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 #include <linux/dax.h>
  39
  40 #include <asm/uaccess.h>
  41 #include <asm/param.h>
  42 #include <asm/pgalloc.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 *);
  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(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))
 114                 return 0;
 115         if (!file->f_op->mmap)
 116                 return 0;
 117         return 1;
 118 }
 119
 120 #ifndef elf_check_fdpic
 121 #define elf_check_fdpic(x) 0
 122 #endif
 123
 124 #ifndef elf_check_const_displacement
 125 #define elf_check_const_displacement(x) 0
 126 #endif
 127
 128 static int is_constdisp(struct elfhdr *hdr)
 129 {
 130         if (!elf_check_fdpic(hdr))
 131                 return 1;
 132         if (elf_check_const_displacement(hdr))
 133                 return 1;
 134         return 0;
 135 }
 136
 137 /*****************************************************************************/
 138 /*
 139  * read the program headers table into memory
 140  */
 141 static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params,
 142                                  struct file *file)
 143 {
 144         struct elf32_phdr *phdr;
 145         unsigned long size;
 146         int retval, loop;
 147
 148         if (params->hdr.e_phentsize != sizeof(struct elf_phdr))
 149                 return -ENOMEM;
 150         if (params->hdr.e_phnum > 65536U / sizeof(struct elf_phdr))
 151                 return -ENOMEM;
 152
 153         size = params->hdr.e_phnum * sizeof(struct elf_phdr);
 154         params->phdrs = kmalloc(size, GFP_KERNEL);
 155         if (!params->phdrs)
 156                 return -ENOMEM;
 157
 158         retval = kernel_read(file, params->hdr.e_phoff,
 159                              (char *) params->phdrs, size);
 160         if (unlikely(retval != size))
 161                 return retval < 0 ? retval : -ENOEXEC;
 162
 163         /* determine stack size for this binary */
 164         phdr = params->phdrs;
 165         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 166                 if (phdr->p_type != PT_GNU_STACK)
 167                         continue;
 168
 169                 if (phdr->p_flags & PF_X)
 170                         params->flags |= ELF_FDPIC_FLAG_EXEC_STACK;
 171                 else
 172                         params->flags |= ELF_FDPIC_FLAG_NOEXEC_STACK;
 173
 174                 params->stack_size = phdr->p_memsz;
 175                 break;
 176         }
 177
 178         return 0;
 179 }
 180
 181 /*****************************************************************************/
 182 /*
 183  * load an fdpic binary into various bits of memory
 184  */
 185 static int load_elf_fdpic_binary(struct linux_binprm *bprm)
 186 {
 187         struct elf_fdpic_params exec_params, interp_params;
 188         struct pt_regs *regs = current_pt_regs();
 189         struct elf_phdr *phdr;
 190         unsigned long stack_size, entryaddr;
 191 #ifdef ELF_FDPIC_PLAT_INIT
 192         unsigned long dynaddr;
 193 #endif
 194 #ifndef CONFIG_MMU
 195         unsigned long stack_prot;
 196 #endif
 197         struct file *interpreter = NULL; /* to shut gcc up */
 198         char *interpreter_name = NULL;
 199         int executable_stack;
 200         int retval, i;
 201
 202         kdebug("____ LOAD %d ____", current->pid);
 203
 204         memset(&exec_params, 0, sizeof(exec_params));
 205         memset(&interp_params, 0, sizeof(interp_params));
 206
 207         exec_params.hdr = *(struct elfhdr *) bprm->buf;
 208         exec_params.flags = ELF_FDPIC_FLAG_PRESENT | ELF_FDPIC_FLAG_EXECUTABLE;
 209
 210         /* check that this is a binary we know how to deal with */
 211         retval = -ENOEXEC;
 212         if (!is_elf(&exec_params.hdr, bprm->file))
 213                 goto error;
 214         if (!elf_check_fdpic(&exec_params.hdr)) {
 215 #ifdef CONFIG_MMU
 216                 /* binfmt_elf handles non-fdpic elf except on nommu */
 217                 goto error;
 218 #else
 219                 /* nommu can only load ET_DYN (PIE) ELF */
 220                 if (exec_params.hdr.e_type != ET_DYN)
 221                         goto error;
 222 #endif
 223         }
 224
 225         /* read the program header table */
 226         retval = elf_fdpic_fetch_phdrs(&exec_params, bprm->file);
 227         if (retval < 0)
 228                 goto error;
 229
 230         /* scan for a program header that specifies an interpreter */
 231         phdr = exec_params.phdrs;
 232
 233         for (i = 0; i < exec_params.hdr.e_phnum; i++, phdr++) {
 234                 switch (phdr->p_type) {
 235                 case PT_INTERP:
 236                         retval = -ENOMEM;
 237                         if (phdr->p_filesz > PATH_MAX)
 238                                 goto error;
 239                         retval = -ENOENT;
 240                         if (phdr->p_filesz < 2)
 241                                 goto error;
 242
 243                         /* read the name of the interpreter into memory */
 244                         interpreter_name = kmalloc(phdr->p_filesz, GFP_KERNEL);
 245                         if (!interpreter_name)
 246                                 goto error;
 247
 248                         retval = kernel_read(bprm->file,
 249                                              phdr->p_offset,
 250                                              interpreter_name,
 251                                              phdr->p_filesz);
 252                         if (unlikely(retval != phdr->p_filesz)) {
 253                                 if (retval >= 0)
 254                                         retval = -ENOEXEC;
 255                                 goto error;
 256                         }
 257
 258                         retval = -ENOENT;
 259                         if (interpreter_name[phdr->p_filesz - 1] != '\0')
 260                                 goto error;
 261
 262                         kdebug("Using ELF interpreter %s", interpreter_name);
 263
 264                         /* replace the program with the interpreter */
 265                         interpreter = open_exec(interpreter_name);
 266                         retval = PTR_ERR(interpreter);
 267                         if (IS_ERR(interpreter)) {
 268                                 interpreter = NULL;
 269                                 goto error;
 270                         }
 271
 272                         /*
 273                          * If the binary is not readable then enforce
 274                          * mm->dumpable = 0 regardless of the interpreter's
 275                          * permissions.
 276                          */
 277                         would_dump(bprm, interpreter);
 278
 279                         retval = kernel_read(interpreter, 0, bprm->buf,
 280                                              BINPRM_BUF_SIZE);
 281                         if (unlikely(retval != BINPRM_BUF_SIZE)) {
 282                                 if (retval >= 0)
 283                                         retval = -ENOEXEC;
 284                                 goto error;
 285                         }
 286
 287                         interp_params.hdr = *((struct elfhdr *) bprm->buf);
 288                         break;
 289
 290                 case PT_LOAD:
 291 #ifdef CONFIG_MMU
 292                         if (exec_params.load_addr == 0)
 293                                 exec_params.load_addr = phdr->p_vaddr;
 294 #endif
 295                         break;
 296                 }
 297
 298         }
 299
 300         if (is_constdisp(&exec_params.hdr))
 301                 exec_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
 302
 303         /* perform insanity checks on the interpreter */
 304         if (interpreter_name) {
 305                 retval = -ELIBBAD;
 306                 if (!is_elf(&interp_params.hdr, interpreter))
 307                         goto error;
 308
 309                 interp_params.flags = ELF_FDPIC_FLAG_PRESENT;
 310
 311                 /* read the interpreter's program header table */
 312                 retval = elf_fdpic_fetch_phdrs(&interp_params, interpreter);
 313                 if (retval < 0)
 314                         goto error;
 315         }
 316
 317         stack_size = exec_params.stack_size;
 318         if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
 319                 executable_stack = EXSTACK_ENABLE_X;
 320         else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
 321                 executable_stack = EXSTACK_DISABLE_X;
 322         else
 323                 executable_stack = EXSTACK_DEFAULT;
 324
 325         if (stack_size == 0) {
 326                 stack_size = interp_params.stack_size;
 327                 if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
 328                         executable_stack = EXSTACK_ENABLE_X;
 329                 else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
 330                         executable_stack = EXSTACK_DISABLE_X;
 331                 else
 332                         executable_stack = EXSTACK_DEFAULT;
 333         }
 334
 335         retval = -ENOEXEC;
 336         if (stack_size == 0)
 337                 stack_size = 131072UL; /* same as exec.c's default commit */
 338
 339         if (is_constdisp(&interp_params.hdr))
 340                 interp_params.flags |= ELF_FDPIC_FLAG_CONSTDISP;
 341
 342         /* flush all traces of the currently running executable */
 343         retval = flush_old_exec(bprm);
 344         if (retval)
 345                 goto error;
 346
 347         /* there's now no turning back... the old userspace image is dead,
 348          * defunct, deceased, etc.
