fs/binfmt_elf_fdpic.c

   1 /* binfmt_elf_fdpic.c: FDPIC ELF binary format
   2  *
   3  * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  * Derived from binfmt_elf.c
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12
  13 #include <linux/module.h>
  14
  15 #include <linux/fs.h>
  16 #include <linux/stat.h>
  17 #include <linux/sched.h>
  18 #include <linux/mm.h>
  19 #include <linux/mman.h>
  20 #include <linux/errno.h>
  21 #include <linux/signal.h>
  22 #include <linux/binfmts.h>
  23 #include <linux/string.h>
  24 #include <linux/file.h>
  25 #include <linux/fcntl.h>
  26 #include <linux/slab.h>
  27 #include <linux/pagemap.h>
  28 #include <linux/security.h>
  29 #include <linux/highmem.h>
  30 #include <linux/highuid.h>
  31 #include <linux/personality.h>
  32 #include <linux/ptrace.h>
  33 #include <linux/init.h>
  34 #include <linux/elf.h>
  35 #include <linux/elf-fdpic.h>
  36 #include <linux/elfcore.h>
  37 #include <linux/coredump.h>
  38
  39 #include <asm/uaccess.h>
  40 #include <asm/param.h>
  41 #include <asm/pgalloc.h>
  42
  43 typedef char *elf_caddr_t;
  44
  45 #if 0
  46 #define kdebug(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
  47 #else
  48 #define kdebug(fmt, ...) do {} while(0)
  49 #endif
  50
  51 #if 0
  52 #define kdcore(fmt, ...) printk("FDPIC "fmt"\n" ,##__VA_ARGS__ )
  53 #else
  54 #define kdcore(fmt, ...) do {} while(0)
  55 #endif
  56
  57 MODULE_LICENSE("GPL");
  58
  59 static int load_elf_fdpic_binary(struct linux_binprm *, struct pt_regs *);
  60 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *, struct file *);
  61 static int elf_fdpic_map_file(struct elf_fdpic_params *, struct file *,
  62                               struct mm_struct *, const char *);
  63
  64 static int create_elf_fdpic_tables(struct linux_binprm *, struct mm_struct *,
  65                                    struct elf_fdpic_params *,
  66                                    struct elf_fdpic_params *);
  67
  68 #ifndef CONFIG_MMU
  69 static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *,
  70                                             unsigned long *);
  71 static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *,
  72                                                    struct file *,
  73                                                    struct mm_struct *);
  74 #endif
  75
  76 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
  77                                              struct file *, struct mm_struct *);
  78
  79 #ifdef CONFIG_ELF_CORE
  80 static int elf_fdpic_core_dump(struct coredump_params *cprm);
  81 #endif
  82
  83 static struct linux_binfmt elf_fdpic_format = {
  84         .module         = THIS_MODULE,
  85         .load_binary    = load_elf_fdpic_binary,
  86 #ifdef CONFIG_ELF_CORE
  87         .core_dump      = elf_fdpic_core_dump,
  88 #endif
  89         .min_coredump   = ELF_EXEC_PAGESIZE,
  90 };
  91
  92 static int __init init_elf_fdpic_binfmt(void)
  93 {
  94         return register_binfmt(&elf_fdpic_format);
  95 }
  96
  97 static void __exit exit_elf_fdpic_binfmt(void)
  98 {
  99         unregister_binfmt(&elf_fdpic_format);
 100 }
 101
 102 core_initcall(init_elf_fdpic_binfmt);
 103 module_exit(exit_elf_fdpic_binfmt);
 104
 105 static int is_elf_fdpic(struct elfhdr *hdr, struct file *file)
 106 {
 107         if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0)
 108                 return 0;
 109         if (hdr->e_type != ET_EXEC && hdr->e_type != ET_DYN)
 110                 return 0;
 111         if (!elf_check_arch(hdr) || !elf_check_fdpic(hdr))
 112                 return 0;
 113         if (!file->f_op || !file->f_op->mmap)
 114                 return 0;
 115         return 1;
 116 }
 117
 118 /*****************************************************************************/
 119 /*
 120  * read the program headers table into memory
 121  */
 122 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,
 123                                  struct file *file)
 124 {
 125         struct elf32_phdr *phdr;
 126         unsigned long size;
 127         int retval, loop;
 128
 129         if (params->hdr.e_phentsize != sizeof(struct elf_phdr))
 130                 return -ENOMEM;
 131         if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr))
 132                 return -ENOMEM;
 133
 134         size = params->hdr.e_phnum * sizeof(struct elf_phdr);
 135         params->phdrs = kmalloc(size, GFP_KERNEL);
 136         if (!params->phdrs)
 137                 return -ENOMEM;
 138
 139         retval = kernel_read(file, params->hdr.e_phoff,
 140                              (char *) params->phdrs, size);
 141         if (unlikely(retval != size))
 142                 return retval < 0 ? retval : -ENOEXEC;
 143
 144         /* determine stack size for this binary */
 145         phdr = params->phdrs;
 146         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 147                 if (phdr->p_type != PT_GNU_STACK)
 148                         continue;
 149
 150                 if (phdr->p_flags & PF_X)
 151                         params->flags |= ELF_FDPIC_FLAG_EXEC_STACK;
 152                 else
 153                         params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK;
 154
 155                 params->stack_size = phdr->p_memsz;
 156                 break;
 157         }
 158
 159         return 0;
 160 }
 161
 162 /*****************************************************************************/
 163 /*
 164  * load an fdpic binary into various bits of memory
 165  */
 166 static int load_elf_fdpic_binary(struct linux_binprm *bprm,
 167                                  struct pt_regs *regs)
 168 {
 169         struct elf_fdpic_params exec_params, interp_params;
 170         struct elf_phdr *phdr;
 171         unsigned long stack_size, entryaddr;
 172 #ifdef ELF_FDPIC_PLAT_INIT
 173         unsigned long dynaddr;
 174 #endif
 175 #ifndef CONFIG_MMU
 176         unsigned long stack_prot;
 177 #endif
 178         struct file *interpreter = NULL; /* to shut gcc up */
 179         char *interpreter_name = NULL;
 180         int executable_stack;
 181         int retval, i;
 182
 183         kdebug("____ LOAD %d ____", current->pid);
 184
 185         memset(&exec_params, 0, sizeof(exec_params));
 186         memset(&interp_params, 0, sizeof(interp_params));
 187
 188         exec_params.hdr = *(struct elfhdr *) bprm->buf;
 189         exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE;
 190
 191         /* check that this is a binary we know how to deal with */
 192         retval = -ENOEXEC;
 193         if (!is_elf_fdpic(&exec_params.hdr, bprm->file))
 194                 goto error;
 195
 196         /* read the program header table */
 197         retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file);
 198         if (retval < 0)
 199                 goto error;
 200
 201         /* scan for a program header that specifies an interpreter */
 202         phdr = exec_params.phdrs;
 203
 204         for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) {
 205                 switch (phdr->p_type) {
 206                 case PT_INTERP:
 207                         retval = -ENOMEM;
 208                         if (phdr->p_filesz > PATH_MAX)
 209                                 goto error;
 210                         retval = -ENOENT;
 211                         if (phdr->p_filesz < 2)
 212                                 goto error;
 213
 214                         /* read the name of the interpreter into memory */
 215                         interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL);
 216                         if (!interpreter_name)
 217                                 goto error;
 218
 219                         retval = kernel_read(bprm->file,
 220                                              phdr->p_offset,
 221                                              interpreter_name,
 222                                              phdr->p_filesz);
 223                         if (unlikely(retval != phdr->p_filesz)) {
 224                                 if (retval >= 0)
 225                                         retval = -ENOEXEC;
 226                                 goto error;
 227                         }
 228
 229                         retval = -ENOENT;
 230                         if (interpreter_name[phdr->p_filesz - 1] != '\0')
 231                                 goto error;
 232
 233                         kdebug("Using ELF interpreter %s", interpreter_name);
 234
 235                         /* replace the program with the interpreter */
 236                         interpreter = open_exec(interpreter_name);
 237                         retval = PTR_ERR(interpreter);
 238                         if (IS_ERR(interpreter)) {
 239                                 interpreter = NULL;
 240                                 goto error;
 241                         }
 242
 243                         /*
 244                          * If the binary is not readable then enforce
 245                          * mm->dumpable = 0 regardless of the interpreter's
 246                          * permissions.
