); | |
782 | if (retval != sizeof(loc->interp_elf_ex)) { | |
1da177e4 LT |
783 | if (retval >= 0) |
784 | retval = -EIO; | |
785 | goto out_free_dentry; | |
786 | } | |
787 | ||
1da177e4 LT |
788 | break; |
789 | } | |
790 | elf_ppnt++; | |
791 | } | |
792 | ||
793 | elf_ppnt = elf_phdata; | |
794 | for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) | |
774c105e PB |
795 | switch (elf_ppnt->p_type) { |
796 | case PT_GNU_STACK: | |
1da177e4 LT |
797 | if (elf_ppnt->p_flags & PF_X) |
798 | executable_stack = EXSTACK_ENABLE_X; | |
799 | else | |
800 | executable_stack = EXSTACK_DISABLE_X; | |
801 | break; | |
774c105e PB |
802 | |
803 | case PT_LOPROC ... PT_HIPROC: | |
804 | retval = arch_elf_pt_proc(&loc->elf_ex, elf_ppnt, | |
805 | bprm->file, false, | |
806 | &arch_state); | |
807 | if (retval) | |
808 | goto out_free_dentry; | |
809 | break; | |
1da177e4 | 810 | } |
1da177e4 LT |
811 | |
812 | /* Some simple consistency checks for the interpreter */ | |
813 | if (elf_interpreter) { | |
1da177e4 | 814 | retval = -ELIBBAD; |
d20894a2 AK |
815 | /* Not an ELF interpreter */ |
816 | if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1da177e4 | 817 | goto out_free_dentry; |
1da177e4 | 818 | /* Verify the interpreter has a valid arch */ |
d20894a2 | 819 | if (!elf_check_arch(&loc->interp_elf_ex)) |
1da177e4 | 820 | goto out_free_dentry; |
a9d9ef13 PB |
821 | |
822 | /* Load the interpreter program headers */ | |
823 | interp_elf_phdata = load_elf_phdrs(&loc->interp_elf_ex, | |
824 | interpreter); | |
825 | if (!interp_elf_phdata) | |
826 | goto out_free_dentry; | |
774c105e PB |
827 | |
828 | /* Pass PT_LOPROC..PT_HIPROC headers to arch code */ | |
829 | elf_ppnt = interp_elf_phdata; | |
830 | for (i = 0; i < loc->interp_elf_ex.e_phnum; i++, elf_ppnt++) | |
831 | switch (elf_ppnt->p_type) { | |
832 | case PT_LOPROC ... PT_HIPROC: | |
833 | retval = arch_elf_pt_proc(&loc->interp_elf_ex, | |
834 | elf_ppnt, interpreter, | |
835 | true, &arch_state); | |
836 | if (retval) | |
837 | goto out_free_dentry; | |
838 | break; | |
839 | } | |
1da177e4 LT |
840 | } |
841 | ||
774c105e PB |
842 | /* |
843 | * Allow arch code to reject the ELF at this point, whilst it's | |
844 | * still possible to return an error to the code that invoked | |
845 | * the exec syscall. | |
846 | */ | |
eb4bc076 MR |
847 | retval = arch_check_elf(&loc->elf_ex, |
848 | !!interpreter, &loc->interp_elf_ex, | |
849 | &arch_state); | |
774c105e PB |
850 | if (retval) |
851 | goto out_free_dentry; | |
852 | ||
1da177e4 LT |
853 | /* Flush all traces of the currently running executable */ |
854 | retval = flush_old_exec(bprm); | |
855 | if (retval) | |
856 | goto out_free_dentry; | |
857 | ||
1da177e4 LT |
858 | /* Do this immediately, since STACK_TOP as used in setup_arg_pages |
859 | may depend on the personality. */ | |
774c105e | 860 | SET_PERSONALITY2(loc->elf_ex, &arch_state); |
1da177e4 LT |
861 | if (elf_read_implies_exec(loc->elf_ex, executable_stack)) |
862 | current->personality |= READ_IMPLIES_EXEC; | |
863 | ||
f4e5cc2c | 864 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
1da177e4 | 865 | current->flags |= PF_RANDOMIZE; |
221af7f8 LT |
866 | |
867 | setup_new_exec(bprm); | |
9f834ec1 | 868 | install_exec_creds(bprm); |
1da177e4 LT |
869 | |
870 | /* Do this so that we can load the interpreter, if need be. We will | |
871 | change some of these later */ | |
1da177e4 LT |
872 | retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP), |
873 | executable_stack); | |
19d860a1 | 874 | if (retval < 0) |
1da177e4 | 875 | goto out_free_dentry; |
1da177e4 | 876 | |
1da177e4 LT |
877 | current->mm->start_stack = bprm->p; |
878 | ||
af901ca1 | 879 | /* Now we do a little grungy work by mmapping the ELF image into |
cc503c1b | 880 | the correct location in memory. */ |
f4e5cc2c JJ |
881 | for(i = 0, elf_ppnt = elf_phdata; |
882 | i < loc->elf_ex.e_phnum; i++, elf_ppnt++) { | |
1da177e4 LT |
883 | int elf_prot = 0, elf_flags; |
884 | unsigned long k, vaddr; | |
a87938b2 | 885 | unsigned long total_size = 0; |
1da177e4 LT |
886 | |
887 | if (elf_ppnt->p_type != PT_LOAD) | |
888 | continue; | |
889 | ||
890 | if (unlikely (elf_brk > elf_bss)) { | |
891 | unsigned long nbyte; | |
892 | ||
893 | /* There was a PT_LOAD segment with p_memsz > p_filesz | |
894 | before this one. Map anonymous pages, if needed, | |
895 | and clear the area. */ | |
f670d0ec | 896 | retval = set_brk(elf_bss + load_bias, |
16e72e9b DV |
897 | elf_brk + load_bias, |
898 | bss_prot); | |
19d860a1 | 899 | if (retval) |
1da177e4 | 900 | goto out_free_dentry; |
1da177e4 LT |
901 | nbyte = ELF_PAGEOFFSET(elf_bss); |
902 | if (nbyte) { | |
903 | nbyte = ELF_MIN_ALIGN - nbyte; | |
904 | if (nbyte > elf_brk - elf_bss) | |
905 | nbyte = elf_brk - elf_bss; | |
906 | if (clear_user((void __user *)elf_bss + | |
907 | load_bias, nbyte)) { | |
908 | /* | |
909 | * This bss-zeroing can fail if the ELF | |
f4e5cc2c | 910 | * file specifies odd protections. So |
1da177e4 LT |
911 | * we don't check the return value |
912 | */ | |
913 | } | |
914 | } | |
915 | } | |
916 | ||
f4e5cc2c JJ |
917 | if (elf_ppnt->p_flags & PF_R) |
918 | elf_prot |= PROT_READ; | |
919 | if (elf_ppnt->p_flags & PF_W) | |
920 | elf_prot |= PROT_WRITE; | |
921 | if (elf_ppnt->p_flags & PF_X) | |
922 | elf_prot |= PROT_EXEC; | |
1da177e4 | 923 | |
f4e5cc2c | 924 | elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE; |
1da177e4 LT |
925 | |
926 | vaddr = elf_ppnt->p_vaddr; | |
927 | if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) { | |
928 | elf_flags |= MAP_FIXED; | |
929 | } else if (loc->elf_ex.e_type == ET_DYN) { | |
f4e5cc2c JJ |
930 | /* Try and get dynamic programs out of the way of the |
931 | * default mmap base, as well as whatever program they | |
932 | * might try to exec. This is because the brk will | |
933 | * follow the loader, and is not movable. */ | |
d1fd836d | 934 | load_bias = ELF_ET_DYN_BASE - vaddr; |
a3defbe5 | 935 | if (current->flags & PF_RANDOMIZE) |
d1fd836d KC |
936 | load_bias += arch_mmap_rnd(); |
937 | load_bias = ELF_PAGESTART(load_bias); | |
a87938b2 MD |
938 | total_size = total_mapping_size(elf_phdata, |
939 | loc->elf_ex.e_phnum); | |
940 | if (!total_size) { | |
2b1d3ae9 | 941 | retval = -EINVAL; |
a87938b2 MD |
942 | goto out_free_dentry; |
943 | } | |
1da177e4 LT |
944 | } |
945 | ||
f4e5cc2c | 946 | error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, |
a87938b2 | 947 | elf_prot, elf_flags, total_size); |
1da177e4 | 948 | if (BAD_ADDR(error)) { |
b140f251 AK |
949 | retval = IS_ERR((void *)error) ? |
950 | PTR_ERR((void*)error) : -EINVAL; | |
1da177e4 LT |
951 | goto out_free_dentry; |
952 | } | |
953 | ||
954 | if (!load_addr_set) { | |
955 | load_addr_set = 1; | |
956 | load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset); | |
957 | if (loc->elf_ex.e_type == ET_DYN) { | |
958 | load_bias += error - | |
959 | ELF_PAGESTART(load_bias + vaddr); | |
960 | load_addr += load_bias; | |
961 | reloc_func_desc = load_bias; | |
962 | } | |
963 | } | |
964 | k = elf_ppnt->p_vaddr; | |
f4e5cc2c JJ |
965 | if (k < start_code) |
966 | start_code = k; | |
967 | if (start_data < k) | |
968 | start_data = k; | |
1da177e4 LT |
969 | |
970 | /* | |
971 | * Check to see if the section's size will overflow the | |
972 | * allowed task size. Note that p_filesz must always be | |
973 | * <= p_memsz so it is only necessary to check p_memsz. | |
974 | */ | |
ce51059b | 975 | if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz || |
