Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/binfmt_elf.c | |
3 | * | |
4 | * These are the functions used to load ELF format executables as used | |
5 | * on SVr4 machines. Information on the format may be found in the book | |
6 | * "UNIX SYSTEM V RELEASE 4 Programmers Guide: Ansi C and Programming Support | |
7 | * Tools". | |
8 | * | |
9 | * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com). | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/fs.h> | |
1da177e4 LT |
15 | #include <linux/mm.h> |
16 | #include <linux/mman.h> | |
1da177e4 LT |
17 | #include <linux/errno.h> |
18 | #include <linux/signal.h> | |
19 | #include <linux/binfmts.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/file.h> | |
1da177e4 | 22 | #include <linux/slab.h> |
1da177e4 LT |
23 | #include <linux/personality.h> |
24 | #include <linux/elfcore.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/highuid.h> | |
1da177e4 LT |
27 | #include <linux/compiler.h> |
28 | #include <linux/highmem.h> | |
29 | #include <linux/pagemap.h> | |
2aa362c4 | 30 | #include <linux/vmalloc.h> |
1da177e4 | 31 | #include <linux/security.h> |
1da177e4 | 32 | #include <linux/random.h> |
f4e5cc2c | 33 | #include <linux/elf.h> |
7e80d0d0 | 34 | #include <linux/utsname.h> |
088e7af7 | 35 | #include <linux/coredump.h> |
6fac4829 | 36 | #include <linux/sched.h> |
1da177e4 LT |
37 | #include <asm/uaccess.h> |
38 | #include <asm/param.h> | |
39 | #include <asm/page.h> | |
40 | ||
2aa362c4 DV |
41 | #ifndef user_long_t |
42 | #define user_long_t long | |
43 | #endif | |
49ae4d4b DV |
44 | #ifndef user_siginfo_t |
45 | #define user_siginfo_t siginfo_t | |
46 | #endif | |
47 | ||
71613c3b | 48 | static int load_elf_binary(struct linux_binprm *bprm); |
bb1ad820 AM |
49 | static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *, |
50 | int, int, unsigned long); | |
1da177e4 | 51 | |
69369a70 JT |
52 | #ifdef CONFIG_USELIB |
53 | static int load_elf_library(struct file *); | |
54 | #else | |
55 | #define load_elf_library NULL | |
56 | #endif | |
57 | ||
1da177e4 LT |
58 | /* |
59 | * If we don't support core dumping, then supply a NULL so we | |
60 | * don't even try. | |
61 | */ | |
698ba7b5 | 62 | #ifdef CONFIG_ELF_CORE |
f6151dfe | 63 | static int elf_core_dump(struct coredump_params *cprm); |
1da177e4 LT |
64 | #else |
65 | #define elf_core_dump NULL | |
66 | #endif | |
67 | ||
68 | #if ELF_EXEC_PAGESIZE > PAGE_SIZE | |
f4e5cc2c | 69 | #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE |
1da177e4 | 70 | #else |
f4e5cc2c | 71 | #define ELF_MIN_ALIGN PAGE_SIZE |
1da177e4 LT |
72 | #endif |
73 | ||
74 | #ifndef ELF_CORE_EFLAGS | |
75 | #define ELF_CORE_EFLAGS 0 | |
76 | #endif | |
77 | ||
78 | #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1)) | |
79 | #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1)) | |
80 | #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1)) | |
81 | ||
82 | static struct linux_binfmt elf_format = { | |
f670d0ec MP |
83 | .module = THIS_MODULE, |
84 | .load_binary = load_elf_binary, | |
85 | .load_shlib = load_elf_library, | |
86 | .core_dump = elf_core_dump, | |
87 | .min_coredump = ELF_EXEC_PAGESIZE, | |
1da177e4 LT |
88 | }; |
89 | ||
d4e3cc38 | 90 | #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE) |
1da177e4 LT |
91 | |
92 | static int set_brk(unsigned long start, unsigned long end) | |
93 | { | |
94 | start = ELF_PAGEALIGN(start); | |
95 | end = ELF_PAGEALIGN(end); | |
96 | if (end > start) { | |
97 | unsigned long addr; | |
e4eb1ff6 | 98 | addr = vm_brk(start, end - start); |
1da177e4 LT |
99 | if (BAD_ADDR(addr)) |
100 | return addr; | |
101 | } | |
102 | current->mm->start_brk = current->mm->brk = end; | |
103 | return 0; | |
104 | } | |
105 | ||
1da177e4 LT |
106 | /* We need to explicitly zero any fractional pages |
107 | after the data section (i.e. bss). This would | |
108 | contain the junk from the file that should not | |
f4e5cc2c JJ |
109 | be in memory |
110 | */ | |
1da177e4 LT |
111 | static int padzero(unsigned long elf_bss) |
112 | { | |
113 | unsigned long nbyte; | |
114 | ||
115 | nbyte = ELF_PAGEOFFSET(elf_bss); | |
116 | if (nbyte) { | |
117 | nbyte = ELF_MIN_ALIGN - nbyte; | |
118 | if (clear_user((void __user *) elf_bss, nbyte)) | |
119 | return -EFAULT; | |
120 | } | |
121 | return 0; | |
122 | } | |
123 | ||
09c6dd3c | 124 | /* Let's use some macros to make this stack manipulation a little clearer */ |
1da177e4 LT |
125 | #ifdef CONFIG_STACK_GROWSUP |
126 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items)) | |
127 | #define STACK_ROUND(sp, items) \ | |
128 | ((15 + (unsigned long) ((sp) + (items))) &~ 15UL) | |
f4e5cc2c JJ |
129 | #define STACK_ALLOC(sp, len) ({ \ |
130 | elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \ | |
131 | old_sp; }) | |
1da177e4 LT |
132 | #else |
133 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items)) | |
134 | #define STACK_ROUND(sp, items) \ | |
135 | (((unsigned long) (sp - items)) &~ 15UL) | |
136 | #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; }) | |
137 | #endif | |
138 | ||
483fad1c NL |
139 | #ifndef ELF_BASE_PLATFORM |
140 | /* | |
141 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. | |
142 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value | |
143 | * will be copied to the user stack in the same manner as AT_PLATFORM. | |
144 | */ | |
145 | #define ELF_BASE_PLATFORM NULL | |
146 | #endif | |
147 | ||
1da177e4 | 148 | static int |
f4e5cc2c | 149 | create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec, |
d20894a2 | 150 | unsigned long load_addr, unsigned long interp_load_addr) |
1da177e4 LT |
151 | { |
152 | unsigned long p = bprm->p; | |
153 | int argc = bprm->argc; | |
154 | int envc = bprm->envc; | |
155 | elf_addr_t __user *argv; | |
156 | elf_addr_t __user *envp; | |
157 | elf_addr_t __user *sp; | |
158 | elf_addr_t __user *u_platform; | |
483fad1c | 159 | elf_addr_t __user *u_base_platform; |
f06295b4 | 160 | elf_addr_t __user *u_rand_bytes; |
1da177e4 | 161 | const char *k_platform = ELF_PLATFORM; |
483fad1c | 162 | const char *k_base_platform = ELF_BASE_PLATFORM; |
f06295b4 | 163 | unsigned char k_rand_bytes[16]; |
1da177e4 LT |
164 | int items; |
165 | elf_addr_t *elf_info; | |
166 | int ei_index = 0; | |
86a264ab | 167 | const struct cred *cred = current_cred(); |
b6a2fea3 | 168 | struct vm_area_struct *vma; |
1da177e4 | 169 | |
d68c9d6a FBH |
170 | /* |
171 | * In some cases (e.g. Hyper-Threading), we want to avoid L1 | |
172 | * evictions by the processes running on the same package. One | |
173 | * thing we can do is to shuffle the initial stack for them. | |
174 | */ | |
175 | ||
176 | p = arch_align_stack(p); | |
177 | ||
1da177e4 LT |
178 | /* |
179 | * If this architecture has a platform capability string, copy it | |
180 | * to userspace. In some cases (Sparc), this info is impossible | |
181 | * for userspace to get any other way, in others (i386) it is | |
182 | * merely difficult. | |
183 | */ | |
1da177e4 LT |
184 | u_platform = NULL; |
185 | if (k_platform) { | |
186 | size_t len = strlen(k_platform) + 1; | |
187 | ||
1da177e4 LT |
188 | u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); |
189 | if (__copy_to_user(u_platform, k_platform, len)) | |
190 | return -EFAULT; | |
191 | } | |
192 | ||
483fad1c NL |
193 | /* |
194 | * If this architecture has a "base" platform capability | |
195 | * string, copy it to userspace. | |
196 | */ | |
197 | u_base_platform = NULL; | |
198 | if (k_base_platform) { | |
199 | size_t len = strlen(k_base_platform) + 1; | |
200 | ||
201 | u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); | |
202 | if (__copy_to_user(u_base_platform, k_base_platform, len)) | |
203 | return -EFAULT; | |
204 | } | |
205 | ||
f06295b4 KC |
206 | /* |
207 | * Generate 16 random bytes for userspace PRNG seeding. | |
208 | */ | |
209 | get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes)); | |
210 | u_rand_bytes = (elf_addr_t __user *) | |
211 | STACK_ALLOC(p, sizeof(k_rand_bytes)); | |
212 | if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes))) | |
213 | return -EFAULT; | |
214 | ||
1da177e4 | 215 | /* Create the ELF interpreter info */ |
785d5570 | 216 | elf_info = (elf_addr_t *)current->mm->saved_auxv; |
4f9a58d7 | 217 | /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */ |
1da177e4 | 218 | #define NEW_AUX_ENT(id, val) \ |
f4e5cc2c | 219 | do { \ |
785d5570 JJ |
220 | elf_info[ei_index++] = id; \ |
221 | elf_info[ei_index++] = val; \ | |
f4e5cc2c | 222 | } while (0) |
1da177e4 LT |
223 | |
224 | #ifdef ARCH_DLINFO | |
225 | /* | |
226 | * ARCH_DLINFO must come first so PPC can do its special alignment of | |
227 | * AUXV. | |
4f9a58d7 OH |
228 | * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in |
229 | * ARCH_DLINFO changes | |
1da177e4 LT |
230 | */ |
231 | ARCH_DLINFO; | |
232 | #endif | |
233 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); | |
234 | NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE); | |
235 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
236 | NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff); | |
f4e5cc2c | 237 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
1da177e4 LT |
238 | NEW_AUX_ENT(AT_PHNUM, exec->e_phnum); |
239 | NEW_AUX_ENT(AT_BASE, interp_load_addr); | |
240 | NEW_AUX_ENT(AT_FLAGS, 0); | |
241 | NEW_AUX_ENT(AT_ENTRY, exec->e_entry); | |
ebc887b2 EB |
242 | NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid)); |
243 | NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid)); | |
244 | NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid)); | |
245 | NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid)); | |
785d5570 | 246 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
f06295b4 | 247 | NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes); |
2171364d MN |
248 | #ifdef ELF_HWCAP2 |
249 | NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2); | |
250 | #endif | |
65191087 | 251 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
1da177e4 | 252 | if (k_platform) { |
f4e5cc2c | 253 | NEW_AUX_ENT(AT_PLATFORM, |
785d5570 | 254 | (elf_addr_t)(unsigned long)u_platform); |
1da177e4 | 255 | } |
483fad1c NL |
256 | if (k_base_platform) { |
257 | NEW_AUX_ENT(AT_BASE_PLATFORM, | |
258 | (elf_addr_t)(unsigned long)u_base_platform); | |
259 | } | |
1da177e4 | 260 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
785d5570 | 261 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); |
1da177e4 LT |
262 | } |
263 | #undef NEW_AUX_ENT | |
264 | /* AT_NULL is zero; clear the rest too */ | |
