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Xilinx: ARM: USB: Fixed kernel crash with OTG driver.
[linux-2.6-xlnx.git] / fs / binfmt_elf.c
blob1b52956afe33ab07889c3963ce2c41b32133483b
1 /*
2 * linux/fs/binfmt_elf.c
3 *
4 * These are the functions used to load ELF format executables as used
5 * on SVr4 machines. Information on the format may be found in the book
6 * "UNIX SYSTEM V RELEASE 4 Programmers Guide: Ansi C and Programming Support
7 * Tools".
8 *
9 * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).
10 */
11
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/fs.h>
15 #include <linux/mm.h>
16 #include <linux/mman.h>
17 #include <linux/errno.h>
18 #include <linux/signal.h>
19 #include <linux/binfmts.h>
20 #include <linux/string.h>
21 #include <linux/file.h>
22 #include <linux/slab.h>
23 #include <linux/personality.h>
24 #include <linux/elfcore.h>
25 #include <linux/init.h>
26 #include <linux/highuid.h>
27 #include <linux/compiler.h>
28 #include <linux/highmem.h>
29 #include <linux/pagemap.h>
30 #include <linux/security.h>
31 #include <linux/random.h>
32 #include <linux/elf.h>
33 #include <linux/utsname.h>
34 #include <linux/coredump.h>
35 #include <asm/uaccess.h>
36 #include <asm/param.h>
37 #include <asm/page.h>
38 #include <asm/exec.h>
39
40 static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs);
41 static int load_elf_library(struct file *);
42 static unsigned long elf_map(struct file *, unsigned long, struct elf_phdr *,
43 int, int, unsigned long);
44
45 /*
46 * If we don't support core dumping, then supply a NULL so we
47 * don't even try.
48 */
49 #ifdef CONFIG_ELF_CORE
50 static int elf_core_dump(struct coredump_params *cprm);
51 #else
52 #define elf_core_dump NULL
53 #endif
54
55 #if ELF_EXEC_PAGESIZE > PAGE_SIZE
56 #define ELF_MIN_ALIGN ELF_EXEC_PAGESIZE
57 #else
58 #define ELF_MIN_ALIGN PAGE_SIZE
59 #endif
60
61 #ifndef ELF_CORE_EFLAGS
62 #define ELF_CORE_EFLAGS 0
63 #endif
64
65 #define ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(ELF_MIN_ALIGN-1))
66 #define ELF_PAGEOFFSET(_v) ((_v) & (ELF_MIN_ALIGN-1))
67 #define ELF_PAGEALIGN(_v) (((_v) + ELF_MIN_ALIGN - 1) & ~(ELF_MIN_ALIGN - 1))
68
69 static struct linux_binfmt elf_format = {
70 .module = THIS_MODULE,
71 .load_binary = load_elf_binary,
72 .load_shlib = load_elf_library,
73 .core_dump = elf_core_dump,
74 .min_coredump = ELF_EXEC_PAGESIZE,
75 };
76
77 #define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
78
79 static int set_brk(unsigned long start, unsigned long end)
80 {
81 start = ELF_PAGEALIGN(start);
82 end = ELF_PAGEALIGN(end);
83 if (end > start) {
84 unsigned long addr;
85 addr = vm_brk(start, end - start);
86 if (BAD_ADDR(addr))
87 return addr;
88 }
89 current->mm->start_brk = current->mm->brk = end;
90 return 0;
91 }
92
93 /* We need to explicitly zero any fractional pages
94 after the data section (i.e. bss). This would
95 contain the junk from the file that should not
96 be in memory
97 */
98 static int padzero(unsigned long elf_bss)
99 {
100 unsigned long nbyte;
101
102 nbyte = ELF_PAGEOFFSET(elf_bss);
103 if (nbyte) {
104 nbyte = ELF_MIN_ALIGN - nbyte;
105 if (clear_user((void __user *) elf_bss, nbyte))
106 return -EFAULT;
107 }
108 return 0;
109 }
110
111 /* Let's use some macros to make this stack manipulation a little clearer */
112 #ifdef CONFIG_STACK_GROWSUP
113 #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) + (items))
114 #define STACK_ROUND(sp, items) \
115 ((15 + (unsigned long) ((sp) + (items))) &~ 15UL)
116 #define STACK_ALLOC(sp, len) ({ \
117 elf_addr_t __user *old_sp = (elf_addr_t __user *)sp; sp += len; \
118 old_sp; })
119 #else
120 #define STACK_ADD(sp, items) ((elf_addr_t __user *)(sp) - (items))
121 #define STACK_ROUND(sp, items) \
122 (((unsigned long) (sp - items)) &~ 15UL)
123 #define STACK_ALLOC(sp, len) ({ sp -= len ; sp; })
124 #endif
125
126 #ifndef ELF_BASE_PLATFORM
127 /*
128 * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
129 * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
130 * will be copied to the user stack in the same manner as AT_PLATFORM.
131 */
132 #define ELF_BASE_PLATFORM NULL
133 #endif
134
135 static int
136 create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
137 unsigned long load_addr, unsigned long interp_load_addr)
138 {
139 unsigned long p = bprm->p;
140 int argc = bprm->argc;
141 int envc = bprm->envc;
142 elf_addr_t __user *argv;
143 elf_addr_t __user *envp;
144 elf_addr_t __user *sp;
145 elf_addr_t __user *u_platform;
146 elf_addr_t __user *u_base_platform;
147 elf_addr_t __user *u_rand_bytes;
148 const char *k_platform = ELF_PLATFORM;
149 const char *k_base_platform = ELF_BASE_PLATFORM;
150 unsigned char k_rand_bytes[16];
151 int items;
152 elf_addr_t *elf_info;
153 int ei_index = 0;
154 const struct cred *cred = current_cred();
155 struct vm_area_struct *vma;
156
157 /*
158 * In some cases (e.g. Hyper-Threading), we want to avoid L1
159 * evictions by the processes running on the same package. One
160 * thing we can do is to shuffle the initial stack for them.
161 */
162
163 p = arch_align_stack(p);
164
165 /*
166 * If this architecture has a platform capability string, copy it
167 * to userspace. In some cases (Sparc), this info is impossible
168 * for userspace to get any other way, in others (i386) it is
169 * merely difficult.
170 */
171 u_platform = NULL;
172 if (k_platform) {
173 size_t len = strlen(k_platform) + 1;
174
175 u_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
176 if (__copy_to_user(u_platform, k_platform, len))
177 return -EFAULT;
178 }
179
180 /*
181 * If this architecture has a "base" platform capability
182 * string, copy it to userspace.
183 */
184 u_base_platform = NULL;
185 if (k_base_platform) {
186 size_t len = strlen(k_base_platform) + 1;
187
188 u_base_platform = (elf_addr_t __user *)STACK_ALLOC(p, len);
189 if (__copy_to_user(u_base_platform, k_base_platform, len))
190 return -EFAULT;
191 }
192
193 /*
194 * Generate 16 random bytes for userspace PRNG seeding.
195 */
196 get_random_bytes(k_rand_bytes, sizeof(k_rand_bytes));
197 u_rand_bytes = (elf_addr_t __user *)
198 STACK_ALLOC(p, sizeof(k_rand_bytes));
199 if (__copy_to_user(u_rand_bytes, k_rand_bytes, sizeof(k_rand_bytes)))
200 return -EFAULT;
201
202 /* Create the ELF interpreter info */
203 elf_info = (elf_addr_t *)current->mm->saved_auxv;
204 /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */
205 #define NEW_AUX_ENT(id, val) \
206 do { \
207 elf_info[ei_index++] = id; \
208 elf_info[ei_index++] = val; \
209 } while (0)
210
211 #ifdef ARCH_DLINFO
212 /*
213 * ARCH_DLINFO must come first so PPC can do its special alignment of
214 * AUXV.
215 * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in
216 * ARCH_DLINFO changes
217 */
218 ARCH_DLINFO;
219 #endif
220 NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
221 NEW_AUX_ENT(AT_PAGESZ, ELF_EXEC_PAGESIZE);
222 NEW_AUX_ENT(AT_CLKTCK, CLOCKS_PER_SEC);
223 NEW_AUX_ENT(AT_PHDR, load_addr + exec->e_phoff);
224 NEW_AUX_ENT(AT_PHENT, sizeof(struct elf_phdr));
225 NEW_AUX_ENT(AT_PHNUM, exec->e_phnum);
226 NEW_AUX_ENT(AT_BASE, interp_load_addr);
227 NEW_AUX_ENT(AT_FLAGS, 0);
228 NEW_AUX_ENT(AT_ENTRY, exec->e_entry);
229 NEW_AUX_ENT(AT_UID, from_kuid_munged(cred->user_ns, cred->uid));
230 NEW_AUX_ENT(AT_EUID, from_kuid_munged(cred->user_ns, cred->euid));
231 NEW_AUX_ENT(AT_GID, from_kgid_munged(cred->user_ns, cred->gid));
232 NEW_AUX_ENT(AT_EGID, from_kgid_munged(cred->user_ns, cred->egid));
233 NEW_AUX_ENT(AT_SECURE, security_bprm_secureexec(bprm));
234 NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes);
235 NEW_AUX_ENT(AT_EXECFN, bprm->exec);
236 if (k_platform) {
237 NEW_AUX_ENT(AT_PLATFORM,
238 (elf_addr_t)(unsigned long)u_platform);
239 }
240 if (k_base_platform) {
241 NEW_AUX_ENT(AT_BASE_PLATFORM,
242 (elf_addr_t)(unsigned long)u_base_platform);
243 }
244 if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
245 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
246 }
247 #undef NEW_AUX_ENT
248 /* AT_NULL is zero; clear the rest too */
249 memset(&elf_info[ei_index], 0,
250 sizeof current->mm->saved_auxv - ei_index * sizeof elf_info[0]);
251
252 /* And advance past the AT_NULL entry. */
253 ei_index += 2;
254
255 sp = STACK_ADD(p, ei_index);
256
257 items = (argc + 1) + (envc + 1) + 1;
258 bprm->p = STACK_ROUND(sp, items);
259
260 /* Point sp at the lowest address on the stack */
261 #ifdef CONFIG_STACK_GROWSUP
262 sp = (elf_addr_t __user *)bprm->p - items - ei_index;
263 bprm->exec = (unsigned long)sp; /* XXX: PARISC HACK */
264 #else
265 sp = (elf_addr_t __user *)bprm->p;
266 #endif
267
268
269 /*
270 * Grow the stack manually; some architectures have a limit on how
271 * far ahead a user-space access may be in order to grow the stack.
