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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> | |
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> | |
1da177e4 LT |
34 | #include <linux/compiler.h> |
35 | #include <linux/highmem.h> | |
36 | #include <linux/pagemap.h> | |
37 | #include <linux/security.h> | |
38 | #include <linux/syscalls.h> | |
39 | #include <linux/random.h> | |
f4e5cc2c | 40 | #include <linux/elf.h> |
7e80d0d0 | 41 | #include <linux/utsname.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 *); | |
60bfba7e | 48 | static unsigned long elf_map (struct file *, unsigned long, struct elf_phdr *, int, int, unsigned long); |
1da177e4 | 49 | |
1da177e4 LT |
50 | /* |
51 | * If we don't support core dumping, then supply a NULL so we | |
52 | * don't even try. | |
53 | */ | |
708e9a79 | 54 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
f4e5cc2c | 55 | static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file); |
1da177e4 LT |
56 | #else |
57 | #define elf_core_dump NULL | |
58 | #endif | |
59 | ||
60 | #if ELF_EXEC_PAGESIZE > PAGE_SIZE | |
f4e5cc2c | 61 | #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE |
1da177e4 | 62 | #else |
f4e5cc2c | 63 | #define ELF_MIN_ALIGN PAGE_SIZE |
1da177e4 LT |
64 | #endif |
65 | ||
66 | #ifndef ELF_CORE_EFLAGS | |
67 | #define ELF_CORE_EFLAGS 0 | |
68 | #endif | |
69 | ||
70 | #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1)) | |
71 | #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1)) | |
72 | #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1)) | |
73 | ||
74 | static struct linux_binfmt elf_format = { | |
75 | .module = THIS_MODULE, | |
76 | .load_binary = load_elf_binary, | |
77 | .load_shlib = load_elf_library, | |
78 | .core_dump = elf_core_dump, | |
9fbbd4dd AK |
79 | .min_coredump = ELF_EXEC_PAGESIZE, |
80 | .hasvdso = 1 | |
1da177e4 LT |
81 | }; |
82 | ||
60bfba7e | 83 | #define BAD_ADDR(x) IS_ERR_VALUE(x) |
1da177e4 LT |
84 | |
85 | static int set_brk(unsigned long start, unsigned long end) | |
86 | { | |
87 | start = ELF_PAGEALIGN(start); | |
88 | end = ELF_PAGEALIGN(end); | |
89 | if (end > start) { | |
90 | unsigned long addr; | |
91 | down_write(¤t->mm->mmap_sem); | |
92 | addr = do_brk(start, end - start); | |
93 | up_write(¤t->mm->mmap_sem); | |
94 | if (BAD_ADDR(addr)) | |
95 | return addr; | |
96 | } | |
97 | current->mm->start_brk = current->mm->brk = end; | |
98 | return 0; | |
99 | } | |
100 | ||
1da177e4 LT |
101 | /* We need to explicitly zero any fractional pages |
102 | after the data section (i.e. bss). This would | |
103 | contain the junk from the file that should not | |
f4e5cc2c JJ |
104 | be in memory |
105 | */ | |
1da177e4 LT |
106 | static int padzero(unsigned long elf_bss) |
107 | { | |
108 | unsigned long nbyte; | |
109 | ||
110 | nbyte = ELF_PAGEOFFSET(elf_bss); | |
111 | if (nbyte) { | |
112 | nbyte = ELF_MIN_ALIGN - nbyte; | |
113 | if (clear_user((void __user *) elf_bss, nbyte)) | |
114 | return -EFAULT; | |
115 | } | |
116 | return 0; | |
117 | } | |
118 | ||
119 | /* Let's use some macros to make this stack manipulation a litle clearer */ | |
120 | #ifdef CONFIG_STACK_GROWSUP | |
121 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items)) | |
122 | #define STACK_ROUND(sp, items) \ | |
123 | ((15 + (unsigned long) ((sp) + (items))) &~ 15UL) | |
f4e5cc2c JJ |
124 | #define STACK_ALLOC(sp, len) ({ \ |
125 | elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \ | |
126 | old_sp; }) | |
1da177e4 LT |
127 | #else |
128 | #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items)) | |
129 | #define STACK_ROUND(sp, items) \ | |
130 | (((unsigned long) (sp - items)) &~ 15UL) | |
131 | #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; }) | |
132 | #endif | |
133 | ||
134 | static int | |
f4e5cc2c | 135 | create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec, |
1da177e4 LT |
136 | int interp_aout, unsigned long load_addr, |
137 | unsigned long interp_load_addr) | |
138 | { | |
139 | unsigned long p = bprm->p; | |
140 | int argc = bprm->argc; | |
141 | int envc = bprm->envc; | |
142 | elf_addr_t __user *argv; | |
143 | elf_addr_t __user *envp; | |
144 | elf_addr_t __user *sp; | |
145 | elf_addr_t __user *u_platform; | |
146 | const char *k_platform = ELF_PLATFORM; | |
147 | int items; | |
148 | elf_addr_t *elf_info; | |
149 | int ei_index = 0; | |
150 | struct task_struct *tsk = current; | |
b6a2fea3 | 151 | struct vm_area_struct *vma; |
1da177e4 LT |
152 | |
153 | /* | |
154 | * If this architecture has a platform capability string, copy it | |
155 | * to userspace. In some cases (Sparc), this info is impossible | |
156 | * for userspace to get any other way, in others (i386) it is | |
157 | * merely difficult. | |
158 | */ | |
1da177e4 LT |
159 | u_platform = NULL; |
160 | if (k_platform) { | |
161 | size_t len = strlen(k_platform) + 1; | |
162 | ||
163 | /* | |
164 | * In some cases (e.g. Hyper-Threading), we want to avoid L1 | |
165 | * evictions by the processes running on the same package. One | |
166 | * thing we can do is to shuffle the initial stack for them. | |
167 | */ | |
f4e5cc2c | 168 | |
1da177e4 LT |
169 | p = arch_align_stack(p); |
170 | ||
171 | u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len); | |
172 | if (__copy_to_user(u_platform, k_platform, len)) | |
173 | return -EFAULT; | |
174 | } | |
175 | ||
176 | /* Create the ELF interpreter info */ | |
785d5570 | 177 | elf_info = (elf_addr_t *)current->mm->saved_auxv; |
1da177e4 | 178 | #define NEW_AUX_ENT(id, val) \ |
f4e5cc2c | 179 | do { \ |
785d5570 JJ |
180 | elf_info[ei_index++] = id; \ |
181 | elf_info[ei_index++] = val; \ | |
f4e5cc2c | 182 | } while (0) |
1da177e4 LT |
183 | |
184 | #ifdef ARCH_DLINFO | |
185 | /* | |
186 | * ARCH_DLINFO must come first so PPC can do its special alignment of | |
187 | * AUXV. | |
188 | */ | |
189 | ARCH_DLINFO; | |
190 | #endif | |
191 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); | |
192 | NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE); | |
193 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
194 | NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff); | |
f4e5cc2c | 195 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
1da177e4 LT |
196 | NEW_AUX_ENT(AT_PHNUM, exec->e_phnum); |
197 | NEW_AUX_ENT(AT_BASE, interp_load_addr); | |
198 | NEW_AUX_ENT(AT_FLAGS, 0); | |
199 | NEW_AUX_ENT(AT_ENTRY, exec->e_entry); | |
785d5570 JJ |
200 | NEW_AUX_ENT(AT_UID, tsk->uid); |
201 | NEW_AUX_ENT(AT_EUID, tsk->euid); | |
202 | NEW_AUX_ENT(AT_GID, tsk->gid); | |
203 | NEW_AUX_ENT(AT_EGID, tsk->egid); | |
204 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); | |
1da177e4 | 205 | if (k_platform) { |
f4e5cc2c | 206 | NEW_AUX_ENT(AT_PLATFORM, |
785d5570 | 207 | (elf_addr_t)(unsigned long)u_platform); |
1da177e4 LT |
208 | } |
209 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { | |
785d5570 | 210 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); |
1da177e4 LT |
211 | } |
212 | #undef NEW_AUX_ENT | |
213 | /* AT_NULL is zero; clear the rest too */ | |
214 | memset(&elf_info[ei_index], 0, | |
215 | sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]); | |
216 | ||
217 | /* And advance past the AT_NULL entry. */ | |
218 | ei_index += 2; | |
219 | ||
220 | sp = STACK_ADD(p, ei_index); | |
221 | ||
222 | items = (argc + 1) + (envc + 1); | |
223 | if (interp_aout) { | |
224 | items += 3; /* a.out interpreters require argv & envp too */ | |
225 | } else { | |
226 | items += 1; /* ELF interpreters only put argc on the stack */ | |
227 | } | |
228 | bprm->p = STACK_ROUND(sp, items); | |
229 | ||
230 | /* Point sp at the lowest address on the stack */ | |
231 | #ifdef CONFIG_STACK_GROWSUP | |
232 | sp = (elf_addr_t __user *)bprm->p - items - ei_index; | |
f4e5cc2c | 233 | bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */ |
1da177e4 LT |
234 | #else |
235 | sp = (elf_addr_t __user *)bprm->p; | |
236 | #endif | |
237 | ||
b6a2fea3 OW |
238 | |
239 | /* | |
240 | * Grow the stack manually; some architectures have a limit on how | |
241 | * far ahead a user-space access may be in order to grow the stack. | |
242 | */ | |
243 | vma = find_extend_vma(current->mm, bprm->p); | |
244 | if (!vma) | |
245 | return -EFAULT; | |
246 | ||
1da177e4 LT |
247 | /* Now, let's put argc (and argv, envp if appropriate) on the stack */ |
248 | if (__put_user(argc, sp++)) | |
249 | return -EFAULT; | |
250 | if (interp_aout) { | |
251 | argv = sp + 2; | |
