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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 | |
698ba7b5 | 78 | #ifdef CONFIG_ELF_CORE |
f6151dfe | 79 | static int elf_fdpic_core_dump(struct coredump_params *cprm); |
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, | |
698ba7b5 | 85 | #ifdef CONFIG_ELF_CORE |
6d8c4e3b DH |
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; | |
04e4f2b1 MF |
173 | #endif |
174 | #ifndef CONFIG_MMU | |
175 | unsigned long stack_prot; | |
8a2ab7f5 | 176 | #endif |
1da177e4 LT |
177 | struct file *interpreter = NULL; /* to shut gcc up */ |
178 | char *interpreter_name = NULL; | |
179 | int executable_stack; | |
180 | int retval, i; | |
181 | ||
aa289b47 DH |
182 | kdebug("____ LOAD %d ____", current->pid); |
183 | ||
1da177e4 LT |
184 | memset(&exec_params, 0, sizeof(exec_params)); |
185 | memset(&interp_params, 0, sizeof(interp_params)); | |
186 | ||
187 | exec_params.hdr = *(struct elfhdr *) bprm->buf; | |
188 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; | |
189 | ||
190 | /* check that this is a binary we know how to deal with */ | |
191 | retval = -ENOEXEC; | |
192 | if (!is_elf_fdpic(&exec_params.hdr, bprm->file)) | |
193 | goto error; | |
194 | ||
195 | /* read the program header table */ | |
196 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); | |
197 | if (retval < 0) | |
198 | goto error; | |
199 | ||
200 | /* scan for a program header that specifies an interpreter */ | |
201 | phdr = exec_params.phdrs; | |
202 | ||
203 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { | |
204 | switch (phdr->p_type) { | |
205 | case PT_INTERP: | |
206 | retval = -ENOMEM; | |
207 | if (phdr->p_filesz > PATH_MAX) | |
208 | goto error; | |
209 | retval = -ENOENT; | |
210 | if (phdr->p_filesz < 2) | |
211 | goto error; | |
212 | ||
213 | /* read the name of the interpreter into memory */ | |
792db3af | 214 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
1da177e4 LT |
215 | if (!interpreter_name) |
216 | goto error; | |
217 | ||
218 | retval = kernel_read(bprm->file, | |
219 | phdr->p_offset, | |
220 | interpreter_name, | |
221 | phdr->p_filesz); | |
e1d2c8b6 DH |
222 | if (unlikely(retval != phdr->p_filesz)) { |
223 | if (retval >= 0) | |
224 | retval = -ENOEXEC; | |
1da177e4 | 225 | goto error; |
e1d2c8b6 | 226 | } |
1da177e4 LT |
227 | |
228 | retval = -ENOENT; | |
229 | if (interpreter_name[phdr->p_filesz - 1] != '\0') | |
230 | goto error; | |
231 | ||
232 | kdebug("Using ELF interpreter %s", interpreter_name); | |
233 | ||
234 | /* replace the program with the interpreter */ | |
235 | interpreter = open_exec(interpreter_name); | |
236 | retval = PTR_ERR(interpreter); | |
237 | if (IS_ERR(interpreter)) { | |
238 | interpreter = NULL; | |
239 | goto error; | |
240 | } | |
241 | ||
1fb84496 AD |
242 | /* |
243 | * If the binary is not readable then enforce | |
244 | * mm->dumpable = 0 regardless of the interpreter's | |
245 | * permissions. | |
246 | */ | |
247 | if (file_permission(interpreter, MAY_READ) < 0) | |
248 | bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; | |
249 | ||
8a2ab7f5 DH |
250 | retval = kernel_read(interpreter, 0, bprm->buf, |
251 | BINPRM_BUF_SIZE); | |
e1d2c8b6 DH |
252 | if (unlikely(retval != BINPRM_BUF_SIZE)) { |
253 | if (retval >= 0) | |
254 | retval = -ENOEXEC; | |
1da177e4 | 255 | goto error; |
e1d2c8b6 | 256 | } |
1da177e4 LT |
257 | |
258 | interp_params.hdr = *((struct elfhdr *) bprm->buf); | |
259 | break; | |
260 | ||
261 | case PT_LOAD: | |
262 | #ifdef CONFIG_MMU | |
263 | if (exec_params.load_addr == 0) | |
264 | exec_params.load_addr = phdr->p_vaddr; | |
265 | #endif | |
266 | break; | |
267 | } | |
268 | ||
269 | } | |
270 | ||
271 | if (elf_check_const_displacement(&exec_params.hdr)) | |
272 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; | |
273 | ||
274 | /* perform insanity checks on the interpreter */ | |
275 | if (interpreter_name) { | |
276 | retval = -ELIBBAD; | |
277 | if (!is_elf_fdpic(&interp_params.hdr, interpreter)) | |
278 | goto error; | |
279 | ||
280 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT; | |
281 | ||
282 | /* read the interpreter's program header table */ | |
283 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); | |
284 | if (retval < 0) | |
285 | goto error; | |
286 | } | |
287 | ||
288 | stack_size = exec_params.stack_size; | |
1da177e4 LT |
289 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
290 | executable_stack = EXSTACK_ENABLE_X; | |
291 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) | |
292 | executable_stack = EXSTACK_DISABLE_X; | |
1da177e4 LT |
293 | else |
294 | executable_stack = EXSTACK_DEFAULT; | |
295 | ||
8e8b63a6 DH |
296 | if (stack_size == 0) { |
297 | stack_size = interp_params.stack_size; | |
298 | if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) | |
299 | executable_stack = EXSTACK_ENABLE_X; | |
300 | else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) | |
301 | executable_stack = EXSTACK_DISABLE_X; | |
302 | else | |
303 | executable_stack = EXSTACK_DEFAULT; | |
304 | } | |
305 | ||
1da177e4 LT |
306 | retval = -ENOEXEC; |
307 | if (stack_size == 0) | |
308 | goto error; | |
309 | ||
310 | if (elf_check_const_displacement(&interp_params.hdr)) | |
311 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; | |
312 | ||
313 | /* flush all traces of the currently running executable */ | |
314 | retval = flush_old_exec(bprm); | |
315 | if (retval) | |
316 | goto error; | |
317 | ||
318 | /* there's now no turning back... the old userspace image is dead, | |
319 | * defunct, deceased, etc. after this point we have to exit via | |
320 | * error_kill */ | |
321 | set_personality(PER_LINUX_FDPIC); | |
04e4f2b1 MF |
322 | if (elf_read_implies_exec(&exec_params.hdr, executable_stack)) |
323 | current->personality |= READ_IMPLIES_EXEC; | |
221af7f8 LT |
324 | |
325 | setup_new_exec(bprm); | |
326 | ||
1da177e4 LT |
327 | set_binfmt(&elf_fdpic_format); |
328 | ||
329 | current->mm->start_code = 0; | |
330 | current->mm->end_code = 0; | |
331 | current->mm->start_stack = 0; | |
332 | current->mm->start_data = 0; | |
333 | current->mm->end_data = 0; | |
334 | current->mm->context.exec_fdpic_loadmap = 0; | |
335 | current->mm->context.interp_fdpic_loadmap = 0; | |
336 | ||
337 | current->flags &= ~PF_FORKNOEXEC; | |
338 | ||
339 | #ifdef CONFIG_MMU | |
340 | elf_fdpic_arch_lay_out_mm(&exec_params, | |
341 | &interp_params, | |
342 | ¤t->mm->start_stack, | |
343 | ¤t->mm->start_brk); | |
1da177e4 | 344 | |
8a2ab7f5 DH |
345 | retval = setup_arg_pages(bprm, current->mm->start_stack, |
346 | executable_stack); | |
1da177e4 LT |
347 | if (retval < 0) { |
348 | send_sig(SIGKILL, current, 0); | |
349 | goto error_kill; | |
350 | } | |
351 | #endif | |
352 | ||
353 | /* load the executable and interpreter into memory */ | |
8a2ab7f5 DH |
354 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
355 | "executable"); | |
1da177e4 LT |
356 | if (retval < 0) |
357 | goto error_kill; | |
358 | ||
359 | if (interpreter_name) { | |
360 | retval = elf_fdpic_map_file(&interp_params, interpreter, | |
361 | current->mm, "interpreter"); | |
362 | if (retval < 0) { | |
363 | printk(KERN_ERR "Unable to load interpreter\n"); | |
364 | goto error_kill; | |
365 | } | |
366 | ||
367 | allow_write_access(interpreter); | |
368 | fput(interpreter); | |
369 | interpreter = NULL; | |
370 | } | |
371 | ||
372 | #ifdef CONFIG_MMU | |
373 | if (!current->mm->start_brk) | |
374 | current->mm->start_brk = current->mm->end_data; | |
375 | ||
8a2ab7f5 DH |
376 | current->mm->brk = current->mm->start_brk = |
377 | PAGE_ALIGN(current->mm->start_brk); | |
1da177e4 LT |
378 | |
379 | #else | |
380 | /* create a stack and brk area big enough for everyone | |
