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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* binfmt_elf_fdpic.c: FDPIC ELF binary format
2 *
David Howells8a2ab7f2006-07-10 04:44:53 -07003 * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * 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>
David Howells6d8c4e32006-07-10 04:44:55 -070027#include <linux/pagemap.h>
Paul Mundt5edc2a52008-10-15 22:04:16 -070028#include <linux/security.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/highmem.h>
David Howells6d8c4e32006-07-10 04:44:55 -070030#include <linux/highuid.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/personality.h>
32#include <linux/ptrace.h>
33#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/elf.h>
35#include <linux/elf-fdpic.h>
36#include <linux/elfcore.h>
Daisuke HATAYAMA088e7af2010-03-05 13:44:06 -080037#include <linux/coredump.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <asm/uaccess.h>
40#include <asm/param.h>
41#include <asm/pgalloc.h>
42
43typedef char *elf_caddr_t;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
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
David Howells6d8c4e32006-07-10 04:44:55 -070051#if 0
52#define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
53#else
54#define kdcore(fmt, ...) do {} while(0)
55#endif
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057MODULE_LICENSE("GPL");
58
David Howells8a2ab7f2006-07-10 04:44:53 -070059static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *);
60static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *);
61static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *,
62 struct mm_struct *, const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
David Howells8a2ab7f2006-07-10 04:44:53 -070064static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *,
65 struct elf_fdpic_params *,
66 struct elf_fdpic_params *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68#ifndef CONFIG_MMU
David Howells8a2ab7f2006-07-10 04:44:53 -070069static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *,
70 unsigned long *);
71static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *,
72 struct file *,
73 struct mm_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074#endif
75
David Howells8a2ab7f2006-07-10 04:44:53 -070076static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
77 struct file *, struct mm_struct *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Christoph Hellwig698ba7b2009-12-15 16:47:37 -080079#ifdef CONFIG_ELF_CORE
Masami Hiramatsuf6151df2009-12-17 15:27:16 -080080static int elf_fdpic_core_dump(struct coredump_params *cprm);
David Howells6d8c4e32006-07-10 04:44:55 -070081#endif
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083static struct linux_binfmt elf_fdpic_format = {
84 .module = THIS_MODULE,
85 .load_binary = load_elf_fdpic_binary,
Christoph Hellwig698ba7b2009-12-15 16:47:37 -080086#ifdef CONFIG_ELF_CORE
David Howells6d8c4e32006-07-10 04:44:55 -070087 .core_dump = elf_fdpic_core_dump,
88#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 .min_coredump = ELF_EXEC_PAGESIZE,
90};
91
David Howells8a2ab7f2006-07-10 04:44:53 -070092static int __init init_elf_fdpic_binfmt(void)
93{
Al Viro8fc3dc52012-03-17 03:05:16 -040094 register_binfmt(&elf_fdpic_format);
95 return 0;
David Howells8a2ab7f2006-07-10 04:44:53 -070096}
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
David Howells8a2ab7f2006-07-10 04:44:53 -070098static void __exit exit_elf_fdpic_binfmt(void)
99{
100 unregister_binfmt(&elf_fdpic_format);
101}
102
David Howells6d8c4e32006-07-10 04:44:55 -0700103core_initcall(init_elf_fdpic_binfmt);
David Howells8a2ab7f2006-07-10 04:44:53 -0700104module_exit(exit_elf_fdpic_binfmt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106static 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 */
David Howells8a2ab7f2006-07-10 04:44:53 -0700123static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,
124 struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
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
David Howells8a2ab7f2006-07-10 04:44:53 -0700140 retval = kernel_read(file, params->hdr.e_phoff,
141 (char *) params->phdrs, size);
David Howellse1d2c8b2008-04-29 00:59:34 -0700142 if (unlikely(retval != size))
143 return retval < 0 ? retval : -ENOEXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
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;
David Howells8a2ab7f2006-07-10 04:44:53 -0700161}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163/*****************************************************************************/
164/*
165 * load an fdpic binary into various bits of memory
166 */
David Howells8a2ab7f2006-07-10 04:44:53 -0700167static int load_elf_fdpic_binary(struct linux_binprm *bprm,
168 struct pt_regs *regs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169{
170 struct elf_fdpic_params exec_params, interp_params;
171 struct elf_phdr *phdr;
David Howells8a2ab7f2006-07-10 04:44:53 -0700172 unsigned long stack_size, entryaddr;
David Howells8a2ab7f2006-07-10 04:44:53 -0700173#ifdef ELF_FDPIC_PLAT_INIT
174 unsigned long dynaddr;
175#endif
Mike Frysinger04e4f2b2010-01-06 17:23:17 +0000176#ifndef CONFIG_MMU
177 unsigned long stack_prot;
178#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 struct file *interpreter = NULL; /* to shut gcc up */
180 char *interpreter_name = NULL;
181 int executable_stack;
182 int retval, i;
183
David Howellsaa289b42007-03-23 00:10:00 -0700184 kdebug("____ LOAD %d ____", current->pid);
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 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 */
Jesper Juhl792db3a2006-01-09 20:54:45 -0800216 interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 if (!interpreter_name)
218 goto error;
219
220 retval = kernel_read(bprm->file,
221 phdr->p_offset,
222 interpreter_name,
223 phdr->p_filesz);
David Howellse1d2c8b2008-04-29 00:59:34 -0700224 if (unlikely(retval != phdr->p_filesz)) {
225 if (retval >= 0)
226 retval = -ENOEXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 goto error;
David Howellse1d2c8b2008-04-29 00:59:34 -0700228 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229
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
Alexey Dobriyan1fb84492007-01-26 00:57:16 -0800244 /*
245 * If the binary is not readable then enforce
246 * mm->dumpable = 0 regardless of the interpreter's
247 * permissions.