 247                          */
 248                         if (file_permission(interpreter, MAY_READ) < 0)
 249                                 bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP;
 250
 251                         retval = kernel_read(interpreter, 0, bprm->buf,
 252                                              BINPRM_BUF_SIZE);
 253                         if (unlikely(retval != BINPRM_BUF_SIZE)) {
 254                                 if (retval >= 0)
 255                                         retval = -ENOEXEC;
 256                                 goto error;
 257                         }
 258
 259                         interp_params.hdr = *((struct elfhdr *) bprm->buf);
 260                         break;
 261
 262                 case PT_LOAD:
 263 #ifdef CONFIG_MMU
 264                         if (exec_params.load_addr == 0)
 265                                 exec_params.load_addr = phdr->p_vaddr;
 266 #endif
 267                         break;
 268                 }
 269
 270         }
 271
 272         if (elf_check_const_displacement(&exec_params.hdr))
 273                 exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
 274
 275         /* perform insanity checks on the interpreter */
 276         if (interpreter_name) {
 277                 retval = -ELIBBAD;
 278                 if (!is_elf_fdpic(&interp_params.hdr, interpreter))
 279                         goto error;
 280
 281                 interp_params.flags = ELF_FDPIC_FLAG_PRESENT;
 282
 283                 /* read the interpreter's program header table */
 284                 retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter);
 285                 if (retval < 0)
 286                         goto error;
 287         }
 288
 289         stack_size = exec_params.stack_size;
 290         if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
 291                 executable_stack = EXSTACK_ENABLE_X;
 292         else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
 293                 executable_stack = EXSTACK_DISABLE_X;
 294         else
 295                 executable_stack = EXSTACK_DEFAULT;
 296
 297         if (stack_size == 0) {
 298                 stack_size = interp_params.stack_size;
 299                 if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
 300                         executable_stack = EXSTACK_ENABLE_X;
 301                 else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
 302                         executable_stack = EXSTACK_DISABLE_X;
 303                 else
 304                         executable_stack = EXSTACK_DEFAULT;
 305         }
 306
 307         retval = -ENOEXEC;
 308         if (stack_size == 0)
 309                 goto error;
 310
 311         if (elf_check_const_displacement(&interp_params.hdr))
 312                 interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
 313
 314         /* flush all traces of the currently running executable */
 315         retval = flush_old_exec(bprm);
 316         if (retval)
 317                 goto error;
 318
 319         /* there's now no turning back... the old userspace image is dead,
 320          * defunct, deceased, etc. after this point we have to exit via
 321          * error_kill */
 322         set_personality(PER_LINUX_FDPIC);
 323         if (elf_read_implies_exec(&exec_params.hdr, executable_stack))
 324                 current->personality |= READ_IMPLIES_EXEC;
 325
 326         setup_new_exec(bprm);
 327
 328         set_binfmt(&elf_fdpic_format);
 329
 330         current->mm->start_code = 0;
 331         current->mm->end_code = 0;
 332         current->mm->start_stack = 0;
 333         current->mm->start_data = 0;
 334         current->mm->end_data = 0;
 335         current->mm->context.exec_fdpic_loadmap = 0;
 336         current->mm->context.interp_fdpic_loadmap = 0;
 337
 338         current->flags &= ~PF_FORKNOEXEC;
 339
 340 #ifdef CONFIG_MMU
 341         elf_fdpic_arch_lay_out_mm(&exec_params,
 342                                   &interp_params,
 343                                   &current->mm->start_stack,
 344                                   &current->mm->start_brk);
 345
 346         retval = setup_arg_pages(bprm, current->mm->start_stack,
 347                                  executable_stack);
 348         if (retval < 0) {
 349                 send_sig(SIGKILL, current, 0);
 350                 goto error_kill;
 351         }
 352 #endif
 353
 354         /* load the executable and interpreter into memory */
 355         retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm,
 356                                     "executable");
 357         if (retval < 0)
 358                 goto error_kill;
 359
 360         if (interpreter_name) {
 361                 retval = elf_fdpic_map_file(&interp_params, interpreter,
 362                                             current->mm, "interpreter");
 363                 if (retval < 0) {
 364                         printk(KERN_ERR "Unable to load interpreter\n");
 365                         goto error_kill;
 366                 }
 367
 368                 allow_write_access(interpreter);
 369                 fput(interpreter);
 370                 interpreter = NULL;
 371         }
 372
 373 #ifdef CONFIG_MMU
 374         if (!current->mm->start_brk)
 375                 current->mm->start_brk = current->mm->end_data;
 376
 377         current->mm->brk = current->mm->start_brk =
 378                 PAGE_ALIGN(current->mm->start_brk);
 379
 380 #else
 381         /* create a stack and brk area big enough for everyone
 382          * - the brk heap starts at the bottom and works up
 383          * - the stack starts at the top and works down
 384          */
 385         stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK;
 386         if (stack_size < PAGE_SIZE * 2)
 387                 stack_size = PAGE_SIZE * 2;
 388
 389         stack_prot = PROT_READ | PROT_WRITE;
 390         if (executable_stack == EXSTACK_ENABLE_X ||
 391             (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC))
 392                 stack_prot |= PROT_EXEC;
 393
 394         down_write(&current->mm->mmap_sem);
 395         current->mm->start_brk = do_mmap(NULL, 0, stack_size, stack_prot,
 396                                          MAP_PRIVATE | MAP_ANONYMOUS |
 397                                          MAP_UNINITIALIZED | MAP_GROWSDOWN,
 398                                          0);
 399
 400         if (IS_ERR_VALUE(current->mm->start_brk)) {
 401                 up_write(&current->mm->mmap_sem);
 402                 retval = current->mm->start_brk;
 403                 current->mm->start_brk = 0;
 404                 goto error_kill;
 405         }
 406
 407         up_write(&current->mm->mmap_sem);
 408
 409         current->mm->brk = current->mm->start_brk;
 410         current->mm->context.end_brk = current->mm->start_brk;
 411         current->mm->context.end_brk +=
 412                 (stack_size > PAGE_SIZE) ? (stack_size - PAGE_SIZE) : 0;
 413         current->mm->start_stack = current->mm->start_brk + stack_size;
 414 #endif
 415
 416         install_exec_creds(bprm);
 417         current->flags &= ~PF_FORKNOEXEC;
 418         if (create_elf_fdpic_tables(bprm, current->mm,
 419                                     &exec_params, &interp_params) < 0)
 420                 goto error_kill;
 421
 422         kdebug("- start_code  %lx", current->mm->start_code);
 423         kdebug("- end_code    %lx", current->mm->end_code);
 424         kdebug("- start_data  %lx", current->mm->start_data);
 425         kdebug("- end_data    %lx", current->mm->end_data);
 426         kdebug("- start_brk   %lx", current->mm->start_brk);
 427         kdebug("- brk         %lx", current->mm->brk);
 428         kdebug("- start_stack %lx", current->mm->start_stack);
 429
 430 #ifdef ELF_FDPIC_PLAT_INIT
 431         /*
 432          * The ABI may specify that certain registers be set up in special
 433          * ways (on i386 %edx is the address of a DT_FINI function, for
 434          * example.  This macro performs whatever initialization to
 435          * the regs structure is required.
 436          */
 437         dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr;
 438         ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr,
 439                             dynaddr);
 440 #endif
 441
 442         /* everything is now ready... get the userspace context ready to roll */
 443         entryaddr = interp_params.entry_addr ?: exec_params.entry_addr;
 444         start_thread(regs, entryaddr, current->mm->start_stack);
 445
 446         retval = 0;
 447
 448 error:
 449         if (interpreter) {
 450                 allow_write_access(interpreter);
 451                 fput(interpreter);
 452         }
 453         kfree(interpreter_name);
 454         kfree(exec_params.phdrs);
 455         kfree(exec_params.loadmap);
 456         kfree(interp_params.phdrs);
 457         kfree(interp_params.loadmap);
 458         return retval;
 459
 460         /* unrecoverable error - kill the process */
 461 error_kill:
 462         send_sig(SIGSEGV, current, 0);
 463         goto error;
 464
 465 }
 466
 467 /*****************************************************************************/
 468
 469 #ifndef ELF_BASE_PLATFORM
 470 /*
 471  * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
 472  * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
 473  * will be copied to the user stack in the same manner as AT_PLATFORM.