 349          */
 350         if (elf_check_fdpic(&exec_params.hdr))
 351                 set_personality(PER_LINUX_FDPIC);
 352         else
 353                 set_personality(PER_LINUX);
 354         if (elf_read_implies_exec(&exec_params.hdr, executable_stack))
 355                 current->personality |= READ_IMPLIES_EXEC;
 356
 357         setup_new_exec(bprm);
 358
 359         set_binfmt(&elf_fdpic_format);
 360
 361         current->mm->start_code = 0;
 362         current->mm->end_code = 0;
 363         current->mm->start_stack = 0;
 364         current->mm->start_data = 0;
 365         current->mm->end_data = 0;
 366         current->mm->context.exec_fdpic_loadmap = 0;
 367         current->mm->context.interp_fdpic_loadmap = 0;
 368
 369 #ifdef CONFIG_MMU
 370         elf_fdpic_arch_lay_out_mm(&exec_params,
 371                                   &interp_params,
 372                                   &current->mm->start_stack,
 373                                   &current->mm->start_brk);
 374
 375         retval = setup_arg_pages(bprm, current->mm->start_stack,
 376                                  executable_stack);
 377         if (retval < 0)
 378                 goto error;
 379 #endif
 380
 381         /* load the executable and interpreter into memory */
 382         retval = elf_fdpic_map_file(&exec_params, bprm->file, current->mm,
 383                                     "executable");
 384         if (retval < 0)
 385                 goto error;
 386
 387         if (interpreter_name) {
 388                 retval = elf_fdpic_map_file(&interp_params, interpreter,
 389                                             current->mm, "interpreter");
 390                 if (retval < 0) {
 391                         printk(KERN_ERR "Unable to load interpreter\n");
 392                         goto error;
 393                 }
 394
 395                 allow_write_access(interpreter);
 396                 fput(interpreter);
 397                 interpreter = NULL;
 398         }
 399
 400 #ifdef CONFIG_MMU
 401         if (!current->mm->start_brk)
 402                 current->mm->start_brk = current->mm->end_data;
 403
 404         current->mm->brk = current->mm->start_brk =
 405                 PAGE_ALIGN(current->mm->start_brk);
 406
 407 #else
 408         /* create a stack area and zero-size brk area */
 409         stack_size = (stack_size + PAGE_SIZE - 1) & PAGE_MASK;
 410         if (stack_size < PAGE_SIZE * 2)
 411                 stack_size = PAGE_SIZE * 2;
 412
 413         stack_prot = PROT_READ | PROT_WRITE;
 414         if (executable_stack == EXSTACK_ENABLE_X ||
 415             (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC))
 416                 stack_prot |= PROT_EXEC;
 417
 418         current->mm->start_brk = vm_mmap(NULL, 0, stack_size, stack_prot,
 419                                          MAP_PRIVATE | MAP_ANONYMOUS |
 420                                          MAP_UNINITIALIZED | MAP_GROWSDOWN,
 421                                          0);
 422
 423         if (IS_ERR_VALUE(current->mm->start_brk)) {
 424                 retval = current->mm->start_brk;
 425                 current->mm->start_brk = 0;
 426                 goto error;
 427         }
 428
 429         current->mm->brk = current->mm->start_brk;
 430         current->mm->context.end_brk = current->mm->start_brk;
 431         current->mm->start_stack = current->mm->start_brk + stack_size;
 432 #endif
 433
 434         install_exec_creds(bprm);
 435         if (create_elf_fdpic_tables(bprm, current->mm,
 436                                     &exec_params, &interp_params) < 0)
 437                 goto error;
 438
 439         kdebug("- start_code  %lx", current->mm->start_code);
 440         kdebug("- end_code    %lx", current->mm->end_code);
 441         kdebug("- start_data  %lx", current->mm->start_data);
 442         kdebug("- end_data    %lx", current->mm->end_data);
 443         kdebug("- start_brk   %lx", current->mm->start_brk);
 444         kdebug("- brk         %lx", current->mm->brk);
 445         kdebug("- start_stack %lx", current->mm->start_stack);
 446
 447 #ifdef ELF_FDPIC_PLAT_INIT
 448         /*
 449          * The ABI may specify that certain registers be set up in special
 450          * ways (on i386 %edx is the address of a DT_FINI function, for
 451          * example.  This macro performs whatever initialization to
 452          * the regs structure is required.
 453          */
 454         dynaddr = interp_params.dynamic_addr ?: exec_params.dynamic_addr;
 455         ELF_FDPIC_PLAT_INIT(regs, exec_params.map_addr, interp_params.map_addr,
 456                             dynaddr);
 457 #endif
 458
 459         /* everything is now ready... get the userspace context ready to roll */
 460         entryaddr = interp_params.entry_addr ?: exec_params.entry_addr;
 461         start_thread(regs, entryaddr, current->mm->start_stack);
 462
 463         retval = 0;
 464
 465 error:
 466         if (interpreter) {
 467                 allow_write_access(interpreter);
 468                 fput(interpreter);
 469         }
 470         kfree(interpreter_name);
 471         kfree(exec_params.phdrs);
 472         kfree(exec_params.loadmap);
 473         kfree(interp_params.phdrs);
 474         kfree(interp_params.loadmap);
 475         return retval;
 476 }
 477
 478 /*****************************************************************************/
 479
 480 #ifndef ELF_BASE_PLATFORM
 481 /*
 482  * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
 483  * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
 484  * will be copied to the user stack in the same manner as AT_PLATFORM.
 485  */
 486 #define ELF_BASE_PLATFORM NULL
 487 #endif
 488
 489 /*
 490  * present useful information to the program by shovelling it onto the new
 491  * process's stack
 492  */
 493 static int create_elf_fdpic_tables(struct linux_binprm *bprm,
 494                                    struct mm_struct *mm,
 495                                    struct elf_fdpic_params *exec_params,
 496                                    struct elf_fdpic_params *interp_params)
 497 {
 498         const struct cred *cred = current_cred();
 499         unsigned long sp, csp, nitems;
 500         elf_caddr_t __user *argv, *envp;
 501         size_t platform_len = 0, len;
 502         char *k_platform, *k_base_platform;
 503         char __user *u_platform, *u_base_platform, *p;
 504         int loop;
 505         int nr; /* reset for each csp adjustment */
 506
 507 #ifdef CONFIG_MMU
 508         /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions
 509          * by the processes running on the same package. One thing we can do is
 510          * to shuffle the initial stack for them, so we give the architecture
 511          * an opportunity to do so here.
 512          */
 513         sp = arch_align_stack(bprm->p);
 514 #else
 515         sp = mm->start_stack;
 516
 517         /* stack the program arguments and environment */
 518         if (elf_fdpic_transfer_args_to_stack(bprm, &sp) < 0)
 519                 return -EFAULT;
 520 #endif
 521
 522         /*
 523          * If this architecture has a platform capability string, copy it
 524          * to userspace.  In some cases (Sparc), this info is impossible
 525          * for userspace to get any other way, in others (i386) it is
 526          * merely difficult.
 527          */
 528         k_platform = ELF_PLATFORM;
 529         u_platform = NULL;
 530
 531         if (k_platform) {
 532                 platform_len = strlen(k_platform) + 1;
 533                 sp -= platform_len;
 534                 u_platform = (char __user *) sp;
 535                 if (__copy_to_user(u_platform, k_platform, platform_len) != 0)
 536                         return -EFAULT;
 537         }
 538
 539         /*
 540          * If this architecture has a "base" platform capability
 541          * string, copy it to userspace.
