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                 /* If IMA is guaranteed to appraise a signature on the kexec
 212                  * image, permit it even if the kernel is otherwise locked
 213                  * down.
 214                  */
 215                 if (!ima_appraise_signature(READING_KEXEC_IMAGE) &&
 216                     security_locked_down(LOCKDOWN_KEXEC))
 217                         return -EPERM;
 218
 219                 return 0;
 220
 221                 /* All other errors are fatal, including nomem, unparseable
 222                  * signatures and signature check failures - even if signatures
 223                  * aren't required.
 224                  */
 225         default:
 226                 pr_notice("kernel signature verification failed (%d).\n", ret);
 227         }
 228
 229         return ret;
 230 }
 231 #endif
 232
 233 /*
 234  * In file mode list of segments is prepared by kernel. Copy relevant
 235  * data from user space, do error checking, prepare segment list
 236  */
 237 static int
 238 kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
 239                              const char __user *cmdline_ptr,
 240                              unsigned long cmdline_len, unsigned flags)
 241 {
 242         int ret;
 243         void *ldata;
 244         loff_t size;
 245
 246         ret = kernel_read_file_from_fd(kernel_fd, &image->kernel_buf,
 247                                        &size, INT_MAX, READING_KEXEC_IMAGE);
 248         if (ret)
 249                 return ret;
 250         image->kernel_buf_len = size;
 251
 252         /* Call arch image probe handlers */
 253         ret = arch_kexec_kernel_image_probe(image, image->kernel_buf,
 254                                             image->kernel_buf_len);
 255         if (ret)
 256                 goto out;
 257
 258 #ifdef CONFIG_KEXEC_SIG
 259         ret = kimage_validate_signature(image);
 260
 261         if (ret)
 262                 goto out;
 263 #endif
 264         /* It is possible that there no initramfs is being loaded */
 265         if (!(flags & KEXEC_FILE_NO_INITRAMFS)) {
 266                 ret = kernel_read_file_from_fd(initrd_fd, &image->initrd_buf,
 267                                                &size, INT_MAX,
 268                                                READING_KEXEC_INITRAMFS);
 269                 if (ret)
 270                         goto out;
 271                 image->initrd_buf_len = size;
 272         }
 273
 274         if (cmdline_len) {
 275                 image->cmdline_buf = memdup_user(cmdline_ptr, cmdline_len);
 276                 if (IS_ERR(image->cmdline_buf)) {
 277                         ret = PTR_ERR(image->cmdline_buf);
 278                         image->cmdline_buf = NULL;
 279                         goto out;
 280                 }
 281
 282                 image->cmdline_buf_len = cmdline_len;
 283
 284                 /* command line should be a string with last byte null */
 285                 if (image->cmdline_buf[cmdline_len - 1] != '\0') {
 286                         ret = -EINVAL;
 287                         goto out;
 288                 }
 289
 290                 ima_kexec_cmdline(image->cmdline_buf,
 291                                   image->cmdline_buf_len - 1);
 292         }
 293
 294         /* IMA needs to pass the measurement list to the next kernel. */
 295         ima_add_kexec_buffer(image);
 296
 297         /* Call arch image load handlers */
 298         ldata = arch_kexec_kernel_image_load(image);
 299
 300         if (IS_ERR(ldata)) {
 301                 ret = PTR_ERR(ldata);
 302                 goto out;
 303         }
 304
 305         image->image_loader_data = ldata;
 306 out:
 307         /* In case of error, free up all allocated memory in this function */
 308         if (ret)
 309                 kimage_file_post_load_cleanup(image);
 310         return ret;
 311 }
 312
 313 static int
 314 kimage_file_alloc_init(struct kimage **rimage, int kernel_fd,
 315                        int initrd_fd, const char __user *cmdline_ptr,
 316                        unsigned long cmdline_len, unsigned long flags)
 317 {
 318         int ret;
 319         struct kimage *image;
 320         bool kexec_on_panic = flags & KEXEC_FILE_ON_CRASH;
 321
 322         image = do_kimage_alloc_init();
 323         if (!image)
 324                 return -ENOMEM;
 325
 326         image->file_mode = 1;
 327
 328         if (kexec_on_panic) {
 329                 /* Enable special crash kernel control page alloc policy. */
 330                 image->control_page = crashk_res.start;
 331                 image->type = KEXEC_TYPE_CRASH;
 332         }
 333
 334         ret = kimage_file_prepare_segments(image, kernel_fd, initrd_fd,
 335                                            cmdline_ptr, cmdline_len, flags);
 336         if (ret)
 337                 goto out_free_image;
 338
 339         ret = sanity_check_segment_list(image);
 340         if (ret)
 341                 goto out_free_post_load_bufs;
 342
 343         ret = -ENOMEM;
 344         image->control_code_page = kimage_alloc_control_pages(image,
 345                                            get_order(KEXEC_CONTROL_PAGE_SIZE));
 346         if (!image->control_code_page) {
 347                 pr_err("Could not allocate control_code_buffer\n");
 348                 goto out_free_post_load_bufs;
 349         }
 350
 351         if (!kexec_on_panic) {
