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> | |
15 | #include <linux/stat.h> | |
16 | #include <linux/time.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/mman.h> | |
19 | #include <linux/a.out.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/signal.h> | |
22 | #include <linux/binfmts.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/file.h> | |
25 | #include <linux/fcntl.h> | |
26 | #include <linux/ptrace.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/shm.h> | |
29 | #include <linux/personality.h> | |
30 | #include <linux/elfcore.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/highuid.h> | |
33 | #include <linux/smp.h> | |
34 | #include <linux/smp_lock.h> | |
35 | #include <linux/compiler.h> | |
36 | #include <linux/highmem.h> | |
37 | #include <linux/pagemap.h> | |
38 | #include <linux/security.h> | |
39 | #include <linux/syscalls.h> | |
40 | #include <linux/random.h> | |
f4e5cc2c | 41 | #include <linux/elf.h> |
1da177e4 LT |
42 | #include <asm/uaccess.h> |
43 | #include <asm/param.h> | |
44 | #include <asm/page.h> | |
45 | ||
f4e5cc2c JJ |
46 | static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs); |
47 | static int load_elf_library(struct file *); | |
1da177e4 LT |
48 | static unsigned long elf_map (struct file *, unsigned long, struct elf_phdr *, int, int); |
49 | extern int dump_fpu (struct pt_regs *, elf_fpregset_t *); | |
50 | ||
51 | #ifndef elf_addr_t | |
52 | #define elf_addr_t unsigned long | |
53 | #endif | |
54 | ||
55 | /* | |
56 | * If we don't support core dumping, then supply a NULL so we | |
57 | * don't even try. | |
58 | */ | |
708e9a79 | 59 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
f4e5cc2c | 60 | static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file); |
1da177e4 LT |
61 | #else |
62 | #define elf_core_dump NULL | |
63 | #endif | |
64 | ||
65 | #if ELF_EXEC_PAGESIZE > PAGE_SIZE | |
f4e5cc2c | 66 | #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE |
1da177e4 | 67 | #else |
f4e5cc2c | 68 | #define ELF_MIN_ALIGN PAGE_SIZE |
1da177e4 LT |
69 | #endif |
70 | ||
71 | #ifndef ELF_CORE_EFLAGS | |
72 | #define ELF_CORE_EFLAGS 0 | |
73 | #endif | |
74 | ||
75 | #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1)) | |
76 | #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1)) | |
77 | #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1)) | |
78 | ||
79 | static struct linux_binfmt elf_format = { | |
80 | .module = THIS_MODULE, | |
81 | .load_binary = load_elf_binary, | |
82 | .load_shlib = load_elf_library, | |
83 | .core_dump = elf_core_dump, | |
84 | .min_coredump = ELF_EXEC_PAGESIZE | |
85 | }; | |
86 | ||
ce51059b | 87 | #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE) |
1da177e4 LT |
88 | |
89 | static int set_brk(unsigned long start, unsigned long end) | |
90 | { | |
91 | start = ELF_PAGEALIGN(start); | |
92 | end = ELF_PAGEALIGN(end); | |
93 | if (end > start) { | |
94 | unsigned long addr; | |
95 | down_write(¤t->mm->mmap_sem); | |
96 | addr = do_brk(start, end - start); | |
97 | up_write(¤t->mm->mmap_sem); | |
98 | if (BAD_ADDR(addr)) | |
99 | return addr; | |
100 | } | |
101 | current->mm->start_brk = current->mm->brk = end; | |
102 | return 0; | |
103 | } | |
104 | ||
1da177e4 LT |
105 | /* We need to explicitly zero any fractional pages |
106 | after the data section (i.e. bss). This would | |
107 | contain the junk from the file that should not | |
f4e5cc2c JJ |
108 | be in memory |
109 | */ | |
1da177e4 LT |
110 | static int padzero(unsigned long elf_bss) |
111 | { | |
112 | unsigned long nbyte; | |
113 | ||
114 | nbyte = ELF_PAGEOFFSET(elf_bss); | |
115 | if (nbyte) { | |
116 | nbyte = ELF_MIN_ALIGN - nbyte; | |
117 | if (clear_user((void __user *) elf_bss, nbyte)) | |
118 | return -EFAULT; | |
119 | } | |
120 | return 0; | |
121 | } | |
122 | ||
123 | /* Let's use some macros to make this stack manipulation a litle clearer */ | |
124 | #ifdef CONFIG_STACK_GROWSUP | |
125 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items)) | |
126 | #define STACK_ROUND(sp, items) \ | |
127 | ((15 + (unsigned long) ((sp) + (items))) &~ 15UL) | |
f4e5cc2c JJ |
128 | #define STACK_ALLOC(sp, len) ({ \ |
129 | elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \ | |
130 | old_sp; }) | |
1da177e4 LT |
131 | #else |
132 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items)) | |
133 | #define STACK_ROUND(sp, items) \ | |
134 | (((unsigned long) (sp - items)) &~ 15UL) | |
135 | #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; }) | |
136 | #endif | |
137 | ||
138 | static int | |
f4e5cc2c | 139 | create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec, |
1da177e4 LT |
140 | int interp_aout, unsigned long load_addr, |
141 | unsigned long interp_load_addr) | |
142 | { | |
143 | unsigned long p = bprm->p; | |
144 | int argc = bprm->argc; | |
145 | int envc = bprm->envc; | |
146 | elf_addr_t __user *argv; | |
147 | elf_addr_t __user *envp; | |
148 | elf_addr_t __user *sp; | |
149 | elf_addr_t __user *u_platform; | |
150 | const char *k_platform = ELF_PLATFORM; | |
151 | int items; | |
152 | elf_addr_t *elf_info; | |
153 | int ei_index = 0; | |
154 | struct task_struct *tsk = current; | |
155 | ||
156 | /* | |
157 | * If this architecture has a platform capability string, copy it | |
158 | * to userspace. In some cases (Sparc), this info is impossible | |
159 | * for userspace to get any other way, in others (i386) it is | |
160 | * merely difficult. | |
161 | */ | |
1da177e4 LT |
162 | u_platform = NULL; |
163 | if (k_platform) { | |
164 | size_t len = strlen(k_platform) + 1; | |
165 | ||
166 | /* | |
167 | * In some cases (e.g. Hyper-Threading), we want to avoid L1 | |
168 | * evictions by the processes running on the same package. One | |
169 | * thing we can do is to shuffle the initial stack for them. | |
170 | */ | |
f4e5cc2c | 171 | |
1da177e4 LT |
172 | p = arch_align_stack(p); |
173 | ||
174 | u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); | |
175 | if (__copy_to_user(u_platform, k_platform, len)) | |
176 | return -EFAULT; | |
177 | } | |
178 | ||
179 | /* Create the ELF interpreter info */ | |
785d5570 | 180 | elf_info = (elf_addr_t *)current->mm->saved_auxv; |
1da177e4 | 181 | #define NEW_AUX_ENT(id, val) \ |
f4e5cc2c | 182 | do { \ |
785d5570 JJ |
183 | elf_info[ei_index++] = id; \ |
184 | elf_info[ei_index++] = val; \ | |
f4e5cc2c | 185 | } while (0) |
1da177e4 LT |
186 | |
187 | #ifdef ARCH_DLINFO | |
188 | /* | |
189 | * ARCH_DLINFO must come first so PPC can do its special alignment of | |
190 | * AUXV. | |
191 | */ | |
192 | ARCH_DLINFO; | |
193 | #endif | |
194 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); | |
195 | NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE); | |
196 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
197 | NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff); | |
f4e5cc2c | 198 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
1da177e4 LT |
199 | NEW_AUX_ENT(AT_PHNUM, exec->e_phnum); |
200 | NEW_AUX_ENT(AT_BASE, interp_load_addr); | |
201 | NEW_AUX_ENT(AT_FLAGS, 0); | |
202 | NEW_AUX_ENT(AT_ENTRY, exec->e_entry); | |
785d5570 JJ |
203 | NEW_AUX_ENT(AT_UID, tsk->uid); |
204 | NEW_AUX_ENT(AT_EUID, tsk->euid); | |
205 | NEW_AUX_ENT(AT_GID, tsk->gid); | |
206 | NEW_AUX_ENT(AT_EGID, tsk->egid); | |
207 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); | |
1da177e4 | 208 | if (k_platform) { |
f4e5cc2c | 209 | NEW_AUX_ENT(AT_PLATFORM, |
785d5570 | 210 | (elf_addr_t)(unsigned long)u_platform); |
1da177e4 LT |
211 | } |
212 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { | |
785d5570 | 213 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); |
1da177e4 LT |
214 | } |
215 | #undef NEW_AUX_ENT | |
216 | /* AT_NULL is zero; clear the rest too */ | |
217 | memset(&elf_info[ei_index], 0, | |
