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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 | #include <linux/coredump.h> |
38 | |
39 | #include <asm/uaccess.h> |
40 | #include <asm/param.h> |
41 | #include <asm/pgalloc.h> |
42 | |
43 | typedef char *elf_caddr_t; |
44 | |
45 | #if 0 |
46 | #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
47 | #else |
48 | #define kdebug(fmt, ...) do {} while(0) |
49 | #endif |
50 | |
51 | #if 0 |
52 | #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
53 | #else |
54 | #define kdcore(fmt, ...) do {} while(0) |
55 | #endif |
56 | |
57 | MODULE_LICENSE("GPL"); |
58 | |
59 | static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *); |
60 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); |
61 | static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, |
62 | struct mm_struct *, const char *); |
63 | |
64 | static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, |
65 | struct elf_fdpic_params *, |
66 | struct elf_fdpic_params *); |
67 | |
68 | #ifndef CONFIG_MMU |
69 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *, |
70 | unsigned long *); |
71 | static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *, |
72 | struct file *, |
73 | struct mm_struct *); |
74 | #endif |
75 | |
76 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, |
77 | struct file *, struct mm_struct *); |
78 | |
79 | #ifdef CONFIG_ELF_CORE |
80 | static int elf_fdpic_core_dump(struct coredump_params *cprm); |
81 | #endif |
82 | |
83 | static struct linux_binfmt elf_fdpic_format = { |
84 | .module = THIS_MODULE, |
85 | .load_binary = load_elf_fdpic_binary, |
86 | #ifdef CONFIG_ELF_CORE |
87 | .core_dump = elf_fdpic_core_dump, |
88 | #endif |
89 | .min_coredump = ELF_EXEC_PAGESIZE, |
90 | }; |
91 | |
92 | static int __init init_elf_fdpic_binfmt(void) |
93 | { |
94 | return register_binfmt(&elf_fdpic_format); |
95 | } |
96 | |
97 | static void __exit exit_elf_fdpic_binfmt(void) |
98 | { |
99 | unregister_binfmt(&elf_fdpic_format); |
100 | } |
101 | |
102 | core_initcall(init_elf_fdpic_binfmt); |
103 | module_exit(exit_elf_fdpic_binfmt); |
104 | |
105 | static int is_elf_fdpic(struct elfhdr *hdr, struct file *file) |
106 | { |
107 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) |
108 | return 0; |
109 | if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) |
110 | return 0; |
111 | if (!elf_check_arch(hdr) || !elf_check_fdpic(hdr)) |
112 | return 0; |
113 | if (!file->f_op || !file->f_op->mmap) |
114 | return 0; |
115 | return 1; |
116 | } |
117 | |
118 | /*****************************************************************************/ |
119 | /* |
120 | * read the program headers table into memory |
121 | */ |
122 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, |
123 | struct file *file) |
124 | { |
125 | struct elf32_phdr *phdr; |
126 | unsigned long size; |
127 | int retval, loop; |
128 | |
129 | if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) |
130 | return -ENOMEM; |
131 | if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) |
132 | return -ENOMEM; |
133 | |
134 | size = params->hdr.e_phnum * sizeof(struct elf_phdr); |
135 | params->phdrs = kmalloc(size, GFP_KERNEL); |
136 | if (!params->phdrs) |
137 | return -ENOMEM; |
138 | |
139 | retval = kernel_read(file, params->hdr.e_phoff, |
140 | (char *) params->phdrs, size); |
141 | if (unlikely(retval != size)) |
142 | return retval < 0 ? retval : -ENOEXEC; |
143 | |
144 | /* determine stack size for this binary */ |
145 | phdr = params->phdrs; |
146 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
147 | if (phdr->p_type != PT_GNU_STACK) |
148 | continue; |
149 | |
150 | if (phdr->p_flags & PF_X) |
151 | params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; |
152 | else |
153 | params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; |
154 | |
155 | params->stack_size = phdr->p_memsz; |
156 | break; |
157 | } |
158 | |
159 | return 0; |
160 | } |
161 | |
162 | /*****************************************************************************/ |
163 | /* |
164 | * load an fdpic binary into various bits of memory |
165 | */ |
166 | static int load_elf_fdpic_binary(struct linux_binprm *bprm, |
167 | struct pt_regs *regs) |
168 | { |
169 | struct elf_fdpic_params exec_params, interp_params; |
170 | struct elf_phdr *phdr; |
171 | unsigned long stack_size, entryaddr; |
172 | #ifdef ELF_FDPIC_PLAT_INIT |
173 | unsigned long dynaddr; |
174 | #endif |
175 | #ifndef CONFIG_MMU |
176 | unsigned long stack_prot; |
177 | #endif |
178 | struct file *interpreter = NULL; /* to shut gcc up */ |
179 | char *interpreter_name = NULL; |
180 | int executable_stack; |
181 | int retval, i; |
182 | |
183 | kdebug("____ LOAD %d ____", current->pid); |
184 | |
185 | memset(&exec_params, 0, sizeof(exec_params)); |
186 | memset(&interp_params, 0, sizeof(interp_params)); |
187 | |
188 | exec_params.hdr = *(struct elfhdr *) bprm->buf; |
189 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; |
190 | |
191 | /* check that this is a binary we know how to deal with */ |
192 | retval = -ENOEXEC; |
193 | if (!is_elf_fdpic(&exec_params.hdr, bprm->file)) |
194 | goto error; |
195 | |
196 | /* read the program header table */ |
197 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); |
198 | if (retval < 0) |
199 | goto error; |
200 | |
201 | /* scan for a program header that specifies an interpreter */ |
202 | phdr = exec_params.phdrs; |
203 | |
204 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { |
205 | switch (phdr->p_type) { |
206 | case PT_INTERP: |
207 | retval = -ENOMEM; |
208 | if (phdr->p_filesz > PATH_MAX) |
209 | goto error; |
210 | retval = -ENOENT; |
211 | if (phdr->p_filesz < 2) |
212 | goto error; |
213 | |
214 | /* read the name of the interpreter into memory */ |
215 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
216 | if (!interpreter_name) |
217 | goto error; |
218 | |
219 | retval = kernel_read(bprm->file, |
220 | phdr->p_offset, |
221 | interpreter_name, |
222 | phdr->p_filesz); |
223 | if (unlikely(retval != phdr->p_filesz)) { |
224 | if (retval >= 0) |
225 | retval = -ENOEXEC; |
226 | goto error; |
227 | } |
228 | |
229 | retval = -ENOENT; |
230 | if (interpreter_name[phdr->p_filesz - 1] != '\0') |
231 | goto error; |
232 | |
233 | kdebug("Using ELF interpreter %s", interpreter_name); |
234 | |
235 | /* replace the program with the interpreter */ |
236 | interpreter = open_exec(interpreter_name); |
237 | retval = PTR_ERR(interpreter); |
238 | if (IS_ERR(interpreter)) { |
239 | interpreter = NULL; |
240 | goto error; |
241 | } |
242 | |
243 | /* |
244 | * If the binary is not readable then enforce |
245 | * mm->dumpable = 0 regardless of the interpreter's |
246 | * permissions. |
247 | */ |
248 | if (file_permission(interpreter, MAY_READ) < 0) |
249 | bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; |
250 | |
251 | retval = kernel_read(interpreter, 0, bprm->buf, |
252 | BINPRM_BUF_SIZE); |
253 | if (unlikely(retval != BINPRM_BUF_SIZE)) { |
254 | if (retval >= 0) |
255 | retval = -ENOEXEC; |
256 | goto error; |
257 | } |
258 | |
259 | interp_params.hdr = *((struct elfhdr *) bprm->buf); |
260 | break; |
261 | |
262 | case PT_LOAD: |
263 | #ifdef CONFIG_MMU |
264 | if (exec_params.load_addr == 0) |
265 | exec_params.load_addr = phdr->p_vaddr; |
266 | #endif |
267 | break; |
268 | } |
269 | |
270 | } |
271 | |
272 | if (elf_check_const_displacement(&exec_params.hdr)) |
273 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
274 | |
275 | /* perform insanity checks on the interpreter */ |