252 | envp = argv + argc + 1; | |
841d5fb7 HC |
253 | if (__put_user((elf_addr_t)(unsigned long)argv, sp++) || |
254 | __put_user((elf_addr_t)(unsigned long)envp, sp++)) | |
255 | return -EFAULT; | |
1da177e4 LT |
256 | } else { |
257 | argv = sp; | |
258 | envp = argv + argc + 1; | |
259 | } | |
260 | ||
261 | /* Populate argv and envp */ | |
a84a5059 | 262 | p = current->mm->arg_end = current->mm->arg_start; |
1da177e4 LT |
263 | while (argc-- > 0) { |
264 | size_t len; | |
841d5fb7 HC |
265 | if (__put_user((elf_addr_t)p, argv++)) |
266 | return -EFAULT; | |
b6a2fea3 OW |
267 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
268 | if (!len || len > MAX_ARG_STRLEN) | |
1da177e4 LT |
269 | return 0; |
270 | p += len; | |
271 | } | |
272 | if (__put_user(0, argv)) | |
273 | return -EFAULT; | |
274 | current->mm->arg_end = current->mm->env_start = p; | |
275 | while (envc-- > 0) { | |
276 | size_t len; | |
841d5fb7 HC |
277 | if (__put_user((elf_addr_t)p, envp++)) |
278 | return -EFAULT; | |
b6a2fea3 OW |
279 | len = strnlen_user((void __user *)p, MAX_ARG_STRLEN); |
280 | if (!len || len > MAX_ARG_STRLEN) | |
1da177e4 LT |
281 | return 0; |
282 | p += len; | |
283 | } | |
284 | if (__put_user(0, envp)) | |
285 | return -EFAULT; | |
286 | current->mm->env_end = p; | |
287 | ||
288 | /* Put the elf_info on the stack in the right place. */ | |
289 | sp = (elf_addr_t __user *)envp + 1; | |
290 | if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t))) | |
291 | return -EFAULT; | |
292 | return 0; | |
293 | } | |
294 | ||
295 | #ifndef elf_map | |
296 | ||
297 | static unsigned long elf_map(struct file *filep, unsigned long addr, | |
60bfba7e JK |
298 | struct elf_phdr *eppnt, int prot, int type, |
299 | unsigned long total_size) | |
1da177e4 LT |
300 | { |
301 | unsigned long map_addr; | |
60bfba7e JK |
302 | unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr); |
303 | unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr); | |
304 | addr = ELF_PAGESTART(addr); | |
305 | size = ELF_PAGEALIGN(size); | |
1da177e4 | 306 | |
dda6ebde DG |
307 | /* mmap() will return -EINVAL if given a zero size, but a |
308 | * segment with zero filesize is perfectly valid */ | |
60bfba7e JK |
309 | if (!size) |
310 | return addr; | |
311 | ||
312 | down_write(¤t->mm->mmap_sem); | |
313 | /* | |
314 | * total_size is the size of the ELF (interpreter) image. | |
315 | * The _first_ mmap needs to know the full size, otherwise | |
316 | * randomization might put this image into an overlapping | |
317 | * position with the ELF binary image. (since size < total_size) | |
318 | * So we first map the 'big' image - and unmap the remainder at | |
319 | * the end. (which unmap is needed for ELF images with holes.) | |
320 | */ | |
321 | if (total_size) { | |
322 | total_size = ELF_PAGEALIGN(total_size); | |
323 | map_addr = do_mmap(filep, addr, total_size, prot, type, off); | |
324 | if (!BAD_ADDR(map_addr)) | |
325 | do_munmap(current->mm, map_addr+size, total_size-size); | |
326 | } else | |
327 | map_addr = do_mmap(filep, addr, size, prot, type, off); | |
328 | ||
1da177e4 LT |
329 | up_write(¤t->mm->mmap_sem); |
330 | return(map_addr); | |
331 | } | |
332 | ||
333 | #endif /* !elf_map */ | |
334 | ||
60bfba7e JK |
335 | static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr) |
336 | { | |
337 | int i, first_idx = -1, last_idx = -1; | |
338 | ||
339 | for (i = 0; i < nr; i++) { | |
340 | if (cmds[i].p_type == PT_LOAD) { | |
341 | last_idx = i; | |
342 | if (first_idx == -1) | |
343 | first_idx = i; | |
344 | } | |
345 | } | |
346 | if (first_idx == -1) | |
347 | return 0; | |
348 | ||
349 | return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz - | |
350 | ELF_PAGESTART(cmds[first_idx].p_vaddr); | |
351 | } | |
352 | ||
353 | ||
1da177e4 LT |
354 | /* This is much more generalized than the library routine read function, |
355 | so we keep this separate. Technically the library read function | |
356 | is only provided so that we can read a.out libraries that have | |
357 | an ELF header */ | |
358 | ||
f4e5cc2c | 359 | static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex, |
60bfba7e JK |
360 | struct file *interpreter, unsigned long *interp_map_addr, |
361 | unsigned long no_base) | |
1da177e4 LT |
362 | { |
363 | struct elf_phdr *elf_phdata; | |
364 | struct elf_phdr *eppnt; | |
365 | unsigned long load_addr = 0; | |
366 | int load_addr_set = 0; | |
367 | unsigned long last_bss = 0, elf_bss = 0; | |
368 | unsigned long error = ~0UL; | |
60bfba7e | 369 | unsigned long total_size; |
1da177e4 LT |
370 | int retval, i, size; |
371 | ||
372 | /* First of all, some simple consistency checks */ | |
373 | if (interp_elf_ex->e_type != ET_EXEC && | |
374 | interp_elf_ex->e_type != ET_DYN) | |
375 | goto out; | |
376 | if (!elf_check_arch(interp_elf_ex)) | |
377 | goto out; | |
378 | if (!interpreter->f_op || !interpreter->f_op->mmap) | |
379 | goto out; | |
380 | ||
381 | /* | |
382 | * If the size of this structure has changed, then punt, since | |
383 | * we will be doing the wrong thing. | |
384 | */ | |
385 | if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) | |
386 | goto out; | |
387 | if (interp_elf_ex->e_phnum < 1 || | |
388 | interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr)) | |
389 | goto out; | |
390 | ||
391 | /* Now read in all of the header information */ | |
1da177e4 LT |
392 | size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum; |
393 | if (size > ELF_MIN_ALIGN) | |
394 | goto out; | |
f4e5cc2c | 395 | elf_phdata = kmalloc(size, GFP_KERNEL); |
1da177e4 LT |
396 | if (!elf_phdata) |
397 | goto out; | |
398 | ||
f4e5cc2c JJ |
399 | retval = kernel_read(interpreter, interp_elf_ex->e_phoff, |
400 | (char *)elf_phdata,size); | |
1da177e4 LT |
401 | error = -EIO; |
402 | if (retval != size) { | |
403 | if (retval < 0) | |
404 | error = retval; | |
405 | goto out_close; | |
406 | } | |
407 | ||
60bfba7e JK |
408 | total_size = total_mapping_size(elf_phdata, interp_elf_ex->e_phnum); |
409 | if (!total_size) { | |
410 | error = -EINVAL; | |
411 | goto out_close; | |
412 | } | |
413 | ||
1da177e4 | 414 | eppnt = elf_phdata; |
f4e5cc2c JJ |
415 | for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) { |
416 | if (eppnt->p_type == PT_LOAD) { | |
417 | int elf_type = MAP_PRIVATE | MAP_DENYWRITE; | |
418 | int elf_prot = 0; | |
419 | unsigned long vaddr = 0; | |
420 | unsigned long k, map_addr; | |
421 | ||
422 | if (eppnt->p_flags & PF_R) | |
423 | elf_prot = PROT_READ; | |
424 | if (eppnt->p_flags & PF_W) | |
425 | elf_prot |= PROT_WRITE; | |
426 | if (eppnt->p_flags & PF_X) | |
427 | elf_prot |= PROT_EXEC; | |
428 | vaddr = eppnt->p_vaddr; | |
429 | if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) | |
430 | elf_type |= MAP_FIXED; | |
60bfba7e JK |
431 | else if (no_base && interp_elf_ex->e_type == ET_DYN) |
432 | load_addr = -vaddr; | |
f4e5cc2c JJ |
433 | |
434 | map_addr = elf_map(interpreter, load_addr + vaddr, | |
60bfba7e JK |
435 | eppnt, elf_prot, elf_type, total_size); |
436 | total_size = 0; | |
437 | if (!*interp_map_addr) | |
438 | *interp_map_addr = map_addr; | |
f4e5cc2c JJ |
439 | error = map_addr; |
440 | if (BAD_ADDR(map_addr)) | |
441 | goto out_close; | |
442 | ||
443 | if (!load_addr_set && | |
444 | interp_elf_ex->e_type == ET_DYN) { | |
445 | load_addr = map_addr - ELF_PAGESTART(vaddr); | |
446 | load_addr_set = 1; | |
447 | } | |
448 | ||
449 | /* | |
450 | * Check to see if the section's size will overflow the | |
451 | * allowed task size. Note that p_filesz must always be | |
452 | * <= p_memsize so it's only necessary to check p_memsz. | |
453 | */ | |
454 | k = load_addr + eppnt->p_vaddr; | |
ce51059b | 455 | if (BAD_ADDR(k) || |
f4e5cc2c JJ |
456 | eppnt->p_filesz > eppnt->p_memsz || |
457 | eppnt->p_memsz > TASK_SIZE || | |
458 | TASK_SIZE - eppnt->p_memsz < k) { | |
459 | error = -ENOMEM; | |
460 | goto out_close; | |
461 | } | |
462 | ||
463 | /* | |
464 | * Find the end of the file mapping for this phdr, and | |
465 | * keep track of the largest address we see for this. | |
466 | */ | |
467 | k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; | |
468 | if (k > elf_bss) | |
469 | elf_bss = k; | |
470 | ||
471 | /* | |
472 | * Do the same thing for the memory mapping - between | |
473 | * elf_bss and last_bss is the bss section. | |
474 | */ | |
475 | k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; | |
476 | if (k > last_bss) | |
477 | last_bss = k; | |
478 | } | |
1da177e4 LT |
