blob: 464a972e88c133a917493bd19a68e375c6dfd1d2
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 | #include <linux/dax.h> |
39 | |
40 | #include <asm/uaccess.h> |
41 | #include <asm/param.h> |
42 | #include <asm/pgalloc.h> |
43 | |
44 | typedef char *elf_caddr_t; |
45 | |
46 | #if 0 |
47 | #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
48 | #else |
49 | #define kdebug(fmt, ...) do {} while(0) |
50 | #endif |
51 | |
52 | #if 0 |
53 | #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) |
54 | #else |
55 | #define kdcore(fmt, ...) do {} while(0) |
56 | #endif |
57 | |
58 | MODULE_LICENSE("GPL"); |
59 | |
60 | static int load_elf_fdpic_binary(struct linux_binprm *); |
61 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); |
62 | static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, |
63 | struct mm_struct *, const char *); |
64 | |
65 | static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, |
66 | struct elf_fdpic_params *, |
67 | struct elf_fdpic_params *); |
68 | |
69 | #ifndef CONFIG_MMU |
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 | #ifdef CONFIG_ELF_CORE |
79 | static int elf_fdpic_core_dump(struct coredump_params *cprm); |
80 | #endif |
81 | |
82 | static struct linux_binfmt elf_fdpic_format = { |
83 | .module = THIS_MODULE, |
84 | .load_binary = load_elf_fdpic_binary, |
85 | #ifdef 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 | register_binfmt(&elf_fdpic_format); |
94 | return 0; |
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(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)) |
112 | return 0; |
113 | if (!file->f_op->mmap) |
114 | return 0; |
115 | return 1; |
116 | } |
117 | |
118 | #ifndef elf_check_fdpic |
119 | #define elf_check_fdpic(x) 0 |
120 | #endif |
121 | |
122 | #ifndef elf_check_const_displacement |
123 | #define elf_check_const_displacement(x) 0 |
124 | #endif |
125 | |
126 | static int is_constdisp(struct elfhdr *hdr) |
127 | { |
128 | if (!elf_check_fdpic(hdr)) |
129 | return 1; |
130 | if (elf_check_const_displacement(hdr)) |
131 | return 1; |
132 | return 0; |
133 | } |
134 | |
135 | /*****************************************************************************/ |
136 | /* |
137 | * read the program headers table into memory |
138 | */ |
139 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, |
140 | struct file *file) |
141 | { |
142 | struct elf32_phdr *phdr; |
143 | unsigned long size; |
144 | int retval, loop; |
145 | |
146 | if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) |
147 | return -ENOMEM; |
148 | if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) |
149 | return -ENOMEM; |
150 | |
151 | size = params->hdr.e_phnum * sizeof(struct elf_phdr); |
152 | params->phdrs = kmalloc(size, GFP_KERNEL); |
153 | if (!params->phdrs) |
154 | return -ENOMEM; |
155 | |
156 | retval = kernel_read(file, params->hdr.e_phoff, |
157 | (char *) params->phdrs, size); |
158 | if (unlikely(retval != size)) |
159 | return retval < 0 ? retval : -ENOEXEC; |
160 | |
161 | /* determine stack size for this binary */ |
162 | phdr = params->phdrs; |
163 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
164 | if (phdr->p_type != PT_GNU_STACK) |
165 | continue; |
166 | |
167 | if (phdr->p_flags & PF_X) |
168 | params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; |
169 | else |
170 | params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; |
171 | |
172 | params->stack_size = phdr->p_memsz; |
173 | break; |
174 | } |
175 | |
176 | return 0; |
177 | } |
178 | |
179 | /*****************************************************************************/ |
180 | /* |
181 | * load an fdpic binary into various bits of memory |
182 | */ |
183 | static int load_elf_fdpic_binary(struct linux_binprm *bprm) |
184 | { |
185 | struct elf_fdpic_params exec_params, interp_params; |
186 | struct pt_regs *regs = current_pt_regs(); |
187 | struct elf_phdr *phdr; |
188 | unsigned long stack_size, entryaddr; |
189 | #ifdef ELF_FDPIC_PLAT_INIT |
190 | unsigned long dynaddr; |
191 | #endif |
192 | #ifndef CONFIG_MMU |
193 | unsigned long stack_prot; |
194 | #endif |
195 | struct file *interpreter = NULL; /* to shut gcc up */ |
196 | char *interpreter_name = NULL; |
197 | int executable_stack; |
198 | int retval, i; |
199 | |
200 | kdebug("____ LOAD %d ____", current->pid); |
201 | |
202 | memset(&exec_params, 0, sizeof(exec_params)); |
203 | memset(&interp_params, 0, sizeof(interp_params)); |
204 | |
205 | exec_params.hdr = *(struct elfhdr *) bprm->buf; |
206 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; |
207 | |
208 | /* check that this is a binary we know how to deal with */ |
209 | retval = -ENOEXEC; |
210 | if (!is_elf(&exec_params.hdr, bprm->file)) |
211 | goto error; |
212 | if (!elf_check_fdpic(&exec_params.hdr)) { |
213 | #ifdef CONFIG_MMU |
214 | /* binfmt_elf handles non-fdpic elf except on nommu */ |
215 | goto error; |
216 | #else |
217 | /* nommu can only load ET_DYN (PIE) ELF */ |
218 | if (exec_params.hdr.e_type != ET_DYN) |
219 | goto error; |
220 | #endif |
221 | } |
222 | |
223 | /* read the program header table */ |
224 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); |
225 | if (retval < 0) |
226 | goto error; |
227 | |
228 | /* scan for a program header that specifies an interpreter */ |
229 | phdr = exec_params.phdrs; |
230 | |
231 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { |
232 | switch (phdr->p_type) { |
233 | case PT_INTERP: |
234 | retval = -ENOMEM; |
235 | if (phdr->p_filesz > PATH_MAX) |
236 | goto error; |
237 | retval = -ENOENT; |
238 | if (phdr->p_filesz < 2) |
239 | goto error; |
240 | |
241 | /* read the name of the interpreter into memory */ |
242 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
243 | if (!interpreter_name) |
244 | goto error; |
245 | |
246 | retval = kernel_read(bprm->file, |
247 | phdr->p_offset, |
248 | interpreter_name, |
249 | phdr->p_filesz); |
250 | if (unlikely(retval != phdr->p_filesz)) { |
251 | if (retval >= 0) |
252 | retval = -ENOEXEC; |
253 | goto error; |
254 | } |
255 | |
256 | retval = -ENOENT; |
257 | if (interpreter_name[phdr->p_filesz - 1] != '\0') |
258 | goto error; |
259 | |
260 | kdebug("Using ELF interpreter %s", interpreter_name); |
261 | |
262 | /* replace the program with the interpreter */ |
263 | interpreter = open_exec(interpreter_name); |
264 | retval = PTR_ERR(interpreter); |
265 | if (IS_ERR(interpreter)) { |
266 | interpreter = NULL; |
267 | goto error; |
268 | } |
269 | |
270 | /* |
271 | * If the binary is not readable then enforce |
272 | * mm->dumpable = 0 regardless of the interpreter's |
273 | * permissions. |
274 | */ |
275 | would_dump(bprm, interpreter); |
276 | |
277 | retval = kernel_read(interpreter, 0, bprm->buf, |
278 | BINPRM_BUF_SIZE); |
279 | if (unlikely(retval != BINPRM_BUF_SIZE)) { |
280 | if (retval >= 0) |
281 | retval = -ENOEXEC; |
282 | goto error; |
283 | } |
284 | |
285 | interp_params.hdr = *((struct elfhdr *) bprm->buf); |
286 | break; |
287 | |
288 | case PT_LOAD: |
289 | #ifdef CONFIG_MMU |
290 | if (exec_params.load_addr == 0) |
291 | exec_params.load_addr = phdr->p_vaddr; |
292 | #endif |
293 | break; |
294 | } |
295 | |
296 | } |
297 | |
298 | if (is_constdisp(&exec_params.hdr)) |