1da177e4 LT |
976 | elf_ppnt->p_memsz > TASK_SIZE || |
977 | TASK_SIZE - elf_ppnt->p_memsz < k) { | |
f4e5cc2c | 978 | /* set_brk can never work. Avoid overflows. */ |
b140f251 | 979 | retval = -EINVAL; |
1da177e4 LT |
980 | goto out_free_dentry; |
981 | } | |
982 | ||
983 | k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; | |
984 | ||
985 | if (k > elf_bss) | |
986 | elf_bss = k; | |
987 | if ((elf_ppnt->p_flags & PF_X) && end_code < k) | |
988 | end_code = k; | |
989 | if (end_data < k) | |
990 | end_data = k; | |
991 | k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; | |
16e72e9b DV |
992 | if (k > elf_brk) { |
993 | bss_prot = elf_prot; | |
1da177e4 | 994 | elf_brk = k; |
16e72e9b | 995 | } |
1da177e4 LT |
996 | } |
997 | ||
998 | loc->elf_ex.e_entry += load_bias; | |
999 | elf_bss += load_bias; | |
1000 | elf_brk += load_bias; | |
1001 | start_code += load_bias; | |
1002 | end_code += load_bias; | |
1003 | start_data += load_bias; | |
1004 | end_data += load_bias; | |
1005 | ||
1006 | /* Calling set_brk effectively mmaps the pages that we need | |
1007 | * for the bss and break sections. We must do this before | |
1008 | * mapping in the interpreter, to make sure it doesn't wind | |
1009 | * up getting placed where the bss needs to go. | |
1010 | */ | |
16e72e9b | 1011 | retval = set_brk(elf_bss, elf_brk, bss_prot); |
19d860a1 | 1012 | if (retval) |
1da177e4 | 1013 | goto out_free_dentry; |
6de50517 | 1014 | if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) { |
1da177e4 LT |
1015 | retval = -EFAULT; /* Nobody gets to see this, but.. */ |
1016 | goto out_free_dentry; | |
1017 | } | |
1018 | ||
1019 | if (elf_interpreter) { | |
6eec482f | 1020 | unsigned long interp_map_addr = 0; |
d20894a2 AK |
1021 | |
1022 | elf_entry = load_elf_interp(&loc->interp_elf_ex, | |
1023 | interpreter, | |
1024 | &interp_map_addr, | |
a9d9ef13 | 1025 | load_bias, interp_elf_phdata); |
d20894a2 AK |
1026 | if (!IS_ERR((void *)elf_entry)) { |
1027 | /* | |
1028 | * load_elf_interp() returns relocation | |
1029 | * adjustment | |
1030 | */ | |
1031 | interp_load_addr = elf_entry; | |
1032 | elf_entry += loc->interp_elf_ex.e_entry; | |
cc503c1b | 1033 | } |
1da177e4 | 1034 | if (BAD_ADDR(elf_entry)) { |
ce51059b CE |
1035 | retval = IS_ERR((void *)elf_entry) ? |
1036 | (int)elf_entry : -EINVAL; | |
1da177e4 LT |
1037 | goto out_free_dentry; |
1038 | } | |
1039 | reloc_func_desc = interp_load_addr; | |
1040 | ||
1041 | allow_write_access(interpreter); | |
1042 | fput(interpreter); | |
1043 | kfree(elf_interpreter); | |
1044 | } else { | |
1045 | elf_entry = loc->elf_ex.e_entry; | |
5342fba5 | 1046 | if (BAD_ADDR(elf_entry)) { |
ce51059b | 1047 | retval = -EINVAL; |
5342fba5 SS |
1048 | goto out_free_dentry; |
1049 | } | |
1da177e4 LT |
1050 | } |
1051 | ||
774c105e | 1052 | kfree(interp_elf_phdata); |
1da177e4 LT |
1053 | kfree(elf_phdata); |
1054 | ||
1da177e4 LT |
1055 | set_binfmt(&elf_format); |
1056 | ||
547ee84c | 1057 | #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
fc5243d9 | 1058 | retval = arch_setup_additional_pages(bprm, !!elf_interpreter); |
19d860a1 | 1059 | if (retval < 0) |
18c8baff | 1060 | goto out; |
547ee84c BH |
1061 | #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */ |
1062 | ||
b6a2fea3 | 1063 | retval = create_elf_tables(bprm, &loc->elf_ex, |
f4e5cc2c | 1064 | load_addr, interp_load_addr); |
19d860a1 | 1065 | if (retval < 0) |
b6a2fea3 | 1066 | goto out; |
1da177e4 | 1067 | /* N.B. passed_fileno might not be initialized? */ |
1da177e4 LT |
1068 | current->mm->end_code = end_code; |
1069 | current->mm->start_code = start_code; | |
1070 | current->mm->start_data = start_data; | |
1071 | current->mm->end_data = end_data; | |
1072 | current->mm->start_stack = bprm->p; | |
1073 | ||
4471a675 | 1074 | if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) { |
c1d171a0 JK |
1075 | current->mm->brk = current->mm->start_brk = |
1076 | arch_randomize_brk(current->mm); | |
204db6ed | 1077 | #ifdef compat_brk_randomized |
4471a675 JK |
1078 | current->brk_randomized = 1; |
1079 | #endif | |
1080 | } | |
c1d171a0 | 1081 | |
1da177e4 LT |
1082 | if (current->personality & MMAP_PAGE_ZERO) { |
1083 | /* Why this, you ask??? Well SVr4 maps page 0 as read-only, | |
1084 | and some applications "depend" upon this behavior. | |
1085 | Since we do not have the power to recompile these, we | |
f4e5cc2c | 1086 | emulate the SVr4 behavior. Sigh. */ |
6be5ceb0 | 1087 | error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC, |
1da177e4 | 1088 | MAP_FIXED | MAP_PRIVATE, 0); |
1da177e4 LT |
1089 | } |
1090 | ||
1091 | #ifdef ELF_PLAT_INIT | |
1092 | /* | |
1093 | * The ABI may specify that certain registers be set up in special | |
1094 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
1095 | * example. In addition, it may also specify (eg, PowerPC64 ELF) | |
1096 | * that the e_entry field is the address of the function descriptor | |
1097 | * for the startup routine, rather than the address of the startup | |
1098 | * routine itself. This macro performs whatever initialization to | |
1099 | * the regs structure is required as well as any relocations to the | |
1100 | * function descriptor entries when executing dynamically links apps. | |
1101 | */ | |
1102 | ELF_PLAT_INIT(regs, reloc_func_desc); | |
1103 | #endif | |
1104 | ||
1105 | start_thread(regs, elf_entry, bprm->p); | |
1da177e4 LT |
1106 | retval = 0; |
1107 | out: | |
1108 | kfree(loc); | |
1109 | out_ret: | |
1110 | return retval; | |
1111 | ||
1112 | /* error cleanup */ | |
1113 | out_free_dentry: | |
a9d9ef13 | 1114 | kfree(interp_elf_phdata); |
1da177e4 LT |
1115 | allow_write_access(interpreter); |
1116 | if (interpreter) | |
1117 | fput(interpreter); | |
1118 | out_free_interp: | |
f99d49ad | 1119 | kfree(elf_interpreter); |
1da177e4 LT |
1120 | out_free_ph: |
1121 | kfree(elf_phdata); | |
1122 | goto out; | |
1123 | } | |
1124 | ||
69369a70 | 1125 | #ifdef CONFIG_USELIB |
1da177e4 LT |
1126 | /* This is really simpleminded and specialized - we are loading an |
1127 | a.out library that is given an ELF header. */ | |
1da177e4 LT |
1128 | static int load_elf_library(struct file *file) |
1129 | { | |
1130 | struct elf_phdr *elf_phdata; | |
1131 | struct elf_phdr *eppnt; | |
1132 | unsigned long elf_bss, bss, len; | |
1133 | int retval, error, i, j; | |
1134 | struct elfhdr elf_ex; | |
1135 | ||
1136 | error = -ENOEXEC; | |
f4e5cc2c | 1137 | retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex)); |
1da177e4 LT |
1138 | if (retval != sizeof(elf_ex)) |
1139 | goto out; | |
1140 | ||
1141 | if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1142 | goto out; | |
1143 | ||
1144 | /* First of all, some simple consistency checks */ | |
1145 | if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 || | |
72c2d531 | 1146 | !elf_check_arch(&elf_ex) || !file->f_op->mmap) |
1da177e4 LT |
1147 | goto out; |
1148 | ||
1149 | /* Now read in all of the header information */ | |
1150 | ||
1151 | j = sizeof(struct elf_phdr) * elf_ex.e_phnum; | |
1152 | /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */ | |
1153 | ||
1154 | error = -ENOMEM; | |
1155 | elf_phdata = kmalloc(j, GFP_KERNEL); | |
1156 | if (!elf_phdata) | |
1157 | goto out; | |
1158 | ||
1159 | eppnt = elf_phdata; | |
1160 | error = -ENOEXEC; | |
1161 | retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j); | |
1162 | if (retval != j) | |
1163 | goto out_free_ph; | |
1164 | ||
1165 | for (j = 0, i = 0; i<elf_ex.e_phnum; i++) | |