 352                 image->swap_page = kimage_alloc_control_pages(image, 0);
 353                 if (!image->swap_page) {
 354                         pr_err("Could not allocate swap buffer\n");
 355                         goto out_free_control_pages;
 356                 }
 357         }
 358
 359         *rimage = image;
 360         return 0;
 361 out_free_control_pages:
 362         kimage_free_page_list(&image->control_pages);
 363 out_free_post_load_bufs:
 364         kimage_file_post_load_cleanup(image);
 365 out_free_image:
 366         kfree(image);
 367         return ret;
 368 }
 369
 370 SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
 371                 unsigned long, cmdline_len, const char __user *, cmdline_ptr,
 372                 unsigned long, flags)
 373 {
 374         int ret = 0, i;
 375         struct kimage **dest_image, *image;
 376
 377         /* We only trust the superuser with rebooting the system. */
 378         if (!capable(CAP_SYS_BOOT) || kexec_load_disabled)
 379                 return -EPERM;
 380
 381         /* Make sure we have a legal set of flags */
 382         if (flags != (flags & KEXEC_FILE_FLAGS))
 383                 return -EINVAL;
 384
 385         image = NULL;
 386
 387         if (!mutex_trylock(&kexec_mutex))
 388                 return -EBUSY;
 389
 390         dest_image = &kexec_image;
 391         if (flags & KEXEC_FILE_ON_CRASH) {
 392                 dest_image = &kexec_crash_image;
 393                 if (kexec_crash_image)
 394                         arch_kexec_unprotect_crashkres();
 395         }
 396
 397         if (flags & KEXEC_FILE_UNLOAD)
 398                 goto exchange;
 399
 400         /*
 401          * In case of crash, new kernel gets loaded in reserved region. It is
 402          * same memory where old crash kernel might be loaded. Free any
 403          * current crash dump kernel before we corrupt it.
 404          */
 405         if (flags & KEXEC_FILE_ON_CRASH)
 406                 kimage_free(xchg(&kexec_crash_image, NULL));
 407
 408         ret = kimage_file_alloc_init(&image, kernel_fd, initrd_fd, cmdline_ptr,
 409                                      cmdline_len, flags);
 410         if (ret)
 411                 goto out;
 412
 413         ret = machine_kexec_prepare(image);
 414         if (ret)
 415                 goto out;
 416
 417         /*
 418          * Some architecture(like S390) may touch the crash memory before
 419          * machine_kexec_prepare(), we must copy vmcoreinfo data after it.
 420          */
 421         ret = kimage_crash_copy_vmcoreinfo(image);
 422         if (ret)
 423                 goto out;
 424
 425         ret = kexec_calculate_store_digests(image);
 426         if (ret)
 427                 goto out;
 428
 429         for (i = 0; i < image->nr_segments; i++) {
 430                 struct kexec_segment *ksegment;
 431
 432                 ksegment = &image->segment[i];
 433                 pr_debug("Loading segment %d: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
 434                          i, ksegment->buf, ksegment->bufsz, ksegment->mem,
 435                          ksegment->memsz);
 436
 437                 ret = kimage_load_segment(image, &image->segment[i]);
 438                 if (ret)
 439                         goto out;
 440         }
 441
 442         kimage_terminate(image);
 443
 444         ret = machine_kexec_post_load(image);
 445         if (ret)
 446                 goto out;
 447
 448         /*
 449          * Free up any temporary buffers allocated which are not needed
 450          * after image has been loaded
 451          */
 452         kimage_file_post_load_cleanup(image);
 453 exchange:
 454         image = xchg(dest_image, image);
 455 out:
 456         if ((flags & KEXEC_FILE_ON_CRASH) && kexec_crash_image)
 457                 arch_kexec_protect_crashkres();
 458
 459         mutex_unlock(&kexec_mutex);
 460         kimage_free(image);
 461         return ret;
 462 }
 463
 464 static int locate_mem_hole_top_down(unsigned long start, unsigned long end,
 465                                     struct kexec_buf *kbuf)
 466 {
 467         struct kimage *image = kbuf->image;
 468         unsigned long temp_start, temp_end;
 469
 470         temp_end = min(end, kbuf->buf_max);
 471         temp_start = temp_end - kbuf->memsz;
 472
 473         do {
 474                 /* align down start */
 475                 temp_start = temp_start & (~(kbuf->buf_align - 1));
 476
 477                 if (temp_start < start || temp_start < kbuf->buf_min)
 478                         return 0;
 479
 480                 temp_end = temp_start + kbuf->memsz - 1;
 481
 482                 /*
 483                  * Make sure this does not conflict with any of existing
 484                  * segments
 485                  */
 486                 if (kimage_is_destination_range(image, temp_start, temp_end)) {
 487                         temp_start = temp_start - PAGE_SIZE;
 488                         continue;
 489                 }
 490
 491                 /* We found a suitable memory range */
 492                 break;
 493         } while (1);
 494
 495         /* If we are here, we found a suitable memory range */
 496         kbuf->mem = temp_start;
 497
 498         /* Success, stop navigating through remaining System RAM ranges */
 499         return 1;
 500 }
 501
 502 static int locate_mem_hole_bottom_up(unsigned long start, unsigned long end,