299 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
300 | |
301 | /* perform insanity checks on the interpreter */ |
302 | if (interpreter_name) { |
303 | retval = -ELIBBAD; |
304 | if (!is_elf(&interp_params.hdr, interpreter)) |
305 | goto error; |
306 | |
307 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT; |
308 | |
309 | /* read the interpreter's program header table */ |
310 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); |
311 | if (retval < 0) |
312 | goto error; |
313 | } |
314 | |
315 | stack_size = exec_params.stack_size; |
316 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
317 | executable_stack = EXSTACK_ENABLE_X; |
318 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
319 | executable_stack = EXSTACK_DISABLE_X; |
320 | else |
321 | executable_stack = EXSTACK_DEFAULT; |
322 | |
323 | if (stack_size == 0) { |
324 | stack_size = interp_params.stack_size; |
325 | if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
326 | executable_stack = EXSTACK_ENABLE_X; |
327 | else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) |
328 | executable_stack = EXSTACK_DISABLE_X; |
329 | else |
330 | executable_stack = EXSTACK_DEFAULT; |
331 | } |
332 | |
333 | retval = -ENOEXEC; |
334 | if (stack_size == 0) |
335 | stack_size = 131072UL; /* same as exec.c's default commit */ |
336 | |
337 | if (is_constdisp(&interp_params.hdr)) |
338 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; |
339 | |
340 | /* flush all traces of the currently running executable */ |
341 | retval = flush_old_exec(bprm); |
342 | if (retval) |
343 | goto error; |
344 | |
345 | /* there's now no turning back... the old userspace image is dead, |
346 | * defunct, deceased, etc. |
347 | */ |
348 | if (elf_check_fdpic(&exec_params.hdr)) |
349 | set_personality(PER_LINUX_FDPIC); |
350 | else |
351 | set_personality(PER_LINUX); |
352 | if (elf_read_implies_exec(&exec_params.hdr, executable_stack)) |
353 | current->personality |= READ_IMPLIES_EXEC; |
354 | |
355 | setup_new_exec(bprm); |
356 | |
357 | set_binfmt(&elf_fdpic_format); |
358 | |
359 | current->mm->start_code = 0; |
360 | current->mm->end_code = 0; |
361 | current->mm->start_stack = 0; |
362 | current->mm->start_data = 0; |
363 | current->mm->end_data = 0; |
364 | current->mm->context.exec_fdpic_loadmap = 0; |
365 | current->mm->context.interp_fdpic_loadmap = 0; |
366 | |
367 | #ifdef CONFIG_MMU |
368 | elf_fdpic_arch_lay_out_mm(&exec_params, |
369 | &interp_params, |
370 | ¤t->mm->start_stack, |
371 | ¤t->mm->start_brk); |
372 | |
373 | retval = setup_arg_pages(bprm, current->mm->start_stack, |
374 | executable_stack); |
375 | if (retval < 0) |
376 | goto error; |
377 | #endif |
378 | |
379 | /* load the executable and interpreter into memory */ |
380 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
381 | "executable"); |
382 | if (retval < 0) |
383 | goto error; |
384 | |
385 | if (interpreter_name) { |
386 | retval = elf_fdpic_map_file(&interp_params, interpreter, |
387 | current->mm, "interpreter"); |
388 | if (retval < 0) { |
389 | printk(KERN_ERR "Unable to load interpreter\n"); |
390 | goto error; |
391 | } |
392 | |
393 | allow_write_access(interpreter); |
394 | fput(interpreter); |
395 | interpreter = NULL; |
396 | } |
397 | |
398 | #ifdef CONFIG_MMU |
399 | if (!current->mm->start_brk) |
400 | current->mm->start_brk = current->mm->end_data; |
401 | |
402 | current->mm->brk = current->mm->start_brk = |
403 | PAGE_ALIGN(current->mm->start_brk); |
404 | |
405 | #else |
406 | /* create a stack area and zero-size brk area */ |
407 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; |
408 | if (stack_size < PAGE_SIZE * 2) |
409 | stack_size = PAGE_SIZE * 2; |
410 | |
411 | stack_prot = PROT_READ | PROT_WRITE; |
412 | if (executable_stack == EXSTACK_ENABLE_X || |
413 | (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC)) |
414 | stack_prot |= PROT_EXEC; |
415 | |
416 | current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot, |
417 | MAP_PRIVATE | MAP_ANONYMOUS | |
418 | MAP_UNINITIALIZED | MAP_GROWSDOWN, |
419 | 0); |
420 | |
421 | if (IS_ERR_VALUE(current->mm->start_brk)) { |
422 | retval = current->mm->start_brk; |
423 | current->mm->start_brk = 0; |
424 | goto error; |
425 | } |
426 | |
427 | current->mm->brk = current->mm->start_brk; |
428 | current->mm->context.end_brk = current->mm->start_brk; |
429 | current->mm->start_stack = current->mm->start_brk + stack_size; |
430 | #endif |
431 | |
432 | install_exec_creds(bprm); |
433 | if (create_elf_fdpic_tables(bprm, current->mm, |
434 | &exec_params, &interp_params) < 0) |
435 | goto error; |
436 | |
437 | kdebug("- start_code %lx", current->mm->start_code); |
438 | kdebug("- end_code %lx", current->mm->end_code); |
439 | kdebug("- start_data %lx", current->mm->start_data); |
440 | kdebug("- end_data %lx", current->mm->end_data); |
441 | kdebug("- start_brk %lx", current->mm->start_brk); |
442 | kdebug("- brk %lx", current->mm->brk); |
443 | kdebug("- start_stack %lx", current->mm->start_stack); |
444 | |
445 | #ifdef ELF_FDPIC_PLAT_INIT |
446 | /* |
447 | * The ABI may specify that certain registers be set up in special |
448 | * ways (on i386 %edx is the address of a DT_FINI function, for |
449 | * example. This macro performs whatever initialization to |
450 | * the regs structure is required. |
451 | */ |
452 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; |
453 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, |
454 | dynaddr); |
455 | #endif |
456 | |
457 | /* everything is now ready... get the userspace context ready to roll */ |
458 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
459 | start_thread(regs, entryaddr, current->mm->start_stack); |
460 | |
461 | retval = 0; |
462 | |
463 | error: |
464 | if (interpreter) { |
465 | allow_write_access(interpreter); |
466 | fput(interpreter); |
467 | } |
468 | kfree(interpreter_name); |
469 | kfree(exec_params.phdrs); |
470 | kfree(exec_params.loadmap); |
471 | kfree(interp_params.phdrs); |
472 | kfree(interp_params.loadmap); |
473 | return retval; |
474 | } |
475 | |
476 | /*****************************************************************************/ |
477 | |
478 | #ifndef ELF_BASE_PLATFORM |
479 | /* |
480 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. |
481 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value |
482 | * will be copied to the user stack in the same manner as AT_PLATFORM. |
483 | */ |
484 | #define ELF_BASE_PLATFORM NULL |
485 | #endif |
486 | |
487 | /* |
488 | * present useful information to the program by shovelling it onto the new |
489 | * process's stack |
490 | */ |
491 | static int create_elf_fdpic_tables(struct linux_binprm *bprm, |
492 | struct mm_struct *mm, |
493 | struct elf_fdpic_params *exec_params, |
494 | struct elf_fdpic_params *interp_params) |
495 | { |
496 | const struct cred *cred = current_cred(); |
497 | unsigned long sp, csp, nitems; |
498 | elf_caddr_t __user *argv, *envp; |
499 | size_t platform_len = 0, len; |
500 | char *k_platform, *k_base_platform; |
501 | char __user *u_platform, *u_base_platform, *p; |
502 | int loop; |
503 | int nr; /* reset for each csp adjustment */ |
504 | |
