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1 | /* binfmt_elf_fdpic.c: FDPIC ELF binary format |
2 | * |
3 | * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved. |
4 | * Written by David Howells (dhowells@redhat.com) |
5 | * Derived from binfmt_elf.c |
6 | * |
7 | * This program is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU General Public License |
9 | * as published by the Free Software Foundation; either version |
10 | * 2 of the License, or (at your option) any later version. |
11 | */ |
12 | |
13 | #include <linux/module.h> |
14 | |
15 | #include <linux/fs.h> |
16 | #include <linux/stat.h> |
17 | #include <linux/sched.h> |
18 | #include <linux/mm.h> |
19 | #include <linux/mman.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/slab.h> |
27 | #include <linux/pagemap.h> |
28 | #include <linux/security.h> |
29 | #include <linux/highmem.h> |
30 | #include <linux/highuid.h> |
31 | #include <linux/personality.h> |
32 | #include <linux/ptrace.h> |
33 | #include <linux/init.h> |
34 | #include <linux/elf.h> |
35 | #include <linux/elf-fdpic.h> |
36 | #include <linux/elfcore.h> |
37 | |
38 | #include <asm/uaccess.h> |
39 | #include <asm/param.h> |
40 | #include <asm/pgalloc.h> |
41 | |
42 | typedef char *elf_caddr_t; |
43 | |
44 | #if 0 |
45 | #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
46 | #else |
47 | #define kdebug(fmt, ...) do {} while(0) |
48 | #endif |
49 | |
50 | #if 0 |
51 | #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
52 | #else |
53 | #define kdcore(fmt, ...) do {} while(0) |
54 | #endif |
55 | |
56 | MODULE_LICENSE("GPL"); |
57 | |
58 | static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *); |
59 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); |
60 | static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, |
61 | struct mm_struct *, const char *); |
62 | |
63 | static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, |
64 | struct elf_fdpic_params *, |
65 | struct elf_fdpic_params *); |
66 | |
67 | #ifndef CONFIG_MMU |
68 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *, |
69 | unsigned long *); |
70 | static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *, |
71 | struct file *, |
72 | struct mm_struct *); |
73 | #endif |
74 | |
75 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, |
76 | struct file *, struct mm_struct *); |
77 | |
78 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
79 | static int elf_fdpic_core_dump(long, struct pt_regs *, struct file *, unsigned long limit); |
80 | #endif |
81 | |
82 | static struct linux_binfmt elf_fdpic_format = { |
83 | .module = THIS_MODULE, |
84 | .load_binary = load_elf_fdpic_binary, |
85 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
86 | .core_dump = elf_fdpic_core_dump, |
87 | #endif |
88 | .min_coredump = ELF_EXEC_PAGESIZE, |
89 | }; |
90 | |
91 | static int __init init_elf_fdpic_binfmt(void) |
92 | { |
93 | return register_binfmt(&elf_fdpic_format); |
94 | } |
95 | |
96 | static void __exit exit_elf_fdpic_binfmt(void) |
97 | { |
98 | unregister_binfmt(&elf_fdpic_format); |
99 | } |
100 | |
101 | core_initcall(init_elf_fdpic_binfmt); |
102 | module_exit(exit_elf_fdpic_binfmt); |
103 | |
104 | static int is_elf_fdpic(struct elfhdr *hdr, struct file *file) |
105 | { |
106 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) |
107 | return 0; |
108 | if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) |
109 | return 0; |
110 | if (!elf_check_arch(hdr) || !elf_check_fdpic(hdr)) |
111 | return 0; |
112 | if (!file->f_op || !file->f_op->mmap) |
113 | return 0; |
114 | return 1; |
115 | } |
116 | |
117 | /*****************************************************************************/ |
118 | /* |
119 | * read the program headers table into memory |
120 | */ |
121 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, |
122 | struct file *file) |
123 | { |
124 | struct elf32_phdr *phdr; |
125 | unsigned long size; |
126 | int retval, loop; |
127 | |
128 | if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) |
129 | return -ENOMEM; |
130 | if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) |
131 | return -ENOMEM; |
132 | |
133 | size = params->hdr.e_phnum * sizeof(struct elf_phdr); |
134 | params->phdrs = kmalloc(size, GFP_KERNEL); |
135 | if (!params->phdrs) |
136 | return -ENOMEM; |
137 | |
138 | retval = kernel_read(file, params->hdr.e_phoff, |
139 | (char *) params->phdrs, size); |
140 | if (unlikely(retval != size)) |
141 | return retval < 0 ? retval : -ENOEXEC; |
142 | |
143 | /* determine stack size for this binary */ |
144 | phdr = params->phdrs; |
145 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
146 | if (phdr->p_type != PT_GNU_STACK) |
147 | continue; |
148 | |
149 | if (phdr->p_flags & PF_X) |
150 | params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; |
151 | else |
152 | params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; |
153 | |
154 | params->stack_size = phdr->p_memsz; |
155 | break; |
156 | } |
157 | |
158 | return 0; |
159 | } |
160 | |
161 | /*****************************************************************************/ |
162 | /* |
163 | * load an fdpic binary into various bits of memory |
164 | */ |
165 | static int load_elf_fdpic_binary(struct linux_binprm *bprm, |
166 | struct pt_regs *regs) |
167 | { |
168 | struct elf_fdpic_params exec_params, interp_params; |
169 | struct elf_phdr *phdr; |
170 | unsigned long stack_size, entryaddr; |
171 | #ifdef ELF_FDPIC_PLAT_INIT |
172 | unsigned long dynaddr; |
173 | #endif |
174 | struct file *interpreter = NULL; /* to shut gcc up */ |
175 | char *interpreter_name = NULL; |
176 | int executable_stack; |
177 | int retval, i; |
178 | |
179 | kdebug("____ LOAD %d ____", current->pid); |
180 | |
181 | memset(&exec_params, 0, sizeof(exec_params)); |
182 | memset(&interp_params, 0, sizeof(interp_params)); |
183 | |
184 | exec_params.hdr = *(struct elfhdr *) bprm->buf; |
185 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; |
186 | |
187 | /* check that this is a binary we know how to deal with */ |
188 | retval = -ENOEXEC; |
189 | if (!is_elf_fdpic(&exec_params.hdr, bprm->file)) |
190 | goto error; |
191 | |
192 | /* read the program header table */ |
193 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); |
194 | if (retval < 0) |
195 | goto error; |
196 | |
197 | /* scan for a program header that specifies an interpreter */ |
198 | phdr = exec_params.phdrs; |
199 | |
200 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { |
201 | switch (phdr->p_type) { |
202 | case PT_INTERP: |
203 | retval = -ENOMEM; |
204 | if (phdr->p_filesz > PATH_MAX) |
205 | goto error; |
206 | retval = -ENOENT; |
207 | if (phdr->p_filesz < 2) |
208 | goto error; |
209 | |
210 | /* read the name of the interpreter into memory */ |
211 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
212 | if (!interpreter_name) |
213 | goto error; |
214 | |
215 | retval = kernel_read(bprm->file, |
216 | phdr->p_offset, |
217 | interpreter_name, |
218 | phdr->p_filesz); |
219 | if (unlikely(retval != phdr->p_filesz)) { |
220 | if (retval >= 0) |
221 | retval = -ENOEXEC; |
222 | goto error; |
223 | } |
224 | |
225 | retval = -ENOENT; |
226 | if (interpreter_name[phdr->p_filesz - 1] != '\0') |
227 | goto error; |
228 | |
229 | kdebug("Using ELF interpreter %s", interpreter_name); |
230 | |
231 | /* replace the program with the interpreter */ |
232 | interpreter = open_exec(interpreter_name); |
233 | retval = PTR_ERR(interpreter); |
234 | if (IS_ERR(interpreter)) { |
235 | interpreter = NULL; |
236 | goto error; |