218 | sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]); | |
219 | ||
220 | /* And advance past the AT_NULL entry. */ | |
221 | ei_index += 2; | |
222 | ||
223 | sp = STACK_ADD(p, ei_index); | |
224 | ||
225 | items = (argc + 1) + (envc + 1); | |
226 | if (interp_aout) { | |
227 | items += 3; /* a.out interpreters require argv & envp too */ | |
228 | } else { | |
229 | items += 1; /* ELF interpreters only put argc on the stack */ | |
230 | } | |
231 | bprm->p = STACK_ROUND(sp, items); | |
232 | ||
233 | /* Point sp at the lowest address on the stack */ | |
234 | #ifdef CONFIG_STACK_GROWSUP | |
235 | sp = (elf_addr_t __user *)bprm->p - items - ei_index; | |
f4e5cc2c | 236 | bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */ |
1da177e4 LT |
237 | #else |
238 | sp = (elf_addr_t __user *)bprm->p; | |
239 | #endif | |
240 | ||
241 | /* Now, let's put argc (and argv, envp if appropriate) on the stack */ | |
242 | if (__put_user(argc, sp++)) | |
243 | return -EFAULT; | |
244 | if (interp_aout) { | |
245 | argv = sp + 2; | |
246 | envp = argv + argc + 1; | |
247 | __put_user((elf_addr_t)(unsigned long)argv, sp++); | |
248 | __put_user((elf_addr_t)(unsigned long)envp, sp++); | |
249 | } else { | |
250 | argv = sp; | |
251 | envp = argv + argc + 1; | |
252 | } | |
253 | ||
254 | /* Populate argv and envp */ | |
a84a5059 | 255 | p = current->mm->arg_end = current->mm->arg_start; |
1da177e4 LT |
256 | while (argc-- > 0) { |
257 | size_t len; | |
258 | __put_user((elf_addr_t)p, argv++); | |
259 | len = strnlen_user((void __user *)p, PAGE_SIZE*MAX_ARG_PAGES); | |
260 | if (!len || len > PAGE_SIZE*MAX_ARG_PAGES) | |
261 | return 0; | |
262 | p += len; | |
263 | } | |
264 | if (__put_user(0, argv)) | |
265 | return -EFAULT; | |
266 | current->mm->arg_end = current->mm->env_start = p; | |
267 | while (envc-- > 0) { | |
268 | size_t len; | |
269 | __put_user((elf_addr_t)p, envp++); | |
270 | len = strnlen_user((void __user *)p, PAGE_SIZE*MAX_ARG_PAGES); | |
271 | if (!len || len > PAGE_SIZE*MAX_ARG_PAGES) | |
272 | return 0; | |
273 | p += len; | |
274 | } | |
275 | if (__put_user(0, envp)) | |
276 | return -EFAULT; | |
277 | current->mm->env_end = p; | |
278 | ||
279 | /* Put the elf_info on the stack in the right place. */ | |
280 | sp = (elf_addr_t __user *)envp + 1; | |
281 | if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t))) | |
282 | return -EFAULT; | |
283 | return 0; | |
284 | } | |
285 | ||
286 | #ifndef elf_map | |
287 | ||
288 | static unsigned long elf_map(struct file *filep, unsigned long addr, | |
f4e5cc2c | 289 | struct elf_phdr *eppnt, int prot, int type) |
1da177e4 LT |
290 | { |
291 | unsigned long map_addr; | |
dda6ebde | 292 | unsigned long pageoffset = ELF_PAGEOFFSET(eppnt->p_vaddr); |
1da177e4 LT |
293 | |
294 | down_write(¤t->mm->mmap_sem); | |
dda6ebde DG |
295 | /* mmap() will return -EINVAL if given a zero size, but a |
296 | * segment with zero filesize is perfectly valid */ | |
297 | if (eppnt->p_filesz + pageoffset) | |
298 | map_addr = do_mmap(filep, ELF_PAGESTART(addr), | |
299 | eppnt->p_filesz + pageoffset, prot, type, | |
300 | eppnt->p_offset - pageoffset); | |
301 | else | |
302 | map_addr = ELF_PAGESTART(addr); | |
1da177e4 LT |
303 | up_write(¤t->mm->mmap_sem); |
304 | return(map_addr); | |
305 | } | |
306 | ||
307 | #endif /* !elf_map */ | |
308 | ||
309 | /* This is much more generalized than the library routine read function, | |
310 | so we keep this separate. Technically the library read function | |
311 | is only provided so that we can read a.out libraries that have | |
312 | an ELF header */ | |
313 | ||
f4e5cc2c JJ |
314 | static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex, |
315 | struct file *interpreter, unsigned long *interp_load_addr) | |
1da177e4 LT |
316 | { |
317 | struct elf_phdr *elf_phdata; | |
318 | struct elf_phdr *eppnt; | |
319 | unsigned long load_addr = 0; | |
320 | int load_addr_set = 0; | |
321 | unsigned long last_bss = 0, elf_bss = 0; | |
322 | unsigned long error = ~0UL; | |
323 | int retval, i, size; | |
324 | ||
325 | /* First of all, some simple consistency checks */ | |
326 | if (interp_elf_ex->e_type != ET_EXEC && | |
327 | interp_elf_ex->e_type != ET_DYN) | |
328 | goto out; | |
329 | if (!elf_check_arch(interp_elf_ex)) | |
330 | goto out; | |
331 | if (!interpreter->f_op || !interpreter->f_op->mmap) | |
332 | goto out; | |
333 | ||
334 | /* | |
335 | * If the size of this structure has changed, then punt, since | |
336 | * we will be doing the wrong thing. | |
337 | */ | |
338 | if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) | |
339 | goto out; | |
340 | if (interp_elf_ex->e_phnum < 1 || | |
341 | interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr)) | |
342 | goto out; | |
343 | ||
344 | /* Now read in all of the header information */ | |
1da177e4 LT |
345 | size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum; |
346 | if (size > ELF_MIN_ALIGN) | |
347 | goto out; | |
f4e5cc2c | 348 | elf_phdata = kmalloc(size, GFP_KERNEL); |
1da177e4 LT |
349 | if (!elf_phdata) |
350 | goto out; | |
351 | ||
f4e5cc2c JJ |
352 | retval = kernel_read(interpreter, interp_elf_ex->e_phoff, |
353 | (char *)elf_phdata,size); | |
1da177e4 LT |
354 | error = -EIO; |
355 | if (retval != size) { | |
356 | if (retval < 0) | |
357 | error = retval; | |
358 | goto out_close; | |
359 | } | |
360 | ||
361 | eppnt = elf_phdata; | |
f4e5cc2c JJ |
362 | for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) { |
363 | if (eppnt->p_type == PT_LOAD) { | |
364 | int elf_type = MAP_PRIVATE | MAP_DENYWRITE; | |
365 | int elf_prot = 0; | |
366 | unsigned long vaddr = 0; | |
367 | unsigned long k, map_addr; | |
368 | ||
369 | if (eppnt->p_flags & PF_R) | |
370 | elf_prot = PROT_READ; | |
371 | if (eppnt->p_flags & PF_W) | |
372 | elf_prot |= PROT_WRITE; | |
373 | if (eppnt->p_flags & PF_X) | |
374 | elf_prot |= PROT_EXEC; | |
375 | vaddr = eppnt->p_vaddr; | |
376 | if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) | |
377 | elf_type |= MAP_FIXED; | |
378 | ||
379 | map_addr = elf_map(interpreter, load_addr + vaddr, | |
380 | eppnt, elf_prot, elf_type); | |
381 | error = map_addr; | |
382 | if (BAD_ADDR(map_addr)) | |
383 | goto out_close; | |
384 | ||
385 | if (!load_addr_set && | |
386 | interp_elf_ex->e_type == ET_DYN) { | |
387 | load_addr = map_addr - ELF_PAGESTART(vaddr); | |
388 | load_addr_set = 1; | |
389 | } | |
390 | ||
391 | /* | |
392 | * Check to see if the section's size will overflow the | |
393 | * allowed task size. Note that p_filesz must always be | |
394 | * <= p_memsize so it's only necessary to check p_memsz. | |
395 | */ | |
396 | k = load_addr + eppnt->p_vaddr; | |
ce51059b | 397 | if (BAD_ADDR(k) || |
f4e5cc2c JJ |
398 | eppnt->p_filesz > eppnt->p_memsz || |
399 | eppnt->p_memsz > TASK_SIZE || | |
400 | TASK_SIZE - eppnt->p_memsz < k) { | |
401 | error = -ENOMEM; | |
402 | goto out_close; | |
403 | } | |
404 | ||
405 | /* | |
406 | * Find the end of the file mapping for this phdr, and | |
407 | * keep track of the largest address we see for this. | |
408 | */ | |
409 | k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; | |
410 | if (k > elf_bss) | |
411 | elf_bss = k; | |
412 | ||
413 | /* | |
414 | * Do the same thing for the memory mapping - between | |
415 | * elf_bss and last_bss is the bss section. | |
416 | */ | |
417 | k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; | |
418 | if (k > last_bss) | |
419 | last_bss = k; | |
420 | } | |
1da177e4 LT |
421 | } |
422 | ||
423 | /* | |
424 | * Now fill out the bss section. First pad the last page up | |
425 | * to the page boundary, and then perform a mmap to make sure | |
426 | * that there are zero-mapped pages up to and including the | |
427 | * last bss page. | |
428 | */ | |
429 | if (padzero(elf_bss)) { | |
430 | error = -EFAULT; | |
431 | goto out_close; | |
432 | } | |
