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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 *); | |
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 | register_binfmt(&elf_fdpic_format); | |
95 | return 0; | |
96 | } | |
97 | ||
98 | static void __exit exit_elf_fdpic_binfmt(void) | |
99 | { | |
100 | unregister_binfmt(&elf_fdpic_format); | |
101 | } | |
102 | ||
103 | core_initcall(init_elf_fdpic_binfmt); | |
104 | module_exit(exit_elf_fdpic_binfmt); | |
105 | ||
106 | static int is_elf_fdpic(struct elfhdr *hdr, struct file *file) | |
107 | { | |
108 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) | |
109 | return 0; | |
110 | if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) | |
111 | return 0; | |
112 | if (!elf_check_arch(hdr) || !elf_check_fdpic(hdr)) | |
113 | return 0; | |
114 | if (!file->f_op->mmap) | |
115 | return 0; | |
116 | return 1; | |
117 | } | |
118 | ||
119 | /*****************************************************************************/ | |
120 | /* | |
121 | * read the program headers table into memory | |
122 | */ | |
123 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, | |
124 | struct file *file) | |
125 | { | |
126 | struct elf32_phdr *phdr; | |
127 | unsigned long size; | |
128 | int retval, loop; | |
129 | ||
130 | if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) | |
131 | return -ENOMEM; | |
132 | if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) | |
133 | return -ENOMEM; | |
134 | ||
135 | size = params->hdr.e_phnum * sizeof(struct elf_phdr); | |
136 | params->phdrs = kmalloc(size, GFP_KERNEL); | |
137 | if (!params->phdrs) | |
138 | return -ENOMEM; | |
139 | ||
140 | retval = kernel_read(file, params->hdr.e_phoff, | |
141 | (char *) params->phdrs, size); | |
142 | if (unlikely(retval != size)) | |
143 | return retval < 0 ? retval : -ENOEXEC; | |
144 | ||
145 | /* determine stack size for this binary */ | |
146 | phdr = params->phdrs; | |
147 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
148 | if (phdr->p_type != PT_GNU_STACK) | |
149 | continue; | |
150 | ||
151 | if (phdr->p_flags & PF_X) | |
152 | params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; | |
153 | else | |
154 | params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; | |
155 | ||
156 | params->stack_size = phdr->p_memsz; | |
157 | break; | |
158 | } | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | /*****************************************************************************/ | |
164 | /* | |
165 | * load an fdpic binary into various bits of memory | |
166 | */ | |
167 | static int load_elf_fdpic_binary(struct linux_binprm *bprm) | |
168 | { | |
169 | struct elf_fdpic_params exec_params, interp_params; | |
170 | struct pt_regs *regs = current_pt_regs(); | |
171 | struct elf_phdr *phdr; | |
172 | unsigned long stack_size, entryaddr; | |
173 | #ifdef ELF_FDPIC_PLAT_INIT | |
174 | unsigned long dynaddr; | |
175 | #endif | |
176 | #ifndef CONFIG_MMU | |
177 | unsigned long stack_prot; | |
178 | #endif | |
179 | struct file *interpreter = NULL; /* to shut gcc up */ | |
180 | char *interpreter_name = NULL; | |
181 | int executable_stack; | |
182 | int retval, i; | |
183 | ||
184 | kdebug("____ LOAD %d ____", current->pid); | |
185 | ||
186 | memset(&exec_params, 0, sizeof(exec_params)); | |
187 | memset(&interp_params, 0, sizeof(interp_params)); | |
188 | ||
189 | exec_params.hdr = *(struct elfhdr *) bprm->buf; | |
190 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; | |
191 | ||
192 | /* check that this is a binary we know how to deal with */ | |
193 | retval = -ENOEXEC; | |
194 | if (!is_elf_fdpic(&exec_params.hdr, bprm->file)) | |
195 | goto error; | |
196 | ||
197 | /* read the program header table */ | |
198 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); | |
199 | if (retval < 0) | |
200 | goto error; | |
201 | ||
202 | /* scan for a program header that specifies an interpreter */ | |
203 | phdr = exec_params.phdrs; | |
204 | ||
205 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { | |
206 | switch (phdr->p_type) { | |
207 | case PT_INTERP: | |
208 | retval = -ENOMEM; | |
209 | if (phdr->p_filesz > PATH_MAX) | |
210 | goto error; | |
211 | retval = -ENOENT; | |
212 | if (phdr->p_filesz < 2) | |
213 | goto error; | |
214 | ||
215 | /* read the name of the interpreter into memory */ | |
216 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); | |
217 | if (!interpreter_name) | |
218 | goto error; | |
219 | ||
220 | retval = kernel_read(bprm->file, | |
221 | phdr->p_offset, | |
222 | interpreter_name, | |
223 | phdr->p_filesz); | |
224 | if (unlikely(retval != phdr->p_filesz)) { | |
225 | if (retval >= 0) | |
226 | retval = -ENOEXEC; | |
227 | goto error; | |
228 | } | |
229 | ||
230 | retval = -ENOENT; | |
231 | if (interpreter_name[phdr->p_filesz - 1] != '\0') | |
232 | goto error; | |
233 | ||
234 | kdebug("Using ELF interpreter %s", interpreter_name); | |
235 | ||
236 | /* replace the program with the interpreter */ | |
237 | interpreter = open_exec(interpreter_name); | |
238 | retval = PTR_ERR(interpreter); | |
239 | if (IS_ERR(interpreter)) { | |
240 | interpreter = NULL; | |
241 | goto error; | |
242 | } | |
243 | ||
244 | /* | |
245 | * If the binary is not readable then enforce | |
246 | * mm->dumpable = 0 regardless of the interpreter's | |
247 | * permissions. | |
248 | */ | |
249 | would_dump(bprm, interpreter); | |
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 | #ifdef CONFIG_MMU | |
339 | elf_fdpic_arch_lay_out_mm(&exec_params, | |
340 | &interp_params, | |
341 | ¤t->mm->start_stack, | |
342 | ¤t->mm->start_brk); | |
343 | ||
344 | retval = setup_arg_pages(bprm, current->mm->start_stack, | |
345 | executable_stack); | |
346 | if (retval < 0) { | |
347 | send_sig(SIGKILL, current, 0); | |
348 | goto error_kill; | |
349 | } | |
350 | #endif | |
351 | ||
352 | /* load the executable and interpreter into memory */ | |
353 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, | |
354 | "executable"); | |
355 | if (retval < 0) | |
356 | goto error_kill; | |
357 | ||
358 | if (interpreter_name) { | |
359 | retval = elf_fdpic_map_file(&interp_params, interpreter, | |
360 | current->mm, "interpreter"); | |
361 | if (retval < 0) { | |
362 | printk(KERN_ERR "Unable to load interpreter\n"); | |
363 | goto error_kill; | |
364 | } | |
365 | ||
366 | allow_write_access(interpreter); | |
367 | fput(interpreter); | |
368 | interpreter = NULL; | |
369 | } | |
370 | ||
371 | #ifdef CONFIG_MMU | |
372 | if (!current->mm->start_brk) | |
373 | current->mm->start_brk = current->mm->end_data; | |
374 | ||
375 | current->mm->brk = current->mm->start_brk = | |
376 | PAGE_ALIGN(current->mm->start_brk); | |
377 | ||
378 | #else | |
379 | /* create a stack and brk area big enough for everyone | |
380 | * - the brk heap starts at the bottom and works up | |
381 | * - the stack starts at the top and works down | |
382 | */ | |
383 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; | |
384 | if (stack_size < PAGE_SIZE * 2) | |
385 | stack_size = PAGE_SIZE * 2; | |
386 | ||
387 | stack_prot = PROT_READ | PROT_WRITE; | |