381 | * - the brk heap starts at the bottom and works up | |
382 | * - the stack starts at the top and works down | |
383 | */ | |
384 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; | |
385 | if (stack_size < PAGE_SIZE * 2) | |
386 | stack_size = PAGE_SIZE * 2; | |
387 | ||
04e4f2b1 MF |
388 | stack_prot = PROT_READ | PROT_WRITE; |
389 | if (executable_stack == EXSTACK_ENABLE_X || | |
390 | (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC)) | |
391 | stack_prot |= PROT_EXEC; | |
392 | ||
1da177e4 | 393 | down_write(¤t->mm->mmap_sem); |
04e4f2b1 | 394 | current->mm->start_brk = do_mmap(NULL, 0, stack_size, stack_prot, |
ea637639 JZ |
395 | MAP_PRIVATE | MAP_ANONYMOUS | |
396 | MAP_UNINITIALIZED | MAP_GROWSDOWN, | |
1da177e4 LT |
397 | 0); |
398 | ||
8a2ab7f5 | 399 | if (IS_ERR_VALUE(current->mm->start_brk)) { |
1da177e4 LT |
400 | up_write(¤t->mm->mmap_sem); |
401 | retval = current->mm->start_brk; | |
402 | current->mm->start_brk = 0; | |
403 | goto error_kill; | |
404 | } | |
405 | ||
1da177e4 LT |
406 | up_write(¤t->mm->mmap_sem); |
407 | ||
408 | current->mm->brk = current->mm->start_brk; | |
409 | current->mm->context.end_brk = current->mm->start_brk; | |
8a2ab7f5 DH |
410 | current->mm->context.end_brk += |
411 | (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0; | |
1da177e4 LT |
412 | current->mm->start_stack = current->mm->start_brk + stack_size; |
413 | #endif | |
414 | ||
a6f76f23 | 415 | install_exec_creds(bprm); |
1da177e4 | 416 | current->flags &= ~PF_FORKNOEXEC; |
8a2ab7f5 DH |
417 | if (create_elf_fdpic_tables(bprm, current->mm, |
418 | &exec_params, &interp_params) < 0) | |
1da177e4 LT |
419 | goto error_kill; |
420 | ||
8a2ab7f5 DH |
421 | kdebug("- start_code %lx", current->mm->start_code); |
422 | kdebug("- end_code %lx", current->mm->end_code); | |
423 | kdebug("- start_data %lx", current->mm->start_data); | |
424 | kdebug("- end_data %lx", current->mm->end_data); | |
425 | kdebug("- start_brk %lx", current->mm->start_brk); | |
426 | kdebug("- brk %lx", current->mm->brk); | |
427 | kdebug("- start_stack %lx", current->mm->start_stack); | |
1da177e4 LT |
428 | |
429 | #ifdef ELF_FDPIC_PLAT_INIT | |
430 | /* | |
431 | * The ABI may specify that certain registers be set up in special | |
432 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
433 | * example. This macro performs whatever initialization to | |
434 | * the regs structure is required. | |
435 | */ | |
8a2ab7f5 DH |
436 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; |
437 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, | |
438 | dynaddr); | |
1da177e4 LT |
439 | #endif |
440 | ||
441 | /* everything is now ready... get the userspace context ready to roll */ | |
8a2ab7f5 DH |
442 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
443 | start_thread(regs, entryaddr, current->mm->start_stack); | |
1da177e4 | 444 | |
1da177e4 LT |
445 | retval = 0; |
446 | ||
447 | error: | |
448 | if (interpreter) { | |
449 | allow_write_access(interpreter); | |
450 | fput(interpreter); | |
451 | } | |
f99d49ad JJ |
452 | kfree(interpreter_name); |
453 | kfree(exec_params.phdrs); | |
454 | kfree(exec_params.loadmap); | |
455 | kfree(interp_params.phdrs); | |
456 | kfree(interp_params.loadmap); | |
1da177e4 LT |
457 | return retval; |
458 | ||
459 | /* unrecoverable error - kill the process */ | |
8a2ab7f5 | 460 | error_kill: |
1da177e4 LT |
461 | send_sig(SIGSEGV, current, 0); |
462 | goto error; | |
463 | ||
8a2ab7f5 | 464 | } |
1da177e4 LT |
465 | |
466 | /*****************************************************************************/ | |
ec23847d PM |
467 | |
468 | #ifndef ELF_BASE_PLATFORM | |
469 | /* | |
470 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. | |
471 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value | |
472 | * will be copied to the user stack in the same manner as AT_PLATFORM. | |
473 | */ | |
474 | #define ELF_BASE_PLATFORM NULL | |
475 | #endif | |
476 | ||
1da177e4 | 477 | /* |
c7637941 PM |
478 | * present useful information to the program by shovelling it onto the new |
479 | * process's stack | |
1da177e4 LT |
480 | */ |
481 | static int create_elf_fdpic_tables(struct linux_binprm *bprm, | |
482 | struct mm_struct *mm, | |
483 | struct elf_fdpic_params *exec_params, | |
484 | struct elf_fdpic_params *interp_params) | |
485 | { | |
86a264ab | 486 | const struct cred *cred = current_cred(); |
1da177e4 | 487 | unsigned long sp, csp, nitems; |
530018bf | 488 | elf_caddr_t __user *argv, *envp; |
1da177e4 | 489 | size_t platform_len = 0, len; |
ec23847d PM |
490 | char *k_platform, *k_base_platform; |
491 | char __user *u_platform, *u_base_platform, *p; | |
1da177e4 LT |
492 | long hwcap; |
493 | int loop; | |
9b14ec35 | 494 | int nr; /* reset for each csp adjustment */ |
1da177e4 | 495 | |
1da177e4 | 496 | #ifdef CONFIG_MMU |
c7637941 PM |
497 | /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions |
498 | * by the processes running on the same package. One thing we can do is | |
499 | * to shuffle the initial stack for them, so we give the architecture | |
500 | * an opportunity to do so here. | |
501 | */ | |
502 | sp = arch_align_stack(bprm->p); | |
1da177e4 LT |
503 | #else |
504 | sp = mm->start_stack; | |
505 | ||
506 | /* stack the program arguments and environment */ | |
507 | if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0) | |
508 | return -EFAULT; | |
509 | #endif | |
510 | ||
1da177e4 | 511 | hwcap = ELF_HWCAP; |
ec23847d PM |
512 | |
513 | /* | |
514 | * If this architecture has a platform capability string, copy it | |
515 | * to userspace. In some cases (Sparc), this info is impossible | |
516 | * for userspace to get any other way, in others (i386) it is | |
517 | * merely difficult. | |
518 | */ | |
1da177e4 | 519 | k_platform = ELF_PLATFORM; |
1aeb21d6 | 520 | u_platform = NULL; |
1da177e4 LT |
521 | |
522 | if (k_platform) { | |
523 | platform_len = strlen(k_platform) + 1; | |
524 | sp -= platform_len; | |
530018bf | 525 | u_platform = (char __user *) sp; |
1da177e4 LT |
526 | if (__copy_to_user(u_platform, k_platform, platform_len) != 0) |
527 | return -EFAULT; | |
528 | } | |
529 | ||
ec23847d PM |
530 | /* |
531 | * If this architecture has a "base" platform capability | |
532 | * string, copy it to userspace. | |
533 | */ | |
534 | k_base_platform = ELF_BASE_PLATFORM; | |
535 | u_base_platform = NULL; | |
536 | ||
537 | if (k_base_platform) { | |
538 | platform_len = strlen(k_base_platform) + 1; | |
539 | sp -= platform_len; | |
540 | u_base_platform = (char __user *) sp; | |
541 | if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0) | |
542 | return -EFAULT; | |
543 | } | |
544 | ||
1da177e4 LT |
545 | sp &= ~7UL; |
546 | ||
547 | /* stack the load map(s) */ | |
548 | len = sizeof(struct elf32_fdpic_loadmap); | |
549 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; | |
550 | sp = (sp - len) & ~7UL; | |
551 | exec_params->map_addr = sp; | |
552 | ||
530018bf | 553 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
1da177e4 LT |
554 | return -EFAULT; |
555 | ||
556 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; | |
557 | ||
558 | if (interp_params->loadmap) { | |
559 | len = sizeof(struct elf32_fdpic_loadmap); | |
8a2ab7f5 DH |
560 | len += sizeof(struct elf32_fdpic_loadseg) * |
561 | interp_params->loadmap->nsegs; | |
1da177e4 LT |
562 | sp = (sp - len) & ~7UL; |
563 | interp_params->map_addr = sp; | |
564 | ||
8a2ab7f5 DH |
565 | if (copy_to_user((void __user *) sp, interp_params->loadmap, |
566 | len) != 0) | |
1da177e4 LT |
567 | return -EFAULT; |
568 | ||
569 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; | |
570 | } | |
571 | ||
572 | /* force 16 byte _final_ alignment here for generality */ | |