505 | #ifdef CONFIG_MMU |
506 | /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions |
507 | * by the processes running on the same package. One thing we can do is |
508 | * to shuffle the initial stack for them, so we give the architecture |
509 | * an opportunity to do so here. |
510 | */ |
511 | sp = arch_align_stack(bprm->p); |
512 | #else |
513 | sp = mm->start_stack; |
514 | |
515 | /* stack the program arguments and environment */ |
516 | if (transfer_args_to_stack(bprm, &sp) < 0) |
517 | return -EFAULT; |
518 | sp &= ~15; |
519 | #endif |
520 | |
521 | /* |
522 | * If this architecture has a platform capability string, copy it |
523 | * to userspace. In some cases (Sparc), this info is impossible |
524 | * for userspace to get any other way, in others (i386) it is |
525 | * merely difficult. |
526 | */ |
527 | k_platform = ELF_PLATFORM; |
528 | u_platform = NULL; |
529 | |
530 | if (k_platform) { |
531 | platform_len = strlen(k_platform) + 1; |
532 | sp -= platform_len; |
533 | u_platform = (char __user *) sp; |
534 | if (__copy_to_user(u_platform, k_platform, platform_len) != 0) |
535 | return -EFAULT; |
536 | } |
537 | |
538 | /* |
539 | * If this architecture has a "base" platform capability |
540 | * string, copy it to userspace. |
541 | */ |
542 | k_base_platform = ELF_BASE_PLATFORM; |
543 | u_base_platform = NULL; |
544 | |
545 | if (k_base_platform) { |
546 | platform_len = strlen(k_base_platform) + 1; |
547 | sp -= platform_len; |
548 | u_base_platform = (char __user *) sp; |
549 | if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0) |
550 | return -EFAULT; |
551 | } |
552 | |
553 | sp &= ~7UL; |
554 | |
555 | /* stack the load map(s) */ |
556 | len = sizeof(struct elf32_fdpic_loadmap); |
557 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; |
558 | sp = (sp - len) & ~7UL; |
559 | exec_params->map_addr = sp; |
560 | |
561 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
562 | return -EFAULT; |
563 | |
564 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; |
565 | |
566 | if (interp_params->loadmap) { |
567 | len = sizeof(struct elf32_fdpic_loadmap); |
568 | len += sizeof(struct elf32_fdpic_loadseg) * |
569 | interp_params->loadmap->nsegs; |
570 | sp = (sp - len) & ~7UL; |
571 | interp_params->map_addr = sp; |
572 | |
573 | if (copy_to_user((void __user *) sp, interp_params->loadmap, |
574 | len) != 0) |
575 | return -EFAULT; |
576 | |
577 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; |
578 | } |
579 | |
580 | /* force 16 byte _final_ alignment here for generality */ |
581 | #define DLINFO_ITEMS 15 |
582 | |
583 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + |
584 | (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH; |
585 | |
586 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) |
587 | nitems++; |
588 | |
589 | csp = sp; |
590 | sp -= nitems * 2 * sizeof(unsigned long); |
591 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ |
592 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ |
593 | sp -= 1 * sizeof(unsigned long); /* argc */ |
594 | |
595 | csp -= sp & 15UL; |
596 | sp -= sp & 15UL; |
597 | |
598 | /* put the ELF interpreter info on the stack */ |
599 | #define NEW_AUX_ENT(id, val) \ |
600 | do { \ |
601 | struct { unsigned long _id, _val; } __user *ent; \ |
602 | \ |
603 | ent = (void __user *) csp; \ |
604 | __put_user((id), &ent[nr]._id); \ |
605 | __put_user((val), &ent[nr]._val); \ |
606 | nr++; \ |
607 | } while (0) |
608 | |
609 | nr = 0; |
610 | csp -= 2 * sizeof(unsigned long); |
611 | NEW_AUX_ENT(AT_NULL, 0); |
612 | if (k_platform) { |
613 | nr = 0; |
614 | csp -= 2 * sizeof(unsigned long); |
615 | NEW_AUX_ENT(AT_PLATFORM, |
616 | (elf_addr_t) (unsigned long) u_platform); |
617 | } |
618 | |
619 | if (k_base_platform) { |
620 | nr = 0; |
621 | csp -= 2 * sizeof(unsigned long); |
622 | NEW_AUX_ENT(AT_BASE_PLATFORM, |
623 | (elf_addr_t) (unsigned long) u_base_platform); |
624 | } |
625 | |
626 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
627 | nr = 0; |
628 | csp -= 2 * sizeof(unsigned long); |
629 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); |
630 | } |
631 | |
632 | nr = 0; |
633 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); |
634 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); |
635 | #ifdef ELF_HWCAP2 |
636 | NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2); |
637 | #endif |
638 | NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE); |
639 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); |
640 | NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr); |
641 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); |
642 | NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum); |
643 | NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr); |
644 | NEW_AUX_ENT(AT_FLAGS, 0); |
645 | NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr); |
646 | NEW_AUX_ENT(AT_UID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid)); |
647 | NEW_AUX_ENT(AT_EUID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid)); |
648 | NEW_AUX_ENT(AT_GID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid)); |
649 | NEW_AUX_ENT(AT_EGID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid)); |
650 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
651 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); |
652 | |
653 | #ifdef ARCH_DLINFO |
654 | nr = 0; |
655 | csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long); |
656 | |
657 | /* ARCH_DLINFO must come last so platform specific code can enforce |
658 | * special alignment requirements on the AUXV if necessary (eg. PPC). |
659 | */ |
660 | ARCH_DLINFO; |
661 | #endif |
662 | #undef NEW_AUX_ENT |
663 | |
664 | /* allocate room for argv[] and envv[] */ |
665 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); |
666 | envp = (elf_caddr_t __user *) csp; |
667 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
668 | argv = (elf_caddr_t __user *) csp; |
669 | |
670 | /* stack argc */ |
671 | csp -= sizeof(unsigned long); |
672 | __put_user(bprm->argc, (unsigned long __user *) csp); |
673 | |
674 | BUG_ON(csp != sp); |
675 | |
676 | /* fill in the argv[] array */ |
677 | #ifdef CONFIG_MMU |
678 | current->mm->arg_start = bprm->p; |
679 | #else |
680 | current->mm->arg_start = current->mm->start_stack - |
681 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); |
682 | #endif |
683 | |
684 | p = (char __user *) current->mm->arg_start; |
685 | for (loop = bprm->argc; loop > 0; loop--) { |
686 | __put_user((elf_caddr_t) p, argv++); |
687 | len = strnlen_user(p, MAX_ARG_STRLEN); |
688 | if (!len || len > MAX_ARG_STRLEN) |
689 | return -EINVAL; |
690 | p += len; |
691 | } |
692 | __put_user(NULL, argv); |
693 | current->mm->arg_end = (unsigned long) p; |
694 | |
695 | /* fill in the envv[] array */ |
696 | current->mm->env_start = (unsigned long) p; |
697 | for (loop = bprm->envc; loop > 0; loop--) { |
698 | __put_user((elf_caddr_t)(unsigned long) p, envp++); |
699 | len = strnlen_user(p, MAX_ARG_STRLEN); |
700 | if (!len || len > MAX_ARG_STRLEN) |
701 | return -EINVAL; |
702 | p += len; |
703 | } |
704 | __put_user(NULL, envp); |
705 | current->mm->env_end = (unsigned long) p; |
706 | |