388 | if (executable_stack == EXSTACK_ENABLE_X || | |
389 | (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC)) | |
390 | stack_prot |= PROT_EXEC; | |
391 | ||
392 | current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot, | |
393 | MAP_PRIVATE | MAP_ANONYMOUS | | |
394 | MAP_UNINITIALIZED | MAP_GROWSDOWN, | |
395 | 0); | |
396 | ||
397 | if (IS_ERR_VALUE(current->mm->start_brk)) { | |
398 | retval = current->mm->start_brk; | |
399 | current->mm->start_brk = 0; | |
400 | goto error_kill; | |
401 | } | |
402 | ||
403 | current->mm->brk = current->mm->start_brk; | |
404 | current->mm->context.end_brk = current->mm->start_brk; | |
405 | current->mm->context.end_brk += | |
406 | (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0; | |
407 | current->mm->start_stack = current->mm->start_brk + stack_size; | |
408 | #endif | |
409 | ||
410 | install_exec_creds(bprm); | |
411 | if (create_elf_fdpic_tables(bprm, current->mm, | |
412 | &exec_params, &interp_params) < 0) | |
413 | goto error_kill; | |
414 | ||
415 | kdebug("- start_code %lx", current->mm->start_code); | |
416 | kdebug("- end_code %lx", current->mm->end_code); | |
417 | kdebug("- start_data %lx", current->mm->start_data); | |
418 | kdebug("- end_data %lx", current->mm->end_data); | |
419 | kdebug("- start_brk %lx", current->mm->start_brk); | |
420 | kdebug("- brk %lx", current->mm->brk); | |
421 | kdebug("- start_stack %lx", current->mm->start_stack); | |
422 | ||
423 | #ifdef ELF_FDPIC_PLAT_INIT | |
424 | /* | |
425 | * The ABI may specify that certain registers be set up in special | |
426 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
427 | * example. This macro performs whatever initialization to | |
428 | * the regs structure is required. | |
429 | */ | |
430 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; | |
431 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, | |
432 | dynaddr); | |
433 | #endif | |
434 | ||
435 | /* everything is now ready... get the userspace context ready to roll */ | |
436 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; | |
437 | start_thread(regs, entryaddr, current->mm->start_stack); | |
438 | ||
439 | retval = 0; | |
440 | ||
441 | error: | |
442 | if (interpreter) { | |
443 | allow_write_access(interpreter); | |
444 | fput(interpreter); | |
445 | } | |
446 | kfree(interpreter_name); | |
447 | kfree(exec_params.phdrs); | |
448 | kfree(exec_params.loadmap); | |
449 | kfree(interp_params.phdrs); | |
450 | kfree(interp_params.loadmap); | |
451 | return retval; | |
452 | ||
453 | /* unrecoverable error - kill the process */ | |
454 | error_kill: | |
455 | send_sig(SIGSEGV, current, 0); | |
456 | goto error; | |
457 | ||
458 | } | |
459 | ||
460 | /*****************************************************************************/ | |
461 | ||
462 | #ifndef ELF_BASE_PLATFORM | |
463 | /* | |
464 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. | |
465 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value | |
466 | * will be copied to the user stack in the same manner as AT_PLATFORM. | |
467 | */ | |
468 | #define ELF_BASE_PLATFORM NULL | |
469 | #endif | |
470 | ||
471 | /* | |
472 | * present useful information to the program by shovelling it onto the new | |
473 | * process's stack | |
474 | */ | |
475 | static int create_elf_fdpic_tables(struct linux_binprm *bprm, | |
476 | struct mm_struct *mm, | |
477 | struct elf_fdpic_params *exec_params, | |
478 | struct elf_fdpic_params *interp_params) | |
479 | { | |
480 | const struct cred *cred = current_cred(); | |
481 | unsigned long sp, csp, nitems; | |
482 | elf_caddr_t __user *argv, *envp; | |
483 | size_t platform_len = 0, len; | |
484 | char *k_platform, *k_base_platform; | |
485 | char __user *u_platform, *u_base_platform, *p; | |
486 | int loop; | |
487 | int nr; /* reset for each csp adjustment */ | |
488 | ||
489 | #ifdef CONFIG_MMU | |
490 | /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions | |
491 | * by the processes running on the same package. One thing we can do is | |
492 | * to shuffle the initial stack for them, so we give the architecture | |
493 | * an opportunity to do so here. | |
494 | */ | |
495 | sp = arch_align_stack(bprm->p); | |
496 | #else | |
497 | sp = mm->start_stack; | |
498 | ||
499 | /* stack the program arguments and environment */ | |
500 | if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0) | |
501 | return -EFAULT; | |
502 | #endif | |
503 | ||
504 | /* | |
505 | * If this architecture has a platform capability string, copy it | |
506 | * to userspace. In some cases (Sparc), this info is impossible | |
507 | * for userspace to get any other way, in others (i386) it is | |
508 | * merely difficult. | |
509 | */ | |
510 | k_platform = ELF_PLATFORM; | |
511 | u_platform = NULL; | |
512 | ||
513 | if (k_platform) { | |
514 | platform_len = strlen(k_platform) + 1; | |
515 | sp -= platform_len; | |
516 | u_platform = (char __user *) sp; | |
517 | if (__copy_to_user(u_platform, k_platform, platform_len) != 0) | |
518 | return -EFAULT; | |
519 | } | |
520 | ||
521 | /* | |
522 | * If this architecture has a "base" platform capability | |
523 | * string, copy it to userspace. | |
524 | */ | |
525 | k_base_platform = ELF_BASE_PLATFORM; | |
526 | u_base_platform = NULL; | |
527 | ||
528 | if (k_base_platform) { | |
529 | platform_len = strlen(k_base_platform) + 1; | |
530 | sp -= platform_len; | |
531 | u_base_platform = (char __user *) sp; | |
532 | if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0) | |
533 | return -EFAULT; | |
534 | } | |
535 | ||
536 | sp &= ~7UL; | |
537 | ||
538 | /* stack the load map(s) */ | |
539 | len = sizeof(struct elf32_fdpic_loadmap); | |
540 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; | |
541 | sp = (sp - len) & ~7UL; | |
542 | exec_params->map_addr = sp; | |
543 | ||
544 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) | |
545 | return -EFAULT; | |
546 | ||
547 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; | |
548 | ||
549 | if (interp_params->loadmap) { | |
550 | len = sizeof(struct elf32_fdpic_loadmap); | |
551 | len += sizeof(struct elf32_fdpic_loadseg) * | |
552 | interp_params->loadmap->nsegs; | |
553 | sp = (sp - len) & ~7UL; | |
554 | interp_params->map_addr = sp; | |
555 | ||
556 | if (copy_to_user((void __user *) sp, interp_params->loadmap, | |
557 | len) != 0) | |
558 | return -EFAULT; | |
559 | ||
560 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; | |
561 | } | |
562 | ||
563 | /* force 16 byte _final_ alignment here for generality */ | |
564 | #define DLINFO_ITEMS 15 | |
565 | ||
566 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + | |
567 | (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH; | |
568 | ||
569 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) | |
570 | nitems++; | |
571 | ||
572 | csp = sp; | |
573 | sp -= nitems * 2 * sizeof(unsigned long); | |
574 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ | |
575 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ | |
576 | sp -= 1 * sizeof(unsigned long); /* argc */ | |
577 | ||
578 | csp -= sp & 15UL; | |
579 | sp -= sp & 15UL; | |
580 | ||
