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-rw-r--r--fs/binfmt_elf_fdpic.c980
1 files changed, 842 insertions, 138 deletions
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index eba4e23b9ca0..2f3365829229 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -1,6 +1,6 @@
1/* binfmt_elf_fdpic.c: FDPIC ELF binary format 1/* binfmt_elf_fdpic.c: FDPIC ELF binary format
2 * 2 *
3 * Copyright (C) 2003, 2004 Red Hat, Inc. All Rights Reserved. 3 * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com) 4 * Written by David Howells (dhowells@redhat.com)
5 * Derived from binfmt_elf.c 5 * Derived from binfmt_elf.c
6 * 6 *
@@ -24,7 +24,9 @@
24#include <linux/file.h> 24#include <linux/file.h>
25#include <linux/fcntl.h> 25#include <linux/fcntl.h>
26#include <linux/slab.h> 26#include <linux/slab.h>
27#include <linux/pagemap.h>
27#include <linux/highmem.h> 28#include <linux/highmem.h>
29#include <linux/highuid.h>
28#include <linux/personality.h> 30#include <linux/personality.h>
29#include <linux/ptrace.h> 31#include <linux/ptrace.h>
30#include <linux/init.h> 32#include <linux/init.h>
@@ -48,45 +50,59 @@ typedef char *elf_caddr_t;
48#define kdebug(fmt, ...) do {} while(0) 50#define kdebug(fmt, ...) do {} while(0)
49#endif 51#endif
50 52
53#if 0
54#define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
55#else
56#define kdcore(fmt, ...) do {} while(0)
57#endif
58
51MODULE_LICENSE("GPL"); 59MODULE_LICENSE("GPL");
52 60
53static int load_elf_fdpic_binary(struct linux_binprm *bprm, struct pt_regs *regs); 61static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *);
54//static int load_elf_fdpic_library(struct file *); 62static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *);
55static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, struct file *file); 63static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *,
56static int elf_fdpic_map_file(struct elf_fdpic_params *params, 64 struct mm_struct *, const char *);
57 struct file *file,
58 struct mm_struct *mm,
59 const char *what);
60 65
61static int create_elf_fdpic_tables(struct linux_binprm *bprm, 66static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *,
62 struct mm_struct *mm, 67 struct elf_fdpic_params *,
63 struct elf_fdpic_params *exec_params, 68 struct elf_fdpic_params *);
64 struct elf_fdpic_params *interp_params);
65 69
66#ifndef CONFIG_MMU 70#ifndef CONFIG_MMU
67static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm, unsigned long *_sp); 71static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *,
68static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *params, 72 unsigned long *);
69 struct file *file, 73static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *,
70 struct mm_struct *mm); 74 struct file *,
75 struct mm_struct *);
71#endif 76#endif
72 77
73static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params, 78static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
74 struct file *file, 79 struct file *, struct mm_struct *);
75 struct mm_struct *mm); 80
81#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
82static int elf_fdpic_core_dump(long, struct pt_regs *, struct file *);
83#endif
76 84
77static struct linux_binfmt elf_fdpic_format = { 85static struct linux_binfmt elf_fdpic_format = {
78 .module = THIS_MODULE, 86 .module = THIS_MODULE,
79 .load_binary = load_elf_fdpic_binary, 87 .load_binary = load_elf_fdpic_binary,
80// .load_shlib = load_elf_fdpic_library, 88#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
81// .core_dump = elf_fdpic_core_dump, 89 .core_dump = elf_fdpic_core_dump,
90#endif
82 .min_coredump = ELF_EXEC_PAGESIZE, 91 .min_coredump = ELF_EXEC_PAGESIZE,
83}; 92};
84 93
85static int __init init_elf_fdpic_binfmt(void) { return register_binfmt(&elf_fdpic_format); } 94static int __init init_elf_fdpic_binfmt(void)
86static void __exit exit_elf_fdpic_binfmt(void) { unregister_binfmt(&elf_fdpic_format); } 95{
96 return register_binfmt(&elf_fdpic_format);
97}
98
99static void __exit exit_elf_fdpic_binfmt(void)
100{
101 unregister_binfmt(&elf_fdpic_format);
102}
87 103
88module_init(init_elf_fdpic_binfmt) 104core_initcall(init_elf_fdpic_binfmt);
89module_exit(exit_elf_fdpic_binfmt) 105module_exit(exit_elf_fdpic_binfmt);
90 106
91static int is_elf_fdpic(struct elfhdr *hdr, struct file *file) 107static int is_elf_fdpic(struct elfhdr *hdr, struct file *file)
92{ 108{
@@ -105,7 +121,8 @@ static int is_elf_fdpic(struct elfhdr *hdr, struct file *file)
105/* 121/*
106 * read the program headers table into memory 122 * read the program headers table into memory
107 */ 123 */
108static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, struct file *file) 124static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,
125 struct file *file)
109{ 126{
110 struct elf32_phdr *phdr; 127 struct elf32_phdr *phdr;
111 unsigned long size; 128 unsigned long size;
@@ -121,7 +138,8 @@ static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, struct file *f
121 if (!params->phdrs) 138 if (!params->phdrs)
122 return -ENOMEM; 139 return -ENOMEM;
123 140
124 retval = kernel_read(file, params->hdr.e_phoff, (char *) params->phdrs, size); 141 retval = kernel_read(file, params->hdr.e_phoff,
142 (char *) params->phdrs, size);
125 if (retval < 0) 143 if (retval < 0)
126 return retval; 144 return retval;
127 145
@@ -141,17 +159,24 @@ static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, struct file *f
141 } 159 }
142 160
143 return 0; 161 return 0;
144} /* end elf_fdpic_fetch_phdrs() */ 162}
145 163
146/*****************************************************************************/ 164/*****************************************************************************/
147/* 165/*
148 * load an fdpic binary into various bits of memory 166 * load an fdpic binary into various bits of memory
149 */ 167 */
150static int load_elf_fdpic_binary(struct linux_binprm *bprm, struct pt_regs *regs) 168static int load_elf_fdpic_binary(struct linux_binprm *bprm,
169 struct pt_regs *regs)
151{ 170{
152 struct elf_fdpic_params exec_params, interp_params; 171 struct elf_fdpic_params exec_params, interp_params;
153 struct elf_phdr *phdr; 172 struct elf_phdr *phdr;
154 unsigned long stack_size; 173 unsigned long stack_size, entryaddr;
174#ifndef CONFIG_MMU
175 unsigned long fullsize;
176#endif
177#ifdef ELF_FDPIC_PLAT_INIT
178 unsigned long dynaddr;
179#endif
155 struct file *interpreter = NULL; /* to shut gcc up */ 180 struct file *interpreter = NULL; /* to shut gcc up */
156 char *interpreter_name = NULL; 181 char *interpreter_name = NULL;
157 int executable_stack; 182 int executable_stack;
@@ -212,7 +237,8 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm, struct pt_regs *regs
212 goto error; 237 goto error;
213 } 238 }
214 239
215 retval = kernel_read(interpreter, 0, bprm->buf, BINPRM_BUF_SIZE); 240 retval = kernel_read(interpreter, 0, bprm->buf,
241 BINPRM_BUF_SIZE);
216 if (retval < 0) 242 if (retval < 0)
217 goto error; 243 goto error;
218 244
@@ -295,7 +321,8 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm, struct pt_regs *regs
295 &current->mm->start_stack, 321 &current->mm->start_stack,
296 &current->mm->start_brk); 322 &current->mm->start_brk);
297 323
298 retval = setup_arg_pages(bprm, current->mm->start_stack, executable_stack); 324 retval = setup_arg_pages(bprm, current->mm->start_stack,
325 executable_stack);