237 | } |
238 | |
239 | /* |
240 | * If the binary is not readable then enforce |
241 | * mm->dumpable = 0 regardless of the interpreter's |
242 | * permissions. |
243 | */ |
244 | if (file_permission(interpreter, MAY_READ) < 0) |
245 | bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; |
246 | |
247 | retval = kernel_read(interpreter, 0, bprm->buf, |
248 | BINPRM_BUF_SIZE); |
249 | if (unlikely(retval != BINPRM_BUF_SIZE)) { |
250 | if (retval >= 0) |
251 | retval = -ENOEXEC; |
252 | goto error; |
253 | } |
254 | |
255 | interp_params.hdr = *((struct elfhdr *) bprm->buf); |
256 | break; |
257 | |
258 | case PT_LOAD: |
259 | #ifdef CONFIG_MMU |
260 | if (exec_params.load_addr == 0) |
261 | exec_params.load_addr = phdr->p_vaddr; |
262 | #endif |
263 | break; |
264 | } |
265 | |
266 | } |
267 | |
268 | if (elf_check_const_displacement(&exec_params.hdr)) |
269 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
270 | |
271 | /* perform insanity checks on the interpreter */ |
272 | if (interpreter_name) { |
273 | retval = -ELIBBAD; |
274 | if (!is_elf_fdpic(&interp_params.hdr, interpreter)) |
275 | goto error; |
276 | |
277 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT; |
278 | |
279 | /* read the interpreter's program header table */ |
280 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); |
281 | if (retval < 0) |
282 | goto error; |
283 | } |
284 | |
285 | stack_size = exec_params.stack_size; |
286 | if (stack_size < interp_params.stack_size) |
287 | stack_size = interp_params.stack_size; |
288 | |
289 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
290 | executable_stack = EXSTACK_ENABLE_X; |
291 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
292 | executable_stack = EXSTACK_DISABLE_X; |
293 | else if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
294 | executable_stack = EXSTACK_ENABLE_X; |
295 | else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
296 | executable_stack = EXSTACK_DISABLE_X; |
297 | else |
298 | executable_stack = EXSTACK_DEFAULT; |
299 | |
300 | retval = -ENOEXEC; |
301 | if (stack_size == 0) |
302 | goto error; |
303 | |
304 | if (elf_check_const_displacement(&interp_params.hdr)) |
305 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
306 | |
307 | /* flush all traces of the currently running executable */ |
308 | retval = flush_old_exec(bprm); |
309 | if (retval) |
310 | goto error; |
311 | |
312 | /* there's now no turning back... the old userspace image is dead, |
313 | * defunct, deceased, etc. after this point we have to exit via |
314 | * error_kill */ |
315 | set_personality(PER_LINUX_FDPIC); |
316 | set_binfmt(&elf_fdpic_format); |
317 | |
318 | current->mm->start_code = 0; |
319 | current->mm->end_code = 0; |
320 | current->mm->start_stack = 0; |
321 | current->mm->start_data = 0; |
322 | current->mm->end_data = 0; |
323 | current->mm->context.exec_fdpic_loadmap = 0; |
324 | current->mm->context.interp_fdpic_loadmap = 0; |
325 | |
326 | current->flags &= ~PF_FORKNOEXEC; |
327 | |
328 | #ifdef CONFIG_MMU |
329 | elf_fdpic_arch_lay_out_mm(&exec_params, |
330 | &interp_params, |
331 | ¤t->mm->start_stack, |
332 | ¤t->mm->start_brk); |
333 | |
334 | retval = setup_arg_pages(bprm, current->mm->start_stack, |
335 | executable_stack); |
336 | if (retval < 0) { |
337 | send_sig(SIGKILL, current, 0); |
338 | goto error_kill; |
339 | } |
340 | #endif |
341 | |
342 | /* load the executable and interpreter into memory */ |
343 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
344 | "executable"); |
345 | if (retval < 0) |
346 | goto error_kill; |
347 | |
348 | if (interpreter_name) { |
349 | retval = elf_fdpic_map_file(&interp_params, interpreter, |
350 | current->mm, "interpreter"); |
351 | if (retval < 0) { |
352 | printk(KERN_ERR "Unable to load interpreter\n"); |
353 | goto error_kill; |
354 | } |
355 | |
356 | allow_write_access(interpreter); |
357 | fput(interpreter); |
358 | interpreter = NULL; |
359 | } |
360 | |
361 | #ifdef CONFIG_MMU |
362 | if (!current->mm->start_brk) |
363 | current->mm->start_brk = current->mm->end_data; |
364 | |
365 | current->mm->brk = current->mm->start_brk = |
366 | PAGE_ALIGN(current->mm->start_brk); |
367 | |
368 | #else |
369 | /* create a stack and brk area big enough for everyone |
370 | * - the brk heap starts at the bottom and works up |
371 | * - the stack starts at the top and works down |
372 | */ |
373 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; |
374 | if (stack_size < PAGE_SIZE * 2) |
375 | stack_size = PAGE_SIZE * 2; |
376 | |
377 | down_write(¤t->mm->mmap_sem); |
378 | current->mm->start_brk = do_mmap(NULL, 0, stack_size, |
379 | PROT_READ | PROT_WRITE | PROT_EXEC, |
380 | MAP_PRIVATE | MAP_ANONYMOUS | MAP_GROWSDOWN, |
381 | 0); |
382 | |
383 | if (IS_ERR_VALUE(current->mm->start_brk)) { |
384 | up_write(¤t->mm->mmap_sem); |
385 | retval = current->mm->start_brk; |
386 | current->mm->start_brk = 0; |
387 | goto error_kill; |
388 | } |
389 | |
390 | up_write(¤t->mm->mmap_sem); |
391 | |
392 | current->mm->brk = current->mm->start_brk; |
393 | current->mm->context.end_brk = current->mm->start_brk; |
394 | current->mm->context.end_brk += |
395 | (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0; |
396 | current->mm->start_stack = current->mm->start_brk + stack_size; |
397 | #endif |
398 | |
399 | install_exec_creds(bprm); |
400 | current->flags &= ~PF_FORKNOEXEC; |
401 | if (create_elf_fdpic_tables(bprm, current->mm, |
402 | &exec_params, &interp_params) < 0) |
403 | goto error_kill; |
404 | |
405 | kdebug("- start_code %lx", current->mm->start_code); |
406 | kdebug("- end_code %lx", current->mm->end_code); |
407 | kdebug("- start_data %lx", current->mm->start_data); |
408 | kdebug("- end_data %lx", current->mm->end_data); |
409 | kdebug("- start_brk %lx", current->mm->start_brk); |
410 | kdebug("- brk %lx", current->mm->brk); |
411 | kdebug("- start_stack %lx", current->mm->start_stack); |
412 | |
413 | #ifdef ELF_FDPIC_PLAT_INIT |
414 | /* |
415 | * The ABI may specify that certain registers be set up in special |
416 | * ways (on i386 %edx is the address of a DT_FINI function, for |
417 | * example. This macro performs whatever initialization to |
418 | * the regs structure is required. |
419 | */ |
420 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; |
421 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, |
422 | dynaddr); |
423 | #endif |
424 | |
425 | /* everything is now ready... get the userspace context ready to roll */ |
426 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
427 | start_thread(regs, entryaddr, current->mm->start_stack); |
428 | |
429 | retval = 0; |
430 | |
431 | error: |
432 | if (interpreter) { |
433 | allow_write_access(interpreter); |
434 | fput(interpreter); |
435 | } |
436 | kfree(interpreter_name); |
437 | kfree(exec_params.phdrs); |
438 | kfree(exec_params.loadmap); |
439 | kfree(interp_params.phdrs); |
440 | kfree(interp_params.loadmap); |
441 | return retval; |
442 | |
443 | /* unrecoverable error - kill the process */ |
444 | error_kill: |
445 | send_sig(SIGSEGV, current, 0); |
446 | goto error; |
447 | |
448 | } |
449 | |
450 | /*****************************************************************************/ |
451 | |
452 | #ifndef ELF_BASE_PLATFORM |
453 | /* |
454 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. |
455 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value |
456 | * will be copied to the user stack in the same manner as AT_PLATFORM. |
457 | */ |
458 | #define ELF_BASE_PLATFORM NULL |
459 | #endif |
460 | |