272 */
273 vma = find_extend_vma(current->mm, bprm->p);
274 if (!vma)
275 return -EFAULT;
276
277 /* Now, let's put argc (and argv, envp if appropriate) on the stack */
278 if (__put_user(argc, sp++))
279 return -EFAULT;
280 argv = sp;
281 envp = argv + argc + 1;
282
283 /* Populate argv and envp */
284 p = current->mm->arg_end = current->mm->arg_start;
285 while (argc-- > 0) {
286 size_t len;
287 if (__put_user((elf_addr_t)p, argv++))
288 return -EFAULT;
289 len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
290 if (!len || len > MAX_ARG_STRLEN)
291 return -EINVAL;
292 p += len;
293 }
294 if (__put_user(0, argv))
295 return -EFAULT;
296 current->mm->arg_end = current->mm->env_start = p;
297 while (envc-- > 0) {
298 size_t len;
299 if (__put_user((elf_addr_t)p, envp++))
300 return -EFAULT;
301 len = strnlen_user((void __user *)p, MAX_ARG_STRLEN);
302 if (!len || len > MAX_ARG_STRLEN)
303 return -EINVAL;
304 p += len;
305 }
306 if (__put_user(0, envp))
307 return -EFAULT;
308 current->mm->env_end = p;
309
310 /* Put the elf_info on the stack in the right place. */
311 sp = (elf_addr_t __user *)envp + 1;
312 if (copy_to_user(sp, elf_info, ei_index * sizeof(elf_addr_t)))
313 return -EFAULT;
314 return 0;
315 }
316
317 static unsigned long elf_map(struct file *filep, unsigned long addr,
318 struct elf_phdr *eppnt, int prot, int type,
319 unsigned long total_size)
320 {
321 unsigned long map_addr;
322 unsigned long size = eppnt->p_filesz + ELF_PAGEOFFSET(eppnt->p_vaddr);
323 unsigned long off = eppnt->p_offset - ELF_PAGEOFFSET(eppnt->p_vaddr);
324 addr = ELF_PAGESTART(addr);
325 size = ELF_PAGEALIGN(size);
326
327 /* mmap() will return -EINVAL if given a zero size, but a
328 * segment with zero filesize is perfectly valid */
329 if (!size)
330 return addr;
331
332 /*
333 * total_size is the size of the ELF (interpreter) image.
334 * The _first_ mmap needs to know the full size, otherwise
335 * randomization might put this image into an overlapping
336 * position with the ELF binary image. (since size < total_size)
337 * So we first map the 'big' image - and unmap the remainder at
338 * the end. (which unmap is needed for ELF images with holes.)
339 */
340 if (total_size) {
341 total_size = ELF_PAGEALIGN(total_size);
342 map_addr = vm_mmap(filep, addr, total_size, prot, type, off);
343 if (!BAD_ADDR(map_addr))
344 vm_munmap(map_addr+size, total_size-size);
345 } else
346 map_addr = vm_mmap(filep, addr, size, prot, type, off);
347
348 return(map_addr);
349 }
350
351 static unsigned long total_mapping_size(struct elf_phdr *cmds, int nr)
352 {
353 int i, first_idx = -1, last_idx = -1;
354
355 for (i = 0; i < nr; i++) {
356 if (cmds[i].p_type == PT_LOAD) {
357 last_idx = i;
358 if (first_idx == -1)
359 first_idx = i;
360 }
361 }
362 if (first_idx == -1)
363 return 0;
364
365 return cmds[last_idx].p_vaddr + cmds[last_idx].p_memsz -
366 ELF_PAGESTART(cmds[first_idx].p_vaddr);
367 }
368
369
370 /* This is much more generalized than the library routine read function,
371 so we keep this separate. Technically the library read function
372 is only provided so that we can read a.out libraries that have
373 an ELF header */
374
375 static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
376 struct file *interpreter, unsigned long *interp_map_addr,
377 unsigned long no_base)
378 {
379 struct elf_phdr *elf_phdata;
380 struct elf_phdr *eppnt;
381 unsigned long load_addr = 0;
382 int load_addr_set = 0;
383 unsigned long last_bss = 0, elf_bss = 0;
384 unsigned long error = ~0UL;
385 unsigned long total_size;
386 int retval, i, size;
387
388 /* First of all, some simple consistency checks */
389 if (interp_elf_ex->e_type != ET_EXEC &&
390 interp_elf_ex->e_type != ET_DYN)
391 goto out;
392 if (!elf_check_arch(interp_elf_ex))
393 goto out;
394 if (!interpreter->f_op || !interpreter->f_op->mmap)
395 goto out;
396
397 /*
398 * If the size of this structure has changed, then punt, since
399 * we will be doing the wrong thing.
400 */
401 if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr))
402 goto out;
403 if (interp_elf_ex->e_phnum < 1 ||
404 interp_elf_ex->e_phnum > 65536U / sizeof(struct elf_phdr))
405 goto out;
406
407 /* Now read in all of the header information */
408 size = sizeof(struct elf_phdr) * interp_elf_ex->e_phnum;
409 if (size > ELF_MIN_ALIGN)
410 goto out;
411 elf_phdata = kmalloc(size, GFP_KERNEL);
412 if (!elf_phdata)
413 goto out;
414
415 retval = kernel_read(interpreter, interp_elf_ex->e_phoff,
416 (char *)elf_phdata, size);
417 error = -EIO;
418 if (retval != size) {
419 if (retval < 0)
420 error = retval;
421 goto out_close;
422 }
423
424 total_size = total_mapping_size(elf_phdata, interp_elf_ex->e_phnum);
425 if (!total_size) {
426 error = -EINVAL;
427 goto out_close;
428 }
429
430 eppnt = elf_phdata;
431 for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) {
432 if (eppnt->p_type == PT_LOAD) {
433 int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
434 int elf_prot = 0;
435 unsigned long vaddr = 0;
436 unsigned long k, map_addr;
437
438 if (eppnt->p_flags & PF_R)
439 elf_prot = PROT_READ;
440 if (eppnt->p_flags & PF_W)
441 elf_prot |= PROT_WRITE;
442 if (eppnt->p_flags & PF_X)
443 elf_prot |= PROT_EXEC;
444 vaddr = eppnt->p_vaddr;
445 if (interp_elf_ex->e_type == ET_EXEC || load_addr_set)
446 elf_type |= MAP_FIXED;
447 else if (no_base && interp_elf_ex->e_type == ET_DYN)
448 load_addr = -vaddr;
449
450 map_addr = elf_map(interpreter, load_addr + vaddr,
451 eppnt, elf_prot, elf_type, total_size);
452 total_size = 0;
453 if (!*interp_map_addr)
454 *interp_map_addr = map_addr;
455 error = map_addr;
456 if (BAD_ADDR(map_addr))
457 goto out_close;
458
459 if (!load_addr_set &&
460 interp_elf_ex->e_type == ET_DYN) {
461 load_addr = map_addr - ELF_PAGESTART(vaddr);
462 load_addr_set = 1;
463 }
464
465 /*
466 * Check to see if the section's size will overflow the
467 * allowed task size. Note that p_filesz must always be
468 * <= p_memsize so it's only necessary to check p_memsz.
469 */
470 k = load_addr + eppnt->p_vaddr;
471 if (BAD_ADDR(k) ||
472 eppnt->p_filesz > eppnt->p_memsz ||
473 eppnt->p_memsz > TASK_SIZE ||
474 TASK_SIZE - eppnt->p_memsz < k) {
475 error = -ENOMEM;
476 goto out_close;
477 }
478
479 /*
480 * Find the end of the file mapping for this phdr, and
481 * keep track of the largest address we see for this.
482 */
483 k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
484 if (k > elf_bss)
485 elf_bss = k;
486
487 /*
488 * Do the same thing for the memory mapping - between
489 * elf_bss and last_bss is the bss section.
490 */
491 k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
492 if (k > last_bss)
493 last_bss = k;
494 }
495 }
496
497 if (last_bss > elf_bss) {
498 /*
499 * Now fill out the bss section. First pad the last page up
500 * to the page boundary, and then perform a mmap to make sure
501 * that there are zero-mapped pages up to and including the
502 * last bss page.