276 | if (interpreter_name) { |
277 | retval = -ELIBBAD; |
278 | if (!is_elf_fdpic(&interp_params.hdr, interpreter)) |
279 | goto error; |
280 | |
281 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT; |
282 | |
283 | /* read the interpreter's program header table */ |
284 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); |
285 | if (retval < 0) |
286 | goto error; |
287 | } |
288 | |
289 | stack_size = exec_params.stack_size; |
290 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
291 | executable_stack = EXSTACK_ENABLE_X; |
292 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
293 | executable_stack = EXSTACK_DISABLE_X; |
294 | else |
295 | executable_stack = EXSTACK_DEFAULT; |
296 | |
297 | if (stack_size == 0) { |
298 | stack_size = interp_params.stack_size; |
299 | if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
300 | executable_stack = EXSTACK_ENABLE_X; |
301 | else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
302 | executable_stack = EXSTACK_DISABLE_X; |
303 | else |
304 | executable_stack = EXSTACK_DEFAULT; |
305 | } |
306 | |
307 | retval = -ENOEXEC; |
308 | if (stack_size == 0) |
309 | goto error; |
310 | |
311 | if (elf_check_const_displacement(&interp_params.hdr)) |
312 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
313 | |
314 | /* flush all traces of the currently running executable */ |
315 | retval = flush_old_exec(bprm); |
316 | if (retval) |
317 | goto error; |
318 | |
319 | /* there's now no turning back... the old userspace image is dead, |
320 | * defunct, deceased, etc. after this point we have to exit via |
321 | * error_kill */ |
322 | set_personality(PER_LINUX_FDPIC); |
323 | if (elf_read_implies_exec(&exec_params.hdr, executable_stack)) |
324 | current->personality |= READ_IMPLIES_EXEC; |
325 | |
326 | setup_new_exec(bprm); |
327 | |
328 | set_binfmt(&elf_fdpic_format); |
329 | |
330 | current->mm->start_code = 0; |
331 | current->mm->end_code = 0; |
332 | current->mm->start_stack = 0; |
333 | current->mm->start_data = 0; |
334 | current->mm->end_data = 0; |
335 | current->mm->context.exec_fdpic_loadmap = 0; |
336 | current->mm->context.interp_fdpic_loadmap = 0; |
337 | |
338 | current->flags &= ~PF_FORKNOEXEC; |
339 | |
340 | #ifdef CONFIG_MMU |
341 | elf_fdpic_arch_lay_out_mm(&exec_params, |
342 | &interp_params, |
343 | ¤t->mm->start_stack, |
344 | ¤t->mm->start_brk); |
345 | |
346 | retval = setup_arg_pages(bprm, current->mm->start_stack, |
347 | executable_stack); |
348 | if (retval < 0) { |
349 | send_sig(SIGKILL, current, 0); |
350 | goto error_kill; |
351 | } |
352 | #endif |
353 | |
354 | /* load the executable and interpreter into memory */ |
355 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
356 | "executable"); |
357 | if (retval < 0) |
358 | goto error_kill; |
359 | |
360 | if (interpreter_name) { |
361 | retval = elf_fdpic_map_file(&interp_params, interpreter, |
362 | current->mm, "interpreter"); |
363 | if (retval < 0) { |
364 | printk(KERN_ERR "Unable to load interpreter\n"); |
365 | goto error_kill; |
366 | } |
367 | |
368 | allow_write_access(interpreter); |
369 | fput(interpreter); |
370 | interpreter = NULL; |
371 | } |
372 | |
373 | #ifdef CONFIG_MMU |
374 | if (!current->mm->start_brk) |
375 | current->mm->start_brk = current->mm->end_data; |
376 | |
377 | current->mm->brk = current->mm->start_brk = |
378 | PAGE_ALIGN(current->mm->start_brk); |
379 | |
380 | #else |
381 | /* create a stack and brk area big enough for everyone |
382 | * - the brk heap starts at the bottom and works up |
383 | * - the stack starts at the top and works down |
384 | */ |
385 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; |
386 | if (stack_size < PAGE_SIZE * 2) |
387 | stack_size = PAGE_SIZE * 2; |
388 | |
389 | stack_prot = PROT_READ | PROT_WRITE; |
390 | if (executable_stack == EXSTACK_ENABLE_X || |
391 | (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC)) |
392 | stack_prot |= PROT_EXEC; |
393 | |
394 | down_write(¤t->mm->mmap_sem); |
395 | current->mm->start_brk = do_mmap(NULL, 0, stack_size, stack_prot, |
396 | MAP_PRIVATE | MAP_ANONYMOUS | |
397 | MAP_UNINITIALIZED | MAP_GROWSDOWN, |
398 | 0); |
399 | |
400 | if (IS_ERR_VALUE(current->mm->start_brk)) { |
401 | up_write(¤t->mm->mmap_sem); |
402 | retval = current->mm->start_brk; |
403 | current->mm->start_brk = 0; |
404 | goto error_kill; |
405 | } |
406 | |
407 | up_write(¤t->mm->mmap_sem); |
408 | |
409 | current->mm->brk = current->mm->start_brk; |
410 | current->mm->context.end_brk = current->mm->start_brk; |
411 | current->mm->context.end_brk += |
412 | (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0; |
413 | current->mm->start_stack = current->mm->start_brk + stack_size; |
414 | #endif |
415 | |
416 | install_exec_creds(bprm); |
417 | current->flags &= ~PF_FORKNOEXEC; |
418 | if (create_elf_fdpic_tables(bprm, current->mm, |
419 | &exec_params, &interp_params) < 0) |
420 | goto error_kill; |
421 | |
422 | kdebug("- start_code %lx", current->mm->start_code); |
423 | kdebug("- end_code %lx", current->mm->end_code); |
424 | kdebug("- start_data %lx", current->mm->start_data); |
425 | kdebug("- end_data %lx", current->mm->end_data); |
426 | kdebug("- start_brk %lx", current->mm->start_brk); |
427 | kdebug("- brk %lx", current->mm->brk); |
428 | kdebug("- start_stack %lx", current->mm->start_stack); |
429 | |
430 | #ifdef ELF_FDPIC_PLAT_INIT |
431 | /* |
432 | * The ABI may specify that certain registers be set up in special |
433 | * ways (on i386 %edx is the address of a DT_FINI function, for |
434 | * example. This macro performs whatever initialization to |
435 | * the regs structure is required. |
436 | */ |
437 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; |
438 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, |
439 | dynaddr); |
440 | #endif |
441 | |
442 | /* everything is now ready... get the userspace context ready to roll */ |
443 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
444 | start_thread(regs, entryaddr, current->mm->start_stack); |
445 | |
446 | retval = 0; |
447 | |
448 | error: |
449 | if (interpreter) { |
450 | allow_write_access(interpreter); |
451 | fput(interpreter); |
452 | } |
453 | kfree(interpreter_name); |
454 | kfree(exec_params.phdrs); |
455 | kfree(exec_params.loadmap); |
456 | kfree(interp_params.phdrs); |
457 | kfree(interp_params.loadmap); |
458 | return retval; |
459 | |
460 | /* unrecoverable error - kill the process */ |
461 | error_kill: |
462 | send_sig(SIGSEGV, current, 0); |
463 | goto error; |
464 | |
465 | } |
466 | |
467 | /*****************************************************************************/ |
468 | |
469 | #ifndef ELF_BASE_PLATFORM |
470 | /* |
471 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. |
472 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value |
473 | * will be copied to the user stack in the same manner as AT_PLATFORM. |
474 | */ |
475 | #define ELF_BASE_PLATFORM NULL |
476 | #endif |
477 | |
478 | /* |
479 | * present useful information to the program by shovelling it onto the new |
480 | * process's stack |
481 | */ |
482 | static int create_elf_fdpic_tables(struct linux_binprm *bprm, |
483 | struct mm_struct *mm, |
484 | struct elf_fdpic_params *exec_params, |
485 | struct elf_fdpic_params *interp_params) |
486 | { |
487 | const struct cred *cred = current_cred(); |
488 | unsigned long sp, csp, nitems; |
489 | elf_caddr_t __user *argv, *envp; |
490 | size_t platform_len = 0, len; |
491 | char *k_platform, *k_base_platform; |