461 | /* |
462 | * present useful information to the program by shovelling it onto the new |
463 | * process's stack |
464 | */ |
465 | static int create_elf_fdpic_tables(struct linux_binprm *bprm, |
466 | struct mm_struct *mm, |
467 | struct elf_fdpic_params *exec_params, |
468 | struct elf_fdpic_params *interp_params) |
469 | { |
470 | const struct cred *cred = current_cred(); |
471 | unsigned long sp, csp, nitems; |
472 | elf_caddr_t __user *argv, *envp; |
473 | size_t platform_len = 0, len; |
474 | char *k_platform, *k_base_platform; |
475 | char __user *u_platform, *u_base_platform, *p; |
476 | long hwcap; |
477 | int loop; |
478 | int nr; /* reset for each csp adjustment */ |
479 | |
480 | #ifdef CONFIG_MMU |
481 | /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions |
482 | * by the processes running on the same package. One thing we can do is |
483 | * to shuffle the initial stack for them, so we give the architecture |
484 | * an opportunity to do so here. |
485 | */ |
486 | sp = arch_align_stack(bprm->p); |
487 | #else |
488 | sp = mm->start_stack; |
489 | |
490 | /* stack the program arguments and environment */ |
491 | if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0) |
492 | return -EFAULT; |
493 | #endif |
494 | |
495 | hwcap = ELF_HWCAP; |
496 | |
497 | /* |
498 | * If this architecture has a platform capability string, copy it |
499 | * to userspace. In some cases (Sparc), this info is impossible |
500 | * for userspace to get any other way, in others (i386) it is |
501 | * merely difficult. |
502 | */ |
503 | k_platform = ELF_PLATFORM; |
504 | u_platform = NULL; |
505 | |
506 | if (k_platform) { |
507 | platform_len = strlen(k_platform) + 1; |
508 | sp -= platform_len; |
509 | u_platform = (char __user *) sp; |
510 | if (__copy_to_user(u_platform, k_platform, platform_len) != 0) |
511 | return -EFAULT; |
512 | } |
513 | |
514 | /* |
515 | * If this architecture has a "base" platform capability |
516 | * string, copy it to userspace. |
517 | */ |
518 | k_base_platform = ELF_BASE_PLATFORM; |
519 | u_base_platform = NULL; |
520 | |
521 | if (k_base_platform) { |
522 | platform_len = strlen(k_base_platform) + 1; |
523 | sp -= platform_len; |
524 | u_base_platform = (char __user *) sp; |
525 | if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0) |
526 | return -EFAULT; |
527 | } |
528 | |
529 | sp &= ~7UL; |
530 | |
531 | /* stack the load map(s) */ |
532 | len = sizeof(struct elf32_fdpic_loadmap); |
533 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; |
534 | sp = (sp - len) & ~7UL; |
535 | exec_params->map_addr = sp; |
536 | |
537 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
538 | return -EFAULT; |
539 | |
540 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; |
541 | |
542 | if (interp_params->loadmap) { |
543 | len = sizeof(struct elf32_fdpic_loadmap); |
544 | len += sizeof(struct elf32_fdpic_loadseg) * |
545 | interp_params->loadmap->nsegs; |
546 | sp = (sp - len) & ~7UL; |
547 | interp_params->map_addr = sp; |
548 | |
549 | if (copy_to_user((void __user *) sp, interp_params->loadmap, |
550 | len) != 0) |
551 | return -EFAULT; |
552 | |
553 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; |
554 | } |
555 | |
556 | /* force 16 byte _final_ alignment here for generality */ |
557 | #define DLINFO_ITEMS 15 |
558 | |
559 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + |
560 | (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH; |
561 | |
562 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) |
563 | nitems++; |
564 | |
565 | csp = sp; |
566 | sp -= nitems * 2 * sizeof(unsigned long); |
567 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ |
568 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ |
569 | sp -= 1 * sizeof(unsigned long); /* argc */ |
570 | |
571 | csp -= sp & 15UL; |
572 | sp -= sp & 15UL; |
573 | |
574 | /* put the ELF interpreter info on the stack */ |
575 | #define NEW_AUX_ENT(id, val) \ |
576 | do { \ |
577 | struct { unsigned long _id, _val; } __user *ent; \ |
578 | \ |
579 | ent = (void __user *) csp; \ |
580 | __put_user((id), &ent[nr]._id); \ |
581 | __put_user((val), &ent[nr]._val); \ |
582 | nr++; \ |
583 | } while (0) |
584 | |
585 | nr = 0; |
586 | csp -= 2 * sizeof(unsigned long); |
587 | NEW_AUX_ENT(AT_NULL, 0); |
588 | if (k_platform) { |
589 | nr = 0; |
590 | csp -= 2 * sizeof(unsigned long); |
591 | NEW_AUX_ENT(AT_PLATFORM, |
592 | (elf_addr_t) (unsigned long) u_platform); |
593 | } |
594 | |
595 | if (k_base_platform) { |
596 | nr = 0; |
597 | csp -= 2 * sizeof(unsigned long); |
598 | NEW_AUX_ENT(AT_BASE_PLATFORM, |
599 | (elf_addr_t) (unsigned long) u_base_platform); |
600 | } |
601 | |
602 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
603 | nr = 0; |
604 | csp -= 2 * sizeof(unsigned long); |
605 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); |
606 | } |
607 | |
608 | nr = 0; |
609 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); |
610 | NEW_AUX_ENT(AT_HWCAP, hwcap); |
611 | NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE); |
612 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); |
613 | NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr); |
614 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
615 | NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum); |
616 | NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr); |
617 | NEW_AUX_ENT(AT_FLAGS, 0); |
618 | NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr); |
619 | NEW_AUX_ENT(AT_UID, (elf_addr_t) cred->uid); |
620 | NEW_AUX_ENT(AT_EUID, (elf_addr_t) cred->euid); |
621 | NEW_AUX_ENT(AT_GID, (elf_addr_t) cred->gid); |
622 | NEW_AUX_ENT(AT_EGID, (elf_addr_t) cred->egid); |
623 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
624 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
625 | |
626 | #ifdef ARCH_DLINFO |
627 | nr = 0; |
628 | csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long); |
629 | |
630 | /* ARCH_DLINFO must come last so platform specific code can enforce |
631 | * special alignment requirements on the AUXV if necessary (eg. PPC). |
632 | */ |
633 | ARCH_DLINFO; |
634 | #endif |
635 | #undef NEW_AUX_ENT |
636 | |
637 | /* allocate room for argv[] and envv[] */ |
638 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); |
639 | envp = (elf_caddr_t __user *) csp; |
640 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
641 | argv = (elf_caddr_t __user *) csp; |
642 | |
643 | /* stack argc */ |
644 | csp -= sizeof(unsigned long); |
645 | __put_user(bprm->argc, (unsigned long __user *) csp); |
646 | |
647 | BUG_ON(csp != sp); |
648 | |
649 | /* fill in the argv[] array */ |
650 | #ifdef CONFIG_MMU |
651 | current->mm->arg_start = bprm->p; |
652 | #else |
653 | current->mm->arg_start = current->mm->start_stack - |
654 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); |
655 | #endif |
656 | |
657 | p = (char __user *) current->mm->arg_start; |
658 | for (loop = bprm->argc; loop > 0; loop--) { |
659 | __put_user((elf_caddr_t) p, argv++); |
660 | len = strnlen_user(p, MAX_ARG_STRLEN); |
661 | if (!len || len > MAX_ARG_STRLEN) |
662 | return -EINVAL; |
663 | p += len; |
664 | } |
665 | __put_user(NULL, argv); |
666 | current->mm->arg_end = (unsigned long) p; |
667 | |
668 | /* fill in the envv[] array */ |
669 | current->mm->env_start = (unsigned long) p; |
670 | for (loop = bprm->envc; loop > 0; loop--) { |
671 | __put_user((elf_caddr_t)(unsigned long) p, envp++); |
672 | len = strnlen_user(p, MAX_ARG_STRLEN); |
673 | if (!len || len > MAX_ARG_STRLEN) |
674 | return -EINVAL; |