479 | } |
480 | ||
481 | /* | |
482 | * Now fill out the bss section. First pad the last page up | |
483 | * to the page boundary, and then perform a mmap to make sure | |
484 | * that there are zero-mapped pages up to and including the | |
485 | * last bss page. | |
486 | */ | |
487 | if (padzero(elf_bss)) { | |
488 | error = -EFAULT; | |
489 | goto out_close; | |
490 | } | |
491 | ||
f4e5cc2c JJ |
492 | /* What we have mapped so far */ |
493 | elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1); | |
1da177e4 LT |
494 | |
495 | /* Map the last of the bss segment */ | |
496 | if (last_bss > elf_bss) { | |
497 | down_write(¤t->mm->mmap_sem); | |
498 | error = do_brk(elf_bss, last_bss - elf_bss); | |
499 | up_write(¤t->mm->mmap_sem); | |
500 | if (BAD_ADDR(error)) | |
501 | goto out_close; | |
502 | } | |
503 | ||
60bfba7e | 504 | error = load_addr; |
1da177e4 LT |
505 | |
506 | out_close: | |
507 | kfree(elf_phdata); | |
508 | out: | |
509 | return error; | |
510 | } | |
511 | ||
f4e5cc2c JJ |
512 | static unsigned long load_aout_interp(struct exec *interp_ex, |
513 | struct file *interpreter) | |
1da177e4 LT |
514 | { |
515 | unsigned long text_data, elf_entry = ~0UL; | |
516 | char __user * addr; | |
517 | loff_t offset; | |
518 | ||
519 | current->mm->end_code = interp_ex->a_text; | |
520 | text_data = interp_ex->a_text + interp_ex->a_data; | |
521 | current->mm->end_data = text_data; | |
522 | current->mm->brk = interp_ex->a_bss + text_data; | |
523 | ||
524 | switch (N_MAGIC(*interp_ex)) { | |
525 | case OMAGIC: | |
526 | offset = 32; | |
527 | addr = (char __user *)0; | |
528 | break; | |
529 | case ZMAGIC: | |
530 | case QMAGIC: | |
531 | offset = N_TXTOFF(*interp_ex); | |
f4e5cc2c | 532 | addr = (char __user *)N_TXTADDR(*interp_ex); |
1da177e4 LT |
533 | break; |
534 | default: | |
535 | goto out; | |
536 | } | |
537 | ||
538 | down_write(¤t->mm->mmap_sem); | |
539 | do_brk(0, text_data); | |
540 | up_write(¤t->mm->mmap_sem); | |
541 | if (!interpreter->f_op || !interpreter->f_op->read) | |
542 | goto out; | |
543 | if (interpreter->f_op->read(interpreter, addr, text_data, &offset) < 0) | |
544 | goto out; | |
545 | flush_icache_range((unsigned long)addr, | |
546 | (unsigned long)addr + text_data); | |
547 | ||
1da177e4 LT |
548 | down_write(¤t->mm->mmap_sem); |
549 | do_brk(ELF_PAGESTART(text_data + ELF_MIN_ALIGN - 1), | |
550 | interp_ex->a_bss); | |
551 | up_write(¤t->mm->mmap_sem); | |
552 | elf_entry = interp_ex->a_entry; | |
553 | ||
554 | out: | |
555 | return elf_entry; | |
556 | } | |
557 | ||
558 | /* | |
559 | * These are the functions used to load ELF style executables and shared | |
560 | * libraries. There is no binary dependent code anywhere else. | |
561 | */ | |
562 | ||
563 | #define INTERPRETER_NONE 0 | |
564 | #define INTERPRETER_AOUT 1 | |
565 | #define INTERPRETER_ELF 2 | |
566 | ||
913bd906 | 567 | #ifndef STACK_RND_MASK |
d1cabd63 | 568 | #define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) /* 8MB of VA */ |
913bd906 | 569 | #endif |
1da177e4 LT |
570 | |
571 | static unsigned long randomize_stack_top(unsigned long stack_top) | |
572 | { | |
573 | unsigned int random_variable = 0; | |
574 | ||
c16b63e0 AK |
575 | if ((current->flags & PF_RANDOMIZE) && |
576 | !(current->personality & ADDR_NO_RANDOMIZE)) { | |
913bd906 AK |
577 | random_variable = get_random_int() & STACK_RND_MASK; |
578 | random_variable <<= PAGE_SHIFT; | |
579 | } | |
1da177e4 | 580 | #ifdef CONFIG_STACK_GROWSUP |
913bd906 | 581 | return PAGE_ALIGN(stack_top) + random_variable; |
1da177e4 | 582 | #else |
913bd906 | 583 | return PAGE_ALIGN(stack_top) - random_variable; |
1da177e4 LT |
584 | #endif |
585 | } | |
586 | ||
f4e5cc2c | 587 | static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs) |
1da177e4 LT |
588 | { |
589 | struct file *interpreter = NULL; /* to shut gcc up */ | |
590 | unsigned long load_addr = 0, load_bias = 0; | |
591 | int load_addr_set = 0; | |
592 | char * elf_interpreter = NULL; | |
593 | unsigned int interpreter_type = INTERPRETER_NONE; | |
594 | unsigned char ibcs2_interpreter = 0; | |
595 | unsigned long error; | |
f4e5cc2c | 596 | struct elf_phdr *elf_ppnt, *elf_phdata; |
1da177e4 LT |
597 | unsigned long elf_bss, elf_brk; |
598 | int elf_exec_fileno; | |
599 | int retval, i; | |
600 | unsigned int size; | |
60bfba7e JK |
601 | unsigned long elf_entry; |
602 | unsigned long interp_load_addr = 0; | |
1da177e4 LT |
603 | unsigned long start_code, end_code, start_data, end_data; |
604 | unsigned long reloc_func_desc = 0; | |
605 | char passed_fileno[6]; | |
606 | struct files_struct *files; | |
8de61e69 | 607 | int executable_stack = EXSTACK_DEFAULT; |
1da177e4 LT |
608 | unsigned long def_flags = 0; |
609 | struct { | |
610 | struct elfhdr elf_ex; | |
611 | struct elfhdr interp_elf_ex; | |
612 | struct exec interp_ex; | |
613 | } *loc; | |
614 | ||
615 | loc = kmalloc(sizeof(*loc), GFP_KERNEL); | |
616 | if (!loc) { | |
617 | retval = -ENOMEM; | |
618 | goto out_ret; | |
619 | } | |
620 | ||
621 | /* Get the exec-header */ | |
f4e5cc2c | 622 | loc->elf_ex = *((struct elfhdr *)bprm->buf); |
1da177e4 LT |
623 | |
624 | retval = -ENOEXEC; | |
625 | /* First of all, some simple consistency checks */ | |
626 | if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
627 | goto out; | |
628 | ||
629 | if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN) | |
630 | goto out; | |
631 | if (!elf_check_arch(&loc->elf_ex)) | |
632 | goto out; | |
633 | if (!bprm->file->f_op||!bprm->file->f_op->mmap) | |
634 | goto out; | |
635 | ||
636 | /* Now read in all of the header information */ | |
1da177e4 LT |
637 | if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr)) |
638 | goto out; | |
639 | if (loc->elf_ex.e_phnum < 1 || | |
640 | loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr)) | |
641 | goto out; | |
642 | size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr); | |
643 | retval = -ENOMEM; | |
f4e5cc2c | 644 | elf_phdata = kmalloc(size, GFP_KERNEL); |
1da177e4 LT |
645 | if (!elf_phdata) |
646 | goto out; | |
647 | ||
f4e5cc2c JJ |
648 | retval = kernel_read(bprm->file, loc->elf_ex.e_phoff, |
649 | (char *)elf_phdata, size); | |
1da177e4 LT |
650 | if (retval != size) { |
651 | if (retval >= 0) | |
652 | retval = -EIO; | |
653 | goto out_free_ph; | |
654 | } | |
655 | ||
f4e5cc2c | 656 | files = current->files; /* Refcounted so ok */ |
1da177e4 LT |
657 | retval = unshare_files(); |
658 | if (retval < 0) | |
659 | goto out_free_ph; | |
660 | if (files == current->files) { | |
661 | put_files_struct(files); | |
662 | files = NULL; | |
663 | } | |
664 | ||
665 | /* exec will make our files private anyway, but for the a.out | |
666 | loader stuff we need to do it earlier */ | |
1da177e4 LT |
667 | retval = get_unused_fd(); |
668 | if (retval < 0) | |
669 | goto out_free_fh; | |
670 | get_file(bprm->file); | |
671 | fd_install(elf_exec_fileno = retval, bprm->file); | |
672 | ||
673 | elf_ppnt = elf_phdata; | |
674 | elf_bss = 0; | |
675 | elf_brk = 0; | |
676 | ||
677 | start_code = ~0UL; | |
678 | end_code = 0; | |
679 | start_data = 0; | |
680 | end_data = 0; | |
681 | ||
682 | for (i = 0; i < loc->elf_ex.e_phnum; i++) { | |
683 | if (elf_ppnt->p_type == PT_INTERP) { | |
684 | /* This is the program interpreter used for | |
685 | * shared libraries - for now assume that this | |
686 | * is an a.out format binary | |
687 | */ | |
1da177e4 LT |
688 | retval = -ENOEXEC; |
689 | if (elf_ppnt->p_filesz > PATH_MAX || | |
690 | elf_ppnt->p_filesz < 2) | |
691 | goto out_free_file; | |
692 | ||
693 | retval = -ENOMEM; | |
792db3af | 694 | elf_interpreter = kmalloc(elf_ppnt->p_filesz, |
f4e5cc2c | 695 | GFP_KERNEL); |
1da177e4 LT |
696 | if (!elf_interpreter) |
697 | goto out_free_file; | |
698 | ||
699 | retval = kernel_read(bprm->file, elf_ppnt->p_offset, | |
f4e5cc2c JJ |
700 | elf_interpreter, |
701 | elf_ppnt->p_filesz); | |
1da177e4 LT |
702 | if (retval != elf_ppnt->p_filesz) { |
703 | if (retval >= 0) | |
704 | retval = -EIO; | |
705 | goto out_free_interp; | |
706 | } | |
707 | /* make sure path is NULL terminated */ | |
708 | retval = -ENOEXEC; | |
709 | if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0') | |
710 | goto out_free_interp; | |
711 | ||
712 | /* If the program interpreter is one of these two, | |
713 | * then assume an iBCS2 image. Otherwise assume | |
714 | * a native linux image. | |
715 | */ | |
716 | if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 || | |