5edc2a51 | 573 | #define DLINFO_ITEMS 15 |
1da177e4 | 574 | |
ec23847d PM |
575 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + |
576 | (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH; | |
1da177e4 | 577 | |
5edc2a51 PM |
578 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) |
579 | nitems++; | |
580 | ||
1da177e4 LT |
581 | csp = sp; |
582 | sp -= nitems * 2 * sizeof(unsigned long); | |
583 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ | |
584 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ | |
585 | sp -= 1 * sizeof(unsigned long); /* argc */ | |
586 | ||
587 | csp -= sp & 15UL; | |
588 | sp -= sp & 15UL; | |
589 | ||
590 | /* put the ELF interpreter info on the stack */ | |
9b14ec35 | 591 | #define NEW_AUX_ENT(id, val) \ |
8a2ab7f5 DH |
592 | do { \ |
593 | struct { unsigned long _id, _val; } __user *ent; \ | |
594 | \ | |
595 | ent = (void __user *) csp; \ | |
596 | __put_user((id), &ent[nr]._id); \ | |
597 | __put_user((val), &ent[nr]._val); \ | |
9b14ec35 | 598 | nr++; \ |
1da177e4 LT |
599 | } while (0) |
600 | ||
9b14ec35 | 601 | nr = 0; |
1da177e4 | 602 | csp -= 2 * sizeof(unsigned long); |
9b14ec35 | 603 | NEW_AUX_ENT(AT_NULL, 0); |
1da177e4 | 604 | if (k_platform) { |
9b14ec35 | 605 | nr = 0; |
1da177e4 | 606 | csp -= 2 * sizeof(unsigned long); |
9b14ec35 | 607 | NEW_AUX_ENT(AT_PLATFORM, |
8a2ab7f5 | 608 | (elf_addr_t) (unsigned long) u_platform); |
1da177e4 LT |
609 | } |
610 | ||
ec23847d PM |
611 | if (k_base_platform) { |
612 | nr = 0; | |
613 | csp -= 2 * sizeof(unsigned long); | |
614 | NEW_AUX_ENT(AT_BASE_PLATFORM, | |
615 | (elf_addr_t) (unsigned long) u_base_platform); | |
616 | } | |
617 | ||
5edc2a51 PM |
618 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
619 | nr = 0; | |
620 | csp -= 2 * sizeof(unsigned long); | |
621 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); | |
622 | } | |
623 | ||
9b14ec35 | 624 | nr = 0; |
1da177e4 | 625 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); |
9b14ec35 PM |
626 | NEW_AUX_ENT(AT_HWCAP, hwcap); |
627 | NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE); | |
628 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
629 | NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr); | |
630 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); | |
631 | NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum); | |
632 | NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr); | |
633 | NEW_AUX_ENT(AT_FLAGS, 0); | |
634 | NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr); | |
86a264ab DH |
635 | NEW_AUX_ENT(AT_UID, (elf_addr_t) cred->uid); |
636 | NEW_AUX_ENT(AT_EUID, (elf_addr_t) cred->euid); | |
637 | NEW_AUX_ENT(AT_GID, (elf_addr_t) cred->gid); | |
638 | NEW_AUX_ENT(AT_EGID, (elf_addr_t) cred->egid); | |
5edc2a51 PM |
639 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
640 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); | |
1da177e4 LT |
641 | |
642 | #ifdef ARCH_DLINFO | |
9b14ec35 PM |
643 | nr = 0; |
644 | csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long); | |
645 | ||
1da177e4 LT |
646 | /* ARCH_DLINFO must come last so platform specific code can enforce |
647 | * special alignment requirements on the AUXV if necessary (eg. PPC). | |
648 | */ | |
649 | ARCH_DLINFO; | |
650 | #endif | |
651 | #undef NEW_AUX_ENT | |
652 | ||
653 | /* allocate room for argv[] and envv[] */ | |
654 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); | |
530018bf | 655 | envp = (elf_caddr_t __user *) csp; |
1da177e4 | 656 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
530018bf | 657 | argv = (elf_caddr_t __user *) csp; |
1da177e4 LT |
658 | |
659 | /* stack argc */ | |
660 | csp -= sizeof(unsigned long); | |
530018bf | 661 | __put_user(bprm->argc, (unsigned long __user *) csp); |
1da177e4 | 662 | |
88bcd512 | 663 | BUG_ON(csp != sp); |
1da177e4 LT |
664 | |
665 | /* fill in the argv[] array */ | |
666 | #ifdef CONFIG_MMU | |
667 | current->mm->arg_start = bprm->p; | |
668 | #else | |
8a2ab7f5 DH |
669 | current->mm->arg_start = current->mm->start_stack - |
670 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); | |
1da177e4 LT |
671 | #endif |
672 | ||
530018bf | 673 | p = (char __user *) current->mm->arg_start; |
1da177e4 LT |
674 | for (loop = bprm->argc; loop > 0; loop--) { |
675 | __put_user((elf_caddr_t) p, argv++); | |
b6a2fea3 OW |
676 | len = strnlen_user(p, MAX_ARG_STRLEN); |
677 | if (!len || len > MAX_ARG_STRLEN) | |
1da177e4 LT |
678 | return -EINVAL; |
679 | p += len; | |
680 | } | |
681 | __put_user(NULL, argv); | |
682 | current->mm->arg_end = (unsigned long) p; | |
683 | ||
684 | /* fill in the envv[] array */ | |
685 | current->mm->env_start = (unsigned long) p; | |
686 | for (loop = bprm->envc; loop > 0; loop--) { | |
687 | __put_user((elf_caddr_t)(unsigned long) p, envp++); | |
b6a2fea3 OW |
688 | len = strnlen_user(p, MAX_ARG_STRLEN); |
689 | if (!len || len > MAX_ARG_STRLEN) | |
1da177e4 LT |
690 | return -EINVAL; |
691 | p += len; | |
692 | } | |
693 | __put_user(NULL, envp); | |
694 | current->mm->env_end = (unsigned long) p; | |
695 | ||
696 | mm->start_stack = (unsigned long) sp; | |
697 | return 0; | |
8a2ab7f5 | 698 | } |
1da177e4 LT |
699 | |
700 | /*****************************************************************************/ | |
701 | /* | |
702 | * transfer the program arguments and environment from the holding pages onto | |
703 | * the stack | |
704 | */ | |
705 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
706 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm, |
707 | unsigned long *_sp) | |
1da177e4 LT |
708 | { |
709 | unsigned long index, stop, sp; | |
710 | char *src; | |
711 | int ret = 0; | |
712 | ||
713 | stop = bprm->p >> PAGE_SHIFT; | |
714 | sp = *_sp; | |
715 | ||
716 | for (index = MAX_ARG_PAGES - 1; index >= stop; index--) { | |
717 | src = kmap(bprm->page[index]); | |
718 | sp -= PAGE_SIZE; | |
719 | if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0) | |
720 | ret = -EFAULT; | |
721 | kunmap(bprm->page[index]); | |
722 | if (ret < 0) | |
723 | goto out; | |
724 | } | |
725 | ||
726 | *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15; | |
727 | ||
8a2ab7f5 | 728 | out: |
1da177e4 | 729 | return ret; |
8a2ab7f5 | 730 | } |
1da177e4 LT |
731 | #endif |
732 | ||
733 | /*****************************************************************************/ | |
734 | /* | |
735 | * load the appropriate binary image (executable or interpreter) into memory | |
736 | * - we assume no MMU is available | |
737 | * - if no other PIC bits are set in params->hdr->e_flags | |
738 | * - we assume that the LOADable segments in the binary are independently relocatable | |
739 | * - we assume R/O executable segments are shareable | |
740 | * - else | |
741 | * - we assume the loadable parts of the image to require fixed displacement | |
742 | * - the image is not shareable | |
743 | */ | |
744 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, | |
745 | struct file *file, | |
746 | struct mm_struct *mm, | |
747 | const char *what) | |
748 | { | |
749 | struct elf32_fdpic_loadmap *loadmap; | |
750 | #ifdef CONFIG_MMU | |
751 | struct elf32_fdpic_loadseg *mseg; | |
752 | #endif | |
753 | struct elf32_fdpic_loadseg *seg; | |
754 | struct elf32_phdr *phdr; | |
755 | unsigned long load_addr, stop; | |
756 | unsigned nloads, tmp; | |
757 | size_t size; | |
758 | int loop, ret; | |
759 | ||
760 | /* allocate a load map table */ | |
761 | nloads = 0; | |
762 | for (loop = 0; loop < params->hdr.e_phnum; loop++) | |
763 | if (params->phdrs[loop].p_type == PT_LOAD) | |
764 | nloads++; | |
765 | ||
766 | if (nloads == 0) | |
767 | return -ELIBBAD; | |
768 | ||
769 | size = sizeof(*loadmap) + nloads * sizeof(*seg); | |