675 | p += len; |
676 | } |
677 | __put_user(NULL, envp); |
678 | current->mm->env_end = (unsigned long) p; |
679 | |
680 | mm->start_stack = (unsigned long) sp; |
681 | return 0; |
682 | } |
683 | |
684 | /*****************************************************************************/ |
685 | /* |
686 | * transfer the program arguments and environment from the holding pages onto |
687 | * the stack |
688 | */ |
689 | #ifndef CONFIG_MMU |
690 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm, |
691 | unsigned long *_sp) |
692 | { |
693 | unsigned long index, stop, sp; |
694 | char *src; |
695 | int ret = 0; |
696 | |
697 | stop = bprm->p >> PAGE_SHIFT; |
698 | sp = *_sp; |
699 | |
700 | for (index = MAX_ARG_PAGES - 1; index >= stop; index--) { |
701 | src = kmap(bprm->page[index]); |
702 | sp -= PAGE_SIZE; |
703 | if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0) |
704 | ret = -EFAULT; |
705 | kunmap(bprm->page[index]); |
706 | if (ret < 0) |
707 | goto out; |
708 | } |
709 | |
710 | *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15; |
711 | |
712 | out: |
713 | return ret; |
714 | } |
715 | #endif |
716 | |
717 | /*****************************************************************************/ |
718 | /* |
719 | * load the appropriate binary image (executable or interpreter) into memory |
720 | * - we assume no MMU is available |
721 | * - if no other PIC bits are set in params->hdr->e_flags |
722 | * - we assume that the LOADable segments in the binary are independently relocatable |
723 | * - we assume R/O executable segments are shareable |
724 | * - else |
725 | * - we assume the loadable parts of the image to require fixed displacement |
726 | * - the image is not shareable |
727 | */ |
728 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, |
729 | struct file *file, |
730 | struct mm_struct *mm, |
731 | const char *what) |
732 | { |
733 | struct elf32_fdpic_loadmap *loadmap; |
734 | #ifdef CONFIG_MMU |
735 | struct elf32_fdpic_loadseg *mseg; |
736 | #endif |
737 | struct elf32_fdpic_loadseg *seg; |
738 | struct elf32_phdr *phdr; |
739 | unsigned long load_addr, stop; |
740 | unsigned nloads, tmp; |
741 | size_t size; |
742 | int loop, ret; |
743 | |
744 | /* allocate a load map table */ |
745 | nloads = 0; |
746 | for (loop = 0; loop < params->hdr.e_phnum; loop++) |
747 | if (params->phdrs[loop].p_type == PT_LOAD) |
748 | nloads++; |
749 | |
750 | if (nloads == 0) |
751 | return -ELIBBAD; |
752 | |
753 | size = sizeof(*loadmap) + nloads * sizeof(*seg); |
754 | loadmap = kzalloc(size, GFP_KERNEL); |
755 | if (!loadmap) |
756 | return -ENOMEM; |
757 | |
758 | params->loadmap = loadmap; |
759 | |
760 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; |
761 | loadmap->nsegs = nloads; |
762 | |
763 | load_addr = params->load_addr; |
764 | seg = loadmap->segs; |
765 | |
766 | /* map the requested LOADs into the memory space */ |
767 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
768 | case ELF_FDPIC_FLAG_CONSTDISP: |
769 | case ELF_FDPIC_FLAG_CONTIGUOUS: |
770 | #ifndef CONFIG_MMU |
771 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); |
772 | if (ret < 0) |
773 | return ret; |
774 | break; |
775 | #endif |
776 | default: |
777 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); |
778 | if (ret < 0) |
779 | return ret; |
780 | break; |
781 | } |
782 | |
783 | /* map the entry point */ |
784 | if (params->hdr.e_entry) { |
785 | seg = loadmap->segs; |
786 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
787 | if (params->hdr.e_entry >= seg->p_vaddr && |
788 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
789 | params->entry_addr = |
790 | (params->hdr.e_entry - seg->p_vaddr) + |
791 | seg->addr; |
792 | break; |
793 | } |
794 | } |
795 | } |
796 | |
797 | /* determine where the program header table has wound up if mapped */ |
798 | stop = params->hdr.e_phoff; |
799 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); |
800 | phdr = params->phdrs; |
801 | |
802 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
803 | if (phdr->p_type != PT_LOAD) |
804 | continue; |
805 | |
806 | if (phdr->p_offset > params->hdr.e_phoff || |
807 | phdr->p_offset + phdr->p_filesz < stop) |
808 | continue; |
809 | |
810 | seg = loadmap->segs; |
811 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
812 | if (phdr->p_vaddr >= seg->p_vaddr && |
813 | phdr->p_vaddr + phdr->p_filesz <= |
814 | seg->p_vaddr + seg->p_memsz) { |
815 | params->ph_addr = |
816 | (phdr->p_vaddr - seg->p_vaddr) + |
817 | seg->addr + |
818 | params->hdr.e_phoff - phdr->p_offset; |
819 | break; |
820 | } |
821 | } |
822 | break; |
823 | } |
824 | |
825 | /* determine where the dynamic section has wound up if there is one */ |
826 | phdr = params->phdrs; |
827 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
828 | if (phdr->p_type != PT_DYNAMIC) |
829 | continue; |
830 | |
831 | seg = loadmap->segs; |
832 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
833 | if (phdr->p_vaddr >= seg->p_vaddr && |
834 | phdr->p_vaddr + phdr->p_memsz <= |
835 | seg->p_vaddr + seg->p_memsz) { |
836 | params->dynamic_addr = |
837 | (phdr->p_vaddr - seg->p_vaddr) + |
838 | seg->addr; |
839 | |
840 | /* check the dynamic section contains at least |
841 | * one item, and that the last item is a NULL |
842 | * entry */ |
843 | if (phdr->p_memsz == 0 || |
844 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) |
845 | goto dynamic_error; |
846 | |
847 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); |
848 | if (((Elf32_Dyn *) |
849 | params->dynamic_addr)[tmp - 1].d_tag != 0) |
850 | goto dynamic_error; |
851 | break; |
852 | } |
853 | } |
854 | break; |
855 | } |
856 | |
857 | /* now elide adjacent segments in the load map on MMU linux |
858 | * - on uClinux the holes between may actually be filled with system |
859 | * stuff or stuff from other processes |
860 | */ |
861 | #ifdef CONFIG_MMU |
862 | nloads = loadmap->nsegs; |
863 | mseg = loadmap->segs; |
864 | seg = mseg + 1; |
865 | for (loop = 1; loop < nloads; loop++) { |
866 | /* see if we have a candidate for merging */ |
867 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { |
868 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); |
869 | if (load_addr == (seg->addr & PAGE_MASK)) { |
870 | mseg->p_memsz += |
871 | load_addr - |
872 | (mseg->addr + mseg->p_memsz); |
873 | mseg->p_memsz += seg->addr & ~PAGE_MASK; |
874 | mseg->p_memsz += seg->p_memsz; |
875 | loadmap->nsegs--; |
876 | continue; |
877 | } |
878 | } |
879 | |
880 | mseg++; |
881 | if (mseg != seg) |
882 | *mseg = *seg; |
883 | } |
884 | #endif |
885 | |
886 | kdebug("Mapped Object [%s]:", what); |
887 | kdebug("- elfhdr : %lx", params->elfhdr_addr); |
888 | kdebug("- entry : %lx", params->entry_addr); |
889 | kdebug("- PHDR[] : %lx", params->ph_addr); |
890 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); |
891 | seg = loadmap->segs; |
892 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) |
893 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", |
894 | loop, |
895 | seg->addr, seg->addr + seg->p_memsz - 1, |
896 | seg->p_vaddr, seg->p_memsz); |
897 | |
898 | return 0; |
899 | |
900 | dynamic_error: |
901 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
902 | what, file->f_path.dentry->d_inode->i_ino); |
903 | return -ELIBBAD; |
904 | } |
905 | |
906 | /*****************************************************************************/ |
907 | /* |
908 | * map a file with constant displacement under uClinux |
909 | */ |
910 | #ifndef CONFIG_MMU |