 503                                      struct kexec_buf *kbuf)
 504 {
 505         struct kimage *image = kbuf->image;
 506         unsigned long temp_start, temp_end;
 507
 508         temp_start = max(start, kbuf->buf_min);
 509
 510         do {
 511                 temp_start = ALIGN(temp_start, kbuf->buf_align);
 512                 temp_end = temp_start + kbuf->memsz - 1;
 513
 514                 if (temp_end > end || temp_end > kbuf->buf_max)
 515                         return 0;
 516                 /*
 517                  * Make sure this does not conflict with any of existing
 518                  * segments
 519                  */
 520                 if (kimage_is_destination_range(image, temp_start, temp_end)) {
 521                         temp_start = temp_start + PAGE_SIZE;
 522                         continue;
 523                 }
 524
 525                 /* We found a suitable memory range */
 526                 break;
 527         } while (1);
 528
 529         /* If we are here, we found a suitable memory range */
 530         kbuf->mem = temp_start;
 531
 532         /* Success, stop navigating through remaining System RAM ranges */
 533         return 1;
 534 }
 535
 536 static int locate_mem_hole_callback(struct resource *res, void *arg)
 537 {
 538         struct kexec_buf *kbuf = (struct kexec_buf *)arg;
 539         u64 start = res->start, end = res->end;
 540         unsigned long sz = end - start + 1;
 541
 542         /* Returning 0 will take to next memory range */
 543         if (sz < kbuf->memsz)
 544                 return 0;
 545
 546         if (end < kbuf->buf_min || start > kbuf->buf_max)
 547                 return 0;
 548
 549         /*
 550          * Allocate memory top down with-in ram range. Otherwise bottom up
 551          * allocation.
 552          */
 553         if (kbuf->top_down)
 554                 return locate_mem_hole_top_down(start, end, kbuf);
 555         return locate_mem_hole_bottom_up(start, end, kbuf);
 556 }
 557
 558 #ifdef CONFIG_ARCH_KEEP_MEMBLOCK
 559 static int kexec_walk_memblock(struct kexec_buf *kbuf,
 560                                int (*func)(struct resource *, void *))
 561 {
 562         int ret = 0;
 563         u64 i;
 564         phys_addr_t mstart, mend;
 565         struct resource res = { };
 566
 567         if (kbuf->image->type == KEXEC_TYPE_CRASH)
 568                 return func(&crashk_res, kbuf);
 569
 570         if (kbuf->top_down) {
 571                 for_each_free_mem_range_reverse(i, NUMA_NO_NODE, MEMBLOCK_NONE,
 572                                                 &mstart, &mend, NULL) {
 573                         /*
 574                          * In memblock, end points to the first byte after the
 575                          * range while in kexec, end points to the last byte
 576                          * in the range.
 577                          */
 578                         res.start = mstart;
 579                         res.end = mend - 1;
 580                         ret = func(&res, kbuf);
 581                         if (ret)
 582                                 break;
 583                 }
 584         } else {
 585                 for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE,
 586                                         &mstart, &mend, NULL) {
 587                         /*
 588                          * In memblock, end points to the first byte after the
 589                          * range while in kexec, end points to the last byte
 590                          * in the range.
 591                          */
 592                         res.start = mstart;
 593                         res.end = mend - 1;
 594                         ret = func(&res, kbuf);
 595                         if (ret)
 596                                 break;
 597                 }
 598         }
 599
 600         return ret;
 601 }
 602 #else
 603 static int kexec_walk_memblock(struct kexec_buf *kbuf,
 604                                int (*func)(struct resource *, void *))
 605 {
 606         return 0;
 607 }
 608 #endif
 609
 610 /**
 611  * kexec_walk_resources - call func(data) on free memory regions
 612  * @kbuf:       Context info for the search. Also passed to @func.
 613  * @func:       Function to call for each memory region.
 614  *
 615  * Return: The memory walk will stop when func returns a non-zero value
 616  * and that value will be returned. If all free regions are visited without
 617  * func returning non-zero, then zero will be returned.
 618  */
 619 static int kexec_walk_resources(struct kexec_buf *kbuf,
 620                                 int (*func)(struct resource *, void *))
 621 {
 622         if (kbuf->image->type == KEXEC_TYPE_CRASH)
 623                 return walk_iomem_res_desc(crashk_res.desc,
 624                                            IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY,
 625                                            crashk_res.start, crashk_res.end,
 626                                            kbuf, func);
 627         else
 628                 return walk_system_ram_res(0, ULONG_MAX, kbuf, func);
 629 }
 630
 631 /**
 632  * kexec_locate_mem_hole - find free memory for the purgatory or the next kernel
 633  * @kbuf:       Parameters for the memory search.
 634  *
 635  * On success, kbuf->mem will have the start address of the memory region found.
 636  *
 637  * Return: 0 on success, negative errno on error.