1166 | if ((eppnt + i)->p_type == PT_LOAD) | |
1167 | j++; | |
1168 | if (j != 1) | |
1169 | goto out_free_ph; | |
1170 | ||
1171 | while (eppnt->p_type != PT_LOAD) | |
1172 | eppnt++; | |
1173 | ||
1174 | /* Now use mmap to map the library into memory. */ | |
6be5ceb0 | 1175 | error = vm_mmap(file, |
1da177e4 LT |
1176 | ELF_PAGESTART(eppnt->p_vaddr), |
1177 | (eppnt->p_filesz + | |
1178 | ELF_PAGEOFFSET(eppnt->p_vaddr)), | |
1179 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
1180 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, | |
1181 | (eppnt->p_offset - | |
1182 | ELF_PAGEOFFSET(eppnt->p_vaddr))); | |
1da177e4 LT |
1183 | if (error != ELF_PAGESTART(eppnt->p_vaddr)) |
1184 | goto out_free_ph; | |
1185 | ||
1186 | elf_bss = eppnt->p_vaddr + eppnt->p_filesz; | |
1187 | if (padzero(elf_bss)) { | |
1188 | error = -EFAULT; | |
1189 | goto out_free_ph; | |
1190 | } | |
1191 | ||
f4e5cc2c JJ |
1192 | len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + |
1193 | ELF_MIN_ALIGN - 1); | |
1da177e4 | 1194 | bss = eppnt->p_memsz + eppnt->p_vaddr; |
ecc2bc8a MH |
1195 | if (bss > len) { |
1196 | error = vm_brk(len, bss - len); | |
5d22fc25 | 1197 | if (error) |
ecc2bc8a MH |
1198 | goto out_free_ph; |
1199 | } | |
1da177e4 LT |
1200 | error = 0; |
1201 | ||
1202 | out_free_ph: | |
1203 | kfree(elf_phdata); | |
1204 | out: | |
1205 | return error; | |
1206 | } | |
69369a70 | 1207 | #endif /* #ifdef CONFIG_USELIB */ |
1da177e4 | 1208 | |
698ba7b5 | 1209 | #ifdef CONFIG_ELF_CORE |
1da177e4 LT |
1210 | /* |
1211 | * ELF core dumper | |
1212 | * | |
1213 | * Modelled on fs/exec.c:aout_core_dump() | |
1214 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1215 | */ | |
1da177e4 | 1216 | |
909af768 JB |
1217 | /* |
1218 | * The purpose of always_dump_vma() is to make sure that special kernel mappings | |
1219 | * that are useful for post-mortem analysis are included in every core dump. | |
1220 | * In that way we ensure that the core dump is fully interpretable later | |
1221 | * without matching up the same kernel and hardware config to see what PC values | |
1222 | * meant. These special mappings include - vDSO, vsyscall, and other | |
1223 | * architecture specific mappings | |
1224 | */ | |
1225 | static bool always_dump_vma(struct vm_area_struct *vma) | |
1226 | { | |
1227 | /* Any vsyscall mappings? */ | |
1228 | if (vma == get_gate_vma(vma->vm_mm)) | |
1229 | return true; | |
78d683e8 AL |
1230 | |
1231 | /* | |
1232 | * Assume that all vmas with a .name op should always be dumped. | |
1233 | * If this changes, a new vm_ops field can easily be added. | |
1234 | */ | |
1235 | if (vma->vm_ops && vma->vm_ops->name && vma->vm_ops->name(vma)) | |
1236 | return true; | |
1237 | ||
909af768 JB |
1238 | /* |
1239 | * arch_vma_name() returns non-NULL for special architecture mappings, | |
1240 | * such as vDSO sections. | |
1241 | */ | |
1242 | if (arch_vma_name(vma)) | |
1243 | return true; | |
1244 | ||
1245 | return false; | |
1246 | } | |
1247 | ||
1da177e4 | 1248 | /* |
82df3973 | 1249 | * Decide what to dump of a segment, part, all or none. |
1da177e4 | 1250 | */ |
82df3973 RM |
1251 | static unsigned long vma_dump_size(struct vm_area_struct *vma, |
1252 | unsigned long mm_flags) | |
1da177e4 | 1253 | { |
e575f111 KM |
1254 | #define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type)) |
1255 | ||
909af768 JB |
1256 | /* always dump the vdso and vsyscall sections */ |
1257 | if (always_dump_vma(vma)) | |
82df3973 | 1258 | goto whole; |
e5b97dde | 1259 | |
0103bd16 | 1260 | if (vma->vm_flags & VM_DONTDUMP) |
accb61fe JB |
1261 | return 0; |
1262 | ||
5037835c RZ |
1263 | /* support for DAX */ |
1264 | if (vma_is_dax(vma)) { | |
1265 | if ((vma->vm_flags & VM_SHARED) && FILTER(DAX_SHARED)) | |
1266 | goto whole; | |
1267 | if (!(vma->vm_flags & VM_SHARED) && FILTER(DAX_PRIVATE)) | |
1268 | goto whole; | |
1269 | return 0; | |
1270 | } | |
1271 | ||
e575f111 KM |
1272 | /* Hugetlb memory check */ |
1273 | if (vma->vm_flags & VM_HUGETLB) { | |
1274 | if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED)) | |
1275 | goto whole; | |
1276 | if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE)) | |
1277 | goto whole; | |
23d9e482 | 1278 | return 0; |
e575f111 KM |
1279 | } |
1280 | ||
1da177e4 | 1281 | /* Do not dump I/O mapped devices or special mappings */ |
314e51b9 | 1282 | if (vma->vm_flags & VM_IO) |
1da177e4 LT |
1283 | return 0; |
1284 | ||
a1b59e80 KH |
1285 | /* By default, dump shared memory if mapped from an anonymous file. */ |
1286 | if (vma->vm_flags & VM_SHARED) { | |
496ad9aa | 1287 | if (file_inode(vma->vm_file)->i_nlink == 0 ? |
82df3973 RM |
1288 | FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED)) |
1289 | goto whole; | |
1290 | return 0; | |
a1b59e80 | 1291 | } |
1da177e4 | 1292 | |
82df3973 RM |
1293 | /* Dump segments that have been written to. */ |
1294 | if (vma->anon_vma && FILTER(ANON_PRIVATE)) | |
1295 | goto whole; | |
1296 | if (vma->vm_file == NULL) | |
1297 | return 0; | |
1da177e4 | 1298 | |
82df3973 RM |
1299 | if (FILTER(MAPPED_PRIVATE)) |
1300 | goto whole; | |
1301 | ||
1302 | /* | |
1303 | * If this looks like the beginning of a DSO or executable mapping, | |
1304 | * check for an ELF header. If we find one, dump the first page to | |
1305 | * aid in determining what was mapped here. | |
1306 | */ | |
92dc07b1 RM |
1307 | if (FILTER(ELF_HEADERS) && |
1308 | vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) { | |
82df3973 RM |
1309 | u32 __user *header = (u32 __user *) vma->vm_start; |
1310 | u32 word; | |
92dc07b1 | 1311 | mm_segment_t fs = get_fs(); |
82df3973 RM |
1312 | /* |
1313 | * Doing it this way gets the constant folded by GCC. | |
1314 | */ | |
1315 | union { | |
1316 | u32 cmp; | |
1317 | char elfmag[SELFMAG]; | |
1318 | } magic; | |
1319 | BUILD_BUG_ON(SELFMAG != sizeof word); | |
1320 | magic.elfmag[EI_MAG0] = ELFMAG0; | |
1321 | magic.elfmag[EI_MAG1] = ELFMAG1; | |
1322 | magic.elfmag[EI_MAG2] = ELFMAG2; | |
1323 | magic.elfmag[EI_MAG3] = ELFMAG3; | |
92dc07b1 RM |
1324 | /* |
1325 | * Switch to the user "segment" for get_user(), | |
1326 | * then put back what elf_core_dump() had in place. | |
1327 | */ | |
1328 | set_fs(USER_DS); | |
1329 | if (unlikely(get_user(word, header))) | |
1330 | word = 0; | |
1331 | set_fs(fs); | |
1332 | if (word == magic.cmp) | |
82df3973 RM |
1333 | return PAGE_SIZE; |
1334 | } | |
1335 | ||
1336 | #undef FILTER | |
1337 | ||
1338 | return 0; | |
1339 | ||
1340 | whole: | |
1341 | return vma->vm_end - vma->vm_start; | |
1da177e4 LT |
1342 | } |
1343 | ||
1da177e4 LT |
1344 | /* An ELF note in memory */ |
1345 | struct memelfnote | |
1346 | { | |
1347 | const char *name; | |
1348 | int type; | |
1349 | unsigned int datasz; | |
1350 | void *data; | |
1351 | }; | |
1352 | ||
1353 | static int notesize(struct memelfnote *en) | |
1354 | { | |
1355 | int sz; | |
1356 | ||
1357 | sz = sizeof(struct elf_note); | |
1358 | sz += roundup(strlen(en->name) + 1, 4); | |
1359 | sz += roundup(en->datasz, 4); | |
1360 | ||
1361 | return sz; | |
1362 | } | |
1363 | ||
ecc8c772 | 1364 | static int writenote(struct memelfnote *men, struct coredump_params *cprm) |
d025c9db AK |
1365 | { |
1366 | struct elf_note en; | |
1da177e4 LT |
1367 | en.n_namesz = strlen(men->name) + 1; |
1368 | en.n_descsz = men->datasz; | |
1369 | en.n_type = men->type; | |
1370 | ||
ecc8c772 | 1371 | return dump_emit(cprm, &en, sizeof(en)) && |
22a8cb82 AV |
1372 | dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) && |