911 | static int elf_fdpic_map_file_constdisp_on_uclinux( |
912 | struct elf_fdpic_params *params, |
913 | struct file *file, |
914 | struct mm_struct *mm) |
915 | { |
916 | struct elf32_fdpic_loadseg *seg; |
917 | struct elf32_phdr *phdr; |
918 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags; |
919 | loff_t fpos; |
920 | int loop, ret; |
921 | |
922 | load_addr = params->load_addr; |
923 | seg = params->loadmap->segs; |
924 | |
925 | /* determine the bounds of the contiguous overall allocation we must |
926 | * make */ |
927 | phdr = params->phdrs; |
928 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
929 | if (params->phdrs[loop].p_type != PT_LOAD) |
930 | continue; |
931 | |
932 | if (base > phdr->p_vaddr) |
933 | base = phdr->p_vaddr; |
934 | if (top < phdr->p_vaddr + phdr->p_memsz) |
935 | top = phdr->p_vaddr + phdr->p_memsz; |
936 | } |
937 | |
938 | /* allocate one big anon block for everything */ |
939 | mflags = MAP_PRIVATE; |
940 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) |
941 | mflags |= MAP_EXECUTABLE; |
942 | |
943 | down_write(&mm->mmap_sem); |
944 | maddr = do_mmap(NULL, load_addr, top - base, |
945 | PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); |
946 | up_write(&mm->mmap_sem); |
947 | if (IS_ERR_VALUE(maddr)) |
948 | return (int) maddr; |
949 | |
950 | if (load_addr != 0) |
951 | load_addr += PAGE_ALIGN(top - base); |
952 | |
953 | /* and then load the file segments into it */ |
954 | phdr = params->phdrs; |
955 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
956 | if (params->phdrs[loop].p_type != PT_LOAD) |
957 | continue; |
958 | |
959 | fpos = phdr->p_offset; |
960 | |
961 | seg->addr = maddr + (phdr->p_vaddr - base); |
962 | seg->p_vaddr = phdr->p_vaddr; |
963 | seg->p_memsz = phdr->p_memsz; |
964 | |
965 | ret = file->f_op->read(file, (void *) seg->addr, |
966 | phdr->p_filesz, &fpos); |
967 | if (ret < 0) |
968 | return ret; |
969 | |
970 | /* map the ELF header address if in this segment */ |
971 | if (phdr->p_offset == 0) |
972 | params->elfhdr_addr = seg->addr; |
973 | |
974 | /* clear any space allocated but not loaded */ |
975 | if (phdr->p_filesz < phdr->p_memsz) { |
976 | ret = clear_user((void *) (seg->addr + phdr->p_filesz), |
977 | phdr->p_memsz - phdr->p_filesz); |
978 | if (ret) |
979 | return ret; |
980 | } |
981 | |
982 | if (mm) { |
983 | if (phdr->p_flags & PF_X) { |
984 | if (!mm->start_code) { |
985 | mm->start_code = seg->addr; |
986 | mm->end_code = seg->addr + |
987 | phdr->p_memsz; |
988 | } |
989 | } else if (!mm->start_data) { |
990 | mm->start_data = seg->addr; |
991 | #ifndef CONFIG_MMU |
992 | mm->end_data = seg->addr + phdr->p_memsz; |
993 | #endif |
994 | } |
995 | |
996 | #ifdef CONFIG_MMU |
997 | if (seg->addr + phdr->p_memsz > mm->end_data) |
998 | mm->end_data = seg->addr + phdr->p_memsz; |
999 | #endif |
1000 | } |
1001 | |
1002 | seg++; |
1003 | } |
1004 | |
1005 | return 0; |
1006 | } |
1007 | #endif |
1008 | |
1009 | /*****************************************************************************/ |
1010 | /* |
1011 | * map a binary by direct mmap() of the individual PT_LOAD segments |
1012 | */ |
1013 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, |
1014 | struct file *file, |
1015 | struct mm_struct *mm) |
1016 | { |
1017 | struct elf32_fdpic_loadseg *seg; |
1018 | struct elf32_phdr *phdr; |
1019 | unsigned long load_addr, delta_vaddr; |
1020 | int loop, dvset, ret; |
1021 | |
1022 | load_addr = params->load_addr; |
1023 | delta_vaddr = 0; |
1024 | dvset = 0; |
1025 | |
1026 | seg = params->loadmap->segs; |
1027 | |
1028 | /* deal with each load segment separately */ |
1029 | phdr = params->phdrs; |
1030 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
1031 | unsigned long maddr, disp, excess, excess1; |
1032 | int prot = 0, flags; |
1033 | |
1034 | if (phdr->p_type != PT_LOAD) |
1035 | continue; |
1036 | |
1037 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", |
1038 | (unsigned long) phdr->p_vaddr, |
1039 | (unsigned long) phdr->p_offset, |
1040 | (unsigned long) phdr->p_filesz, |
1041 | (unsigned long) phdr->p_memsz); |
1042 | |
1043 | /* determine the mapping parameters */ |
1044 | if (phdr->p_flags & PF_R) prot |= PROT_READ; |
1045 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; |
1046 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; |
1047 | |
1048 | flags = MAP_PRIVATE | MAP_DENYWRITE; |
1049 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) |
1050 | flags |= MAP_EXECUTABLE; |
1051 | |
1052 | maddr = 0; |
1053 | |
1054 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
1055 | case ELF_FDPIC_FLAG_INDEPENDENT: |
1056 | /* PT_LOADs are independently locatable */ |
1057 | break; |
1058 | |
1059 | case ELF_FDPIC_FLAG_HONOURVADDR: |
1060 | /* the specified virtual address must be honoured */ |
1061 | maddr = phdr->p_vaddr; |
1062 | flags |= MAP_FIXED; |
1063 | break; |
1064 | |
1065 | case ELF_FDPIC_FLAG_CONSTDISP: |
1066 | /* constant displacement |
1067 | * - can be mapped anywhere, but must be mapped as a |
1068 | * unit |
1069 | */ |
1070 | if (!dvset) { |
1071 | maddr = load_addr; |
1072 | delta_vaddr = phdr->p_vaddr; |
1073 | dvset = 1; |
1074 | } else { |
1075 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
1076 | flags |= MAP_FIXED; |
1077 | } |
1078 | break; |
1079 | |
1080 | case ELF_FDPIC_FLAG_CONTIGUOUS: |
1081 | /* contiguity handled later */ |
1082 | break; |
1083 | |
1084 | default: |
1085 | BUG(); |
1086 | } |
1087 | |
1088 | maddr &= PAGE_MASK; |
1089 | |
1090 | /* create the mapping */ |
1091 | disp = phdr->p_vaddr & ~PAGE_MASK; |
1092 | down_write(&mm->mmap_sem); |
1093 | maddr = do_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, |
1094 | phdr->p_offset - disp); |
1095 | up_write(&mm->mmap_sem); |
1096 | |
1097 | kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", |
1098 | loop, phdr->p_memsz + disp, prot, flags, |
1099 | phdr->p_offset - disp, maddr); |
1100 | |
1101 | if (IS_ERR_VALUE(maddr)) |
1102 | return (int) maddr; |
1103 | |
1104 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
1105 | ELF_FDPIC_FLAG_CONTIGUOUS) |
1106 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
1107 | |
1108 | seg->addr = maddr + disp; |
1109 | seg->p_vaddr = phdr->p_vaddr; |
1110 | seg->p_memsz = phdr->p_memsz; |
1111 | |
1112 | /* map the ELF header address if in this segment */ |
1113 | if (phdr->p_offset == 0) |
1114 | params->elfhdr_addr = seg->addr; |
1115 | |
1116 | /* clear the bit between beginning of mapping and beginning of |
1117 | * PT_LOAD */ |
1118 | if (prot & PROT_WRITE && disp > 0) { |
1119 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); |
1120 | ret = clear_user((void __user *) maddr, disp); |
1121 | if (ret) |
1122 | return ret; |
1123 | maddr += disp; |
1124 | } |
1125 | |
1126 | /* clear any space allocated but not loaded |
1127 | * - on uClinux we can just clear the lot |
1128 | * - on MMU linux we'll get a SIGBUS beyond the last page |
1129 | * extant in the file |
1130 | */ |
1131 | excess = phdr->p_memsz - phdr->p_filesz; |
1132 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); |
1133 | |
1134 | #ifdef CONFIG_MMU |
1135 | if (excess > excess1) { |
1136 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; |
1137 | unsigned long xmaddr; |
1138 | |
1139 | flags |= MAP_FIXED | MAP_ANONYMOUS; |
1140 | down_write(&mm->mmap_sem); |
1141 | xmaddr = do_mmap(NULL, xaddr, excess - excess1, |
1142 | prot, flags, 0); |
1143 | up_write(&mm->mmap_sem); |
1144 | |
1145 | kdebug("mmap[%d] <anon>" |
1146 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", |