 638  */
 639 int kexec_locate_mem_hole(struct kexec_buf *kbuf)
 640 {
 641         int ret;
 642
 643         /* Arch knows where to place */
 644         if (kbuf->mem != KEXEC_BUF_MEM_UNKNOWN)
 645                 return 0;
 646
 647         if (!IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK))
 648                 ret = kexec_walk_resources(kbuf, locate_mem_hole_callback);
 649         else
 650                 ret = kexec_walk_memblock(kbuf, locate_mem_hole_callback);
 651
 652         return ret == 1 ? 0 : -EADDRNOTAVAIL;
 653 }
 654
 655 /**
 656  * kexec_add_buffer - place a buffer in a kexec segment
 657  * @kbuf:       Buffer contents and memory parameters.
 658  *
 659  * This function assumes that kexec_mutex is held.
 660  * On successful return, @kbuf->mem will have the physical address of
 661  * the buffer in memory.
 662  *
 663  * Return: 0 on success, negative errno on error.
 664  */
 665 int kexec_add_buffer(struct kexec_buf *kbuf)
 666 {
 667
 668         struct kexec_segment *ksegment;
 669         int ret;
 670
 671         /* Currently adding segment this way is allowed only in file mode */
 672         if (!kbuf->image->file_mode)
 673                 return -EINVAL;
 674
 675         if (kbuf->image->nr_segments >= KEXEC_SEGMENT_MAX)
 676                 return -EINVAL;
 677
 678         /*
 679          * Make sure we are not trying to add buffer after allocating
 680          * control pages. All segments need to be placed first before
 681          * any control pages are allocated. As control page allocation
 682          * logic goes through list of segments to make sure there are
 683          * no destination overlaps.
 684          */
 685         if (!list_empty(&kbuf->image->control_pages)) {
 686                 WARN_ON(1);
 687                 return -EINVAL;
 688         }
 689
 690         /* Ensure minimum alignment needed for segments. */
 691         kbuf->memsz = ALIGN(kbuf->memsz, PAGE_SIZE);
 692         kbuf->buf_align = max(kbuf->buf_align, PAGE_SIZE);
 693
 694         /* Walk the RAM ranges and allocate a suitable range for the buffer */
 695         ret = kexec_locate_mem_hole(kbuf);
 696         if (ret)
 697                 return ret;
 698
 699         /* Found a suitable memory range */
 700         ksegment = &kbuf->image->segment[kbuf->image->nr_segments];
 701         ksegment->kbuf = kbuf->buffer;
 702         ksegment->bufsz = kbuf->bufsz;
 703         ksegment->mem = kbuf->mem;
 704         ksegment->memsz = kbuf->memsz;
 705         kbuf->image->nr_segments++;
 706         return 0;
 707 }
 708
 709 /* Calculate and store the digest of segments */
 710 static int kexec_calculate_store_digests(struct kimage *image)
 711 {
 712         struct crypto_shash *tfm;
 713         struct shash_desc *desc;
 714         int ret = 0, i, j, zero_buf_sz, sha_region_sz;
 715         size_t desc_size, nullsz;
 716         char *digest;
 717         void *zero_buf;
 718         struct kexec_sha_region *sha_regions;
 719         struct purgatory_info *pi = &image->purgatory_info;
 720
 721         if (!IS_ENABLED(CONFIG_ARCH_HAS_KEXEC_PURGATORY))
 722                 return 0;
 723
 724         zero_buf = __va(page_to_pfn(ZERO_PAGE(0)) << PAGE_SHIFT);
 725         zero_buf_sz = PAGE_SIZE;
 726
 727         tfm = crypto_alloc_shash("sha256", 0, 0);
 728         if (IS_ERR(tfm)) {
 729                 ret = PTR_ERR(tfm);
 730                 goto out;
 731         }
 732
 733         desc_size = crypto_shash_descsize(tfm) + sizeof(*desc);
 734         desc = kzalloc(desc_size, GFP_KERNEL);
 735         if (!desc) {
 736                 ret = -ENOMEM;
 737                 goto out_free_tfm;
 738         }
 739
 740         sha_region_sz = KEXEC_SEGMENT_MAX * sizeof(struct kexec_sha_region);
 741         sha_regions = vzalloc(sha_region_sz);
 742         if (!sha_regions)
 743                 goto out_free_desc;
 744
 745         desc->tfm   = tfm;
 746
 747         ret = crypto_shash_init(desc);
 748         if (ret < 0)
 749                 goto out_free_sha_regions;
 750
 751         digest = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);
 752         if (!digest) {
 753                 ret = -ENOMEM;
 754                 goto out_free_sha_regions;
 755         }
 756
 757         for (j = i = 0; i < image->nr_segments; i++) {
 758                 struct kexec_segment *ksegment;
 759
 760                 ksegment = &image->segment[i];
 761                 /*
 762                  * Skip purgatory as it will be modified once we put digest
 763                  * info in purgatory.