1373 | dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4); | |
1da177e4 | 1374 | } |
1da177e4 | 1375 | |
3aba481f | 1376 | static void fill_elf_header(struct elfhdr *elf, int segs, |
d3330cf0 | 1377 | u16 machine, u32 flags) |
1da177e4 | 1378 | { |
6970c8ef CG |
1379 | memset(elf, 0, sizeof(*elf)); |
1380 | ||
1da177e4 LT |
1381 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
1382 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1383 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1384 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1385 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1da177e4 LT |
1386 | |
1387 | elf->e_type = ET_CORE; | |
3aba481f | 1388 | elf->e_machine = machine; |
1da177e4 | 1389 | elf->e_version = EV_CURRENT; |
1da177e4 | 1390 | elf->e_phoff = sizeof(struct elfhdr); |
3aba481f | 1391 | elf->e_flags = flags; |
1da177e4 LT |
1392 | elf->e_ehsize = sizeof(struct elfhdr); |
1393 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1394 | elf->e_phnum = segs; | |
6970c8ef | 1395 | |
1da177e4 LT |
1396 | return; |
1397 | } | |
1398 | ||
8d6b5eee | 1399 | static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1da177e4 LT |
1400 | { |
1401 | phdr->p_type = PT_NOTE; | |
1402 | phdr->p_offset = offset; | |
1403 | phdr->p_vaddr = 0; | |
1404 | phdr->p_paddr = 0; | |
1405 | phdr->p_filesz = sz; | |
1406 | phdr->p_memsz = 0; | |
1407 | phdr->p_flags = 0; | |
1408 | phdr->p_align = 0; | |
1409 | return; | |
1410 | } | |
1411 | ||
1412 | static void fill_note(struct memelfnote *note, const char *name, int type, | |
1413 | unsigned int sz, void *data) | |
1414 | { | |
1415 | note->name = name; | |
1416 | note->type = type; | |
1417 | note->datasz = sz; | |
1418 | note->data = data; | |
1419 | return; | |
1420 | } | |
1421 | ||
1422 | /* | |
f4e5cc2c JJ |
1423 | * fill up all the fields in prstatus from the given task struct, except |
1424 | * registers which need to be filled up separately. | |
1da177e4 LT |
1425 | */ |
1426 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
f4e5cc2c | 1427 | struct task_struct *p, long signr) |
1da177e4 LT |
1428 | { |
1429 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1430 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1431 | prstatus->pr_sighold = p->blocked.sig[0]; | |
3b34fc58 ON |
1432 | rcu_read_lock(); |
1433 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1434 | rcu_read_unlock(); | |
b488893a | 1435 | prstatus->pr_pid = task_pid_vnr(p); |
b488893a PE |
1436 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1437 | prstatus->pr_sid = task_session_vnr(p); | |
1da177e4 | 1438 | if (thread_group_leader(p)) { |
cd19c364 | 1439 | struct task_cputime cputime; |
f06febc9 | 1440 | |
1da177e4 | 1441 | /* |
f06febc9 FM |
1442 | * This is the record for the group leader. It shows the |
1443 | * group-wide total, not its individual thread total. | |
1da177e4 | 1444 | */ |
cd19c364 FW |
1445 | thread_group_cputime(p, &cputime); |
1446 | prstatus->pr_utime = ns_to_timeval(cputime.utime); | |
1447 | prstatus->pr_stime = ns_to_timeval(cputime.stime); | |
1da177e4 | 1448 | } else { |
cd19c364 | 1449 | u64 utime, stime; |
6fac4829 | 1450 | |
cd19c364 FW |
1451 | task_cputime(p, &utime, &stime); |
1452 | prstatus->pr_utime = ns_to_timeval(utime); | |
1453 | prstatus->pr_stime = ns_to_timeval(stime); | |
1da177e4 | 1454 | } |
5613fda9 | 1455 | |
cd19c364 FW |
1456 | prstatus->pr_cutime = ns_to_timeval(p->signal->cutime); |
1457 | prstatus->pr_cstime = ns_to_timeval(p->signal->cstime); | |
1da177e4 LT |
1458 | } |
1459 | ||
1460 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1461 | struct mm_struct *mm) | |
1462 | { | |
c69e8d9c | 1463 | const struct cred *cred; |
a84a5059 | 1464 | unsigned int i, len; |
1da177e4 LT |
1465 | |
1466 | /* first copy the parameters from user space */ | |
1467 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1468 | ||
1469 | len = mm->arg_end - mm->arg_start; | |
1470 | if (len >= ELF_PRARGSZ) | |
1471 | len = ELF_PRARGSZ-1; | |
1472 | if (copy_from_user(&psinfo->pr_psargs, | |
1473 | (const char __user *)mm->arg_start, len)) | |
1474 | return -EFAULT; | |
1475 | for(i = 0; i < len; i++) | |
1476 | if (psinfo->pr_psargs[i] == 0) | |
1477 | psinfo->pr_psargs[i] = ' '; | |
1478 | psinfo->pr_psargs[len] = 0; | |
1479 | ||
3b34fc58 ON |
1480 | rcu_read_lock(); |
1481 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1482 | rcu_read_unlock(); | |
b488893a | 1483 | psinfo->pr_pid = task_pid_vnr(p); |
b488893a PE |
1484 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1485 | psinfo->pr_sid = task_session_vnr(p); | |
1da177e4 LT |
1486 | |
1487 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1488 | psinfo->pr_state = i; | |
55148548 | 1489 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1da177e4 LT |
1490 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
1491 | psinfo->pr_nice = task_nice(p); | |
1492 | psinfo->pr_flag = p->flags; | |
c69e8d9c DH |
1493 | rcu_read_lock(); |
1494 | cred = __task_cred(p); | |
ebc887b2 EB |
1495 | SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); |
1496 | SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid)); | |
c69e8d9c | 1497 | rcu_read_unlock(); |
1da177e4 LT |
1498 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1499 | ||
1500 | return 0; | |
1501 | } | |
1502 | ||
3aba481f RM |
1503 | static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm) |
1504 | { | |
1505 | elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv; | |
1506 | int i = 0; | |
1507 | do | |
1508 | i += 2; | |
1509 | while (auxv[i - 2] != AT_NULL); | |
1510 | fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv); | |
1511 | } | |
1512 | ||
49ae4d4b | 1513 | static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata, |
ce395960 | 1514 | const siginfo_t *siginfo) |
49ae4d4b DV |
1515 | { |
1516 | mm_segment_t old_fs = get_fs(); | |
1517 | set_fs(KERNEL_DS); | |
1518 | copy_siginfo_to_user((user_siginfo_t __user *) csigdata, siginfo); | |
1519 | set_fs(old_fs); | |
1520 | fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata); | |
1521 | } | |
1522 | ||
2aa362c4 DV |
1523 | #define MAX_FILE_NOTE_SIZE (4*1024*1024) |
1524 | /* | |
1525 | * Format of NT_FILE note: | |
1526 | * | |
1527 | * long count -- how many files are mapped | |
1528 | * long page_size -- units for file_ofs | |
1529 | * array of [COUNT] elements of | |
1530 | * long start | |
1531 | * long end | |
1532 | * long file_ofs | |
1533 | * followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL... | |
1534 | */ | |
72023656 | 1535 | static int fill_files_note(struct memelfnote *note) |
2aa362c4 DV |
1536 | { |
1537 | struct vm_area_struct *vma; | |
1538 | unsigned count, size, names_ofs, remaining, n; | |
1539 | user_long_t *data; | |
1540 | user_long_t *start_end_ofs; | |
1541 | char *name_base, *name_curpos; | |
1542 | ||
1543 | /* *Estimated* file count and total data size needed */ | |
1544 | count = current->mm->map_count; | |
1545 | size = count * 64; | |
1546 | ||
1547 | names_ofs = (2 + 3 * count) * sizeof(data[0]); | |
1548 | alloc: | |
1549 | if (size >= MAX_FILE_NOTE_SIZE) /* paranoia check */ | |
72023656 | 1550 | return -EINVAL; |
2aa362c4 DV |
1551 | size = round_up(size, PAGE_SIZE); |
1552 | data = vmalloc(size); | |
1553 | if (!data) | |
72023656 | 1554 | return -ENOMEM; |
2aa362c4 DV |
1555 | |
1556 | start_end_ofs = data + 2; | |
1557 | name_base = name_curpos = ((char *)data) + names_ofs; | |
