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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/binfmt_elf.c | |
3 | * | |
4 | * These are the functions used to load ELF format executables as used | |
5 | * on SVr4 machines. Information on the format may be found in the book | |
6 | * "UNIX SYSTEM V RELEASE 4 Programmers Guide: Ansi C and Programming Support | |
7 | * Tools". | |
8 | * | |
9 | * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com). | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/fs.h> | |
1da177e4 LT |
15 | #include <linux/mm.h> |
16 | #include <linux/mman.h> | |
1da177e4 LT |
17 | #include <linux/errno.h> |
18 | #include <linux/signal.h> | |
19 | #include <linux/binfmts.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/file.h> | |
1da177e4 | 22 | #include <linux/slab.h> |
1da177e4 LT |
23 | #include <linux/personality.h> |
24 | #include <linux/elfcore.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/highuid.h> | |
1da177e4 LT |
27 | #include <linux/compiler.h> |
28 | #include <linux/highmem.h> | |
29 | #include <linux/pagemap.h> | |
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> | |
38 | ||
f4e5cc2c JJ |
39 | static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs); |
40 | static int load_elf_library(struct file *); | |
bb1ad820 AM |
41 | static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *, |
42 | int, int, unsigned long); | |
1da177e4 | 43 | |
1da177e4 LT |
44 | /* |
45 | * If we don't support core dumping, then supply a NULL so we | |
46 | * don't even try. | |
47 | */ | |
698ba7b5 | 48 | #ifdef CONFIG_ELF_CORE |
f6151dfe | 49 | static int elf_core_dump(struct coredump_params *cprm); |
1da177e4 LT |
50 | #else |
51 | #define elf_core_dump NULL | |
52 | #endif | |
53 | ||
54 | #if ELF_EXEC_PAGESIZE > PAGE_SIZE | |
f4e5cc2c | 55 | #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE |
1da177e4 | 56 | #else |
f4e5cc2c | 57 | #define ELF_MIN_ALIGN PAGE_SIZE |
1da177e4 LT |
58 | #endif |
59 | ||
60 | #ifndef ELF_CORE_EFLAGS | |
61 | #define ELF_CORE_EFLAGS 0 | |
62 | #endif | |
63 | ||
64 | #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1)) | |
65 | #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1)) | |
66 | #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1)) | |
67 | ||
68 | static struct linux_binfmt elf_format = { | |
f670d0ec MP |
69 | .module = THIS_MODULE, |
70 | .load_binary = load_elf_binary, | |
71 | .load_shlib = load_elf_library, | |
72 | .core_dump = elf_core_dump, | |
73 | .min_coredump = ELF_EXEC_PAGESIZE, | |
1da177e4 LT |
74 | }; |
75 | ||
d4e3cc38 | 76 | #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE) |
1da177e4 LT |
77 | |
78 | static int set_brk(unsigned long start, unsigned long end) | |
79 | { | |
80 | start = ELF_PAGEALIGN(start); | |
81 | end = ELF_PAGEALIGN(end); | |
82 | if (end > start) { | |
83 | unsigned long addr; | |
84 | down_write(¤t->mm->mmap_sem); | |
85 | addr = do_brk(start, end - start); | |
86 | up_write(¤t->mm->mmap_sem); | |
87 | if (BAD_ADDR(addr)) | |
88 | return addr; | |
89 | } | |
90 | current->mm->start_brk = current->mm->brk = end; | |
91 | return 0; | |
92 | } | |
93 | ||
1da177e4 LT |
94 | /* We need to explicitly zero any fractional pages |
95 | after the data section (i.e. bss). This would | |
96 | contain the junk from the file that should not | |
f4e5cc2c JJ |
97 | be in memory |
98 | */ | |
1da177e4 LT |
99 | static int padzero(unsigned long elf_bss) |
100 | { | |
101 | unsigned long nbyte; | |
102 | ||
103 | nbyte = ELF_PAGEOFFSET(elf_bss); | |
104 | if (nbyte) { | |
105 | nbyte = ELF_MIN_ALIGN - nbyte; | |
106 | if (clear_user((void __user *) elf_bss, nbyte)) | |
107 | return -EFAULT; | |
108 | } | |
109 | return 0; | |
110 | } | |
111 | ||
09c6dd3c | 112 | /* Let's use some macros to make this stack manipulation a little clearer */ |
1da177e4 LT |
113 | #ifdef CONFIG_STACK_GROWSUP |
114 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items)) | |
115 | #define STACK_ROUND(sp, items) \ | |
116 | ((15 + (unsigned long) ((sp) + (items))) &~ 15UL) | |
f4e5cc2c JJ |
117 | #define STACK_ALLOC(sp, len) ({ \ |
118 | elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \ | |
119 | old_sp; }) | |
1da177e4 LT |
120 | #else |
121 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items)) | |
122 | #define STACK_ROUND(sp, items) \ | |
123 | (((unsigned long) (sp - items)) &~ 15UL) | |
124 | #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; }) | |
125 | #endif | |
126 | ||
483fad1c NL |
127 | #ifndef ELF_BASE_PLATFORM |
128 | /* | |
129 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. | |
130 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value | |
131 | * will be copied to the user stack in the same manner as AT_PLATFORM. | |
132 | */ | |
133 | #define ELF_BASE_PLATFORM NULL | |
134 | #endif | |
135 | ||
1da177e4 | 136 | static int |
f4e5cc2c | 137 | create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec, |
d20894a2 | 138 | unsigned long load_addr, unsigned long interp_load_addr) |
1da177e4 LT |
139 | { |
140 | unsigned long p = bprm->p; | |
141 | int argc = bprm->argc; | |
142 | int envc = bprm->envc; | |
143 | elf_addr_t __user *argv; | |
144 | elf_addr_t __user *envp; | |
145 | elf_addr_t __user *sp; | |
146 | elf_addr_t __user *u_platform; | |
483fad1c | 147 | elf_addr_t __user *u_base_platform; |
f06295b4 | 148 | elf_addr_t __user *u_rand_bytes; |
1da177e4 | 149 | const char *k_platform = ELF_PLATFORM; |
483fad1c | 150 | const char *k_base_platform = ELF_BASE_PLATFORM; |
f06295b4 | 151 | unsigned char k_rand_bytes[16]; |
1da177e4 LT |
152 | int items; |
153 | elf_addr_t *elf_info; | |
154 | int ei_index = 0; | |
86a264ab | 155 | const struct cred *cred = current_cred(); |
b6a2fea3 | 156 | struct vm_area_struct *vma; |
1da177e4 | 157 | |
d68c9d6a FBH |
158 | /* |
159 | * In some cases (e.g. Hyper-Threading), we want to avoid L1 | |
160 | * evictions by the processes running on the same package. One | |
161 | * thing we can do is to shuffle the initial stack for them. | |
162 | */ | |
163 | ||
164 | p = arch_align_stack(p); | |
165 | ||
1da177e4 LT |
166 | /* |
167 | * If this architecture has a platform capability string, copy it | |
168 | * to userspace. In some cases (Sparc), this info is impossible | |
169 | * for userspace to get any other way, in others (i386) it is | |
170 | * merely difficult. | |
171 | */ | |
1da177e4 LT |
172 | u_platform = NULL; |
173 | if (k_platform) { | |
174 | size_t len = strlen(k_platform) + 1; | |
175 | ||
1da177e4 LT |
176 | u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); |
177 | if (__copy_to_user(u_platform, k_platform, len)) | |
178 | return -EFAULT; | |
179 | } | |
180 | ||
483fad1c NL |
181 | /* |
182 | * If this architecture has a "base" platform capability | |
183 | * string, copy it to userspace. | |
184 | */ | |
185 | u_base_platform = NULL; | |
186 | if (k_base_platform) { | |
187 | size_t len = strlen(k_base_platform) + 1; | |
188 | ||
189 | u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); | |
190 | if (__copy_to_user(u_base_platform, k_base_platform, len)) | |
191 | return -EFAULT; | |
192 | } | |
193 | ||
f06295b4 KC |
194 | /* |
195 | * Generate 16 random bytes for userspace PRNG seeding. | |
196 | */ | |
197 | get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes)); | |
198 | u_rand_bytes = (elf_addr_t __user *) | |
199 | STACK_ALLOC(p, sizeof(k_rand_bytes)); | |
200 | if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes))) | |
201 | return -EFAULT; | |
202 | ||
1da177e4 | 203 | /* Create the ELF interpreter info */ |
785d5570 | 204 | elf_info = (elf_addr_t *)current->mm->saved_auxv; |
4f9a58d7 | 205 | /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */ |
1da177e4 | 206 | #define NEW_AUX_ENT(id, val) \ |
f4e5cc2c | 207 | do { \ |
785d5570 JJ |
208 | elf_info[ei_index++] = id; \ |
209 | elf_info[ei_index++] = val; \ | |
f4e5cc2c | 210 | } while (0) |
1da177e4 LT |
211 | |
212 | #ifdef ARCH_DLINFO | |
213 | /* | |
214 | * ARCH_DLINFO must come first so PPC can do its special alignment of | |
215 | * AUXV. | |
4f9a58d7 OH |
216 | * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in |
217 | * ARCH_DLINFO changes | |
1da177e4 LT |
218 | */ |
219 | ARCH_DLINFO; | |
220 | #endif | |
221 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); | |
222 | NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE); | |
223 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
224 | NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff); | |
f4e5cc2c | 225 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
1da177e4 LT |
226 | NEW_AUX_ENT(AT_PHNUM, exec->e_phnum); |
227 | NEW_AUX_ENT(AT_BASE, interp_load_addr); | |
228 | NEW_AUX_ENT(AT_FLAGS, 0); | |
229 | NEW_AUX_ENT(AT_ENTRY, exec->e_entry); | |
86a264ab DH |
230 | NEW_AUX_ENT(AT_UID, cred->uid); |
231 | NEW_AUX_ENT(AT_EUID, cred->euid); | |
232 | NEW_AUX_ENT(AT_GID, cred->gid); | |
233 | NEW_AUX_ENT(AT_EGID, cred->egid); | |
785d5570 | 234 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
f06295b4 | 235 | NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes); |
65191087 | 236 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
1da177e4 | 237 | if (k_platform) { |
f4e5cc2c | 238 | NEW_AUX_ENT(AT_PLATFORM, |
785d5570 | 239 | (elf_addr_t)(unsigned long)u_platform); |
1da177e4 | 240 | } |
483fad1c NL |
241 | if (k_base_platform) { |
242 | NEW_AUX_ENT(AT_BASE_PLATFORM, | |
243 | (elf_addr_t)(unsigned long)u_base_platform); | |
244 | } | |
1da177e4 | 245 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
785d5570 | 246 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); |
1da177e4 LT |
247 | } |
248 | #undef NEW_AUX_ENT | |
249 | /* AT_NULL is zero; clear the rest too */ | |
250 | memset(&elf_info[ei_index], 0, | |
251 | sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]); | |
