kernel/kexec_file.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * kexec: kexec_file_load system call
   4  *
   5  * Copyright (C) 2014 Red Hat Inc.
   6  * Authors:
   7  *      Vivek Goyal <vgoyal@redhat.com>
   8  */
   9
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/capability.h>
  13 #include <linux/mm.h>
  14 #include <linux/file.h>
  15 #include <linux/slab.h>
  16 #include <linux/kexec.h>
  17 #include <linux/memblock.h>
  18 #include <linux/mutex.h>
  19 #include <linux/list.h>
  20 #include <linux/fs.h>
  21 #include <linux/ima.h>
  22 #include <crypto/hash.h>
  23 #include <crypto/sha.h>
  24 #include <linux/elf.h>
  25 #include <linux/elfcore.h>
  26 #include <linux/kernel.h>
  27 #include <linux/syscalls.h>
  28 #include <linux/vmalloc.h>
  29 #include "kexec_internal.h"
  30
  31 static int kexec_calculate_store_digests(struct kimage *image);
  32
  33 /*
  34  * Currently this is the only default function that is exported as some
  35  * architectures need it to do additional handlings.
  36  * In the future, other default functions may be exported too if required.
  37  */
  38 int kexec_image_probe_default(struct kimage *image, void *buf,
  39                               unsigned long buf_len)
  40 {
  41         const struct kexec_file_ops * const *fops;
  42         int ret = -ENOEXEC;
  43
  44         for (fops = &kexec_file_loaders[0]; *fops && (*fops)->probe; ++fops) {
  45                 ret = (*fops)->probe(buf, buf_len);
  46                 if (!ret) {
  47                         image->fops = *fops;
  48                         return ret;
  49                 }
  50         }
  51
  52         return ret;
  53 }
  54
  55 /* Architectures can provide this probe function */
  56 int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
  57                                          unsigned long buf_len)
  58 {
  59         return kexec_image_probe_default(image, buf, buf_len);
  60 }
  61
  62 static void *kexec_image_load_default(struct kimage *image)
  63 {
  64         if (!image->fops || !image->fops->load)
  65                 return ERR_PTR(-ENOEXEC);
  66
  67         return image->fops->load(image, image->kernel_buf,
  68                                  image->kernel_buf_len, image->initrd_buf,
  69                                  image->initrd_buf_len, image->cmdline_buf,
  70                                  image->cmdline_buf_len);
  71 }
  72
  73 void * __weak arch_kexec_kernel_image_load(struct kimage *image)
  74 {
  75         return kexec_image_load_default(image);
  76 }
  77
  78 int kexec_image_post_load_cleanup_default(struct kimage *image)
  79 {
  80         if (!image->fops || !image->fops->cleanup)
  81                 return 0;
  82
  83         return image->fops->cleanup(image->image_loader_data);
  84 }
  85
  86 int __weak arch_kimage_file_post_load_cleanup(struct kimage *image)
  87 {
  88         return kexec_image_post_load_cleanup_default(image);
  89 }
  90
  91 #ifdef CONFIG_KEXEC_SIG
  92 static int kexec_image_verify_sig_default(struct kimage *image, void *buf,
  93                                           unsigned long buf_len)
  94 {
  95         if (!image->fops || !image->fops->verify_sig) {
  96                 pr_debug("kernel loader does not support signature verification.\n");
  97                 return -EKEYREJECTED;
  98         }
  99
 100         return image->fops->verify_sig(buf, buf_len);
 101 }
 102
 103 int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
 104                                         unsigned long buf_len)
 105 {
 106         return kexec_image_verify_sig_default(image, buf, buf_len);
 107 }
 108 #endif
 109
 110 /*
 111  * arch_kexec_apply_relocations_add - apply relocations of type RELA
 112  * @pi:         Purgatory to be relocated.
 113  * @section:    Section relocations applying to.
 114  * @relsec:     Section containing RELAs.
 115  * @symtab:     Corresponding symtab.
 116  *
 117  * Return: 0 on success, negative errno on error.
 118  */
 119 int __weak
 120 arch_kexec_apply_relocations_add(struct purgatory_info *pi, Elf_Shdr *section,
 121                                  const Elf_Shdr *relsec, const Elf_Shdr *symtab)
 122 {
 123         pr_err("RELA relocation unsupported.\n");
 124         return -ENOEXEC;
 125 }
 126
 127 /*
 128  * arch_kexec_apply_relocations - apply relocations of type REL
 129  * @pi:         Purgatory to be relocated.
 130  * @section:    Section relocations applying to.
 131  * @relsec:     Section containing RELs.
 132  * @symtab:     Corresponding symtab.
 133  *
 134  * Return: 0 on success, negative errno on error.
 135  */
 136 int __weak
 137 arch_kexec_apply_relocations(struct purgatory_info *pi, Elf_Shdr *section,
 138                              const Elf_Shdr *relsec, const Elf_Shdr *symtab)
 139 {
 140         pr_err("REL relocation unsupported.\n");
 141         return -ENOEXEC;
 142 }
 143
 144 /*
 145  * Free up memory used by kernel, initrd, and command line. This is temporary
 146  * memory allocation which is not needed any more after these buffers have
 147  * been loaded into separate segments and have been copied elsewhere.
 148  */
 149 void kimage_file_post_load_cleanup(struct kimage *image)
 150 {
 151         struct purgatory_info *pi = &image->purgatory_info;
 152
 153         vfree(image->kernel_buf);
 154         image->kernel_buf = NULL;
 155
 156         vfree(image->initrd_buf);
 157         image->initrd_buf = NULL;
 158
 159         kfree(image->cmdline_buf);
 160         image->cmdline_buf = NULL;
 161
 162         vfree(pi->purgatory_buf);
 163         pi->purgatory_buf = NULL;
 164
 165         vfree(pi->sechdrs);
 166         pi->sechdrs = NULL;
 167
 168         /* See if architecture has anything to cleanup post load */
 169         arch_kimage_file_post_load_cleanup(image);
 170
 171         /*
 172          * Above call should have called into bootloader to free up
 173          * any data stored in kimage->image_loader_data. It should
 174          * be ok now to free it up.