492 | char __user *u_platform, *u_base_platform, *p; |
493 | long hwcap; |
494 | int loop; |
495 | int nr; /* reset for each csp adjustment */ |
496 | |
497 | #ifdef CONFIG_MMU |
498 | /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions |
499 | * by the processes running on the same package. One thing we can do is |
500 | * to shuffle the initial stack for them, so we give the architecture |
501 | * an opportunity to do so here. |
502 | */ |
503 | sp = arch_align_stack(bprm->p); |
504 | #else |
505 | sp = mm->start_stack; |
506 | |
507 | /* stack the program arguments and environment */ |
508 | if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0) |
509 | return -EFAULT; |
510 | #endif |
511 | |
512 | hwcap = ELF_HWCAP; |
513 | |
514 | /* |
515 | * If this architecture has a platform capability string, copy it |
516 | * to userspace. In some cases (Sparc), this info is impossible |
517 | * for userspace to get any other way, in others (i386) it is |
518 | * merely difficult. |
519 | */ |
520 | k_platform = ELF_PLATFORM; |
521 | u_platform = NULL; |
522 | |
523 | if (k_platform) { |
524 | platform_len = strlen(k_platform) + 1; |
525 | sp -= platform_len; |
526 | u_platform = (char __user *) sp; |
527 | if (__copy_to_user(u_platform, k_platform, platform_len) != 0) |
528 | return -EFAULT; |
529 | } |
530 | |
531 | /* |
532 | * If this architecture has a "base" platform capability |
533 | * string, copy it to userspace. |
534 | */ |
535 | k_base_platform = ELF_BASE_PLATFORM; |
536 | u_base_platform = NULL; |
537 | |
538 | if (k_base_platform) { |
539 | platform_len = strlen(k_base_platform) + 1; |
540 | sp -= platform_len; |
541 | u_base_platform = (char __user *) sp; |
542 | if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0) |
543 | return -EFAULT; |
544 | } |
545 | |
546 | sp &= ~7UL; |
547 | |
548 | /* stack the load map(s) */ |
549 | len = sizeof(struct elf32_fdpic_loadmap); |
550 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; |
551 | sp = (sp - len) & ~7UL; |
552 | exec_params->map_addr = sp; |
553 | |
554 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
555 | return -EFAULT; |
556 | |
557 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; |
558 | |
559 | if (interp_params->loadmap) { |
560 | len = sizeof(struct elf32_fdpic_loadmap); |
561 | len += sizeof(struct elf32_fdpic_loadseg) * |
562 | interp_params->loadmap->nsegs; |
563 | sp = (sp - len) & ~7UL; |
564 | interp_params->map_addr = sp; |
565 | |
566 | if (copy_to_user((void __user *) sp, interp_params->loadmap, |
567 | len) != 0) |
568 | return -EFAULT; |
569 | |
570 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; |
571 | } |
572 | |
573 | /* force 16 byte _final_ alignment here for generality */ |
574 | #define DLINFO_ITEMS 15 |
575 | |
576 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + |
577 | (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH; |
578 | |
579 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) |
580 | nitems++; |
581 | |
582 | csp = sp; |
583 | sp -= nitems * 2 * sizeof(unsigned long); |
584 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ |
585 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ |
586 | sp -= 1 * sizeof(unsigned long); /* argc */ |
587 | |
588 | csp -= sp & 15UL; |
589 | sp -= sp & 15UL; |
590 | |
591 | /* put the ELF interpreter info on the stack */ |
592 | #define NEW_AUX_ENT(id, val) \ |
593 | do { \ |
594 | struct { unsigned long _id, _val; } __user *ent; \ |
595 | \ |
596 | ent = (void __user *) csp; \ |
597 | __put_user((id), &ent[nr]._id); \ |
598 | __put_user((val), &ent[nr]._val); \ |
599 | nr++; \ |
600 | } while (0) |
601 | |
602 | nr = 0; |
603 | csp -= 2 * sizeof(unsigned long); |
604 | NEW_AUX_ENT(AT_NULL, 0); |
605 | if (k_platform) { |
606 | nr = 0; |
607 | csp -= 2 * sizeof(unsigned long); |
608 | NEW_AUX_ENT(AT_PLATFORM, |
609 | (elf_addr_t) (unsigned long) u_platform); |
610 | } |
611 | |
612 | if (k_base_platform) { |
613 | nr = 0; |
614 | csp -= 2 * sizeof(unsigned long); |
615 | NEW_AUX_ENT(AT_BASE_PLATFORM, |
616 | (elf_addr_t) (unsigned long) u_base_platform); |
617 | } |
618 | |
619 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
620 | nr = 0; |
621 | csp -= 2 * sizeof(unsigned long); |
622 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); |
623 | } |
624 | |
625 | nr = 0; |
626 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); |
627 | NEW_AUX_ENT(AT_HWCAP, hwcap); |
628 | NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE); |
629 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); |
630 | NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr); |
631 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
632 | NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum); |
633 | NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr); |
634 | NEW_AUX_ENT(AT_FLAGS, 0); |
635 | NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr); |
636 | NEW_AUX_ENT(AT_UID, (elf_addr_t) cred->uid); |
637 | NEW_AUX_ENT(AT_EUID, (elf_addr_t) cred->euid); |
638 | NEW_AUX_ENT(AT_GID, (elf_addr_t) cred->gid); |
639 | NEW_AUX_ENT(AT_EGID, (elf_addr_t) cred->egid); |
640 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
641 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
642 | |
643 | #ifdef ARCH_DLINFO |
644 | nr = 0; |
645 | csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long); |
646 | |
647 | /* ARCH_DLINFO must come last so platform specific code can enforce |
648 | * special alignment requirements on the AUXV if necessary (eg. PPC). |
649 | */ |
650 | ARCH_DLINFO; |
651 | #endif |
652 | #undef NEW_AUX_ENT |
653 | |
654 | /* allocate room for argv[] and envv[] */ |
655 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); |
656 | envp = (elf_caddr_t __user *) csp; |
657 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
658 | argv = (elf_caddr_t __user *) csp; |
659 | |
660 | /* stack argc */ |
661 | csp -= sizeof(unsigned long); |
662 | __put_user(bprm->argc, (unsigned long __user *) csp); |
663 | |
664 | BUG_ON(csp != sp); |
665 | |
666 | /* fill in the argv[] array */ |
667 | #ifdef CONFIG_MMU |
668 | current->mm->arg_start = bprm->p; |
669 | #else |
670 | current->mm->arg_start = current->mm->start_stack - |
671 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); |
672 | #endif |
673 | |
674 | p = (char __user *) current->mm->arg_start; |
675 | for (loop = bprm->argc; loop > 0; loop--) { |
676 | __put_user((elf_caddr_t) p, argv++); |
677 | len = strnlen_user(p, MAX_ARG_STRLEN); |
678 | if (!len || len > MAX_ARG_STRLEN) |
679 | return -EINVAL; |
680 | p += len; |
681 | } |
682 | __put_user(NULL, argv); |
683 | current->mm->arg_end = (unsigned long) p; |
684 | |
685 | /* fill in the envv[] array */ |
686 | current->mm->env_start = (unsigned long) p; |
687 | for (loop = bprm->envc; loop > 0; loop--) { |
688 | __put_user((elf_caddr_t)(unsigned long) p, envp++); |
689 | len = strnlen_user(p, MAX_ARG_STRLEN); |
690 | if (!len || len > MAX_ARG_STRLEN) |
691 | return -EINVAL; |
692 | p += len; |
693 | } |
694 | __put_user(NULL, envp); |
695 | current->mm->env_end = (unsigned long) p; |
696 | |
697 | mm->start_stack = (unsigned long) sp; |
698 | return 0; |
699 | } |
700 | |
701 | /*****************************************************************************/ |
702 | /* |
703 | * transfer the program arguments and environment from the holding pages onto |
704 | * the stack |
705 | */ |
706 | #ifndef CONFIG_MMU |
707 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm, |
708 | unsigned long *_sp) |
709 | { |
710 | unsigned long index, stop, sp; |