503 */
504 if (padzero(elf_bss)) {
505 error = -EFAULT;
506 goto out_close;
507 }
508
509 /* What we have mapped so far */
510 elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1);
511
512 /* Map the last of the bss segment */
513 error = vm_brk(elf_bss, last_bss - elf_bss);
514 if (BAD_ADDR(error))
515 goto out_close;
516 }
517
518 error = load_addr;
519
520 out_close:
521 kfree(elf_phdata);
522 out:
523 return error;
524 }
525
526 /*
527 * These are the functions used to load ELF style executables and shared
528 * libraries. There is no binary dependent code anywhere else.
529 */
530
531 #define INTERPRETER_NONE 0
532 #define INTERPRETER_ELF 2
533
534 #ifndef STACK_RND_MASK
535 #define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12)) /* 8MB of VA */
536 #endif
537
538 static unsigned long randomize_stack_top(unsigned long stack_top)
539 {
540 unsigned int random_variable = 0;
541
542 if ((current->flags & PF_RANDOMIZE) &&
543 !(current->personality & ADDR_NO_RANDOMIZE)) {
544 random_variable = get_random_int() & STACK_RND_MASK;
545 random_variable <<= PAGE_SHIFT;
546 }
547 #ifdef CONFIG_STACK_GROWSUP
548 return PAGE_ALIGN(stack_top) + random_variable;
549 #else
550 return PAGE_ALIGN(stack_top) - random_variable;
551 #endif
552 }
553
554 static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs)
555 {
556 struct file *interpreter = NULL; /* to shut gcc up */
557 unsigned long load_addr = 0, load_bias = 0;
558 int load_addr_set = 0;
559 char * elf_interpreter = NULL;
560 unsigned long error;
561 struct elf_phdr *elf_ppnt, *elf_phdata;
562 unsigned long elf_bss, elf_brk;
563 int retval, i;
564 unsigned int size;
565 unsigned long elf_entry;
566 unsigned long interp_load_addr = 0;
567 unsigned long start_code, end_code, start_data, end_data;
568 unsigned long reloc_func_desc __maybe_unused = 0;
569 int executable_stack = EXSTACK_DEFAULT;
570 unsigned long def_flags = 0;
571 struct {
572 struct elfhdr elf_ex;
573 struct elfhdr interp_elf_ex;
574 } *loc;
575
576 loc = kmalloc(sizeof(*loc), GFP_KERNEL);
577 if (!loc) {
578 retval = -ENOMEM;
579 goto out_ret;
580 }
581
582 /* Get the exec-header */
583 loc->elf_ex = *((struct elfhdr *)bprm->buf);
584
585 retval = -ENOEXEC;
586 /* First of all, some simple consistency checks */
587 if (memcmp(loc->elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
588 goto out;
589
590 if (loc->elf_ex.e_type != ET_EXEC && loc->elf_ex.e_type != ET_DYN)
591 goto out;
592 if (!elf_check_arch(&loc->elf_ex))
593 goto out;
594 if (!bprm->file->f_op || !bprm->file->f_op->mmap)
595 goto out;
596
597 /* Now read in all of the header information */
598 if (loc->elf_ex.e_phentsize != sizeof(struct elf_phdr))
599 goto out;
600 if (loc->elf_ex.e_phnum < 1 ||
601 loc->elf_ex.e_phnum > 65536U / sizeof(struct elf_phdr))
602 goto out;
603 size = loc->elf_ex.e_phnum * sizeof(struct elf_phdr);
604 retval = -ENOMEM;
605 elf_phdata = kmalloc(size, GFP_KERNEL);
606 if (!elf_phdata)
607 goto out;
608
609 retval = kernel_read(bprm->file, loc->elf_ex.e_phoff,
610 (char *)elf_phdata, size);
611 if (retval != size) {
612 if (retval >= 0)
613 retval = -EIO;
614 goto out_free_ph;
615 }
616
617 elf_ppnt = elf_phdata;
618 elf_bss = 0;
619 elf_brk = 0;
620
621 start_code = ~0UL;
622 end_code = 0;
623 start_data = 0;
624 end_data = 0;
625
626 for (i = 0; i < loc->elf_ex.e_phnum; i++) {
627 if (elf_ppnt->p_type == PT_INTERP) {
628 /* This is the program interpreter used for
629 * shared libraries - for now assume that this
630 * is an a.out format binary
631 */
632 retval = -ENOEXEC;
633 if (elf_ppnt->p_filesz > PATH_MAX ||
634 elf_ppnt->p_filesz < 2)
635 goto out_free_ph;
636
637 retval = -ENOMEM;
638 elf_interpreter = kmalloc(elf_ppnt->p_filesz,
639 GFP_KERNEL);
640 if (!elf_interpreter)
641 goto out_free_ph;
642
643 retval = kernel_read(bprm->file, elf_ppnt->p_offset,
644 elf_interpreter,
645 elf_ppnt->p_filesz);
646 if (retval != elf_ppnt->p_filesz) {
647 if (retval >= 0)
648 retval = -EIO;
649 goto out_free_interp;
650 }
651 /* make sure path is NULL terminated */
652 retval = -ENOEXEC;
653 if (elf_interpreter[elf_ppnt->p_filesz - 1] != '\0')
654 goto out_free_interp;
655
656 interpreter = open_exec(elf_interpreter);
657 retval = PTR_ERR(interpreter);
658 if (IS_ERR(interpreter))
659 goto out_free_interp;
660
661 /*
662 * If the binary is not readable then enforce
663 * mm->dumpable = 0 regardless of the interpreter's
664 * permissions.
665 */
666 would_dump(bprm, interpreter);
667
668 retval = kernel_read(interpreter, 0, bprm->buf,
669 BINPRM_BUF_SIZE);
670 if (retval != BINPRM_BUF_SIZE) {
671 if (retval >= 0)
672 retval = -EIO;
673 goto out_free_dentry;
674 }
675
676 /* Get the exec headers */
677 loc->interp_elf_ex = *((struct elfhdr *)bprm->buf);
678 break;
679 }
680 elf_ppnt++;
681 }
682
683 elf_ppnt = elf_phdata;
684 for (i = 0; i < loc->elf_ex.e_phnum; i++, elf_ppnt++)
685 if (elf_ppnt->p_type == PT_GNU_STACK) {
686 if (elf_ppnt->p_flags & PF_X)
687 executable_stack = EXSTACK_ENABLE_X;
688 else
689 executable_stack = EXSTACK_DISABLE_X;
690 break;
691 }
692
693 /* Some simple consistency checks for the interpreter */
694 if (elf_interpreter) {
695 retval = -ELIBBAD;
696 /* Not an ELF interpreter */
697 if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
698 goto out_free_dentry;
699 /* Verify the interpreter has a valid arch */
700 if (!elf_check_arch(&loc->interp_elf_ex))
701 goto out_free_dentry;
702 }
703
704 /* Flush all traces of the currently running executable */
705 retval = flush_old_exec(bprm);
706 if (retval)
707 goto out_free_dentry;
708
709 /* OK, This is the point of no return */
710 current->mm->def_flags = def_flags;
711
712 /* Do this immediately, since STACK_TOP as used in setup_arg_pages
713 may depend on the personality. */
714 SET_PERSONALITY(loc->elf_ex);
715 if (elf_read_implies_exec(loc->elf_ex, executable_stack))
716 current->personality |= READ_IMPLIES_EXEC;
717
718 if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
719 current->flags |= PF_RANDOMIZE;
720
721 setup_new_exec(bprm);
722
723 /* Do this so that we can load the interpreter, if need be. We will
724 change some of these later */
725 current->mm->free_area_cache = current->mm->mmap_base;
726 current->mm->cached_hole_size = 0;
727 retval = setup_arg_pages(bprm, randomize_stack_top(STACK_TOP),
728 executable_stack);
729 if (retval < 0) {
730 send_sig(SIGKILL, current, 0);
731 goto out_free_dentry;
732 }
733
734 current->mm->start_stack = bprm->p;
735
736 /* Now we do a little grungy work by mmapping the ELF image into
737 the correct location in memory. */
738 for(i = 0, elf_ppnt = elf_phdata;
739 i < loc->elf_ex.e_phnum; i++, elf_ppnt++) {
740 int elf_prot = 0, elf_flags;
741 unsigned long k, vaddr;
742
743 if (elf_ppnt->p_type != PT_LOAD)
744 continue;
745
746 if (unlikely (elf_brk > elf_bss)) {
747 unsigned long nbyte;
748
749 /* There was a PT_LOAD segment with p_memsz > p_filesz
750 before this one. Map anonymous pages, if needed,
751 and clear the area. */
752 retval = set_brk(elf_bss + load_bias,
753 elf_brk + load_bias);
754 if (retval) {
755 send_sig(SIGKILL, current, 0);
756 goto out_free_dentry;
757 }
758 nbyte = ELF_PAGEOFFSET(elf_bss);
759 if (nbyte) {
760 nbyte = ELF_MIN_ALIGN - nbyte;
761 if (nbyte > elf_brk - elf_bss)
762 nbyte = elf_brk - elf_bss;
763 if (clear_user((void __user *)elf_bss +
764 load_bias, nbyte)) {
765 /*
766 * This bss-zeroing can fail if the ELF
767 * file specifies odd protections. So
768 * we don't check the return value
769 */
770 }
771 }
772 }
773
774 if (elf_ppnt->p_flags & PF_R)
775 elf_prot |= PROT_READ;
776 if (elf_ppnt->p_flags & PF_W)
777 elf_prot |= PROT_WRITE;
778 if (elf_ppnt->p_flags & PF_X)
779 elf_prot |= PROT_EXEC;
780
781 elf_flags = MAP_PRIVATE | MAP_DENYWRITE | MAP_EXECUTABLE;
782
783 vaddr = elf_ppnt->p_vaddr;
784 if (loc->elf_ex.e_type == ET_EXEC || load_addr_set) {
785 elf_flags |= MAP_FIXED;
786 } else if (loc->elf_ex.e_type == ET_DYN) {
787 /* Try and get dynamic programs out of the way of the
788 * default mmap base, as well as whatever program they
789 * might try to exec. This is because the brk will
790 * follow the loader, and is not movable. */
791 #ifdef CONFIG_ARCH_BINFMT_ELF_RANDOMIZE_PIE
792 /* Memory randomization might have been switched off
793 * in runtime via sysctl.
