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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> | |
088e7af7 | 37 | #include <linux/coredump.h> |
1da177e4 LT |
38 | |
39 | #include <asm/uaccess.h> | |
40 | #include <asm/param.h> | |
41 | #include <asm/pgalloc.h> | |
42 | ||
43 | typedef char *elf_caddr_t; | |
1da177e4 LT |
44 | |
45 | #if 0 | |
46 | #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) | |
47 | #else | |
48 | #define kdebug(fmt, ...) do {} while(0) | |
49 | #endif | |
50 | ||
6d8c4e3b DH |
51 | #if 0 |
52 | #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ ) | |
53 | #else | |
54 | #define kdcore(fmt, ...) do {} while(0) | |
55 | #endif | |
56 | ||
1da177e4 LT |
57 | MODULE_LICENSE("GPL"); |
58 | ||
8a2ab7f5 DH |
59 | static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *); |
60 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *); | |
61 | static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *, | |
62 | struct mm_struct *, const char *); | |
1da177e4 | 63 | |
8a2ab7f5 DH |
64 | static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *, |
65 | struct elf_fdpic_params *, | |
66 | struct elf_fdpic_params *); | |
1da177e4 LT |
67 | |
68 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
69 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *, |
70 | unsigned long *); | |
71 | static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *, | |
72 | struct file *, | |
73 | struct mm_struct *); | |
1da177e4 LT |
74 | #endif |
75 | ||
8a2ab7f5 DH |
76 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *, |
77 | struct file *, struct mm_struct *); | |
1da177e4 | 78 | |
698ba7b5 | 79 | #ifdef CONFIG_ELF_CORE |
f6151dfe | 80 | static int elf_fdpic_core_dump(struct coredump_params *cprm); |
6d8c4e3b DH |
81 | #endif |
82 | ||
1da177e4 LT |
83 | static struct linux_binfmt elf_fdpic_format = { |
84 | .module = THIS_MODULE, | |
85 | .load_binary = load_elf_fdpic_binary, | |
698ba7b5 | 86 | #ifdef CONFIG_ELF_CORE |
6d8c4e3b DH |
87 | .core_dump = elf_fdpic_core_dump, |
88 | #endif | |
1da177e4 LT |
89 | .min_coredump = ELF_EXEC_PAGESIZE, |
90 | }; | |
91 | ||
8a2ab7f5 DH |
92 | static int __init init_elf_fdpic_binfmt(void) |
93 | { | |
8fc3dc5a AV |
94 | register_binfmt(&elf_fdpic_format); |
95 | return 0; | |
8a2ab7f5 | 96 | } |
1da177e4 | 97 | |
8a2ab7f5 DH |
98 | static void __exit exit_elf_fdpic_binfmt(void) |
99 | { | |
100 | unregister_binfmt(&elf_fdpic_format); | |
101 | } | |
102 | ||
6d8c4e3b | 103 | core_initcall(init_elf_fdpic_binfmt); |
8a2ab7f5 | 104 | module_exit(exit_elf_fdpic_binfmt); |
1da177e4 LT |
105 | |
106 | static int is_elf_fdpic(struct elfhdr *hdr, struct file *file) | |
107 | { | |
108 | if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0) | |
109 | return 0; | |
110 | if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN) | |
111 | return 0; | |
112 | if (!elf_check_arch(hdr) || !elf_check_fdpic(hdr)) | |
113 | return 0; | |
114 | if (!file->f_op || !file->f_op->mmap) | |
115 | return 0; | |
116 | return 1; | |
117 | } | |
118 | ||
119 | /*****************************************************************************/ | |
120 | /* | |
121 | * read the program headers table into memory | |
122 | */ | |
8a2ab7f5 DH |
123 | static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, |
124 | struct file *file) | |
1da177e4 LT |
125 | { |
126 | struct elf32_phdr *phdr; | |
127 | unsigned long size; | |
128 | int retval, loop; | |
129 | ||
130 | if (params->hdr.e_phentsize != sizeof(struct elf_phdr)) | |
131 | return -ENOMEM; | |
132 | if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr)) | |
133 | return -ENOMEM; | |
134 | ||
135 | size = params->hdr.e_phnum * sizeof(struct elf_phdr); | |
136 | params->phdrs = kmalloc(size, GFP_KERNEL); | |
137 | if (!params->phdrs) | |
138 | return -ENOMEM; | |
139 | ||
8a2ab7f5 DH |
140 | retval = kernel_read(file, params->hdr.e_phoff, |
141 | (char *) params->phdrs, size); | |
e1d2c8b6 DH |
142 | if (unlikely(retval != size)) |
143 | return retval < 0 ? retval : -ENOEXEC; | |
1da177e4 LT |
144 | |
145 | /* determine stack size for this binary */ | |
146 | phdr = params->phdrs; | |
147 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
148 | if (phdr->p_type != PT_GNU_STACK) | |
149 | continue; | |
150 | ||
151 | if (phdr->p_flags & PF_X) | |
152 | params->flags |= ELF_FDPIC_FLAG_EXEC_STACK; | |
153 | else | |
154 | params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK; | |
155 | ||
156 | params->stack_size = phdr->p_memsz; | |
157 | break; | |
158 | } | |
159 | ||
160 | return 0; | |
8a2ab7f5 | 161 | } |
1da177e4 LT |
162 | |
163 | /*****************************************************************************/ | |
164 | /* | |
165 | * load an fdpic binary into various bits of memory | |
166 | */ | |
8a2ab7f5 DH |
167 | static int load_elf_fdpic_binary(struct linux_binprm *bprm, |
168 | struct pt_regs *regs) | |
1da177e4 LT |
169 | { |
170 | struct elf_fdpic_params exec_params, interp_params; | |
171 | struct elf_phdr *phdr; | |
8a2ab7f5 | 172 | unsigned long stack_size, entryaddr; |
8a2ab7f5 DH |
173 | #ifdef ELF_FDPIC_PLAT_INIT |
174 | unsigned long dynaddr; | |
04e4f2b1 MF |
175 | #endif |
176 | #ifndef CONFIG_MMU | |
177 | unsigned long stack_prot; | |
8a2ab7f5 | 178 | #endif |
1da177e4 LT |
179 | struct file *interpreter = NULL; /* to shut gcc up */ |
180 | char *interpreter_name = NULL; | |
181 | int executable_stack; | |
182 | int retval, i; | |
183 | ||
aa289b47 DH |
184 | kdebug("____ LOAD %d ____", current->pid); |
185 | ||
1da177e4 LT |
186 | memset(&exec_params, 0, sizeof(exec_params)); |
187 | memset(&interp_params, 0, sizeof(interp_params)); | |
188 | ||
189 | exec_params.hdr = *(struct elfhdr *) bprm->buf; | |
190 | exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE; | |
191 | ||
192 | /* check that this is a binary we know how to deal with */ | |
193 | retval = -ENOEXEC; | |
194 | if (!is_elf_fdpic(&exec_params.hdr, bprm->file)) | |
195 | goto error; | |
196 | ||
197 | /* read the program header table */ | |
198 | retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file); | |
199 | if (retval < 0) | |
200 | goto error; | |
201 | ||
202 | /* scan for a program header that specifies an interpreter */ | |
203 | phdr = exec_params.phdrs; | |
204 | ||
205 | for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) { | |
206 | switch (phdr->p_type) { | |
207 | case PT_INTERP: | |
208 | retval = -ENOMEM; | |
209 | if (phdr->p_filesz > PATH_MAX) | |
210 | goto error; | |
211 | retval = -ENOENT; | |
212 | if (phdr->p_filesz < 2) | |
213 | goto error; | |
214 | ||
215 | /* read the name of the interpreter into memory */ | |
792db3af | 216 | interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL); |
1da177e4 LT |
217 | if (!interpreter_name) |
218 | goto error; | |
219 | ||
220 | retval = kernel_read(bprm->file, | |
221 | phdr->p_offset, | |
222 | interpreter_name, | |
223 | phdr->p_filesz); | |
e1d2c8b6 DH |
224 | if (unlikely(retval != phdr->p_filesz)) { |
225 | if (retval >= 0) | |
226 | retval = -ENOEXEC; | |
1da177e4 | 227 | goto error; |
e1d2c8b6 | 228 | } |
1da177e4 LT |
229 | |
230 | retval = -ENOENT; | |
231 | if (interpreter_name[phdr->p_filesz - 1] != '\0') | |
232 | goto error; | |
233 | ||
234 | kdebug("Using ELF interpreter %s", interpreter_name); | |
235 | ||
236 | /* replace the program with the interpreter */ | |
237 | interpreter = open_exec(interpreter_name); | |
238 | retval = PTR_ERR(interpreter); | |
239 | if (IS_ERR(interpreter)) { | |
240 | interpreter = NULL; | |
241 | goto error; | |
242 | } | |
243 | ||
1fb84496 AD |
244 | /* |
245 | * If the binary is not readable then enforce | |
246 | * mm->dumpable = 0 regardless of the interpreter's | |
247 | * permissions. | |
248 | */ | |
1b5d783c | 249 | would_dump(bprm, interpreter); |
1fb84496 | 250 | |
8a2ab7f5 DH |
251 | retval = kernel_read(interpreter, 0, bprm->buf, |
252 | BINPRM_BUF_SIZE); | |
e1d2c8b6 DH |
253 | if (unlikely(retval != BINPRM_BUF_SIZE)) { |
254 | if (retval >= 0) | |
255 | retval = -ENOEXEC; | |
1da177e4 | 256 | goto error; |
e1d2c8b6 | 257 | } |
1da177e4 LT |
258 | |
259 | interp_params.hdr = *((struct elfhdr *) bprm->buf); | |
260 | break; | |
261 | ||
262 | case PT_LOAD: | |
263 | #ifdef CONFIG_MMU | |
264 | if (exec_params.load_addr == 0) | |
265 | exec_params.load_addr = phdr->p_vaddr; | |
266 | #endif | |
267 | break; | |
268 | } | |
269 | ||
270 | } | |
271 | ||
272 | if (elf_check_const_displacement(&exec_params.hdr)) | |