 474  */
 475 #define ELF_BASE_PLATFORM NULL
 476 #endif
 477
 478 /*
 479  * present useful information to the program by shovelling it onto the new
 480  * process's stack
 481  */
 482 static int create_elf_fdpic_tables(struct linux_binprm *bprm,
 483                                    struct mm_struct *mm,
 484                                    struct elf_fdpic_params *exec_params,
 485                                    struct elf_fdpic_params *interp_params)
 486 {
 487         const struct cred *cred = current_cred();
 488         unsigned long sp, csp, nitems;
 489         elf_caddr_t __user *argv, *envp;
 490         size_t platform_len = 0, len;
 491         char *k_platform, *k_base_platform;
 492         char __user *u_platform, *u_base_platform, *p;
 493         long hwcap;
 494         int loop;
 495         int nr; /* reset for each csp adjustment */
 496
 497 #ifdef CONFIG_MMU
 498         /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions
 499          * by the processes running on the same package. One thing we can do is
 500          * to shuffle the initial stack for them, so we give the architecture
 501          * an opportunity to do so here.
 502          */
 503         sp = arch_align_stack(bprm->p);
 504 #else
 505         sp = mm->start_stack;
 506
 507         /* stack the program arguments and environment */
 508         if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0)
 509                 return -EFAULT;
 510 #endif
 511
 512         hwcap = ELF_HWCAP;
 513
 514         /*
 515          * If this architecture has a platform capability string, copy it
 516          * to userspace.  In some cases (Sparc), this info is impossible
 517          * for userspace to get any other way, in others (i386) it is
 518          * merely difficult.
 519          */
 520         k_platform = ELF_PLATFORM;
 521         u_platform = NULL;
 522
 523         if (k_platform) {
 524                 platform_len = strlen(k_platform) + 1;
 525                 sp -= platform_len;
 526                 u_platform = (char __user *) sp;
 527                 if (__copy_to_user(u_platform, k_platform, platform_len) != 0)
 528                         return -EFAULT;
 529         }
 530
 531         /*
 532          * If this architecture has a "base" platform capability
 533          * string, copy it to userspace.
 534          */
 535         k_base_platform = ELF_BASE_PLATFORM;
 536         u_base_platform = NULL;
 537
 538         if (k_base_platform) {
 539                 platform_len = strlen(k_base_platform) + 1;
 540                 sp -= platform_len;
 541                 u_base_platform = (char __user *) sp;
 542                 if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0)
 543                         return -EFAULT;
 544         }
 545
 546         sp &= ~7UL;
 547
 548         /* stack the load map(s) */
 549         len = sizeof(struct elf32_fdpic_loadmap);
 550         len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs;
 551         sp = (sp - len) & ~7UL;
 552         exec_params->map_addr = sp;
 553
 554         if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0)
 555                 return -EFAULT;
 556
 557         current->mm->context.exec_fdpic_loadmap = (unsigned long) sp;
 558
 559         if (interp_params->loadmap) {
 560                 len = sizeof(struct elf32_fdpic_loadmap);
 561                 len += sizeof(struct elf32_fdpic_loadseg) *
 562                         interp_params->loadmap->nsegs;
 563                 sp = (sp - len) & ~7UL;
 564                 interp_params->map_addr = sp;
 565
 566                 if (copy_to_user((void __user *) sp, interp_params->loadmap,
 567                                  len) != 0)
 568                         return -EFAULT;
 569
 570                 current->mm->context.interp_fdpic_loadmap = (unsigned long) sp;
 571         }
 572
 573         /* force 16 byte _final_ alignment here for generality */
 574 #define DLINFO_ITEMS 15
 575
 576         nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) +
 577                 (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH;
 578
 579         if (bprm->interp_flags & BINPRM_FLAGS_EXECFD)
 580                 nitems++;
 581
 582         csp = sp;
 583         sp -= nitems * 2 * sizeof(unsigned long);
 584         sp -= (bprm->envc + 1) * sizeof(char *);        /* envv[] */
 585         sp -= (bprm->argc + 1) * sizeof(char *);        /* argv[] */
 586         sp -= 1 * sizeof(unsigned long);                /* argc */
 587
 588         csp -= sp & 15UL;
 589         sp -= sp & 15UL;
 590
 591         /* put the ELF interpreter info on the stack */
 592 #define NEW_AUX_ENT(id, val)                                            \
 593         do {                                                            \
 594                 struct { unsigned long _id, _val; } __user *ent;        \
 595                                                                         \
 596                 ent = (void __user *) csp;                              \
 597                 __put_user((id), &ent[nr]._id);                         \
 598                 __put_user((val), &ent[nr]._val);                       \
 599                 nr++;                                                   \
 600         } while (0)
 601
 602         nr = 0;
 603         csp -= 2 * sizeof(unsigned long);
 604         NEW_AUX_ENT(AT_NULL, 0);
 605         if (k_platform) {
 606                 nr = 0;
 607                 csp -= 2 * sizeof(unsigned long);
 608                 NEW_AUX_ENT(AT_PLATFORM,
 609                             (elf_addr_t) (unsigned long) u_platform);
 610         }
 611
 612         if (k_base_platform) {
 613                 nr = 0;
 614                 csp -= 2 * sizeof(unsigned long);
 615                 NEW_AUX_ENT(AT_BASE_PLATFORM,
 616                             (elf_addr_t) (unsigned long) u_base_platform);
 617         }
 618
 619         if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
 620                 nr = 0;
 621                 csp -= 2 * sizeof(unsigned long);
 622                 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
 623         }
 624
 625         nr = 0;
 626         csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long);
 627         NEW_AUX_ENT(AT_HWCAP,   hwcap);
 628         NEW_AUX_ENT(AT_PAGESZ,  PAGE_SIZE);
 629         NEW_AUX_ENT(AT_CLKTCK,  CLOCKS_PER_SEC);
 630         NEW_AUX_ENT(AT_PHDR,    exec_params->ph_addr);
 631         NEW_AUX_ENT(AT_PHENT,   sizeof(struct elf_phdr));
 632         NEW_AUX_ENT(AT_PHNUM,   exec_params->hdr.e_phnum);
 633         NEW_AUX_ENT(AT_BASE,    interp_params->elfhdr_addr);
 634         NEW_AUX_ENT(AT_FLAGS,   0);
 635         NEW_AUX_ENT(AT_ENTRY,   exec_params->entry_addr);
 636         NEW_AUX_ENT(AT_UID,     (elf_addr_t) cred->uid);
 637         NEW_AUX_ENT(AT_EUID,    (elf_addr_t) cred->euid);
 638         NEW_AUX_ENT(AT_GID,     (elf_addr_t) cred->gid);
 639         NEW_AUX_ENT(AT_EGID,    (elf_addr_t) cred->egid);
 640         NEW_AUX_ENT(AT_SECURE,  security_bprm_secureexec(bprm));
 641         NEW_AUX_ENT(AT_EXECFN,  bprm->exec);
 642
 643 #ifdef ARCH_DLINFO
 644         nr = 0;
 645         csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long);
 646
 647         /* ARCH_DLINFO must come last so platform specific code can enforce
 648          * special alignment requirements on the AUXV if necessary (eg. PPC).