265 | memset(&elf_info[ei_index], 0, | |
266 | sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]); | |
267 | ||
268 | /* And advance past the AT_NULL entry. */ | |
269 | ei_index += 2; | |
270 | ||
271 | sp = STACK_ADD(p, ei_index); | |
272 | ||
d20894a2 | 273 | items = (argc + 1) + (envc + 1) + 1; |
1da177e4 LT |
274 | bprm->p = STACK_ROUND(sp, items); |
275 | ||
276 | /* Point sp at the lowest address on the stack */ | |
277 | #ifdef CONFIG_STACK_GROWSUP | |
278 | sp = (elf_addr_t __user *)bprm->p - items - ei_index; | |
f4e5cc2c | 279 | bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */ |
1da177e4 LT |
280 | #else |
281 | sp = (elf_addr_t __user *)bprm->p; | |
282 | #endif | |
283 | ||
b6a2fea3 OW |
284 | |
285 | /* | |
286 | * Grow the stack manually; some architectures have a limit on how | |
287 | * far ahead a user-space access may be in order to grow the stack. | |
288 | */ | |
289 | vma = find_extend_vma(current->mm, bprm->p); | |
290 | if (!vma) | |
291 | return -EFAULT; | |
292 | ||
1da177e4 LT |
293 | /* Now, let's put argc (and argv, envp if appropriate) on the stack */ |
294 | if (__put_user(argc, sp++)) | |
295 | return -EFAULT; | |
d20894a2 AK |
296 | argv = sp; |
297 | envp = argv + argc + 1; | |
1da177e4 LT |
298 | |
299 | /* Populate argv and envp */ | |
a84a5059 | 300 | p = current->mm->arg_end = current->mm->arg_start; |
1da177e4 LT |
301 | while (argc-- > 0) { |
302 | size_t len; | |
841d5fb7 HC |
303 | if (__put_user((elf_addr_t)p, argv++)) |
304 | return -EFAULT; | |
b6a2fea3 OW |
305 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
306 | if (!len || len > MAX_ARG_STRLEN) | |
23c4971e | 307 | return -EINVAL; |
1da177e4 LT |
308 | p += len; |
309 | } | |
310 | if (__put_user(0, argv)) | |
311 | return -EFAULT; | |
312 | current->mm->arg_end = current->mm->env_start = p; | |
313 | while (envc-- > 0) { | |
314 | size_t len; | |
841d5fb7 HC |
315 | if (__put_user((elf_addr_t)p, envp++)) |
316 | return -EFAULT; | |
b6a2fea3 OW |
317 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
318 | if (!len || len > MAX_ARG_STRLEN) | |
23c4971e | 319 | return -EINVAL; |
1da177e4 LT |
320 | p += len; |
321 | } | |
322 | if (__put_user(0, envp)) | |
323 | return -EFAULT; | |
324 | current->mm->env_end = p; | |
325 | ||
326 | /* Put the elf_info on the stack in the right place. */ | |
327 | sp = (elf_addr_t __user *)envp + 1; | |
328 | if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t))) | |
329 | return -EFAULT; | |
330 | return 0; | |
331 | } | |
332 | ||
c07380be JH |
333 | #ifndef elf_map |
334 | ||
1da177e4 | 335 | static unsigned long elf_map(struct file *filep, unsigned long addr, |
cc503c1b JK |
336 | struct elf_phdr *eppnt, int prot, int type, |
337 | unsigned long total_size) | |
1da177e4 LT |
338 | { |
339 | unsigned long map_addr; | |
cc503c1b JK |
340 | unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr); |
341 | unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr); | |
342 | addr = ELF_PAGESTART(addr); | |
343 | size = ELF_PAGEALIGN(size); | |
1da177e4 | 344 | |
dda6ebde DG |
345 | /* mmap() will return -EINVAL if given a zero size, but a |
346 | * segment with zero filesize is perfectly valid */ | |
cc503c1b JK |
347 | if (!size) |
348 | return addr; | |
349 | ||
cc503c1b JK |
350 | /* |
351 | * total_size is the size of the ELF (interpreter) image. | |
352 | * The _first_ mmap needs to know the full size, otherwise | |
353 | * randomization might put this image into an overlapping | |
354 | * position with the ELF binary image. (since size < total_size) | |
355 | * So we first map the 'big' image - and unmap the remainder at | |
356 | * the end. (which unmap is needed for ELF images with holes.) | |
357 | */ | |
358 | if (total_size) { | |
359 | total_size = ELF_PAGEALIGN(total_size); | |
5a5e4c2e | 360 | map_addr = vm_mmap(filep, addr, total_size, prot, type, off); |
cc503c1b | 361 | if (!BAD_ADDR(map_addr)) |
5a5e4c2e | 362 | vm_munmap(map_addr+size, total_size-size); |
cc503c1b | 363 | } else |
5a5e4c2e | 364 | map_addr = vm_mmap(filep, addr, size, prot, type, off); |
cc503c1b | 365 | |
1da177e4 LT |
366 | return(map_addr); |
367 | } | |
368 | ||
c07380be JH |
369 | #endif /* !elf_map */ |
370 | ||
cc503c1b JK |
371 | static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr) |
372 | { | |
373 | int i, first_idx = -1, last_idx = -1; | |
374 | ||
375 | for (i = 0; i < nr; i++) { | |
376 | if (cmds[i].p_type == PT_LOAD) { | |
377 | last_idx = i; | |
378 | if (first_idx == -1) | |
379 | first_idx = i; | |
380 | } | |
381 | } | |
382 | if (first_idx == -1) | |
383 | return 0; | |
384 | ||
385 | return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz - | |
386 | ELF_PAGESTART(cmds[first_idx].p_vaddr); | |
387 | } | |
388 | ||
389 | ||
1da177e4 LT |
390 | /* This is much more generalized than the library routine read function, |
391 | so we keep this separate. Technically the library read function | |
392 | is only provided so that we can read a.out libraries that have | |
393 | an ELF header */ | |
394 | ||
f4e5cc2c | 395 | static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex, |
cc503c1b JK |
396 | struct file *interpreter, unsigned long *interp_map_addr, |
397 | unsigned long no_base) | |
1da177e4 LT |
398 | { |
399 | struct elf_phdr *elf_phdata; | |
400 | struct elf_phdr *eppnt; | |
401 | unsigned long load_addr = 0; | |
402 | int load_addr_set = 0; | |
403 | unsigned long last_bss = 0, elf_bss = 0; | |
404 | unsigned long error = ~0UL; | |
cc503c1b | 405 | unsigned long total_size; |
1da177e4 LT |
406 | int retval, i, size; |
407 | ||
408 | /* First of all, some simple consistency checks */ | |
409 | if (interp_elf_ex->e_type != ET_EXEC && | |
410 | interp_elf_ex->e_type != ET_DYN) | |
411 | goto out; | |
412 | if (!elf_check_arch(interp_elf_ex)) | |
413 | goto out; | |
72c2d531 | 414 | if (!interpreter->f_op->mmap) |
1da177e4 LT |
415 | goto out; |
416 | ||
417 | /* | |
418 | * If the size of this structure has changed, then punt, since | |
419 | * we will be doing the wrong thing. | |
420 | */ | |
421 | if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) | |
422 | goto out; | |
423 | if (interp_elf_ex->e_phnum < 1 || | |
424 | interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr)) | |
425 | goto out; | |
426 | ||
427 | /* Now read in all of the header information */ | |
1da177e4 LT |
428 | size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum; |
429 | if (size > ELF_MIN_ALIGN) | |
430 | goto out; | |
f4e5cc2c | 431 | elf_phdata = kmalloc(size, GFP_KERNEL); |
1da177e4 LT |
432 | if (!elf_phdata) |
433 | goto out; | |
434 | ||
f4e5cc2c | 435 | retval = kernel_read(interpreter, interp_elf_ex->e_phoff, |
f670d0ec | 436 | (char *)elf_phdata, size); |
1da177e4 LT |
437 | error = -EIO; |
438 | if (retval != size) { | |
439 | if (retval < 0) | |
440 | error = retval; | |
441 | goto out_close; | |
442 | } | |
443 | ||
cc503c1b JK |
444 | total_size = total_mapping_size(elf_phdata, interp_elf_ex->e_phnum); |
445 | if (!total_size) { | |
446 | error = -EINVAL; | |
447 | goto out_close; | |
448 | } | |
449 | ||
1da177e4 | 450 | eppnt = elf_phdata; |
f4e5cc2c JJ |
451 | for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) { |
452 | if (eppnt->p_type == PT_LOAD) { | |
453 | int elf_type = MAP_PRIVATE | MAP_DENYWRITE; | |
454 | int elf_prot = 0; | |
455 | unsigned long vaddr = 0; | |
456 | unsigned long k, map_addr; | |
457 | ||
458 | if (eppnt->p_flags & PF_R) | |
459 | elf_prot = PROT_READ; | |
460 | if (eppnt->p_flags & PF_W) | |
461 | elf_prot |= PROT_WRITE; | |
462 | if (eppnt->p_flags & PF_X) | |
463 | elf_prot |= PROT_EXEC; | |
464 | vaddr = eppnt->p_vaddr; | |
465 | if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) | |
466 | elf_type |= MAP_FIXED; | |
cc503c1b JK |
467 | else if (no_base && interp_elf_ex->e_type == ET_DYN) |
468 | load_addr = -vaddr; | |
f4e5cc2c JJ |
469 | |
470 | map_addr = elf_map(interpreter, load_addr + vaddr, | |
bb1ad820 | 471 | eppnt, elf_prot, elf_type, total_size); |
cc503c1b JK |
472 | total_size = 0; |
473 | if (!*interp_map_addr) | |
474 | *interp_map_addr = map_addr; | |
f4e5cc2c JJ |
475 | error = map_addr; |
476 | if (BAD_ADDR(map_addr)) | |
477 | goto out_close; | |
478 | ||
479 | if (!load_addr_set && | |
480 | interp_elf_ex->e_type == ET_DYN) { | |
481 | load_addr = map_addr - ELF_PAGESTART(vaddr); | |
482 | load_addr_set = 1; | |
483 | } | |
484 | ||
485 | /* | |
486 | * Check to see if the section's size will overflow the | |
487 | * allowed task size. Note that p_filesz must always be | |
488 | * <= p_memsize so it's only necessary to check p_memsz. | |
489 | */ | |
490 | k = load_addr + eppnt->p_vaddr; | |
ce51059b | 491 | if (BAD_ADDR(k) || |
f4e5cc2c JJ |
492 | eppnt->p_filesz > eppnt->p_memsz || |
493 | eppnt->p_memsz > TASK_SIZE || | |
494 | TASK_SIZE - eppnt->p_memsz < k) { | |
495 | error = -ENOMEM; | |
496 | goto out_close; | |
497 | } | |
498 | ||
499 | /* | |
500 | * Find the end of the file mapping for this phdr, and | |
501 | * keep track of the largest address we see for this. | |
502 | */ | |
503 | k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; | |
504 | if (k > elf_bss) | |
505 | elf_bss = k; | |
506 | ||
507 | /* | |
508 | * Do the same thing for the memory mapping - between | |
509 | * elf_bss and last_bss is the bss section. | |
510 | */ | |
511 | k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; | |
512 | if (k > last_bss) | |
513 | last_bss = k; | |
514 | } | |
1da177e4 LT |
515 | } |
516 | ||
752015d1 RM |
517 | if (last_bss > elf_bss) { |
518 | /* | |
519 | * Now fill out the bss section. First pad the last page up | |
520 | * to the page boundary, and then perform a mmap to make sure | |
521 | * that there are zero-mapped pages up to and including the | |
522 | * last bss page. | |
523 | */ | |
524 | if (padzero(elf_bss)) { | |
525 | error = -EFAULT; | |
526 | goto out_close; | |
527 | } | |
1da177e4 | 528 | |
752015d1 RM |
529 | /* What we have mapped so far */ |
530 | elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1); | |
1da177e4 | 531 | |
752015d1 | 532 | /* Map the last of the bss segment */ |
e4eb1ff6 | 533 | error = vm_brk(elf_bss, last_bss - elf_bss); |
1da177e4 LT |
534 | if (BAD_ADDR(error)) |
535 | goto out_close; | |
536 | } | |
537 | ||
cc503c1b | 538 | error = load_addr; |
1da177e4 LT |
539 | |
540 | out_close: | |
541 | kfree(elf_phdata); | |
542 | out: | |
543 | return error; | |
544 | } | |
545 | ||
1da177e4 LT |
546 | /* |