273 | exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; | |
274 | ||
275 | /* perform insanity checks on the interpreter */ | |
276 | if (interpreter_name) { | |
277 | retval = -ELIBBAD; | |
278 | if (!is_elf_fdpic(&interp_params.hdr, interpreter)) | |
279 | goto error; | |
280 | ||
281 | interp_params.flags = ELF_FDPIC_FLAG_PRESENT; | |
282 | ||
283 | /* read the interpreter's program header table */ | |
284 | retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter); | |
285 | if (retval < 0) | |
286 | goto error; | |
287 | } | |
288 | ||
289 | stack_size = exec_params.stack_size; | |
1da177e4 LT |
290 | if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) |
291 | executable_stack = EXSTACK_ENABLE_X; | |
292 | else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) | |
293 | executable_stack = EXSTACK_DISABLE_X; | |
1da177e4 LT |
294 | else |
295 | executable_stack = EXSTACK_DEFAULT; | |
296 | ||
8e8b63a6 DH |
297 | if (stack_size == 0) { |
298 | stack_size = interp_params.stack_size; | |
299 | if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK) | |
300 | executable_stack = EXSTACK_ENABLE_X; | |
301 | else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK) | |
302 | executable_stack = EXSTACK_DISABLE_X; | |
303 | else | |
304 | executable_stack = EXSTACK_DEFAULT; | |
305 | } | |
306 | ||
1da177e4 LT |
307 | retval = -ENOEXEC; |
308 | if (stack_size == 0) | |
309 | goto error; | |
310 | ||
311 | if (elf_check_const_displacement(&interp_params.hdr)) | |
312 | interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP; | |
313 | ||
314 | /* flush all traces of the currently running executable */ | |
315 | retval = flush_old_exec(bprm); | |
316 | if (retval) | |
317 | goto error; | |
318 | ||
319 | /* there's now no turning back... the old userspace image is dead, | |
320 | * defunct, deceased, etc. after this point we have to exit via | |
321 | * error_kill */ | |
322 | set_personality(PER_LINUX_FDPIC); | |
04e4f2b1 MF |
323 | if (elf_read_implies_exec(&exec_params.hdr, executable_stack)) |
324 | current->personality |= READ_IMPLIES_EXEC; | |
221af7f8 LT |
325 | |
326 | setup_new_exec(bprm); | |
327 | ||
1da177e4 LT |
328 | set_binfmt(&elf_fdpic_format); |
329 | ||
330 | current->mm->start_code = 0; | |
331 | current->mm->end_code = 0; | |
332 | current->mm->start_stack = 0; | |
333 | current->mm->start_data = 0; | |
334 | current->mm->end_data = 0; | |
335 | current->mm->context.exec_fdpic_loadmap = 0; | |
336 | current->mm->context.interp_fdpic_loadmap = 0; | |
337 | ||
1da177e4 LT |
338 | #ifdef CONFIG_MMU |
339 | elf_fdpic_arch_lay_out_mm(&exec_params, | |
340 | &interp_params, | |
341 | ¤t->mm->start_stack, | |
342 | ¤t->mm->start_brk); | |
1da177e4 | 343 | |
8a2ab7f5 DH |
344 | retval = setup_arg_pages(bprm, current->mm->start_stack, |
345 | executable_stack); | |
1da177e4 LT |
346 | if (retval < 0) { |
347 | send_sig(SIGKILL, current, 0); | |
348 | goto error_kill; | |
349 | } | |
350 | #endif | |
351 | ||
352 | /* load the executable and interpreter into memory */ | |
8a2ab7f5 DH |
353 | retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, |
354 | "executable"); | |
1da177e4 LT |
355 | if (retval < 0) |
356 | goto error_kill; | |
357 | ||
358 | if (interpreter_name) { | |
359 | retval = elf_fdpic_map_file(&interp_params, interpreter, | |
360 | current->mm, "interpreter"); | |
361 | if (retval < 0) { | |
362 | printk(KERN_ERR "Unable to load interpreter\n"); | |
363 | goto error_kill; | |
364 | } | |
365 | ||
366 | allow_write_access(interpreter); | |
367 | fput(interpreter); | |
368 | interpreter = NULL; | |
369 | } | |
370 | ||
371 | #ifdef CONFIG_MMU | |
372 | if (!current->mm->start_brk) | |
373 | current->mm->start_brk = current->mm->end_data; | |
374 | ||
8a2ab7f5 DH |
375 | current->mm->brk = current->mm->start_brk = |
376 | PAGE_ALIGN(current->mm->start_brk); | |
1da177e4 LT |
377 | |
378 | #else | |
379 | /* create a stack and brk area big enough for everyone | |
380 | * - the brk heap starts at the bottom and works up | |
381 | * - the stack starts at the top and works down | |
382 | */ | |
383 | stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK; | |
384 | if (stack_size < PAGE_SIZE * 2) | |
385 | stack_size = PAGE_SIZE * 2; | |
386 | ||
04e4f2b1 MF |
387 | stack_prot = PROT_READ | PROT_WRITE; |
388 | if (executable_stack == EXSTACK_ENABLE_X || | |
389 | (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC)) | |
390 | stack_prot |= PROT_EXEC; | |
391 | ||
1da177e4 | 392 | down_write(¤t->mm->mmap_sem); |
04e4f2b1 | 393 | current->mm->start_brk = do_mmap(NULL, 0, stack_size, stack_prot, |
ea637639 JZ |
394 | MAP_PRIVATE | MAP_ANONYMOUS | |
395 | MAP_UNINITIALIZED | MAP_GROWSDOWN, | |
1da177e4 LT |
396 | 0); |
397 | ||
8a2ab7f5 | 398 | if (IS_ERR_VALUE(current->mm->start_brk)) { |
1da177e4 LT |
399 | up_write(¤t->mm->mmap_sem); |
400 | retval = current->mm->start_brk; | |
401 | current->mm->start_brk = 0; | |
402 | goto error_kill; | |
403 | } | |
404 | ||
1da177e4 LT |
405 | up_write(¤t->mm->mmap_sem); |
406 | ||
407 | current->mm->brk = current->mm->start_brk; | |
408 | current->mm->context.end_brk = current->mm->start_brk; | |
8a2ab7f5 DH |
409 | current->mm->context.end_brk += |
410 | (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0; | |
1da177e4 LT |
411 | current->mm->start_stack = current->mm->start_brk + stack_size; |
412 | #endif | |
413 | ||
a6f76f23 | 414 | install_exec_creds(bprm); |
8a2ab7f5 DH |
415 | if (create_elf_fdpic_tables(bprm, current->mm, |
416 | &exec_params, &interp_params) < 0) | |
1da177e4 LT |
417 | goto error_kill; |
418 | ||
8a2ab7f5 DH |
419 | kdebug("- start_code %lx", current->mm->start_code); |
420 | kdebug("- end_code %lx", current->mm->end_code); | |
421 | kdebug("- start_data %lx", current->mm->start_data); | |
422 | kdebug("- end_data %lx", current->mm->end_data); | |
423 | kdebug("- start_brk %lx", current->mm->start_brk); | |
424 | kdebug("- brk %lx", current->mm->brk); | |
425 | kdebug("- start_stack %lx", current->mm->start_stack); | |
1da177e4 LT |
426 | |
427 | #ifdef ELF_FDPIC_PLAT_INIT | |
428 | /* | |
429 | * The ABI may specify that certain registers be set up in special | |
430 | * ways (on i386 %edx is the address of a DT_FINI function, for | |
431 | * example. This macro performs whatever initialization to | |
432 | * the regs structure is required. | |
433 | */ | |
8a2ab7f5 DH |
434 | dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr; |
435 | ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr, | |
436 | dynaddr); | |
1da177e4 LT |
437 | #endif |
438 | ||
439 | /* everything is now ready... get the userspace context ready to roll */ | |
8a2ab7f5 DH |
440 | entryaddr = interp_params.entry_addr ?: exec_params.entry_addr; |
441 | start_thread(regs, entryaddr, current->mm->start_stack); | |
1da177e4 | 442 | |
1da177e4 LT |
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 | /*****************************************************************************/ | |
ec23847d PM |
465 | |
466 | #ifndef ELF_BASE_PLATFORM | |
467 | /* | |
468 | * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture. | |
469 | * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value | |
470 | * will be copied to the user stack in the same manner as AT_PLATFORM. | |
471 | */ | |
472 | #define ELF_BASE_PLATFORM NULL | |
473 | #endif | |
474 | ||
1da177e4 | 475 | /* |
c7637941 PM |
476 | * present useful information to the program by shovelling it onto the new |
477 | * process's stack | |
1da177e4 LT |
478 | */ |
479 | static int create_elf_fdpic_tables(struct linux_binprm *bprm, | |
480 | struct mm_struct *mm, | |
481 | struct elf_fdpic_params *exec_params, | |
482 | struct elf_fdpic_params *interp_params) | |
483 | { | |
86a264ab | 484 | const struct cred *cred = current_cred(); |
1da177e4 | 485 | unsigned long sp, csp, nitems; |
530018bf | 486 | elf_caddr_t __user *argv, *envp; |
1da177e4 | 487 | size_t platform_len = 0, len; |
ec23847d PM |
488 | char *k_platform, *k_base_platform; |
489 | char __user *u_platform, *u_base_platform, *p; | |
1da177e4 LT |
490 | long hwcap; |
491 | int loop; | |
9b14ec35 | 492 | int nr; /* reset for each csp adjustment */ |
1da177e4 | 493 | |
1da177e4 | 494 | #ifdef CONFIG_MMU |
c7637941 PM |
495 | /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions |
496 | * by the processes running on the same package. One thing we can do is | |
497 | * to shuffle the initial stack for them, so we give the architecture | |
498 | * an opportunity to do so here. | |