794 * If that is the case, retain the original non-zero
795 * load_bias value in order to establish proper
796 * non-randomized mappings.
797 */
798 if (current->flags & PF_RANDOMIZE)
799 load_bias = 0;
800 else
801 load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
802 #else
803 load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
804 #endif
805 }
806
807 error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
808 elf_prot, elf_flags, 0);
809 if (BAD_ADDR(error)) {
810 send_sig(SIGKILL, current, 0);
811 retval = IS_ERR((void *)error) ?
812 PTR_ERR((void*)error) : -EINVAL;
813 goto out_free_dentry;
814 }
815
816 if (!load_addr_set) {
817 load_addr_set = 1;
818 load_addr = (elf_ppnt->p_vaddr - elf_ppnt->p_offset);
819 if (loc->elf_ex.e_type == ET_DYN) {
820 load_bias += error -
821 ELF_PAGESTART(load_bias + vaddr);
822 load_addr += load_bias;
823 reloc_func_desc = load_bias;
824 }
825 }
826 k = elf_ppnt->p_vaddr;
827 if (k < start_code)
828 start_code = k;
829 if (start_data < k)
830 start_data = k;
831
832 /*
833 * Check to see if the section's size will overflow the
834 * allowed task size. Note that p_filesz must always be
835 * <= p_memsz so it is only necessary to check p_memsz.
836 */
837 if (BAD_ADDR(k) || elf_ppnt->p_filesz > elf_ppnt->p_memsz ||
838 elf_ppnt->p_memsz > TASK_SIZE ||
839 TASK_SIZE - elf_ppnt->p_memsz < k) {
840 /* set_brk can never work. Avoid overflows. */
841 send_sig(SIGKILL, current, 0);
842 retval = -EINVAL;
843 goto out_free_dentry;
844 }
845
846 k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
847
848 if (k > elf_bss)
849 elf_bss = k;
850 if ((elf_ppnt->p_flags & PF_X) && end_code < k)
851 end_code = k;
852 if (end_data < k)
853 end_data = k;
854 k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
855 if (k > elf_brk)
856 elf_brk = k;
857 }
858
859 loc->elf_ex.e_entry += load_bias;
860 elf_bss += load_bias;
861 elf_brk += load_bias;
862 start_code += load_bias;
863 end_code += load_bias;
864 start_data += load_bias;
865 end_data += load_bias;
866
867 /* Calling set_brk effectively mmaps the pages that we need
868 * for the bss and break sections. We must do this before
869 * mapping in the interpreter, to make sure it doesn't wind
870 * up getting placed where the bss needs to go.
871 */
872 retval = set_brk(elf_bss, elf_brk);
873 if (retval) {
874 send_sig(SIGKILL, current, 0);
875 goto out_free_dentry;
876 }
877 if (likely(elf_bss != elf_brk) && unlikely(padzero(elf_bss))) {
878 send_sig(SIGSEGV, current, 0);
879 retval = -EFAULT; /* Nobody gets to see this, but.. */
880 goto out_free_dentry;
881 }
882
883 if (elf_interpreter) {
884 unsigned long uninitialized_var(interp_map_addr);
885
886 elf_entry = load_elf_interp(&loc->interp_elf_ex,
887 interpreter,
888 &interp_map_addr,
889 load_bias);
890 if (!IS_ERR((void *)elf_entry)) {
891 /*
892 * load_elf_interp() returns relocation
893 * adjustment
894 */
895 interp_load_addr = elf_entry;
896 elf_entry += loc->interp_elf_ex.e_entry;
897 }
898 if (BAD_ADDR(elf_entry)) {
899 force_sig(SIGSEGV, current);
900 retval = IS_ERR((void *)elf_entry) ?
901 (int)elf_entry : -EINVAL;
902 goto out_free_dentry;
903 }
904 reloc_func_desc = interp_load_addr;
905
906 allow_write_access(interpreter);
907 fput(interpreter);
908 kfree(elf_interpreter);
909 } else {
910 elf_entry = loc->elf_ex.e_entry;
911 if (BAD_ADDR(elf_entry)) {
912 force_sig(SIGSEGV, current);
913 retval = -EINVAL;
914 goto out_free_dentry;
915 }
916 }
917
918 kfree(elf_phdata);
919
920 set_binfmt(&elf_format);
921
922 #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES
923 retval = arch_setup_additional_pages(bprm, !!elf_interpreter);
924 if (retval < 0) {
925 send_sig(SIGKILL, current, 0);
926 goto out;
927 }
928 #endif /* ARCH_HAS_SETUP_ADDITIONAL_PAGES */
929
930 install_exec_creds(bprm);
931 retval = create_elf_tables(bprm, &loc->elf_ex,
932 load_addr, interp_load_addr);
933 if (retval < 0) {
934 send_sig(SIGKILL, current, 0);
935 goto out;
936 }
937 /* N.B. passed_fileno might not be initialized? */
938 current->mm->end_code = end_code;
939 current->mm->start_code = start_code;
940 current->mm->start_data = start_data;
941 current->mm->end_data = end_data;
942 current->mm->start_stack = bprm->p;
943
944 #ifdef arch_randomize_brk
945 if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) {
946 current->mm->brk = current->mm->start_brk =
947 arch_randomize_brk(current->mm);
948 #ifdef CONFIG_COMPAT_BRK
949 current->brk_randomized = 1;
950 #endif
951 }
952 #endif
953
954 if (current->personality & MMAP_PAGE_ZERO) {
955 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
956 and some applications "depend" upon this behavior.
957 Since we do not have the power to recompile these, we
958 emulate the SVr4 behavior. Sigh. */
959 error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
960 MAP_FIXED | MAP_PRIVATE, 0);
961 }
962
963 #ifdef ELF_PLAT_INIT
964 /*
965 * The ABI may specify that certain registers be set up in special
966 * ways (on i386 %edx is the address of a DT_FINI function, for
967 * example. In addition, it may also specify (eg, PowerPC64 ELF)
968 * that the e_entry field is the address of the function descriptor
969 * for the startup routine, rather than the address of the startup
970 * routine itself. This macro performs whatever initialization to
971 * the regs structure is required as well as any relocations to the
972 * function descriptor entries when executing dynamically links apps.
973 */
974 ELF_PLAT_INIT(regs, reloc_func_desc);
975 #endif
976
977 start_thread(regs, elf_entry, bprm->p);
978 retval = 0;
979 out:
980 kfree(loc);
981 out_ret:
982 return retval;
983
984 /* error cleanup */
985 out_free_dentry:
986 allow_write_access(interpreter);
987 if (interpreter)
988 fput(interpreter);
989 out_free_interp:
990 kfree(elf_interpreter);
991 out_free_ph:
992 kfree(elf_phdata);
993 goto out;
994 }
995
996 /* This is really simpleminded and specialized - we are loading an
997 a.out library that is given an ELF header. */
998 static int load_elf_library(struct file *file)
999 {
1000 struct elf_phdr *elf_phdata;
1001 struct elf_phdr *eppnt;
1002 unsigned long elf_bss, bss, len;
1003 int retval, error, i, j;
1004 struct elfhdr elf_ex;
1005
1006 error = -ENOEXEC;
1007 retval = kernel_read(file, 0, (char *)&elf_ex, sizeof(elf_ex));
1008 if (retval != sizeof(elf_ex))
1009 goto out;
1010
1011 if (memcmp(elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
1012 goto out;
1013
1014 /* First of all, some simple consistency checks */
1015 if (elf_ex.e_type != ET_EXEC || elf_ex.e_phnum > 2 ||
1016 !elf_check_arch(&elf_ex) || !file->f_op || !file->f_op->mmap)
1017 goto out;
1018
1019 /* Now read in all of the header information */
1020
1021 j = sizeof(struct elf_phdr) * elf_ex.e_phnum;
1022 /* j < ELF_MIN_ALIGN because elf_ex.e_phnum <= 2 */
1023
1024 error = -ENOMEM;
1025 elf_phdata = kmalloc(j, GFP_KERNEL);
1026 if (!elf_phdata)
1027 goto out;
1028
1029 eppnt = elf_phdata;
1030 error = -ENOEXEC;
1031 retval = kernel_read(file, elf_ex.e_phoff, (char *)eppnt, j);
1032 if (retval != j)
1033 goto out_free_ph;
1034
1035 for (j = 0, i = 0; i<elf_ex.e_phnum; i++)
1036 if ((eppnt + i)->p_type == PT_LOAD)
1037 j++;
1038 if (j != 1)
1039 goto out_free_ph;
1040
1041 while (eppnt->p_type != PT_LOAD)
1042 eppnt++;
1043
1044 /* Now use mmap to map the library into memory. */
1045 error = vm_mmap(file,
1046 ELF_PAGESTART(eppnt->p_vaddr),
1047 (eppnt->p_filesz +
1048 ELF_PAGEOFFSET(eppnt->p_vaddr)),
1049 PROT_READ | PROT_WRITE | PROT_EXEC,
1050 MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE,
1051 (eppnt->p_offset -
1052 ELF_PAGEOFFSET(eppnt->p_vaddr)));
1053 if (error != ELF_PAGESTART(eppnt->p_vaddr))
1054 goto out_free_ph;
1055
1056 elf_bss = eppnt->p_vaddr + eppnt->p_filesz;
1057 if (padzero(elf_bss)) {
1058 error = -EFAULT;
1059 goto out_free_ph;
1060 }
1061
1062 len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr +
1063 ELF_MIN_ALIGN - 1);
1064 bss = eppnt->p_memsz + eppnt->p_vaddr;
1065 if (bss > len)
1066 vm_brk(len, bss - len);
1067 error = 0;
1068
1069 out_free_ph:
1070 kfree(elf_phdata);
1071 out:
1072 return error;
1073 }
1074
1075 #ifdef CONFIG_ELF_CORE
1076 /*
1077 * ELF core dumper
1078 *
1079 * Modelled on fs/exec.c:aout_core_dump()
1080 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1081 */
1082
1083 /*
1084 * The purpose of always_dump_vma() is to make sure that special kernel mappings
1085 * that are useful for post-mortem analysis are included in every core dump.
