Commit | Line | Data |
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1da177e4 LT |
1 | /* binfmt_elf_fdpic.c: FDPIC ELF binary format |
2 | * | |
8a2ab7f5 | 3 | * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved. |
1da177e4 LT |
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> | |
6d8c4e3b | 27 | #include <linux/pagemap.h> |
5edc2a51 | 28 | #include <linux/security.h> |
1da177e4 | 29 | #include <linux/highmem.h> |
6d8c4e3b | 30 | #include <linux/highuid.h> |
1da177e4 LT |
31 | #include <linux/personality.h> |
32 | #include <linux/ptrace.h> | |
33 | #include <linux/init.h> | |
1da177e4 LT |
34 | #include <linux/elf.h> |
35 | #include <linux/elf-fdpic.h> | |
36 | #include <linux/elfcore.h> | |
37 | ||
38 | #include <asm/uaccess.h> | |
39 | #include <asm/param.h> | |
40 | #include <asm/pgalloc.h> | |
41 | ||
42 | typedef char *elf_caddr_t; | |
1da177e4 LT |
43 | |
44 | #if 0 | |
45 | #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) | |
46 | #else | |
47 | #define kdebug(fmt, ...) do {} while(0) | |
48 | #endif | |
49 | ||
6d8c4e3b DH |
50 | #if 0 |
51 | #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) | |
52 | #else | |
53 | #define kdcore(fmt, ...) do {} while(0) | |
54 | #endif | |
55 | ||
1da177e4 LT |
56 | MODULE_LICENSE("GPL"); |
57 | ||
8a2ab7f5 DH |
58 | static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *); |
59 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); | |
60 | static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, | |
61 | struct mm_struct *, const char *); | |
1da177e4 | 62 | |
8a2ab7f5 DH |
63 | static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, |
64 | struct elf_fdpic_params *, | |
65 | struct elf_fdpic_params *); | |
1da177e4 LT |
66 | |
67 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
68 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *, |
69 | unsigned long *); | |
70 | static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *, | |
71 | struct file *, | |
72 | struct mm_struct *); | |
1da177e4 LT |
73 | #endif |
74 | ||
8a2ab7f5 DH |
75 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, |
76 | struct file *, struct mm_struct *); | |
1da177e4 | 77 | |
6d8c4e3b | 78 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
7dc0b22e | 79 | static int elf_fdpic_core_dump(long, struct pt_regs *, struct file *, unsigned long limit); |
6d8c4e3b DH |
80 | #endif |
81 | ||
1da177e4 LT |
82 | static struct linux_binfmt elf_fdpic_format = { |
83 | .module = THIS_MODULE, | |
84 | .load_binary = load_elf_fdpic_binary, | |
6d8c4e3b DH |
85 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
86 | .core_dump = elf_fdpic_core_dump, | |
87 | #endif | |
1da177e4 LT |
88 | .min_coredump = ELF_EXEC_PAGESIZE, |
89 | }; | |
90 | ||
8a2ab7f5 DH |
91 | static int __init init_elf_fdpic_binfmt(void) |
92 | { | |
93 | return register_binfmt(&elf_fdpic_format); | |
94 | } | |
1da177e4 | 95 | |
8a2ab7f5 DH |
96 | static void __exit exit_elf_fdpic_binfmt(void) |
97 | { | |
98 | unregister_binfmt(&elf_fdpic_format); | |
99 | } | |
100 | ||
6d8c4e3b | 101 | core_initcall(init_elf_fdpic_binfmt); |
8a2ab7f5 | 102 | module_exit(exit_elf_fdpic_binfmt); |
1da177e4 LT |
103 | |
104 | static int is_elf_fdpic(struct elfhdr *hdr, struct file *file) | |
105 | { | |
106 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) | |
107 | return 0; | |
108 | if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) | |
109 | return 0; | |
110 | if (!elf_check_arch(hdr) || !elf_check_fdpic(hdr)) | |
111 | return 0; | |
112 | if (!file->f_op || !file->f_op->mmap) | |
113 | return 0; | |
114 | return 1; | |
115 | } | |
116 | ||
117 | /*****************************************************************************/ | |
118 | /* | |
119 | * read the program headers table into memory | |
120 | */ | |
8a2ab7f5 DH |
121 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, |
122 | struct file *file) | |
1da177e4 LT |
123 | { |
124 | struct elf32_phdr *phdr; | |
125 | unsigned long size; | |
126 | int retval, loop; | |
127 | ||
128 | if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) | |
129 | return -ENOMEM; | |
130 | if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) | |
131 | return -ENOMEM; | |
132 | ||
133 | size = params->hdr.e_phnum * sizeof(struct elf_phdr); | |
134 | params->phdrs = kmalloc(size, GFP_KERNEL); | |
135 | if (!params->phdrs) | |
136 | return -ENOMEM; | |
137 | ||
8a2ab7f5 DH |
138 | retval = kernel_read(file, params->hdr.e_phoff, |
139 | (char *) params->phdrs, size); | |
e1d2c8b6 DH |
140 | if (unlikely(retval != size)) |
141 | return retval < 0 ? retval : -ENOEXEC; | |
1da177e4 LT |
142 | |
143 | /* determine stack size for this binary */ | |
144 | phdr = params->phdrs; | |
145 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
146 | if (phdr->p_type != PT_GNU_STACK) | |
147 | continue; | |
148 | ||
149 | if (phdr->p_flags & PF_X) | |
150 | params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; | |
151 | else | |
152 | params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; | |
153 | ||
154 | params->stack_size = phdr->p_memsz; | |
155 | break; | |
156 | } | |
157 | ||
158 | return 0; | |
8a2ab7f5 | 159 | } |
1da177e4 LT |
160 | |
161 | /*****************************************************************************/ | |
162 | /* | |
163 | * load an fdpic binary into various bits of memory | |
164 | */ | |
8a2ab7f5 DH |
165 | static int load_elf_fdpic_binary(struct linux_binprm *bprm, |
166 | struct pt_regs *regs) | |
1da177e4 LT |
167 | { |
168 | struct elf_fdpic_params exec_params, interp_params; | |
169 | struct elf_phdr *phdr; | |
8a2ab7f5 | 170 | unsigned long stack_size, entryaddr; |
8a2ab7f5 DH |
171 | #ifdef ELF_FDPIC_PLAT_INIT |
172 | unsigned long dynaddr; | |
173 | #endif | |
1da177e4 LT |
174 | struct file *interpreter = NULL; /* to shut gcc up */ |
175 | char *interpreter_name = NULL; | |
176 | int executable_stack; | |
177 | int retval, i; | |
178 | ||
aa289b47 DH |
179 | kdebug("____ LOAD %d ____", current->pid); |
180 | ||
1da177e4 LT |
181 | memset(&exec_params, 0, sizeof(exec_params)); |
182 | memset(&interp_params, 0, sizeof(interp_params)); | |
183 | ||
184 | exec_params.hdr = *(struct elfhdr *) bprm->buf; | |
185 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; | |
186 | ||
187 | /* check that this is a binary we know how to deal with */ | |
188 | retval = -ENOEXEC; | |
189 | if (!is_elf_fdpic(&exec_params.hdr, bprm->file)) | |
190 | goto error; | |
191 | ||
192 | /* read the program header table */ | |
193 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); | |
194 | if (retval < 0) | |
195 | goto error; | |
196 | ||
197 | /* scan for a program header that specifies an interpreter */ | |
198 | phdr = exec_params.phdrs; | |
199 | ||
200 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { | |
201 | switch (phdr->p_type) { | |
202 | case PT_INTERP: | |
203 | retval = -ENOMEM; | |
204 | if (phdr->p_filesz > PATH_MAX) | |
205 | goto error; | |
206 | retval = -ENOENT; | |
207 | if (phdr->p_filesz < 2) | |
208 | goto error; | |
209 | ||
210 | /* read the name of the interpreter into memory */ | |
792db3af | 211 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
1da177e4 LT |
212 | if (!interpreter_name) |
213 | goto error; | |
214 | ||
215 | retval = kernel_read(bprm->file, | |
216 | phdr->p_offset, | |
217 | interpreter_name, | |
218 | phdr->p_filesz); | |
e1d2c8b6 DH |
219 | if (unlikely(retval != phdr->p_filesz)) { |
220 | if (retval >= 0) | |
221 | retval = -ENOEXEC; | |
1da177e4 | 222 | goto error; |
e1d2c8b6 | 223 | } |
1da177e4 LT |
224 | |
225 | retval = -ENOENT; | |
226 | if (interpreter_name[phdr->p_filesz - 1] != '\0') | |
227 | goto error; | |
228 | ||
229 | kdebug("Using ELF interpreter %s", interpreter_name); | |
230 | ||
231 | /* replace the program with the interpreter */ | |
232 | interpreter = open_exec(interpreter_name); | |
233 | retval = PTR_ERR(interpreter); | |
234 | if (IS_ERR(interpreter)) { | |
235 | interpreter = NULL; | |
236 | goto error; | |
237 | } | |
238 | ||
1fb84496 AD |
239 | /* |
240 | * If the binary is not readable then enforce | |
241 | * mm->dumpable = 0 regardless of the interpreter's | |
242 | * permissions. | |
243 | */ | |
244 | if (file_permission(interpreter, MAY_READ) < 0) | |