547 | * These are the functions used to load ELF style executables and shared | |
548 | * libraries. There is no binary dependent code anywhere else. | |
549 | */ | |
550 | ||
913bd906 | 551 | #ifndef STACK_RND_MASK |
d1cabd63 | 552 | #define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) /* 8MB of VA */ |
913bd906 | 553 | #endif |
1da177e4 LT |
554 | |
555 | static unsigned long randomize_stack_top(unsigned long stack_top) | |
556 | { | |
557 | unsigned int random_variable = 0; | |
558 | ||
c16b63e0 AK |
559 | if ((current->flags & PF_RANDOMIZE) && |
560 | !(current->personality & ADDR_NO_RANDOMIZE)) { | |
913bd906 AK |
561 | random_variable = get_random_int() & STACK_RND_MASK; |
562 | random_variable <<= PAGE_SHIFT; | |
563 | } | |
1da177e4 | 564 | #ifdef CONFIG_STACK_GROWSUP |
913bd906 | 565 | return PAGE_ALIGN(stack_top) + random_variable; |
1da177e4 | 566 | #else |
913bd906 | 567 | return PAGE_ALIGN(stack_top) - random_variable; |
1da177e4 LT |
568 | #endif |
569 | } | |
570 | ||
71613c3b | 571 | static int load_elf_binary(struct linux_binprm *bprm) |
1da177e4 LT |
572 | { |
573 | struct file *interpreter = NULL; /* to shut gcc up */ | |
574 | unsigned long load_addr = 0, load_bias = 0; | |
575 | int load_addr_set = 0; | |
576 | char * elf_interpreter = NULL; | |
1da177e4 | 577 | unsigned long error; |
f4e5cc2c | 578 | struct elf_phdr *elf_ppnt, *elf_phdata; |
1da177e4 | 579 | unsigned long elf_bss, elf_brk; |
1da177e4 LT |
580 | int retval, i; |
581 | unsigned int size; | |
cc503c1b JK |
582 | unsigned long elf_entry; |
583 | unsigned long interp_load_addr = 0; | |
1da177e4 | 584 | unsigned long start_code, end_code, start_data, end_data; |
1a530a6f | 585 | unsigned long reloc_func_desc __maybe_unused = 0; |
8de61e69 | 586 | int executable_stack = EXSTACK_DEFAULT; |
71613c3b | 587 | struct pt_regs *regs = current_pt_regs(); |
1da177e4 LT |
588 | struct { |
589 | struct elfhdr elf_ex; | |
590 | struct elfhdr interp_elf_ex; | |
1da177e4 LT |
591 | } *loc; |
592 | ||
593 | loc = kmalloc(sizeof(*loc), GFP_KERNEL); | |
594 | if (!loc) { | |
595 | retval = -ENOMEM; | |
596 | goto out_ret; | |
597 | } | |
598 | ||
599 | /* Get the exec-header */ | |
f4e5cc2c | 600 | loc->elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4 LT |
601 | |
602 | retval = -ENOEXEC; | |
603 | /* First of all, some simple consistency checks */ | |
604 | if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
605 | goto out; | |
606 | ||
607 | if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN) | |
608 | goto out; | |
609 | if (!elf_check_arch(&loc->elf_ex)) | |
610 | goto out; | |
72c2d531 | 611 | if (!bprm->file->f_op->mmap) |
1da177e4 LT |
612 | goto out; |
613 | ||
614 | /* Now read in all of the header information */ | |
1da177e4 LT |
615 | if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr)) |
616 | goto out; | |
617 | if (loc->elf_ex.e_phnum < 1 || | |
618 | loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr)) | |
619 | goto out; | |
620 | size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr); | |
621 | retval = -ENOMEM; | |
f4e5cc2c | 622 | elf_phdata = kmalloc(size, GFP_KERNEL); |
1da177e4 LT |
623 | if (!elf_phdata) |
624 | goto out; | |
625 | ||
f4e5cc2c JJ |
626 | retval = kernel_read(bprm->file, loc->elf_ex.e_phoff, |
627 | (char *)elf_phdata, size); | |
1da177e4 LT |
628 | if (retval != size) { |
629 | if (retval >= 0) | |
630 | retval = -EIO; | |
631 | goto out_free_ph; | |
632 | } | |
633 | ||
1da177e4 LT |
634 | elf_ppnt = elf_phdata; |
635 | elf_bss = 0; | |
636 | elf_brk = 0; | |
637 | ||
638 | start_code = ~0UL; | |
639 | end_code = 0; | |
640 | start_data = 0; | |
641 | end_data = 0; | |
642 | ||
643 | for (i = 0; i < loc->elf_ex.e_phnum; i++) { | |
644 | if (elf_ppnt->p_type == PT_INTERP) { | |
645 | /* This is the program interpreter used for | |
646 | * shared libraries - for now assume that this | |
647 | * is an a.out format binary | |
648 | */ | |
1da177e4 LT |
649 | retval = -ENOEXEC; |
650 | if (elf_ppnt->p_filesz > PATH_MAX || | |
651 | elf_ppnt->p_filesz < 2) | |
e7b9b550 | 652 | goto out_free_ph; |
1da177e4 LT |
653 | |
654 | retval = -ENOMEM; | |
792db3af | 655 | elf_interpreter = kmalloc(elf_ppnt->p_filesz, |
f4e5cc2c | 656 | GFP_KERNEL); |
1da177e4 | 657 | if (!elf_interpreter) |
e7b9b550 | 658 | goto out_free_ph; |
1da177e4 LT |
659 | |
660 | retval = kernel_read(bprm->file, elf_ppnt->p_offset, | |
f4e5cc2c JJ |
661 | elf_interpreter, |
662 | elf_ppnt->p_filesz); | |
1da177e4 LT |
663 | if (retval != elf_ppnt->p_filesz) { |
664 | if (retval >= 0) | |
665 | retval = -EIO; | |
666 | goto out_free_interp; | |
667 | } | |
668 | /* make sure path is NULL terminated */ | |
669 | retval = -ENOEXEC; | |
670 | if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0') | |
671 | goto out_free_interp; | |
672 | ||
1da177e4 LT |
673 | interpreter = open_exec(elf_interpreter); |
674 | retval = PTR_ERR(interpreter); | |
675 | if (IS_ERR(interpreter)) | |
676 | goto out_free_interp; | |
1fb84496 AD |
677 | |
678 | /* | |
679 | * If the binary is not readable then enforce | |
680 | * mm->dumpable = 0 regardless of the interpreter's | |
681 | * permissions. | |
682 | */ | |
1b5d783c | 683 | would_dump(bprm, interpreter); |
1fb84496 | 684 | |
f4e5cc2c JJ |
685 | retval = kernel_read(interpreter, 0, bprm->buf, |
686 | BINPRM_BUF_SIZE); | |
1da177e4 LT |
687 | if (retval != BINPRM_BUF_SIZE) { |
688 | if (retval >= 0) | |
689 | retval = -EIO; | |
690 | goto out_free_dentry; | |
691 | } | |
692 | ||
693 | /* Get the exec headers */ | |
f4e5cc2c | 694 | loc->interp_elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4 LT |
695 | break; |
696 | } | |
697 | elf_ppnt++; | |
698 | } | |
699 | ||
700 | elf_ppnt = elf_phdata; | |
701 | for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) | |
702 | if (elf_ppnt->p_type == PT_GNU_STACK) { | |
703 | if (elf_ppnt->p_flags & PF_X) | |
704 | executable_stack = EXSTACK_ENABLE_X; | |
705 | else | |
706 | executable_stack = EXSTACK_DISABLE_X; | |
707 | break; | |
708 | } | |
1da177e4 LT |
709 | |
710 | /* Some simple consistency checks for the interpreter */ | |
711 | if (elf_interpreter) { | |
1da177e4 | 712 | retval = -ELIBBAD; |
d20894a2 AK |
713 | /* Not an ELF interpreter */ |
714 | if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1da177e4 | 715 | goto out_free_dentry; |
1da177e4 | 716 | /* Verify the interpreter has a valid arch */ |
d20894a2 | 717 | if (!elf_check_arch(&loc->interp_elf_ex)) |
1da177e4 | 718 | goto out_free_dentry; |
1da177e4 LT |
719 | } |
720 | ||
1da177e4 LT |
721 | /* Flush all traces of the currently running executable */ |
722 | retval = flush_old_exec(bprm); | |
723 | if (retval) | |
724 | goto out_free_dentry; | |
725 | ||
1da177e4 LT |
726 | /* Do this immediately, since STACK_TOP as used in setup_arg_pages |
727 | may depend on the personality. */ | |
0b592682 | 728 | SET_PERSONALITY(loc->elf_ex); |
1da177e4 LT |
729 | if (elf_read_implies_exec(loc->elf_ex, executable_stack)) |
730 | current->personality |= READ_IMPLIES_EXEC; | |
731 | ||
f4e5cc2c | 732 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
1da177e4 | 733 | current->flags |= PF_RANDOMIZE; |
221af7f8 LT |
734 | |
735 | setup_new_exec(bprm); | |
1da177e4 LT |
736 | |
737 | /* Do this so that we can load the interpreter, if need be. We will | |
738 | change some of these later */ | |
1da177e4 LT |
739 | retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP), |
740 | executable_stack); | |
19d860a1 | 741 | if (retval < 0) |
1da177e4 | 742 | goto out_free_dentry; |
1da177e4 | 743 | |
1da177e4 LT |
744 | current->mm->start_stack = bprm->p; |
745 | ||
af901ca1 | 746 | /* Now we do a little grungy work by mmapping the ELF image into |
cc503c1b | 747 | the correct location in memory. */ |
f4e5cc2c JJ |
748 | for(i = 0, elf_ppnt = elf_phdata; |
749 | i < loc->elf_ex.e_phnum; i++, elf_ppnt++) { | |
1da177e4 LT |
750 | int elf_prot = 0, elf_flags; |
751 | unsigned long k, vaddr; | |
752 | ||
753 | if (elf_ppnt->p_type != PT_LOAD) | |
754 | continue; | |
755 | ||
756 | if (unlikely (elf_brk > elf_bss)) { | |
757 | unsigned long nbyte; | |
758 | ||
759 | /* There was a PT_LOAD segment with p_memsz > p_filesz | |
760 | before this one. Map anonymous pages, if needed, | |
761 | and clear the area. */ | |
f670d0ec MP |
762 | retval = set_brk(elf_bss + load_bias, |
763 | elf_brk + load_bias); | |
19d860a1 | 764 | if (retval) |
1da177e4 | 765 | goto out_free_dentry; |
1da177e4 LT |
766 | nbyte = ELF_PAGEOFFSET(elf_bss); |
767 | if (nbyte) { | |
768 | nbyte = ELF_MIN_ALIGN - nbyte; | |
769 | if (nbyte > elf_brk - elf_bss) | |
770 | nbyte = elf_brk - elf_bss; | |
771 | if (clear_user((void __user *)elf_bss + | |
772 | load_bias, nbyte)) { | |
773 | /* | |
774 | * This bss-zeroing can fail if the ELF | |
f4e5cc2c | 775 | * file specifies odd protections. So |
1da177e4 LT |
776 | * we don't check the return value |
777 | */ | |
778 | } | |
779 | } | |
780 | } | |
781 | ||
f4e5cc2c JJ |
782 | if (elf_ppnt->p_flags & PF_R) |
783 | elf_prot |= PROT_READ; | |
784 | if (elf_ppnt->p_flags & PF_W) | |
785 | elf_prot |= PROT_WRITE; | |
786 | if (elf_ppnt->p_flags & PF_X) | |
787 | elf_prot |= PROT_EXEC; | |
1da177e4 | 788 | |
f4e5cc2c | 789 | elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE; |
1da177e4 LT |
790 | |
791 | vaddr = elf_ppnt->p_vaddr; | |
792 | if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) { | |
793 | elf_flags |= MAP_FIXED; | |
794 | } else if (loc->elf_ex.e_type == ET_DYN) { | |
f4e5cc2c JJ |
795 | /* Try and get dynamic programs out of the way of the |
796 | * default mmap base, as well as whatever program they | |
797 | * might try to exec. This is because the brk will | |
798 | * follow the loader, and is not movable. */ | |
e39f5602 | 799 | #ifdef CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE |
a3defbe5 | 800 | /* Memory randomization might have been switched off |
c1d025e2 JK |
801 | * in runtime via sysctl or explicit setting of |
802 | * personality flags. | |
a3defbe5 JK |
803 | * If that is the case, retain the original non-zero |
804 | * load_bias value in order to establish proper | |
805 | * non-randomized mappings. | |
806 | */ | |
807 | if (current->flags & PF_RANDOMIZE) | |
808 | load_bias = 0; | |
809 | else | |
810 | load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); | |
cc503c1b | 811 | #else |
90cb28e8 | 812 | load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); |
cc503c1b | 813 | #endif |
1da177e4 LT |
814 | } |
815 | ||