707 | mm->start_stack = (unsigned long) sp; |
708 | return 0; |
709 | } |
710 | |
711 | /*****************************************************************************/ |
712 | /* |
713 | * load the appropriate binary image (executable or interpreter) into memory |
714 | * - we assume no MMU is available |
715 | * - if no other PIC bits are set in params->hdr->e_flags |
716 | * - we assume that the LOADable segments in the binary are independently relocatable |
717 | * - we assume R/O executable segments are shareable |
718 | * - else |
719 | * - we assume the loadable parts of the image to require fixed displacement |
720 | * - the image is not shareable |
721 | */ |
722 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, |
723 | struct file *file, |
724 | struct mm_struct *mm, |
725 | const char *what) |
726 | { |
727 | struct elf32_fdpic_loadmap *loadmap; |
728 | #ifdef CONFIG_MMU |
729 | struct elf32_fdpic_loadseg *mseg; |
730 | #endif |
731 | struct elf32_fdpic_loadseg *seg; |
732 | struct elf32_phdr *phdr; |
733 | unsigned long load_addr, stop; |
734 | unsigned nloads, tmp; |
735 | size_t size; |
736 | int loop, ret; |
737 | |
738 | /* allocate a load map table */ |
739 | nloads = 0; |
740 | for (loop = 0; loop < params->hdr.e_phnum; loop++) |
741 | if (params->phdrs[loop].p_type == PT_LOAD) |
742 | nloads++; |
743 | |
744 | if (nloads == 0) |
745 | return -ELIBBAD; |
746 | |
747 | size = sizeof(*loadmap) + nloads * sizeof(*seg); |
748 | loadmap = kzalloc(size, GFP_KERNEL); |
749 | if (!loadmap) |
750 | return -ENOMEM; |
751 | |
752 | params->loadmap = loadmap; |
753 | |
754 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; |
755 | loadmap->nsegs = nloads; |
756 | |
757 | load_addr = params->load_addr; |
758 | seg = loadmap->segs; |
759 | |
760 | /* map the requested LOADs into the memory space */ |
761 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
762 | case ELF_FDPIC_FLAG_CONSTDISP: |
763 | case ELF_FDPIC_FLAG_CONTIGUOUS: |
764 | #ifndef CONFIG_MMU |
765 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); |
766 | if (ret < 0) |
767 | return ret; |
768 | break; |
769 | #endif |
770 | default: |
771 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); |
772 | if (ret < 0) |
773 | return ret; |
774 | break; |
775 | } |
776 | |
777 | /* map the entry point */ |
778 | if (params->hdr.e_entry) { |
779 | seg = loadmap->segs; |
780 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
781 | if (params->hdr.e_entry >= seg->p_vaddr && |
782 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
783 | params->entry_addr = |
784 | (params->hdr.e_entry - seg->p_vaddr) + |
785 | seg->addr; |
786 | break; |
787 | } |
788 | } |
789 | } |
790 | |
791 | /* determine where the program header table has wound up if mapped */ |
792 | stop = params->hdr.e_phoff; |
793 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); |
794 | phdr = params->phdrs; |
795 | |
796 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
797 | if (phdr->p_type != PT_LOAD) |
798 | continue; |
799 | |
800 | if (phdr->p_offset > params->hdr.e_phoff || |
801 | phdr->p_offset + phdr->p_filesz < stop) |
802 | continue; |
803 | |
804 | seg = loadmap->segs; |
805 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
806 | if (phdr->p_vaddr >= seg->p_vaddr && |
807 | phdr->p_vaddr + phdr->p_filesz <= |
808 | seg->p_vaddr + seg->p_memsz) { |
809 | params->ph_addr = |
810 | (phdr->p_vaddr - seg->p_vaddr) + |
811 | seg->addr + |
812 | params->hdr.e_phoff - phdr->p_offset; |
813 | break; |
814 | } |
815 | } |
816 | break; |
817 | } |
818 | |
819 | /* determine where the dynamic section has wound up if there is one */ |
820 | phdr = params->phdrs; |
821 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
822 | if (phdr->p_type != PT_DYNAMIC) |
823 | continue; |
824 | |
825 | seg = loadmap->segs; |
826 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { |
827 | if (phdr->p_vaddr >= seg->p_vaddr && |
828 | phdr->p_vaddr + phdr->p_memsz <= |
829 | seg->p_vaddr + seg->p_memsz) { |
830 | params->dynamic_addr = |
831 | (phdr->p_vaddr - seg->p_vaddr) + |
832 | seg->addr; |
833 | |
834 | /* check the dynamic section contains at least |
835 | * one item, and that the last item is a NULL |
836 | * entry */ |
837 | if (phdr->p_memsz == 0 || |
838 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) |
839 | goto dynamic_error; |
840 | |
841 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); |
842 | if (((Elf32_Dyn *) |
843 | params->dynamic_addr)[tmp - 1].d_tag != 0) |
844 | goto dynamic_error; |
845 | break; |
846 | } |
847 | } |
848 | break; |
849 | } |
850 | |
851 | /* now elide adjacent segments in the load map on MMU linux |
852 | * - on uClinux the holes between may actually be filled with system |
853 | * stuff or stuff from other processes |
854 | */ |
855 | #ifdef CONFIG_MMU |
856 | nloads = loadmap->nsegs; |
857 | mseg = loadmap->segs; |
858 | seg = mseg + 1; |
859 | for (loop = 1; loop < nloads; loop++) { |
860 | /* see if we have a candidate for merging */ |
861 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { |
862 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); |
863 | if (load_addr == (seg->addr & PAGE_MASK)) { |
864 | mseg->p_memsz += |
865 | load_addr - |
866 | (mseg->addr + mseg->p_memsz); |
867 | mseg->p_memsz += seg->addr & ~PAGE_MASK; |
868 | mseg->p_memsz += seg->p_memsz; |
869 | loadmap->nsegs--; |
870 | continue; |
871 | } |
872 | } |
873 | |
874 | mseg++; |
875 | if (mseg != seg) |
876 | *mseg = *seg; |
877 | } |
878 | #endif |
879 | |
880 | kdebug("Mapped Object [%s]:", what); |
881 | kdebug("- elfhdr : %lx", params->elfhdr_addr); |
882 | kdebug("- entry : %lx", params->entry_addr); |
883 | kdebug("- PHDR[] : %lx", params->ph_addr); |
884 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); |
885 | seg = loadmap->segs; |
886 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) |
887 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", |
888 | loop, |
889 | seg->addr, seg->addr + seg->p_memsz - 1, |
890 | seg->p_vaddr, seg->p_memsz); |
891 | |
892 | return 0; |
893 | |
894 | dynamic_error: |
895 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
896 | what, file_inode(file)->i_ino); |
897 | return -ELIBBAD; |
898 | } |
899 | |
900 | /*****************************************************************************/ |
901 | /* |
902 | * map a file with constant displacement under uClinux |
903 | */ |
904 | #ifndef CONFIG_MMU |
905 | static int elf_fdpic_map_file_constdisp_on_uclinux( |
906 | struct elf_fdpic_params *params, |
907 | struct file *file, |
908 | struct mm_struct *mm) |
909 | { |
910 | struct elf32_fdpic_loadseg *seg; |
911 | struct elf32_phdr *phdr; |
912 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags; |
913 | int loop, ret; |
914 | |
915 | load_addr = params->load_addr; |
916 | seg = params->loadmap->segs; |
917 | |
918 | /* determine the bounds of the contiguous overall allocation we must |
919 | * make */ |
920 | phdr = params->phdrs; |
921 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
922 | if (params->phdrs[loop].p_type != PT_LOAD) |
923 | continue; |
924 | |
925 | if (base > phdr->p_vaddr) |
926 | base = phdr->p_vaddr; |