252 | ||
253 | /* And advance past the AT_NULL entry. */ | |
254 | ei_index += 2; | |
255 | ||
256 | sp = STACK_ADD(p, ei_index); | |
257 | ||
d20894a2 | 258 | items = (argc + 1) + (envc + 1) + 1; |
1da177e4 LT |
259 | bprm->p = STACK_ROUND(sp, items); |
260 | ||
261 | /* Point sp at the lowest address on the stack */ | |
262 | #ifdef CONFIG_STACK_GROWSUP | |
263 | sp = (elf_addr_t __user *)bprm->p - items - ei_index; | |
f4e5cc2c | 264 | bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */ |
1da177e4 LT |
265 | #else |
266 | sp = (elf_addr_t __user *)bprm->p; | |
267 | #endif | |
268 | ||
b6a2fea3 OW |
269 | |
270 | /* | |
271 | * Grow the stack manually; some architectures have a limit on how | |
272 | * far ahead a user-space access may be in order to grow the stack. | |
273 | */ | |
274 | vma = find_extend_vma(current->mm, bprm->p); | |
275 | if (!vma) | |
276 | return -EFAULT; | |
277 | ||
1da177e4 LT |
278 | /* Now, let's put argc (and argv, envp if appropriate) on the stack */ |
279 | if (__put_user(argc, sp++)) | |
280 | return -EFAULT; | |
d20894a2 AK |
281 | argv = sp; |
282 | envp = argv + argc + 1; | |
1da177e4 LT |
283 | |
284 | /* Populate argv and envp */ | |
a84a5059 | 285 | p = current->mm->arg_end = current->mm->arg_start; |
1da177e4 LT |
286 | while (argc-- > 0) { |
287 | size_t len; | |
841d5fb7 HC |
288 | if (__put_user((elf_addr_t)p, argv++)) |
289 | return -EFAULT; | |
b6a2fea3 OW |
290 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
291 | if (!len || len > MAX_ARG_STRLEN) | |
23c4971e | 292 | return -EINVAL; |
1da177e4 LT |
293 | p += len; |
294 | } | |
295 | if (__put_user(0, argv)) | |
296 | return -EFAULT; | |
297 | current->mm->arg_end = current->mm->env_start = p; | |
298 | while (envc-- > 0) { | |
299 | size_t len; | |
841d5fb7 HC |
300 | if (__put_user((elf_addr_t)p, envp++)) |
301 | return -EFAULT; | |
b6a2fea3 OW |
302 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
303 | if (!len || len > MAX_ARG_STRLEN) | |
23c4971e | 304 | return -EINVAL; |
1da177e4 LT |
305 | p += len; |
306 | } | |
307 | if (__put_user(0, envp)) | |
308 | return -EFAULT; | |
309 | current->mm->env_end = p; | |
310 | ||
311 | /* Put the elf_info on the stack in the right place. */ | |
312 | sp = (elf_addr_t __user *)envp + 1; | |
313 | if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t))) | |
314 | return -EFAULT; | |
315 | return 0; | |
316 | } | |
317 | ||
1da177e4 | 318 | static unsigned long elf_map(struct file *filep, unsigned long addr, |
cc503c1b JK |
319 | struct elf_phdr *eppnt, int prot, int type, |
320 | unsigned long total_size) | |
1da177e4 LT |
321 | { |
322 | unsigned long map_addr; | |
cc503c1b JK |
323 | unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr); |
324 | unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr); | |
325 | addr = ELF_PAGESTART(addr); | |
326 | size = ELF_PAGEALIGN(size); | |
1da177e4 | 327 | |
dda6ebde DG |
328 | /* mmap() will return -EINVAL if given a zero size, but a |
329 | * segment with zero filesize is perfectly valid */ | |
cc503c1b JK |
330 | if (!size) |
331 | return addr; | |
332 | ||
333 | down_write(¤t->mm->mmap_sem); | |
334 | /* | |
335 | * total_size is the size of the ELF (interpreter) image. | |
336 | * The _first_ mmap needs to know the full size, otherwise | |
337 | * randomization might put this image into an overlapping | |
338 | * position with the ELF binary image. (since size < total_size) | |
339 | * So we first map the 'big' image - and unmap the remainder at | |
340 | * the end. (which unmap is needed for ELF images with holes.) | |
341 | */ | |
342 | if (total_size) { | |
343 | total_size = ELF_PAGEALIGN(total_size); | |
344 | map_addr = do_mmap(filep, addr, total_size, prot, type, off); | |
345 | if (!BAD_ADDR(map_addr)) | |
346 | do_munmap(current->mm, map_addr+size, total_size-size); | |
347 | } else | |
348 | map_addr = do_mmap(filep, addr, size, prot, type, off); | |
349 | ||
1da177e4 LT |
350 | up_write(¤t->mm->mmap_sem); |
351 | return(map_addr); | |
352 | } | |
353 | ||
cc503c1b JK |
354 | static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr) |
355 | { | |
356 | int i, first_idx = -1, last_idx = -1; | |
357 | ||
358 | for (i = 0; i < nr; i++) { | |
359 | if (cmds[i].p_type == PT_LOAD) { | |
360 | last_idx = i; | |
361 | if (first_idx == -1) | |
362 | first_idx = i; | |
363 | } | |
364 | } | |
365 | if (first_idx == -1) | |
366 | return 0; | |
367 | ||
368 | return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz - | |
369 | ELF_PAGESTART(cmds[first_idx].p_vaddr); | |
370 | } | |
371 | ||
372 | ||
1da177e4 LT |
373 | /* This is much more generalized than the library routine read function, |
374 | so we keep this separate. Technically the library read function | |
375 | is only provided so that we can read a.out libraries that have | |
376 | an ELF header */ | |
377 | ||
f4e5cc2c | 378 | static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex, |
cc503c1b JK |
379 | struct file *interpreter, unsigned long *interp_map_addr, |
380 | unsigned long no_base) | |
1da177e4 LT |
381 | { |
382 | struct elf_phdr *elf_phdata; | |
383 | struct elf_phdr *eppnt; | |
384 | unsigned long load_addr = 0; | |
385 | int load_addr_set = 0; | |
386 | unsigned long last_bss = 0, elf_bss = 0; | |
387 | unsigned long error = ~0UL; | |
cc503c1b | 388 | unsigned long total_size; |
1da177e4 LT |
389 | int retval, i, size; |
390 | ||
391 | /* First of all, some simple consistency checks */ | |
392 | if (interp_elf_ex->e_type != ET_EXEC && | |
393 | interp_elf_ex->e_type != ET_DYN) | |
394 | goto out; | |
395 | if (!elf_check_arch(interp_elf_ex)) | |
396 | goto out; | |
397 | if (!interpreter->f_op || !interpreter->f_op->mmap) | |
398 | goto out; | |
399 | ||
400 | /* | |
401 | * If the size of this structure has changed, then punt, since | |
402 | * we will be doing the wrong thing. | |
403 | */ | |
404 | if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) | |
405 | goto out; | |
406 | if (interp_elf_ex->e_phnum < 1 || | |
407 | interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr)) | |
408 | goto out; | |
409 | ||
410 | /* Now read in all of the header information */ | |
1da177e4 LT |
411 | size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum; |
412 | if (size > ELF_MIN_ALIGN) | |
413 | goto out; | |
f4e5cc2c | 414 | elf_phdata = kmalloc(size, GFP_KERNEL); |
1da177e4 LT |
415 | if (!elf_phdata) |
416 | goto out; | |
417 | ||
f4e5cc2c | 418 | retval = kernel_read(interpreter, interp_elf_ex->e_phoff, |
f670d0ec | 419 | (char *)elf_phdata, size); |
1da177e4 LT |
420 | error = -EIO; |
421 | if (retval != size) { | |
422 | if (retval < 0) | |
423 | error = retval; | |
424 | goto out_close; | |
425 | } | |
426 | ||
cc503c1b JK |
427 | total_size = total_mapping_size(elf_phdata, interp_elf_ex->e_phnum); |
428 | if (!total_size) { | |
429 | error = -EINVAL; | |
430 | goto out_close; | |
431 | } | |
432 | ||
1da177e4 | 433 | eppnt = elf_phdata; |
f4e5cc2c JJ |
434 | for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) { |
435 | if (eppnt->p_type == PT_LOAD) { | |
436 | int elf_type = MAP_PRIVATE | MAP_DENYWRITE; | |
437 | int elf_prot = 0; | |
438 | unsigned long vaddr = 0; | |
439 | unsigned long k, map_addr; | |
440 | ||
441 | if (eppnt->p_flags & PF_R) | |
442 | elf_prot = PROT_READ; | |
443 | if (eppnt->p_flags & PF_W) | |
444 | elf_prot |= PROT_WRITE; | |
445 | if (eppnt->p_flags & PF_X) | |
446 | elf_prot |= PROT_EXEC; | |
447 | vaddr = eppnt->p_vaddr; | |
448 | if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) | |
449 | elf_type |= MAP_FIXED; | |
cc503c1b JK |
450 | else if (no_base && interp_elf_ex->e_type == ET_DYN) |
451 | load_addr = -vaddr; | |
f4e5cc2c JJ |
452 | |
453 | map_addr = elf_map(interpreter, load_addr + vaddr, | |
bb1ad820 | 454 | eppnt, elf_prot, elf_type, total_size); |
cc503c1b JK |
455 | total_size = 0; |
456 | if (!*interp_map_addr) | |
457 | *interp_map_addr = map_addr; | |
f4e5cc2c JJ |
458 | error = map_addr; |
459 | if (BAD_ADDR(map_addr)) | |
460 | goto out_close; | |
461 | ||
462 | if (!load_addr_set && | |
463 | interp_elf_ex->e_type == ET_DYN) { | |
464 | load_addr = map_addr - ELF_PAGESTART(vaddr); | |
465 | load_addr_set = 1; | |
466 | } | |
467 | ||
468 | /* | |
469 | * Check to see if the section's size will overflow the | |
470 | * allowed task size. Note that p_filesz must always be | |
471 | * <= p_memsize so it's only necessary to check p_memsz. | |
472 | */ | |
473 | k = load_addr + eppnt->p_vaddr; | |
ce51059b | 474 | if (BAD_ADDR(k) || |
f4e5cc2c JJ |
475 | eppnt->p_filesz > eppnt->p_memsz || |
476 | eppnt->p_memsz > TASK_SIZE || | |
477 | TASK_SIZE - eppnt->p_memsz < k) { | |
478 | error = -ENOMEM; | |
479 | goto out_close; | |
480 | } | |
481 | ||
482 | /* | |
483 | * Find the end of the file mapping for this phdr, and | |
484 | * keep track of the largest address we see for this. | |
485 | */ | |
486 | k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; | |
487 | if (k > elf_bss) | |
488 | elf_bss = k; | |
489 | ||
490 | /* | |
491 | * Do the same thing for the memory mapping - between | |
492 | * elf_bss and last_bss is the bss section. | |
493 | */ | |
494 | k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; | |
495 | if (k > last_bss) | |
496 | last_bss = k; | |
497 | } | |
1da177e4 LT |
498 | } |
499 | ||
752015d1 RM |
500 | if (last_bss > elf_bss) { |
501 | /* | |
502 | * Now fill out the bss section. First pad the last page up | |
503 | * to the page boundary, and then perform a mmap to make sure | |
504 | * that there are zero-mapped pages up to and including the | |
505 | * last bss page. | |
506 | */ | |
507 | if (padzero(elf_bss)) { | |
508 | error = -EFAULT; | |
509 | goto out_close; | |
510 | } | |
1da177e4 | 511 | |
752015d1 RM |
512 | /* What we have mapped so far */ |