499 | */ | |
500 | sp = arch_align_stack(bprm->p); | |
1da177e4 LT |
501 | #else |
502 | sp = mm->start_stack; | |
503 | ||
504 | /* stack the program arguments and environment */ | |
505 | if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0) | |
506 | return -EFAULT; | |
507 | #endif | |
508 | ||
1da177e4 | 509 | hwcap = ELF_HWCAP; |
ec23847d PM |
510 | |
511 | /* | |
512 | * If this architecture has a platform capability string, copy it | |
513 | * to userspace. In some cases (Sparc), this info is impossible | |
514 | * for userspace to get any other way, in others (i386) it is | |
515 | * merely difficult. | |
516 | */ | |
1da177e4 | 517 | k_platform = ELF_PLATFORM; |
1aeb21d6 | 518 | u_platform = NULL; |
1da177e4 LT |
519 | |
520 | if (k_platform) { | |
521 | platform_len = strlen(k_platform) + 1; | |
522 | sp -= platform_len; | |
530018bf | 523 | u_platform = (char __user *) sp; |
1da177e4 LT |
524 | if (__copy_to_user(u_platform, k_platform, platform_len) != 0) |
525 | return -EFAULT; | |
526 | } | |
527 | ||
ec23847d PM |
528 | /* |
529 | * If this architecture has a "base" platform capability | |
530 | * string, copy it to userspace. | |
531 | */ | |
532 | k_base_platform = ELF_BASE_PLATFORM; | |
533 | u_base_platform = NULL; | |
534 | ||
535 | if (k_base_platform) { | |
536 | platform_len = strlen(k_base_platform) + 1; | |
537 | sp -= platform_len; | |
538 | u_base_platform = (char __user *) sp; | |
539 | if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0) | |
540 | return -EFAULT; | |
541 | } | |
542 | ||
1da177e4 LT |
543 | sp &= ~7UL; |
544 | ||
545 | /* stack the load map(s) */ | |
546 | len = sizeof(struct elf32_fdpic_loadmap); | |
547 | len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs; | |
548 | sp = (sp - len) & ~7UL; | |
549 | exec_params->map_addr = sp; | |
550 | ||
530018bf | 551 | if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0) |
1da177e4 LT |
552 | return -EFAULT; |
553 | ||
554 | current->mm->context.exec_fdpic_loadmap = (unsigned long) sp; | |
555 | ||
556 | if (interp_params->loadmap) { | |
557 | len = sizeof(struct elf32_fdpic_loadmap); | |
8a2ab7f5 DH |
558 | len += sizeof(struct elf32_fdpic_loadseg) * |
559 | interp_params->loadmap->nsegs; | |
1da177e4 LT |
560 | sp = (sp - len) & ~7UL; |
561 | interp_params->map_addr = sp; | |
562 | ||
8a2ab7f5 DH |
563 | if (copy_to_user((void __user *) sp, interp_params->loadmap, |
564 | len) != 0) | |
1da177e4 LT |
565 | return -EFAULT; |
566 | ||
567 | current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; | |
568 | } | |
569 | ||
570 | /* force 16 byte _final_ alignment here for generality */ | |
5edc2a51 | 571 | #define DLINFO_ITEMS 15 |
1da177e4 | 572 | |
ec23847d PM |
573 | nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) + |
574 | (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH; | |
1da177e4 | 575 | |
5edc2a51 PM |
576 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) |
577 | nitems++; | |
578 | ||
1da177e4 LT |
579 | csp = sp; |
580 | sp -= nitems * 2 * sizeof(unsigned long); | |
581 | sp -= (bprm->envc + 1) * sizeof(char *); /* envv[] */ | |
582 | sp -= (bprm->argc + 1) * sizeof(char *); /* argv[] */ | |
583 | sp -= 1 * sizeof(unsigned long); /* argc */ | |
584 | ||
585 | csp -= sp & 15UL; | |
586 | sp -= sp & 15UL; | |
587 | ||
588 | /* put the ELF interpreter info on the stack */ | |
9b14ec35 | 589 | #define NEW_AUX_ENT(id, val) \ |
8a2ab7f5 DH |
590 | do { \ |
591 | struct { unsigned long _id, _val; } __user *ent; \ | |
592 | \ | |
593 | ent = (void __user *) csp; \ | |
594 | __put_user((id), &ent[nr]._id); \ | |
595 | __put_user((val), &ent[nr]._val); \ | |
9b14ec35 | 596 | nr++; \ |
1da177e4 LT |
597 | } while (0) |
598 | ||
9b14ec35 | 599 | nr = 0; |
1da177e4 | 600 | csp -= 2 * sizeof(unsigned long); |
9b14ec35 | 601 | NEW_AUX_ENT(AT_NULL, 0); |
1da177e4 | 602 | if (k_platform) { |
9b14ec35 | 603 | nr = 0; |
1da177e4 | 604 | csp -= 2 * sizeof(unsigned long); |
9b14ec35 | 605 | NEW_AUX_ENT(AT_PLATFORM, |
8a2ab7f5 | 606 | (elf_addr_t) (unsigned long) u_platform); |
1da177e4 LT |
607 | } |
608 | ||
ec23847d PM |
609 | if (k_base_platform) { |
610 | nr = 0; | |
611 | csp -= 2 * sizeof(unsigned long); | |
612 | NEW_AUX_ENT(AT_BASE_PLATFORM, | |
613 | (elf_addr_t) (unsigned long) u_base_platform); | |
614 | } | |
615 | ||
5edc2a51 PM |
616 | if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) { |
617 | nr = 0; | |
618 | csp -= 2 * sizeof(unsigned long); | |
619 | NEW_AUX_ENT(AT_EXECFD, bprm->interp_data); | |
620 | } | |
621 | ||
9b14ec35 | 622 | nr = 0; |
1da177e4 | 623 | csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); |
9b14ec35 PM |
624 | NEW_AUX_ENT(AT_HWCAP, hwcap); |
625 | NEW_AUX_ENT(AT_PAGESZ, PAGE_SIZE); | |
626 | NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC); | |
627 | NEW_AUX_ENT(AT_PHDR, exec_params->ph_addr); | |
628 | NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr)); | |
629 | NEW_AUX_ENT(AT_PHNUM, exec_params->hdr.e_phnum); | |
630 | NEW_AUX_ENT(AT_BASE, interp_params->elfhdr_addr); | |
631 | NEW_AUX_ENT(AT_FLAGS, 0); | |
632 | NEW_AUX_ENT(AT_ENTRY, exec_params->entry_addr); | |
86a264ab DH |
633 | NEW_AUX_ENT(AT_UID, (elf_addr_t) cred->uid); |
634 | NEW_AUX_ENT(AT_EUID, (elf_addr_t) cred->euid); | |
635 | NEW_AUX_ENT(AT_GID, (elf_addr_t) cred->gid); | |
636 | NEW_AUX_ENT(AT_EGID, (elf_addr_t) cred->egid); | |
5edc2a51 PM |
637 | NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm)); |
638 | NEW_AUX_ENT(AT_EXECFN, bprm->exec); | |
1da177e4 LT |
639 | |
640 | #ifdef ARCH_DLINFO | |
9b14ec35 PM |
641 | nr = 0; |
642 | csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long); | |
643 | ||
1da177e4 LT |
644 | /* ARCH_DLINFO must come last so platform specific code can enforce |
645 | * special alignment requirements on the AUXV if necessary (eg. PPC). | |
646 | */ | |
647 | ARCH_DLINFO; | |
648 | #endif | |
649 | #undef NEW_AUX_ENT | |
650 | ||
651 | /* allocate room for argv[] and envv[] */ | |
652 | csp -= (bprm->envc + 1) * sizeof(elf_caddr_t); | |
530018bf | 653 | envp = (elf_caddr_t __user *) csp; |
1da177e4 | 654 | csp -= (bprm->argc + 1) * sizeof(elf_caddr_t); |
530018bf | 655 | argv = (elf_caddr_t __user *) csp; |
1da177e4 LT |
656 | |
657 | /* stack argc */ | |
658 | csp -= sizeof(unsigned long); | |
530018bf | 659 | __put_user(bprm->argc, (unsigned long __user *) csp); |
1da177e4 | 660 | |
88bcd512 | 661 | BUG_ON(csp != sp); |
1da177e4 LT |
662 | |
663 | /* fill in the argv[] array */ | |
664 | #ifdef CONFIG_MMU | |
665 | current->mm->arg_start = bprm->p; | |
666 | #else | |
8a2ab7f5 DH |
667 | current->mm->arg_start = current->mm->start_stack - |
668 | (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); | |
1da177e4 LT |
669 | #endif |
670 | ||
530018bf | 671 | p = (char __user *) current->mm->arg_start; |
1da177e4 LT |
672 | for (loop = bprm->argc; loop > 0; loop--) { |
673 | __put_user((elf_caddr_t) p, argv++); | |
b6a2fea3 OW |
674 | len = strnlen_user(p, MAX_ARG_STRLEN); |
675 | if (!len || len > MAX_ARG_STRLEN) | |
1da177e4 LT |
676 | return -EINVAL; |
677 | p += len; | |
678 | } | |
679 | __put_user(NULL, argv); | |
680 | current->mm->arg_end = (unsigned long) p; | |
681 | ||
682 | /* fill in the envv[] array */ | |
683 | current->mm->env_start = (unsigned long) p; | |
684 | for (loop = bprm->envc; loop > 0; loop--) { | |
685 | __put_user((elf_caddr_t)(unsigned long) p, envp++); | |
b6a2fea3 OW |
686 | len = strnlen_user(p, MAX_ARG_STRLEN); |
687 | if (!len || len > MAX_ARG_STRLEN) | |
1da177e4 LT |
688 | return -EINVAL; |
689 | p += len; | |
690 | } | |
691 | __put_user(NULL, envp); | |
692 | current->mm->env_end = (unsigned long) p; | |
693 | ||
694 | mm->start_stack = (unsigned long) sp; | |
695 | return 0; | |
8a2ab7f5 | 696 | } |
1da177e4 LT |
697 | |
698 | /*****************************************************************************/ | |
699 | /* | |
700 | * transfer the program arguments and environment from the holding pages onto | |
701 | * the stack | |
702 | */ | |
703 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
704 | static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm, |
705 | unsigned long *_sp) | |
1da177e4 LT |
706 | { |
707 | unsigned long index, stop, sp; | |
708 | char *src; | |
709 | int ret = 0; | |
710 | ||
711 | stop = bprm->p >> PAGE_SHIFT; | |
712 | sp = *_sp; | |
713 | ||
714 | for (index = MAX_ARG_PAGES - 1; index >= stop; index--) { | |
715 | src = kmap(bprm->page[index]); | |
716 | sp -= PAGE_SIZE; | |