433 | ||
f4e5cc2c JJ |
434 | /* What we have mapped so far */ |
435 | elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1); | |
1da177e4 LT |
436 | |
437 | /* Map the last of the bss segment */ | |
438 | if (last_bss > elf_bss) { | |
439 | down_write(¤t->mm->mmap_sem); | |
440 | error = do_brk(elf_bss, last_bss - elf_bss); | |
441 | up_write(¤t->mm->mmap_sem); | |
442 | if (BAD_ADDR(error)) | |
443 | goto out_close; | |
444 | } | |
445 | ||
446 | *interp_load_addr = load_addr; | |
f4e5cc2c | 447 | error = ((unsigned long)interp_elf_ex->e_entry) + load_addr; |
1da177e4 LT |
448 | |
449 | out_close: | |
450 | kfree(elf_phdata); | |
451 | out: | |
452 | return error; | |
453 | } | |
454 | ||
f4e5cc2c JJ |
455 | static unsigned long load_aout_interp(struct exec *interp_ex, |
456 | struct file *interpreter) | |
1da177e4 LT |
457 | { |
458 | unsigned long text_data, elf_entry = ~0UL; | |
459 | char __user * addr; | |
460 | loff_t offset; | |
461 | ||
462 | current->mm->end_code = interp_ex->a_text; | |
463 | text_data = interp_ex->a_text + interp_ex->a_data; | |
464 | current->mm->end_data = text_data; | |
465 | current->mm->brk = interp_ex->a_bss + text_data; | |
466 | ||
467 | switch (N_MAGIC(*interp_ex)) { | |
468 | case OMAGIC: | |
469 | offset = 32; | |
470 | addr = (char __user *)0; | |
471 | break; | |
472 | case ZMAGIC: | |
473 | case QMAGIC: | |
474 | offset = N_TXTOFF(*interp_ex); | |
f4e5cc2c | 475 | addr = (char __user *)N_TXTADDR(*interp_ex); |
1da177e4 LT |
476 | break; |
477 | default: | |
478 | goto out; | |
479 | } | |
480 | ||
481 | down_write(¤t->mm->mmap_sem); | |
482 | do_brk(0, text_data); | |
483 | up_write(¤t->mm->mmap_sem); | |
484 | if (!interpreter->f_op || !interpreter->f_op->read) | |
485 | goto out; | |
486 | if (interpreter->f_op->read(interpreter, addr, text_data, &offset) < 0) | |
487 | goto out; | |
488 | flush_icache_range((unsigned long)addr, | |
489 | (unsigned long)addr + text_data); | |
490 | ||
1da177e4 LT |
491 | down_write(¤t->mm->mmap_sem); |
492 | do_brk(ELF_PAGESTART(text_data + ELF_MIN_ALIGN - 1), | |
493 | interp_ex->a_bss); | |
494 | up_write(¤t->mm->mmap_sem); | |
495 | elf_entry = interp_ex->a_entry; | |
496 | ||
497 | out: | |
498 | return elf_entry; | |
499 | } | |
500 | ||
501 | /* | |
502 | * These are the functions used to load ELF style executables and shared | |
503 | * libraries. There is no binary dependent code anywhere else. | |
504 | */ | |
505 | ||
506 | #define INTERPRETER_NONE 0 | |
507 | #define INTERPRETER_AOUT 1 | |
508 | #define INTERPRETER_ELF 2 | |
509 | ||
913bd906 AK |
510 | #ifndef STACK_RND_MASK |
511 | #define STACK_RND_MASK 0x7ff /* with 4K pages 8MB of VA */ | |
512 | #endif | |
1da177e4 LT |
513 | |
514 | static unsigned long randomize_stack_top(unsigned long stack_top) | |
515 | { | |
516 | unsigned int random_variable = 0; | |
517 | ||
c16b63e0 AK |
518 | if ((current->flags & PF_RANDOMIZE) && |
519 | !(current->personality & ADDR_NO_RANDOMIZE)) { | |
913bd906 AK |
520 | random_variable = get_random_int() & STACK_RND_MASK; |
521 | random_variable <<= PAGE_SHIFT; | |
522 | } | |
1da177e4 | 523 | #ifdef CONFIG_STACK_GROWSUP |
913bd906 | 524 | return PAGE_ALIGN(stack_top) + random_variable; |
1da177e4 | 525 | #else |
913bd906 | 526 | return PAGE_ALIGN(stack_top) - random_variable; |
1da177e4 LT |
527 | #endif |
528 | } | |
529 | ||
f4e5cc2c | 530 | static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs) |
1da177e4 LT |
531 | { |
532 | struct file *interpreter = NULL; /* to shut gcc up */ | |
533 | unsigned long load_addr = 0, load_bias = 0; | |
534 | int load_addr_set = 0; | |
535 | char * elf_interpreter = NULL; | |
536 | unsigned int interpreter_type = INTERPRETER_NONE; | |
537 | unsigned char ibcs2_interpreter = 0; | |
538 | unsigned long error; | |
f4e5cc2c | 539 | struct elf_phdr *elf_ppnt, *elf_phdata; |
1da177e4 LT |
540 | unsigned long elf_bss, elf_brk; |
541 | int elf_exec_fileno; | |
542 | int retval, i; | |
543 | unsigned int size; | |
544 | unsigned long elf_entry, interp_load_addr = 0; | |
545 | unsigned long start_code, end_code, start_data, end_data; | |
546 | unsigned long reloc_func_desc = 0; | |
547 | char passed_fileno[6]; | |
548 | struct files_struct *files; | |
549 | int have_pt_gnu_stack, executable_stack = EXSTACK_DEFAULT; | |
550 | unsigned long def_flags = 0; | |
551 | struct { | |
552 | struct elfhdr elf_ex; | |
553 | struct elfhdr interp_elf_ex; | |
554 | struct exec interp_ex; | |
555 | } *loc; | |
556 | ||
557 | loc = kmalloc(sizeof(*loc), GFP_KERNEL); | |
558 | if (!loc) { | |
559 | retval = -ENOMEM; | |
560 | goto out_ret; | |
561 | } | |
562 | ||
563 | /* Get the exec-header */ | |
f4e5cc2c | 564 | loc->elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4 LT |
565 | |
566 | retval = -ENOEXEC; | |
567 | /* First of all, some simple consistency checks */ | |
568 | if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
569 | goto out; | |
570 | ||
571 | if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN) | |
572 | goto out; | |
573 | if (!elf_check_arch(&loc->elf_ex)) | |
574 | goto out; | |
575 | if (!bprm->file->f_op||!bprm->file->f_op->mmap) | |
576 | goto out; | |
577 | ||
578 | /* Now read in all of the header information */ | |
1da177e4 LT |
579 | if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr)) |
580 | goto out; | |
581 | if (loc->elf_ex.e_phnum < 1 || | |
582 | loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr)) | |
583 | goto out; | |
584 | size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr); | |
585 | retval = -ENOMEM; | |
f4e5cc2c | 586 | elf_phdata = kmalloc(size, GFP_KERNEL); |
1da177e4 LT |
587 | if (!elf_phdata) |
588 | goto out; | |
589 | ||
f4e5cc2c JJ |
590 | retval = kernel_read(bprm->file, loc->elf_ex.e_phoff, |
591 | (char *)elf_phdata, size); | |
1da177e4 LT |
592 | if (retval != size) { |
593 | if (retval >= 0) | |
594 | retval = -EIO; | |
595 | goto out_free_ph; | |
596 | } | |
597 | ||
f4e5cc2c | 598 | files = current->files; /* Refcounted so ok */ |
1da177e4 LT |
599 | retval = unshare_files(); |
600 | if (retval < 0) | |
601 | goto out_free_ph; | |
602 | if (files == current->files) { | |
603 | put_files_struct(files); | |
604 | files = NULL; | |
605 | } | |
606 | ||
607 | /* exec will make our files private anyway, but for the a.out | |
608 | loader stuff we need to do it earlier */ | |
1da177e4 LT |
609 | retval = get_unused_fd(); |
610 | if (retval < 0) | |
611 | goto out_free_fh; | |
612 | get_file(bprm->file); | |
613 | fd_install(elf_exec_fileno = retval, bprm->file); | |
614 | ||
615 | elf_ppnt = elf_phdata; | |
616 | elf_bss = 0; | |
617 | elf_brk = 0; | |
618 | ||
619 | start_code = ~0UL; | |
620 | end_code = 0; | |
621 | start_data = 0; | |
622 | end_data = 0; | |
623 | ||
624 | for (i = 0; i < loc->elf_ex.e_phnum; i++) { | |
625 | if (elf_ppnt->p_type == PT_INTERP) { | |
626 | /* This is the program interpreter used for | |
627 | * shared libraries - for now assume that this | |
628 | * is an a.out format binary | |
629 | */ | |
1da177e4 LT |
630 | retval = -ENOEXEC; |
631 | if (elf_ppnt->p_filesz > PATH_MAX || | |
632 | elf_ppnt->p_filesz < 2) | |
633 | goto out_free_file; | |
634 | ||
635 | retval = -ENOMEM; | |
792db3af | 636 | elf_interpreter = kmalloc(elf_ppnt->p_filesz, |
f4e5cc2c | 637 | GFP_KERNEL); |
1da177e4 LT |
638 | if (!elf_interpreter) |
639 | goto out_free_file; | |
640 | ||
641 | retval = kernel_read(bprm->file, elf_ppnt->p_offset, | |
f4e5cc2c JJ |
642 | elf_interpreter, |
643 | elf_ppnt->p_filesz); | |
1da177e4 LT |
644 | if (retval != elf_ppnt->p_filesz) { |
645 | if (retval >= 0) | |
646 | retval = -EIO; | |
647 | goto out_free_interp; | |
648 | } | |
649 | /* make sure path is NULL terminated */ | |
650 | retval = -ENOEXEC; | |
651 | if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0') | |