1086 * In that way we ensure that the core dump is fully interpretable later
1087 * without matching up the same kernel and hardware config to see what PC values
1088 * meant. These special mappings include - vDSO, vsyscall, and other
1089 * architecture specific mappings
1090 */
1091 static bool always_dump_vma(struct vm_area_struct *vma)
1092 {
1093 /* Any vsyscall mappings? */
1094 if (vma == get_gate_vma(vma->vm_mm))
1095 return true;
1096 /*
1097 * arch_vma_name() returns non-NULL for special architecture mappings,
1098 * such as vDSO sections.
1099 */
1100 if (arch_vma_name(vma))
1101 return true;
1102
1103 return false;
1104 }
1105
1106 /*
1107 * Decide what to dump of a segment, part, all or none.
1108 */
1109 static unsigned long vma_dump_size(struct vm_area_struct *vma,
1110 unsigned long mm_flags)
1111 {
1112 #define FILTER(type) (mm_flags & (1UL << MMF_DUMP_##type))
1113
1114 /* always dump the vdso and vsyscall sections */
1115 if (always_dump_vma(vma))
1116 goto whole;
1117
1118 if (vma->vm_flags & VM_NODUMP)
1119 return 0;
1120
1121 /* Hugetlb memory check */
1122 if (vma->vm_flags & VM_HUGETLB) {
1123 if ((vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_SHARED))
1124 goto whole;
1125 if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE))
1126 goto whole;
1127 }
1128
1129 /* Do not dump I/O mapped devices or special mappings */
1130 if (vma->vm_flags & (VM_IO | VM_RESERVED))
1131 return 0;
1132
1133 /* By default, dump shared memory if mapped from an anonymous file. */
1134 if (vma->vm_flags & VM_SHARED) {
1135 if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0 ?
1136 FILTER(ANON_SHARED) : FILTER(MAPPED_SHARED))
1137 goto whole;
1138 return 0;
1139 }
1140
1141 /* Dump segments that have been written to. */
1142 if (vma->anon_vma && FILTER(ANON_PRIVATE))
1143 goto whole;
1144 if (vma->vm_file == NULL)
1145 return 0;
1146
1147 if (FILTER(MAPPED_PRIVATE))
1148 goto whole;
1149
1150 /*
1151 * If this looks like the beginning of a DSO or executable mapping,
1152 * check for an ELF header. If we find one, dump the first page to
1153 * aid in determining what was mapped here.
1154 */
1155 if (FILTER(ELF_HEADERS) &&
1156 vma->vm_pgoff == 0 && (vma->vm_flags & VM_READ)) {
1157 u32 __user *header = (u32 __user *) vma->vm_start;
1158 u32 word;
1159 mm_segment_t fs = get_fs();
1160 /*
1161 * Doing it this way gets the constant folded by GCC.
1162 */
1163 union {
1164 u32 cmp;
1165 char elfmag[SELFMAG];
1166 } magic;
1167 BUILD_BUG_ON(SELFMAG != sizeof word);
1168 magic.elfmag[EI_MAG0] = ELFMAG0;
1169 magic.elfmag[EI_MAG1] = ELFMAG1;
1170 magic.elfmag[EI_MAG2] = ELFMAG2;
1171 magic.elfmag[EI_MAG3] = ELFMAG3;
1172 /*
1173 * Switch to the user "segment" for get_user(),
1174 * then put back what elf_core_dump() had in place.
1175 */
1176 set_fs(USER_DS);
1177 if (unlikely(get_user(word, header)))
1178 word = 0;
1179 set_fs(fs);
1180 if (word == magic.cmp)
1181 return PAGE_SIZE;
1182 }
1183
1184 #undef FILTER
1185
1186 return 0;
1187
1188 whole:
1189 return vma->vm_end - vma->vm_start;
1190 }
1191
1192 /* An ELF note in memory */
1193 struct memelfnote
1194 {
1195 const char *name;
1196 int type;
1197 unsigned int datasz;
1198 void *data;
1199 };
1200
1201 static int notesize(struct memelfnote *en)
1202 {
1203 int sz;
1204
1205 sz = sizeof(struct elf_note);
1206 sz += roundup(strlen(en->name) + 1, 4);
1207 sz += roundup(en->datasz, 4);
1208
1209 return sz;
1210 }
1211
1212 #define DUMP_WRITE(addr, nr, foffset) \
1213 do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0)
1214
1215 static int alignfile(struct file *file, loff_t *foffset)
1216 {
1217 static const char buf[4] = { 0, };
1218 DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset);
1219 return 1;
1220 }
1221
1222 static int writenote(struct memelfnote *men, struct file *file,
1223 loff_t *foffset)
1224 {
1225 struct elf_note en;
1226 en.n_namesz = strlen(men->name) + 1;
1227 en.n_descsz = men->datasz;
1228 en.n_type = men->type;
1229
1230 DUMP_WRITE(&en, sizeof(en), foffset);
1231 DUMP_WRITE(men->name, en.n_namesz, foffset);
1232 if (!alignfile(file, foffset))
1233 return 0;
1234 DUMP_WRITE(men->data, men->datasz, foffset);
1235 if (!alignfile(file, foffset))
1236 return 0;
1237
1238 return 1;
1239 }
1240 #undef DUMP_WRITE
1241
1242 static void fill_elf_header(struct elfhdr *elf, int segs,
1243 u16 machine, u32 flags, u8 osabi)
1244 {
1245 memset(elf, 0, sizeof(*elf));
1246
1247 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1248 elf->e_ident[EI_CLASS] = ELF_CLASS;
1249 elf->e_ident[EI_DATA] = ELF_DATA;
1250 elf->e_ident[EI_VERSION] = EV_CURRENT;
1251 elf->e_ident[EI_OSABI] = ELF_OSABI;
1252
1253 elf->e_type = ET_CORE;
1254 elf->e_machine = machine;
1255 elf->e_version = EV_CURRENT;
1256 elf->e_phoff = sizeof(struct elfhdr);
1257 elf->e_flags = flags;
1258 elf->e_ehsize = sizeof(struct elfhdr);
1259 elf->e_phentsize = sizeof(struct elf_phdr);
1260 elf->e_phnum = segs;
1261
1262 return;
1263 }
1264
1265 static void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1266 {
1267 phdr->p_type = PT_NOTE;
1268 phdr->p_offset = offset;
1269 phdr->p_vaddr = 0;
1270 phdr->p_paddr = 0;
1271 phdr->p_filesz = sz;
1272 phdr->p_memsz = 0;
1273 phdr->p_flags = 0;
1274 phdr->p_align = 0;
1275 return;
1276 }
1277
1278 static void fill_note(struct memelfnote *note, const char *name, int type,
1279 unsigned int sz, void *data)
1280 {
1281 note->name = name;
1282 note->type = type;
1283 note->datasz = sz;
1284 note->data = data;
1285 return;
1286 }
1287
1288 /*
1289 * fill up all the fields in prstatus from the given task struct, except
1290 * registers which need to be filled up separately.
1291 */
1292 static void fill_prstatus(struct elf_prstatus *prstatus,
1293 struct task_struct *p, long signr)
1294 {
1295 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1296 prstatus->pr_sigpend = p->pending.signal.sig[0];
1297 prstatus->pr_sighold = p->blocked.sig[0];
1298 rcu_read_lock();
1299 prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1300 rcu_read_unlock();
1301 prstatus->pr_pid = task_pid_vnr(p);
1302 prstatus->pr_pgrp = task_pgrp_vnr(p);
1303 prstatus->pr_sid = task_session_vnr(p);
1304 if (thread_group_leader(p)) {
1305 struct task_cputime cputime;
1306
1307 /*
1308 * This is the record for the group leader. It shows the
1309 * group-wide total, not its individual thread total.