 649          */
 650         ARCH_DLINFO;
 651 #endif
 652 #undef NEW_AUX_ENT
 653
 654         /* allocate room for argv[] and envv[] */
 655         csp -= (bprm->envc + 1) * sizeof(elf_caddr_t);
 656         envp = (elf_caddr_t __user *) csp;
 657         csp -= (bprm->argc + 1) * sizeof(elf_caddr_t);
 658         argv = (elf_caddr_t __user *) csp;
 659
 660         /* stack argc */
 661         csp -= sizeof(unsigned long);
 662         __put_user(bprm->argc, (unsigned long __user *) csp);
 663
 664         BUG_ON(csp != sp);
 665
 666         /* fill in the argv[] array */
 667 #ifdef CONFIG_MMU
 668         current->mm->arg_start = bprm->p;
 669 #else
 670         current->mm->arg_start = current->mm->start_stack -
 671                 (MAX_ARG_PAGES * PAGE_SIZE - bprm->p);
 672 #endif
 673
 674         p = (char __user *) current->mm->arg_start;
 675         for (loop = bprm->argc; loop > 0; loop--) {
 676                 __put_user((elf_caddr_t) p, argv++);
 677                 len = strnlen_user(p, MAX_ARG_STRLEN);
 678                 if (!len || len > MAX_ARG_STRLEN)
 679                         return -EINVAL;
 680                 p += len;
 681         }
 682         __put_user(NULL, argv);
 683         current->mm->arg_end = (unsigned long) p;
 684
 685         /* fill in the envv[] array */
 686         current->mm->env_start = (unsigned long) p;
 687         for (loop = bprm->envc; loop > 0; loop--) {
 688                 __put_user((elf_caddr_t)(unsigned long) p, envp++);
 689                 len = strnlen_user(p, MAX_ARG_STRLEN);
 690                 if (!len || len > MAX_ARG_STRLEN)
 691                         return -EINVAL;
 692                 p += len;
 693         }
 694         __put_user(NULL, envp);
 695         current->mm->env_end = (unsigned long) p;
 696
 697         mm->start_stack = (unsigned long) sp;
 698         return 0;
 699 }
 700
 701 /*****************************************************************************/
 702 /*
 703  * transfer the program arguments and environment from the holding pages onto
 704  * the stack
 705  */
 706 #ifndef CONFIG_MMU
 707 static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm,
 708                                             unsigned long *_sp)
 709 {
 710         unsigned long index, stop, sp;
 711         char *src;
 712         int ret = 0;
 713
 714         stop = bprm->p >> PAGE_SHIFT;
 715         sp = *_sp;
 716
 717         for (index = MAX_ARG_PAGES - 1; index >= stop; index--) {
 718                 src = kmap(bprm->page[index]);
 719                 sp -= PAGE_SIZE;
 720                 if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0)
 721                         ret = -EFAULT;
 722                 kunmap(bprm->page[index]);
 723                 if (ret < 0)
 724                         goto out;
 725         }
 726
 727         *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15;
 728
 729 out:
 730         return ret;
 731 }
 732 #endif
 733
 734 /*****************************************************************************/
 735 /*
 736  * load the appropriate binary image (executable or interpreter) into memory
 737  * - we assume no MMU is available
 738  * - if no other PIC bits are set in params->hdr->e_flags
 739  *   - we assume that the LOADable segments in the binary are independently relocatable
 740  *   - we assume R/O executable segments are shareable
 741  * - else
 742  *   - we assume the loadable parts of the image to require fixed displacement
 743  *   - the image is not shareable
 744  */
 745 static int elf_fdpic_map_file(struct elf_fdpic_params *params,
 746                               struct file *file,
 747                               struct mm_struct *mm,
 748                               const char *what)
 749 {
 750         struct elf32_fdpic_loadmap *loadmap;
 751 #ifdef CONFIG_MMU
 752         struct elf32_fdpic_loadseg *mseg;
 753 #endif
 754         struct elf32_fdpic_loadseg *seg;
 755         struct elf32_phdr *phdr;
 756         unsigned long load_addr, stop;
 757         unsigned nloads, tmp;
 758         size_t size;
 759         int loop, ret;
 760
 761         /* allocate a load map table */
 762         nloads = 0;
 763         for (loop = 0; loop < params->hdr.e_phnum; loop++)
 764                 if (params->phdrs[loop].p_type == PT_LOAD)
 765                         nloads++;
 766
 767         if (nloads == 0)
 768                 return -ELIBBAD;
 769
 770         size = sizeof(*loadmap) + nloads * sizeof(*seg);
 771         loadmap = kzalloc(size, GFP_KERNEL);
 772         if (!loadmap)
 773                 return -ENOMEM;
 774
 775         params->loadmap = loadmap;
 776
 777         loadmap->version = ELF32_FDPIC_LOADMAP_VERSION;
 778         loadmap->nsegs = nloads;
 779
 780         load_addr = params->load_addr;
 781         seg = loadmap->segs;
 782
 783         /* map the requested LOADs into the memory space */
 784         switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
 785         case ELF_FDPIC_FLAG_CONSTDISP:
 786         case ELF_FDPIC_FLAG_CONTIGUOUS:
 787 #ifndef CONFIG_MMU
 788                 ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm);
 789                 if (ret < 0)
 790                         return ret;
 791                 break;
 792 #endif
 793         default:
 794                 ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm);
 795                 if (ret < 0)
 796                         return ret;
 797                 break;
 798         }
 799
 800         /* map the entry point */
 801         if (params->hdr.e_entry) {
 802                 seg = loadmap->segs;
 803                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
 804                         if (params->hdr.e_entry >= seg->p_vaddr &&
 805                             params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) {
 806                                 params->entry_addr =
 807                                         (params->hdr.e_entry - seg->p_vaddr) +
 808                                         seg->addr;
 809                                 break;
 810                         }
 811                 }
 812         }
 813
 814         /* determine where the program header table has wound up if mapped */
 815         stop = params->hdr.e_phoff;
 816         stop += params->hdr.e_phnum * sizeof (struct elf_phdr);
 817         phdr = params->phdrs;
 818
 819         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 820                 if (phdr->p_type != PT_LOAD)
 821                         continue;
 822
 823                 if (phdr->p_offset > params->hdr.e_phoff ||
 824                     phdr->p_offset + phdr->p_filesz < stop)
 825                         continue;
 826
 827                 seg = loadmap->segs;
 828                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
 829                         if (phdr->p_vaddr >= seg->p_vaddr &&
 830                             phdr->p_vaddr + phdr->p_filesz <=
 831                             seg->p_vaddr + seg->p_memsz) {
 832                                 params->ph_addr =
 833                                         (phdr->p_vaddr - seg->p_vaddr) +
 834                                         seg->addr +
 835                                         params->hdr.e_phoff - phdr->p_offset;
 836                                 break;
 837                         }
 838                 }
 839                 break;
 840         }
 841
 842         /* determine where the dynamic section has wound up if there is one */
 843         phdr = params->phdrs;
 844         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 845                 if (phdr->p_type != PT_DYNAMIC)
 846                         continue;
 847
 848                 seg = loadmap->segs;
 849                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
 850                         if (phdr->p_vaddr >= seg->p_vaddr &&
 851                             phdr->p_vaddr + phdr->p_memsz <=
 852                             seg->p_vaddr + seg->p_memsz) {
 853                                 params->dynamic_addr =
 854                                         (phdr->p_vaddr - seg->p_vaddr) +
 855                                         seg->addr;
 856
 857                                 /* check the dynamic section contains at least
 858                                  * one item, and that the last item is a NULL
 859                                  * entry */
 860                                 if (phdr->p_memsz == 0 ||
 861                                     phdr->p_memsz % sizeof(Elf32_Dyn) != 0)
 862                                         goto dynamic_error;
 863
 864                                 tmp = phdr->p_memsz / sizeof(Elf32_Dyn);
 865                                 if (((Elf32_Dyn *)
 866                                      params->dynamic_addr)[tmp - 1].d_tag != 0)
 867                                         goto dynamic_error;
 868                                 break;
 869                         }
 870                 }
 871                 break;
 872         }
 873
 874         /* now elide adjacent segments in the load map on MMU linux
 875          * - on uClinux the holes between may actually be filled with system
 876          *   stuff or stuff from other processes
 877          */
 878 #ifdef CONFIG_MMU
 879         nloads = loadmap->nsegs;
 880         mseg = loadmap->segs;
 881         seg = mseg + 1;
 882         for (loop = 1; loop < nloads; loop++) {
 883                 /* see if we have a candidate for merging */
 884                 if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) {
 885                         load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz);
 886                         if (load_addr == (seg->addr & PAGE_MASK)) {
 887                                 mseg->p_memsz +=
 888                                         load_addr -
 889                                         (mseg->addr + mseg->p_memsz);
 890                                 mseg->p_memsz += seg->addr & ~PAGE_MASK;
 891                                 mseg->p_memsz += seg->p_memsz;
 892                                 loadmap->nsegs--;
 893                                 continue;
 894                         }
 895                 }
 896
 897                 mseg++;
 898                 if (mseg != seg)
 899                         *mseg = *seg;
 900         }
 901 #endif
 902
 903         kdebug("Mapped Object [%s]:", what);
 904         kdebug("- elfhdr   : %lx", params->elfhdr_addr);
 905         kdebug("- entry    : %lx", params->entry_addr);
 906         kdebug("- PHDR[]   : %lx", params->ph_addr);
 907         kdebug("- DYNAMIC[]: %lx", params->dynamic_addr);
 908         seg = loadmap->segs;
 909         for (loop = 0; loop < loadmap->nsegs; loop++, seg++)
 910                 kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]",
 911                        loop,
 912                        seg->addr, seg->addr + seg->p_memsz - 1,
 913                        seg->p_vaddr, seg->p_memsz);
 914
 915         return 0;
 916
 917 dynamic_error:
 918         printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n",
 919                what, file->f_path.dentry->d_inode->i_ino);
 920         return -ELIBBAD;
 921 }
 922
 923 /*****************************************************************************/
 924 /*
 925  * map a file with constant displacement under uClinux
 926  */
 927 #ifndef CONFIG_MMU
 928 static int elf_fdpic_map_file_constdisp_on_uclinux(
 929         struct elf_fdpic_params *params,
 930         struct file *file,
 931         struct mm_struct *mm)
 932 {
 933         struct elf32_fdpic_loadseg *seg;
 934         struct elf32_phdr *phdr;
 935         unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags;