f4e5cc2c | 816 | error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, |
bb1ad820 | 817 | elf_prot, elf_flags, 0); |
1da177e4 | 818 | if (BAD_ADDR(error)) { |
b140f251 AK |
819 | retval = IS_ERR((void *)error) ? |
820 | PTR_ERR((void*)error) : -EINVAL; | |
1da177e4 LT |
821 | goto out_free_dentry; |
822 | } | |
823 | ||
824 | if (!load_addr_set) { | |
825 | load_addr_set = 1; | |
826 | load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset); | |
827 | if (loc->elf_ex.e_type == ET_DYN) { | |
828 | load_bias += error - | |
829 | ELF_PAGESTART(load_bias + vaddr); | |
830 | load_addr += load_bias; | |
831 | reloc_func_desc = load_bias; | |
832 | } | |
833 | } | |
834 | k = elf_ppnt->p_vaddr; | |
f4e5cc2c JJ |
835 | if (k < start_code) |
836 | start_code = k; | |
837 | if (start_data < k) | |
838 | start_data = k; | |
1da177e4 LT |
839 | |
840 | /* | |
841 | * Check to see if the section's size will overflow the | |
842 | * allowed task size. Note that p_filesz must always be | |
843 | * <= p_memsz so it is only necessary to check p_memsz. | |
844 | */ | |
ce51059b | 845 | if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz || |
1da177e4 LT |
846 | elf_ppnt->p_memsz > TASK_SIZE || |
847 | TASK_SIZE - elf_ppnt->p_memsz < k) { | |
f4e5cc2c | 848 | /* set_brk can never work. Avoid overflows. */ |
b140f251 | 849 | retval = -EINVAL; |
1da177e4 LT |
850 | goto out_free_dentry; |
851 | } | |
852 | ||
853 | k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; | |
854 | ||
855 | if (k > elf_bss) | |
856 | elf_bss = k; | |
857 | if ((elf_ppnt->p_flags & PF_X) && end_code < k) | |
858 | end_code = k; | |
859 | if (end_data < k) | |
860 | end_data = k; | |
861 | k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; | |
862 | if (k > elf_brk) | |
863 | elf_brk = k; | |
864 | } | |
865 | ||
866 | loc->elf_ex.e_entry += load_bias; | |
867 | elf_bss += load_bias; | |
868 | elf_brk += load_bias; | |
869 | start_code += load_bias; | |
870 | end_code += load_bias; | |
871 | start_data += load_bias; | |
872 | end_data += load_bias; | |
873 | ||
874 | /* Calling set_brk effectively mmaps the pages that we need | |
875 | * for the bss and break sections. We must do this before | |
876 | * mapping in the interpreter, to make sure it doesn't wind | |
877 | * up getting placed where the bss needs to go. | |
878 | */ | |
879 | retval = set_brk(elf_bss, elf_brk); | |
19d860a1 | 880 | if (retval) |
1da177e4 | 881 | goto out_free_dentry; |
6de50517 | 882 | if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) { |
1da177e4 LT |
883 | retval = -EFAULT; /* Nobody gets to see this, but.. */ |
884 | goto out_free_dentry; | |
885 | } | |
886 | ||
887 | if (elf_interpreter) { | |
6eec482f | 888 | unsigned long interp_map_addr = 0; |
d20894a2 AK |
889 | |
890 | elf_entry = load_elf_interp(&loc->interp_elf_ex, | |
891 | interpreter, | |
892 | &interp_map_addr, | |
893 | load_bias); | |
894 | if (!IS_ERR((void *)elf_entry)) { | |
895 | /* | |
896 | * load_elf_interp() returns relocation | |
897 | * adjustment | |
898 | */ | |
899 | interp_load_addr = elf_entry; | |
900 | elf_entry += loc->interp_elf_ex.e_entry; | |
cc503c1b | 901 | } |
1da177e4 | 902 | if (BAD_ADDR(elf_entry)) { |
ce51059b CE |
903 | retval = IS_ERR((void *)elf_entry) ? |
904 | (int)elf_entry : -EINVAL; | |
1da177e4 LT |
905 | goto out_free_dentry; |
906 | } | |
907 | reloc_func_desc = interp_load_addr; | |
908 | ||
909 | allow_write_access(interpreter); | |
910 | fput(interpreter); | |
911 | kfree(elf_interpreter); | |
912 | } else { | |
913 | elf_entry = loc->elf_ex.e_entry; | |
5342fba5 | 914 | if (BAD_ADDR(elf_entry)) { |
ce51059b | 915 | retval = -EINVAL; |
5342fba5 SS |
916 | goto out_free_dentry; |
917 | } | |
1da177e4 LT |
918 | } |
919 | ||
920 | kfree(elf_phdata); | |
921 | ||
1da177e4 LT |
922 | set_binfmt(&elf_format); |
923 | ||
547ee84c | 924 | #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
fc5243d9 | 925 | retval = arch_setup_additional_pages(bprm, !!elf_interpreter); |
19d860a1 | 926 | if (retval < 0) |
18c8baff | 927 | goto out; |
547ee84c BH |
928 | #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */ |
929 | ||
a6f76f23 | 930 | install_exec_creds(bprm); |
b6a2fea3 | 931 | retval = create_elf_tables(bprm, &loc->elf_ex, |
f4e5cc2c | 932 | load_addr, interp_load_addr); |
19d860a1 | 933 | if (retval < 0) |
b6a2fea3 | 934 | goto out; |
1da177e4 | 935 | /* N.B. passed_fileno might not be initialized? */ |
1da177e4 LT |
936 | current->mm->end_code = end_code; |
937 | current->mm->start_code = start_code; | |
938 | current->mm->start_data = start_data; | |
939 | current->mm->end_data = end_data; | |
940 | current->mm->start_stack = bprm->p; | |
941 | ||
c1d171a0 | 942 | #ifdef arch_randomize_brk |
4471a675 | 943 | if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) { |
c1d171a0 JK |
944 | current->mm->brk = current->mm->start_brk = |
945 | arch_randomize_brk(current->mm); | |
4471a675 JK |
946 | #ifdef CONFIG_COMPAT_BRK |
947 | current->brk_randomized = 1; | |
948 | #endif | |
949 | } | |
c1d171a0 JK |
950 | #endif |
951 | ||
1da177e4 LT |
952 | if (current->personality & MMAP_PAGE_ZERO) { |
953 | /* Why this, you ask??? Well SVr4 maps page 0 as read-only, | |
954 | and some applications "depend" upon this behavior. | |
955 | Since we do not have the power to recompile these, we | |
f4e5cc2c | 956 | emulate the SVr4 behavior. Sigh. */ |
6be5ceb0 | 957 | error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC, |
1da177e4 | 958 | MAP_FIXED | MAP_PRIVATE, 0); |
1da177e4 LT |
959 | } |
960 | ||
961 | #ifdef ELF_PLAT_INIT | |
962 | /* | |
963 | * The ABI may specify that certain registers be set up in special | |
964 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
965 | * example. In addition, it may also specify (eg, PowerPC64 ELF) | |
966 | * that the e_entry field is the address of the function descriptor | |
967 | * for the startup routine, rather than the address of the startup | |
968 | * routine itself. This macro performs whatever initialization to | |
969 | * the regs structure is required as well as any relocations to the | |
970 | * function descriptor entries when executing dynamically links apps. | |
971 | */ | |
972 | ELF_PLAT_INIT(regs, reloc_func_desc); | |
973 | #endif | |
974 | ||
975 | start_thread(regs, elf_entry, bprm->p); | |
1da177e4 LT |
976 | retval = 0; |
977 | out: | |
978 | kfree(loc); | |
979 | out_ret: | |
980 | return retval; | |
981 | ||
982 | /* error cleanup */ | |
983 | out_free_dentry: | |
984 | allow_write_access(interpreter); | |
985 | if (interpreter) | |
986 | fput(interpreter); | |
987 | out_free_interp: | |
f99d49ad | 988 | kfree(elf_interpreter); |
1da177e4 LT |
989 | out_free_ph: |
990 | kfree(elf_phdata); | |
991 | goto out; | |
992 | } | |
993 | ||
69369a70 | 994 | #ifdef CONFIG_USELIB |
1da177e4 LT |
995 | /* This is really simpleminded and specialized - we are loading an |
996 | a.out library that is given an ELF header. */ | |
1da177e4 LT |
997 | static int load_elf_library(struct file *file) |
998 | { | |
999 | struct elf_phdr *elf_phdata; | |
1000 | struct elf_phdr *eppnt; | |
1001 | unsigned long elf_bss, bss, len; | |
1002 | int retval, error, i, j; | |
1003 | struct elfhdr elf_ex; | |
1004 | ||
1005 | error = -ENOEXEC; | |
f4e5cc2c | 1006 | retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex)); |
1da177e4 LT |
1007 | if (retval != sizeof(elf_ex)) |
1008 | goto out; | |
1009 | ||
1010 | if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1011 | goto out; | |
1012 | ||
1013 | /* First of all, some simple consistency checks */ | |
1014 | if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 || | |
72c2d531 | 1015 | !elf_check_arch(&elf_ex) || !file->f_op->mmap) |
1da177e4 LT |
1016 | goto out; |
1017 | ||
1018 | /* Now read in all of the header information */ | |
1019 | ||
1020 | j = sizeof(struct elf_phdr) * elf_ex.e_phnum; | |
1021 | /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */ | |
1022 | ||
1023 | error = -ENOMEM; | |
1024 | elf_phdata = kmalloc(j, GFP_KERNEL); | |
1025 | if (!elf_phdata) | |
1026 | goto out; | |
1027 | ||
1028 | eppnt = elf_phdata; | |
1029 | error = -ENOEXEC; | |
1030 | retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j); | |
1031 | if (retval != j) | |
1032 | goto out_free_ph; | |
1033 | ||
1034 | for (j = 0, i = 0; i<elf_ex.e_phnum; i++) | |
1035 | if ((eppnt + i)->p_type == PT_LOAD) | |
1036 | j++; | |
1037 | if (j != 1) | |
1038 | goto out_free_ph; | |
1039 | ||
1040 | while (eppnt->p_type != PT_LOAD) | |
1041 | eppnt++; | |
1042 | ||
1043 | /* Now use mmap to map the library into memory. */ | |
6be5ceb0 | 1044 | error = vm_mmap(file, |
1da177e4 LT |
1045 | ELF_PAGESTART(eppnt->p_vaddr), |
1046 | (eppnt->p_filesz + | |
1047 | ELF_PAGEOFFSET(eppnt->p_vaddr)), | |
1048 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
1049 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, | |
1050 | (eppnt->p_offset - | |
1051 | ELF_PAGEOFFSET(eppnt->p_vaddr))); | |
1da177e4 LT |
1052 | if (error != ELF_PAGESTART(eppnt->p_vaddr)) |
1053 | goto out_free_ph; | |
1054 | ||
1055 | elf_bss = eppnt->p_vaddr + eppnt->p_filesz; | |
1056 | if (padzero(elf_bss)) { | |
1057 | error = -EFAULT; | |
1058 | goto out_free_ph; | |
1059 | } | |
1060 | ||
f4e5cc2c JJ |
1061 | len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + |
1062 | ELF_MIN_ALIGN - 1); | |
1da177e4 | 1063 | bss = eppnt->p_memsz + eppnt->p_vaddr; |
e4eb1ff6 LT |
1064 | if (bss > len) |
1065 | vm_brk(len, bss - len); | |
1da177e4 LT |
1066 | error = 0; |
1067 | ||
1068 | out_free_ph: | |
1069 | kfree(elf_phdata); | |
1070 | out: | |
1071 | return error; | |
1072 | } | |
69369a70 | 1073 | #endif /* #ifdef CONFIG_USELIB */ |
1da177e4 | 1074 | |
698ba7b5 | 1075 | #ifdef CONFIG_ELF_CORE |
1da177e4 LT |
1076 | /* |
1077 | * ELF core dumper | |
1078 | * | |
1079 | * Modelled on fs/exec.c:aout_core_dump() | |
1080 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1081 | */ | |
1da177e4 | 1082 | |
909af768 JB |
1083 | /* |
1084 | * The purpose of always_dump_vma() is to make sure that special kernel mappings | |
1085 | * that are useful for post-mortem analysis are included in every core dump. | |
1086 | * In that way we ensure that the core dump is fully interpretable later | |
1087 | * without matching up the same kernel and hardware config to see what PC values | |
1088 | * meant. These special mappings include - vDSO, vsyscall, and other | |
1089 | * architecture specific mappings | |
1090 | */ | |
1091 | static bool always_dump_vma(struct vm_area_struct *vma) | |