248 */
Al Viro1b5d7832011-06-19 12:49:47 -0400249 would_dump(bprm, interpreter);
Alexey Dobriyan1fb84492007-01-26 00:57:16 -0800250
David Howells8a2ab7f2006-07-10 04:44:53 -0700251 retval = kernel_read(interpreter, 0, bprm->buf,
252 BINPRM_BUF_SIZE);
David Howellse1d2c8b2008-04-29 00:59:34 -0700253 if (unlikely(retval != BINPRM_BUF_SIZE)) {
254 if (retval >= 0)
255 retval = -ENOEXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 goto error;
David Howellse1d2c8b2008-04-29 00:59:34 -0700257 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 else
295 executable_stack = EXSTACK_DEFAULT;
296
David Howells8e8b63a2009-09-23 15:57:06 -0700297 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 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);
Mike Frysinger04e4f2b2010-01-06 17:23:17 +0000323 if (elf_read_implies_exec(&exec_params.hdr, executable_stack))
324 current->personality |= READ_IMPLIES_EXEC;
Linus Torvalds221af7f2010-01-28 22:14:42 -0800325
326 setup_new_exec(bprm);
327
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338#ifdef CONFIG_MMU
339 elf_fdpic_arch_lay_out_mm(&exec_params,
340 &interp_params,
341 &current->mm->start_stack,
342 &current->mm->start_brk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
David Howells8a2ab7f2006-07-10 04:44:53 -0700344 retval = setup_arg_pages(bprm, current->mm->start_stack,
345 executable_stack);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 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 */
David Howells8a2ab7f2006-07-10 04:44:53 -0700353 retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm,
354 "executable");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 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
David Howells8a2ab7f2006-07-10 04:44:53 -0700375 current->mm->brk = current->mm->start_brk =
376 PAGE_ALIGN(current->mm->start_brk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
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
Mike Frysinger04e4f2b2010-01-06 17:23:17 +0000387 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 down_write(&current->mm->mmap_sem);
Mike Frysinger04e4f2b2010-01-06 17:23:17 +0000393 current->mm->start_brk = do_mmap(NULL, 0, stack_size, stack_prot,
Jie Zhangea637632009-12-14 18:00:02 -0800394 MAP_PRIVATE | MAP_ANONYMOUS |
395 MAP_UNINITIALIZED | MAP_GROWSDOWN,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 0);
397
David Howells8a2ab7f2006-07-10 04:44:53 -0700398 if (IS_ERR_VALUE(current->mm->start_brk)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 up_write(&current->mm->mmap_sem);
400 retval = current->mm->start_brk;
401 current->mm->start_brk = 0;
402 goto error_kill;
403 }
404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 up_write(&current->mm->mmap_sem);
406
407 current->mm->brk = current->mm->start_brk;
408 current->mm->context.end_brk = current->mm->start_brk;
David Howells8a2ab7f2006-07-10 04:44:53 -0700409 current->mm->context.end_brk +=
410 (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 current->mm->start_stack = current->mm->start_brk + stack_size;
412#endif
413
David Howellsa6f76f22008-11-14 10:39:24 +1100414 install_exec_creds(bprm);
David Howells8a2ab7f2006-07-10 04:44:53 -0700415 if (create_elf_fdpic_tables(bprm, current->mm,
416 &exec_params, &interp_params) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 goto error_kill;
418
David Howells8a2ab7f2006-07-10 04:44:53 -0700419 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
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 */
David Howells8a2ab7f2006-07-10 04:44:53 -0700434 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437#endif
438
439 /* everything is now ready... get the userspace context ready to roll */
David Howells8a2ab7f2006-07-10 04:44:53 -0700440 entryaddr = interp_params.entry_addr ?: exec_params.entry_addr;
441 start_thread(regs, entryaddr, current->mm->start_stack);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 retval = 0;
444
445error:
446 if (interpreter) {
447 allow_write_access(interpreter);
448 fput(interpreter);
449 }
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800450 kfree(interpreter_name);
451 kfree(exec_params.phdrs);
452 kfree(exec_params.loadmap);
453 kfree(interp_params.phdrs);
454 kfree(interp_params.loadmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 return retval;
456
457 /* unrecoverable error - kill the process */
David Howells8a2ab7f2006-07-10 04:44:53 -0700458error_kill:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 send_sig(SIGSEGV, current, 0);
460 goto error;
461
David Howells8a2ab7f2006-07-10 04:44:53 -0700462}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463
464/*****************************************************************************/
Paul Mundtec238472008-10-15 22:04:15 -0700465
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475/*
Paul Mundtc7637942008-10-15 22:04:15 -0700476 * present useful information to the program by shovelling it onto the new
477 * process's stack
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 */
479static 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{
David Howells86a264a2008-11-14 10:39:18 +1100484 const struct cred *cred = current_cred();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 unsigned long sp, csp, nitems;
Al Viro530018b2006-06-23 02:04:05 -0700486 elf_caddr_t __user *argv, *envp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 size_t platform_len = 0, len;
Paul Mundtec238472008-10-15 22:04:15 -0700488 char *k_platform, *k_base_platform;
489 char __user *u_platform, *u_base_platform, *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 long hwcap;
491 int loop;
Paul Mundt9b14ec32008-05-19 13:34:45 +0900492 int nr; /* reset for each csp adjustment */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494#ifdef CONFIG_MMU
Paul Mundtc7637942008-10-15 22:04:15 -0700495 /* 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501#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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 hwcap = ELF_HWCAP;
Paul Mundtec238472008-10-15 22:04:15 -0700510
