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> | |
30 | #include <linux/security.h> | |
1da177e4 | 31 | #include <linux/random.h> |
f4e5cc2c | 32 | #include <linux/elf.h> |
7e80d0d0 | 33 | #include <linux/utsname.h> |
088e7af7 | 34 | #include <linux/coredump.h> |
1da177e4 LT |
35 | #include <asm/uaccess.h> |
36 | #include <asm/param.h> | |
37 | #include <asm/page.h> | |
96f951ed | 38 | #include <asm/exec.h> |
1da177e4 | 39 | |
f4e5cc2c JJ |
40 | static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs); |
41 | static int load_elf_library(struct file *); | |
bb1ad820 AM |
42 | static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *, |
43 | int, int, unsigned long); | |
1da177e4 | 44 | |
1da177e4 LT |
45 | /* |
46 | * If we don't support core dumping, then supply a NULL so we | |
47 | * don't even try. | |
48 | */ | |
698ba7b5 | 49 | #ifdef CONFIG_ELF_CORE |
f6151dfe | 50 | static int elf_core_dump(struct coredump_params *cprm); |
1da177e4 LT |
51 | #else |
52 | #define elf_core_dump NULL | |
53 | #endif | |
54 | ||
55 | #if ELF_EXEC_PAGESIZE > PAGE_SIZE | |
f4e5cc2c | 56 | #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE |
1da177e4 | 57 | #else |
f4e5cc2c | 58 | #define ELF_MIN_ALIGN PAGE_SIZE |
1da177e4 LT |
59 | #endif |
60 | ||
61 | #ifndef ELF_CORE_EFLAGS | |
62 | #define ELF_CORE_EFLAGS 0 | |
63 | #endif | |
64 | ||
65 | #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1)) | |
66 | #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1)) | |
67 | #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1)) | |
68 | ||
69 | static struct linux_binfmt elf_format = { | |
f670d0ec MP |
70 | .module = THIS_MODULE, |
71 | .load_binary = load_elf_binary, | |
72 | .load_shlib = load_elf_library, | |
73 | .core_dump = elf_core_dump, | |
74 | .min_coredump = ELF_EXEC_PAGESIZE, | |
1da177e4 LT |
75 | }; |
76 | ||
d4e3cc38 | 77 | #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE) |
1da177e4 LT |
78 | |
79 | static int set_brk(unsigned long start, unsigned long end) | |
80 | { | |
81 | start = ELF_PAGEALIGN(start); | |
82 | end = ELF_PAGEALIGN(end); | |
83 | if (end > start) { | |
84 | unsigned long addr; | |
e4eb1ff6 | 85 | addr = vm_brk(start, end - start); |
1da177e4 LT |
86 | if (BAD_ADDR(addr)) |
87 | return addr; | |
88 | } | |
89 | current->mm->start_brk = current->mm->brk = end; | |
90 | return 0; | |
91 | } | |
92 | ||
1da177e4 LT |
93 | /* We need to explicitly zero any fractional pages |
94 | after the data section (i.e. bss). This would | |
95 | contain the junk from the file that should not | |
f4e5cc2c JJ |
96 | be in memory |
97 | */ | |
1da177e4 LT |
98 | static int padzero(unsigned long elf_bss) |
99 | { | |
100 | unsigned long nbyte; | |
101 | ||
102 | nbyte = ELF_PAGEOFFSET(elf_bss); | |
103 | if (nbyte) { | |
104 | nbyte = ELF_MIN_ALIGN - nbyte; | |
105 | if (clear_user((void __user *) elf_bss, nbyte)) | |
106 | return -EFAULT; | |
107 | } | |
108 | return 0; | |
109 | } | |
110 | ||
09c6dd3c | 111 | /* Let's use some macros to make this stack manipulation a little clearer */ |
1da177e4 LT |
112 | #ifdef CONFIG_STACK_GROWSUP |
113 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items)) | |
114 | #define STACK_ROUND(sp, items) \ | |
115 | ((15 + (unsigned long) ((sp) + (items))) &~ 15UL) | |
f4e5cc2c JJ |
116 | #define STACK_ALLOC(sp, len) ({ \ |
117 | elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \ | |
118 | old_sp; }) | |
1da177e4 LT |
119 | #else |
120 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items)) | |
121 | #define STACK_ROUND(sp, items) \ | |
122 | (((unsigned long) (sp - items)) &~ 15UL) | |
123 | #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; }) | |
124 | #endif | |
125 | ||
483fad1c NL |
126 | #ifndef ELF_BASE_PLATFORM |
127 | /* | |
128 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. | |
129 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value | |
130 | * will be copied to the user stack in the same manner as AT_PLATFORM. | |
131 | */ | |
132 | #define ELF_BASE_PLATFORM NULL | |
133 | #endif | |
134 | ||
1da177e4 | 135 | static int |
f4e5cc2c | 136 | create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec, |
d20894a2 | 137 | unsigned long load_addr, unsigned long interp_load_addr) |
1da177e4 LT |
138 | { |
139 | unsigned long p = bprm->p; | |
140 | int argc = bprm->argc; | |
141 | int envc = bprm->envc; | |
142 | elf_addr_t __user *argv; | |
143 | elf_addr_t __user *envp; | |
144 | elf_addr_t __user *sp; | |
145 | elf_addr_t __user *u_platform; | |
483fad1c | 146 | elf_addr_t __user *u_base_platform; |
f06295b4 | 147 | elf_addr_t __user *u_rand_bytes; |
1da177e4 | 148 | const char *k_platform = ELF_PLATFORM; |
483fad1c | 149 | const char *k_base_platform = ELF_BASE_PLATFORM; |
f06295b4 | 150 | unsigned char k_rand_bytes[16]; |
1da177e4 LT |
151 | int items; |
152 | elf_addr_t *elf_info; | |
153 | int ei_index = 0; | |
86a264ab | 154 | const struct cred *cred = current_cred(); |
b6a2fea3 | 155 | struct vm_area_struct *vma; |
1da177e4 | 156 | |
d68c9d6a FBH |
157 | /* |
158 | * In some cases (e.g. Hyper-Threading), we want to avoid L1 | |
159 | * evictions by the processes running on the same package. One | |
160 | * thing we can do is to shuffle the initial stack for them. | |
161 | */ | |
162 | ||
163 | p = arch_align_stack(p); | |
164 | ||
1da177e4 LT |
165 | /* |
166 | * If this architecture has a platform capability string, copy it | |
167 | * to userspace. In some cases (Sparc), this info is impossible | |
168 | * for userspace to get any other way, in others (i386) it is | |
169 | * merely difficult. | |
170 | */ | |
1da177e4 LT |
171 | u_platform = NULL; |
172 | if (k_platform) { | |
173 | size_t len = strlen(k_platform) + 1; | |
174 | ||
1da177e4 LT |
175 | u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); |
176 | if (__copy_to_user(u_platform, k_platform, len)) | |
177 | return -EFAULT; | |
178 | } | |
179 | ||
483fad1c NL |
180 | /* |
181 | * If this architecture has a "base" platform capability | |
182 | * string, copy it to userspace. | |
183 | */ | |
184 | u_base_platform = NULL; | |
185 | if (k_base_platform) { | |
186 | size_t len = strlen(k_base_platform) + 1; | |
187 | ||
188 | u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); | |
189 | if (__copy_to_user(u_base_platform, k_base_platform, len)) | |
190 | return -EFAULT; | |
191 | } | |
192 | ||
f06295b4 KC |
193 | /* |
194 | * Generate 16 random bytes for userspace PRNG seeding. | |
195 | */ | |
196 | get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes)); | |
197 | u_rand_bytes = (elf_addr_t __user *) | |
198 | STACK_ALLOC(p, sizeof(k_rand_bytes)); | |
199 | if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes))) | |
200 | return -EFAULT; | |
201 | ||
1da177e4 | 202 | /* Create the ELF interpreter info */ |
785d5570 | 203 | elf_info = (elf_addr_t *)current->mm->saved_auxv; |
4f9a58d7 | 204 | /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */ |
1da177e4 | 205 | #define NEW_AUX_ENT(id, val) \ |
f4e5cc2c | 206 | do { \ |
785d5570 JJ |
207 | elf_info[ei_index++] = id; \ |
208 | elf_info[ei_index++] = val; \ | |
f4e5cc2c | 209 | } while (0) |
1da177e4 LT |
210 | |
211 | #ifdef ARCH_DLINFO | |
212 | /* | |
213 | * ARCH_DLINFO must come first so PPC can do its special alignment of | |
214 | * AUXV. | |
4f9a58d7 OH |
215 | * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in |
216 | * ARCH_DLINFO changes | |
1da177e4 LT |
217 | */ |
218 | ARCH_DLINFO; | |
219 | #endif | |
220 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); | |
221 | NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE); | |
222 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
223 | NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff); | |
f4e5cc2c | 224 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
1da177e4 LT |
225 | NEW_AUX_ENT(AT_PHNUM, exec->e_phnum); |
226 | NEW_AUX_ENT(AT_BASE, interp_load_addr); | |
227 | NEW_AUX_ENT(AT_FLAGS, 0); | |
228 | NEW_AUX_ENT(AT_ENTRY, exec->e_entry); | |
ebc887b2 EB |
229 | NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid)); |
230 | NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid)); | |
231 | NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid)); | |
232 | NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid)); | |
785d5570 | 233 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
f06295b4 | 234 | NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes); |
65191087 | 235 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
1da177e4 | 236 | if (k_platform) { |
f4e5cc2c | 237 | NEW_AUX_ENT(AT_PLATFORM, |
785d5570 | 238 | (elf_addr_t)(unsigned long)u_platform); |
1da177e4 | 239 | } |
483fad1c NL |
240 | if (k_base_platform) { |
241 | NEW_AUX_ENT(AT_BASE_PLATFORM, | |
242 | (elf_addr_t)(unsigned long)u_base_platform); | |
243 | } | |
1da177e4 | 244 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
785d5570 | 245 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); |
1da177e4 LT |
246 | } |
247 | #undef NEW_AUX_ENT | |
248 | /* AT_NULL is zero; clear the rest too */ | |
249 | memset(&elf_info[ei_index], 0, | |
250 | sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]); | |
251 | ||
252 | /* And advance past the AT_NULL entry. */ | |
253 | ei_index += 2; | |
254 | ||
255 | sp = STACK_ADD(p, ei_index); | |
256 | ||
d20894a2 | 257 | items = (argc + 1) + (envc + 1) + 1; |
1da177e4 LT |
258 | bprm->p = STACK_ROUND(sp, items); |
259 | ||
260 | /* Point sp at the lowest address on the stack */ | |
261 | #ifdef CONFIG_STACK_GROWSUP | |
262 | sp = (elf_addr_t __user *)bprm->p - items - ei_index; | |
f4e5cc2c | 263 | bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */ |
1da177e4 LT |
264 | #else |
265 | sp = (elf_addr_t __user *)bprm->p; | |
266 | #endif | |
267 | ||
b6a2fea3 OW |
268 | |
269 | /* | |