245 | bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; | |
246 | ||
8a2ab7f5 DH |
247 | retval = kernel_read(interpreter, 0, bprm->buf, |
248 | BINPRM_BUF_SIZE); | |
e1d2c8b6 DH |
249 | if (unlikely(retval != BINPRM_BUF_SIZE)) { |
250 | if (retval >= 0) | |
251 | retval = -ENOEXEC; | |
1da177e4 | 252 | goto error; |
e1d2c8b6 | 253 | } |
1da177e4 LT |
254 | |
255 | interp_params.hdr = *((struct elfhdr *) bprm->buf); | |
256 | break; | |
257 | ||
258 | case PT_LOAD: | |
259 | #ifdef CONFIG_MMU | |
260 | if (exec_params.load_addr == 0) | |
261 | exec_params.load_addr = phdr->p_vaddr; | |
262 | #endif | |
263 | break; | |
264 | } | |
265 | ||
266 | } | |
267 | ||
268 | if (elf_check_const_displacement(&exec_params.hdr)) | |
269 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; | |
270 | ||
271 | /* perform insanity checks on the interpreter */ | |
272 | if (interpreter_name) { | |
273 | retval = -ELIBBAD; | |
274 | if (!is_elf_fdpic(&interp_params.hdr, interpreter)) | |
275 | goto error; | |
276 | ||
277 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT; | |
278 | ||
279 | /* read the interpreter's program header table */ | |
280 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); | |
281 | if (retval < 0) | |
282 | goto error; | |
283 | } | |
284 | ||
285 | stack_size = exec_params.stack_size; | |
1da177e4 LT |
286 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
287 | executable_stack = EXSTACK_ENABLE_X; | |
288 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) | |
289 | executable_stack = EXSTACK_DISABLE_X; | |
1da177e4 LT |
290 | else |
291 | executable_stack = EXSTACK_DEFAULT; | |
292 | ||
8e8b63a6 DH |
293 | if (stack_size == 0) { |
294 | stack_size = interp_params.stack_size; | |
295 | if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) | |
296 | executable_stack = EXSTACK_ENABLE_X; | |
297 | else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) | |
298 | executable_stack = EXSTACK_DISABLE_X; | |
299 | else | |
300 | executable_stack = EXSTACK_DEFAULT; | |
301 | } | |
302 | ||
1da177e4 LT |
303 | retval = -ENOEXEC; |
304 | if (stack_size == 0) | |
305 | goto error; | |
306 | ||
307 | if (elf_check_const_displacement(&interp_params.hdr)) | |
308 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; | |
309 | ||
310 | /* flush all traces of the currently running executable */ | |
311 | retval = flush_old_exec(bprm); | |
312 | if (retval) | |
313 | goto error; | |
314 | ||
315 | /* there's now no turning back... the old userspace image is dead, | |
316 | * defunct, deceased, etc. after this point we have to exit via | |
317 | * error_kill */ | |
318 | set_personality(PER_LINUX_FDPIC); | |
319 | set_binfmt(&elf_fdpic_format); | |
320 | ||
321 | current->mm->start_code = 0; | |
322 | current->mm->end_code = 0; | |
323 | current->mm->start_stack = 0; | |
324 | current->mm->start_data = 0; | |
325 | current->mm->end_data = 0; | |
326 | current->mm->context.exec_fdpic_loadmap = 0; | |
327 | current->mm->context.interp_fdpic_loadmap = 0; | |
328 | ||
329 | current->flags &= ~PF_FORKNOEXEC; | |
330 | ||
331 | #ifdef CONFIG_MMU | |
332 | elf_fdpic_arch_lay_out_mm(&exec_params, | |
333 | &interp_params, | |
334 | ¤t->mm->start_stack, | |
335 | ¤t->mm->start_brk); | |
1da177e4 | 336 | |
8a2ab7f5 DH |
337 | retval = setup_arg_pages(bprm, current->mm->start_stack, |
338 | executable_stack); | |
1da177e4 LT |
339 | if (retval < 0) { |
340 | send_sig(SIGKILL, current, 0); | |
341 | goto error_kill; | |
342 | } | |
343 | #endif | |
344 | ||
345 | /* load the executable and interpreter into memory */ | |
8a2ab7f5 DH |
346 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
347 | "executable"); | |
1da177e4 LT |
348 | if (retval < 0) |
349 | goto error_kill; | |
350 | ||
351 | if (interpreter_name) { | |
352 | retval = elf_fdpic_map_file(&interp_params, interpreter, | |
353 | current->mm, "interpreter"); | |
354 | if (retval < 0) { | |
355 | printk(KERN_ERR "Unable to load interpreter\n"); | |
356 | goto error_kill; | |
357 | } | |
358 | ||
359 | allow_write_access(interpreter); | |
360 | fput(interpreter); | |
361 | interpreter = NULL; | |
362 | } | |
363 | ||
364 | #ifdef CONFIG_MMU | |
365 | if (!current->mm->start_brk) | |
366 | current->mm->start_brk = current->mm->end_data; | |
367 | ||
8a2ab7f5 DH |
368 | current->mm->brk = current->mm->start_brk = |
369 | PAGE_ALIGN(current->mm->start_brk); | |
1da177e4 LT |
370 | |
371 | #else | |
372 | /* create a stack and brk area big enough for everyone | |
373 | * - the brk heap starts at the bottom and works up | |
374 | * - the stack starts at the top and works down | |
375 | */ | |
376 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; | |
377 | if (stack_size < PAGE_SIZE * 2) | |
378 | stack_size = PAGE_SIZE * 2; | |
379 | ||
380 | down_write(¤t->mm->mmap_sem); | |
8a2ab7f5 | 381 | current->mm->start_brk = do_mmap(NULL, 0, stack_size, |
1da177e4 | 382 | PROT_READ | PROT_WRITE | PROT_EXEC, |
e10a4437 | 383 | MAP_PRIVATE | MAP_ANONYMOUS | MAP_GROWSDOWN, |
1da177e4 LT |
384 | 0); |
385 | ||
8a2ab7f5 | 386 | if (IS_ERR_VALUE(current->mm->start_brk)) { |
1da177e4 LT |
387 | up_write(¤t->mm->mmap_sem); |
388 | retval = current->mm->start_brk; | |
389 | current->mm->start_brk = 0; | |
390 | goto error_kill; | |
391 | } | |
392 | ||
1da177e4 LT |
393 | up_write(¤t->mm->mmap_sem); |
394 | ||
395 | current->mm->brk = current->mm->start_brk; | |
396 | current->mm->context.end_brk = current->mm->start_brk; | |
8a2ab7f5 DH |
397 | current->mm->context.end_brk += |
398 | (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0; | |
1da177e4 LT |
399 | current->mm->start_stack = current->mm->start_brk + stack_size; |
400 | #endif | |
401 | ||
a6f76f23 | 402 | install_exec_creds(bprm); |
1da177e4 | 403 | current->flags &= ~PF_FORKNOEXEC; |
8a2ab7f5 DH |
404 | if (create_elf_fdpic_tables(bprm, current->mm, |
405 | &exec_params, &interp_params) < 0) | |
1da177e4 LT |
406 | goto error_kill; |
407 | ||
8a2ab7f5 DH |
408 | kdebug("- start_code %lx", current->mm->start_code); |
409 | kdebug("- end_code %lx", current->mm->end_code); | |
410 | kdebug("- start_data %lx", current->mm->start_data); | |
411 | kdebug("- end_data %lx", current->mm->end_data); | |
412 | kdebug("- start_brk %lx", current->mm->start_brk); | |
413 | kdebug("- brk %lx", current->mm->brk); | |
414 | kdebug("- start_stack %lx", current->mm->start_stack); | |
1da177e4 LT |
415 | |
416 | #ifdef ELF_FDPIC_PLAT_INIT | |
417 | /* | |
418 | * The ABI may specify that certain registers be set up in special | |
419 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
420 | * example. This macro performs whatever initialization to | |
421 | * the regs structure is required. | |
422 | */ | |
8a2ab7f5 DH |
423 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; |
424 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, | |
425 | dynaddr); | |
1da177e4 LT |
426 | #endif |
427 | ||
428 | /* everything is now ready... get the userspace context ready to roll */ | |
8a2ab7f5 DH |
429 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
430 | start_thread(regs, entryaddr, current->mm->start_stack); | |
1da177e4 | 431 | |
1da177e4 LT |
432 | retval = 0; |
433 | ||
434 | error: | |
435 | if (interpreter) { | |
436 | allow_write_access(interpreter); | |
437 | fput(interpreter); | |
438 | } | |
f99d49ad JJ |
439 | kfree(interpreter_name); |
440 | kfree(exec_params.phdrs); | |
441 | kfree(exec_params.loadmap); | |
442 | kfree(interp_params.phdrs); | |
443 | kfree(interp_params.loadmap); | |
1da177e4 LT |
444 | return retval; |
445 | ||
446 | /* unrecoverable error - kill the process */ | |
8a2ab7f5 | 447 | error_kill: |
1da177e4 LT |
448 | send_sig(SIGSEGV, current, 0); |
449 | goto error; | |
450 | ||
8a2ab7f5 | 451 | } |
1da177e4 LT |
452 | |
453 | /*****************************************************************************/ | |
ec23847d PM |
454 | |
455 | #ifndef ELF_BASE_PLATFORM | |
456 | /* | |
457 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. | |
458 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value | |
459 | * will be copied to the user stack in the same manner as AT_PLATFORM. | |
460 | */ | |
461 | #define ELF_BASE_PLATFORM NULL | |
462 | #endif | |
463 | ||
1da177e4 | 464 | /* |
c7637941 PM |
465 | * present useful information to the program by shovelling it onto the new |