299 if (retval < 0) { 326 if (retval < 0) {
300 send_sig(SIGKILL, current, 0); 327 send_sig(SIGKILL, current, 0);
301 goto error_kill; 328 goto error_kill;
@@ -303,7 +330,8 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm, struct pt_regs *regs
303#endif 330#endif
304 331
305 /* load the executable and interpreter into memory */ 332 /* load the executable and interpreter into memory */
306 retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm, "executable"); 333 retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm,
334 "executable");
307 if (retval < 0) 335 if (retval < 0)
308 goto error_kill; 336 goto error_kill;
309 337
@@ -324,7 +352,8 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm, struct pt_regs *regs
324 if (!current->mm->start_brk) 352 if (!current->mm->start_brk)
325 current->mm->start_brk = current->mm->end_data; 353 current->mm->start_brk = current->mm->end_data;
326 354
327 current->mm->brk = current->mm->start_brk = PAGE_ALIGN(current->mm->start_brk); 355 current->mm->brk = current->mm->start_brk =
356 PAGE_ALIGN(current->mm->start_brk);
328 357
329#else 358#else
330 /* create a stack and brk area big enough for everyone 359 /* create a stack and brk area big enough for everyone
@@ -336,47 +365,45 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm, struct pt_regs *regs
336 stack_size = PAGE_SIZE * 2; 365 stack_size = PAGE_SIZE * 2;
337 366
338 down_write(&current->mm->mmap_sem); 367 down_write(&current->mm->mmap_sem);
339 current->mm->start_brk = do_mmap(NULL, 368 current->mm->start_brk = do_mmap(NULL, 0, stack_size,
340 0,
341 stack_size,
342 PROT_READ | PROT_WRITE | PROT_EXEC, 369 PROT_READ | PROT_WRITE | PROT_EXEC,
343 MAP_PRIVATE | MAP_ANON | MAP_GROWSDOWN, 370 MAP_PRIVATE | MAP_ANON | MAP_GROWSDOWN,
344 0); 371 0);
345 372
346 if (IS_ERR((void *) current->mm->start_brk)) { 373 if (IS_ERR_VALUE(current->mm->start_brk)) {
347 up_write(&current->mm->mmap_sem); 374 up_write(&current->mm->mmap_sem);
348 retval = current->mm->start_brk; 375 retval = current->mm->start_brk;
349 current->mm->start_brk = 0; 376 current->mm->start_brk = 0;
350 goto error_kill; 377 goto error_kill;
351 } 378 }
352 379
353 if (do_mremap(current->mm->start_brk, 380 /* expand the stack mapping to use up the entire allocation granule */
354 stack_size, 381 fullsize = ksize((char *) current->mm->start_brk);
355 ksize((char *) current->mm->start_brk), 382 if (!IS_ERR_VALUE(do_mremap(current->mm->start_brk, stack_size,
356 0, 0 383 fullsize, 0, 0)))
357 ) == current->mm->start_brk 384 stack_size = fullsize;
358 )
359 stack_size = ksize((char *) current->mm->start_brk);
360 up_write(&current->mm->mmap_sem); 385 up_write(&current->mm->mmap_sem);
361 386
362 current->mm->brk = current->mm->start_brk; 387 current->mm->brk = current->mm->start_brk;
363 current->mm->context.end_brk = current->mm->start_brk; 388 current->mm->context.end_brk = current->mm->start_brk;
364 current->mm->context.end_brk += (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0; 389 current->mm->context.end_brk +=
390 (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0;
365 current->mm->start_stack = current->mm->start_brk + stack_size; 391 current->mm->start_stack = current->mm->start_brk + stack_size;
366#endif 392#endif
367 393
368 compute_creds(bprm); 394 compute_creds(bprm);
369 current->flags &= ~PF_FORKNOEXEC; 395 current->flags &= ~PF_FORKNOEXEC;
370 if (create_elf_fdpic_tables(bprm, current->mm, &exec_params, &interp_params) < 0) 396 if (create_elf_fdpic_tables(bprm, current->mm,
397 &exec_params, &interp_params) < 0)
371 goto error_kill; 398 goto error_kill;
372 399
373 kdebug("- start_code %lx", (long) current->mm->start_code); 400 kdebug("- start_code %lx", current->mm->start_code);
374 kdebug("- end_code %lx", (long) current->mm->end_code); 401 kdebug("- end_code %lx", current->mm->end_code);
375 kdebug("- start_data %lx", (long) current->mm->start_data); 402 kdebug("- start_data %lx", current->mm->start_data);
376 kdebug("- end_data %lx", (long) current->mm->end_data); 403 kdebug("- end_data %lx", current->mm->end_data);
377 kdebug("- start_brk %lx", (long) current->mm->start_brk); 404 kdebug("- start_brk %lx", current->mm->start_brk);
378 kdebug("- brk %lx", (long) current->mm->brk); 405 kdebug("- brk %lx", current->mm->brk);
379 kdebug("- start_stack %lx", (long) current->mm->start_stack); 406 kdebug("- start_stack %lx", current->mm->start_stack);
380 407
381#ifdef ELF_FDPIC_PLAT_INIT 408#ifdef ELF_FDPIC_PLAT_INIT
382 /* 409 /*
@@ -385,21 +412,18 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm, struct pt_regs *regs
385 * example. This macro performs whatever initialization to 412 * example. This macro performs whatever initialization to
386 * the regs structure is required. 413 * the regs structure is required.
387 */ 414 */
388 ELF_FDPIC_PLAT_INIT(regs, 415 dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr;
389 exec_params.map_addr, 416 ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr,
390 interp_params.map_addr, 417 dynaddr);
391 interp_params.dynamic_addr ?: exec_params.dynamic_addr
392 );
393#endif 418#endif
394 419
395 /* everything is now ready... get the userspace context ready to roll */ 420 /* everything is now ready... get the userspace context ready to roll */
396 start_thread(regs, 421 entryaddr = interp_params.entry_addr ?: exec_params.entry_addr;
397 interp_params.entry_addr ?: exec_params.entry_addr, 422 start_thread(regs, entryaddr, current->mm->start_stack);
398 current->mm->start_stack);
399 423
400 if (unlikely(current->ptrace & PT_PTRACED)) { 424 if (unlikely(current->ptrace & PT_PTRACED)) {
401 if (current->ptrace & PT_TRACE_EXEC) 425 if (current->ptrace & PT_TRACE_EXEC)
402 ptrace_notify ((PTRACE_EVENT_EXEC << 8) | SIGTRAP); 426 ptrace_notify((PTRACE_EVENT_EXEC << 8) | SIGTRAP);
403 else 427 else
404 send_sig(SIGTRAP, current, 0); 428 send_sig(SIGTRAP, current, 0);
405 } 429 }
@@ -419,11 +443,11 @@ error:
419 return retval; 443 return retval;
420 444
421 /* unrecoverable error - kill the process */ 445 /* unrecoverable error - kill the process */
422 error_kill: 446error_kill:
423 send_sig(SIGSEGV, current, 0); 447 send_sig(SIGSEGV, current, 0);
424 goto error; 448 goto error;
425 449
426} /* end load_elf_fdpic_binary() */ 450}
427 451
428/*****************************************************************************/ 452/*****************************************************************************/
429/* 453/*
@@ -459,6 +483,7 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
459 */ 483 */
460 hwcap = ELF_HWCAP; 484 hwcap = ELF_HWCAP;
461 k_platform = ELF_PLATFORM; 485 k_platform = ELF_PLATFORM;
486 u_platform = NULL;
462 487
463 if (k_platform) { 488 if (k_platform) {
464 platform_len = strlen(k_platform) + 1; 489 platform_len = strlen(k_platform) + 1;
@@ -470,11 +495,11 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
470 495
471#if defined(__i386__) && defined(CONFIG_SMP) 496#if defined(__i386__) && defined(CONFIG_SMP)
472 /* in some cases (e.g. Hyper-Threading), we want to avoid L1 evictions 497 /* in some cases (e.g. Hyper-Threading), we want to avoid L1 evictions
473 * by the processes running on the same package. One thing we can do 498 * by the processes running on the same package. One thing we can do is
474 * is to shuffle the initial stack for them. 499 * to shuffle the initial stack for them.