 175          */
 176         kfree(image->image_loader_data);
 177         image->image_loader_data = NULL;
 178 }
 179
 180 #ifdef CONFIG_KEXEC_SIG
 181 static int
 182 kimage_validate_signature(struct kimage *image)
 183 {
 184         const char *reason;
 185         int ret;
 186
 187         ret = arch_kexec_kernel_verify_sig(image, image->kernel_buf,
 188                                            image->kernel_buf_len);
 189         switch (ret) {
 190         case 0:
 191                 break;
 192
 193                 /* Certain verification errors are non-fatal if we're not
 194                  * checking errors, provided we aren't mandating that there
 195                  * must be a valid signature.
 196                  */
 197         case -ENODATA:
 198                 reason = "kexec of unsigned image";
 199                 goto decide;
 200         case -ENOPKG:
 201                 reason = "kexec of image with unsupported crypto";
 202                 goto decide;
 203         case -ENOKEY:
 204                 reason = "kexec of image with unavailable key";
 205         decide:
 206                 if (IS_ENABLED(CONFIG_KEXEC_SIG_FORCE)) {
 207                         pr_notice("%s rejected\n", reason);
 208                         return ret;
 209                 }
 210
 211                 return 0;
 212
 213                 /* All other errors are fatal, including nomem, unparseable
 214                  * signatures and signature check failures - even if signatures
 215                  * aren't required.
 216                  */
 217         default:
 218                 pr_notice("kernel signature verification failed (%d).\n", ret);
 219         }
 220
 221         return ret;
 222 }
 223 #endif
 224
 225 /*
 226  * In file mode list of segments is prepared by kernel. Copy relevant
 227  * data from user space, do error checking, prepare segment list
 228  */
 229 static int
 230 kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
 231                              const char __user *cmdline_ptr,
 232                              unsigned long cmdline_len, unsigned flags)
 233 {
 234         int ret;
 235         void *ldata;
 236         loff_t size;
 237
 238         ret = kernel_read_file_from_fd(kernel_fd, &image->kernel_buf,
 239                                        &size, INT_MAX, READING_KEXEC_IMAGE);
 240         if (ret)
 241                 return ret;
 242         image->kernel_buf_len = size;
 243
 244         /* IMA needs to pass the measurement list to the next kernel. */
 245         ima_add_kexec_buffer(image);
 246
 247         /* Call arch image probe handlers */
 248         ret = arch_kexec_kernel_image_probe(image, image->kernel_buf,
 249                                             image->kernel_buf_len);
 250         if (ret)
 251                 goto out;
 252
 253 #ifdef CONFIG_KEXEC_SIG
 254         ret = kimage_validate_signature(image);
 255
 256         if (ret)
 257                 goto out;
 258 #endif
 259         /* It is possible that there no initramfs is being loaded */
 260         if (!(flags & KEXEC_FILE_NO_INITRAMFS)) {
 261                 ret = kernel_read_file_from_fd(initrd_fd, &image->initrd_buf,
 262                                                &size, INT_MAX,
 263                                                READING_KEXEC_INITRAMFS);
 264                 if (ret)
 265                         goto out;
 266                 image->initrd_buf_len = size;
 267         }
 268
 269         if (cmdline_len) {
 270                 image->cmdline_buf = memdup_user(cmdline_ptr, cmdline_len);
 271                 if (IS_ERR(image->cmdline_buf)) {
 272                         ret = PTR_ERR(image->cmdline_buf);
 273                         image->cmdline_buf = NULL;
 274                         goto out;
 275                 }
 276
 277                 image->cmdline_buf_len = cmdline_len;
 278
 279                 /* command line should be a string with last byte null */
 280                 if (image->cmdline_buf[cmdline_len - 1] != '\0') {
 281                         ret = -EINVAL;
 282                         goto out;
 283                 }
 284         }
 285
 286         /* Call arch image load handlers */
 287         ldata = arch_kexec_kernel_image_load(image);
 288
 289         if (IS_ERR(ldata)) {
 290                 ret = PTR_ERR(ldata);
 291                 goto out;
 292         }
 293
 294         image->image_loader_data = ldata;
 295 out:
 296         /* In case of error, free up all allocated memory in this function */
 297         if (ret)
 298                 kimage_file_post_load_cleanup(image);
 299         return ret;
 300 }
 301
 302 static int
 303 kimage_file_alloc_init(struct kimage **rimage, int kernel_fd,
 304                        int initrd_fd, const char __user *cmdline_ptr,
 305                        unsigned long cmdline_len, unsigned long flags)
 306 {
 307         int ret;
 308         struct kimage *image;
 309         bool kexec_on_panic = flags & KEXEC_FILE_ON_CRASH;
 310
 311         image = do_kimage_alloc_init();
 312         if (!image)
 313                 return -ENOMEM;
 314
 315         image->file_mode = 1;
 316
 317         if (kexec_on_panic) {
 318                 /* Enable special crash kernel control page alloc policy. */
 319                 image->control_page = crashk_res.start;
 320                 image->type = KEXEC_TYPE_CRASH;
 321         }
 322
 323         ret = kimage_file_prepare_segments(image, kernel_fd, initrd_fd,
 324                                            cmdline_ptr, cmdline_len, flags);
 325         if (ret)
 326                 goto out_free_image;
 327
 328         ret = sanity_check_segment_list(image);
 329         if (ret)
 330                 goto out_free_post_load_bufs;
 331
 332         ret = -ENOMEM;
 333         image->control_code_page = kimage_alloc_control_pages(image,
 334                                            get_order(KEXEC_CONTROL_PAGE_SIZE));
 335         if (!image->control_code_page) {
 336                 pr_err("Could not allocate control_code_buffer\n");
 337                 goto out_free_post_load_bufs;
 338         }
 339
 340         if (!kexec_on_panic) {
 341                 image->swap_page = kimage_alloc_control_pages(image, 0);
 342                 if (!image->swap_page) {
 343                         pr_err("Could not allocate swap buffer\n");
 344                         goto out_free_control_pages;
 345                 }
 346         }
 347
 348         *rimage = image;
 349         return 0;
 350 out_free_control_pages:
 351         kimage_free_page_list(&image->control_pages);
 352 out_free_post_load_bufs:
 353         kimage_file_post_load_cleanup(image);
 354 out_free_image:
 355         kfree(image);
 356         return ret;
 357 }
 358
 359 SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
 360                 unsigned long, cmdline_len, const char __user *, cmdline_ptr,
 361                 unsigned long, flags)
 362 {
 363         int ret = 0, i;
 364         struct kimage **dest_image, *image;
 365
 366         /* We only trust the superuser with rebooting the system. */
 367         if (!capable(CAP_SYS_BOOT) || kexec_load_disabled)
 368                 return -EPERM;
 369
 370         /* Make sure we have a legal set of flags */
 371         if (flags != (flags & KEXEC_FILE_FLAGS))
 372                 return -EINVAL;
 373
 374         image = NULL;
 375
 376         if (!mutex_trylock(&kexec_mutex))
 377                 return -EBUSY;
 378
 379         dest_image = &kexec_image;
 380         if (flags & KEXEC_FILE_ON_CRASH) {
 381                 dest_image = &kexec_crash_image;
 382                 if (kexec_crash_image)
 383                         arch_kexec_unprotect_crashkres();
 384         }
 385
 386         if (flags & KEXEC_FILE_UNLOAD)
 387                 goto exchange;
 388
 389         /*
 390          * In case of crash, new kernel gets loaded in reserved region. It is
 391          * same memory where old crash kernel might be loaded. Free any
 392          * current crash dump kernel before we corrupt it.