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 k_platform = ELF_PLATFORM;
David Howells1aeb21d2006-07-10 04:44:50 -0700518 u_platform = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
520 if (k_platform) {
521 platform_len = strlen(k_platform) + 1;
522 sp -= platform_len;
Al Viro530018b2006-06-23 02:04:05 -0700523 u_platform = (char __user *) sp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 if (__copy_to_user(u_platform, k_platform, platform_len) != 0)
525 return -EFAULT;
526 }
527
Paul Mundtec238472008-10-15 22:04:15 -0700528 /*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 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
Al Viro530018b2006-06-23 02:04:05 -0700551 if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 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);
David Howells8a2ab7f2006-07-10 04:44:53 -0700558 len += sizeof(struct elf32_fdpic_loadseg) *
559 interp_params->loadmap->nsegs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 sp = (sp - len) & ~7UL;
561 interp_params->map_addr = sp;
562
David Howells8a2ab7f2006-07-10 04:44:53 -0700563 if (copy_to_user((void __user *) sp, interp_params->loadmap,
564 len) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 return -EFAULT;
566
567 current->mm->context.interp_fdpic_loadmap = (unsigned long) sp;
568 }
569
570 /* force 16 byte _final_ alignment here for generality */
Paul Mundt5edc2a52008-10-15 22:04:16 -0700571#define DLINFO_ITEMS 15
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Paul Mundtec238472008-10-15 22:04:15 -0700573 nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) +
574 (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Paul Mundt5edc2a52008-10-15 22:04:16 -0700576 if (bprm->interp_flags & BINPRM_FLAGS_EXECFD)
577 nitems++;
578
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 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 */
Paul Mundt9b14ec32008-05-19 13:34:45 +0900589#define NEW_AUX_ENT(id, val) \
David Howells8a2ab7f2006-07-10 04:44:53 -0700590 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); \
Paul Mundt9b14ec32008-05-19 13:34:45 +0900596 nr++; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 } while (0)
598
Paul Mundt9b14ec32008-05-19 13:34:45 +0900599 nr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 csp -= 2 * sizeof(unsigned long);
Paul Mundt9b14ec32008-05-19 13:34:45 +0900601 NEW_AUX_ENT(AT_NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 if (k_platform) {
Paul Mundt9b14ec32008-05-19 13:34:45 +0900603 nr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 csp -= 2 * sizeof(unsigned long);
Paul Mundt9b14ec32008-05-19 13:34:45 +0900605 NEW_AUX_ENT(AT_PLATFORM,
David Howells8a2ab7f2006-07-10 04:44:53 -0700606 (elf_addr_t) (unsigned long) u_platform);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 }
608
Paul Mundtec238472008-10-15 22:04:15 -0700609 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
Paul Mundt5edc2a52008-10-15 22:04:16 -0700616 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
Paul Mundt9b14ec32008-05-19 13:34:45 +0900622 nr = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long);
Paul Mundt9b14ec32008-05-19 13:34:45 +0900624 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);
David Howells86a264a2008-11-14 10:39:18 +1100633 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);
Paul Mundt5edc2a52008-10-15 22:04:16 -0700637 NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
638 NEW_AUX_ENT(AT_EXECFN, bprm->exec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
640#ifdef ARCH_DLINFO
Paul Mundt9b14ec32008-05-19 13:34:45 +0900641 nr = 0;
642 csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long);
643
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 /* 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);
Al Viro530018b2006-06-23 02:04:05 -0700653 envp = (elf_caddr_t __user *) csp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 csp -= (bprm->argc + 1) * sizeof(elf_caddr_t);
Al Viro530018b2006-06-23 02:04:05 -0700655 argv = (elf_caddr_t __user *) csp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
657 /* stack argc */
658 csp -= sizeof(unsigned long);
Al Viro530018b2006-06-23 02:04:05 -0700659 __put_user(bprm->argc, (unsigned long __user *) csp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
Eric Sesterhenn88bcd512006-03-24 18:38:48 +0100661 BUG_ON(csp != sp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
663 /* fill in the argv[] array */
664#ifdef CONFIG_MMU
665 current->mm->arg_start = bprm->p;
666#else
David Howells8a2ab7f2006-07-10 04:44:53 -0700667 current->mm->arg_start = current->mm->start_stack -
668 (MAX_ARG_PAGES * PAGE_SIZE - bprm->p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669#endif
670
Al Viro530018b2006-06-23 02:04:05 -0700671 p = (char __user *) current->mm->arg_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 for (loop = bprm->argc; loop > 0; loop--) {
673 __put_user((elf_caddr_t) p, argv++);
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700674 len = strnlen_user(p, MAX_ARG_STRLEN);
675 if (!len || len > MAX_ARG_STRLEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 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++);
Ollie Wildb6a2fea2007-07-19 01:48:16 -0700686 len = strnlen_user(p, MAX_ARG_STRLEN);
687 if (!len || len > MAX_ARG_STRLEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 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;
David Howells8a2ab7f2006-07-10 04:44:53 -0700696}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
698/*****************************************************************************/
699/*
700 * transfer the program arguments and environment from the holding pages onto
701 * the stack
702 */
703#ifndef CONFIG_MMU
David Howells8a2ab7f2006-07-10 04:44:53 -0700704static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm,
705 unsigned long *_sp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706{
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