927 | if (top < phdr->p_vaddr + phdr->p_memsz) |
928 | top = phdr->p_vaddr + phdr->p_memsz; |
929 | } |
930 | |
931 | /* allocate one big anon block for everything */ |
932 | mflags = MAP_PRIVATE; |
933 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) |
934 | mflags |= MAP_EXECUTABLE; |
935 | |
936 | maddr = vm_mmap(NULL, load_addr, top - base, |
937 | PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); |
938 | if (IS_ERR_VALUE(maddr)) |
939 | return (int) maddr; |
940 | |
941 | if (load_addr != 0) |
942 | load_addr += PAGE_ALIGN(top - base); |
943 | |
944 | /* and then load the file segments into it */ |
945 | phdr = params->phdrs; |
946 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
947 | if (params->phdrs[loop].p_type != PT_LOAD) |
948 | continue; |
949 | |
950 | seg->addr = maddr + (phdr->p_vaddr - base); |
951 | seg->p_vaddr = phdr->p_vaddr; |
952 | seg->p_memsz = phdr->p_memsz; |
953 | |
954 | ret = read_code(file, seg->addr, phdr->p_offset, |
955 | phdr->p_filesz); |
956 | if (ret < 0) |
957 | return ret; |
958 | |
959 | /* map the ELF header address if in this segment */ |
960 | if (phdr->p_offset == 0) |
961 | params->elfhdr_addr = seg->addr; |
962 | |
963 | /* clear any space allocated but not loaded */ |
964 | if (phdr->p_filesz < phdr->p_memsz) { |
965 | if (clear_user((void *) (seg->addr + phdr->p_filesz), |
966 | phdr->p_memsz - phdr->p_filesz)) |
967 | return -EFAULT; |
968 | } |
969 | |
970 | if (mm) { |
971 | if (phdr->p_flags & PF_X) { |
972 | if (!mm->start_code) { |
973 | mm->start_code = seg->addr; |
974 | mm->end_code = seg->addr + |
975 | phdr->p_memsz; |
976 | } |
977 | } else if (!mm->start_data) { |
978 | mm->start_data = seg->addr; |
979 | mm->end_data = seg->addr + phdr->p_memsz; |
980 | } |
981 | } |
982 | |
983 | seg++; |
984 | } |
985 | |
986 | return 0; |
987 | } |
988 | #endif |
989 | |
990 | /*****************************************************************************/ |
991 | /* |
992 | * map a binary by direct mmap() of the individual PT_LOAD segments |
993 | */ |
994 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, |
995 | struct file *file, |
996 | struct mm_struct *mm) |
997 | { |
998 | struct elf32_fdpic_loadseg *seg; |
999 | struct elf32_phdr *phdr; |
1000 | unsigned long load_addr, delta_vaddr; |
1001 | int loop, dvset; |
1002 | |
1003 | load_addr = params->load_addr; |
1004 | delta_vaddr = 0; |
1005 | dvset = 0; |
1006 | |
1007 | seg = params->loadmap->segs; |
1008 | |
1009 | /* deal with each load segment separately */ |
1010 | phdr = params->phdrs; |
1011 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { |
1012 | unsigned long maddr, disp, excess, excess1; |
1013 | int prot = 0, flags; |
1014 | |
1015 | if (phdr->p_type != PT_LOAD) |
1016 | continue; |
1017 | |
1018 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", |
1019 | (unsigned long) phdr->p_vaddr, |
1020 | (unsigned long) phdr->p_offset, |
1021 | (unsigned long) phdr->p_filesz, |
1022 | (unsigned long) phdr->p_memsz); |
1023 | |
1024 | /* determine the mapping parameters */ |
1025 | if (phdr->p_flags & PF_R) prot |= PROT_READ; |
1026 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; |
1027 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; |
1028 | |
1029 | flags = MAP_PRIVATE | MAP_DENYWRITE; |
1030 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) |
1031 | flags |= MAP_EXECUTABLE; |
1032 | |
1033 | maddr = 0; |
1034 | |
1035 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { |
1036 | case ELF_FDPIC_FLAG_INDEPENDENT: |
1037 | /* PT_LOADs are independently locatable */ |
1038 | break; |
1039 | |
1040 | case ELF_FDPIC_FLAG_HONOURVADDR: |
1041 | /* the specified virtual address must be honoured */ |
1042 | maddr = phdr->p_vaddr; |
1043 | flags |= MAP_FIXED; |
1044 | break; |
1045 | |
1046 | case ELF_FDPIC_FLAG_CONSTDISP: |
1047 | /* constant displacement |
1048 | * - can be mapped anywhere, but must be mapped as a |
1049 | * unit |
1050 | */ |
1051 | if (!dvset) { |
1052 | maddr = load_addr; |
1053 | delta_vaddr = phdr->p_vaddr; |
1054 | dvset = 1; |
1055 | } else { |
1056 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
1057 | flags |= MAP_FIXED; |
1058 | } |
1059 | break; |
1060 | |
1061 | case ELF_FDPIC_FLAG_CONTIGUOUS: |
1062 | /* contiguity handled later */ |
1063 | break; |
1064 | |
1065 | default: |
1066 | BUG(); |
1067 | } |
1068 | |
1069 | maddr &= PAGE_MASK; |
1070 | |
1071 | /* create the mapping */ |
1072 | disp = phdr->p_vaddr & ~PAGE_MASK; |
1073 | maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, |
1074 | phdr->p_offset - disp); |
1075 | |
1076 | kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", |
1077 | loop, phdr->p_memsz + disp, prot, flags, |
1078 | phdr->p_offset - disp, maddr); |
1079 | |
1080 | if (IS_ERR_VALUE(maddr)) |
1081 | return (int) maddr; |
1082 | |
1083 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
1084 | ELF_FDPIC_FLAG_CONTIGUOUS) |
1085 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
1086 | |
1087 | seg->addr = maddr + disp; |
1088 | seg->p_vaddr = phdr->p_vaddr; |
1089 | seg->p_memsz = phdr->p_memsz; |
1090 | |
1091 | /* map the ELF header address if in this segment */ |
1092 | if (phdr->p_offset == 0) |
1093 | params->elfhdr_addr = seg->addr; |
1094 | |
1095 | /* clear the bit between beginning of mapping and beginning of |
1096 | * PT_LOAD */ |
1097 | if (prot & PROT_WRITE && disp > 0) { |
1098 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); |
1099 | if (clear_user((void __user *) maddr, disp)) |
1100 | return -EFAULT; |
1101 | maddr += disp; |
1102 | } |
1103 | |
1104 | /* clear any space allocated but not loaded |
1105 | * - on uClinux we can just clear the lot |
1106 | * - on MMU linux we'll get a SIGBUS beyond the last page |
1107 | * extant in the file |
1108 | */ |
1109 | excess = phdr->p_memsz - phdr->p_filesz; |
1110 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); |
1111 | |
1112 | #ifdef CONFIG_MMU |
1113 | if (excess > excess1) { |
1114 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; |
1115 | unsigned long xmaddr; |
1116 | |
1117 | flags |= MAP_FIXED | MAP_ANONYMOUS; |
1118 | xmaddr = vm_mmap(NULL, xaddr, excess - excess1, |
1119 | prot, flags, 0); |
1120 | |
1121 | kdebug("mmap[%d] <anon>" |
1122 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", |
1123 | loop, xaddr, excess - excess1, prot, flags, |
1124 | xmaddr); |
1125 | |
1126 | if (xmaddr != xaddr) |
1127 | return -ENOMEM; |
1128 | } |
1129 | |
1130 | if (prot & PROT_WRITE && excess1 > 0) { |
1131 | kdebug("clear[%d] ad=%lx sz=%lx", |
1132 | loop, maddr + phdr->p_filesz, excess1); |
1133 | if (clear_user((void __user *) maddr + phdr->p_filesz, |
1134 | excess1)) |
1135 | return -EFAULT; |
1136 | } |
1137 | |
1138 | #else |
1139 | if (excess > 0) { |
1140 | kdebug("clear[%d] ad=%lx sz=%lx", |
1141 | loop, maddr + phdr->p_filesz, excess); |
1142 | if (clear_user((void *) maddr + phdr->p_filesz, excess)) |
1143 | return -EFAULT; |
1144 | } |
1145 | #endif |
1146 | |
1147 | if (mm) { |
1148 | if (phdr->p_flags & PF_X) { |
1149 | if (!mm->start_code) { |
1150 | mm->start_code = maddr; |
1151 | mm->end_code = maddr + phdr->p_memsz; |
1152 | } |
1153 | } else if (!mm->start_data) { |