 393          */
 394         if (flags & KEXEC_FILE_ON_CRASH)
 395                 kimage_free(xchg(&kexec_crash_image, NULL));
 396
 397         ret = kimage_file_alloc_init(&image, kernel_fd, initrd_fd, cmdline_ptr,
 398                                      cmdline_len, flags);
 399         if (ret)
 400                 goto out;
 401
 402         ret = machine_kexec_prepare(image);
 403         if (ret)
 404                 goto out;
 405
 406         /*
 407          * Some architecture(like S390) may touch the crash memory before
 408          * machine_kexec_prepare(), we must copy vmcoreinfo data after it.
 409          */
 410         ret = kimage_crash_copy_vmcoreinfo(image);
 411         if (ret)
 412                 goto out;
 413
 414         ret = kexec_calculate_store_digests(image);
 415         if (ret)
 416                 goto out;
 417
 418         for (i = 0; i < image->nr_segments; i++) {
 419                 struct kexec_segment *ksegment;
 420
 421                 ksegment = &image->segment[i];
 422                 pr_debug("Loading segment %d: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
 423                          i, ksegment->buf, ksegment->bufsz, ksegment->mem,
 424                          ksegment->memsz);
 425
 426                 ret = kimage_load_segment(image, &image->segment[i]);
 427                 if (ret)
 428                         goto out;
 429         }
 430
 431         kimage_terminate(image);
 432
 433         /*
 434          * Free up any temporary buffers allocated which are not needed
 435          * after image has been loaded
 436          */
 437         kimage_file_post_load_cleanup(image);
 438 exchange:
 439         image = xchg(dest_image, image);
 440 out:
 441         if ((flags & KEXEC_FILE_ON_CRASH) && kexec_crash_image)
 442                 arch_kexec_protect_crashkres();
 443
 444         mutex_unlock(&kexec_mutex);
 445         kimage_free(image);
 446         return ret;
 447 }
 448
 449 static int locate_mem_hole_top_down(unsigned long start, unsigned long end,
 450                                     struct kexec_buf *kbuf)
 451 {
 452         struct kimage *image = kbuf->image;
 453         unsigned long temp_start, temp_end;
 454
 455         temp_end = min(end, kbuf->buf_max);
 456         temp_start = temp_end - kbuf->memsz;
 457
 458         do {
 459                 /* align down start */
 460                 temp_start = temp_start & (~(kbuf->buf_align - 1));
 461
 462                 if (temp_start < start || temp_start < kbuf->buf_min)
 463                         return 0;
 464
 465                 temp_end = temp_start + kbuf->memsz - 1;
 466
 467                 /*
 468                  * Make sure this does not conflict with any of existing
 469                  * segments
 470                  */
 471                 if (kimage_is_destination_range(image, temp_start, temp_end)) {
 472                         temp_start = temp_start - PAGE_SIZE;
 473                         continue;
 474                 }
 475
 476                 /* We found a suitable memory range */
 477                 break;
 478         } while (1);
 479
 480         /* If we are here, we found a suitable memory range */
 481         kbuf->mem = temp_start;
 482
 483         /* Success, stop navigating through remaining System RAM ranges */
 484         return 1;
 485 }
 486
 487 static int locate_mem_hole_bottom_up(unsigned long start, unsigned long end,
 488                                      struct kexec_buf *kbuf)
 489 {
 490         struct kimage *image = kbuf->image;
 491         unsigned long temp_start, temp_end;
 492
 493         temp_start = max(start, kbuf->buf_min);
 494
 495         do {
 496                 temp_start = ALIGN(temp_start, kbuf->buf_align);
 497                 temp_end = temp_start + kbuf->memsz - 1;
 498
 499                 if (temp_end > end || temp_end > kbuf->buf_max)
 500                         return 0;
 501                 /*
 502                  * Make sure this does not conflict with any of existing
 503                  * segments
 504                  */
 505                 if (kimage_is_destination_range(image, temp_start, temp_end)) {
 506                         temp_start = temp_start + PAGE_SIZE;
 507                         continue;
 508                 }
 509
 510                 /* We found a suitable memory range */
 511                 break;
 512         } while (1);
 513
 514         /* If we are here, we found a suitable memory range */
 515         kbuf->mem = temp_start;
 516
 517         /* Success, stop navigating through remaining System RAM ranges */
 518         return 1;
 519 }
 520
 521 static int locate_mem_hole_callback(struct resource *res, void *arg)
 522 {
 523         struct kexec_buf *kbuf = (struct kexec_buf *)arg;
 524         u64 start = res->start, end = res->end;
 525         unsigned long sz = end - start + 1;
 526
 527         /* Returning 0 will take to next memory range */
 528         if (sz < kbuf->memsz)
 529                 return 0;
 530
 531         if (end < kbuf->buf_min || start > kbuf->buf_max)
 532                 return 0;
 533
 534         /*
 535          * Allocate memory top down with-in ram range. Otherwise bottom up
 536          * allocation.