David Howells8a2ab7f2006-07-10 04:44:53 -0700726out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 return ret;
David Howells8a2ab7f2006-07-10 04:44:53 -0700728}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729#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 */
742static 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);
Robert P. J. Dayb87576d2006-12-12 20:07:35 +0100768 loadmap = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 if (!loadmap)
770 return -ENOMEM;
771
772 params->loadmap = loadmap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
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 &&
David Howells8a2ab7f2006-07-10 04:44:53 -0700802 params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 params->entry_addr =
David Howells8a2ab7f2006-07-10 04:44:53 -0700804 (params->hdr.e_entry - seg->p_vaddr) +
805 seg->addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 break;
807 }
808 }
809 }
810
811 /* determine where the program header table has wound up if mapped */
David Howells8a2ab7f2006-07-10 04:44:53 -0700812 stop = params->hdr.e_phoff;
813 stop += params->hdr.e_phnum * sizeof (struct elf_phdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 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 &&
David Howells8a2ab7f2006-07-10 04:44:53 -0700827 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 +
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 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 &&
David Howells8a2ab7f2006-07-10 04:44:53 -0700848 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
David Howells8a2ab7f2006-07-10 04:44:53 -0700854 /* check the dynamic section contains at least
855 * one item, and that the last item is a NULL
856 * entry */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 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);
David Howells8a2ab7f2006-07-10 04:44:53 -0700862 if (((Elf32_Dyn *)
863 params->dynamic_addr)[tmp - 1].d_tag != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 goto dynamic_error;
865 break;
866 }
867 }
868 break;
869 }
870
871 /* now elide adjacent segments in the load map on MMU linux
David Howells8a2ab7f2006-07-10 04:44:53 -0700872 * - on uClinux the holes between may actually be filled with system
873 * stuff or stuff from other processes
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 */
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)) {
David Howells8a2ab7f2006-07-10 04:44:53 -0700884 mseg->p_memsz +=
885 load_addr -
886 (mseg->addr + mseg->p_memsz);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 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
David Howells8a2ab7f2006-07-10 04:44:53 -0700914dynamic_error:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n",
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -0800916 what, file->f_path.dentry->d_inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 return -ELIBBAD;
David Howells8a2ab7f2006-07-10 04:44:53 -0700918}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919
920/*****************************************************************************/
921/*
922 * map a file with constant displacement under uClinux
923 */
924#ifndef CONFIG_MMU
David Howells8a2ab7f2006-07-10 04:44:53 -0700925static int elf_fdpic_map_file_constdisp_on_uclinux(
926 struct elf_fdpic_params *params,
927 struct file *file,
928 struct mm_struct *mm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929{
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
David Howells8a2ab7f2006-07-10 04:44:53 -0700939 /* determine the bounds of the contiguous overall allocation we must
940 * make */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 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);
David Howells8a2ab7f2006-07-10 04:44:53 -0700961 if (IS_ERR_VALUE(maddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 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
David Howells8a2ab7f2006-07-10 04:44:53 -0700979 ret = file->f_op->read(file, (void *) seg->addr,
980 phdr->p_filesz, &fpos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 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 */
Mike Frysingerab4ad552009-04-02 16:58:28 -0700989 if (phdr->p_filesz < phdr->p_memsz) {
Takuya Yoshikawae30c7c32010-06-01 14:10:47 +0100990 if (clear_user((void *) (seg->addr + phdr->p_filesz),
991 phdr->p_memsz - phdr->p_filesz))
992 return -EFAULT;
Mike Frysingerab4ad552009-04-02 16:58:28 -0700993 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994
995 if (mm) {
996 if (phdr->p_flags & PF_X) {
David Howellsaa289b42007-03-23 00:10:00 -0700997 if (!mm->start_code) {
998 mm->start_code = seg->addr;
999 mm->end_code = seg->addr +
1000 phdr->p_memsz;
1001 }
David Howells8a2ab7f2006-07-10 04:44:53 -07001002 } else if (!mm->start_data) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 mm->start_data = seg->addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 mm->end_data = seg->addr + phdr->p_memsz;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 }
1007
1008 seg++;
1009 }
1010
1011 return 0;
David Howells8a2ab7f2006-07-10 04:44:53 -07001012}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013#endif
1014
1015/*****************************************************************************/
1016/*
1017 * map a binary by direct mmap() of the individual PT_LOAD segments
1018 */
1019static 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;
Takuya Yoshikawae30c7c32010-06-01 14:10:47 +01001026 int loop, dvset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027
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
David Howells8a2ab7f2006-07-10 04:44:53 -07001073 * - can be mapped anywhere, but must be mapped as a
1074 * unit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 */
1076 if (!dvset) {
1077 maddr = load_addr;
1078 delta_vaddr = phdr->p_vaddr;
1079 dvset = 1;
David Howells8a2ab7f2006-07-10 04:44:53 -07001080 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 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",
David Howells8a2ab7f2006-07-10 04:44:53 -07001104 loop, phdr->p_memsz + disp, prot, flags,