717 | strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) | |
718 | ibcs2_interpreter = 1; | |
719 | ||
720 | /* | |
721 | * The early SET_PERSONALITY here is so that the lookup | |
722 | * for the interpreter happens in the namespace of the | |
723 | * to-be-execed image. SET_PERSONALITY can select an | |
724 | * alternate root. | |
725 | * | |
726 | * However, SET_PERSONALITY is NOT allowed to switch | |
727 | * this task into the new images's memory mapping | |
728 | * policy - that is, TASK_SIZE must still evaluate to | |
729 | * that which is appropriate to the execing application. | |
730 | * This is because exit_mmap() needs to have TASK_SIZE | |
731 | * evaluate to the size of the old image. | |
732 | * | |
733 | * So if (say) a 64-bit application is execing a 32-bit | |
734 | * application it is the architecture's responsibility | |
735 | * to defer changing the value of TASK_SIZE until the | |
736 | * switch really is going to happen - do this in | |
737 | * flush_thread(). - akpm | |
738 | */ | |
739 | SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter); | |
740 | ||
741 | interpreter = open_exec(elf_interpreter); | |
742 | retval = PTR_ERR(interpreter); | |
743 | if (IS_ERR(interpreter)) | |
744 | goto out_free_interp; | |
1fb84496 AD |
745 | |
746 | /* | |
747 | * If the binary is not readable then enforce | |
748 | * mm->dumpable = 0 regardless of the interpreter's | |
749 | * permissions. | |
750 | */ | |
751 | if (file_permission(interpreter, MAY_READ) < 0) | |
752 | bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; | |
753 | ||
f4e5cc2c JJ |
754 | retval = kernel_read(interpreter, 0, bprm->buf, |
755 | BINPRM_BUF_SIZE); | |
1da177e4 LT |
756 | if (retval != BINPRM_BUF_SIZE) { |
757 | if (retval >= 0) | |
758 | retval = -EIO; | |
759 | goto out_free_dentry; | |
760 | } | |
761 | ||
762 | /* Get the exec headers */ | |
f4e5cc2c JJ |
763 | loc->interp_ex = *((struct exec *)bprm->buf); |
764 | loc->interp_elf_ex = *((struct elfhdr *)bprm->buf); | |
1da177e4 LT |
765 | break; |
766 | } | |
767 | elf_ppnt++; | |
768 | } | |
769 | ||
770 | elf_ppnt = elf_phdata; | |
771 | for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++) | |
772 | if (elf_ppnt->p_type == PT_GNU_STACK) { | |
773 | if (elf_ppnt->p_flags & PF_X) | |
774 | executable_stack = EXSTACK_ENABLE_X; | |
775 | else | |
776 | executable_stack = EXSTACK_DISABLE_X; | |
777 | break; | |
778 | } | |
1da177e4 LT |
779 | |
780 | /* Some simple consistency checks for the interpreter */ | |
781 | if (elf_interpreter) { | |
782 | interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT; | |
783 | ||
784 | /* Now figure out which format our binary is */ | |
785 | if ((N_MAGIC(loc->interp_ex) != OMAGIC) && | |
786 | (N_MAGIC(loc->interp_ex) != ZMAGIC) && | |
787 | (N_MAGIC(loc->interp_ex) != QMAGIC)) | |
788 | interpreter_type = INTERPRETER_ELF; | |
789 | ||
790 | if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
791 | interpreter_type &= ~INTERPRETER_ELF; | |
792 | ||
793 | retval = -ELIBBAD; | |
794 | if (!interpreter_type) | |
795 | goto out_free_dentry; | |
796 | ||
797 | /* Make sure only one type was selected */ | |
798 | if ((interpreter_type & INTERPRETER_ELF) && | |
799 | interpreter_type != INTERPRETER_ELF) { | |
800 | // FIXME - ratelimit this before re-enabling | |
801 | // printk(KERN_WARNING "ELF: Ambiguous type, using ELF\n"); | |
802 | interpreter_type = INTERPRETER_ELF; | |
803 | } | |
804 | /* Verify the interpreter has a valid arch */ | |
805 | if ((interpreter_type == INTERPRETER_ELF) && | |
806 | !elf_check_arch(&loc->interp_elf_ex)) | |
807 | goto out_free_dentry; | |
808 | } else { | |
809 | /* Executables without an interpreter also need a personality */ | |
810 | SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter); | |
811 | } | |
812 | ||
813 | /* OK, we are done with that, now set up the arg stuff, | |
814 | and then start this sucker up */ | |
1da177e4 LT |
815 | if ((!bprm->sh_bang) && (interpreter_type == INTERPRETER_AOUT)) { |
816 | char *passed_p = passed_fileno; | |
817 | sprintf(passed_fileno, "%d", elf_exec_fileno); | |
818 | ||
819 | if (elf_interpreter) { | |
820 | retval = copy_strings_kernel(1, &passed_p, bprm); | |
821 | if (retval) | |
822 | goto out_free_dentry; | |
823 | bprm->argc++; | |
824 | } | |
825 | } | |
826 | ||
827 | /* Flush all traces of the currently running executable */ | |
828 | retval = flush_old_exec(bprm); | |
829 | if (retval) | |
830 | goto out_free_dentry; | |
831 | ||
832 | /* Discard our unneeded old files struct */ | |
833 | if (files) { | |
1da177e4 LT |
834 | put_files_struct(files); |
835 | files = NULL; | |
836 | } | |
837 | ||
838 | /* OK, This is the point of no return */ | |
1da177e4 LT |
839 | current->flags &= ~PF_FORKNOEXEC; |
840 | current->mm->def_flags = def_flags; | |
841 | ||
842 | /* Do this immediately, since STACK_TOP as used in setup_arg_pages | |
843 | may depend on the personality. */ | |
844 | SET_PERSONALITY(loc->elf_ex, ibcs2_interpreter); | |
845 | if (elf_read_implies_exec(loc->elf_ex, executable_stack)) | |
846 | current->personality |= READ_IMPLIES_EXEC; | |
847 | ||
f4e5cc2c | 848 | if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space) |
1da177e4 LT |
849 | current->flags |= PF_RANDOMIZE; |
850 | arch_pick_mmap_layout(current->mm); | |
851 | ||
852 | /* Do this so that we can load the interpreter, if need be. We will | |
853 | change some of these later */ | |
1da177e4 | 854 | current->mm->free_area_cache = current->mm->mmap_base; |
1363c3cd | 855 | current->mm->cached_hole_size = 0; |
1da177e4 LT |
856 | retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP), |
857 | executable_stack); | |
858 | if (retval < 0) { | |
859 | send_sig(SIGKILL, current, 0); | |
860 | goto out_free_dentry; | |
861 | } | |
862 | ||
1da177e4 LT |
863 | current->mm->start_stack = bprm->p; |
864 | ||
865 | /* Now we do a little grungy work by mmaping the ELF image into | |
60bfba7e | 866 | the correct location in memory. */ |
f4e5cc2c JJ |
867 | for(i = 0, elf_ppnt = elf_phdata; |
868 | i < loc->elf_ex.e_phnum; i++, elf_ppnt++) { | |
1da177e4 LT |
869 | int elf_prot = 0, elf_flags; |
870 | unsigned long k, vaddr; | |
871 | ||
872 | if (elf_ppnt->p_type != PT_LOAD) | |
873 | continue; | |
874 | ||
875 | if (unlikely (elf_brk > elf_bss)) { | |
876 | unsigned long nbyte; | |
877 | ||
878 | /* There was a PT_LOAD segment with p_memsz > p_filesz | |
879 | before this one. Map anonymous pages, if needed, | |
880 | and clear the area. */ | |
881 | retval = set_brk (elf_bss + load_bias, | |
882 | elf_brk + load_bias); | |
883 | if (retval) { | |
884 | send_sig(SIGKILL, current, 0); | |
885 | goto out_free_dentry; | |
886 | } | |
887 | nbyte = ELF_PAGEOFFSET(elf_bss); | |
888 | if (nbyte) { | |
889 | nbyte = ELF_MIN_ALIGN - nbyte; | |
890 | if (nbyte > elf_brk - elf_bss) | |
891 | nbyte = elf_brk - elf_bss; | |
892 | if (clear_user((void __user *)elf_bss + | |
893 | load_bias, nbyte)) { | |
894 | /* | |
895 | * This bss-zeroing can fail if the ELF | |
f4e5cc2c | 896 | * file specifies odd protections. So |
1da177e4 LT |
897 | * we don't check the return value |
898 | */ | |
899 | } | |
900 | } | |
901 | } | |
902 | ||
f4e5cc2c JJ |
903 | if (elf_ppnt->p_flags & PF_R) |
904 | elf_prot |= PROT_READ; | |
905 | if (elf_ppnt->p_flags & PF_W) | |
906 | elf_prot |= PROT_WRITE; | |
907 | if (elf_ppnt->p_flags & PF_X) | |
908 | elf_prot |= PROT_EXEC; | |
1da177e4 | 909 | |
f4e5cc2c | 910 | elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE; |
1da177e4 LT |
911 | |
912 | vaddr = elf_ppnt->p_vaddr; | |
913 | if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) { | |
914 | elf_flags |= MAP_FIXED; | |
915 | } else if (loc->elf_ex.e_type == ET_DYN) { | |
f4e5cc2c JJ |
916 | /* Try and get dynamic programs out of the way of the |
917 | * default mmap base, as well as whatever program they | |
918 | * might try to exec. This is because the brk will | |
919 | * follow the loader, and is not movable. */ | |
60bfba7e JK |
920 | #ifdef CONFIG_X86 |
921 | load_bias = 0; | |
922 | #else | |
90cb28e8 | 923 | load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr); |
60bfba7e | 924 | #endif |
1da177e4 LT |
925 | } |
926 | ||
f4e5cc2c | 927 | error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, |
60bfba7e | 928 | elf_prot, elf_flags,0); |
1da177e4 LT |
929 | if (BAD_ADDR(error)) { |
930 | send_sig(SIGKILL, current, 0); | |
b140f251 AK |
931 | retval = IS_ERR((void *)error) ? |