513 | elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1); | |
1da177e4 | 514 | |
752015d1 | 515 | /* Map the last of the bss segment */ |
1da177e4 LT |
516 | down_write(¤t->mm->mmap_sem); |
517 | error = do_brk(elf_bss, last_bss - elf_bss); | |
518 | up_write(¤t->mm->mmap_sem); | |
519 | if (BAD_ADDR(error)) | |
520 | goto out_close; | |
521 | } | |
522 | ||
cc503c1b | 523 | error = load_addr; |
1da177e4 LT |
524 | |
525 | out_close: | |
526 | kfree(elf_phdata); | |
527 | out: | |
528 | return error; | |
529 | } | |
530 | ||
1da177e4 LT |
531 | /* |
532 | * These are the functions used to load ELF style executables and shared | |
533 | * libraries. There is no binary dependent code anywhere else. | |
534 | */ | |
535 | ||
536 | #define INTERPRETER_NONE 0 | |
1da177e4 LT |
537 | #define INTERPRETER_ELF 2 |
538 | ||
913bd906 | 539 | #ifndef STACK_RND_MASK |
d1cabd63 | 540 | #define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) /* 8MB of VA */ |
913bd906 | 541 | #endif |
1da177e4 LT |
542 | |
543 | static unsigned long randomize_stack_top(unsigned long stack_top) | |
544 | { | |
545 | unsigned int random_variable = 0; | |
546 | ||
c16b63e0 AK |
547 | if ((current->flags & PF_RANDOMIZE) && |
548 | !(current->personality & ADDR_NO_RANDOMIZE)) { | |
913bd906 AK |
549 | random_variable = get_random_int() & STACK_RND_MASK; |
550 | random_variable <<= PAGE_SHIFT; | |
551 | } | |
1da177e4 | 552 | #ifdef CONFIG_STACK_GROWSUP |
913bd906 | 553 | return PAGE_ALIGN(stack_top) + random_variable; |
1da177e4 | 554 | #else |
913bd906 | 555 | return PAGE_ALIGN(stack_top) - random_variable; |
1da177e4 LT |
556 | #endif |
557 | } | |
558 | ||
f4e5cc2c | 559 | static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs) |
1da177e4 LT |
560 | { |
561 | struct file *interpreter = NULL; /* to shut gcc up */ | |
562 | unsigned long load_addr = 0, load_bias = 0; | |
563 | int load_addr_set = 0; | |
564 | char * elf_interpreter = NULL; | |
1da177e4 | 565 | unsigned long error; |
f4e5cc2c | 566 | struct elf_phdr *elf_ppnt, *elf_phdata; |
1da177e4 | 567 | unsigned long elf_bss, elf_brk; |
1da177e4 LT |
568 | int retval, i; |
569 | unsigned int size; | |
cc503c1b JK |
570 | unsigned long elf_entry; |
571 | unsigned long interp_load_addr = 0; | |
1da177e4 | 572 | unsigned long start_code, end_code, start_data, end_data; |
1a530a6f | 573 | unsigned long reloc_func_desc __maybe_unused = 0; |
8de61e69 | 574 | int executable_stack = EXSTACK_DEFAULT; |
1da177e4 LT |
575 | unsigned long def_flags = 0; |
576 | struct { | |
577 | struct elfhdr elf_ex; | |
578 | struct elfhdr interp_elf_ex; | |
1da177e4 LT |
579 | } *loc; |
580 | ||
581 | loc = kmalloc(sizeof(*loc), GFP_KERNEL); | |
582 | if (!loc) { | |
583 | retval = -ENOMEM; | |
584 | goto out_ret; | |
585 | } | |
586 | ||
587 | /* Get the exec-header */ | |
f4e5cc2c | 588 | loc->elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4 LT |
589 | |
590 | retval = -ENOEXEC; | |
591 | /* First of all, some simple consistency checks */ | |
592 | if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
593 | goto out; | |
594 | ||
595 | if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN) | |
596 | goto out; | |
597 | if (!elf_check_arch(&loc->elf_ex)) | |
598 | goto out; | |
f670d0ec | 599 | if (!bprm->file->f_op || !bprm->file->f_op->mmap) |
1da177e4 LT |
600 | goto out; |
601 | ||
602 | /* Now read in all of the header information */ | |
1da177e4 LT |
603 | if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr)) |
604 | goto out; | |
605 | if (loc->elf_ex.e_phnum < 1 || | |
606 | loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr)) | |
607 | goto out; | |
608 | size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr); | |
609 | retval = -ENOMEM; | |
f4e5cc2c | 610 | elf_phdata = kmalloc(size, GFP_KERNEL); |
1da177e4 LT |
611 | if (!elf_phdata) |
612 | goto out; | |
613 | ||
f4e5cc2c JJ |
614 | retval = kernel_read(bprm->file, loc->elf_ex.e_phoff, |
615 | (char *)elf_phdata, size); | |
1da177e4 LT |
616 | if (retval != size) { |
617 | if (retval >= 0) | |
618 | retval = -EIO; | |
619 | goto out_free_ph; | |
620 | } | |
621 | ||
1da177e4 LT |
622 | elf_ppnt = elf_phdata; |
623 | elf_bss = 0; | |
624 | elf_brk = 0; | |
625 | ||
626 | start_code = ~0UL; | |
627 | end_code = 0; | |
628 | start_data = 0; | |
629 | end_data = 0; | |
630 | ||
631 | for (i = 0; i < loc->elf_ex.e_phnum; i++) { | |
632 | if (elf_ppnt->p_type == PT_INTERP) { | |
633 | /* This is the program interpreter used for | |
634 | * shared libraries - for now assume that this | |
635 | * is an a.out format binary | |
636 | */ | |
1da177e4 LT |
637 | retval = -ENOEXEC; |
638 | if (elf_ppnt->p_filesz > PATH_MAX || | |
639 | elf_ppnt->p_filesz < 2) | |
e7b9b550 | 640 | goto out_free_ph; |
1da177e4 LT |
641 | |
642 | retval = -ENOMEM; | |
792db3af | 643 | elf_interpreter = kmalloc(elf_ppnt->p_filesz, |
f4e5cc2c | 644 | GFP_KERNEL); |
1da177e4 | 645 | if (!elf_interpreter) |
e7b9b550 | 646 | goto out_free_ph; |
1da177e4 LT |
647 | |
648 | retval = kernel_read(bprm->file, elf_ppnt->p_offset, | |
f4e5cc2c JJ |
649 | elf_interpreter, |
650 | elf_ppnt->p_filesz); | |
1da177e4 LT |
651 | if (retval != elf_ppnt->p_filesz) { |
652 | if (retval >= 0) | |
653 | retval = -EIO; | |
654 | goto out_free_interp; | |
655 | } | |
656 | /* make sure path is NULL terminated */ | |
657 | retval = -ENOEXEC; | |
658 | if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0') | |
659 | goto out_free_interp; | |
660 | ||
1da177e4 LT |
661 | interpreter = open_exec(elf_interpreter); |
662 | retval = PTR_ERR(interpreter); | |
663 | if (IS_ERR(interpreter)) | |
664 | goto out_free_interp; | |
1fb84496 AD |
665 | |
666 | /* | |
667 | * If the binary is not readable then enforce | |
668 | * mm->dumpable = 0 regardless of the interpreter's | |
669 | * permissions. | |
670 | */ | |
1b5d783c | 671 | would_dump(bprm, interpreter); |
1fb84496 | 672 | |
f4e5cc2c JJ |
673 | retval = kernel_read(interpreter, 0, bprm->buf, |
674 | BINPRM_BUF_SIZE); | |
1da177e4 LT |
675 | if (retval != BINPRM_BUF_SIZE) { |
676 | if (retval >= 0) | |
677 | retval = -EIO; | |
678 | goto out_free_dentry; | |
679 | } | |
680 | ||
681 | /* Get the exec headers */ | |
f4e5cc2c | 682 | loc->interp_elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4 LT |
683 | break; |
684 | } | |
685 | elf_ppnt++; | |
686 | } | |
687 | ||
688 | elf_ppnt = elf_phdata; | |
689 | for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) | |
690 | if (elf_ppnt->p_type == PT_GNU_STACK) { | |
691 | if (elf_ppnt->p_flags & PF_X) | |
692 | executable_stack = EXSTACK_ENABLE_X; | |
693 | else | |
694 | executable_stack = EXSTACK_DISABLE_X; | |
695 | break; | |
696 | } | |
1da177e4 LT |
697 | |
698 | /* Some simple consistency checks for the interpreter */ | |
699 | if (elf_interpreter) { | |
1da177e4 | 700 | retval = -ELIBBAD; |
d20894a2 AK |
701 | /* Not an ELF interpreter */ |
702 | if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1da177e4 | 703 | goto out_free_dentry; |
1da177e4 | 704 | /* Verify the interpreter has a valid arch */ |
d20894a2 | 705 | if (!elf_check_arch(&loc->interp_elf_ex)) |
1da177e4 | 706 | goto out_free_dentry; |
1da177e4 LT |
707 | } |
708 | ||
1da177e4 LT |
709 | /* Flush all traces of the currently running executable */ |
710 | retval = flush_old_exec(bprm); | |
711 | if (retval) | |
712 | goto out_free_dentry; | |
713 | ||
1da177e4 | 714 | /* OK, This is the point of no return */ |
1da177e4 LT |
715 | current->flags &= ~PF_FORKNOEXEC; |
716 | current->mm->def_flags = def_flags; | |
717 | ||
718 | /* Do this immediately, since STACK_TOP as used in setup_arg_pages | |
719 | may depend on the personality. */ | |
0b592682 | 720 | SET_PERSONALITY(loc->elf_ex); |
1da177e4 LT |
721 | if (elf_read_implies_exec(loc->elf_ex, executable_stack)) |
722 | current->personality |= READ_IMPLIES_EXEC; | |
723 | ||
f4e5cc2c | 724 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
1da177e4 | 725 | current->flags |= PF_RANDOMIZE; |
221af7f8 LT |
726 | |
727 | setup_new_exec(bprm); | |
1da177e4 LT |
728 | |
729 | /* Do this so that we can load the interpreter, if need be. We will | |
730 | change some of these later */ | |
1da177e4 | 731 | current->mm->free_area_cache = current->mm->mmap_base; |
1363c3cd | 732 | current->mm->cached_hole_size = 0; |
1da177e4 LT |
733 | retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP), |
734 | executable_stack); | |
735 | if (retval < 0) { | |
736 | send_sig(SIGKILL, current, 0); | |
737 | goto out_free_dentry; | |
738 | } | |
739 | ||
1da177e4 LT |
740 | current->mm->start_stack = bprm->p; |
741 | ||
af901ca1 | 742 | /* Now we do a little grungy work by mmapping the ELF image into |
cc503c1b | 743 | the correct location in memory. */ |
f4e5cc2c JJ |
744 | for(i = 0, elf_ppnt = elf_phdata; |
745 | i < loc->elf_ex.e_phnum; i++, elf_ppnt++) { | |
1da177e4 LT |
746 | int elf_prot = 0, elf_flags; |
747 | unsigned long k, vaddr; | |
748 | ||
749 | if (elf_ppnt->p_type != PT_LOAD) | |
750 | continue; | |
751 | ||
752 | if (unlikely (elf_brk > elf_bss)) { | |
753 | unsigned long nbyte; | |
754 | ||
755 | /* There was a PT_LOAD segment with p_memsz > p_filesz | |
756 | before this one. Map anonymous pages, if needed, | |
757 | and clear the area. */ | |
f670d0ec MP |
758 | retval = set_brk(elf_bss + load_bias, |
759 | elf_brk + load_bias); | |
1da177e4 LT |
760 | if (retval) { |
761 | send_sig(SIGKILL, current, 0); | |
762 | goto out_free_dentry; | |
763 | } | |
764 | nbyte = ELF_PAGEOFFSET(elf_bss); | |
765 | if (nbyte) { | |
766 | nbyte = ELF_MIN_ALIGN - nbyte; | |
767 | if (nbyte > elf_brk - elf_bss) | |
768 | nbyte = elf_brk - elf_bss; | |
769 | if (clear_user((void __user *)elf_bss + | |
770 | load_bias, nbyte)) { | |
771 | /* | |
772 | * This bss-zeroing can fail if the ELF | |
f4e5cc2c | 773 | * file specifies odd protections. So |