717 | if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0) | |
718 | ret = -EFAULT; | |
719 | kunmap(bprm->page[index]); | |
720 | if (ret < 0) | |
721 | goto out; | |
722 | } | |
723 | ||
724 | *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15; | |
725 | ||
8a2ab7f5 | 726 | out: |
1da177e4 | 727 | return ret; |
8a2ab7f5 | 728 | } |
1da177e4 LT |
729 | #endif |
730 | ||
731 | /*****************************************************************************/ | |
732 | /* | |
733 | * load the appropriate binary image (executable or interpreter) into memory | |
734 | * - we assume no MMU is available | |
735 | * - if no other PIC bits are set in params->hdr->e_flags | |
736 | * - we assume that the LOADable segments in the binary are independently relocatable | |
737 | * - we assume R/O executable segments are shareable | |
738 | * - else | |
739 | * - we assume the loadable parts of the image to require fixed displacement | |
740 | * - the image is not shareable | |
741 | */ | |
742 | static int elf_fdpic_map_file(struct elf_fdpic_params *params, | |
743 | struct file *file, | |
744 | struct mm_struct *mm, | |
745 | const char *what) | |
746 | { | |
747 | struct elf32_fdpic_loadmap *loadmap; | |
748 | #ifdef CONFIG_MMU | |
749 | struct elf32_fdpic_loadseg *mseg; | |
750 | #endif | |
751 | struct elf32_fdpic_loadseg *seg; | |
752 | struct elf32_phdr *phdr; | |
753 | unsigned long load_addr, stop; | |
754 | unsigned nloads, tmp; | |
755 | size_t size; | |
756 | int loop, ret; | |
757 | ||
758 | /* allocate a load map table */ | |
759 | nloads = 0; | |
760 | for (loop = 0; loop < params->hdr.e_phnum; loop++) | |
761 | if (params->phdrs[loop].p_type == PT_LOAD) | |
762 | nloads++; | |
763 | ||
764 | if (nloads == 0) | |
765 | return -ELIBBAD; | |
766 | ||
767 | size = sizeof(*loadmap) + nloads * sizeof(*seg); | |
b87576d5 | 768 | loadmap = kzalloc(size, GFP_KERNEL); |
1da177e4 LT |
769 | if (!loadmap) |
770 | return -ENOMEM; | |
771 | ||
772 | params->loadmap = loadmap; | |
1da177e4 LT |
773 | |
774 | loadmap->version = ELF32_FDPIC_LOADMAP_VERSION; | |
775 | loadmap->nsegs = nloads; | |
776 | ||
777 | load_addr = params->load_addr; | |
778 | seg = loadmap->segs; | |
779 | ||
780 | /* map the requested LOADs into the memory space */ | |
781 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
782 | case ELF_FDPIC_FLAG_CONSTDISP: | |
783 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
784 | #ifndef CONFIG_MMU | |
785 | ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm); | |
786 | if (ret < 0) | |
787 | return ret; | |
788 | break; | |
789 | #endif | |
790 | default: | |
791 | ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm); | |
792 | if (ret < 0) | |
793 | return ret; | |
794 | break; | |
795 | } | |
796 | ||
797 | /* map the entry point */ | |
798 | if (params->hdr.e_entry) { | |
799 | seg = loadmap->segs; | |
800 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
801 | if (params->hdr.e_entry >= seg->p_vaddr && | |
8a2ab7f5 | 802 | params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) { |
1da177e4 | 803 | params->entry_addr = |
8a2ab7f5 DH |
804 | (params->hdr.e_entry - seg->p_vaddr) + |
805 | seg->addr; | |
1da177e4 LT |
806 | break; |
807 | } | |
808 | } | |
809 | } | |
810 | ||
811 | /* determine where the program header table has wound up if mapped */ | |
8a2ab7f5 DH |
812 | stop = params->hdr.e_phoff; |
813 | stop += params->hdr.e_phnum * sizeof (struct elf_phdr); | |
1da177e4 LT |
814 | phdr = params->phdrs; |
815 | ||
816 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
817 | if (phdr->p_type != PT_LOAD) | |
818 | continue; | |
819 | ||
820 | if (phdr->p_offset > params->hdr.e_phoff || | |
821 | phdr->p_offset + phdr->p_filesz < stop) | |
822 | continue; | |
823 | ||
824 | seg = loadmap->segs; | |
825 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
826 | if (phdr->p_vaddr >= seg->p_vaddr && | |
8a2ab7f5 DH |
827 | phdr->p_vaddr + phdr->p_filesz <= |
828 | seg->p_vaddr + seg->p_memsz) { | |
829 | params->ph_addr = | |
830 | (phdr->p_vaddr - seg->p_vaddr) + | |
831 | seg->addr + | |
1da177e4 LT |
832 | params->hdr.e_phoff - phdr->p_offset; |
833 | break; | |
834 | } | |
835 | } | |
836 | break; | |
837 | } | |
838 | ||
839 | /* determine where the dynamic section has wound up if there is one */ | |
840 | phdr = params->phdrs; | |
841 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
842 | if (phdr->p_type != PT_DYNAMIC) | |
843 | continue; | |
844 | ||
845 | seg = loadmap->segs; | |
846 | for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { | |
847 | if (phdr->p_vaddr >= seg->p_vaddr && | |
8a2ab7f5 DH |
848 | phdr->p_vaddr + phdr->p_memsz <= |
849 | seg->p_vaddr + seg->p_memsz) { | |
850 | params->dynamic_addr = | |
851 | (phdr->p_vaddr - seg->p_vaddr) + | |
852 | seg->addr; | |
853 | ||
854 | /* check the dynamic section contains at least | |
855 | * one item, and that the last item is a NULL | |
856 | * entry */ | |
1da177e4 LT |
857 | if (phdr->p_memsz == 0 || |
858 | phdr->p_memsz % sizeof(Elf32_Dyn) != 0) | |
859 | goto dynamic_error; | |
860 | ||
861 | tmp = phdr->p_memsz / sizeof(Elf32_Dyn); | |
8a2ab7f5 DH |
862 | if (((Elf32_Dyn *) |
863 | params->dynamic_addr)[tmp - 1].d_tag != 0) | |
1da177e4 LT |
864 | goto dynamic_error; |
865 | break; | |
866 | } | |
867 | } | |
868 | break; | |
869 | } | |
870 | ||
871 | /* now elide adjacent segments in the load map on MMU linux | |
8a2ab7f5 DH |
872 | * - on uClinux the holes between may actually be filled with system |
873 | * stuff or stuff from other processes | |
1da177e4 LT |
874 | */ |
875 | #ifdef CONFIG_MMU | |
876 | nloads = loadmap->nsegs; | |
877 | mseg = loadmap->segs; | |
878 | seg = mseg + 1; | |
879 | for (loop = 1; loop < nloads; loop++) { | |
880 | /* see if we have a candidate for merging */ | |
881 | if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { | |
882 | load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); | |
883 | if (load_addr == (seg->addr & PAGE_MASK)) { | |
8a2ab7f5 DH |
884 | mseg->p_memsz += |
885 | load_addr - | |
886 | (mseg->addr + mseg->p_memsz); | |
1da177e4 LT |
887 | mseg->p_memsz += seg->addr & ~PAGE_MASK; |
888 | mseg->p_memsz += seg->p_memsz; | |
889 | loadmap->nsegs--; | |
890 | continue; | |
891 | } | |
892 | } | |
893 | ||
894 | mseg++; | |
895 | if (mseg != seg) | |
896 | *mseg = *seg; | |
897 | } | |
898 | #endif | |
899 | ||
900 | kdebug("Mapped Object [%s]:", what); | |
901 | kdebug("- elfhdr : %lx", params->elfhdr_addr); | |
902 | kdebug("- entry : %lx", params->entry_addr); | |
903 | kdebug("- PHDR[] : %lx", params->ph_addr); | |
904 | kdebug("- DYNAMIC[]: %lx", params->dynamic_addr); | |
905 | seg = loadmap->segs; | |
906 | for (loop = 0; loop < loadmap->nsegs; loop++, seg++) | |
907 | kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]", | |
908 | loop, | |
909 | seg->addr, seg->addr + seg->p_memsz - 1, | |
910 | seg->p_vaddr, seg->p_memsz); | |
911 | ||
912 | return 0; | |
913 | ||
8a2ab7f5 | 914 | dynamic_error: |
1da177e4 | 915 | printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", |
0f7fc9e4 | 916 | what, file->f_path.dentry->d_inode->i_ino); |
1da177e4 | 917 | return -ELIBBAD; |
8a2ab7f5 | 918 | } |
1da177e4 LT |
919 | |
920 | /*****************************************************************************/ | |
921 | /* | |
922 | * map a file with constant displacement under uClinux | |
923 | */ | |
924 | #ifndef CONFIG_MMU | |
8a2ab7f5 DH |
925 | static int elf_fdpic_map_file_constdisp_on_uclinux( |
926 | struct elf_fdpic_params *params, | |
927 | struct file *file, | |
928 | struct mm_struct *mm) | |
1da177e4 LT |
929 | { |
930 | struct elf32_fdpic_loadseg *seg; | |
931 | struct elf32_phdr *phdr; | |
932 | unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags; | |
933 | loff_t fpos; | |
934 | int loop, ret; | |
935 | ||
936 | load_addr = params->load_addr; | |
937 | seg = params->loadmap->segs; | |
938 | ||
8a2ab7f5 DH |
939 | /* determine the bounds of the contiguous overall allocation we must |
940 | * make */ | |
1da177e4 LT |
941 | phdr = params->phdrs; |
942 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
943 | if (params->phdrs[loop].p_type != PT_LOAD) | |
944 | continue; | |
945 | ||
946 | if (base > phdr->p_vaddr) | |
947 | base = phdr->p_vaddr; | |
948 | if (top < phdr->p_vaddr + phdr->p_memsz) | |
949 | top = phdr->p_vaddr + phdr->p_memsz; | |
950 | } | |
951 | ||
952 | /* allocate one big anon block for everything */ | |
953 | mflags = MAP_PRIVATE; | |