932 | PTR_ERR((void*)error) : -EINVAL; | |
1da177e4 LT |
933 | goto out_free_dentry; |
934 | } | |
935 | ||
936 | if (!load_addr_set) { | |
937 | load_addr_set = 1; | |
938 | load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset); | |
939 | if (loc->elf_ex.e_type == ET_DYN) { | |
940 | load_bias += error - | |
941 | ELF_PAGESTART(load_bias + vaddr); | |
942 | load_addr += load_bias; | |
943 | reloc_func_desc = load_bias; | |
944 | } | |
945 | } | |
946 | k = elf_ppnt->p_vaddr; | |
f4e5cc2c JJ |
947 | if (k < start_code) |
948 | start_code = k; | |
949 | if (start_data < k) | |
950 | start_data = k; | |
1da177e4 LT |
951 | |
952 | /* | |
953 | * Check to see if the section's size will overflow the | |
954 | * allowed task size. Note that p_filesz must always be | |
955 | * <= p_memsz so it is only necessary to check p_memsz. | |
956 | */ | |
ce51059b | 957 | if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz || |
1da177e4 LT |
958 | elf_ppnt->p_memsz > TASK_SIZE || |
959 | TASK_SIZE - elf_ppnt->p_memsz < k) { | |
f4e5cc2c | 960 | /* set_brk can never work. Avoid overflows. */ |
1da177e4 | 961 | send_sig(SIGKILL, current, 0); |
b140f251 | 962 | retval = -EINVAL; |
1da177e4 LT |
963 | goto out_free_dentry; |
964 | } | |
965 | ||
966 | k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; | |
967 | ||
968 | if (k > elf_bss) | |
969 | elf_bss = k; | |
970 | if ((elf_ppnt->p_flags & PF_X) && end_code < k) | |
971 | end_code = k; | |
972 | if (end_data < k) | |
973 | end_data = k; | |
974 | k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; | |
975 | if (k > elf_brk) | |
976 | elf_brk = k; | |
977 | } | |
978 | ||
979 | loc->elf_ex.e_entry += load_bias; | |
980 | elf_bss += load_bias; | |
981 | elf_brk += load_bias; | |
982 | start_code += load_bias; | |
983 | end_code += load_bias; | |
984 | start_data += load_bias; | |
985 | end_data += load_bias; | |
986 | ||
987 | /* Calling set_brk effectively mmaps the pages that we need | |
988 | * for the bss and break sections. We must do this before | |
989 | * mapping in the interpreter, to make sure it doesn't wind | |
990 | * up getting placed where the bss needs to go. | |
991 | */ | |
992 | retval = set_brk(elf_bss, elf_brk); | |
993 | if (retval) { | |
994 | send_sig(SIGKILL, current, 0); | |
995 | goto out_free_dentry; | |
996 | } | |
6de50517 | 997 | if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) { |
1da177e4 LT |
998 | send_sig(SIGSEGV, current, 0); |
999 | retval = -EFAULT; /* Nobody gets to see this, but.. */ | |
1000 | goto out_free_dentry; | |
1001 | } | |
1002 | ||
1003 | if (elf_interpreter) { | |
60bfba7e | 1004 | if (interpreter_type == INTERPRETER_AOUT) { |
1da177e4 LT |
1005 | elf_entry = load_aout_interp(&loc->interp_ex, |
1006 | interpreter); | |
60bfba7e | 1007 | } else { |
4d3b573a | 1008 | unsigned long uninitialized_var(interp_map_addr); |
60bfba7e | 1009 | |
1da177e4 LT |
1010 | elf_entry = load_elf_interp(&loc->interp_elf_ex, |
1011 | interpreter, | |
60bfba7e JK |
1012 | &interp_map_addr, |
1013 | load_bias); | |
1014 | if (!BAD_ADDR(elf_entry)) { | |
1015 | /* | |
1016 | * load_elf_interp() returns relocation | |
1017 | * adjustment | |
1018 | */ | |
1019 | interp_load_addr = elf_entry; | |
1020 | elf_entry += loc->interp_elf_ex.e_entry; | |
1021 | } | |
1022 | } | |
1da177e4 | 1023 | if (BAD_ADDR(elf_entry)) { |
1da177e4 | 1024 | force_sig(SIGSEGV, current); |
ce51059b CE |
1025 | retval = IS_ERR((void *)elf_entry) ? |
1026 | (int)elf_entry : -EINVAL; | |
1da177e4 LT |
1027 | goto out_free_dentry; |
1028 | } | |
1029 | reloc_func_desc = interp_load_addr; | |
1030 | ||
1031 | allow_write_access(interpreter); | |
1032 | fput(interpreter); | |
1033 | kfree(elf_interpreter); | |
1034 | } else { | |
1035 | elf_entry = loc->elf_ex.e_entry; | |
5342fba5 | 1036 | if (BAD_ADDR(elf_entry)) { |
ce51059b CE |
1037 | force_sig(SIGSEGV, current); |
1038 | retval = -EINVAL; | |
5342fba5 SS |
1039 | goto out_free_dentry; |
1040 | } | |
1da177e4 LT |
1041 | } |
1042 | ||
1043 | kfree(elf_phdata); | |
1044 | ||
1045 | if (interpreter_type != INTERPRETER_AOUT) | |
1046 | sys_close(elf_exec_fileno); | |
1047 | ||
1048 | set_binfmt(&elf_format); | |
1049 | ||
547ee84c BH |
1050 | #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES |
1051 | retval = arch_setup_additional_pages(bprm, executable_stack); | |
1052 | if (retval < 0) { | |
1053 | send_sig(SIGKILL, current, 0); | |
18c8baff | 1054 | goto out; |
547ee84c BH |
1055 | } |
1056 | #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */ | |
1057 | ||
1da177e4 LT |
1058 | compute_creds(bprm); |
1059 | current->flags &= ~PF_FORKNOEXEC; | |
b6a2fea3 | 1060 | retval = create_elf_tables(bprm, &loc->elf_ex, |
f4e5cc2c JJ |
1061 | (interpreter_type == INTERPRETER_AOUT), |
1062 | load_addr, interp_load_addr); | |
b6a2fea3 OW |
1063 | if (retval < 0) { |
1064 | send_sig(SIGKILL, current, 0); | |
1065 | goto out; | |
1066 | } | |
1da177e4 LT |
1067 | /* N.B. passed_fileno might not be initialized? */ |
1068 | if (interpreter_type == INTERPRETER_AOUT) | |
1069 | current->mm->arg_start += strlen(passed_fileno) + 1; | |
1070 | current->mm->end_code = end_code; | |
1071 | current->mm->start_code = start_code; | |
1072 | current->mm->start_data = start_data; | |
1073 | current->mm->end_data = end_data; | |
1074 | current->mm->start_stack = bprm->p; | |
1075 | ||
1076 | if (current->personality & MMAP_PAGE_ZERO) { | |
1077 | /* Why this, you ask??? Well SVr4 maps page 0 as read-only, | |
1078 | and some applications "depend" upon this behavior. | |
1079 | Since we do not have the power to recompile these, we | |
f4e5cc2c | 1080 | emulate the SVr4 behavior. Sigh. */ |
1da177e4 LT |
1081 | down_write(¤t->mm->mmap_sem); |
1082 | error = do_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC, | |
1083 | MAP_FIXED | MAP_PRIVATE, 0); | |
1084 | up_write(¤t->mm->mmap_sem); | |
1085 | } | |
1086 | ||
1087 | #ifdef ELF_PLAT_INIT | |
1088 | /* | |
1089 | * The ABI may specify that certain registers be set up in special | |
1090 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
1091 | * example. In addition, it may also specify (eg, PowerPC64 ELF) | |
1092 | * that the e_entry field is the address of the function descriptor | |
1093 | * for the startup routine, rather than the address of the startup | |
1094 | * routine itself. This macro performs whatever initialization to | |
1095 | * the regs structure is required as well as any relocations to the | |
1096 | * function descriptor entries when executing dynamically links apps. | |
1097 | */ | |
1098 | ELF_PLAT_INIT(regs, reloc_func_desc); | |
1099 | #endif | |
1100 | ||
1101 | start_thread(regs, elf_entry, bprm->p); | |
1102 | if (unlikely(current->ptrace & PT_PTRACED)) { | |
1103 | if (current->ptrace & PT_TRACE_EXEC) | |
1104 | ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP); | |
1105 | else | |
1106 | send_sig(SIGTRAP, current, 0); | |
1107 | } | |
1108 | retval = 0; | |
1109 | out: | |
1110 | kfree(loc); | |
1111 | out_ret: | |
1112 | return retval; | |
1113 | ||
1114 | /* error cleanup */ | |
1115 | out_free_dentry: | |
1116 | allow_write_access(interpreter); | |
1117 | if (interpreter) | |
1118 | fput(interpreter); | |
1119 | out_free_interp: | |
f99d49ad | 1120 | kfree(elf_interpreter); |
1da177e4 LT |
1121 | out_free_file: |
1122 | sys_close(elf_exec_fileno); | |
1123 | out_free_fh: | |
3b9b8ab6 KK |
1124 | if (files) |
1125 | reset_files_struct(current, files); | |
1da177e4 LT |
1126 | out_free_ph: |
1127 | kfree(elf_phdata); | |
1128 | goto out; | |
1129 | } | |
1130 | ||
1131 | /* This is really simpleminded and specialized - we are loading an | |
1132 | a.out library that is given an ELF header. */ | |
1da177e4 LT |
1133 | static int load_elf_library(struct file *file) |
1134 | { | |
1135 | struct elf_phdr *elf_phdata; | |
1136 | struct elf_phdr *eppnt; | |
1137 | unsigned long elf_bss, bss, len; | |
1138 | int retval, error, i, j; | |
1139 | struct elfhdr elf_ex; | |
1140 | ||
1141 | error = -ENOEXEC; | |
f4e5cc2c | 1142 | retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex)); |
1da177e4 LT |
1143 | if (retval != sizeof(elf_ex)) |
1144 | goto out; | |
1145 | ||
1146 | if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0) | |
1147 | goto out; | |
1148 | ||
1149 | /* First of all, some simple consistency checks */ | |
1150 | if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 || | |
f4e5cc2c | 1151 | !elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap) |