1092 | { | |
1093 | /* Any vsyscall mappings? */ | |
1094 | if (vma == get_gate_vma(vma->vm_mm)) | |
1095 | return true; | |
78d683e8 AL |
1096 | |
1097 | /* | |
1098 | * Assume that all vmas with a .name op should always be dumped. | |
1099 | * If this changes, a new vm_ops field can easily be added. | |
1100 | */ | |
1101 | if (vma->vm_ops && vma->vm_ops->name && vma->vm_ops->name(vma)) | |
1102 | return true; | |
1103 | ||
909af768 JB |
1104 | /* |
1105 | * arch_vma_name() returns non-NULL for special architecture mappings, | |
1106 | * such as vDSO sections. | |
1107 | */ | |
1108 | if (arch_vma_name(vma)) | |
1109 | return true; | |
1110 | ||
1111 | return false; | |
1112 | } | |
1113 | ||
1da177e4 | 1114 | /* |
82df3973 | 1115 | * Decide what to dump of a segment, part, all or none. |
1da177e4 | 1116 | */ |
82df3973 RM |
1117 | static unsigned long vma_dump_size(struct vm_area_struct *vma, |
1118 | unsigned long mm_flags) | |
1da177e4 | 1119 | { |
e575f111 KM |
1120 | #define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type)) |
1121 | ||
909af768 JB |
1122 | /* always dump the vdso and vsyscall sections */ |
1123 | if (always_dump_vma(vma)) | |
82df3973 | 1124 | goto whole; |
e5b97dde | 1125 | |
0103bd16 | 1126 | if (vma->vm_flags & VM_DONTDUMP) |
accb61fe JB |
1127 | return 0; |
1128 | ||
e575f111 KM |
1129 | /* Hugetlb memory check */ |
1130 | if (vma->vm_flags & VM_HUGETLB) { | |
1131 | if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED)) | |
1132 | goto whole; | |
1133 | if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE)) | |
1134 | goto whole; | |
23d9e482 | 1135 | return 0; |
e575f111 KM |
1136 | } |
1137 | ||
1da177e4 | 1138 | /* Do not dump I/O mapped devices or special mappings */ |
314e51b9 | 1139 | if (vma->vm_flags & VM_IO) |
1da177e4 LT |
1140 | return 0; |
1141 | ||
a1b59e80 KH |
1142 | /* By default, dump shared memory if mapped from an anonymous file. */ |
1143 | if (vma->vm_flags & VM_SHARED) { | |
496ad9aa | 1144 | if (file_inode(vma->vm_file)->i_nlink == 0 ? |
82df3973 RM |
1145 | FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED)) |
1146 | goto whole; | |
1147 | return 0; | |
a1b59e80 | 1148 | } |
1da177e4 | 1149 | |
82df3973 RM |
1150 | /* Dump segments that have been written to. */ |
1151 | if (vma->anon_vma && FILTER(ANON_PRIVATE)) | |
1152 | goto whole; | |
1153 | if (vma->vm_file == NULL) | |
1154 | return 0; | |
1da177e4 | 1155 | |
82df3973 RM |
1156 | if (FILTER(MAPPED_PRIVATE)) |
1157 | goto whole; | |
1158 | ||
1159 | /* | |
1160 | * If this looks like the beginning of a DSO or executable mapping, | |
1161 | * check for an ELF header. If we find one, dump the first page to | |
1162 | * aid in determining what was mapped here. | |
1163 | */ | |
92dc07b1 RM |
1164 | if (FILTER(ELF_HEADERS) && |
1165 | vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) { | |
82df3973 RM |
1166 | u32 __user *header = (u32 __user *) vma->vm_start; |
1167 | u32 word; | |
92dc07b1 | 1168 | mm_segment_t fs = get_fs(); |
82df3973 RM |
1169 | /* |
1170 | * Doing it this way gets the constant folded by GCC. | |
1171 | */ | |
1172 | union { | |
1173 | u32 cmp; | |
1174 | char elfmag[SELFMAG]; | |
1175 | } magic; | |
1176 | BUILD_BUG_ON(SELFMAG != sizeof word); | |
1177 | magic.elfmag[EI_MAG0] = ELFMAG0; | |
1178 | magic.elfmag[EI_MAG1] = ELFMAG1; | |
1179 | magic.elfmag[EI_MAG2] = ELFMAG2; | |
1180 | magic.elfmag[EI_MAG3] = ELFMAG3; | |
92dc07b1 RM |
1181 | /* |
1182 | * Switch to the user "segment" for get_user(), | |
1183 | * then put back what elf_core_dump() had in place. | |
1184 | */ | |
1185 | set_fs(USER_DS); | |
1186 | if (unlikely(get_user(word, header))) | |
1187 | word = 0; | |
1188 | set_fs(fs); | |
1189 | if (word == magic.cmp) | |
82df3973 RM |
1190 | return PAGE_SIZE; |
1191 | } | |
1192 | ||
1193 | #undef FILTER | |
1194 | ||
1195 | return 0; | |
1196 | ||
1197 | whole: | |
1198 | return vma->vm_end - vma->vm_start; | |
1da177e4 LT |
1199 | } |
1200 | ||
1da177e4 LT |
1201 | /* An ELF note in memory */ |
1202 | struct memelfnote | |
1203 | { | |
1204 | const char *name; | |
1205 | int type; | |
1206 | unsigned int datasz; | |
1207 | void *data; | |
1208 | }; | |
1209 | ||
1210 | static int notesize(struct memelfnote *en) | |
1211 | { | |
1212 | int sz; | |
1213 | ||
1214 | sz = sizeof(struct elf_note); | |
1215 | sz += roundup(strlen(en->name) + 1, 4); | |
1216 | sz += roundup(en->datasz, 4); | |
1217 | ||
1218 | return sz; | |
1219 | } | |
1220 | ||
ecc8c772 | 1221 | static int writenote(struct memelfnote *men, struct coredump_params *cprm) |
d025c9db AK |
1222 | { |
1223 | struct elf_note en; | |
1da177e4 LT |
1224 | en.n_namesz = strlen(men->name) + 1; |
1225 | en.n_descsz = men->datasz; | |
1226 | en.n_type = men->type; | |
1227 | ||
ecc8c772 | 1228 | return dump_emit(cprm, &en, sizeof(en)) && |
22a8cb82 AV |
1229 | dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) && |
1230 | dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4); | |
1da177e4 | 1231 | } |
1da177e4 | 1232 | |
3aba481f | 1233 | static void fill_elf_header(struct elfhdr *elf, int segs, |
d3330cf0 | 1234 | u16 machine, u32 flags) |
1da177e4 | 1235 | { |
6970c8ef CG |
1236 | memset(elf, 0, sizeof(*elf)); |
1237 | ||
1da177e4 LT |
1238 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
1239 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1240 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1241 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1242 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1da177e4 LT |
1243 | |
1244 | elf->e_type = ET_CORE; | |
3aba481f | 1245 | elf->e_machine = machine; |
1da177e4 | 1246 | elf->e_version = EV_CURRENT; |
1da177e4 | 1247 | elf->e_phoff = sizeof(struct elfhdr); |
3aba481f | 1248 | elf->e_flags = flags; |
1da177e4 LT |
1249 | elf->e_ehsize = sizeof(struct elfhdr); |
1250 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1251 | elf->e_phnum = segs; | |
6970c8ef | 1252 | |
1da177e4 LT |
1253 | return; |
1254 | } | |
1255 | ||
8d6b5eee | 1256 | static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1da177e4 LT |
1257 | { |
1258 | phdr->p_type = PT_NOTE; | |
1259 | phdr->p_offset = offset; | |
1260 | phdr->p_vaddr = 0; | |
1261 | phdr->p_paddr = 0; | |
1262 | phdr->p_filesz = sz; | |
1263 | phdr->p_memsz = 0; | |
1264 | phdr->p_flags = 0; | |
1265 | phdr->p_align = 0; | |
1266 | return; | |
1267 | } | |
1268 | ||
1269 | static void fill_note(struct memelfnote *note, const char *name, int type, | |
1270 | unsigned int sz, void *data) | |
1271 | { | |
1272 | note->name = name; | |
1273 | note->type = type; | |
1274 | note->datasz = sz; | |
1275 | note->data = data; | |
1276 | return; | |
1277 | } | |
1278 | ||
1279 | /* | |
f4e5cc2c JJ |
1280 | * fill up all the fields in prstatus from the given task struct, except |
1281 | * registers which need to be filled up separately. | |
1da177e4 LT |
1282 | */ |
1283 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
f4e5cc2c | 1284 | struct task_struct *p, long signr) |
1da177e4 LT |
1285 | { |
1286 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1287 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1288 | prstatus->pr_sighold = p->blocked.sig[0]; | |
3b34fc58 ON |
1289 | rcu_read_lock(); |
1290 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1291 | rcu_read_unlock(); | |
b488893a | 1292 | prstatus->pr_pid = task_pid_vnr(p); |
b488893a PE |
1293 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1294 | prstatus->pr_sid = task_session_vnr(p); | |
1da177e4 | 1295 | if (thread_group_leader(p)) { |
f06febc9 FM |
1296 | struct task_cputime cputime; |
1297 | ||
1da177e4 | 1298 | /* |
f06febc9 FM |
1299 | * This is the record for the group leader. It shows the |
1300 | * group-wide total, not its individual thread total. | |
1da177e4 | 1301 | */ |
f06febc9 FM |
1302 | thread_group_cputime(p, &cputime); |
1303 | cputime_to_timeval(cputime.utime, &prstatus->pr_utime); | |
1304 | cputime_to_timeval(cputime.stime, &prstatus->pr_stime); | |
1da177e4 | 1305 | } else { |
6fac4829 FW |
1306 | cputime_t utime, stime; |
1307 | ||
1308 | task_cputime(p, &utime, &stime); | |
1309 | cputime_to_timeval(utime, &prstatus->pr_utime); | |
1310 | cputime_to_timeval(stime, &prstatus->pr_stime); | |
1da177e4 LT |
1311 | } |
1312 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); | |
1313 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); | |
1314 | } | |
1315 | ||
1316 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1317 | struct mm_struct *mm) | |
1318 | { | |
c69e8d9c | 1319 | const struct cred *cred; |
a84a5059 | 1320 | unsigned int i, len; |
1da177e4 LT |
1321 | |
1322 | /* first copy the parameters from user space */ | |
1323 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1324 | ||
1325 | len = mm->arg_end - mm->arg_start; | |
1326 | if (len >= ELF_PRARGSZ) | |
1327 | len = ELF_PRARGSZ-1; | |
1328 | if (copy_from_user(&psinfo->pr_psargs, | |
1329 | (const char __user *)mm->arg_start, len)) | |
1330 | return -EFAULT; | |
1331 | for(i = 0; i < len; i++) | |
1332 | if (psinfo->pr_psargs[i] == 0) | |
1333 | psinfo->pr_psargs[i] = ' '; | |
1334 | psinfo->pr_psargs[len] = 0; | |
1335 | ||
3b34fc58 ON |
1336 | rcu_read_lock(); |
1337 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1338 | rcu_read_unlock(); | |
b488893a | 1339 | psinfo->pr_pid = task_pid_vnr(p); |
b488893a PE |
1340 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1341 | psinfo->pr_sid = task_session_vnr(p); | |
1da177e4 LT |
1342 | |
1343 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1344 | psinfo->pr_state = i; | |
55148548 | 1345 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1da177e4 LT |
1346 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
1347 | psinfo->pr_nice = task_nice(p); | |
1348 | psinfo->pr_flag = p->flags; | |
c69e8d9c DH |
1349 | rcu_read_lock(); |
1350 | cred = __task_cred(p); | |
ebc887b2 EB |
1351 | SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); |
1352 | SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid)); | |
c69e8d9c | 1353 | rcu_read_unlock(); |
1da177e4 LT |
1354 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1355 | ||
1356 | return 0; | |
1357 | } | |
1358 | ||
3aba481f RM |
1359 | static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm) |
1360 | { | |
1361 | elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv; | |
1362 | int i = 0; | |
1363 | do | |
1364 | i += 2; | |
1365 | while (auxv[i - 2] != AT_NULL); | |
1366 | fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv); | |