 542          */
 543         k_base_platform = ELF_BASE_PLATFORM;
 544         u_base_platform = NULL;
 545
 546         if (k_base_platform) {
 547                 platform_len = strlen(k_base_platform) + 1;
 548                 sp -= platform_len;
 549                 u_base_platform = (char __user *) sp;
 550                 if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0)
 551                         return -EFAULT;
 552         }
 553
 554         sp &= ~7UL;
 555
 556         /* stack the load map(s) */
 557         len = sizeof(struct elf32_fdpic_loadmap);
 558         len += sizeof(struct elf32_fdpic_loadseg) * exec_params->loadmap->nsegs;
 559         sp = (sp - len) & ~7UL;
 560         exec_params->map_addr = sp;
 561
 562         if (copy_to_user((void __user *) sp, exec_params->loadmap, len) != 0)
 563                 return -EFAULT;
 564
 565         current->mm->context.exec_fdpic_loadmap = (unsigned long) sp;
 566
 567         if (interp_params->loadmap) {
 568                 len = sizeof(struct elf32_fdpic_loadmap);
 569                 len += sizeof(struct elf32_fdpic_loadseg) *
 570                         interp_params->loadmap->nsegs;
 571                 sp = (sp - len) & ~7UL;
 572                 interp_params->map_addr = sp;
 573
 574                 if (copy_to_user((void __user *) sp, interp_params->loadmap,
 575                                  len) != 0)
 576                         return -EFAULT;
 577
 578                 current->mm->context.interp_fdpic_loadmap = (unsigned long) sp;
 579         }
 580
 581         /* force 16 byte _final_ alignment here for generality */
 582 #define DLINFO_ITEMS 15
 583
 584         nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) +
 585                 (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH;
 586
 587         if (bprm->interp_flags & BINPRM_FLAGS_EXECFD)
 588                 nitems++;
 589
 590         csp = sp;
 591         sp -= nitems * 2 * sizeof(unsigned long);
 592         sp -= (bprm->envc + 1) * sizeof(char *);        /* envv[] */
 593         sp -= (bprm->argc + 1) * sizeof(char *);        /* argv[] */
 594         sp -= 1 * sizeof(unsigned long);                /* argc */
 595
 596         csp -= sp & 15UL;
 597         sp -= sp & 15UL;
 598
 599         /* put the ELF interpreter info on the stack */
 600 #define NEW_AUX_ENT(id, val)                                            \
 601         do {                                                            \
 602                 struct { unsigned long _id, _val; } __user *ent;        \
 603                                                                         \
 604                 ent = (void __user *) csp;                              \
 605                 __put_user((id), &ent[nr]._id);                         \
 606                 __put_user((val), &ent[nr]._val);                       \
 607                 nr++;                                                   \
 608         } while (0)
 609
 610         nr = 0;
 611         csp -= 2 * sizeof(unsigned long);
 612         NEW_AUX_ENT(AT_NULL, 0);
 613         if (k_platform) {
 614                 nr = 0;
 615                 csp -= 2 * sizeof(unsigned long);
 616                 NEW_AUX_ENT(AT_PLATFORM,
 617                             (elf_addr_t) (unsigned long) u_platform);
 618         }
 619
 620         if (k_base_platform) {
 621                 nr = 0;
 622                 csp -= 2 * sizeof(unsigned long);
 623                 NEW_AUX_ENT(AT_BASE_PLATFORM,
 624                             (elf_addr_t) (unsigned long) u_base_platform);
 625         }
 626
 627         if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
 628                 nr = 0;
 629                 csp -= 2 * sizeof(unsigned long);
 630                 NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
 631         }
 632
 633         nr = 0;
 634         csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long);
 635         NEW_AUX_ENT(AT_HWCAP,   ELF_HWCAP);
 636 #ifdef ELF_HWCAP2
 637         NEW_AUX_ENT(AT_HWCAP2,  ELF_HWCAP2);
 638 #endif
 639         NEW_AUX_ENT(AT_PAGESZ,  PAGE_SIZE);
 640         NEW_AUX_ENT(AT_CLKTCK,  CLOCKS_PER_SEC);
 641         NEW_AUX_ENT(AT_PHDR,    exec_params->ph_addr);
 642         NEW_AUX_ENT(AT_PHENT,   sizeof(struct elf_phdr));
 643         NEW_AUX_ENT(AT_PHNUM,   exec_params->hdr.e_phnum);
 644         NEW_AUX_ENT(AT_BASE,    interp_params->elfhdr_addr);
 645         NEW_AUX_ENT(AT_FLAGS,   0);
 646         NEW_AUX_ENT(AT_ENTRY,   exec_params->entry_addr);
 647         NEW_AUX_ENT(AT_UID,     (elf_addr_t) from_kuid_munged(cred->user_ns, cred->uid));
 648         NEW_AUX_ENT(AT_EUID,    (elf_addr_t) from_kuid_munged(cred->user_ns, cred->euid));
 649         NEW_AUX_ENT(AT_GID,     (elf_addr_t) from_kgid_munged(cred->user_ns, cred->gid));
 650         NEW_AUX_ENT(AT_EGID,    (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid));
 651         NEW_AUX_ENT(AT_SECURE,  security_bprm_secureexec(bprm));
 652         NEW_AUX_ENT(AT_EXECFN,  bprm->exec);
 653
 654 #ifdef ARCH_DLINFO
 655         nr = 0;
 656         csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long);
 657
 658         /* ARCH_DLINFO must come last so platform specific code can enforce
 659          * special alignment requirements on the AUXV if necessary (eg. PPC).
 660          */
 661         ARCH_DLINFO;
 662 #endif
 663 #undef NEW_AUX_ENT
 664
 665         /* allocate room for argv[] and envv[] */
 666         csp -= (bprm->envc + 1) * sizeof(elf_caddr_t);
 667         envp = (elf_caddr_t __user *) csp;
 668         csp -= (bprm->argc + 1) * sizeof(elf_caddr_t);
 669         argv = (elf_caddr_t __user *) csp;
 670
 671         /* stack argc */
 672         csp -= sizeof(unsigned long);
 673         __put_user(bprm->argc, (unsigned long __user *) csp);
 674
 675         BUG_ON(csp != sp);
 676
 677         /* fill in the argv[] array */
 678 #ifdef CONFIG_MMU
 679         current->mm->arg_start = bprm->p;
 680 #else
 681         current->mm->arg_start = current->mm->start_stack -
 682                 (MAX_ARG_PAGES * PAGE_SIZE - bprm->p);
 683 #endif
 684
 685         p = (char __user *) current->mm->arg_start;
 686         for (loop = bprm->argc; loop > 0; loop--) {
 687                 __put_user((elf_caddr_t) p, argv++);
 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, argv);
 694         current->mm->arg_end = (unsigned long) p;
 695
 696         /* fill in the envv[] array */
 697         current->mm->env_start = (unsigned long) p;
 698         for (loop = bprm->envc; loop > 0; loop--) {
 699                 __put_user((elf_caddr_t)(unsigned long) p, envp++);
 700                 len = strnlen_user(p, MAX_ARG_STRLEN);
 701                 if (!len || len > MAX_ARG_STRLEN)
 702                         return -EINVAL;
 703                 p += len;
 704         }
 705         __put_user(NULL, envp);
 706         current->mm->env_end = (unsigned long) p;
 707
 708         mm->start_stack = (unsigned long) sp;
 709         return 0;
 710 }
 711
 712 /*****************************************************************************/
 713 /*
 714  * transfer the program arguments and environment from the holding pages onto
 715  * the stack
 716  */
 717 #ifndef CONFIG_MMU
 718 static int elf_fdpic_transfer_args_to_stack(struct linux_binprm *bprm,
 719                                             unsigned long *_sp)
 720 {
 721         unsigned long index, stop, sp;
 722         char *src;
 723         int ret = 0;
 724
 725         stop = bprm->p >> PAGE_SHIFT;
 726         sp = *_sp;
 727
 728         for (index = MAX_ARG_PAGES - 1; index >= stop; index--) {
 729                 src = kmap(bprm->page[index]);
 730                 sp -= PAGE_SIZE;
 731                 if (copy_to_user((void *) sp, src, PAGE_SIZE) != 0)
 732                         ret = -EFAULT;
 733                 kunmap(bprm->page[index]);
 734                 if (ret < 0)
 735                         goto out;
 736         }
 737
 738         *_sp = (*_sp - (MAX_ARG_PAGES * PAGE_SIZE - bprm->p)) & ~15;
 739
 740 out:
 741         return ret;
 742 }
 743 #endif
 744
