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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> |
1da177e4 | 28 | #include <linux/highmem.h> |
6d8c4e3b | 29 | #include <linux/highuid.h> |
1da177e4 LT |
30 | #include <linux/personality.h> |
31 | #include <linux/ptrace.h> | |
32 | #include <linux/init.h> | |
1da177e4 LT |
33 | #include <linux/elf.h> |
34 | #include <linux/elf-fdpic.h> | |
35 | #include <linux/elfcore.h> | |
36 | ||
37 | #include <asm/uaccess.h> | |
38 | #include <asm/param.h> | |
39 | #include <asm/pgalloc.h> | |
40 | ||
41 | typedef char *elf_caddr_t; | |
1da177e4 LT |
42 | |
43 | #if 0 | |
44 | #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) | |
45 | #else | |
46 | #define kdebug(fmt, ...) do {} while(0) | |
47 | #endif | |
48 | ||
6d8c4e3b DH |
49 | #if 0 |
50 | #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) | |
51 | #else | |
52 | #define kdcore(fmt, ...) do {} while(0) | |
53 | #endif | |
54 | ||
1da177e4 LT |
55 | MODULE_LICENSE("GPL"); |
56 | ||
8a2ab7f5 DH |
57 | static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *); |
58 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); | |
59 | static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, | |
60 | struct mm_struct *, const char *); | |
1da177e4 | 61 | |
8a2ab7f5 DH |
62 | static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, |
63 | struct elf_fdpic_params *, | |
64 | struct elf_fdpic_params *); | |
1da177e4 LT |
65 | |
66 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
67 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *, |
68 | unsigned long *); | |
69 | static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *, | |
70 | struct file *, | |
71 | struct mm_struct *); | |
1da177e4 LT |
72 | #endif |
73 | ||
8a2ab7f5 DH |
74 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, |
75 | struct file *, struct mm_struct *); | |
1da177e4 | 76 | |
6d8c4e3b | 77 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
7dc0b22e | 78 | static int elf_fdpic_core_dump(long, struct pt_regs *, struct file *, unsigned long limit); |
6d8c4e3b DH |
79 | #endif |
80 | ||
1da177e4 LT |
81 | static struct linux_binfmt elf_fdpic_format = { |
82 | .module = THIS_MODULE, | |
83 | .load_binary = load_elf_fdpic_binary, | |
6d8c4e3b DH |
84 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
85 | .core_dump = elf_fdpic_core_dump, | |
86 | #endif | |
1da177e4 LT |
87 | .min_coredump = ELF_EXEC_PAGESIZE, |
88 | }; | |
89 | ||
8a2ab7f5 DH |
90 | static int __init init_elf_fdpic_binfmt(void) |
91 | { | |
92 | return register_binfmt(&elf_fdpic_format); | |
93 | } | |
1da177e4 | 94 | |
8a2ab7f5 DH |
95 | static void __exit exit_elf_fdpic_binfmt(void) |
96 | { | |
97 | unregister_binfmt(&elf_fdpic_format); | |
98 | } | |
99 | ||
6d8c4e3b | 100 | core_initcall(init_elf_fdpic_binfmt); |
8a2ab7f5 | 101 | module_exit(exit_elf_fdpic_binfmt); |
1da177e4 LT |
102 | |
103 | static int is_elf_fdpic(struct elfhdr *hdr, struct file *file) | |
104 | { | |
105 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) | |
106 | return 0; | |
107 | if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) | |
108 | return 0; | |
109 | if (!elf_check_arch(hdr) || !elf_check_fdpic(hdr)) | |
110 | return 0; | |
111 | if (!file->f_op || !file->f_op->mmap) | |
112 | return 0; | |
113 | return 1; | |
114 | } | |
115 | ||
116 | /*****************************************************************************/ | |
117 | /* | |
118 | * read the program headers table into memory | |
119 | */ | |
8a2ab7f5 DH |
120 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, |
121 | struct file *file) | |
1da177e4 LT |
122 | { |
123 | struct elf32_phdr *phdr; | |
124 | unsigned long size; | |
125 | int retval, loop; | |
126 | ||
127 | if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) | |
128 | return -ENOMEM; | |
129 | if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) | |
130 | return -ENOMEM; | |
131 | ||
132 | size = params->hdr.e_phnum * sizeof(struct elf_phdr); | |
133 | params->phdrs = kmalloc(size, GFP_KERNEL); | |
134 | if (!params->phdrs) | |
135 | return -ENOMEM; | |
136 | ||
8a2ab7f5 DH |
137 | retval = kernel_read(file, params->hdr.e_phoff, |
138 | (char *) params->phdrs, size); | |
e1d2c8b6 DH |
139 | if (unlikely(retval != size)) |
140 | return retval < 0 ? retval : -ENOEXEC; | |
1da177e4 LT |
141 | |
142 | /* determine stack size for this binary */ | |
143 | phdr = params->phdrs; | |
144 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
145 | if (phdr->p_type != PT_GNU_STACK) | |
146 | continue; | |
147 | ||
148 | if (phdr->p_flags & PF_X) | |
149 | params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; | |
150 | else | |
151 | params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; | |
152 | ||
153 | params->stack_size = phdr->p_memsz; | |
154 | break; | |
155 | } | |
156 | ||
157 | return 0; | |
8a2ab7f5 | 158 | } |
1da177e4 LT |
159 | |
160 | /*****************************************************************************/ | |
161 | /* | |
162 | * load an fdpic binary into various bits of memory | |
163 | */ | |
8a2ab7f5 DH |
164 | static int load_elf_fdpic_binary(struct linux_binprm *bprm, |
165 | struct pt_regs *regs) | |
1da177e4 LT |
166 | { |
167 | struct elf_fdpic_params exec_params, interp_params; | |
168 | struct elf_phdr *phdr; | |
8a2ab7f5 DH |
169 | unsigned long stack_size, entryaddr; |
170 | #ifndef CONFIG_MMU | |
171 | unsigned long fullsize; | |
172 | #endif | |
173 | #ifdef ELF_FDPIC_PLAT_INIT | |
174 | unsigned long dynaddr; | |
175 | #endif | |
1da177e4 LT |
176 | struct file *interpreter = NULL; /* to shut gcc up */ |
177 | char *interpreter_name = NULL; | |
178 | int executable_stack; | |
179 | int retval, i; | |
180 | ||
aa289b47 DH |
181 | kdebug("____ LOAD %d ____", current->pid); |
182 | ||
1da177e4 LT |
183 | memset(&exec_params, 0, sizeof(exec_params)); |
184 | memset(&interp_params, 0, sizeof(interp_params)); | |
185 | ||
186 | exec_params.hdr = *(struct elfhdr *) bprm->buf; | |
187 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; | |
188 | ||
189 | /* check that this is a binary we know how to deal with */ | |
190 | retval = -ENOEXEC; | |
191 | if (!is_elf_fdpic(&exec_params.hdr, bprm->file)) | |
192 | goto error; | |
193 | ||
194 | /* read the program header table */ | |
195 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); | |
196 | if (retval < 0) | |
197 | goto error; | |
198 | ||
199 | /* scan for a program header that specifies an interpreter */ | |
200 | phdr = exec_params.phdrs; | |
201 | ||
202 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { | |
203 | switch (phdr->p_type) { | |
204 | case PT_INTERP: | |
205 | retval = -ENOMEM; | |
206 | if (phdr->p_filesz > PATH_MAX) | |
207 | goto error; | |
208 | retval = -ENOENT; | |
209 | if (phdr->p_filesz < 2) | |
210 | goto error; | |
211 | ||
212 | /* read the name of the interpreter into memory */ | |
792db3af | 213 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
1da177e4 LT |
214 | if (!interpreter_name) |
215 | goto error; | |
216 | ||
217 | retval = kernel_read(bprm->file, | |
218 | phdr->p_offset, | |
219 | interpreter_name, | |
220 | phdr->p_filesz); | |
e1d2c8b6 DH |
221 | if (unlikely(retval != phdr->p_filesz)) { |
222 | if (retval >= 0) | |
223 | retval = -ENOEXEC; | |
1da177e4 | 224 | goto error; |
e1d2c8b6 | 225 | } |
1da177e4 LT |
226 | |
227 | retval = -ENOENT; | |
228 | if (interpreter_name[phdr->p_filesz - 1] != '\0') | |
229 | goto error; | |
230 | ||
231 | kdebug("Using ELF interpreter %s", interpreter_name); | |
232 | ||
233 | /* replace the program with the interpreter */ | |
234 | interpreter = open_exec(interpreter_name); | |
235 | retval = PTR_ERR(interpreter); | |
236 | if (IS_ERR(interpreter)) { | |
237 | interpreter = NULL; | |
238 | goto error; | |
239 | } | |
240 | ||
1fb84496 AD |
241 | /* |
242 | * If the binary is not readable then enforce | |
243 | * mm->dumpable = 0 regardless of the interpreter's | |
244 | * permissions. | |
245 | */ | |
246 | if (file_permission(interpreter, MAY_READ) < 0) | |
247 | bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP; | |