 936         loff_t fpos;
 937         int loop, ret;
 938
 939         load_addr = params->load_addr;
 940         seg = params->loadmap->segs;
 941
 942         /* determine the bounds of the contiguous overall allocation we must
 943          * make */
 944         phdr = params->phdrs;
 945         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 946                 if (params->phdrs[loop].p_type != PT_LOAD)
 947                         continue;
 948
 949                 if (base > phdr->p_vaddr)
 950                         base = phdr->p_vaddr;
 951                 if (top < phdr->p_vaddr + phdr->p_memsz)
 952                         top = phdr->p_vaddr + phdr->p_memsz;
 953         }
 954
 955         /* allocate one big anon block for everything */
 956         mflags = MAP_PRIVATE;
 957         if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
 958                 mflags |= MAP_EXECUTABLE;
 959
 960         down_write(&mm->mmap_sem);
 961         maddr = do_mmap(NULL, load_addr, top - base,
 962                         PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0);
 963         up_write(&mm->mmap_sem);
 964         if (IS_ERR_VALUE(maddr))
 965                 return (int) maddr;
 966
 967         if (load_addr != 0)
 968                 load_addr += PAGE_ALIGN(top - base);
 969
 970         /* and then load the file segments into it */
 971         phdr = params->phdrs;
 972         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 973                 if (params->phdrs[loop].p_type != PT_LOAD)
 974                         continue;
 975
 976                 fpos = phdr->p_offset;
 977
 978                 seg->addr = maddr + (phdr->p_vaddr - base);
 979                 seg->p_vaddr = phdr->p_vaddr;
 980                 seg->p_memsz = phdr->p_memsz;
 981
 982                 ret = file->f_op->read(file, (void *) seg->addr,
 983                                        phdr->p_filesz, &fpos);
 984                 if (ret < 0)
 985                         return ret;
 986
 987                 /* map the ELF header address if in this segment */
 988                 if (phdr->p_offset == 0)
 989                         params->elfhdr_addr = seg->addr;
 990
 991                 /* clear any space allocated but not loaded */
 992                 if (phdr->p_filesz < phdr->p_memsz) {
 993                         ret = clear_user((void *) (seg->addr + phdr->p_filesz),
 994                                          phdr->p_memsz - phdr->p_filesz);
 995                         if (ret)
 996                                 return ret;
 997                 }
 998
 999                 if (mm) {
1000                         if (phdr->p_flags & PF_X) {
1001                                 if (!mm->start_code) {
1002                                         mm->start_code = seg->addr;
1003                                         mm->end_code = seg->addr +
1004                                                 phdr->p_memsz;
1005                                 }
1006                         } else if (!mm->start_data) {
1007                                 mm->start_data = seg->addr;
1008                                 mm->end_data = seg->addr + phdr->p_memsz;
1009                         }
1010                 }
1011
1012                 seg++;
1013         }
1014
1015         return 0;
1016 }
1017 #endif
1018
1019 /*****************************************************************************/
1020 /*
1021  * map a binary by direct mmap() of the individual PT_LOAD segments
1022  */
1023 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
1024                                              struct file *file,
1025                                              struct mm_struct *mm)
1026 {
1027         struct elf32_fdpic_loadseg *seg;
1028         struct elf32_phdr *phdr;
1029         unsigned long load_addr, delta_vaddr;
1030         int loop, dvset, ret;
1031
1032         load_addr = params->load_addr;
1033         delta_vaddr = 0;
1034         dvset = 0;
1035
1036         seg = params->loadmap->segs;
1037
1038         /* deal with each load segment separately */
1039         phdr = params->phdrs;
1040         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
1041                 unsigned long maddr, disp, excess, excess1;
1042                 int prot = 0, flags;
1043
1044                 if (phdr->p_type != PT_LOAD)
1045                         continue;
1046
1047                 kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx",
1048                        (unsigned long) phdr->p_vaddr,
1049                        (unsigned long) phdr->p_offset,
1050                        (unsigned long) phdr->p_filesz,
1051                        (unsigned long) phdr->p_memsz);
1052
1053                 /* determine the mapping parameters */
1054                 if (phdr->p_flags & PF_R) prot |= PROT_READ;
1055                 if (phdr->p_flags & PF_W) prot |= PROT_WRITE;
1056                 if (phdr->p_flags & PF_X) prot |= PROT_EXEC;
1057
1058                 flags = MAP_PRIVATE | MAP_DENYWRITE;
1059                 if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
1060                         flags |= MAP_EXECUTABLE;
1061
1062                 maddr = 0;
1063
1064                 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
1065                 case ELF_FDPIC_FLAG_INDEPENDENT:
1066                         /* PT_LOADs are independently locatable */
1067                         break;
1068
1069                 case ELF_FDPIC_FLAG_HONOURVADDR:
1070                         /* the specified virtual address must be honoured */
1071                         maddr = phdr->p_vaddr;
1072                         flags |= MAP_FIXED;
1073                         break;
1074
1075                 case ELF_FDPIC_FLAG_CONSTDISP:
1076                         /* constant displacement
1077                          * - can be mapped anywhere, but must be mapped as a
1078                          *   unit
1079                          */
1080                         if (!dvset) {
1081                                 maddr = load_addr;
1082                                 delta_vaddr = phdr->p_vaddr;
1083                                 dvset = 1;
1084                         } else {
1085                                 maddr = load_addr + phdr->p_vaddr - delta_vaddr;
1086                                 flags |= MAP_FIXED;
1087                         }
1088                         break;
1089
1090                 case ELF_FDPIC_FLAG_CONTIGUOUS:
1091                         /* contiguity handled later */
1092                         break;
1093
1094                 default:
1095                         BUG();
1096                 }
1097
1098                 maddr &= PAGE_MASK;
1099
1100                 /* create the mapping */
1101                 disp = phdr->p_vaddr & ~PAGE_MASK;
1102                 down_write(&mm->mmap_sem);
1103                 maddr = do_mmap(file, maddr, phdr->p_memsz + disp, prot, flags,
1104                                 phdr->p_offset - disp);
1105                 up_write(&mm->mmap_sem);
1106
1107                 kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx",
1108                        loop, phdr->p_memsz + disp, prot, flags,
1109                        phdr->p_offset - disp, maddr);
1110
1111                 if (IS_ERR_VALUE(maddr))
1112                         return (int) maddr;
1113
1114                 if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
1115                     ELF_FDPIC_FLAG_CONTIGUOUS)
1116                         load_addr += PAGE_ALIGN(phdr->p_memsz + disp);
1117
1118                 seg->addr = maddr + disp;
1119                 seg->p_vaddr = phdr->p_vaddr;
1120                 seg->p_memsz = phdr->p_memsz;
1121
1122                 /* map the ELF header address if in this segment */
1123                 if (phdr->p_offset == 0)
1124                         params->elfhdr_addr = seg->addr;
1125
1126                 /* clear the bit between beginning of mapping and beginning of
1127                  * PT_LOAD */
1128                 if (prot & PROT_WRITE && disp > 0) {
1129                         kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp);
1130                         ret = clear_user((void __user *) maddr, disp);
1131                         if (ret)
1132                                 return ret;
1133                         maddr += disp;
1134                 }
1135
1136                 /* clear any space allocated but not loaded
1137                  * - on uClinux we can just clear the lot
1138                  * - on MMU linux we'll get a SIGBUS beyond the last page
1139                  *   extant in the file
1140                  */
1141                 excess = phdr->p_memsz - phdr->p_filesz;
1142                 excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK);
1143
1144 #ifdef CONFIG_MMU
1145                 if (excess > excess1) {
1146                         unsigned long xaddr = maddr + phdr->p_filesz + excess1;
1147                         unsigned long xmaddr;
1148
1149                         flags |= MAP_FIXED | MAP_ANONYMOUS;
1150                         down_write(&mm->mmap_sem);
1151                         xmaddr = do_mmap(NULL, xaddr, excess - excess1,
1152                                          prot, flags, 0);
1153                         up_write(&mm->mmap_sem);
1154
1155                         kdebug("mmap[%d] <anon>"
1156                                " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx",
1157                                loop, xaddr, excess - excess1, prot, flags,
1158                                xmaddr);
1159
1160                         if (xmaddr != xaddr)
1161                                 return -ENOMEM;
1162                 }
1163
1164                 if (prot & PROT_WRITE && excess1 > 0) {
1165                         kdebug("clear[%d] ad=%lx sz=%lx",
1166                                loop, maddr + phdr->p_filesz, excess1);
1167                         ret = clear_user((void __user *) maddr + phdr->p_filesz,
1168                                          excess1);
1169                         if (ret)
1170                                 return ret;
1171                 }
1172
1173 #else
1174                 if (excess > 0) {
1175                         kdebug("clear[%d] ad=%lx sz=%lx",
1176                                loop, maddr + phdr->p_filesz, excess);
1177                         ret = clear_user((void *) maddr + phdr->p_filesz, excess);
1178                         if (ret)
1179                                 return ret;
1180                 }
1181 #endif
1182
1183                 if (mm) {
1184                         if (phdr->p_flags & PF_X) {
1185                                 if (!mm->start_code) {
1186                                         mm->start_code = maddr;
1187                                         mm->end_code = maddr + phdr->p_memsz;
1188                                 }
1189                         } else if (!mm->start_data) {
1190                                 mm->start_data = maddr;
1191                                 mm->end_data = maddr + phdr->p_memsz;
1192                         }
1193                 }
1194
1195                 seg++;
1196         }
1197
1198         return 0;
1199 }
1200
1201 /*****************************************************************************/
1202 /*
1203  * ELF-FDPIC core dumper
1204  *
1205  * Modelled on fs/exec.c:aout_core_dump()
1206  * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1207  *
1208  * Modelled on fs/binfmt_elf.c core dumper
1209  */
1210 #ifdef CONFIG_ELF_CORE
1211
1212 /*
1213  * Decide whether a segment is worth dumping; default is yes to be
1214  * sure (missing info is worse than too much; etc).