475 * 500 *
476 * the conditionals here are unneeded, but kept in to make the 501 * the conditionals here are unneeded, but kept in to make the code
477 * code behaviour the same as pre change unless we have hyperthreaded 502 * behaviour the same as pre change unless we have hyperthreaded
478 * processors. This keeps Mr Marcelo Person happier but should be 503 * processors. This keeps Mr Marcelo Person happier but should be
479 * removed for 2.5 504 * removed for 2.5
480 */ 505 */
@@ -497,11 +522,13 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
497 522
498 if (interp_params->loadmap) { 523 if (interp_params->loadmap) {
499 len = sizeof(struct elf32_fdpic_loadmap); 524 len = sizeof(struct elf32_fdpic_loadmap);
500 len += sizeof(struct elf32_fdpic_loadseg) * interp_params->loadmap->nsegs; 525 len += sizeof(struct elf32_fdpic_loadseg) *
526 interp_params->loadmap->nsegs;
501 sp = (sp - len) & ~7UL; 527 sp = (sp - len) & ~7UL;
502 interp_params->map_addr = sp; 528 interp_params->map_addr = sp;
503 529
504 if (copy_to_user((void __user *) sp, interp_params->loadmap, len) != 0) 530 if (copy_to_user((void __user *) sp, interp_params->loadmap,
531 len) != 0)
505 return -EFAULT; 532 return -EFAULT;
506 533
507 current->mm->context.interp_fdpic_loadmap = (unsigned long) sp; 534 current->mm->context.interp_fdpic_loadmap = (unsigned long) sp;
@@ -525,34 +552,37 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
525 sp -= sp & 15UL; 552 sp -= sp & 15UL;
526 553
527 /* put the ELF interpreter info on the stack */ 554 /* put the ELF interpreter info on the stack */
528#define NEW_AUX_ENT(nr, id, val) \ 555#define NEW_AUX_ENT(nr, id, val) \
529 do { \ 556 do { \
530 struct { unsigned long _id, _val; } __user *ent = (void __user *) csp; \ 557 struct { unsigned long _id, _val; } __user *ent; \
531 __put_user((id), &ent[nr]._id); \ 558 \
532 __put_user((val), &ent[nr]._val); \ 559 ent = (void __user *) csp; \
560 __put_user((id), &ent[nr]._id); \
561 __put_user((val), &ent[nr]._val); \
533 } while (0) 562 } while (0)
534 563
535 csp -= 2 * sizeof(unsigned long); 564 csp -= 2 * sizeof(unsigned long);
536 NEW_AUX_ENT(0, AT_NULL, 0); 565 NEW_AUX_ENT(0, AT_NULL, 0);
537 if (k_platform) { 566 if (k_platform) {
538 csp -= 2 * sizeof(unsigned long); 567 csp -= 2 * sizeof(unsigned long);
539 NEW_AUX_ENT(0, AT_PLATFORM, (elf_addr_t)(unsigned long) u_platform); 568 NEW_AUX_ENT(0, AT_PLATFORM,
569 (elf_addr_t) (unsigned long) u_platform);
540 } 570 }
541 571
542 csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long); 572 csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long);
543 NEW_AUX_ENT( 0, AT_HWCAP, hwcap); 573 NEW_AUX_ENT( 0, AT_HWCAP, hwcap);
544 NEW_AUX_ENT( 1, AT_PAGESZ, PAGE_SIZE); 574 NEW_AUX_ENT( 1, AT_PAGESZ, PAGE_SIZE);
545 NEW_AUX_ENT( 2, AT_CLKTCK, CLOCKS_PER_SEC); 575 NEW_AUX_ENT( 2, AT_CLKTCK, CLOCKS_PER_SEC);
546 NEW_AUX_ENT( 3, AT_PHDR, exec_params->ph_addr); 576 NEW_AUX_ENT( 3, AT_PHDR, exec_params->ph_addr);
547 NEW_AUX_ENT( 4, AT_PHENT, sizeof(struct elf_phdr)); 577 NEW_AUX_ENT( 4, AT_PHENT, sizeof(struct elf_phdr));
548 NEW_AUX_ENT( 5, AT_PHNUM, exec_params->hdr.e_phnum); 578 NEW_AUX_ENT( 5, AT_PHNUM, exec_params->hdr.e_phnum);
549 NEW_AUX_ENT( 6, AT_BASE, interp_params->elfhdr_addr); 579 NEW_AUX_ENT( 6, AT_BASE, interp_params->elfhdr_addr);
550 NEW_AUX_ENT( 7, AT_FLAGS, 0); 580 NEW_AUX_ENT( 7, AT_FLAGS, 0);
551 NEW_AUX_ENT( 8, AT_ENTRY, exec_params->entry_addr); 581 NEW_AUX_ENT( 8, AT_ENTRY, exec_params->entry_addr);
552 NEW_AUX_ENT( 9, AT_UID, (elf_addr_t) current->uid); 582 NEW_AUX_ENT( 9, AT_UID, (elf_addr_t) current->uid);
553 NEW_AUX_ENT(10, AT_EUID, (elf_addr_t) current->euid); 583 NEW_AUX_ENT(10, AT_EUID, (elf_addr_t) current->euid);
554 NEW_AUX_ENT(11, AT_GID, (elf_addr_t) current->gid); 584 NEW_AUX_ENT(11, AT_GID, (elf_addr_t) current->gid);
555 NEW_AUX_ENT(12, AT_EGID, (elf_addr_t) current->egid); 585 NEW_AUX_ENT(12, AT_EGID, (elf_addr_t) current->egid);
556 586
557#ifdef ARCH_DLINFO 587#ifdef ARCH_DLINFO
558 /* ARCH_DLINFO must come last so platform specific code can enforce 588 /* ARCH_DLINFO must come last so platform specific code can enforce
@@ -578,7 +608,8 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
578#ifdef CONFIG_MMU 608#ifdef CONFIG_MMU
579 current->mm->arg_start = bprm->p; 609 current->mm->arg_start = bprm->p;
580#else 610#else
581 current->mm->arg_start = current->mm->start_stack - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p); 611 current->mm->arg_start = current->mm->start_stack -
612 (MAX_ARG_PAGES * PAGE_SIZE - bprm->p);
582#endif 613#endif
583 614
584 p = (char __user *) current->mm->arg_start; 615 p = (char __user *) current->mm->arg_start;
@@ -606,7 +637,7 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
606 637
607 mm->start_stack = (unsigned long) sp; 638 mm->start_stack = (unsigned long) sp;
608 return 0; 639 return 0;
609} /* end create_elf_fdpic_tables() */ 640}
610 641
611/*****************************************************************************/ 642/*****************************************************************************/
612/* 643/*
@@ -614,7 +645,8 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
614 * the stack 645 * the stack
615 */ 646 */
616#ifndef CONFIG_MMU 647#ifndef CONFIG_MMU
617static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm, unsigned long *_sp) 648static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm,
649 unsigned long *_sp)
618{ 650{
619 unsigned long index, stop, sp; 651 unsigned long index, stop, sp;
620 char *src; 652 char *src;
@@ -635,9 +667,9 @@ static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm, unsigned
635 667
636 *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15; 668 *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15;
637 669
638 out: 670out:
639 return ret; 671 return ret;
640} /* end elf_fdpic_transfer_args_to_stack() */ 672}
641#endif 673#endif
642 674
643/*****************************************************************************/ 675/*****************************************************************************/
@@ -712,17 +744,18 @@ static int elf_fdpic_map_file(struct elf_fdpic_params *params,
712 seg = loadmap->segs; 744 seg = loadmap->segs;
713 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { 745 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
714 if (params->hdr.e_entry >= seg->p_vaddr && 746 if (params->hdr.e_entry >= seg->p_vaddr &&
715 params->hdr.e_entry < seg->p_vaddr + seg->p_memsz 747 params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) {
716 ) {
717 params->entry_addr = 748 params->entry_addr =