248 | ||
8a2ab7f5 DH |
249 | retval = kernel_read(interpreter, 0, bprm->buf, |
250 | BINPRM_BUF_SIZE); | |
e1d2c8b6 DH |
251 | if (unlikely(retval != BINPRM_BUF_SIZE)) { |
252 | if (retval >= 0) | |
253 | retval = -ENOEXEC; | |
1da177e4 | 254 | goto error; |
e1d2c8b6 | 255 | } |
1da177e4 LT |
256 | |
257 | interp_params.hdr = *((struct elfhdr *) bprm->buf); | |
258 | break; | |
259 | ||
260 | case PT_LOAD: | |
261 | #ifdef CONFIG_MMU | |
262 | if (exec_params.load_addr == 0) | |
263 | exec_params.load_addr = phdr->p_vaddr; | |
264 | #endif | |
265 | break; | |
266 | } | |
267 | ||
268 | } | |
269 | ||
270 | if (elf_check_const_displacement(&exec_params.hdr)) | |
271 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; | |
272 | ||
273 | /* perform insanity checks on the interpreter */ | |
274 | if (interpreter_name) { | |
275 | retval = -ELIBBAD; | |
276 | if (!is_elf_fdpic(&interp_params.hdr, interpreter)) | |
277 | goto error; | |
278 | ||
279 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT; | |
280 | ||
281 | /* read the interpreter's program header table */ | |
282 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); | |
283 | if (retval < 0) | |
284 | goto error; | |
285 | } | |
286 | ||
287 | stack_size = exec_params.stack_size; | |
288 | if (stack_size < interp_params.stack_size) | |
289 | stack_size = interp_params.stack_size; | |
290 | ||
291 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) | |
292 | executable_stack = EXSTACK_ENABLE_X; | |
293 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) | |
294 | executable_stack = EXSTACK_DISABLE_X; | |
295 | else 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 | retval = -ENOEXEC; | |
303 | if (stack_size == 0) | |
304 | goto error; | |
305 | ||
306 | if (elf_check_const_displacement(&interp_params.hdr)) | |
307 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; | |
308 | ||
309 | /* flush all traces of the currently running executable */ | |
310 | retval = flush_old_exec(bprm); | |
311 | if (retval) | |
312 | goto error; | |
313 | ||
314 | /* there's now no turning back... the old userspace image is dead, | |
315 | * defunct, deceased, etc. after this point we have to exit via | |
316 | * error_kill */ | |
317 | set_personality(PER_LINUX_FDPIC); | |
318 | set_binfmt(&elf_fdpic_format); | |
319 | ||
320 | current->mm->start_code = 0; | |
321 | current->mm->end_code = 0; | |
322 | current->mm->start_stack = 0; | |
323 | current->mm->start_data = 0; | |
324 | current->mm->end_data = 0; | |
325 | current->mm->context.exec_fdpic_loadmap = 0; | |
326 | current->mm->context.interp_fdpic_loadmap = 0; | |
327 | ||
328 | current->flags &= ~PF_FORKNOEXEC; | |
329 | ||
330 | #ifdef CONFIG_MMU | |
331 | elf_fdpic_arch_lay_out_mm(&exec_params, | |
332 | &interp_params, | |
333 | ¤t->mm->start_stack, | |
334 | ¤t->mm->start_brk); | |
1da177e4 | 335 | |
8a2ab7f5 DH |
336 | retval = setup_arg_pages(bprm, current->mm->start_stack, |
337 | executable_stack); | |
1da177e4 LT |
338 | if (retval < 0) { |
339 | send_sig(SIGKILL, current, 0); | |
340 | goto error_kill; | |
341 | } | |
342 | #endif | |
343 | ||
344 | /* load the executable and interpreter into memory */ | |
8a2ab7f5 DH |
345 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
346 | "executable"); | |
1da177e4 LT |
347 | if (retval < 0) |
348 | goto error_kill; | |
349 | ||
350 | if (interpreter_name) { | |
351 | retval = elf_fdpic_map_file(&interp_params, interpreter, | |
352 | current->mm, "interpreter"); | |
353 | if (retval < 0) { | |
354 | printk(KERN_ERR "Unable to load interpreter\n"); | |
355 | goto error_kill; | |
356 | } | |
357 | ||
358 | allow_write_access(interpreter); | |
359 | fput(interpreter); | |
360 | interpreter = NULL; | |
361 | } | |
362 | ||
363 | #ifdef CONFIG_MMU | |
364 | if (!current->mm->start_brk) | |
365 | current->mm->start_brk = current->mm->end_data; | |
366 | ||
8a2ab7f5 DH |
367 | current->mm->brk = current->mm->start_brk = |
368 | PAGE_ALIGN(current->mm->start_brk); | |
1da177e4 LT |
369 | |
370 | #else | |
371 | /* create a stack and brk area big enough for everyone | |
372 | * - the brk heap starts at the bottom and works up | |
373 | * - the stack starts at the top and works down | |
374 | */ | |
375 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; | |
376 | if (stack_size < PAGE_SIZE * 2) | |
377 | stack_size = PAGE_SIZE * 2; | |
378 | ||
379 | down_write(¤t->mm->mmap_sem); | |
8a2ab7f5 | 380 | current->mm->start_brk = do_mmap(NULL, 0, stack_size, |
1da177e4 | 381 | PROT_READ | PROT_WRITE | PROT_EXEC, |
e10a4437 | 382 | MAP_PRIVATE | MAP_ANONYMOUS | MAP_GROWSDOWN, |
1da177e4 LT |
383 | 0); |
384 | ||
8a2ab7f5 | 385 | if (IS_ERR_VALUE(current->mm->start_brk)) { |
1da177e4 LT |
386 | up_write(¤t->mm->mmap_sem); |
387 | retval = current->mm->start_brk; | |
388 | current->mm->start_brk = 0; | |
389 | goto error_kill; | |
390 | } | |
391 | ||
8a2ab7f5 DH |
392 | /* expand the stack mapping to use up the entire allocation granule */ |
393 | fullsize = ksize((char *) current->mm->start_brk); | |
394 | if (!IS_ERR_VALUE(do_mremap(current->mm->start_brk, stack_size, | |
395 | fullsize, 0, 0))) | |
396 | stack_size = fullsize; | |
1da177e4 LT |
397 | up_write(¤t->mm->mmap_sem); |
398 | ||
399 | current->mm->brk = current->mm->start_brk; | |
400 | current->mm->context.end_brk = current->mm->start_brk; | |
8a2ab7f5 DH |
401 | current->mm->context.end_brk += |
402 | (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0; | |
1da177e4 LT |
403 | current->mm->start_stack = current->mm->start_brk + stack_size; |
404 | #endif | |
405 | ||
406 | compute_creds(bprm); | |
407 | current->flags &= ~PF_FORKNOEXEC; | |
8a2ab7f5 DH |
408 | if (create_elf_fdpic_tables(bprm, current->mm, |
409 | &exec_params, &interp_params) < 0) | |
1da177e4 LT |
410 | goto error_kill; |
411 | ||
8a2ab7f5 DH |
412 | kdebug("- start_code %lx", current->mm->start_code); |
413 | kdebug("- end_code %lx", current->mm->end_code); | |
414 | kdebug("- start_data %lx", current->mm->start_data); | |
415 | kdebug("- end_data %lx", current->mm->end_data); | |
416 | kdebug("- start_brk %lx", current->mm->start_brk); | |
417 | kdebug("- brk %lx", current->mm->brk); | |
418 | kdebug("- start_stack %lx", current->mm->start_stack); | |
1da177e4 LT |
419 | |
420 | #ifdef ELF_FDPIC_PLAT_INIT | |
421 | /* | |
422 | * The ABI may specify that certain registers be set up in special | |
423 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
424 | * example. This macro performs whatever initialization to | |
425 | * the regs structure is required. | |
426 | */ | |
8a2ab7f5 DH |
427 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; |
428 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, | |
429 | dynaddr); | |
1da177e4 LT |
430 | #endif |
431 | ||
432 | /* everything is now ready... get the userspace context ready to roll */ | |
8a2ab7f5 DH |
433 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
434 | start_thread(regs, entryaddr, current->mm->start_stack); | |
1da177e4 LT |
435 | |
436 | if (unlikely(current->ptrace & PT_PTRACED)) { | |
437 | if (current->ptrace & PT_TRACE_EXEC) | |
8a2ab7f5 | 438 | ptrace_notify((PTRACE_EVENT_EXEC << 8) | SIGTRAP); |
1da177e4 LT |
439 | else |
440 | send_sig(SIGTRAP, current, 0); | |
441 | } | |
442 | ||
443 | retval = 0; | |
444 | ||
445 | error: | |
446 | if (interpreter) { | |
447 | allow_write_access(interpreter); | |
448 | fput(interpreter); | |
449 | } | |
f99d49ad JJ |
450 | kfree(interpreter_name); |
451 | kfree(exec_params.phdrs); | |
452 | kfree(exec_params.loadmap); | |
453 | kfree(interp_params.phdrs); | |
454 | kfree(interp_params.loadmap); | |
1da177e4 LT |
455 | return retval; |
456 | ||
457 | /* unrecoverable error - kill the process */ | |
8a2ab7f5 | 458 | error_kill: |
1da177e4 LT |
459 | send_sig(SIGSEGV, current, 0); |
460 | goto error; | |
461 | ||
8a2ab7f5 | 462 | } |
1da177e4 LT |
463 | |
464 | /*****************************************************************************/ | |
465 | /* | |
466 | * present useful information to the program | |
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 | { | |
473 | unsigned long sp, csp, nitems; | |