711 | char *src; |
712 | int ret = 0; |
713 | |
714 | stop = bprm->p >> PAGE_SHIFT; |
715 | sp = *_sp; |
716 | |
717 | for (index = MAX_ARG_PAGES - 1; index >= stop; index--) { |
718 | src = kmap(bprm->page[index]); |
719 | sp -= PAGE_SIZE; |
720 | if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0) |
721 | ret = -EFAULT; |
722 | kunmap(bprm->page[index]); |
723 | if (ret < 0) |
724 | goto out; |
725 | } |
726 | |
727 | *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15; |
728 | |
729 | out: |
730 | return ret; |
731 | } |
732 | #endif |
733 | |
734 | /*****************************************************************************/ |
735 | /* |
736 | * load the appropriate binary image (executable or interpreter) into memory |
737 | * - we assume no MMU is available |
738 | * - if no other PIC bits are set in params->hdr->e_flags |
739 | * - we assume that the LOADable segments in the binary are independently relocatable |
740 | * - we assume R/O executable segments are shareable |
741 | * - else |
742 | * - we assume the loadable parts of the image to require fixed displacement |
743 | * - the image is not shareable |
744 | */ |
745 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, |
746 | struct file *file, |
747 | struct mm_struct *mm, |
748 | const char *what) |
749 | { |
750 | struct elf32_fdpic_loadmap *loadmap; |
751 | #ifdef CONFIG_MMU |
752 | struct elf32_fdpic_loadseg *mseg; |
753 | #endif |
754 | struct elf32_fdpic_loadseg *seg; |
755 | struct elf32_phdr *phdr; |
756 | unsigned long load_addr, stop; |
757 | unsigned nloads, tmp; |
758 | size_t size; |
759 | int loop, ret; |
760 | |
761 | /* allocate a load map table */ |
762 | nloads = 0; |
763 | for (loop = 0; loop < params->hdr.e_phnum; loop++) |
764 | if (params->phdrs[loop].p_type == PT_LOAD) |
765 | nloads++; |
766 | |
767 | if (nloads == 0) |
768 | return -ELIBBAD; |
769 | |
770 | size = sizeof(*loadmap) + nloads * sizeof(*seg); |
771 | loadmap = kzalloc(size, GFP_KERNEL); |
772 | if (!loadmap) |
773 | return -ENOMEM; |
774 | |
775 | params->loadmap = loadmap; |
776 | |
777 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; |
778 | loadmap->nsegs = nloads; |
779 | |
780 | load_addr = params->load_addr; |
781 | seg = loadmap->segs; |
782 | |
783 | /* map the requested LOADs into the memory space */ |
784 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
785 | case ELF_FDPIC_FLAG_CONSTDISP: |
786 | case ELF_FDPIC_FLAG_CONTIGUOUS: |
787 | #ifndef CONFIG_MMU |
788 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); |
789 | if (ret < 0) |
790 | return ret; |
791 | break; |
792 | #endif |
793 | default: |
794 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); |
795 | if (ret < 0) |
796 | return ret; |
797 | break; |
798 | } |
799 | |
800 | /* map the entry point */ |
801 | if (params->hdr.e_entry) { |
802 | seg = loadmap->segs; |
803 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
804 | if (params->hdr.e_entry >= seg->p_vaddr && |
805 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
806 | params->entry_addr = |
807 | (params->hdr.e_entry - seg->p_vaddr) + |
808 | seg->addr; |
809 | break; |
810 | } |
811 | } |
812 | } |
813 | |
814 | /* determine where the program header table has wound up if mapped */ |
815 | stop = params->hdr.e_phoff; |
816 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); |
817 | phdr = params->phdrs; |
818 | |
819 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
820 | if (phdr->p_type != PT_LOAD) |
821 | continue; |
822 | |
823 | if (phdr->p_offset > params->hdr.e_phoff || |
824 | phdr->p_offset + phdr->p_filesz < stop) |
825 | continue; |
826 | |
827 | seg = loadmap->segs; |
828 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
829 | if (phdr->p_vaddr >= seg->p_vaddr && |
830 | phdr->p_vaddr + phdr->p_filesz <= |
831 | seg->p_vaddr + seg->p_memsz) { |
832 | params->ph_addr = |
833 | (phdr->p_vaddr - seg->p_vaddr) + |
834 | seg->addr + |
835 | params->hdr.e_phoff - phdr->p_offset; |
836 | break; |
837 | } |
838 | } |
839 | break; |
840 | } |
841 | |
842 | /* determine where the dynamic section has wound up if there is one */ |
843 | phdr = params->phdrs; |
844 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
845 | if (phdr->p_type != PT_DYNAMIC) |
846 | continue; |
847 | |
848 | seg = loadmap->segs; |
849 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
850 | if (phdr->p_vaddr >= seg->p_vaddr && |
851 | phdr->p_vaddr + phdr->p_memsz <= |
852 | seg->p_vaddr + seg->p_memsz) { |
853 | params->dynamic_addr = |
854 | (phdr->p_vaddr - seg->p_vaddr) + |
855 | seg->addr; |
856 | |
857 | /* check the dynamic section contains at least |
858 | * one item, and that the last item is a NULL |
859 | * entry */ |
860 | if (phdr->p_memsz == 0 || |
861 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) |
862 | goto dynamic_error; |
863 | |
864 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); |
865 | if (((Elf32_Dyn *) |
866 | params->dynamic_addr)[tmp - 1].d_tag != 0) |
867 | goto dynamic_error; |
868 | break; |
869 | } |
870 | } |
871 | break; |
872 | } |
873 | |
874 | /* now elide adjacent segments in the load map on MMU linux |
875 | * - on uClinux the holes between may actually be filled with system |
876 | * stuff or stuff from other processes |
877 | */ |
878 | #ifdef CONFIG_MMU |
879 | nloads = loadmap->nsegs; |
880 | mseg = loadmap->segs; |
881 | seg = mseg + 1; |
882 | for (loop = 1; loop < nloads; loop++) { |
883 | /* see if we have a candidate for merging */ |
884 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { |
885 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); |
886 | if (load_addr == (seg->addr & PAGE_MASK)) { |
887 | mseg->p_memsz += |
888 | load_addr - |
889 | (mseg->addr + mseg->p_memsz); |
890 | mseg->p_memsz += seg->addr & ~PAGE_MASK; |
891 | mseg->p_memsz += seg->p_memsz; |
892 | loadmap->nsegs--; |
893 | continue; |
894 | } |
895 | } |
896 | |
897 | mseg++; |
898 | if (mseg != seg) |
899 | *mseg = *seg; |
900 | } |
901 | #endif |
902 | |
903 | kdebug("Mapped Object [%s]:", what); |
904 | kdebug("- elfhdr : %lx", params->elfhdr_addr); |
905 | kdebug("- entry : %lx", params->entry_addr); |
906 | kdebug("- PHDR[] : %lx", params->ph_addr); |
907 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); |
908 | seg = loadmap->segs; |
909 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) |
910 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", |
911 | loop, |
912 | seg->addr, seg->addr + seg->p_memsz - 1, |
913 | seg->p_vaddr, seg->p_memsz); |
914 | |
915 | return 0; |
916 | |
917 | dynamic_error: |
918 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
919 | what, file->f_path.dentry->d_inode->i_ino); |
920 | return -ELIBBAD; |
921 | } |
922 | |
923 | /*****************************************************************************/ |
924 | /* |
925 | * map a file with constant displacement under uClinux |
926 | */ |
927 | #ifndef CONFIG_MMU |
928 | static int elf_fdpic_map_file_constdisp_on_uclinux( |
929 | struct elf_fdpic_params *params, |
930 | struct file *file, |
931 | struct mm_struct *mm) |
932 | { |
933 | struct elf32_fdpic_loadseg *seg; |
934 | struct elf32_phdr *phdr; |
935 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags; |
936 | loff_t fpos; |
937 | int loop, ret; |
938 | |
939 | load_addr = params->load_addr; |
940 | seg = params->loadmap->segs; |
941 | |
942 | /* determine the bounds of the contiguous overall allocation we must |
943 | * make */ |
944 | phdr = params->phdrs; |