1da177e4 LT |
774 | * we don't check the return value |
775 | */ | |
776 | } | |
777 | } | |
778 | } | |
779 | ||
f4e5cc2c JJ |
780 | if (elf_ppnt->p_flags & PF_R) |
781 | elf_prot |= PROT_READ; | |
782 | if (elf_ppnt->p_flags & PF_W) | |
783 | elf_prot |= PROT_WRITE; | |
784 | if (elf_ppnt->p_flags & PF_X) | |
785 | elf_prot |= PROT_EXEC; | |
1da177e4 | 786 | |
f4e5cc2c | 787 | elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE; |
1da177e4 LT |
788 | |
789 | vaddr = elf_ppnt->p_vaddr; | |
790 | if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) { | |
791 | elf_flags |= MAP_FIXED; | |
792 | } else if (loc->elf_ex.e_type == ET_DYN) { | |
f4e5cc2c JJ |
793 | /* Try and get dynamic programs out of the way of the |
794 | * default mmap base, as well as whatever program they | |
795 | * might try to exec. This is because the brk will | |
796 | * follow the loader, and is not movable. */ | |
e39f5602 | 797 | #ifdef CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE |
a3defbe5 JK |
798 | /* Memory randomization might have been switched off |
799 | * in runtime via sysctl. | |
800 | * If that is the case, retain the original non-zero | |
801 | * load_bias value in order to establish proper | |
802 | * non-randomized mappings. | |
803 | */ | |
804 | if (current->flags & PF_RANDOMIZE) | |
805 | load_bias = 0; | |
806 | else | |
807 | load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); | |
cc503c1b | 808 | #else |
90cb28e8 | 809 | load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); |
cc503c1b | 810 | #endif |
1da177e4 LT |
811 | } |
812 | ||
f4e5cc2c | 813 | error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, |
bb1ad820 | 814 | elf_prot, elf_flags, 0); |
1da177e4 LT |
815 | if (BAD_ADDR(error)) { |
816 | send_sig(SIGKILL, current, 0); | |
b140f251 AK |
817 | retval = IS_ERR((void *)error) ? |
818 | PTR_ERR((void*)error) : -EINVAL; | |
1da177e4 LT |
819 | goto out_free_dentry; |
820 | } | |
821 | ||
822 | if (!load_addr_set) { | |
823 | load_addr_set = 1; | |
824 | load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset); | |
825 | if (loc->elf_ex.e_type == ET_DYN) { | |
826 | load_bias += error - | |
827 | ELF_PAGESTART(load_bias + vaddr); | |
828 | load_addr += load_bias; | |
829 | reloc_func_desc = load_bias; | |
830 | } | |
831 | } | |
832 | k = elf_ppnt->p_vaddr; | |
f4e5cc2c JJ |
833 | if (k < start_code) |
834 | start_code = k; | |
835 | if (start_data < k) | |
836 | start_data = k; | |
1da177e4 LT |
837 | |
838 | /* | |
839 | * Check to see if the section's size will overflow the | |
840 | * allowed task size. Note that p_filesz must always be | |
841 | * <= p_memsz so it is only necessary to check p_memsz. | |
842 | */ | |
ce51059b | 843 | if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz || |
1da177e4 LT |
844 | elf_ppnt->p_memsz > TASK_SIZE || |
845 | TASK_SIZE - elf_ppnt->p_memsz < k) { | |
f4e5cc2c | 846 | /* set_brk can never work. Avoid overflows. */ |
1da177e4 | 847 | send_sig(SIGKILL, current, 0); |
b140f251 | 848 | retval = -EINVAL; |
1da177e4 LT |
849 | goto out_free_dentry; |
850 | } | |
851 | ||
852 | k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; | |
853 | ||
854 | if (k > elf_bss) | |
855 | elf_bss = k; | |
856 | if ((elf_ppnt->p_flags & PF_X) && end_code < k) | |
857 | end_code = k; | |
858 | if (end_data < k) | |
859 | end_data = k; | |
860 | k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; | |
861 | if (k > elf_brk) | |
862 | elf_brk = k; | |
863 | } | |
864 | ||
865 | loc->elf_ex.e_entry += load_bias; | |
866 | elf_bss += load_bias; | |
867 | elf_brk += load_bias; | |
868 | start_code += load_bias; | |
869 | end_code += load_bias; | |
870 | start_data += load_bias; | |
871 | end_data += load_bias; | |
872 | ||
873 | /* Calling set_brk effectively mmaps the pages that we need | |
874 | * for the bss and break sections. We must do this before | |
875 | * mapping in the interpreter, to make sure it doesn't wind | |
876 | * up getting placed where the bss needs to go. | |
877 | */ | |
878 | retval = set_brk(elf_bss, elf_brk); | |
879 | if (retval) { | |
880 | send_sig(SIGKILL, current, 0); | |
881 | goto out_free_dentry; | |
882 | } | |
6de50517 | 883 | if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) { |
1da177e4 LT |
884 | send_sig(SIGSEGV, current, 0); |
885 | retval = -EFAULT; /* Nobody gets to see this, but.. */ | |
886 | goto out_free_dentry; | |
887 | } | |
888 | ||
889 | if (elf_interpreter) { | |
d20894a2 AK |
890 | unsigned long uninitialized_var(interp_map_addr); |
891 | ||
892 | elf_entry = load_elf_interp(&loc->interp_elf_ex, | |
893 | interpreter, | |
894 | &interp_map_addr, | |
895 | load_bias); | |
896 | if (!IS_ERR((void *)elf_entry)) { | |
897 | /* | |
898 | * load_elf_interp() returns relocation | |
899 | * adjustment | |
900 | */ | |
901 | interp_load_addr = elf_entry; | |
902 | elf_entry += loc->interp_elf_ex.e_entry; | |
cc503c1b | 903 | } |
1da177e4 | 904 | if (BAD_ADDR(elf_entry)) { |
1da177e4 | 905 | force_sig(SIGSEGV, current); |
ce51059b CE |
906 | retval = IS_ERR((void *)elf_entry) ? |
907 | (int)elf_entry : -EINVAL; | |
1da177e4 LT |
908 | goto out_free_dentry; |
909 | } | |
910 | reloc_func_desc = interp_load_addr; | |
911 | ||
912 | allow_write_access(interpreter); | |
913 | fput(interpreter); | |
914 | kfree(elf_interpreter); | |
915 | } else { | |
916 | elf_entry = loc->elf_ex.e_entry; | |
5342fba5 | 917 | if (BAD_ADDR(elf_entry)) { |
ce51059b CE |
918 | force_sig(SIGSEGV, current); |
919 | retval = -EINVAL; | |
5342fba5 SS |
920 | goto out_free_dentry; |
921 | } | |
1da177e4 LT |
922 | } |
923 | ||
924 | kfree(elf_phdata); | |
925 | ||
1da177e4 LT |
926 | set_binfmt(&elf_format); |
927 | ||
547ee84c | 928 | #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
fc5243d9 | 929 | retval = arch_setup_additional_pages(bprm, !!elf_interpreter); |
547ee84c BH |
930 | if (retval < 0) { |
931 | send_sig(SIGKILL, current, 0); | |
18c8baff | 932 | goto out; |
547ee84c BH |
933 | } |
934 | #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */ | |
935 | ||
a6f76f23 | 936 | install_exec_creds(bprm); |
1da177e4 | 937 | current->flags &= ~PF_FORKNOEXEC; |
b6a2fea3 | 938 | retval = create_elf_tables(bprm, &loc->elf_ex, |
f4e5cc2c | 939 | load_addr, interp_load_addr); |
b6a2fea3 OW |
940 | if (retval < 0) { |
941 | send_sig(SIGKILL, current, 0); | |
942 | goto out; | |
943 | } | |
1da177e4 | 944 | /* N.B. passed_fileno might not be initialized? */ |
1da177e4 LT |
945 | current->mm->end_code = end_code; |
946 | current->mm->start_code = start_code; | |
947 | current->mm->start_data = start_data; | |
948 | current->mm->end_data = end_data; | |
949 | current->mm->start_stack = bprm->p; | |
950 | ||
c1d171a0 | 951 | #ifdef arch_randomize_brk |
4471a675 | 952 | if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) { |
c1d171a0 JK |
953 | current->mm->brk = current->mm->start_brk = |
954 | arch_randomize_brk(current->mm); | |
4471a675 JK |
955 | #ifdef CONFIG_COMPAT_BRK |
956 | current->brk_randomized = 1; | |
957 | #endif | |
958 | } | |
c1d171a0 JK |
959 | #endif |
960 | ||
1da177e4 LT |
961 | if (current->personality & MMAP_PAGE_ZERO) { |
962 | /* Why this, you ask??? Well SVr4 maps page 0 as read-only, | |
963 | and some applications "depend" upon this behavior. | |
964 | Since we do not have the power to recompile these, we | |
f4e5cc2c | 965 | emulate the SVr4 behavior. Sigh. */ |
1da177e4 LT |
966 | down_write(¤t->mm->mmap_sem); |
967 | error = do_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC, | |
968 | MAP_FIXED | MAP_PRIVATE, 0); | |
969 | up_write(¤t->mm->mmap_sem); | |
970 | } | |
971 | ||
972 | #ifdef ELF_PLAT_INIT | |
973 | /* | |
974 | * The ABI may specify that certain registers be set up in special | |
975 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
976 | * example. In addition, it may also specify (eg, PowerPC64 ELF) | |
977 | * that the e_entry field is the address of the function descriptor | |
978 | * for the startup routine, rather than the address of the startup | |
979 | * routine itself. This macro performs whatever initialization to | |
980 | * the regs structure is required as well as any relocations to the | |
981 | * function descriptor entries when executing dynamically links apps. | |
982 | */ | |
983 | ELF_PLAT_INIT(regs, reloc_func_desc); | |
984 | #endif | |
985 | ||
986 | start_thread(regs, elf_entry, bprm->p); | |
1da177e4 LT |
987 | retval = 0; |
988 | out: | |
989 | kfree(loc); | |
990 | out_ret: | |
991 | return retval; | |
992 | ||
993 | /* error cleanup */ | |
994 | out_free_dentry: | |
995 | allow_write_access(interpreter); | |
996 | if (interpreter) | |
997 | fput(interpreter); | |
998 | out_free_interp: | |
f99d49ad | 999 | kfree(elf_interpreter); |
1da177e4 LT |
1000 | out_free_ph: |
1001 | kfree(elf_phdata); | |
1002 | goto out; | |
1003 | } | |
1004 | ||
1005 | /* This is really simpleminded and specialized - we are loading an | |
1006 | a.out library that is given an ELF header. */ | |
1da177e4 LT |
1007 | static int load_elf_library(struct file *file) |
1008 | { | |
1009 | struct elf_phdr *elf_phdata; | |
1010 | struct elf_phdr *eppnt; | |
1011 | unsigned long elf_bss, bss, len; | |
1012 | int retval, error, i, j; | |
1013 | struct elfhdr elf_ex; | |
1014 | ||
1015 | error = -ENOEXEC; | |
f4e5cc2c | 1016 | retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex)); |
1da177e4 LT |
1017 | if (retval != sizeof(elf_ex)) |
1018 | goto out; | |
1019 | ||
1020 | if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1021 | goto out; | |
1022 | ||
1023 | /* First of all, some simple consistency checks */ | |
1024 | if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 || | |
f4e5cc2c | 1025 | !elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap) |
1da177e4 LT |
1026 | goto out; |
1027 | ||
1028 | /* Now read in all of the header information */ | |