718 (params->hdr.e_entry - seg->p_vaddr) + seg->addr; 749 (params->hdr.e_entry - seg->p_vaddr) +
750 seg->addr;
719 break; 751 break;
720 } 752 }
721 } 753 }
722 } 754 }
723 755
724 /* determine where the program header table has wound up if mapped */ 756 /* determine where the program header table has wound up if mapped */
725 stop = params->hdr.e_phoff + params->hdr.e_phnum * sizeof (struct elf_phdr); 757 stop = params->hdr.e_phoff;
758 stop += params->hdr.e_phnum * sizeof (struct elf_phdr);
726 phdr = params->phdrs; 759 phdr = params->phdrs;
727 760
728 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { 761 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
@@ -736,9 +769,11 @@ static int elf_fdpic_map_file(struct elf_fdpic_params *params,
736 seg = loadmap->segs; 769 seg = loadmap->segs;
737 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { 770 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
738 if (phdr->p_vaddr >= seg->p_vaddr && 771 if (phdr->p_vaddr >= seg->p_vaddr &&
739 phdr->p_vaddr + phdr->p_filesz <= seg->p_vaddr + seg->p_memsz 772 phdr->p_vaddr + phdr->p_filesz <=
740 ) { 773 seg->p_vaddr + seg->p_memsz) {
741 params->ph_addr = (phdr->p_vaddr - seg->p_vaddr) + seg->addr + 774 params->ph_addr =
775 (phdr->p_vaddr - seg->p_vaddr) +
776 seg->addr +
742 params->hdr.e_phoff - phdr->p_offset; 777 params->hdr.e_phoff - phdr->p_offset;
743 break; 778 break;
744 } 779 }
@@ -755,18 +790,22 @@ static int elf_fdpic_map_file(struct elf_fdpic_params *params,
755 seg = loadmap->segs; 790 seg = loadmap->segs;
756 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) { 791 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
757 if (phdr->p_vaddr >= seg->p_vaddr && 792 if (phdr->p_vaddr >= seg->p_vaddr &&
758 phdr->p_vaddr + phdr->p_memsz <= seg->p_vaddr + seg->p_memsz 793 phdr->p_vaddr + phdr->p_memsz <=
759 ) { 794 seg->p_vaddr + seg->p_memsz) {
760 params->dynamic_addr = (phdr->p_vaddr - seg->p_vaddr) + seg->addr; 795 params->dynamic_addr =
761 796 (phdr->p_vaddr - seg->p_vaddr) +
762 /* check the dynamic section contains at least one item, and that 797 seg->addr;
763 * the last item is a NULL entry */ 798
799 /* check the dynamic section contains at least
800 * one item, and that the last item is a NULL
801 * entry */
764 if (phdr->p_memsz == 0 || 802 if (phdr->p_memsz == 0 ||
765 phdr->p_memsz % sizeof(Elf32_Dyn) != 0) 803 phdr->p_memsz % sizeof(Elf32_Dyn) != 0)
766 goto dynamic_error; 804 goto dynamic_error;
767 805
768 tmp = phdr->p_memsz / sizeof(Elf32_Dyn); 806 tmp = phdr->p_memsz / sizeof(Elf32_Dyn);
769 if (((Elf32_Dyn *) params->dynamic_addr)[tmp - 1].d_tag != 0) 807 if (((Elf32_Dyn *)
808 params->dynamic_addr)[tmp - 1].d_tag != 0)
770 goto dynamic_error; 809 goto dynamic_error;
771 break; 810 break;
772 } 811 }
@@ -775,8 +814,8 @@ static int elf_fdpic_map_file(struct elf_fdpic_params *params,
775 } 814 }
776 815
777 /* now elide adjacent segments in the load map on MMU linux 816 /* now elide adjacent segments in the load map on MMU linux
778 * - on uClinux the holes between may actually be filled with system stuff or stuff from 817 * - on uClinux the holes between may actually be filled with system
779 * other processes 818 * stuff or stuff from other processes
780 */ 819 */
781#ifdef CONFIG_MMU 820#ifdef CONFIG_MMU
782 nloads = loadmap->nsegs; 821 nloads = loadmap->nsegs;
@@ -787,7 +826,9 @@ static int elf_fdpic_map_file(struct elf_fdpic_params *params,
787 if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) { 826 if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) {
788 load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz); 827 load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz);
789 if (load_addr == (seg->addr & PAGE_MASK)) { 828 if (load_addr == (seg->addr & PAGE_MASK)) {
790 mseg->p_memsz += load_addr - (mseg->addr + mseg->p_memsz); 829 mseg->p_memsz +=
830 load_addr -
831 (mseg->addr + mseg->p_memsz);
791 mseg->p_memsz += seg->addr & ~PAGE_MASK; 832 mseg->p_memsz += seg->addr & ~PAGE_MASK;
792 mseg->p_memsz += seg->p_memsz; 833 mseg->p_memsz += seg->p_memsz;
793 loadmap->nsegs--; 834 loadmap->nsegs--;
@@ -815,20 +856,21 @@ static int elf_fdpic_map_file(struct elf_fdpic_params *params,
815 856
816 return 0; 857 return 0;
817 858
818 dynamic_error: 859dynamic_error:
819 printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n", 860 printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n",
820 what, file->f_dentry->d_inode->i_ino); 861 what, file->f_dentry->d_inode->i_ino);
821 return -ELIBBAD; 862 return -ELIBBAD;
822} /* end elf_fdpic_map_file() */ 863}
823 864
824/*****************************************************************************/ 865/*****************************************************************************/
825/* 866/*
826 * map a file with constant displacement under uClinux 867 * map a file with constant displacement under uClinux
827 */ 868 */
828#ifndef CONFIG_MMU 869#ifndef CONFIG_MMU
829static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *params, 870static int elf_fdpic_map_file_constdisp_on_uclinux(
830 struct file *file, 871 struct elf_fdpic_params *params,
831 struct mm_struct *mm) 872 struct file *file,
873 struct mm_struct *mm)
832{ 874{
833 struct elf32_fdpic_loadseg *seg; 875 struct elf32_fdpic_loadseg *seg;
834 struct elf32_phdr *phdr; 876 struct elf32_phdr *phdr;
@@ -839,7 +881,8 @@ static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *para
839 load_addr = params->load_addr; 881 load_addr = params->load_addr;
840 seg = params->loadmap->segs; 882 seg = params->loadmap->segs;
841 883
842 /* determine the bounds of the contiguous overall allocation we must make */ 884 /* determine the bounds of the contiguous overall allocation we must
885 * make */
843 phdr = params->phdrs; 886 phdr = params->phdrs;
844 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) { 887 for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
845 if (params->phdrs[loop].p_type != PT_LOAD) 888 if (params->phdrs[loop].p_type != PT_LOAD)
@@ -860,7 +903,7 @@ static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *para
860 maddr = do_mmap(NULL, load_addr, top - base, 903 maddr = do_mmap(NULL, load_addr, top - base,
861 PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0); 904 PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0);
862 up_write(&mm->mmap_sem); 905 up_write(&mm->mmap_sem);
863 if (IS_ERR((void *) maddr)) 906 if (IS_ERR_VALUE(maddr))
864 return (int) maddr; 907 return (int) maddr;
865 908
866 if (load_addr != 0) 909 if (load_addr != 0)
@@ -878,7 +921,8 @@ static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *para
878 seg->p_vaddr = phdr->p_vaddr; 921 seg->p_vaddr = phdr->p_vaddr;