652 | goto out_free_interp; | |
653 | ||
654 | /* If the program interpreter is one of these two, | |
655 | * then assume an iBCS2 image. Otherwise assume | |
656 | * a native linux image. | |
657 | */ | |
658 | if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 || | |
659 | strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) | |
660 | ibcs2_interpreter = 1; | |
661 | ||
662 | /* | |
663 | * The early SET_PERSONALITY here is so that the lookup | |
664 | * for the interpreter happens in the namespace of the | |
665 | * to-be-execed image. SET_PERSONALITY can select an | |
666 | * alternate root. | |
667 | * | |
668 | * However, SET_PERSONALITY is NOT allowed to switch | |
669 | * this task into the new images's memory mapping | |
670 | * policy - that is, TASK_SIZE must still evaluate to | |
671 | * that which is appropriate to the execing application. | |
672 | * This is because exit_mmap() needs to have TASK_SIZE | |
673 | * evaluate to the size of the old image. | |
674 | * | |
675 | * So if (say) a 64-bit application is execing a 32-bit | |
676 | * application it is the architecture's responsibility | |
677 | * to defer changing the value of TASK_SIZE until the | |
678 | * switch really is going to happen - do this in | |
679 | * flush_thread(). - akpm | |
680 | */ | |
681 | SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter); | |
682 | ||
683 | interpreter = open_exec(elf_interpreter); | |
684 | retval = PTR_ERR(interpreter); | |
685 | if (IS_ERR(interpreter)) | |
686 | goto out_free_interp; | |
f4e5cc2c JJ |
687 | retval = kernel_read(interpreter, 0, bprm->buf, |
688 | BINPRM_BUF_SIZE); | |
1da177e4 LT |
689 | if (retval != BINPRM_BUF_SIZE) { |
690 | if (retval >= 0) | |
691 | retval = -EIO; | |
692 | goto out_free_dentry; | |
693 | } | |
694 | ||
695 | /* Get the exec headers */ | |
f4e5cc2c JJ |
696 | loc->interp_ex = *((struct exec *)bprm->buf); |
697 | loc->interp_elf_ex = *((struct elfhdr *)bprm->buf); | |
1da177e4 LT |
698 | break; |
699 | } | |
700 | elf_ppnt++; | |
701 | } | |
702 | ||
703 | elf_ppnt = elf_phdata; | |
704 | for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) | |
705 | if (elf_ppnt->p_type == PT_GNU_STACK) { | |
706 | if (elf_ppnt->p_flags & PF_X) | |
707 | executable_stack = EXSTACK_ENABLE_X; | |
708 | else | |
709 | executable_stack = EXSTACK_DISABLE_X; | |
710 | break; | |
711 | } | |
712 | have_pt_gnu_stack = (i < loc->elf_ex.e_phnum); | |
713 | ||
714 | /* Some simple consistency checks for the interpreter */ | |
715 | if (elf_interpreter) { | |
716 | interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT; | |
717 | ||
718 | /* Now figure out which format our binary is */ | |
719 | if ((N_MAGIC(loc->interp_ex) != OMAGIC) && | |
720 | (N_MAGIC(loc->interp_ex) != ZMAGIC) && | |
721 | (N_MAGIC(loc->interp_ex) != QMAGIC)) | |
722 | interpreter_type = INTERPRETER_ELF; | |
723 | ||
724 | if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
725 | interpreter_type &= ~INTERPRETER_ELF; | |
726 | ||
727 | retval = -ELIBBAD; | |
728 | if (!interpreter_type) | |
729 | goto out_free_dentry; | |
730 | ||
731 | /* Make sure only one type was selected */ | |
732 | if ((interpreter_type & INTERPRETER_ELF) && | |
733 | interpreter_type != INTERPRETER_ELF) { | |
734 | // FIXME - ratelimit this before re-enabling | |
735 | // printk(KERN_WARNING "ELF: Ambiguous type, using ELF\n"); | |
736 | interpreter_type = INTERPRETER_ELF; | |
737 | } | |
738 | /* Verify the interpreter has a valid arch */ | |
739 | if ((interpreter_type == INTERPRETER_ELF) && | |
740 | !elf_check_arch(&loc->interp_elf_ex)) | |
741 | goto out_free_dentry; | |
742 | } else { | |
743 | /* Executables without an interpreter also need a personality */ | |
744 | SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter); | |
745 | } | |
746 | ||
747 | /* OK, we are done with that, now set up the arg stuff, | |
748 | and then start this sucker up */ | |
1da177e4 LT |
749 | if ((!bprm->sh_bang) && (interpreter_type == INTERPRETER_AOUT)) { |
750 | char *passed_p = passed_fileno; | |
751 | sprintf(passed_fileno, "%d", elf_exec_fileno); | |
752 | ||
753 | if (elf_interpreter) { | |
754 | retval = copy_strings_kernel(1, &passed_p, bprm); | |
755 | if (retval) | |
756 | goto out_free_dentry; | |
757 | bprm->argc++; | |
758 | } | |
759 | } | |
760 | ||
761 | /* Flush all traces of the currently running executable */ | |
762 | retval = flush_old_exec(bprm); | |
763 | if (retval) | |
764 | goto out_free_dentry; | |
765 | ||
766 | /* Discard our unneeded old files struct */ | |
767 | if (files) { | |
1da177e4 LT |
768 | put_files_struct(files); |
769 | files = NULL; | |
770 | } | |
771 | ||
772 | /* OK, This is the point of no return */ | |
773 | current->mm->start_data = 0; | |
774 | current->mm->end_data = 0; | |
775 | current->mm->end_code = 0; | |
776 | current->mm->mmap = NULL; | |
777 | current->flags &= ~PF_FORKNOEXEC; | |
778 | current->mm->def_flags = def_flags; | |
779 | ||
780 | /* Do this immediately, since STACK_TOP as used in setup_arg_pages | |
781 | may depend on the personality. */ | |
782 | SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter); | |
783 | if (elf_read_implies_exec(loc->elf_ex, executable_stack)) | |
784 | current->personality |= READ_IMPLIES_EXEC; | |
785 | ||
f4e5cc2c | 786 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
1da177e4 LT |
787 | current->flags |= PF_RANDOMIZE; |
788 | arch_pick_mmap_layout(current->mm); | |
789 | ||
790 | /* Do this so that we can load the interpreter, if need be. We will | |
791 | change some of these later */ | |
1da177e4 | 792 | current->mm->free_area_cache = current->mm->mmap_base; |
1363c3cd | 793 | current->mm->cached_hole_size = 0; |
1da177e4 LT |
794 | retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP), |
795 | executable_stack); | |
796 | if (retval < 0) { | |
797 | send_sig(SIGKILL, current, 0); | |
798 | goto out_free_dentry; | |
799 | } | |
800 | ||
1da177e4 LT |
801 | current->mm->start_stack = bprm->p; |
802 | ||
803 | /* Now we do a little grungy work by mmaping the ELF image into | |
804 | the correct location in memory. At this point, we assume that | |
805 | the image should be loaded at fixed address, not at a variable | |
806 | address. */ | |
f4e5cc2c JJ |
807 | for(i = 0, elf_ppnt = elf_phdata; |
808 | i < loc->elf_ex.e_phnum; i++, elf_ppnt++) { | |
1da177e4 LT |
809 | int elf_prot = 0, elf_flags; |
810 | unsigned long k, vaddr; | |
811 | ||
812 | if (elf_ppnt->p_type != PT_LOAD) | |
813 | continue; | |
814 | ||
815 | if (unlikely (elf_brk > elf_bss)) { | |
816 | unsigned long nbyte; | |
817 | ||
818 | /* There was a PT_LOAD segment with p_memsz > p_filesz | |
819 | before this one. Map anonymous pages, if needed, | |
820 | and clear the area. */ | |
821 | retval = set_brk (elf_bss + load_bias, | |
822 | elf_brk + load_bias); | |
823 | if (retval) { | |
824 | send_sig(SIGKILL, current, 0); | |
825 | goto out_free_dentry; | |
826 | } | |
827 | nbyte = ELF_PAGEOFFSET(elf_bss); | |
828 | if (nbyte) { | |
829 | nbyte = ELF_MIN_ALIGN - nbyte; | |
830 | if (nbyte > elf_brk - elf_bss) | |
831 | nbyte = elf_brk - elf_bss; | |
832 | if (clear_user((void __user *)elf_bss + | |
833 | load_bias, nbyte)) { | |
834 | /* | |
835 | * This bss-zeroing can fail if the ELF | |
f4e5cc2c | 836 | * file specifies odd protections. So |
1da177e4 LT |
837 | * we don't check the return value |
838 | */ | |
839 | } | |
840 | } | |
841 | } | |
842 | ||
f4e5cc2c JJ |
843 | if (elf_ppnt->p_flags & PF_R) |
844 | elf_prot |= PROT_READ; | |
845 | if (elf_ppnt->p_flags & PF_W) | |
846 | elf_prot |= PROT_WRITE; | |
847 | if (elf_ppnt->p_flags & PF_X) | |
848 | elf_prot |= PROT_EXEC; | |
1da177e4 | 849 | |
f4e5cc2c | 850 | elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE; |
1da177e4 LT |
851 | |
852 | vaddr = elf_ppnt->p_vaddr; | |