1558 | remaining = size - names_ofs; | |
1559 | count = 0; | |
1560 | for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) { | |
1561 | struct file *file; | |
1562 | const char *filename; | |
1563 | ||
1564 | file = vma->vm_file; | |
1565 | if (!file) | |
1566 | continue; | |
9bf39ab2 | 1567 | filename = file_path(file, name_curpos, remaining); |
2aa362c4 DV |
1568 | if (IS_ERR(filename)) { |
1569 | if (PTR_ERR(filename) == -ENAMETOOLONG) { | |
1570 | vfree(data); | |
1571 | size = size * 5 / 4; | |
1572 | goto alloc; | |
1573 | } | |
1574 | continue; | |
1575 | } | |
1576 | ||
9bf39ab2 | 1577 | /* file_path() fills at the end, move name down */ |
2aa362c4 DV |
1578 | /* n = strlen(filename) + 1: */ |
1579 | n = (name_curpos + remaining) - filename; | |
1580 | remaining = filename - name_curpos; | |
1581 | memmove(name_curpos, filename, n); | |
1582 | name_curpos += n; | |
1583 | ||
1584 | *start_end_ofs++ = vma->vm_start; | |
1585 | *start_end_ofs++ = vma->vm_end; | |
1586 | *start_end_ofs++ = vma->vm_pgoff; | |
1587 | count++; | |
1588 | } | |
1589 | ||
1590 | /* Now we know exact count of files, can store it */ | |
1591 | data[0] = count; | |
1592 | data[1] = PAGE_SIZE; | |
1593 | /* | |
1594 | * Count usually is less than current->mm->map_count, | |
1595 | * we need to move filenames down. | |
1596 | */ | |
1597 | n = current->mm->map_count - count; | |
1598 | if (n != 0) { | |
1599 | unsigned shift_bytes = n * 3 * sizeof(data[0]); | |
1600 | memmove(name_base - shift_bytes, name_base, | |
1601 | name_curpos - name_base); | |
1602 | name_curpos -= shift_bytes; | |
1603 | } | |
1604 | ||
1605 | size = name_curpos - (char *)data; | |
1606 | fill_note(note, "CORE", NT_FILE, size, data); | |
72023656 | 1607 | return 0; |
2aa362c4 DV |
1608 | } |
1609 | ||
4206d3aa RM |
1610 | #ifdef CORE_DUMP_USE_REGSET |
1611 | #include <linux/regset.h> | |
1612 | ||
1613 | struct elf_thread_core_info { | |
1614 | struct elf_thread_core_info *next; | |
1615 | struct task_struct *task; | |
1616 | struct elf_prstatus prstatus; | |
1617 | struct memelfnote notes[0]; | |
1618 | }; | |
1619 | ||
1620 | struct elf_note_info { | |
1621 | struct elf_thread_core_info *thread; | |
1622 | struct memelfnote psinfo; | |
49ae4d4b | 1623 | struct memelfnote signote; |
4206d3aa | 1624 | struct memelfnote auxv; |
2aa362c4 | 1625 | struct memelfnote files; |
49ae4d4b | 1626 | user_siginfo_t csigdata; |
4206d3aa RM |
1627 | size_t size; |
1628 | int thread_notes; | |
1629 | }; | |
1630 | ||
d31472b6 RM |
1631 | /* |
1632 | * When a regset has a writeback hook, we call it on each thread before | |
1633 | * dumping user memory. On register window machines, this makes sure the | |
1634 | * user memory backing the register data is up to date before we read it. | |
1635 | */ | |
1636 | static void do_thread_regset_writeback(struct task_struct *task, | |
1637 | const struct user_regset *regset) | |
1638 | { | |
1639 | if (regset->writeback) | |
1640 | regset->writeback(task, regset, 1); | |
1641 | } | |
1642 | ||
0953f65d | 1643 | #ifndef PRSTATUS_SIZE |
90954e7b | 1644 | #define PRSTATUS_SIZE(S, R) sizeof(S) |
0953f65d L |
1645 | #endif |
1646 | ||
1647 | #ifndef SET_PR_FPVALID | |
90954e7b | 1648 | #define SET_PR_FPVALID(S, V, R) ((S)->pr_fpvalid = (V)) |
0953f65d L |
1649 | #endif |
1650 | ||
4206d3aa RM |
1651 | static int fill_thread_core_info(struct elf_thread_core_info *t, |
1652 | const struct user_regset_view *view, | |
1653 | long signr, size_t *total) | |
1654 | { | |
1655 | unsigned int i; | |
90954e7b | 1656 | unsigned int regset_size = view->regsets[0].n * view->regsets[0].size; |
4206d3aa RM |
1657 | |
1658 | /* | |
1659 | * NT_PRSTATUS is the one special case, because the regset data | |
1660 | * goes into the pr_reg field inside the note contents, rather | |
1661 | * than being the whole note contents. We fill the reset in here. | |
1662 | * We assume that regset 0 is NT_PRSTATUS. | |
1663 | */ | |
1664 | fill_prstatus(&t->prstatus, t->task, signr); | |
90954e7b DS |
1665 | (void) view->regsets[0].get(t->task, &view->regsets[0], 0, regset_size, |
1666 | &t->prstatus.pr_reg, NULL); | |
4206d3aa RM |
1667 | |
1668 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, | |
90954e7b | 1669 | PRSTATUS_SIZE(t->prstatus, regset_size), &t->prstatus); |
4206d3aa RM |
1670 | *total += notesize(&t->notes[0]); |
1671 | ||
d31472b6 RM |
1672 | do_thread_regset_writeback(t->task, &view->regsets[0]); |
1673 | ||
4206d3aa RM |
1674 | /* |
1675 | * Each other regset might generate a note too. For each regset | |
1676 | * that has no core_note_type or is inactive, we leave t->notes[i] | |
1677 | * all zero and we'll know to skip writing it later. | |
1678 | */ | |
1679 | for (i = 1; i < view->n; ++i) { | |
1680 | const struct user_regset *regset = &view->regsets[i]; | |
d31472b6 | 1681 | do_thread_regset_writeback(t->task, regset); |
c8e25258 | 1682 | if (regset->core_note_type && regset->get && |
4206d3aa RM |
1683 | (!regset->active || regset->active(t->task, regset))) { |
1684 | int ret; | |
1685 | size_t size = regset->n * regset->size; | |
1686 | void *data = kmalloc(size, GFP_KERNEL); | |
1687 | if (unlikely(!data)) | |
1688 | return 0; | |
1689 | ret = regset->get(t->task, regset, | |
1690 | 0, size, data, NULL); | |
1691 | if (unlikely(ret)) | |
1692 | kfree(data); | |
1693 | else { | |
1694 | if (regset->core_note_type != NT_PRFPREG) | |
1695 | fill_note(&t->notes[i], "LINUX", | |
1696 | regset->core_note_type, | |
1697 | size, data); | |
1698 | else { | |
90954e7b DS |
1699 | SET_PR_FPVALID(&t->prstatus, |
1700 | 1, regset_size); | |
4206d3aa RM |
1701 | fill_note(&t->notes[i], "CORE", |
1702 | NT_PRFPREG, size, data); | |
1703 | } | |
1704 | *total += notesize(&t->notes[i]); | |
1705 | } | |
1706 | } | |
1707 | } | |
1708 | ||
1709 | return 1; | |
1710 | } | |
1711 | ||
1712 | static int fill_note_info(struct elfhdr *elf, int phdrs, | |
1713 | struct elf_note_info *info, | |
ec57941e | 1714 | const siginfo_t *siginfo, struct pt_regs *regs) |
4206d3aa RM |
1715 | { |
1716 | struct task_struct *dump_task = current; | |
1717 | const struct user_regset_view *view = task_user_regset_view(dump_task); | |
1718 | struct elf_thread_core_info *t; | |
1719 | struct elf_prpsinfo *psinfo; | |
83914441 | 1720 | struct core_thread *ct; |
4206d3aa RM |
1721 | unsigned int i; |
1722 | ||
1723 | info->size = 0; | |
1724 | info->thread = NULL; | |
1725 | ||
1726 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
6899e92d AC |
1727 | if (psinfo == NULL) { |
1728 | info->psinfo.data = NULL; /* So we don't free this wrongly */ | |
4206d3aa | 1729 | return 0; |
6899e92d | 1730 | } |
4206d3aa | 1731 | |
e2dbe125 AW |
1732 | fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
1733 | ||
4206d3aa RM |
1734 | /* |
1735 | * Figure out how many notes we're going to need for each thread. | |
1736 | */ | |
1737 | info->thread_notes = 0; | |
1738 | for (i = 0; i < view->n; ++i) | |
1739 | if (view->regsets[i].core_note_type != 0) | |
1740 | ++info->thread_notes; | |
1741 | ||
1742 | /* | |
1743 | * Sanity check. We rely on regset 0 being in NT_PRSTATUS, | |
1744 | * since it is our one special case. | |
1745 | */ | |
1746 | if (unlikely(info->thread_notes == 0) || | |
1747 | unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) { | |
1748 | WARN_ON(1); | |
1749 | return 0; | |
1750 | } | |
1751 | ||
1752 | /* | |
1753 | * Initialize the ELF file header. | |
1754 | */ | |
1755 | fill_elf_header(elf, phdrs, | |