879 seg->p_memsz = phdr->p_memsz; 922 seg->p_memsz = phdr->p_memsz;
880 923
881 ret = file->f_op->read(file, (void *) seg->addr, phdr->p_filesz, &fpos); 924 ret = file->f_op->read(file, (void *) seg->addr,
925 phdr->p_filesz, &fpos);
882 if (ret < 0) 926 if (ret < 0)
883 return ret; 927 return ret;
884 928
@@ -895,8 +939,7 @@ static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *para
895 if (phdr->p_flags & PF_X) { 939 if (phdr->p_flags & PF_X) {
896 mm->start_code = seg->addr; 940 mm->start_code = seg->addr;
897 mm->end_code = seg->addr + phdr->p_memsz; 941 mm->end_code = seg->addr + phdr->p_memsz;
898 } 942 } else if (!mm->start_data) {
899 else if (!mm->start_data) {
900 mm->start_data = seg->addr; 943 mm->start_data = seg->addr;
901#ifndef CONFIG_MMU 944#ifndef CONFIG_MMU
902 mm->end_data = seg->addr + phdr->p_memsz; 945 mm->end_data = seg->addr + phdr->p_memsz;
@@ -913,7 +956,7 @@ static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *para
913 } 956 }
914 957
915 return 0; 958 return 0;
916} /* end elf_fdpic_map_file_constdisp_on_uclinux() */ 959}
917#endif 960#endif
918 961
919/*****************************************************************************/ 962/*****************************************************************************/
@@ -974,14 +1017,14 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
974 1017
975 case ELF_FDPIC_FLAG_CONSTDISP: 1018 case ELF_FDPIC_FLAG_CONSTDISP:
976 /* constant displacement 1019 /* constant displacement
977 * - can be mapped anywhere, but must be mapped as a unit 1020 * - can be mapped anywhere, but must be mapped as a
1021 * unit
978 */ 1022 */
979 if (!dvset) { 1023 if (!dvset) {
980 maddr = load_addr; 1024 maddr = load_addr;
981 delta_vaddr = phdr->p_vaddr; 1025 delta_vaddr = phdr->p_vaddr;
982 dvset = 1; 1026 dvset = 1;
983 } 1027 } else {
984 else {
985 maddr = load_addr + phdr->p_vaddr - delta_vaddr; 1028 maddr = load_addr + phdr->p_vaddr - delta_vaddr;
986 flags |= MAP_FIXED; 1029 flags |= MAP_FIXED;
987 } 1030 }
@@ -1005,13 +1048,14 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
1005 up_write(&mm->mmap_sem); 1048 up_write(&mm->mmap_sem);
1006 1049
1007 kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx", 1050 kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx",
1008 loop, phdr->p_memsz + disp, prot, flags, phdr->p_offset - disp, 1051 loop, phdr->p_memsz + disp, prot, flags,
1009 maddr); 1052 phdr->p_offset - disp, maddr);
1010 1053
1011 if (IS_ERR((void *) maddr)) 1054 if (IS_ERR_VALUE(maddr))
1012 return (int) maddr; 1055 return (int) maddr;
1013 1056
1014 if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == ELF_FDPIC_FLAG_CONTIGUOUS) 1057 if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
1058 ELF_FDPIC_FLAG_CONTIGUOUS)
1015 load_addr += PAGE_ALIGN(phdr->p_memsz + disp); 1059 load_addr += PAGE_ALIGN(phdr->p_memsz + disp);
1016 1060
1017 seg->addr = maddr + disp; 1061 seg->addr = maddr + disp;
@@ -1022,7 +1066,8 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
1022 if (phdr->p_offset == 0) 1066 if (phdr->p_offset == 0)
1023 params->elfhdr_addr = seg->addr; 1067 params->elfhdr_addr = seg->addr;
1024 1068
1025 /* clear the bit between beginning of mapping and beginning of PT_LOAD */ 1069 /* clear the bit between beginning of mapping and beginning of
1070 * PT_LOAD */
1026 if (prot & PROT_WRITE && disp > 0) { 1071 if (prot & PROT_WRITE && disp > 0) {
1027 kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp); 1072 kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp);
1028 clear_user((void __user *) maddr, disp); 1073 clear_user((void __user *) maddr, disp);
@@ -1038,19 +1083,20 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
1038 excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK); 1083 excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK);
1039 1084
1040#ifdef CONFIG_MMU 1085#ifdef CONFIG_MMU
1041
1042 if (excess > excess1) { 1086 if (excess > excess1) {
1043 unsigned long xaddr = maddr + phdr->p_filesz + excess1; 1087 unsigned long xaddr = maddr + phdr->p_filesz + excess1;
1044 unsigned long xmaddr; 1088 unsigned long xmaddr;
1045 1089
1046 flags |= MAP_FIXED | MAP_ANONYMOUS; 1090 flags |= MAP_FIXED | MAP_ANONYMOUS;
1047 down_write(&mm->mmap_sem); 1091 down_write(&mm->mmap_sem);
1048 xmaddr = do_mmap(NULL, xaddr, excess - excess1, prot, flags, 0); 1092 xmaddr = do_mmap(NULL, xaddr, excess - excess1,
1093 prot, flags, 0);
1049 up_write(&mm->mmap_sem); 1094 up_write(&mm->mmap_sem);
1050 1095
1051 kdebug("mmap[%d] <anon>" 1096 kdebug("mmap[%d] <anon>"
1052 " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx", 1097 " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx",
1053 loop, xaddr, excess - excess1, prot, flags, xmaddr); 1098 loop, xaddr, excess - excess1, prot, flags,
1099 xmaddr);
1054 1100
1055 if (xmaddr != xaddr) 1101 if (xmaddr != xaddr)
1056 return -ENOMEM; 1102 return -ENOMEM;
@@ -1059,7 +1105,8 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
1059 if (prot & PROT_WRITE && excess1 > 0) { 1105 if (prot & PROT_WRITE && excess1 > 0) {
1060 kdebug("clear[%d] ad=%lx sz=%lx", 1106 kdebug("clear[%d] ad=%lx sz=%lx",
1061 loop, maddr + phdr->p_filesz, excess1); 1107 loop, maddr + phdr->p_filesz, excess1);
1062 clear_user((void __user *) maddr + phdr->p_filesz, excess1); 1108 clear_user((void __user *) maddr + phdr->p_filesz,
1109 excess1);
1063 } 1110 }
1064 1111
1065#else 1112#else
@@ -1074,8 +1121,7 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
1074 if (phdr->p_flags & PF_X) { 1121 if (phdr->p_flags & PF_X) {
1075 mm->start_code = maddr; 1122 mm->start_code = maddr;
1076 mm->end_code = maddr + phdr->p_memsz; 1123 mm->end_code = maddr + phdr->p_memsz;
1077 } 1124 } else if (!mm->start_data) {
1078 else if (!mm->start_data) {
1079 mm->start_data = maddr; 1125 mm->start_data = maddr;
1080 mm->end_data = maddr + phdr->p_memsz; 1126 mm->end_data = maddr + phdr->p_memsz;
1081 } 1127 }
@@ -1085,4 +1131,662 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
1085 } 1131 }
1086 1132
1087 return 0; 1133 return 0;
1088} /* end elf_fdpic_map_file_by_direct_mmap() */ 1134}
1135
1136/*****************************************************************************/
1137/*
1138 * ELF-FDPIC core dumper
1139 *
1140 * Modelled on fs/exec.c:aout_core_dump()
1141 * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1142 *
1143 * Modelled on fs/binfmt_elf.c core dumper
1144 */
1145#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
1146
1147/*
1148 * These are the only things you should do on a core-file: use only these
1149 * functions to write out all the necessary info.