1147 | loop, xaddr, excess - excess1, prot, flags, |
1148 | xmaddr); |
1149 | |
1150 | if (xmaddr != xaddr) |
1151 | return -ENOMEM; |
1152 | } |
1153 | |
1154 | if (prot & PROT_WRITE && excess1 > 0) { |
1155 | kdebug("clear[%d] ad=%lx sz=%lx", |
1156 | loop, maddr + phdr->p_filesz, excess1); |
1157 | ret = clear_user((void __user *) maddr + phdr->p_filesz, |
1158 | excess1); |
1159 | if (ret) |
1160 | return ret; |
1161 | } |
1162 | |
1163 | #else |
1164 | if (excess > 0) { |
1165 | kdebug("clear[%d] ad=%lx sz=%lx", |
1166 | loop, maddr + phdr->p_filesz, excess); |
1167 | ret = clear_user((void *) maddr + phdr->p_filesz, excess); |
1168 | if (ret) |
1169 | return ret; |
1170 | } |
1171 | #endif |
1172 | |
1173 | if (mm) { |
1174 | if (phdr->p_flags & PF_X) { |
1175 | if (!mm->start_code) { |
1176 | mm->start_code = maddr; |
1177 | mm->end_code = maddr + phdr->p_memsz; |
1178 | } |
1179 | } else if (!mm->start_data) { |
1180 | mm->start_data = maddr; |
1181 | mm->end_data = maddr + phdr->p_memsz; |
1182 | } |
1183 | } |
1184 | |
1185 | seg++; |
1186 | } |
1187 | |
1188 | return 0; |
1189 | } |
1190 | |
1191 | /*****************************************************************************/ |
1192 | /* |
1193 | * ELF-FDPIC core dumper |
1194 | * |
1195 | * Modelled on fs/exec.c:aout_core_dump() |
1196 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> |
1197 | * |
1198 | * Modelled on fs/binfmt_elf.c core dumper |
1199 | */ |
1200 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
1201 | |
1202 | /* |
1203 | * These are the only things you should do on a core-file: use only these |
1204 | * functions to write out all the necessary info. |
1205 | */ |
1206 | static int dump_write(struct file *file, const void *addr, int nr) |
1207 | { |
1208 | return file->f_op->write(file, addr, nr, &file->f_pos) == nr; |
1209 | } |
1210 | |
1211 | static int dump_seek(struct file *file, loff_t off) |
1212 | { |
1213 | if (file->f_op->llseek) { |
1214 | if (file->f_op->llseek(file, off, SEEK_SET) != off) |
1215 | return 0; |
1216 | } else { |
1217 | file->f_pos = off; |
1218 | } |
1219 | return 1; |
1220 | } |
1221 | |
1222 | /* |
1223 | * Decide whether a segment is worth dumping; default is yes to be |
1224 | * sure (missing info is worse than too much; etc). |
1225 | * Personally I'd include everything, and use the coredump limit... |
1226 | * |
1227 | * I think we should skip something. But I am not sure how. H.J. |
1228 | */ |
1229 | static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) |
1230 | { |
1231 | int dump_ok; |
1232 | |
1233 | /* Do not dump I/O mapped devices or special mappings */ |
1234 | if (vma->vm_flags & (VM_IO | VM_RESERVED)) { |
1235 | kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags); |
1236 | return 0; |
1237 | } |
1238 | |
1239 | /* If we may not read the contents, don't allow us to dump |
1240 | * them either. "dump_write()" can't handle it anyway. |
1241 | */ |
1242 | if (!(vma->vm_flags & VM_READ)) { |
1243 | kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags); |
1244 | return 0; |
1245 | } |
1246 | |
1247 | /* By default, dump shared memory if mapped from an anonymous file. */ |
1248 | if (vma->vm_flags & VM_SHARED) { |
1249 | if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0) { |
1250 | dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags); |
1251 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, |
1252 | vma->vm_flags, dump_ok ? "yes" : "no"); |
1253 | return dump_ok; |
1254 | } |
1255 | |
1256 | dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags); |
1257 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, |
1258 | vma->vm_flags, dump_ok ? "yes" : "no"); |
1259 | return dump_ok; |
1260 | } |
1261 | |
1262 | #ifdef CONFIG_MMU |
1263 | /* By default, if it hasn't been written to, don't write it out */ |
1264 | if (!vma->anon_vma) { |
1265 | dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags); |
1266 | kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start, |
1267 | vma->vm_flags, dump_ok ? "yes" : "no"); |
1268 | return dump_ok; |
1269 | } |
1270 | #endif |
1271 | |
1272 | dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags); |
1273 | kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags, |
1274 | dump_ok ? "yes" : "no"); |
1275 | return dump_ok; |
1276 | } |
1277 | |
1278 | /* An ELF note in memory */ |
1279 | struct memelfnote |
1280 | { |
1281 | const char *name; |
1282 | int type; |
1283 | unsigned int datasz; |
1284 | void *data; |
1285 | }; |
1286 | |
1287 | static int notesize(struct memelfnote *en) |
1288 | { |
1289 | int sz; |
1290 | |
1291 | sz = sizeof(struct elf_note); |
1292 | sz += roundup(strlen(en->name) + 1, 4); |
1293 | sz += roundup(en->datasz, 4); |
1294 | |
1295 | return sz; |
1296 | } |
1297 | |
1298 | /* #define DEBUG */ |
1299 | |
1300 | #define DUMP_WRITE(addr, nr) \ |
1301 | do { if (!dump_write(file, (addr), (nr))) return 0; } while(0) |
1302 | #define DUMP_SEEK(off) \ |
1303 | do { if (!dump_seek(file, (off))) return 0; } while(0) |
1304 | |
1305 | static int writenote(struct memelfnote *men, struct file *file) |
1306 | { |
1307 | struct elf_note en; |
1308 | |
1309 | en.n_namesz = strlen(men->name) + 1; |
1310 | en.n_descsz = men->datasz; |
1311 | en.n_type = men->type; |
1312 | |
1313 | DUMP_WRITE(&en, sizeof(en)); |
1314 | DUMP_WRITE(men->name, en.n_namesz); |
1315 | /* XXX - cast from long long to long to avoid need for libgcc.a */ |
1316 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ |
1317 | DUMP_WRITE(men->data, men->datasz); |
1318 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ |
1319 | |
1320 | return 1; |
1321 | } |
1322 | #undef DUMP_WRITE |
1323 | #undef DUMP_SEEK |
1324 | |
1325 | #define DUMP_WRITE(addr, nr) \ |
1326 | if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \ |
1327 | goto end_coredump; |
1328 | #define DUMP_SEEK(off) \ |
1329 | if (!dump_seek(file, (off))) \ |
1330 | goto end_coredump; |
1331 | |
1332 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) |
1333 | { |
1334 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
1335 | elf->e_ident[EI_CLASS] = ELF_CLASS; |
1336 | elf->e_ident[EI_DATA] = ELF_DATA; |
1337 | elf->e_ident[EI_VERSION] = EV_CURRENT; |
1338 | elf->e_ident[EI_OSABI] = ELF_OSABI; |
1339 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); |
1340 | |
1341 | elf->e_type = ET_CORE; |
1342 | elf->e_machine = ELF_ARCH; |
1343 | elf->e_version = EV_CURRENT; |
1344 | elf->e_entry = 0; |
1345 | elf->e_phoff = sizeof(struct elfhdr); |
1346 | elf->e_shoff = 0; |
1347 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS; |
1348 | elf->e_ehsize = sizeof(struct elfhdr); |
1349 | elf->e_phentsize = sizeof(struct elf_phdr); |
1350 | elf->e_phnum = segs; |
1351 | elf->e_shentsize = 0; |
1352 | elf->e_shnum = 0; |
1353 | elf->e_shstrndx = 0; |
1354 | return; |
1355 | } |
1356 | |
1357 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1358 | { |
1359 | phdr->p_type = PT_NOTE; |
1360 | phdr->p_offset = offset; |
1361 | phdr->p_vaddr = 0; |
1362 | phdr->p_paddr = 0; |
1363 | phdr->p_filesz = sz; |
1364 | phdr->p_memsz = 0; |
1365 | phdr->p_flags = 0; |
1366 | phdr->p_align = 0; |
1367 | return; |
1368 | } |
1369 | |
1370 | static inline void fill_note(struct memelfnote *note, const char *name, int type, |
1371 | unsigned int sz, void *data) |
1372 | { |
1373 | note->name = name; |
1374 | note->type = type; |
1375 | note->datasz = sz; |
1376 | note->data = data; |
1377 | return; |
1378 | } |
1379 | |
1380 | /* |