530018bf | 474 | elf_caddr_t __user *argv, *envp; |
1da177e4 | 475 | size_t platform_len = 0, len; |
530018bf AV |
476 | char *k_platform; |
477 | char __user *u_platform, *p; | |
1da177e4 LT |
478 | long hwcap; |
479 | int loop; | |
480 | ||
481 | /* we're going to shovel a whole load of stuff onto the stack */ | |
482 | #ifdef CONFIG_MMU | |
483 | sp = bprm->p; | |
484 | #else | |
485 | sp = mm->start_stack; | |
486 | ||
487 | /* stack the program arguments and environment */ | |
488 | if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0) | |
489 | return -EFAULT; | |
490 | #endif | |
491 | ||
492 | /* get hold of platform and hardware capabilities masks for the machine | |
493 | * we are running on. In some cases (Sparc), this info is impossible | |
494 | * to get, in others (i386) it is merely difficult. | |
495 | */ | |
496 | hwcap = ELF_HWCAP; | |
497 | k_platform = ELF_PLATFORM; | |
1aeb21d6 | 498 | u_platform = NULL; |
1da177e4 LT |
499 | |
500 | if (k_platform) { | |
501 | platform_len = strlen(k_platform) + 1; | |
502 | sp -= platform_len; | |
530018bf | 503 | u_platform = (char __user *) sp; |
1da177e4 LT |
504 | if (__copy_to_user(u_platform, k_platform, platform_len) != 0) |
505 | return -EFAULT; | |
506 | } | |
507 | ||
1da177e4 LT |
508 | #if defined(__i386__) && defined(CONFIG_SMP) |
509 | /* in some cases (e.g. Hyper-Threading), we want to avoid L1 evictions | |
8a2ab7f5 DH |
510 | * by the processes running on the same package. One thing we can do is |
511 | * to shuffle the initial stack for them. | |
1da177e4 | 512 | * |
8a2ab7f5 DH |
513 | * the conditionals here are unneeded, but kept in to make the code |
514 | * behaviour the same as pre change unless we have hyperthreaded | |
1da177e4 LT |
515 | * processors. This keeps Mr Marcelo Person happier but should be |
516 | * removed for 2.5 | |
517 | */ | |
518 | if (smp_num_siblings > 1) | |
519 | sp = sp - ((current->pid % 64) << 7); | |
520 | #endif | |
521 | ||
522 | sp &= ~7UL; | |
523 | ||
524 | /* stack the load map(s) */ | |
525 | len = sizeof(struct elf32_fdpic_loadmap); | |
526 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; | |
527 | sp = (sp - len) & ~7UL; | |
528 | exec_params->map_addr = sp; | |
529 | ||
530018bf | 530 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
1da177e4 LT |
531 | return -EFAULT; |
532 | ||
533 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; | |
534 | ||
535 | if (interp_params->loadmap) { | |
536 | len = sizeof(struct elf32_fdpic_loadmap); | |
8a2ab7f5 DH |
537 | len += sizeof(struct elf32_fdpic_loadseg) * |
538 | interp_params->loadmap->nsegs; | |
1da177e4 LT |
539 | sp = (sp - len) & ~7UL; |
540 | interp_params->map_addr = sp; | |
541 | ||
8a2ab7f5 DH |
542 | if (copy_to_user((void __user *) sp, interp_params->loadmap, |
543 | len) != 0) | |
1da177e4 LT |
544 | return -EFAULT; |
545 | ||
546 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; | |
547 | } | |
548 | ||
549 | /* force 16 byte _final_ alignment here for generality */ | |
550 | #define DLINFO_ITEMS 13 | |
551 | ||
552 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0); | |
553 | #ifdef DLINFO_ARCH_ITEMS | |
554 | nitems += DLINFO_ARCH_ITEMS; | |
555 | #endif | |
556 | ||
557 | csp = sp; | |
558 | sp -= nitems * 2 * sizeof(unsigned long); | |
559 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ | |
560 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ | |
561 | sp -= 1 * sizeof(unsigned long); /* argc */ | |
562 | ||
563 | csp -= sp & 15UL; | |
564 | sp -= sp & 15UL; | |
565 | ||
566 | /* put the ELF interpreter info on the stack */ | |
8a2ab7f5 DH |
567 | #define NEW_AUX_ENT(nr, id, val) \ |
568 | do { \ | |
569 | struct { unsigned long _id, _val; } __user *ent; \ | |
570 | \ | |
571 | ent = (void __user *) csp; \ | |
572 | __put_user((id), &ent[nr]._id); \ | |
573 | __put_user((val), &ent[nr]._val); \ | |
1da177e4 LT |
574 | } while (0) |
575 | ||
576 | csp -= 2 * sizeof(unsigned long); | |
577 | NEW_AUX_ENT(0, AT_NULL, 0); | |
578 | if (k_platform) { | |
579 | csp -= 2 * sizeof(unsigned long); | |
8a2ab7f5 DH |
580 | NEW_AUX_ENT(0, AT_PLATFORM, |
581 | (elf_addr_t) (unsigned long) u_platform); | |
1da177e4 LT |
582 | } |
583 | ||
584 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); | |
8a2ab7f5 DH |
585 | NEW_AUX_ENT( 0, AT_HWCAP, hwcap); |
586 | NEW_AUX_ENT( 1, AT_PAGESZ, PAGE_SIZE); | |
587 | NEW_AUX_ENT( 2, AT_CLKTCK, CLOCKS_PER_SEC); | |
588 | NEW_AUX_ENT( 3, AT_PHDR, exec_params->ph_addr); | |
589 | NEW_AUX_ENT( 4, AT_PHENT, sizeof(struct elf_phdr)); | |
590 | NEW_AUX_ENT( 5, AT_PHNUM, exec_params->hdr.e_phnum); | |
591 | NEW_AUX_ENT( 6, AT_BASE, interp_params->elfhdr_addr); | |
592 | NEW_AUX_ENT( 7, AT_FLAGS, 0); | |
593 | NEW_AUX_ENT( 8, AT_ENTRY, exec_params->entry_addr); | |
594 | NEW_AUX_ENT( 9, AT_UID, (elf_addr_t) current->uid); | |
595 | NEW_AUX_ENT(10, AT_EUID, (elf_addr_t) current->euid); | |
596 | NEW_AUX_ENT(11, AT_GID, (elf_addr_t) current->gid); | |
597 | NEW_AUX_ENT(12, AT_EGID, (elf_addr_t) current->egid); | |
1da177e4 LT |
598 | |
599 | #ifdef ARCH_DLINFO | |
600 | /* ARCH_DLINFO must come last so platform specific code can enforce | |
601 | * special alignment requirements on the AUXV if necessary (eg. PPC). | |
602 | */ | |
603 | ARCH_DLINFO; | |
604 | #endif | |
605 | #undef NEW_AUX_ENT | |
606 | ||
607 | /* allocate room for argv[] and envv[] */ | |
608 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); | |
530018bf | 609 | envp = (elf_caddr_t __user *) csp; |
1da177e4 | 610 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
530018bf | 611 | argv = (elf_caddr_t __user *) csp; |
1da177e4 LT |
612 | |
613 | /* stack argc */ | |
614 | csp -= sizeof(unsigned long); | |
530018bf | 615 | __put_user(bprm->argc, (unsigned long __user *) csp); |
1da177e4 | 616 | |
88bcd512 | 617 | BUG_ON(csp != sp); |
1da177e4 LT |
618 | |
619 | /* fill in the argv[] array */ | |
620 | #ifdef CONFIG_MMU | |
621 | current->mm->arg_start = bprm->p; | |
622 | #else | |
8a2ab7f5 DH |
623 | current->mm->arg_start = current->mm->start_stack - |
624 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); | |
1da177e4 LT |
625 | #endif |
626 | ||
530018bf | 627 | p = (char __user *) current->mm->arg_start; |
1da177e4 LT |
628 | for (loop = bprm->argc; loop > 0; loop--) { |
629 | __put_user((elf_caddr_t) p, argv++); | |
b6a2fea3 OW |
630 | len = strnlen_user(p, MAX_ARG_STRLEN); |
631 | if (!len || len > MAX_ARG_STRLEN) | |
1da177e4 LT |
632 | return -EINVAL; |
633 | p += len; | |
634 | } | |
635 | __put_user(NULL, argv); | |
636 | current->mm->arg_end = (unsigned long) p; | |
637 | ||
638 | /* fill in the envv[] array */ | |
639 | current->mm->env_start = (unsigned long) p; | |
640 | for (loop = bprm->envc; loop > 0; loop--) { | |
641 | __put_user((elf_caddr_t)(unsigned long) p, envp++); | |
b6a2fea3 OW |
642 | len = strnlen_user(p, MAX_ARG_STRLEN); |
643 | if (!len || len > MAX_ARG_STRLEN) | |
1da177e4 LT |
644 | return -EINVAL; |
645 | p += len; | |
646 | } | |
647 | __put_user(NULL, envp); | |
648 | current->mm->env_end = (unsigned long) p; | |
649 | ||
650 | mm->start_stack = (unsigned long) sp; | |
651 | return 0; | |
8a2ab7f5 | 652 | } |
1da177e4 LT |
653 | |
654 | /*****************************************************************************/ | |
655 | /* | |
656 | * transfer the program arguments and environment from the holding pages onto | |
657 | * the stack | |
658 | */ | |
659 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
660 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm, |
661 | unsigned long *_sp) | |
1da177e4 LT |
662 | { |
663 | unsigned long index, stop, sp; | |
664 | char *src; | |
665 | int ret = 0; | |
666 | ||
667 | stop = bprm->p >> PAGE_SHIFT; | |
668 | sp = *_sp; | |
669 | ||
670 | for (index = MAX_ARG_PAGES - 1; index >= stop; index--) { | |
671 | src = kmap(bprm->page[index]); | |
672 | sp -= PAGE_SIZE; | |
673 | if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0) | |
674 | ret = -EFAULT; | |
675 | kunmap(bprm->page[index]); | |
676 | if (ret < 0) | |
677 | goto out; | |
678 | } | |
679 | ||