b87576d5 | 770 | loadmap = kzalloc(size, GFP_KERNEL); |
1da177e4 LT |
771 | if (!loadmap) |
772 | return -ENOMEM; | |
773 | ||
774 | params->loadmap = loadmap; | |
1da177e4 LT |
775 | |
776 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; | |
777 | loadmap->nsegs = nloads; | |
778 | ||
779 | load_addr = params->load_addr; | |
780 | seg = loadmap->segs; | |
781 | ||
782 | /* map the requested LOADs into the memory space */ | |
783 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
784 | case ELF_FDPIC_FLAG_CONSTDISP: | |
785 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
786 | #ifndef CONFIG_MMU | |
787 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); | |
788 | if (ret < 0) | |
789 | return ret; | |
790 | break; | |
791 | #endif | |
792 | default: | |
793 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); | |
794 | if (ret < 0) | |
795 | return ret; | |
796 | break; | |
797 | } | |
798 | ||
799 | /* map the entry point */ | |
800 | if (params->hdr.e_entry) { | |
801 | seg = loadmap->segs; | |
802 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
803 | if (params->hdr.e_entry >= seg->p_vaddr && | |
8a2ab7f5 | 804 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
1da177e4 | 805 | params->entry_addr = |
8a2ab7f5 DH |
806 | (params->hdr.e_entry - seg->p_vaddr) + |
807 | seg->addr; | |
1da177e4 LT |
808 | break; |
809 | } | |
810 | } | |
811 | } | |
812 | ||
813 | /* determine where the program header table has wound up if mapped */ | |
8a2ab7f5 DH |
814 | stop = params->hdr.e_phoff; |
815 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); | |
1da177e4 LT |
816 | phdr = params->phdrs; |
817 | ||
818 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
819 | if (phdr->p_type != PT_LOAD) | |
820 | continue; | |
821 | ||
822 | if (phdr->p_offset > params->hdr.e_phoff || | |
823 | phdr->p_offset + phdr->p_filesz < stop) | |
824 | continue; | |
825 | ||
826 | seg = loadmap->segs; | |
827 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
828 | if (phdr->p_vaddr >= seg->p_vaddr && | |
8a2ab7f5 DH |
829 | phdr->p_vaddr + phdr->p_filesz <= |
830 | seg->p_vaddr + seg->p_memsz) { | |
831 | params->ph_addr = | |
832 | (phdr->p_vaddr - seg->p_vaddr) + | |
833 | seg->addr + | |
1da177e4 LT |
834 | params->hdr.e_phoff - phdr->p_offset; |
835 | break; | |
836 | } | |
837 | } | |
838 | break; | |
839 | } | |
840 | ||
841 | /* determine where the dynamic section has wound up if there is one */ | |
842 | phdr = params->phdrs; | |
843 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
844 | if (phdr->p_type != PT_DYNAMIC) | |
845 | continue; | |
846 | ||
847 | seg = loadmap->segs; | |
848 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
849 | if (phdr->p_vaddr >= seg->p_vaddr && | |
8a2ab7f5 DH |
850 | phdr->p_vaddr + phdr->p_memsz <= |
851 | seg->p_vaddr + seg->p_memsz) { | |
852 | params->dynamic_addr = | |
853 | (phdr->p_vaddr - seg->p_vaddr) + | |
854 | seg->addr; | |
855 | ||
856 | /* check the dynamic section contains at least | |
857 | * one item, and that the last item is a NULL | |
858 | * entry */ | |
1da177e4 LT |
859 | if (phdr->p_memsz == 0 || |
860 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) | |
861 | goto dynamic_error; | |
862 | ||
863 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); | |
8a2ab7f5 DH |
864 | if (((Elf32_Dyn *) |
865 | params->dynamic_addr)[tmp - 1].d_tag != 0) | |
1da177e4 LT |
866 | goto dynamic_error; |
867 | break; | |
868 | } | |
869 | } | |
870 | break; | |
871 | } | |
872 | ||
873 | /* now elide adjacent segments in the load map on MMU linux | |
8a2ab7f5 DH |
874 | * - on uClinux the holes between may actually be filled with system |
875 | * stuff or stuff from other processes | |
1da177e4 LT |
876 | */ |
877 | #ifdef CONFIG_MMU | |
878 | nloads = loadmap->nsegs; | |
879 | mseg = loadmap->segs; | |
880 | seg = mseg + 1; | |
881 | for (loop = 1; loop < nloads; loop++) { | |
882 | /* see if we have a candidate for merging */ | |
883 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { | |
884 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); | |
885 | if (load_addr == (seg->addr & PAGE_MASK)) { | |
8a2ab7f5 DH |
886 | mseg->p_memsz += |
887 | load_addr - | |
888 | (mseg->addr + mseg->p_memsz); | |
1da177e4 LT |
889 | mseg->p_memsz += seg->addr & ~PAGE_MASK; |
890 | mseg->p_memsz += seg->p_memsz; | |
891 | loadmap->nsegs--; | |
892 | continue; | |
893 | } | |
894 | } | |
895 | ||
896 | mseg++; | |
897 | if (mseg != seg) | |
898 | *mseg = *seg; | |
899 | } | |
900 | #endif | |
901 | ||
902 | kdebug("Mapped Object [%s]:", what); | |
903 | kdebug("- elfhdr : %lx", params->elfhdr_addr); | |
904 | kdebug("- entry : %lx", params->entry_addr); | |
905 | kdebug("- PHDR[] : %lx", params->ph_addr); | |
906 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); | |
907 | seg = loadmap->segs; | |
908 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) | |
909 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", | |
910 | loop, | |
911 | seg->addr, seg->addr + seg->p_memsz - 1, | |
912 | seg->p_vaddr, seg->p_memsz); | |
913 | ||
914 | return 0; | |
915 | ||
8a2ab7f5 | 916 | dynamic_error: |
1da177e4 | 917 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
0f7fc9e4 | 918 | what, file->f_path.dentry->d_inode->i_ino); |
1da177e4 | 919 | return -ELIBBAD; |
8a2ab7f5 | 920 | } |
1da177e4 LT |
921 | |
922 | /*****************************************************************************/ | |
923 | /* | |
924 | * map a file with constant displacement under uClinux | |
925 | */ | |
926 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
927 | static int elf_fdpic_map_file_constdisp_on_uclinux( |
928 | struct elf_fdpic_params *params, | |
929 | struct file *file, | |
930 | struct mm_struct *mm) | |
1da177e4 LT |
931 | { |
932 | struct elf32_fdpic_loadseg *seg; | |
933 | struct elf32_phdr *phdr; | |
934 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags; | |
935 | loff_t fpos; | |
936 | int loop, ret; | |
937 | ||
938 | load_addr = params->load_addr; | |
939 | seg = params->loadmap->segs; | |
940 | ||
8a2ab7f5 DH |
941 | /* determine the bounds of the contiguous overall allocation we must |
942 | * make */ | |
1da177e4 LT |
943 | phdr = params->phdrs; |
944 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
945 | if (params->phdrs[loop].p_type != PT_LOAD) | |
946 | continue; | |
947 | ||
948 | if (base > phdr->p_vaddr) | |
949 | base = phdr->p_vaddr; | |
950 | if (top < phdr->p_vaddr + phdr->p_memsz) | |
951 | top = phdr->p_vaddr + phdr->p_memsz; | |
952 | } | |
953 | ||
954 | /* allocate one big anon block for everything */ | |
955 | mflags = MAP_PRIVATE; | |
956 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
957 | mflags |= MAP_EXECUTABLE; | |
958 | ||
959 | down_write(&mm->mmap_sem); | |
960 | maddr = do_mmap(NULL, load_addr, top - base, | |
961 | PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); | |
962 | up_write(&mm->mmap_sem); | |
8a2ab7f5 | 963 | if (IS_ERR_VALUE(maddr)) |
1da177e4 LT |
964 | return (int) maddr; |
965 | ||
966 | if (load_addr != 0) | |
967 | load_addr += PAGE_ALIGN(top - base); | |
968 | ||
969 | /* and then load the file segments into it */ | |
970 | phdr = params->phdrs; | |
971 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
972 | if (params->phdrs[loop].p_type != PT_LOAD) | |
973 | continue; | |
974 | ||
975 | fpos = phdr->p_offset; | |
976 | ||
977 | seg->addr = maddr + (phdr->p_vaddr - base); | |
978 | seg->p_vaddr = phdr->p_vaddr; | |
979 | seg->p_memsz = phdr->p_memsz; | |
980 | ||
8a2ab7f5 DH |
981 | ret = file->f_op->read(file, (void *) seg->addr, |
982 | phdr->p_filesz, &fpos); | |
1da177e4 LT |
983 | if (ret < 0) |
984 | return ret; | |
985 | ||
986 | /* map the ELF header address if in this segment */ | |