 764                  */
 765                 if (ksegment->kbuf == pi->purgatory_buf)
 766                         continue;
 767
 768                 ret = crypto_shash_update(desc, ksegment->kbuf,
 769                                           ksegment->bufsz);
 770                 if (ret)
 771                         break;
 772
 773                 /*
 774                  * Assume rest of the buffer is filled with zero and
 775                  * update digest accordingly.
 776                  */
 777                 nullsz = ksegment->memsz - ksegment->bufsz;
 778                 while (nullsz) {
 779                         unsigned long bytes = nullsz;
 780
 781                         if (bytes > zero_buf_sz)
 782                                 bytes = zero_buf_sz;
 783                         ret = crypto_shash_update(desc, zero_buf, bytes);
 784                         if (ret)
 785                                 break;
 786                         nullsz -= bytes;
 787                 }
 788
 789                 if (ret)
 790                         break;
 791
 792                 sha_regions[j].start = ksegment->mem;
 793                 sha_regions[j].len = ksegment->memsz;
 794                 j++;
 795         }
 796
 797         if (!ret) {
 798                 ret = crypto_shash_final(desc, digest);
 799                 if (ret)
 800                         goto out_free_digest;
 801                 ret = kexec_purgatory_get_set_symbol(image, "purgatory_sha_regions",
 802                                                      sha_regions, sha_region_sz, 0);
 803                 if (ret)
 804                         goto out_free_digest;
 805
 806                 ret = kexec_purgatory_get_set_symbol(image, "purgatory_sha256_digest",
 807                                                      digest, SHA256_DIGEST_SIZE, 0);
 808                 if (ret)
 809                         goto out_free_digest;
 810         }
 811
 812 out_free_digest:
 813         kfree(digest);
 814 out_free_sha_regions:
 815         vfree(sha_regions);
 816 out_free_desc:
 817         kfree(desc);
 818 out_free_tfm:
 819         kfree(tfm);
 820 out:
 821         return ret;
 822 }
 823
 824 #ifdef CONFIG_ARCH_HAS_KEXEC_PURGATORY
 825 /*
 826  * kexec_purgatory_setup_kbuf - prepare buffer to load purgatory.
 827  * @pi:         Purgatory to be loaded.
 828  * @kbuf:       Buffer to setup.
 829  *
 830  * Allocates the memory needed for the buffer. Caller is responsible to free
 831  * the memory after use.
 832  *
 833  * Return: 0 on success, negative errno on error.
 834  */
 835 static int kexec_purgatory_setup_kbuf(struct purgatory_info *pi,
 836                                       struct kexec_buf *kbuf)
 837 {
 838         const Elf_Shdr *sechdrs;
 839         unsigned long bss_align;
 840         unsigned long bss_sz;
 841         unsigned long align;
 842         int i, ret;
 843
 844         sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff;
 845         kbuf->buf_align = bss_align = 1;
 846         kbuf->bufsz = bss_sz = 0;
 847
 848         for (i = 0; i < pi->ehdr->e_shnum; i++) {
 849                 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
 850                         continue;
 851
 852                 align = sechdrs[i].sh_addralign;
 853                 if (sechdrs[i].sh_type != SHT_NOBITS) {
 854                         if (kbuf->buf_align < align)
 855                                 kbuf->buf_align = align;
 856                         kbuf->bufsz = ALIGN(kbuf->bufsz, align);
 857                         kbuf->bufsz += sechdrs[i].sh_size;
 858                 } else {
 859                         if (bss_align < align)
 860                                 bss_align = align;
 861                         bss_sz = ALIGN(bss_sz, align);
 862                         bss_sz += sechdrs[i].sh_size;
 863                 }
 864         }
 865         kbuf->bufsz = ALIGN(kbuf->bufsz, bss_align);
 866         kbuf->memsz = kbuf->bufsz + bss_sz;
 867         if (kbuf->buf_align < bss_align)
 868                 kbuf->buf_align = bss_align;
 869
 870         kbuf->buffer = vzalloc(kbuf->bufsz);
 871         if (!kbuf->buffer)
 872                 return -ENOMEM;
 873         pi->purgatory_buf = kbuf->buffer;
 874
 875         ret = kexec_add_buffer(kbuf);
 876         if (ret)
 877                 goto out;
 878
 879         return 0;
 880 out:
 881         vfree(pi->purgatory_buf);
 882         pi->purgatory_buf = NULL;
 883         return ret;
 884 }
 885
 886 /*
 887  * kexec_purgatory_setup_sechdrs - prepares the pi->sechdrs buffer.
 888  * @pi:         Purgatory to be loaded.
 889  * @kbuf:       Buffer prepared to store purgatory.
 890  *
 891  * Allocates the memory needed for the buffer. Caller is responsible to free
 892  * the memory after use.
 893  *
 894  * Return: 0 on success, negative errno on error.
 895  */
 896 static int kexec_purgatory_setup_sechdrs(struct purgatory_info *pi,
 897                                          struct kexec_buf *kbuf)
 898 {
 899         unsigned long bss_addr;
 900         unsigned long offset;
 901         Elf_Shdr *sechdrs;
 902         int i;
 903
 904         /*
 905          * The section headers in kexec_purgatory are read-only. In order to
 906          * have them modifiable make a temporary copy.