466 | * process's stack | |
1da177e4 LT |
467 | */ |
468 | static int create_elf_fdpic_tables(struct linux_binprm *bprm, | |
469 | struct mm_struct *mm, | |
470 | struct elf_fdpic_params *exec_params, | |
471 | struct elf_fdpic_params *interp_params) | |
472 | { | |
86a264ab | 473 | const struct cred *cred = current_cred(); |
1da177e4 | 474 | unsigned long sp, csp, nitems; |
530018bf | 475 | elf_caddr_t __user *argv, *envp; |
1da177e4 | 476 | size_t platform_len = 0, len; |
ec23847d PM |
477 | char *k_platform, *k_base_platform; |
478 | char __user *u_platform, *u_base_platform, *p; | |
1da177e4 LT |
479 | long hwcap; |
480 | int loop; | |
9b14ec35 | 481 | int nr; /* reset for each csp adjustment */ |
1da177e4 | 482 | |
1da177e4 | 483 | #ifdef CONFIG_MMU |
c7637941 PM |
484 | /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions |
485 | * by the processes running on the same package. One thing we can do is | |
486 | * to shuffle the initial stack for them, so we give the architecture | |
487 | * an opportunity to do so here. | |
488 | */ | |
489 | sp = arch_align_stack(bprm->p); | |
1da177e4 LT |
490 | #else |
491 | sp = mm->start_stack; | |
492 | ||
493 | /* stack the program arguments and environment */ | |
494 | if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0) | |
495 | return -EFAULT; | |
496 | #endif | |
497 | ||
1da177e4 | 498 | hwcap = ELF_HWCAP; |
ec23847d PM |
499 | |
500 | /* | |
501 | * If this architecture has a platform capability string, copy it | |
502 | * to userspace. In some cases (Sparc), this info is impossible | |
503 | * for userspace to get any other way, in others (i386) it is | |
504 | * merely difficult. | |
505 | */ | |
1da177e4 | 506 | k_platform = ELF_PLATFORM; |
1aeb21d6 | 507 | u_platform = NULL; |
1da177e4 LT |
508 | |
509 | if (k_platform) { | |
510 | platform_len = strlen(k_platform) + 1; | |
511 | sp -= platform_len; | |
530018bf | 512 | u_platform = (char __user *) sp; |
1da177e4 LT |
513 | if (__copy_to_user(u_platform, k_platform, platform_len) != 0) |
514 | return -EFAULT; | |
515 | } | |
516 | ||
ec23847d PM |
517 | /* |
518 | * If this architecture has a "base" platform capability | |
519 | * string, copy it to userspace. | |
520 | */ | |
521 | k_base_platform = ELF_BASE_PLATFORM; | |
522 | u_base_platform = NULL; | |
523 | ||
524 | if (k_base_platform) { | |
525 | platform_len = strlen(k_base_platform) + 1; | |
526 | sp -= platform_len; | |
527 | u_base_platform = (char __user *) sp; | |
528 | if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0) | |
529 | return -EFAULT; | |
530 | } | |
531 | ||
1da177e4 LT |
532 | sp &= ~7UL; |
533 | ||
534 | /* stack the load map(s) */ | |
535 | len = sizeof(struct elf32_fdpic_loadmap); | |
536 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; | |
537 | sp = (sp - len) & ~7UL; | |
538 | exec_params->map_addr = sp; | |
539 | ||
530018bf | 540 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
1da177e4 LT |
541 | return -EFAULT; |
542 | ||
543 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; | |
544 | ||
545 | if (interp_params->loadmap) { | |
546 | len = sizeof(struct elf32_fdpic_loadmap); | |
8a2ab7f5 DH |
547 | len += sizeof(struct elf32_fdpic_loadseg) * |
548 | interp_params->loadmap->nsegs; | |
1da177e4 LT |
549 | sp = (sp - len) & ~7UL; |
550 | interp_params->map_addr = sp; | |
551 | ||
8a2ab7f5 DH |
552 | if (copy_to_user((void __user *) sp, interp_params->loadmap, |
553 | len) != 0) | |
1da177e4 LT |
554 | return -EFAULT; |
555 | ||
556 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; | |
557 | } | |
558 | ||
559 | /* force 16 byte _final_ alignment here for generality */ | |
5edc2a51 | 560 | #define DLINFO_ITEMS 15 |
1da177e4 | 561 | |
ec23847d PM |
562 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + |
563 | (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH; | |
1da177e4 | 564 | |
5edc2a51 PM |
565 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) |
566 | nitems++; | |
567 | ||
1da177e4 LT |
568 | csp = sp; |
569 | sp -= nitems * 2 * sizeof(unsigned long); | |
570 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ | |
571 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ | |
572 | sp -= 1 * sizeof(unsigned long); /* argc */ | |
573 | ||
574 | csp -= sp & 15UL; | |
575 | sp -= sp & 15UL; | |
576 | ||
577 | /* put the ELF interpreter info on the stack */ | |
9b14ec35 | 578 | #define NEW_AUX_ENT(id, val) \ |
8a2ab7f5 DH |
579 | do { \ |
580 | struct { unsigned long _id, _val; } __user *ent; \ | |
581 | \ | |
582 | ent = (void __user *) csp; \ | |
583 | __put_user((id), &ent[nr]._id); \ | |
584 | __put_user((val), &ent[nr]._val); \ | |
9b14ec35 | 585 | nr++; \ |
1da177e4 LT |
586 | } while (0) |
587 | ||
9b14ec35 | 588 | nr = 0; |
1da177e4 | 589 | csp -= 2 * sizeof(unsigned long); |
9b14ec35 | 590 | NEW_AUX_ENT(AT_NULL, 0); |
1da177e4 | 591 | if (k_platform) { |
9b14ec35 | 592 | nr = 0; |
1da177e4 | 593 | csp -= 2 * sizeof(unsigned long); |
9b14ec35 | 594 | NEW_AUX_ENT(AT_PLATFORM, |
8a2ab7f5 | 595 | (elf_addr_t) (unsigned long) u_platform); |
1da177e4 LT |
596 | } |
597 | ||
ec23847d PM |
598 | if (k_base_platform) { |
599 | nr = 0; | |
600 | csp -= 2 * sizeof(unsigned long); | |
601 | NEW_AUX_ENT(AT_BASE_PLATFORM, | |
602 | (elf_addr_t) (unsigned long) u_base_platform); | |
603 | } | |
604 | ||
5edc2a51 PM |
605 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
606 | nr = 0; | |
607 | csp -= 2 * sizeof(unsigned long); | |
608 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); | |
609 | } | |
610 | ||
9b14ec35 | 611 | nr = 0; |
1da177e4 | 612 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); |
9b14ec35 PM |
613 | NEW_AUX_ENT(AT_HWCAP, hwcap); |
614 | NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE); | |
615 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
616 | NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr); | |
617 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); | |
618 | NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum); | |
619 | NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr); | |
620 | NEW_AUX_ENT(AT_FLAGS, 0); | |
621 | NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr); | |
86a264ab DH |
622 | NEW_AUX_ENT(AT_UID, (elf_addr_t) cred->uid); |
623 | NEW_AUX_ENT(AT_EUID, (elf_addr_t) cred->euid); | |
624 | NEW_AUX_ENT(AT_GID, (elf_addr_t) cred->gid); | |
625 | NEW_AUX_ENT(AT_EGID, (elf_addr_t) cred->egid); | |
5edc2a51 PM |
626 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
627 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); | |
1da177e4 LT |
628 | |
629 | #ifdef ARCH_DLINFO | |
9b14ec35 PM |
630 | nr = 0; |
631 | csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long); | |
632 | ||
1da177e4 LT |
633 | /* ARCH_DLINFO must come last so platform specific code can enforce |
634 | * special alignment requirements on the AUXV if necessary (eg. PPC). | |
635 | */ | |
636 | ARCH_DLINFO; | |
637 | #endif | |
638 | #undef NEW_AUX_ENT | |
639 | ||
640 | /* allocate room for argv[] and envv[] */ | |
641 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); | |
530018bf | 642 | envp = (elf_caddr_t __user *) csp; |
1da177e4 | 643 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
530018bf | 644 | argv = (elf_caddr_t __user *) csp; |
1da177e4 LT |
645 | |
646 | /* stack argc */ | |
647 | csp -= sizeof(unsigned long); | |
530018bf | 648 | __put_user(bprm->argc, (unsigned long __user *) csp); |
1da177e4 | 649 | |
88bcd512 | 650 | BUG_ON(csp != sp); |
1da177e4 LT |
651 | |
652 | /* fill in the argv[] array */ | |
653 | #ifdef CONFIG_MMU | |
654 | current->mm->arg_start = bprm->p; | |
655 | #else | |
8a2ab7f5 DH |
656 | current->mm->arg_start = current->mm->start_stack - |
657 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); | |
1da177e4 LT |
658 | #endif |
659 | ||
530018bf | 660 | p = (char __user *) current->mm->arg_start; |
1da177e4 LT |
661 | for (loop = bprm->argc; loop > 0; loop--) { |
662 | __put_user((elf_caddr_t) p, argv++); | |
b6a2fea3 OW |
663 | len = strnlen_user(p, MAX_ARG_STRLEN); |
664 | if (!len || len > MAX_ARG_STRLEN) | |
1da177e4 LT |
665 | return -EINVAL; |
666 | p += len; | |
667 | } | |
668 | __put_user(NULL, argv); | |
669 | current->mm->arg_end = (unsigned long) p; | |
670 | ||
671 | /* fill in the envv[] array */ | |