270 | * Grow the stack manually; some architectures have a limit on how | |
271 | * far ahead a user-space access may be in order to grow the stack. | |
272 | */ | |
273 | vma = find_extend_vma(current->mm, bprm->p); | |
274 | if (!vma) | |
275 | return -EFAULT; | |
276 | ||
1da177e4 LT |
277 | /* Now, let's put argc (and argv, envp if appropriate) on the stack */ |
278 | if (__put_user(argc, sp++)) | |
279 | return -EFAULT; | |
d20894a2 AK |
280 | argv = sp; |
281 | envp = argv + argc + 1; | |
1da177e4 LT |
282 | |
283 | /* Populate argv and envp */ | |
a84a5059 | 284 | p = current->mm->arg_end = current->mm->arg_start; |
1da177e4 LT |
285 | while (argc-- > 0) { |
286 | size_t len; | |
841d5fb7 HC |
287 | if (__put_user((elf_addr_t)p, argv++)) |
288 | return -EFAULT; | |
b6a2fea3 OW |
289 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
290 | if (!len || len > MAX_ARG_STRLEN) | |
23c4971e | 291 | return -EINVAL; |
1da177e4 LT |
292 | p += len; |
293 | } | |
294 | if (__put_user(0, argv)) | |
295 | return -EFAULT; | |
296 | current->mm->arg_end = current->mm->env_start = p; | |
297 | while (envc-- > 0) { | |
298 | size_t len; | |
841d5fb7 HC |
299 | if (__put_user((elf_addr_t)p, envp++)) |
300 | return -EFAULT; | |
b6a2fea3 OW |
301 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
302 | if (!len || len > MAX_ARG_STRLEN) | |
23c4971e | 303 | return -EINVAL; |
1da177e4 LT |
304 | p += len; |
305 | } | |
306 | if (__put_user(0, envp)) | |
307 | return -EFAULT; | |
308 | current->mm->env_end = p; | |
309 | ||
310 | /* Put the elf_info on the stack in the right place. */ | |
311 | sp = (elf_addr_t __user *)envp + 1; | |
312 | if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t))) | |
313 | return -EFAULT; | |
314 | return 0; | |
315 | } | |
316 | ||
1da177e4 | 317 | static unsigned long elf_map(struct file *filep, unsigned long addr, |
cc503c1b JK |
318 | struct elf_phdr *eppnt, int prot, int type, |
319 | unsigned long total_size) | |
1da177e4 LT |
320 | { |
321 | unsigned long map_addr; | |
cc503c1b JK |
322 | unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr); |
323 | unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr); | |
324 | addr = ELF_PAGESTART(addr); | |
325 | size = ELF_PAGEALIGN(size); | |
1da177e4 | 326 | |
dda6ebde DG |
327 | /* mmap() will return -EINVAL if given a zero size, but a |
328 | * segment with zero filesize is perfectly valid */ | |
cc503c1b JK |
329 | if (!size) |
330 | return addr; | |
331 | ||
332 | down_write(¤t->mm->mmap_sem); | |
333 | /* | |
334 | * total_size is the size of the ELF (interpreter) image. | |
335 | * The _first_ mmap needs to know the full size, otherwise | |
336 | * randomization might put this image into an overlapping | |
337 | * position with the ELF binary image. (since size < total_size) | |
338 | * So we first map the 'big' image - and unmap the remainder at | |
339 | * the end. (which unmap is needed for ELF images with holes.) | |
340 | */ | |
341 | if (total_size) { | |
342 | total_size = ELF_PAGEALIGN(total_size); | |
343 | map_addr = do_mmap(filep, addr, total_size, prot, type, off); | |
344 | if (!BAD_ADDR(map_addr)) | |
345 | do_munmap(current->mm, map_addr+size, total_size-size); | |
346 | } else | |
347 | map_addr = do_mmap(filep, addr, size, prot, type, off); | |
348 | ||
1da177e4 LT |
349 | up_write(¤t->mm->mmap_sem); |
350 | return(map_addr); | |
351 | } | |
352 | ||
cc503c1b JK |
353 | static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr) |
354 | { | |
355 | int i, first_idx = -1, last_idx = -1; | |
356 | ||
357 | for (i = 0; i < nr; i++) { | |
358 | if (cmds[i].p_type == PT_LOAD) { | |
359 | last_idx = i; | |
360 | if (first_idx == -1) | |
361 | first_idx = i; | |
362 | } | |
363 | } | |
364 | if (first_idx == -1) | |
365 | return 0; | |
366 | ||
367 | return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz - | |
368 | ELF_PAGESTART(cmds[first_idx].p_vaddr); | |
369 | } | |
370 | ||
371 | ||
1da177e4 LT |
372 | /* This is much more generalized than the library routine read function, |
373 | so we keep this separate. Technically the library read function | |
374 | is only provided so that we can read a.out libraries that have | |
375 | an ELF header */ | |
376 | ||
f4e5cc2c | 377 | static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex, |
cc503c1b JK |
378 | struct file *interpreter, unsigned long *interp_map_addr, |
379 | unsigned long no_base) | |
1da177e4 LT |
380 | { |
381 | struct elf_phdr *elf_phdata; | |
382 | struct elf_phdr *eppnt; | |
383 | unsigned long load_addr = 0; | |
384 | int load_addr_set = 0; | |
385 | unsigned long last_bss = 0, elf_bss = 0; | |
386 | unsigned long error = ~0UL; | |
cc503c1b | 387 | unsigned long total_size; |
1da177e4 LT |
388 | int retval, i, size; |
389 | ||
390 | /* First of all, some simple consistency checks */ | |
391 | if (interp_elf_ex->e_type != ET_EXEC && | |
392 | interp_elf_ex->e_type != ET_DYN) | |
393 | goto out; | |
394 | if (!elf_check_arch(interp_elf_ex)) | |
395 | goto out; | |
396 | if (!interpreter->f_op || !interpreter->f_op->mmap) | |
397 | goto out; | |
398 | ||
399 | /* | |
400 | * If the size of this structure has changed, then punt, since | |
401 | * we will be doing the wrong thing. | |
402 | */ | |
403 | if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) | |
404 | goto out; | |
405 | if (interp_elf_ex->e_phnum < 1 || | |
406 | interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr)) | |
407 | goto out; | |
408 | ||
409 | /* Now read in all of the header information */ | |
1da177e4 LT |
410 | size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum; |
411 | if (size > ELF_MIN_ALIGN) | |
412 | goto out; | |
f4e5cc2c | 413 | elf_phdata = kmalloc(size, GFP_KERNEL); |
1da177e4 LT |
414 | if (!elf_phdata) |
415 | goto out; | |
416 | ||
f4e5cc2c | 417 | retval = kernel_read(interpreter, interp_elf_ex->e_phoff, |
f670d0ec | 418 | (char *)elf_phdata, size); |
1da177e4 LT |
419 | error = -EIO; |
420 | if (retval != size) { | |
421 | if (retval < 0) | |
422 | error = retval; | |
423 | goto out_close; | |
424 | } | |
425 | ||
cc503c1b JK |
426 | total_size = total_mapping_size(elf_phdata, interp_elf_ex->e_phnum); |
427 | if (!total_size) { | |
428 | error = -EINVAL; | |
429 | goto out_close; | |
430 | } | |
431 | ||
1da177e4 | 432 | eppnt = elf_phdata; |
f4e5cc2c JJ |
433 | for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) { |
434 | if (eppnt->p_type == PT_LOAD) { | |
435 | int elf_type = MAP_PRIVATE | MAP_DENYWRITE; | |
436 | int elf_prot = 0; | |
437 | unsigned long vaddr = 0; | |
438 | unsigned long k, map_addr; | |
439 | ||
440 | if (eppnt->p_flags & PF_R) | |
441 | elf_prot = PROT_READ; | |
442 | if (eppnt->p_flags & PF_W) | |
443 | elf_prot |= PROT_WRITE; | |
444 | if (eppnt->p_flags & PF_X) | |
445 | elf_prot |= PROT_EXEC; | |
446 | vaddr = eppnt->p_vaddr; | |
447 | if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) | |
448 | elf_type |= MAP_FIXED; | |
cc503c1b JK |
449 | else if (no_base && interp_elf_ex->e_type == ET_DYN) |
450 | load_addr = -vaddr; | |
f4e5cc2c JJ |
451 | |
452 | map_addr = elf_map(interpreter, load_addr + vaddr, | |
bb1ad820 | 453 | eppnt, elf_prot, elf_type, total_size); |
cc503c1b JK |
454 | total_size = 0; |
455 | if (!*interp_map_addr) | |
456 | *interp_map_addr = map_addr; | |
f4e5cc2c JJ |
457 | error = map_addr; |
458 | if (BAD_ADDR(map_addr)) | |
459 | goto out_close; | |
460 | ||
461 | if (!load_addr_set && | |
462 | interp_elf_ex->e_type == ET_DYN) { | |
463 | load_addr = map_addr - ELF_PAGESTART(vaddr); | |
464 | load_addr_set = 1; | |
465 | } | |
466 | ||
467 | /* | |
468 | * Check to see if the section's size will overflow the | |
469 | * allowed task size. Note that p_filesz must always be | |
470 | * <= p_memsize so it's only necessary to check p_memsz. | |
471 | */ | |
472 | k = load_addr + eppnt->p_vaddr; | |
ce51059b | 473 | if (BAD_ADDR(k) || |
f4e5cc2c JJ |
474 | eppnt->p_filesz > eppnt->p_memsz || |
475 | eppnt->p_memsz > TASK_SIZE || | |
476 | TASK_SIZE - eppnt->p_memsz < k) { | |
477 | error = -ENOMEM; | |
478 | goto out_close; | |
479 | } | |
480 | ||
481 | /* | |
482 | * Find the end of the file mapping for this phdr, and | |
483 | * keep track of the largest address we see for this. | |
484 | */ | |
485 | k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; | |
486 | if (k > elf_bss) | |
487 | elf_bss = k; | |
488 | ||
489 | /* | |
490 | * Do the same thing for the memory mapping - between | |
491 | * elf_bss and last_bss is the bss section. | |
492 | */ | |
493 | k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; | |
494 | if (k > last_bss) | |
495 | last_bss = k; | |
496 | } | |
1da177e4 LT |
497 | } |
498 | ||
752015d1 RM |
499 | if (last_bss > elf_bss) { |
500 | /* | |
501 | * Now fill out the bss section. First pad the last page up | |
502 | * to the page boundary, and then perform a mmap to make sure | |
503 | * that there are zero-mapped pages up to and including the | |
504 | * last bss page. | |
505 | */ | |
506 | if (padzero(elf_bss)) { | |
507 | error = -EFAULT; | |
508 | goto out_close; | |
509 | } | |
1da177e4 | 510 | |
752015d1 RM |
511 | /* What we have mapped so far */ |
512 | elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1); | |
1da177e4 | 513 | |
752015d1 | 514 | /* Map the last of the bss segment */ |
e4eb1ff6 | 515 | error = vm_brk(elf_bss, last_bss - elf_bss); |
1da177e4 LT |
516 | if (BAD_ADDR(error)) |
517 | goto out_close; | |
518 | } | |
519 | ||
cc503c1b | 520 | error = load_addr; |
1da177e4 LT |
521 | |
522 | out_close: | |
523 | kfree(elf_phdata); | |
524 | out: | |
525 | return error; | |
526 | } | |
527 | ||
1da177e4 LT |
528 | /* |
529 | * These are the functions used to load ELF style executables and shared | |
530 | * libraries. There is no binary dependent code anywhere else. | |