 745 /*****************************************************************************/
 746 /*
 747  * load the appropriate binary image (executable or interpreter) into memory
 748  * - we assume no MMU is available
 749  * - if no other PIC bits are set in params->hdr->e_flags
 750  *   - we assume that the LOADable segments in the binary are independently relocatable
 751  *   - we assume R/O executable segments are shareable
 752  * - else
 753  *   - we assume the loadable parts of the image to require fixed displacement
 754  *   - the image is not shareable
 755  */
 756 static int elf_fdpic_map_file(struct elf_fdpic_params *params,
 757                               struct file *file,
 758                               struct mm_struct *mm,
 759                               const char *what)
 760 {
 761         struct elf32_fdpic_loadmap *loadmap;
 762 #ifdef CONFIG_MMU
 763         struct elf32_fdpic_loadseg *mseg;
 764 #endif
 765         struct elf32_fdpic_loadseg *seg;
 766         struct elf32_phdr *phdr;
 767         unsigned long load_addr, stop;
 768         unsigned nloads, tmp;
 769         size_t size;
 770         int loop, ret;
 771
 772         /* allocate a load map table */
 773         nloads = 0;
 774         for (loop = 0; loop < params->hdr.e_phnum; loop++)
 775                 if (params->phdrs[loop].p_type == PT_LOAD)
 776                         nloads++;
 777
 778         if (nloads == 0)
 779                 return -ELIBBAD;
 780
 781         size = sizeof(*loadmap) + nloads * sizeof(*seg);
 782         loadmap = kzalloc(size, GFP_KERNEL);
 783         if (!loadmap)
 784                 return -ENOMEM;
 785
 786         params->loadmap = loadmap;
 787
 788         loadmap->version = ELF32_FDPIC_LOADMAP_VERSION;
 789         loadmap->nsegs = nloads;
 790
 791         load_addr = params->load_addr;
 792         seg = loadmap->segs;
 793
 794         /* map the requested LOADs into the memory space */
 795         switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
 796         case ELF_FDPIC_FLAG_CONSTDISP:
 797         case ELF_FDPIC_FLAG_CONTIGUOUS:
 798 #ifndef CONFIG_MMU
 799                 ret = elf_fdpic_map_file_constdisp_on_uclinux(params, file, mm);
 800                 if (ret < 0)
 801                         return ret;
 802                 break;
 803 #endif
 804         default:
 805                 ret = elf_fdpic_map_file_by_direct_mmap(params, file, mm);
 806                 if (ret < 0)
 807                         return ret;
 808                 break;
 809         }
 810
 811         /* map the entry point */
 812         if (params->hdr.e_entry) {
 813                 seg = loadmap->segs;
 814                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
 815                         if (params->hdr.e_entry >= seg->p_vaddr &&
 816                             params->hdr.e_entry < seg->p_vaddr + seg->p_memsz) {
 817                                 params->entry_addr =
 818                                         (params->hdr.e_entry - seg->p_vaddr) +
 819                                         seg->addr;
 820                                 break;
 821                         }
 822                 }
 823         }
 824
 825         /* determine where the program header table has wound up if mapped */
 826         stop = params->hdr.e_phoff;
 827         stop += params->hdr.e_phnum * sizeof (struct elf_phdr);
 828         phdr = params->phdrs;
 829
 830         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 831                 if (phdr->p_type != PT_LOAD)
 832                         continue;
 833
 834                 if (phdr->p_offset > params->hdr.e_phoff ||
 835                     phdr->p_offset + phdr->p_filesz < stop)
 836                         continue;
 837
 838                 seg = loadmap->segs;
 839                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
 840                         if (phdr->p_vaddr >= seg->p_vaddr &&
 841                             phdr->p_vaddr + phdr->p_filesz <=
 842                             seg->p_vaddr + seg->p_memsz) {
 843                                 params->ph_addr =
 844                                         (phdr->p_vaddr - seg->p_vaddr) +
 845                                         seg->addr +
 846                                         params->hdr.e_phoff - phdr->p_offset;
 847                                 break;
 848                         }
 849                 }
 850                 break;
 851         }
 852
 853         /* determine where the dynamic section has wound up if there is one */
 854         phdr = params->phdrs;
 855         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 856                 if (phdr->p_type != PT_DYNAMIC)
 857                         continue;
 858
 859                 seg = loadmap->segs;
 860                 for (loop = loadmap->nsegs; loop > 0; loop--, seg++) {
 861                         if (phdr->p_vaddr >= seg->p_vaddr &&
 862                             phdr->p_vaddr + phdr->p_memsz <=
 863                             seg->p_vaddr + seg->p_memsz) {
 864                                 params->dynamic_addr =
 865                                         (phdr->p_vaddr - seg->p_vaddr) +
 866                                         seg->addr;
 867
 868                                 /* check the dynamic section contains at least
 869                                  * one item, and that the last item is a NULL
 870                                  * entry */
 871                                 if (phdr->p_memsz == 0 ||
 872                                     phdr->p_memsz % sizeof(Elf32_Dyn) != 0)
 873                                         goto dynamic_error;
 874
 875                                 tmp = phdr->p_memsz / sizeof(Elf32_Dyn);
 876                                 if (((Elf32_Dyn *)
 877                                      params->dynamic_addr)[tmp - 1].d_tag != 0)
 878                                         goto dynamic_error;
 879                                 break;
 880                         }
 881                 }
 882                 break;
 883         }
 884
 885         /* now elide adjacent segments in the load map on MMU linux
 886          * - on uClinux the holes between may actually be filled with system
 887          *   stuff or stuff from other processes
 888          */
 889 #ifdef CONFIG_MMU
 890         nloads = loadmap->nsegs;
 891         mseg = loadmap->segs;
 892         seg = mseg + 1;
 893         for (loop = 1; loop < nloads; loop++) {
 894                 /* see if we have a candidate for merging */
 895                 if (seg->p_vaddr - mseg->p_vaddr == seg->addr - mseg->addr) {
 896                         load_addr = PAGE_ALIGN(mseg->addr + mseg->p_memsz);
 897                         if (load_addr == (seg->addr & PAGE_MASK)) {
 898                                 mseg->p_memsz +=
 899                                         load_addr -
 900                                         (mseg->addr + mseg->p_memsz);
 901                                 mseg->p_memsz += seg->addr & ~PAGE_MASK;
 902                                 mseg->p_memsz += seg->p_memsz;
 903                                 loadmap->nsegs--;
 904                                 continue;
 905                         }
 906                 }
 907
 908                 mseg++;
 909                 if (mseg != seg)
 910                         *mseg = *seg;
 911         }
 912 #endif
 913
 914         kdebug("Mapped Object [%s]:", what);
 915         kdebug("- elfhdr   : %lx", params->elfhdr_addr);
 916         kdebug("- entry    : %lx", params->entry_addr);
 917         kdebug("- PHDR[]   : %lx", params->ph_addr);
 918         kdebug("- DYNAMIC[]: %lx", params->dynamic_addr);
 919         seg = loadmap->segs;
 920         for (loop = 0; loop < loadmap->nsegs; loop++, seg++)
 921                 kdebug("- LOAD[%d] : %08x-%08x [va=%x ms=%x]",
 922                        loop,
 923                        seg->addr, seg->addr + seg->p_memsz - 1,
 924                        seg->p_vaddr, seg->p_memsz);
 925
 926         return 0;
 927
 928 dynamic_error:
 929         printk("ELF FDPIC %s with invalid DYNAMIC section (inode=%lu)\n",
 930                what, file_inode(file)->i_ino);
 931         return -ELIBBAD;
 932 }
 933
 934 /*****************************************************************************/
 935 /*
 936  * map a file with constant displacement under uClinux
 937  */
 938 #ifndef CONFIG_MMU
 939 static int elf_fdpic_map_file_constdisp_on_uclinux(
 940         struct elf_fdpic_params *params,
 941         struct file *file,
 942         struct mm_struct *mm)
 943 {
 944         struct elf32_fdpic_loadseg *seg;
 945         struct elf32_phdr *phdr;
 946         unsigned long load_addr, base = ULONG_MAX, top = 0, maddr = 0, mflags;
 947         int loop, ret;
 948
 949         load_addr = params->load_addr;
 950         seg = params->loadmap->segs;
 951
 952         /* determine the bounds of the contiguous overall allocation we must
 953          * make */
 954         phdr = params->phdrs;
 955         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 956                 if (params->phdrs[loop].p_type != PT_LOAD)
 957                         continue;
 958
 959                 if (base > phdr->p_vaddr)
 960                         base = phdr->p_vaddr;
 961                 if (top < phdr->p_vaddr + phdr->p_memsz)
 962                         top = phdr->p_vaddr + phdr->p_memsz;
 963         }
 964
 965         /* allocate one big anon block for everything */
 966         mflags = MAP_PRIVATE;
 967         if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
 968                 mflags |= MAP_EXECUTABLE;
 969
 970         maddr = vm_mmap(NULL, load_addr, top - base,
 971                         PROT_READ | PROT_WRITE | PROT_EXEC, mflags, 0);
 972         if (IS_ERR_VALUE(maddr))
 973                 return (int) maddr;
 974
 975         if (load_addr != 0)
 976                 load_addr += PAGE_ALIGN(top - base);
 977
 978         /* and then load the file segments into it */
 979         phdr = params->phdrs;
 980         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
 981                 if (params->phdrs[loop].p_type != PT_LOAD)
 982                         continue;
 983
 984                 seg->addr = maddr + (phdr->p_vaddr - base);
 985                 seg->p_vaddr = phdr->p_vaddr;
 986                 seg->p_memsz = phdr->p_memsz;
 987
 988                 ret = read_code(file, seg->addr, phdr->p_offset,
 989                                        phdr->p_filesz);
 990                 if (ret < 0)
 991                         return ret;
 992
 993                 /* map the ELF header address if in this segment */
 994                 if (phdr->p_offset == 0)
 995                         params->elfhdr_addr = seg->addr;
 996
 997                 /* clear any space allocated but not loaded */
 998                 if (phdr->p_filesz < phdr->p_memsz) {
 999                         if (clear_user((void *) (seg->addr + phdr->p_filesz),
1000                                        phdr->p_memsz - phdr->p_filesz))
1001                                 return -EFAULT;
1002                 }
1003
1004                 if (mm) {
1005                         if (phdr->p_flags & PF_X) {
1006                                 if (!mm->start_code) {
1007                                         mm->start_code = seg->addr;
1008                                         mm->end_code = seg->addr +
1009                                                 phdr->p_memsz;
1010                                 }
1011                         } else if (!mm->start_data) {
1012                                 mm->start_data = seg->addr;
1013                                 mm->end_data = seg->addr + phdr->p_memsz;
1014                         }
1015                 }
1016
1017                 seg++;
1018         }
1019
1020         return 0;
1021 }
1022 #endif
1023
1024 /*****************************************************************************/
1025 /*
1026  * map a binary by direct mmap() of the individual PT_LOAD segments
1027  */
1028 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
1029                                              struct file *file,
1030                                              struct mm_struct *mm)
1031 {
1032         struct elf32_fdpic_loadseg *seg;
1033         struct elf32_phdr *phdr;
1034         unsigned long load_addr, delta_vaddr;
1035         int loop, dvset;
1036
1037         load_addr = params->load_addr;
1038         delta_vaddr = 0;
1039         dvset = 0;
1040
1041         seg = params->loadmap->segs;
1042
1043         /* deal with each load segment separately */
1044         phdr = params->phdrs;
1045         for (loop = 0; loop < params->hdr.e_phnum; loop++, phdr++) {
1046                 unsigned long maddr, disp, excess, excess1;
1047                 int prot = 0, flags;
1048
1049                 if (phdr->p_type != PT_LOAD)
1050                         continue;
1051
1052                 kdebug("[LOAD] va=%lx of=%lx fs=%lx ms=%lx",
1053                        (unsigned long) phdr->p_vaddr,
1054                        (unsigned long) phdr->p_offset,
1055                        (unsigned long) phdr->p_filesz,
1056                        (unsigned long) phdr->p_memsz);
1057
1058                 /* determine the mapping parameters */
1059                 if (phdr->p_flags & PF_R) prot |= PROT_READ;
1060                 if (phdr->p_flags & PF_W) prot |= PROT_WRITE;
1061                 if (phdr->p_flags & PF_X) prot |= PROT_EXEC;
1062
1063                 flags = MAP_PRIVATE | MAP_DENYWRITE;
1064                 if (params->flags & ELF_FDPIC_FLAG_EXECUTABLE)
1065                         flags |= MAP_EXECUTABLE;
1066
1067                 maddr = 0;
1068
1069                 switch (params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) {
1070                 case ELF_FDPIC_FLAG_INDEPENDENT:
1071                         /* PT_LOADs are independently locatable */
1072                         break;
1073
1074                 case ELF_FDPIC_FLAG_HONOURVADDR:
1075                         /* the specified virtual address must be honoured */
1076                         maddr = phdr->p_vaddr;
1077                         flags |= MAP_FIXED;
1078                         break;
1079
1080                 case ELF_FDPIC_FLAG_CONSTDISP:
1081                         /* constant displacement
1082                          * - can be mapped anywhere, but must be mapped as a
1083                          *   unit
1084                          */
1085                         if (!dvset) {
1086                                 maddr = load_addr;
1087                                 delta_vaddr = phdr->p_vaddr;
1088                                 dvset = 1;
1089                         } else {
1090                                 maddr = load_addr + phdr->p_vaddr - delta_vaddr;
1091                                 flags |= MAP_FIXED;
1092                         }
1093                         break;
1094
1095                 case ELF_FDPIC_FLAG_CONTIGUOUS:
1096                         /* contiguity handled later */
1097                         break;
1098
1099                 default:
1100                         BUG();
1101                 }
1102
1103                 maddr &= PAGE_MASK;
1104
1105                 /* create the mapping */
1106                 disp = phdr->p_vaddr & ~PAGE_MASK;
1107                 maddr = vm_mmap(file, maddr, phdr->p_memsz + disp, prot, flags,
1108                                 phdr->p_offset - disp);
1109
1110                 kdebug("mmap[%d] <file> sz=%lx pr=%x fl=%x of=%lx --> %08lx",
1111                        loop, phdr->p_memsz + disp, prot, flags,
1112                        phdr->p_offset - disp, maddr);
1113
1114                 if (IS_ERR_VALUE(maddr))
1115                         return (int) maddr;
1116
1117                 if ((params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) ==
1118                     ELF_FDPIC_FLAG_CONTIGUOUS)
1119                         load_addr += PAGE_ALIGN(phdr->p_memsz + disp);
1120
1121                 seg->addr = maddr + disp;
1122                 seg->p_vaddr = phdr->p_vaddr;