672 | current->mm->env_start = (unsigned long) p; | |
673 | for (loop = bprm->envc; loop > 0; loop--) { | |
674 | __put_user((elf_caddr_t)(unsigned long) p, envp++); | |
b6a2fea3 OW |
675 | len = strnlen_user(p, MAX_ARG_STRLEN); |
676 | if (!len || len > MAX_ARG_STRLEN) | |
1da177e4 LT |
677 | return -EINVAL; |
678 | p += len; | |
679 | } | |
680 | __put_user(NULL, envp); | |
681 | current->mm->env_end = (unsigned long) p; | |
682 | ||
683 | mm->start_stack = (unsigned long) sp; | |
684 | return 0; | |
8a2ab7f5 | 685 | } |
1da177e4 LT |
686 | |
687 | /*****************************************************************************/ | |
688 | /* | |
689 | * transfer the program arguments and environment from the holding pages onto | |
690 | * the stack | |
691 | */ | |
692 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
693 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm, |
694 | unsigned long *_sp) | |
1da177e4 LT |
695 | { |
696 | unsigned long index, stop, sp; | |
697 | char *src; | |
698 | int ret = 0; | |
699 | ||
700 | stop = bprm->p >> PAGE_SHIFT; | |
701 | sp = *_sp; | |
702 | ||
703 | for (index = MAX_ARG_PAGES - 1; index >= stop; index--) { | |
704 | src = kmap(bprm->page[index]); | |
705 | sp -= PAGE_SIZE; | |
706 | if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0) | |
707 | ret = -EFAULT; | |
708 | kunmap(bprm->page[index]); | |
709 | if (ret < 0) | |
710 | goto out; | |
711 | } | |
712 | ||
713 | *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15; | |
714 | ||
8a2ab7f5 | 715 | out: |
1da177e4 | 716 | return ret; |
8a2ab7f5 | 717 | } |
1da177e4 LT |
718 | #endif |
719 | ||
720 | /*****************************************************************************/ | |
721 | /* | |
722 | * load the appropriate binary image (executable or interpreter) into memory | |
723 | * - we assume no MMU is available | |
724 | * - if no other PIC bits are set in params->hdr->e_flags | |
725 | * - we assume that the LOADable segments in the binary are independently relocatable | |
726 | * - we assume R/O executable segments are shareable | |
727 | * - else | |
728 | * - we assume the loadable parts of the image to require fixed displacement | |
729 | * - the image is not shareable | |
730 | */ | |
731 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, | |
732 | struct file *file, | |
733 | struct mm_struct *mm, | |
734 | const char *what) | |
735 | { | |
736 | struct elf32_fdpic_loadmap *loadmap; | |
737 | #ifdef CONFIG_MMU | |
738 | struct elf32_fdpic_loadseg *mseg; | |
739 | #endif | |
740 | struct elf32_fdpic_loadseg *seg; | |
741 | struct elf32_phdr *phdr; | |
742 | unsigned long load_addr, stop; | |
743 | unsigned nloads, tmp; | |
744 | size_t size; | |
745 | int loop, ret; | |
746 | ||
747 | /* allocate a load map table */ | |
748 | nloads = 0; | |
749 | for (loop = 0; loop < params->hdr.e_phnum; loop++) | |
750 | if (params->phdrs[loop].p_type == PT_LOAD) | |
751 | nloads++; | |
752 | ||
753 | if (nloads == 0) | |
754 | return -ELIBBAD; | |
755 | ||
756 | size = sizeof(*loadmap) + nloads * sizeof(*seg); | |
b87576d5 | 757 | loadmap = kzalloc(size, GFP_KERNEL); |
1da177e4 LT |
758 | if (!loadmap) |
759 | return -ENOMEM; | |
760 | ||
761 | params->loadmap = loadmap; | |
1da177e4 LT |
762 | |
763 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; | |
764 | loadmap->nsegs = nloads; | |
765 | ||
766 | load_addr = params->load_addr; | |
767 | seg = loadmap->segs; | |
768 | ||
769 | /* map the requested LOADs into the memory space */ | |
770 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
771 | case ELF_FDPIC_FLAG_CONSTDISP: | |
772 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
773 | #ifndef CONFIG_MMU | |
774 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); | |
775 | if (ret < 0) | |
776 | return ret; | |
777 | break; | |
778 | #endif | |
779 | default: | |
780 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); | |
781 | if (ret < 0) | |
782 | return ret; | |
783 | break; | |
784 | } | |
785 | ||
786 | /* map the entry point */ | |
787 | if (params->hdr.e_entry) { | |
788 | seg = loadmap->segs; | |
789 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
790 | if (params->hdr.e_entry >= seg->p_vaddr && | |
8a2ab7f5 | 791 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
1da177e4 | 792 | params->entry_addr = |
8a2ab7f5 DH |
793 | (params->hdr.e_entry - seg->p_vaddr) + |
794 | seg->addr; | |
1da177e4 LT |
795 | break; |
796 | } | |
797 | } | |
798 | } | |
799 | ||
800 | /* determine where the program header table has wound up if mapped */ | |
8a2ab7f5 DH |
801 | stop = params->hdr.e_phoff; |
802 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); | |
1da177e4 LT |
803 | phdr = params->phdrs; |
804 | ||
805 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
806 | if (phdr->p_type != PT_LOAD) | |
807 | continue; | |
808 | ||
809 | if (phdr->p_offset > params->hdr.e_phoff || | |
810 | phdr->p_offset + phdr->p_filesz < stop) | |
811 | continue; | |
812 | ||
813 | seg = loadmap->segs; | |
814 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
815 | if (phdr->p_vaddr >= seg->p_vaddr && | |
8a2ab7f5 DH |
816 | phdr->p_vaddr + phdr->p_filesz <= |
817 | seg->p_vaddr + seg->p_memsz) { | |
818 | params->ph_addr = | |
819 | (phdr->p_vaddr - seg->p_vaddr) + | |
820 | seg->addr + | |
1da177e4 LT |
821 | params->hdr.e_phoff - phdr->p_offset; |
822 | break; | |
823 | } | |
824 | } | |
825 | break; | |
826 | } | |
827 | ||
828 | /* determine where the dynamic section has wound up if there is one */ | |
829 | phdr = params->phdrs; | |
830 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
831 | if (phdr->p_type != PT_DYNAMIC) | |
832 | continue; | |
833 | ||
834 | seg = loadmap->segs; | |
835 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
836 | if (phdr->p_vaddr >= seg->p_vaddr && | |
8a2ab7f5 DH |
837 | phdr->p_vaddr + phdr->p_memsz <= |
838 | seg->p_vaddr + seg->p_memsz) { | |
839 | params->dynamic_addr = | |
840 | (phdr->p_vaddr - seg->p_vaddr) + | |
841 | seg->addr; | |
842 | ||
843 | /* check the dynamic section contains at least | |
844 | * one item, and that the last item is a NULL | |
845 | * entry */ | |
1da177e4 LT |
846 | if (phdr->p_memsz == 0 || |
847 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) | |
848 | goto dynamic_error; | |
849 | ||
850 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); | |
8a2ab7f5 DH |
851 | if (((Elf32_Dyn *) |
852 | params->dynamic_addr)[tmp - 1].d_tag != 0) | |
1da177e4 LT |
853 | goto dynamic_error; |
854 | break; | |
855 | } | |
856 | } | |
857 | break; | |
858 | } | |
859 | ||
860 | /* now elide adjacent segments in the load map on MMU linux | |
8a2ab7f5 DH |
861 | * - on uClinux the holes between may actually be filled with system |
862 | * stuff or stuff from other processes | |
1da177e4 LT |
863 | */ |
864 | #ifdef CONFIG_MMU | |
865 | nloads = loadmap->nsegs; | |
866 | mseg = loadmap->segs; | |
867 | seg = mseg + 1; | |
868 | for (loop = 1; loop < nloads; loop++) { | |
869 | /* see if we have a candidate for merging */ | |
870 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { | |
871 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); | |
872 | if (load_addr == (seg->addr & PAGE_MASK)) { | |
8a2ab7f5 DH |
873 | mseg->p_memsz += |
874 | load_addr - | |
875 | (mseg->addr + mseg->p_memsz); | |
1da177e4 LT |
876 | mseg->p_memsz += seg->addr & ~PAGE_MASK; |
877 | mseg->p_memsz += seg->p_memsz; | |
878 | loadmap->nsegs--; | |
879 | continue; | |
880 | } | |
881 | } | |
882 | ||
883 | mseg++; | |
884 | if (mseg != seg) | |
885 | *mseg = *seg; | |
886 | } | |
887 | #endif | |
888 | ||
889 | kdebug("Mapped Object [%s]:", what); | |
890 | kdebug("- elfhdr : %lx", params->elfhdr_addr); | |
891 | kdebug("- entry : %lx", params->entry_addr); | |
892 | kdebug("- PHDR[] : %lx", params->ph_addr); | |
893 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); | |
894 | seg = loadmap->segs; | |
895 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) | |
896 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", | |
897 | loop, | |
898 | seg->addr, seg->addr + seg->p_memsz - 1, | |
899 | seg->p_vaddr, seg->p_memsz); | |
900 | ||
901 | return 0; | |
902 | ||
8a2ab7f5 | 903 | dynamic_error: |
1da177e4 | 904 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