531 | */ | |
532 | ||
533 | #define INTERPRETER_NONE 0 | |
1da177e4 LT |
534 | #define INTERPRETER_ELF 2 |
535 | ||
913bd906 | 536 | #ifndef STACK_RND_MASK |
d1cabd63 | 537 | #define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) /* 8MB of VA */ |
913bd906 | 538 | #endif |
1da177e4 LT |
539 | |
540 | static unsigned long randomize_stack_top(unsigned long stack_top) | |
541 | { | |
542 | unsigned int random_variable = 0; | |
543 | ||
c16b63e0 AK |
544 | if ((current->flags & PF_RANDOMIZE) && |
545 | !(current->personality & ADDR_NO_RANDOMIZE)) { | |
913bd906 AK |
546 | random_variable = get_random_int() & STACK_RND_MASK; |
547 | random_variable <<= PAGE_SHIFT; | |
548 | } | |
1da177e4 | 549 | #ifdef CONFIG_STACK_GROWSUP |
913bd906 | 550 | return PAGE_ALIGN(stack_top) + random_variable; |
1da177e4 | 551 | #else |
913bd906 | 552 | return PAGE_ALIGN(stack_top) - random_variable; |
1da177e4 LT |
553 | #endif |
554 | } | |
555 | ||
f4e5cc2c | 556 | static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs) |
1da177e4 LT |
557 | { |
558 | struct file *interpreter = NULL; /* to shut gcc up */ | |
559 | unsigned long load_addr = 0, load_bias = 0; | |
560 | int load_addr_set = 0; | |
561 | char * elf_interpreter = NULL; | |
1da177e4 | 562 | unsigned long error; |
f4e5cc2c | 563 | struct elf_phdr *elf_ppnt, *elf_phdata; |
1da177e4 | 564 | unsigned long elf_bss, elf_brk; |
1da177e4 LT |
565 | int retval, i; |
566 | unsigned int size; | |
cc503c1b JK |
567 | unsigned long elf_entry; |
568 | unsigned long interp_load_addr = 0; | |
1da177e4 | 569 | unsigned long start_code, end_code, start_data, end_data; |
1a530a6f | 570 | unsigned long reloc_func_desc __maybe_unused = 0; |
8de61e69 | 571 | int executable_stack = EXSTACK_DEFAULT; |
1da177e4 LT |
572 | unsigned long def_flags = 0; |
573 | struct { | |
574 | struct elfhdr elf_ex; | |
575 | struct elfhdr interp_elf_ex; | |
1da177e4 LT |
576 | } *loc; |
577 | ||
578 | loc = kmalloc(sizeof(*loc), GFP_KERNEL); | |
579 | if (!loc) { | |
580 | retval = -ENOMEM; | |
581 | goto out_ret; | |
582 | } | |
583 | ||
584 | /* Get the exec-header */ | |
f4e5cc2c | 585 | loc->elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4 LT |
586 | |
587 | retval = -ENOEXEC; | |
588 | /* First of all, some simple consistency checks */ | |
589 | if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
590 | goto out; | |
591 | ||
592 | if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN) | |
593 | goto out; | |
594 | if (!elf_check_arch(&loc->elf_ex)) | |
595 | goto out; | |
f670d0ec | 596 | if (!bprm->file->f_op || !bprm->file->f_op->mmap) |
1da177e4 LT |
597 | goto out; |
598 | ||
599 | /* Now read in all of the header information */ | |
1da177e4 LT |
600 | if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr)) |
601 | goto out; | |
602 | if (loc->elf_ex.e_phnum < 1 || | |
603 | loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr)) | |
604 | goto out; | |
605 | size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr); | |
606 | retval = -ENOMEM; | |
f4e5cc2c | 607 | elf_phdata = kmalloc(size, GFP_KERNEL); |
1da177e4 LT |
608 | if (!elf_phdata) |
609 | goto out; | |
610 | ||
f4e5cc2c JJ |
611 | retval = kernel_read(bprm->file, loc->elf_ex.e_phoff, |
612 | (char *)elf_phdata, size); | |
1da177e4 LT |
613 | if (retval != size) { |
614 | if (retval >= 0) | |
615 | retval = -EIO; | |
616 | goto out_free_ph; | |
617 | } | |
618 | ||
1da177e4 LT |
619 | elf_ppnt = elf_phdata; |
620 | elf_bss = 0; | |
621 | elf_brk = 0; | |
622 | ||
623 | start_code = ~0UL; | |
624 | end_code = 0; | |
625 | start_data = 0; | |
626 | end_data = 0; | |
627 | ||
628 | for (i = 0; i < loc->elf_ex.e_phnum; i++) { | |
629 | if (elf_ppnt->p_type == PT_INTERP) { | |
630 | /* This is the program interpreter used for | |
631 | * shared libraries - for now assume that this | |
632 | * is an a.out format binary | |
633 | */ | |
1da177e4 LT |
634 | retval = -ENOEXEC; |
635 | if (elf_ppnt->p_filesz > PATH_MAX || | |
636 | elf_ppnt->p_filesz < 2) | |
e7b9b550 | 637 | goto out_free_ph; |
1da177e4 LT |
638 | |
639 | retval = -ENOMEM; | |
792db3af | 640 | elf_interpreter = kmalloc(elf_ppnt->p_filesz, |
f4e5cc2c | 641 | GFP_KERNEL); |
1da177e4 | 642 | if (!elf_interpreter) |
e7b9b550 | 643 | goto out_free_ph; |
1da177e4 LT |
644 | |
645 | retval = kernel_read(bprm->file, elf_ppnt->p_offset, | |
f4e5cc2c JJ |
646 | elf_interpreter, |
647 | elf_ppnt->p_filesz); | |
1da177e4 LT |
648 | if (retval != elf_ppnt->p_filesz) { |
649 | if (retval >= 0) | |
650 | retval = -EIO; | |
651 | goto out_free_interp; | |
652 | } | |
653 | /* make sure path is NULL terminated */ | |
654 | retval = -ENOEXEC; | |
655 | if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0') | |
656 | goto out_free_interp; | |
657 | ||
1da177e4 LT |
658 | interpreter = open_exec(elf_interpreter); |
659 | retval = PTR_ERR(interpreter); | |
660 | if (IS_ERR(interpreter)) | |
661 | goto out_free_interp; | |
1fb84496 AD |
662 | |
663 | /* | |
664 | * If the binary is not readable then enforce | |
665 | * mm->dumpable = 0 regardless of the interpreter's | |
666 | * permissions. | |
667 | */ | |
1b5d783c | 668 | would_dump(bprm, interpreter); |
1fb84496 | 669 | |
f4e5cc2c JJ |
670 | retval = kernel_read(interpreter, 0, bprm->buf, |
671 | BINPRM_BUF_SIZE); | |
1da177e4 LT |
672 | if (retval != BINPRM_BUF_SIZE) { |
673 | if (retval >= 0) | |
674 | retval = -EIO; | |
675 | goto out_free_dentry; | |
676 | } | |
677 | ||
678 | /* Get the exec headers */ | |
f4e5cc2c | 679 | loc->interp_elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4 LT |
680 | break; |
681 | } | |
682 | elf_ppnt++; | |
683 | } | |
684 | ||
685 | elf_ppnt = elf_phdata; | |
686 | for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) | |
687 | if (elf_ppnt->p_type == PT_GNU_STACK) { | |
688 | if (elf_ppnt->p_flags & PF_X) | |
689 | executable_stack = EXSTACK_ENABLE_X; | |
690 | else | |
691 | executable_stack = EXSTACK_DISABLE_X; | |
692 | break; | |
693 | } | |
1da177e4 LT |
694 | |
695 | /* Some simple consistency checks for the interpreter */ | |
696 | if (elf_interpreter) { | |
1da177e4 | 697 | retval = -ELIBBAD; |
d20894a2 AK |
698 | /* Not an ELF interpreter */ |
699 | if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1da177e4 | 700 | goto out_free_dentry; |
1da177e4 | 701 | /* Verify the interpreter has a valid arch */ |
d20894a2 | 702 | if (!elf_check_arch(&loc->interp_elf_ex)) |
1da177e4 | 703 | goto out_free_dentry; |
1da177e4 LT |
704 | } |
705 | ||
1da177e4 LT |
706 | /* Flush all traces of the currently running executable */ |
707 | retval = flush_old_exec(bprm); | |
708 | if (retval) | |
709 | goto out_free_dentry; | |
710 | ||
1da177e4 | 711 | /* OK, This is the point of no return */ |
1da177e4 LT |
712 | current->mm->def_flags = def_flags; |
713 | ||
714 | /* Do this immediately, since STACK_TOP as used in setup_arg_pages | |
715 | may depend on the personality. */ | |
0b592682 | 716 | SET_PERSONALITY(loc->elf_ex); |
1da177e4 LT |
717 | if (elf_read_implies_exec(loc->elf_ex, executable_stack)) |
718 | current->personality |= READ_IMPLIES_EXEC; | |
719 | ||
f4e5cc2c | 720 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
1da177e4 | 721 | current->flags |= PF_RANDOMIZE; |
221af7f8 LT |
722 | |
723 | setup_new_exec(bprm); | |
1da177e4 LT |
724 | |
725 | /* Do this so that we can load the interpreter, if need be. We will | |
726 | change some of these later */ | |
1da177e4 | 727 | current->mm->free_area_cache = current->mm->mmap_base; |
1363c3cd | 728 | current->mm->cached_hole_size = 0; |
1da177e4 LT |
729 | retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP), |
730 | executable_stack); | |
731 | if (retval < 0) { | |
732 | send_sig(SIGKILL, current, 0); | |
733 | goto out_free_dentry; | |
734 | } | |
735 | ||
1da177e4 LT |
736 | current->mm->start_stack = bprm->p; |
737 | ||
af901ca1 | 738 | /* Now we do a little grungy work by mmapping the ELF image into |
cc503c1b | 739 | the correct location in memory. */ |
f4e5cc2c JJ |
740 | for(i = 0, elf_ppnt = elf_phdata; |
741 | i < loc->elf_ex.e_phnum; i++, elf_ppnt++) { | |
1da177e4 LT |
742 | int elf_prot = 0, elf_flags; |
743 | unsigned long k, vaddr; | |
744 | ||
745 | if (elf_ppnt->p_type != PT_LOAD) | |
746 | continue; | |
747 | ||
748 | if (unlikely (elf_brk > elf_bss)) { | |
749 | unsigned long nbyte; | |
750 | ||
751 | /* There was a PT_LOAD segment with p_memsz > p_filesz | |
752 | before this one. Map anonymous pages, if needed, | |
753 | and clear the area. */ | |
f670d0ec MP |
754 | retval = set_brk(elf_bss + load_bias, |
755 | elf_brk + load_bias); | |
1da177e4 LT |
756 | if (retval) { |
757 | send_sig(SIGKILL, current, 0); | |
758 | goto out_free_dentry; | |
759 | } | |
760 | nbyte = ELF_PAGEOFFSET(elf_bss); | |
761 | if (nbyte) { | |
762 | nbyte = ELF_MIN_ALIGN - nbyte; | |
763 | if (nbyte > elf_brk - elf_bss) | |
764 | nbyte = elf_brk - elf_bss; | |
765 | if (clear_user((void __user *)elf_bss + | |
766 | load_bias, nbyte)) { | |
767 | /* | |
768 | * This bss-zeroing can fail if the ELF | |
f4e5cc2c | 769 | * file specifies odd protections. So |
1da177e4 LT |
770 | * we don't check the return value |
771 | */ | |
772 | } | |
773 | } | |
774 | } | |
775 | ||
f4e5cc2c JJ |
776 | if (elf_ppnt->p_flags & PF_R) |
777 | elf_prot |= PROT_READ; | |
778 | if (elf_ppnt->p_flags & PF_W) | |
779 | elf_prot |= PROT_WRITE; | |
780 | if (elf_ppnt->p_flags & PF_X) | |
781 | elf_prot |= PROT_EXEC; | |
1da177e4 | 782 | |
f4e5cc2c | 783 | elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE; |
1da177e4 LT |
784 | |
785 | vaddr = elf_ppnt->p_vaddr; | |
786 | if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) { | |
787 | elf_flags |= MAP_FIXED; | |
788 | } else if (loc->elf_ex.e_type == ET_DYN) { | |
f4e5cc2c JJ |
789 | /* Try and get dynamic programs out of the way of the |