954 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
955 | mflags |= MAP_EXECUTABLE; | |
956 | ||
957 | down_write(&mm->mmap_sem); | |
958 | maddr = do_mmap(NULL, load_addr, top - base, | |
959 | PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); | |
960 | up_write(&mm->mmap_sem); | |
8a2ab7f5 | 961 | if (IS_ERR_VALUE(maddr)) |
1da177e4 LT |
962 | return (int) maddr; |
963 | ||
964 | if (load_addr != 0) | |
965 | load_addr += PAGE_ALIGN(top - base); | |
966 | ||
967 | /* and then load the file segments into it */ | |
968 | phdr = params->phdrs; | |
969 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
970 | if (params->phdrs[loop].p_type != PT_LOAD) | |
971 | continue; | |
972 | ||
973 | fpos = phdr->p_offset; | |
974 | ||
975 | seg->addr = maddr + (phdr->p_vaddr - base); | |
976 | seg->p_vaddr = phdr->p_vaddr; | |
977 | seg->p_memsz = phdr->p_memsz; | |
978 | ||
8a2ab7f5 DH |
979 | ret = file->f_op->read(file, (void *) seg->addr, |
980 | phdr->p_filesz, &fpos); | |
1da177e4 LT |
981 | if (ret < 0) |
982 | return ret; | |
983 | ||
984 | /* map the ELF header address if in this segment */ | |
985 | if (phdr->p_offset == 0) | |
986 | params->elfhdr_addr = seg->addr; | |
987 | ||
988 | /* clear any space allocated but not loaded */ | |
ab4ad555 | 989 | if (phdr->p_filesz < phdr->p_memsz) { |
e30c7c3b TY |
990 | if (clear_user((void *) (seg->addr + phdr->p_filesz), |
991 | phdr->p_memsz - phdr->p_filesz)) | |
992 | return -EFAULT; | |
ab4ad555 | 993 | } |
1da177e4 LT |
994 | |
995 | if (mm) { | |
996 | if (phdr->p_flags & PF_X) { | |
aa289b47 DH |
997 | if (!mm->start_code) { |
998 | mm->start_code = seg->addr; | |
999 | mm->end_code = seg->addr + | |
1000 | phdr->p_memsz; | |
1001 | } | |
8a2ab7f5 | 1002 | } else if (!mm->start_data) { |
1da177e4 | 1003 | mm->start_data = seg->addr; |
1da177e4 | 1004 | mm->end_data = seg->addr + phdr->p_memsz; |
1da177e4 | 1005 | } |
1da177e4 LT |
1006 | } |
1007 | ||
1008 | seg++; | |
1009 | } | |
1010 | ||
1011 | return 0; | |
8a2ab7f5 | 1012 | } |
1da177e4 LT |
1013 | #endif |
1014 | ||
1015 | /*****************************************************************************/ | |
1016 | /* | |
1017 | * map a binary by direct mmap() of the individual PT_LOAD segments | |
1018 | */ | |
1019 | static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, | |
1020 | struct file *file, | |
1021 | struct mm_struct *mm) | |
1022 | { | |
1023 | struct elf32_fdpic_loadseg *seg; | |
1024 | struct elf32_phdr *phdr; | |
1025 | unsigned long load_addr, delta_vaddr; | |
e30c7c3b | 1026 | int loop, dvset; |
1da177e4 LT |
1027 | |
1028 | load_addr = params->load_addr; | |
1029 | delta_vaddr = 0; | |
1030 | dvset = 0; | |
1031 | ||
1032 | seg = params->loadmap->segs; | |
1033 | ||
1034 | /* deal with each load segment separately */ | |
1035 | phdr = params->phdrs; | |
1036 | for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { | |
1037 | unsigned long maddr, disp, excess, excess1; | |
1038 | int prot = 0, flags; | |
1039 | ||
1040 | if (phdr->p_type != PT_LOAD) | |
1041 | continue; | |
1042 | ||
1043 | kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx", | |
1044 | (unsigned long) phdr->p_vaddr, | |
1045 | (unsigned long) phdr->p_offset, | |
1046 | (unsigned long) phdr->p_filesz, | |
1047 | (unsigned long) phdr->p_memsz); | |
1048 | ||
1049 | /* determine the mapping parameters */ | |
1050 | if (phdr->p_flags & PF_R) prot |= PROT_READ; | |
1051 | if (phdr->p_flags & PF_W) prot |= PROT_WRITE; | |
1052 | if (phdr->p_flags & PF_X) prot |= PROT_EXEC; | |
1053 | ||
1054 | flags = MAP_PRIVATE | MAP_DENYWRITE; | |
1055 | if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE) | |
1056 | flags |= MAP_EXECUTABLE; | |
1057 | ||
1058 | maddr = 0; | |
1059 | ||
1060 | switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) { | |
1061 | case ELF_FDPIC_FLAG_INDEPENDENT: | |
1062 | /* PT_LOADs are independently locatable */ | |
1063 | break; | |
1064 | ||
1065 | case ELF_FDPIC_FLAG_HONOURVADDR: | |
1066 | /* the specified virtual address must be honoured */ | |
1067 | maddr = phdr->p_vaddr; | |
1068 | flags |= MAP_FIXED; | |
1069 | break; | |
1070 | ||
1071 | case ELF_FDPIC_FLAG_CONSTDISP: | |
1072 | /* constant displacement | |
8a2ab7f5 DH |
1073 | * - can be mapped anywhere, but must be mapped as a |
1074 | * unit | |
1da177e4 LT |
1075 | */ |
1076 | if (!dvset) { | |
1077 | maddr = load_addr; | |
1078 | delta_vaddr = phdr->p_vaddr; | |
1079 | dvset = 1; | |
8a2ab7f5 | 1080 | } else { |
1da177e4 LT |
1081 | maddr = load_addr + phdr->p_vaddr - delta_vaddr; |
1082 | flags |= MAP_FIXED; | |
1083 | } | |
1084 | break; | |
1085 | ||
1086 | case ELF_FDPIC_FLAG_CONTIGUOUS: | |
1087 | /* contiguity handled later */ | |
1088 | break; | |
1089 | ||
1090 | default: | |
1091 | BUG(); | |
1092 | } | |
1093 | ||
1094 | maddr &= PAGE_MASK; | |
1095 | ||
1096 | /* create the mapping */ | |
1097 | disp = phdr->p_vaddr & ~PAGE_MASK; | |
1098 | down_write(&mm->mmap_sem); | |
1099 | maddr = do_mmap(file, maddr, phdr->p_memsz + disp, prot, flags, | |
1100 | phdr->p_offset - disp); | |
1101 | up_write(&mm->mmap_sem); | |
1102 | ||
1103 | kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", | |
8a2ab7f5 DH |
1104 | loop, phdr->p_memsz + disp, prot, flags, |
1105 | phdr->p_offset - disp, maddr); | |
1da177e4 | 1106 | |
8a2ab7f5 | 1107 | if (IS_ERR_VALUE(maddr)) |
1da177e4 LT |
1108 | return (int) maddr; |
1109 | ||
8a2ab7f5 DH |
1110 | if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == |
1111 | ELF_FDPIC_FLAG_CONTIGUOUS) | |
1da177e4 LT |
1112 | load_addr += PAGE_ALIGN(phdr->p_memsz + disp); |
1113 | ||
1114 | seg->addr = maddr + disp; | |
1115 | seg->p_vaddr = phdr->p_vaddr; | |
1116 | seg->p_memsz = phdr->p_memsz; | |
1117 | ||
1118 | /* map the ELF header address if in this segment */ | |
1119 | if (phdr->p_offset == 0) | |
1120 | params->elfhdr_addr = seg->addr; | |
1121 | ||
8a2ab7f5 DH |
1122 | /* clear the bit between beginning of mapping and beginning of |
1123 | * PT_LOAD */ | |
1da177e4 LT |
1124 | if (prot & PROT_WRITE && disp > 0) { |
1125 | kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); | |
e30c7c3b TY |
1126 | if (clear_user((void __user *) maddr, disp)) |
1127 | return -EFAULT; | |
1da177e4 LT |
1128 | maddr += disp; |
1129 | } | |
1130 | ||
1131 | /* clear any space allocated but not loaded | |
1132 | * - on uClinux we can just clear the lot | |
1133 | * - on MMU linux we'll get a SIGBUS beyond the last page | |
1134 | * extant in the file | |
1135 | */ | |
1136 | excess = phdr->p_memsz - phdr->p_filesz; | |
1137 | excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); | |
1138 | ||
1139 | #ifdef CONFIG_MMU | |
1da177e4 LT |
1140 | if (excess > excess1) { |
1141 | unsigned long xaddr = maddr + phdr->p_filesz + excess1; | |
1142 | unsigned long xmaddr; | |
1143 | ||
1144 | flags |= MAP_FIXED | MAP_ANONYMOUS; | |
1145 | down_write(&mm->mmap_sem); | |
8a2ab7f5 DH |
1146 | xmaddr = do_mmap(NULL, xaddr, excess - excess1, |
1147 | prot, flags, 0); | |
1da177e4 LT |
1148 | up_write(&mm->mmap_sem); |
1149 | ||
1150 | kdebug("mmap[%d] <anon>" | |
1151 | " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", | |
8a2ab7f5 DH |
1152 | loop, xaddr, excess - excess1, prot, flags, |
1153 | xmaddr); | |
1da177e4 LT |
1154 | |
1155 | if (xmaddr != xaddr) | |
1156 | return -ENOMEM; | |
1157 | } | |
1158 | ||
1159 | if (prot & PROT_WRITE && excess1 > 0) { | |
1160 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1161 | loop, maddr + phdr->p_filesz, excess1); | |
e30c7c3b TY |
1162 | if (clear_user((void __user *) maddr + phdr->p_filesz, |
1163 | excess1)) | |
1164 | return -EFAULT; | |
1da177e4 LT |
1165 | } |
1166 | ||
1167 | #else | |
1168 | if (excess > 0) { | |
1169 | kdebug("clear[%d] ad=%lx sz=%lx", | |
1170 | loop, maddr + phdr->p_filesz, excess); | |
e30c7c3b TY |
1171 | if (clear_user((void *) maddr + phdr->p_filesz, excess)) |
1172 | return -EFAULT; | |
1da177e4 LT |
1173 | } |
1174 | #endif | |
1175 | ||
1176 | if (mm) { | |
1177 | if (phdr->p_flags & PF_X) { | |
aa289b47 DH |
1178 | if (!mm->start_code) { |
1179 | mm->start_code = maddr; | |
1180 | mm->end_code = maddr + phdr->p_memsz; | |
1181 | } | |
8a2ab7f5 | 1182 | } else if (!mm->start_data) { |
1da177e4 LT |
1183 | mm->start_data = maddr; |
1184 | mm->end_data = maddr + phdr->p_memsz; | |
1185 | } | |
1186 | } | |
1187 | ||
1188 | seg++; | |
1189 | } | |
1190 | ||
1191 | return 0; | |
8a2ab7f5 | 1192 | } |
6d8c4e3b DH |
1193 | |
1194 | /*****************************************************************************/ | |