1105 phdr->p_offset - disp, maddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106
David Howells8a2ab7f2006-07-10 04:44:53 -07001107 if (IS_ERR_VALUE(maddr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 return (int) maddr;
1109
David Howells8a2ab7f2006-07-10 04:44:53 -07001110 if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
1111 ELF_FDPIC_FLAG_CONTIGUOUS)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 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
David Howells8a2ab7f2006-07-10 04:44:53 -07001122 /* clear the bit between beginning of mapping and beginning of
1123 * PT_LOAD */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 if (prot & PROT_WRITE && disp > 0) {
1125 kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp);
Takuya Yoshikawae30c7c32010-06-01 14:10:47 +01001126 if (clear_user((void __user *) maddr, disp))
1127 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 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
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 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);
David Howells8a2ab7f2006-07-10 04:44:53 -07001146 xmaddr = do_mmap(NULL, xaddr, excess - excess1,
1147 prot, flags, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 up_write(&mm->mmap_sem);
1149
1150 kdebug("mmap[%d] <anon>"
1151 " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx",
David Howells8a2ab7f2006-07-10 04:44:53 -07001152 loop, xaddr, excess - excess1, prot, flags,
1153 xmaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154
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);
Takuya Yoshikawae30c7c32010-06-01 14:10:47 +01001162 if (clear_user((void __user *) maddr + phdr->p_filesz,
1163 excess1))
1164 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 }
1166
1167#else
1168 if (excess > 0) {
1169 kdebug("clear[%d] ad=%lx sz=%lx",
1170 loop, maddr + phdr->p_filesz, excess);
Takuya Yoshikawae30c7c32010-06-01 14:10:47 +01001171 if (clear_user((void *) maddr + phdr->p_filesz, excess))
1172 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 }
1174#endif
1175
1176 if (mm) {
1177 if (phdr->p_flags & PF_X) {
David Howellsaa289b42007-03-23 00:10:00 -07001178 if (!mm->start_code) {
1179 mm->start_code = maddr;
1180 mm->end_code = maddr + phdr->p_memsz;
1181 }
David Howells8a2ab7f2006-07-10 04:44:53 -07001182 } else if (!mm->start_data) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 mm->start_data = maddr;
1184 mm->end_data = maddr + phdr->p_memsz;
1185 }
1186 }
1187
1188 seg++;
1189 }
1190
1191 return 0;
David Howells8a2ab7f2006-07-10 04:44:53 -07001192}
David Howells6d8c4e32006-07-10 04:44:55 -07001193
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 */
Christoph Hellwig698ba7b2009-12-15 16:47:37 -08001203#ifdef CONFIG_ELF_CORE
David Howells6d8c4e32006-07-10 04:44:55 -07001204
1205/*
David Howells6d8c4e32006-07-10 04:44:55 -07001206 * 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 */
Kawai, Hidehiroee78b0a2007-07-19 01:48:30 -07001212static int maydump(struct vm_area_struct *vma, unsigned long mm_flags)
David Howells6d8c4e32006-07-10 04:44:55 -07001213{
Kawai, Hidehiroee78b0a2007-07-19 01:48:30 -07001214 int dump_ok;
1215
David Howells6d8c4e32006-07-10 04:44:55 -07001216 /* 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
Kawai, Hidehiroee78b0a2007-07-19 01:48:30 -07001230 /* By default, dump shared memory if mapped from an anonymous file. */
David Howells6d8c4e32006-07-10 04:44:55 -07001231 if (vma->vm_flags & VM_SHARED) {
Josef "Jeff" Sipek0f7fc9e2006-12-08 02:36:35 -08001232 if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0) {
Kawai, Hidehiroee78b0a2007-07-19 01:48:30 -07001233 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;
David Howells6d8c4e32006-07-10 04:44:55 -07001237 }
1238
Kawai, Hidehiroee78b0a2007-07-19 01:48:30 -07001239 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;
David Howells6d8c4e32006-07-10 04:44:55 -07001243 }
1244
1245#ifdef CONFIG_MMU
Kawai, Hidehiroee78b0a2007-07-19 01:48:30 -07001246 /* By default, if it hasn't been written to, don't write it out */
David Howells6d8c4e32006-07-10 04:44:55 -07001247 if (!vma->anon_vma) {
Kawai, Hidehiroee78b0a2007-07-19 01:48:30 -07001248 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;
David Howells6d8c4e32006-07-10 04:44:55 -07001252 }
1253#endif
1254
Kawai, Hidehiroee78b0a2007-07-19 01:48:30 -07001255 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;
David Howells6d8c4e32006-07-10 04:44:55 -07001259}
1260
1261/* An ELF note in memory */
1262struct memelfnote
1263{
1264 const char *name;
1265 int type;
1266 unsigned int datasz;
1267 void *data;
1268};
1269
1270static 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
Daisuke HATAYAMA05f47fd2010-03-05 13:44:05 -08001283#define DUMP_WRITE(addr, nr, foffset) \
1284 do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0)
David Howells6d8c4e32006-07-10 04:44:55 -07001285
Daisuke HATAYAMA05f47fd2010-03-05 13:44:05 -08001286static int alignfile(struct file *file, loff_t *foffset)
1287{
1288 static const char buf[4] = { 0, };
1289 DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset);
1290 return 1;
1291}
1292
1293static int writenote(struct memelfnote *men, struct file *file,
1294 loff_t *foffset)
David Howells6d8c4e32006-07-10 04:44:55 -07001295{
1296 struct elf_note en;
David Howells6d8c4e32006-07-10 04:44:55 -07001297 en.n_namesz = strlen(men->name) + 1;
1298 en.n_descsz = men->datasz;
1299 en.n_type = men->type;
1300
Daisuke HATAYAMA05f47fd2010-03-05 13:44:05 -08001301 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;
David Howells6d8c4e32006-07-10 04:44:55 -07001308
1309 return 1;
1310}
1311#undef DUMP_WRITE
David Howells6d8c4e32006-07-10 04:44:55 -07001312
David Howells6d8c4e32006-07-10 04:44:55 -07001313static 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
1338static 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
1351static 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
Daniel Mack3ad2f3f2010-02-03 08:01:28 +08001363 * registers which need to be filled up separately.