790 | * default mmap base, as well as whatever program they | |
791 | * might try to exec. This is because the brk will | |
792 | * follow the loader, and is not movable. */ | |
e39f5602 | 793 | #ifdef CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE |
a3defbe5 JK |
794 | /* Memory randomization might have been switched off |
795 | * in runtime via sysctl. | |
796 | * If that is the case, retain the original non-zero | |
797 | * load_bias value in order to establish proper | |
798 | * non-randomized mappings. | |
799 | */ | |
800 | if (current->flags & PF_RANDOMIZE) | |
801 | load_bias = 0; | |
802 | else | |
803 | load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); | |
cc503c1b | 804 | #else |
90cb28e8 | 805 | load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); |
cc503c1b | 806 | #endif |
1da177e4 LT |
807 | } |
808 | ||
f4e5cc2c | 809 | error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, |
bb1ad820 | 810 | elf_prot, elf_flags, 0); |
1da177e4 LT |
811 | if (BAD_ADDR(error)) { |
812 | send_sig(SIGKILL, current, 0); | |
b140f251 AK |
813 | retval = IS_ERR((void *)error) ? |
814 | PTR_ERR((void*)error) : -EINVAL; | |
1da177e4 LT |
815 | goto out_free_dentry; |
816 | } | |
817 | ||
818 | if (!load_addr_set) { | |
819 | load_addr_set = 1; | |
820 | load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset); | |
821 | if (loc->elf_ex.e_type == ET_DYN) { | |
822 | load_bias += error - | |
823 | ELF_PAGESTART(load_bias + vaddr); | |
824 | load_addr += load_bias; | |
825 | reloc_func_desc = load_bias; | |
826 | } | |
827 | } | |
828 | k = elf_ppnt->p_vaddr; | |
f4e5cc2c JJ |
829 | if (k < start_code) |
830 | start_code = k; | |
831 | if (start_data < k) | |
832 | start_data = k; | |
1da177e4 LT |
833 | |
834 | /* | |
835 | * Check to see if the section's size will overflow the | |
836 | * allowed task size. Note that p_filesz must always be | |
837 | * <= p_memsz so it is only necessary to check p_memsz. | |
838 | */ | |
ce51059b | 839 | if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz || |
1da177e4 LT |
840 | elf_ppnt->p_memsz > TASK_SIZE || |
841 | TASK_SIZE - elf_ppnt->p_memsz < k) { | |
f4e5cc2c | 842 | /* set_brk can never work. Avoid overflows. */ |
1da177e4 | 843 | send_sig(SIGKILL, current, 0); |
b140f251 | 844 | retval = -EINVAL; |
1da177e4 LT |
845 | goto out_free_dentry; |
846 | } | |
847 | ||
848 | k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; | |
849 | ||
850 | if (k > elf_bss) | |
851 | elf_bss = k; | |
852 | if ((elf_ppnt->p_flags & PF_X) && end_code < k) | |
853 | end_code = k; | |
854 | if (end_data < k) | |
855 | end_data = k; | |
856 | k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; | |
857 | if (k > elf_brk) | |
858 | elf_brk = k; | |
859 | } | |
860 | ||
861 | loc->elf_ex.e_entry += load_bias; | |
862 | elf_bss += load_bias; | |
863 | elf_brk += load_bias; | |
864 | start_code += load_bias; | |
865 | end_code += load_bias; | |
866 | start_data += load_bias; | |
867 | end_data += load_bias; | |
868 | ||
869 | /* Calling set_brk effectively mmaps the pages that we need | |
870 | * for the bss and break sections. We must do this before | |
871 | * mapping in the interpreter, to make sure it doesn't wind | |
872 | * up getting placed where the bss needs to go. | |
873 | */ | |
874 | retval = set_brk(elf_bss, elf_brk); | |
875 | if (retval) { | |
876 | send_sig(SIGKILL, current, 0); | |
877 | goto out_free_dentry; | |
878 | } | |
6de50517 | 879 | if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) { |
1da177e4 LT |
880 | send_sig(SIGSEGV, current, 0); |
881 | retval = -EFAULT; /* Nobody gets to see this, but.. */ | |
882 | goto out_free_dentry; | |
883 | } | |
884 | ||
885 | if (elf_interpreter) { | |
d20894a2 AK |
886 | unsigned long uninitialized_var(interp_map_addr); |
887 | ||
888 | elf_entry = load_elf_interp(&loc->interp_elf_ex, | |
889 | interpreter, | |
890 | &interp_map_addr, | |
891 | load_bias); | |
892 | if (!IS_ERR((void *)elf_entry)) { | |
893 | /* | |
894 | * load_elf_interp() returns relocation | |
895 | * adjustment | |
896 | */ | |
897 | interp_load_addr = elf_entry; | |
898 | elf_entry += loc->interp_elf_ex.e_entry; | |
cc503c1b | 899 | } |
1da177e4 | 900 | if (BAD_ADDR(elf_entry)) { |
1da177e4 | 901 | force_sig(SIGSEGV, current); |
ce51059b CE |
902 | retval = IS_ERR((void *)elf_entry) ? |
903 | (int)elf_entry : -EINVAL; | |
1da177e4 LT |
904 | goto out_free_dentry; |
905 | } | |
906 | reloc_func_desc = interp_load_addr; | |
907 | ||
908 | allow_write_access(interpreter); | |
909 | fput(interpreter); | |
910 | kfree(elf_interpreter); | |
911 | } else { | |
912 | elf_entry = loc->elf_ex.e_entry; | |
5342fba5 | 913 | if (BAD_ADDR(elf_entry)) { |
ce51059b CE |
914 | force_sig(SIGSEGV, current); |
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); |
547ee84c BH |
926 | if (retval < 0) { |
927 | send_sig(SIGKILL, current, 0); | |
18c8baff | 928 | goto out; |
547ee84c BH |
929 | } |
930 | #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */ | |
931 | ||
a6f76f23 | 932 | install_exec_creds(bprm); |
b6a2fea3 | 933 | retval = create_elf_tables(bprm, &loc->elf_ex, |
f4e5cc2c | 934 | load_addr, interp_load_addr); |
b6a2fea3 OW |
935 | if (retval < 0) { |
936 | send_sig(SIGKILL, current, 0); | |
937 | goto out; | |
938 | } | |
1da177e4 | 939 | /* N.B. passed_fileno might not be initialized? */ |
1da177e4 LT |
940 | current->mm->end_code = end_code; |
941 | current->mm->start_code = start_code; | |
942 | current->mm->start_data = start_data; | |
943 | current->mm->end_data = end_data; | |
944 | current->mm->start_stack = bprm->p; | |
945 | ||
c1d171a0 | 946 | #ifdef arch_randomize_brk |
4471a675 | 947 | if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) { |
c1d171a0 JK |
948 | current->mm->brk = current->mm->start_brk = |
949 | arch_randomize_brk(current->mm); | |
4471a675 JK |
950 | #ifdef CONFIG_COMPAT_BRK |
951 | current->brk_randomized = 1; | |
952 | #endif | |
953 | } | |
c1d171a0 JK |
954 | #endif |
955 | ||
1da177e4 LT |
956 | if (current->personality & MMAP_PAGE_ZERO) { |
957 | /* Why this, you ask??? Well SVr4 maps page 0 as read-only, | |
958 | and some applications "depend" upon this behavior. | |
959 | Since we do not have the power to recompile these, we | |
f4e5cc2c | 960 | emulate the SVr4 behavior. Sigh. */ |
6be5ceb0 | 961 | error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC, |
1da177e4 | 962 | MAP_FIXED | MAP_PRIVATE, 0); |
1da177e4 LT |
963 | } |
964 | ||
965 | #ifdef ELF_PLAT_INIT | |
966 | /* | |
967 | * The ABI may specify that certain registers be set up in special | |
968 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
969 | * example. In addition, it may also specify (eg, PowerPC64 ELF) | |
970 | * that the e_entry field is the address of the function descriptor | |
971 | * for the startup routine, rather than the address of the startup | |
972 | * routine itself. This macro performs whatever initialization to | |
973 | * the regs structure is required as well as any relocations to the | |
974 | * function descriptor entries when executing dynamically links apps. | |
975 | */ | |
976 | ELF_PLAT_INIT(regs, reloc_func_desc); | |
977 | #endif | |
978 | ||
979 | start_thread(regs, elf_entry, bprm->p); | |
1da177e4 LT |
980 | retval = 0; |
981 | out: | |
982 | kfree(loc); | |
983 | out_ret: | |
984 | return retval; | |
985 | ||
986 | /* error cleanup */ | |
987 | out_free_dentry: | |
988 | allow_write_access(interpreter); | |
989 | if (interpreter) | |
990 | fput(interpreter); | |
991 | out_free_interp: | |
f99d49ad | 992 | kfree(elf_interpreter); |
1da177e4 LT |
993 | out_free_ph: |
994 | kfree(elf_phdata); | |
995 | goto out; | |
996 | } | |
997 | ||
998 | /* This is really simpleminded and specialized - we are loading an | |
999 | a.out library that is given an ELF header. */ | |
1da177e4 LT |
1000 | static int load_elf_library(struct file *file) |
1001 | { | |
1002 | struct elf_phdr *elf_phdata; | |
1003 | struct elf_phdr *eppnt; | |
1004 | unsigned long elf_bss, bss, len; | |
1005 | int retval, error, i, j; | |
1006 | struct elfhdr elf_ex; | |
1007 | ||
1008 | error = -ENOEXEC; | |
f4e5cc2c | 1009 | retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex)); |
1da177e4 LT |
1010 | if (retval != sizeof(elf_ex)) |
1011 | goto out; | |
1012 | ||
1013 | if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1014 | goto out; | |
1015 | ||
1016 | /* First of all, some simple consistency checks */ | |
1017 | if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 || | |
f4e5cc2c | 1018 | !elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap) |
1da177e4 LT |
1019 | goto out; |
1020 | ||
1021 | /* Now read in all of the header information */ | |
1022 | ||
1023 | j = sizeof(struct elf_phdr) * elf_ex.e_phnum; | |
1024 | /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */ | |
1025 | ||
1026 | error = -ENOMEM; | |
1027 | elf_phdata = kmalloc(j, GFP_KERNEL); | |
1028 | if (!elf_phdata) | |
1029 | goto out; | |
1030 | ||
1031 | eppnt = elf_phdata; | |
1032 | error = -ENOEXEC; | |
1033 | retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j); | |
1034 | if (retval != j) | |
1035 | goto out_free_ph; | |
1036 | ||
1037 | for (j = 0, i = 0; i<elf_ex.e_phnum; i++) | |
1038 | if ((eppnt + i)->p_type == PT_LOAD) | |
1039 | j++; | |
1040 | if (j != 1) | |
1041 | goto out_free_ph; | |
1042 | ||
1043 | while (eppnt->p_type != PT_LOAD) | |
1044 | eppnt++; | |
1045 | ||
1046 | /* Now use mmap to map the library into memory. */ | |
6be5ceb0 | 1047 | error = vm_mmap(file, |
1da177e4 LT |
1048 | ELF_PAGESTART(eppnt->p_vaddr), |
1049 | (eppnt->p_filesz + | |
1050 | ELF_PAGEOFFSET(eppnt->p_vaddr)), | |
1051 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
1052 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, | |
1053 | (eppnt->p_offset - | |