581 | /* put the ELF interpreter info on the stack */ | |
582 | #define NEW_AUX_ENT(id, val) \ | |
583 | do { \ | |
584 | struct { unsigned long _id, _val; } __user *ent; \ | |
585 | \ | |
586 | ent = (void __user *) csp; \ | |
587 | __put_user((id), &ent[nr]._id); \ | |
588 | __put_user((val), &ent[nr]._val); \ | |
589 | nr++; \ | |
590 | } while (0) | |
591 | ||
592 | nr = 0; | |
593 | csp -= 2 * sizeof(unsigned long); | |
594 | NEW_AUX_ENT(AT_NULL, 0); | |
595 | if (k_platform) { | |
596 | nr = 0; | |
597 | csp -= 2 * sizeof(unsigned long); | |
598 | NEW_AUX_ENT(AT_PLATFORM, | |
599 | (elf_addr_t) (unsigned long) u_platform); | |
600 | } | |
601 | ||
602 | if (k_base_platform) { | |
603 | nr = 0; | |
604 | csp -= 2 * sizeof(unsigned long); | |
605 | NEW_AUX_ENT(AT_BASE_PLATFORM, | |
606 | (elf_addr_t) (unsigned long) u_base_platform); | |
607 | } | |
608 | ||
609 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { | |
610 | nr = 0; | |
611 | csp -= 2 * sizeof(unsigned long); | |
612 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); | |
613 | } | |
614 | ||
615 | nr = 0; | |
616 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); | |
617 | NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP); | |
618 | #ifdef ELF_HWCAP2 | |
619 | NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2); | |
620 | #endif | |
621 | NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE); | |
622 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
623 | NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr); | |
624 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); | |
625 | NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum); | |
626 | NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr); | |
627 | NEW_AUX_ENT(AT_FLAGS, 0); | |
628 | NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr); | |
629 | NEW_AUX_ENT(AT_UID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid)); | |
630 | NEW_AUX_ENT(AT_EUID, (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid)); | |
631 | NEW_AUX_ENT(AT_GID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid)); | |
632 | NEW_AUX_ENT(AT_EGID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid)); | |
633 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); | |
634 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); | |
635 | ||
636 | #ifdef ARCH_DLINFO | |
637 | nr = 0; | |
638 | csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long); | |
639 | ||
640 | /* ARCH_DLINFO must come last so platform specific code can enforce | |
641 | * special alignment requirements on the AUXV if necessary (eg. PPC). | |
642 | */ | |
643 | ARCH_DLINFO; | |
644 | #endif | |
645 | #undef NEW_AUX_ENT | |
646 | ||
647 | /* allocate room for argv[] and envv[] */ | |
648 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); | |
649 | envp = (elf_caddr_t __user *) csp; | |
650 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); | |
651 | argv = (elf_caddr_t __user *) csp; | |
652 | ||
653 | /* stack argc */ | |
654 | csp -= sizeof(unsigned long); | |
655 | __put_user(bprm->argc, (unsigned long __user *) csp); | |
656 | ||
657 | BUG_ON(csp != sp); | |
658 | ||
659 | /* fill in the argv[] array */ | |
660 | #ifdef CONFIG_MMU | |
661 | current->mm->arg_start = bprm->p; | |
662 | #else | |
663 | current->mm->arg_start = current->mm->start_stack - | |
664 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); | |
665 | #endif | |
666 | ||
667 | p = (char __user *) current->mm->arg_start; | |
668 | for (loop = bprm->argc; loop > 0; loop--) { | |
669 | __put_user((elf_caddr_t) p, argv++); | |
670 | len = strnlen_user(p, MAX_ARG_STRLEN); | |
671 | if (!len || len > MAX_ARG_STRLEN) | |
672 | return -EINVAL; | |
673 | p += len; | |
674 | } | |
675 | __put_user(NULL, argv); | |
676 | current->mm->arg_end = (unsigned long) p; | |
677 | ||
678 | /* fill in the envv[] array */ | |
679 | current->mm->env_start = (unsigned long) p; | |
680 | for (loop = bprm->envc; loop > 0; loop--) { | |
681 | __put_user((elf_caddr_t)(unsigned long) p, envp++); | |
682 | len = strnlen_user(p, MAX_ARG_STRLEN); | |
683 | if (!len || len > MAX_ARG_STRLEN) | |
684 | return -EINVAL; | |
685 | p += len; | |
686 | } | |
687 | __put_user(NULL, envp); | |
688 | current->mm->env_end = (unsigned long) p; | |
689 | ||
690 | mm->start_stack = (unsigned long) sp; | |
691 | return 0; | |
692 | } | |
693 | ||
694 | /*****************************************************************************/ | |
695 | /* | |
696 | * transfer the program arguments and environment from the holding pages onto | |
697 | * the stack | |
698 | */ | |
699 | #ifndef CONFIG_MMU | |
700 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm, | |
701 | unsigned long *_sp) | |
702 | { | |
703 | unsigned long index, stop, sp; | |
704 | char *src; | |
705 | int ret = 0; | |
706 | ||
707 | stop = bprm->p >> PAGE_SHIFT; | |
708 | sp = *_sp; | |
709 | ||
710 | for (index = MAX_ARG_PAGES - 1; index >= stop; index--) { | |
711 | src = kmap(bprm->page[index]); | |
712 | sp -= PAGE_SIZE; | |
713 | if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0) | |
714 | ret = -EFAULT; | |
715 | kunmap(bprm->page[index]); | |
716 | if (ret < 0) | |
717 | goto out; | |
718 | } | |
719 | ||
720 | *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15; | |
721 | ||
722 | out: | |
723 | return ret; | |
724 | } | |
725 | #endif | |
726 | ||
727 | /*****************************************************************************/ | |
728 | /* | |
729 | * load the appropriate binary image (executable or interpreter) into memory | |
730 | * - we assume no MMU is available | |
731 | * - if no other PIC bits are set in params->hdr->e_flags | |
732 | * - we assume that the LOADable segments in the binary are independently relocatable | |
733 | * - we assume R/O executable segments are shareable | |
734 | * - else | |
735 | * - we assume the loadable parts of the image to require fixed displacement | |
736 | * - the image is not shareable | |
737 | */ | |
738 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, | |
739 | struct file *file, | |
740 | struct mm_struct *mm, | |
741 | const char *what) | |
742 | { | |
743 | struct elf32_fdpic_loadmap *loadmap; | |
744 | #ifdef CONFIG_MMU | |
745 | struct elf32_fdpic_loadseg *mseg; | |
746 | #endif | |
747 | struct elf32_fdpic_loadseg *seg; | |
748 | struct elf32_phdr *phdr; | |
749 | unsigned long load_addr, stop; | |
750 | unsigned nloads, tmp; | |
751 | size_t size; | |
752 | int loop, ret; | |
753 | ||
754 | /* allocate a load map table */ | |
755 | nloads = 0; | |
756 | for (loop = 0; loop < params->hdr.e_phnum; loop++) | |
757 | if (params->phdrs[loop].p_type == PT_LOAD) | |
758 | nloads++; | |
759 | ||
760 | if (nloads == 0) | |
761 | return -ELIBBAD; | |
762 | ||
763 | size = sizeof(*loadmap) + nloads * sizeof(*seg); | |
764 | loadmap = kzalloc(size, GFP_KERNEL); | |
765 | if (!loadmap) | |
766 | return -ENOMEM; | |
767 | ||
768 | params->loadmap = loadmap; | |
769 | ||
770 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; | |
771 | loadmap->nsegs = nloads; | |
772 | ||
773 | load_addr = params->load_addr; | |