853 | if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) { | |
854 | elf_flags |= MAP_FIXED; | |
855 | } else if (loc->elf_ex.e_type == ET_DYN) { | |
f4e5cc2c JJ |
856 | /* Try and get dynamic programs out of the way of the |
857 | * default mmap base, as well as whatever program they | |
858 | * might try to exec. This is because the brk will | |
859 | * follow the loader, and is not movable. */ | |
1da177e4 LT |
860 | load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); |
861 | } | |
862 | ||
f4e5cc2c JJ |
863 | error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, |
864 | elf_prot, elf_flags); | |
1da177e4 LT |
865 | if (BAD_ADDR(error)) { |
866 | send_sig(SIGKILL, current, 0); | |
867 | goto out_free_dentry; | |
868 | } | |
869 | ||
870 | if (!load_addr_set) { | |
871 | load_addr_set = 1; | |
872 | load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset); | |
873 | if (loc->elf_ex.e_type == ET_DYN) { | |
874 | load_bias += error - | |
875 | ELF_PAGESTART(load_bias + vaddr); | |
876 | load_addr += load_bias; | |
877 | reloc_func_desc = load_bias; | |
878 | } | |
879 | } | |
880 | k = elf_ppnt->p_vaddr; | |
f4e5cc2c JJ |
881 | if (k < start_code) |
882 | start_code = k; | |
883 | if (start_data < k) | |
884 | start_data = k; | |
1da177e4 LT |
885 | |
886 | /* | |
887 | * Check to see if the section's size will overflow the | |
888 | * allowed task size. Note that p_filesz must always be | |
889 | * <= p_memsz so it is only necessary to check p_memsz. | |
890 | */ | |
ce51059b | 891 | if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz || |
1da177e4 LT |
892 | elf_ppnt->p_memsz > TASK_SIZE || |
893 | TASK_SIZE - elf_ppnt->p_memsz < k) { | |
f4e5cc2c | 894 | /* set_brk can never work. Avoid overflows. */ |
1da177e4 LT |
895 | send_sig(SIGKILL, current, 0); |
896 | goto out_free_dentry; | |
897 | } | |
898 | ||
899 | k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; | |
900 | ||
901 | if (k > elf_bss) | |
902 | elf_bss = k; | |
903 | if ((elf_ppnt->p_flags & PF_X) && end_code < k) | |
904 | end_code = k; | |
905 | if (end_data < k) | |
906 | end_data = k; | |
907 | k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; | |
908 | if (k > elf_brk) | |
909 | elf_brk = k; | |
910 | } | |
911 | ||
912 | loc->elf_ex.e_entry += load_bias; | |
913 | elf_bss += load_bias; | |
914 | elf_brk += load_bias; | |
915 | start_code += load_bias; | |
916 | end_code += load_bias; | |
917 | start_data += load_bias; | |
918 | end_data += load_bias; | |
919 | ||
920 | /* Calling set_brk effectively mmaps the pages that we need | |
921 | * for the bss and break sections. We must do this before | |
922 | * mapping in the interpreter, to make sure it doesn't wind | |
923 | * up getting placed where the bss needs to go. | |
924 | */ | |
925 | retval = set_brk(elf_bss, elf_brk); | |
926 | if (retval) { | |
927 | send_sig(SIGKILL, current, 0); | |
928 | goto out_free_dentry; | |
929 | } | |
6de50517 | 930 | if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) { |
1da177e4 LT |
931 | send_sig(SIGSEGV, current, 0); |
932 | retval = -EFAULT; /* Nobody gets to see this, but.. */ | |
933 | goto out_free_dentry; | |
934 | } | |
935 | ||
936 | if (elf_interpreter) { | |
937 | if (interpreter_type == INTERPRETER_AOUT) | |
938 | elf_entry = load_aout_interp(&loc->interp_ex, | |
939 | interpreter); | |
940 | else | |
941 | elf_entry = load_elf_interp(&loc->interp_elf_ex, | |
942 | interpreter, | |
943 | &interp_load_addr); | |
944 | if (BAD_ADDR(elf_entry)) { | |
1da177e4 | 945 | force_sig(SIGSEGV, current); |
ce51059b CE |
946 | retval = IS_ERR((void *)elf_entry) ? |
947 | (int)elf_entry : -EINVAL; | |
1da177e4 LT |
948 | goto out_free_dentry; |
949 | } | |
950 | reloc_func_desc = interp_load_addr; | |
951 | ||
952 | allow_write_access(interpreter); | |
953 | fput(interpreter); | |
954 | kfree(elf_interpreter); | |
955 | } else { | |
956 | elf_entry = loc->elf_ex.e_entry; | |
5342fba5 | 957 | if (BAD_ADDR(elf_entry)) { |
ce51059b CE |
958 | force_sig(SIGSEGV, current); |
959 | retval = -EINVAL; | |
5342fba5 SS |
960 | goto out_free_dentry; |
961 | } | |
1da177e4 LT |
962 | } |
963 | ||
964 | kfree(elf_phdata); | |
965 | ||
966 | if (interpreter_type != INTERPRETER_AOUT) | |
967 | sys_close(elf_exec_fileno); | |
968 | ||
969 | set_binfmt(&elf_format); | |
970 | ||
547ee84c BH |
971 | #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
972 | retval = arch_setup_additional_pages(bprm, executable_stack); | |
973 | if (retval < 0) { | |
974 | send_sig(SIGKILL, current, 0); | |
18c8baff | 975 | goto out; |
547ee84c BH |
976 | } |
977 | #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */ | |
978 | ||
1da177e4 LT |
979 | compute_creds(bprm); |
980 | current->flags &= ~PF_FORKNOEXEC; | |
f4e5cc2c JJ |
981 | create_elf_tables(bprm, &loc->elf_ex, |
982 | (interpreter_type == INTERPRETER_AOUT), | |
983 | load_addr, interp_load_addr); | |
1da177e4 LT |
984 | /* N.B. passed_fileno might not be initialized? */ |
985 | if (interpreter_type == INTERPRETER_AOUT) | |
986 | current->mm->arg_start += strlen(passed_fileno) + 1; | |
987 | current->mm->end_code = end_code; | |
988 | current->mm->start_code = start_code; | |
989 | current->mm->start_data = start_data; | |
990 | current->mm->end_data = end_data; | |
991 | current->mm->start_stack = bprm->p; | |
992 | ||
993 | if (current->personality & MMAP_PAGE_ZERO) { | |
994 | /* Why this, you ask??? Well SVr4 maps page 0 as read-only, | |
995 | and some applications "depend" upon this behavior. | |
996 | Since we do not have the power to recompile these, we | |
f4e5cc2c | 997 | emulate the SVr4 behavior. Sigh. */ |
1da177e4 LT |
998 | down_write(¤t->mm->mmap_sem); |
999 | error = do_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC, | |
1000 | MAP_FIXED | MAP_PRIVATE, 0); | |
1001 | up_write(¤t->mm->mmap_sem); | |
1002 | } | |
1003 | ||
1004 | #ifdef ELF_PLAT_INIT | |
1005 | /* | |
1006 | * The ABI may specify that certain registers be set up in special | |
1007 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
1008 | * example. In addition, it may also specify (eg, PowerPC64 ELF) | |
1009 | * that the e_entry field is the address of the function descriptor | |
1010 | * for the startup routine, rather than the address of the startup | |
1011 | * routine itself. This macro performs whatever initialization to | |
1012 | * the regs structure is required as well as any relocations to the | |
1013 | * function descriptor entries when executing dynamically links apps. | |
1014 | */ | |
1015 | ELF_PLAT_INIT(regs, reloc_func_desc); | |
1016 | #endif | |
1017 | ||
1018 | start_thread(regs, elf_entry, bprm->p); | |
1019 | if (unlikely(current->ptrace & PT_PTRACED)) { | |
1020 | if (current->ptrace & PT_TRACE_EXEC) | |
1021 | ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP); | |
1022 | else | |
1023 | send_sig(SIGTRAP, current, 0); | |
1024 | } | |
1025 | retval = 0; | |
1026 | out: | |
1027 | kfree(loc); | |
1028 | out_ret: | |
1029 | return retval; | |
1030 | ||
1031 | /* error cleanup */ | |
1032 | out_free_dentry: | |
1033 | allow_write_access(interpreter); | |
1034 | if (interpreter) | |
1035 | fput(interpreter); | |
1036 | out_free_interp: | |
f99d49ad | 1037 | kfree(elf_interpreter); |
1da177e4 LT |
1038 | out_free_file: |
1039 | sys_close(elf_exec_fileno); | |
1040 | out_free_fh: | |
1041 | if (files) { | |
1042 | put_files_struct(current->files); | |
1043 | current->files = files; | |
1044 | } | |
1045 | out_free_ph: | |
1046 | kfree(elf_phdata); | |
1047 | goto out; | |
1048 | } | |
1049 | ||
1050 | /* This is really simpleminded and specialized - we are loading an | |
1051 | a.out library that is given an ELF header. */ | |
1da177e4 LT |
1052 | static int load_elf_library(struct file *file) |
1053 | { | |
1054 | struct elf_phdr *elf_phdata; | |
1055 | struct elf_phdr *eppnt; | |