1310 */
1311 thread_group_cputime(p, &cputime);
1312 cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
1313 cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
1314 } else {
1315 cputime_to_timeval(p->utime, &prstatus->pr_utime);
1316 cputime_to_timeval(p->stime, &prstatus->pr_stime);
1317 }
1318 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1319 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1320 }
1321
1322 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1323 struct mm_struct *mm)
1324 {
1325 const struct cred *cred;
1326 unsigned int i, len;
1327
1328 /* first copy the parameters from user space */
1329 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1330
1331 len = mm->arg_end - mm->arg_start;
1332 if (len >= ELF_PRARGSZ)
1333 len = ELF_PRARGSZ-1;
1334 if (copy_from_user(&psinfo->pr_psargs,
1335 (const char __user *)mm->arg_start, len))
1336 return -EFAULT;
1337 for(i = 0; i < len; i++)
1338 if (psinfo->pr_psargs[i] == 0)
1339 psinfo->pr_psargs[i] = ' ';
1340 psinfo->pr_psargs[len] = 0;
1341
1342 rcu_read_lock();
1343 psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1344 rcu_read_unlock();
1345 psinfo->pr_pid = task_pid_vnr(p);
1346 psinfo->pr_pgrp = task_pgrp_vnr(p);
1347 psinfo->pr_sid = task_session_vnr(p);
1348
1349 i = p->state ? ffz(~p->state) + 1 : 0;
1350 psinfo->pr_state = i;
1351 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1352 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1353 psinfo->pr_nice = task_nice(p);
1354 psinfo->pr_flag = p->flags;
1355 rcu_read_lock();
1356 cred = __task_cred(p);
1357 SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
1358 SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
1359 rcu_read_unlock();
1360 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1361
1362 return 0;
1363 }
1364
1365 static void fill_auxv_note(struct memelfnote *note, struct mm_struct *mm)
1366 {
1367 elf_addr_t *auxv = (elf_addr_t *) mm->saved_auxv;
1368 int i = 0;
1369 do
1370 i += 2;
1371 while (auxv[i - 2] != AT_NULL);
1372 fill_note(note, "CORE", NT_AUXV, i * sizeof(elf_addr_t), auxv);
1373 }
1374
1375 #ifdef CORE_DUMP_USE_REGSET
1376 #include <linux/regset.h>
1377
1378 struct elf_thread_core_info {
1379 struct elf_thread_core_info *next;
1380 struct task_struct *task;
1381 struct elf_prstatus prstatus;
1382 struct memelfnote notes[0];
1383 };
1384
1385 struct elf_note_info {
1386 struct elf_thread_core_info *thread;
1387 struct memelfnote psinfo;
1388 struct memelfnote auxv;
1389 size_t size;
1390 int thread_notes;
1391 };
1392
1393 /*
1394 * When a regset has a writeback hook, we call it on each thread before
1395 * dumping user memory. On register window machines, this makes sure the
1396 * user memory backing the register data is up to date before we read it.
1397 */
1398 static void do_thread_regset_writeback(struct task_struct *task,
1399 const struct user_regset *regset)
1400 {
1401 if (regset->writeback)
1402 regset->writeback(task, regset, 1);
1403 }
1404
1405 #ifndef PR_REG_SIZE
1406 #define PR_REG_SIZE(S) sizeof(S)
1407 #endif
1408
1409 #ifndef PRSTATUS_SIZE
1410 #define PRSTATUS_SIZE(S) sizeof(S)
1411 #endif
1412
1413 #ifndef PR_REG_PTR
1414 #define PR_REG_PTR(S) (&((S)->pr_reg))
1415 #endif
1416
1417 #ifndef SET_PR_FPVALID
1418 #define SET_PR_FPVALID(S, V) ((S)->pr_fpvalid = (V))
1419 #endif
1420
1421 static int fill_thread_core_info(struct elf_thread_core_info *t,
1422 const struct user_regset_view *view,
1423 long signr, size_t *total)
1424 {
1425 unsigned int i;
1426
1427 /*
1428 * NT_PRSTATUS is the one special case, because the regset data
1429 * goes into the pr_reg field inside the note contents, rather
1430 * than being the whole note contents. We fill the reset in here.
1431 * We assume that regset 0 is NT_PRSTATUS.
1432 */
1433 fill_prstatus(&t->prstatus, t->task, signr);
1434 (void) view->regsets[0].get(t->task, &view->regsets[0],
1435 0, PR_REG_SIZE(t->prstatus.pr_reg),
1436 PR_REG_PTR(&t->prstatus), NULL);
1437
1438 fill_note(&t->notes[0], "CORE", NT_PRSTATUS,
1439 PRSTATUS_SIZE(t->prstatus), &t->prstatus);
1440 *total += notesize(&t->notes[0]);
1441
1442 do_thread_regset_writeback(t->task, &view->regsets[0]);
1443
1444 /*
1445 * Each other regset might generate a note too. For each regset
1446 * that has no core_note_type or is inactive, we leave t->notes[i]
1447 * all zero and we'll know to skip writing it later.
1448 */
1449 for (i = 1; i < view->n; ++i) {
1450 const struct user_regset *regset = &view->regsets[i];
1451 do_thread_regset_writeback(t->task, regset);
1452 if (regset->core_note_type && regset->get &&
1453 (!regset->active || regset->active(t->task, regset))) {
1454 int ret;
1455 size_t size = regset->n * regset->size;
1456 void *data = kmalloc(size, GFP_KERNEL);
1457 if (unlikely(!data))
1458 return 0;
1459 ret = regset->get(t->task, regset,
1460 0, size, data, NULL);
1461 if (unlikely(ret))
1462 kfree(data);
1463 else {
1464 if (regset->core_note_type != NT_PRFPREG)
1465 fill_note(&t->notes[i], "LINUX",
1466 regset->core_note_type,
1467 size, data);
1468 else {
1469 SET_PR_FPVALID(&t->prstatus, 1);
1470 fill_note(&t->notes[i], "CORE",
1471 NT_PRFPREG, size, data);
1472 }
1473 *total += notesize(&t->notes[i]);
1474 }
1475 }
1476 }
1477
1478 return 1;
1479 }
1480
1481 static int fill_note_info(struct elfhdr *elf, int phdrs,
1482 struct elf_note_info *info,
1483 long signr, struct pt_regs *regs)
1484 {
1485 struct task_struct *dump_task = current;
1486 const struct user_regset_view *view = task_user_regset_view(dump_task);
1487 struct elf_thread_core_info *t;
1488 struct elf_prpsinfo *psinfo;
1489 struct core_thread *ct;
1490 unsigned int i;
1491
1492 info->size = 0;
1493 info->thread = NULL;
1494
1495 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1496 if (psinfo == NULL)
1497 return 0;
1498
1499 fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1500
1501 /*
1502 * Figure out how many notes we're going to need for each thread.
1503 */
1504 info->thread_notes = 0;
1505 for (i = 0; i < view->n; ++i)
1506 if (view->regsets[i].core_note_type != 0)
1507 ++info->thread_notes;
1508
1509 /*
1510 * Sanity check. We rely on regset 0 being in NT_PRSTATUS,
1511 * since it is our one special case.
1512 */
1513 if (unlikely(info->thread_notes == 0) ||
1514 unlikely(view->regsets[0].core_note_type != NT_PRSTATUS)) {
1515 WARN_ON(1);
1516 return 0;
1517 }
1518
1519 /*
1520 * Initialize the ELF file header.
1521 */
1522 fill_elf_header(elf, phdrs,
1523 view->e_machine, view->e_flags, view->ei_osabi);
1524
1525 /*
1526 * Allocate a structure for each thread.
1527 */
1528 for (ct = &dump_task->mm->core_state->dumper; ct; ct = ct->next) {
1529 t = kzalloc(offsetof(struct elf_thread_core_info,
1530 notes[info->thread_notes]),
1531 GFP_KERNEL);
1532 if (unlikely(!t))
1533 return 0;
1534
1535 t->task = ct->task;
1536 if (ct->task == dump_task || !info->thread) {
1537 t->next = info->thread;
1538 info->thread = t;
1539 } else {
1540 /*
1541 * Make sure to keep the original task at
1542 * the head of the list.
1543 */
1544 t->next = info->thread->next;
1545 info->thread->next = t;
1546 }
1547 }
1548
1549 /*
1550 * Now fill in each thread's information.
1551 */
1552 for (t = info->thread; t != NULL; t = t->next)
1553 if (!fill_thread_core_info(t, view, signr, &info->size))
1554 return 0;
1555
1556 /*
1557 * Fill in the two process-wide notes.
1558 */
1559 fill_psinfo(psinfo, dump_task->group_leader, dump_task->mm);
1560 info->size += notesize(&info->psinfo);
1561
1562 fill_auxv_note(&info->auxv, current->mm);
1563 info->size += notesize(&info->auxv);
1564
1565 return 1;
1566 }
1567
1568 static size_t get_note_info_size(struct elf_note_info *info)
1569 {
1570 return info->size;
1571 }
1572
1573 /*
1574 * Write all the notes for each thread. When writing the first thread, the
1575 * process-wide notes are interleaved after the first thread-specific note.
