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