1367 | } | |
1368 | ||
49ae4d4b | 1369 | static void fill_siginfo_note(struct memelfnote *note, user_siginfo_t *csigdata, |
ce395960 | 1370 | const siginfo_t *siginfo) |
49ae4d4b DV |
1371 | { |
1372 | mm_segment_t old_fs = get_fs(); | |
1373 | set_fs(KERNEL_DS); | |
1374 | copy_siginfo_to_user((user_siginfo_t __user *) csigdata, siginfo); | |
1375 | set_fs(old_fs); | |
1376 | fill_note(note, "CORE", NT_SIGINFO, sizeof(*csigdata), csigdata); | |
1377 | } | |
1378 | ||
2aa362c4 DV |
1379 | #define MAX_FILE_NOTE_SIZE (4*1024*1024) |
1380 | /* | |
1381 | * Format of NT_FILE note: | |
1382 | * | |
1383 | * long count -- how many files are mapped | |
1384 | * long page_size -- units for file_ofs | |
1385 | * array of [COUNT] elements of | |
1386 | * long start | |
1387 | * long end | |
1388 | * long file_ofs | |
1389 | * followed by COUNT filenames in ASCII: "FILE1" NUL "FILE2" NUL... | |
1390 | */ | |
72023656 | 1391 | static int fill_files_note(struct memelfnote *note) |
2aa362c4 DV |
1392 | { |
1393 | struct vm_area_struct *vma; | |
1394 | unsigned count, size, names_ofs, remaining, n; | |
1395 | user_long_t *data; | |
1396 | user_long_t *start_end_ofs; | |
1397 | char *name_base, *name_curpos; | |
1398 | ||
1399 | /* *Estimated* file count and total data size needed */ | |
1400 | count = current->mm->map_count; | |
1401 | size = count * 64; | |
1402 | ||
1403 | names_ofs = (2 + 3 * count) * sizeof(data[0]); | |
1404 | alloc: | |
1405 | if (size >= MAX_FILE_NOTE_SIZE) /* paranoia check */ | |
72023656 | 1406 | return -EINVAL; |
2aa362c4 DV |
1407 | size = round_up(size, PAGE_SIZE); |
1408 | data = vmalloc(size); | |
1409 | if (!data) | |
72023656 | 1410 | return -ENOMEM; |
2aa362c4 DV |
1411 | |
1412 | start_end_ofs = data + 2; | |
1413 | name_base = name_curpos = ((char *)data) + names_ofs; | |
1414 | remaining = size - names_ofs; | |
1415 | count = 0; | |
1416 | for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) { | |
1417 | struct file *file; | |
1418 | const char *filename; | |
1419 | ||
1420 | file = vma->vm_file; | |
1421 | if (!file) | |
1422 | continue; | |
1423 | filename = d_path(&file->f_path, name_curpos, remaining); | |
1424 | if (IS_ERR(filename)) { | |
1425 | if (PTR_ERR(filename) == -ENAMETOOLONG) { | |
1426 | vfree(data); | |
1427 | size = size * 5 / 4; | |
1428 | goto alloc; | |
1429 | } | |
1430 | continue; | |
1431 | } | |
1432 | ||
1433 | /* d_path() fills at the end, move name down */ | |
1434 | /* n = strlen(filename) + 1: */ | |
1435 | n = (name_curpos + remaining) - filename; | |
1436 | remaining = filename - name_curpos; | |
1437 | memmove(name_curpos, filename, n); | |
1438 | name_curpos += n; | |
1439 | ||
1440 | *start_end_ofs++ = vma->vm_start; | |
1441 | *start_end_ofs++ = vma->vm_end; | |
1442 | *start_end_ofs++ = vma->vm_pgoff; | |
1443 | count++; | |
1444 | } | |
1445 | ||
1446 | /* Now we know exact count of files, can store it */ | |
1447 | data[0] = count; | |
1448 | data[1] = PAGE_SIZE; | |
1449 | /* | |
1450 | * Count usually is less than current->mm->map_count, | |
1451 | * we need to move filenames down. | |
1452 | */ | |
1453 | n = current->mm->map_count - count; | |
1454 | if (n != 0) { | |
1455 | unsigned shift_bytes = n * 3 * sizeof(data[0]); | |
1456 | memmove(name_base - shift_bytes, name_base, | |
1457 | name_curpos - name_base); | |
1458 | name_curpos -= shift_bytes; | |
1459 | } | |
1460 | ||
1461 | size = name_curpos - (char *)data; | |
1462 | fill_note(note, "CORE", NT_FILE, size, data); | |
72023656 | 1463 | return 0; |
2aa362c4 DV |
1464 | } |
1465 | ||
4206d3aa RM |
1466 | #ifdef CORE_DUMP_USE_REGSET |
1467 | #include <linux/regset.h> | |
1468 | ||
1469 | struct elf_thread_core_info { | |
1470 | struct elf_thread_core_info *next; | |
1471 | struct task_struct *task; | |
1472 | struct elf_prstatus prstatus; | |
1473 | struct memelfnote notes[0]; | |
1474 | }; | |
1475 | ||
1476 | struct elf_note_info { | |
1477 | struct elf_thread_core_info *thread; | |
1478 | struct memelfnote psinfo; | |
49ae4d4b | 1479 | struct memelfnote signote; |
4206d3aa | 1480 | struct memelfnote auxv; |
2aa362c4 | 1481 | struct memelfnote files; |
49ae4d4b | 1482 | user_siginfo_t csigdata; |
4206d3aa RM |
1483 | size_t size; |
1484 | int thread_notes; | |
1485 | }; | |
1486 | ||
d31472b6 RM |
1487 | /* |
1488 | * When a regset has a writeback hook, we call it on each thread before | |
1489 | * dumping user memory. On register window machines, this makes sure the | |
1490 | * user memory backing the register data is up to date before we read it. | |
1491 | */ | |
1492 | static void do_thread_regset_writeback(struct task_struct *task, | |
1493 | const struct user_regset *regset) | |
1494 | { | |
1495 | if (regset->writeback) | |
1496 | regset->writeback(task, regset, 1); | |
1497 | } | |
1498 | ||
0953f65d L |
1499 | #ifndef PR_REG_SIZE |
1500 | #define PR_REG_SIZE(S) sizeof(S) | |
1501 | #endif | |
1502 | ||
1503 | #ifndef PRSTATUS_SIZE | |
1504 | #define PRSTATUS_SIZE(S) sizeof(S) | |
1505 | #endif | |
1506 | ||
1507 | #ifndef PR_REG_PTR | |
1508 | #define PR_REG_PTR(S) (&((S)->pr_reg)) | |
1509 | #endif | |
1510 | ||
1511 | #ifndef SET_PR_FPVALID | |
1512 | #define SET_PR_FPVALID(S, V) ((S)->pr_fpvalid = (V)) | |
1513 | #endif | |
1514 | ||
4206d3aa RM |
1515 | static int fill_thread_core_info(struct elf_thread_core_info *t, |
1516 | const struct user_regset_view *view, | |
1517 | long signr, size_t *total) | |
1518 | { | |
1519 | unsigned int i; | |
1520 | ||
1521 | /* | |
1522 | * NT_PRSTATUS is the one special case, because the regset data | |
1523 | * goes into the pr_reg field inside the note contents, rather | |
1524 | * than being the whole note contents. We fill the reset in here. | |
1525 | * We assume that regset 0 is NT_PRSTATUS. | |
1526 | */ | |
1527 | fill_prstatus(&t->prstatus, t->task, signr); | |
1528 | (void) view->regsets[0].get(t->task, &view->regsets[0], | |
0953f65d L |
1529 | 0, PR_REG_SIZE(t->prstatus.pr_reg), |
1530 | PR_REG_PTR(&t->prstatus), NULL); | |
4206d3aa RM |
1531 | |
1532 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, | |
0953f65d | 1533 | PRSTATUS_SIZE(t->prstatus), &t->prstatus); |
4206d3aa RM |
1534 | *total += notesize(&t->notes[0]); |
1535 | ||
d31472b6 RM |
1536 | do_thread_regset_writeback(t->task, &view->regsets[0]); |
1537 | ||
4206d3aa RM |
1538 | /* |
1539 | * Each other regset might generate a note too. For each regset | |
1540 | * that has no core_note_type or is inactive, we leave t->notes[i] | |
1541 | * all zero and we'll know to skip writing it later. | |
1542 | */ | |
1543 | for (i = 1; i < view->n; ++i) { | |
1544 | const struct user_regset *regset = &view->regsets[i]; | |
d31472b6 | 1545 | do_thread_regset_writeback(t->task, regset); |
c8e25258 | 1546 | if (regset->core_note_type && regset->get && |
4206d3aa RM |
1547 | (!regset->active || regset->active(t->task, regset))) { |
1548 | int ret; | |
1549 | size_t size = regset->n * regset->size; | |
1550 | void *data = kmalloc(size, GFP_KERNEL); | |
1551 | if (unlikely(!data)) | |
1552 | return 0; | |
1553 | ret = regset->get(t->task, regset, | |
1554 | 0, size, data, NULL); | |
1555 | if (unlikely(ret)) | |
1556 | kfree(data); | |
1557 | else { | |
1558 | if (regset->core_note_type != NT_PRFPREG) | |
1559 | fill_note(&t->notes[i], "LINUX", | |
1560 | regset->core_note_type, | |
1561 | size, data); | |
1562 | else { | |
0953f65d | 1563 | SET_PR_FPVALID(&t->prstatus, 1); |
4206d3aa RM |
1564 | fill_note(&t->notes[i], "CORE", |
1565 | NT_PRFPREG, size, data); | |
1566 | } | |
1567 | *total += notesize(&t->notes[i]); | |
1568 | } | |
1569 | } | |
1570 | } | |
1571 | ||
1572 | return 1; | |
1573 | } | |
1574 | ||
1575 | static int fill_note_info(struct elfhdr *elf, int phdrs, | |
1576 | struct elf_note_info *info, | |
ec57941e | 1577 | const siginfo_t *siginfo, struct pt_regs *regs) |
4206d3aa RM |
1578 | { |
1579 | struct task_struct *dump_task = current; | |
1580 | const struct user_regset_view *view = task_user_regset_view(dump_task); | |
1581 | struct elf_thread_core_info *t; | |
1582 | struct elf_prpsinfo *psinfo; | |
83914441 | 1583 | struct core_thread *ct; |
4206d3aa RM |
1584 | unsigned int i; |
1585 | ||
1586 | info->size = 0; | |
1587 | info->thread = NULL; | |
1588 | ||
1589 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
6899e92d AC |
1590 | if (psinfo == NULL) { |
1591 | info->psinfo.data = NULL; /* So we don't free this wrongly */ | |
4206d3aa | 1592 | return 0; |
6899e92d | 1593 | } |
4206d3aa | 1594 | |
e2dbe125 AW |
1595 | fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
1596 | ||
4206d3aa RM |
1597 | /* |
1598 | * Figure out how many notes we're going to need for each thread. | |
1599 | */ | |
1600 | info->thread_notes = 0; | |
1601 | for (i = 0; i < view->n; ++i) | |
1602 | if (view->regsets[i].core_note_type != 0) | |
1603 | ++info->thread_notes; | |
1604 | ||
1605 | /* | |
1606 | * Sanity check. We rely on regset 0 being in NT_PRSTATUS, | |
1607 | * since it is our one special case. | |
1608 | */ | |
1609 | if (unlikely(info->thread_notes == 0) || | |
1610 | unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) { | |
1611 | WARN_ON(1); | |
1612 | return 0; | |
1613 | } | |
1614 | ||
1615 | /* | |
1616 | * Initialize the ELF file header. | |
1617 | */ | |
1618 | fill_elf_header(elf, phdrs, | |
d3330cf0 | 1619 | view->e_machine, view->e_flags); |
4206d3aa RM |
1620 | |
1621 | /* | |
1622 | * Allocate a structure for each thread. | |
1623 | */ | |
83914441 ON |
1624 | for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) { |
1625 | t = kzalloc(offsetof(struct elf_thread_core_info, | |
1626 | notes[info->thread_notes]), | |
1627 | GFP_KERNEL); | |
1628 | if (unlikely(!t)) | |
1629 | return 0; | |
1630 | ||
1631 | t->task = ct->task; | |
1632 | if (ct->task == dump_task || !info->thread) { | |
1633 | t->next = info->thread; | |
1634 | info->thread = t; | |
1635 | } else { | |
1636 | /* | |
1637 | * Make sure to keep the original task at | |
1638 | * the head of the list. | |
1639 | */ | |
1640 | t->next = info->thread->next; | |
1641 | info->thread->next = t; | |
4206d3aa | 1642 | } |
83914441 | 1643 | } |
4206d3aa RM |
1644 | |
1645 | /* | |
1646 | * Now fill in each thread's information. | |
1647 | */ | |
1648 | for (t = info->thread; t != NULL; t = t->next) | |
5ab1c309 | 1649 | if (!fill_thread_core_info(t, view, siginfo->si_signo, &info->size)) |
4206d3aa RM |
1650 | return 0; |
1651 | ||
1652 | /* | |
1653 | * Fill in the two process-wide notes. | |