945 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
946 | if (params->phdrs[loop].p_type != PT_LOAD) |
947 | continue; |
948 | |
949 | if (base > phdr->p_vaddr) |
950 | base = phdr->p_vaddr; |
951 | if (top < phdr->p_vaddr + phdr->p_memsz) |
952 | top = phdr->p_vaddr + phdr->p_memsz; |
953 | } |
954 | |
955 | /* allocate one big anon block for everything */ |
956 | mflags = MAP_PRIVATE; |
957 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) |
958 | mflags |= MAP_EXECUTABLE; |
959 | |
960 | down_write(&mm->mmap_sem); |
961 | maddr = do_mmap(NULL, load_addr, top - base, |
962 | PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); |
963 | up_write(&mm->mmap_sem); |
964 | if (IS_ERR_VALUE(maddr)) |
965 | return (int) maddr; |
966 | |
967 | if (load_addr != 0) |
968 | load_addr += PAGE_ALIGN(top - base); |
969 | |
970 | /* and then load the file segments into it */ |
971 | phdr = params->phdrs; |
972 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
973 | if (params->phdrs[loop].p_type != PT_LOAD) |
974 | continue; |
975 | |
976 | fpos = phdr->p_offset; |
977 | |
978 | seg->addr = maddr + (phdr->p_vaddr - base); |
979 | seg->p_vaddr = phdr->p_vaddr; |
980 | seg->p_memsz = phdr->p_memsz; |
981 | |
982 | ret = file->f_op->read(file, (void *) seg->addr, |
983 | phdr->p_filesz, &fpos); |
984 | if (ret < 0) |
985 | return ret; |
986 | |
987 | /* map the ELF header address if in this segment */ |
988 | if (phdr->p_offset == 0) |
989 | params->elfhdr_addr = seg->addr; |
990 | |
991 | /* clear any space allocated but not loaded */ |
992 | if (phdr->p_filesz < phdr->p_memsz) { |
993 | if (clear_user((void *) (seg->addr + phdr->p_filesz), |
994 | phdr->p_memsz - phdr->p_filesz)) |
995 | return -EFAULT; |
996 | } |
997 | |
998 | if (mm) { |
999 | if (phdr->p_flags & PF_X) { |
1000 | if (!mm->start_code) { |
1001 | mm->start_code = seg->addr; |
1002 | mm->end_code = seg->addr + |
1003 | phdr->p_memsz; |
1004 | } |
1005 | } else if (!mm->start_data) { |
1006 | mm->start_data = seg->addr; |
1007 | mm->end_data = seg->addr + phdr->p_memsz; |
1008 | } |
1009 | } |
1010 | |
1011 | seg++; |
1012 | } |
1013 | |
1014 | return 0; |
1015 | } |
1016 | #endif |
1017 | |
1018 | /*****************************************************************************/ |
1019 | /* |
1020 | * map a binary by direct mmap() of the individual PT_LOAD segments |
1021 | */ |
1022 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, |
1023 | struct file *file, |
1024 | struct mm_struct *mm) |
1025 | { |
1026 | struct elf32_fdpic_loadseg *seg; |
1027 | struct elf32_phdr *phdr; |
1028 | unsigned long load_addr, delta_vaddr; |
1029 | int loop, dvset; |
1030 | |
1031 | load_addr = params->load_addr; |
1032 | delta_vaddr = 0; |
1033 | dvset = 0; |
1034 | |
1035 | seg = params->loadmap->segs; |
1036 | |
1037 | /* deal with each load segment separately */ |
1038 | phdr = params->phdrs; |
1039 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
1040 | unsigned long maddr, disp, excess, excess1; |
1041 | int prot = 0, flags; |
1042 | |
1043 | if (phdr->p_type != PT_LOAD) |
1044 | continue; |
1045 | |
1046 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", |
1047 | (unsigned long) phdr->p_vaddr, |
1048 | (unsigned long) phdr->p_offset, |
1049 | (unsigned long) phdr->p_filesz, |
1050 | (unsigned long) phdr->p_memsz); |
1051 | |
1052 | /* determine the mapping parameters */ |
1053 | if (phdr->p_flags & PF_R) prot |= PROT_READ; |
1054 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; |
1055 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; |
1056 | |
1057 | flags = MAP_PRIVATE | MAP_DENYWRITE; |
1058 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) |
1059 | flags |= MAP_EXECUTABLE; |
1060 | |
1061 | maddr = 0; |
1062 | |
1063 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
1064 | case ELF_FDPIC_FLAG_INDEPENDENT: |
1065 | /* PT_LOADs are independently locatable */ |
1066 | break; |
1067 | |
1068 | case ELF_FDPIC_FLAG_HONOURVADDR: |
1069 | /* the specified virtual address must be honoured */ |
1070 | maddr = phdr->p_vaddr; |
1071 | flags |= MAP_FIXED; |
1072 | break; |
1073 | |
1074 | case ELF_FDPIC_FLAG_CONSTDISP: |
1075 | /* constant displacement |
1076 | * - can be mapped anywhere, but must be mapped as a |
1077 | * unit |
1078 | */ |
1079 | if (!dvset) { |
1080 | maddr = load_addr; |
1081 | delta_vaddr = phdr->p_vaddr; |
1082 | dvset = 1; |
1083 | } else { |
1084 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
1085 | flags |= MAP_FIXED; |
1086 | } |
1087 | break; |
1088 | |
1089 | case ELF_FDPIC_FLAG_CONTIGUOUS: |
1090 | /* contiguity handled later */ |
1091 | break; |
1092 | |
1093 | default: |
1094 | BUG(); |
1095 | } |
1096 | |
1097 | maddr &= PAGE_MASK; |
1098 | |
1099 | /* create the mapping */ |
1100 | disp = phdr->p_vaddr & ~PAGE_MASK; |
1101 | down_write(&mm->mmap_sem); |
1102 | maddr = do_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, |
1103 | phdr->p_offset - disp); |
1104 | up_write(&mm->mmap_sem); |
1105 | |
1106 | kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", |
1107 | loop, phdr->p_memsz + disp, prot, flags, |
1108 | phdr->p_offset - disp, maddr); |
1109 | |
1110 | if (IS_ERR_VALUE(maddr)) |
1111 | return (int) maddr; |
1112 | |
1113 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
1114 | ELF_FDPIC_FLAG_CONTIGUOUS) |
1115 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
1116 | |
1117 | seg->addr = maddr + disp; |
1118 | seg->p_vaddr = phdr->p_vaddr; |
1119 | seg->p_memsz = phdr->p_memsz; |
1120 | |
1121 | /* map the ELF header address if in this segment */ |
1122 | if (phdr->p_offset == 0) |
1123 | params->elfhdr_addr = seg->addr; |
1124 | |
1125 | /* clear the bit between beginning of mapping and beginning of |
1126 | * PT_LOAD */ |
1127 | if (prot & PROT_WRITE && disp > 0) { |
1128 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); |
1129 | if (clear_user((void __user *) maddr, disp)) |
1130 | return -EFAULT; |
1131 | maddr += disp; |
1132 | } |
1133 | |
1134 | /* clear any space allocated but not loaded |
1135 | * - on uClinux we can just clear the lot |
1136 | * - on MMU linux we'll get a SIGBUS beyond the last page |
1137 | * extant in the file |
1138 | */ |
1139 | excess = phdr->p_memsz - phdr->p_filesz; |
1140 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); |
1141 | |
1142 | #ifdef CONFIG_MMU |
1143 | if (excess > excess1) { |
1144 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; |
1145 | unsigned long xmaddr; |
1146 | |
1147 | flags |= MAP_FIXED | MAP_ANONYMOUS; |
1148 | down_write(&mm->mmap_sem); |
1149 | xmaddr = do_mmap(NULL, xaddr, excess - excess1, |
1150 | prot, flags, 0); |
1151 | up_write(&mm->mmap_sem); |
1152 | |
1153 | kdebug("mmap[%d] <anon>" |
1154 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", |
1155 | loop, xaddr, excess - excess1, prot, flags, |
1156 | xmaddr); |
1157 | |
1158 | if (xmaddr != xaddr) |
1159 | return -ENOMEM; |
1160 | } |
1161 | |
1162 | if (prot & PROT_WRITE && excess1 > 0) { |
1163 | kdebug("clear[%d] ad=%lx sz=%lx", |
1164 | loop, maddr + phdr->p_filesz, excess1); |
1165 | if (clear_user((void __user *) maddr + phdr->p_filesz, |
1166 | excess1)) |
1167 | return -EFAULT; |
1168 | } |
1169 | |
1170 | #else |
1171 | if (excess > 0) { |
1172 | kdebug("clear[%d] ad=%lx sz=%lx", |
1173 | loop, maddr + phdr->p_filesz, excess); |
1174 | if (clear_user((void *) maddr + phdr->p_filesz, excess)) |
1175 | return -EFAULT; |
1176 | } |
1177 | #endif |
1178 | |
1179 | if (mm) { |
1180 | if (phdr->p_flags & PF_X) { |
1181 | if (!mm->start_code) { |