987 | if (phdr->p_offset == 0) | |
988 | params->elfhdr_addr = seg->addr; | |
989 | ||
990 | /* clear any space allocated but not loaded */ | |
ab4ad555 MF |
991 | if (phdr->p_filesz < phdr->p_memsz) { |
992 | ret = clear_user((void *) (seg->addr + phdr->p_filesz), | |
993 | phdr->p_memsz - phdr->p_filesz); | |
994 | if (ret) | |
995 | return ret; | |
996 | } | |
1da177e4 LT |
997 | |
998 | if (mm) { | |
999 | if (phdr->p_flags & PF_X) { | |
aa289b47 DH |
1000 | if (!mm->start_code) { |
1001 | mm->start_code = seg->addr; | |
1002 | mm->end_code = seg->addr + | |
1003 | phdr->p_memsz; | |
1004 | } | |
8a2ab7f5 | 1005 | } else if (!mm->start_data) { |
1da177e4 LT |
1006 | mm->start_data = seg->addr; |
1007 | #ifndef CONFIG_MMU | |
1008 | mm->end_data = seg->addr + phdr->p_memsz; | |
1009 | #endif | |
1010 | } | |
1011 | ||
1012 | #ifdef CONFIG_MMU | |
1013 | if (seg->addr + phdr->p_memsz > mm->end_data) | |
1014 | mm->end_data = seg->addr + phdr->p_memsz; | |
1015 | #endif | |
1016 | } | |
1017 | ||
1018 | seg++; | |
1019 | } | |
1020 | ||
1021 | return 0; | |
8a2ab7f5 | 1022 | } |
1da177e4 LT |
1023 | #endif |
1024 | ||
1025 | /*****************************************************************************/ | |
1026 | /* | |
1027 | * map a binary by direct mmap() of the individual PT_LOAD segments | |
1028 | */ | |
1029 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, | |
1030 | struct file *file, | |
1031 | struct mm_struct *mm) | |
1032 | { | |
1033 | struct elf32_fdpic_loadseg *seg; | |
1034 | struct elf32_phdr *phdr; | |
1035 | unsigned long load_addr, delta_vaddr; | |
ab4ad555 | 1036 | int loop, dvset, ret; |
1da177e4 LT |
1037 | |
1038 | load_addr = params->load_addr; | |
1039 | delta_vaddr = 0; | |
1040 | dvset = 0; | |
1041 | ||
1042 | seg = params->loadmap->segs; | |
1043 | ||
1044 | /* deal with each load segment separately */ | |
1045 | phdr = params->phdrs; | |
1046 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
1047 | unsigned long maddr, disp, excess, excess1; | |
1048 | int prot = 0, flags; | |
1049 | ||
1050 | if (phdr->p_type != PT_LOAD) | |
1051 | continue; | |
1052 | ||
1053 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", | |
1054 | (unsigned long) phdr->p_vaddr, | |
1055 | (unsigned long) phdr->p_offset, | |
1056 | (unsigned long) phdr->p_filesz, | |
1057 | (unsigned long) phdr->p_memsz); | |
1058 | ||
1059 | /* determine the mapping parameters */ | |
1060 | if (phdr->p_flags & PF_R) prot |= PROT_READ; | |
1061 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; | |
1062 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; | |
1063 | ||
1064 | flags = MAP_PRIVATE | MAP_DENYWRITE; | |
1065 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
1066 | flags |= MAP_EXECUTABLE; | |
1067 | ||
1068 | maddr = 0; | |
1069 | ||
1070 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
1071 | case ELF_FDPIC_FLAG_INDEPENDENT: | |
1072 | /* PT_LOADs are independently locatable */ | |
1073 | break; | |
1074 | ||
1075 | case ELF_FDPIC_FLAG_HONOURVADDR: | |
1076 | /* the specified virtual address must be honoured */ | |
1077 | maddr = phdr->p_vaddr; | |
1078 | flags |= MAP_FIXED; | |
1079 | break; | |
1080 | ||
1081 | case ELF_FDPIC_FLAG_CONSTDISP: | |
1082 | /* constant displacement | |
8a2ab7f5 DH |
1083 | * - can be mapped anywhere, but must be mapped as a |
1084 | * unit | |
1da177e4 LT |
1085 | */ |
1086 | if (!dvset) { | |
1087 | maddr = load_addr; | |
1088 | delta_vaddr = phdr->p_vaddr; | |
1089 | dvset = 1; | |
8a2ab7f5 | 1090 | } else { |
1da177e4 LT |
1091 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
1092 | flags |= MAP_FIXED; | |
1093 | } | |
1094 | break; | |
1095 | ||
1096 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
1097 | /* contiguity handled later */ | |
1098 | break; | |
1099 | ||
1100 | default: | |
1101 | BUG(); | |
1102 | } | |
1103 | ||
1104 | maddr &= PAGE_MASK; | |
1105 | ||
1106 | /* create the mapping */ | |
1107 | disp = phdr->p_vaddr & ~PAGE_MASK; | |
1108 | down_write(&mm->mmap_sem); | |
1109 | maddr = do_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, | |
1110 | phdr->p_offset - disp); | |
1111 | up_write(&mm->mmap_sem); | |
1112 | ||
1113 | kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", | |
8a2ab7f5 DH |
1114 | loop, phdr->p_memsz + disp, prot, flags, |
1115 | phdr->p_offset - disp, maddr); | |
1da177e4 | 1116 | |
8a2ab7f5 | 1117 | if (IS_ERR_VALUE(maddr)) |
1da177e4 LT |
1118 | return (int) maddr; |
1119 | ||
8a2ab7f5 DH |
1120 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
1121 | ELF_FDPIC_FLAG_CONTIGUOUS) | |
1da177e4 LT |
1122 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
1123 | ||
1124 | seg->addr = maddr + disp; | |
1125 | seg->p_vaddr = phdr->p_vaddr; | |
1126 | seg->p_memsz = phdr->p_memsz; | |
1127 | ||
1128 | /* map the ELF header address if in this segment */ | |
1129 | if (phdr->p_offset == 0) | |
1130 | params->elfhdr_addr = seg->addr; | |
1131 | ||
8a2ab7f5 DH |
1132 | /* clear the bit between beginning of mapping and beginning of |
1133 | * PT_LOAD */ | |
1da177e4 LT |
1134 | if (prot & PROT_WRITE && disp > 0) { |
1135 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); | |
ab4ad555 MF |
1136 | ret = clear_user((void __user *) maddr, disp); |
1137 | if (ret) | |
1138 | return ret; | |
1da177e4 LT |
1139 | maddr += disp; |
1140 | } | |
1141 | ||
1142 | /* clear any space allocated but not loaded | |
1143 | * - on uClinux we can just clear the lot | |
1144 | * - on MMU linux we'll get a SIGBUS beyond the last page | |
1145 | * extant in the file | |
1146 | */ | |
1147 | excess = phdr->p_memsz - phdr->p_filesz; | |
1148 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); | |
1149 | ||
1150 | #ifdef CONFIG_MMU | |
1da177e4 LT |
1151 | if (excess > excess1) { |
1152 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; | |
1153 | unsigned long xmaddr; | |
1154 | ||
1155 | flags |= MAP_FIXED | MAP_ANONYMOUS; | |
1156 | down_write(&mm->mmap_sem); | |
8a2ab7f5 DH |
1157 | xmaddr = do_mmap(NULL, xaddr, excess - excess1, |
1158 | prot, flags, 0); | |
1da177e4 LT |
1159 | up_write(&mm->mmap_sem); |
1160 | ||
1161 | kdebug("mmap[%d] <anon>" | |
1162 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", | |
8a2ab7f5 DH |
1163 | loop, xaddr, excess - excess1, prot, flags, |
1164 | xmaddr); | |
1da177e4 LT |
1165 | |
1166 | if (xmaddr != xaddr) | |
1167 | return -ENOMEM; | |
1168 | } | |
1169 | ||
1170 | if (prot & PROT_WRITE && excess1 > 0) { | |
1171 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1172 | loop, maddr + phdr->p_filesz, excess1); | |
ab4ad555 MF |
1173 | ret = clear_user((void __user *) maddr + phdr->p_filesz, |
1174 | excess1); | |
1175 | if (ret) | |
1176 | return ret; | |
1da177e4 LT |
1177 | } |
1178 | ||
1179 | #else | |
1180 | if (excess > 0) { | |
1181 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1182 | loop, maddr + phdr->p_filesz, excess); | |
ab4ad555 MF |
1183 | ret = clear_user((void *) maddr + phdr->p_filesz, excess); |
1184 | if (ret) | |
1185 | return ret; | |
1da177e4 LT |
1186 | } |
1187 | #endif | |
1188 | ||
1189 | if (mm) { | |
1190 | if (phdr->p_flags & PF_X) { | |
aa289b47 DH |
1191 | if (!mm->start_code) { |
1192 | mm->start_code = maddr; | |
1193 | mm->end_code = maddr + phdr->p_memsz; | |
1194 | } | |
8a2ab7f5 | 1195 | } else if (!mm->start_data) { |
1da177e4 LT |
1196 | mm->start_data = maddr; |
1197 | mm->end_data = maddr + phdr->p_memsz; | |
1198 | } | |
1199 | } | |
1200 | ||
1201 | seg++; | |
1202 | } | |
1203 | ||
1204 | return 0; | |
8a2ab7f5 | 1205 | } |
6d8c4e3b DH |
1206 | |
1207 | /*****************************************************************************/ | |
1208 | /* | |
1209 | * ELF-FDPIC core dumper | |
1210 | * | |