d3330cf0 | 1756 | view->e_machine, view->e_flags); |
4206d3aa RM |
1757 | |
1758 | /* | |
1759 | * Allocate a structure for each thread. | |
1760 | */ | |
83914441 ON |
1761 | for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) { |
1762 | t = kzalloc(offsetof(struct elf_thread_core_info, | |
1763 | notes[info->thread_notes]), | |
1764 | GFP_KERNEL); | |
1765 | if (unlikely(!t)) | |
1766 | return 0; | |
1767 | ||
1768 | t->task = ct->task; | |
1769 | if (ct->task == dump_task || !info->thread) { | |
1770 | t->next = info->thread; | |
1771 | info->thread = t; | |
1772 | } else { | |
1773 | /* | |
1774 | * Make sure to keep the original task at | |
1775 | * the head of the list. | |
1776 | */ | |
1777 | t->next = info->thread->next; | |
1778 | info->thread->next = t; | |
4206d3aa | 1779 | } |
83914441 | 1780 | } |
4206d3aa RM |
1781 | |
1782 | /* | |
1783 | * Now fill in each thread's information. | |
1784 | */ | |
1785 | for (t = info->thread; t != NULL; t = t->next) | |
5ab1c309 | 1786 | if (!fill_thread_core_info(t, view, siginfo->si_signo, &info->size)) |
4206d3aa RM |
1787 | return 0; |
1788 | ||
1789 | /* | |
1790 | * Fill in the two process-wide notes. | |
1791 | */ | |
1792 | fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm); | |
1793 | info->size += notesize(&info->psinfo); | |
1794 | ||
49ae4d4b DV |
1795 | fill_siginfo_note(&info->signote, &info->csigdata, siginfo); |
1796 | info->size += notesize(&info->signote); | |
1797 | ||
4206d3aa RM |
1798 | fill_auxv_note(&info->auxv, current->mm); |
1799 | info->size += notesize(&info->auxv); | |
1800 | ||
72023656 DA |
1801 | if (fill_files_note(&info->files) == 0) |
1802 | info->size += notesize(&info->files); | |
2aa362c4 | 1803 | |
4206d3aa RM |
1804 | return 1; |
1805 | } | |
1806 | ||
1807 | static size_t get_note_info_size(struct elf_note_info *info) | |
1808 | { | |
1809 | return info->size; | |
1810 | } | |
1811 | ||
1812 | /* | |
1813 | * Write all the notes for each thread. When writing the first thread, the | |
1814 | * process-wide notes are interleaved after the first thread-specific note. | |
1815 | */ | |
1816 | static int write_note_info(struct elf_note_info *info, | |
ecc8c772 | 1817 | struct coredump_params *cprm) |
4206d3aa | 1818 | { |
b219e25f | 1819 | bool first = true; |
4206d3aa RM |
1820 | struct elf_thread_core_info *t = info->thread; |
1821 | ||
1822 | do { | |
1823 | int i; | |
1824 | ||
ecc8c772 | 1825 | if (!writenote(&t->notes[0], cprm)) |
4206d3aa RM |
1826 | return 0; |
1827 | ||
ecc8c772 | 1828 | if (first && !writenote(&info->psinfo, cprm)) |
4206d3aa | 1829 | return 0; |
ecc8c772 | 1830 | if (first && !writenote(&info->signote, cprm)) |
49ae4d4b | 1831 | return 0; |
ecc8c772 | 1832 | if (first && !writenote(&info->auxv, cprm)) |
4206d3aa | 1833 | return 0; |
72023656 | 1834 | if (first && info->files.data && |
ecc8c772 | 1835 | !writenote(&info->files, cprm)) |
2aa362c4 | 1836 | return 0; |
4206d3aa RM |
1837 | |
1838 | for (i = 1; i < info->thread_notes; ++i) | |
1839 | if (t->notes[i].data && | |
ecc8c772 | 1840 | !writenote(&t->notes[i], cprm)) |
4206d3aa RM |
1841 | return 0; |
1842 | ||
b219e25f | 1843 | first = false; |
4206d3aa RM |
1844 | t = t->next; |
1845 | } while (t); | |
1846 | ||
1847 | return 1; | |
1848 | } | |
1849 | ||
1850 | static void free_note_info(struct elf_note_info *info) | |
1851 | { | |
1852 | struct elf_thread_core_info *threads = info->thread; | |
1853 | while (threads) { | |
1854 | unsigned int i; | |
1855 | struct elf_thread_core_info *t = threads; | |
1856 | threads = t->next; | |
1857 | WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus); | |
1858 | for (i = 1; i < info->thread_notes; ++i) | |
1859 | kfree(t->notes[i].data); | |
1860 | kfree(t); | |
1861 | } | |
1862 | kfree(info->psinfo.data); | |
2aa362c4 | 1863 | vfree(info->files.data); |
4206d3aa RM |
1864 | } |
1865 | ||
1866 | #else | |
1867 | ||
1da177e4 LT |
1868 | /* Here is the structure in which status of each thread is captured. */ |
1869 | struct elf_thread_status | |
1870 | { | |
1871 | struct list_head list; | |
1872 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1873 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1874 | struct task_struct *thread; | |
1875 | #ifdef ELF_CORE_COPY_XFPREGS | |
5b20cd80 | 1876 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
1da177e4 LT |
1877 | #endif |
1878 | struct memelfnote notes[3]; | |
1879 | int num_notes; | |
1880 | }; | |
1881 | ||
1882 | /* | |
1883 | * In order to add the specific thread information for the elf file format, | |
f4e5cc2c JJ |
1884 | * we need to keep a linked list of every threads pr_status and then create |
1885 | * a single section for them in the final core file. | |
1da177e4 LT |
1886 | */ |
1887 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1888 | { | |
1889 | int sz = 0; | |
1890 | struct task_struct *p = t->thread; | |
1891 | t->num_notes = 0; | |
1892 | ||
1893 | fill_prstatus(&t->prstatus, p, signr); | |
1894 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1895 | ||
f4e5cc2c JJ |
1896 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
1897 | &(t->prstatus)); | |
1da177e4 LT |
1898 | t->num_notes++; |
1899 | sz += notesize(&t->notes[0]); | |
1900 | ||
f4e5cc2c JJ |
1901 | if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, |
1902 | &t->fpu))) { | |
1903 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1904 | &(t->fpu)); | |
1da177e4 LT |
1905 | t->num_notes++; |
1906 | sz += notesize(&t->notes[1]); | |
1907 | } | |
1908 | ||
1909 | #ifdef ELF_CORE_COPY_XFPREGS | |
1910 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
5b20cd80 MN |
1911 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1912 | sizeof(t->xfpu), &t->xfpu); | |
1da177e4 LT |
1913 | t->num_notes++; |
1914 | sz += notesize(&t->notes[2]); | |
1915 | } | |
1916 | #endif | |
1917 | return sz; | |
1918 | } | |
1919 | ||
3aba481f RM |
1920 | struct elf_note_info { |
1921 | struct memelfnote *notes; | |
72023656 | 1922 | struct memelfnote *notes_files; |
3aba481f RM |
1923 | struct elf_prstatus *prstatus; /* NT_PRSTATUS */ |
1924 | struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */ | |
1925 | struct list_head thread_list; | |
1926 | elf_fpregset_t *fpu; | |
1927 | #ifdef ELF_CORE_COPY_XFPREGS | |
1928 | elf_fpxregset_t *xfpu; | |
1929 | #endif | |
49ae4d4b | 1930 | user_siginfo_t csigdata; |
3aba481f RM |
1931 | int thread_status_size; |
1932 | int numnote; | |
1933 | }; | |
1934 | ||
0cf062d0 | 1935 | static int elf_note_info_init(struct elf_note_info *info) |
3aba481f | 1936 | { |
0cf062d0 | 1937 | memset(info, 0, sizeof(*info)); |
3aba481f RM |
1938 | INIT_LIST_HEAD(&info->thread_list); |
1939 | ||
49ae4d4b | 1940 | /* Allocate space for ELF notes */ |
2aa362c4 | 1941 | info->notes = kmalloc(8 * sizeof(struct memelfnote), GFP_KERNEL); |
3aba481f RM |
1942 | if (!info->notes) |
1943 | return 0; | |
1944 | info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL); | |
1945 | if (!info->psinfo) | |
f34f9d18 | 1946 | return 0; |
3aba481f RM |
1947 | info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL); |
1948 | if (!info->prstatus) | |
f34f9d18 | 1949 | return 0; |
3aba481f RM |
1950 | info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL); |
1951 | if (!info->fpu) | |
f34f9d18 | 1952 | return 0; |
3aba481f RM |
1953 | #ifdef ELF_CORE_COPY_XFPREGS |
1954 | info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL); | |
1955 | if (!info->xfpu) | |
f34f9d18 | 1956 | return 0; |
3aba481f | 1957 | #endif |
