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