1056 | unsigned long elf_bss, bss, len; | |
1057 | int retval, error, i, j; | |
1058 | struct elfhdr elf_ex; | |
1059 | ||
1060 | error = -ENOEXEC; | |
f4e5cc2c | 1061 | retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex)); |
1da177e4 LT |
1062 | if (retval != sizeof(elf_ex)) |
1063 | goto out; | |
1064 | ||
1065 | if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1066 | goto out; | |
1067 | ||
1068 | /* First of all, some simple consistency checks */ | |
1069 | if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 || | |
f4e5cc2c | 1070 | !elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap) |
1da177e4 LT |
1071 | goto out; |
1072 | ||
1073 | /* Now read in all of the header information */ | |
1074 | ||
1075 | j = sizeof(struct elf_phdr) * elf_ex.e_phnum; | |
1076 | /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */ | |
1077 | ||
1078 | error = -ENOMEM; | |
1079 | elf_phdata = kmalloc(j, GFP_KERNEL); | |
1080 | if (!elf_phdata) | |
1081 | goto out; | |
1082 | ||
1083 | eppnt = elf_phdata; | |
1084 | error = -ENOEXEC; | |
1085 | retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j); | |
1086 | if (retval != j) | |
1087 | goto out_free_ph; | |
1088 | ||
1089 | for (j = 0, i = 0; i<elf_ex.e_phnum; i++) | |
1090 | if ((eppnt + i)->p_type == PT_LOAD) | |
1091 | j++; | |
1092 | if (j != 1) | |
1093 | goto out_free_ph; | |
1094 | ||
1095 | while (eppnt->p_type != PT_LOAD) | |
1096 | eppnt++; | |
1097 | ||
1098 | /* Now use mmap to map the library into memory. */ | |
1099 | down_write(¤t->mm->mmap_sem); | |
1100 | error = do_mmap(file, | |
1101 | ELF_PAGESTART(eppnt->p_vaddr), | |
1102 | (eppnt->p_filesz + | |
1103 | ELF_PAGEOFFSET(eppnt->p_vaddr)), | |
1104 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
1105 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, | |
1106 | (eppnt->p_offset - | |
1107 | ELF_PAGEOFFSET(eppnt->p_vaddr))); | |
1108 | up_write(¤t->mm->mmap_sem); | |
1109 | if (error != ELF_PAGESTART(eppnt->p_vaddr)) | |
1110 | goto out_free_ph; | |
1111 | ||
1112 | elf_bss = eppnt->p_vaddr + eppnt->p_filesz; | |
1113 | if (padzero(elf_bss)) { | |
1114 | error = -EFAULT; | |
1115 | goto out_free_ph; | |
1116 | } | |
1117 | ||
f4e5cc2c JJ |
1118 | len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + |
1119 | ELF_MIN_ALIGN - 1); | |
1da177e4 LT |
1120 | bss = eppnt->p_memsz + eppnt->p_vaddr; |
1121 | if (bss > len) { | |
1122 | down_write(¤t->mm->mmap_sem); | |
1123 | do_brk(len, bss - len); | |
1124 | up_write(¤t->mm->mmap_sem); | |
1125 | } | |
1126 | error = 0; | |
1127 | ||
1128 | out_free_ph: | |
1129 | kfree(elf_phdata); | |
1130 | out: | |
1131 | return error; | |
1132 | } | |
1133 | ||
1134 | /* | |
1135 | * Note that some platforms still use traditional core dumps and not | |
1136 | * the ELF core dump. Each platform can select it as appropriate. | |
1137 | */ | |
708e9a79 | 1138 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
1da177e4 LT |
1139 | |
1140 | /* | |
1141 | * ELF core dumper | |
1142 | * | |
1143 | * Modelled on fs/exec.c:aout_core_dump() | |
1144 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1145 | */ | |
1146 | /* | |
1147 | * These are the only things you should do on a core-file: use only these | |
1148 | * functions to write out all the necessary info. | |
1149 | */ | |
1150 | static int dump_write(struct file *file, const void *addr, int nr) | |
1151 | { | |
1152 | return file->f_op->write(file, addr, nr, &file->f_pos) == nr; | |
1153 | } | |
1154 | ||
5db92850 | 1155 | static int dump_seek(struct file *file, loff_t off) |
1da177e4 LT |
1156 | { |
1157 | if (file->f_op->llseek) { | |
1158 | if (file->f_op->llseek(file, off, 0) != off) | |
1159 | return 0; | |
1160 | } else | |
1161 | file->f_pos = off; | |
1162 | return 1; | |
1163 | } | |
1164 | ||
1165 | /* | |
1166 | * Decide whether a segment is worth dumping; default is yes to be | |
1167 | * sure (missing info is worse than too much; etc). | |
1168 | * Personally I'd include everything, and use the coredump limit... | |
1169 | * | |
1170 | * I think we should skip something. But I am not sure how. H.J. | |
1171 | */ | |
1172 | static int maydump(struct vm_area_struct *vma) | |
1173 | { | |
1174 | /* Do not dump I/O mapped devices or special mappings */ | |
1175 | if (vma->vm_flags & (VM_IO | VM_RESERVED)) | |
1176 | return 0; | |
1177 | ||
f4e5cc2c | 1178 | /* Dump shared memory only if mapped from an anonymous file. */ |
1da177e4 LT |
1179 | if (vma->vm_flags & VM_SHARED) |
1180 | return vma->vm_file->f_dentry->d_inode->i_nlink == 0; | |
1181 | ||
1182 | /* If it hasn't been written to, don't write it out */ | |
1183 | if (!vma->anon_vma) | |
1184 | return 0; | |
1185 | ||
1186 | return 1; | |
1187 | } | |
1188 | ||
1da177e4 LT |
1189 | /* An ELF note in memory */ |
1190 | struct memelfnote | |
1191 | { | |
1192 | const char *name; | |
1193 | int type; | |
1194 | unsigned int datasz; | |
1195 | void *data; | |
1196 | }; | |
1197 | ||
1198 | static int notesize(struct memelfnote *en) | |
1199 | { | |
1200 | int sz; | |
1201 | ||
1202 | sz = sizeof(struct elf_note); | |
1203 | sz += roundup(strlen(en->name) + 1, 4); | |
1204 | sz += roundup(en->datasz, 4); | |
1205 | ||
1206 | return sz; | |
1207 | } | |
1208 | ||
1209 | #define DUMP_WRITE(addr, nr) \ | |
1210 | do { if (!dump_write(file, (addr), (nr))) return 0; } while(0) | |
1211 | #define DUMP_SEEK(off) \ | |
1212 | do { if (!dump_seek(file, (off))) return 0; } while(0) | |
1213 | ||
1214 | static int writenote(struct memelfnote *men, struct file *file) | |
1215 | { | |
1216 | struct elf_note en; | |
1217 | ||
1218 | en.n_namesz = strlen(men->name) + 1; | |
1219 | en.n_descsz = men->datasz; | |
1220 | en.n_type = men->type; | |
1221 | ||
1222 | DUMP_WRITE(&en, sizeof(en)); | |
1223 | DUMP_WRITE(men->name, en.n_namesz); | |
1224 | /* XXX - cast from long long to long to avoid need for libgcc.a */ | |
1225 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ | |
1226 | DUMP_WRITE(men->data, men->datasz); | |
1227 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ | |
1228 | ||
1229 | return 1; | |
1230 | } | |
1231 | #undef DUMP_WRITE | |
1232 | #undef DUMP_SEEK | |
1233 | ||
1234 | #define DUMP_WRITE(addr, nr) \ | |
1235 | if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \ | |
1236 | goto end_coredump; | |
1237 | #define DUMP_SEEK(off) \ | |
1238 | if (!dump_seek(file, (off))) \ | |
1239 | goto end_coredump; | |
1240 | ||
858119e1 | 1241 | static void fill_elf_header(struct elfhdr *elf, int segs) |
1da177e4 LT |
1242 | { |
1243 | memcpy(elf->e_ident, ELFMAG, SELFMAG); | |
1244 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1245 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1246 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1247 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1248 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); | |
1249 | ||
1250 | elf->e_type = ET_CORE; | |
1251 | elf->e_machine = ELF_ARCH; | |
1252 | elf->e_version = EV_CURRENT; | |
1253 | elf->e_entry = 0; | |
1254 | elf->e_phoff = sizeof(struct elfhdr); | |
1255 | elf->e_shoff = 0; | |
1256 | elf->e_flags = ELF_CORE_EFLAGS; | |
1257 | elf->e_ehsize = sizeof(struct elfhdr); | |
1258 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1259 | elf->e_phnum = segs; | |
1260 | elf->e_shentsize = 0; | |
1261 | elf->e_shnum = 0; | |
1262 | elf->e_shstrndx = 0; | |
1263 | return; | |
1264 | } | |
1265 | ||
8d6b5eee | 1266 | static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1da177e4 LT |
1267 | { |
1268 | phdr->p_type = PT_NOTE; | |
1269 | phdr->p_offset = offset; | |
1270 | phdr->p_vaddr = 0; | |
1271 | phdr->p_paddr = 0; | |
1272 | phdr->p_filesz = sz; | |
1273 | phdr->p_memsz = 0; | |
1274 | phdr->p_flags = 0; | |
1275 | phdr->p_align = 0; | |
1276 | return; | |
1277 | } | |
1278 | ||