0f7fc9e4 | 905 | what, file->f_path.dentry->d_inode->i_ino); |
1da177e4 | 906 | return -ELIBBAD; |
8a2ab7f5 | 907 | } |
1da177e4 LT |
908 | |
909 | /*****************************************************************************/ | |
910 | /* | |
911 | * map a file with constant displacement under uClinux | |
912 | */ | |
913 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
914 | static int elf_fdpic_map_file_constdisp_on_uclinux( |
915 | struct elf_fdpic_params *params, | |
916 | struct file *file, | |
917 | struct mm_struct *mm) | |
1da177e4 LT |
918 | { |
919 | struct elf32_fdpic_loadseg *seg; | |
920 | struct elf32_phdr *phdr; | |
921 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags; | |
922 | loff_t fpos; | |
923 | int loop, ret; | |
924 | ||
925 | load_addr = params->load_addr; | |
926 | seg = params->loadmap->segs; | |
927 | ||
8a2ab7f5 DH |
928 | /* determine the bounds of the contiguous overall allocation we must |
929 | * make */ | |
1da177e4 LT |
930 | phdr = params->phdrs; |
931 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
932 | if (params->phdrs[loop].p_type != PT_LOAD) | |
933 | continue; | |
934 | ||
935 | if (base > phdr->p_vaddr) | |
936 | base = phdr->p_vaddr; | |
937 | if (top < phdr->p_vaddr + phdr->p_memsz) | |
938 | top = phdr->p_vaddr + phdr->p_memsz; | |
939 | } | |
940 | ||
941 | /* allocate one big anon block for everything */ | |
942 | mflags = MAP_PRIVATE; | |
943 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
944 | mflags |= MAP_EXECUTABLE; | |
945 | ||
946 | down_write(&mm->mmap_sem); | |
947 | maddr = do_mmap(NULL, load_addr, top - base, | |
948 | PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); | |
949 | up_write(&mm->mmap_sem); | |
8a2ab7f5 | 950 | if (IS_ERR_VALUE(maddr)) |
1da177e4 LT |
951 | return (int) maddr; |
952 | ||
953 | if (load_addr != 0) | |
954 | load_addr += PAGE_ALIGN(top - base); | |
955 | ||
956 | /* and then load the file segments into it */ | |
957 | phdr = params->phdrs; | |
958 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
959 | if (params->phdrs[loop].p_type != PT_LOAD) | |
960 | continue; | |
961 | ||
962 | fpos = phdr->p_offset; | |
963 | ||
964 | seg->addr = maddr + (phdr->p_vaddr - base); | |
965 | seg->p_vaddr = phdr->p_vaddr; | |
966 | seg->p_memsz = phdr->p_memsz; | |
967 | ||
8a2ab7f5 DH |
968 | ret = file->f_op->read(file, (void *) seg->addr, |
969 | phdr->p_filesz, &fpos); | |
1da177e4 LT |
970 | if (ret < 0) |
971 | return ret; | |
972 | ||
973 | /* map the ELF header address if in this segment */ | |
974 | if (phdr->p_offset == 0) | |
975 | params->elfhdr_addr = seg->addr; | |
976 | ||
977 | /* clear any space allocated but not loaded */ | |
ab4ad555 MF |
978 | if (phdr->p_filesz < phdr->p_memsz) { |
979 | ret = clear_user((void *) (seg->addr + phdr->p_filesz), | |
980 | phdr->p_memsz - phdr->p_filesz); | |
981 | if (ret) | |
982 | return ret; | |
983 | } | |
1da177e4 LT |
984 | |
985 | if (mm) { | |
986 | if (phdr->p_flags & PF_X) { | |
aa289b47 DH |
987 | if (!mm->start_code) { |
988 | mm->start_code = seg->addr; | |
989 | mm->end_code = seg->addr + | |
990 | phdr->p_memsz; | |
991 | } | |
8a2ab7f5 | 992 | } else if (!mm->start_data) { |
1da177e4 LT |
993 | mm->start_data = seg->addr; |
994 | #ifndef CONFIG_MMU | |
995 | mm->end_data = seg->addr + phdr->p_memsz; | |
996 | #endif | |
997 | } | |
998 | ||
999 | #ifdef CONFIG_MMU | |
1000 | if (seg->addr + phdr->p_memsz > mm->end_data) | |
1001 | mm->end_data = seg->addr + phdr->p_memsz; | |
1002 | #endif | |
1003 | } | |
1004 | ||
1005 | seg++; | |
1006 | } | |
1007 | ||
1008 | return 0; | |
8a2ab7f5 | 1009 | } |
1da177e4 LT |
1010 | #endif |
1011 | ||
1012 | /*****************************************************************************/ | |
1013 | /* | |
1014 | * map a binary by direct mmap() of the individual PT_LOAD segments | |
1015 | */ | |
1016 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, | |
1017 | struct file *file, | |
1018 | struct mm_struct *mm) | |
1019 | { | |
1020 | struct elf32_fdpic_loadseg *seg; | |
1021 | struct elf32_phdr *phdr; | |
1022 | unsigned long load_addr, delta_vaddr; | |
ab4ad555 | 1023 | int loop, dvset, ret; |
1da177e4 LT |
1024 | |
1025 | load_addr = params->load_addr; | |
1026 | delta_vaddr = 0; | |
1027 | dvset = 0; | |
1028 | ||
1029 | seg = params->loadmap->segs; | |
1030 | ||
1031 | /* deal with each load segment separately */ | |
1032 | phdr = params->phdrs; | |
1033 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
1034 | unsigned long maddr, disp, excess, excess1; | |
1035 | int prot = 0, flags; | |
1036 | ||
1037 | if (phdr->p_type != PT_LOAD) | |
1038 | continue; | |
1039 | ||
1040 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", | |
1041 | (unsigned long) phdr->p_vaddr, | |
1042 | (unsigned long) phdr->p_offset, | |
1043 | (unsigned long) phdr->p_filesz, | |
1044 | (unsigned long) phdr->p_memsz); | |
1045 | ||
1046 | /* determine the mapping parameters */ | |
1047 | if (phdr->p_flags & PF_R) prot |= PROT_READ; | |
1048 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; | |
1049 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; | |
1050 | ||
1051 | flags = MAP_PRIVATE | MAP_DENYWRITE; | |
1052 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
1053 | flags |= MAP_EXECUTABLE; | |
1054 | ||
1055 | maddr = 0; | |
1056 | ||
1057 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
1058 | case ELF_FDPIC_FLAG_INDEPENDENT: | |
1059 | /* PT_LOADs are independently locatable */ | |
1060 | break; | |
1061 | ||
1062 | case ELF_FDPIC_FLAG_HONOURVADDR: | |
1063 | /* the specified virtual address must be honoured */ | |
1064 | maddr = phdr->p_vaddr; | |
1065 | flags |= MAP_FIXED; | |
1066 | break; | |
1067 | ||
1068 | case ELF_FDPIC_FLAG_CONSTDISP: | |
1069 | /* constant displacement | |
8a2ab7f5 DH |
1070 | * - can be mapped anywhere, but must be mapped as a |
1071 | * unit | |
1da177e4 LT |
1072 | */ |
1073 | if (!dvset) { | |
1074 | maddr = load_addr; | |
1075 | delta_vaddr = phdr->p_vaddr; | |
1076 | dvset = 1; | |
8a2ab7f5 | 1077 | } else { |
1da177e4 LT |
1078 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
1079 | flags |= MAP_FIXED; | |
1080 | } | |
1081 | break; | |
1082 | ||
1083 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
1084 | /* contiguity handled later */ | |
1085 | break; | |
1086 | ||
1087 | default: | |
1088 | BUG(); | |
1089 | } | |
1090 | ||
1091 | maddr &= PAGE_MASK; | |
1092 | ||
1093 | /* create the mapping */ | |
1094 | disp = phdr->p_vaddr & ~PAGE_MASK; | |
1095 | down_write(&mm->mmap_sem); | |
1096 | maddr = do_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, | |
1097 | phdr->p_offset - disp); | |
1098 | up_write(&mm->mmap_sem); | |
1099 | ||
1100 | kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", | |
8a2ab7f5 DH |
1101 | loop, phdr->p_memsz + disp, prot, flags, |
1102 | phdr->p_offset - disp, maddr); | |
1da177e4 | 1103 | |
8a2ab7f5 | 1104 | if (IS_ERR_VALUE(maddr)) |
1da177e4 LT |
1105 | return (int) maddr; |
1106 | ||
8a2ab7f5 DH |
1107 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
1108 | ELF_FDPIC_FLAG_CONTIGUOUS) | |
1da177e4 LT |
1109 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
1110 | ||
1111 | seg->addr = maddr + disp; | |
1112 | seg->p_vaddr = phdr->p_vaddr; | |
1113 | seg->p_memsz = phdr->p_memsz; | |
1114 | ||
1115 | /* map the ELF header address if in this segment */ | |
1116 | if (phdr->p_offset == 0) | |
1117 | params->elfhdr_addr = seg->addr; | |
1118 | ||
8a2ab7f5 DH |
1119 | /* clear the bit between beginning of mapping and beginning of |
1120 | * PT_LOAD */ | |
1da177e4 LT |
1121 | if (prot & PROT_WRITE && disp > 0) { |
1122 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); | |
ab4ad555 MF |
1123 | ret = clear_user((void __user *) maddr, disp); |
1124 | if (ret) | |
1125 | return ret; | |
1da177e4 LT |
1126 | maddr += disp; |
1127 | } | |
1128 | ||
1129 | /* clear any space allocated but not loaded | |
1130 | * - on uClinux we can just clear the lot | |
1131 | * - on MMU linux we'll get a SIGBUS beyond the last page | |
1132 | * extant in the file | |
1133 | */ | |
1134 | excess = phdr->p_memsz - phdr->p_filesz; | |
1135 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); | |
1136 | ||
1137 | #ifdef CONFIG_MMU | |
1da177e4 LT |
1138 | if (excess > excess1) { |