1da177e4 LT |
1152 | goto out; |
1153 | ||
1154 | /* Now read in all of the header information */ | |
1155 | ||
1156 | j = sizeof(struct elf_phdr) * elf_ex.e_phnum; | |
1157 | /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */ | |
1158 | ||
1159 | error = -ENOMEM; | |
1160 | elf_phdata = kmalloc(j, GFP_KERNEL); | |
1161 | if (!elf_phdata) | |
1162 | goto out; | |
1163 | ||
1164 | eppnt = elf_phdata; | |
1165 | error = -ENOEXEC; | |
1166 | retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j); | |
1167 | if (retval != j) | |
1168 | goto out_free_ph; | |
1169 | ||
1170 | for (j = 0, i = 0; i<elf_ex.e_phnum; i++) | |
1171 | if ((eppnt + i)->p_type == PT_LOAD) | |
1172 | j++; | |
1173 | if (j != 1) | |
1174 | goto out_free_ph; | |
1175 | ||
1176 | while (eppnt->p_type != PT_LOAD) | |
1177 | eppnt++; | |
1178 | ||
1179 | /* Now use mmap to map the library into memory. */ | |
1180 | down_write(¤t->mm->mmap_sem); | |
1181 | error = do_mmap(file, | |
1182 | ELF_PAGESTART(eppnt->p_vaddr), | |
1183 | (eppnt->p_filesz + | |
1184 | ELF_PAGEOFFSET(eppnt->p_vaddr)), | |
1185 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
1186 | MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE, | |
1187 | (eppnt->p_offset - | |
1188 | ELF_PAGEOFFSET(eppnt->p_vaddr))); | |
1189 | up_write(¤t->mm->mmap_sem); | |
1190 | if (error != ELF_PAGESTART(eppnt->p_vaddr)) | |
1191 | goto out_free_ph; | |
1192 | ||
1193 | elf_bss = eppnt->p_vaddr + eppnt->p_filesz; | |
1194 | if (padzero(elf_bss)) { | |
1195 | error = -EFAULT; | |
1196 | goto out_free_ph; | |
1197 | } | |
1198 | ||
f4e5cc2c JJ |
1199 | len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr + |
1200 | ELF_MIN_ALIGN - 1); | |
1da177e4 LT |
1201 | bss = eppnt->p_memsz + eppnt->p_vaddr; |
1202 | if (bss > len) { | |
1203 | down_write(¤t->mm->mmap_sem); | |
1204 | do_brk(len, bss - len); | |
1205 | up_write(¤t->mm->mmap_sem); | |
1206 | } | |
1207 | error = 0; | |
1208 | ||
1209 | out_free_ph: | |
1210 | kfree(elf_phdata); | |
1211 | out: | |
1212 | return error; | |
1213 | } | |
1214 | ||
1215 | /* | |
1216 | * Note that some platforms still use traditional core dumps and not | |
1217 | * the ELF core dump. Each platform can select it as appropriate. | |
1218 | */ | |
708e9a79 | 1219 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
1da177e4 LT |
1220 | |
1221 | /* | |
1222 | * ELF core dumper | |
1223 | * | |
1224 | * Modelled on fs/exec.c:aout_core_dump() | |
1225 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1226 | */ | |
1227 | /* | |
1228 | * These are the only things you should do on a core-file: use only these | |
1229 | * functions to write out all the necessary info. | |
1230 | */ | |
1231 | static int dump_write(struct file *file, const void *addr, int nr) | |
1232 | { | |
1233 | return file->f_op->write(file, addr, nr, &file->f_pos) == nr; | |
1234 | } | |
1235 | ||
5db92850 | 1236 | static int dump_seek(struct file *file, loff_t off) |
1da177e4 | 1237 | { |
d025c9db | 1238 | if (file->f_op->llseek && file->f_op->llseek != no_llseek) { |
7f14daa1 | 1239 | if (file->f_op->llseek(file, off, SEEK_CUR) < 0) |
1da177e4 | 1240 | return 0; |
d025c9db AK |
1241 | } else { |
1242 | char *buf = (char *)get_zeroed_page(GFP_KERNEL); | |
1243 | if (!buf) | |
1244 | return 0; | |
1245 | while (off > 0) { | |
1246 | unsigned long n = off; | |
1247 | if (n > PAGE_SIZE) | |
1248 | n = PAGE_SIZE; | |
1249 | if (!dump_write(file, buf, n)) | |
1250 | return 0; | |
1251 | off -= n; | |
1252 | } | |
1253 | free_page((unsigned long)buf); | |
1254 | } | |
1da177e4 LT |
1255 | return 1; |
1256 | } | |
1257 | ||
1258 | /* | |
1259 | * Decide whether a segment is worth dumping; default is yes to be | |
1260 | * sure (missing info is worse than too much; etc). | |
1261 | * Personally I'd include everything, and use the coredump limit... | |
1262 | * | |
1263 | * I think we should skip something. But I am not sure how. H.J. | |
1264 | */ | |
1265 | static int maydump(struct vm_area_struct *vma) | |
1266 | { | |
e5b97dde RM |
1267 | /* The vma can be set up to tell us the answer directly. */ |
1268 | if (vma->vm_flags & VM_ALWAYSDUMP) | |
1269 | return 1; | |
1270 | ||
1da177e4 LT |
1271 | /* Do not dump I/O mapped devices or special mappings */ |
1272 | if (vma->vm_flags & (VM_IO | VM_RESERVED)) | |
1273 | return 0; | |
1274 | ||
f4e5cc2c | 1275 | /* Dump shared memory only if mapped from an anonymous file. */ |
1da177e4 | 1276 | if (vma->vm_flags & VM_SHARED) |
0f7fc9e4 | 1277 | return vma->vm_file->f_path.dentry->d_inode->i_nlink == 0; |
1da177e4 LT |
1278 | |
1279 | /* If it hasn't been written to, don't write it out */ | |
1280 | if (!vma->anon_vma) | |
1281 | return 0; | |
1282 | ||
1283 | return 1; | |
1284 | } | |
1285 | ||
1da177e4 LT |
1286 | /* An ELF note in memory */ |
1287 | struct memelfnote | |
1288 | { | |
1289 | const char *name; | |
1290 | int type; | |
1291 | unsigned int datasz; | |
1292 | void *data; | |
1293 | }; | |
1294 | ||
1295 | static int notesize(struct memelfnote *en) | |
1296 | { | |
1297 | int sz; | |
1298 | ||
1299 | sz = sizeof(struct elf_note); | |
1300 | sz += roundup(strlen(en->name) + 1, 4); | |
1301 | sz += roundup(en->datasz, 4); | |
1302 | ||
1303 | return sz; | |
1304 | } | |
1305 | ||
d025c9db AK |
1306 | #define DUMP_WRITE(addr, nr, foffset) \ |
1307 | do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0) | |
1da177e4 | 1308 | |
d025c9db | 1309 | static int alignfile(struct file *file, loff_t *foffset) |
1da177e4 | 1310 | { |
a7a0d86f | 1311 | static const char buf[4] = { 0, }; |
d025c9db AK |
1312 | DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset); |
1313 | return 1; | |
1314 | } | |
1da177e4 | 1315 | |
d025c9db AK |
1316 | static int writenote(struct memelfnote *men, struct file *file, |
1317 | loff_t *foffset) | |
1318 | { | |
1319 | struct elf_note en; | |
1da177e4 LT |
1320 | en.n_namesz = strlen(men->name) + 1; |
1321 | en.n_descsz = men->datasz; | |
1322 | en.n_type = men->type; | |
1323 | ||
d025c9db AK |
1324 | DUMP_WRITE(&en, sizeof(en), foffset); |
1325 | DUMP_WRITE(men->name, en.n_namesz, foffset); | |
1326 | if (!alignfile(file, foffset)) | |
1327 | return 0; | |
1328 | DUMP_WRITE(men->data, men->datasz, foffset); | |
1329 | if (!alignfile(file, foffset)) | |
1330 | return 0; | |
1da177e4 LT |
1331 | |
1332 | return 1; | |
1333 | } | |
1334 | #undef DUMP_WRITE | |
1da177e4 LT |
1335 | |
1336 | #define DUMP_WRITE(addr, nr) \ | |
1337 | if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \ | |
1338 | goto end_coredump; | |
1339 | #define DUMP_SEEK(off) \ | |
1340 | if (!dump_seek(file, (off))) \ | |
1341 | goto end_coredump; | |
1342 | ||
858119e1 | 1343 | static void fill_elf_header(struct elfhdr *elf, int segs) |
1da177e4 LT |
1344 | { |
1345 | memcpy(elf->e_ident, ELFMAG, SELFMAG); | |
1346 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1347 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1348 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1349 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1350 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); | |
1351 | ||
1352 | elf->e_type = ET_CORE; | |
1353 | elf->e_machine = ELF_ARCH; | |
1354 | elf->e_version = EV_CURRENT; | |
1355 | elf->e_entry = 0; | |
1356 | elf->e_phoff = sizeof(struct elfhdr); | |
1357 | elf->e_shoff = 0; | |
1358 | elf->e_flags = ELF_CORE_EFLAGS; | |
1359 | elf->e_ehsize = sizeof(struct elfhdr); | |
1360 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1361 | elf->e_phnum = segs; | |
1362 | elf->e_shentsize = 0; | |
1363 | elf->e_shnum = 0; | |
1364 | elf->e_shstrndx = 0; | |
1365 | return; | |
1366 | } | |
1367 | ||
8d6b5eee | 1368 | static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1da177e4 LT |
1369 | { |
1370 | phdr->p_type = PT_NOTE; | |
1371 | phdr->p_offset = offset; | |
1372 | phdr->p_vaddr = 0; | |
1373 | phdr->p_paddr = 0; | |
1374 | phdr->p_filesz = sz; | |
1375 | phdr->p_memsz = 0; | |
1376 | phdr->p_flags = 0; | |
1377 | phdr->p_align = 0; | |
1378 | return; | |
1379 | } | |
1380 | ||
1381 | static void fill_note(struct memelfnote *note, const char *name, int type, | |
1382 | unsigned int sz, void *data) | |
1383 | { | |
1384 | note->name = name; | |
1385 | note->type = type; | |
1386 | note->datasz = sz; | |
1387 | note->data = data; | |
1388 | return; | |
1389 | } | |
1390 | ||
1391 | /* | |
f4e5cc2c JJ |
1392 | * fill up all the fields in prstatus from the given task struct, except |
1393 | * registers which need to be filled up separately. | |