1054 | ELF_PAGEOFFSET(eppnt->p_vaddr))); | |
1da177e4 LT |
1055 | if (error != ELF_PAGESTART(eppnt->p_vaddr)) |
1056 | goto out_free_ph; | |
1057 | ||
1058 | elf_bss = eppnt->p_vaddr + eppnt->p_filesz; | |
1059 | if (padzero(elf_bss)) { | |
1060 | error = -EFAULT; | |
1061 | goto out_free_ph; | |
1062 | } | |
1063 | ||
f4e5cc2c JJ |
1064 | len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + |
1065 | ELF_MIN_ALIGN - 1); | |
1da177e4 | 1066 | bss = eppnt->p_memsz + eppnt->p_vaddr; |
e4eb1ff6 LT |
1067 | if (bss > len) |
1068 | vm_brk(len, bss - len); | |
1da177e4 LT |
1069 | error = 0; |
1070 | ||
1071 | out_free_ph: | |
1072 | kfree(elf_phdata); | |
1073 | out: | |
1074 | return error; | |
1075 | } | |
1076 | ||
698ba7b5 | 1077 | #ifdef CONFIG_ELF_CORE |
1da177e4 LT |
1078 | /* |
1079 | * ELF core dumper | |
1080 | * | |
1081 | * Modelled on fs/exec.c:aout_core_dump() | |
1082 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1083 | */ | |
1da177e4 | 1084 | |
909af768 JB |
1085 | /* |
1086 | * The purpose of always_dump_vma() is to make sure that special kernel mappings | |
1087 | * that are useful for post-mortem analysis are included in every core dump. | |
1088 | * In that way we ensure that the core dump is fully interpretable later | |
1089 | * without matching up the same kernel and hardware config to see what PC values | |
1090 | * meant. These special mappings include - vDSO, vsyscall, and other | |
1091 | * architecture specific mappings | |
1092 | */ | |
1093 | static bool always_dump_vma(struct vm_area_struct *vma) | |
1094 | { | |
1095 | /* Any vsyscall mappings? */ | |
1096 | if (vma == get_gate_vma(vma->vm_mm)) | |
1097 | return true; | |
1098 | /* | |
1099 | * arch_vma_name() returns non-NULL for special architecture mappings, | |
1100 | * such as vDSO sections. | |
1101 | */ | |
1102 | if (arch_vma_name(vma)) | |
1103 | return true; | |
1104 | ||
1105 | return false; | |
1106 | } | |
1107 | ||
1da177e4 | 1108 | /* |
82df3973 | 1109 | * Decide what to dump of a segment, part, all or none. |
1da177e4 | 1110 | */ |
82df3973 RM |
1111 | static unsigned long vma_dump_size(struct vm_area_struct *vma, |
1112 | unsigned long mm_flags) | |
1da177e4 | 1113 | { |
e575f111 KM |
1114 | #define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type)) |
1115 | ||
909af768 JB |
1116 | /* always dump the vdso and vsyscall sections */ |
1117 | if (always_dump_vma(vma)) | |
82df3973 | 1118 | goto whole; |
e5b97dde | 1119 | |
accb61fe JB |
1120 | if (vma->vm_flags & VM_NODUMP) |
1121 | return 0; | |
1122 | ||
e575f111 KM |
1123 | /* Hugetlb memory check */ |
1124 | if (vma->vm_flags & VM_HUGETLB) { | |
1125 | if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED)) | |
1126 | goto whole; | |
1127 | if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE)) | |
1128 | goto whole; | |
1129 | } | |
1130 | ||
1da177e4 LT |
1131 | /* Do not dump I/O mapped devices or special mappings */ |
1132 | if (vma->vm_flags & (VM_IO | VM_RESERVED)) | |
1133 | return 0; | |
1134 | ||
a1b59e80 KH |
1135 | /* By default, dump shared memory if mapped from an anonymous file. */ |
1136 | if (vma->vm_flags & VM_SHARED) { | |
82df3973 RM |
1137 | if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0 ? |
1138 | FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED)) | |
1139 | goto whole; | |
1140 | return 0; | |
a1b59e80 | 1141 | } |
1da177e4 | 1142 | |
82df3973 RM |
1143 | /* Dump segments that have been written to. */ |
1144 | if (vma->anon_vma && FILTER(ANON_PRIVATE)) | |
1145 | goto whole; | |
1146 | if (vma->vm_file == NULL) | |
1147 | return 0; | |
1da177e4 | 1148 | |
82df3973 RM |
1149 | if (FILTER(MAPPED_PRIVATE)) |
1150 | goto whole; | |
1151 | ||
1152 | /* | |
1153 | * If this looks like the beginning of a DSO or executable mapping, | |
1154 | * check for an ELF header. If we find one, dump the first page to | |
1155 | * aid in determining what was mapped here. | |
1156 | */ | |
92dc07b1 RM |
1157 | if (FILTER(ELF_HEADERS) && |
1158 | vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) { | |
82df3973 RM |
1159 | u32 __user *header = (u32 __user *) vma->vm_start; |
1160 | u32 word; | |
92dc07b1 | 1161 | mm_segment_t fs = get_fs(); |
82df3973 RM |
1162 | /* |
1163 | * Doing it this way gets the constant folded by GCC. | |
1164 | */ | |
1165 | union { | |
1166 | u32 cmp; | |
1167 | char elfmag[SELFMAG]; | |
1168 | } magic; | |
1169 | BUILD_BUG_ON(SELFMAG != sizeof word); | |
1170 | magic.elfmag[EI_MAG0] = ELFMAG0; | |
1171 | magic.elfmag[EI_MAG1] = ELFMAG1; | |
1172 | magic.elfmag[EI_MAG2] = ELFMAG2; | |
1173 | magic.elfmag[EI_MAG3] = ELFMAG3; | |
92dc07b1 RM |
1174 | /* |
1175 | * Switch to the user "segment" for get_user(), | |
1176 | * then put back what elf_core_dump() had in place. | |
1177 | */ | |
1178 | set_fs(USER_DS); | |
1179 | if (unlikely(get_user(word, header))) | |
1180 | word = 0; | |
1181 | set_fs(fs); | |
1182 | if (word == magic.cmp) | |
82df3973 RM |
1183 | return PAGE_SIZE; |
1184 | } | |
1185 | ||
1186 | #undef FILTER | |
1187 | ||
1188 | return 0; | |
1189 | ||
1190 | whole: | |
1191 | return vma->vm_end - vma->vm_start; | |
1da177e4 LT |
1192 | } |
1193 | ||
1da177e4 LT |
1194 | /* An ELF note in memory */ |
1195 | struct memelfnote | |
1196 | { | |
1197 | const char *name; | |
1198 | int type; | |
1199 | unsigned int datasz; | |
1200 | void *data; | |
1201 | }; | |
1202 | ||
1203 | static int notesize(struct memelfnote *en) | |
1204 | { | |
1205 | int sz; | |
1206 | ||
1207 | sz = sizeof(struct elf_note); | |
1208 | sz += roundup(strlen(en->name) + 1, 4); | |
1209 | sz += roundup(en->datasz, 4); | |
1210 | ||
1211 | return sz; | |
1212 | } | |
1213 | ||
d025c9db AK |
1214 | #define DUMP_WRITE(addr, nr, foffset) \ |
1215 | do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0) | |
1da177e4 | 1216 | |
d025c9db | 1217 | static int alignfile(struct file *file, loff_t *foffset) |
1da177e4 | 1218 | { |
a7a0d86f | 1219 | static const char buf[4] = { 0, }; |
d025c9db AK |
1220 | DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset); |
1221 | return 1; | |
1222 | } | |
1da177e4 | 1223 | |
d025c9db AK |
1224 | static int writenote(struct memelfnote *men, struct file *file, |
1225 | loff_t *foffset) | |
1226 | { | |
1227 | struct elf_note en; | |
1da177e4 LT |
1228 | en.n_namesz = strlen(men->name) + 1; |
1229 | en.n_descsz = men->datasz; | |
1230 | en.n_type = men->type; | |
1231 | ||
d025c9db AK |
1232 | DUMP_WRITE(&en, sizeof(en), foffset); |
1233 | DUMP_WRITE(men->name, en.n_namesz, foffset); | |
1234 | if (!alignfile(file, foffset)) | |
1235 | return 0; | |
1236 | DUMP_WRITE(men->data, men->datasz, foffset); | |
1237 | if (!alignfile(file, foffset)) | |
1238 | return 0; | |
1da177e4 LT |
1239 | |
1240 | return 1; | |
1241 | } | |
1242 | #undef DUMP_WRITE | |
1da177e4 | 1243 | |
3aba481f RM |
1244 | static void fill_elf_header(struct elfhdr *elf, int segs, |
1245 | u16 machine, u32 flags, u8 osabi) | |
1da177e4 | 1246 | { |
6970c8ef CG |
1247 | memset(elf, 0, sizeof(*elf)); |
1248 | ||
1da177e4 LT |
1249 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
1250 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1251 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1252 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1253 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1da177e4 LT |
1254 | |
1255 | elf->e_type = ET_CORE; | |
3aba481f | 1256 | elf->e_machine = machine; |
1da177e4 | 1257 | elf->e_version = EV_CURRENT; |
1da177e4 | 1258 | elf->e_phoff = sizeof(struct elfhdr); |
3aba481f | 1259 | elf->e_flags = flags; |
1da177e4 LT |
1260 | elf->e_ehsize = sizeof(struct elfhdr); |
1261 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1262 | elf->e_phnum = segs; | |
6970c8ef | 1263 | |
1da177e4 LT |
1264 | return; |
1265 | } | |
1266 | ||
8d6b5eee | 1267 | static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1da177e4 LT |
1268 | { |
1269 | phdr->p_type = PT_NOTE; | |
1270 | phdr->p_offset = offset; | |
1271 | phdr->p_vaddr = 0; | |
1272 | phdr->p_paddr = 0; | |
1273 | phdr->p_filesz = sz; | |
1274 | phdr->p_memsz = 0; | |
1275 | phdr->p_flags = 0; | |
1276 | phdr->p_align = 0; | |
1277 | return; | |
1278 | } | |
1279 | ||
1280 | static void fill_note(struct memelfnote *note, const char *name, int type, | |
1281 | unsigned int sz, void *data) | |
1282 | { | |
1283 | note->name = name; | |
1284 | note->type = type; | |
1285 | note->datasz = sz; | |
1286 | note->data = data; | |
1287 | return; | |
1288 | } | |
1289 | ||
1290 | /* | |
f4e5cc2c JJ |
1291 | * fill up all the fields in prstatus from the given task struct, except |
1292 | * registers which need to be filled up separately. | |
1da177e4 LT |
1293 | */ |
1294 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
f4e5cc2c | 1295 | struct task_struct *p, long signr) |
1da177e4 LT |
1296 | { |
1297 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1298 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1299 | prstatus->pr_sighold = p->blocked.sig[0]; | |
3b34fc58 ON |
1300 | rcu_read_lock(); |
1301 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1302 | rcu_read_unlock(); | |
b488893a | 1303 | prstatus->pr_pid = task_pid_vnr(p); |
b488893a PE |
1304 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1305 | prstatus->pr_sid = task_session_vnr(p); | |
1da177e4 | 1306 | if (thread_group_leader(p)) { |
f06febc9 FM |
1307 | struct task_cputime cputime; |
1308 | ||
1da177e4 | 1309 | /* |
f06febc9 FM |
1310 | * This is the record for the group leader. It shows the |
1311 | * group-wide total, not its individual thread total. | |
1da177e4 | 1312 | */ |
f06febc9 FM |
1313 | thread_group_cputime(p, &cputime); |
1314 | cputime_to_timeval(cputime.utime, &prstatus->pr_utime); | |
1315 | cputime_to_timeval(cputime.stime, &prstatus->pr_stime); | |
1da177e4 LT |