774 | seg = loadmap->segs; | |
775 | ||
776 | /* map the requested LOADs into the memory space */ | |
777 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
778 | case ELF_FDPIC_FLAG_CONSTDISP: | |
779 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
780 | #ifndef CONFIG_MMU | |
781 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); | |
782 | if (ret < 0) | |
783 | return ret; | |
784 | break; | |
785 | #endif | |
786 | default: | |
787 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); | |
788 | if (ret < 0) | |
789 | return ret; | |
790 | break; | |
791 | } | |
792 | ||
793 | /* map the entry point */ | |
794 | if (params->hdr.e_entry) { | |
795 | seg = loadmap->segs; | |
796 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
797 | if (params->hdr.e_entry >= seg->p_vaddr && | |
798 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { | |
799 | params->entry_addr = | |
800 | (params->hdr.e_entry - seg->p_vaddr) + | |
801 | seg->addr; | |
802 | break; | |
803 | } | |
804 | } | |
805 | } | |
806 | ||
807 | /* determine where the program header table has wound up if mapped */ | |
808 | stop = params->hdr.e_phoff; | |
809 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); | |
810 | phdr = params->phdrs; | |
811 | ||
812 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
813 | if (phdr->p_type != PT_LOAD) | |
814 | continue; | |
815 | ||
816 | if (phdr->p_offset > params->hdr.e_phoff || | |
817 | phdr->p_offset + phdr->p_filesz < stop) | |
818 | continue; | |
819 | ||
820 | seg = loadmap->segs; | |
821 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
822 | if (phdr->p_vaddr >= seg->p_vaddr && | |
823 | phdr->p_vaddr + phdr->p_filesz <= | |
824 | seg->p_vaddr + seg->p_memsz) { | |
825 | params->ph_addr = | |
826 | (phdr->p_vaddr - seg->p_vaddr) + | |
827 | seg->addr + | |
828 | params->hdr.e_phoff - phdr->p_offset; | |
829 | break; | |
830 | } | |
831 | } | |
832 | break; | |
833 | } | |
834 | ||
835 | /* determine where the dynamic section has wound up if there is one */ | |
836 | phdr = params->phdrs; | |
837 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
838 | if (phdr->p_type != PT_DYNAMIC) | |
839 | continue; | |
840 | ||
841 | seg = loadmap->segs; | |
842 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
843 | if (phdr->p_vaddr >= seg->p_vaddr && | |
844 | phdr->p_vaddr + phdr->p_memsz <= | |
845 | seg->p_vaddr + seg->p_memsz) { | |
846 | params->dynamic_addr = | |
847 | (phdr->p_vaddr - seg->p_vaddr) + | |
848 | seg->addr; | |
849 | ||
850 | /* check the dynamic section contains at least | |
851 | * one item, and that the last item is a NULL | |
852 | * entry */ | |
853 | if (phdr->p_memsz == 0 || | |
854 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) | |
855 | goto dynamic_error; | |
856 | ||
857 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); | |
858 | if (((Elf32_Dyn *) | |
859 | params->dynamic_addr)[tmp - 1].d_tag != 0) | |
860 | goto dynamic_error; | |
861 | break; | |
862 | } | |
863 | } | |
864 | break; | |
865 | } | |
866 | ||
867 | /* now elide adjacent segments in the load map on MMU linux | |
868 | * - on uClinux the holes between may actually be filled with system | |
869 | * stuff or stuff from other processes | |
870 | */ | |
871 | #ifdef CONFIG_MMU | |
872 | nloads = loadmap->nsegs; | |
873 | mseg = loadmap->segs; | |
874 | seg = mseg + 1; | |
875 | for (loop = 1; loop < nloads; loop++) { | |
876 | /* see if we have a candidate for merging */ | |
877 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { | |
878 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); | |
879 | if (load_addr == (seg->addr & PAGE_MASK)) { | |
880 | mseg->p_memsz += | |
881 | load_addr - | |
882 | (mseg->addr + mseg->p_memsz); | |
883 | mseg->p_memsz += seg->addr & ~PAGE_MASK; | |
884 | mseg->p_memsz += seg->p_memsz; | |
885 | loadmap->nsegs--; | |
886 | continue; | |
887 | } | |
888 | } | |
889 | ||
890 | mseg++; | |
891 | if (mseg != seg) | |
892 | *mseg = *seg; | |
893 | } | |
894 | #endif | |
895 | ||
896 | kdebug("Mapped Object [%s]:", what); | |
897 | kdebug("- elfhdr : %lx", params->elfhdr_addr); | |
898 | kdebug("- entry : %lx", params->entry_addr); | |
899 | kdebug("- PHDR[] : %lx", params->ph_addr); | |
900 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); | |
901 | seg = loadmap->segs; | |
902 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) | |
903 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", | |
904 | loop, | |
905 | seg->addr, seg->addr + seg->p_memsz - 1, | |
906 | seg->p_vaddr, seg->p_memsz); | |
907 | ||
908 | return 0; | |
909 | ||
910 | dynamic_error: | |
911 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", | |
912 | what, file_inode(file)->i_ino); | |
913 | return -ELIBBAD; | |
914 | } | |
915 | ||
916 | /*****************************************************************************/ | |
917 | /* | |
918 | * map a file with constant displacement under uClinux | |
919 | */ | |
920 | #ifndef CONFIG_MMU | |
921 | static int elf_fdpic_map_file_constdisp_on_uclinux( | |
922 | struct elf_fdpic_params *params, | |
923 | struct file *file, | |
924 | struct mm_struct *mm) | |
925 | { | |
926 | struct elf32_fdpic_loadseg *seg; | |
927 | struct elf32_phdr *phdr; | |
928 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags; | |
929 | int loop, ret; | |
930 | ||
931 | load_addr = params->load_addr; | |
932 | seg = params->loadmap->segs; | |
933 | ||
934 | /* determine the bounds of the contiguous overall allocation we must | |
935 | * make */ | |
936 | phdr = params->phdrs; | |
937 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
938 | if (params->phdrs[loop].p_type != PT_LOAD) | |
939 | continue; | |
940 | ||
941 | if (base > phdr->p_vaddr) | |
942 | base = phdr->p_vaddr; | |
943 | if (top < phdr->p_vaddr + phdr->p_memsz) | |
944 | top = phdr->p_vaddr + phdr->p_memsz; | |
945 | } | |
946 | ||
947 | /* allocate one big anon block for everything */ | |
948 | mflags = MAP_PRIVATE; | |
949 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
950 | mflags |= MAP_EXECUTABLE; | |
951 | ||
952 | maddr = vm_mmap(NULL, load_addr, top - base, | |
953 | PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); | |
954 | if (IS_ERR_VALUE(maddr)) | |
955 | return (int) maddr; | |
956 | ||
957 | if (load_addr != 0) | |
958 | load_addr += PAGE_ALIGN(top - base); | |
959 | ||
960 | /* and then load the file segments into it */ | |
961 | phdr = params->phdrs; | |
962 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
963 | if (params->phdrs[loop].p_type != PT_LOAD) | |
964 | continue; | |
965 | ||
966 | seg->addr = maddr + (phdr->p_vaddr - base); | |
967 | seg->p_vaddr = phdr->p_vaddr; | |
968 | seg->p_memsz = phdr->p_memsz; | |
969 | ||
970 | ret = read_code(file, seg->addr, phdr->p_offset, | |
971 | phdr->p_filesz); | |
972 | if (ret < 0) | |
973 | return ret; | |
974 | ||
975 | /* map the ELF header address if in this segment */ | |
976 | if (phdr->p_offset == 0) | |
977 | params->elfhdr_addr = seg->addr; | |
978 | ||
979 | /* clear any space allocated but not loaded */ | |
980 | if (phdr->p_filesz < phdr->p_memsz) { | |