680 | *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15; | |
681 | ||
8a2ab7f5 | 682 | out: |
1da177e4 | 683 | return ret; |
8a2ab7f5 | 684 | } |
1da177e4 LT |
685 | #endif |
686 | ||
687 | /*****************************************************************************/ | |
688 | /* | |
689 | * load the appropriate binary image (executable or interpreter) into memory | |
690 | * - we assume no MMU is available | |
691 | * - if no other PIC bits are set in params->hdr->e_flags | |
692 | * - we assume that the LOADable segments in the binary are independently relocatable | |
693 | * - we assume R/O executable segments are shareable | |
694 | * - else | |
695 | * - we assume the loadable parts of the image to require fixed displacement | |
696 | * - the image is not shareable | |
697 | */ | |
698 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, | |
699 | struct file *file, | |
700 | struct mm_struct *mm, | |
701 | const char *what) | |
702 | { | |
703 | struct elf32_fdpic_loadmap *loadmap; | |
704 | #ifdef CONFIG_MMU | |
705 | struct elf32_fdpic_loadseg *mseg; | |
706 | #endif | |
707 | struct elf32_fdpic_loadseg *seg; | |
708 | struct elf32_phdr *phdr; | |
709 | unsigned long load_addr, stop; | |
710 | unsigned nloads, tmp; | |
711 | size_t size; | |
712 | int loop, ret; | |
713 | ||
714 | /* allocate a load map table */ | |
715 | nloads = 0; | |
716 | for (loop = 0; loop < params->hdr.e_phnum; loop++) | |
717 | if (params->phdrs[loop].p_type == PT_LOAD) | |
718 | nloads++; | |
719 | ||
720 | if (nloads == 0) | |
721 | return -ELIBBAD; | |
722 | ||
723 | size = sizeof(*loadmap) + nloads * sizeof(*seg); | |
b87576d5 | 724 | loadmap = kzalloc(size, GFP_KERNEL); |
1da177e4 LT |
725 | if (!loadmap) |
726 | return -ENOMEM; | |
727 | ||
728 | params->loadmap = loadmap; | |
1da177e4 LT |
729 | |
730 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; | |
731 | loadmap->nsegs = nloads; | |
732 | ||
733 | load_addr = params->load_addr; | |
734 | seg = loadmap->segs; | |
735 | ||
736 | /* map the requested LOADs into the memory space */ | |
737 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
738 | case ELF_FDPIC_FLAG_CONSTDISP: | |
739 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
740 | #ifndef CONFIG_MMU | |
741 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); | |
742 | if (ret < 0) | |
743 | return ret; | |
744 | break; | |
745 | #endif | |
746 | default: | |
747 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); | |
748 | if (ret < 0) | |
749 | return ret; | |
750 | break; | |
751 | } | |
752 | ||
753 | /* map the entry point */ | |
754 | if (params->hdr.e_entry) { | |
755 | seg = loadmap->segs; | |
756 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
757 | if (params->hdr.e_entry >= seg->p_vaddr && | |
8a2ab7f5 | 758 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
1da177e4 | 759 | params->entry_addr = |
8a2ab7f5 DH |
760 | (params->hdr.e_entry - seg->p_vaddr) + |
761 | seg->addr; | |
1da177e4 LT |
762 | break; |
763 | } | |
764 | } | |
765 | } | |
766 | ||
767 | /* determine where the program header table has wound up if mapped */ | |
8a2ab7f5 DH |
768 | stop = params->hdr.e_phoff; |
769 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); | |
1da177e4 LT |
770 | phdr = params->phdrs; |
771 | ||
772 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
773 | if (phdr->p_type != PT_LOAD) | |
774 | continue; | |
775 | ||
776 | if (phdr->p_offset > params->hdr.e_phoff || | |
777 | phdr->p_offset + phdr->p_filesz < stop) | |
778 | continue; | |
779 | ||
780 | seg = loadmap->segs; | |
781 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
782 | if (phdr->p_vaddr >= seg->p_vaddr && | |
8a2ab7f5 DH |
783 | phdr->p_vaddr + phdr->p_filesz <= |
784 | seg->p_vaddr + seg->p_memsz) { | |
785 | params->ph_addr = | |
786 | (phdr->p_vaddr - seg->p_vaddr) + | |
787 | seg->addr + | |
1da177e4 LT |
788 | params->hdr.e_phoff - phdr->p_offset; |
789 | break; | |
790 | } | |
791 | } | |
792 | break; | |
793 | } | |
794 | ||
795 | /* determine where the dynamic section has wound up if there is one */ | |
796 | phdr = params->phdrs; | |
797 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
798 | if (phdr->p_type != PT_DYNAMIC) | |
799 | continue; | |
800 | ||
801 | seg = loadmap->segs; | |
802 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
803 | if (phdr->p_vaddr >= seg->p_vaddr && | |
8a2ab7f5 DH |
804 | phdr->p_vaddr + phdr->p_memsz <= |
805 | seg->p_vaddr + seg->p_memsz) { | |
806 | params->dynamic_addr = | |
807 | (phdr->p_vaddr - seg->p_vaddr) + | |
808 | seg->addr; | |
809 | ||
810 | /* check the dynamic section contains at least | |
811 | * one item, and that the last item is a NULL | |
812 | * entry */ | |
1da177e4 LT |
813 | if (phdr->p_memsz == 0 || |
814 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) | |
815 | goto dynamic_error; | |
816 | ||
817 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); | |
8a2ab7f5 DH |
818 | if (((Elf32_Dyn *) |
819 | params->dynamic_addr)[tmp - 1].d_tag != 0) | |
1da177e4 LT |
820 | goto dynamic_error; |
821 | break; | |
822 | } | |
823 | } | |
824 | break; | |
825 | } | |
826 | ||
827 | /* now elide adjacent segments in the load map on MMU linux | |
8a2ab7f5 DH |
828 | * - on uClinux the holes between may actually be filled with system |
829 | * stuff or stuff from other processes | |
1da177e4 LT |
830 | */ |
831 | #ifdef CONFIG_MMU | |
832 | nloads = loadmap->nsegs; | |
833 | mseg = loadmap->segs; | |
834 | seg = mseg + 1; | |
835 | for (loop = 1; loop < nloads; loop++) { | |
836 | /* see if we have a candidate for merging */ | |
837 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { | |
838 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); | |
839 | if (load_addr == (seg->addr & PAGE_MASK)) { | |
8a2ab7f5 DH |
840 | mseg->p_memsz += |
841 | load_addr - | |
842 | (mseg->addr + mseg->p_memsz); | |
1da177e4 LT |
843 | mseg->p_memsz += seg->addr & ~PAGE_MASK; |
844 | mseg->p_memsz += seg->p_memsz; | |
845 | loadmap->nsegs--; | |
846 | continue; | |
847 | } | |
848 | } | |
849 | ||
850 | mseg++; | |
851 | if (mseg != seg) | |
852 | *mseg = *seg; | |
853 | } | |
854 | #endif | |
855 | ||
856 | kdebug("Mapped Object [%s]:", what); | |
857 | kdebug("- elfhdr : %lx", params->elfhdr_addr); | |
858 | kdebug("- entry : %lx", params->entry_addr); | |
859 | kdebug("- PHDR[] : %lx", params->ph_addr); | |
860 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); | |
861 | seg = loadmap->segs; | |
862 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) | |
863 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", | |
864 | loop, | |
865 | seg->addr, seg->addr + seg->p_memsz - 1, | |
866 | seg->p_vaddr, seg->p_memsz); | |
867 | ||
868 | return 0; | |
869 | ||
8a2ab7f5 | 870 | dynamic_error: |
1da177e4 | 871 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
0f7fc9e4 | 872 | what, file->f_path.dentry->d_inode->i_ino); |
1da177e4 | 873 | return -ELIBBAD; |
8a2ab7f5 | 874 | } |
1da177e4 LT |
875 | |
876 | /*****************************************************************************/ | |
877 | /* | |
878 | * map a file with constant displacement under uClinux | |
879 | */ | |
880 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
881 | static int elf_fdpic_map_file_constdisp_on_uclinux( |
882 | struct elf_fdpic_params *params, | |
883 | struct file *file, | |
884 | struct mm_struct *mm) | |
1da177e4 LT |
885 | { |
886 | struct elf32_fdpic_loadseg *seg; | |
887 | struct elf32_phdr *phdr; | |
888 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags; | |
889 | loff_t fpos; | |
890 | int loop, ret; | |
891 | ||
892 | load_addr = params->load_addr; | |
893 | seg = params->loadmap->segs; | |
894 | ||
8a2ab7f5 DH |
895 | /* determine the bounds of the contiguous overall allocation we must |
896 | * make */ | |
1da177e4 LT |
897 | phdr = params->phdrs; |
898 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
899 | if (params->phdrs[loop].p_type != PT_LOAD) | |
900 | continue; | |
901 | ||
902 | if (base > phdr->p_vaddr) | |
903 | base = phdr->p_vaddr; | |
904 | if (top < phdr->p_vaddr + phdr->p_memsz) | |
905 | top = phdr->p_vaddr + phdr->p_memsz; | |