1215  * Personally I'd include everything, and use the coredump limit...
1216  *
1217  * I think we should skip something. But I am not sure how. H.J.
1218  */
1219 static int maydump(struct vm_area_struct *vma, unsigned long mm_flags)
1220 {
1221         int dump_ok;
1222
1223         /* Do not dump I/O mapped devices or special mappings */
1224         if (vma->vm_flags & (VM_IO | VM_RESERVED)) {
1225                 kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags);
1226                 return 0;
1227         }
1228
1229         /* If we may not read the contents, don't allow us to dump
1230          * them either. "dump_write()" can't handle it anyway.
1231          */
1232         if (!(vma->vm_flags & VM_READ)) {
1233                 kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags);
1234                 return 0;
1235         }
1236
1237         /* By default, dump shared memory if mapped from an anonymous file. */
1238         if (vma->vm_flags & VM_SHARED) {
1239                 if (vma->vm_file->f_path.dentry->d_inode->i_nlink == 0) {
1240                         dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags);
1241                         kdcore("%08lx: %08lx: %s (share)", vma->vm_start,
1242                                vma->vm_flags, dump_ok ? "yes" : "no");
1243                         return dump_ok;
1244                 }
1245
1246                 dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags);
1247                 kdcore("%08lx: %08lx: %s (share)", vma->vm_start,
1248                        vma->vm_flags, dump_ok ? "yes" : "no");
1249                 return dump_ok;
1250         }
1251
1252 #ifdef CONFIG_MMU
1253         /* By default, if it hasn't been written to, don't write it out */
1254         if (!vma->anon_vma) {
1255                 dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags);
1256                 kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start,
1257                        vma->vm_flags, dump_ok ? "yes" : "no");
1258                 return dump_ok;
1259         }
1260 #endif
1261
1262         dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags);
1263         kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags,
1264                dump_ok ? "yes" : "no");
1265         return dump_ok;
1266 }
1267
1268 /* An ELF note in memory */
1269 struct memelfnote
1270 {
1271         const char *name;
1272         int type;
1273         unsigned int datasz;
1274         void *data;
1275 };
1276
1277 static int notesize(struct memelfnote *en)
1278 {
1279         int sz;
1280
1281         sz = sizeof(struct elf_note);
1282         sz += roundup(strlen(en->name) + 1, 4);
1283         sz += roundup(en->datasz, 4);
1284
1285         return sz;
1286 }
1287
1288 /* #define DEBUG */
1289
1290 #define DUMP_WRITE(addr, nr, foffset)   \
1291         do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0)
1292
1293 static int alignfile(struct file *file, loff_t *foffset)
1294 {
1295         static const char buf[4] = { 0, };
1296         DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset);
1297         return 1;
1298 }
1299
1300 static int writenote(struct memelfnote *men, struct file *file,
1301                         loff_t *foffset)
1302 {
1303         struct elf_note en;
1304         en.n_namesz = strlen(men->name) + 1;
1305         en.n_descsz = men->datasz;
1306         en.n_type = men->type;
1307
1308         DUMP_WRITE(&en, sizeof(en), foffset);
1309         DUMP_WRITE(men->name, en.n_namesz, foffset);
1310         if (!alignfile(file, foffset))
1311                 return 0;
1312         DUMP_WRITE(men->data, men->datasz, foffset);
1313         if (!alignfile(file, foffset))
1314                 return 0;
1315
1316         return 1;
1317 }
1318 #undef DUMP_WRITE
1319
1320 static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
1321 {
1322         memcpy(elf->e_ident, ELFMAG, SELFMAG);
1323         elf->e_ident[EI_CLASS] = ELF_CLASS;
1324         elf->e_ident[EI_DATA] = ELF_DATA;
1325         elf->e_ident[EI_VERSION] = EV_CURRENT;
1326         elf->e_ident[EI_OSABI] = ELF_OSABI;
1327         memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
1328
1329         elf->e_type = ET_CORE;
1330         elf->e_machine = ELF_ARCH;
1331         elf->e_version = EV_CURRENT;
1332         elf->e_entry = 0;
1333         elf->e_phoff = sizeof(struct elfhdr);
1334         elf->e_shoff = 0;
1335         elf->e_flags = ELF_FDPIC_CORE_EFLAGS;
1336         elf->e_ehsize = sizeof(struct elfhdr);
1337         elf->e_phentsize = sizeof(struct elf_phdr);
1338         elf->e_phnum = segs;
1339         elf->e_shentsize = 0;
1340         elf->e_shnum = 0;
1341         elf->e_shstrndx = 0;
1342         return;
1343 }
1344
1345 static inline void fill_elf_note_phdr(struct elf_phdr *phdr, int sz, loff_t offset)
1346 {
1347         phdr->p_type = PT_NOTE;
1348         phdr->p_offset = offset;
1349         phdr->p_vaddr = 0;
1350         phdr->p_paddr = 0;
1351         phdr->p_filesz = sz;
1352         phdr->p_memsz = 0;
1353         phdr->p_flags = 0;
1354         phdr->p_align = 0;
1355         return;
1356 }
1357
1358 static inline void fill_note(struct memelfnote *note, const char *name, int type,
1359                 unsigned int sz, void *data)
1360 {
1361         note->name = name;
1362         note->type = type;
1363         note->datasz = sz;
1364         note->data = data;
1365         return;
1366 }
1367
1368 /*
1369  * fill up all the fields in prstatus from the given task struct, except
1370  * registers which need to be filled up separately.
1371  */
1372 static void fill_prstatus(struct elf_prstatus *prstatus,
1373                           struct task_struct *p, long signr)
1374 {
1375         prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
1376         prstatus->pr_sigpend = p->pending.signal.sig[0];
1377         prstatus->pr_sighold = p->blocked.sig[0];
1378         rcu_read_lock();
1379         prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1380         rcu_read_unlock();
1381         prstatus->pr_pid = task_pid_vnr(p);
1382         prstatus->pr_pgrp = task_pgrp_vnr(p);
1383         prstatus->pr_sid = task_session_vnr(p);
1384         if (thread_group_leader(p)) {
1385                 struct task_cputime cputime;
1386
1387                 /*
1388                  * This is the record for the group leader.  It shows the
1389                  * group-wide total, not its individual thread total.