1139 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; | |
1140 | unsigned long xmaddr; | |
1141 | ||
1142 | flags |= MAP_FIXED | MAP_ANONYMOUS; | |
1143 | down_write(&mm->mmap_sem); | |
8a2ab7f5 DH |
1144 | xmaddr = do_mmap(NULL, xaddr, excess - excess1, |
1145 | prot, flags, 0); | |
1da177e4 LT |
1146 | up_write(&mm->mmap_sem); |
1147 | ||
1148 | kdebug("mmap[%d] <anon>" | |
1149 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", | |
8a2ab7f5 DH |
1150 | loop, xaddr, excess - excess1, prot, flags, |
1151 | xmaddr); | |
1da177e4 LT |
1152 | |
1153 | if (xmaddr != xaddr) | |
1154 | return -ENOMEM; | |
1155 | } | |
1156 | ||
1157 | if (prot & PROT_WRITE && excess1 > 0) { | |
1158 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1159 | loop, maddr + phdr->p_filesz, excess1); | |
ab4ad555 MF |
1160 | ret = clear_user((void __user *) maddr + phdr->p_filesz, |
1161 | excess1); | |
1162 | if (ret) | |
1163 | return ret; | |
1da177e4 LT |
1164 | } |
1165 | ||
1166 | #else | |
1167 | if (excess > 0) { | |
1168 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1169 | loop, maddr + phdr->p_filesz, excess); | |
ab4ad555 MF |
1170 | ret = clear_user((void *) maddr + phdr->p_filesz, excess); |
1171 | if (ret) | |
1172 | return ret; | |
1da177e4 LT |
1173 | } |
1174 | #endif | |
1175 | ||
1176 | if (mm) { | |
1177 | if (phdr->p_flags & PF_X) { | |
aa289b47 DH |
1178 | if (!mm->start_code) { |
1179 | mm->start_code = maddr; | |
1180 | mm->end_code = maddr + phdr->p_memsz; | |
1181 | } | |
8a2ab7f5 | 1182 | } else if (!mm->start_data) { |
1da177e4 LT |
1183 | mm->start_data = maddr; |
1184 | mm->end_data = maddr + phdr->p_memsz; | |
1185 | } | |
1186 | } | |
1187 | ||
1188 | seg++; | |
1189 | } | |
1190 | ||
1191 | return 0; | |
8a2ab7f5 | 1192 | } |
6d8c4e3b DH |
1193 | |
1194 | /*****************************************************************************/ | |
1195 | /* | |
1196 | * ELF-FDPIC core dumper | |
1197 | * | |
1198 | * Modelled on fs/exec.c:aout_core_dump() | |
1199 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1200 | * | |
1201 | * Modelled on fs/binfmt_elf.c core dumper | |
1202 | */ | |
1203 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) | |
1204 | ||
1205 | /* | |
1206 | * These are the only things you should do on a core-file: use only these | |
1207 | * functions to write out all the necessary info. | |
1208 | */ | |
1209 | static int dump_write(struct file *file, const void *addr, int nr) | |
1210 | { | |
1211 | return file->f_op->write(file, addr, nr, &file->f_pos) == nr; | |
1212 | } | |
1213 | ||
1214 | static int dump_seek(struct file *file, loff_t off) | |
1215 | { | |
1216 | if (file->f_op->llseek) { | |
1217 | if (file->f_op->llseek(file, off, SEEK_SET) != off) | |
1218 | return 0; | |
1219 | } else { | |
1220 | file->f_pos = off; | |
1221 | } | |
1222 | return 1; | |
1223 | } | |
1224 | ||
1225 | /* | |
1226 | * Decide whether a segment is worth dumping; default is yes to be | |
1227 | * sure (missing info is worse than too much; etc). | |
1228 | * Personally I'd include everything, and use the coredump limit... | |
1229 | * | |
1230 | * I think we should skip something. But I am not sure how. H.J. | |
1231 | */ | |
ee78b0a6 | 1232 | static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) |
6d8c4e3b | 1233 | { |
ee78b0a6 KH |
1234 | int dump_ok; |
1235 | ||
6d8c4e3b DH |
1236 | /* Do not dump I/O mapped devices or special mappings */ |
1237 | if (vma->vm_flags & (VM_IO | VM_RESERVED)) { | |
1238 | kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags); | |
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | /* If we may not read the contents, don't allow us to dump | |
1243 | * them either. "dump_write()" can't handle it anyway. | |
1244 | */ | |
1245 | if (!(vma->vm_flags & VM_READ)) { | |
1246 | kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags); | |
1247 | return 0; | |
1248 | } | |
1249 | ||
ee78b0a6 | 1250 | /* By default, dump shared memory if mapped from an anonymous file. */ |
6d8c4e3b | 1251 | if (vma->vm_flags & VM_SHARED) { |
0f7fc9e4 | 1252 | if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0) { |
ee78b0a6 KH |
1253 | dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags); |
1254 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, | |
1255 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1256 | return dump_ok; | |
6d8c4e3b DH |
1257 | } |
1258 | ||
ee78b0a6 KH |
1259 | dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags); |
1260 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, | |
1261 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1262 | return dump_ok; | |
6d8c4e3b DH |
1263 | } |
1264 | ||
1265 | #ifdef CONFIG_MMU | |
ee78b0a6 | 1266 | /* By default, if it hasn't been written to, don't write it out */ |
6d8c4e3b | 1267 | if (!vma->anon_vma) { |
ee78b0a6 KH |
1268 | dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags); |
1269 | kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start, | |
1270 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1271 | return dump_ok; | |
6d8c4e3b DH |
1272 | } |
1273 | #endif | |
1274 | ||
ee78b0a6 KH |
1275 | dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags); |
1276 | kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags, | |
1277 | dump_ok ? "yes" : "no"); | |
1278 | return dump_ok; | |
6d8c4e3b DH |
1279 | } |
1280 | ||
1281 | /* An ELF note in memory */ | |
1282 | struct memelfnote | |
1283 | { | |
1284 | const char *name; | |
1285 | int type; | |
1286 | unsigned int datasz; | |
1287 | void *data; | |
1288 | }; | |
1289 | ||
1290 | static int notesize(struct memelfnote *en) | |
1291 | { | |
1292 | int sz; | |
1293 | ||
1294 | sz = sizeof(struct elf_note); | |
1295 | sz += roundup(strlen(en->name) + 1, 4); | |
1296 | sz += roundup(en->datasz, 4); | |
1297 | ||
1298 | return sz; | |
1299 | } | |
1300 | ||
1301 | /* #define DEBUG */ | |
1302 | ||
1303 | #define DUMP_WRITE(addr, nr) \ | |
1304 | do { if (!dump_write(file, (addr), (nr))) return 0; } while(0) | |
1305 | #define DUMP_SEEK(off) \ | |
1306 | do { if (!dump_seek(file, (off))) return 0; } while(0) | |
1307 | ||
1308 | static int writenote(struct memelfnote *men, struct file *file) | |
1309 | { | |
1310 | struct elf_note en; | |
1311 | ||
1312 | en.n_namesz = strlen(men->name) + 1; | |
1313 | en.n_descsz = men->datasz; | |
1314 | en.n_type = men->type; | |
1315 | ||
1316 | DUMP_WRITE(&en, sizeof(en)); | |
1317 | DUMP_WRITE(men->name, en.n_namesz); | |
1318 | /* XXX - cast from long long to long to avoid need for libgcc.a */ | |
1319 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ | |
1320 | DUMP_WRITE(men->data, men->datasz); | |
1321 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ | |
1322 | ||
1323 | return 1; | |
1324 | } | |
1325 | #undef DUMP_WRITE | |
1326 | #undef DUMP_SEEK | |
1327 | ||
1328 | #define DUMP_WRITE(addr, nr) \ | |
1329 | if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \ | |
1330 | goto end_coredump; | |
6d8c4e3b DH |
1331 | |
1332 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) | |
1333 | { | |
1334 | memcpy(elf->e_ident, ELFMAG, SELFMAG); | |
1335 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1336 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1337 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1338 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1339 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); | |
1340 | ||
1341 | elf->e_type = ET_CORE; | |
1342 | elf->e_machine = ELF_ARCH; | |
1343 | elf->e_version = EV_CURRENT; | |
1344 | elf->e_entry = 0; | |
1345 | elf->e_phoff = sizeof(struct elfhdr); | |
1346 | elf->e_shoff = 0; | |
1347 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS; | |
1348 | elf->e_ehsize = sizeof(struct elfhdr); | |
1349 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1350 | elf->e_phnum = segs; | |
1351 | elf->e_shentsize = 0; | |
1352 | elf->e_shnum = 0; | |
1353 | elf->e_shstrndx = 0; | |
1354 | return; | |
1355 | } | |
1356 | ||
1357 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) | |
1358 | { | |
1359 | phdr->p_type = PT_NOTE; | |
1360 | phdr->p_offset = offset; | |
1361 | phdr->p_vaddr = 0; | |
1362 | phdr->p_paddr = 0; | |
1363 | phdr->p_filesz = sz; | |
1364 | phdr->p_memsz = 0; | |
1365 | phdr->p_flags = 0; | |
1366 | phdr->p_align = 0; | |