1154 | mm->start_data = maddr; |
1155 | mm->end_data = maddr + phdr->p_memsz; |
1156 | } |
1157 | } |
1158 | |
1159 | seg++; |
1160 | } |
1161 | |
1162 | return 0; |
1163 | } |
1164 | |
1165 | /*****************************************************************************/ |
1166 | /* |
1167 | * ELF-FDPIC core dumper |
1168 | * |
1169 | * Modelled on fs/exec.c:aout_core_dump() |
1170 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> |
1171 | * |
1172 | * Modelled on fs/binfmt_elf.c core dumper |
1173 | */ |
1174 | #ifdef CONFIG_ELF_CORE |
1175 | |
1176 | /* |
1177 | * Decide whether a segment is worth dumping; default is yes to be |
1178 | * sure (missing info is worse than too much; etc). |
1179 | * Personally I'd include everything, and use the coredump limit... |
1180 | * |
1181 | * I think we should skip something. But I am not sure how. H.J. |
1182 | */ |
1183 | static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) |
1184 | { |
1185 | int dump_ok; |
1186 | |
1187 | /* Do not dump I/O mapped devices or special mappings */ |
1188 | if (vma->vm_flags & VM_IO) { |
1189 | kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags); |
1190 | return 0; |
1191 | } |
1192 | |
1193 | /* If we may not read the contents, don't allow us to dump |
1194 | * them either. "dump_write()" can't handle it anyway. |
1195 | */ |
1196 | if (!(vma->vm_flags & VM_READ)) { |
1197 | kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags); |
1198 | return 0; |
1199 | } |
1200 | |
1201 | /* support for DAX */ |
1202 | if (vma_is_dax(vma)) { |
1203 | if (vma->vm_flags & VM_SHARED) { |
1204 | dump_ok = test_bit(MMF_DUMP_DAX_SHARED, &mm_flags); |
1205 | kdcore("%08lx: %08lx: %s (DAX shared)", vma->vm_start, |
1206 | vma->vm_flags, dump_ok ? "yes" : "no"); |
1207 | } else { |
1208 | dump_ok = test_bit(MMF_DUMP_DAX_PRIVATE, &mm_flags); |
1209 | kdcore("%08lx: %08lx: %s (DAX private)", vma->vm_start, |
1210 | vma->vm_flags, dump_ok ? "yes" : "no"); |
1211 | } |
1212 | return dump_ok; |
1213 | } |
1214 | |
1215 | /* By default, dump shared memory if mapped from an anonymous file. */ |
1216 | if (vma->vm_flags & VM_SHARED) { |
1217 | if (file_inode(vma->vm_file)->i_nlink == 0) { |
1218 | dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags); |
1219 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, |
1220 | vma->vm_flags, dump_ok ? "yes" : "no"); |
1221 | return dump_ok; |
1222 | } |
1223 | |
1224 | dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags); |
1225 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, |
1226 | vma->vm_flags, dump_ok ? "yes" : "no"); |
1227 | return dump_ok; |
1228 | } |
1229 | |
1230 | #ifdef CONFIG_MMU |
1231 | /* By default, if it hasn't been written to, don't write it out */ |
1232 | if (!vma->anon_vma) { |
1233 | dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags); |
1234 | kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start, |
1235 | vma->vm_flags, dump_ok ? "yes" : "no"); |
1236 | return dump_ok; |
1237 | } |
1238 | #endif |
1239 | |
1240 | dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags); |
1241 | kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags, |
1242 | dump_ok ? "yes" : "no"); |
1243 | return dump_ok; |
1244 | } |
1245 | |
1246 | /* An ELF note in memory */ |
1247 | struct memelfnote |
1248 | { |
1249 | const char *name; |
1250 | int type; |
1251 | unsigned int datasz; |
1252 | void *data; |
1253 | }; |
1254 | |
1255 | static int notesize(struct memelfnote *en) |
1256 | { |
1257 | int sz; |
1258 | |
1259 | sz = sizeof(struct elf_note); |
1260 | sz += roundup(strlen(en->name) + 1, 4); |
1261 | sz += roundup(en->datasz, 4); |
1262 | |
1263 | return sz; |
1264 | } |
1265 | |
1266 | /* #define DEBUG */ |
1267 | |
1268 | static int writenote(struct memelfnote *men, struct coredump_params *cprm) |
1269 | { |
1270 | struct elf_note en; |
1271 | en.n_namesz = strlen(men->name) + 1; |
1272 | en.n_descsz = men->datasz; |
1273 | en.n_type = men->type; |
1274 | |
1275 | return dump_emit(cprm, &en, sizeof(en)) && |
1276 | dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) && |
1277 | dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4); |
1278 | } |
1279 | |
1280 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) |
1281 | { |
1282 | memcpy(elf->e_ident, ELFMAG, SELFMAG); |
1283 | elf->e_ident[EI_CLASS] = ELF_CLASS; |
1284 | elf->e_ident[EI_DATA] = ELF_DATA; |
1285 | elf->e_ident[EI_VERSION] = EV_CURRENT; |
1286 | elf->e_ident[EI_OSABI] = ELF_OSABI; |
1287 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); |
1288 | |
1289 | elf->e_type = ET_CORE; |
1290 | elf->e_machine = ELF_ARCH; |
1291 | elf->e_version = EV_CURRENT; |
1292 | elf->e_entry = 0; |
1293 | elf->e_phoff = sizeof(struct elfhdr); |
1294 | elf->e_shoff = 0; |
1295 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS; |
1296 | elf->e_ehsize = sizeof(struct elfhdr); |
1297 | elf->e_phentsize = sizeof(struct elf_phdr); |
1298 | elf->e_phnum = segs; |
1299 | elf->e_shentsize = 0; |
1300 | elf->e_shnum = 0; |
1301 | elf->e_shstrndx = 0; |
1302 | return; |
1303 | } |
1304 | |
1305 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) |
1306 | { |
1307 | phdr->p_type = PT_NOTE; |
1308 | phdr->p_offset = offset; |
1309 | phdr->p_vaddr = 0; |
1310 | phdr->p_paddr = 0; |
1311 | phdr->p_filesz = sz; |
1312 | phdr->p_memsz = 0; |
1313 | phdr->p_flags = 0; |
1314 | phdr->p_align = 0; |
1315 | return; |
1316 | } |
1317 | |
1318 | static inline void fill_note(struct memelfnote *note, const char *name, int type, |
1319 | unsigned int sz, void *data) |
1320 | { |
1321 | note->name = name; |
1322 | note->type = type; |
1323 | note->datasz = sz; |
1324 | note->data = data; |
1325 | return; |
1326 | } |
1327 | |
1328 | /* |
1329 | * fill up all the fields in prstatus from the given task struct, except |
1330 | * registers which need to be filled up separately. |
1331 | */ |
1332 | static void fill_prstatus(struct elf_prstatus *prstatus, |
1333 | struct task_struct *p, long signr) |
1334 | { |
1335 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; |
1336 | prstatus->pr_sigpend = p->pending.signal.sig[0]; |
1337 | prstatus->pr_sighold = p->blocked.sig[0]; |
1338 | rcu_read_lock(); |
1339 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); |
1340 | rcu_read_unlock(); |
1341 | prstatus->pr_pid = task_pid_vnr(p); |
1342 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1343 | prstatus->pr_sid = task_session_vnr(p); |
1344 | if (thread_group_leader(p)) { |
1345 | struct task_cputime cputime; |
1346 | |
1347 | /* |
1348 | * This is the record for the group leader. It shows the |
1349 | * group-wide total, not its individual thread total. |
1350 | */ |
1351 | thread_group_cputime(p, &cputime); |
1352 | cputime_to_timeval(cputime.utime, &prstatus->pr_utime); |
1353 | cputime_to_timeval(cputime.stime, &prstatus->pr_stime); |
1354 | } else { |
1355 | cputime_t utime, stime; |
1356 | |
1357 | task_cputime(p, &utime, &stime); |
1358 | cputime_to_timeval(utime, &prstatus->pr_utime); |
1359 | cputime_to_timeval(stime, &prstatus->pr_stime); |
1360 | } |
1361 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); |
1362 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); |