1123                 seg->p_memsz = phdr->p_memsz;
1124
1125                 /* map the ELF header address if in this segment */
1126                 if (phdr->p_offset == 0)
1127                         params->elfhdr_addr = seg->addr;
1128
1129                 /* clear the bit between beginning of mapping and beginning of
1130                  * PT_LOAD */
1131                 if (prot & PROT_WRITE && disp > 0) {
1132                         kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp);
1133                         if (clear_user((void __user *) maddr, disp))
1134                                 return -EFAULT;
1135                         maddr += disp;
1136                 }
1137
1138                 /* clear any space allocated but not loaded
1139                  * - on uClinux we can just clear the lot
1140                  * - on MMU linux we'll get a SIGBUS beyond the last page
1141                  *   extant in the file
1142                  */
1143                 excess = phdr->p_memsz - phdr->p_filesz;
1144                 excess1 = PAGE_SIZE - ((maddr + phdr->p_filesz) & ~PAGE_MASK);
1145
1146 #ifdef CONFIG_MMU
1147                 if (excess > excess1) {
1148                         unsigned long xaddr = maddr + phdr->p_filesz + excess1;
1149                         unsigned long xmaddr;
1150
1151                         flags |= MAP_FIXED | MAP_ANONYMOUS;
1152                         xmaddr = vm_mmap(NULL, xaddr, excess - excess1,
1153                                          prot, flags, 0);
1154
1155                         kdebug("mmap[%d] <anon>"
1156                                " ad=%lx sz=%lx pr=%x fl=%x of=0 --> %08lx",
1157                                loop, xaddr, excess - excess1, prot, flags,
1158                                xmaddr);
1159
1160                         if (xmaddr != xaddr)
1161                                 return -ENOMEM;
1162                 }
1163
1164                 if (prot & PROT_WRITE && excess1 > 0) {
1165                         kdebug("clear[%d] ad=%lx sz=%lx",
1166                                loop, maddr + phdr->p_filesz, excess1);
1167                         if (clear_user((void __user *) maddr + phdr->p_filesz,
1168                                        excess1))
1169                                 return -EFAULT;
1170                 }
1171
1172 #else
1173                 if (excess > 0) {
1174                         kdebug("clear[%d] ad=%lx sz=%lx",
1175                                loop, maddr + phdr->p_filesz, excess);
1176                         if (clear_user((void *) maddr + phdr->p_filesz, excess))
1177                                 return -EFAULT;
1178                 }
1179 #endif
1180
1181                 if (mm) {
1182                         if (phdr->p_flags & PF_X) {
1183                                 if (!mm->start_code) {
1184                                         mm->start_code = maddr;
1185                                         mm->end_code = maddr + phdr->p_memsz;
1186                                 }
1187                         } else if (!mm->start_data) {
1188                                 mm->start_data = maddr;
1189                                 mm->end_data = maddr + phdr->p_memsz;
1190                         }
1191                 }
1192
1193                 seg++;
1194         }
1195
1196         return 0;
1197 }
1198
1199 /*****************************************************************************/
1200 /*
1201  * ELF-FDPIC core dumper
1202  *
1203  * Modelled on fs/exec.c:aout_core_dump()
1204  * Jeremy Fitzhardinge <jeremy@sw.oz.au>
1205  *
1206  * Modelled on fs/binfmt_elf.c core dumper
1207  */
1208 #ifdef CONFIG_ELF_CORE
1209
1210 /*
1211  * Decide whether a segment is worth dumping; default is yes to be
1212  * sure (missing info is worse than too much; etc).
1213  * Personally I'd include everything, and use the coredump limit...
1214  *
1215  * I think we should skip something. But I am not sure how. H.J.
1216  */
1217 static int maydump(struct vm_area_struct *vma, unsigned long mm_flags)
1218 {
1219         int dump_ok;
1220
1221         /* Do not dump I/O mapped devices or special mappings */
1222         if (vma->vm_flags & VM_IO) {
1223                 kdcore("%08lx: %08lx: no (IO)", vma->vm_start, vma->vm_flags);
1224                 return 0;
1225         }
1226
1227         /* If we may not read the contents, don't allow us to dump
1228          * them either. "dump_write()" can't handle it anyway.
1229          */
1230         if (!(vma->vm_flags & VM_READ)) {
1231                 kdcore("%08lx: %08lx: no (!read)", vma->vm_start, vma->vm_flags);
1232                 return 0;
1233         }
1234
1235         /* support for DAX */
1236         if (vma_is_dax(vma)) {
1237                 if (vma->vm_flags & VM_SHARED) {
1238                         dump_ok = test_bit(MMF_DUMP_DAX_SHARED, &mm_flags);
1239                         kdcore("%08lx: %08lx: %s (DAX shared)", vma->vm_start,
1240                                vma->vm_flags, dump_ok ? "yes" : "no");
1241                 } else {
1242                         dump_ok = test_bit(MMF_DUMP_DAX_PRIVATE, &mm_flags);
1243                         kdcore("%08lx: %08lx: %s (DAX private)", vma->vm_start,
1244                                vma->vm_flags, dump_ok ? "yes" : "no");
1245                 }
1246                 return dump_ok;
1247         }
1248
1249         /* By default, dump shared memory if mapped from an anonymous file. */
1250         if (vma->vm_flags & VM_SHARED) {
1251                 if (file_inode(vma->vm_file)->i_nlink == 0) {
1252                         dump_ok = test_bit(MMF_DUMP_ANON_SHARED, &mm_flags);
1253                         kdcore("%08lx: %08lx: %s (share)", vma->vm_start,
1254                                vma->vm_flags, dump_ok ? "yes" : "no");
1255                         return dump_ok;
1256                 }
1257
1258                 dump_ok = test_bit(MMF_DUMP_MAPPED_SHARED, &mm_flags);
1259                 kdcore("%08lx: %08lx: %s (share)", vma->vm_start,
1260                        vma->vm_flags, dump_ok ? "yes" : "no");
1261                 return dump_ok;
1262         }
1263
1264 #ifdef CONFIG_MMU
1265         /* By default, if it hasn't been written to, don't write it out */
1266         if (!vma->anon_vma) {
1267                 dump_ok = test_bit(MMF_DUMP_MAPPED_PRIVATE, &mm_flags);
1268                 kdcore("%08lx: %08lx: %s (!anon)", vma->vm_start,
1269                        vma->vm_flags, dump_ok ? "yes" : "no");
1270                 return dump_ok;
1271         }
1272 #endif
1273
1274         dump_ok = test_bit(MMF_DUMP_ANON_PRIVATE, &mm_flags);
1275         kdcore("%08lx: %08lx: %s", vma->vm_start, vma->vm_flags,
1276                dump_ok ? "yes" : "no");
1277         return dump_ok;
1278 }
1279
1280 /* An ELF note in memory */
1281 struct memelfnote
1282 {
1283         const char *name;
1284         int type;
1285         unsigned int datasz;
1286         void *data;
1287 };
1288
1289 static int notesize(struct memelfnote *en)
1290 {
1291         int sz;
1292
1293         sz = sizeof(struct elf_note);
1294         sz += roundup(strlen(en->name) + 1, 4);
1295         sz += roundup(en->datasz, 4);
1296
1297         return sz;
1298 }
1299
1300 /* #define DEBUG */
1301
1302 static int writenote(struct memelfnote *men, struct coredump_params *cprm)
1303 {
1304         struct elf_note en;
1305         en.n_namesz = strlen(men->name) + 1;
1306         en.n_descsz = men->datasz;
1307         en.n_type = men->type;
1308
1309         return dump_emit(cprm, &en, sizeof(en)) &&
1310                 dump_emit(cprm, men->name, en.n_namesz) && dump_align(cprm, 4) &&
1311                 dump_emit(cprm, men->data, men->datasz) && dump_align(cprm, 4);
1312 }
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_t utime, stime;
1390
1391                 task_cputime(p, &utime, &stime);
1392                 cputime_to_timeval(utime, &prstatus->pr_utime);
1393                 cputime_to_timeval(stime, &prstatus->pr_stime);
1394         }
1395         cputime_to_timeval(p->signal->cutime, &prstatus->pr_cutime);
1396         cputime_to_timeval(p->signal->cstime, &prstatus->pr_cstime);