1654 | */ | |
1655 | fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm); | |
1656 | info->size += notesize(&info->psinfo); | |
1657 | ||
49ae4d4b DV |
1658 | fill_siginfo_note(&info->signote, &info->csigdata, siginfo); |
1659 | info->size += notesize(&info->signote); | |
1660 | ||
4206d3aa RM |
1661 | fill_auxv_note(&info->auxv, current->mm); |
1662 | info->size += notesize(&info->auxv); | |
1663 | ||
72023656 DA |
1664 | if (fill_files_note(&info->files) == 0) |
1665 | info->size += notesize(&info->files); | |
2aa362c4 | 1666 | |
4206d3aa RM |
1667 | return 1; |
1668 | } | |
1669 | ||
1670 | static size_t get_note_info_size(struct elf_note_info *info) | |
1671 | { | |
1672 | return info->size; | |
1673 | } | |
1674 | ||
1675 | /* | |
1676 | * Write all the notes for each thread. When writing the first thread, the | |
1677 | * process-wide notes are interleaved after the first thread-specific note. | |
1678 | */ | |
1679 | static int write_note_info(struct elf_note_info *info, | |
ecc8c772 | 1680 | struct coredump_params *cprm) |
4206d3aa | 1681 | { |
b219e25f | 1682 | bool first = true; |
4206d3aa RM |
1683 | struct elf_thread_core_info *t = info->thread; |
1684 | ||
1685 | do { | |
1686 | int i; | |
1687 | ||
ecc8c772 | 1688 | if (!writenote(&t->notes[0], cprm)) |
4206d3aa RM |
1689 | return 0; |
1690 | ||
ecc8c772 | 1691 | if (first && !writenote(&info->psinfo, cprm)) |
4206d3aa | 1692 | return 0; |
ecc8c772 | 1693 | if (first && !writenote(&info->signote, cprm)) |
49ae4d4b | 1694 | return 0; |
ecc8c772 | 1695 | if (first && !writenote(&info->auxv, cprm)) |
4206d3aa | 1696 | return 0; |
72023656 | 1697 | if (first && info->files.data && |
ecc8c772 | 1698 | !writenote(&info->files, cprm)) |
2aa362c4 | 1699 | return 0; |
4206d3aa RM |
1700 | |
1701 | for (i = 1; i < info->thread_notes; ++i) | |
1702 | if (t->notes[i].data && | |
ecc8c772 | 1703 | !writenote(&t->notes[i], cprm)) |
4206d3aa RM |
1704 | return 0; |
1705 | ||
b219e25f | 1706 | first = false; |
4206d3aa RM |
1707 | t = t->next; |
1708 | } while (t); | |
1709 | ||
1710 | return 1; | |
1711 | } | |
1712 | ||
1713 | static void free_note_info(struct elf_note_info *info) | |
1714 | { | |
1715 | struct elf_thread_core_info *threads = info->thread; | |
1716 | while (threads) { | |
1717 | unsigned int i; | |
1718 | struct elf_thread_core_info *t = threads; | |
1719 | threads = t->next; | |
1720 | WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus); | |
1721 | for (i = 1; i < info->thread_notes; ++i) | |
1722 | kfree(t->notes[i].data); | |
1723 | kfree(t); | |
1724 | } | |
1725 | kfree(info->psinfo.data); | |
2aa362c4 | 1726 | vfree(info->files.data); |
4206d3aa RM |
1727 | } |
1728 | ||
1729 | #else | |
1730 | ||
1da177e4 LT |
1731 | /* Here is the structure in which status of each thread is captured. */ |
1732 | struct elf_thread_status | |
1733 | { | |
1734 | struct list_head list; | |
1735 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1736 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1737 | struct task_struct *thread; | |
1738 | #ifdef ELF_CORE_COPY_XFPREGS | |
5b20cd80 | 1739 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
1da177e4 LT |
1740 | #endif |
1741 | struct memelfnote notes[3]; | |
1742 | int num_notes; | |
1743 | }; | |
1744 | ||
1745 | /* | |
1746 | * In order to add the specific thread information for the elf file format, | |
f4e5cc2c JJ |
1747 | * we need to keep a linked list of every threads pr_status and then create |
1748 | * a single section for them in the final core file. | |
1da177e4 LT |
1749 | */ |
1750 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1751 | { | |
1752 | int sz = 0; | |
1753 | struct task_struct *p = t->thread; | |
1754 | t->num_notes = 0; | |
1755 | ||
1756 | fill_prstatus(&t->prstatus, p, signr); | |
1757 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1758 | ||
f4e5cc2c JJ |
1759 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
1760 | &(t->prstatus)); | |
1da177e4 LT |
1761 | t->num_notes++; |
1762 | sz += notesize(&t->notes[0]); | |
1763 | ||
f4e5cc2c JJ |
1764 | if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, |
1765 | &t->fpu))) { | |
1766 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1767 | &(t->fpu)); | |
1da177e4 LT |
1768 | t->num_notes++; |
1769 | sz += notesize(&t->notes[1]); | |
1770 | } | |
1771 | ||
1772 | #ifdef ELF_CORE_COPY_XFPREGS | |
1773 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
5b20cd80 MN |
1774 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1775 | sizeof(t->xfpu), &t->xfpu); | |
1da177e4 LT |
1776 | t->num_notes++; |
1777 | sz += notesize(&t->notes[2]); | |
1778 | } | |
1779 | #endif | |
1780 | return sz; | |
1781 | } | |
1782 | ||
3aba481f RM |
1783 | struct elf_note_info { |
1784 | struct memelfnote *notes; | |
72023656 | 1785 | struct memelfnote *notes_files; |
3aba481f RM |
1786 | struct elf_prstatus *prstatus; /* NT_PRSTATUS */ |
1787 | struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */ | |
1788 | struct list_head thread_list; | |
1789 | elf_fpregset_t *fpu; | |
1790 | #ifdef ELF_CORE_COPY_XFPREGS | |
1791 | elf_fpxregset_t *xfpu; | |
1792 | #endif | |
49ae4d4b | 1793 | user_siginfo_t csigdata; |
3aba481f RM |
1794 | int thread_status_size; |
1795 | int numnote; | |
1796 | }; | |
1797 | ||
0cf062d0 | 1798 | static int elf_note_info_init(struct elf_note_info *info) |
3aba481f | 1799 | { |
0cf062d0 | 1800 | memset(info, 0, sizeof(*info)); |
3aba481f RM |
1801 | INIT_LIST_HEAD(&info->thread_list); |
1802 | ||
49ae4d4b | 1803 | /* Allocate space for ELF notes */ |
2aa362c4 | 1804 | info->notes = kmalloc(8 * sizeof(struct memelfnote), GFP_KERNEL); |
3aba481f RM |
1805 | if (!info->notes) |
1806 | return 0; | |
1807 | info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL); | |
1808 | if (!info->psinfo) | |
f34f9d18 | 1809 | return 0; |
3aba481f RM |
1810 | info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL); |
1811 | if (!info->prstatus) | |
f34f9d18 | 1812 | return 0; |
3aba481f RM |
1813 | info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL); |
1814 | if (!info->fpu) | |
f34f9d18 | 1815 | return 0; |
3aba481f RM |
1816 | #ifdef ELF_CORE_COPY_XFPREGS |
1817 | info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL); | |
1818 | if (!info->xfpu) | |
f34f9d18 | 1819 | return 0; |
3aba481f | 1820 | #endif |
0cf062d0 | 1821 | return 1; |
0cf062d0 AW |
1822 | } |
1823 | ||
1824 | static int fill_note_info(struct elfhdr *elf, int phdrs, | |
1825 | struct elf_note_info *info, | |
ec57941e | 1826 | const siginfo_t *siginfo, struct pt_regs *regs) |
0cf062d0 AW |
1827 | { |
1828 | struct list_head *t; | |
afabada9 AV |
1829 | struct core_thread *ct; |
1830 | struct elf_thread_status *ets; | |
0cf062d0 AW |
1831 | |
1832 | if (!elf_note_info_init(info)) | |
1833 | return 0; | |
3aba481f | 1834 | |
afabada9 AV |
1835 | for (ct = current->mm->core_state->dumper.next; |
1836 | ct; ct = ct->next) { | |
1837 | ets = kzalloc(sizeof(*ets), GFP_KERNEL); | |
1838 | if (!ets) | |
1839 | return 0; | |
83914441 | 1840 | |
afabada9 AV |
1841 | ets->thread = ct->task; |
1842 | list_add(&ets->list, &info->thread_list); | |
1843 | } | |
83914441 | 1844 | |
afabada9 AV |
1845 | list_for_each(t, &info->thread_list) { |
1846 | int sz; | |
3aba481f | 1847 | |
afabada9 AV |
1848 | ets = list_entry(t, struct elf_thread_status, list); |
1849 | sz = elf_dump_thread_status(siginfo->si_signo, ets); | |
1850 | info->thread_status_size += sz; | |
3aba481f RM |
1851 | } |
1852 | /* now collect the dump for the current */ | |
1853 | memset(info->prstatus, 0, sizeof(*info->prstatus)); | |
5ab1c309 | 1854 | fill_prstatus(info->prstatus, current, siginfo->si_signo); |
3aba481f RM |
1855 | elf_core_copy_regs(&info->prstatus->pr_reg, regs); |
1856 | ||
1857 | /* Set up header */ | |
d3330cf0 | 1858 | fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS); |
3aba481f RM |
1859 | |
1860 | /* | |
1861 | * Set up the notes in similar form to SVR4 core dumps made | |
1862 | * with info from their /proc. | |
1863 | */ | |
1864 | ||
1865 | fill_note(info->notes + 0, "CORE", NT_PRSTATUS, | |
1866 | sizeof(*info->prstatus), info->prstatus); | |
1867 | fill_psinfo(info->psinfo, current->group_leader, current->mm); | |
1868 | fill_note(info->notes + 1, "CORE", NT_PRPSINFO, | |
1869 | sizeof(*info->psinfo), info->psinfo); | |
1870 | ||
2aa362c4 DV |
1871 | fill_siginfo_note(info->notes + 2, &info->csigdata, siginfo); |
1872 | fill_auxv_note(info->notes + 3, current->mm); | |
72023656 | 1873 | info->numnote = 4; |
3aba481f | 1874 | |
72023656 DA |
1875 | if (fill_files_note(info->notes + info->numnote) == 0) { |
1876 | info->notes_files = info->notes + info->numnote; | |
1877 | info->numnote++; | |
1878 | } | |
3aba481f RM |
1879 | |
1880 | /* Try to dump the FPU. */ | |
1881 | info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs, | |
1882 | info->fpu); | |
1883 | if (info->prstatus->pr_fpvalid) | |
1884 | fill_note(info->notes + info->numnote++, | |
1885 | "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu); | |
1886 | #ifdef ELF_CORE_COPY_XFPREGS | |
1887 | if (elf_core_copy_task_xfpregs(current, info->xfpu)) | |
1888 | fill_note(info->notes + info->numnote++, | |
1889 | "LINUX", ELF_CORE_XFPREG_TYPE, | |
1890 | sizeof(*info->xfpu), info->xfpu); | |
1891 | #endif | |
1892 | ||
1893 | return 1; | |
3aba481f RM |
1894 | } |
1895 | ||
1896 | static size_t get_note_info_size(struct elf_note_info *info) | |
1897 | { | |
1898 | int sz = 0; | |
1899 | int i; | |
1900 | ||
1901 | for (i = 0; i < info->numnote; i++) | |
1902 | sz += notesize(info->notes + i); | |
1903 | ||
1904 | sz += info->thread_status_size; | |
1905 | ||
1906 | return sz; | |
1907 | } | |
1908 | ||
1909 | static int write_note_info(struct elf_note_info *info, | |
ecc8c772 | 1910 | struct coredump_params *cprm) |
3aba481f RM |
1911 | { |
1912 | int i; | |
1913 | struct list_head *t; | |
1914 | ||
1915 | for (i = 0; i < info->numnote; i++) | |
ecc8c772 | 1916 | if (!writenote(info->notes + i, cprm)) |
3aba481f RM |
1917 | return 0; |
1918 | ||
1919 | /* write out the thread status notes section */ | |
1920 | list_for_each(t, &info->thread_list) { | |
1921 | struct elf_thread_status *tmp = | |
1922 | list_entry(t, struct elf_thread_status, list); | |
1923 | ||
1924 | for (i = 0; i < tmp->num_notes; i++) | |
ecc8c772 | 1925 | if (!writenote(&tmp->notes[i], cprm)) |
3aba481f RM |
1926 | return 0; |
1927 | } | |
1928 | ||
1929 | return 1; | |
1930 | } | |
1931 | ||
1932 | static void free_note_info(struct elf_note_info *info) | |