906 | } | |
907 | ||
908 | /* allocate one big anon block for everything */ | |
909 | mflags = MAP_PRIVATE; | |
910 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
911 | mflags |= MAP_EXECUTABLE; | |
912 | ||
913 | down_write(&mm->mmap_sem); | |
914 | maddr = do_mmap(NULL, load_addr, top - base, | |
915 | PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); | |
916 | up_write(&mm->mmap_sem); | |
8a2ab7f5 | 917 | if (IS_ERR_VALUE(maddr)) |
1da177e4 LT |
918 | return (int) maddr; |
919 | ||
920 | if (load_addr != 0) | |
921 | load_addr += PAGE_ALIGN(top - base); | |
922 | ||
923 | /* and then load the file segments into it */ | |
924 | phdr = params->phdrs; | |
925 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
926 | if (params->phdrs[loop].p_type != PT_LOAD) | |
927 | continue; | |
928 | ||
929 | fpos = phdr->p_offset; | |
930 | ||
931 | seg->addr = maddr + (phdr->p_vaddr - base); | |
932 | seg->p_vaddr = phdr->p_vaddr; | |
933 | seg->p_memsz = phdr->p_memsz; | |
934 | ||
8a2ab7f5 DH |
935 | ret = file->f_op->read(file, (void *) seg->addr, |
936 | phdr->p_filesz, &fpos); | |
1da177e4 LT |
937 | if (ret < 0) |
938 | return ret; | |
939 | ||
940 | /* map the ELF header address if in this segment */ | |
941 | if (phdr->p_offset == 0) | |
942 | params->elfhdr_addr = seg->addr; | |
943 | ||
944 | /* clear any space allocated but not loaded */ | |
945 | if (phdr->p_filesz < phdr->p_memsz) | |
946 | clear_user((void *) (seg->addr + phdr->p_filesz), | |
947 | phdr->p_memsz - phdr->p_filesz); | |
948 | ||
949 | if (mm) { | |
950 | if (phdr->p_flags & PF_X) { | |
aa289b47 DH |
951 | if (!mm->start_code) { |
952 | mm->start_code = seg->addr; | |
953 | mm->end_code = seg->addr + | |
954 | phdr->p_memsz; | |
955 | } | |
8a2ab7f5 | 956 | } else if (!mm->start_data) { |
1da177e4 LT |
957 | mm->start_data = seg->addr; |
958 | #ifndef CONFIG_MMU | |
959 | mm->end_data = seg->addr + phdr->p_memsz; | |
960 | #endif | |
961 | } | |
962 | ||
963 | #ifdef CONFIG_MMU | |
964 | if (seg->addr + phdr->p_memsz > mm->end_data) | |
965 | mm->end_data = seg->addr + phdr->p_memsz; | |
966 | #endif | |
967 | } | |
968 | ||
969 | seg++; | |
970 | } | |
971 | ||
972 | return 0; | |
8a2ab7f5 | 973 | } |
1da177e4 LT |
974 | #endif |
975 | ||
976 | /*****************************************************************************/ | |
977 | /* | |
978 | * map a binary by direct mmap() of the individual PT_LOAD segments | |
979 | */ | |
980 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, | |
981 | struct file *file, | |
982 | struct mm_struct *mm) | |
983 | { | |
984 | struct elf32_fdpic_loadseg *seg; | |
985 | struct elf32_phdr *phdr; | |
986 | unsigned long load_addr, delta_vaddr; | |
987 | int loop, dvset; | |
988 | ||
989 | load_addr = params->load_addr; | |
990 | delta_vaddr = 0; | |
991 | dvset = 0; | |
992 | ||
993 | seg = params->loadmap->segs; | |
994 | ||
995 | /* deal with each load segment separately */ | |
996 | phdr = params->phdrs; | |
997 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
998 | unsigned long maddr, disp, excess, excess1; | |
999 | int prot = 0, flags; | |
1000 | ||
1001 | if (phdr->p_type != PT_LOAD) | |
1002 | continue; | |
1003 | ||
1004 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", | |
1005 | (unsigned long) phdr->p_vaddr, | |
1006 | (unsigned long) phdr->p_offset, | |
1007 | (unsigned long) phdr->p_filesz, | |
1008 | (unsigned long) phdr->p_memsz); | |
1009 | ||
1010 | /* determine the mapping parameters */ | |
1011 | if (phdr->p_flags & PF_R) prot |= PROT_READ; | |
1012 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; | |
1013 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; | |
1014 | ||
1015 | flags = MAP_PRIVATE | MAP_DENYWRITE; | |
1016 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
1017 | flags |= MAP_EXECUTABLE; | |
1018 | ||
1019 | maddr = 0; | |
1020 | ||
1021 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
1022 | case ELF_FDPIC_FLAG_INDEPENDENT: | |
1023 | /* PT_LOADs are independently locatable */ | |
1024 | break; | |
1025 | ||
1026 | case ELF_FDPIC_FLAG_HONOURVADDR: | |
1027 | /* the specified virtual address must be honoured */ | |
1028 | maddr = phdr->p_vaddr; | |
1029 | flags |= MAP_FIXED; | |
1030 | break; | |
1031 | ||
1032 | case ELF_FDPIC_FLAG_CONSTDISP: | |
1033 | /* constant displacement | |
8a2ab7f5 DH |
1034 | * - can be mapped anywhere, but must be mapped as a |
1035 | * unit | |
1da177e4 LT |
1036 | */ |
1037 | if (!dvset) { | |
1038 | maddr = load_addr; | |
1039 | delta_vaddr = phdr->p_vaddr; | |
1040 | dvset = 1; | |
8a2ab7f5 | 1041 | } else { |
1da177e4 LT |
1042 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
1043 | flags |= MAP_FIXED; | |
1044 | } | |
1045 | break; | |
1046 | ||
1047 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
1048 | /* contiguity handled later */ | |
1049 | break; | |
1050 | ||
1051 | default: | |
1052 | BUG(); | |
1053 | } | |
1054 | ||
1055 | maddr &= PAGE_MASK; | |
1056 | ||
1057 | /* create the mapping */ | |
1058 | disp = phdr->p_vaddr & ~PAGE_MASK; | |
1059 | down_write(&mm->mmap_sem); | |
1060 | maddr = do_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, | |
1061 | phdr->p_offset - disp); | |
1062 | up_write(&mm->mmap_sem); | |
1063 | ||
1064 | kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", | |
8a2ab7f5 DH |
1065 | loop, phdr->p_memsz + disp, prot, flags, |
1066 | phdr->p_offset - disp, maddr); | |
1da177e4 | 1067 | |
8a2ab7f5 | 1068 | if (IS_ERR_VALUE(maddr)) |
1da177e4 LT |
1069 | return (int) maddr; |
1070 | ||
8a2ab7f5 DH |
1071 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
1072 | ELF_FDPIC_FLAG_CONTIGUOUS) | |
1da177e4 LT |
1073 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
1074 | ||
1075 | seg->addr = maddr + disp; | |
1076 | seg->p_vaddr = phdr->p_vaddr; | |
1077 | seg->p_memsz = phdr->p_memsz; | |
1078 | ||
1079 | /* map the ELF header address if in this segment */ | |
1080 | if (phdr->p_offset == 0) | |
1081 | params->elfhdr_addr = seg->addr; | |
1082 | ||
8a2ab7f5 DH |
1083 | /* clear the bit between beginning of mapping and beginning of |
1084 | * PT_LOAD */ | |
1da177e4 LT |
1085 | if (prot & PROT_WRITE && disp > 0) { |
1086 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); | |
530018bf | 1087 | clear_user((void __user *) maddr, disp); |
1da177e4 LT |
1088 | maddr += disp; |
1089 | } | |
1090 | ||
1091 | /* clear any space allocated but not loaded | |
1092 | * - on uClinux we can just clear the lot | |
1093 | * - on MMU linux we'll get a SIGBUS beyond the last page | |
1094 | * extant in the file | |
1095 | */ | |
1096 | excess = phdr->p_memsz - phdr->p_filesz; | |
1097 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); | |
1098 | ||
1099 | #ifdef CONFIG_MMU | |
1da177e4 LT |
1100 | if (excess > excess1) { |
1101 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; | |
1102 | unsigned long xmaddr; | |
1103 | ||
1104 | flags |= MAP_FIXED | MAP_ANONYMOUS; | |
1105 | down_write(&mm->mmap_sem); | |
8a2ab7f5 DH |
1106 | xmaddr = do_mmap(NULL, xaddr, excess - excess1, |
1107 | prot, flags, 0); | |
1da177e4 LT |
1108 | up_write(&mm->mmap_sem); |
1109 | ||
1110 | kdebug("mmap[%d] <anon>" | |
1111 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", | |
8a2ab7f5 DH |
1112 | loop, xaddr, excess - excess1, prot, flags, |
1113 | xmaddr); | |
1da177e4 LT |
1114 | |
1115 | if (xmaddr != xaddr) | |
1116 | return -ENOMEM; | |
1117 | } | |
1118 | ||
1119 | if (prot & PROT_WRITE && excess1 > 0) { | |
1120 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1121 | loop, maddr + phdr->p_filesz, excess1); | |
8a2ab7f5 DH |
1122 | clear_user((void __user *) maddr + phdr->p_filesz, |
1123 | excess1); | |
1da177e4 LT |
1124 | } |
1125 | ||
1126 | #else | |
1127 | if (excess > 0) { | |
1128 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1129 | loop, maddr + phdr->p_filesz, excess); | |
1130 | clear_user((void *) maddr + phdr->p_filesz, excess); | |
1131 | } | |
1132 | #endif | |
1133 | ||
1134 | if (mm) { | |
1135 | if (phdr->p_flags & PF_X) { | |
aa289b47 DH |
1136 | if (!mm->start_code) { |
1137 | mm->start_code = maddr; | |