1150 */
1151static int dump_write(struct file *file, const void *addr, int nr)
1152{
1153 return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
1154}
1155
1156static int dump_seek(struct file *file, loff_t off)
1157{
1158 if (file->f_op->llseek) {
1159 if (file->f_op->llseek(file, off, SEEK_SET) != off)
1160 return 0;
1161 } else {
1162 file->f_pos = off;
1163 }
1164 return 1;
1165}
1166
1167/*
1168 * Decide whether a segment is worth dumping; default is yes to be
1169 * sure (missing info is worse than too much; etc).
1170 * Personally I'd include everything, and use the coredump limit...
1171 *
1172 * I think we should skip something. But I am not sure how. H.J.
1173 */
1174static int maydump(struct vm_area_struct *vma)
1175{
1176 /* Do not dump I/O mapped devices or special mappings */
1177 if (vma->vm_flags & (VM_IO | VM_RESERVED)) {
1178 kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags);
1179 return 0;
1180 }
1181
1182 /* If we may not read the contents, don't allow us to dump
1183 * them either. "dump_write()" can't handle it anyway.
1184 */
1185 if (!(vma->vm_flags & VM_READ)) {
1186 kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags);
1187 return 0;
1188 }
1189
1190 /* Dump shared memory only if mapped from an anonymous file. */
1191 if (vma->vm_flags & VM_SHARED) {
1192 if (vma->vm_file->f_dentry->d_inode->i_nlink == 0) {
1193 kdcore("%08lx: %08lx: no (share)", vma->vm_start, vma->vm_flags);
1194 return 1;
1195 }
1196
1197 kdcore("%08lx: %08lx: no (share)", vma->vm_start, vma->vm_flags);
1198 return 0;
1199 }
1200
1201#ifdef CONFIG_MMU
1202 /* If it hasn't been written to, don't write it out */
1203 if (!vma->anon_vma) {
1204 kdcore("%08lx: %08lx: no (!anon)", vma->vm_start, vma->vm_flags);
1205 return 0;
1206 }
1207#endif
1208
1209 kdcore("%08lx: %08lx: yes", vma->vm_start, vma->vm_flags);
1210 return 1;
1211}
1212
1213/* An ELF note in memory */
1214struct memelfnote
1215{
1216 const char *name;
1217 int type;
1218 unsigned int datasz;
1219 void *data;
1220};
1221
1222static int notesize(struct memelfnote *en)
1223{
1224 int sz;
1225
1226 sz = sizeof(struct elf_note);
1227 sz += roundup(strlen(en->name) + 1, 4);
1228 sz += roundup(en->datasz, 4);
1229
1230 return sz;
1231}
1232
1233/* #define DEBUG */
1234
1235#define DUMP_WRITE(addr, nr) \
1236 do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
1237#define DUMP_SEEK(off) \
1238 do { if (!dump_seek(file, (off))) return 0; } while(0)
1239
1240static int writenote(struct memelfnote *men, struct file *file)
1241{
1242 struct elf_note en;
1243
1244 en.n_namesz = strlen(men->name) + 1;
1245 en.n_descsz = men->datasz;
1246 en.n_type = men->type;
1247
1248 DUMP_WRITE(&en, sizeof(en));
1249 DUMP_WRITE(men->name, en.n_namesz);
1250 /* XXX - cast from long long to long to avoid need for libgcc.a */
1251 DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */
1252 DUMP_WRITE(men->data, men->datasz);
1253 DUMP_SEEK(roundup((unsigned long)file->f_pos, 4)); /* XXX */
1254
1255 return 1;
1256}
1257#undef DUMP_WRITE
1258#undef DUMP_SEEK
1259
1260#define DUMP_WRITE(addr, nr) \
1261 if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
1262 goto end_coredump;
1263#define DUMP_SEEK(off) \
1264 if (!dump_seek(file, (off))) \
1265 goto end_coredump;
1266
1267static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
1268{
1269 memcpy(elf->e_ident, ELFMAG, SELFMAG);
1270 elf->e_ident[EI_CLASS] = ELF_CLASS;
1271 elf->e_ident[EI_DATA] = ELF_DATA;
1272 elf->e_ident[EI_VERSION] = EV_CURRENT;
1273 elf->e_ident[EI_OSABI] = ELF_OSABI;
1274 memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
1275
1276 elf->e_type = ET_CORE;
1277 elf->e_machine = ELF_ARCH;
1278 elf->e_version = EV_CURRENT;
1279 elf->e_entry = 0;
1280 elf->e_phoff = sizeof(struct elfhdr);
1281 elf->e_shoff = 0;
1282 elf->e_flags = ELF_FDPIC_CORE_EFLAGS;
1283 elf->e_ehsize = sizeof(struct elfhdr);
1284 elf->e_phentsize = sizeof(struct elf_phdr);
1285 elf->e_phnum = segs;
1286 elf->e_shentsize = 0;
1287 elf->e_shnum = 0;
1288 elf->e_shstrndx = 0;
1289 return;
1290}
1291
1292static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1293{
1294 phdr->p_type = PT_NOTE;
1295 phdr->p_offset = offset;
1296 phdr->p_vaddr = 0;
1297 phdr->p_paddr = 0;
1298 phdr->p_filesz = sz;
1299 phdr->p_memsz = 0;
1300 phdr->p_flags = 0;
1301 phdr->p_align = 0;
1302 return;
1303}
1304
1305static inline void fill_note(struct memelfnote *note, const char *name, int type,
1306 unsigned int sz, void *data)
1307{
1308 note->name = name;
1309 note->type = type;
1310 note->datasz = sz;
1311 note->data = data;
1312 return;
1313}
1314
1315/*
1316 * fill up all the fields in prstatus from the given task struct, except
1317 * registers which need to be filled up seperately.
1318 */
1319static void fill_prstatus(struct elf_prstatus *prstatus,
1320 struct task_struct *p, long signr)
1321{
1322 prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1323 prstatus->pr_sigpend = p->pending.signal.sig[0];
1324 prstatus->pr_sighold = p->blocked.sig[0];
1325 prstatus->pr_pid = p->pid;
1326 prstatus->pr_ppid = p->parent->pid;
1327 prstatus->pr_pgrp = process_group(p);
1328 prstatus->pr_sid = p->signal->session;
1329 if (thread_group_leader(p)) {
1330 /*
1331 * This is the record for the group leader. Add in the
1332 * cumulative times of previous dead threads. This total
1333 * won't include the time of each live thread whose state
1334 * is included in the core dump. The final total reported
1335 * to our parent process when it calls wait4 will include
1336 * those sums as well as the little bit more time it takes
1337 * this and each other thread to finish dying after the
1338 * core dump synchronization phase.