1029 | ||
1030 | j = sizeof(struct elf_phdr) * elf_ex.e_phnum; | |
1031 | /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */ | |
1032 | ||
1033 | error = -ENOMEM; | |
1034 | elf_phdata = kmalloc(j, GFP_KERNEL); | |
1035 | if (!elf_phdata) | |
1036 | goto out; | |
1037 | ||
1038 | eppnt = elf_phdata; | |
1039 | error = -ENOEXEC; | |
1040 | retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j); | |
1041 | if (retval != j) | |
1042 | goto out_free_ph; | |
1043 | ||
1044 | for (j = 0, i = 0; i<elf_ex.e_phnum; i++) | |
1045 | if ((eppnt + i)->p_type == PT_LOAD) | |
1046 | j++; | |
1047 | if (j != 1) | |
1048 | goto out_free_ph; | |
1049 | ||
1050 | while (eppnt->p_type != PT_LOAD) | |
1051 | eppnt++; | |
1052 | ||
1053 | /* Now use mmap to map the library into memory. */ | |
1054 | down_write(¤t->mm->mmap_sem); | |
1055 | error = do_mmap(file, | |
1056 | ELF_PAGESTART(eppnt->p_vaddr), | |
1057 | (eppnt->p_filesz + | |
1058 | ELF_PAGEOFFSET(eppnt->p_vaddr)), | |
1059 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
1060 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, | |
1061 | (eppnt->p_offset - | |
1062 | ELF_PAGEOFFSET(eppnt->p_vaddr))); | |
1063 | up_write(¤t->mm->mmap_sem); | |
1064 | if (error != ELF_PAGESTART(eppnt->p_vaddr)) | |
1065 | goto out_free_ph; | |
1066 | ||
1067 | elf_bss = eppnt->p_vaddr + eppnt->p_filesz; | |
1068 | if (padzero(elf_bss)) { | |
1069 | error = -EFAULT; | |
1070 | goto out_free_ph; | |
1071 | } | |
1072 | ||
f4e5cc2c JJ |
1073 | len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + |
1074 | ELF_MIN_ALIGN - 1); | |
1da177e4 LT |
1075 | bss = eppnt->p_memsz + eppnt->p_vaddr; |
1076 | if (bss > len) { | |
1077 | down_write(¤t->mm->mmap_sem); | |
1078 | do_brk(len, bss - len); | |
1079 | up_write(¤t->mm->mmap_sem); | |
1080 | } | |
1081 | error = 0; | |
1082 | ||
1083 | out_free_ph: | |
1084 | kfree(elf_phdata); | |
1085 | out: | |
1086 | return error; | |
1087 | } | |
1088 | ||
698ba7b5 | 1089 | #ifdef CONFIG_ELF_CORE |
1da177e4 LT |
1090 | /* |
1091 | * ELF core dumper | |
1092 | * | |
1093 | * Modelled on fs/exec.c:aout_core_dump() | |
1094 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1095 | */ | |
1da177e4 LT |
1096 | |
1097 | /* | |
82df3973 | 1098 | * Decide what to dump of a segment, part, all or none. |
1da177e4 | 1099 | */ |
82df3973 RM |
1100 | static unsigned long vma_dump_size(struct vm_area_struct *vma, |
1101 | unsigned long mm_flags) | |
1da177e4 | 1102 | { |
e575f111 KM |
1103 | #define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type)) |
1104 | ||
e5b97dde RM |
1105 | /* The vma can be set up to tell us the answer directly. */ |
1106 | if (vma->vm_flags & VM_ALWAYSDUMP) | |
82df3973 | 1107 | goto whole; |
e5b97dde | 1108 | |
e575f111 KM |
1109 | /* Hugetlb memory check */ |
1110 | if (vma->vm_flags & VM_HUGETLB) { | |
1111 | if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED)) | |
1112 | goto whole; | |
1113 | if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE)) | |
1114 | goto whole; | |
1115 | } | |
1116 | ||
1da177e4 LT |
1117 | /* Do not dump I/O mapped devices or special mappings */ |
1118 | if (vma->vm_flags & (VM_IO | VM_RESERVED)) | |
1119 | return 0; | |
1120 | ||
a1b59e80 KH |
1121 | /* By default, dump shared memory if mapped from an anonymous file. */ |
1122 | if (vma->vm_flags & VM_SHARED) { | |
82df3973 RM |
1123 | if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0 ? |
1124 | FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED)) | |
1125 | goto whole; | |
1126 | return 0; | |
a1b59e80 | 1127 | } |
1da177e4 | 1128 | |
82df3973 RM |
1129 | /* Dump segments that have been written to. */ |
1130 | if (vma->anon_vma && FILTER(ANON_PRIVATE)) | |
1131 | goto whole; | |
1132 | if (vma->vm_file == NULL) | |
1133 | return 0; | |
1da177e4 | 1134 | |
82df3973 RM |
1135 | if (FILTER(MAPPED_PRIVATE)) |
1136 | goto whole; | |
1137 | ||
1138 | /* | |
1139 | * If this looks like the beginning of a DSO or executable mapping, | |
1140 | * check for an ELF header. If we find one, dump the first page to | |
1141 | * aid in determining what was mapped here. | |
1142 | */ | |
92dc07b1 RM |
1143 | if (FILTER(ELF_HEADERS) && |
1144 | vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) { | |
82df3973 RM |
1145 | u32 __user *header = (u32 __user *) vma->vm_start; |
1146 | u32 word; | |
92dc07b1 | 1147 | mm_segment_t fs = get_fs(); |
82df3973 RM |
1148 | /* |
1149 | * Doing it this way gets the constant folded by GCC. | |
1150 | */ | |
1151 | union { | |
1152 | u32 cmp; | |
1153 | char elfmag[SELFMAG]; | |
1154 | } magic; | |
1155 | BUILD_BUG_ON(SELFMAG != sizeof word); | |
1156 | magic.elfmag[EI_MAG0] = ELFMAG0; | |
1157 | magic.elfmag[EI_MAG1] = ELFMAG1; | |
1158 | magic.elfmag[EI_MAG2] = ELFMAG2; | |
1159 | magic.elfmag[EI_MAG3] = ELFMAG3; | |
92dc07b1 RM |
1160 | /* |
1161 | * Switch to the user "segment" for get_user(), | |
1162 | * then put back what elf_core_dump() had in place. | |
1163 | */ | |
1164 | set_fs(USER_DS); | |
1165 | if (unlikely(get_user(word, header))) | |
1166 | word = 0; | |
1167 | set_fs(fs); | |
1168 | if (word == magic.cmp) | |
82df3973 RM |
1169 | return PAGE_SIZE; |
1170 | } | |
1171 | ||
1172 | #undef FILTER | |
1173 | ||
1174 | return 0; | |
1175 | ||
1176 | whole: | |
1177 | return vma->vm_end - vma->vm_start; | |
1da177e4 LT |
1178 | } |
1179 | ||
1da177e4 LT |
1180 | /* An ELF note in memory */ |
1181 | struct memelfnote | |
1182 | { | |
1183 | const char *name; | |
1184 | int type; | |
1185 | unsigned int datasz; | |
1186 | void *data; | |
1187 | }; | |
1188 | ||
1189 | static int notesize(struct memelfnote *en) | |
1190 | { | |
1191 | int sz; | |
1192 | ||
1193 | sz = sizeof(struct elf_note); | |
1194 | sz += roundup(strlen(en->name) + 1, 4); | |
1195 | sz += roundup(en->datasz, 4); | |
1196 | ||
1197 | return sz; | |
1198 | } | |
1199 | ||
d025c9db AK |
1200 | #define DUMP_WRITE(addr, nr, foffset) \ |
1201 | do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0) | |
1da177e4 | 1202 | |
d025c9db | 1203 | static int alignfile(struct file *file, loff_t *foffset) |
1da177e4 | 1204 | { |
a7a0d86f | 1205 | static const char buf[4] = { 0, }; |
d025c9db AK |
1206 | DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset); |
1207 | return 1; | |
1208 | } | |
1da177e4 | 1209 | |
d025c9db AK |
1210 | static int writenote(struct memelfnote *men, struct file *file, |
1211 | loff_t *foffset) | |
1212 | { | |
1213 | struct elf_note en; | |
1da177e4 LT |
1214 | en.n_namesz = strlen(men->name) + 1; |
1215 | en.n_descsz = men->datasz; | |
1216 | en.n_type = men->type; | |
1217 | ||
d025c9db AK |
1218 | DUMP_WRITE(&en, sizeof(en), foffset); |
1219 | DUMP_WRITE(men->name, en.n_namesz, foffset); | |
1220 | if (!alignfile(file, foffset)) | |
1221 | return 0; | |
1222 | DUMP_WRITE(men->data, men->datasz, foffset); | |
1223 | if (!alignfile(file, foffset)) | |
1224 | return 0; | |
1da177e4 LT |
1225 | |
1226 | return 1; | |
1227 | } | |
1228 | #undef DUMP_WRITE | |
1da177e4 | 1229 | |
3aba481f RM |
1230 | static void fill_elf_header(struct elfhdr *elf, int segs, |
1231 | u16 machine, u32 flags, u8 osabi) | |
1da177e4 | 1232 | { |
6970c8ef CG |
1233 | memset(elf, 0, sizeof(*elf)); |
1234 | ||
1da177e4 LT |
1235 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
1236 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1237 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1238 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1239 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1da177e4 LT |
1240 | |
1241 | elf->e_type = ET_CORE; | |
3aba481f | 1242 | elf->e_machine = machine; |
1da177e4 | 1243 | elf->e_version = EV_CURRENT; |
1da177e4 | 1244 | elf->e_phoff = sizeof(struct elfhdr); |
3aba481f | 1245 | elf->e_flags = flags; |
1da177e4 LT |
1246 | elf->e_ehsize = sizeof(struct elfhdr); |
1247 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1248 | elf->e_phnum = segs; | |
6970c8ef | 1249 | |
1da177e4 LT |
1250 | return; |
1251 | } | |
1252 | ||
8d6b5eee | 1253 | static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1da177e4 LT |
1254 | { |
1255 | phdr->p_type = PT_NOTE; | |
1256 | phdr->p_offset = offset; | |
1257 | phdr->p_vaddr = 0; | |
1258 | phdr->p_paddr = 0; | |
1259 | phdr->p_filesz = sz; | |
1260 | phdr->p_memsz = 0; | |
1261 | phdr->p_flags = 0; | |
1262 | phdr->p_align = 0; | |
1263 | return; | |
1264 | } | |
1265 | ||
1266 | static void fill_note(struct memelfnote *note, const char *name, int type, | |
1267 | unsigned int sz, void *data) | |
1268 | { | |
1269 | note->name = name; | |
1270 | note->type = type; | |
1271 | note->datasz = sz; | |
1272 | note->data = data; | |
1273 | return; | |
1274 | } | |
1275 | ||
1276 | /* | |
f4e5cc2c JJ |
1277 | * fill up all the fields in prstatus from the given task struct, except |
1278 | * registers which need to be filled up separately. | |
1da177e4 LT |
1279 | */ |
1280 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
f4e5cc2c | 1281 | struct task_struct *p, long signr) |
1da177e4 LT |
1282 | { |
1283 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1284 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1285 | prstatus->pr_sighold = p->blocked.sig[0]; | |
3b34fc58 ON |
1286 | rcu_read_lock(); |
1287 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1288 | rcu_read_unlock(); | |
b488893a | 1289 | prstatus->pr_pid = task_pid_vnr(p); |
b488893a PE |
1290 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1291 | prstatus->pr_sid = task_session_vnr(p); | |
1da177e4 | 1292 | if (thread_group_leader(p)) { |
f06febc9 FM |
1293 | struct task_cputime cputime; |
1294 | ||
1da177e4 | 1295 | /* |
f06febc9 FM |
1296 | * This is the record for the group leader. It shows the |
1297 | * group-wide total, not its individual thread total. | |
1da177e4 | 1298 | */ |
f06febc9 FM |