1363 | |
1364 | prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; |
1365 | prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; |
1366 | } |
1367 | |
1368 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, |
1369 | struct mm_struct *mm) |
1370 | { |
1371 | const struct cred *cred; |
1372 | unsigned int i, len; |
1373 | |
1374 | /* first copy the parameters from user space */ |
1375 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); |
1376 | |
1377 | len = mm->arg_end - mm->arg_start; |
1378 | if (len >= ELF_PRARGSZ) |
1379 | len = ELF_PRARGSZ - 1; |
1380 | if (copy_from_user(&psinfo->pr_psargs, |
1381 | (const char __user *) mm->arg_start, len)) |
1382 | return -EFAULT; |
1383 | for (i = 0; i < len; i++) |
1384 | if (psinfo->pr_psargs[i] == 0) |
1385 | psinfo->pr_psargs[i] = ' '; |
1386 | psinfo->pr_psargs[len] = 0; |
1387 | |
1388 | rcu_read_lock(); |
1389 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); |
1390 | rcu_read_unlock(); |
1391 | psinfo->pr_pid = task_pid_vnr(p); |
1392 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1393 | psinfo->pr_sid = task_session_vnr(p); |
1394 | |
1395 | i = p->state ? ffz(~p->state) + 1 : 0; |
1396 | psinfo->pr_state = i; |
1397 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; |
1398 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; |
1399 | psinfo->pr_nice = task_nice(p); |
1400 | psinfo->pr_flag = p->flags; |
1401 | rcu_read_lock(); |
1402 | cred = __task_cred(p); |
1403 | SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); |
1404 | SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid)); |
1405 | rcu_read_unlock(); |
1406 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1407 | |
1408 | return 0; |
1409 | } |
1410 | |
1411 | /* Here is the structure in which status of each thread is captured. */ |
1412 | struct elf_thread_status |
1413 | { |
1414 | struct list_head list; |
1415 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ |
1416 | elf_fpregset_t fpu; /* NT_PRFPREG */ |
1417 | struct task_struct *thread; |
1418 | #ifdef ELF_CORE_COPY_XFPREGS |
1419 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
1420 | #endif |
1421 | struct memelfnote notes[3]; |
1422 | int num_notes; |
1423 | }; |
1424 | |
1425 | /* |
1426 | * In order to add the specific thread information for the elf file format, |
1427 | * we need to keep a linked list of every thread's pr_status and then create |
1428 | * a single section for them in the final core file. |
1429 | */ |
1430 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) |
1431 | { |
1432 | struct task_struct *p = t->thread; |
1433 | int sz = 0; |
1434 | |
1435 | t->num_notes = 0; |
1436 | |
1437 | fill_prstatus(&t->prstatus, p, signr); |
1438 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); |
1439 | |
1440 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), |
1441 | &t->prstatus); |
1442 | t->num_notes++; |
1443 | sz += notesize(&t->notes[0]); |
1444 | |
1445 | t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu); |
1446 | if (t->prstatus.pr_fpvalid) { |
1447 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), |
1448 | &t->fpu); |
1449 | t->num_notes++; |
1450 | sz += notesize(&t->notes[1]); |
1451 | } |
1452 | |
1453 | #ifdef ELF_CORE_COPY_XFPREGS |
1454 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { |
1455 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1456 | sizeof(t->xfpu), &t->xfpu); |
1457 | t->num_notes++; |
1458 | sz += notesize(&t->notes[2]); |
1459 | } |
1460 | #endif |
1461 | return sz; |
1462 | } |
1463 | |
1464 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
1465 | elf_addr_t e_shoff, int segs) |
1466 | { |
1467 | elf->e_shoff = e_shoff; |
1468 | elf->e_shentsize = sizeof(*shdr4extnum); |
1469 | elf->e_shnum = 1; |
1470 | elf->e_shstrndx = SHN_UNDEF; |
1471 | |
1472 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); |
1473 | |
1474 | shdr4extnum->sh_type = SHT_NULL; |
1475 | shdr4extnum->sh_size = elf->e_shnum; |
1476 | shdr4extnum->sh_link = elf->e_shstrndx; |
1477 | shdr4extnum->sh_info = segs; |
1478 | } |
1479 | |
1480 | /* |
1481 | * dump the segments for an MMU process |
1482 | */ |
1483 | static bool elf_fdpic_dump_segments(struct coredump_params *cprm) |
1484 | { |
1485 | struct vm_area_struct *vma; |
1486 | |
1487 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
1488 | unsigned long addr; |
1489 | |
1490 | if (!maydump(vma, cprm->mm_flags)) |
1491 | continue; |
1492 | |
1493 | #ifdef CONFIG_MMU |
1494 | for (addr = vma->vm_start; addr < vma->vm_end; |
1495 | addr += PAGE_SIZE) { |
1496 | bool res; |
1497 | struct page *page = get_dump_page(addr); |
1498 | if (page) { |
1499 | void *kaddr = kmap(page); |
1500 | res = dump_emit(cprm, kaddr, PAGE_SIZE); |
1501 | kunmap(page); |
1502 | put_page(page); |
1503 | } else { |
1504 | res = dump_skip(cprm, PAGE_SIZE); |
1505 | } |
1506 | if (!res) |
1507 | return false; |
1508 | } |
1509 | #else |
1510 | if (!dump_emit(cprm, (void *) vma->vm_start, |
1511 | vma->vm_end - vma->vm_start)) |
1512 | return false; |
1513 | #endif |
1514 | } |
1515 | return true; |
1516 | } |
1517 | |
1518 | static size_t elf_core_vma_data_size(unsigned long mm_flags) |
1519 | { |
1520 | struct vm_area_struct *vma; |
1521 | size_t size = 0; |
1522 | |
1523 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) |
1524 | if (maydump(vma, mm_flags)) |
1525 | size += vma->vm_end - vma->vm_start; |
1526 | return size; |
1527 | } |
1528 | |
1529 | /* |
1530 | * Actual dumper |
1531 | * |
1532 | * This is a two-pass process; first we find the offsets of the bits, |
1533 | * and then they are actually written out. If we run out of core limit |
1534 | * we just truncate. |
1535 | */ |
1536 | static int elf_fdpic_core_dump(struct coredump_params *cprm) |
1537 | { |
1538 | #define NUM_NOTES 6 |
1539 | int has_dumped = 0; |
1540 | mm_segment_t fs; |
1541 | int segs; |
1542 | int i; |
1543 | struct vm_area_struct *vma; |
1544 | struct elfhdr *elf = NULL; |
1545 | loff_t offset = 0, dataoff; |
1546 | int numnote; |
1547 | struct memelfnote *notes = NULL; |
1548 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ |
1549 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ |
1550 | LIST_HEAD(thread_list); |
1551 | struct list_head *t; |
1552 | elf_fpregset_t *fpu = NULL; |
1553 | #ifdef ELF_CORE_COPY_XFPREGS |
1554 | elf_fpxregset_t *xfpu = NULL; |
1555 | #endif |
1556 | int thread_status_size = 0; |
1557 | elf_addr_t *auxv; |
1558 | struct elf_phdr *phdr4note = NULL; |
1559 | struct elf_shdr *shdr4extnum = NULL; |
1560 | Elf_Half e_phnum; |
1561 | elf_addr_t e_shoff; |
1562 | struct core_thread *ct; |
1563 | struct elf_thread_status *tmp; |
1564 | |
1565 | /* |
1566 | * We no longer stop all VM operations. |
1567 | * |
1568 | * This is because those proceses that could possibly change map_count |
1569 | * or the mmap / vma pages are now blocked in do_exit on current |
1570 | * finishing this core dump. |
1571 | * |
1572 | * Only ptrace can touch these memory addresses, but it doesn't change |
1573 | * the map_count or the pages allocated. So no possibility of crashing |
1574 | * exists while dumping the mm->vm_next areas to the core file. |