1381 | * fill up all the fields in prstatus from the given task struct, except |
1382 | * registers which need to be filled up seperately. |
1383 | */ |
1384 | static void fill_prstatus(struct elf_prstatus *prstatus, |
1385 | struct task_struct *p, long signr) |
1386 | { |
1387 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; |
1388 | prstatus->pr_sigpend = p->pending.signal.sig[0]; |
1389 | prstatus->pr_sighold = p->blocked.sig[0]; |
1390 | rcu_read_lock(); |
1391 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); |
1392 | rcu_read_unlock(); |
1393 | prstatus->pr_pid = task_pid_vnr(p); |
1394 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1395 | prstatus->pr_sid = task_session_vnr(p); |
1396 | if (thread_group_leader(p)) { |
1397 | struct task_cputime cputime; |
1398 | |
1399 | /* |
1400 | * This is the record for the group leader. It shows the |
1401 | * group-wide total, not its individual thread total. |
1402 | */ |
1403 | thread_group_cputime(p, &cputime); |
1404 | cputime_to_timeval(cputime.utime, &prstatus->pr_utime); |
1405 | cputime_to_timeval(cputime.stime, &prstatus->pr_stime); |
1406 | } else { |
1407 | cputime_to_timeval(p->utime, &prstatus->pr_utime); |
1408 | cputime_to_timeval(p->stime, &prstatus->pr_stime); |
1409 | } |
1410 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); |
1411 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); |
1412 | |
1413 | prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; |
1414 | prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; |
1415 | } |
1416 | |
1417 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, |
1418 | struct mm_struct *mm) |
1419 | { |
1420 | const struct cred *cred; |
1421 | unsigned int i, len; |
1422 | |
1423 | /* first copy the parameters from user space */ |
1424 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); |
1425 | |
1426 | len = mm->arg_end - mm->arg_start; |
1427 | if (len >= ELF_PRARGSZ) |
1428 | len = ELF_PRARGSZ - 1; |
1429 | if (copy_from_user(&psinfo->pr_psargs, |
1430 | (const char __user *) mm->arg_start, len)) |
1431 | return -EFAULT; |
1432 | for (i = 0; i < len; i++) |
1433 | if (psinfo->pr_psargs[i] == 0) |
1434 | psinfo->pr_psargs[i] = ' '; |
1435 | psinfo->pr_psargs[len] = 0; |
1436 | |
1437 | rcu_read_lock(); |
1438 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); |
1439 | rcu_read_unlock(); |
1440 | psinfo->pr_pid = task_pid_vnr(p); |
1441 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1442 | psinfo->pr_sid = task_session_vnr(p); |
1443 | |
1444 | i = p->state ? ffz(~p->state) + 1 : 0; |
1445 | psinfo->pr_state = i; |
1446 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1447 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
1448 | psinfo->pr_nice = task_nice(p); |
1449 | psinfo->pr_flag = p->flags; |
1450 | rcu_read_lock(); |
1451 | cred = __task_cred(p); |
1452 | SET_UID(psinfo->pr_uid, cred->uid); |
1453 | SET_GID(psinfo->pr_gid, cred->gid); |
1454 | rcu_read_unlock(); |
1455 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1456 | |
1457 | return 0; |
1458 | } |
1459 | |
1460 | /* Here is the structure in which status of each thread is captured. */ |
1461 | struct elf_thread_status |
1462 | { |
1463 | struct list_head list; |
1464 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ |
1465 | elf_fpregset_t fpu; /* NT_PRFPREG */ |
1466 | struct task_struct *thread; |
1467 | #ifdef ELF_CORE_COPY_XFPREGS |
1468 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
1469 | #endif |
1470 | struct memelfnote notes[3]; |
1471 | int num_notes; |
1472 | }; |
1473 | |
1474 | /* |
1475 | * In order to add the specific thread information for the elf file format, |
1476 | * we need to keep a linked list of every thread's pr_status and then create |
1477 | * a single section for them in the final core file. |
1478 | */ |
1479 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) |
1480 | { |
1481 | struct task_struct *p = t->thread; |
1482 | int sz = 0; |
1483 | |
1484 | t->num_notes = 0; |
1485 | |
1486 | fill_prstatus(&t->prstatus, p, signr); |
1487 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); |
1488 | |
1489 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
1490 | &t->prstatus); |
1491 | t->num_notes++; |
1492 | sz += notesize(&t->notes[0]); |
1493 | |
1494 | t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu); |
1495 | if (t->prstatus.pr_fpvalid) { |
1496 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), |
1497 | &t->fpu); |
1498 | t->num_notes++; |
1499 | sz += notesize(&t->notes[1]); |
1500 | } |
1501 | |
1502 | #ifdef ELF_CORE_COPY_XFPREGS |
1503 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { |
1504 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1505 | sizeof(t->xfpu), &t->xfpu); |
1506 | t->num_notes++; |
1507 | sz += notesize(&t->notes[2]); |
1508 | } |
1509 | #endif |
1510 | return sz; |
1511 | } |
1512 | |
1513 | /* |
1514 | * dump the segments for an MMU process |
1515 | */ |
1516 | #ifdef CONFIG_MMU |
1517 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
1518 | unsigned long *limit, unsigned long mm_flags) |
1519 | { |
1520 | struct vm_area_struct *vma; |
1521 | |
1522 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
1523 | unsigned long addr; |
1524 | |
1525 | if (!maydump(vma, mm_flags)) |
1526 | continue; |
1527 | |
1528 | for (addr = vma->vm_start; |
1529 | addr < vma->vm_end; |
1530 | addr += PAGE_SIZE |
1531 | ) { |
1532 | struct vm_area_struct *vma; |
1533 | struct page *page; |
1534 | |
1535 | if (get_user_pages(current, current->mm, addr, 1, 0, 1, |
1536 | &page, &vma) <= 0) { |
1537 | DUMP_SEEK(file->f_pos + PAGE_SIZE); |
1538 | } |
1539 | else if (page == ZERO_PAGE(0)) { |
1540 | page_cache_release(page); |
1541 | DUMP_SEEK(file->f_pos + PAGE_SIZE); |
1542 | } |
1543 | else { |
1544 | void *kaddr; |
1545 | |
1546 | flush_cache_page(vma, addr, page_to_pfn(page)); |
1547 | kaddr = kmap(page); |
1548 | if ((*size += PAGE_SIZE) > *limit || |
1549 | !dump_write(file, kaddr, PAGE_SIZE) |
1550 | ) { |
1551 | kunmap(page); |
1552 | page_cache_release(page); |
1553 | return -EIO; |
1554 | } |
1555 | kunmap(page); |
1556 | page_cache_release(page); |
1557 | } |
1558 | } |
1559 | } |
1560 | |
1561 | return 0; |
1562 | |
1563 | end_coredump: |
1564 | return -EFBIG; |
1565 | } |
1566 | #endif |
1567 | |
1568 | /* |
1569 | * dump the segments for a NOMMU process |
1570 | */ |
1571 | #ifndef CONFIG_MMU |
1572 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
1573 | unsigned long *limit, unsigned long mm_flags) |
1574 | { |
1575 | struct vm_area_struct *vma; |
1576 | |
1577 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
1578 | if (!maydump(vma, mm_flags)) |
1579 | continue; |
1580 | |
1581 | if ((*size += PAGE_SIZE) > *limit) |
1582 | return -EFBIG; |
1583 | |
1584 | if (!dump_write(file, (void *) vma->vm_start, |
1585 | vma->vm_end - vma->vm_start)) |
1586 | return -EIO; |
1587 | } |
1588 | |
1589 | return 0; |
1590 | } |
1591 | #endif |
1592 | |
1593 | /* |
1594 | * Actual dumper |
1595 | * |
1596 | * This is a two-pass process; first we find the offsets of the bits, |
1597 | * and then they are actually written out. If we run out of core limit |
1598 | * we just truncate. |
1599 | */ |
1600 | static int elf_fdpic_core_dump(long signr, struct pt_regs *regs, |
1601 | struct file *file, unsigned long limit) |
1602 | { |
1603 | #define NUM_NOTES 6 |
1604 | int has_dumped = 0; |
1605 | mm_segment_t fs; |
1606 | int segs; |
1607 | size_t size = 0; |
1608 | int i; |
1609 | struct vm_area_struct *vma; |
1610 | struct elfhdr *elf = NULL; |