1390                  */
1391                 thread_group_cputime(p, &cputime);
1392                 cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
1393                 cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
1394         } else {
1395                 cputime_to_timeval(p->utime, &prstatus->pr_utime);
1396                 cputime_to_timeval(p->stime, &prstatus->pr_stime);
1397         }
1398         cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1399         cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1400
1401         prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap;
1402         prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap;
1403 }
1404
1405 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1406                        struct mm_struct *mm)
1407 {
1408         const struct cred *cred;
1409         unsigned int i, len;
1410
1411         /* first copy the parameters from user space */
1412         memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1413
1414         len = mm->arg_end - mm->arg_start;
1415         if (len >= ELF_PRARGSZ)
1416                 len = ELF_PRARGSZ - 1;
1417         if (copy_from_user(&psinfo->pr_psargs,
1418                            (const char __user *) mm->arg_start, len))
1419                 return -EFAULT;
1420         for (i = 0; i < len; i++)
1421                 if (psinfo->pr_psargs[i] == 0)
1422                         psinfo->pr_psargs[i] = ' ';
1423         psinfo->pr_psargs[len] = 0;
1424
1425         rcu_read_lock();
1426         psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1427         rcu_read_unlock();
1428         psinfo->pr_pid = task_pid_vnr(p);
1429         psinfo->pr_pgrp = task_pgrp_vnr(p);
1430         psinfo->pr_sid = task_session_vnr(p);
1431
1432         i = p->state ? ffz(~p->state) + 1 : 0;
1433         psinfo->pr_state = i;
1434         psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1435         psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1436         psinfo->pr_nice = task_nice(p);
1437         psinfo->pr_flag = p->flags;
1438         rcu_read_lock();
1439         cred = __task_cred(p);
1440         SET_UID(psinfo->pr_uid, cred->uid);
1441         SET_GID(psinfo->pr_gid, cred->gid);
1442         rcu_read_unlock();
1443         strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1444
1445         return 0;
1446 }
1447
1448 /* Here is the structure in which status of each thread is captured. */
1449 struct elf_thread_status
1450 {
1451         struct list_head list;
1452         struct elf_prstatus prstatus;   /* NT_PRSTATUS */
1453         elf_fpregset_t fpu;             /* NT_PRFPREG */
1454         struct task_struct *thread;
1455 #ifdef ELF_CORE_COPY_XFPREGS
1456         elf_fpxregset_t xfpu;           /* ELF_CORE_XFPREG_TYPE */
1457 #endif
1458         struct memelfnote notes[3];
1459         int num_notes;
1460 };
1461
1462 /*
1463  * In order to add the specific thread information for the elf file format,
1464  * we need to keep a linked list of every thread's pr_status and then create
1465  * a single section for them in the final core file.
1466  */
1467 static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1468 {
1469         struct task_struct *p = t->thread;
1470         int sz = 0;
1471
1472         t->num_notes = 0;
1473
1474         fill_prstatus(&t->prstatus, p, signr);
1475         elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1476
1477         fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1478                   &t->prstatus);
1479         t->num_notes++;
1480         sz += notesize(&t->notes[0]);
1481
1482         t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu);
1483         if (t->prstatus.pr_fpvalid) {
1484                 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1485                           &t->fpu);
1486                 t->num_notes++;
1487                 sz += notesize(&t->notes[1]);
1488         }
1489
1490 #ifdef ELF_CORE_COPY_XFPREGS
1491         if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1492                 fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
1493                           sizeof(t->xfpu), &t->xfpu);
1494                 t->num_notes++;
1495                 sz += notesize(&t->notes[2]);
1496         }
1497 #endif
1498         return sz;
1499 }
1500
1501 static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
1502                              elf_addr_t e_shoff, int segs)
1503 {
1504         elf->e_shoff = e_shoff;
1505         elf->e_shentsize = sizeof(*shdr4extnum);
1506         elf->e_shnum = 1;
1507         elf->e_shstrndx = SHN_UNDEF;
1508
1509         memset(shdr4extnum, 0, sizeof(*shdr4extnum));
1510
1511         shdr4extnum->sh_type = SHT_NULL;
1512         shdr4extnum->sh_size = elf->e_shnum;
1513         shdr4extnum->sh_link = elf->e_shstrndx;
1514         shdr4extnum->sh_info = segs;
1515 }
1516
1517 /*
1518  * dump the segments for an MMU process
1519  */
1520 #ifdef CONFIG_MMU
1521 static int elf_fdpic_dump_segments(struct file *file, size_t *size,
1522                            unsigned long *limit, unsigned long mm_flags)
1523 {
1524         struct vm_area_struct *vma;
1525         int err = 0;
1526
1527         for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1528                 unsigned long addr;
1529
1530                 if (!maydump(vma, mm_flags))
1531                         continue;
1532
1533                 for (addr = vma->vm_start; addr < vma->vm_end;
1534                                                         addr += PAGE_SIZE) {
1535                         struct page *page = get_dump_page(addr);
1536                         if (page) {
1537                                 void *kaddr = kmap(page);
1538                                 *size += PAGE_SIZE;
1539                                 if (*size > *limit)
1540                                         err = -EFBIG;
1541                                 else if (!dump_write(file, kaddr, PAGE_SIZE))
1542                                         err = -EIO;
1543                                 kunmap(page);
1544                                 page_cache_release(page);
1545                         } else if (!dump_seek(file, PAGE_SIZE))
1546                                 err = -EFBIG;
1547                         if (err)
1548                                 goto out;
1549                 }
1550         }
1551 out:
1552         return err;
1553 }
1554 #endif
1555
1556 /*
1557  * dump the segments for a NOMMU process
1558  */
1559 #ifndef CONFIG_MMU
1560 static int elf_fdpic_dump_segments(struct file *file, size_t *size,
1561                            unsigned long *limit, unsigned long mm_flags)
1562 {
1563         struct vm_area_struct *vma;
1564
1565         for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1566                 if (!maydump(vma, mm_flags))
1567                         continue;
1568
1569                 if ((*size += PAGE_SIZE) > *limit)
1570                         return -EFBIG;
1571
1572                 if (!dump_write(file, (void *) vma->vm_start,
1573                                 vma->vm_end - vma->vm_start))
1574                         return -EIO;
1575         }
1576
1577         return 0;
1578 }
1579 #endif
1580
1581 static size_t elf_core_vma_data_size(unsigned long mm_flags)
1582 {
1583         struct vm_area_struct *vma;
1584         size_t size = 0;
1585
1586         for (vma = current->mm->mmap; vma; vma = vma->vm_next)
1587                 if (maydump(vma, mm_flags))
1588                         size += vma->vm_end - vma->vm_start;
1589         return size;
1590 }
1591
1592 /*
1593  * Actual dumper
1594  *
1595  * This is a two-pass process; first we find the offsets of the bits,
1596  * and then they are actually written out.  If we run out of core limit
1597  * we just truncate.
1598  */
1599 static int elf_fdpic_core_dump(struct coredump_params *cprm)
1600 {
1601 #define NUM_NOTES       6
1602         int has_dumped = 0;
1603         mm_segment_t fs;
1604         int segs;
1605         size_t size = 0;
1606         int i;
1607         struct vm_area_struct *vma;
1608         struct elfhdr *elf = NULL;
1609         loff_t offset = 0, dataoff, foffset;
1610         int numnote;
1611         struct memelfnote *notes = NULL;
1612         struct elf_prstatus *prstatus = NULL;   /* NT_PRSTATUS */
1613         struct elf_prpsinfo *psinfo = NULL;     /* NT_PRPSINFO */
1614         LIST_HEAD(thread_list);
1615         struct list_head *t;
1616         elf_fpregset_t *fpu = NULL;
1617 #ifdef ELF_CORE_COPY_XFPREGS
1618         elf_fpxregset_t *xfpu = NULL;
1619 #endif
1620         int thread_status_size = 0;
1621         elf_addr_t *auxv;
1622         struct elf_phdr *phdr4note = NULL;
1623         struct elf_shdr *shdr4extnum = NULL;
1624         Elf_Half e_phnum;
1625         elf_addr_t e_shoff;
1626
1627         /*
1628          * We no longer stop all VM operations.
1629          *
1630          * This is because those proceses that could possibly change map_count
1631          * or the mmap / vma pages are now blocked in do_exit on current
1632          * finishing this core dump.