1279 | static void fill_note(struct memelfnote *note, const char *name, int type, | |
1280 | unsigned int sz, void *data) | |
1281 | { | |
1282 | note->name = name; | |
1283 | note->type = type; | |
1284 | note->datasz = sz; | |
1285 | note->data = data; | |
1286 | return; | |
1287 | } | |
1288 | ||
1289 | /* | |
f4e5cc2c JJ |
1290 | * fill up all the fields in prstatus from the given task struct, except |
1291 | * registers which need to be filled up separately. | |
1da177e4 LT |
1292 | */ |
1293 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
f4e5cc2c | 1294 | struct task_struct *p, long signr) |
1da177e4 LT |
1295 | { |
1296 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1297 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1298 | prstatus->pr_sighold = p->blocked.sig[0]; | |
1299 | prstatus->pr_pid = p->pid; | |
1300 | prstatus->pr_ppid = p->parent->pid; | |
1301 | prstatus->pr_pgrp = process_group(p); | |
1302 | prstatus->pr_sid = p->signal->session; | |
1303 | if (thread_group_leader(p)) { | |
1304 | /* | |
1305 | * This is the record for the group leader. Add in the | |
1306 | * cumulative times of previous dead threads. This total | |
1307 | * won't include the time of each live thread whose state | |
1308 | * is included in the core dump. The final total reported | |
1309 | * to our parent process when it calls wait4 will include | |
1310 | * those sums as well as the little bit more time it takes | |
1311 | * this and each other thread to finish dying after the | |
1312 | * core dump synchronization phase. | |
1313 | */ | |
1314 | cputime_to_timeval(cputime_add(p->utime, p->signal->utime), | |
1315 | &prstatus->pr_utime); | |
1316 | cputime_to_timeval(cputime_add(p->stime, p->signal->stime), | |
1317 | &prstatus->pr_stime); | |
1318 | } else { | |
1319 | cputime_to_timeval(p->utime, &prstatus->pr_utime); | |
1320 | cputime_to_timeval(p->stime, &prstatus->pr_stime); | |
1321 | } | |
1322 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); | |
1323 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); | |
1324 | } | |
1325 | ||
1326 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1327 | struct mm_struct *mm) | |
1328 | { | |
a84a5059 | 1329 | unsigned int i, len; |
1da177e4 LT |
1330 | |
1331 | /* first copy the parameters from user space */ | |
1332 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1333 | ||
1334 | len = mm->arg_end - mm->arg_start; | |
1335 | if (len >= ELF_PRARGSZ) | |
1336 | len = ELF_PRARGSZ-1; | |
1337 | if (copy_from_user(&psinfo->pr_psargs, | |
1338 | (const char __user *)mm->arg_start, len)) | |
1339 | return -EFAULT; | |
1340 | for(i = 0; i < len; i++) | |
1341 | if (psinfo->pr_psargs[i] == 0) | |
1342 | psinfo->pr_psargs[i] = ' '; | |
1343 | psinfo->pr_psargs[len] = 0; | |
1344 | ||
1345 | psinfo->pr_pid = p->pid; | |
1346 | psinfo->pr_ppid = p->parent->pid; | |
1347 | psinfo->pr_pgrp = process_group(p); | |
1348 | psinfo->pr_sid = p->signal->session; | |
1349 | ||
1350 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1351 | psinfo->pr_state = i; | |
55148548 | 1352 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1da177e4 LT |
1353 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
1354 | psinfo->pr_nice = task_nice(p); | |
1355 | psinfo->pr_flag = p->flags; | |
1356 | SET_UID(psinfo->pr_uid, p->uid); | |
1357 | SET_GID(psinfo->pr_gid, p->gid); | |
1358 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); | |
1359 | ||
1360 | return 0; | |
1361 | } | |
1362 | ||
1363 | /* Here is the structure in which status of each thread is captured. */ | |
1364 | struct elf_thread_status | |
1365 | { | |
1366 | struct list_head list; | |
1367 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1368 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1369 | struct task_struct *thread; | |
1370 | #ifdef ELF_CORE_COPY_XFPREGS | |
1371 | elf_fpxregset_t xfpu; /* NT_PRXFPREG */ | |
1372 | #endif | |
1373 | struct memelfnote notes[3]; | |
1374 | int num_notes; | |
1375 | }; | |
1376 | ||
1377 | /* | |
1378 | * In order to add the specific thread information for the elf file format, | |
f4e5cc2c JJ |
1379 | * we need to keep a linked list of every threads pr_status and then create |
1380 | * a single section for them in the final core file. | |
1da177e4 LT |
1381 | */ |
1382 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1383 | { | |
1384 | int sz = 0; | |
1385 | struct task_struct *p = t->thread; | |
1386 | t->num_notes = 0; | |
1387 | ||
1388 | fill_prstatus(&t->prstatus, p, signr); | |
1389 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1390 | ||
f4e5cc2c JJ |
1391 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
1392 | &(t->prstatus)); | |
1da177e4 LT |
1393 | t->num_notes++; |
1394 | sz += notesize(&t->notes[0]); | |
1395 | ||
f4e5cc2c JJ |
1396 | if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, |
1397 | &t->fpu))) { | |
1398 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1399 | &(t->fpu)); | |
1da177e4 LT |
1400 | t->num_notes++; |
1401 | sz += notesize(&t->notes[1]); | |
1402 | } | |
1403 | ||
1404 | #ifdef ELF_CORE_COPY_XFPREGS | |
1405 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
f4e5cc2c JJ |
1406 | fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu), |
1407 | &t->xfpu); | |
1da177e4 LT |
1408 | t->num_notes++; |
1409 | sz += notesize(&t->notes[2]); | |
1410 | } | |
1411 | #endif | |
1412 | return sz; | |
1413 | } | |
1414 | ||
1415 | /* | |
1416 | * Actual dumper | |
1417 | * | |
1418 | * This is a two-pass process; first we find the offsets of the bits, | |
1419 | * and then they are actually written out. If we run out of core limit | |
1420 | * we just truncate. | |
1421 | */ | |
f4e5cc2c | 1422 | static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file) |
1da177e4 LT |
1423 | { |
1424 | #define NUM_NOTES 6 | |
1425 | int has_dumped = 0; | |
1426 | mm_segment_t fs; | |
1427 | int segs; | |
1428 | size_t size = 0; | |
1429 | int i; | |
1430 | struct vm_area_struct *vma; | |
1431 | struct elfhdr *elf = NULL; | |
8d6b5eee | 1432 | loff_t offset = 0, dataoff; |
1da177e4 LT |
1433 | unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur; |
1434 | int numnote; | |
1435 | struct memelfnote *notes = NULL; | |
1436 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ | |
1437 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ | |
1438 | struct task_struct *g, *p; | |
1439 | LIST_HEAD(thread_list); | |
1440 | struct list_head *t; | |
1441 | elf_fpregset_t *fpu = NULL; | |
1442 | #ifdef ELF_CORE_COPY_XFPREGS | |
1443 | elf_fpxregset_t *xfpu = NULL; | |
1444 | #endif | |
1445 | int thread_status_size = 0; | |
1446 | elf_addr_t *auxv; | |
1447 | ||
1448 | /* | |
1449 | * We no longer stop all VM operations. | |
1450 | * | |
f4e5cc2c JJ |
1451 | * This is because those proceses that could possibly change map_count |
1452 | * or the mmap / vma pages are now blocked in do_exit on current | |
1453 | * finishing this core dump. | |
1da177e4 LT |
1454 | * |
1455 | * Only ptrace can touch these memory addresses, but it doesn't change | |
f4e5cc2c | 1456 | * the map_count or the pages allocated. So no possibility of crashing |
1da177e4 LT |
1457 | * exists while dumping the mm->vm_next areas to the core file. |
1458 | */ | |
1459 | ||
1460 | /* alloc memory for large data structures: too large to be on stack */ | |
1461 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
1462 | if (!elf) | |
1463 | goto cleanup; | |
1464 | prstatus = kmalloc(sizeof(*prstatus), GFP_KERNEL); | |
1465 | if (!prstatus) | |
1466 | goto cleanup; | |
1467 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
1468 | if (!psinfo) | |
1469 | goto cleanup; | |
1470 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); | |
1471 | if (!notes) | |
1472 | goto cleanup; | |
1473 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); | |
1474 | if (!fpu) | |