1299 | thread_group_cputime(p, &cputime); |
1300 | cputime_to_timeval(cputime.utime, &prstatus->pr_utime); | |
1301 | cputime_to_timeval(cputime.stime, &prstatus->pr_stime); | |
1da177e4 LT |
1302 | } else { |
1303 | cputime_to_timeval(p->utime, &prstatus->pr_utime); | |
1304 | cputime_to_timeval(p->stime, &prstatus->pr_stime); | |
1305 | } | |
1306 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); | |
1307 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); | |
1308 | } | |
1309 | ||
1310 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1311 | struct mm_struct *mm) | |
1312 | { | |
c69e8d9c | 1313 | const struct cred *cred; |
a84a5059 | 1314 | unsigned int i, len; |
1da177e4 LT |
1315 | |
1316 | /* first copy the parameters from user space */ | |
1317 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1318 | ||
1319 | len = mm->arg_end - mm->arg_start; | |
1320 | if (len >= ELF_PRARGSZ) | |
1321 | len = ELF_PRARGSZ-1; | |
1322 | if (copy_from_user(&psinfo->pr_psargs, | |
1323 | (const char __user *)mm->arg_start, len)) | |
1324 | return -EFAULT; | |
1325 | for(i = 0; i < len; i++) | |
1326 | if (psinfo->pr_psargs[i] == 0) | |
1327 | psinfo->pr_psargs[i] = ' '; | |
1328 | psinfo->pr_psargs[len] = 0; | |
1329 | ||
3b34fc58 ON |
1330 | rcu_read_lock(); |
1331 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1332 | rcu_read_unlock(); | |
b488893a | 1333 | psinfo->pr_pid = task_pid_vnr(p); |
b488893a PE |
1334 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1335 | psinfo->pr_sid = task_session_vnr(p); | |
1da177e4 LT |
1336 | |
1337 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1338 | psinfo->pr_state = i; | |
55148548 | 1339 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1da177e4 LT |
1340 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
1341 | psinfo->pr_nice = task_nice(p); | |
1342 | psinfo->pr_flag = p->flags; | |
c69e8d9c DH |
1343 | rcu_read_lock(); |
1344 | cred = __task_cred(p); | |
1345 | SET_UID(psinfo->pr_uid, cred->uid); | |
1346 | SET_GID(psinfo->pr_gid, cred->gid); | |
1347 | rcu_read_unlock(); | |
1da177e4 LT |
1348 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1349 | ||
1350 | return 0; | |
1351 | } | |
1352 | ||
3aba481f RM |
1353 | static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm) |
1354 | { | |
1355 | elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv; | |
1356 | int i = 0; | |
1357 | do | |
1358 | i += 2; | |
1359 | while (auxv[i - 2] != AT_NULL); | |
1360 | fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv); | |
1361 | } | |
1362 | ||
4206d3aa RM |
1363 | #ifdef CORE_DUMP_USE_REGSET |
1364 | #include <linux/regset.h> | |
1365 | ||
1366 | struct elf_thread_core_info { | |
1367 | struct elf_thread_core_info *next; | |
1368 | struct task_struct *task; | |
1369 | struct elf_prstatus prstatus; | |
1370 | struct memelfnote notes[0]; | |
1371 | }; | |
1372 | ||
1373 | struct elf_note_info { | |
1374 | struct elf_thread_core_info *thread; | |
1375 | struct memelfnote psinfo; | |
1376 | struct memelfnote auxv; | |
1377 | size_t size; | |
1378 | int thread_notes; | |
1379 | }; | |
1380 | ||
d31472b6 RM |
1381 | /* |
1382 | * When a regset has a writeback hook, we call it on each thread before | |
1383 | * dumping user memory. On register window machines, this makes sure the | |
1384 | * user memory backing the register data is up to date before we read it. | |
1385 | */ | |
1386 | static void do_thread_regset_writeback(struct task_struct *task, | |
1387 | const struct user_regset *regset) | |
1388 | { | |
1389 | if (regset->writeback) | |
1390 | regset->writeback(task, regset, 1); | |
1391 | } | |
1392 | ||
0953f65d L |
1393 | #ifndef PR_REG_SIZE |
1394 | #define PR_REG_SIZE(S) sizeof(S) | |
1395 | #endif | |
1396 | ||
1397 | #ifndef PRSTATUS_SIZE | |
1398 | #define PRSTATUS_SIZE(S) sizeof(S) | |
1399 | #endif | |
1400 | ||
1401 | #ifndef PR_REG_PTR | |
1402 | #define PR_REG_PTR(S) (&((S)->pr_reg)) | |
1403 | #endif | |
1404 | ||
1405 | #ifndef SET_PR_FPVALID | |
1406 | #define SET_PR_FPVALID(S, V) ((S)->pr_fpvalid = (V)) | |
1407 | #endif | |
1408 | ||
4206d3aa RM |
1409 | static int fill_thread_core_info(struct elf_thread_core_info *t, |
1410 | const struct user_regset_view *view, | |
1411 | long signr, size_t *total) | |
1412 | { | |
1413 | unsigned int i; | |
1414 | ||
1415 | /* | |
1416 | * NT_PRSTATUS is the one special case, because the regset data | |
1417 | * goes into the pr_reg field inside the note contents, rather | |
1418 | * than being the whole note contents. We fill the reset in here. | |
1419 | * We assume that regset 0 is NT_PRSTATUS. | |
1420 | */ | |
1421 | fill_prstatus(&t->prstatus, t->task, signr); | |
1422 | (void) view->regsets[0].get(t->task, &view->regsets[0], | |
0953f65d L |
1423 | 0, PR_REG_SIZE(t->prstatus.pr_reg), |
1424 | PR_REG_PTR(&t->prstatus), NULL); | |
4206d3aa RM |
1425 | |
1426 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, | |
0953f65d | 1427 | PRSTATUS_SIZE(t->prstatus), &t->prstatus); |
4206d3aa RM |
1428 | *total += notesize(&t->notes[0]); |
1429 | ||
d31472b6 RM |
1430 | do_thread_regset_writeback(t->task, &view->regsets[0]); |
1431 | ||
4206d3aa RM |
1432 | /* |
1433 | * Each other regset might generate a note too. For each regset | |
1434 | * that has no core_note_type or is inactive, we leave t->notes[i] | |
1435 | * all zero and we'll know to skip writing it later. | |
1436 | */ | |
1437 | for (i = 1; i < view->n; ++i) { | |
1438 | const struct user_regset *regset = &view->regsets[i]; | |
d31472b6 | 1439 | do_thread_regset_writeback(t->task, regset); |
4206d3aa RM |
1440 | if (regset->core_note_type && |
1441 | (!regset->active || regset->active(t->task, regset))) { | |
1442 | int ret; | |
1443 | size_t size = regset->n * regset->size; | |
1444 | void *data = kmalloc(size, GFP_KERNEL); | |
1445 | if (unlikely(!data)) | |
1446 | return 0; | |
1447 | ret = regset->get(t->task, regset, | |
1448 | 0, size, data, NULL); | |
1449 | if (unlikely(ret)) | |
1450 | kfree(data); | |
1451 | else { | |
1452 | if (regset->core_note_type != NT_PRFPREG) | |
1453 | fill_note(&t->notes[i], "LINUX", | |
1454 | regset->core_note_type, | |
1455 | size, data); | |
1456 | else { | |
0953f65d | 1457 | SET_PR_FPVALID(&t->prstatus, 1); |
4206d3aa RM |
1458 | fill_note(&t->notes[i], "CORE", |
1459 | NT_PRFPREG, size, data); | |
1460 | } | |
1461 | *total += notesize(&t->notes[i]); | |
1462 | } | |
1463 | } | |
1464 | } | |
1465 | ||
1466 | return 1; | |
1467 | } | |
1468 | ||
1469 | static int fill_note_info(struct elfhdr *elf, int phdrs, | |
1470 | struct elf_note_info *info, | |
1471 | long signr, struct pt_regs *regs) | |
1472 | { | |
1473 | struct task_struct *dump_task = current; | |
1474 | const struct user_regset_view *view = task_user_regset_view(dump_task); | |
1475 | struct elf_thread_core_info *t; | |
1476 | struct elf_prpsinfo *psinfo; | |
83914441 | 1477 | struct core_thread *ct; |
4206d3aa RM |
1478 | unsigned int i; |
1479 | ||
1480 | info->size = 0; | |
1481 | info->thread = NULL; | |
1482 | ||
1483 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
4206d3aa RM |
1484 | if (psinfo == NULL) |
1485 | return 0; | |
1486 | ||
e2dbe125 AW |
1487 | fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
1488 | ||
4206d3aa RM |
1489 | /* |
1490 | * Figure out how many notes we're going to need for each thread. | |
1491 | */ | |
1492 | info->thread_notes = 0; | |
1493 | for (i = 0; i < view->n; ++i) | |
1494 | if (view->regsets[i].core_note_type != 0) | |
1495 | ++info->thread_notes; | |
1496 | ||
1497 | /* | |
1498 | * Sanity check. We rely on regset 0 being in NT_PRSTATUS, | |
1499 | * since it is our one special case. | |
1500 | */ | |
1501 | if (unlikely(info->thread_notes == 0) || | |
1502 | unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) { | |
1503 | WARN_ON(1); | |
1504 | return 0; | |
1505 | } | |
1506 | ||
1507 | /* | |
1508 | * Initialize the ELF file header. | |
1509 | */ | |
1510 | fill_elf_header(elf, phdrs, | |
1511 | view->e_machine, view->e_flags, view->ei_osabi); | |
1512 | ||
1513 | /* | |
1514 | * Allocate a structure for each thread. | |
1515 | */ | |
83914441 ON |
1516 | for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) { |
1517 | t = kzalloc(offsetof(struct elf_thread_core_info, | |
1518 | notes[info->thread_notes]), | |
1519 | GFP_KERNEL); | |
1520 | if (unlikely(!t)) | |
1521 | return 0; | |
1522 | ||
1523 | t->task = ct->task; | |
1524 | if (ct->task == dump_task || !info->thread) { | |
1525 | t->next = info->thread; | |
1526 | info->thread = t; | |
1527 | } else { | |
1528 | /* | |
1529 | * Make sure to keep the original task at | |
1530 | * the head of the list. | |
1531 | */ | |
1532 | t->next = info->thread->next; | |
1533 | info->thread->next = t; | |
4206d3aa | 1534 | } |
83914441 | 1535 | } |
4206d3aa RM |
1536 | |
1537 | /* | |
1538 | * Now fill in each thread's information. | |
1539 | */ | |
1540 | for (t = info->thread; t != NULL; t = t->next) | |
1541 | if (!fill_thread_core_info(t, view, signr, &info->size)) | |
1542 | return 0; | |
1543 | ||
1544 | /* | |
1545 | * Fill in the two process-wide notes. | |
1546 | */ | |
1547 | fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm); | |
1548 | info->size += notesize(&info->psinfo); | |
1549 | ||
1550 | fill_auxv_note(&info->auxv, current->mm); | |
1551 | info->size += notesize(&info->auxv); | |
1552 | ||
1553 | return 1; | |
1554 | } | |
1555 | ||
1556 | static size_t get_note_info_size(struct elf_note_info *info) | |
1557 | { | |
1558 | return info->size; | |
1559 | } | |
1560 | ||
1561 | /* | |
1562 | * Write all the notes for each thread. When writing the first thread, the | |
1563 | * process-wide notes are interleaved after the first thread-specific note. | |
1564 | */ | |
1565 | static int write_note_info(struct elf_note_info *info, | |
1566 | struct file *file, loff_t *foffset) | |