1182 | mm->start_code = maddr; |
1183 | mm->end_code = maddr + phdr->p_memsz; |
1184 | } |
1185 | } else if (!mm->start_data) { |
1186 | mm->start_data = maddr; |
1187 | mm->end_data = maddr + phdr->p_memsz; |
1188 | } |
1189 | } |
1190 | |
1191 | seg++; |
1192 | } |
1193 | |
1194 | return 0; |
1195 | } |
1196 | |
1197 | /*****************************************************************************/ |
1198 | /* |
1199 | * ELF-FDPIC core dumper |
1200 | * |
1201 | * Modelled on fs/exec.c:aout_core_dump() |
1202 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> |
1203 | * |
1204 | * Modelled on fs/binfmt_elf.c core dumper |
1205 | */ |
1206 | #ifdef CONFIG_ELF_CORE |
1207 | |
1208 | /* |
1209 | * Decide whether a segment is worth dumping; default is yes to be |
1210 | * sure (missing info is worse than too much; etc). |
1211 | * Personally I'd include everything, and use the coredump limit... |
1212 | * |
1213 | * I think we should skip something. But I am not sure how. H.J. |
1214 | */ |
1215 | static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) |
1216 | { |
1217 | int dump_ok; |
1218 | |
1219 | /* Do not dump I/O mapped devices or special mappings */ |
1220 | if (vma->vm_flags & (VM_IO | VM_RESERVED)) { |
1221 | kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags); |
1222 | return 0; |
1223 | } |
1224 | |
1225 | /* If we may not read the contents, don't allow us to dump |
1226 | * them either. "dump_write()" can't handle it anyway. |
1227 | */ |
1228 | if (!(vma->vm_flags & VM_READ)) { |
1229 | kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags); |
1230 | return 0; |
1231 | } |
1232 | |
1233 | /* By default, dump shared memory if mapped from an anonymous file. */ |
1234 | if (vma->vm_flags & VM_SHARED) { |
1235 | if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0) { |
1236 | dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags); |
1237 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, |
1238 | vma->vm_flags, dump_ok ? "yes" : "no"); |
1239 | return dump_ok; |
1240 | } |
1241 | |
1242 | dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags); |
1243 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, |
1244 | vma->vm_flags, dump_ok ? "yes" : "no"); |
1245 | return dump_ok; |
1246 | } |
1247 | |
1248 | #ifdef CONFIG_MMU |
1249 | /* By default, if it hasn't been written to, don't write it out */ |
1250 | if (!vma->anon_vma) { |
1251 | dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags); |
1252 | kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start, |
1253 | vma->vm_flags, dump_ok ? "yes" : "no"); |
1254 | return dump_ok; |
1255 | } |
1256 | #endif |
1257 | |
1258 | dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags); |
1259 | kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags, |
1260 | dump_ok ? "yes" : "no"); |
1261 | return dump_ok; |
1262 | } |
1263 | |
1264 | /* An ELF note in memory */ |
1265 | struct memelfnote |
1266 | { |
1267 | const char *name; |
1268 | int type; |
1269 | unsigned int datasz; |
1270 | void *data; |
1271 | }; |
1272 | |
1273 | static int notesize(struct memelfnote *en) |
1274 | { |
1275 | int sz; |
1276 | |
1277 | sz = sizeof(struct elf_note); |
1278 | sz += roundup(strlen(en->name) + 1, 4); |
1279 | sz += roundup(en->datasz, 4); |
1280 | |
1281 | return sz; |
1282 | } |
1283 | |
1284 | /* #define DEBUG */ |
1285 | |
1286 | #define DUMP_WRITE(addr, nr, foffset) \ |
1287 | do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0) |
1288 | |
1289 | static int alignfile(struct file *file, loff_t *foffset) |
1290 | { |
1291 | static const char buf[4] = { 0, }; |
1292 | DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset); |
1293 | return 1; |
1294 | } |
1295 | |
1296 | static int writenote(struct memelfnote *men, struct file *file, |
1297 | loff_t *foffset) |
1298 | { |
1299 | struct elf_note en; |
1300 | en.n_namesz = strlen(men->name) + 1; |
1301 | en.n_descsz = men->datasz; |
1302 | en.n_type = men->type; |
1303 | |
1304 | DUMP_WRITE(&en, sizeof(en), foffset); |
1305 | DUMP_WRITE(men->name, en.n_namesz, foffset); |
1306 | if (!alignfile(file, foffset)) |
1307 | return 0; |
1308 | DUMP_WRITE(men->data, men->datasz, foffset); |
1309 | if (!alignfile(file, foffset)) |
1310 | return 0; |
1311 | |
1312 | return 1; |
1313 | } |
1314 | #undef DUMP_WRITE |
1315 | |
1316 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) |
1317 | { |
1318 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
1319 | elf->e_ident[EI_CLASS] = ELF_CLASS; |
1320 | elf->e_ident[EI_DATA] = ELF_DATA; |
1321 | elf->e_ident[EI_VERSION] = EV_CURRENT; |
1322 | elf->e_ident[EI_OSABI] = ELF_OSABI; |
1323 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); |
1324 | |
1325 | elf->e_type = ET_CORE; |
1326 | elf->e_machine = ELF_ARCH; |
1327 | elf->e_version = EV_CURRENT; |
1328 | elf->e_entry = 0; |
1329 | elf->e_phoff = sizeof(struct elfhdr); |
1330 | elf->e_shoff = 0; |
1331 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS; |
1332 | elf->e_ehsize = sizeof(struct elfhdr); |
1333 | elf->e_phentsize = sizeof(struct elf_phdr); |
1334 | elf->e_phnum = segs; |
1335 | elf->e_shentsize = 0; |
1336 | elf->e_shnum = 0; |
1337 | elf->e_shstrndx = 0; |
1338 | return; |
1339 | } |
1340 | |
1341 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1342 | { |
1343 | phdr->p_type = PT_NOTE; |
1344 | phdr->p_offset = offset; |
1345 | phdr->p_vaddr = 0; |
1346 | phdr->p_paddr = 0; |
1347 | phdr->p_filesz = sz; |
1348 | phdr->p_memsz = 0; |
1349 | phdr->p_flags = 0; |
1350 | phdr->p_align = 0; |
1351 | return; |
1352 | } |
1353 | |
1354 | static inline void fill_note(struct memelfnote *note, const char *name, int type, |
1355 | unsigned int sz, void *data) |
1356 | { |
1357 | note->name = name; |
1358 | note->type = type; |
1359 | note->datasz = sz; |
1360 | note->data = data; |
1361 | return; |
1362 | } |
1363 | |
1364 | /* |
1365 | * fill up all the fields in prstatus from the given task struct, except |
1366 | * registers which need to be filled up separately. |
1367 | */ |
1368 | static void fill_prstatus(struct elf_prstatus *prstatus, |
1369 | struct task_struct *p, long signr) |
1370 | { |
1371 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; |
1372 | prstatus->pr_sigpend = p->pending.signal.sig[0]; |
1373 | prstatus->pr_sighold = p->blocked.sig[0]; |
1374 | rcu_read_lock(); |
1375 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); |
1376 | rcu_read_unlock(); |
1377 | prstatus->pr_pid = task_pid_vnr(p); |
1378 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1379 | prstatus->pr_sid = task_session_vnr(p); |
1380 | if (thread_group_leader(p)) { |
1381 | struct task_cputime cputime; |
1382 | |
1383 | /* |
1384 | * This is the record for the group leader. It shows the |
1385 | * group-wide total, not its individual thread total. |
1386 | */ |
1387 | thread_group_cputime(p, &cputime); |
1388 | cputime_to_timeval(cputime.utime, &prstatus->pr_utime); |
1389 | cputime_to_timeval(cputime.stime, &prstatus->pr_stime); |
1390 | } else { |
1391 | cputime_to_timeval(p->utime, &prstatus->pr_utime); |
1392 | cputime_to_timeval(p->stime, &prstatus->pr_stime); |
1393 | } |
1394 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); |
1395 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); |
1396 | |
1397 | prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; |
1398 | prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; |
1399 | } |
1400 | |
1401 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, |
1402 | struct mm_struct *mm) |
1403 | { |