 907          */
 908         sechdrs = vzalloc(array_size(sizeof(Elf_Shdr), pi->ehdr->e_shnum));
 909         if (!sechdrs)
 910                 return -ENOMEM;
 911         memcpy(sechdrs, (void *)pi->ehdr + pi->ehdr->e_shoff,
 912                pi->ehdr->e_shnum * sizeof(Elf_Shdr));
 913         pi->sechdrs = sechdrs;
 914
 915         offset = 0;
 916         bss_addr = kbuf->mem + kbuf->bufsz;
 917         kbuf->image->start = pi->ehdr->e_entry;
 918
 919         for (i = 0; i < pi->ehdr->e_shnum; i++) {
 920                 unsigned long align;
 921                 void *src, *dst;
 922
 923                 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
 924                         continue;
 925
 926                 align = sechdrs[i].sh_addralign;
 927                 if (sechdrs[i].sh_type == SHT_NOBITS) {
 928                         bss_addr = ALIGN(bss_addr, align);
 929                         sechdrs[i].sh_addr = bss_addr;
 930                         bss_addr += sechdrs[i].sh_size;
 931                         continue;
 932                 }
 933
 934                 offset = ALIGN(offset, align);
 935                 if (sechdrs[i].sh_flags & SHF_EXECINSTR &&
 936                     pi->ehdr->e_entry >= sechdrs[i].sh_addr &&
 937                     pi->ehdr->e_entry < (sechdrs[i].sh_addr
 938                                          + sechdrs[i].sh_size)) {
 939                         kbuf->image->start -= sechdrs[i].sh_addr;
 940                         kbuf->image->start += kbuf->mem + offset;
 941                 }
 942
 943                 src = (void *)pi->ehdr + sechdrs[i].sh_offset;
 944                 dst = pi->purgatory_buf + offset;
 945                 memcpy(dst, src, sechdrs[i].sh_size);
 946
 947                 sechdrs[i].sh_addr = kbuf->mem + offset;
 948                 sechdrs[i].sh_offset = offset;
 949                 offset += sechdrs[i].sh_size;
 950         }
 951
 952         return 0;
 953 }
 954
 955 static int kexec_apply_relocations(struct kimage *image)
 956 {
 957         int i, ret;
 958         struct purgatory_info *pi = &image->purgatory_info;
 959         const Elf_Shdr *sechdrs;
 960
 961         sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff;
 962
 963         for (i = 0; i < pi->ehdr->e_shnum; i++) {
 964                 const Elf_Shdr *relsec;
 965                 const Elf_Shdr *symtab;
 966                 Elf_Shdr *section;
 967
 968                 relsec = sechdrs + i;
 969
 970                 if (relsec->sh_type != SHT_RELA &&
 971                     relsec->sh_type != SHT_REL)
 972                         continue;
 973
 974                 /*
 975                  * For section of type SHT_RELA/SHT_REL,
 976                  * ->sh_link contains section header index of associated
 977                  * symbol table. And ->sh_info contains section header
 978                  * index of section to which relocations apply.
 979                  */
 980                 if (relsec->sh_info >= pi->ehdr->e_shnum ||
 981                     relsec->sh_link >= pi->ehdr->e_shnum)
 982                         return -ENOEXEC;
 983
 984                 section = pi->sechdrs + relsec->sh_info;
 985                 symtab = sechdrs + relsec->sh_link;
 986
 987                 if (!(section->sh_flags & SHF_ALLOC))
 988                         continue;
 989
 990                 /*
 991                  * symtab->sh_link contain section header index of associated
 992                  * string table.
 993                  */
 994                 if (symtab->sh_link >= pi->ehdr->e_shnum)
 995                         /* Invalid section number? */
 996                         continue;
 997
 998                 /*
 999                  * Respective architecture needs to provide support for applying
1000                  * relocations of type SHT_RELA/SHT_REL.
1001                  */
1002                 if (relsec->sh_type == SHT_RELA)
1003                         ret = arch_kexec_apply_relocations_add(pi, section,
1004                                                                relsec, symtab);
1005                 else if (relsec->sh_type == SHT_REL)
1006                         ret = arch_kexec_apply_relocations(pi, section,
1007                                                            relsec, symtab);
1008                 if (ret)
1009                         return ret;
1010         }
1011
1012         return 0;
1013 }
1014
1015 /*
1016  * kexec_load_purgatory - Load and relocate the purgatory object.
1017  * @image:      Image to add the purgatory to.
1018  * @kbuf:       Memory parameters to use.
1019  *
1020  * Allocates the memory needed for image->purgatory_info.sechdrs and
1021  * image->purgatory_info.purgatory_buf/kbuf->buffer. Caller is responsible
1022  * to free the memory after use.
1023  *
1024  * Return: 0 on success, negative errno on error.