David Howells6d8c4e32006-07-10 04:44:55 -07001364 */
1365static 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];
Oleg Nesterov3b34fc52009-06-17 16:27:38 -07001371 rcu_read_lock();
1372 prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1373 rcu_read_unlock();
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001374 prstatus->pr_pid = task_pid_vnr(p);
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001375 prstatus->pr_pgrp = task_pgrp_vnr(p);
1376 prstatus->pr_sid = task_session_vnr(p);
David Howells6d8c4e32006-07-10 04:44:55 -07001377 if (thread_group_leader(p)) {
Paul Mundt2515ddc2008-10-21 12:07:40 +09001378 struct task_cputime cputime;
1379
David Howells6d8c4e32006-07-10 04:44:55 -07001380 /*
Paul Mundt2515ddc2008-10-21 12:07:40 +09001381 * This is the record for the group leader. It shows the
1382 * group-wide total, not its individual thread total.
David Howells6d8c4e32006-07-10 04:44:55 -07001383 */
Paul Mundt2515ddc2008-10-21 12:07:40 +09001384 thread_group_cputime(p, &cputime);
1385 cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
1386 cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
David Howells6d8c4e32006-07-10 04:44:55 -07001387 } 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
1398static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1399 struct mm_struct *mm)
1400{
David Howellsc69e8d92008-11-14 10:39:19 +11001401 const struct cred *cred;
David Howells6d8c4e32006-07-10 04:44:55 -07001402 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
Oleg Nesterov3b34fc52009-06-17 16:27:38 -07001418 rcu_read_lock();
1419 psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1420 rcu_read_unlock();
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001421 psinfo->pr_pid = task_pid_vnr(p);
Pavel Emelyanovb4888932007-10-18 23:40:14 -07001422 psinfo->pr_pgrp = task_pgrp_vnr(p);
1423 psinfo->pr_sid = task_session_vnr(p);
David Howells6d8c4e32006-07-10 04:44:55 -07001424
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;
David Howellsc69e8d92008-11-14 10:39:19 +11001431 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();
David Howells6d8c4e32006-07-10 04:44:55 -07001436 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. */
1442struct 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
Mark Nelson5b20cd82007-10-16 23:25:39 -07001449 elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */
David Howells6d8c4e32006-07-10 04:44:55 -07001450#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 */
1460static 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)) {
Mark Nelson5b20cd82007-10-16 23:25:39 -07001485 fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
1486 sizeof(t->xfpu), &t->xfpu);
David Howells6d8c4e32006-07-10 04:44:55 -07001487 t->num_notes++;
1488 sz += notesize(&t->notes[2]);
1489 }
1490#endif
1491 return sz;
1492}
1493
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08001494static 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
David Howells6d8c4e32006-07-10 04:44:55 -07001510/*
1511 * dump the segments for an MMU process
1512 */
1513#ifdef CONFIG_MMU
Kawai, Hidehiroe2e00902007-07-19 01:48:30 -07001514static int elf_fdpic_dump_segments(struct file *file, size_t *size,
Kawai, Hidehiroee78b0a2007-07-19 01:48:30 -07001515 unsigned long *limit, unsigned long mm_flags)
David Howells6d8c4e32006-07-10 04:44:55 -07001516{
1517 struct vm_area_struct *vma;
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07001518 int err = 0;
David Howells6d8c4e32006-07-10 04:44:55 -07001519
1520 for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1521 unsigned long addr;
1522
Kawai, Hidehiroee78b0a2007-07-19 01:48:30 -07001523 if (!maydump(vma, mm_flags))
David Howells6d8c4e32006-07-10 04:44:55 -07001524 continue;
1525
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07001526 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;
David Howells6d8c4e32006-07-10 04:44:55 -07001536 kunmap(page);
1537 page_cache_release(page);
Daisuke HATAYAMA05f47fd2010-03-05 13:44:05 -08001538 } else if (!dump_seek(file, PAGE_SIZE))
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07001539 err = -EFBIG;
1540 if (err)
1541 goto out;
David Howells6d8c4e32006-07-10 04:44:55 -07001542 }
1543 }
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07001544out:
1545 return err;
David Howells6d8c4e32006-07-10 04:44:55 -07001546}
1547#endif
1548
1549/*
1550 * dump the segments for a NOMMU process
1551 */
1552#ifndef CONFIG_MMU
Kawai, Hidehiroe2e00902007-07-19 01:48:30 -07001553static int elf_fdpic_dump_segments(struct file *file, size_t *size,