0cf062d0 | 1958 | return 1; |
0cf062d0 AW |
1959 | } |
1960 | ||
1961 | static int fill_note_info(struct elfhdr *elf, int phdrs, | |
1962 | struct elf_note_info *info, | |
ec57941e | 1963 | const siginfo_t *siginfo, struct pt_regs *regs) |
0cf062d0 AW |
1964 | { |
1965 | struct list_head *t; | |
afabada9 AV |
1966 | struct core_thread *ct; |
1967 | struct elf_thread_status *ets; | |
0cf062d0 AW |
1968 | |
1969 | if (!elf_note_info_init(info)) | |
1970 | return 0; | |
3aba481f | 1971 | |
afabada9 AV |
1972 | for (ct = current->mm->core_state->dumper.next; |
1973 | ct; ct = ct->next) { | |
1974 | ets = kzalloc(sizeof(*ets), GFP_KERNEL); | |
1975 | if (!ets) | |
1976 | return 0; | |
83914441 | 1977 | |
afabada9 AV |
1978 | ets->thread = ct->task; |
1979 | list_add(&ets->list, &info->thread_list); | |
1980 | } | |
83914441 | 1981 | |
afabada9 AV |
1982 | list_for_each(t, &info->thread_list) { |
1983 | int sz; | |
3aba481f | 1984 | |
afabada9 AV |
1985 | ets = list_entry(t, struct elf_thread_status, list); |
1986 | sz = elf_dump_thread_status(siginfo->si_signo, ets); | |
1987 | info->thread_status_size += sz; | |
3aba481f RM |
1988 | } |
1989 | /* now collect the dump for the current */ | |
1990 | memset(info->prstatus, 0, sizeof(*info->prstatus)); | |
5ab1c309 | 1991 | fill_prstatus(info->prstatus, current, siginfo->si_signo); |
3aba481f RM |
1992 | elf_core_copy_regs(&info->prstatus->pr_reg, regs); |
1993 | ||
1994 | /* Set up header */ | |
d3330cf0 | 1995 | fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS); |
3aba481f RM |
1996 | |
1997 | /* | |
1998 | * Set up the notes in similar form to SVR4 core dumps made | |
1999 | * with info from their /proc. | |
2000 | */ | |
2001 | ||
2002 | fill_note(info->notes + 0, "CORE", NT_PRSTATUS, | |
2003 | sizeof(*info->prstatus), info->prstatus); | |
2004 | fill_psinfo(info->psinfo, current->group_leader, current->mm); | |
2005 | fill_note(info->notes + 1, "CORE", NT_PRPSINFO, | |
2006 | sizeof(*info->psinfo), info->psinfo); | |
2007 | ||
2aa362c4 DV |
2008 | fill_siginfo_note(info->notes + 2, &info->csigdata, siginfo); |
2009 | fill_auxv_note(info->notes + 3, current->mm); | |
72023656 | 2010 | info->numnote = 4; |
3aba481f | 2011 | |
72023656 DA |
2012 | if (fill_files_note(info->notes + info->numnote) == 0) { |
2013 | info->notes_files = info->notes + info->numnote; | |
2014 | info->numnote++; | |
2015 | } | |
3aba481f RM |
2016 | |
2017 | /* Try to dump the FPU. */ | |
2018 | info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs, | |
2019 | info->fpu); | |
2020 | if (info->prstatus->pr_fpvalid) | |
2021 | fill_note(info->notes + info->numnote++, | |
2022 | "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu); | |
2023 | #ifdef ELF_CORE_COPY_XFPREGS | |
2024 | if (elf_core_copy_task_xfpregs(current, info->xfpu)) | |
2025 | fill_note(info->notes + info->numnote++, | |
2026 | "LINUX", ELF_CORE_XFPREG_TYPE, | |
2027 | sizeof(*info->xfpu), info->xfpu); | |
2028 | #endif | |
2029 | ||
2030 | return 1; | |
3aba481f RM |
2031 | } |
2032 | ||
2033 | static size_t get_note_info_size(struct elf_note_info *info) | |
2034 | { | |
2035 | int sz = 0; | |
2036 | int i; | |
2037 | ||
2038 | for (i = 0; i < info->numnote; i++) | |
2039 | sz += notesize(info->notes + i); | |
2040 | ||
2041 | sz += info->thread_status_size; | |
2042 | ||
2043 | return sz; | |
2044 | } | |
2045 | ||
2046 | static int write_note_info(struct elf_note_info *info, | |
ecc8c772 | 2047 | struct coredump_params *cprm) |
3aba481f RM |
2048 | { |
2049 | int i; | |
2050 | struct list_head *t; | |
2051 | ||
2052 | for (i = 0; i < info->numnote; i++) | |
ecc8c772 | 2053 | if (!writenote(info->notes + i, cprm)) |
3aba481f RM |
2054 | return 0; |
2055 | ||
2056 | /* write out the thread status notes section */ | |
2057 | list_for_each(t, &info->thread_list) { | |
2058 | struct elf_thread_status *tmp = | |
2059 | list_entry(t, struct elf_thread_status, list); | |
2060 | ||
2061 | for (i = 0; i < tmp->num_notes; i++) | |
ecc8c772 | 2062 | if (!writenote(&tmp->notes[i], cprm)) |
3aba481f RM |
2063 | return 0; |
2064 | } | |
2065 | ||
2066 | return 1; | |
2067 | } | |
2068 | ||
2069 | static void free_note_info(struct elf_note_info *info) | |
2070 | { | |
2071 | while (!list_empty(&info->thread_list)) { | |
2072 | struct list_head *tmp = info->thread_list.next; | |
2073 | list_del(tmp); | |
2074 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
2075 | } | |
2076 | ||
72023656 DA |
2077 | /* Free data possibly allocated by fill_files_note(): */ |
2078 | if (info->notes_files) | |
2079 | vfree(info->notes_files->data); | |
2aa362c4 | 2080 | |
3aba481f RM |
2081 | kfree(info->prstatus); |
2082 | kfree(info->psinfo); | |
2083 | kfree(info->notes); | |
2084 | kfree(info->fpu); | |
2085 | #ifdef ELF_CORE_COPY_XFPREGS | |
2086 | kfree(info->xfpu); | |
2087 | #endif | |
2088 | } | |
2089 | ||
4206d3aa RM |
2090 | #endif |
2091 | ||
f47aef55 RM |
2092 | static struct vm_area_struct *first_vma(struct task_struct *tsk, |
2093 | struct vm_area_struct *gate_vma) | |
2094 | { | |
2095 | struct vm_area_struct *ret = tsk->mm->mmap; | |
2096 | ||
2097 | if (ret) | |
2098 | return ret; | |
2099 | return gate_vma; | |
2100 | } | |
2101 | /* | |
2102 | * Helper function for iterating across a vma list. It ensures that the caller | |
2103 | * will visit `gate_vma' prior to terminating the search. | |
2104 | */ | |
2105 | static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma, | |
2106 | struct vm_area_struct *gate_vma) | |
2107 | { | |
2108 | struct vm_area_struct *ret; | |
2109 | ||
2110 | ret = this_vma->vm_next; | |
2111 | if (ret) | |
2112 | return ret; | |
2113 | if (this_vma == gate_vma) | |
2114 | return NULL; | |
2115 | return gate_vma; | |
2116 | } | |
2117 | ||
8d9032bb DH |
2118 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
2119 | elf_addr_t e_shoff, int segs) | |
2120 | { | |
2121 | elf->e_shoff = e_shoff; | |
2122 | elf->e_shentsize = sizeof(*shdr4extnum); | |
2123 | elf->e_shnum = 1; | |
2124 | elf->e_shstrndx = SHN_UNDEF; | |
2125 | ||
2126 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); | |
2127 | ||
2128 | shdr4extnum->sh_type = SHT_NULL; | |
2129 | shdr4extnum->sh_size = elf->e_shnum; | |
2130 | shdr4extnum->sh_link = elf->e_shstrndx; | |
2131 | shdr4extnum->sh_info = segs; | |
2132 | } | |
2133 | ||
1da177e4 LT |
2134 | /* |
2135 | * Actual dumper | |
2136 | * | |
2137 | * This is a two-pass process; first we find the offsets of the bits, | |
2138 | * and then they are actually written out. If we run out of core limit | |
2139 | * we just truncate. | |
2140 | */ | |
f6151dfe | 2141 | static int elf_core_dump(struct coredump_params *cprm) |
1da177e4 | 2142 | { |
1da177e4 LT |
2143 | int has_dumped = 0; |
2144 | mm_segment_t fs; | |
52f5592e JL |
2145 | int segs, i; |
2146 | size_t vma_data_size = 0; | |
f47aef55 | 2147 | struct vm_area_struct *vma, *gate_vma; |
1da177e4 | 2148 | struct elfhdr *elf = NULL; |
cdc3d562 | 2149 | loff_t offset = 0, dataoff; |
72023656 | 2150 | struct elf_note_info info = { }; |
93eb211e | 2151 | struct elf_phdr *phdr4note = NULL; |
8d9032bb DH |
2152 | struct elf_shdr *shdr4extnum = NULL; |
2153 | Elf_Half e_phnum; | |
2154 | elf_addr_t e_shoff; | |
52f5592e | 2155 | elf_addr_t *vma_filesz = NULL; |
1da177e4 LT |
2156 | |
2157 | /* | |
2158 | * We no longer stop all VM operations. | |
2159 | * | |
f4e5cc2c JJ |
2160 | * This is because those proceses that could possibly change map_count |
2161 | * or the mmap / vma pages are now blocked in do_exit on current | |