1025  */
1026 int kexec_load_purgatory(struct kimage *image, struct kexec_buf *kbuf)
1027 {
1028         struct purgatory_info *pi = &image->purgatory_info;
1029         int ret;
1030
1031         if (kexec_purgatory_size <= 0)
1032                 return -EINVAL;
1033
1034         pi->ehdr = (const Elf_Ehdr *)kexec_purgatory;
1035
1036         ret = kexec_purgatory_setup_kbuf(pi, kbuf);
1037         if (ret)
1038                 return ret;
1039
1040         ret = kexec_purgatory_setup_sechdrs(pi, kbuf);
1041         if (ret)
1042                 goto out_free_kbuf;
1043
1044         ret = kexec_apply_relocations(image);
1045         if (ret)
1046                 goto out;
1047
1048         return 0;
1049 out:
1050         vfree(pi->sechdrs);
1051         pi->sechdrs = NULL;
1052 out_free_kbuf:
1053         vfree(pi->purgatory_buf);
1054         pi->purgatory_buf = NULL;
1055         return ret;
1056 }
1057
1058 /*
1059  * kexec_purgatory_find_symbol - find a symbol in the purgatory
1060  * @pi:         Purgatory to search in.
1061  * @name:       Name of the symbol.
1062  *
1063  * Return: pointer to symbol in read-only symtab on success, NULL on error.
1064  */
1065 static const Elf_Sym *kexec_purgatory_find_symbol(struct purgatory_info *pi,
1066                                                   const char *name)
1067 {
1068         const Elf_Shdr *sechdrs;
1069         const Elf_Ehdr *ehdr;
1070         const Elf_Sym *syms;
1071         const char *strtab;
1072         int i, k;
1073
1074         if (!pi->ehdr)
1075                 return NULL;
1076
1077         ehdr = pi->ehdr;
1078         sechdrs = (void *)ehdr + ehdr->e_shoff;
1079
1080         for (i = 0; i < ehdr->e_shnum; i++) {
1081                 if (sechdrs[i].sh_type != SHT_SYMTAB)
1082                         continue;
1083
1084                 if (sechdrs[i].sh_link >= ehdr->e_shnum)
1085                         /* Invalid strtab section number */
1086                         continue;
1087                 strtab = (void *)ehdr + sechdrs[sechdrs[i].sh_link].sh_offset;
1088                 syms = (void *)ehdr + sechdrs[i].sh_offset;
1089
1090                 /* Go through symbols for a match */
1091                 for (k = 0; k < sechdrs[i].sh_size/sizeof(Elf_Sym); k++) {
1092                         if (ELF_ST_BIND(syms[k].st_info) != STB_GLOBAL)
1093                                 continue;
1094
1095                         if (strcmp(strtab + syms[k].st_name, name) != 0)
1096                                 continue;
1097
1098                         if (syms[k].st_shndx == SHN_UNDEF ||
1099                             syms[k].st_shndx >= ehdr->e_shnum) {
1100                                 pr_debug("Symbol: %s has bad section index %d.\n",
1101                                                 name, syms[k].st_shndx);
1102                                 return NULL;
1103                         }
1104
1105                         /* Found the symbol we are looking for */
1106                         return &syms[k];
1107                 }
1108         }
1109
1110         return NULL;
1111 }
1112
1113 void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name)
1114 {
1115         struct purgatory_info *pi = &image->purgatory_info;
1116         const Elf_Sym *sym;
1117         Elf_Shdr *sechdr;
1118
1119         sym = kexec_purgatory_find_symbol(pi, name);
1120         if (!sym)
1121                 return ERR_PTR(-EINVAL);
1122
1123         sechdr = &pi->sechdrs[sym->st_shndx];
1124
1125         /*
1126          * Returns the address where symbol will finally be loaded after
1127          * kexec_load_segment()
1128          */
1129         return (void *)(sechdr->sh_addr + sym->st_value);
1130 }
1131
1132 /*
1133  * Get or set value of a symbol. If "get_value" is true, symbol value is
1134  * returned in buf otherwise symbol value is set based on value in buf.