Kawai, Hidehiroee78b0a2007-07-19 01:48:30 -07001554 unsigned long *limit, unsigned long mm_flags)
David Howells6d8c4e32006-07-10 04:44:55 -07001555{
David Howells8feae132009-01-08 12:04:47 +00001556 struct vm_area_struct *vma;
David Howells6d8c4e32006-07-10 04:44:55 -07001557
David Howells8feae132009-01-08 12:04:47 +00001558 for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
Kawai, Hidehiroee78b0a2007-07-19 01:48:30 -07001559 if (!maydump(vma, mm_flags))
David Howells6d8c4e32006-07-10 04:44:55 -07001560 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
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08001574static size_t elf_core_vma_data_size(unsigned long mm_flags)
1575{
1576 struct vm_area_struct *vma;
1577 size_t size = 0;
1578
David Howells47568d42010-03-24 17:02:28 +00001579 for (vma = current->mm->mmap; vma; vma = vma->vm_next)
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08001580 if (maydump(vma, mm_flags))
1581 size += vma->vm_end - vma->vm_start;
1582 return size;
1583}
1584
David Howells6d8c4e32006-07-10 04:44:55 -07001585/*
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 */
Masami Hiramatsuf6151df2009-12-17 15:27:16 -08001592static int elf_fdpic_core_dump(struct coredump_params *cprm)
David Howells6d8c4e32006-07-10 04:44:55 -07001593{
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;
Daisuke HATAYAMA05f47fd2010-03-05 13:44:05 -08001602 loff_t offset = 0, dataoff, foffset;
David Howells6d8c4e32006-07-10 04:44:55 -07001603 int numnote;
1604 struct memelfnote *notes = NULL;
1605 struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
1606 struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
David Howells6d8c4e32006-07-10 04:44:55 -07001607 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;
David Howells6d8c4e32006-07-10 04:44:55 -07001614 elf_addr_t *auxv;
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08001615 struct elf_phdr *phdr4note = NULL;
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08001616 struct elf_shdr *shdr4extnum = NULL;
1617 Elf_Half e_phnum;
1618 elf_addr_t e_shoff;
David Howells6d8c4e32006-07-10 04:44:55 -07001619
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
Masami Hiramatsuf6151df2009-12-17 15:27:16 -08001654 if (cprm->signr) {
Oleg Nesterov182c5152008-07-25 01:47:45 -07001655 struct core_thread *ct;
David Howells6d8c4e32006-07-10 04:44:55 -07001656 struct elf_thread_status *tmp;
Oleg Nesterov24d52882008-07-25 01:47:40 -07001657
Oleg Nesterov182c5152008-07-25 01:47:45 -07001658 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
David Howells6d8c4e32006-07-10 04:44:55 -07001668 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);
Masami Hiramatsuf6151df2009-12-17 15:27:16 -08001673 sz = elf_dump_thread_status(cprm->signr, tmp);
David Howells6d8c4e32006-07-10 04:44:55 -07001674 thread_status_size += sz;
1675 }
1676 }
1677
1678 /* now collect the dump for the current */
Masami Hiramatsuf6151df2009-12-17 15:27:16 -08001679 fill_prstatus(prstatus, current, cprm->signr);
1680 elf_core_copy_regs(&prstatus->pr_reg, cprm->regs);
David Howells6d8c4e32006-07-10 04:44:55 -07001681
David Howells6d8c4e32006-07-10 04:44:55 -07001682 segs = current->mm->map_count;
Daisuke HATAYAMA1fcccba2010-03-05 13:44:07 -08001683 segs += elf_core_extra_phdrs();
David Howells6d8c4e32006-07-10 04:44:55 -07001684
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08001685 /* 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
David Howells6d8c4e32006-07-10 04:44:55 -07001693 /* Set up header */
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08001694 fill_elf_fdpic_header(elf, e_phnum);
David Howells6d8c4e32006-07-10 04:44:55 -07001695
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(&notes[numnote++], "CORE", NT_AUXV,
1717 i * sizeof(elf_addr_t), auxv);
1718
1719 /* Try to dump the FPU. */
1720 if ((prstatus->pr_fpvalid =
Masami Hiramatsuf6151df2009-12-17 15:27:16 -08001721 elf_core_copy_task_fpregs(current, cprm->regs, fpu)))
David Howells6d8c4e32006-07-10 04:44:55 -07001722 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++,
Mark Nelson5b20cd82007-10-16 23:25:39 -07001727 "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu);
David Howells6d8c4e32006-07-10 04:44:55 -07001728#endif
1729
1730 fs = get_fs();
1731 set_fs(KERNEL_DS);
1732
David Howells6d8c4e32006-07-10 04:44:55 -07001733 offset += sizeof(*elf); /* Elf header */
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08001734 offset += segs * sizeof(struct elf_phdr); /* Program headers */