1633          *
1634          * Only ptrace can touch these memory addresses, but it doesn't change
1635          * the map_count or the pages allocated. So no possibility of crashing
1636          * exists while dumping the mm->vm_next areas to the core file.
1637          */
1638
1639         /* alloc memory for large data structures: too large to be on stack */
1640         elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1641         if (!elf)
1642                 goto cleanup;
1643         prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL);
1644         if (!prstatus)
1645                 goto cleanup;
1646         psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1647         if (!psinfo)
1648                 goto cleanup;
1649         notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
1650         if (!notes)
1651                 goto cleanup;
1652         fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
1653         if (!fpu)
1654                 goto cleanup;
1655 #ifdef ELF_CORE_COPY_XFPREGS
1656         xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
1657         if (!xfpu)
1658                 goto cleanup;
1659 #endif
1660
1661         if (cprm->signr) {
1662                 struct core_thread *ct;
1663                 struct elf_thread_status *tmp;
1664
1665                 for (ct = current->mm->core_state->dumper.next;
1666                                                 ct; ct = ct->next) {
1667                         tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
1668                         if (!tmp)
1669                                 goto cleanup;
1670
1671                         tmp->thread = ct->task;
1672                         list_add(&tmp->list, &thread_list);
1673                 }
1674
1675                 list_for_each(t, &thread_list) {
1676                         struct elf_thread_status *tmp;
1677                         int sz;
1678
1679                         tmp = list_entry(t, struct elf_thread_status, list);
1680                         sz = elf_dump_thread_status(cprm->signr, tmp);
1681                         thread_status_size += sz;
1682                 }
1683         }
1684
1685         /* now collect the dump for the current */
1686         fill_prstatus(prstatus, current, cprm->signr);
1687         elf_core_copy_regs(&prstatus->pr_reg, cprm->regs);
1688
1689         segs = current->mm->map_count;
1690         segs += elf_core_extra_phdrs();
1691
1692         /* for notes section */
1693         segs++;
1694
1695         /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
1696          * this, kernel supports extended numbering. Have a look at
1697          * include/linux/elf.h for further information. */
1698         e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
1699
1700         /* Set up header */
1701         fill_elf_fdpic_header(elf, e_phnum);
1702
1703         has_dumped = 1;
1704         current->flags |= PF_DUMPCORE;
1705
1706         /*
1707          * Set up the notes in similar form to SVR4 core dumps made
1708          * with info from their /proc.
1709          */
1710
1711         fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
1712         fill_psinfo(psinfo, current->group_leader, current->mm);
1713         fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1714
1715         numnote = 2;
1716
1717         auxv = (elf_addr_t *) current->mm->saved_auxv;
1718
1719         i = 0;
1720         do
1721                 i += 2;
1722         while (auxv[i - 2] != AT_NULL);
1723         fill_note(&notes[numnote++], "CORE", NT_AUXV,
1724                   i * sizeof(elf_addr_t), auxv);
1725
1726         /* Try to dump the FPU. */
1727         if ((prstatus->pr_fpvalid =
1728              elf_core_copy_task_fpregs(current, cprm->regs, fpu)))
1729                 fill_note(notes + numnote++,
1730                           "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
1731 #ifdef ELF_CORE_COPY_XFPREGS
1732         if (elf_core_copy_task_xfpregs(current, xfpu))
1733                 fill_note(notes + numnote++,
1734                           "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu);
1735 #endif
1736
1737         fs = get_fs();
1738         set_fs(KERNEL_DS);
1739
1740         offset += sizeof(*elf);                         /* Elf header */
1741         offset += segs * sizeof(struct elf_phdr);       /* Program headers */
1742         foffset = offset;
1743
1744         /* Write notes phdr entry */
1745         {
1746                 int sz = 0;
1747
1748                 for (i = 0; i < numnote; i++)
1749                         sz += notesize(notes + i);
1750
1751                 sz += thread_status_size;
1752
1753                 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
1754                 if (!phdr4note)
1755                         goto end_coredump;
1756
1757                 fill_elf_note_phdr(phdr4note, sz, offset);
1758                 offset += sz;
1759         }
1760
1761         /* Page-align dumped data */
1762         dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1763
1764         offset += elf_core_vma_data_size(cprm->mm_flags);
1765         offset += elf_core_extra_data_size();
1766         e_shoff = offset;
1767
1768         if (e_phnum == PN_XNUM) {
1769                 shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
1770                 if (!shdr4extnum)
1771                         goto end_coredump;
1772                 fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
1773         }
1774
1775         offset = dataoff;
1776
1777         size += sizeof(*elf);
1778         if (size > cprm->limit || !dump_write(cprm->file, elf, sizeof(*elf)))
1779                 goto end_coredump;
1780
1781         size += sizeof(*phdr4note);
1782         if (size > cprm->limit
1783             || !dump_write(cprm->file, phdr4note, sizeof(*phdr4note)))
1784                 goto end_coredump;
1785
1786         /* write program headers for segments dump */
1787         for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1788                 struct elf_phdr phdr;
1789                 size_t sz;
1790
1791                 sz = vma->vm_end - vma->vm_start;
1792
1793                 phdr.p_type = PT_LOAD;
1794                 phdr.p_offset = offset;
1795                 phdr.p_vaddr = vma->vm_start;
1796                 phdr.p_paddr = 0;
1797                 phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0;
1798                 phdr.p_memsz = sz;
1799                 offset += phdr.p_filesz;
1800                 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
1801                 if (vma->vm_flags & VM_WRITE)
1802                         phdr.p_flags |= PF_W;
1803                 if (vma->vm_flags & VM_EXEC)
1804                         phdr.p_flags |= PF_X;
1805                 phdr.p_align = ELF_EXEC_PAGESIZE;
1806
1807                 size += sizeof(phdr);
1808                 if (size > cprm->limit
1809                     || !dump_write(cprm->file, &phdr, sizeof(phdr)))
1810                         goto end_coredump;
1811         }
1812
1813         if (!elf_core_write_extra_phdrs(cprm->file, offset, &size, cprm->limit))
1814                 goto end_coredump;
1815
1816         /* write out the notes section */
1817         for (i = 0; i < numnote; i++)
1818                 if (!writenote(notes + i, cprm->file, &foffset))
1819                         goto end_coredump;
1820
1821         /* write out the thread status notes section */
1822         list_for_each(t, &thread_list) {
1823                 struct elf_thread_status *tmp =
1824                                 list_entry(t, struct elf_thread_status, list);
1825
1826                 for (i = 0; i < tmp->num_notes; i++)
1827                         if (!writenote(&tmp->notes[i], cprm->file, &foffset))
1828                                 goto end_coredump;
1829         }
1830
1831         if (!dump_seek(cprm->file, dataoff - foffset))
1832                 goto end_coredump;
1833
1834         if (elf_fdpic_dump_segments(cprm->file, &size, &cprm->limit,
1835                                     cprm->mm_flags) < 0)
1836                 goto end_coredump;
1837
1838         if (!elf_core_write_extra_data(cprm->file, &size, cprm->limit))
1839                 goto end_coredump;
1840
1841         if (e_phnum == PN_XNUM) {
1842                 size += sizeof(*shdr4extnum);
1843                 if (size > cprm->limit
1844                     || !dump_write(cprm->file, shdr4extnum,
1845                                    sizeof(*shdr4extnum)))
1846                         goto end_coredump;
1847         }
1848
1849         if (cprm->file->f_pos != offset) {
1850                 /* Sanity check */
1851                 printk(KERN_WARNING
1852                        "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
1853                        cprm->file->f_pos, offset);
1854         }
1855
1856 end_coredump:
1857         set_fs(fs);
1858
1859 cleanup:
1860         while (!list_empty(&thread_list)) {
1861                 struct list_head *tmp = thread_list.next;
1862                 list_del(tmp);
1863                 kfree(list_entry(tmp, struct elf_thread_status, list));
1864         }
1865         kfree(phdr4note);
1866         kfree(elf);
1867         kfree(prstatus);
1868         kfree(psinfo);
1869         kfree(notes);
1870         kfree(fpu);
1871 #ifdef ELF_CORE_COPY_XFPREGS
1872         kfree(xfpu);
1873 #endif
1874         return has_dumped;
1875 #undef NUM_NOTES
1876 }
1877
1878 #endif          /* CONFIG_ELF_CORE */