1567 | { | |
1568 | bool first = 1; | |
1569 | struct elf_thread_core_info *t = info->thread; | |
1570 | ||
1571 | do { | |
1572 | int i; | |
1573 | ||
1574 | if (!writenote(&t->notes[0], file, foffset)) | |
1575 | return 0; | |
1576 | ||
1577 | if (first && !writenote(&info->psinfo, file, foffset)) | |
1578 | return 0; | |
1579 | if (first && !writenote(&info->auxv, file, foffset)) | |
1580 | return 0; | |
1581 | ||
1582 | for (i = 1; i < info->thread_notes; ++i) | |
1583 | if (t->notes[i].data && | |
1584 | !writenote(&t->notes[i], file, foffset)) | |
1585 | return 0; | |
1586 | ||
1587 | first = 0; | |
1588 | t = t->next; | |
1589 | } while (t); | |
1590 | ||
1591 | return 1; | |
1592 | } | |
1593 | ||
1594 | static void free_note_info(struct elf_note_info *info) | |
1595 | { | |
1596 | struct elf_thread_core_info *threads = info->thread; | |
1597 | while (threads) { | |
1598 | unsigned int i; | |
1599 | struct elf_thread_core_info *t = threads; | |
1600 | threads = t->next; | |
1601 | WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus); | |
1602 | for (i = 1; i < info->thread_notes; ++i) | |
1603 | kfree(t->notes[i].data); | |
1604 | kfree(t); | |
1605 | } | |
1606 | kfree(info->psinfo.data); | |
1607 | } | |
1608 | ||
1609 | #else | |
1610 | ||
1da177e4 LT |
1611 | /* Here is the structure in which status of each thread is captured. */ |
1612 | struct elf_thread_status | |
1613 | { | |
1614 | struct list_head list; | |
1615 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1616 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1617 | struct task_struct *thread; | |
1618 | #ifdef ELF_CORE_COPY_XFPREGS | |
5b20cd80 | 1619 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
1da177e4 LT |
1620 | #endif |
1621 | struct memelfnote notes[3]; | |
1622 | int num_notes; | |
1623 | }; | |
1624 | ||
1625 | /* | |
1626 | * In order to add the specific thread information for the elf file format, | |
f4e5cc2c JJ |
1627 | * we need to keep a linked list of every threads pr_status and then create |
1628 | * a single section for them in the final core file. | |
1da177e4 LT |
1629 | */ |
1630 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1631 | { | |
1632 | int sz = 0; | |
1633 | struct task_struct *p = t->thread; | |
1634 | t->num_notes = 0; | |
1635 | ||
1636 | fill_prstatus(&t->prstatus, p, signr); | |
1637 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1638 | ||
f4e5cc2c JJ |
1639 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
1640 | &(t->prstatus)); | |
1da177e4 LT |
1641 | t->num_notes++; |
1642 | sz += notesize(&t->notes[0]); | |
1643 | ||
f4e5cc2c JJ |
1644 | if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, |
1645 | &t->fpu))) { | |
1646 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1647 | &(t->fpu)); | |
1da177e4 LT |
1648 | t->num_notes++; |
1649 | sz += notesize(&t->notes[1]); | |
1650 | } | |
1651 | ||
1652 | #ifdef ELF_CORE_COPY_XFPREGS | |
1653 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
5b20cd80 MN |
1654 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1655 | sizeof(t->xfpu), &t->xfpu); | |
1da177e4 LT |
1656 | t->num_notes++; |
1657 | sz += notesize(&t->notes[2]); | |
1658 | } | |
1659 | #endif | |
1660 | return sz; | |
1661 | } | |
1662 | ||
3aba481f RM |
1663 | struct elf_note_info { |
1664 | struct memelfnote *notes; | |
1665 | struct elf_prstatus *prstatus; /* NT_PRSTATUS */ | |
1666 | struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */ | |
1667 | struct list_head thread_list; | |
1668 | elf_fpregset_t *fpu; | |
1669 | #ifdef ELF_CORE_COPY_XFPREGS | |
1670 | elf_fpxregset_t *xfpu; | |
1671 | #endif | |
1672 | int thread_status_size; | |
1673 | int numnote; | |
1674 | }; | |
1675 | ||
0cf062d0 | 1676 | static int elf_note_info_init(struct elf_note_info *info) |
3aba481f | 1677 | { |
0cf062d0 | 1678 | memset(info, 0, sizeof(*info)); |
3aba481f RM |
1679 | INIT_LIST_HEAD(&info->thread_list); |
1680 | ||
0cf062d0 AW |
1681 | /* Allocate space for six ELF notes */ |
1682 | info->notes = kmalloc(6 * sizeof(struct memelfnote), GFP_KERNEL); | |
3aba481f RM |
1683 | if (!info->notes) |
1684 | return 0; | |
1685 | info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL); | |
1686 | if (!info->psinfo) | |
0cf062d0 | 1687 | goto notes_free; |
3aba481f RM |
1688 | info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL); |
1689 | if (!info->prstatus) | |
0cf062d0 | 1690 | goto psinfo_free; |
3aba481f RM |
1691 | info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL); |
1692 | if (!info->fpu) | |
0cf062d0 | 1693 | goto prstatus_free; |
3aba481f RM |
1694 | #ifdef ELF_CORE_COPY_XFPREGS |
1695 | info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL); | |
1696 | if (!info->xfpu) | |
0cf062d0 | 1697 | goto fpu_free; |
3aba481f | 1698 | #endif |
0cf062d0 AW |
1699 | return 1; |
1700 | #ifdef ELF_CORE_COPY_XFPREGS | |
1701 | fpu_free: | |
1702 | kfree(info->fpu); | |
1703 | #endif | |
1704 | prstatus_free: | |
1705 | kfree(info->prstatus); | |
1706 | psinfo_free: | |
1707 | kfree(info->psinfo); | |
1708 | notes_free: | |
1709 | kfree(info->notes); | |
1710 | return 0; | |
1711 | } | |
1712 | ||
1713 | static int fill_note_info(struct elfhdr *elf, int phdrs, | |
1714 | struct elf_note_info *info, | |
1715 | long signr, struct pt_regs *regs) | |
1716 | { | |
1717 | struct list_head *t; | |
1718 | ||
1719 | if (!elf_note_info_init(info)) | |
1720 | return 0; | |
3aba481f | 1721 | |
3aba481f | 1722 | if (signr) { |
83914441 | 1723 | struct core_thread *ct; |
4220b7fe | 1724 | struct elf_thread_status *ets; |
83914441 ON |
1725 | |
1726 | for (ct = current->mm->core_state->dumper.next; | |
1727 | ct; ct = ct->next) { | |
1728 | ets = kzalloc(sizeof(*ets), GFP_KERNEL); | |
1729 | if (!ets) | |
1730 | return 0; | |
1731 | ||
1732 | ets->thread = ct->task; | |
1733 | list_add(&ets->list, &info->thread_list); | |
1734 | } | |
1735 | ||
3aba481f | 1736 | list_for_each(t, &info->thread_list) { |
3aba481f RM |
1737 | int sz; |
1738 | ||
4220b7fe WC |
1739 | ets = list_entry(t, struct elf_thread_status, list); |
1740 | sz = elf_dump_thread_status(signr, ets); | |
3aba481f RM |
1741 | info->thread_status_size += sz; |
1742 | } | |
1743 | } | |
1744 | /* now collect the dump for the current */ | |
1745 | memset(info->prstatus, 0, sizeof(*info->prstatus)); | |
1746 | fill_prstatus(info->prstatus, current, signr); | |
1747 | elf_core_copy_regs(&info->prstatus->pr_reg, regs); | |
1748 | ||
1749 | /* Set up header */ | |
1750 | fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS, ELF_OSABI); | |
1751 | ||
1752 | /* | |
1753 | * Set up the notes in similar form to SVR4 core dumps made | |
1754 | * with info from their /proc. | |
1755 | */ | |
1756 | ||
1757 | fill_note(info->notes + 0, "CORE", NT_PRSTATUS, | |
1758 | sizeof(*info->prstatus), info->prstatus); | |
1759 | fill_psinfo(info->psinfo, current->group_leader, current->mm); | |
1760 | fill_note(info->notes + 1, "CORE", NT_PRPSINFO, | |
1761 | sizeof(*info->psinfo), info->psinfo); | |
1762 | ||
1763 | info->numnote = 2; | |
1764 | ||
1765 | fill_auxv_note(&info->notes[info->numnote++], current->mm); | |
1766 | ||
1767 | /* Try to dump the FPU. */ | |
1768 | info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs, | |
1769 | info->fpu); | |
1770 | if (info->prstatus->pr_fpvalid) | |
1771 | fill_note(info->notes + info->numnote++, | |
1772 | "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu); | |
1773 | #ifdef ELF_CORE_COPY_XFPREGS | |
1774 | if (elf_core_copy_task_xfpregs(current, info->xfpu)) | |
1775 | fill_note(info->notes + info->numnote++, | |
1776 | "LINUX", ELF_CORE_XFPREG_TYPE, | |
1777 | sizeof(*info->xfpu), info->xfpu); | |
1778 | #endif | |
1779 | ||
1780 | return 1; | |
3aba481f RM |
1781 | } |
1782 | ||
1783 | static size_t get_note_info_size(struct elf_note_info *info) | |
1784 | { | |
1785 | int sz = 0; | |
1786 | int i; | |
1787 | ||
1788 | for (i = 0; i < info->numnote; i++) | |
1789 | sz += notesize(info->notes + i); | |
1790 | ||
1791 | sz += info->thread_status_size; | |
1792 | ||
1793 | return sz; | |
1794 | } | |
1795 | ||
1796 | static int write_note_info(struct elf_note_info *info, | |
1797 | struct file *file, loff_t *foffset) | |
1798 | { | |
1799 | int i; | |
1800 | struct list_head *t; | |
1801 | ||
1802 | for (i = 0; i < info->numnote; i++) | |
1803 | if (!writenote(info->notes + i, file, foffset)) | |
1804 | return 0; | |
1805 | ||
1806 | /* write out the thread status notes section */ | |
1807 | list_for_each(t, &info->thread_list) { | |
1808 | struct elf_thread_status *tmp = | |
1809 | list_entry(t, struct elf_thread_status, list); | |
1810 | ||
1811 | for (i = 0; i < tmp->num_notes; i++) | |
1812 | if (!writenote(&tmp->notes[i], file, foffset)) | |
1813 | return 0; | |
1814 | } | |
1815 | ||
1816 | return 1; | |
1817 | } | |
1818 | ||
1819 | static void free_note_info(struct elf_note_info *info) | |
1820 | { | |
1821 | while (!list_empty(&info->thread_list)) { | |
1822 | struct list_head *tmp = info->thread_list.next; | |
1823 | list_del(tmp); | |
1824 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
1825 | } | |
1826 | ||
1827 | kfree(info->prstatus); | |
1828 | kfree(info->psinfo); | |
1829 | kfree(info->notes); | |
1830 | kfree(info->fpu); | |
1831 | #ifdef ELF_CORE_COPY_XFPREGS | |
1832 | kfree(info->xfpu); | |
1833 | #endif | |
1834 | } | |
1835 | ||
4206d3aa RM |
1836 | #endif |
1837 | ||
f47aef55 RM |
1838 | static struct vm_area_struct *first_vma(struct task_struct *tsk, |
1839 | struct vm_area_struct *gate_vma) | |
1840 | { | |
1841 | struct vm_area_struct *ret = tsk->mm->mmap; | |
1842 | ||
1843 | if (ret) | |
1844 | return ret; | |
1845 | return gate_vma; | |
1846 | } | |
1847 | /* | |
1848 | * Helper function for iterating across a vma list. It ensures that the caller | |