981 | if (clear_user((void *) (seg->addr + phdr->p_filesz), | |
982 | phdr->p_memsz - phdr->p_filesz)) | |
983 | return -EFAULT; | |
984 | } | |
985 | ||
986 | if (mm) { | |
987 | if (phdr->p_flags & PF_X) { | |
988 | if (!mm->start_code) { | |
989 | mm->start_code = seg->addr; | |
990 | mm->end_code = seg->addr + | |
991 | phdr->p_memsz; | |
992 | } | |
993 | } else if (!mm->start_data) { | |
994 | mm->start_data = seg->addr; | |
995 | mm->end_data = seg->addr + phdr->p_memsz; | |
996 | } | |
997 | } | |
998 | ||
999 | seg++; | |
1000 | } | |
1001 | ||
1002 | return 0; | |
1003 | } | |
1004 | #endif | |
1005 | ||
1006 | /*****************************************************************************/ | |
1007 | /* | |
1008 | * map a binary by direct mmap() of the individual PT_LOAD segments | |
1009 | */ | |
1010 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, | |
1011 | struct file *file, | |
1012 | struct mm_struct *mm) | |
1013 | { | |
1014 | struct elf32_fdpic_loadseg *seg; | |
1015 | struct elf32_phdr *phdr; | |
1016 | unsigned long load_addr, delta_vaddr; | |
1017 | int loop, dvset; | |
1018 | ||
1019 | load_addr = params->load_addr; | |
1020 | delta_vaddr = 0; | |
1021 | dvset = 0; | |
1022 | ||
1023 | seg = params->loadmap->segs; | |
1024 | ||
1025 | /* deal with each load segment separately */ | |
1026 | phdr = params->phdrs; | |
1027 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
1028 | unsigned long maddr, disp, excess, excess1; | |
1029 | int prot = 0, flags; | |
1030 | ||
1031 | if (phdr->p_type != PT_LOAD) | |
1032 | continue; | |
1033 | ||
1034 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", | |
1035 | (unsigned long) phdr->p_vaddr, | |
1036 | (unsigned long) phdr->p_offset, | |
1037 | (unsigned long) phdr->p_filesz, | |
1038 | (unsigned long) phdr->p_memsz); | |
1039 | ||
1040 | /* determine the mapping parameters */ | |
1041 | if (phdr->p_flags & PF_R) prot |= PROT_READ; | |
1042 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; | |
1043 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; | |
1044 | ||
1045 | flags = MAP_PRIVATE | MAP_DENYWRITE; | |
1046 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
1047 | flags |= MAP_EXECUTABLE; | |
1048 | ||
1049 | maddr = 0; | |
1050 | ||
1051 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
1052 | case ELF_FDPIC_FLAG_INDEPENDENT: | |
1053 | /* PT_LOADs are independently locatable */ | |
1054 | break; | |
1055 | ||
1056 | case ELF_FDPIC_FLAG_HONOURVADDR: | |
1057 | /* the specified virtual address must be honoured */ | |
1058 | maddr = phdr->p_vaddr; | |
1059 | flags |= MAP_FIXED; | |
1060 | break; | |
1061 | ||
1062 | case ELF_FDPIC_FLAG_CONSTDISP: | |
1063 | /* constant displacement | |
1064 | * - can be mapped anywhere, but must be mapped as a | |
1065 | * unit | |
1066 | */ | |
1067 | if (!dvset) { | |
1068 | maddr = load_addr; | |
1069 | delta_vaddr = phdr->p_vaddr; | |
1070 | dvset = 1; | |
1071 | } else { | |
1072 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; | |
1073 | flags |= MAP_FIXED; | |
1074 | } | |
1075 | break; | |
1076 | ||
1077 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
1078 | /* contiguity handled later */ | |
1079 | break; | |
1080 | ||
1081 | default: | |
1082 | BUG(); | |
1083 | } | |
1084 | ||
1085 | maddr &= PAGE_MASK; | |
1086 | ||
1087 | /* create the mapping */ | |
1088 | disp = phdr->p_vaddr & ~PAGE_MASK; | |
1089 | maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, | |
1090 | phdr->p_offset - disp); | |
1091 | ||
1092 | kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", | |
1093 | loop, phdr->p_memsz + disp, prot, flags, | |
1094 | phdr->p_offset - disp, maddr); | |
1095 | ||
1096 | if (IS_ERR_VALUE(maddr)) | |
1097 | return (int) maddr; | |
1098 | ||
1099 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == | |
1100 | ELF_FDPIC_FLAG_CONTIGUOUS) | |
1101 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); | |
1102 | ||
1103 | seg->addr = maddr + disp; | |
1104 | seg->p_vaddr = phdr->p_vaddr; | |
1105 | seg->p_memsz = phdr->p_memsz; | |
1106 | ||
1107 | /* map the ELF header address if in this segment */ | |
1108 | if (phdr->p_offset == 0) | |
1109 | params->elfhdr_addr = seg->addr; | |
1110 | ||
1111 | /* clear the bit between beginning of mapping and beginning of | |
1112 | * PT_LOAD */ | |
1113 | if (prot & PROT_WRITE && disp > 0) { | |
1114 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); | |
1115 | if (clear_user((void __user *) maddr, disp)) | |
1116 | return -EFAULT; | |
1117 | maddr += disp; | |
1118 | } | |
1119 | ||
1120 | /* clear any space allocated but not loaded | |
1121 | * - on uClinux we can just clear the lot | |
1122 | * - on MMU linux we'll get a SIGBUS beyond the last page | |
1123 | * extant in the file | |
1124 | */ | |
1125 | excess = phdr->p_memsz - phdr->p_filesz; | |
1126 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); | |
1127 | ||
1128 | #ifdef CONFIG_MMU | |
1129 | if (excess > excess1) { | |
1130 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; | |
1131 | unsigned long xmaddr; | |
1132 | ||
1133 | flags |= MAP_FIXED | MAP_ANONYMOUS; | |
1134 | xmaddr = vm_mmap(NULL, xaddr, excess - excess1, | |
1135 | prot, flags, 0); | |
1136 | ||
1137 | kdebug("mmap[%d] <anon>" | |
1138 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", | |
1139 | loop, xaddr, excess - excess1, prot, flags, | |
1140 | xmaddr); | |
1141 | ||
1142 | if (xmaddr != xaddr) | |
1143 | return -ENOMEM; | |
1144 | } | |
1145 | ||
1146 | if (prot & PROT_WRITE && excess1 > 0) { | |
1147 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1148 | loop, maddr + phdr->p_filesz, excess1); | |
1149 | if (clear_user((void __user *) maddr + phdr->p_filesz, | |
1150 | excess1)) | |
1151 | return -EFAULT; | |
1152 | } | |
1153 | ||
1154 | #else | |
1155 | if (excess > 0) { | |
1156 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1157 | loop, maddr + phdr->p_filesz, excess); | |
1158 | if (clear_user((void *) maddr + phdr->p_filesz, excess)) | |
1159 | return -EFAULT; | |
1160 | } | |
1161 | #endif | |
1162 | ||
1163 | if (mm) { | |
1164 | if (phdr->p_flags & PF_X) { | |
1165 | if (!mm->start_code) { | |
1166 | mm->start_code = maddr; | |
1167 | mm->end_code = maddr + phdr->p_memsz; | |
1168 | } | |
1169 | } else if (!mm->start_data) { | |
1170 | mm->start_data = maddr; | |
1171 | mm->end_data = maddr + phdr->p_memsz; | |
1172 | } | |
1173 | } | |
1174 | ||
1175 | seg++; | |
1176 | } | |
1177 | ||
1178 | return 0; | |
1179 | } | |
1180 | ||
1181 | /*****************************************************************************/ | |
1182 | /* | |
1183 | * ELF-FDPIC core dumper | |
1184 | * | |
1185 | * Modelled on fs/exec.c:aout_core_dump() | |
1186 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1187 | * | |
1188 | * Modelled on fs/binfmt_elf.c core dumper | |
1189 | */ | |
1190 | #ifdef CONFIG_ELF_CORE | |
1191 | ||
1192 | /* | |
1193 | * Decide whether a segment is worth dumping; default is yes to be | |
1194 | * sure (missing info is worse than too much; etc). | |
1195 | * Personally I'd include everything, and use the coredump limit... | |