1211 | * Modelled on fs/exec.c:aout_core_dump() | |
1212 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1213 | * | |
1214 | * Modelled on fs/binfmt_elf.c core dumper | |
1215 | */ | |
698ba7b5 | 1216 | #ifdef CONFIG_ELF_CORE |
6d8c4e3b DH |
1217 | |
1218 | /* | |
1219 | * These are the only things you should do on a core-file: use only these | |
1220 | * functions to write out all the necessary info. | |
1221 | */ | |
1222 | static int dump_write(struct file *file, const void *addr, int nr) | |
1223 | { | |
1224 | return file->f_op->write(file, addr, nr, &file->f_pos) == nr; | |
1225 | } | |
1226 | ||
1227 | static int dump_seek(struct file *file, loff_t off) | |
1228 | { | |
1229 | if (file->f_op->llseek) { | |
1230 | if (file->f_op->llseek(file, off, SEEK_SET) != off) | |
1231 | return 0; | |
1232 | } else { | |
1233 | file->f_pos = off; | |
1234 | } | |
1235 | return 1; | |
1236 | } | |
1237 | ||
1238 | /* | |
1239 | * Decide whether a segment is worth dumping; default is yes to be | |
1240 | * sure (missing info is worse than too much; etc). | |
1241 | * Personally I'd include everything, and use the coredump limit... | |
1242 | * | |
1243 | * I think we should skip something. But I am not sure how. H.J. | |
1244 | */ | |
ee78b0a6 | 1245 | static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) |
6d8c4e3b | 1246 | { |
ee78b0a6 KH |
1247 | int dump_ok; |
1248 | ||
6d8c4e3b DH |
1249 | /* Do not dump I/O mapped devices or special mappings */ |
1250 | if (vma->vm_flags & (VM_IO | VM_RESERVED)) { | |
1251 | kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags); | |
1252 | return 0; | |
1253 | } | |
1254 | ||
1255 | /* If we may not read the contents, don't allow us to dump | |
1256 | * them either. "dump_write()" can't handle it anyway. | |
1257 | */ | |
1258 | if (!(vma->vm_flags & VM_READ)) { | |
1259 | kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags); | |
1260 | return 0; | |
1261 | } | |
1262 | ||
ee78b0a6 | 1263 | /* By default, dump shared memory if mapped from an anonymous file. */ |
6d8c4e3b | 1264 | if (vma->vm_flags & VM_SHARED) { |
0f7fc9e4 | 1265 | if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0) { |
ee78b0a6 KH |
1266 | dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags); |
1267 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, | |
1268 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1269 | return dump_ok; | |
6d8c4e3b DH |
1270 | } |
1271 | ||
ee78b0a6 KH |
1272 | dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags); |
1273 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, | |
1274 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1275 | return dump_ok; | |
6d8c4e3b DH |
1276 | } |
1277 | ||
1278 | #ifdef CONFIG_MMU | |
ee78b0a6 | 1279 | /* By default, if it hasn't been written to, don't write it out */ |
6d8c4e3b | 1280 | if (!vma->anon_vma) { |
ee78b0a6 KH |
1281 | dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags); |
1282 | kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start, | |
1283 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1284 | return dump_ok; | |
6d8c4e3b DH |
1285 | } |
1286 | #endif | |
1287 | ||
ee78b0a6 KH |
1288 | dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags); |
1289 | kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags, | |
1290 | dump_ok ? "yes" : "no"); | |
1291 | return dump_ok; | |
6d8c4e3b DH |
1292 | } |
1293 | ||
1294 | /* An ELF note in memory */ | |
1295 | struct memelfnote | |
1296 | { | |
1297 | const char *name; | |
1298 | int type; | |
1299 | unsigned int datasz; | |
1300 | void *data; | |
1301 | }; | |
1302 | ||
1303 | static int notesize(struct memelfnote *en) | |
1304 | { | |
1305 | int sz; | |
1306 | ||
1307 | sz = sizeof(struct elf_note); | |
1308 | sz += roundup(strlen(en->name) + 1, 4); | |
1309 | sz += roundup(en->datasz, 4); | |
1310 | ||
1311 | return sz; | |
1312 | } | |
1313 | ||
1314 | /* #define DEBUG */ | |
1315 | ||
1316 | #define DUMP_WRITE(addr, nr) \ | |
1317 | do { if (!dump_write(file, (addr), (nr))) return 0; } while(0) | |
1318 | #define DUMP_SEEK(off) \ | |
1319 | do { if (!dump_seek(file, (off))) return 0; } while(0) | |
1320 | ||
1321 | static int writenote(struct memelfnote *men, struct file *file) | |
1322 | { | |
1323 | struct elf_note en; | |
1324 | ||
1325 | en.n_namesz = strlen(men->name) + 1; | |
1326 | en.n_descsz = men->datasz; | |
1327 | en.n_type = men->type; | |
1328 | ||
1329 | DUMP_WRITE(&en, sizeof(en)); | |
1330 | DUMP_WRITE(men->name, en.n_namesz); | |
1331 | /* XXX - cast from long long to long to avoid need for libgcc.a */ | |
1332 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ | |
1333 | DUMP_WRITE(men->data, men->datasz); | |
1334 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ | |
1335 | ||
1336 | return 1; | |
1337 | } | |
1338 | #undef DUMP_WRITE | |
1339 | #undef DUMP_SEEK | |
1340 | ||
f6151dfe MH |
1341 | #define DUMP_WRITE(addr, nr) \ |
1342 | if ((size += (nr)) > cprm->limit || \ | |
1343 | !dump_write(cprm->file, (addr), (nr))) \ | |
6d8c4e3b | 1344 | goto end_coredump; |
6d8c4e3b DH |
1345 | |
1346 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) | |
1347 | { | |
1348 | memcpy(elf->e_ident, ELFMAG, SELFMAG); | |
1349 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1350 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1351 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1352 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1353 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); | |
1354 | ||
1355 | elf->e_type = ET_CORE; | |
1356 | elf->e_machine = ELF_ARCH; | |
1357 | elf->e_version = EV_CURRENT; | |
1358 | elf->e_entry = 0; | |
1359 | elf->e_phoff = sizeof(struct elfhdr); | |
1360 | elf->e_shoff = 0; | |
1361 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS; | |
1362 | elf->e_ehsize = sizeof(struct elfhdr); | |
1363 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1364 | elf->e_phnum = segs; | |
1365 | elf->e_shentsize = 0; | |
1366 | elf->e_shnum = 0; | |
1367 | elf->e_shstrndx = 0; | |
1368 | return; | |
1369 | } | |
1370 | ||
1371 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) | |
1372 | { | |
1373 | phdr->p_type = PT_NOTE; | |
1374 | phdr->p_offset = offset; | |
1375 | phdr->p_vaddr = 0; | |
1376 | phdr->p_paddr = 0; | |
1377 | phdr->p_filesz = sz; | |
1378 | phdr->p_memsz = 0; | |
1379 | phdr->p_flags = 0; | |
1380 | phdr->p_align = 0; | |
1381 | return; | |
1382 | } | |
1383 | ||
1384 | static inline void fill_note(struct memelfnote *note, const char *name, int type, | |
1385 | unsigned int sz, void *data) | |
1386 | { | |
1387 | note->name = name; | |
1388 | note->type = type; | |
1389 | note->datasz = sz; | |
1390 | note->data = data; | |
1391 | return; | |
1392 | } | |
1393 | ||
1394 | /* | |
1395 | * fill up all the fields in prstatus from the given task struct, except | |
1396 | * registers which need to be filled up seperately. | |
1397 | */ | |
1398 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
1399 | struct task_struct *p, long signr) | |
1400 | { | |
1401 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1402 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1403 | prstatus->pr_sighold = p->blocked.sig[0]; | |
3b34fc58 ON |
1404 | rcu_read_lock(); |
1405 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1406 | rcu_read_unlock(); | |
b488893a | 1407 | prstatus->pr_pid = task_pid_vnr(p); |
b488893a PE |
1408 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1409 | prstatus->pr_sid = task_session_vnr(p); | |
6d8c4e3b | 1410 | if (thread_group_leader(p)) { |
2515ddc6 PM |
1411 | struct task_cputime cputime; |
1412 | ||
6d8c4e3b | 1413 | /* |
2515ddc6 PM |
1414 | * This is the record for the group leader. It shows the |