1404 | const struct cred *cred; |
1405 | unsigned int i, len; |
1406 | |
1407 | /* first copy the parameters from user space */ |
1408 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); |
1409 | |
1410 | len = mm->arg_end - mm->arg_start; |
1411 | if (len >= ELF_PRARGSZ) |
1412 | len = ELF_PRARGSZ - 1; |
1413 | if (copy_from_user(&psinfo->pr_psargs, |
1414 | (const char __user *) mm->arg_start, len)) |
1415 | return -EFAULT; |
1416 | for (i = 0; i < len; i++) |
1417 | if (psinfo->pr_psargs[i] == 0) |
1418 | psinfo->pr_psargs[i] = ' '; |
1419 | psinfo->pr_psargs[len] = 0; |
1420 | |
1421 | rcu_read_lock(); |
1422 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); |
1423 | rcu_read_unlock(); |
1424 | psinfo->pr_pid = task_pid_vnr(p); |
1425 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1426 | psinfo->pr_sid = task_session_vnr(p); |
1427 | |
1428 | i = p->state ? ffz(~p->state) + 1 : 0; |
1429 | psinfo->pr_state = i; |
1430 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1431 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
1432 | psinfo->pr_nice = task_nice(p); |
1433 | psinfo->pr_flag = p->flags; |
1434 | rcu_read_lock(); |
1435 | cred = __task_cred(p); |
1436 | SET_UID(psinfo->pr_uid, cred->uid); |
1437 | SET_GID(psinfo->pr_gid, cred->gid); |
1438 | rcu_read_unlock(); |
1439 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1440 | |
1441 | return 0; |
1442 | } |
1443 | |
1444 | /* Here is the structure in which status of each thread is captured. */ |
1445 | struct elf_thread_status |
1446 | { |
1447 | struct list_head list; |
1448 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ |
1449 | elf_fpregset_t fpu; /* NT_PRFPREG */ |
1450 | struct task_struct *thread; |
1451 | #ifdef ELF_CORE_COPY_XFPREGS |
1452 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
1453 | #endif |
1454 | struct memelfnote notes[3]; |
1455 | int num_notes; |
1456 | }; |
1457 | |
1458 | /* |
1459 | * In order to add the specific thread information for the elf file format, |
1460 | * we need to keep a linked list of every thread's pr_status and then create |
1461 | * a single section for them in the final core file. |
1462 | */ |
1463 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) |
1464 | { |
1465 | struct task_struct *p = t->thread; |
1466 | int sz = 0; |
1467 | |
1468 | t->num_notes = 0; |
1469 | |
1470 | fill_prstatus(&t->prstatus, p, signr); |
1471 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); |
1472 | |
1473 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
1474 | &t->prstatus); |
1475 | t->num_notes++; |
1476 | sz += notesize(&t->notes[0]); |
1477 | |
1478 | t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu); |
1479 | if (t->prstatus.pr_fpvalid) { |
1480 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), |
1481 | &t->fpu); |
1482 | t->num_notes++; |
1483 | sz += notesize(&t->notes[1]); |
1484 | } |
1485 | |
1486 | #ifdef ELF_CORE_COPY_XFPREGS |
1487 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { |
1488 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1489 | sizeof(t->xfpu), &t->xfpu); |
1490 | t->num_notes++; |
1491 | sz += notesize(&t->notes[2]); |
1492 | } |
1493 | #endif |
1494 | return sz; |
1495 | } |
1496 | |
1497 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
1498 | elf_addr_t e_shoff, int segs) |
1499 | { |
1500 | elf->e_shoff = e_shoff; |
1501 | elf->e_shentsize = sizeof(*shdr4extnum); |
1502 | elf->e_shnum = 1; |
1503 | elf->e_shstrndx = SHN_UNDEF; |
1504 | |
1505 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); |
1506 | |
1507 | shdr4extnum->sh_type = SHT_NULL; |
1508 | shdr4extnum->sh_size = elf->e_shnum; |
1509 | shdr4extnum->sh_link = elf->e_shstrndx; |
1510 | shdr4extnum->sh_info = segs; |
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 | int err = 0; |
1522 | |
1523 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
1524 | unsigned long addr; |
1525 | |
1526 | if (!maydump(vma, mm_flags)) |
1527 | continue; |
1528 | |
1529 | for (addr = vma->vm_start; addr < vma->vm_end; |
1530 | addr += PAGE_SIZE) { |
1531 | struct page *page = get_dump_page(addr); |
1532 | if (page) { |
1533 | void *kaddr = kmap(page); |
1534 | *size += PAGE_SIZE; |
1535 | if (*size > *limit) |
1536 | err = -EFBIG; |
1537 | else if (!dump_write(file, kaddr, PAGE_SIZE)) |
1538 | err = -EIO; |
1539 | kunmap(page); |
1540 | page_cache_release(page); |
1541 | } else if (!dump_seek(file, PAGE_SIZE)) |
1542 | err = -EFBIG; |
1543 | if (err) |
1544 | goto out; |
1545 | } |
1546 | } |
1547 | out: |
1548 | return err; |
1549 | } |
1550 | #endif |
1551 | |
1552 | /* |
1553 | * dump the segments for a NOMMU process |
1554 | */ |
1555 | #ifndef CONFIG_MMU |
1556 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
1557 | unsigned long *limit, unsigned long mm_flags) |
1558 | { |
1559 | struct vm_area_struct *vma; |
1560 | |
1561 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
1562 | if (!maydump(vma, mm_flags)) |
1563 | continue; |
1564 | |
1565 | if ((*size += PAGE_SIZE) > *limit) |
1566 | return -EFBIG; |
1567 | |
1568 | if (!dump_write(file, (void *) vma->vm_start, |
1569 | vma->vm_end - vma->vm_start)) |
1570 | return -EIO; |
1571 | } |
1572 | |
1573 | return 0; |
1574 | } |
1575 | #endif |
1576 | |
1577 | static size_t elf_core_vma_data_size(unsigned long mm_flags) |
1578 | { |
1579 | struct vm_area_struct *vma; |
1580 | size_t size = 0; |
1581 | |
1582 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) |
1583 | if (maydump(vma, mm_flags)) |
1584 | size += vma->vm_end - vma->vm_start; |
1585 | return size; |
1586 | } |
1587 | |
1588 | /* |
1589 | * Actual dumper |
1590 | * |
1591 | * This is a two-pass process; first we find the offsets of the bits, |
1592 | * and then they are actually written out. If we run out of core limit |
1593 | * we just truncate. |
1594 | */ |
1595 | static int elf_fdpic_core_dump(struct coredump_params *cprm) |
1596 | { |
1597 | #define NUM_NOTES 6 |
1598 | int has_dumped = 0; |
1599 | mm_segment_t fs; |
1600 | int segs; |
1601 | size_t size = 0; |
1602 | int i; |
1603 | struct vm_area_struct *vma; |
1604 | struct elfhdr *elf = NULL; |
1605 | loff_t offset = 0, dataoff, foffset; |
1606 | int numnote; |
1607 | struct memelfnote *notes = NULL; |
1608 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ |
1609 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ |
1610 | LIST_HEAD(thread_list); |
1611 | struct list_head *t; |
1612 | elf_fpregset_t *fpu = NULL; |
1613 | #ifdef ELF_CORE_COPY_XFPREGS |
1614 | elf_fpxregset_t *xfpu = NULL; |
1615 | #endif |
1616 | int thread_status_size = 0; |
1617 | elf_addr_t *auxv; |
1618 | struct elf_phdr *phdr4note = NULL; |
1619 | struct elf_shdr *shdr4extnum = NULL; |
1620 | Elf_Half e_phnum; |
1621 | elf_addr_t e_shoff; |
1622 | |
1623 | /* |
1624 | * We no longer stop all VM operations. |
1625 | * |
1626 | * This is because those proceses that could possibly change map_count |
1627 | * or the mmap / vma pages are now blocked in do_exit on current |
1628 | * finishing this core dump. |
1629 | * |
1630 | * Only ptrace can touch these memory addresses, but it doesn't change |
1631 | * the map_count or the pages allocated. So no possibility of crashing |
1632 | * exists while dumping the mm->vm_next areas to the core file. |
1633 | */ |
1634 | |
1635 | /* alloc memory for large data structures: too large to be on stack */ |
1636 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); |
1637 | if (!elf) |
1638 | goto cleanup; |
1639 | prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL); |