1195 | /* | |
1196 | * ELF-FDPIC core dumper | |
1197 | * | |
1198 | * Modelled on fs/exec.c:aout_core_dump() | |
1199 | * Jeremy Fitzhardinge <jeremy@sw.oz.au> | |
1200 | * | |
1201 | * Modelled on fs/binfmt_elf.c core dumper | |
1202 | */ | |
698ba7b5 | 1203 | #ifdef CONFIG_ELF_CORE |
6d8c4e3b | 1204 | |
6d8c4e3b DH |
1205 | /* |
1206 | * Decide whether a segment is worth dumping; default is yes to be | |
1207 | * sure (missing info is worse than too much; etc). | |
1208 | * Personally I'd include everything, and use the coredump limit... | |
1209 | * | |
1210 | * I think we should skip something. But I am not sure how. H.J. | |
1211 | */ | |
ee78b0a6 | 1212 | static int maydump(struct vm_area_struct *vma, unsigned long mm_flags) |
6d8c4e3b | 1213 | { |
ee78b0a6 KH |
1214 | int dump_ok; |
1215 | ||
6d8c4e3b DH |
1216 | /* Do not dump I/O mapped devices or special mappings */ |
1217 | if (vma->vm_flags & (VM_IO | VM_RESERVED)) { | |
1218 | kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags); | |
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | /* If we may not read the contents, don't allow us to dump | |
1223 | * them either. "dump_write()" can't handle it anyway. | |
1224 | */ | |
1225 | if (!(vma->vm_flags & VM_READ)) { | |
1226 | kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags); | |
1227 | return 0; | |
1228 | } | |
1229 | ||
ee78b0a6 | 1230 | /* By default, dump shared memory if mapped from an anonymous file. */ |
6d8c4e3b | 1231 | if (vma->vm_flags & VM_SHARED) { |
0f7fc9e4 | 1232 | if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0) { |
ee78b0a6 KH |
1233 | dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags); |
1234 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, | |
1235 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1236 | return dump_ok; | |
6d8c4e3b DH |
1237 | } |
1238 | ||
ee78b0a6 KH |
1239 | dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags); |
1240 | kdcore("%08lx: %08lx: %s (share)", vma->vm_start, | |
1241 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1242 | return dump_ok; | |
6d8c4e3b DH |
1243 | } |
1244 | ||
1245 | #ifdef CONFIG_MMU | |
ee78b0a6 | 1246 | /* By default, if it hasn't been written to, don't write it out */ |
6d8c4e3b | 1247 | if (!vma->anon_vma) { |
ee78b0a6 KH |
1248 | dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags); |
1249 | kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start, | |
1250 | vma->vm_flags, dump_ok ? "yes" : "no"); | |
1251 | return dump_ok; | |
6d8c4e3b DH |
1252 | } |
1253 | #endif | |
1254 | ||
ee78b0a6 KH |
1255 | dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags); |
1256 | kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags, | |
1257 | dump_ok ? "yes" : "no"); | |
1258 | return dump_ok; | |
6d8c4e3b DH |
1259 | } |
1260 | ||
1261 | /* An ELF note in memory */ | |
1262 | struct memelfnote | |
1263 | { | |
1264 | const char *name; | |
1265 | int type; | |
1266 | unsigned int datasz; | |
1267 | void *data; | |
1268 | }; | |
1269 | ||
1270 | static int notesize(struct memelfnote *en) | |
1271 | { | |
1272 | int sz; | |
1273 | ||
1274 | sz = sizeof(struct elf_note); | |
1275 | sz += roundup(strlen(en->name) + 1, 4); | |
1276 | sz += roundup(en->datasz, 4); | |
1277 | ||
1278 | return sz; | |
1279 | } | |
1280 | ||
1281 | /* #define DEBUG */ | |
1282 | ||
05f47fda DH |
1283 | #define DUMP_WRITE(addr, nr, foffset) \ |
1284 | do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0) | |
6d8c4e3b | 1285 | |
05f47fda | 1286 | static int alignfile(struct file *file, loff_t *foffset) |
6d8c4e3b | 1287 | { |
05f47fda DH |
1288 | static const char buf[4] = { 0, }; |
1289 | DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset); | |
1290 | return 1; | |
1291 | } | |
6d8c4e3b | 1292 | |
05f47fda DH |
1293 | static int writenote(struct memelfnote *men, struct file *file, |
1294 | loff_t *foffset) | |
1295 | { | |
1296 | struct elf_note en; | |
6d8c4e3b DH |
1297 | en.n_namesz = strlen(men->name) + 1; |
1298 | en.n_descsz = men->datasz; | |
1299 | en.n_type = men->type; | |
1300 | ||
05f47fda DH |
1301 | DUMP_WRITE(&en, sizeof(en), foffset); |
1302 | DUMP_WRITE(men->name, en.n_namesz, foffset); | |
1303 | if (!alignfile(file, foffset)) | |
1304 | return 0; | |
1305 | DUMP_WRITE(men->data, men->datasz, foffset); | |
1306 | if (!alignfile(file, foffset)) | |
1307 | return 0; | |
6d8c4e3b DH |
1308 | |
1309 | return 1; | |
1310 | } | |
1311 | #undef DUMP_WRITE | |
6d8c4e3b | 1312 | |
6d8c4e3b DH |
1313 | static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs) |
1314 | { | |
1315 | memcpy(elf->e_ident, ELFMAG, SELFMAG); | |
1316 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1317 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1318 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1319 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1320 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); | |
1321 | ||
1322 | elf->e_type = ET_CORE; | |
1323 | elf->e_machine = ELF_ARCH; | |
1324 | elf->e_version = EV_CURRENT; | |
1325 | elf->e_entry = 0; | |
1326 | elf->e_phoff = sizeof(struct elfhdr); | |
1327 | elf->e_shoff = 0; | |
1328 | elf->e_flags = ELF_FDPIC_CORE_EFLAGS; | |
1329 | elf->e_ehsize = sizeof(struct elfhdr); | |
1330 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1331 | elf->e_phnum = segs; | |
1332 | elf->e_shentsize = 0; | |
1333 | elf->e_shnum = 0; | |
1334 | elf->e_shstrndx = 0; | |
1335 | return; | |
1336 | } | |
1337 | ||
1338 | static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset) | |
1339 | { | |
1340 | phdr->p_type = PT_NOTE; | |
1341 | phdr->p_offset = offset; | |
1342 | phdr->p_vaddr = 0; | |
1343 | phdr->p_paddr = 0; | |
1344 | phdr->p_filesz = sz; | |
1345 | phdr->p_memsz = 0; | |
1346 | phdr->p_flags = 0; | |
1347 | phdr->p_align = 0; | |
1348 | return; | |
1349 | } | |
1350 | ||
1351 | static inline void fill_note(struct memelfnote *note, const char *name, int type, | |
1352 | unsigned int sz, void *data) | |
1353 | { | |
1354 | note->name = name; | |
1355 | note->type = type; | |
1356 | note->datasz = sz; | |
1357 | note->data = data; | |
1358 | return; | |
1359 | } | |
1360 | ||
1361 | /* | |
1362 | * fill up all the fields in prstatus from the given task struct, except | |
3ad2f3fb | 1363 | * registers which need to be filled up separately. |
6d8c4e3b DH |
1364 | */ |
1365 | static void fill_prstatus(struct elf_prstatus *prstatus, | |
1366 | struct task_struct *p, long signr) | |
1367 | { | |
1368 | prstatus->pr_info.si_signo = prstatus->pr_cursig = signr; | |
1369 | prstatus->pr_sigpend = p->pending.signal.sig[0]; | |
1370 | prstatus->pr_sighold = p->blocked.sig[0]; | |
3b34fc58 ON |
1371 | rcu_read_lock(); |
1372 | prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1373 | rcu_read_unlock(); | |
b488893a | 1374 | prstatus->pr_pid = task_pid_vnr(p); |
b488893a PE |
1375 | prstatus->pr_pgrp = task_pgrp_vnr(p); |
1376 | prstatus->pr_sid = task_session_vnr(p); | |
6d8c4e3b | 1377 | if (thread_group_leader(p)) { |
2515ddc6 PM |
1378 | struct task_cputime cputime; |
1379 | ||
6d8c4e3b | 1380 | /* |
2515ddc6 PM |
1381 | * This is the record for the group leader. It shows the |
1382 | * group-wide total, not its individual thread total. | |
6d8c4e3b | 1383 | */ |
2515ddc6 PM |
1384 | thread_group_cputime(p, &cputime); |
1385 | cputime_to_timeval(cputime.utime, &prstatus->pr_utime); | |
1386 | cputime_to_timeval(cputime.stime, &prstatus->pr_stime); | |
6d8c4e3b DH |
1387 | } else { |
1388 | cputime_to_timeval(p->utime, &prstatus->pr_utime); | |
1389 | cputime_to_timeval(p->stime, &prstatus->pr_stime); | |
1390 | } | |
1391 | cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime); | |
1392 | cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime); | |
1393 | ||
1394 | prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap; | |
1395 | prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap; | |
1396 | } | |
1397 | ||
1398 | static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p, | |
1399 | struct mm_struct *mm) | |
1400 | { | |
c69e8d9c | 1401 | const struct cred *cred; |
6d8c4e3b DH |
1402 | unsigned int i, len; |
1403 | ||
1404 | /* first copy the parameters from user space */ | |
1405 | memset(psinfo, 0, sizeof(struct elf_prpsinfo)); | |
1406 | ||
1407 | len = mm->arg_end - mm->arg_start; | |
1408 | if (len >= ELF_PRARGSZ) | |
1409 | len = ELF_PRARGSZ - 1; | |
1410 | if (copy_from_user(&psinfo->pr_psargs, | |
1411 | (const char __user *) mm->arg_start, len)) | |