 537          */
 538         if (kbuf->top_down)
 539                 return locate_mem_hole_top_down(start, end, kbuf);
 540         return locate_mem_hole_bottom_up(start, end, kbuf);
 541 }
 542
 543 #ifdef CONFIG_ARCH_KEEP_MEMBLOCK
 544 static int kexec_walk_memblock(struct kexec_buf *kbuf,
 545                                int (*func)(struct resource *, void *))
 546 {
 547         int ret = 0;
 548         u64 i;
 549         phys_addr_t mstart, mend;
 550         struct resource res = { };
 551
 552         if (kbuf->image->type == KEXEC_TYPE_CRASH)
 553                 return func(&crashk_res, kbuf);
 554
 555         if (kbuf->top_down) {
 556                 for_each_free_mem_range_reverse(i, NUMA_NO_NODE, MEMBLOCK_NONE,
 557                                                 &mstart, &mend, NULL) {
 558                         /*
 559                          * In memblock, end points to the first byte after the
 560                          * range while in kexec, end points to the last byte
 561                          * in the range.
 562                          */
 563                         res.start = mstart;
 564                         res.end = mend - 1;
 565                         ret = func(&res, kbuf);
 566                         if (ret)
 567                                 break;
 568                 }
 569         } else {
 570                 for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE,
 571                                         &mstart, &mend, NULL) {
 572                         /*
 573                          * In memblock, end points to the first byte after the
 574                          * range while in kexec, end points to the last byte
 575                          * in the range.
 576                          */
 577                         res.start = mstart;
 578                         res.end = mend - 1;
 579                         ret = func(&res, kbuf);
 580                         if (ret)
 581                                 break;
 582                 }
 583         }
 584
 585         return ret;
 586 }
 587 #else
 588 static int kexec_walk_memblock(struct kexec_buf *kbuf,
 589                                int (*func)(struct resource *, void *))
 590 {
 591         return 0;
 592 }
 593 #endif
 594
 595 /**
 596  * kexec_walk_resources - call func(data) on free memory regions
 597  * @kbuf:       Context info for the search. Also passed to @func.
 598  * @func:       Function to call for each memory region.
 599  *
 600  * Return: The memory walk will stop when func returns a non-zero value
 601  * and that value will be returned. If all free regions are visited without
 602  * func returning non-zero, then zero will be returned.
 603  */
 604 static int kexec_walk_resources(struct kexec_buf *kbuf,
 605                                 int (*func)(struct resource *, void *))
 606 {
 607         if (kbuf->image->type == KEXEC_TYPE_CRASH)
 608                 return walk_iomem_res_desc(crashk_res.desc,
 609                                            IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY,
 610                                            crashk_res.start, crashk_res.end,
 611                                            kbuf, func);
 612         else
 613                 return walk_system_ram_res(0, ULONG_MAX, kbuf, func);
 614 }
 615
 616 /**
 617  * kexec_locate_mem_hole - find free memory for the purgatory or the next kernel
 618  * @kbuf:       Parameters for the memory search.
 619  *
 620  * On success, kbuf->mem will have the start address of the memory region found.
 621  *
 622  * Return: 0 on success, negative errno on error.
 623  */
 624 int kexec_locate_mem_hole(struct kexec_buf *kbuf)
 625 {
 626         int ret;
 627
 628         /* Arch knows where to place */
 629         if (kbuf->mem != KEXEC_BUF_MEM_UNKNOWN)
 630                 return 0;
 631
 632         if (!IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK))
 633                 ret = kexec_walk_resources(kbuf, locate_mem_hole_callback);
 634         else
 635                 ret = kexec_walk_memblock(kbuf, locate_mem_hole_callback);
 636
 637         return ret == 1 ? 0 : -EADDRNOTAVAIL;
 638 }
 639
 640 /**
 641  * kexec_add_buffer - place a buffer in a kexec segment
 642  * @kbuf:       Buffer contents and memory parameters.
 643  *
 644  * This function assumes that kexec_mutex is held.
 645  * On successful return, @kbuf->mem will have the physical address of
 646  * the buffer in memory.
 647  *
 648  * Return: 0 on success, negative errno on error.
 649  */
 650 int kexec_add_buffer(struct kexec_buf *kbuf)
 651 {
 652
 653         struct kexec_segment *ksegment;
 654         int ret;
 655
 656         /* Currently adding segment this way is allowed only in file mode */
 657         if (!kbuf->image->file_mode)
 658                 return -EINVAL;
 659
 660         if (kbuf->image->nr_segments >= KEXEC_SEGMENT_MAX)
 661                 return -EINVAL;
 662
 663         /*
 664          * Make sure we are not trying to add buffer after allocating
 665          * control pages. All segments need to be placed first before
 666          * any control pages are allocated. As control page allocation
 667          * logic goes through list of segments to make sure there are
 668          * no destination overlaps.