1196 | * | |
1197 | * I think we should skip something. But I am not sure how. H.J. | |
1198 | */ | |
1199 | static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) | |
1200 | { | |
1201 | int dump_ok; | |
1202 | ||
1203 | /* Do not dump I/O mapped devices or special mappings */ | |
1204 | if (vma->vm_flags & VM_IO) { | |
1205 | kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags); | |
1206 | return 0; | |
1207 | } | |
1208 | ||
1209 | /* If we may not read the contents, don't allow us to dump | |
1210 | * them either. "dump_write()" can't handle it anyway. | |
1211 | */ | |
1212 | if (!(vma->vm_flags & VM_READ)) { | |
1213 | kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags); | |
1214 | return 0; | |
1215 | } | |
1216 | ||
1217 | /* By default, dump shared memory if mapped from an anonymous file. */ | |
1218 | if (vma->vm_flags & VM_SHARED) { | |
1219 | if (file_inode(vma->vm_file)->i_nlink == 0) { | |
1220 | dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags); | |
1221 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, | |
1222 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1223 | return dump_ok; | |
1224 | } | |
1225 | ||
1226 | dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags); | |
1227 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, | |
1228 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1229 | return dump_ok; | |
1230 | } | |
1231 | ||
1232 | #ifdef CONFIG_MMU | |
1233 | /* By default, if it hasn't been written to, don't write it out */ | |
1234 | if (!vma->anon_vma) { | |
1235 | dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags); | |
1236 | kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start, | |
1237 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1238 | return dump_ok; | |
1239 | } | |
1240 | #endif | |
1241 | ||
1242 | dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags); | |
1243 | kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags, | |
1244 | dump_ok ? "yes" : "no"); | |
1245 | return dump_ok; | |
1246 | } | |
1247 | ||
1248 | /* An ELF note in memory */ | |
1249 | struct memelfnote | |
1250 | { | |
1251 | const char *name; | |
1252 | int type; | |
1253 | unsigned int datasz; | |
1254 | void *data; | |
1255 | }; | |
1256 | ||
1257 | static int notesize(struct memelfnote *en) | |
1258 | { | |
1259 | int sz; | |
1260 | ||
1261 | sz = sizeof(struct elf_note); | |
1262 | sz += roundup(strlen(en->name) + 1, 4); | |
1263 | sz += roundup(en->datasz, 4); | |
1264 | ||
1265 | return sz; | |
1266 | } | |
1267 | ||
1268 | /* #define DEBUG */ | |
1269 | ||
1270 | static int writenote(struct memelfnote *men, struct coredump_params *cprm) | |
1271 | { | |
1272 | struct elf_note en; | |
1273 | en.n_namesz = strlen(men->name) + 1; | |
1274 | en.n_descsz = men->datasz; | |
1275 | en.n_type = men->type; | |
1276 | ||
1277 | return dump_emit(cprm, &en, sizeof(en)) && | |
1278 | dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) && | |
1279 | dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4); | |
1280 | } | |
1281 | ||
1282 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) | |
1283 | { | |
1284 | memcpy(elf->e_ident, ELFMAG, SELFMAG); | |
1285 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1286 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1287 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1288 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1289 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); | |
1290 | ||
1291 | elf->e_type = ET_CORE; | |
1292 | elf->e_machine = ELF_ARCH; | |
1293 | elf->e_version = EV_CURRENT; | |
1294 | elf->e_entry = 0; | |
1295 | elf->e_phoff = sizeof(struct elfhdr); | |
1296 | elf->e_shoff = 0; | |
1297 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS; | |
1298 | elf->e_ehsize = sizeof(struct elfhdr); | |
1299 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1300 | elf->e_phnum = segs; | |
1301 | elf->e_shentsize = 0; | |
1302 | elf->e_shnum = 0; | |
1303 | elf->e_shstrndx = 0; | |
1304 | return; | |
1305 | } | |
1306 | ||
1307 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) | |
1308 | { | |
1309 | phdr->p_type = PT_NOTE; | |
1310 | phdr->p_offset = offset; | |
1311 | phdr->p_vaddr = 0; | |
1312 | phdr->p_paddr = 0; | |
1313 | phdr->p_filesz = sz; | |
1314 | phdr->p_memsz = 0; | |
1315 | phdr->p_flags = 0; | |
1316 | phdr->p_align = 0; | |
1317 | return; | |
1318 | } | |
1319 | ||
1320 | static inline void fill_note(struct memelfnote *note, const char *name, int type, | |
1321 | unsigned int sz, void *data) | |
1322 | { | |
1323 | note->name = name; | |
1324 | note->type = type; | |
1325 | note->datasz = sz; | |
1326 | note->data = data; | |
1327 | return; | |
1328 | } | |
1329 | ||
1330 | /* | |
1331 | * fill up all the fields in prstatus from the given task struct, except | |
1332 | * registers which need to be filled up separately. | |
1333 | */ | |
1334 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
1335 | struct task_struct *p, long signr) | |
1336 | { | |
1337 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1338 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1339 | prstatus->pr_sighold = p->blocked.sig[0]; | |
1340 | rcu_read_lock(); | |
1341 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1342 | rcu_read_unlock(); | |
1343 | prstatus->pr_pid = task_pid_vnr(p); | |
1344 | prstatus->pr_pgrp = task_pgrp_vnr(p); | |
1345 | prstatus->pr_sid = task_session_vnr(p); | |
1346 | if (thread_group_leader(p)) { | |
1347 | struct task_cputime cputime; | |
1348 | ||
1349 | /* | |
1350 | * This is the record for the group leader. It shows the | |
1351 | * group-wide total, not its individual thread total. | |
1352 | */ | |
1353 | thread_group_cputime(p, &cputime); | |
1354 | cputime_to_timeval(cputime.utime, &prstatus->pr_utime); | |
1355 | cputime_to_timeval(cputime.stime, &prstatus->pr_stime); | |
1356 | } else { | |
1357 | cputime_t utime, stime; | |
1358 | ||
1359 | task_cputime(p, &utime, &stime); | |
1360 | cputime_to_timeval(utime, &prstatus->pr_utime); | |
1361 | cputime_to_timeval(stime, &prstatus->pr_stime); | |
1362 | } | |
1363 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); | |
1364 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); | |
1365 | ||
1366 | prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; | |
1367 | prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; | |
1368 | } | |
1369 | ||
1370 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1371 | struct mm_struct *mm) | |
1372 | { | |
1373 | const struct cred *cred; | |
1374 | unsigned int i, len; | |
1375 | ||
1376 | /* first copy the parameters from user space */ | |
1377 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1378 | ||
1379 | len = mm->arg_end - mm->arg_start; | |
1380 | if (len >= ELF_PRARGSZ) | |
1381 | len = ELF_PRARGSZ - 1; | |
1382 | if (copy_from_user(&psinfo->pr_psargs, | |
1383 | (const char __user *) mm->arg_start, len)) | |
1384 | return -EFAULT; | |
1385 | for (i = 0; i < len; i++) | |
1386 | if (psinfo->pr_psargs[i] == 0) | |
1387 | psinfo->pr_psargs[i] = ' '; | |
1388 | psinfo->pr_psargs[len] = 0; | |