1138 | mm->end_code = maddr + phdr->p_memsz; | |
1139 | } | |
8a2ab7f5 | 1140 | } else if (!mm->start_data) { |
1da177e4 LT |
1141 | mm->start_data = maddr; |
1142 | mm->end_data = maddr + phdr->p_memsz; | |
1143 | } | |
1144 | } | |
1145 | ||
1146 | seg++; | |
1147 | } | |
1148 | ||
1149 | return 0; | |
8a2ab7f5 | 1150 | } |
6d8c4e3b DH |
1151 | |
1152 | /*****************************************************************************/ | |
1153 | /* | |
1154 | * ELF-FDPIC core dumper | |
1155 | * | |
1156 | * Modelled on fs/exec.c:aout_core_dump() | |
1157 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1158 | * | |
1159 | * Modelled on fs/binfmt_elf.c core dumper | |
1160 | */ | |
1161 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) | |
1162 | ||
1163 | /* | |
1164 | * These are the only things you should do on a core-file: use only these | |
1165 | * functions to write out all the necessary info. | |
1166 | */ | |
1167 | static int dump_write(struct file *file, const void *addr, int nr) | |
1168 | { | |
1169 | return file->f_op->write(file, addr, nr, &file->f_pos) == nr; | |
1170 | } | |
1171 | ||
1172 | static int dump_seek(struct file *file, loff_t off) | |
1173 | { | |
1174 | if (file->f_op->llseek) { | |
1175 | if (file->f_op->llseek(file, off, SEEK_SET) != off) | |
1176 | return 0; | |
1177 | } else { | |
1178 | file->f_pos = off; | |
1179 | } | |
1180 | return 1; | |
1181 | } | |
1182 | ||
1183 | /* | |
1184 | * Decide whether a segment is worth dumping; default is yes to be | |
1185 | * sure (missing info is worse than too much; etc). | |
1186 | * Personally I'd include everything, and use the coredump limit... | |
1187 | * | |
1188 | * I think we should skip something. But I am not sure how. H.J. | |
1189 | */ | |
ee78b0a6 | 1190 | static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) |
6d8c4e3b | 1191 | { |
ee78b0a6 KH |
1192 | int dump_ok; |
1193 | ||
6d8c4e3b DH |
1194 | /* Do not dump I/O mapped devices or special mappings */ |
1195 | if (vma->vm_flags & (VM_IO | VM_RESERVED)) { | |
1196 | kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags); | |
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | /* If we may not read the contents, don't allow us to dump | |
1201 | * them either. "dump_write()" can't handle it anyway. | |
1202 | */ | |
1203 | if (!(vma->vm_flags & VM_READ)) { | |
1204 | kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags); | |
1205 | return 0; | |
1206 | } | |
1207 | ||
ee78b0a6 | 1208 | /* By default, dump shared memory if mapped from an anonymous file. */ |
6d8c4e3b | 1209 | if (vma->vm_flags & VM_SHARED) { |
0f7fc9e4 | 1210 | if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0) { |
ee78b0a6 KH |
1211 | dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags); |
1212 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, | |
1213 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1214 | return dump_ok; | |
6d8c4e3b DH |
1215 | } |
1216 | ||
ee78b0a6 KH |
1217 | dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags); |
1218 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, | |
1219 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1220 | return dump_ok; | |
6d8c4e3b DH |
1221 | } |
1222 | ||
1223 | #ifdef CONFIG_MMU | |
ee78b0a6 | 1224 | /* By default, if it hasn't been written to, don't write it out */ |
6d8c4e3b | 1225 | if (!vma->anon_vma) { |
ee78b0a6 KH |
1226 | dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags); |
1227 | kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start, | |
1228 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1229 | return dump_ok; | |
6d8c4e3b DH |
1230 | } |
1231 | #endif | |
1232 | ||
ee78b0a6 KH |
1233 | dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags); |
1234 | kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags, | |
1235 | dump_ok ? "yes" : "no"); | |
1236 | return dump_ok; | |
6d8c4e3b DH |
1237 | } |
1238 | ||
1239 | /* An ELF note in memory */ | |
1240 | struct memelfnote | |
1241 | { | |
1242 | const char *name; | |
1243 | int type; | |
1244 | unsigned int datasz; | |
1245 | void *data; | |
1246 | }; | |
1247 | ||
1248 | static int notesize(struct memelfnote *en) | |
1249 | { | |
1250 | int sz; | |
1251 | ||
1252 | sz = sizeof(struct elf_note); | |
1253 | sz += roundup(strlen(en->name) + 1, 4); | |
1254 | sz += roundup(en->datasz, 4); | |
1255 | ||
1256 | return sz; | |
1257 | } | |
1258 | ||
1259 | /* #define DEBUG */ | |
1260 | ||
1261 | #define DUMP_WRITE(addr, nr) \ | |
1262 | do { if (!dump_write(file, (addr), (nr))) return 0; } while(0) | |
1263 | #define DUMP_SEEK(off) \ | |
1264 | do { if (!dump_seek(file, (off))) return 0; } while(0) | |
1265 | ||
1266 | static int writenote(struct memelfnote *men, struct file *file) | |
1267 | { | |
1268 | struct elf_note en; | |
1269 | ||
1270 | en.n_namesz = strlen(men->name) + 1; | |
1271 | en.n_descsz = men->datasz; | |
1272 | en.n_type = men->type; | |
1273 | ||
1274 | DUMP_WRITE(&en, sizeof(en)); | |
1275 | DUMP_WRITE(men->name, en.n_namesz); | |
1276 | /* XXX - cast from long long to long to avoid need for libgcc.a */ | |
1277 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ | |
1278 | DUMP_WRITE(men->data, men->datasz); | |
1279 | DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */ | |
1280 | ||
1281 | return 1; | |
1282 | } | |
1283 | #undef DUMP_WRITE | |
1284 | #undef DUMP_SEEK | |
1285 | ||
1286 | #define DUMP_WRITE(addr, nr) \ | |
1287 | if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \ | |
1288 | goto end_coredump; | |
1289 | #define DUMP_SEEK(off) \ | |
1290 | if (!dump_seek(file, (off))) \ | |
1291 | goto end_coredump; | |
1292 | ||
1293 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) | |
1294 | { | |
1295 | memcpy(elf->e_ident, ELFMAG, SELFMAG); | |
1296 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1297 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1298 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1299 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1300 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); | |
1301 | ||
1302 | elf->e_type = ET_CORE; | |
1303 | elf->e_machine = ELF_ARCH; | |
1304 | elf->e_version = EV_CURRENT; | |
1305 | elf->e_entry = 0; | |
1306 | elf->e_phoff = sizeof(struct elfhdr); | |
1307 | elf->e_shoff = 0; | |
1308 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS; | |
1309 | elf->e_ehsize = sizeof(struct elfhdr); | |
1310 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1311 | elf->e_phnum = segs; | |
1312 | elf->e_shentsize = 0; | |
1313 | elf->e_shnum = 0; | |
1314 | elf->e_shstrndx = 0; | |
1315 | return; | |
1316 | } | |
1317 | ||
1318 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) | |
1319 | { | |
1320 | phdr->p_type = PT_NOTE; | |
1321 | phdr->p_offset = offset; | |
1322 | phdr->p_vaddr = 0; | |
1323 | phdr->p_paddr = 0; | |
1324 | phdr->p_filesz = sz; | |
1325 | phdr->p_memsz = 0; | |
1326 | phdr->p_flags = 0; | |
1327 | phdr->p_align = 0; | |
1328 | return; | |
1329 | } | |
1330 | ||
1331 | static inline void fill_note(struct memelfnote *note, const char *name, int type, | |
1332 | unsigned int sz, void *data) | |
1333 | { | |
1334 | note->name = name; | |
1335 | note->type = type; | |
1336 | note->datasz = sz; | |
1337 | note->data = data; | |
1338 | return; | |
1339 | } | |
1340 | ||
1341 | /* | |
1342 | * fill up all the fields in prstatus from the given task struct, except | |
1343 | * registers which need to be filled up seperately. | |
1344 | */ | |
1345 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
1346 | struct task_struct *p, long signr) | |
1347 | { | |
1348 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1349 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1350 | prstatus->pr_sighold = p->blocked.sig[0]; | |
b488893a PE |
1351 | prstatus->pr_pid = task_pid_vnr(p); |
1352 | prstatus->pr_ppid = task_pid_vnr(p->parent); | |
1353 | prstatus->pr_pgrp = task_pgrp_vnr(p); | |
1354 | prstatus->pr_sid = task_session_vnr(p); | |
6d8c4e3b DH |
1355 | if (thread_group_leader(p)) { |
1356 | /* | |
1357 | * This is the record for the group leader. Add in the | |