 669          */
 670         if (!list_empty(&kbuf->image->control_pages)) {
 671                 WARN_ON(1);
 672                 return -EINVAL;
 673         }
 674
 675         /* Ensure minimum alignment needed for segments. */
 676         kbuf->memsz = ALIGN(kbuf->memsz, PAGE_SIZE);
 677         kbuf->buf_align = max(kbuf->buf_align, PAGE_SIZE);
 678
 679         /* Walk the RAM ranges and allocate a suitable range for the buffer */
 680         ret = kexec_locate_mem_hole(kbuf);
 681         if (ret)
 682                 return ret;
 683
 684         /* Found a suitable memory range */
 685         ksegment = &kbuf->image->segment[kbuf->image->nr_segments];
 686         ksegment->kbuf = kbuf->buffer;
 687         ksegment->bufsz = kbuf->bufsz;
 688         ksegment->mem = kbuf->mem;
 689         ksegment->memsz = kbuf->memsz;
 690         kbuf->image->nr_segments++;
 691         return 0;
 692 }
 693
 694 /* Calculate and store the digest of segments */
 695 static int kexec_calculate_store_digests(struct kimage *image)
 696 {
 697         struct crypto_shash *tfm;
 698         struct shash_desc *desc;
 699         int ret = 0, i, j, zero_buf_sz, sha_region_sz;
 700         size_t desc_size, nullsz;
 701         char *digest;
 702         void *zero_buf;
 703         struct kexec_sha_region *sha_regions;
 704         struct purgatory_info *pi = &image->purgatory_info;
 705
 706         if (!IS_ENABLED(CONFIG_ARCH_HAS_KEXEC_PURGATORY))
 707                 return 0;
 708
 709         zero_buf = __va(page_to_pfn(ZERO_PAGE(0)) << PAGE_SHIFT);
 710         zero_buf_sz = PAGE_SIZE;
 711
 712         tfm = crypto_alloc_shash("sha256", 0, 0);
 713         if (IS_ERR(tfm)) {
 714                 ret = PTR_ERR(tfm);
 715                 goto out;
 716         }
 717
 718         desc_size = crypto_shash_descsize(tfm) + sizeof(*desc);
 719         desc = kzalloc(desc_size, GFP_KERNEL);
 720         if (!desc) {
 721                 ret = -ENOMEM;
 722                 goto out_free_tfm;
 723         }
 724
 725         sha_region_sz = KEXEC_SEGMENT_MAX * sizeof(struct kexec_sha_region);
 726         sha_regions = vzalloc(sha_region_sz);
 727         if (!sha_regions)
 728                 goto out_free_desc;
 729
 730         desc->tfm   = tfm;
 731
 732         ret = crypto_shash_init(desc);
 733         if (ret < 0)
 734                 goto out_free_sha_regions;
 735
 736         digest = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);
 737         if (!digest) {
 738                 ret = -ENOMEM;
 739                 goto out_free_sha_regions;
 740         }
 741
 742         for (j = i = 0; i < image->nr_segments; i++) {
 743                 struct kexec_segment *ksegment;
 744
 745                 ksegment = &image->segment[i];
 746                 /*
 747                  * Skip purgatory as it will be modified once we put digest
 748                  * info in purgatory.
 749                  */
 750                 if (ksegment->kbuf == pi->purgatory_buf)
 751                         continue;
 752
 753                 ret = crypto_shash_update(desc, ksegment->kbuf,
 754                                           ksegment->bufsz);
 755                 if (ret)
 756                         break;
 757
 758                 /*
 759                  * Assume rest of the buffer is filled with zero and
 760                  * update digest accordingly.
 761                  */
 762                 nullsz = ksegment->memsz - ksegment->bufsz;
 763                 while (nullsz) {
 764                         unsigned long bytes = nullsz;
 765
 766                         if (bytes > zero_buf_sz)
 767                                 bytes = zero_buf_sz;
 768                         ret = crypto_shash_update(desc, zero_buf, bytes);
 769                         if (ret)
 770                                 break;
 771                         nullsz -= bytes;
 772                 }
 773
 774                 if (ret)
 775                         break;
 776
 777                 sha_regions[j].start = ksegment->mem;
 778                 sha_regions[j].len = ksegment->memsz;
 779                 j++;
 780         }
 781
 782         if (!ret) {
 783                 ret = crypto_shash_final(desc, digest);
 784                 if (ret)
 785                         goto out_free_digest;
 786                 ret = kexec_purgatory_get_set_symbol(image, "purgatory_sha_regions",
 787                                                      sha_regions, sha_region_sz, 0);
 788                 if (ret)
 789                         goto out_free_digest;
 790
 791                 ret = kexec_purgatory_get_set_symbol(image, "purgatory_sha256_digest",
 792                                                      digest, SHA256_DIGEST_SIZE, 0);
 793                 if (ret)
 794                         goto out_free_digest;
 795         }
 796
 797 out_free_digest:
 798         kfree(digest);
 799 out_free_sha_regions:
 800         vfree(sha_regions);
 801 out_free_desc:
 802         kfree(desc);
 803 out_free_tfm:
 804         kfree(tfm);
 805 out:
 806         return ret;
 807 }
 808
 809 #ifdef CONFIG_ARCH_HAS_KEXEC_PURGATORY
 810 /*
 811  * kexec_purgatory_setup_kbuf - prepare buffer to load purgatory.
 812  * @pi:         Purgatory to be loaded.
 813  * @kbuf:       Buffer to setup.
 814  *
 815  * Allocates the memory needed for the buffer. Caller is responsible to free
 816  * the memory after use.
 817  *
 818  * Return: 0 on success, negative errno on error.
 819  */
 820 static int kexec_purgatory_setup_kbuf(struct purgatory_info *pi,
 821                                       struct kexec_buf *kbuf)
 822 {
 823         const Elf_Shdr *sechdrs;
 824         unsigned long bss_align;
 825         unsigned long bss_sz;
 826         unsigned long align;
 827         int i, ret;
 828
 829         sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff;
 830         kbuf->buf_align = bss_align = 1;
 831         kbuf->bufsz = bss_sz = 0;
 832
 833         for (i = 0; i < pi->ehdr->e_shnum; i++) {
 834                 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
 835                         continue;
 836
 837                 align = sechdrs[i].sh_addralign;
 838                 if (sechdrs[i].sh_type != SHT_NOBITS) {
 839                         if (kbuf->buf_align < align)
 840                                 kbuf->buf_align = align;
 841                         kbuf->bufsz = ALIGN(kbuf->bufsz, align);
 842                         kbuf->bufsz += sechdrs[i].sh_size;
 843                 } else {
 844                         if (bss_align < align)
 845                                 bss_align = align;
 846                         bss_sz = ALIGN(bss_sz, align);
 847                         bss_sz += sechdrs[i].sh_size;
 848                 }
 849         }
 850         kbuf->bufsz = ALIGN(kbuf->bufsz, bss_align);
 851         kbuf->memsz = kbuf->bufsz + bss_sz;
 852         if (kbuf->buf_align < bss_align)
 853                 kbuf->buf_align = bss_align;
 854
 855         kbuf->buffer = vzalloc(kbuf->bufsz);
 856         if (!kbuf->buffer)
 857                 return -ENOMEM;
 858         pi->purgatory_buf = kbuf->buffer;
 859
 860         ret = kexec_add_buffer(kbuf);
 861         if (ret)
 862                 goto out;
 863
 864         return 0;
 865 out:
 866         vfree(pi->purgatory_buf);
 867         pi->purgatory_buf = NULL;
 868         return ret;
 869 }
 870
 871 /*
 872  * kexec_purgatory_setup_sechdrs - prepares the pi->sechdrs buffer.