Daisuke HATAYAMA05f47fd2010-03-05 13:44:05 -08001735 foffset = offset;
David Howells6d8c4e32006-07-10 04:44:55 -07001736
1737 /* Write notes phdr entry */
1738 {
David Howells6d8c4e32006-07-10 04:44:55 -07001739 int sz = 0;
1740
1741 for (i = 0; i < numnote; i++)
1742 sz += notesize(notes + i);
1743
1744 sz += thread_status_size;
1745
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08001746 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
1747 if (!phdr4note)
Daisuke HATAYAMA088e7af2010-03-05 13:44:06 -08001748 goto end_coredump;
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08001749
1750 fill_elf_note_phdr(phdr4note, sz, offset);
1751 offset += sz;
David Howells6d8c4e32006-07-10 04:44:55 -07001752 }
1753
1754 /* Page-align dumped data */
1755 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1756
Masami Hiramatsu30736a42010-03-05 13:44:12 -08001757 offset += elf_core_vma_data_size(cprm->mm_flags);
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08001758 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
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08001770 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
David Howells6d8c4e32006-07-10 04:44:55 -07001779 /* write program headers for segments dump */
David Howells8feae132009-01-08 12:04:47 +00001780 for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
David Howells6d8c4e32006-07-10 04:44:55 -07001781 struct elf_phdr phdr;
1782 size_t sz;
1783
David Howells6d8c4e32006-07-10 04:44:55 -07001784 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;
Masami Hiramatsu30736a42010-03-05 13:44:12 -08001790 phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0;
David Howells6d8c4e32006-07-10 04:44:55 -07001791 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
Daisuke HATAYAMA088e7af2010-03-05 13:44:06 -08001800 size += sizeof(phdr);
1801 if (size > cprm->limit
1802 || !dump_write(cprm->file, &phdr, sizeof(phdr)))
1803 goto end_coredump;
David Howells6d8c4e32006-07-10 04:44:55 -07001804 }
1805
Daisuke HATAYAMA1fcccba2010-03-05 13:44:07 -08001806 if (!elf_core_write_extra_phdrs(cprm->file, offset, &size, cprm->limit))
1807 goto end_coredump;
David Howells6d8c4e32006-07-10 04:44:55 -07001808
1809 /* write out the notes section */
1810 for (i = 0; i < numnote; i++)
Daisuke HATAYAMA05f47fd2010-03-05 13:44:05 -08001811 if (!writenote(notes + i, cprm->file, &foffset))
David Howells6d8c4e32006-07-10 04:44:55 -07001812 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++)
Daisuke HATAYAMA05f47fd2010-03-05 13:44:05 -08001820 if (!writenote(&tmp->notes[i], cprm->file, &foffset))
David Howells6d8c4e32006-07-10 04:44:55 -07001821 goto end_coredump;
1822 }
1823
Daisuke HATAYAMA05f47fd2010-03-05 13:44:05 -08001824 if (!dump_seek(cprm->file, dataoff - foffset))
Hugh Dickinsf3e8fcc2009-09-21 17:03:25 -07001825 goto end_coredump;
David Howells6d8c4e32006-07-10 04:44:55 -07001826
Masami Hiramatsuf6151df2009-12-17 15:27:16 -08001827 if (elf_fdpic_dump_segments(cprm->file, &size, &cprm->limit,
Masami Hiramatsu30736a42010-03-05 13:44:12 -08001828 cprm->mm_flags) < 0)
David Howells6d8c4e32006-07-10 04:44:55 -07001829 goto end_coredump;
1830
Daisuke HATAYAMA1fcccba2010-03-05 13:44:07 -08001831 if (!elf_core_write_extra_data(cprm->file, &size, cprm->limit))
1832 goto end_coredump;
David Howells6d8c4e32006-07-10 04:44:55 -07001833
Daisuke HATAYAMA8d9032b2010-03-05 13:44:10 -08001834 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
Daisuke HATAYAMA2f489122010-01-04 15:42:14 +09001842 if (cprm->file->f_pos != offset) {
David Howells6d8c4e32006-07-10 04:44:55 -07001843 /* Sanity check */
1844 printk(KERN_WARNING
1845 "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
Daisuke HATAYAMA2f489122010-01-04 15:42:14 +09001846 cprm->file->f_pos, offset);
David Howells6d8c4e32006-07-10 04:44:55 -07001847 }
1848
1849end_coredump:
1850 set_fs(fs);
1851
1852cleanup:
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 }
Daisuke HATAYAMA93eb2112010-03-05 13:44:09 -08001858 kfree(phdr4note);
David Howells6d8c4e32006-07-10 04:44:55 -07001859 kfree(elf);
1860 kfree(prstatus);
1861 kfree(psinfo);
1862 kfree(notes);
1863 kfree(fpu);
Davidlohr Buesobcb65a72011-07-06 12:26:05 +01001864 kfree(shdr4extnum);
David Howells6d8c4e32006-07-10 04:44:55 -07001865#ifdef ELF_CORE_COPY_XFPREGS
1866 kfree(xfpu);
1867#endif
1868 return has_dumped;
1869#undef NUM_NOTES
1870}
1871
Christoph Hellwig698ba7b2009-12-15 16:47:37 -08001872#endif /* CONFIG_ELF_CORE */