1576 */
1577 static int write_note_info(struct elf_note_info *info,
1578 struct file *file, loff_t *foffset)
1579 {
1580 bool first = 1;
1581 struct elf_thread_core_info *t = info->thread;
1582
1583 do {
1584 int i;
1585
1586 if (!writenote(&t->notes[0], file, foffset))
1587 return 0;
1588
1589 if (first && !writenote(&info->psinfo, file, foffset))
1590 return 0;
1591 if (first && !writenote(&info->auxv, file, foffset))
1592 return 0;
1593
1594 for (i = 1; i < info->thread_notes; ++i)
1595 if (t->notes[i].data &&
1596 !writenote(&t->notes[i], file, foffset))
1597 return 0;
1598
1599 first = 0;
1600 t = t->next;
1601 } while (t);
1602
1603 return 1;
1604 }
1605
1606 static void free_note_info(struct elf_note_info *info)
1607 {
1608 struct elf_thread_core_info *threads = info->thread;
1609 while (threads) {
1610 unsigned int i;
1611 struct elf_thread_core_info *t = threads;
1612 threads = t->next;
1613 WARN_ON(t->notes[0].data && t->notes[0].data != &t->prstatus);
1614 for (i = 1; i < info->thread_notes; ++i)
1615 kfree(t->notes[i].data);
1616 kfree(t);
1617 }
1618 kfree(info->psinfo.data);
1619 }
1620
1621 #else
1622
1623 /* Here is the structure in which status of each thread is captured. */
1624 struct elf_thread_status
1625 {
1626 struct list_head list;
1627 struct elf_prstatus prstatus; /* NT_PRSTATUS */
1628 elf_fpregset_t fpu; /* NT_PRFPREG */
1629 struct task_struct *thread;
1630 #ifdef ELF_CORE_COPY_XFPREGS
1631 elf_fpxregset_t xfpu; /* ELF_CORE_XFPREG_TYPE */
1632 #endif
1633 struct memelfnote notes[3];
1634 int num_notes;
1635 };
1636
1637 /*
1638 * In order to add the specific thread information for the elf file format,
1639 * we need to keep a linked list of every threads pr_status and then create
1640 * a single section for them in the final core file.
1641 */
1642 static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1643 {
1644 int sz = 0;
1645 struct task_struct *p = t->thread;
1646 t->num_notes = 0;
1647
1648 fill_prstatus(&t->prstatus, p, signr);
1649 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1650
1651 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1652 &(t->prstatus));
1653 t->num_notes++;
1654 sz += notesize(&t->notes[0]);
1655
1656 if ((t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL,
1657 &t->fpu))) {
1658 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1659 &(t->fpu));
1660 t->num_notes++;
1661 sz += notesize(&t->notes[1]);
1662 }
1663
1664 #ifdef ELF_CORE_COPY_XFPREGS
1665 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1666 fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
1667 sizeof(t->xfpu), &t->xfpu);
1668 t->num_notes++;
1669 sz += notesize(&t->notes[2]);
1670 }
1671 #endif
1672 return sz;
1673 }
1674
1675 struct elf_note_info {
1676 struct memelfnote *notes;
1677 struct elf_prstatus *prstatus; /* NT_PRSTATUS */
1678 struct elf_prpsinfo *psinfo; /* NT_PRPSINFO */
1679 struct list_head thread_list;
1680 elf_fpregset_t *fpu;
1681 #ifdef ELF_CORE_COPY_XFPREGS
1682 elf_fpxregset_t *xfpu;
1683 #endif
1684 int thread_status_size;
1685 int numnote;
1686 };
1687
1688 static int elf_note_info_init(struct elf_note_info *info)
1689 {
1690 memset(info, 0, sizeof(*info));
1691 INIT_LIST_HEAD(&info->thread_list);
1692
1693 /* Allocate space for six ELF notes */
1694 info->notes = kmalloc(6 * sizeof(struct memelfnote), GFP_KERNEL);
1695 if (!info->notes)
1696 return 0;
1697 info->psinfo = kmalloc(sizeof(*info->psinfo), GFP_KERNEL);
1698 if (!info->psinfo)
1699 goto notes_free;
1700 info->prstatus = kmalloc(sizeof(*info->prstatus), GFP_KERNEL);
1701 if (!info->prstatus)
1702 goto psinfo_free;
1703 info->fpu = kmalloc(sizeof(*info->fpu), GFP_KERNEL);
1704 if (!info->fpu)
1705 goto prstatus_free;
1706 #ifdef ELF_CORE_COPY_XFPREGS
1707 info->xfpu = kmalloc(sizeof(*info->xfpu), GFP_KERNEL);
1708 if (!info->xfpu)
1709 goto fpu_free;
1710 #endif
1711 return 1;
1712 #ifdef ELF_CORE_COPY_XFPREGS
1713 fpu_free:
1714 kfree(info->fpu);
1715 #endif
1716 prstatus_free:
1717 kfree(info->prstatus);
1718 psinfo_free:
1719 kfree(info->psinfo);
1720 notes_free:
1721 kfree(info->notes);
1722 return 0;
1723 }
1724
1725 static int fill_note_info(struct elfhdr *elf, int phdrs,
1726 struct elf_note_info *info,
1727 long signr, struct pt_regs *regs)
1728 {
1729 struct list_head *t;
1730
1731 if (!elf_note_info_init(info))
1732 return 0;
1733
1734 if (signr) {
1735 struct core_thread *ct;
1736 struct elf_thread_status *ets;
1737
1738 for (ct = current->mm->core_state->dumper.next;
1739 ct; ct = ct->next) {
1740 ets = kzalloc(sizeof(*ets), GFP_KERNEL);
1741 if (!ets)
1742 return 0;
1743
1744 ets->thread = ct->task;
1745 list_add(&ets->list, &info->thread_list);
1746 }
1747
1748 list_for_each(t, &info->thread_list) {
1749 int sz;
1750
1751 ets = list_entry(t, struct elf_thread_status, list);
1752 sz = elf_dump_thread_status(signr, ets);
1753 info->thread_status_size += sz;
1754 }
1755 }
1756 /* now collect the dump for the current */
1757 memset(info->prstatus, 0, sizeof(*info->prstatus));
1758 fill_prstatus(info->prstatus, current, signr);
1759 elf_core_copy_regs(&info->prstatus->pr_reg, regs);
1760
1761 /* Set up header */
1762 fill_elf_header(elf, phdrs, ELF_ARCH, ELF_CORE_EFLAGS, ELF_OSABI);
1763
1764 /*
1765 * Set up the notes in similar form to SVR4 core dumps made
1766 * with info from their /proc.
1767 */
1768
1769 fill_note(info->notes + 0, "CORE", NT_PRSTATUS,
1770 sizeof(*info->prstatus), info->prstatus);
1771 fill_psinfo(info->psinfo, current->group_leader, current->mm);
1772 fill_note(info->notes + 1, "CORE", NT_PRPSINFO,
1773 sizeof(*info->psinfo), info->psinfo);
1774
1775 info->numnote = 2;
1776
1777 fill_auxv_note(&info->notes[info->numnote++], current->mm);
1778
1779 /* Try to dump the FPU. */
1780 info->prstatus->pr_fpvalid = elf_core_copy_task_fpregs(current, regs,
1781 info->fpu);
1782 if (info->prstatus->pr_fpvalid)
1783 fill_note(info->notes + info->numnote++,
1784 "CORE", NT_PRFPREG, sizeof(*info->fpu), info->fpu);
1785 #ifdef ELF_CORE_COPY_XFPREGS
1786 if (elf_core_copy_task_xfpregs(current, info->xfpu))
1787 fill_note(info->notes + info->numnote++,
1788 "LINUX", ELF_CORE_XFPREG_TYPE,
1789 sizeof(*info->xfpu), info->xfpu);
1790 #endif
1791
1792 return 1;
1793 }
1794
1795 static size_t get_note_info_size(struct elf_note_info *info)
1796 {
1797 int sz = 0;
1798 int i;
1799
1800 for (i = 0; i < info->numnote; i++)
1801 sz += notesize(info->notes + i);
1802
1803 sz += info->thread_status_size;
1804
1805 return sz;
1806 }
1807
1808 static int write_note_info(struct elf_note_info *info,
1809 struct file *file, loff_t *foffset)
1810 {
1811 int i;
1812 struct list_head *t;
1813
1814 for (i = 0; i < info->numnote; i++)
1815 if (!writenote(info->notes + i, file, foffset))
1816 return 0;
1817
1818 /* write out the thread status notes section */
1819 list_for_each(t, &info->thread_list) {
1820 struct elf_thread_status *tmp =
1821 list_entry(t, struct elf_thread_status, list);
1822
1823 for (i = 0; i < tmp->num_notes; i++)
1824 if (!writenote(&tmp->notes[i], file, foffset))
1825 return 0;
1826 }
1827
1828 return 1;
1829 }
1830
1831 static void free_note_info(struct elf_note_info *info)
1832 {
1833 while (!list_empty(&info->thread_list)) {
1834 struct list_head *tmp = info->thread_list.next;
1835 list_del(tmp);
1836 kfree(list_entry(tmp, struct elf_thread_status, list));
1837 }
1838
1839 kfree(info->prstatus);
1840 kfree(info->psinfo);
1841 kfree(info->notes);
1842 kfree(info->fpu);
1843 #ifdef ELF_CORE_COPY_XFPREGS
1844 kfree(info->xfpu);
1845 #endif
1846 }
1847
1848 #endif
1849
1850 static struct vm_area_struct *first_vma(struct task_struct *tsk,
1851 struct vm_area_struct *gate_vma)
1852 {
1853 struct vm_area_struct *ret = tsk->mm->mmap;
1854
1855 if (ret)
1856 return ret;
1857 return gate_vma;
1858 }
1859 /*
1860 * Helper function for iterating across a vma list. It ensures that the caller
1861 * will visit `gate_vma' prior to terminating the search.