 873  * @pi:         Purgatory to be loaded.
 874  * @kbuf:       Buffer prepared to store purgatory.
 875  *
 876  * Allocates the memory needed for the buffer. Caller is responsible to free
 877  * the memory after use.
 878  *
 879  * Return: 0 on success, negative errno on error.
 880  */
 881 static int kexec_purgatory_setup_sechdrs(struct purgatory_info *pi,
 882                                          struct kexec_buf *kbuf)
 883 {
 884         unsigned long bss_addr;
 885         unsigned long offset;
 886         Elf_Shdr *sechdrs;
 887         int i;
 888
 889         /*
 890          * The section headers in kexec_purgatory are read-only. In order to
 891          * have them modifiable make a temporary copy.
 892          */
 893         sechdrs = vzalloc(array_size(sizeof(Elf_Shdr), pi->ehdr->e_shnum));
 894         if (!sechdrs)
 895                 return -ENOMEM;
 896         memcpy(sechdrs, (void *)pi->ehdr + pi->ehdr->e_shoff,
 897                pi->ehdr->e_shnum * sizeof(Elf_Shdr));
 898         pi->sechdrs = sechdrs;
 899
 900         offset = 0;
 901         bss_addr = kbuf->mem + kbuf->bufsz;
 902         kbuf->image->start = pi->ehdr->e_entry;
 903
 904         for (i = 0; i < pi->ehdr->e_shnum; i++) {
 905                 unsigned long align;
 906                 void *src, *dst;
 907
 908                 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
 909                         continue;
 910
 911                 align = sechdrs[i].sh_addralign;
 912                 if (sechdrs[i].sh_type == SHT_NOBITS) {
 913                         bss_addr = ALIGN(bss_addr, align);
 914                         sechdrs[i].sh_addr = bss_addr;
 915                         bss_addr += sechdrs[i].sh_size;
 916                         continue;
 917                 }
 918
 919                 offset = ALIGN(offset, align);
 920                 if (sechdrs[i].sh_flags & SHF_EXECINSTR &&
 921                     pi->ehdr->e_entry >= sechdrs[i].sh_addr &&
 922                     pi->ehdr->e_entry < (sechdrs[i].sh_addr
 923                                          + sechdrs[i].sh_size)) {
 924                         kbuf->image->start -= sechdrs[i].sh_addr;
 925                         kbuf->image->start += kbuf->mem + offset;
 926                 }
 927
 928                 src = (void *)pi->ehdr + sechdrs[i].sh_offset;
 929                 dst = pi->purgatory_buf + offset;
 930                 memcpy(dst, src, sechdrs[i].sh_size);
 931
 932                 sechdrs[i].sh_addr = kbuf->mem + offset;
 933                 sechdrs[i].sh_offset = offset;
 934                 offset += sechdrs[i].sh_size;
 935         }
 936
 937         return 0;
 938 }
 939
 940 static int kexec_apply_relocations(struct kimage *image)
 941 {
 942         int i, ret;
 943         struct purgatory_info *pi = &image->purgatory_info;
 944         const Elf_Shdr *sechdrs;
 945
 946         sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff;
 947
 948         for (i = 0; i < pi->ehdr->e_shnum; i++) {
 949                 const Elf_Shdr *relsec;
 950                 const Elf_Shdr *symtab;
 951                 Elf_Shdr *section;
 952
 953                 relsec = sechdrs + i;
 954
 955                 if (relsec->sh_type != SHT_RELA &&
 956                     relsec->sh_type != SHT_REL)
 957                         continue;
 958
 959                 /*
 960                  * For section of type SHT_RELA/SHT_REL,
 961                  * ->sh_link contains section header index of associated
 962                  * symbol table. And ->sh_info contains section header
 963                  * index of section to which relocations apply.
 964                  */
 965                 if (relsec->sh_info >= pi->ehdr->e_shnum ||
 966                     relsec->sh_link >= pi->ehdr->e_shnum)
 967                         return -ENOEXEC;
 968
 969                 section = pi->sechdrs + relsec->sh_info;
 970                 symtab = sechdrs + relsec->sh_link;
 971
 972                 if (!(section->sh_flags & SHF_ALLOC))
 973                         continue;
 974
 975                 /*
 976                  * symtab->sh_link contain section header index of associated
 977                  * string table.
 978                  */
 979                 if (symtab->sh_link >= pi->ehdr->e_shnum)
 980                         /* Invalid section number? */
 981                         continue;
 982
 983                 /*
 984                  * Respective architecture needs to provide support for applying
 985                  * relocations of type SHT_RELA/SHT_REL.
 986                  */
 987                 if (relsec->sh_type == SHT_RELA)
 988                         ret = arch_kexec_apply_relocations_add(pi, section,
 989                                                                relsec, symtab);
 990                 else if (relsec->sh_type == SHT_REL)
 991                         ret = arch_kexec_apply_relocations(pi, section,
 992                                                            relsec, symtab);
 993                 if (ret)
 994                         return ret;
 995         }
 996
 997         return 0;
 998 }
 999
1000 /*
1001  * kexec_load_purgatory - Load and relocate the purgatory object.
1002  * @image:      Image to add the purgatory to.
1003  * @kbuf:       Memory parameters to use.
1004  *
1005  * Allocates the memory needed for image->purgatory_info.sechdrs and
1006  * image->purgatory_info.purgatory_buf/kbuf->buffer. Caller is responsible
1007  * to free the memory after use.
1008  *
1009  * Return: 0 on success, negative errno on error.
