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