1389 | ||
1390 | rcu_read_lock(); | |
1391 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1392 | rcu_read_unlock(); | |
1393 | psinfo->pr_pid = task_pid_vnr(p); | |
1394 | psinfo->pr_pgrp = task_pgrp_vnr(p); | |
1395 | psinfo->pr_sid = task_session_vnr(p); | |
1396 | ||
1397 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1398 | psinfo->pr_state = i; | |
1399 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; | |
1400 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; | |
1401 | psinfo->pr_nice = task_nice(p); | |
1402 | psinfo->pr_flag = p->flags; | |
1403 | rcu_read_lock(); | |
1404 | cred = __task_cred(p); | |
1405 | SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid)); | |
1406 | SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid)); | |
1407 | rcu_read_unlock(); | |
1408 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); | |
1409 | ||
1410 | return 0; | |
1411 | } | |
1412 | ||
1413 | /* Here is the structure in which status of each thread is captured. */ | |
1414 | struct elf_thread_status | |
1415 | { | |
1416 | struct list_head list; | |
1417 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1418 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1419 | struct task_struct *thread; | |
1420 | #ifdef ELF_CORE_COPY_XFPREGS | |
1421 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ | |
1422 | #endif | |
1423 | struct memelfnote notes[3]; | |
1424 | int num_notes; | |
1425 | }; | |
1426 | ||
1427 | /* | |
1428 | * In order to add the specific thread information for the elf file format, | |
1429 | * we need to keep a linked list of every thread's pr_status and then create | |
1430 | * a single section for them in the final core file. | |
1431 | */ | |
1432 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1433 | { | |
1434 | struct task_struct *p = t->thread; | |
1435 | int sz = 0; | |
1436 | ||
1437 | t->num_notes = 0; | |
1438 | ||
1439 | fill_prstatus(&t->prstatus, p, signr); | |
1440 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1441 | ||
1442 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), | |
1443 | &t->prstatus); | |
1444 | t->num_notes++; | |
1445 | sz += notesize(&t->notes[0]); | |
1446 | ||
1447 | t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu); | |
1448 | if (t->prstatus.pr_fpvalid) { | |
1449 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1450 | &t->fpu); | |
1451 | t->num_notes++; | |
1452 | sz += notesize(&t->notes[1]); | |
1453 | } | |
1454 | ||
1455 | #ifdef ELF_CORE_COPY_XFPREGS | |
1456 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
1457 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, | |
1458 | sizeof(t->xfpu), &t->xfpu); | |
1459 | t->num_notes++; | |
1460 | sz += notesize(&t->notes[2]); | |
1461 | } | |
1462 | #endif | |
1463 | return sz; | |
1464 | } | |
1465 | ||
1466 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, | |
1467 | elf_addr_t e_shoff, int segs) | |
1468 | { | |
1469 | elf->e_shoff = e_shoff; | |
1470 | elf->e_shentsize = sizeof(*shdr4extnum); | |
1471 | elf->e_shnum = 1; | |
1472 | elf->e_shstrndx = SHN_UNDEF; | |
1473 | ||
1474 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); | |
1475 | ||
1476 | shdr4extnum->sh_type = SHT_NULL; | |
1477 | shdr4extnum->sh_size = elf->e_shnum; | |
1478 | shdr4extnum->sh_link = elf->e_shstrndx; | |
1479 | shdr4extnum->sh_info = segs; | |
1480 | } | |
1481 | ||
1482 | /* | |
1483 | * dump the segments for an MMU process | |
1484 | */ | |
1485 | static bool elf_fdpic_dump_segments(struct coredump_params *cprm) | |
1486 | { | |
1487 | struct vm_area_struct *vma; | |
1488 | ||
1489 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { | |
1490 | unsigned long addr; | |
1491 | ||
1492 | if (!maydump(vma, cprm->mm_flags)) | |
1493 | continue; | |
1494 | ||
1495 | #ifdef CONFIG_MMU | |
1496 | for (addr = vma->vm_start; addr < vma->vm_end; | |
1497 | addr += PAGE_SIZE) { | |
1498 | bool res; | |
1499 | struct page *page = get_dump_page(addr); | |
1500 | if (page) { | |
1501 | void *kaddr = kmap(page); | |
1502 | res = dump_emit(cprm, kaddr, PAGE_SIZE); | |
1503 | kunmap(page); | |
1504 | page_cache_release(page); | |
1505 | } else { | |
1506 | res = dump_skip(cprm, PAGE_SIZE); | |
1507 | } | |
1508 | if (!res) | |
1509 | return false; | |
1510 | } | |
1511 | #else | |
1512 | if (!dump_emit(cprm, (void *) vma->vm_start, | |
1513 | vma->vm_end - vma->vm_start)) | |
1514 | return false; | |
1515 | #endif | |
1516 | } | |
1517 | return true; | |
1518 | } | |
1519 | ||
1520 | static size_t elf_core_vma_data_size(unsigned long mm_flags) | |
1521 | { | |
1522 | struct vm_area_struct *vma; | |
1523 | size_t size = 0; | |
1524 | ||
1525 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) | |
1526 | if (maydump(vma, mm_flags)) | |
1527 | size += vma->vm_end - vma->vm_start; | |
1528 | return size; | |
1529 | } | |
1530 | ||
1531 | /* | |
1532 | * Actual dumper | |
1533 | * | |
1534 | * This is a two-pass process; first we find the offsets of the bits, | |
1535 | * and then they are actually written out. If we run out of core limit | |
1536 | * we just truncate. | |
1537 | */ | |
1538 | static int elf_fdpic_core_dump(struct coredump_params *cprm) | |
1539 | { | |
1540 | #define NUM_NOTES 6 | |
1541 | int has_dumped = 0; | |
1542 | mm_segment_t fs; | |
1543 | int segs; | |
1544 | int i; | |
1545 | struct vm_area_struct *vma; | |
1546 | struct elfhdr *elf = NULL; | |
1547 | loff_t offset = 0, dataoff; | |
1548 | int numnote; | |
1549 | struct memelfnote *notes = NULL; | |
1550 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ | |
1551 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ | |
1552 | LIST_HEAD(thread_list); | |
1553 | struct list_head *t; | |
1554 | elf_fpregset_t *fpu = NULL; | |
1555 | #ifdef ELF_CORE_COPY_XFPREGS | |
1556 | elf_fpxregset_t *xfpu = NULL; | |
1557 | #endif | |
1558 | int thread_status_size = 0; | |
1559 | elf_addr_t *auxv; | |
1560 | struct elf_phdr *phdr4note = NULL; | |
1561 | struct elf_shdr *shdr4extnum = NULL; | |
1562 | Elf_Half e_phnum; | |
1563 | elf_addr_t e_shoff; | |
1564 | struct core_thread *ct; | |
1565 | struct elf_thread_status *tmp; | |
1566 | ||
1567 | /* | |
1568 | * We no longer stop all VM operations. | |
1569 | * | |
1570 | * This is because those proceses that could possibly change map_count | |
1571 | * or the mmap / vma pages are now blocked in do_exit on current | |
1572 | * finishing this core dump. | |
1573 | * | |
1574 | * Only ptrace can touch these memory addresses, but it doesn't change | |
1575 | * the map_count or the pages allocated. So no possibility of crashing | |
1576 | * exists while dumping the mm->vm_next areas to the core file. | |
1577 | */ | |
1578 | ||
1579 | /* alloc memory for large data structures: too large to be on stack */ | |
1580 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
1581 | if (!elf) | |
1582 | goto cleanup; | |
1583 | prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL); | |
1584 | if (!prstatus) | |
1585 | goto cleanup; | |
1586 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
1587 | if (!psinfo) | |
1588 | goto cleanup; | |