1611 | loff_t offset = 0, dataoff; |
1612 | int numnote; |
1613 | struct memelfnote *notes = NULL; |
1614 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ |
1615 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ |
1616 | LIST_HEAD(thread_list); |
1617 | struct list_head *t; |
1618 | elf_fpregset_t *fpu = NULL; |
1619 | #ifdef ELF_CORE_COPY_XFPREGS |
1620 | elf_fpxregset_t *xfpu = NULL; |
1621 | #endif |
1622 | int thread_status_size = 0; |
1623 | elf_addr_t *auxv; |
1624 | unsigned long mm_flags; |
1625 | |
1626 | /* |
1627 | * We no longer stop all VM operations. |
1628 | * |
1629 | * This is because those proceses that could possibly change map_count |
1630 | * or the mmap / vma pages are now blocked in do_exit on current |
1631 | * finishing this core dump. |
1632 | * |
1633 | * Only ptrace can touch these memory addresses, but it doesn't change |
1634 | * the map_count or the pages allocated. So no possibility of crashing |
1635 | * exists while dumping the mm->vm_next areas to the core file. |
1636 | */ |
1637 | |
1638 | /* alloc memory for large data structures: too large to be on stack */ |
1639 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); |
1640 | if (!elf) |
1641 | goto cleanup; |
1642 | prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL); |
1643 | if (!prstatus) |
1644 | goto cleanup; |
1645 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); |
1646 | if (!psinfo) |
1647 | goto cleanup; |
1648 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); |
1649 | if (!notes) |
1650 | goto cleanup; |
1651 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); |
1652 | if (!fpu) |
1653 | goto cleanup; |
1654 | #ifdef ELF_CORE_COPY_XFPREGS |
1655 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); |
1656 | if (!xfpu) |
1657 | goto cleanup; |
1658 | #endif |
1659 | |
1660 | if (signr) { |
1661 | struct core_thread *ct; |
1662 | struct elf_thread_status *tmp; |
1663 | |
1664 | for (ct = current->mm->core_state->dumper.next; |
1665 | ct; ct = ct->next) { |
1666 | tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); |
1667 | if (!tmp) |
1668 | goto cleanup; |
1669 | |
1670 | tmp->thread = ct->task; |
1671 | list_add(&tmp->list, &thread_list); |
1672 | } |
1673 | |
1674 | list_for_each(t, &thread_list) { |
1675 | struct elf_thread_status *tmp; |
1676 | int sz; |
1677 | |
1678 | tmp = list_entry(t, struct elf_thread_status, list); |
1679 | sz = elf_dump_thread_status(signr, tmp); |
1680 | thread_status_size += sz; |
1681 | } |
1682 | } |
1683 | |
1684 | /* now collect the dump for the current */ |
1685 | fill_prstatus(prstatus, current, signr); |
1686 | elf_core_copy_regs(&prstatus->pr_reg, regs); |
1687 | |
1688 | segs = current->mm->map_count; |
1689 | #ifdef ELF_CORE_EXTRA_PHDRS |
1690 | segs += ELF_CORE_EXTRA_PHDRS; |
1691 | #endif |
1692 | |
1693 | /* Set up header */ |
1694 | fill_elf_fdpic_header(elf, segs + 1); /* including notes section */ |
1695 | |
1696 | has_dumped = 1; |
1697 | current->flags |= PF_DUMPCORE; |
1698 | |
1699 | /* |
1700 | * Set up the notes in similar form to SVR4 core dumps made |
1701 | * with info from their /proc. |
1702 | */ |
1703 | |
1704 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); |
1705 | fill_psinfo(psinfo, current->group_leader, current->mm); |
1706 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
1707 | |
1708 | numnote = 2; |
1709 | |
1710 | auxv = (elf_addr_t *) current->mm->saved_auxv; |
1711 | |
1712 | i = 0; |
1713 | do |
1714 | i += 2; |
1715 | while (auxv[i - 2] != AT_NULL); |
1716 | fill_note(¬es[numnote++], "CORE", NT_AUXV, |
1717 | i * sizeof(elf_addr_t), auxv); |
1718 | |
1719 | /* Try to dump the FPU. */ |
1720 | if ((prstatus->pr_fpvalid = |
1721 | elf_core_copy_task_fpregs(current, regs, fpu))) |
1722 | fill_note(notes + numnote++, |
1723 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); |
1724 | #ifdef ELF_CORE_COPY_XFPREGS |
1725 | if (elf_core_copy_task_xfpregs(current, xfpu)) |
1726 | fill_note(notes + numnote++, |
1727 | "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu); |
1728 | #endif |
1729 | |
1730 | fs = get_fs(); |
1731 | set_fs(KERNEL_DS); |
1732 | |
1733 | DUMP_WRITE(elf, sizeof(*elf)); |
1734 | offset += sizeof(*elf); /* Elf header */ |
1735 | offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */ |
1736 | |
1737 | /* Write notes phdr entry */ |
1738 | { |
1739 | struct elf_phdr phdr; |
1740 | int sz = 0; |
1741 | |
1742 | for (i = 0; i < numnote; i++) |
1743 | sz += notesize(notes + i); |
1744 | |
1745 | sz += thread_status_size; |
1746 | |
1747 | fill_elf_note_phdr(&phdr, sz, offset); |
1748 | offset += sz; |
1749 | DUMP_WRITE(&phdr, sizeof(phdr)); |
1750 | } |
1751 | |
1752 | /* Page-align dumped data */ |
1753 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
1754 | |
1755 | /* |
1756 | * We must use the same mm->flags while dumping core to avoid |
1757 | * inconsistency between the program headers and bodies, otherwise an |
1758 | * unusable core file can be generated. |
1759 | */ |
1760 | mm_flags = current->mm->flags; |
1761 | |
1762 | /* write program headers for segments dump */ |
1763 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
1764 | struct elf_phdr phdr; |
1765 | size_t sz; |
1766 | |
1767 | sz = vma->vm_end - vma->vm_start; |
1768 | |
1769 | phdr.p_type = PT_LOAD; |
1770 | phdr.p_offset = offset; |
1771 | phdr.p_vaddr = vma->vm_start; |
1772 | phdr.p_paddr = 0; |
1773 | phdr.p_filesz = maydump(vma, mm_flags) ? sz : 0; |
1774 | phdr.p_memsz = sz; |
1775 | offset += phdr.p_filesz; |
1776 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; |
1777 | if (vma->vm_flags & VM_WRITE) |
1778 | phdr.p_flags |= PF_W; |
1779 | if (vma->vm_flags & VM_EXEC) |
1780 | phdr.p_flags |= PF_X; |
1781 | phdr.p_align = ELF_EXEC_PAGESIZE; |
1782 | |
1783 | DUMP_WRITE(&phdr, sizeof(phdr)); |
1784 | } |
1785 | |
1786 | #ifdef ELF_CORE_WRITE_EXTRA_PHDRS |
1787 | ELF_CORE_WRITE_EXTRA_PHDRS; |
1788 | #endif |
1789 | |
1790 | /* write out the notes section */ |
1791 | for (i = 0; i < numnote; i++) |
1792 | if (!writenote(notes + i, file)) |
1793 | goto end_coredump; |
1794 | |
1795 | /* write out the thread status notes section */ |
1796 | list_for_each(t, &thread_list) { |
1797 | struct elf_thread_status *tmp = |
1798 | list_entry(t, struct elf_thread_status, list); |
1799 | |
1800 | for (i = 0; i < tmp->num_notes; i++) |
1801 | if (!writenote(&tmp->notes[i], file)) |
1802 | goto end_coredump; |
1803 | } |
1804 | |
1805 | DUMP_SEEK(dataoff); |
1806 | |
1807 | if (elf_fdpic_dump_segments(file, &size, &limit, mm_flags) < 0) |
1808 | goto end_coredump; |
1809 | |
1810 | #ifdef ELF_CORE_WRITE_EXTRA_DATA |
1811 | ELF_CORE_WRITE_EXTRA_DATA; |
1812 | #endif |
1813 | |
1814 | if (file->f_pos != offset) { |
1815 | /* Sanity check */ |
1816 | printk(KERN_WARNING |
1817 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", |
1818 | file->f_pos, offset); |
1819 | } |
1820 | |
1821 | end_coredump: |
1822 | set_fs(fs); |
1823 | |
1824 | cleanup: |
1825 | while (!list_empty(&thread_list)) { |
1826 | struct list_head *tmp = thread_list.next; |
1827 | list_del(tmp); |
1828 | kfree(list_entry(tmp, struct elf_thread_status, list)); |
1829 | } |
1830 | |
1831 | kfree(elf); |
1832 | kfree(prstatus); |
1833 | kfree(psinfo); |
1834 | kfree(notes); |
1835 | kfree(fpu); |
1836 | #ifdef ELF_CORE_COPY_XFPREGS |
1837 | kfree(xfpu); |
1838 | #endif |
1839 | return has_dumped; |
1840 | #undef NUM_NOTES |
1841 | } |
1842 | |
1843 | #endif /* USE_ELF_CORE_DUMP */ |
1844 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9