1316 | } else { |
1317 | cputime_to_timeval(p->utime, &prstatus->pr_utime); | |
1318 | cputime_to_timeval(p->stime, &prstatus->pr_stime); | |
1319 | } | |
1320 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); | |
1321 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); | |
1322 | } | |
1323 | ||
1324 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1325 | struct mm_struct *mm) | |
1326 | { | |
c69e8d9c | 1327 | const struct cred *cred; |
a84a5059 | 1328 | unsigned int i, len; |
1da177e4 LT |
1329 | |
1330 | /* first copy the parameters from user space */ | |
1331 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1332 | ||
1333 | len = mm->arg_end - mm->arg_start; | |
1334 | if (len >= ELF_PRARGSZ) | |
1335 | len = ELF_PRARGSZ-1; | |
1336 | if (copy_from_user(&psinfo->pr_psargs, | |
1337 | (const char __user *)mm->arg_start, len)) | |
1338 | return -EFAULT; | |
1339 | for(i = 0; i < len; i++) | |
1340 | if (psinfo->pr_psargs[i] == 0) | |
1341 | psinfo->pr_psargs[i] = ' '; | |
1342 | psinfo->pr_psargs[len] = 0; | |
1343 | ||
3b34fc58 ON |
1344 | rcu_read_lock(); |
1345 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1346 | rcu_read_unlock(); | |
b488893a | 1347 | psinfo->pr_pid = task_pid_vnr(p); |
b488893a PE |
1348 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1349 | psinfo->pr_sid = task_session_vnr(p); | |
1da177e4 LT |
1350 | |
1351 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1352 | psinfo->pr_state = i; | |
55148548 | 1353 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1da177e4 LT |
1354 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
1355 | psinfo->pr_nice = task_nice(p); | |
1356 | psinfo->pr_flag = p->flags; | |
c69e8d9c DH |
1357 | rcu_read_lock(); |
1358 | cred = __task_cred(p); | |
ebc887b2 EB |
1359 | SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); |
1360 | SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid)); | |
c69e8d9c | 1361 | rcu_read_unlock(); |
1da177e4 LT |
1362 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1363 | ||
1364 | return 0; | |
1365 | } | |
1366 | ||
3aba481f RM |
1367 | static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm) |
1368 | { | |
1369 | elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv; | |
1370 | int i = 0; | |
1371 | do | |
1372 | i += 2; | |
1373 | while (auxv[i - 2] != AT_NULL); | |
1374 | fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv); | |
1375 | } | |
1376 | ||
4206d3aa RM |
1377 | #ifdef CORE_DUMP_USE_REGSET |
1378 | #include <linux/regset.h> | |
1379 | ||
1380 | struct elf_thread_core_info { | |
1381 | struct elf_thread_core_info *next; | |
1382 | struct task_struct *task; | |
1383 | struct elf_prstatus prstatus; | |
1384 | struct memelfnote notes[0]; | |
1385 | }; | |
1386 | ||
1387 | struct elf_note_info { | |
1388 | struct elf_thread_core_info *thread; | |
1389 | struct memelfnote psinfo; | |
1390 | struct memelfnote auxv; | |
1391 | size_t size; | |
1392 | int thread_notes; | |
1393 | }; | |
1394 | ||
d31472b6 RM |
1395 | /* |
1396 | * When a regset has a writeback hook, we call it on each thread before | |
1397 | * dumping user memory. On register window machines, this makes sure the | |
1398 | * user memory backing the register data is up to date before we read it. | |
1399 | */ | |
1400 | static void do_thread_regset_writeback(struct task_struct *task, | |
1401 | const struct user_regset *regset) | |
1402 | { | |
1403 | if (regset->writeback) | |
1404 | regset->writeback(task, regset, 1); | |
1405 | } | |
1406 | ||
0953f65d L |
1407 | #ifndef PR_REG_SIZE |
1408 | #define PR_REG_SIZE(S) sizeof(S) | |
1409 | #endif | |
1410 | ||
1411 | #ifndef PRSTATUS_SIZE | |
1412 | #define PRSTATUS_SIZE(S) sizeof(S) | |
1413 | #endif | |
1414 | ||
1415 | #ifndef PR_REG_PTR | |
1416 | #define PR_REG_PTR(S) (&((S)->pr_reg)) | |
1417 | #endif | |
1418 | ||
1419 | #ifndef SET_PR_FPVALID | |
1420 | #define SET_PR_FPVALID(S, V) ((S)->pr_fpvalid = (V)) | |
1421 | #endif | |
1422 | ||
4206d3aa RM |
1423 | static int fill_thread_core_info(struct elf_thread_core_info *t, |
1424 | const struct user_regset_view *view, | |
1425 | long signr, size_t *total) | |
1426 | { | |
1427 | unsigned int i; | |
1428 | ||
1429 | /* | |
1430 | * NT_PRSTATUS is the one special case, because the regset data | |
1431 | * goes into the pr_reg field inside the note contents, rather | |
1432 | * than being the whole note contents. We fill the reset in here. | |
1433 | * We assume that regset 0 is NT_PRSTATUS. | |
1434 | */ | |
1435 | fill_prstatus(&t->prstatus, t->task, signr); | |
1436 | (void) view->regsets[0].get(t->task, &view->regsets[0], | |
0953f65d L |
1437 | 0, PR_REG_SIZE(t->prstatus.pr_reg), |
1438 | PR_REG_PTR(&t->prstatus), NULL); | |
4206d3aa RM |
1439 | |
1440 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, | |
0953f65d | 1441 | PRSTATUS_SIZE(t->prstatus), &t->prstatus); |
4206d3aa RM |
1442 | *total += notesize(&t->notes[0]); |
1443 | ||
d31472b6 RM |
1444 | do_thread_regset_writeback(t->task, &view->regsets[0]); |
1445 | ||
4206d3aa RM |
1446 | /* |
1447 | * Each other regset might generate a note too. For each regset | |
1448 | * that has no core_note_type or is inactive, we leave t->notes[i] | |
1449 | * all zero and we'll know to skip writing it later. | |
1450 | */ | |
1451 | for (i = 1; i < view->n; ++i) { | |
1452 | const struct user_regset *regset = &view->regsets[i]; | |
d31472b6 | 1453 | do_thread_regset_writeback(t->task, regset); |
c8e25258 | 1454 | if (regset->core_note_type && regset->get && |
4206d3aa RM |
1455 | (!regset->active || regset->active(t->task, regset))) { |
1456 | int ret; | |
1457 | size_t size = regset->n * regset->size; | |
1458 | void *data = kmalloc(size, GFP_KERNEL); | |
1459 | if (unlikely(!data)) | |
1460 | return 0; | |
1461 | ret = regset->get(t->task, regset, | |
1462 | 0, size, data, NULL); | |
1463 | if (unlikely(ret)) | |
1464 | kfree(data); | |
1465 | else { | |
1466 | if (regset->core_note_type != NT_PRFPREG) | |
1467 | fill_note(&t->notes[i], "LINUX", | |
1468 | regset->core_note_type, | |
1469 | size, data); | |
1470 | else { | |
0953f65d | 1471 | SET_PR_FPVALID(&t->prstatus, 1); |
4206d3aa RM |
1472 | fill_note(&t->notes[i], "CORE", |
1473 | NT_PRFPREG, size, data); | |
1474 | } | |
1475 | *total += notesize(&t->notes[i]); | |
1476 | } | |
1477 | } | |
1478 | } | |
1479 | ||
1480 | return 1; | |
1481 | } | |
1482 | ||
1483 | static int fill_note_info(struct elfhdr *elf, int phdrs, | |
1484 | struct elf_note_info *info, | |
1485 | long signr, struct pt_regs *regs) | |
1486 | { | |
1487 | struct task_struct *dump_task = current; | |
1488 | const struct user_regset_view *view = task_user_regset_view(dump_task); | |
1489 | struct elf_thread_core_info *t; | |
1490 | struct elf_prpsinfo *psinfo; | |
83914441 | 1491 | struct core_thread *ct; |
4206d3aa RM |
1492 | unsigned int i; |
1493 | ||
1494 | info->size = 0; | |
1495 | info->thread = NULL; | |
1496 | ||
1497 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
4206d3aa RM |
1498 | if (psinfo == NULL) |
1499 | return 0; | |
1500 | ||
e2dbe125 AW |
1501 | fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
1502 | ||
4206d3aa RM |
1503 | /* |
1504 | * Figure out how many notes we're going to need for each thread. | |
1505 | */ | |
1506 | info->thread_notes = 0; | |
1507 | for (i = 0; i < view->n; ++i) | |
1508 | if (view->regsets[i].core_note_type != 0) | |
1509 | ++info->thread_notes; | |
1510 | ||
1511 | /* | |
1512 | * Sanity check. We rely on regset 0 being in NT_PRSTATUS, | |
1513 | * since it is our one special case. | |
1514 | */ | |
1515 | if (unlikely(info->thread_notes == 0) || | |
1516 | unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) { | |
1517 | WARN_ON(1); | |
1518 | return 0; | |
1519 | } | |
1520 | ||
1521 | /* | |
1522 | * Initialize the ELF file header. | |
1523 | */ | |
1524 | fill_elf_header(elf, phdrs, | |
1525 | view->e_machine, view->e_flags, view->ei_osabi); | |
1526 | ||
1527 | /* | |
1528 | * Allocate a structure for each thread. | |
1529 | */ | |
83914441 ON |
1530 | for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) { |
1531 | t = kzalloc(offsetof(struct elf_thread_core_info, | |
1532 | notes[info->thread_notes]), | |
1533 | GFP_KERNEL); | |
1534 | if (unlikely(!t)) | |
1535 | return 0; | |
1536 | ||
1537 | t->task = ct->task; | |
1538 | if (ct->task == dump_task || !info->thread) { | |
1539 | t->next = info->thread; | |
1540 | info->thread = t; | |
1541 | } else { | |
1542 | /* | |
1543 | * Make sure to keep the original task at | |
1544 | * the head of the list. | |
1545 | */ | |
1546 | t->next = info->thread->next; | |
1547 | info->thread->next = t; | |
4206d3aa | 1548 | } |
83914441 | 1549 | } |
4206d3aa RM |
1550 | |
1551 | /* | |
1552 | * Now fill in each thread's information. | |
1553 | */ | |
1554 | for (t = info->thread; t != NULL; t = t->next) | |
1555 | if (!fill_thread_core_info(t, view, signr, &info->size)) | |
1556 | return 0; | |
1557 | ||
1558 | /* | |
1559 | * Fill in the two process-wide notes. | |
1560 | */ | |
1561 | fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm); | |
1562 | info->size += notesize(&info->psinfo); | |
1563 | ||
1564 | fill_auxv_note(&info->auxv, current->mm); | |
1565 | info->size += notesize(&info->auxv); | |
1566 | ||
1567 | return 1; | |
1568 | } | |
1569 | ||
1570 | static size_t get_note_info_size(struct elf_note_info *info) | |
1571 | { | |
1572 | return info->size; | |
1573 | } | |
1574 | ||
1575 | /* | |
1576 | * Write all the notes for each thread. When writing the first thread, the | |
1577 | * process-wide notes are interleaved after the first thread-specific note. | |
1578 | */ | |
1579 | static int write_note_info(struct elf_note_info *info, | |
1580 | struct file *file, loff_t *foffset) | |
1581 | { | |
1582 | bool first = 1; | |