1933 | { | |
1934 | while (!list_empty(&info->thread_list)) { | |
1935 | struct list_head *tmp = info->thread_list.next; | |
1936 | list_del(tmp); | |
1937 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
1938 | } | |
1939 | ||
72023656 DA |
1940 | /* Free data possibly allocated by fill_files_note(): */ |
1941 | if (info->notes_files) | |
1942 | vfree(info->notes_files->data); | |
2aa362c4 | 1943 | |
3aba481f RM |
1944 | kfree(info->prstatus); |
1945 | kfree(info->psinfo); | |
1946 | kfree(info->notes); | |
1947 | kfree(info->fpu); | |
1948 | #ifdef ELF_CORE_COPY_XFPREGS | |
1949 | kfree(info->xfpu); | |
1950 | #endif | |
1951 | } | |
1952 | ||
4206d3aa RM |
1953 | #endif |
1954 | ||
f47aef55 RM |
1955 | static struct vm_area_struct *first_vma(struct task_struct *tsk, |
1956 | struct vm_area_struct *gate_vma) | |
1957 | { | |
1958 | struct vm_area_struct *ret = tsk->mm->mmap; | |
1959 | ||
1960 | if (ret) | |
1961 | return ret; | |
1962 | return gate_vma; | |
1963 | } | |
1964 | /* | |
1965 | * Helper function for iterating across a vma list. It ensures that the caller | |
1966 | * will visit `gate_vma' prior to terminating the search. | |
1967 | */ | |
1968 | static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma, | |
1969 | struct vm_area_struct *gate_vma) | |
1970 | { | |
1971 | struct vm_area_struct *ret; | |
1972 | ||
1973 | ret = this_vma->vm_next; | |
1974 | if (ret) | |
1975 | return ret; | |
1976 | if (this_vma == gate_vma) | |
1977 | return NULL; | |
1978 | return gate_vma; | |
1979 | } | |
1980 | ||
8d9032bb DH |
1981 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
1982 | elf_addr_t e_shoff, int segs) | |
1983 | { | |
1984 | elf->e_shoff = e_shoff; | |
1985 | elf->e_shentsize = sizeof(*shdr4extnum); | |
1986 | elf->e_shnum = 1; | |
1987 | elf->e_shstrndx = SHN_UNDEF; | |
1988 | ||
1989 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); | |
1990 | ||
1991 | shdr4extnum->sh_type = SHT_NULL; | |
1992 | shdr4extnum->sh_size = elf->e_shnum; | |
1993 | shdr4extnum->sh_link = elf->e_shstrndx; | |
1994 | shdr4extnum->sh_info = segs; | |
1995 | } | |
1996 | ||
1997 | static size_t elf_core_vma_data_size(struct vm_area_struct *gate_vma, | |
1998 | unsigned long mm_flags) | |
1999 | { | |
2000 | struct vm_area_struct *vma; | |
2001 | size_t size = 0; | |
2002 | ||
2003 | for (vma = first_vma(current, gate_vma); vma != NULL; | |
2004 | vma = next_vma(vma, gate_vma)) | |
2005 | size += vma_dump_size(vma, mm_flags); | |
2006 | return size; | |
2007 | } | |
2008 | ||
1da177e4 LT |
2009 | /* |
2010 | * Actual dumper | |
2011 | * | |
2012 | * This is a two-pass process; first we find the offsets of the bits, | |
2013 | * and then they are actually written out. If we run out of core limit | |
2014 | * we just truncate. | |
2015 | */ | |
f6151dfe | 2016 | static int elf_core_dump(struct coredump_params *cprm) |
1da177e4 | 2017 | { |
1da177e4 LT |
2018 | int has_dumped = 0; |
2019 | mm_segment_t fs; | |
2020 | int segs; | |
f47aef55 | 2021 | struct vm_area_struct *vma, *gate_vma; |
1da177e4 | 2022 | struct elfhdr *elf = NULL; |
cdc3d562 | 2023 | loff_t offset = 0, dataoff; |
72023656 | 2024 | struct elf_note_info info = { }; |
93eb211e | 2025 | struct elf_phdr *phdr4note = NULL; |
8d9032bb DH |
2026 | struct elf_shdr *shdr4extnum = NULL; |
2027 | Elf_Half e_phnum; | |
2028 | elf_addr_t e_shoff; | |
1da177e4 LT |
2029 | |
2030 | /* | |
2031 | * We no longer stop all VM operations. | |
2032 | * | |
f4e5cc2c JJ |
2033 | * This is because those proceses that could possibly change map_count |
2034 | * or the mmap / vma pages are now blocked in do_exit on current | |
2035 | * finishing this core dump. | |
1da177e4 LT |
2036 | * |
2037 | * Only ptrace can touch these memory addresses, but it doesn't change | |
f4e5cc2c | 2038 | * the map_count or the pages allocated. So no possibility of crashing |
1da177e4 LT |
2039 | * exists while dumping the mm->vm_next areas to the core file. |
2040 | */ | |
2041 | ||
2042 | /* alloc memory for large data structures: too large to be on stack */ | |
2043 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
2044 | if (!elf) | |
5f719558 | 2045 | goto out; |
341c87bf KH |
2046 | /* |
2047 | * The number of segs are recored into ELF header as 16bit value. | |
2048 | * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here. | |
2049 | */ | |
1da177e4 | 2050 | segs = current->mm->map_count; |
1fcccbac | 2051 | segs += elf_core_extra_phdrs(); |
1da177e4 | 2052 | |
31db58b3 | 2053 | gate_vma = get_gate_vma(current->mm); |
f47aef55 RM |
2054 | if (gate_vma != NULL) |
2055 | segs++; | |
2056 | ||
8d9032bb DH |
2057 | /* for notes section */ |
2058 | segs++; | |
2059 | ||
2060 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid | |
2061 | * this, kernel supports extended numbering. Have a look at | |
2062 | * include/linux/elf.h for further information. */ | |
2063 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; | |
2064 | ||
1da177e4 | 2065 | /* |
3aba481f RM |
2066 | * Collect all the non-memory information about the process for the |
2067 | * notes. This also sets up the file header. | |
1da177e4 | 2068 | */ |
5ab1c309 | 2069 | if (!fill_note_info(elf, e_phnum, &info, cprm->siginfo, cprm->regs)) |
3aba481f | 2070 | goto cleanup; |
1da177e4 | 2071 | |
3aba481f | 2072 | has_dumped = 1; |
079148b9 | 2073 | |
1da177e4 LT |
2074 | fs = get_fs(); |
2075 | set_fs(KERNEL_DS); | |
2076 | ||
1da177e4 | 2077 | offset += sizeof(*elf); /* Elf header */ |
8d9032bb | 2078 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
1da177e4 LT |
2079 | |
2080 | /* Write notes phdr entry */ | |
2081 | { | |
3aba481f | 2082 | size_t sz = get_note_info_size(&info); |
1da177e4 | 2083 | |
e5501492 | 2084 | sz += elf_coredump_extra_notes_size(); |
bf1ab978 | 2085 | |
93eb211e DH |
2086 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
2087 | if (!phdr4note) | |
088e7af7 | 2088 | goto end_coredump; |
93eb211e DH |
2089 | |
2090 | fill_elf_note_phdr(phdr4note, sz, offset); | |
2091 | offset += sz; | |
1da177e4 LT |
2092 | } |
2093 | ||
1da177e4 LT |
2094 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
2095 | ||
30736a4d | 2096 | offset += elf_core_vma_data_size(gate_vma, cprm->mm_flags); |
8d9032bb DH |
2097 | offset += elf_core_extra_data_size(); |
2098 | e_shoff = offset; | |
2099 | ||
2100 | if (e_phnum == PN_XNUM) { | |
2101 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); | |
2102 | if (!shdr4extnum) | |
2103 | goto end_coredump; | |
2104 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs); | |
2105 | } | |
2106 | ||
2107 | offset = dataoff; | |
2108 | ||
ecc8c772 | 2109 | if (!dump_emit(cprm, elf, sizeof(*elf))) |
93eb211e DH |
2110 | goto end_coredump; |
2111 | ||
ecc8c772 | 2112 | if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) |
93eb211e DH |
2113 | goto end_coredump; |
2114 | ||
1da177e4 | 2115 | /* Write program headers for segments dump */ |
f47aef55 RM |
2116 | for (vma = first_vma(current, gate_vma); vma != NULL; |
2117 | vma = next_vma(vma, gate_vma)) { | |
1da177e4 | 2118 | struct elf_phdr phdr; |
1da177e4 LT |
2119 | |
2120 | phdr.p_type = PT_LOAD; | |
2121 | phdr.p_offset = offset; | |
2122 | phdr.p_vaddr = vma->vm_start; | |
2123 | phdr.p_paddr = 0; | |
30736a4d | 2124 | phdr.p_filesz = vma_dump_size(vma, cprm->mm_flags); |
82df3973 | 2125 | phdr.p_memsz = vma->vm_end - vma->vm_start; |
1da177e4 LT |
2126 | offset += phdr.p_filesz; |
2127 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
f4e5cc2c JJ |
2128 | if (vma->vm_flags & VM_WRITE) |
2129 | phdr.p_flags |= PF_W; | |
2130 | if (vma->vm_flags & VM_EXEC) | |
2131 | phdr.p_flags |= PF_X; | |
1da177e4 LT |
2132 | phdr.p_align = ELF_EXEC_PAGESIZE; |
2133 | ||
ecc8c772 | 2134 | if (!dump_emit(cprm, &phdr, sizeof(phdr))) |
088e7af7 | 2135 | goto end_coredump; |
1da177e4 LT |
2136 | } |
2137 | ||
506f21c5 | 2138 | if (!elf_core_write_extra_phdrs(cprm, offset)) |
1fcccbac | 2139 | goto end_coredump; |
1da177e4 LT |
2140 | |
2141 | /* write out the notes section */ | |
ecc8c772 | 2142 | if (!write_note_info(&info, cprm)) |
3aba481f | 2143 | goto end_coredump; |
1da177e4 | 2144 | |
cdc3d562 | 2145 | if (elf_coredump_extra_notes_write(cprm)) |
e5501492 | 2146 | goto end_coredump; |
bf1ab978 | 2147 | |
d025c9db | 2148 | /* Align to page */ |
9b56d543 | 2149 | if (!dump_skip(cprm, dataoff - cprm->written)) |
f3e8fccd | 2150 | goto end_coredump; |
1da177e4 | 2151 | |
f47aef55 RM |
2152 | for (vma = first_vma(current, gate_vma); vma != NULL; |
2153 | vma = next_vma(vma, gate_vma)) { | |
1da177e4 | 2154 | unsigned long addr; |
82df3973 | 2155 | unsigned long end; |
1da177e4 | 2156 | |
30736a4d | 2157 | end = vma->vm_start + vma_dump_size(vma, cprm->mm_flags); |
1da177e4 | 2158 | |
82df3973 | 2159 | for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) { |
f4e5cc2c | 2160 | struct page *page; |
f3e8fccd HD |
2161 | int stop; |
2162 | ||
2163 | page = get_dump_page(addr); | |
2164 | if (page) { | |
2165 | void *kaddr = kmap(page); | |
13046ece | 2166 | stop = !dump_emit(cprm, kaddr, PAGE_SIZE); |
f3e8fccd | 2167 | kunmap(page); |
1da177e4 | 2168 | page_cache_release(page); |
f3e8fccd | 2169 | } else |
9b56d543 | 2170 | stop = !dump_skip(cprm, PAGE_SIZE); |
f3e8fccd HD |
2171 | if (stop) |
2172 | goto end_coredump; | |
1da177e4 LT |
2173 | } |
2174 | } | |
2175 | ||
aa3e7eaf | 2176 | if (!elf_core_write_extra_data(cprm)) |
1fcccbac | 2177 | goto end_coredump; |
1da177e4 | 2178 | |
8d9032bb | 2179 | if (e_phnum == PN_XNUM) { |
13046ece | 2180 | if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) |
8d9032bb DH |
2181 | goto end_coredump; |
2182 | } | |
2183 | ||
1da177e4 LT |
2184 | end_coredump: |
2185 | set_fs(fs); | |
2186 | ||
2187 | cleanup: | |
3aba481f | 2188 | free_note_info(&info); |
8d9032bb | 2189 | kfree(shdr4extnum); |
93eb211e | 2190 | kfree(phdr4note); |
5f719558 WC |
2191 | kfree(elf); |
2192 | out: | |
1da177e4 | 2193 | return has_dumped; |
1da177e4 LT |
2194 | } |
2195 | ||
698ba7b5 | 2196 | #endif /* CONFIG_ELF_CORE */ |
1da177e4 LT |
2197 | |
2198 | static int __init init_elf_binfmt(void) | |
2199 | { | |
8fc3dc5a AV |
2200 | register_binfmt(&elf_format); |
2201 | return 0; | |
1da177e4 LT |
2202 | } |
2203 | ||
2204 | static void __exit exit_elf_binfmt(void) | |
2205 | { | |
2206 | /* Remove the COFF and ELF loaders. */ | |
2207 | unregister_binfmt(&elf_format); | |
2208 | } | |
2209 | ||
2210 | core_initcall(init_elf_binfmt); | |
2211 | module_exit(exit_elf_binfmt); | |
2212 | MODULE_LICENSE("GPL"); |