1339 */
1340 cputime_to_timeval(cputime_add(p->utime, p->signal->utime),
1341 &prstatus->pr_utime);
1342 cputime_to_timeval(cputime_add(p->stime, p->signal->stime),
1343 &prstatus->pr_stime);
1344 } else {
1345 cputime_to_timeval(p->utime, &prstatus->pr_utime);
1346 cputime_to_timeval(p->stime, &prstatus->pr_stime);
1347 }
1348 cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1349 cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1350
1351 prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap;
1352 prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap;
1353}
1354
1355static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1356 struct mm_struct *mm)
1357{
1358 unsigned int i, len;
1359
1360 /* first copy the parameters from user space */
1361 memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1362
1363 len = mm->arg_end - mm->arg_start;
1364 if (len >= ELF_PRARGSZ)
1365 len = ELF_PRARGSZ - 1;
1366 if (copy_from_user(&psinfo->pr_psargs,
1367 (const char __user *) mm->arg_start, len))
1368 return -EFAULT;
1369 for (i = 0; i < len; i++)
1370 if (psinfo->pr_psargs[i] == 0)
1371 psinfo->pr_psargs[i] = ' ';
1372 psinfo->pr_psargs[len] = 0;
1373
1374 psinfo->pr_pid = p->pid;
1375 psinfo->pr_ppid = p->parent->pid;
1376 psinfo->pr_pgrp = process_group(p);
1377 psinfo->pr_sid = p->signal->session;
1378
1379 i = p->state ? ffz(~p->state) + 1 : 0;
1380 psinfo->pr_state = i;
1381 psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1382 psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1383 psinfo->pr_nice = task_nice(p);
1384 psinfo->pr_flag = p->flags;
1385 SET_UID(psinfo->pr_uid, p->uid);
1386 SET_GID(psinfo->pr_gid, p->gid);
1387 strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1388
1389 return 0;
1390}
1391
1392/* Here is the structure in which status of each thread is captured. */
1393struct elf_thread_status
1394{
1395 struct list_head list;
1396 struct elf_prstatus prstatus; /* NT_PRSTATUS */
1397 elf_fpregset_t fpu; /* NT_PRFPREG */
1398 struct task_struct *thread;
1399#ifdef ELF_CORE_COPY_XFPREGS
1400 elf_fpxregset_t xfpu; /* NT_PRXFPREG */
1401#endif
1402 struct memelfnote notes[3];
1403 int num_notes;
1404};
1405
1406/*
1407 * In order to add the specific thread information for the elf file format,
1408 * we need to keep a linked list of every thread's pr_status and then create
1409 * a single section for them in the final core file.
1410 */
1411static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1412{
1413 struct task_struct *p = t->thread;
1414 int sz = 0;
1415
1416 t->num_notes = 0;
1417
1418 fill_prstatus(&t->prstatus, p, signr);
1419 elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1420
1421 fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1422 &t->prstatus);
1423 t->num_notes++;
1424 sz += notesize(&t->notes[0]);
1425
1426 t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu);
1427 if (t->prstatus.pr_fpvalid) {
1428 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1429 &t->fpu);
1430 t->num_notes++;
1431 sz += notesize(&t->notes[1]);
1432 }
1433
1434#ifdef ELF_CORE_COPY_XFPREGS
1435 if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1436 fill_note(&t->notes[2], "LINUX", NT_PRXFPREG, sizeof(t->xfpu),
1437 &t->xfpu);
1438 t->num_notes++;
1439 sz += notesize(&t->notes[2]);
1440 }
1441#endif
1442 return sz;
1443}
1444
1445/*
1446 * dump the segments for an MMU process
1447 */
1448#ifdef CONFIG_MMU
1449static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm,
1450 size_t *size, unsigned long *limit)
1451{
1452 struct vm_area_struct *vma;
1453
1454 for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1455 unsigned long addr;
1456
1457 if (!maydump(vma))
1458 continue;
1459
1460 for (addr = vma->vm_start;
1461 addr < vma->vm_end;
1462 addr += PAGE_SIZE
1463 ) {
1464 struct vm_area_struct *vma;
1465 struct page *page;
1466
1467 if (get_user_pages(current, current->mm, addr, 1, 0, 1,
1468 &page, &vma) <= 0) {
1469 DUMP_SEEK(file->f_pos + PAGE_SIZE);
1470 }
1471 else if (page == ZERO_PAGE(addr)) {
1472 DUMP_SEEK(file->f_pos + PAGE_SIZE);
1473 page_cache_release(page);
1474 }
1475 else {
1476 void *kaddr;
1477
1478 flush_cache_page(vma, addr, page_to_pfn(page));
1479 kaddr = kmap(page);
1480 if ((*size += PAGE_SIZE) > *limit ||
1481 !dump_write(file, kaddr, PAGE_SIZE)
1482 ) {
1483 kunmap(page);
1484 page_cache_release(page);
1485 return -EIO;
1486 }
1487 kunmap(page);
1488 page_cache_release(page);
1489 }
1490 }
1491 }
1492
1493 return 0;
1494
1495end_coredump:
1496 return -EFBIG;
1497}
1498#endif
1499
1500/*
1501 * dump the segments for a NOMMU process
1502 */
1503#ifndef CONFIG_MMU
1504static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm,
1505 size_t *size, unsigned long *limit)
1506{
1507 struct vm_list_struct *vml;
1508
1509 for (vml = current->mm->context.vmlist; vml; vml = vml->next) {
1510 struct vm_area_struct *vma = vml->vma;
1511
1512 if (!maydump(vma))
1513 continue;
1514
1515 if ((*size += PAGE_SIZE) > *limit)
1516 return -EFBIG;
1517
1518 if (!dump_write(file, (void *) vma->vm_start,
1519 vma->vm_end - vma->vm_start))
1520 return -EIO;
1521 }
1522
1523 return 0;
1524}
1525#endif
1526
1527/*
1528 * Actual dumper
1529 *
1530 * This is a two-pass process; first we find the offsets of the bits,
1531 * and then they are actually written out. If we run out of core limit
1532 * we just truncate.
1533 */
1534static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
1535 struct file *file)
1536{
1537#define NUM_NOTES 6
1538 int has_dumped = 0;
1539 mm_segment_t fs;
1540 int segs;
1541 size_t size = 0;
1542 int i;
1543 struct vm_area_struct *vma;
1544 struct elfhdr *elf = NULL;
1545 loff_t offset = 0, dataoff;
1546 unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
1547 int numnote;
1548 struct memelfnote *notes = NULL;
1549 struct elf_prstatus *prstatus = NULL; /* NT_PRSTATUS */
1550 struct elf_prpsinfo *psinfo = NULL; /* NT_PRPSINFO */
1551 struct task_struct *g, *p;
1552 LIST_HEAD(thread_list);
1553 struct list_head *t;
1554 elf_fpregset_t *fpu = NULL;
1555#ifdef ELF_CORE_COPY_XFPREGS
1556 elf_fpxregset_t *xfpu = NULL;
1557#endif
1558 int thread_status_size = 0;
1559#ifndef CONFIG_MMU
1560 struct vm_list_struct *vml;
1561#endif
1562 elf_addr_t *auxv;
1563
1564 /*
1565 * We no longer stop all VM operations.
1566 *
1567 * This is because those proceses that could possibly change map_count
1568 * or the mmap / vma pages are now blocked in do_exit on current
1569 * finishing this core dump.