1583 | struct elf_thread_core_info *t = info->thread; | |
1584 | ||
1585 | do { | |
1586 | int i; | |
1587 | ||
1588 | if (!writenote(&t->notes[0], file, foffset)) | |
1589 | return 0; | |
1590 | ||
1591 | if (first && !writenote(&info->psinfo, file, foffset)) | |
1592 | return 0; | |
1593 | if (first && !writenote(&info->auxv, file, foffset)) | |
1594 | return 0; | |
1595 | ||
1596 | for (i = 1; i < info->thread_notes; ++i) | |
1597 | if (t->notes[i].data && | |
1598 | !writenote(&t->notes[i], file, foffset)) | |
1599 | return 0; | |
1600 | ||
1601 | first = 0; | |
1602 | t = t->next; | |
1603 | } while (t); | |
1604 | ||
1605 | return 1; | |
1606 | } | |
1607 | ||
1608 | static void free_note_info(struct elf_note_info *info) | |
1609 | { | |
1610 | struct elf_thread_core_info *threads = info->thread; | |
1611 | while (threads) { | |
1612 | unsigned int i; | |
1613 | struct elf_thread_core_info *t = threads; | |
1614 | threads = t->next; | |
1615 | WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus); | |
1616 | for (i = 1; i < info->thread_notes; ++i) | |
1617 | kfree(t->notes[i].data); | |
1618 | kfree(t); | |
1619 | } | |
1620 | kfree(info->psinfo.data); | |
1621 | } | |
1622 | ||
1623 | #else | |
1624 | ||
1da177e4 LT |
1625 | /* Here is the structure in which status of each thread is captured. */ |
1626 | struct elf_thread_status | |
1627 | { | |
1628 | struct list_head list; | |
1629 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1630 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1631 | struct task_struct *thread; | |
1632 | #ifdef ELF_CORE_COPY_XFPREGS | |
5b20cd80 | 1633 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
1da177e4 LT |
1634 | #endif |
1635 | struct memelfnote notes[3]; | |
1636 | int num_notes; | |
1637 | }; | |
1638 | ||
1639 | /* | |
1640 | * In order to add the specific thread information for the elf file format, | |
f4e5cc2c JJ |
1641 | * we need to keep a linked list of every threads pr_status and then create |
1642 | * a single section for them in the final core file. | |
1da177e4 LT |
1643 | */ |
1644 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1645 | { | |
1646 | int sz = 0; | |
1647 | struct task_struct *p = t->thread; | |
1648 | t->num_notes = 0; | |
1649 | ||
1650 | fill_prstatus(&t->prstatus, p, signr); | |
1651 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1652 | ||
f4e5cc2c JJ |
1653 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
1654 | &(t->prstatus)); | |
1da177e4 LT |
1655 | t->num_notes++; |
1656 | sz += notesize(&t->notes[0]); | |
1657 | ||
f4e5cc2c JJ |
1658 | if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, |
1659 | &t->fpu))) { | |
1660 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1661 | &(t->fpu)); | |
1da177e4 LT |
1662 | t->num_notes++; |
1663 | sz += notesize(&t->notes[1]); | |
1664 | } | |
1665 | ||
1666 | #ifdef ELF_CORE_COPY_XFPREGS | |
1667 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
5b20cd80 MN |
1668 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1669 | sizeof(t->xfpu), &t->xfpu); | |
1da177e4 LT |
1670 | t->num_notes++; |
1671 | sz += notesize(&t->notes[2]); | |
1672 | } | |
1673 | #endif | |
1674 | return sz; | |
1675 | } | |
1676 | ||
3aba481f RM |
1677 | struct elf_note_info { |
1678 | struct memelfnote *notes; | |
1679 | struct elf_prstatus *prstatus; /* NT_PRSTATUS */ | |
1680 | struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */ | |
1681 | struct list_head thread_list; | |
1682 | elf_fpregset_t *fpu; | |
1683 | #ifdef ELF_CORE_COPY_XFPREGS | |
1684 | elf_fpxregset_t *xfpu; | |
1685 | #endif | |
1686 | int thread_status_size; | |
1687 | int numnote; | |
1688 | }; | |
1689 | ||
0cf062d0 | 1690 | static int elf_note_info_init(struct elf_note_info *info) |
3aba481f | 1691 | { |
0cf062d0 | 1692 | memset(info, 0, sizeof(*info)); |
3aba481f RM |
1693 | INIT_LIST_HEAD(&info->thread_list); |
1694 | ||
0cf062d0 AW |
1695 | /* Allocate space for six ELF notes */ |
1696 | info->notes = kmalloc(6 * sizeof(struct memelfnote), GFP_KERNEL); | |
3aba481f RM |
1697 | if (!info->notes) |
1698 | return 0; | |
1699 | info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL); | |
1700 | if (!info->psinfo) | |
0cf062d0 | 1701 | goto notes_free; |
3aba481f RM |
1702 | info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL); |
1703 | if (!info->prstatus) | |
0cf062d0 | 1704 | goto psinfo_free; |
3aba481f RM |
1705 | info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL); |
1706 | if (!info->fpu) | |
0cf062d0 | 1707 | goto prstatus_free; |
3aba481f RM |
1708 | #ifdef ELF_CORE_COPY_XFPREGS |
1709 | info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL); | |
1710 | if (!info->xfpu) | |
0cf062d0 | 1711 | goto fpu_free; |
3aba481f | 1712 | #endif |
0cf062d0 AW |
1713 | return 1; |
1714 | #ifdef ELF_CORE_COPY_XFPREGS | |
1715 | fpu_free: | |
1716 | kfree(info->fpu); | |
1717 | #endif | |
1718 | prstatus_free: | |
1719 | kfree(info->prstatus); | |
1720 | psinfo_free: | |
1721 | kfree(info->psinfo); | |
1722 | notes_free: | |
1723 | kfree(info->notes); | |
1724 | return 0; | |
1725 | } | |
1726 | ||
1727 | static int fill_note_info(struct elfhdr *elf, int phdrs, | |
1728 | struct elf_note_info *info, | |
1729 | long signr, struct pt_regs *regs) | |
1730 | { | |
1731 | struct list_head *t; | |
1732 | ||
1733 | if (!elf_note_info_init(info)) | |
1734 | return 0; | |
3aba481f | 1735 | |
3aba481f | 1736 | if (signr) { |
83914441 | 1737 | struct core_thread *ct; |
4220b7fe | 1738 | struct elf_thread_status *ets; |
83914441 ON |
1739 | |
1740 | for (ct = current->mm->core_state->dumper.next; | |
1741 | ct; ct = ct->next) { | |
1742 | ets = kzalloc(sizeof(*ets), GFP_KERNEL); | |
1743 | if (!ets) | |
1744 | return 0; | |
1745 | ||
1746 | ets->thread = ct->task; | |
1747 | list_add(&ets->list, &info->thread_list); | |
1748 | } | |
1749 | ||
3aba481f | 1750 | list_for_each(t, &info->thread_list) { |
3aba481f RM |
1751 | int sz; |
1752 | ||
4220b7fe WC |
1753 | ets = list_entry(t, struct elf_thread_status, list); |
1754 | sz = elf_dump_thread_status(signr, ets); | |
3aba481f RM |
1755 | info->thread_status_size += sz; |
1756 | } | |
1757 | } | |
1758 | /* now collect the dump for the current */ | |
1759 | memset(info->prstatus, 0, sizeof(*info->prstatus)); | |
1760 | fill_prstatus(info->prstatus, current, signr); | |
1761 | elf_core_copy_regs(&info->prstatus->pr_reg, regs); | |
1762 | ||
1763 | /* Set up header */ | |
1764 | fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS, ELF_OSABI); | |
1765 | ||
1766 | /* | |
1767 | * Set up the notes in similar form to SVR4 core dumps made | |
1768 | * with info from their /proc. | |
1769 | */ | |
1770 | ||
1771 | fill_note(info->notes + 0, "CORE", NT_PRSTATUS, | |
1772 | sizeof(*info->prstatus), info->prstatus); | |
1773 | fill_psinfo(info->psinfo, current->group_leader, current->mm); | |
1774 | fill_note(info->notes + 1, "CORE", NT_PRPSINFO, | |
1775 | sizeof(*info->psinfo), info->psinfo); | |
1776 | ||
1777 | info->numnote = 2; | |
1778 | ||
1779 | fill_auxv_note(&info->notes[info->numnote++], current->mm); | |
1780 | ||
1781 | /* Try to dump the FPU. */ | |
1782 | info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs, | |
1783 | info->fpu); | |
1784 | if (info->prstatus->pr_fpvalid) | |
1785 | fill_note(info->notes + info->numnote++, | |
1786 | "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu); | |
1787 | #ifdef ELF_CORE_COPY_XFPREGS | |
1788 | if (elf_core_copy_task_xfpregs(current, info->xfpu)) | |
1789 | fill_note(info->notes + info->numnote++, | |
1790 | "LINUX", ELF_CORE_XFPREG_TYPE, | |
1791 | sizeof(*info->xfpu), info->xfpu); | |
1792 | #endif | |
1793 | ||
1794 | return 1; | |
3aba481f RM |
1795 | } |
1796 | ||
1797 | static size_t get_note_info_size(struct elf_note_info *info) | |
1798 | { | |
1799 | int sz = 0; | |
1800 | int i; | |
1801 | ||
1802 | for (i = 0; i < info->numnote; i++) | |
1803 | sz += notesize(info->notes + i); | |
1804 | ||
1805 | sz += info->thread_status_size; | |
1806 | ||
1807 | return sz; | |
1808 | } | |
1809 | ||
1810 | static int write_note_info(struct elf_note_info *info, | |
1811 | struct file *file, loff_t *foffset) | |
1812 | { | |
1813 | int i; | |
1814 | struct list_head *t; | |
1815 | ||
1816 | for (i = 0; i < info->numnote; i++) | |
1817 | if (!writenote(info->notes + i, file, foffset)) | |
1818 | return 0; | |
1819 | ||
1820 | /* write out the thread status notes section */ | |
1821 | list_for_each(t, &info->thread_list) { | |
1822 | struct elf_thread_status *tmp = | |
1823 | list_entry(t, struct elf_thread_status, list); | |
1824 | ||
1825 | for (i = 0; i < tmp->num_notes; i++) | |
1826 | if (!writenote(&tmp->notes[i], file, foffset)) | |
1827 | return 0; | |
1828 | } | |
1829 | ||
1830 | return 1; | |
1831 | } | |
1832 | ||
1833 | static void free_note_info(struct elf_note_info *info) | |
1834 | { | |
1835 | while (!list_empty(&info->thread_list)) { | |
1836 | struct list_head *tmp = info->thread_list.next; | |
1837 | list_del(tmp); | |
1838 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
1839 | } | |
1840 | ||
1841 | kfree(info->prstatus); | |
1842 | kfree(info->psinfo); | |
1843 | kfree(info->notes); | |
1844 | kfree(info->fpu); | |
1845 | #ifdef ELF_CORE_COPY_XFPREGS | |
1846 | kfree(info->xfpu); | |
1847 | #endif | |
1848 | } | |
1849 | ||
4206d3aa RM |
1850 | #endif |
1851 | ||
f47aef55 RM |
1852 | static struct vm_area_struct *first_vma(struct task_struct *tsk, |
1853 | struct vm_area_struct *gate_vma) | |
1854 | { | |
1855 | struct vm_area_struct *ret = tsk->mm->mmap; | |
1856 | ||
1857 | if (ret) | |
1858 | return ret; | |
1859 | return gate_vma; | |
1860 | } | |
1861 | /* | |
1862 | * Helper function for iterating across a vma list. It ensures that the caller | |
1863 | * will visit `gate_vma' prior to terminating the search. | |
1864 | */ | |