1415 | * group-wide total, not its individual thread total. | |
6d8c4e3b | 1416 | */ |
2515ddc6 PM |
1417 | thread_group_cputime(p, &cputime); |
1418 | cputime_to_timeval(cputime.utime, &prstatus->pr_utime); | |
1419 | cputime_to_timeval(cputime.stime, &prstatus->pr_stime); | |
6d8c4e3b DH |
1420 | } else { |
1421 | cputime_to_timeval(p->utime, &prstatus->pr_utime); | |
1422 | cputime_to_timeval(p->stime, &prstatus->pr_stime); | |
1423 | } | |
1424 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); | |
1425 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); | |
1426 | ||
1427 | prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; | |
1428 | prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; | |
1429 | } | |
1430 | ||
1431 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1432 | struct mm_struct *mm) | |
1433 | { | |
c69e8d9c | 1434 | const struct cred *cred; |
6d8c4e3b DH |
1435 | unsigned int i, len; |
1436 | ||
1437 | /* first copy the parameters from user space */ | |
1438 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1439 | ||
1440 | len = mm->arg_end - mm->arg_start; | |
1441 | if (len >= ELF_PRARGSZ) | |
1442 | len = ELF_PRARGSZ - 1; | |
1443 | if (copy_from_user(&psinfo->pr_psargs, | |
1444 | (const char __user *) mm->arg_start, len)) | |
1445 | return -EFAULT; | |
1446 | for (i = 0; i < len; i++) | |
1447 | if (psinfo->pr_psargs[i] == 0) | |
1448 | psinfo->pr_psargs[i] = ' '; | |
1449 | psinfo->pr_psargs[len] = 0; | |
1450 | ||
3b34fc58 ON |
1451 | rcu_read_lock(); |
1452 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1453 | rcu_read_unlock(); | |
b488893a | 1454 | psinfo->pr_pid = task_pid_vnr(p); |
b488893a PE |
1455 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1456 | psinfo->pr_sid = task_session_vnr(p); | |
6d8c4e3b DH |
1457 | |
1458 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1459 | psinfo->pr_state = i; | |
1460 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; | |
1461 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; | |
1462 | psinfo->pr_nice = task_nice(p); | |
1463 | psinfo->pr_flag = p->flags; | |
c69e8d9c DH |
1464 | rcu_read_lock(); |
1465 | cred = __task_cred(p); | |
1466 | SET_UID(psinfo->pr_uid, cred->uid); | |
1467 | SET_GID(psinfo->pr_gid, cred->gid); | |
1468 | rcu_read_unlock(); | |
6d8c4e3b DH |
1469 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1470 | ||
1471 | return 0; | |
1472 | } | |
1473 | ||
1474 | /* Here is the structure in which status of each thread is captured. */ | |
1475 | struct elf_thread_status | |
1476 | { | |
1477 | struct list_head list; | |
1478 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1479 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1480 | struct task_struct *thread; | |
1481 | #ifdef ELF_CORE_COPY_XFPREGS | |
5b20cd80 | 1482 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
6d8c4e3b DH |
1483 | #endif |
1484 | struct memelfnote notes[3]; | |
1485 | int num_notes; | |
1486 | }; | |
1487 | ||
1488 | /* | |
1489 | * In order to add the specific thread information for the elf file format, | |
1490 | * we need to keep a linked list of every thread's pr_status and then create | |
1491 | * a single section for them in the final core file. | |
1492 | */ | |
1493 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1494 | { | |
1495 | struct task_struct *p = t->thread; | |
1496 | int sz = 0; | |
1497 | ||
1498 | t->num_notes = 0; | |
1499 | ||
1500 | fill_prstatus(&t->prstatus, p, signr); | |
1501 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1502 | ||
1503 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), | |
1504 | &t->prstatus); | |
1505 | t->num_notes++; | |
1506 | sz += notesize(&t->notes[0]); | |
1507 | ||
1508 | t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu); | |
1509 | if (t->prstatus.pr_fpvalid) { | |
1510 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1511 | &t->fpu); | |
1512 | t->num_notes++; | |
1513 | sz += notesize(&t->notes[1]); | |
1514 | } | |
1515 | ||
1516 | #ifdef ELF_CORE_COPY_XFPREGS | |
1517 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
5b20cd80 MN |
1518 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1519 | sizeof(t->xfpu), &t->xfpu); | |
6d8c4e3b DH |
1520 | t->num_notes++; |
1521 | sz += notesize(&t->notes[2]); | |
1522 | } | |
1523 | #endif | |
1524 | return sz; | |
1525 | } | |
1526 | ||
1527 | /* | |
1528 | * dump the segments for an MMU process | |
1529 | */ | |
1530 | #ifdef CONFIG_MMU | |
e2e00906 | 1531 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
ee78b0a6 | 1532 | unsigned long *limit, unsigned long mm_flags) |
6d8c4e3b DH |
1533 | { |
1534 | struct vm_area_struct *vma; | |
f3e8fccd | 1535 | int err = 0; |
6d8c4e3b DH |
1536 | |
1537 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { | |
1538 | unsigned long addr; | |
1539 | ||
ee78b0a6 | 1540 | if (!maydump(vma, mm_flags)) |
6d8c4e3b DH |
1541 | continue; |
1542 | ||
f3e8fccd HD |
1543 | for (addr = vma->vm_start; addr < vma->vm_end; |
1544 | addr += PAGE_SIZE) { | |
1545 | struct page *page = get_dump_page(addr); | |
1546 | if (page) { | |
1547 | void *kaddr = kmap(page); | |
1548 | *size += PAGE_SIZE; | |
1549 | if (*size > *limit) | |
1550 | err = -EFBIG; | |
1551 | else if (!dump_write(file, kaddr, PAGE_SIZE)) | |
1552 | err = -EIO; | |
6d8c4e3b DH |
1553 | kunmap(page); |
1554 | page_cache_release(page); | |
f3e8fccd HD |
1555 | } else if (!dump_seek(file, file->f_pos + PAGE_SIZE)) |
1556 | err = -EFBIG; | |
1557 | if (err) | |
1558 | goto out; | |
6d8c4e3b DH |
1559 | } |
1560 | } | |
f3e8fccd HD |
1561 | out: |
1562 | return err; | |
6d8c4e3b DH |
1563 | } |
1564 | #endif | |
1565 | ||
1566 | /* | |
1567 | * dump the segments for a NOMMU process | |
1568 | */ | |
1569 | #ifndef CONFIG_MMU | |
e2e00906 | 1570 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
ee78b0a6 | 1571 | unsigned long *limit, unsigned long mm_flags) |
6d8c4e3b | 1572 | { |
8feae131 | 1573 | struct vm_area_struct *vma; |
6d8c4e3b | 1574 | |
8feae131 | 1575 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
ee78b0a6 | 1576 | if (!maydump(vma, mm_flags)) |
6d8c4e3b DH |
1577 | continue; |
1578 | ||
1579 | if ((*size += PAGE_SIZE) > *limit) | |
1580 | return -EFBIG; | |
1581 | ||
1582 | if (!dump_write(file, (void *) vma->vm_start, | |
1583 | vma->vm_end - vma->vm_start)) | |
1584 | return -EIO; | |
1585 | } | |
1586 | ||
1587 | return 0; | |
1588 | } | |
1589 | #endif | |
1590 | ||
1591 | /* | |
1592 | * Actual dumper | |
1593 | * | |
1594 | * This is a two-pass process; first we find the offsets of the bits, | |
1595 | * and then they are actually written out. If we run out of core limit | |
1596 | * we just truncate. | |
1597 | */ | |
f6151dfe | 1598 | static int elf_fdpic_core_dump(struct coredump_params *cprm) |
6d8c4e3b DH |
1599 | { |
1600 | #define NUM_NOTES 6 | |
1601 | int has_dumped = 0; | |
1602 | mm_segment_t fs; | |
1603 | int segs; | |
1604 | size_t size = 0; | |
1605 | int i; | |
1606 | struct vm_area_struct *vma; | |
1607 | struct elfhdr *elf = NULL; | |
1608 | loff_t offset = 0, dataoff; | |
6d8c4e3b DH |
1609 | int numnote; |
1610 | struct memelfnote *notes = NULL; | |
1611 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ | |
1612 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ | |
6d8c4e3b DH |
1613 | LIST_HEAD(thread_list); |
1614 | struct list_head *t; | |
1615 | elf_fpregset_t *fpu = NULL; | |
1616 | #ifdef ELF_CORE_COPY_XFPREGS | |
1617 | elf_fpxregset_t *xfpu = NULL; | |
1618 | #endif | |
1619 | int thread_status_size = 0; | |
6d8c4e3b | 1620 | elf_addr_t *auxv; |
ee78b0a6 | 1621 | unsigned long mm_flags; |
6d8c4e3b DH |
1622 | |
1623 | /* | |
1624 | * We no longer stop all VM operations. | |
1625 | * | |