1397
1398         prstatus->pr_exec_fdpic_loadmap = p->mm->context.exec_fdpic_loadmap;
1399         prstatus->pr_interp_fdpic_loadmap = p->mm->context.interp_fdpic_loadmap;
1400 }
1401
1402 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
1403                        struct mm_struct *mm)
1404 {
1405         const struct cred *cred;
1406         unsigned int i, len;
1407
1408         /* first copy the parameters from user space */
1409         memset(psinfo, 0, sizeof(struct elf_prpsinfo));
1410
1411         len = mm->arg_end - mm->arg_start;
1412         if (len >= ELF_PRARGSZ)
1413                 len = ELF_PRARGSZ - 1;
1414         if (copy_from_user(&psinfo->pr_psargs,
1415                            (const char __user *) mm->arg_start, len))
1416                 return -EFAULT;
1417         for (i = 0; i < len; i++)
1418                 if (psinfo->pr_psargs[i] == 0)
1419                         psinfo->pr_psargs[i] = ' ';
1420         psinfo->pr_psargs[len] = 0;
1421
1422         rcu_read_lock();
1423         psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
1424         rcu_read_unlock();
1425         psinfo->pr_pid = task_pid_vnr(p);
1426         psinfo->pr_pgrp = task_pgrp_vnr(p);
1427         psinfo->pr_sid = task_session_vnr(p);
1428
1429         i = p->state ? ffz(~p->state) + 1 : 0;
1430         psinfo->pr_state = i;
1431         psinfo->pr_sname = (i > 5) ? '.' : "RSDTZW"[i];
1432         psinfo->pr_zomb = psinfo->pr_sname == 'Z';
1433         psinfo->pr_nice = task_nice(p);
1434         psinfo->pr_flag = p->flags;
1435         rcu_read_lock();
1436         cred = __task_cred(p);
1437         SET_UID(psinfo->pr_uid, from_kuid_munged(cred->user_ns, cred->uid));
1438         SET_GID(psinfo->pr_gid, from_kgid_munged(cred->user_ns, cred->gid));
1439         rcu_read_unlock();
1440         strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
1441
1442         return 0;
1443 }
1444
1445 /* Here is the structure in which status of each thread is captured. */
1446 struct elf_thread_status
1447 {
1448         struct list_head list;
1449         struct elf_prstatus prstatus;   /* NT_PRSTATUS */
1450         elf_fpregset_t fpu;             /* NT_PRFPREG */
1451         struct task_struct *thread;
1452 #ifdef ELF_CORE_COPY_XFPREGS
1453         elf_fpxregset_t xfpu;           /* ELF_CORE_XFPREG_TYPE */
1454 #endif
1455         struct memelfnote notes[3];
1456         int num_notes;
1457 };
1458
1459 /*
1460  * In order to add the specific thread information for the elf file format,
1461  * we need to keep a linked list of every thread's pr_status and then create
1462  * a single section for them in the final core file.
1463  */
1464 static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
1465 {
1466         struct task_struct *p = t->thread;
1467         int sz = 0;
1468
1469         t->num_notes = 0;
1470
1471         fill_prstatus(&t->prstatus, p, signr);
1472         elf_core_copy_task_regs(p, &t->prstatus.pr_reg);
1473
1474         fill_note(&t->notes[0], "CORE", NT_PRSTATUS, sizeof(t->prstatus),
1475                   &t->prstatus);
1476         t->num_notes++;
1477         sz += notesize(&t->notes[0]);
1478
1479         t->prstatus.pr_fpvalid = elf_core_copy_task_fpregs(p, NULL, &t->fpu);
1480         if (t->prstatus.pr_fpvalid) {
1481                 fill_note(&t->notes[1], "CORE", NT_PRFPREG, sizeof(t->fpu),
1482                           &t->fpu);
1483                 t->num_notes++;
1484                 sz += notesize(&t->notes[1]);
1485         }
1486
1487 #ifdef ELF_CORE_COPY_XFPREGS
1488         if (elf_core_copy_task_xfpregs(p, &t->xfpu)) {
1489                 fill_note(&t->notes[2], "LINUX", ELF_CORE_XFPREG_TYPE,
1490                           sizeof(t->xfpu), &t->xfpu);
1491                 t->num_notes++;
1492                 sz += notesize(&t->notes[2]);
1493         }
1494 #endif
1495         return sz;
1496 }
1497
1498 static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
1499                              elf_addr_t e_shoff, int segs)
1500 {
1501         elf->e_shoff = e_shoff;
1502         elf->e_shentsize = sizeof(*shdr4extnum);
1503         elf->e_shnum = 1;
1504         elf->e_shstrndx = SHN_UNDEF;
1505
1506         memset(shdr4extnum, 0, sizeof(*shdr4extnum));
1507
1508         shdr4extnum->sh_type = SHT_NULL;
1509         shdr4extnum->sh_size = elf->e_shnum;
1510         shdr4extnum->sh_link = elf->e_shstrndx;
1511         shdr4extnum->sh_info = segs;
1512 }
1513
1514 /*
1515  * dump the segments for an MMU process
1516  */
1517 static bool elf_fdpic_dump_segments(struct coredump_params *cprm)
1518 {
1519         struct vm_area_struct *vma;
1520
1521         for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1522                 unsigned long addr;
1523
1524                 if (!maydump(vma, cprm->mm_flags))
1525                         continue;
1526
1527 #ifdef CONFIG_MMU
1528                 for (addr = vma->vm_start; addr < vma->vm_end;
1529                                                         addr += PAGE_SIZE) {
1530                         bool res;
1531                         struct page *page = get_dump_page(addr);
1532                         if (page) {
1533                                 void *kaddr = kmap(page);
1534                                 res = dump_emit(cprm, kaddr, PAGE_SIZE);
1535                                 kunmap(page);
1536                                 put_page(page);
1537                         } else {
1538                                 res = dump_skip(cprm, PAGE_SIZE);
1539                         }
1540                         if (!res)
1541                                 return false;
1542                 }
1543 #else
1544                 if (!dump_emit(cprm, (void *) vma->vm_start,
1545                                 vma->vm_end - vma->vm_start))
1546                         return false;
1547 #endif
1548         }
1549         return true;
1550 }
1551
1552 static size_t elf_core_vma_data_size(unsigned long mm_flags)
1553 {
1554         struct vm_area_struct *vma;
1555         size_t size = 0;
1556
1557         for (vma = current->mm->mmap; vma; vma = vma->vm_next)
1558                 if (maydump(vma, mm_flags))
1559                         size += vma->vm_end - vma->vm_start;
1560         return size;
1561 }
1562
1563 /*
1564  * Actual dumper
1565  *
1566  * This is a two-pass process; first we find the offsets of the bits,
1567  * and then they are actually written out.  If we run out of core limit
1568  * we just truncate.
1569  */
1570 static int elf_fdpic_core_dump(struct coredump_params *cprm)
1571 {
1572 #define NUM_NOTES       6
1573         int has_dumped = 0;
1574         mm_segment_t fs;
1575         int segs;
1576         int i;
1577         struct vm_area_struct *vma;
1578         struct elfhdr *elf = NULL;
1579         loff_t offset = 0, dataoff;
1580         int numnote;
1581         struct memelfnote *notes = NULL;
1582         struct elf_prstatus *prstatus = NULL;   /* NT_PRSTATUS */
1583         struct elf_prpsinfo *psinfo = NULL;     /* NT_PRPSINFO */
1584         LIST_HEAD(thread_list);
1585         struct list_head *t;
1586         elf_fpregset_t *fpu = NULL;
1587 #ifdef ELF_CORE_COPY_XFPREGS
1588         elf_fpxregset_t *xfpu = NULL;
1589 #endif
1590         int thread_status_size = 0;
1591         elf_addr_t *auxv;
1592         struct elf_phdr *phdr4note = NULL;
1593         struct elf_shdr *shdr4extnum = NULL;
1594         Elf_Half e_phnum;
1595         elf_addr_t e_shoff;
1596         struct core_thread *ct;
1597         struct elf_thread_status *tmp;
1598
1599         /*
1600          * We no longer stop all VM operations.
1601          *
1602          * This is because those proceses that could possibly change map_count
1603          * or the mmap / vma pages are now blocked in do_exit on current
1604          * finishing this core dump.
1605          *
1606          * Only ptrace can touch these memory addresses, but it doesn't change
1607          * the map_count or the pages allocated. So no possibility of crashing
1608          * exists while dumping the mm->vm_next areas to the core file.