1570 *
1571 * Only ptrace can touch these memory addresses, but it doesn't change
1572 * the map_count or the pages allocated. So no possibility of crashing
1573 * exists while dumping the mm->vm_next areas to the core file.
1574 */
1575
1576 /* alloc memory for large data structures: too large to be on stack */
1577 elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1578 if (!elf)
1579 goto cleanup;
1580 prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL);
1581 if (!prstatus)
1582 goto cleanup;
1583 psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1584 if (!psinfo)
1585 goto cleanup;
1586 notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
1587 if (!notes)
1588 goto cleanup;
1589 fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
1590 if (!fpu)
1591 goto cleanup;
1592#ifdef ELF_CORE_COPY_XFPREGS
1593 xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
1594 if (!xfpu)
1595 goto cleanup;
1596#endif
1597
1598 if (signr) {
1599 struct elf_thread_status *tmp;
1600 read_lock(&tasklist_lock);
1601 do_each_thread(g,p)
1602 if (current->mm == p->mm && current != p) {
1603 tmp = kzalloc(sizeof(*tmp), GFP_ATOMIC);
1604 if (!tmp) {
1605 read_unlock(&tasklist_lock);
1606 goto cleanup;
1607 }
1608 INIT_LIST_HEAD(&tmp->list);
1609 tmp->thread = p;
1610 list_add(&tmp->list, &thread_list);
1611 }
1612 while_each_thread(g,p);
1613 read_unlock(&tasklist_lock);
1614 list_for_each(t, &thread_list) {
1615 struct elf_thread_status *tmp;
1616 int sz;
1617
1618 tmp = list_entry(t, struct elf_thread_status, list);
1619 sz = elf_dump_thread_status(signr, tmp);
1620 thread_status_size += sz;
1621 }
1622 }
1623
1624 /* now collect the dump for the current */
1625 fill_prstatus(prstatus, current, signr);
1626 elf_core_copy_regs(&prstatus->pr_reg, regs);
1627
1628#ifdef CONFIG_MMU
1629 segs = current->mm->map_count;
1630#else
1631 segs = 0;
1632 for (vml = current->mm->context.vmlist; vml; vml = vml->next)
1633 segs++;
1634#endif
1635#ifdef ELF_CORE_EXTRA_PHDRS
1636 segs += ELF_CORE_EXTRA_PHDRS;
1637#endif
1638
1639 /* Set up header */
1640 fill_elf_fdpic_header(elf, segs + 1); /* including notes section */
1641
1642 has_dumped = 1;
1643 current->flags |= PF_DUMPCORE;
1644
1645 /*
1646 * Set up the notes in similar form to SVR4 core dumps made
1647 * with info from their /proc.
1648 */
1649
1650 fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
1651 fill_psinfo(psinfo, current->group_leader, current->mm);
1652 fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1653
1654 numnote = 2;
1655
1656 auxv = (elf_addr_t *) current->mm->saved_auxv;
1657
1658 i = 0;
1659 do
1660 i += 2;
1661 while (auxv[i - 2] != AT_NULL);
1662 fill_note(&notes[numnote++], "CORE", NT_AUXV,
1663 i * sizeof(elf_addr_t), auxv);
1664
1665 /* Try to dump the FPU. */
1666 if ((prstatus->pr_fpvalid =
1667 elf_core_copy_task_fpregs(current, regs, fpu)))
1668 fill_note(notes + numnote++,
1669 "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
1670#ifdef ELF_CORE_COPY_XFPREGS
1671 if (elf_core_copy_task_xfpregs(current, xfpu))
1672 fill_note(notes + numnote++,
1673 "LINUX", NT_PRXFPREG, sizeof(*xfpu), xfpu);
1674#endif
1675
1676 fs = get_fs();
1677 set_fs(KERNEL_DS);
1678
1679 DUMP_WRITE(elf, sizeof(*elf));
1680 offset += sizeof(*elf); /* Elf header */
1681 offset += (segs+1) * sizeof(struct elf_phdr); /* Program headers */
1682
1683 /* Write notes phdr entry */
1684 {
1685 struct elf_phdr phdr;
1686 int sz = 0;
1687
1688 for (i = 0; i < numnote; i++)
1689 sz += notesize(notes + i);
1690
1691 sz += thread_status_size;
1692
1693 fill_elf_note_phdr(&phdr, sz, offset);
1694 offset += sz;
1695 DUMP_WRITE(&phdr, sizeof(phdr));
1696 }
1697
1698 /* Page-align dumped data */
1699 dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1700
1701 /* write program headers for segments dump */
1702 for (
1703#ifdef CONFIG_MMU
1704 vma = current->mm->mmap; vma; vma = vma->vm_next
1705#else
1706 vml = current->mm->context.vmlist; vml; vml = vml->next
1707#endif
1708 ) {
1709 struct elf_phdr phdr;
1710 size_t sz;
1711
1712#ifndef CONFIG_MMU
1713 vma = vml->vma;
1714#endif
1715
1716 sz = vma->vm_end - vma->vm_start;
1717
1718 phdr.p_type = PT_LOAD;
1719 phdr.p_offset = offset;
1720 phdr.p_vaddr = vma->vm_start;
1721 phdr.p_paddr = 0;
1722 phdr.p_filesz = maydump(vma) ? sz : 0;
1723 phdr.p_memsz = sz;
1724 offset += phdr.p_filesz;
1725 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
1726 if (vma->vm_flags & VM_WRITE)
1727 phdr.p_flags |= PF_W;
1728 if (vma->vm_flags & VM_EXEC)
1729 phdr.p_flags |= PF_X;
1730 phdr.p_align = ELF_EXEC_PAGESIZE;
1731
1732 DUMP_WRITE(&phdr, sizeof(phdr));
1733 }
1734
1735#ifdef ELF_CORE_WRITE_EXTRA_PHDRS
1736 ELF_CORE_WRITE_EXTRA_PHDRS;
1737#endif
1738
1739 /* write out the notes section */
1740 for (i = 0; i < numnote; i++)
1741 if (!writenote(notes + i, file))
1742 goto end_coredump;
1743
1744 /* write out the thread status notes section */
1745 list_for_each(t, &thread_list) {
1746 struct elf_thread_status *tmp =
1747 list_entry(t, struct elf_thread_status, list);
1748
1749 for (i = 0; i < tmp->num_notes; i++)
1750 if (!writenote(&tmp->notes[i], file))
1751 goto end_coredump;
1752 }
1753
1754 DUMP_SEEK(dataoff);
1755
1756 if (elf_fdpic_dump_segments(file, current->mm, &size, &limit) < 0)
1757 goto end_coredump;
1758
1759#ifdef ELF_CORE_WRITE_EXTRA_DATA
1760 ELF_CORE_WRITE_EXTRA_DATA;
1761#endif
1762
1763 if (file->f_pos != offset) {
1764 /* Sanity check */
1765 printk(KERN_WARNING
1766 "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
1767 file->f_pos, offset);
1768 }
1769
1770end_coredump:
1771 set_fs(fs);
1772
1773cleanup:
1774 while (!list_empty(&thread_list)) {
1775 struct list_head *tmp = thread_list.next;
1776 list_del(tmp);
1777 kfree(list_entry(tmp, struct elf_thread_status, list));
1778 }
1779
1780 kfree(elf);
1781 kfree(prstatus);
1782 kfree(psinfo);
1783 kfree(notes);
1784 kfree(fpu);
1785#ifdef ELF_CORE_COPY_XFPREGS
1786 kfree(xfpu);
1787#endif
1788 return has_dumped;
1789#undef NUM_NOTES
1790}
1791
1792#endif /* USE_ELF_CORE_DUMP */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-23 15:10:14 -0500