1358 | * cumulative times of previous dead threads. This total | |
1359 | * won't include the time of each live thread whose state | |
1360 | * is included in the core dump. The final total reported | |
1361 | * to our parent process when it calls wait4 will include | |
1362 | * those sums as well as the little bit more time it takes | |
1363 | * this and each other thread to finish dying after the | |
1364 | * core dump synchronization phase. | |
1365 | */ | |
1366 | cputime_to_timeval(cputime_add(p->utime, p->signal->utime), | |
1367 | &prstatus->pr_utime); | |
1368 | cputime_to_timeval(cputime_add(p->stime, p->signal->stime), | |
1369 | &prstatus->pr_stime); | |
1370 | } else { | |
1371 | cputime_to_timeval(p->utime, &prstatus->pr_utime); | |
1372 | cputime_to_timeval(p->stime, &prstatus->pr_stime); | |
1373 | } | |
1374 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); | |
1375 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); | |
1376 | ||
1377 | prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; | |
1378 | prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; | |
1379 | } | |
1380 | ||
1381 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1382 | struct mm_struct *mm) | |
1383 | { | |
1384 | unsigned int i, len; | |
1385 | ||
1386 | /* first copy the parameters from user space */ | |
1387 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1388 | ||
1389 | len = mm->arg_end - mm->arg_start; | |
1390 | if (len >= ELF_PRARGSZ) | |
1391 | len = ELF_PRARGSZ - 1; | |
1392 | if (copy_from_user(&psinfo->pr_psargs, | |
1393 | (const char __user *) mm->arg_start, len)) | |
1394 | return -EFAULT; | |
1395 | for (i = 0; i < len; i++) | |
1396 | if (psinfo->pr_psargs[i] == 0) | |
1397 | psinfo->pr_psargs[i] = ' '; | |
1398 | psinfo->pr_psargs[len] = 0; | |
1399 | ||
b488893a PE |
1400 | psinfo->pr_pid = task_pid_vnr(p); |
1401 | psinfo->pr_ppid = task_pid_vnr(p->parent); | |
1402 | psinfo->pr_pgrp = task_pgrp_vnr(p); | |
1403 | psinfo->pr_sid = task_session_vnr(p); | |
6d8c4e3b DH |
1404 | |
1405 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1406 | psinfo->pr_state = i; | |
1407 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; | |
1408 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; | |
1409 | psinfo->pr_nice = task_nice(p); | |
1410 | psinfo->pr_flag = p->flags; | |
1411 | SET_UID(psinfo->pr_uid, p->uid); | |
1412 | SET_GID(psinfo->pr_gid, p->gid); | |
1413 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); | |
1414 | ||
1415 | return 0; | |
1416 | } | |
1417 | ||
1418 | /* Here is the structure in which status of each thread is captured. */ | |
1419 | struct elf_thread_status | |
1420 | { | |
1421 | struct list_head list; | |
1422 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1423 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1424 | struct task_struct *thread; | |
1425 | #ifdef ELF_CORE_COPY_XFPREGS | |
5b20cd80 | 1426 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
6d8c4e3b DH |
1427 | #endif |
1428 | struct memelfnote notes[3]; | |
1429 | int num_notes; | |
1430 | }; | |
1431 | ||
1432 | /* | |
1433 | * In order to add the specific thread information for the elf file format, | |
1434 | * we need to keep a linked list of every thread's pr_status and then create | |
1435 | * a single section for them in the final core file. | |
1436 | */ | |
1437 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1438 | { | |
1439 | struct task_struct *p = t->thread; | |
1440 | int sz = 0; | |
1441 | ||
1442 | t->num_notes = 0; | |
1443 | ||
1444 | fill_prstatus(&t->prstatus, p, signr); | |
1445 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1446 | ||
1447 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), | |
1448 | &t->prstatus); | |
1449 | t->num_notes++; | |
1450 | sz += notesize(&t->notes[0]); | |
1451 | ||
1452 | t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu); | |
1453 | if (t->prstatus.pr_fpvalid) { | |
1454 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1455 | &t->fpu); | |
1456 | t->num_notes++; | |
1457 | sz += notesize(&t->notes[1]); | |
1458 | } | |
1459 | ||
1460 | #ifdef ELF_CORE_COPY_XFPREGS | |
1461 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
5b20cd80 MN |
1462 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1463 | sizeof(t->xfpu), &t->xfpu); | |
6d8c4e3b DH |
1464 | t->num_notes++; |
1465 | sz += notesize(&t->notes[2]); | |
1466 | } | |
1467 | #endif | |
1468 | return sz; | |
1469 | } | |
1470 | ||
1471 | /* | |
1472 | * dump the segments for an MMU process | |
1473 | */ | |
1474 | #ifdef CONFIG_MMU | |
e2e00906 | 1475 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
ee78b0a6 | 1476 | unsigned long *limit, unsigned long mm_flags) |
6d8c4e3b DH |
1477 | { |
1478 | struct vm_area_struct *vma; | |
1479 | ||
1480 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { | |
1481 | unsigned long addr; | |
1482 | ||
ee78b0a6 | 1483 | if (!maydump(vma, mm_flags)) |
6d8c4e3b DH |
1484 | continue; |
1485 | ||
1486 | for (addr = vma->vm_start; | |
1487 | addr < vma->vm_end; | |
1488 | addr += PAGE_SIZE | |
1489 | ) { | |
1490 | struct vm_area_struct *vma; | |
1491 | struct page *page; | |
1492 | ||
1493 | if (get_user_pages(current, current->mm, addr, 1, 0, 1, | |
1494 | &page, &vma) <= 0) { | |
1495 | DUMP_SEEK(file->f_pos + PAGE_SIZE); | |
1496 | } | |
557ed1fa | 1497 | else if (page == ZERO_PAGE(0)) { |
6d8c4e3b | 1498 | page_cache_release(page); |
03221702 | 1499 | DUMP_SEEK(file->f_pos + PAGE_SIZE); |
6d8c4e3b DH |
1500 | } |
1501 | else { | |
1502 | void *kaddr; | |
1503 | ||
1504 | flush_cache_page(vma, addr, page_to_pfn(page)); | |
1505 | kaddr = kmap(page); | |
1506 | if ((*size += PAGE_SIZE) > *limit || | |
1507 | !dump_write(file, kaddr, PAGE_SIZE) | |
1508 | ) { | |
1509 | kunmap(page); | |
1510 | page_cache_release(page); | |
1511 | return -EIO; | |
1512 | } | |
1513 | kunmap(page); | |
1514 | page_cache_release(page); | |
1515 | } | |
1516 | } | |
1517 | } | |
1518 | ||
1519 | return 0; | |
1520 | ||
1521 | end_coredump: | |
1522 | return -EFBIG; | |
1523 | } | |
1524 | #endif | |
1525 | ||
1526 | /* | |
1527 | * dump the segments for a NOMMU process | |
1528 | */ | |
1529 | #ifndef CONFIG_MMU | |
e2e00906 | 1530 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
ee78b0a6 | 1531 | unsigned long *limit, unsigned long mm_flags) |
6d8c4e3b DH |
1532 | { |
1533 | struct vm_list_struct *vml; | |
1534 | ||
1535 | for (vml = current->mm->context.vmlist; vml; vml = vml->next) { | |
1536 | struct vm_area_struct *vma = vml->vma; | |
1537 | ||
ee78b0a6 | 1538 | if (!maydump(vma, mm_flags)) |
6d8c4e3b DH |
1539 | continue; |
1540 | ||
1541 | if ((*size += PAGE_SIZE) > *limit) | |
1542 | return -EFBIG; | |
1543 | ||
1544 | if (!dump_write(file, (void *) vma->vm_start, | |
1545 | vma->vm_end - vma->vm_start)) | |
1546 | return -EIO; | |
1547 | } | |
1548 | ||
1549 | return 0; | |
1550 | } | |
1551 | #endif | |
1552 | ||
1553 | /* | |
1554 | * Actual dumper | |
1555 | * | |
1556 | * This is a two-pass process; first we find the offsets of the bits, | |
1557 | * and then they are actually written out. If we run out of core limit | |
1558 | * we just truncate. | |
1559 | */ | |
1560 | static int elf_fdpic_core_dump(long signr, struct pt_regs *regs, | |
7dc0b22e | 1561 | struct file *file, unsigned long limit) |
6d8c4e3b DH |
1562 | { |
1563 | #define NUM_NOTES 6 | |
1564 | int has_dumped = 0; | |
1565 | mm_segment_t fs; | |
1566 | int segs; | |
1567 | size_t size = 0; | |
1568 | int i; | |
1569 | struct vm_area_struct *vma; | |
1570 | struct elfhdr *elf = NULL; | |
1571 | loff_t offset = 0, dataoff; | |
6d8c4e3b DH |
1572 | int numnote; |
1573 | struct memelfnote *notes = NULL; | |
1574 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ | |
1575 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ | |
1576 | struct task_struct *g, *p; | |
1577 | LIST_HEAD(thread_list); | |
1578 | struct list_head *t; | |
1579 | elf_fpregset_t *fpu = NULL; | |
1580 | #ifdef ELF_CORE_COPY_XFPREGS | |
1581 | elf_fpxregset_t *xfpu = NULL; | |
1582 | #endif | |
1583 | int thread_status_size = 0; | |
1584 | #ifndef CONFIG_MMU | |