1010  */
1011 int kexec_load_purgatory(struct kimage *image, struct kexec_buf *kbuf)
1012 {
1013         struct purgatory_info *pi = &image->purgatory_info;
1014         int ret;
1015
1016         if (kexec_purgatory_size <= 0)
1017                 return -EINVAL;
1018
1019         pi->ehdr = (const Elf_Ehdr *)kexec_purgatory;
1020
1021         ret = kexec_purgatory_setup_kbuf(pi, kbuf);
1022         if (ret)
1023                 return ret;
1024
1025         ret = kexec_purgatory_setup_sechdrs(pi, kbuf);
1026         if (ret)
1027                 goto out_free_kbuf;
1028
1029         ret = kexec_apply_relocations(image);
1030         if (ret)
1031                 goto out;
1032
1033         return 0;
1034 out:
1035         vfree(pi->sechdrs);
1036         pi->sechdrs = NULL;
1037 out_free_kbuf:
1038         vfree(pi->purgatory_buf);
1039         pi->purgatory_buf = NULL;
1040         return ret;
1041 }
1042
1043 /*
1044  * kexec_purgatory_find_symbol - find a symbol in the purgatory
1045  * @pi:         Purgatory to search in.
1046  * @name:       Name of the symbol.
1047  *
1048  * Return: pointer to symbol in read-only symtab on success, NULL on error.
1049  */
1050 static const Elf_Sym *kexec_purgatory_find_symbol(struct purgatory_info *pi,
1051                                                   const char *name)
1052 {
1053         const Elf_Shdr *sechdrs;
1054         const Elf_Ehdr *ehdr;
1055         const Elf_Sym *syms;
1056         const char *strtab;
1057         int i, k;
1058
1059         if (!pi->ehdr)
1060                 return NULL;
1061
1062         ehdr = pi->ehdr;
1063         sechdrs = (void *)ehdr + ehdr->e_shoff;
1064
1065         for (i = 0; i < ehdr->e_shnum; i++) {
1066                 if (sechdrs[i].sh_type != SHT_SYMTAB)
1067                         continue;
1068
1069                 if (sechdrs[i].sh_link >= ehdr->e_shnum)
1070                         /* Invalid strtab section number */
1071                         continue;
1072                 strtab = (void *)ehdr + sechdrs[sechdrs[i].sh_link].sh_offset;
1073                 syms = (void *)ehdr + sechdrs[i].sh_offset;
1074
1075                 /* Go through symbols for a match */
1076                 for (k = 0; k < sechdrs[i].sh_size/sizeof(Elf_Sym); k++) {
1077                         if (ELF_ST_BIND(syms[k].st_info) != STB_GLOBAL)
1078                                 continue;
1079
1080                         if (strcmp(strtab + syms[k].st_name, name) != 0)
1081                                 continue;
1082
1083                         if (syms[k].st_shndx == SHN_UNDEF ||
1084                             syms[k].st_shndx >= ehdr->e_shnum) {
1085                                 pr_debug("Symbol: %s has bad section index %d.\n",
1086                                                 name, syms[k].st_shndx);
1087                                 return NULL;
1088                         }
1089
1090                         /* Found the symbol we are looking for */
1091                         return &syms[k];
1092                 }
1093         }
1094
1095         return NULL;
1096 }
1097
1098 void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name)
1099 {
1100         struct purgatory_info *pi = &image->purgatory_info;
1101         const Elf_Sym *sym;
1102         Elf_Shdr *sechdr;
1103
1104         sym = kexec_purgatory_find_symbol(pi, name);
1105         if (!sym)
1106                 return ERR_PTR(-EINVAL);
1107
1108         sechdr = &pi->sechdrs[sym->st_shndx];
1109
1110         /*
1111          * Returns the address where symbol will finally be loaded after
1112          * kexec_load_segment()
1113          */
1114         return (void *)(sechdr->sh_addr + sym->st_value);
1115 }
1116
1117 /*
1118  * Get or set value of a symbol. If "get_value" is true, symbol value is
1119  * returned in buf otherwise symbol value is set based on value in buf.
1120  */
1121 int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name,
1122                                    void *buf, unsigned int size, bool get_value)
1123 {
1124         struct purgatory_info *pi = &image->purgatory_info;
1125         const Elf_Sym *sym;
1126         Elf_Shdr *sec;
1127         char *sym_buf;
1128
1129         sym = kexec_purgatory_find_symbol(pi, name);
1130         if (!sym)
1131                 return -EINVAL;
1132
1133         if (sym->st_size != size) {
1134                 pr_err("symbol %s size mismatch: expected %lu actual %u\n",
1135                        name, (unsigned long)sym->st_size, size);
1136                 return -EINVAL;
1137         }
1138
1139         sec = pi->sechdrs + sym->st_shndx;
1140
1141         if (sec->sh_type == SHT_NOBITS) {
1142                 pr_err("symbol %s is in a bss section. Cannot %s\n", name,
1143                        get_value ? "get" : "set");
1144                 return -EINVAL;
1145         }
1146
1147         sym_buf = (char *)pi->purgatory_buf + sec->sh_offset + sym->st_value;
1148
1149         if (get_value)
1150                 memcpy((void *)buf, sym_buf, size);
1151         else
1152                 memcpy((void *)sym_buf, buf, size);
1153
1154         return 0;
1155 }
1156 #endif /* CONFIG_ARCH_HAS_KEXEC_PURGATORY */
1157
1158 int crash_exclude_mem_range(struct crash_mem *mem,
1159                             unsigned long long mstart, unsigned long long mend)
1160 {
1161         int i, j;
1162         unsigned long long start, end;
1163         struct crash_mem_range temp_range = {0, 0};
1164
1165         for (i = 0; i < mem->nr_ranges; i++) {
1166                 start = mem->ranges[i].start;
1167                 end = mem->ranges[i].end;
1168
1169                 if (mstart > end || mend < start)
1170                         continue;
1171
1172                 /* Truncate any area outside of range */
1173                 if (mstart < start)
1174                         mstart = start;
1175                 if (mend > end)
1176                         mend = end;
1177
1178                 /* Found completely overlapping range */
1179                 if (mstart == start && mend == end) {
1180                         mem->ranges[i].start = 0;
1181                         mem->ranges[i].end = 0;
1182                         if (i < mem->nr_ranges - 1) {