2162 | * finishing this core dump. | |
1da177e4 LT |
2163 | * |
2164 | * Only ptrace can touch these memory addresses, but it doesn't change | |
f4e5cc2c | 2165 | * the map_count or the pages allocated. So no possibility of crashing |
1da177e4 LT |
2166 | * exists while dumping the mm->vm_next areas to the core file. |
2167 | */ | |
2168 | ||
2169 | /* alloc memory for large data structures: too large to be on stack */ | |
2170 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
2171 | if (!elf) | |
5f719558 | 2172 | goto out; |
341c87bf KH |
2173 | /* |
2174 | * The number of segs are recored into ELF header as 16bit value. | |
2175 | * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here. | |
2176 | */ | |
1da177e4 | 2177 | segs = current->mm->map_count; |
1fcccbac | 2178 | segs += elf_core_extra_phdrs(); |
1da177e4 | 2179 | |
31db58b3 | 2180 | gate_vma = get_gate_vma(current->mm); |
f47aef55 RM |
2181 | if (gate_vma != NULL) |
2182 | segs++; | |
2183 | ||
8d9032bb DH |
2184 | /* for notes section */ |
2185 | segs++; | |
2186 | ||
2187 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid | |
2188 | * this, kernel supports extended numbering. Have a look at | |
2189 | * include/linux/elf.h for further information. */ | |
2190 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; | |
2191 | ||
1da177e4 | 2192 | /* |
3aba481f RM |
2193 | * Collect all the non-memory information about the process for the |
2194 | * notes. This also sets up the file header. | |
1da177e4 | 2195 | */ |
5ab1c309 | 2196 | if (!fill_note_info(elf, e_phnum, &info, cprm->siginfo, cprm->regs)) |
3aba481f | 2197 | goto cleanup; |
1da177e4 | 2198 | |
3aba481f | 2199 | has_dumped = 1; |
079148b9 | 2200 | |
1da177e4 LT |
2201 | fs = get_fs(); |
2202 | set_fs(KERNEL_DS); | |
2203 | ||
1da177e4 | 2204 | offset += sizeof(*elf); /* Elf header */ |
8d9032bb | 2205 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
1da177e4 LT |
2206 | |
2207 | /* Write notes phdr entry */ | |
2208 | { | |
3aba481f | 2209 | size_t sz = get_note_info_size(&info); |
1da177e4 | 2210 | |
e5501492 | 2211 | sz += elf_coredump_extra_notes_size(); |
bf1ab978 | 2212 | |
93eb211e DH |
2213 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
2214 | if (!phdr4note) | |
088e7af7 | 2215 | goto end_coredump; |
93eb211e DH |
2216 | |
2217 | fill_elf_note_phdr(phdr4note, sz, offset); | |
2218 | offset += sz; | |
1da177e4 LT |
2219 | } |
2220 | ||
1da177e4 LT |
2221 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
2222 | ||
30f74aa0 JB |
2223 | if (segs - 1 > ULONG_MAX / sizeof(*vma_filesz)) |
2224 | goto end_coredump; | |
2225 | vma_filesz = vmalloc((segs - 1) * sizeof(*vma_filesz)); | |
52f5592e JL |
2226 | if (!vma_filesz) |
2227 | goto end_coredump; | |
2228 | ||
2229 | for (i = 0, vma = first_vma(current, gate_vma); vma != NULL; | |
2230 | vma = next_vma(vma, gate_vma)) { | |
2231 | unsigned long dump_size; | |
2232 | ||
2233 | dump_size = vma_dump_size(vma, cprm->mm_flags); | |
2234 | vma_filesz[i++] = dump_size; | |
2235 | vma_data_size += dump_size; | |
2236 | } | |
2237 | ||
2238 | offset += vma_data_size; | |
8d9032bb DH |
2239 | offset += elf_core_extra_data_size(); |
2240 | e_shoff = offset; | |
2241 | ||
2242 | if (e_phnum == PN_XNUM) { | |
2243 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); | |
2244 | if (!shdr4extnum) | |
2245 | goto end_coredump; | |
2246 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs); | |
2247 | } | |
2248 | ||
2249 | offset = dataoff; | |
2250 | ||
ecc8c772 | 2251 | if (!dump_emit(cprm, elf, sizeof(*elf))) |
93eb211e DH |
2252 | goto end_coredump; |
2253 | ||
ecc8c772 | 2254 | if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) |
93eb211e DH |
2255 | goto end_coredump; |
2256 | ||
1da177e4 | 2257 | /* Write program headers for segments dump */ |
52f5592e | 2258 | for (i = 0, vma = first_vma(current, gate_vma); vma != NULL; |
f47aef55 | 2259 | vma = next_vma(vma, gate_vma)) { |
1da177e4 | 2260 | struct elf_phdr phdr; |
1da177e4 LT |
2261 | |
2262 | phdr.p_type = PT_LOAD; | |
2263 | phdr.p_offset = offset; | |
2264 | phdr.p_vaddr = vma->vm_start; | |
2265 | phdr.p_paddr = 0; | |
52f5592e | 2266 | phdr.p_filesz = vma_filesz[i++]; |
82df3973 | 2267 | phdr.p_memsz = vma->vm_end - vma->vm_start; |
1da177e4 LT |
2268 | offset += phdr.p_filesz; |
2269 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
f4e5cc2c JJ |
2270 | if (vma->vm_flags & VM_WRITE) |
2271 | phdr.p_flags |= PF_W; | |
2272 | if (vma->vm_flags & VM_EXEC) | |
2273 | phdr.p_flags |= PF_X; | |
1da177e4 LT |
2274 | phdr.p_align = ELF_EXEC_PAGESIZE; |
2275 | ||
ecc8c772 | 2276 | if (!dump_emit(cprm, &phdr, sizeof(phdr))) |
088e7af7 | 2277 | goto end_coredump; |
1da177e4 LT |
2278 | } |
2279 | ||
506f21c5 | 2280 | if (!elf_core_write_extra_phdrs(cprm, offset)) |
1fcccbac | 2281 | goto end_coredump; |
1da177e4 LT |
2282 | |
2283 | /* write out the notes section */ | |
ecc8c772 | 2284 | if (!write_note_info(&info, cprm)) |
3aba481f | 2285 | goto end_coredump; |
1da177e4 | 2286 | |
cdc3d562 | 2287 | if (elf_coredump_extra_notes_write(cprm)) |
e5501492 | 2288 | goto end_coredump; |
bf1ab978 | 2289 | |
d025c9db | 2290 | /* Align to page */ |
1607f09c | 2291 | if (!dump_skip(cprm, dataoff - cprm->pos)) |
f3e8fccd | 2292 | goto end_coredump; |
1da177e4 | 2293 | |
52f5592e | 2294 | for (i = 0, vma = first_vma(current, gate_vma); vma != NULL; |
f47aef55 | 2295 | vma = next_vma(vma, gate_vma)) { |
1da177e4 | 2296 | unsigned long addr; |
82df3973 | 2297 | unsigned long end; |
1da177e4 | 2298 | |
52f5592e | 2299 | end = vma->vm_start + vma_filesz[i++]; |
1da177e4 | 2300 | |
82df3973 | 2301 | for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) { |
f4e5cc2c | 2302 | struct page *page; |
f3e8fccd HD |
2303 | int stop; |
2304 | ||
2305 | page = get_dump_page(addr); | |
2306 | if (page) { | |
2307 | void *kaddr = kmap(page); | |
13046ece | 2308 | stop = !dump_emit(cprm, kaddr, PAGE_SIZE); |
f3e8fccd | 2309 | kunmap(page); |
09cbfeaf | 2310 | put_page(page); |
f3e8fccd | 2311 | } else |
9b56d543 | 2312 | stop = !dump_skip(cprm, PAGE_SIZE); |
f3e8fccd HD |
2313 | if (stop) |
2314 | goto end_coredump; | |
1da177e4 LT |
2315 | } |
2316 | } | |
4d22c75d | 2317 | dump_truncate(cprm); |
1da177e4 | 2318 | |
aa3e7eaf | 2319 | if (!elf_core_write_extra_data(cprm)) |
1fcccbac | 2320 | goto end_coredump; |
1da177e4 | 2321 | |
8d9032bb | 2322 | if (e_phnum == PN_XNUM) { |
13046ece | 2323 | if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) |
8d9032bb DH |
2324 | goto end_coredump; |
2325 | } | |
2326 | ||
1da177e4 LT |
2327 | end_coredump: |
2328 | set_fs(fs); | |
2329 | ||
2330 | cleanup: | |
3aba481f | 2331 | free_note_info(&info); |
8d9032bb | 2332 | kfree(shdr4extnum); |
30f74aa0 | 2333 | vfree(vma_filesz); |
93eb211e | 2334 | kfree(phdr4note); |
5f719558 WC |
2335 | kfree(elf); |
2336 | out: | |
1da177e4 | 2337 | return has_dumped; |
1da177e4 LT |
2338 | } |
2339 | ||
698ba7b5 | 2340 | #endif /* CONFIG_ELF_CORE */ |
1da177e4 LT |
2341 | |
2342 | static int __init init_elf_binfmt(void) | |
2343 | { | |
8fc3dc5a AV |
2344 | register_binfmt(&elf_format); |
2345 | return 0; | |
1da177e4 LT |
2346 | } |
2347 | ||
2348 | static void __exit exit_elf_binfmt(void) | |
2349 | { | |
2350 | /* Remove the COFF and ELF loaders. */ | |
2351 | unregister_binfmt(&elf_format); | |
2352 | } | |
2353 | ||
2354 | core_initcall(init_elf_binfmt); | |
2355 | module_exit(exit_elf_binfmt); | |
2356 | MODULE_LICENSE("GPL"); |