1609          */
1610
1611         /* alloc memory for large data structures: too large to be on stack */
1612         elf = kmalloc(sizeof(*elf), GFP_KERNEL);
1613         if (!elf)
1614                 goto cleanup;
1615         prstatus = kzalloc(sizeof(*prstatus), GFP_KERNEL);
1616         if (!prstatus)
1617                 goto cleanup;
1618         psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
1619         if (!psinfo)
1620                 goto cleanup;
1621         notes = kmalloc(NUM_NOTES * sizeof(struct memelfnote), GFP_KERNEL);
1622         if (!notes)
1623                 goto cleanup;
1624         fpu = kmalloc(sizeof(*fpu), GFP_KERNEL);
1625         if (!fpu)
1626                 goto cleanup;
1627 #ifdef ELF_CORE_COPY_XFPREGS
1628         xfpu = kmalloc(sizeof(*xfpu), GFP_KERNEL);
1629         if (!xfpu)
1630                 goto cleanup;
1631 #endif
1632
1633         for (ct = current->mm->core_state->dumper.next;
1634                                         ct; ct = ct->next) {
1635                 tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
1636                 if (!tmp)
1637                         goto cleanup;
1638
1639                 tmp->thread = ct->task;
1640                 list_add(&tmp->list, &thread_list);
1641         }
1642
1643         list_for_each(t, &thread_list) {
1644                 struct elf_thread_status *tmp;
1645                 int sz;
1646
1647                 tmp = list_entry(t, struct elf_thread_status, list);
1648                 sz = elf_dump_thread_status(cprm->siginfo->si_signo, tmp);
1649                 thread_status_size += sz;
1650         }
1651
1652         /* now collect the dump for the current */
1653         fill_prstatus(prstatus, current, cprm->siginfo->si_signo);
1654         elf_core_copy_regs(&prstatus->pr_reg, cprm->regs);
1655
1656         segs = current->mm->map_count;
1657         segs += elf_core_extra_phdrs();
1658
1659         /* for notes section */
1660         segs++;
1661
1662         /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
1663          * this, kernel supports extended numbering. Have a look at
1664          * include/linux/elf.h for further information. */
1665         e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
1666
1667         /* Set up header */
1668         fill_elf_fdpic_header(elf, e_phnum);
1669
1670         has_dumped = 1;
1671         /*
1672          * Set up the notes in similar form to SVR4 core dumps made
1673          * with info from their /proc.
1674          */
1675
1676         fill_note(notes + 0, "CORE", NT_PRSTATUS, sizeof(*prstatus), prstatus);
1677         fill_psinfo(psinfo, current->group_leader, current->mm);
1678         fill_note(notes + 1, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
1679
1680         numnote = 2;
1681
1682         auxv = (elf_addr_t *) current->mm->saved_auxv;
1683
1684         i = 0;
1685         do
1686                 i += 2;
1687         while (auxv[i - 2] != AT_NULL);
1688         fill_note(&notes[numnote++], "CORE", NT_AUXV,
1689                   i * sizeof(elf_addr_t), auxv);
1690
1691         /* Try to dump the FPU. */
1692         if ((prstatus->pr_fpvalid =
1693              elf_core_copy_task_fpregs(current, cprm->regs, fpu)))
1694                 fill_note(notes + numnote++,
1695                           "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
1696 #ifdef ELF_CORE_COPY_XFPREGS
1697         if (elf_core_copy_task_xfpregs(current, xfpu))
1698                 fill_note(notes + numnote++,
1699                           "LINUX", ELF_CORE_XFPREG_TYPE, sizeof(*xfpu), xfpu);
1700 #endif
1701
1702         fs = get_fs();
1703         set_fs(KERNEL_DS);
1704
1705         offset += sizeof(*elf);                         /* Elf header */
1706         offset += segs * sizeof(struct elf_phdr);       /* Program headers */
1707
1708         /* Write notes phdr entry */
1709         {
1710                 int sz = 0;
1711
1712                 for (i = 0; i < numnote; i++)
1713                         sz += notesize(notes + i);
1714
1715                 sz += thread_status_size;
1716
1717                 phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
1718                 if (!phdr4note)
1719                         goto end_coredump;
1720
1721                 fill_elf_note_phdr(phdr4note, sz, offset);
1722                 offset += sz;
1723         }
1724
1725         /* Page-align dumped data */
1726         dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
1727
1728         offset += elf_core_vma_data_size(cprm->mm_flags);
1729         offset += elf_core_extra_data_size();
1730         e_shoff = offset;
1731
1732         if (e_phnum == PN_XNUM) {
1733                 shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
1734                 if (!shdr4extnum)
1735                         goto end_coredump;
1736                 fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
1737         }
1738
1739         offset = dataoff;
1740
1741         if (!dump_emit(cprm, elf, sizeof(*elf)))
1742                 goto end_coredump;
1743
1744         if (!dump_emit(cprm, phdr4note, sizeof(*phdr4note)))
1745                 goto end_coredump;
1746
1747         /* write program headers for segments dump */
1748         for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
1749                 struct elf_phdr phdr;
1750                 size_t sz;
1751
1752                 sz = vma->vm_end - vma->vm_start;
1753
1754                 phdr.p_type = PT_LOAD;
1755                 phdr.p_offset = offset;
1756                 phdr.p_vaddr = vma->vm_start;
1757                 phdr.p_paddr = 0;
1758                 phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0;
1759                 phdr.p_memsz = sz;
1760                 offset += phdr.p_filesz;
1761                 phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
1762                 if (vma->vm_flags & VM_WRITE)
1763                         phdr.p_flags |= PF_W;
1764                 if (vma->vm_flags & VM_EXEC)
1765                         phdr.p_flags |= PF_X;
1766                 phdr.p_align = ELF_EXEC_PAGESIZE;
1767
1768                 if (!dump_emit(cprm, &phdr, sizeof(phdr)))
1769                         goto end_coredump;
1770         }
1771
1772         if (!elf_core_write_extra_phdrs(cprm, offset))
1773                 goto end_coredump;
1774
1775         /* write out the notes section */
1776         for (i = 0; i < numnote; i++)
1777                 if (!writenote(notes + i, cprm))
1778                         goto end_coredump;
1779
1780         /* write out the thread status notes section */
1781         list_for_each(t, &thread_list) {
1782                 struct elf_thread_status *tmp =
1783                                 list_entry(t, struct elf_thread_status, list);
1784
1785                 for (i = 0; i < tmp->num_notes; i++)
1786                         if (!writenote(&tmp->notes[i], cprm))
1787                                 goto end_coredump;
1788         }
1789
1790         if (!dump_skip(cprm, dataoff - cprm->file->f_pos))
1791                 goto end_coredump;
1792
1793         if (!elf_fdpic_dump_segments(cprm))
1794                 goto end_coredump;
1795
1796         if (!elf_core_write_extra_data(cprm))
1797                 goto end_coredump;
1798
1799         if (e_phnum == PN_XNUM) {
1800                 if (!dump_emit(cprm, shdr4extnum, sizeof(*shdr4extnum)))
1801                         goto end_coredump;
1802         }
1803
1804         if (cprm->file->f_pos != offset) {
1805                 /* Sanity check */
1806                 printk(KERN_WARNING
1807                        "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
1808                        cprm->file->f_pos, offset);
1809         }
1810
1811 end_coredump:
1812         set_fs(fs);
1813
1814 cleanup:
1815         while (!list_empty(&thread_list)) {
1816                 struct list_head *tmp = thread_list.next;
1817                 list_del(tmp);
1818                 kfree(list_entry(tmp, struct elf_thread_status, list));
1819         }
1820         kfree(phdr4note);
1821         kfree(elf);
1822         kfree(prstatus);
1823         kfree(psinfo);
1824         kfree(notes);
1825         kfree(fpu);
1826         kfree(shdr4extnum);
1827 #ifdef ELF_CORE_COPY_XFPREGS
1828         kfree(xfpu);
1829 #endif
1830         return has_dumped;
1831 #undef NUM_NOTES
1832 }
1833
1834 #endif          /* CONFIG_ELF_CORE */