1412 | return -EFAULT; | |
1413 | for (i = 0; i < len; i++) | |
1414 | if (psinfo->pr_psargs[i] == 0) | |
1415 | psinfo->pr_psargs[i] = ' '; | |
1416 | psinfo->pr_psargs[len] = 0; | |
1417 | ||
3b34fc58 ON |
1418 | rcu_read_lock(); |
1419 | psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent)); | |
1420 | rcu_read_unlock(); | |
b488893a | 1421 | psinfo->pr_pid = task_pid_vnr(p); |
b488893a PE |
1422 | psinfo->pr_pgrp = task_pgrp_vnr(p); |
1423 | psinfo->pr_sid = task_session_vnr(p); | |
6d8c4e3b DH |
1424 | |
1425 | i = p->state ? ffz(~p->state) + 1 : 0; | |
1426 | psinfo->pr_state = i; | |
1427 | psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i]; | |
1428 | psinfo->pr_zomb = psinfo->pr_sname == 'Z'; | |
1429 | psinfo->pr_nice = task_nice(p); | |
1430 | psinfo->pr_flag = p->flags; | |
c69e8d9c DH |
1431 | rcu_read_lock(); |
1432 | cred = __task_cred(p); | |
1433 | SET_UID(psinfo->pr_uid, cred->uid); | |
1434 | SET_GID(psinfo->pr_gid, cred->gid); | |
1435 | rcu_read_unlock(); | |
6d8c4e3b DH |
1436 | strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname)); |
1437 | ||
1438 | return 0; | |
1439 | } | |
1440 | ||
1441 | /* Here is the structure in which status of each thread is captured. */ | |
1442 | struct elf_thread_status | |
1443 | { | |
1444 | struct list_head list; | |
1445 | struct elf_prstatus prstatus; /* NT_PRSTATUS */ | |
1446 | elf_fpregset_t fpu; /* NT_PRFPREG */ | |
1447 | struct task_struct *thread; | |
1448 | #ifdef ELF_CORE_COPY_XFPREGS | |
5b20cd80 | 1449 | elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */ |
6d8c4e3b DH |
1450 | #endif |
1451 | struct memelfnote notes[3]; | |
1452 | int num_notes; | |
1453 | }; | |
1454 | ||
1455 | /* | |
1456 | * In order to add the specific thread information for the elf file format, | |
1457 | * we need to keep a linked list of every thread's pr_status and then create | |
1458 | * a single section for them in the final core file. | |
1459 | */ | |
1460 | static int elf_dump_thread_status(long signr, struct elf_thread_status *t) | |
1461 | { | |
1462 | struct task_struct *p = t->thread; | |
1463 | int sz = 0; | |
1464 | ||
1465 | t->num_notes = 0; | |
1466 | ||
1467 | fill_prstatus(&t->prstatus, p, signr); | |
1468 | elf_core_copy_task_regs(p, &t->prstatus.pr_reg); | |
1469 | ||
1470 | fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus), | |
1471 | &t->prstatus); | |
1472 | t->num_notes++; | |
1473 | sz += notesize(&t->notes[0]); | |
1474 | ||
1475 | t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu); | |
1476 | if (t->prstatus.pr_fpvalid) { | |
1477 | fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu), | |
1478 | &t->fpu); | |
1479 | t->num_notes++; | |
1480 | sz += notesize(&t->notes[1]); | |
1481 | } | |
1482 | ||
1483 | #ifdef ELF_CORE_COPY_XFPREGS | |
1484 | if (elf_core_copy_task_xfpregs(p, &t->xfpu)) { | |
5b20cd80 MN |
1485 | fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE, |
1486 | sizeof(t->xfpu), &t->xfpu); | |
6d8c4e3b DH |
1487 | t->num_notes++; |
1488 | sz += notesize(&t->notes[2]); | |
1489 | } | |
1490 | #endif | |
1491 | return sz; | |
1492 | } | |
1493 | ||
8d9032bb DH |
1494 | static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum, |
1495 | elf_addr_t e_shoff, int segs) | |
1496 | { | |
1497 | elf->e_shoff = e_shoff; | |
1498 | elf->e_shentsize = sizeof(*shdr4extnum); | |
1499 | elf->e_shnum = 1; | |
1500 | elf->e_shstrndx = SHN_UNDEF; | |
1501 | ||
1502 | memset(shdr4extnum, 0, sizeof(*shdr4extnum)); | |
1503 | ||
1504 | shdr4extnum->sh_type = SHT_NULL; | |
1505 | shdr4extnum->sh_size = elf->e_shnum; | |
1506 | shdr4extnum->sh_link = elf->e_shstrndx; | |
1507 | shdr4extnum->sh_info = segs; | |
1508 | } | |
1509 | ||
6d8c4e3b DH |
1510 | /* |
1511 | * dump the segments for an MMU process | |
1512 | */ | |
1513 | #ifdef CONFIG_MMU | |
e2e00906 | 1514 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
ee78b0a6 | 1515 | unsigned long *limit, unsigned long mm_flags) |
6d8c4e3b DH |
1516 | { |
1517 | struct vm_area_struct *vma; | |
f3e8fccd | 1518 | int err = 0; |
6d8c4e3b DH |
1519 | |
1520 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { | |
1521 | unsigned long addr; | |
1522 | ||
ee78b0a6 | 1523 | if (!maydump(vma, mm_flags)) |
6d8c4e3b DH |
1524 | continue; |
1525 | ||
f3e8fccd HD |
1526 | for (addr = vma->vm_start; addr < vma->vm_end; |
1527 | addr += PAGE_SIZE) { | |
1528 | struct page *page = get_dump_page(addr); | |
1529 | if (page) { | |
1530 | void *kaddr = kmap(page); | |
1531 | *size += PAGE_SIZE; | |
1532 | if (*size > *limit) | |
1533 | err = -EFBIG; | |
1534 | else if (!dump_write(file, kaddr, PAGE_SIZE)) | |
1535 | err = -EIO; | |
6d8c4e3b DH |
1536 | kunmap(page); |
1537 | page_cache_release(page); | |
05f47fda | 1538 | } else if (!dump_seek(file, PAGE_SIZE)) |
f3e8fccd HD |
1539 | err = -EFBIG; |
1540 | if (err) | |
1541 | goto out; | |
6d8c4e3b DH |
1542 | } |
1543 | } | |
f3e8fccd HD |
1544 | out: |
1545 | return err; | |
6d8c4e3b DH |
1546 | } |
1547 | #endif | |
1548 | ||
1549 | /* | |
1550 | * dump the segments for a NOMMU process | |
1551 | */ | |
1552 | #ifndef CONFIG_MMU | |
e2e00906 | 1553 | static int elf_fdpic_dump_segments(struct file *file, size_t *size, |
ee78b0a6 | 1554 | unsigned long *limit, unsigned long mm_flags) |
6d8c4e3b | 1555 | { |
8feae131 | 1556 | struct vm_area_struct *vma; |
6d8c4e3b | 1557 | |
8feae131 | 1558 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
ee78b0a6 | 1559 | if (!maydump(vma, mm_flags)) |
6d8c4e3b DH |
1560 | continue; |
1561 | ||
1562 | if ((*size += PAGE_SIZE) > *limit) | |
1563 | return -EFBIG; | |
1564 | ||
1565 | if (!dump_write(file, (void *) vma->vm_start, | |
1566 | vma->vm_end - vma->vm_start)) | |
1567 | return -EIO; | |
1568 | } | |
1569 | ||
1570 | return 0; | |
1571 | } | |
1572 | #endif | |
1573 | ||
8d9032bb DH |
1574 | static size_t elf_core_vma_data_size(unsigned long mm_flags) |
1575 | { | |
1576 | struct vm_area_struct *vma; | |
1577 | size_t size = 0; | |
1578 | ||
47568d4c | 1579 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) |
8d9032bb DH |
1580 | if (maydump(vma, mm_flags)) |
1581 | size += vma->vm_end - vma->vm_start; | |
1582 | return size; | |
1583 | } | |
1584 | ||
6d8c4e3b DH |
1585 | /* |
1586 | * Actual dumper | |
1587 | * | |
1588 | * This is a two-pass process; first we find the offsets of the bits, | |
1589 | * and then they are actually written out. If we run out of core limit | |
1590 | * we just truncate. | |
1591 | */ | |
f6151dfe | 1592 | static int elf_fdpic_core_dump(struct coredump_params *cprm) |
6d8c4e3b DH |
1593 | { |
1594 | #define NUM_NOTES 6 | |
1595 | int has_dumped = 0; | |
1596 | mm_segment_t fs; | |
1597 | int segs; | |
1598 | size_t size = 0; | |
1599 | int i; | |
1600 | struct vm_area_struct *vma; | |
1601 | struct elfhdr *elf = NULL; | |
05f47fda | 1602 | loff_t offset = 0, dataoff, foffset; |
6d8c4e3b DH |
1603 | int numnote; |
1604 | struct memelfnote *notes = NULL; | |
1605 | struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */ | |
1606 | struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */ | |
6d8c4e3b DH |
1607 | LIST_HEAD(thread_list); |
1608 | struct list_head *t; | |
1609 | elf_fpregset_t *fpu = NULL; | |
1610 | #ifdef ELF_CORE_COPY_XFPREGS | |
1611 | elf_fpxregset_t *xfpu = NULL; | |
1612 | #endif | |
1613 | int thread_status_size = 0; | |
6d8c4e3b | 1614 | elf_addr_t *auxv; |
93eb211e | 1615 | struct elf_phdr *phdr4note = NULL; |
8d9032bb DH |
1616 | struct elf_shdr *shdr4extnum = NULL; |
1617 | Elf_Half e_phnum; | |
1618 | elf_addr_t e_shoff; | |
6d8c4e3b DH |
1619 | |
1620 | /* | |
1621 | * We no longer stop all VM operations. | |
1622 | * | |
1623 | * This is because those proceses that could possibly change map_count | |
1624 | * or the mmap / vma pages are now blocked in do_exit on current | |
1625 | * finishing this core dump. | |
1626 | * | |
1627 | * Only ptrace can touch these memory addresses, but it doesn't change | |
1628 | * the map_count or the pages allocated. So no possibility of crashing | |
1629 | * exists while dumping the mm->vm_next areas to the core file. | |
1630 | */ | |
1631 | ||
1632 | /* alloc memory for large data structures: too large to be on stack */ | |
1633 | elf = kmalloc(sizeof(*elf), GFP_KERNEL); | |
1634 | if (!elf) | |
1635 | goto cleanup; | |
1636 | prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL); | |
1637 | if (!prstatus) | |
1638 | goto cleanup; | |
1639 | psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL); | |
