fs/binfmt_elf_fdpic.c

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