1626 | * This is because those proceses that could possibly change map_count | |
1627 | * or the mmap / vma pages are now blocked in do_exit on current | |
1628 | * finishing this core dump. | |
1629 | * | |
1630 | * Only ptrace can touch these memory addresses, but it doesn't change | |
1631 | * the map_count or the pages allocated. So no possibility of crashing | |
1632 | * exists while dumping the mm->vm_next areas to the core file. | |
1633 | */ | |
1634 | ||
1635 | /* alloc memory for large data structures: too large to be on stack */ | |
1636 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
1637 | if (!elf) | |
1638 | goto cleanup; | |
1639 | prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL); | |
1640 | if (!prstatus) | |
1641 | goto cleanup; | |
1642 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
1643 | if (!psinfo) | |
1644 | goto cleanup; | |
1645 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); | |
1646 | if (!notes) | |
1647 | goto cleanup; | |
1648 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); | |
1649 | if (!fpu) | |
1650 | goto cleanup; | |
1651 | #ifdef ELF_CORE_COPY_XFPREGS | |
1652 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); | |
1653 | if (!xfpu) | |
1654 | goto cleanup; | |
1655 | #endif | |
1656 | ||
f6151dfe | 1657 | if (cprm->signr) { |
182c515f | 1658 | struct core_thread *ct; |
6d8c4e3b | 1659 | struct elf_thread_status *tmp; |
182c515f ON |
1660 | |
1661 | for (ct = current->mm->core_state->dumper.next; | |
1662 | ct; ct = ct->next) { | |
1663 | tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); | |
1664 | if (!tmp) | |
1665 | goto cleanup; | |
1666 | ||
1667 | tmp->thread = ct->task; | |
1668 | list_add(&tmp->list, &thread_list); | |
1669 | } | |
1670 | ||
6d8c4e3b DH |
1671 | list_for_each(t, &thread_list) { |
1672 | struct elf_thread_status *tmp; | |
1673 | int sz; | |
1674 | ||
1675 | tmp = list_entry(t, struct elf_thread_status, list); | |
f6151dfe | 1676 | sz = elf_dump_thread_status(cprm->signr, tmp); |
6d8c4e3b DH |
1677 | thread_status_size += sz; |
1678 | } | |
1679 | } | |
1680 | ||
1681 | /* now collect the dump for the current */ | |
f6151dfe MH |
1682 | fill_prstatus(prstatus, current, cprm->signr); |
1683 | elf_core_copy_regs(&prstatus->pr_reg, cprm->regs); | |
6d8c4e3b | 1684 | |
6d8c4e3b | 1685 | segs = current->mm->map_count; |
6d8c4e3b DH |
1686 | #ifdef ELF_CORE_EXTRA_PHDRS |
1687 | segs += ELF_CORE_EXTRA_PHDRS; | |
1688 | #endif | |
1689 | ||
1690 | /* Set up header */ | |
1691 | fill_elf_fdpic_header(elf, segs + 1); /* including notes section */ | |
1692 | ||
1693 | has_dumped = 1; | |
1694 | current->flags |= PF_DUMPCORE; | |
1695 | ||
1696 | /* | |
1697 | * Set up the notes in similar form to SVR4 core dumps made | |
1698 | * with info from their /proc. | |
1699 | */ | |
1700 | ||
1701 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); | |
1702 | fill_psinfo(psinfo, current->group_leader, current->mm); | |
1703 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); | |
1704 | ||
1705 | numnote = 2; | |
1706 | ||
1707 | auxv = (elf_addr_t *) current->mm->saved_auxv; | |
1708 | ||
1709 | i = 0; | |
1710 | do | |
1711 | i += 2; | |
1712 | while (auxv[i - 2] != AT_NULL); | |
1713 | fill_note(¬es[numnote++], "CORE", NT_AUXV, | |
1714 | i * sizeof(elf_addr_t), auxv); | |
1715 | ||
1716 | /* Try to dump the FPU. */ | |
1717 | if ((prstatus->pr_fpvalid = | |
f6151dfe | 1718 | elf_core_copy_task_fpregs(current, cprm->regs, fpu))) |
6d8c4e3b DH |
1719 | fill_note(notes + numnote++, |
1720 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); | |
1721 | #ifdef ELF_CORE_COPY_XFPREGS | |
1722 | if (elf_core_copy_task_xfpregs(current, xfpu)) | |
1723 | fill_note(notes + numnote++, | |
5b20cd80 | 1724 | "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu); |
6d8c4e3b DH |
1725 | #endif |
1726 | ||
1727 | fs = get_fs(); | |
1728 | set_fs(KERNEL_DS); | |
1729 | ||
1730 | DUMP_WRITE(elf, sizeof(*elf)); | |
1731 | offset += sizeof(*elf); /* Elf header */ | |
1732 | offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */ | |
1733 | ||
1734 | /* Write notes phdr entry */ | |
1735 | { | |
1736 | struct elf_phdr phdr; | |
1737 | int sz = 0; | |
1738 | ||
1739 | for (i = 0; i < numnote; i++) | |
1740 | sz += notesize(notes + i); | |
1741 | ||
1742 | sz += thread_status_size; | |
1743 | ||
1744 | fill_elf_note_phdr(&phdr, sz, offset); | |
1745 | offset += sz; | |
1746 | DUMP_WRITE(&phdr, sizeof(phdr)); | |
1747 | } | |
1748 | ||
1749 | /* Page-align dumped data */ | |
1750 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); | |
1751 | ||
ee78b0a6 KH |
1752 | /* |
1753 | * We must use the same mm->flags while dumping core to avoid | |
1754 | * inconsistency between the program headers and bodies, otherwise an | |
1755 | * unusable core file can be generated. | |
1756 | */ | |
1757 | mm_flags = current->mm->flags; | |
1758 | ||
6d8c4e3b | 1759 | /* write program headers for segments dump */ |
8feae131 | 1760 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
6d8c4e3b DH |
1761 | struct elf_phdr phdr; |
1762 | size_t sz; | |
1763 | ||
6d8c4e3b DH |
1764 | sz = vma->vm_end - vma->vm_start; |
1765 | ||
1766 | phdr.p_type = PT_LOAD; | |
1767 | phdr.p_offset = offset; | |
1768 | phdr.p_vaddr = vma->vm_start; | |
1769 | phdr.p_paddr = 0; | |
ee78b0a6 | 1770 | phdr.p_filesz = maydump(vma, mm_flags) ? sz : 0; |
6d8c4e3b DH |
1771 | phdr.p_memsz = sz; |
1772 | offset += phdr.p_filesz; | |
1773 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
1774 | if (vma->vm_flags & VM_WRITE) | |
1775 | phdr.p_flags |= PF_W; | |
1776 | if (vma->vm_flags & VM_EXEC) | |
1777 | phdr.p_flags |= PF_X; | |
1778 | phdr.p_align = ELF_EXEC_PAGESIZE; | |
1779 | ||
1780 | DUMP_WRITE(&phdr, sizeof(phdr)); | |
1781 | } | |
1782 | ||
1783 | #ifdef ELF_CORE_WRITE_EXTRA_PHDRS | |
1784 | ELF_CORE_WRITE_EXTRA_PHDRS; | |
1785 | #endif | |
1786 | ||
1787 | /* write out the notes section */ | |
1788 | for (i = 0; i < numnote; i++) | |
f6151dfe | 1789 | if (!writenote(notes + i, cprm->file)) |
6d8c4e3b DH |
1790 | goto end_coredump; |
1791 | ||
1792 | /* write out the thread status notes section */ | |
1793 | list_for_each(t, &thread_list) { | |
1794 | struct elf_thread_status *tmp = | |
1795 | list_entry(t, struct elf_thread_status, list); | |
1796 | ||
1797 | for (i = 0; i < tmp->num_notes; i++) | |
f6151dfe | 1798 | if (!writenote(&tmp->notes[i], cprm->file)) |
6d8c4e3b DH |
1799 | goto end_coredump; |
1800 | } | |
1801 | ||
f6151dfe | 1802 | if (!dump_seek(cprm->file, dataoff)) |
f3e8fccd | 1803 | goto end_coredump; |
6d8c4e3b | 1804 | |
f6151dfe MH |
1805 | if (elf_fdpic_dump_segments(cprm->file, &size, &cprm->limit, |
1806 | mm_flags) < 0) | |
6d8c4e3b DH |
1807 | goto end_coredump; |
1808 | ||
1809 | #ifdef ELF_CORE_WRITE_EXTRA_DATA | |
1810 | ELF_CORE_WRITE_EXTRA_DATA; | |
1811 | #endif | |
1812 | ||
2f48912d | 1813 | if (cprm->file->f_pos != offset) { |
6d8c4e3b DH |
1814 | /* Sanity check */ |
1815 | printk(KERN_WARNING | |
1816 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", | |
2f48912d | 1817 | cprm->file->f_pos, offset); |
6d8c4e3b DH |
1818 | } |
1819 | ||
1820 | end_coredump: | |
1821 | set_fs(fs); | |
1822 | ||
1823 | cleanup: | |
1824 | while (!list_empty(&thread_list)) { | |
1825 | struct list_head *tmp = thread_list.next; | |
1826 | list_del(tmp); | |
1827 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
1828 | } | |
1829 | ||
1830 | kfree(elf); | |
1831 | kfree(prstatus); | |
1832 | kfree(psinfo); | |
1833 | kfree(notes); | |
1834 | kfree(fpu); | |
1835 | #ifdef ELF_CORE_COPY_XFPREGS | |
1836 | kfree(xfpu); | |
1837 | #endif | |
1838 | return has_dumped; | |
1839 | #undef NUM_NOTES | |
1840 | } | |
1841 | ||
698ba7b5 | 1842 | #endif /* CONFIG_ELF_CORE */ |