1589 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); | |
1590 | if (!notes) | |
1591 | goto cleanup; | |
1592 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); | |
1593 | if (!fpu) | |
1594 | goto cleanup; | |
1595 | #ifdef ELF_CORE_COPY_XFPREGS | |
1596 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); | |
1597 | if (!xfpu) | |
1598 | goto cleanup; | |
1599 | #endif | |
1600 | ||
1601 | for (ct = current->mm->core_state->dumper.next; | |
1602 | ct; ct = ct->next) { | |
1603 | tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); | |
1604 | if (!tmp) | |
1605 | goto cleanup; | |
1606 | ||
1607 | tmp->thread = ct->task; | |
1608 | list_add(&tmp->list, &thread_list); | |
1609 | } | |
1610 | ||
1611 | list_for_each(t, &thread_list) { | |
1612 | struct elf_thread_status *tmp; | |
1613 | int sz; | |
1614 | ||
1615 | tmp = list_entry(t, struct elf_thread_status, list); | |
1616 | sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp); | |
1617 | thread_status_size += sz; | |
1618 | } | |
1619 | ||
1620 | /* now collect the dump for the current */ | |
1621 | fill_prstatus(prstatus, current, cprm->siginfo->si_signo); | |
1622 | elf_core_copy_regs(&prstatus->pr_reg, cprm->regs); | |
1623 | ||
1624 | segs = current->mm->map_count; | |
1625 | segs += elf_core_extra_phdrs(); | |
1626 | ||
1627 | /* for notes section */ | |
1628 | segs++; | |
1629 | ||
1630 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid | |
1631 | * this, kernel supports extended numbering. Have a look at | |
1632 | * include/linux/elf.h for further information. */ | |
1633 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; | |
1634 | ||
1635 | /* Set up header */ | |
1636 | fill_elf_fdpic_header(elf, e_phnum); | |
1637 | ||
1638 | has_dumped = 1; | |
1639 | /* | |
1640 | * Set up the notes in similar form to SVR4 core dumps made | |
1641 | * with info from their /proc. | |
1642 | */ | |
1643 | ||
1644 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); | |
1645 | fill_psinfo(psinfo, current->group_leader, current->mm); | |
1646 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); | |
1647 | ||
1648 | numnote = 2; | |
1649 | ||
1650 | auxv = (elf_addr_t *) current->mm->saved_auxv; | |
1651 | ||
1652 | i = 0; | |
1653 | do | |
1654 | i += 2; | |
1655 | while (auxv[i - 2] != AT_NULL); | |
1656 | fill_note(¬es[numnote++], "CORE", NT_AUXV, | |
1657 | i * sizeof(elf_addr_t), auxv); | |
1658 | ||
1659 | /* Try to dump the FPU. */ | |
1660 | if ((prstatus->pr_fpvalid = | |
1661 | elf_core_copy_task_fpregs(current, cprm->regs, fpu))) | |
1662 | fill_note(notes + numnote++, | |
1663 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); | |
1664 | #ifdef ELF_CORE_COPY_XFPREGS | |
1665 | if (elf_core_copy_task_xfpregs(current, xfpu)) | |
1666 | fill_note(notes + numnote++, | |
1667 | "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu); | |
1668 | #endif | |
1669 | ||
1670 | fs = get_fs(); | |
1671 | set_fs(KERNEL_DS); | |
1672 | ||
1673 | offset += sizeof(*elf); /* Elf header */ | |
1674 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ | |
1675 | ||
1676 | /* Write notes phdr entry */ | |
1677 | { | |
1678 | int sz = 0; | |
1679 | ||
1680 | for (i = 0; i < numnote; i++) | |
1681 | sz += notesize(notes + i); | |
1682 | ||
1683 | sz += thread_status_size; | |
1684 | ||
1685 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); | |
1686 | if (!phdr4note) | |
1687 | goto end_coredump; | |
1688 | ||
1689 | fill_elf_note_phdr(phdr4note, sz, offset); | |
1690 | offset += sz; | |
1691 | } | |
1692 | ||
1693 | /* Page-align dumped data */ | |
1694 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); | |
1695 | ||
1696 | offset += elf_core_vma_data_size(cprm->mm_flags); | |
1697 | offset += elf_core_extra_data_size(); | |
1698 | e_shoff = offset; | |
1699 | ||
1700 | if (e_phnum == PN_XNUM) { | |
1701 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); | |
1702 | if (!shdr4extnum) | |
1703 | goto end_coredump; | |
1704 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs); | |
1705 | } | |
1706 | ||
1707 | offset = dataoff; | |
1708 | ||
1709 | if (!dump_emit(cprm, elf, sizeof(*elf))) | |
1710 | goto end_coredump; | |
1711 | ||
1712 | if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note))) | |
1713 | goto end_coredump; | |
1714 | ||
1715 | /* write program headers for segments dump */ | |
1716 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { | |
1717 | struct elf_phdr phdr; | |
1718 | size_t sz; | |
1719 | ||
1720 | sz = vma->vm_end - vma->vm_start; | |
1721 | ||
1722 | phdr.p_type = PT_LOAD; | |
1723 | phdr.p_offset = offset; | |
1724 | phdr.p_vaddr = vma->vm_start; | |
1725 | phdr.p_paddr = 0; | |
1726 | phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0; | |
1727 | phdr.p_memsz = sz; | |
1728 | offset += phdr.p_filesz; | |
1729 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
1730 | if (vma->vm_flags & VM_WRITE) | |
1731 | phdr.p_flags |= PF_W; | |
1732 | if (vma->vm_flags & VM_EXEC) | |
1733 | phdr.p_flags |= PF_X; | |
1734 | phdr.p_align = ELF_EXEC_PAGESIZE; | |
1735 | ||
1736 | if (!dump_emit(cprm, &phdr, sizeof(phdr))) | |
1737 | goto end_coredump; | |
1738 | } | |
1739 | ||
1740 | if (!elf_core_write_extra_phdrs(cprm, offset)) | |
1741 | goto end_coredump; | |
1742 | ||
1743 | /* write out the notes section */ | |
1744 | for (i = 0; i < numnote; i++) | |
1745 | if (!writenote(notes + i, cprm)) | |
1746 | goto end_coredump; | |
1747 | ||
1748 | /* write out the thread status notes section */ | |
1749 | list_for_each(t, &thread_list) { | |
1750 | struct elf_thread_status *tmp = | |
1751 | list_entry(t, struct elf_thread_status, list); | |
1752 | ||
1753 | for (i = 0; i < tmp->num_notes; i++) | |
1754 | if (!writenote(&tmp->notes[i], cprm)) | |
1755 | goto end_coredump; | |
1756 | } | |
1757 | ||
1758 | if (!dump_skip(cprm, dataoff - cprm->written)) | |
1759 | goto end_coredump; | |
1760 | ||
1761 | if (!elf_fdpic_dump_segments(cprm)) | |
1762 | goto end_coredump; | |
1763 | ||
1764 | if (!elf_core_write_extra_data(cprm)) | |
1765 | goto end_coredump; | |
1766 | ||
1767 | if (e_phnum == PN_XNUM) { | |
1768 | if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum))) | |
1769 | goto end_coredump; | |
1770 | } | |
1771 | ||
1772 | if (cprm->file->f_pos != offset) { | |
1773 | /* Sanity check */ | |
1774 | printk(KERN_WARNING | |
1775 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", | |
1776 | cprm->file->f_pos, offset); | |
1777 | } | |
1778 | ||
1779 | end_coredump: | |
1780 | set_fs(fs); | |
1781 | ||
1782 | cleanup: | |
1783 | while (!list_empty(&thread_list)) { | |
1784 | struct list_head *tmp = thread_list.next; | |
1785 | list_del(tmp); | |
1786 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
1787 | } | |
1788 | kfree(phdr4note); | |
1789 | kfree(elf); | |
1790 | kfree(prstatus); | |
1791 | kfree(psinfo); | |
1792 | kfree(notes); | |
1793 | kfree(fpu); | |
1794 | kfree(shdr4extnum); | |
1795 | #ifdef ELF_CORE_COPY_XFPREGS | |
1796 | kfree(xfpu); | |
1797 | #endif | |
1798 | return has_dumped; | |
1799 | #undef NUM_NOTES | |
1800 | } | |
1801 | ||
1802 | #endif /* CONFIG_ELF_CORE */ |