1da177e4 LT |
1394 | */ |
1395 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
f4e5cc2c | 1396 | struct task_struct *p, long signr) |
1da177e4 LT |
1397 | { |
1398 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1399 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1400 | prstatus->pr_sighold = p->blocked.sig[0]; | |
1401 | prstatus->pr_pid = p->pid; | |
1402 | prstatus->pr_ppid = p->parent->pid; | |
1403 | prstatus->pr_pgrp = process_group(p); | |
937949d9 | 1404 | prstatus->pr_sid = process_session(p); |
1da177e4 LT |
1405 | if (thread_group_leader(p)) { |
1406 | /* | |
1407 | * This is the record for the group leader. Add in the | |
1408 | * cumulative times of previous dead threads. This total | |
1409 | * won't include the time of each live thread whose state | |
1410 | * is included in the core dump. The final total reported | |
1411 | * to our parent process when it calls wait4 will include | |
1412 | * those sums as well as the little bit more time it takes | |
1413 | * this and each other thread to finish dying after the | |
1414 | * core dump synchronization phase. | |
1415 | */ | |
1416 | cputime_to_timeval(cputime_add(p->utime, p->signal->utime), | |
1417 | &prstatus->pr_utime); | |
1418 | cputime_to_timeval(cputime_add(p->stime, p->signal->stime), | |
1419 | &prstatus->pr_stime); | |
1420 | } else { | |
1421 | cputime_to_timeval(p->utime, &prstatus->pr_utime); | |
1422 | cputime_to_timeval(p->stime, &prstatus->pr_stime); | |
1423 | } | |
1424 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); | |
1425 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); | |
1426 | } | |
1427 | ||
1428 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1429 | struct mm_struct *mm) | |
1430 | { | |
a84a5059 | 1431 | unsigned int i, len; |
1da177e4 LT |
1432 | |
1433 | /* first copy the parameters from user space */ | |
1434 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1435 | ||
1436 | len = mm->arg_end - mm->arg_start; | |
1437 | if (len >= ELF_PRARGSZ) | |
1438 | len = ELF_PRARGSZ-1; | |
1439 | if (copy_from_user(&psinfo->pr_psargs, | |
1440 | (const char __user *)mm->arg_start, len)) | |
1441 | return -EFAULT; | |
1442 | for(i = 0; i < len; i++) | |
1443 | if (psinfo->pr_psargs[i] == 0) | |
1444 | psinfo->pr_psargs[i] = ' '; | |
1445 | psinfo->pr_psargs[len] = 0; | |
1446 | ||
1447 | psinfo->pr_pid = p->pid; | |
1448 | psinfo->pr_ppid = p->parent->pid; | |
1449 | psinfo->pr_pgrp = process_group(p); | |
937949d9 | 1450 | psinfo->pr_sid = process_session(p); |
1da177e4 LT |
1451 | |
1452 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1453 | psinfo->pr_state = i; | |
55148548 | 1454 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1da177e4 LT |
1455 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
1456 | psinfo->pr_nice = task_nice(p); | |
1457 | psinfo->pr_flag = p->flags; | |
1458 | SET_UID(psinfo->pr_uid, p->uid); | |
1459 | SET_GID(psinfo->pr_gid, p->gid); | |
1460 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); | |
1461 | ||
1462 | return 0; | |
1463 | } | |
1464 | ||
1465 | /* Here is the structure in which status of each thread is captured. */ | |
1466 | struct elf_thread_status | |
1467 | { | |
1468 | struct list_head list; | |
1469 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1470 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1471 | struct task_struct *thread; | |
1472 | #ifdef ELF_CORE_COPY_XFPREGS | |
1473 | elf_fpxregset_t xfpu; /* NT_PRXFPREG */ | |
1474 | #endif | |
1475 | struct memelfnote notes[3]; | |
1476 | int num_notes; | |
1477 | }; | |
1478 | ||
1479 | /* | |
1480 | * In order to add the specific thread information for the elf file format, | |
f4e5cc2c JJ |
1481 | * we need to keep a linked list of every threads pr_status and then create |
1482 | * a single section for them in the final core file. | |
1da177e4 LT |
1483 | */ |
1484 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1485 | { | |
1486 | int sz = 0; | |
1487 | struct task_struct *p = t->thread; | |
1488 | t->num_notes = 0; | |
1489 | ||
1490 | fill_prstatus(&t->prstatus, p, signr); | |
1491 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1492 | ||
f4e5cc2c JJ |
1493 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
1494 | &(t->prstatus)); | |
1da177e4 LT |
1495 | t->num_notes++; |
1496 | sz += notesize(&t->notes[0]); | |
1497 | ||
f4e5cc2c JJ |
1498 | if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, |
1499 | &t->fpu))) { | |
1500 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1501 | &(t->fpu)); | |
1da177e4 LT |
1502 | t->num_notes++; |
1503 | sz += notesize(&t->notes[1]); | |
1504 | } | |
1505 | ||
1506 | #ifdef ELF_CORE_COPY_XFPREGS | |
1507 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
f4e5cc2c JJ |
1508 | fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu), |
1509 | &t->xfpu); | |
1da177e4 LT |
1510 | t->num_notes++; |
1511 | sz += notesize(&t->notes[2]); | |
1512 | } | |
1513 | #endif | |
1514 | return sz; | |
1515 | } | |
1516 | ||
f47aef55 RM |
1517 | static struct vm_area_struct *first_vma(struct task_struct *tsk, |
1518 | struct vm_area_struct *gate_vma) | |
1519 | { | |
1520 | struct vm_area_struct *ret = tsk->mm->mmap; | |
1521 | ||
1522 | if (ret) | |
1523 | return ret; | |
1524 | return gate_vma; | |
1525 | } | |
1526 | /* | |
1527 | * Helper function for iterating across a vma list. It ensures that the caller | |
1528 | * will visit `gate_vma' prior to terminating the search. | |
1529 | */ | |
1530 | static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma, | |
1531 | struct vm_area_struct *gate_vma) | |
1532 | { | |
1533 | struct vm_area_struct *ret; | |
1534 | ||
1535 | ret = this_vma->vm_next; | |
1536 | if (ret) | |
1537 | return ret; | |
1538 | if (this_vma == gate_vma) | |
1539 | return NULL; | |
1540 | return gate_vma; | |
1541 | } | |
1542 | ||
1da177e4 LT |
1543 | /* |
1544 | * Actual dumper | |
1545 | * | |
1546 | * This is a two-pass process; first we find the offsets of the bits, | |
1547 | * and then they are actually written out. If we run out of core limit | |
1548 | * we just truncate. | |
1549 | */ | |
f4e5cc2c | 1550 | static int elf_core_dump(long signr, struct pt_regs *regs, struct file *file) |
1da177e4 LT |
1551 | { |
1552 | #define NUM_NOTES 6 | |
1553 | int has_dumped = 0; | |
1554 | mm_segment_t fs; | |
1555 | int segs; | |
1556 | size_t size = 0; | |
1557 | int i; | |
f47aef55 | 1558 | struct vm_area_struct *vma, *gate_vma; |
1da177e4 | 1559 | struct elfhdr *elf = NULL; |
d025c9db | 1560 | loff_t offset = 0, dataoff, foffset; |
1da177e4 LT |
1561 | unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur; |
1562 | int numnote; | |
1563 | struct memelfnote *notes = NULL; | |
1564 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ | |
1565 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ | |
1566 | struct task_struct *g, *p; | |
1567 | LIST_HEAD(thread_list); | |
1568 | struct list_head *t; | |
1569 | elf_fpregset_t *fpu = NULL; | |
1570 | #ifdef ELF_CORE_COPY_XFPREGS | |
1571 | elf_fpxregset_t *xfpu = NULL; | |
1572 | #endif | |
1573 | int thread_status_size = 0; | |
1574 | elf_addr_t *auxv; | |
ef7320ed ME |
1575 | #ifdef ELF_CORE_WRITE_EXTRA_NOTES |
1576 | int extra_notes_size; | |
1577 | #endif | |
1da177e4 LT |
1578 | |
1579 | /* | |
1580 | * We no longer stop all VM operations. | |
1581 | * | |
f4e5cc2c JJ |
1582 | * This is because those proceses that could possibly change map_count |
1583 | * or the mmap / vma pages are now blocked in do_exit on current | |
1584 | * finishing this core dump. | |
1da177e4 LT |
1585 | * |
1586 | * Only ptrace can touch these memory addresses, but it doesn't change | |
f4e5cc2c | 1587 | * the map_count or the pages allocated. So no possibility of crashing |
1da177e4 LT |
1588 | * exists while dumping the mm->vm_next areas to the core file. |
1589 | */ | |
1590 | ||
1591 | /* alloc memory for large data structures: too large to be on stack */ | |
1592 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
1593 | if (!elf) | |
1594 | goto cleanup; | |
1595 | prstatus = kmalloc(sizeof(*prstatus), GFP_KERNEL); | |
1596 | if (!prstatus) | |
1597 | goto cleanup; | |
1598 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
1599 | if (!psinfo) | |
1600 | goto cleanup; | |
1601 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); | |
1602 | if (!notes) | |
1603 | goto cleanup; | |
1604 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); | |