1575 | */ |
1576 | |
1577 | /* alloc memory for large data structures: too large to be on stack */ |
1578 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); |
1579 | if (!elf) |
1580 | goto cleanup; |
1581 | prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL); |
1582 | if (!prstatus) |
1583 | goto cleanup; |
1584 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); |
1585 | if (!psinfo) |
1586 | goto cleanup; |
1587 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); |
1588 | if (!notes) |
1589 | goto cleanup; |
1590 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); |
1591 | if (!fpu) |
1592 | goto cleanup; |
1593 | #ifdef ELF_CORE_COPY_XFPREGS |
1594 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); |
1595 | if (!xfpu) |
1596 | goto cleanup; |
1597 | #endif |
1598 | |
1599 | for (ct = current->mm->core_state->dumper.next; |
1600 | ct; ct = ct->next) { |
1601 | tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); |
1602 | if (!tmp) |
1603 | goto cleanup; |
1604 | |
1605 | tmp->thread = ct->task; |
1606 | list_add(&tmp->list, &thread_list); |
1607 | } |
1608 | |
1609 | list_for_each(t, &thread_list) { |
1610 | struct elf_thread_status *tmp; |
1611 | int sz; |
1612 | |
1613 | tmp = list_entry(t, struct elf_thread_status, list); |
1614 | sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp); |
1615 | thread_status_size += sz; |
1616 | } |
1617 | |
1618 | /* now collect the dump for the current */ |
1619 | fill_prstatus(prstatus, current, cprm->siginfo->si_signo); |
1620 | elf_core_copy_regs(&prstatus->pr_reg, cprm->regs); |
1621 | |
1622 | segs = current->mm->map_count; |
1623 | segs += elf_core_extra_phdrs(); |
1624 | |
1625 | /* for notes section */ |
1626 | segs++; |
1627 | |
1628 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid |
1629 | * this, kernel supports extended numbering. Have a look at |
1630 | * include/linux/elf.h for further information. */ |
1631 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; |
1632 | |
1633 | /* Set up header */ |
1634 | fill_elf_fdpic_header(elf, e_phnum); |
1635 | |
1636 | has_dumped = 1; |
1637 | /* |
1638 | * Set up the notes in similar form to SVR4 core dumps made |
1639 | * with info from their /proc. |
1640 | */ |
1641 | |
1642 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); |
1643 | fill_psinfo(psinfo, current->group_leader, current->mm); |
1644 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); |
1645 | |
1646 | numnote = 2; |
1647 | |
1648 | auxv = (elf_addr_t *) current->mm->saved_auxv; |
1649 | |
1650 | i = 0; |
1651 | do |
1652 | i += 2; |
1653 | while (auxv[i - 2] != AT_NULL); |
1654 | fill_note(¬es[numnote++], "CORE", NT_AUXV, |
1655 | i * sizeof(elf_addr_t), auxv); |
1656 | |
1657 | /* Try to dump the FPU. */ |
1658 | if ((prstatus->pr_fpvalid = |
1659 | elf_core_copy_task_fpregs(current, cprm->regs, fpu))) |
1660 | fill_note(notes + numnote++, |
1661 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); |
1662 | #ifdef ELF_CORE_COPY_XFPREGS |
1663 | if (elf_core_copy_task_xfpregs(current, xfpu)) |
1664 | fill_note(notes + numnote++, |
1665 | "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu); |
1666 | #endif |
1667 | |
1668 | fs = get_fs(); |
1669 | set_fs(KERNEL_DS); |
1670 | |
1671 | offset += sizeof(*elf); /* Elf header */ |
1672 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
1673 | |
1674 | /* Write notes phdr entry */ |
1675 | { |
1676 | int sz = 0; |
1677 | |
1678 | for (i = 0; i < numnote; i++) |
1679 | sz += notesize(notes + i); |
1680 | |
1681 | sz += thread_status_size; |
1682 | |
1683 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
1684 | if (!phdr4note) |
1685 | goto end_coredump; |
1686 | |
1687 | fill_elf_note_phdr(phdr4note, sz, offset); |
1688 | offset += sz; |
1689 | } |
1690 | |
1691 | /* Page-align dumped data */ |
1692 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); |
1693 | |
1694 | offset += elf_core_vma_data_size(cprm->mm_flags); |
1695 | offset += elf_core_extra_data_size(); |
1696 | e_shoff = offset; |
1697 | |
1698 | if (e_phnum == PN_XNUM) { |
1699 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); |
1700 | if (!shdr4extnum) |
1701 | goto end_coredump; |
1702 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs); |
1703 | } |
1704 | |
1705 | offset = dataoff; |
1706 | |
1707 | if (!dump_emit(cprm, elf, sizeof(*elf))) |
1708 | goto end_coredump; |
1709 | |
1710 | if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) |
1711 | goto end_coredump; |
1712 | |
1713 | /* write program headers for segments dump */ |
1714 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
1715 | struct elf_phdr phdr; |
1716 | size_t sz; |
1717 | |
1718 | sz = vma->vm_end - vma->vm_start; |
1719 | |
1720 | phdr.p_type = PT_LOAD; |
1721 | phdr.p_offset = offset; |
1722 | phdr.p_vaddr = vma->vm_start; |
1723 | phdr.p_paddr = 0; |
1724 | phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0; |
1725 | phdr.p_memsz = sz; |
1726 | offset += phdr.p_filesz; |
1727 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; |
1728 | if (vma->vm_flags & VM_WRITE) |
1729 | phdr.p_flags |= PF_W; |
1730 | if (vma->vm_flags & VM_EXEC) |
1731 | phdr.p_flags |= PF_X; |
1732 | phdr.p_align = ELF_EXEC_PAGESIZE; |
1733 | |
1734 | if (!dump_emit(cprm, &phdr, sizeof(phdr))) |
1735 | goto end_coredump; |
1736 | } |
1737 | |
1738 | if (!elf_core_write_extra_phdrs(cprm, offset)) |
1739 | goto end_coredump; |
1740 | |
1741 | /* write out the notes section */ |
1742 | for (i = 0; i < numnote; i++) |
1743 | if (!writenote(notes + i, cprm)) |
1744 | goto end_coredump; |
1745 | |
1746 | /* write out the thread status notes section */ |
1747 | list_for_each(t, &thread_list) { |
1748 | struct elf_thread_status *tmp = |
1749 | list_entry(t, struct elf_thread_status, list); |
1750 | |
1751 | for (i = 0; i < tmp->num_notes; i++) |
1752 | if (!writenote(&tmp->notes[i], cprm)) |
1753 | goto end_coredump; |
1754 | } |
1755 | |
1756 | if (!dump_skip(cprm, dataoff - cprm->pos)) |
1757 | goto end_coredump; |
1758 | |
1759 | if (!elf_fdpic_dump_segments(cprm)) |
1760 | goto end_coredump; |
1761 | |
1762 | if (!elf_core_write_extra_data(cprm)) |
1763 | goto end_coredump; |
1764 | |
1765 | if (e_phnum == PN_XNUM) { |
1766 | if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) |
1767 | goto end_coredump; |
1768 | } |
1769 | |
1770 | if (cprm->file->f_pos != offset) { |
1771 | /* Sanity check */ |
1772 | printk(KERN_WARNING |
1773 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", |
1774 | cprm->file->f_pos, offset); |
1775 | } |
1776 | |
1777 | end_coredump: |
1778 | set_fs(fs); |
1779 | |
1780 | cleanup: |
1781 | while (!list_empty(&thread_list)) { |
1782 | struct list_head *tmp = thread_list.next; |
1783 | list_del(tmp); |
1784 | kfree(list_entry(tmp, struct elf_thread_status, list)); |
1785 | } |
1786 | kfree(phdr4note); |
1787 | kfree(elf); |
1788 | kfree(prstatus); |
1789 | kfree(psinfo); |
1790 | kfree(notes); |
1791 | kfree(fpu); |
1792 | kfree(shdr4extnum); |
1793 | #ifdef ELF_CORE_COPY_XFPREGS |
1794 | kfree(xfpu); |
1795 | #endif |
1796 | return has_dumped; |
1797 | #undef NUM_NOTES |
1798 | } |
1799 | |
1800 | #endif /* CONFIG_ELF_CORE */ |
1801 |