1849 | * will visit `gate_vma' prior to terminating the search. | |
1850 | */ | |
1851 | static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma, | |
1852 | struct vm_area_struct *gate_vma) | |
1853 | { | |
1854 | struct vm_area_struct *ret; | |
1855 | ||
1856 | ret = this_vma->vm_next; | |
1857 | if (ret) | |
1858 | return ret; | |
1859 | if (this_vma == gate_vma) | |
1860 | return NULL; | |
1861 | return gate_vma; | |
1862 | } | |
1863 | ||
8d9032bb DH |
1864 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
1865 | elf_addr_t e_shoff, int segs) | |
1866 | { | |
1867 | elf->e_shoff = e_shoff; | |
1868 | elf->e_shentsize = sizeof(*shdr4extnum); | |
1869 | elf->e_shnum = 1; | |
1870 | elf->e_shstrndx = SHN_UNDEF; | |
1871 | ||
1872 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); | |
1873 | ||
1874 | shdr4extnum->sh_type = SHT_NULL; | |
1875 | shdr4extnum->sh_size = elf->e_shnum; | |
1876 | shdr4extnum->sh_link = elf->e_shstrndx; | |
1877 | shdr4extnum->sh_info = segs; | |
1878 | } | |
1879 | ||
1880 | static size_t elf_core_vma_data_size(struct vm_area_struct *gate_vma, | |
1881 | unsigned long mm_flags) | |
1882 | { | |
1883 | struct vm_area_struct *vma; | |
1884 | size_t size = 0; | |
1885 | ||
1886 | for (vma = first_vma(current, gate_vma); vma != NULL; | |
1887 | vma = next_vma(vma, gate_vma)) | |
1888 | size += vma_dump_size(vma, mm_flags); | |
1889 | return size; | |
1890 | } | |
1891 | ||
1da177e4 LT |
1892 | /* |
1893 | * Actual dumper | |
1894 | * | |
1895 | * This is a two-pass process; first we find the offsets of the bits, | |
1896 | * and then they are actually written out. If we run out of core limit | |
1897 | * we just truncate. | |
1898 | */ | |
f6151dfe | 1899 | static int elf_core_dump(struct coredump_params *cprm) |
1da177e4 | 1900 | { |
1da177e4 LT |
1901 | int has_dumped = 0; |
1902 | mm_segment_t fs; | |
1903 | int segs; | |
1904 | size_t size = 0; | |
f47aef55 | 1905 | struct vm_area_struct *vma, *gate_vma; |
1da177e4 | 1906 | struct elfhdr *elf = NULL; |
d025c9db | 1907 | loff_t offset = 0, dataoff, foffset; |
3aba481f | 1908 | struct elf_note_info info; |
93eb211e | 1909 | struct elf_phdr *phdr4note = NULL; |
8d9032bb DH |
1910 | struct elf_shdr *shdr4extnum = NULL; |
1911 | Elf_Half e_phnum; | |
1912 | elf_addr_t e_shoff; | |
1da177e4 LT |
1913 | |
1914 | /* | |
1915 | * We no longer stop all VM operations. | |
1916 | * | |
f4e5cc2c JJ |
1917 | * This is because those proceses that could possibly change map_count |
1918 | * or the mmap / vma pages are now blocked in do_exit on current | |
1919 | * finishing this core dump. | |
1da177e4 LT |
1920 | * |
1921 | * Only ptrace can touch these memory addresses, but it doesn't change | |
f4e5cc2c | 1922 | * the map_count or the pages allocated. So no possibility of crashing |
1da177e4 LT |
1923 | * exists while dumping the mm->vm_next areas to the core file. |
1924 | */ | |
1925 | ||
1926 | /* alloc memory for large data structures: too large to be on stack */ | |
1927 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
1928 | if (!elf) | |
5f719558 | 1929 | goto out; |
341c87bf KH |
1930 | /* |
1931 | * The number of segs are recored into ELF header as 16bit value. | |
1932 | * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here. | |
1933 | */ | |
1da177e4 | 1934 | segs = current->mm->map_count; |
1fcccbac | 1935 | segs += elf_core_extra_phdrs(); |
1da177e4 | 1936 | |
31db58b3 | 1937 | gate_vma = get_gate_vma(current->mm); |
f47aef55 RM |
1938 | if (gate_vma != NULL) |
1939 | segs++; | |
1940 | ||
8d9032bb DH |
1941 | /* for notes section */ |
1942 | segs++; | |
1943 | ||
1944 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid | |
1945 | * this, kernel supports extended numbering. Have a look at | |
1946 | * include/linux/elf.h for further information. */ | |
1947 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; | |
1948 | ||
1da177e4 | 1949 | /* |
3aba481f RM |
1950 | * Collect all the non-memory information about the process for the |
1951 | * notes. This also sets up the file header. | |
1da177e4 | 1952 | */ |
8d9032bb | 1953 | if (!fill_note_info(elf, e_phnum, &info, cprm->signr, cprm->regs)) |
3aba481f | 1954 | goto cleanup; |
1da177e4 | 1955 | |
3aba481f RM |
1956 | has_dumped = 1; |
1957 | current->flags |= PF_DUMPCORE; | |
1da177e4 LT |
1958 | |
1959 | fs = get_fs(); | |
1960 | set_fs(KERNEL_DS); | |
1961 | ||
1da177e4 | 1962 | offset += sizeof(*elf); /* Elf header */ |
8d9032bb | 1963 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
a7a0d86f | 1964 | foffset = offset; |
1da177e4 LT |
1965 | |
1966 | /* Write notes phdr entry */ | |
1967 | { | |
3aba481f | 1968 | size_t sz = get_note_info_size(&info); |
1da177e4 | 1969 | |
e5501492 | 1970 | sz += elf_coredump_extra_notes_size(); |
bf1ab978 | 1971 | |
93eb211e DH |
1972 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
1973 | if (!phdr4note) | |
088e7af7 | 1974 | goto end_coredump; |
93eb211e DH |
1975 | |
1976 | fill_elf_note_phdr(phdr4note, sz, offset); | |
1977 | offset += sz; | |
1da177e4 LT |
1978 | } |
1979 | ||
1da177e4 LT |
1980 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
1981 | ||
30736a4d | 1982 | offset += elf_core_vma_data_size(gate_vma, cprm->mm_flags); |
8d9032bb DH |
1983 | offset += elf_core_extra_data_size(); |
1984 | e_shoff = offset; | |
1985 | ||
1986 | if (e_phnum == PN_XNUM) { | |
1987 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); | |
1988 | if (!shdr4extnum) | |
1989 | goto end_coredump; | |
1990 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs); | |
1991 | } | |
1992 | ||
1993 | offset = dataoff; | |
1994 | ||
93eb211e DH |
1995 | size += sizeof(*elf); |
1996 | if (size > cprm->limit || !dump_write(cprm->file, elf, sizeof(*elf))) | |
1997 | goto end_coredump; | |
1998 | ||
1999 | size += sizeof(*phdr4note); | |
2000 | if (size > cprm->limit | |
2001 | || !dump_write(cprm->file, phdr4note, sizeof(*phdr4note))) | |
2002 | goto end_coredump; | |
2003 | ||
1da177e4 | 2004 | /* Write program headers for segments dump */ |
f47aef55 RM |
2005 | for (vma = first_vma(current, gate_vma); vma != NULL; |
2006 | vma = next_vma(vma, gate_vma)) { | |
1da177e4 | 2007 | struct elf_phdr phdr; |
1da177e4 LT |
2008 | |
2009 | phdr.p_type = PT_LOAD; | |
2010 | phdr.p_offset = offset; | |
2011 | phdr.p_vaddr = vma->vm_start; | |
2012 | phdr.p_paddr = 0; | |
30736a4d | 2013 | phdr.p_filesz = vma_dump_size(vma, cprm->mm_flags); |
82df3973 | 2014 | phdr.p_memsz = vma->vm_end - vma->vm_start; |
1da177e4 LT |
2015 | offset += phdr.p_filesz; |
2016 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
f4e5cc2c JJ |
2017 | if (vma->vm_flags & VM_WRITE) |
2018 | phdr.p_flags |= PF_W; | |
2019 | if (vma->vm_flags & VM_EXEC) | |
2020 | phdr.p_flags |= PF_X; | |
1da177e4 LT |
2021 | phdr.p_align = ELF_EXEC_PAGESIZE; |
2022 | ||
088e7af7 DH |
2023 | size += sizeof(phdr); |
2024 | if (size > cprm->limit | |
2025 | || !dump_write(cprm->file, &phdr, sizeof(phdr))) | |
2026 | goto end_coredump; | |
1da177e4 LT |
2027 | } |
2028 | ||
1fcccbac DH |
2029 | if (!elf_core_write_extra_phdrs(cprm->file, offset, &size, cprm->limit)) |
2030 | goto end_coredump; | |
1da177e4 LT |
2031 | |
2032 | /* write out the notes section */ | |
f6151dfe | 2033 | if (!write_note_info(&info, cprm->file, &foffset)) |
3aba481f | 2034 | goto end_coredump; |
1da177e4 | 2035 | |
f6151dfe | 2036 | if (elf_coredump_extra_notes_write(cprm->file, &foffset)) |
e5501492 | 2037 | goto end_coredump; |
bf1ab978 | 2038 | |
d025c9db | 2039 | /* Align to page */ |
f6151dfe | 2040 | if (!dump_seek(cprm->file, dataoff - foffset)) |
f3e8fccd | 2041 | goto end_coredump; |
1da177e4 | 2042 | |
f47aef55 RM |
2043 | for (vma = first_vma(current, gate_vma); vma != NULL; |
2044 | vma = next_vma(vma, gate_vma)) { | |
1da177e4 | 2045 | unsigned long addr; |
82df3973 | 2046 | unsigned long end; |
1da177e4 | 2047 | |
30736a4d | 2048 | end = vma->vm_start + vma_dump_size(vma, cprm->mm_flags); |
1da177e4 | 2049 | |
82df3973 | 2050 | for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) { |
f4e5cc2c | 2051 | struct page *page; |
f3e8fccd HD |
2052 | int stop; |
2053 | ||
2054 | page = get_dump_page(addr); | |
2055 | if (page) { | |
2056 | void *kaddr = kmap(page); | |
f6151dfe MH |
2057 | stop = ((size += PAGE_SIZE) > cprm->limit) || |
2058 | !dump_write(cprm->file, kaddr, | |
2059 | PAGE_SIZE); | |
f3e8fccd | 2060 | kunmap(page); |
1da177e4 | 2061 | page_cache_release(page); |
f3e8fccd | 2062 | } else |
f6151dfe | 2063 | stop = !dump_seek(cprm->file, PAGE_SIZE); |
f3e8fccd HD |
2064 | if (stop) |
2065 | goto end_coredump; | |
1da177e4 LT |
2066 | } |
2067 | } | |
2068 | ||
1fcccbac DH |
2069 | if (!elf_core_write_extra_data(cprm->file, &size, cprm->limit)) |
2070 | goto end_coredump; | |
1da177e4 | 2071 | |
8d9032bb DH |
2072 | if (e_phnum == PN_XNUM) { |
2073 | size += sizeof(*shdr4extnum); | |
2074 | if (size > cprm->limit | |
2075 | || !dump_write(cprm->file, shdr4extnum, | |
2076 | sizeof(*shdr4extnum))) | |
2077 | goto end_coredump; | |
2078 | } | |
2079 | ||
1da177e4 LT |
2080 | end_coredump: |
2081 | set_fs(fs); | |
2082 | ||
2083 | cleanup: | |
3aba481f | 2084 | free_note_info(&info); |
8d9032bb | 2085 | kfree(shdr4extnum); |
93eb211e | 2086 | kfree(phdr4note); |
5f719558 WC |
2087 | kfree(elf); |
2088 | out: | |
1da177e4 | 2089 | return has_dumped; |
1da177e4 LT |
2090 | } |
2091 | ||
698ba7b5 | 2092 | #endif /* CONFIG_ELF_CORE */ |
1da177e4 LT |
2093 | |
2094 | static int __init init_elf_binfmt(void) | |
2095 | { | |
2096 | return register_binfmt(&elf_format); | |
2097 | } | |
2098 | ||
2099 | static void __exit exit_elf_binfmt(void) | |
2100 | { | |
2101 | /* Remove the COFF and ELF loaders. */ | |
2102 | unregister_binfmt(&elf_format); | |
2103 | } | |
2104 | ||
2105 | core_initcall(init_elf_binfmt); | |
2106 | module_exit(exit_elf_binfmt); | |
2107 | MODULE_LICENSE("GPL"); |