1640 | if (!psinfo) | |
1641 | goto cleanup; | |
1642 | notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL); | |
1643 | if (!notes) | |
1644 | goto cleanup; | |
1645 | fpu = kmalloc(sizeof(*fpu), GFP_KERNEL); | |
1646 | if (!fpu) | |
1647 | goto cleanup; | |
1648 | #ifdef ELF_CORE_COPY_XFPREGS | |
1649 | xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL); | |
1650 | if (!xfpu) | |
1651 | goto cleanup; | |
1652 | #endif | |
1653 | ||
f6151dfe | 1654 | if (cprm->signr) { |
182c515f | 1655 | struct core_thread *ct; |
6d8c4e3b | 1656 | struct elf_thread_status *tmp; |
182c515f ON |
1657 | |
1658 | for (ct = current->mm->core_state->dumper.next; | |
1659 | ct; ct = ct->next) { | |
1660 | tmp = kzalloc(sizeof(*tmp), GFP_KERNEL); | |
1661 | if (!tmp) | |
1662 | goto cleanup; | |
1663 | ||
1664 | tmp->thread = ct->task; | |
1665 | list_add(&tmp->list, &thread_list); | |
1666 | } | |
1667 | ||
6d8c4e3b DH |
1668 | list_for_each(t, &thread_list) { |
1669 | struct elf_thread_status *tmp; | |
1670 | int sz; | |
1671 | ||
1672 | tmp = list_entry(t, struct elf_thread_status, list); | |
f6151dfe | 1673 | sz = elf_dump_thread_status(cprm->signr, tmp); |
6d8c4e3b DH |
1674 | thread_status_size += sz; |
1675 | } | |
1676 | } | |
1677 | ||
1678 | /* now collect the dump for the current */ | |
f6151dfe MH |
1679 | fill_prstatus(prstatus, current, cprm->signr); |
1680 | elf_core_copy_regs(&prstatus->pr_reg, cprm->regs); | |
6d8c4e3b | 1681 | |
6d8c4e3b | 1682 | segs = current->mm->map_count; |
1fcccbac | 1683 | segs += elf_core_extra_phdrs(); |
6d8c4e3b | 1684 | |
8d9032bb DH |
1685 | /* for notes section */ |
1686 | segs++; | |
1687 | ||
1688 | /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid | |
1689 | * this, kernel supports extended numbering. Have a look at | |
1690 | * include/linux/elf.h for further information. */ | |
1691 | e_phnum = segs > PN_XNUM ? PN_XNUM : segs; | |
1692 | ||
6d8c4e3b | 1693 | /* Set up header */ |
8d9032bb | 1694 | fill_elf_fdpic_header(elf, e_phnum); |
6d8c4e3b DH |
1695 | |
1696 | has_dumped = 1; | |
1697 | current->flags |= PF_DUMPCORE; | |
1698 | ||
1699 | /* | |
1700 | * Set up the notes in similar form to SVR4 core dumps made | |
1701 | * with info from their /proc. | |
1702 | */ | |
1703 | ||
1704 | fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus); | |
1705 | fill_psinfo(psinfo, current->group_leader, current->mm); | |
1706 | fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo); | |
1707 | ||
1708 | numnote = 2; | |
1709 | ||
1710 | auxv = (elf_addr_t *) current->mm->saved_auxv; | |
1711 | ||
1712 | i = 0; | |
1713 | do | |
1714 | i += 2; | |
1715 | while (auxv[i - 2] != AT_NULL); | |
1716 | fill_note(¬es[numnote++], "CORE", NT_AUXV, | |
1717 | i * sizeof(elf_addr_t), auxv); | |
1718 | ||
1719 | /* Try to dump the FPU. */ | |
1720 | if ((prstatus->pr_fpvalid = | |
f6151dfe | 1721 | elf_core_copy_task_fpregs(current, cprm->regs, fpu))) |
6d8c4e3b DH |
1722 | fill_note(notes + numnote++, |
1723 | "CORE", NT_PRFPREG, sizeof(*fpu), fpu); | |
1724 | #ifdef ELF_CORE_COPY_XFPREGS | |
1725 | if (elf_core_copy_task_xfpregs(current, xfpu)) | |
1726 | fill_note(notes + numnote++, | |
5b20cd80 | 1727 | "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu); |
6d8c4e3b DH |
1728 | #endif |
1729 | ||
1730 | fs = get_fs(); | |
1731 | set_fs(KERNEL_DS); | |
1732 | ||
6d8c4e3b | 1733 | offset += sizeof(*elf); /* Elf header */ |
8d9032bb | 1734 | offset += segs * sizeof(struct elf_phdr); /* Program headers */ |
05f47fda | 1735 | foffset = offset; |
6d8c4e3b DH |
1736 | |
1737 | /* Write notes phdr entry */ | |
1738 | { | |
6d8c4e3b DH |
1739 | int sz = 0; |
1740 | ||
1741 | for (i = 0; i < numnote; i++) | |
1742 | sz += notesize(notes + i); | |
1743 | ||
1744 | sz += thread_status_size; | |
1745 | ||
93eb211e DH |
1746 | phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL); |
1747 | if (!phdr4note) | |
088e7af7 | 1748 | goto end_coredump; |
93eb211e DH |
1749 | |
1750 | fill_elf_note_phdr(phdr4note, sz, offset); | |
1751 | offset += sz; | |
6d8c4e3b DH |
1752 | } |
1753 | ||
1754 | /* Page-align dumped data */ | |
1755 | dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE); | |
1756 | ||
30736a4d | 1757 | offset += elf_core_vma_data_size(cprm->mm_flags); |
8d9032bb DH |
1758 | offset += elf_core_extra_data_size(); |
1759 | e_shoff = offset; | |
1760 | ||
1761 | if (e_phnum == PN_XNUM) { | |
1762 | shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL); | |
1763 | if (!shdr4extnum) | |
1764 | goto end_coredump; | |
1765 | fill_extnum_info(elf, shdr4extnum, e_shoff, segs); | |
1766 | } | |
1767 | ||
1768 | offset = dataoff; | |
1769 | ||
93eb211e DH |
1770 | size += sizeof(*elf); |
1771 | if (size > cprm->limit || !dump_write(cprm->file, elf, sizeof(*elf))) | |
1772 | goto end_coredump; | |
1773 | ||
1774 | size += sizeof(*phdr4note); | |
1775 | if (size > cprm->limit | |
1776 | || !dump_write(cprm->file, phdr4note, sizeof(*phdr4note))) | |
1777 | goto end_coredump; | |
1778 | ||
6d8c4e3b | 1779 | /* write program headers for segments dump */ |
8feae131 | 1780 | for (vma = current->mm->mmap; vma; vma = vma->vm_next) { |
6d8c4e3b DH |
1781 | struct elf_phdr phdr; |
1782 | size_t sz; | |
1783 | ||
6d8c4e3b DH |
1784 | sz = vma->vm_end - vma->vm_start; |
1785 | ||
1786 | phdr.p_type = PT_LOAD; | |
1787 | phdr.p_offset = offset; | |
1788 | phdr.p_vaddr = vma->vm_start; | |
1789 | phdr.p_paddr = 0; | |
30736a4d | 1790 | phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0; |
6d8c4e3b DH |
1791 | phdr.p_memsz = sz; |
1792 | offset += phdr.p_filesz; | |
1793 | phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0; | |
1794 | if (vma->vm_flags & VM_WRITE) | |
1795 | phdr.p_flags |= PF_W; | |
1796 | if (vma->vm_flags & VM_EXEC) | |
1797 | phdr.p_flags |= PF_X; | |
1798 | phdr.p_align = ELF_EXEC_PAGESIZE; | |
1799 | ||
088e7af7 DH |
1800 | size += sizeof(phdr); |
1801 | if (size > cprm->limit | |
1802 | || !dump_write(cprm->file, &phdr, sizeof(phdr))) | |
1803 | goto end_coredump; | |
6d8c4e3b DH |
1804 | } |
1805 | ||
1fcccbac DH |
1806 | if (!elf_core_write_extra_phdrs(cprm->file, offset, &size, cprm->limit)) |
1807 | goto end_coredump; | |
6d8c4e3b DH |
1808 | |
1809 | /* write out the notes section */ | |
1810 | for (i = 0; i < numnote; i++) | |
05f47fda | 1811 | if (!writenote(notes + i, cprm->file, &foffset)) |
6d8c4e3b DH |
1812 | goto end_coredump; |
1813 | ||
1814 | /* write out the thread status notes section */ | |
1815 | list_for_each(t, &thread_list) { | |
1816 | struct elf_thread_status *tmp = | |
1817 | list_entry(t, struct elf_thread_status, list); | |
1818 | ||
1819 | for (i = 0; i < tmp->num_notes; i++) | |
05f47fda | 1820 | if (!writenote(&tmp->notes[i], cprm->file, &foffset)) |
6d8c4e3b DH |
1821 | goto end_coredump; |
1822 | } | |
1823 | ||
05f47fda | 1824 | if (!dump_seek(cprm->file, dataoff - foffset)) |
f3e8fccd | 1825 | goto end_coredump; |
6d8c4e3b | 1826 | |
f6151dfe | 1827 | if (elf_fdpic_dump_segments(cprm->file, &size, &cprm->limit, |
30736a4d | 1828 | cprm->mm_flags) < 0) |
6d8c4e3b DH |
1829 | goto end_coredump; |
1830 | ||
1fcccbac DH |
1831 | if (!elf_core_write_extra_data(cprm->file, &size, cprm->limit)) |
1832 | goto end_coredump; | |
6d8c4e3b | 1833 | |
8d9032bb DH |
1834 | if (e_phnum == PN_XNUM) { |
1835 | size += sizeof(*shdr4extnum); | |
1836 | if (size > cprm->limit | |
1837 | || !dump_write(cprm->file, shdr4extnum, | |
1838 | sizeof(*shdr4extnum))) | |
1839 | goto end_coredump; | |
1840 | } | |
1841 | ||
2f48912d | 1842 | if (cprm->file->f_pos != offset) { |
6d8c4e3b DH |
1843 | /* Sanity check */ |
1844 | printk(KERN_WARNING | |
1845 | "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n", | |
2f48912d | 1846 | cprm->file->f_pos, offset); |
6d8c4e3b DH |
1847 | } |
1848 | ||
1849 | end_coredump: | |
1850 | set_fs(fs); | |
1851 | ||
1852 | cleanup: | |
1853 | while (!list_empty(&thread_list)) { | |
1854 | struct list_head *tmp = thread_list.next; | |
1855 | list_del(tmp); | |
1856 | kfree(list_entry(tmp, struct elf_thread_status, list)); | |
1857 | } | |
93eb211e | 1858 | kfree(phdr4note); |
6d8c4e3b DH |
1859 | kfree(elf); |
1860 | kfree(prstatus); | |
1861 | kfree(psinfo); | |
1862 | kfree(notes); | |
1863 | kfree(fpu); | |
bcb65a79 | 1864 | kfree(shdr4extnum); |
6d8c4e3b DH |
1865 | #ifdef ELF_CORE_COPY_XFPREGS |
1866 | kfree(xfpu); | |
1867 | #endif | |
1868 | return has_dumped; | |
1869 | #undef NUM_NOTES | |
1870 | } | |
1871 | ||
698ba7b5 | 1872 | #endif /* CONFIG_ELF_CORE */ |