1862 */
1863 static struct vm_area_struct *next_vma(struct vm_area_struct *this_vma,
1864 struct vm_area_struct *gate_vma)
1865 {
1866 struct vm_area_struct *ret;
1867
1868 ret = this_vma->vm_next;
1869 if (ret)
1870 return ret;
1871 if (this_vma == gate_vma)
1872 return NULL;
1873 return gate_vma;
1874 }
1875
1876 static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
1877 elf_addr_t e_shoff, int segs)
1878 {
1879 elf->e_shoff = e_shoff;
1880 elf->e_shentsize = sizeof(*shdr4extnum);
1881 elf->e_shnum = 1;
1882 elf->e_shstrndx = SHN_UNDEF;
1883
1884 memset(shdr4extnum, 0, sizeof(*shdr4extnum));
1885
1886 shdr4extnum->sh_type = SHT_NULL;
1887 shdr4extnum->sh_size = elf->e_shnum;
1888 shdr4extnum->sh_link = elf->e_shstrndx;
1889 shdr4extnum->sh_info = segs;
1890 }
1891
1892 static size_t elf_core_vma_data_size(struct vm_area_struct *gate_vma,
1893 unsigned long mm_flags)
1894 {
1895 struct vm_area_struct *vma;
1896 size_t size = 0;
1897
1898 for (vma = first_vma(current, gate_vma); vma != NULL;
1899 vma = next_vma(vma, gate_vma))
1900 size += vma_dump_size(vma, mm_flags);
1901 return size;
1902 }
1903
1904 /*
1905 * Actual dumper
1906 *
1907 * This is a two-pass process; first we find the offsets of the bits,
1908 * and then they are actually written out. If we run out of core limit
1909 * we just truncate.
1910 */
1911 static int elf_core_dump(struct coredump_params *cprm)
1912 {
1913 int has_dumped = 0;
1914 mm_segment_t fs;
1915 int segs;
1916 size_t size = 0;
1917 struct vm_area_struct *vma, *gate_vma;
1918 struct elfhdr *elf = NULL;
1919 loff_t offset = 0, dataoff, foffset;
1920 struct elf_note_info info;
1921 struct elf_phdr *phdr4note = NULL;
1922 struct elf_shdr *shdr4extnum = NULL;
1923 Elf_Half e_phnum;
1924 elf_addr_t e_shoff;
1925
1926 /*
1927 * We no longer stop all VM operations.
1928 *
1929 * This is because those proceses that could possibly change map_count
1930 * or the mmap / vma pages are now blocked in do_exit on current
1931 * finishing this core dump.
1932 *
1933 * Only ptrace can touch these memory addresses, but it doesn't change
1934 * the map_count or the pages allocated. So no possibility of crashing
1935 * exists while dumping the mm->vm_next areas to the core file.
1936 */
1937
1938 /* alloc memory for large data structures: too large to be on stack */
1939 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1940 if (!elf)
1941 goto out;
1942 /*
1943 * The number of segs are recored into ELF header as 16bit value.
1944 * Please check DEFAULT_MAX_MAP_COUNT definition when you modify here.
1945 */
1946 segs = current->mm->map_count;
1947 segs += elf_core_extra_phdrs();
1948
1949 gate_vma = get_gate_vma(current->mm);
1950 if (gate_vma != NULL)
1951 segs++;
1952
1953 /* for notes section */
1954 segs++;
1955
1956 /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
1957 * this, kernel supports extended numbering. Have a look at
1958 * include/linux/elf.h for further information. */
1959 e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
1960
1961 /*
1962 * Collect all the non-memory information about the process for the
1963 * notes. This also sets up the file header.
1964 */
1965 if (!fill_note_info(elf, e_phnum, &info, cprm->signr, cprm->regs))
1966 goto cleanup;
1967
1968 has_dumped = 1;
1969 current->flags |= PF_DUMPCORE;
1970
1971 fs = get_fs();
1972 set_fs(KERNEL_DS);
1973
1974 offset += sizeof(*elf); /* Elf header */
1975 offset += segs * sizeof(struct elf_phdr); /* Program headers */
1976 foffset = offset;
1977
1978 /* Write notes phdr entry */
1979 {
1980 size_t sz = get_note_info_size(&info);
1981
1982 sz += elf_coredump_extra_notes_size();
1983
1984 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
1985 if (!phdr4note)
1986 goto end_coredump;
1987
1988 fill_elf_note_phdr(phdr4note, sz, offset);
1989 offset += sz;
1990 }
1991
1992 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1993
1994 offset += elf_core_vma_data_size(gate_vma, cprm->mm_flags);
1995 offset += elf_core_extra_data_size();
1996 e_shoff = offset;
1997
1998 if (e_phnum == PN_XNUM) {
1999 shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
2000 if (!shdr4extnum)
2001 goto end_coredump;
2002 fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
2003 }
2004
2005 offset = dataoff;
2006
2007 size += sizeof(*elf);
2008 if (size > cprm->limit || !dump_write(cprm->file, elf, sizeof(*elf)))
2009 goto end_coredump;
2010
2011 size += sizeof(*phdr4note);
2012 if (size > cprm->limit
2013 || !dump_write(cprm->file, phdr4note, sizeof(*phdr4note)))
2014 goto end_coredump;
2015
2016 /* Write program headers for segments dump */
2017 for (vma = first_vma(current, gate_vma); vma != NULL;
2018 vma = next_vma(vma, gate_vma)) {
2019 struct elf_phdr phdr;
2020
2021 phdr.p_type = PT_LOAD;
2022 phdr.p_offset = offset;
2023 phdr.p_vaddr = vma->vm_start;
2024 phdr.p_paddr = 0;
2025 phdr.p_filesz = vma_dump_size(vma, cprm->mm_flags);
2026 phdr.p_memsz = vma->vm_end - vma->vm_start;
2027 offset += phdr.p_filesz;
2028 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
2029 if (vma->vm_flags & VM_WRITE)
2030 phdr.p_flags |= PF_W;
2031 if (vma->vm_flags & VM_EXEC)
2032 phdr.p_flags |= PF_X;
2033 phdr.p_align = ELF_EXEC_PAGESIZE;
2034
2035 size += sizeof(phdr);
2036 if (size > cprm->limit
2037 || !dump_write(cprm->file, &phdr, sizeof(phdr)))
2038 goto end_coredump;
2039 }
2040
2041 if (!elf_core_write_extra_phdrs(cprm->file, offset, &size, cprm->limit))
2042 goto end_coredump;
2043
2044 /* write out the notes section */
2045 if (!write_note_info(&info, cprm->file, &foffset))
2046 goto end_coredump;
2047
2048 if (elf_coredump_extra_notes_write(cprm->file, &foffset))
2049 goto end_coredump;
2050
2051 /* Align to page */
2052 if (!dump_seek(cprm->file, dataoff - foffset))
2053 goto end_coredump;
2054
2055 for (vma = first_vma(current, gate_vma); vma != NULL;
2056 vma = next_vma(vma, gate_vma)) {
2057 unsigned long addr;
2058 unsigned long end;
2059
2060 end = vma->vm_start + vma_dump_size(vma, cprm->mm_flags);
2061
2062 for (addr = vma->vm_start; addr < end; addr += PAGE_SIZE) {
2063 struct page *page;
2064 int stop;
2065
2066 page = get_dump_page(addr);
2067 if (page) {
2068 void *kaddr = kmap(page);
2069 stop = ((size += PAGE_SIZE) > cprm->limit) ||
2070 !dump_write(cprm->file, kaddr,
2071 PAGE_SIZE);
2072 kunmap(page);
2073 page_cache_release(page);
2074 } else
2075 stop = !dump_seek(cprm->file, PAGE_SIZE);
2076 if (stop)
2077 goto end_coredump;
2078 }
2079 }
2080
2081 if (!elf_core_write_extra_data(cprm->file, &size, cprm->limit))
2082 goto end_coredump;
2083
2084 if (e_phnum == PN_XNUM) {
2085 size += sizeof(*shdr4extnum);
2086 if (size > cprm->limit
2087 || !dump_write(cprm->file, shdr4extnum,
2088 sizeof(*shdr4extnum)))
2089 goto end_coredump;
2090 }
2091
2092 end_coredump:
2093 set_fs(fs);
2094
2095 cleanup:
2096 free_note_info(&info);
2097 kfree(shdr4extnum);
2098 kfree(phdr4note);
2099 kfree(elf);
2100 out:
2101 return has_dumped;
2102 }
2103
2104 #endif /* CONFIG_ELF_CORE */
2105
2106 static int __init init_elf_binfmt(void)
2107 {
2108 register_binfmt(&elf_format);
2109 return 0;
2110 }
2111
2112 static void __exit exit_elf_binfmt(void)
2113 {
2114 /* Remove the COFF and ELF loaders. */
2115 unregister_binfmt(&elf_format);
2116 }
2117
2118 core_initcall(init_elf_binfmt);
2119 module_exit(exit_elf_binfmt);
2120 MODULE_LICENSE("GPL");