1605 | if (!fpu) | |
1606 | goto cleanup; | |
1607 | #ifdef ELF_CORE_COPY_XFPREGS | |
1608 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); | |
1609 | if (!xfpu) | |
1610 | goto cleanup; | |
1611 | #endif | |
1612 | ||
1613 | if (signr) { | |
1614 | struct elf_thread_status *tmp; | |
486ccb05 | 1615 | rcu_read_lock(); |
1da177e4 LT |
1616 | do_each_thread(g,p) |
1617 | if (current->mm == p->mm && current != p) { | |
11b0b5ab | 1618 | tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC); |
1da177e4 | 1619 | if (!tmp) { |
486ccb05 | 1620 | rcu_read_unlock(); |
1da177e4 LT |
1621 | goto cleanup; |
1622 | } | |
1da177e4 LT |
1623 | tmp->thread = p; |
1624 | list_add(&tmp->list, &thread_list); | |
1625 | } | |
1626 | while_each_thread(g,p); | |
486ccb05 | 1627 | rcu_read_unlock(); |
1da177e4 LT |
1628 | list_for_each(t, &thread_list) { |
1629 | struct elf_thread_status *tmp; | |
1630 | int sz; | |
1631 | ||
1632 | tmp = list_entry(t, struct elf_thread_status, list); | |
1633 | sz = elf_dump_thread_status(signr, tmp); | |
1634 | thread_status_size += sz; | |
1635 | } | |
1636 | } | |
1637 | /* now collect the dump for the current */ | |
1638 | memset(prstatus, 0, sizeof(*prstatus)); | |
1639 | fill_prstatus(prstatus, current, signr); | |
1640 | elf_core_copy_regs(&prstatus->pr_reg, regs); | |
1641 | ||
1642 | segs = current->mm->map_count; | |
1643 | #ifdef ELF_CORE_EXTRA_PHDRS | |
1644 | segs += ELF_CORE_EXTRA_PHDRS; | |
1645 | #endif | |
1646 | ||
f47aef55 RM |
1647 | gate_vma = get_gate_vma(current); |
1648 | if (gate_vma != NULL) | |
1649 | segs++; | |
1650 | ||
1da177e4 | 1651 | /* Set up header */ |
f4e5cc2c | 1652 | fill_elf_header(elf, segs + 1); /* including notes section */ |
1da177e4 LT |
1653 | |
1654 | has_dumped = 1; | |
1655 | current->flags |= PF_DUMPCORE; | |
1656 | ||
1657 | /* | |
1658 | * Set up the notes in similar form to SVR4 core dumps made | |
1659 | * with info from their /proc. | |
1660 | */ | |
1661 | ||
f4e5cc2c | 1662 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); |
1da177e4 | 1663 | fill_psinfo(psinfo, current->group_leader, current->mm); |
f4e5cc2c | 1664 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
1da177e4 | 1665 | |
a9289728 | 1666 | numnote = 2; |
1da177e4 | 1667 | |
f4e5cc2c | 1668 | auxv = (elf_addr_t *)current->mm->saved_auxv; |
1da177e4 LT |
1669 | |
1670 | i = 0; | |
1671 | do | |
1672 | i += 2; | |
1673 | while (auxv[i - 2] != AT_NULL); | |
1674 | fill_note(¬es[numnote++], "CORE", NT_AUXV, | |
f4e5cc2c | 1675 | i * sizeof(elf_addr_t), auxv); |
1da177e4 LT |
1676 | |
1677 | /* Try to dump the FPU. */ | |
f4e5cc2c JJ |
1678 | if ((prstatus->pr_fpvalid = |
1679 | elf_core_copy_task_fpregs(current, regs, fpu))) | |
1da177e4 LT |
1680 | fill_note(notes + numnote++, |
1681 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); | |
1682 | #ifdef ELF_CORE_COPY_XFPREGS | |
1683 | if (elf_core_copy_task_xfpregs(current, xfpu)) | |
1684 | fill_note(notes + numnote++, | |
1685 | "LINUX", NT_PRXFPREG, sizeof(*xfpu), xfpu); | |
1686 | #endif | |
1687 | ||
1688 | fs = get_fs(); | |
1689 | set_fs(KERNEL_DS); | |
1690 | ||
1691 | DUMP_WRITE(elf, sizeof(*elf)); | |
1692 | offset += sizeof(*elf); /* Elf header */ | |
a7a0d86f PV |
1693 | offset += (segs + 1) * sizeof(struct elf_phdr); /* Program headers */ |
1694 | foffset = offset; | |
1da177e4 LT |
1695 | |
1696 | /* Write notes phdr entry */ | |
1697 | { | |
1698 | struct elf_phdr phdr; | |
1699 | int sz = 0; | |
1700 | ||
1701 | for (i = 0; i < numnote; i++) | |
1702 | sz += notesize(notes + i); | |
1703 | ||
1704 | sz += thread_status_size; | |
1705 | ||
bf1ab978 | 1706 | #ifdef ELF_CORE_WRITE_EXTRA_NOTES |
ef7320ed ME |
1707 | extra_notes_size = ELF_CORE_EXTRA_NOTES_SIZE; |
1708 | sz += extra_notes_size; | |
bf1ab978 DGM |
1709 | #endif |
1710 | ||
1da177e4 LT |
1711 | fill_elf_note_phdr(&phdr, sz, offset); |
1712 | offset += sz; | |
1713 | DUMP_WRITE(&phdr, sizeof(phdr)); | |
1714 | } | |
1715 | ||
1da177e4 LT |
1716 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
1717 | ||
1718 | /* Write program headers for segments dump */ | |
f47aef55 RM |
1719 | for (vma = first_vma(current, gate_vma); vma != NULL; |
1720 | vma = next_vma(vma, gate_vma)) { | |
1da177e4 LT |
1721 | struct elf_phdr phdr; |
1722 | size_t sz; | |
1723 | ||
1724 | sz = vma->vm_end - vma->vm_start; | |
1725 | ||
1726 | phdr.p_type = PT_LOAD; | |
1727 | phdr.p_offset = offset; | |
1728 | phdr.p_vaddr = vma->vm_start; | |
1729 | phdr.p_paddr = 0; | |
1730 | phdr.p_filesz = maydump(vma) ? sz : 0; | |
1731 | phdr.p_memsz = sz; | |
1732 | offset += phdr.p_filesz; | |
1733 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
f4e5cc2c JJ |
1734 | if (vma->vm_flags & VM_WRITE) |
1735 | phdr.p_flags |= PF_W; | |
1736 | if (vma->vm_flags & VM_EXEC) | |
1737 | phdr.p_flags |= PF_X; | |
1da177e4 LT |
1738 | phdr.p_align = ELF_EXEC_PAGESIZE; |
1739 | ||
1740 | DUMP_WRITE(&phdr, sizeof(phdr)); | |
1741 | } | |
1742 | ||
1743 | #ifdef ELF_CORE_WRITE_EXTRA_PHDRS | |
1744 | ELF_CORE_WRITE_EXTRA_PHDRS; | |
1745 | #endif | |
1746 | ||
1747 | /* write out the notes section */ | |
1748 | for (i = 0; i < numnote; i++) | |
d025c9db | 1749 | if (!writenote(notes + i, file, &foffset)) |
1da177e4 LT |
1750 | goto end_coredump; |
1751 | ||
bf1ab978 DGM |
1752 | #ifdef ELF_CORE_WRITE_EXTRA_NOTES |
1753 | ELF_CORE_WRITE_EXTRA_NOTES; | |
ef7320ed | 1754 | foffset += extra_notes_size; |
bf1ab978 DGM |
1755 | #endif |
1756 | ||
1da177e4 LT |
1757 | /* write out the thread status notes section */ |
1758 | list_for_each(t, &thread_list) { | |
f4e5cc2c JJ |
1759 | struct elf_thread_status *tmp = |
1760 | list_entry(t, struct elf_thread_status, list); | |
1761 | ||
1da177e4 | 1762 | for (i = 0; i < tmp->num_notes; i++) |
d025c9db | 1763 | if (!writenote(&tmp->notes[i], file, &foffset)) |
1da177e4 LT |
1764 | goto end_coredump; |
1765 | } | |
d025c9db AK |
1766 | |
1767 | /* Align to page */ | |
1768 | DUMP_SEEK(dataoff - foffset); | |
1da177e4 | 1769 | |
f47aef55 RM |
1770 | for (vma = first_vma(current, gate_vma); vma != NULL; |
1771 | vma = next_vma(vma, gate_vma)) { | |
1da177e4 LT |
1772 | unsigned long addr; |
1773 | ||
1774 | if (!maydump(vma)) | |
1775 | continue; | |
1776 | ||
1777 | for (addr = vma->vm_start; | |
1778 | addr < vma->vm_end; | |
1779 | addr += PAGE_SIZE) { | |
f4e5cc2c | 1780 | struct page *page; |
1da177e4 LT |
1781 | struct vm_area_struct *vma; |
1782 | ||
1783 | if (get_user_pages(current, current->mm, addr, 1, 0, 1, | |
1784 | &page, &vma) <= 0) { | |
d025c9db | 1785 | DUMP_SEEK(PAGE_SIZE); |
1da177e4 LT |
1786 | } else { |
1787 | if (page == ZERO_PAGE(addr)) { | |
03221702 BP |
1788 | if (!dump_seek(file, PAGE_SIZE)) { |
1789 | page_cache_release(page); | |
1790 | goto end_coredump; | |
1791 | } | |
1da177e4 LT |
1792 | } else { |
1793 | void *kaddr; | |
f4e5cc2c JJ |
1794 | flush_cache_page(vma, addr, |
1795 | page_to_pfn(page)); | |
1da177e4 LT |
1796 | kaddr = kmap(page); |
1797 | if ((size += PAGE_SIZE) > limit || | |
1798 | !dump_write(file, kaddr, | |
1799 | PAGE_SIZE)) { | |
1800 | kunmap(page); | |
1801 | page_cache_release(page); | |
1802 | goto end_coredump; | |
1803 | } | |
1804 | kunmap(page); | |
1805 | } | |
1806 | page_cache_release(page); | |
1807 | } | |
1808 | } | |
1809 | } | |
1810 | ||
1811 | #ifdef ELF_CORE_WRITE_EXTRA_DATA | |
1812 | ELF_CORE_WRITE_EXTRA_DATA; | |
1813 | #endif | |
1814 | ||
1da177e4 LT |
1815 | end_coredump: |
1816 | set_fs(fs); | |
1817 | ||
1818 | cleanup: | |
74da6cd0 | 1819 | while (!list_empty(&thread_list)) { |
1da177e4 LT |
1820 | struct list_head *tmp = thread_list.next; |
1821 | list_del(tmp); | |
1822 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
1823 | } | |
1824 | ||
1825 | kfree(elf); | |
1826 | kfree(prstatus); | |
1827 | kfree(psinfo); | |
1828 | kfree(notes); | |
1829 | kfree(fpu); | |
1830 | #ifdef ELF_CORE_COPY_XFPREGS | |
1831 | kfree(xfpu); | |
1832 | #endif | |
1833 | return has_dumped; | |
1834 | #undef NUM_NOTES | |
1835 | } | |
1836 | ||
1837 | #endif /* USE_ELF_CORE_DUMP */ | |
1838 | ||
1839 | static int __init init_elf_binfmt(void) | |
1840 | { | |
1841 | return register_binfmt(&elf_format); | |
1842 | } | |
1843 | ||
1844 | static void __exit exit_elf_binfmt(void) | |
1845 | { | |
1846 | /* Remove the COFF and ELF loaders. */ | |
1847 | unregister_binfmt(&elf_format); | |
1848 | } | |
1849 | ||
1850 | core_initcall(init_elf_binfmt); | |
1851 | module_exit(exit_elf_binfmt); | |
1852 | MODULE_LICENSE("GPL"); |