1585 | struct vm_list_struct *vml; | |
1586 | #endif | |
1587 | elf_addr_t *auxv; | |
ee78b0a6 | 1588 | unsigned long mm_flags; |
6d8c4e3b DH |
1589 | |
1590 | /* | |
1591 | * We no longer stop all VM operations. | |
1592 | * | |
1593 | * This is because those proceses that could possibly change map_count | |
1594 | * or the mmap / vma pages are now blocked in do_exit on current | |
1595 | * finishing this core dump. | |
1596 | * | |
1597 | * Only ptrace can touch these memory addresses, but it doesn't change | |
1598 | * the map_count or the pages allocated. So no possibility of crashing | |
1599 | * exists while dumping the mm->vm_next areas to the core file. | |
1600 | */ | |
1601 | ||
1602 | /* alloc memory for large data structures: too large to be on stack */ | |
1603 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
1604 | if (!elf) | |
1605 | goto cleanup; | |
1606 | prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL); | |
1607 | if (!prstatus) | |
1608 | goto cleanup; | |
1609 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
1610 | if (!psinfo) | |
1611 | goto cleanup; | |
1612 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); | |
1613 | if (!notes) | |
1614 | goto cleanup; | |
1615 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); | |
1616 | if (!fpu) | |
1617 | goto cleanup; | |
1618 | #ifdef ELF_CORE_COPY_XFPREGS | |
1619 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); | |
1620 | if (!xfpu) | |
1621 | goto cleanup; | |
1622 | #endif | |
1623 | ||
1624 | if (signr) { | |
1625 | struct elf_thread_status *tmp; | |
bce9a234 | 1626 | rcu_read_lock(); |
6d8c4e3b DH |
1627 | do_each_thread(g,p) |
1628 | if (current->mm == p->mm && current != p) { | |
1629 | tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC); | |
1630 | if (!tmp) { | |
bce9a234 | 1631 | rcu_read_unlock(); |
6d8c4e3b DH |
1632 | goto cleanup; |
1633 | } | |
6d8c4e3b DH |
1634 | tmp->thread = p; |
1635 | list_add(&tmp->list, &thread_list); | |
1636 | } | |
1637 | while_each_thread(g,p); | |
bce9a234 | 1638 | rcu_read_unlock(); |
6d8c4e3b DH |
1639 | list_for_each(t, &thread_list) { |
1640 | struct elf_thread_status *tmp; | |
1641 | int sz; | |
1642 | ||
1643 | tmp = list_entry(t, struct elf_thread_status, list); | |
1644 | sz = elf_dump_thread_status(signr, tmp); | |
1645 | thread_status_size += sz; | |
1646 | } | |
1647 | } | |
1648 | ||
1649 | /* now collect the dump for the current */ | |
1650 | fill_prstatus(prstatus, current, signr); | |
1651 | elf_core_copy_regs(&prstatus->pr_reg, regs); | |
1652 | ||
1653 | #ifdef CONFIG_MMU | |
1654 | segs = current->mm->map_count; | |
1655 | #else | |
1656 | segs = 0; | |
1657 | for (vml = current->mm->context.vmlist; vml; vml = vml->next) | |
1658 | segs++; | |
1659 | #endif | |
1660 | #ifdef ELF_CORE_EXTRA_PHDRS | |
1661 | segs += ELF_CORE_EXTRA_PHDRS; | |
1662 | #endif | |
1663 | ||
1664 | /* Set up header */ | |
1665 | fill_elf_fdpic_header(elf, segs + 1); /* including notes section */ | |
1666 | ||
1667 | has_dumped = 1; | |
1668 | current->flags |= PF_DUMPCORE; | |
1669 | ||
1670 | /* | |
1671 | * Set up the notes in similar form to SVR4 core dumps made | |
1672 | * with info from their /proc. | |
1673 | */ | |
1674 | ||
1675 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); | |
1676 | fill_psinfo(psinfo, current->group_leader, current->mm); | |
1677 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); | |
1678 | ||
1679 | numnote = 2; | |
1680 | ||
1681 | auxv = (elf_addr_t *) current->mm->saved_auxv; | |
1682 | ||
1683 | i = 0; | |
1684 | do | |
1685 | i += 2; | |
1686 | while (auxv[i - 2] != AT_NULL); | |
1687 | fill_note(¬es[numnote++], "CORE", NT_AUXV, | |
1688 | i * sizeof(elf_addr_t), auxv); | |
1689 | ||
1690 | /* Try to dump the FPU. */ | |
1691 | if ((prstatus->pr_fpvalid = | |
1692 | elf_core_copy_task_fpregs(current, regs, fpu))) | |
1693 | fill_note(notes + numnote++, | |
1694 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); | |
1695 | #ifdef ELF_CORE_COPY_XFPREGS | |
1696 | if (elf_core_copy_task_xfpregs(current, xfpu)) | |
1697 | fill_note(notes + numnote++, | |
5b20cd80 | 1698 | "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu); |
6d8c4e3b DH |
1699 | #endif |
1700 | ||
1701 | fs = get_fs(); | |
1702 | set_fs(KERNEL_DS); | |
1703 | ||
1704 | DUMP_WRITE(elf, sizeof(*elf)); | |
1705 | offset += sizeof(*elf); /* Elf header */ | |
1706 | offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */ | |
1707 | ||
1708 | /* Write notes phdr entry */ | |
1709 | { | |
1710 | struct elf_phdr phdr; | |
1711 | int sz = 0; | |
1712 | ||
1713 | for (i = 0; i < numnote; i++) | |
1714 | sz += notesize(notes + i); | |
1715 | ||
1716 | sz += thread_status_size; | |
1717 | ||
1718 | fill_elf_note_phdr(&phdr, sz, offset); | |
1719 | offset += sz; | |
1720 | DUMP_WRITE(&phdr, sizeof(phdr)); | |
1721 | } | |
1722 | ||
1723 | /* Page-align dumped data */ | |
1724 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); | |
1725 | ||
ee78b0a6 KH |
1726 | /* |
1727 | * We must use the same mm->flags while dumping core to avoid | |
1728 | * inconsistency between the program headers and bodies, otherwise an | |
1729 | * unusable core file can be generated. | |
1730 | */ | |
1731 | mm_flags = current->mm->flags; | |
1732 | ||
6d8c4e3b DH |
1733 | /* write program headers for segments dump */ |
1734 | for ( | |
1735 | #ifdef CONFIG_MMU | |
1736 | vma = current->mm->mmap; vma; vma = vma->vm_next | |
1737 | #else | |
1738 | vml = current->mm->context.vmlist; vml; vml = vml->next | |
1739 | #endif | |
1740 | ) { | |
1741 | struct elf_phdr phdr; | |
1742 | size_t sz; | |
1743 | ||
1744 | #ifndef CONFIG_MMU | |
1745 | vma = vml->vma; | |
1746 | #endif | |
1747 | ||
1748 | sz = vma->vm_end - vma->vm_start; | |
1749 | ||
1750 | phdr.p_type = PT_LOAD; | |
1751 | phdr.p_offset = offset; | |
1752 | phdr.p_vaddr = vma->vm_start; | |
1753 | phdr.p_paddr = 0; | |
ee78b0a6 | 1754 | phdr.p_filesz = maydump(vma, mm_flags) ? sz : 0; |
6d8c4e3b DH |
1755 | phdr.p_memsz = sz; |
1756 | offset += phdr.p_filesz; | |
1757 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
1758 | if (vma->vm_flags & VM_WRITE) | |
1759 | phdr.p_flags |= PF_W; | |
1760 | if (vma->vm_flags & VM_EXEC) | |
1761 | phdr.p_flags |= PF_X; | |
1762 | phdr.p_align = ELF_EXEC_PAGESIZE; | |
1763 | ||
1764 | DUMP_WRITE(&phdr, sizeof(phdr)); | |
1765 | } | |
1766 | ||
1767 | #ifdef ELF_CORE_WRITE_EXTRA_PHDRS | |
1768 | ELF_CORE_WRITE_EXTRA_PHDRS; | |
1769 | #endif | |
1770 | ||
1771 | /* write out the notes section */ | |
1772 | for (i = 0; i < numnote; i++) | |
1773 | if (!writenote(notes + i, file)) | |
1774 | goto end_coredump; | |
1775 | ||
1776 | /* write out the thread status notes section */ | |
1777 | list_for_each(t, &thread_list) { | |
1778 | struct elf_thread_status *tmp = | |
1779 | list_entry(t, struct elf_thread_status, list); | |
1780 | ||
1781 | for (i = 0; i < tmp->num_notes; i++) | |
1782 | if (!writenote(&tmp->notes[i], file)) | |
1783 | goto end_coredump; | |
1784 | } | |
1785 | ||
1786 | DUMP_SEEK(dataoff); | |
1787 | ||
ee78b0a6 | 1788 | if (elf_fdpic_dump_segments(file, &size, &limit, mm_flags) < 0) |
6d8c4e3b DH |
1789 | goto end_coredump; |
1790 | ||
1791 | #ifdef ELF_CORE_WRITE_EXTRA_DATA | |
1792 | ELF_CORE_WRITE_EXTRA_DATA; | |
1793 | #endif | |
1794 | ||
1795 | if (file->f_pos != offset) { | |
1796 | /* Sanity check */ | |
1797 | printk(KERN_WARNING | |
1798 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", | |
1799 | file->f_pos, offset); | |
1800 | } | |
1801 | ||
1802 | end_coredump: | |
1803 | set_fs(fs); | |
1804 | ||
1805 | cleanup: | |
1806 | while (!list_empty(&thread_list)) { | |
1807 | struct list_head *tmp = thread_list.next; | |
1808 | list_del(tmp); | |
1809 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
1810 | } | |
1811 | ||
1812 | kfree(elf); | |
1813 | kfree(prstatus); | |
1814 | kfree(psinfo); | |
1815 | kfree(notes); | |
1816 | kfree(fpu); | |
1817 | #ifdef ELF_CORE_COPY_XFPREGS | |
1818 | kfree(xfpu); | |
1819 | #endif | |
1820 | return has_dumped; | |
1821 | #undef NUM_NOTES | |
1822 | } | |
1823 | ||
1824 | #endif /* USE_ELF_CORE_DUMP */ |