1367 | return; | |
1368 | } | |
1369 | ||
1370 | static inline void fill_note(struct memelfnote *note, const char *name, int type, | |
1371 | unsigned int sz, void *data) | |
1372 | { | |
1373 | note->name = name; | |
1374 | note->type = type; | |
1375 | note->datasz = sz; | |
1376 | note->data = data; | |
1377 | return; | |
1378 | } | |
1379 | ||
1380 | /* | |
1381 | * fill up all the fields in prstatus from the given task struct, except | |
1382 | * registers which need to be filled up seperately. | |
1383 | */ | |
1384 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
1385 | struct task_struct *p, long signr) | |
1386 | { | |
1387 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1388 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1389 | prstatus->pr_sighold = p->blocked.sig[0]; | |
3b34fc58 ON |
1390 | rcu_read_lock(); |
1391 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1392 | rcu_read_unlock(); | |
b488893a | 1393 | prstatus->pr_pid = task_pid_vnr(p); |
b488893a PE |
1394 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1395 | prstatus->pr_sid = task_session_vnr(p); | |
6d8c4e3b | 1396 | if (thread_group_leader(p)) { |
2515ddc6 PM |
1397 | struct task_cputime cputime; |
1398 | ||
6d8c4e3b | 1399 | /* |
2515ddc6 PM |
1400 | * This is the record for the group leader. It shows the |
1401 | * group-wide total, not its individual thread total. | |
6d8c4e3b | 1402 | */ |
2515ddc6 PM |
1403 | thread_group_cputime(p, &cputime); |
1404 | cputime_to_timeval(cputime.utime, &prstatus->pr_utime); | |
1405 | cputime_to_timeval(cputime.stime, &prstatus->pr_stime); | |
6d8c4e3b DH |
1406 | } else { |
1407 | cputime_to_timeval(p->utime, &prstatus->pr_utime); | |
1408 | cputime_to_timeval(p->stime, &prstatus->pr_stime); | |
1409 | } | |
1410 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); | |
1411 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); | |
1412 | ||
1413 | prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; | |
1414 | prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; | |
1415 | } | |
1416 | ||
1417 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1418 | struct mm_struct *mm) | |
1419 | { | |
c69e8d9c | 1420 | const struct cred *cred; |
6d8c4e3b DH |
1421 | unsigned int i, len; |
1422 | ||
1423 | /* first copy the parameters from user space */ | |
1424 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1425 | ||
1426 | len = mm->arg_end - mm->arg_start; | |
1427 | if (len >= ELF_PRARGSZ) | |
1428 | len = ELF_PRARGSZ - 1; | |
1429 | if (copy_from_user(&psinfo->pr_psargs, | |
1430 | (const char __user *) mm->arg_start, len)) | |
1431 | return -EFAULT; | |
1432 | for (i = 0; i < len; i++) | |
1433 | if (psinfo->pr_psargs[i] == 0) | |
1434 | psinfo->pr_psargs[i] = ' '; | |
1435 | psinfo->pr_psargs[len] = 0; | |
1436 | ||
3b34fc58 ON |
1437 | rcu_read_lock(); |
1438 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1439 | rcu_read_unlock(); | |
b488893a | 1440 | psinfo->pr_pid = task_pid_vnr(p); |
b488893a PE |
1441 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1442 | psinfo->pr_sid = task_session_vnr(p); | |
6d8c4e3b DH |
1443 | |
1444 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1445 | psinfo->pr_state = i; | |
1446 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; | |
1447 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; | |
1448 | psinfo->pr_nice = task_nice(p); | |
1449 | psinfo->pr_flag = p->flags; | |
c69e8d9c DH |
1450 | rcu_read_lock(); |
1451 | cred = __task_cred(p); | |
1452 | SET_UID(psinfo->pr_uid, cred->uid); | |
1453 | SET_GID(psinfo->pr_gid, cred->gid); | |
1454 | rcu_read_unlock(); | |
6d8c4e3b DH |
1455 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1456 | ||
1457 | return 0; | |
1458 | } | |
1459 | ||
1460 | /* Here is the structure in which status of each thread is captured. */ | |
1461 | struct elf_thread_status | |
1462 | { | |
1463 | struct list_head list; | |
1464 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1465 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1466 | struct task_struct *thread; | |
1467 | #ifdef ELF_CORE_COPY_XFPREGS | |
5b20cd80 | 1468 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
6d8c4e3b DH |
1469 | #endif |
1470 | struct memelfnote notes[3]; | |
1471 | int num_notes; | |
1472 | }; | |
1473 | ||
1474 | /* | |
1475 | * In order to add the specific thread information for the elf file format, | |
1476 | * we need to keep a linked list of every thread's pr_status and then create | |
1477 | * a single section for them in the final core file. | |
1478 | */ | |
1479 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1480 | { | |
1481 | struct task_struct *p = t->thread; | |
1482 | int sz = 0; | |
1483 | ||
1484 | t->num_notes = 0; | |
1485 | ||
1486 | fill_prstatus(&t->prstatus, p, signr); | |
1487 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1488 | ||
1489 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), | |
1490 | &t->prstatus); | |
1491 | t->num_notes++; | |
1492 | sz += notesize(&t->notes[0]); | |
1493 | ||
1494 | t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu); | |
1495 | if (t->prstatus.pr_fpvalid) { | |
1496 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1497 | &t->fpu); | |
1498 | t->num_notes++; | |
1499 | sz += notesize(&t->notes[1]); | |
1500 | } | |
1501 | ||
1502 | #ifdef ELF_CORE_COPY_XFPREGS | |
1503 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
5b20cd80 MN |
1504 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1505 | sizeof(t->xfpu), &t->xfpu); | |
6d8c4e3b DH |
1506 | t->num_notes++; |
1507 | sz += notesize(&t->notes[2]); | |
1508 | } | |
1509 | #endif | |
1510 | return sz; | |
1511 | } | |
1512 | ||
1513 | /* | |
1514 | * dump the segments for an MMU process | |
1515 | */ | |
1516 | #ifdef CONFIG_MMU | |
e2e00906 | 1517 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
ee78b0a6 | 1518 | unsigned long *limit, unsigned long mm_flags) |
6d8c4e3b DH |
1519 | { |
1520 | struct vm_area_struct *vma; | |
f3e8fccd | 1521 | int err = 0; |
6d8c4e3b DH |
1522 | |
1523 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { | |
1524 | unsigned long addr; | |
1525 | ||
ee78b0a6 | 1526 | if (!maydump(vma, mm_flags)) |
6d8c4e3b DH |
1527 | continue; |
1528 | ||
f3e8fccd HD |
1529 | for (addr = vma->vm_start; addr < vma->vm_end; |
1530 | addr += PAGE_SIZE) { | |
1531 | struct page *page = get_dump_page(addr); | |
1532 | if (page) { | |
1533 | void *kaddr = kmap(page); | |
1534 | *size += PAGE_SIZE; | |
1535 | if (*size > *limit) | |
1536 | err = -EFBIG; | |
1537 | else if (!dump_write(file, kaddr, PAGE_SIZE)) | |
1538 | err = -EIO; | |
6d8c4e3b DH |
1539 | kunmap(page); |
1540 | page_cache_release(page); | |
f3e8fccd HD |
1541 | } else if (!dump_seek(file, file->f_pos + PAGE_SIZE)) |
1542 | err = -EFBIG; | |
1543 | if (err) | |
1544 | goto out; | |
6d8c4e3b DH |
1545 | } |
1546 | } | |
f3e8fccd HD |
1547 | out: |
1548 | return err; | |
6d8c4e3b DH |
1549 | } |
1550 | #endif | |
1551 | ||
1552 | /* | |
1553 | * dump the segments for a NOMMU process | |
1554 | */ | |
1555 | #ifndef CONFIG_MMU | |
e2e00906 | 1556 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
ee78b0a6 | 1557 | unsigned long *limit, unsigned long mm_flags) |
6d8c4e3b | 1558 | { |
8feae131 | 1559 | struct vm_area_struct *vma; |
6d8c4e3b | 1560 | |
8feae131 | 1561 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
ee78b0a6 | 1562 | if (!maydump(vma, mm_flags)) |
6d8c4e3b DH |
1563 | continue; |
1564 | ||
1565 | if ((*size += PAGE_SIZE) > *limit) | |
1566 | return -EFBIG; | |
1567 | ||
1568 | if (!dump_write(file, (void *) vma->vm_start, | |
1569 | vma->vm_end - vma->vm_start)) | |
1570 | return -EIO; | |
1571 | } | |
1572 | ||
1573 | return 0; | |
1574 | } | |
1575 | #endif | |
1576 | ||
1577 | /* | |
1578 | * Actual dumper | |
1579 | * | |
1580 | * This is a two-pass process; first we find the offsets of the bits, | |
1581 | * and then they are actually written out. If we run out of core limit | |
1582 | * we just truncate. | |
1583 | */ | |
1584 | static int elf_fdpic_core_dump(long signr, struct pt_regs *regs, | |
7dc0b22e | 1585 | struct file *file, unsigned long limit) |
6d8c4e3b DH |
1586 | { |
1587 | #define NUM_NOTES 6 | |
1588 | int has_dumped = 0; | |
1589 | mm_segment_t fs; | |
1590 | int segs; | |