1865 | static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma, | |
1866 | struct vm_area_struct *gate_vma) | |
1867 | { | |
1868 | struct vm_area_struct *ret; | |
1869 | ||
1870 | ret = this_vma->vm_next; | |
1871 | if (ret) | |
1872 | return ret; | |
1873 | if (this_vma == gate_vma) | |
1874 | return NULL; | |
1875 | return gate_vma; | |
1876 | } | |
1877 | ||
8d9032bb DH |
1878 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
1879 | elf_addr_t e_shoff, int segs) | |
1880 | { | |
1881 | elf->e_shoff = e_shoff; | |
1882 | elf->e_shentsize = sizeof(*shdr4extnum); | |
1883 | elf->e_shnum = 1; | |
1884 | elf->e_shstrndx = SHN_UNDEF; | |
1885 | ||
1886 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); | |
1887 | ||
1888 | shdr4extnum->sh_type = SHT_NULL; | |
1889 | shdr4extnum->sh_size = elf->e_shnum; | |
1890 | shdr4extnum->sh_link = elf->e_shstrndx; | |
1891 | shdr4extnum->sh_info = segs; | |
1892 | } | |
1893 | ||
1894 | static size_t elf_core_vma_data_size(struct vm_area_struct *gate_vma, | |
1895 | unsigned long mm_flags) | |
1896 | { | |
1897 | struct vm_area_struct *vma; | |
1898 | size_t size = 0; | |
1899 | ||
1900 | for (vma = first_vma(current, gate_vma); vma != NULL; | |
1901 | vma = next_vma(vma, gate_vma)) | |
1902 | size += vma_dump_size(vma, mm_flags); | |
1903 | return size; | |
1904 | } | |
1905 | ||
1da177e4 LT |
1906 | /* |
1907 | * Actual dumper | |
1908 | * | |
1909 | * This is a two-pass process; first we find the offsets of the bits, | |
1910 | * and then they are actually written out. If we run out of core limit | |
1911 | * we just truncate. | |
1912 | */ | |
f6151dfe | 1913 | static int elf_core_dump(struct coredump_params *cprm) |
1da177e4 | 1914 | { |
1da177e4 LT |
1915 | int has_dumped = 0; |
1916 | mm_segment_t fs; | |
1917 | int segs; | |
1918 | size_t size = 0; | |
f47aef55 | 1919 | struct vm_area_struct *vma, *gate_vma; |
1da177e4 | 1920 | struct elfhdr *elf = NULL; |
d025c9db | 1921 | loff_t offset = 0, dataoff, foffset; |
3aba481f | 1922 | struct elf_note_info info; |
93eb211e | 1923 | struct elf_phdr *phdr4note = NULL; |
8d9032bb DH |
1924 | struct elf_shdr *shdr4extnum = NULL; |
1925 | Elf_Half e_phnum; | |
1926 | elf_addr_t e_shoff; | |
1da177e4 LT |
1927 | |
1928 | /* | |
1929 | * We no longer stop all VM operations. | |
1930 | * | |
f4e5cc2c JJ |
1931 | * This is because those proceses that could possibly change map_count |
1932 | * or the mmap / vma pages are now blocked in do_exit on current | |
1933 | * finishing this core dump. | |
1da177e4 LT |
1934 | * |
1935 | * Only ptrace can touch these memory addresses, but it doesn't change | |
f4e5cc2c | 1936 | * the map_count or the pages allocated. So no possibility of crashing |
1da177e4 LT |
1937 | * exists while dumping the mm->vm_next areas to the core file. |
1938 | */ | |
1939 | ||
1940 | /* alloc memory for large data structures: too large to be on stack */ | |
1941 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
1942 | if (!elf) | |
5f719558 | 1943 | goto out; |
341c87bf KH |
1944 | /* |
1945 | * The number of segs are recored into ELF header as 16bit value. | |
1946 | * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here. | |
1947 | */ | |
1da177e4 | 1948 | segs = current->mm->map_count; |
1fcccbac | 1949 | segs += elf_core_extra_phdrs(); |
1da177e4 | 1950 | |
31db58b3 | 1951 | gate_vma = get_gate_vma(current->mm); |
f47aef55 RM |
1952 | if (gate_vma != NULL) |
1953 | segs++; | |
1954 | ||
8d9032bb DH |
1955 | /* for notes section */ |
1956 | segs++; | |
1957 | ||
1958 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid | |
1959 | * this, kernel supports extended numbering. Have a look at | |
1960 | * include/linux/elf.h for further information. */ | |
1961 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; | |
1962 | ||
1da177e4 | 1963 | /* |
3aba481f RM |
1964 | * Collect all the non-memory information about the process for the |
1965 | * notes. This also sets up the file header. | |
1da177e4 | 1966 | */ |
8d9032bb | 1967 | if (!fill_note_info(elf, e_phnum, &info, cprm->signr, cprm->regs)) |
3aba481f | 1968 | goto cleanup; |
1da177e4 | 1969 | |
3aba481f RM |
1970 | has_dumped = 1; |
1971 | current->flags |= PF_DUMPCORE; | |
1da177e4 LT |
1972 | |
1973 | fs = get_fs(); | |
1974 | set_fs(KERNEL_DS); | |
1975 | ||
1da177e4 | 1976 | offset += sizeof(*elf); /* Elf header */ |
8d9032bb | 1977 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
a7a0d86f | 1978 | foffset = offset; |
1da177e4 LT |
1979 | |
1980 | /* Write notes phdr entry */ | |
1981 | { | |
3aba481f | 1982 | size_t sz = get_note_info_size(&info); |
1da177e4 | 1983 | |
e5501492 | 1984 | sz += elf_coredump_extra_notes_size(); |
bf1ab978 | 1985 | |
93eb211e DH |
1986 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
1987 | if (!phdr4note) | |
088e7af7 | 1988 | goto end_coredump; |
93eb211e DH |
1989 | |
1990 | fill_elf_note_phdr(phdr4note, sz, offset); | |
1991 | offset += sz; | |
1da177e4 LT |
1992 | } |
1993 | ||
1da177e4 LT |
1994 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
1995 | ||
30736a4d | 1996 | offset += elf_core_vma_data_size(gate_vma, cprm->mm_flags); |
8d9032bb DH |
1997 | offset += elf_core_extra_data_size(); |
1998 | e_shoff = offset; | |
1999 | ||
2000 | if (e_phnum == PN_XNUM) { | |
2001 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); | |
2002 | if (!shdr4extnum) | |
2003 | goto end_coredump; | |
2004 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs); | |
2005 | } | |
2006 | ||
2007 | offset = dataoff; | |
2008 | ||
93eb211e DH |
2009 | size += sizeof(*elf); |
2010 | if (size > cprm->limit || !dump_write(cprm->file, elf, sizeof(*elf))) | |
2011 | goto end_coredump; | |
2012 | ||
2013 | size += sizeof(*phdr4note); | |
2014 | if (size > cprm->limit | |
2015 | || !dump_write(cprm->file, phdr4note, sizeof(*phdr4note))) | |
2016 | goto end_coredump; | |
2017 | ||
1da177e4 | 2018 | /* Write program headers for segments dump */ |
f47aef55 RM |
2019 | for (vma = first_vma(current, gate_vma); vma != NULL; |
2020 | vma = next_vma(vma, gate_vma)) { | |
1da177e4 | 2021 | struct elf_phdr phdr; |
1da177e4 LT |
2022 | |
2023 | phdr.p_type = PT_LOAD; | |
2024 | phdr.p_offset = offset; | |
2025 | phdr.p_vaddr = vma->vm_start; | |
2026 | phdr.p_paddr = 0; | |
30736a4d | 2027 | phdr.p_filesz = vma_dump_size(vma, cprm->mm_flags); |
82df3973 | 2028 | phdr.p_memsz = vma->vm_end - vma->vm_start; |
1da177e4 LT |
2029 | offset += phdr.p_filesz; |
2030 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
f4e5cc2c JJ |
2031 | if (vma->vm_flags & VM_WRITE) |
2032 | phdr.p_flags |= PF_W; | |
2033 | if (vma->vm_flags & VM_EXEC) | |
2034 | phdr.p_flags |= PF_X; | |
1da177e4 LT |
2035 | phdr.p_align = ELF_EXEC_PAGESIZE; |
2036 | ||
088e7af7 DH |
2037 | size += sizeof(phdr); |
2038 | if (size > cprm->limit | |
2039 | || !dump_write(cprm->file, &phdr, sizeof(phdr))) | |
2040 | goto end_coredump; | |
1da177e4 LT |
2041 | } |
2042 | ||
1fcccbac DH |
2043 | if (!elf_core_write_extra_phdrs(cprm->file, offset, &size, cprm->limit)) |
2044 | goto end_coredump; | |
1da177e4 LT |
2045 | |
2046 | /* write out the notes section */ | |
f6151dfe | 2047 | if (!write_note_info(&info, cprm->file, &foffset)) |
3aba481f | 2048 | goto end_coredump; |
1da177e4 | 2049 | |
f6151dfe | 2050 | if (elf_coredump_extra_notes_write(cprm->file, &foffset)) |
e5501492 | 2051 | goto end_coredump; |
bf1ab978 | 2052 | |
d025c9db | 2053 | /* Align to page */ |
f6151dfe | 2054 | if (!dump_seek(cprm->file, dataoff - foffset)) |
f3e8fccd | 2055 | goto end_coredump; |
1da177e4 | 2056 | |
f47aef55 RM |
2057 | for (vma = first_vma(current, gate_vma); vma != NULL; |
2058 | vma = next_vma(vma, gate_vma)) { | |
1da177e4 | 2059 | unsigned long addr; |
82df3973 | 2060 | unsigned long end; |
1da177e4 | 2061 | |
30736a4d | 2062 | end = vma->vm_start + vma_dump_size(vma, cprm->mm_flags); |
1da177e4 | 2063 | |
82df3973 | 2064 | for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) { |
f4e5cc2c | 2065 | struct page *page; |
f3e8fccd HD |
2066 | int stop; |
2067 | ||
2068 | page = get_dump_page(addr); | |
2069 | if (page) { | |
2070 | void *kaddr = kmap(page); | |
f6151dfe MH |
2071 | stop = ((size += PAGE_SIZE) > cprm->limit) || |
2072 | !dump_write(cprm->file, kaddr, | |
2073 | PAGE_SIZE); | |
f3e8fccd | 2074 | kunmap(page); |
1da177e4 | 2075 | page_cache_release(page); |
f3e8fccd | 2076 | } else |
f6151dfe | 2077 | stop = !dump_seek(cprm->file, PAGE_SIZE); |
f3e8fccd HD |
2078 | if (stop) |
2079 | goto end_coredump; | |
1da177e4 LT |
2080 | } |
2081 | } | |
2082 | ||
1fcccbac DH |
2083 | if (!elf_core_write_extra_data(cprm->file, &size, cprm->limit)) |
2084 | goto end_coredump; | |
1da177e4 | 2085 | |
8d9032bb DH |
2086 | if (e_phnum == PN_XNUM) { |
2087 | size += sizeof(*shdr4extnum); | |
2088 | if (size > cprm->limit | |
2089 | || !dump_write(cprm->file, shdr4extnum, | |
2090 | sizeof(*shdr4extnum))) | |
2091 | goto end_coredump; | |
2092 | } | |
2093 | ||
1da177e4 LT |
2094 | end_coredump: |
2095 | set_fs(fs); | |
2096 | ||
2097 | cleanup: | |
3aba481f | 2098 | free_note_info(&info); |
8d9032bb | 2099 | kfree(shdr4extnum); |
93eb211e | 2100 | kfree(phdr4note); |
5f719558 WC |
2101 | kfree(elf); |
2102 | out: | |
1da177e4 | 2103 | return has_dumped; |
1da177e4 LT |
2104 | } |
2105 | ||
698ba7b5 | 2106 | #endif /* CONFIG_ELF_CORE */ |
1da177e4 LT |
2107 | |
2108 | static int __init init_elf_binfmt(void) | |
2109 | { | |
8fc3dc5a AV |
2110 | register_binfmt(&elf_format); |
2111 | return 0; | |
1da177e4 LT |
2112 | } |
2113 | ||
2114 | static void __exit exit_elf_binfmt(void) | |
2115 | { | |
2116 | /* Remove the COFF and ELF loaders. */ | |
2117 | unregister_binfmt(&elf_format); | |
2118 | } | |
2119 | ||
2120 | core_initcall(init_elf_binfmt); | |
2121 | module_exit(exit_elf_binfmt); | |
2122 | MODULE_LICENSE("GPL"); |