1183                                 /* Shift rest of the ranges to left */
1184                                 for (j = i; j < mem->nr_ranges - 1; j++) {
1185                                         mem->ranges[j].start =
1186                                                 mem->ranges[j+1].start;
1187                                         mem->ranges[j].end =
1188                                                         mem->ranges[j+1].end;
1189                                 }
1190                         }
1191                         mem->nr_ranges--;
1192                         return 0;
1193                 }
1194
1195                 if (mstart > start && mend < end) {
1196                         /* Split original range */
1197                         mem->ranges[i].end = mstart - 1;
1198                         temp_range.start = mend + 1;
1199                         temp_range.end = end;
1200                 } else if (mstart != start)
1201                         mem->ranges[i].end = mstart - 1;
1202                 else
1203                         mem->ranges[i].start = mend + 1;
1204                 break;
1205         }
1206
1207         /* If a split happened, add the split to array */
1208         if (!temp_range.end)
1209                 return 0;
1210
1211         /* Split happened */
1212         if (i == mem->max_nr_ranges - 1)
1213                 return -ENOMEM;
1214
1215         /* Location where new range should go */
1216         j = i + 1;
1217         if (j < mem->nr_ranges) {
1218                 /* Move over all ranges one slot towards the end */
1219                 for (i = mem->nr_ranges - 1; i >= j; i--)
1220                         mem->ranges[i + 1] = mem->ranges[i];
1221         }
1222
1223         mem->ranges[j].start = temp_range.start;
1224         mem->ranges[j].end = temp_range.end;
1225         mem->nr_ranges++;
1226         return 0;
1227 }
1228
1229 int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map,
1230                           void **addr, unsigned long *sz)
1231 {
1232         Elf64_Ehdr *ehdr;
1233         Elf64_Phdr *phdr;
1234         unsigned long nr_cpus = num_possible_cpus(), nr_phdr, elf_sz;
1235         unsigned char *buf;
1236         unsigned int cpu, i;
1237         unsigned long long notes_addr;
1238         unsigned long mstart, mend;
1239
1240         /* extra phdr for vmcoreinfo elf note */
1241         nr_phdr = nr_cpus + 1;
1242         nr_phdr += mem->nr_ranges;
1243
1244         /*
1245          * kexec-tools creates an extra PT_LOAD phdr for kernel text mapping
1246          * area (for example, ffffffff80000000 - ffffffffa0000000 on x86_64).
1247          * I think this is required by tools like gdb. So same physical
1248          * memory will be mapped in two elf headers. One will contain kernel
1249          * text virtual addresses and other will have __va(physical) addresses.
1250          */
1251
1252         nr_phdr++;
1253         elf_sz = sizeof(Elf64_Ehdr) + nr_phdr * sizeof(Elf64_Phdr);
1254         elf_sz = ALIGN(elf_sz, ELF_CORE_HEADER_ALIGN);
1255
1256         buf = vzalloc(elf_sz);
1257         if (!buf)
1258                 return -ENOMEM;
1259
1260         ehdr = (Elf64_Ehdr *)buf;
1261         phdr = (Elf64_Phdr *)(ehdr + 1);
1262         memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
1263         ehdr->e_ident[EI_CLASS] = ELFCLASS64;
1264         ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
1265         ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1266         ehdr->e_ident[EI_OSABI] = ELF_OSABI;
1267         memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD);
1268         ehdr->e_type = ET_CORE;
1269         ehdr->e_machine = ELF_ARCH;
1270         ehdr->e_version = EV_CURRENT;
1271         ehdr->e_phoff = sizeof(Elf64_Ehdr);
1272         ehdr->e_ehsize = sizeof(Elf64_Ehdr);
1273         ehdr->e_phentsize = sizeof(Elf64_Phdr);
1274
1275         /* Prepare one phdr of type PT_NOTE for each present cpu */
1276         for_each_present_cpu(cpu) {
1277                 phdr->p_type = PT_NOTE;
1278                 notes_addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpu));
1279                 phdr->p_offset = phdr->p_paddr = notes_addr;
1280                 phdr->p_filesz = phdr->p_memsz = sizeof(note_buf_t);
1281                 (ehdr->e_phnum)++;
1282                 phdr++;
1283         }
1284
1285         /* Prepare one PT_NOTE header for vmcoreinfo */
1286         phdr->p_type = PT_NOTE;
1287         phdr->p_offset = phdr->p_paddr = paddr_vmcoreinfo_note();
1288         phdr->p_filesz = phdr->p_memsz = VMCOREINFO_NOTE_SIZE;
1289         (ehdr->e_phnum)++;
1290         phdr++;
1291
1292         /* Prepare PT_LOAD type program header for kernel text region */
1293         if (kernel_map) {
1294                 phdr->p_type = PT_LOAD;
1295                 phdr->p_flags = PF_R|PF_W|PF_X;
1296                 phdr->p_vaddr = (Elf64_Addr)_text;
1297                 phdr->p_filesz = phdr->p_memsz = _end - _text;
1298                 phdr->p_offset = phdr->p_paddr = __pa_symbol(_text);
1299                 ehdr->e_phnum++;
1300                 phdr++;
1301         }
1302
1303         /* Go through all the ranges in mem->ranges[] and prepare phdr */
1304         for (i = 0; i < mem->nr_ranges; i++) {
1305                 mstart = mem->ranges[i].start;
1306                 mend = mem->ranges[i].end;
1307
1308                 phdr->p_type = PT_LOAD;
1309                 phdr->p_flags = PF_R|PF_W|PF_X;
1310                 phdr->p_offset  = mstart;
1311
1312                 phdr->p_paddr = mstart;
1313                 phdr->p_vaddr = (unsigned long long) __va(mstart);
1314                 phdr->p_filesz = phdr->p_memsz = mend - mstart + 1;
1315                 phdr->p_align = 0;
1316                 ehdr->e_phnum++;
1317                 phdr++;
1318                 pr_debug("Crash PT_LOAD elf header. phdr=%p vaddr=0x%llx, paddr=0x%llx, sz=0x%llx e_phnum=%d p_offset=0x%llx\n",
1319                         phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz,
1320                         ehdr->e_phnum, phdr->p_offset);
1321         }
1322
1323         *addr = buf;
1324         *sz = elf_sz;
1325         return 0;
1326 }