1640 | if (!prstatus) |
1641 | goto cleanup; |
1642 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); |
1643 | if (!psinfo) |
1644 | goto cleanup; |
1645 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); |
1646 | if (!notes) |
1647 | goto cleanup; |
1648 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); |
1649 | if (!fpu) |
1650 | goto cleanup; |
1651 | #ifdef ELF_CORE_COPY_XFPREGS |
1652 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); |
1653 | if (!xfpu) |
1654 | goto cleanup; |
1655 | #endif |
1656 | |
1657 | if (cprm->signr) { |
1658 | struct core_thread *ct; |
1659 | struct elf_thread_status *tmp; |
1660 | |
1661 | for (ct = current->mm->core_state->dumper.next; |
1662 | ct; ct = ct->next) { |
1663 | tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); |
1664 | if (!tmp) |
1665 | goto cleanup; |
1666 | |
1667 | tmp->thread = ct->task; |
1668 | list_add(&tmp->list, &thread_list); |
1669 | } |
1670 | |
1671 | list_for_each(t, &thread_list) { |
1672 | struct elf_thread_status *tmp; |
1673 | int sz; |
1674 | |
1675 | tmp = list_entry(t, struct elf_thread_status, list); |
1676 | sz = elf_dump_thread_status(cprm->signr, tmp); |
1677 | thread_status_size += sz; |
1678 | } |
1679 | } |
1680 | |
1681 | /* now collect the dump for the current */ |
1682 | fill_prstatus(prstatus, current, cprm->signr); |
1683 | elf_core_copy_regs(&prstatus->pr_reg, cprm->regs); |
1684 | |
1685 | segs = current->mm->map_count; |
1686 | segs += elf_core_extra_phdrs(); |
1687 | |
1688 | /* for notes section */ |
1689 | segs++; |
1690 | |
1691 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid |
1692 | * this, kernel supports extended numbering. Have a look at |
1693 | * include/linux/elf.h for further information. */ |
1694 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; |
1695 | |
1696 | /* Set up header */ |
1697 | fill_elf_fdpic_header(elf, e_phnum); |
1698 | |
1699 | has_dumped = 1; |
1700 | current->flags |= PF_DUMPCORE; |
1701 | |
1702 | /* |
1703 | * Set up the notes in similar form to SVR4 core dumps made |
1704 | * with info from their /proc. |
1705 | */ |
1706 | |
1707 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); |
1708 | fill_psinfo(psinfo, current->group_leader, current->mm); |
1709 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
1710 | |
1711 | numnote = 2; |
1712 | |
1713 | auxv = (elf_addr_t *) current->mm->saved_auxv; |
1714 | |
1715 | i = 0; |
1716 | do |
1717 | i += 2; |
1718 | while (auxv[i - 2] != AT_NULL); |
1719 | fill_note(¬es[numnote++], "CORE", NT_AUXV, |
1720 | i * sizeof(elf_addr_t), auxv); |
1721 | |
1722 | /* Try to dump the FPU. */ |
1723 | if ((prstatus->pr_fpvalid = |
1724 | elf_core_copy_task_fpregs(current, cprm->regs, fpu))) |
1725 | fill_note(notes + numnote++, |
1726 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); |
1727 | #ifdef ELF_CORE_COPY_XFPREGS |
1728 | if (elf_core_copy_task_xfpregs(current, xfpu)) |
1729 | fill_note(notes + numnote++, |
1730 | "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu); |
1731 | #endif |
1732 | |
1733 | fs = get_fs(); |
1734 | set_fs(KERNEL_DS); |
1735 | |
1736 | offset += sizeof(*elf); /* Elf header */ |
1737 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
1738 | foffset = offset; |
1739 | |
1740 | /* Write notes phdr entry */ |
1741 | { |
1742 | int sz = 0; |
1743 | |
1744 | for (i = 0; i < numnote; i++) |
1745 | sz += notesize(notes + i); |
1746 | |
1747 | sz += thread_status_size; |
1748 | |
1749 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
1750 | if (!phdr4note) |
1751 | goto end_coredump; |
1752 | |
1753 | fill_elf_note_phdr(phdr4note, sz, offset); |
1754 | offset += sz; |
1755 | } |
1756 | |
1757 | /* Page-align dumped data */ |
1758 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
1759 | |
1760 | offset += elf_core_vma_data_size(cprm->mm_flags); |
1761 | offset += elf_core_extra_data_size(); |
1762 | e_shoff = offset; |
1763 | |
1764 | if (e_phnum == PN_XNUM) { |
1765 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); |
1766 | if (!shdr4extnum) |
1767 | goto end_coredump; |
1768 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs); |
1769 | } |
1770 | |
1771 | offset = dataoff; |
1772 | |
1773 | size += sizeof(*elf); |
1774 | if (size > cprm->limit || !dump_write(cprm->file, elf, sizeof(*elf))) |
1775 | goto end_coredump; |
1776 | |
1777 | size += sizeof(*phdr4note); |
1778 | if (size > cprm->limit |
1779 | || !dump_write(cprm->file, phdr4note, sizeof(*phdr4note))) |
1780 | goto end_coredump; |
1781 | |
1782 | /* write program headers for segments dump */ |
1783 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
1784 | struct elf_phdr phdr; |
1785 | size_t sz; |
1786 | |
1787 | sz = vma->vm_end - vma->vm_start; |
1788 | |
1789 | phdr.p_type = PT_LOAD; |
1790 | phdr.p_offset = offset; |
1791 | phdr.p_vaddr = vma->vm_start; |
1792 | phdr.p_paddr = 0; |
1793 | phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0; |
1794 | phdr.p_memsz = sz; |
1795 | offset += phdr.p_filesz; |
1796 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; |
1797 | if (vma->vm_flags & VM_WRITE) |
1798 | phdr.p_flags |= PF_W; |
1799 | if (vma->vm_flags & VM_EXEC) |
1800 | phdr.p_flags |= PF_X; |
1801 | phdr.p_align = ELF_EXEC_PAGESIZE; |
1802 | |
1803 | size += sizeof(phdr); |
1804 | if (size > cprm->limit |
1805 | || !dump_write(cprm->file, &phdr, sizeof(phdr))) |
1806 | goto end_coredump; |
1807 | } |
1808 | |
1809 | if (!elf_core_write_extra_phdrs(cprm->file, offset, &size, cprm->limit)) |
1810 | goto end_coredump; |
1811 | |
1812 | /* write out the notes section */ |
1813 | for (i = 0; i < numnote; i++) |
1814 | if (!writenote(notes + i, cprm->file, &foffset)) |
1815 | goto end_coredump; |
1816 | |
1817 | /* write out the thread status notes section */ |
1818 | list_for_each(t, &thread_list) { |
1819 | struct elf_thread_status *tmp = |
1820 | list_entry(t, struct elf_thread_status, list); |
1821 | |
1822 | for (i = 0; i < tmp->num_notes; i++) |
1823 | if (!writenote(&tmp->notes[i], cprm->file, &foffset)) |
1824 | goto end_coredump; |
1825 | } |
1826 | |
1827 | if (!dump_seek(cprm->file, dataoff - foffset)) |
1828 | goto end_coredump; |
1829 | |
1830 | if (elf_fdpic_dump_segments(cprm->file, &size, &cprm->limit, |
1831 | cprm->mm_flags) < 0) |
1832 | goto end_coredump; |
1833 | |
1834 | if (!elf_core_write_extra_data(cprm->file, &size, cprm->limit)) |
1835 | goto end_coredump; |
1836 | |
1837 | if (e_phnum == PN_XNUM) { |
1838 | size += sizeof(*shdr4extnum); |
1839 | if (size > cprm->limit |
1840 | || !dump_write(cprm->file, shdr4extnum, |
1841 | sizeof(*shdr4extnum))) |
1842 | goto end_coredump; |
1843 | } |
1844 | |
1845 | if (cprm->file->f_pos != offset) { |
1846 | /* Sanity check */ |
1847 | printk(KERN_WARNING |
1848 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", |
1849 | cprm->file->f_pos, offset); |
1850 | } |
1851 | |
1852 | end_coredump: |
1853 | set_fs(fs); |
1854 | |
1855 | cleanup: |
1856 | while (!list_empty(&thread_list)) { |
1857 | struct list_head *tmp = thread_list.next; |
1858 | list_del(tmp); |
1859 | kfree(list_entry(tmp, struct elf_thread_status, list)); |
1860 | } |
1861 | kfree(phdr4note); |
1862 | kfree(elf); |
1863 | kfree(prstatus); |
1864 | kfree(psinfo); |
1865 | kfree(notes); |
1866 | kfree(fpu); |
1867 | #ifdef ELF_CORE_COPY_XFPREGS |
1868 | kfree(xfpu); |
1869 | #endif |
1870 | return has_dumped; |
1871 | #undef NUM_NOTES |
1872 | } |
1873 | |
1874 | #endif /* CONFIG_ELF_CORE */ |
1875 |
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