1591 | size_t size = 0; | |
1592 | int i; | |
1593 | struct vm_area_struct *vma; | |
1594 | struct elfhdr *elf = NULL; | |
1595 | loff_t offset = 0, dataoff; | |
6d8c4e3b DH |
1596 | int numnote; |
1597 | struct memelfnote *notes = NULL; | |
1598 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ | |
1599 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ | |
6d8c4e3b DH |
1600 | LIST_HEAD(thread_list); |
1601 | struct list_head *t; | |
1602 | elf_fpregset_t *fpu = NULL; | |
1603 | #ifdef ELF_CORE_COPY_XFPREGS | |
1604 | elf_fpxregset_t *xfpu = NULL; | |
1605 | #endif | |
1606 | int thread_status_size = 0; | |
6d8c4e3b | 1607 | elf_addr_t *auxv; |
ee78b0a6 | 1608 | unsigned long mm_flags; |
6d8c4e3b DH |
1609 | |
1610 | /* | |
1611 | * We no longer stop all VM operations. | |
1612 | * | |
1613 | * This is because those proceses that could possibly change map_count | |
1614 | * or the mmap / vma pages are now blocked in do_exit on current | |
1615 | * finishing this core dump. | |
1616 | * | |
1617 | * Only ptrace can touch these memory addresses, but it doesn't change | |
1618 | * the map_count or the pages allocated. So no possibility of crashing | |
1619 | * exists while dumping the mm->vm_next areas to the core file. | |
1620 | */ | |
1621 | ||
1622 | /* alloc memory for large data structures: too large to be on stack */ | |
1623 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
1624 | if (!elf) | |
1625 | goto cleanup; | |
1626 | prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL); | |
1627 | if (!prstatus) | |
1628 | goto cleanup; | |
1629 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
1630 | if (!psinfo) | |
1631 | goto cleanup; | |
1632 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); | |
1633 | if (!notes) | |
1634 | goto cleanup; | |
1635 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); | |
1636 | if (!fpu) | |
1637 | goto cleanup; | |
1638 | #ifdef ELF_CORE_COPY_XFPREGS | |
1639 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); | |
1640 | if (!xfpu) | |
1641 | goto cleanup; | |
1642 | #endif | |
1643 | ||
1644 | if (signr) { | |
182c515f | 1645 | struct core_thread *ct; |
6d8c4e3b | 1646 | struct elf_thread_status *tmp; |
182c515f ON |
1647 | |
1648 | for (ct = current->mm->core_state->dumper.next; | |
1649 | ct; ct = ct->next) { | |
1650 | tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); | |
1651 | if (!tmp) | |
1652 | goto cleanup; | |
1653 | ||
1654 | tmp->thread = ct->task; | |
1655 | list_add(&tmp->list, &thread_list); | |
1656 | } | |
1657 | ||
6d8c4e3b DH |
1658 | list_for_each(t, &thread_list) { |
1659 | struct elf_thread_status *tmp; | |
1660 | int sz; | |
1661 | ||
1662 | tmp = list_entry(t, struct elf_thread_status, list); | |
1663 | sz = elf_dump_thread_status(signr, tmp); | |
1664 | thread_status_size += sz; | |
1665 | } | |
1666 | } | |
1667 | ||
1668 | /* now collect the dump for the current */ | |
1669 | fill_prstatus(prstatus, current, signr); | |
1670 | elf_core_copy_regs(&prstatus->pr_reg, regs); | |
1671 | ||
6d8c4e3b | 1672 | segs = current->mm->map_count; |
6d8c4e3b DH |
1673 | #ifdef ELF_CORE_EXTRA_PHDRS |
1674 | segs += ELF_CORE_EXTRA_PHDRS; | |
1675 | #endif | |
1676 | ||
1677 | /* Set up header */ | |
1678 | fill_elf_fdpic_header(elf, segs + 1); /* including notes section */ | |
1679 | ||
1680 | has_dumped = 1; | |
1681 | current->flags |= PF_DUMPCORE; | |
1682 | ||
1683 | /* | |
1684 | * Set up the notes in similar form to SVR4 core dumps made | |
1685 | * with info from their /proc. | |
1686 | */ | |
1687 | ||
1688 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); | |
1689 | fill_psinfo(psinfo, current->group_leader, current->mm); | |
1690 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); | |
1691 | ||
1692 | numnote = 2; | |
1693 | ||
1694 | auxv = (elf_addr_t *) current->mm->saved_auxv; | |
1695 | ||
1696 | i = 0; | |
1697 | do | |
1698 | i += 2; | |
1699 | while (auxv[i - 2] != AT_NULL); | |
1700 | fill_note(¬es[numnote++], "CORE", NT_AUXV, | |
1701 | i * sizeof(elf_addr_t), auxv); | |
1702 | ||
1703 | /* Try to dump the FPU. */ | |
1704 | if ((prstatus->pr_fpvalid = | |
1705 | elf_core_copy_task_fpregs(current, regs, fpu))) | |
1706 | fill_note(notes + numnote++, | |
1707 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); | |
1708 | #ifdef ELF_CORE_COPY_XFPREGS | |
1709 | if (elf_core_copy_task_xfpregs(current, xfpu)) | |
1710 | fill_note(notes + numnote++, | |
5b20cd80 | 1711 | "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu); |
6d8c4e3b DH |
1712 | #endif |
1713 | ||
1714 | fs = get_fs(); | |
1715 | set_fs(KERNEL_DS); | |
1716 | ||
1717 | DUMP_WRITE(elf, sizeof(*elf)); | |
1718 | offset += sizeof(*elf); /* Elf header */ | |
1719 | offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */ | |
1720 | ||
1721 | /* Write notes phdr entry */ | |
1722 | { | |
1723 | struct elf_phdr phdr; | |
1724 | int sz = 0; | |
1725 | ||
1726 | for (i = 0; i < numnote; i++) | |
1727 | sz += notesize(notes + i); | |
1728 | ||
1729 | sz += thread_status_size; | |
1730 | ||
1731 | fill_elf_note_phdr(&phdr, sz, offset); | |
1732 | offset += sz; | |
1733 | DUMP_WRITE(&phdr, sizeof(phdr)); | |
1734 | } | |
1735 | ||
1736 | /* Page-align dumped data */ | |
1737 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); | |
1738 | ||
ee78b0a6 KH |
1739 | /* |
1740 | * We must use the same mm->flags while dumping core to avoid | |
1741 | * inconsistency between the program headers and bodies, otherwise an | |
1742 | * unusable core file can be generated. | |
1743 | */ | |
1744 | mm_flags = current->mm->flags; | |
1745 | ||
6d8c4e3b | 1746 | /* write program headers for segments dump */ |
8feae131 | 1747 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
6d8c4e3b DH |
1748 | struct elf_phdr phdr; |
1749 | size_t sz; | |
1750 | ||
6d8c4e3b DH |
1751 | sz = vma->vm_end - vma->vm_start; |
1752 | ||
1753 | phdr.p_type = PT_LOAD; | |
1754 | phdr.p_offset = offset; | |
1755 | phdr.p_vaddr = vma->vm_start; | |
1756 | phdr.p_paddr = 0; | |
ee78b0a6 | 1757 | phdr.p_filesz = maydump(vma, mm_flags) ? sz : 0; |
6d8c4e3b DH |
1758 | phdr.p_memsz = sz; |
1759 | offset += phdr.p_filesz; | |
1760 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
1761 | if (vma->vm_flags & VM_WRITE) | |
1762 | phdr.p_flags |= PF_W; | |
1763 | if (vma->vm_flags & VM_EXEC) | |
1764 | phdr.p_flags |= PF_X; | |
1765 | phdr.p_align = ELF_EXEC_PAGESIZE; | |
1766 | ||
1767 | DUMP_WRITE(&phdr, sizeof(phdr)); | |
1768 | } | |
1769 | ||
1770 | #ifdef ELF_CORE_WRITE_EXTRA_PHDRS | |
1771 | ELF_CORE_WRITE_EXTRA_PHDRS; | |
1772 | #endif | |
1773 | ||
1774 | /* write out the notes section */ | |
1775 | for (i = 0; i < numnote; i++) | |
1776 | if (!writenote(notes + i, file)) | |
1777 | goto end_coredump; | |
1778 | ||
1779 | /* write out the thread status notes section */ | |
1780 | list_for_each(t, &thread_list) { | |
1781 | struct elf_thread_status *tmp = | |
1782 | list_entry(t, struct elf_thread_status, list); | |
1783 | ||
1784 | for (i = 0; i < tmp->num_notes; i++) | |
1785 | if (!writenote(&tmp->notes[i], file)) | |
1786 | goto end_coredump; | |
1787 | } | |
1788 | ||
f3e8fccd HD |
1789 | if (!dump_seek(file, dataoff)) |
1790 | goto end_coredump; | |
6d8c4e3b | 1791 | |
ee78b0a6 | 1792 | if (elf_fdpic_dump_segments(file, &size, &limit, mm_flags) < 0) |
6d8c4e3b DH |
1793 | goto end_coredump; |
1794 | ||
1795 | #ifdef ELF_CORE_WRITE_EXTRA_DATA | |
1796 | ELF_CORE_WRITE_EXTRA_DATA; | |
1797 | #endif | |
1798 | ||
1799 | if (file->f_pos != offset) { | |
1800 | /* Sanity check */ | |
1801 | printk(KERN_WARNING | |
1802 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", | |
1803 | file->f_pos, offset); | |
1804 | } | |
1805 | ||
1806 | end_coredump: | |
1807 | set_fs(fs); | |
1808 | ||
1809 | cleanup: | |
1810 | while (!list_empty(&thread_list)) { | |
1811 | struct list_head *tmp = thread_list.next; | |
1812 | list_del(tmp); | |
1813 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
1814 | } | |
1815 | ||
1816 | kfree(elf); | |
1817 | kfree(prstatus); | |
1818 | kfree(psinfo); | |
1819 | kfree(notes); | |
1820 | kfree(fpu); | |
1821 | #ifdef ELF_CORE_COPY_XFPREGS | |
1822 | kfree(xfpu); | |
1823 | #endif | |
1824 | return has_dumped; | |
1825 | #undef NUM_NOTES | |
1826 | } | |
1827 | ||
1828 | #endif /* USE_ELF_CORE_DUMP */ |