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