1475 | goto cleanup; | |
1476 | #ifdef ELF_CORE_COPY_XFPREGS | |
1477 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); | |
1478 | if (!xfpu) | |
1479 | goto cleanup; | |
1480 | #endif | |
1481 | ||
1482 | if (signr) { | |
1483 | struct elf_thread_status *tmp; | |
1484 | read_lock(&tasklist_lock); | |
1485 | do_each_thread(g,p) | |
1486 | if (current->mm == p->mm && current != p) { | |
11b0b5ab | 1487 | tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC); |
1da177e4 LT |
1488 | if (!tmp) { |
1489 | read_unlock(&tasklist_lock); | |
1490 | goto cleanup; | |
1491 | } | |
1da177e4 LT |
1492 | INIT_LIST_HEAD(&tmp->list); |
1493 | tmp->thread = p; | |
1494 | list_add(&tmp->list, &thread_list); | |
1495 | } | |
1496 | while_each_thread(g,p); | |
1497 | read_unlock(&tasklist_lock); | |
1498 | list_for_each(t, &thread_list) { | |
1499 | struct elf_thread_status *tmp; | |
1500 | int sz; | |
1501 | ||
1502 | tmp = list_entry(t, struct elf_thread_status, list); | |
1503 | sz = elf_dump_thread_status(signr, tmp); | |
1504 | thread_status_size += sz; | |
1505 | } | |
1506 | } | |
1507 | /* now collect the dump for the current */ | |
1508 | memset(prstatus, 0, sizeof(*prstatus)); | |
1509 | fill_prstatus(prstatus, current, signr); | |
1510 | elf_core_copy_regs(&prstatus->pr_reg, regs); | |
1511 | ||
1512 | segs = current->mm->map_count; | |
1513 | #ifdef ELF_CORE_EXTRA_PHDRS | |
1514 | segs += ELF_CORE_EXTRA_PHDRS; | |
1515 | #endif | |
1516 | ||
1517 | /* Set up header */ | |
f4e5cc2c | 1518 | fill_elf_header(elf, segs + 1); /* including notes section */ |
1da177e4 LT |
1519 | |
1520 | has_dumped = 1; | |
1521 | current->flags |= PF_DUMPCORE; | |
1522 | ||
1523 | /* | |
1524 | * Set up the notes in similar form to SVR4 core dumps made | |
1525 | * with info from their /proc. | |
1526 | */ | |
1527 | ||
f4e5cc2c | 1528 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); |
1da177e4 | 1529 | fill_psinfo(psinfo, current->group_leader, current->mm); |
f4e5cc2c | 1530 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
1da177e4 | 1531 | |
a9289728 | 1532 | numnote = 2; |
1da177e4 | 1533 | |
f4e5cc2c | 1534 | auxv = (elf_addr_t *)current->mm->saved_auxv; |
1da177e4 LT |
1535 | |
1536 | i = 0; | |
1537 | do | |
1538 | i += 2; | |
1539 | while (auxv[i - 2] != AT_NULL); | |
1540 | fill_note(¬es[numnote++], "CORE", NT_AUXV, | |
f4e5cc2c | 1541 | i * sizeof(elf_addr_t), auxv); |
1da177e4 LT |
1542 | |
1543 | /* Try to dump the FPU. */ | |
f4e5cc2c JJ |
1544 | if ((prstatus->pr_fpvalid = |
1545 | elf_core_copy_task_fpregs(current, regs, fpu))) | |
1da177e4 LT |
1546 | fill_note(notes + numnote++, |
1547 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); | |
1548 | #ifdef ELF_CORE_COPY_XFPREGS | |
1549 | if (elf_core_copy_task_xfpregs(current, xfpu)) | |
1550 | fill_note(notes + numnote++, | |
1551 | "LINUX", NT_PRXFPREG, sizeof(*xfpu), xfpu); | |
1552 | #endif | |
1553 | ||
1554 | fs = get_fs(); | |
1555 | set_fs(KERNEL_DS); | |
1556 | ||
1557 | DUMP_WRITE(elf, sizeof(*elf)); | |
1558 | offset += sizeof(*elf); /* Elf header */ | |
1559 | offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */ | |
1560 | ||
1561 | /* Write notes phdr entry */ | |
1562 | { | |
1563 | struct elf_phdr phdr; | |
1564 | int sz = 0; | |
1565 | ||
1566 | for (i = 0; i < numnote; i++) | |
1567 | sz += notesize(notes + i); | |
1568 | ||
1569 | sz += thread_status_size; | |
1570 | ||
1571 | fill_elf_note_phdr(&phdr, sz, offset); | |
1572 | offset += sz; | |
1573 | DUMP_WRITE(&phdr, sizeof(phdr)); | |
1574 | } | |
1575 | ||
1576 | /* Page-align dumped data */ | |
1577 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); | |
1578 | ||
1579 | /* Write program headers for segments dump */ | |
1580 | for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) { | |
1581 | struct elf_phdr phdr; | |
1582 | size_t sz; | |
1583 | ||
1584 | sz = vma->vm_end - vma->vm_start; | |
1585 | ||
1586 | phdr.p_type = PT_LOAD; | |
1587 | phdr.p_offset = offset; | |
1588 | phdr.p_vaddr = vma->vm_start; | |
1589 | phdr.p_paddr = 0; | |
1590 | phdr.p_filesz = maydump(vma) ? sz : 0; | |
1591 | phdr.p_memsz = sz; | |
1592 | offset += phdr.p_filesz; | |
1593 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
f4e5cc2c JJ |
1594 | if (vma->vm_flags & VM_WRITE) |
1595 | phdr.p_flags |= PF_W; | |
1596 | if (vma->vm_flags & VM_EXEC) | |
1597 | phdr.p_flags |= PF_X; | |
1da177e4 LT |
1598 | phdr.p_align = ELF_EXEC_PAGESIZE; |
1599 | ||
1600 | DUMP_WRITE(&phdr, sizeof(phdr)); | |
1601 | } | |
1602 | ||
1603 | #ifdef ELF_CORE_WRITE_EXTRA_PHDRS | |
1604 | ELF_CORE_WRITE_EXTRA_PHDRS; | |
1605 | #endif | |
1606 | ||
1607 | /* write out the notes section */ | |
1608 | for (i = 0; i < numnote; i++) | |
1609 | if (!writenote(notes + i, file)) | |
1610 | goto end_coredump; | |
1611 | ||
1612 | /* write out the thread status notes section */ | |
1613 | list_for_each(t, &thread_list) { | |
f4e5cc2c JJ |
1614 | struct elf_thread_status *tmp = |
1615 | list_entry(t, struct elf_thread_status, list); | |
1616 | ||
1da177e4 LT |
1617 | for (i = 0; i < tmp->num_notes; i++) |
1618 | if (!writenote(&tmp->notes[i], file)) | |
1619 | goto end_coredump; | |
1620 | } | |
1621 | ||
1622 | DUMP_SEEK(dataoff); | |
1623 | ||
1624 | for (vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) { | |
1625 | unsigned long addr; | |
1626 | ||
1627 | if (!maydump(vma)) | |
1628 | continue; | |
1629 | ||
1630 | for (addr = vma->vm_start; | |
1631 | addr < vma->vm_end; | |
1632 | addr += PAGE_SIZE) { | |
f4e5cc2c | 1633 | struct page *page; |
1da177e4 LT |
1634 | struct vm_area_struct *vma; |
1635 | ||
1636 | if (get_user_pages(current, current->mm, addr, 1, 0, 1, | |
1637 | &page, &vma) <= 0) { | |
f4e5cc2c | 1638 | DUMP_SEEK(file->f_pos + PAGE_SIZE); |
1da177e4 LT |
1639 | } else { |
1640 | if (page == ZERO_PAGE(addr)) { | |
f4e5cc2c | 1641 | DUMP_SEEK(file->f_pos + PAGE_SIZE); |
1da177e4 LT |
1642 | } else { |
1643 | void *kaddr; | |
f4e5cc2c JJ |
1644 | flush_cache_page(vma, addr, |
1645 | page_to_pfn(page)); | |
1da177e4 LT |
1646 | kaddr = kmap(page); |
1647 | if ((size += PAGE_SIZE) > limit || | |
1648 | !dump_write(file, kaddr, | |
1649 | PAGE_SIZE)) { | |
1650 | kunmap(page); | |
1651 | page_cache_release(page); | |
1652 | goto end_coredump; | |
1653 | } | |
1654 | kunmap(page); | |
1655 | } | |
1656 | page_cache_release(page); | |
1657 | } | |
1658 | } | |
1659 | } | |
1660 | ||
1661 | #ifdef ELF_CORE_WRITE_EXTRA_DATA | |
1662 | ELF_CORE_WRITE_EXTRA_DATA; | |
1663 | #endif | |
1664 | ||
8d6b5eee | 1665 | if (file->f_pos != offset) { |
1da177e4 | 1666 | /* Sanity check */ |
f4e5cc2c | 1667 | printk(KERN_WARNING |
8d6b5eee AM |
1668 | "elf_core_dump: file->f_pos (%Ld) != offset (%Ld)\n", |
1669 | file->f_pos, offset); | |
1da177e4 LT |
1670 | } |
1671 | ||
1672 | end_coredump: | |
1673 | set_fs(fs); | |
1674 | ||
1675 | cleanup: | |
74da6cd0 | 1676 | while (!list_empty(&thread_list)) { |
1da177e4 LT |
1677 | struct list_head *tmp = thread_list.next; |
1678 | list_del(tmp); | |
1679 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
1680 | } | |
1681 | ||
1682 | kfree(elf); | |
1683 | kfree(prstatus); | |
1684 | kfree(psinfo); | |
1685 | kfree(notes); | |
1686 | kfree(fpu); | |
1687 | #ifdef ELF_CORE_COPY_XFPREGS | |
1688 | kfree(xfpu); | |
1689 | #endif | |
1690 | return has_dumped; | |
1691 | #undef NUM_NOTES | |
1692 | } | |
1693 | ||
1694 | #endif /* USE_ELF_CORE_DUMP */ | |
1695 | ||
1696 | static int __init init_elf_binfmt(void) | |
1697 | { | |
1698 | return register_binfmt(&elf_format); | |
1699 | } | |
1700 | ||
1701 | static void __exit exit_elf_binfmt(void) | |
1702 | { | |
1703 | /* Remove the COFF and ELF loaders. */ | |
1704 | unregister_binfmt(&elf_format); | |
1705 | } | |
1706 | ||
1707 | core_initcall(init_elf_binfmt); | |
1708 | module_exit(exit_elf_binfmt); | |
1709 | MODULE_LICENSE("GPL"); |