1135  */
1136 int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name,
1137                                    void *buf, unsigned int size, bool get_value)
1138 {
1139         struct purgatory_info *pi = &image->purgatory_info;
1140         const Elf_Sym *sym;
1141         Elf_Shdr *sec;
1142         char *sym_buf;
1143
1144         sym = kexec_purgatory_find_symbol(pi, name);
1145         if (!sym)
1146                 return -EINVAL;
1147
1148         if (sym->st_size != size) {
1149                 pr_err("symbol %s size mismatch: expected %lu actual %u\n",
1150                        name, (unsigned long)sym->st_size, size);
1151                 return -EINVAL;
1152         }
1153
1154         sec = pi->sechdrs + sym->st_shndx;
1155
1156         if (sec->sh_type == SHT_NOBITS) {
1157                 pr_err("symbol %s is in a bss section. Cannot %s\n", name,
1158                        get_value ? "get" : "set");
1159                 return -EINVAL;
1160         }
1161
1162         sym_buf = (char *)pi->purgatory_buf + sec->sh_offset + sym->st_value;
1163
1164         if (get_value)
1165                 memcpy((void *)buf, sym_buf, size);
1166         else
1167                 memcpy((void *)sym_buf, buf, size);
1168
1169         return 0;
1170 }
1171 #endif /* CONFIG_ARCH_HAS_KEXEC_PURGATORY */
1172
1173 int crash_exclude_mem_range(struct crash_mem *mem,
1174                             unsigned long long mstart, unsigned long long mend)
1175 {
1176         int i, j;
1177         unsigned long long start, end;
1178         struct crash_mem_range temp_range = {0, 0};
1179
1180         for (i = 0; i < mem->nr_ranges; i++) {
1181                 start = mem->ranges[i].start;
1182                 end = mem->ranges[i].end;
1183
1184                 if (mstart > end || mend < start)
1185                         continue;
1186
1187                 /* Truncate any area outside of range */
1188                 if (mstart < start)
1189                         mstart = start;
1190                 if (mend > end)
1191                         mend = end;
1192
1193                 /* Found completely overlapping range */
1194                 if (mstart == start && mend == end) {
1195                         mem->ranges[i].start = 0;
1196                         mem->ranges[i].end = 0;
1197                         if (i < mem->nr_ranges - 1) {
1198                                 /* Shift rest of the ranges to left */
1199                                 for (j = i; j < mem->nr_ranges - 1; j++) {
1200                                         mem->ranges[j].start =
1201                                                 mem->ranges[j+1].start;
1202                                         mem->ranges[j].end =
1203                                                         mem->ranges[j+1].end;
1204                                 }
1205                         }
1206                         mem->nr_ranges--;
1207                         return 0;
1208                 }
1209
1210                 if (mstart > start && mend < end) {
1211                         /* Split original range */
1212                         mem->ranges[i].end = mstart - 1;
1213                         temp_range.start = mend + 1;
1214                         temp_range.end = end;
1215                 } else if (mstart != start)
1216                         mem->ranges[i].end = mstart - 1;
1217                 else
1218                         mem->ranges[i].start = mend + 1;
1219                 break;
1220         }
1221
1222         /* If a split happened, add the split to array */
1223         if (!temp_range.end)
1224                 return 0;
1225
1226         /* Split happened */
1227         if (i == mem->max_nr_ranges - 1)
1228                 return -ENOMEM;
1229
1230         /* Location where new range should go */
1231         j = i + 1;
1232         if (j < mem->nr_ranges) {
1233                 /* Move over all ranges one slot towards the end */
1234                 for (i = mem->nr_ranges - 1; i >= j; i--)
1235                         mem->ranges[i + 1] = mem->ranges[i];
1236         }
1237
1238         mem->ranges[j].start = temp_range.start;
1239         mem->ranges[j].end = temp_range.end;
1240         mem->nr_ranges++;
1241         return 0;
1242 }
1243
1244 int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map,
1245                           void **addr, unsigned long *sz)
1246 {
1247         Elf64_Ehdr *ehdr;
1248         Elf64_Phdr *phdr;
1249         unsigned long nr_cpus = num_possible_cpus(), nr_phdr, elf_sz;
1250         unsigned char *buf;
1251         unsigned int cpu, i;
1252         unsigned long long notes_addr;
1253         unsigned long mstart, mend;
1254
1255         /* extra phdr for vmcoreinfo elf note */
1256         nr_phdr = nr_cpus + 1;
1257         nr_phdr += mem->nr_ranges;
1258
1259         /*
1260          * kexec-tools creates an extra PT_LOAD phdr for kernel text mapping
1261          * area (for example, ffffffff80000000 - ffffffffa0000000 on x86_64).
1262          * I think this is required by tools like gdb. So same physical
1263          * memory will be mapped in two elf headers. One will contain kernel
1264          * text virtual addresses and other will have __va(physical) addresses.
1265          */
1266
1267         nr_phdr++;
1268         elf_sz = sizeof(Elf64_Ehdr) + nr_phdr * sizeof(Elf64_Phdr);
1269         elf_sz = ALIGN(elf_sz, ELF_CORE_HEADER_ALIGN);
1270
1271         buf = vzalloc(elf_sz);
1272         if (!buf)
1273                 return -ENOMEM;
1274
1275         ehdr = (Elf64_Ehdr *)buf;
1276         phdr = (Elf64_Phdr *)(ehdr + 1);
1277         memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
1278         ehdr->e_ident[EI_CLASS] = ELFCLASS64;
1279         ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
1280         ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1281         ehdr->e_ident[EI_OSABI] = ELF_OSABI;
1282         memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD);
1283         ehdr->e_type = ET_CORE;
1284         ehdr->e_machine = ELF_ARCH;
1285         ehdr->e_version = EV_CURRENT;
1286         ehdr->e_phoff = sizeof(Elf64_Ehdr);
1287         ehdr->e_ehsize = sizeof(Elf64_Ehdr);
1288         ehdr->e_phentsize = sizeof(Elf64_Phdr);
1289
1290         /* Prepare one phdr of type PT_NOTE for each present cpu */
1291         for_each_present_cpu(cpu) {
1292                 phdr->p_type = PT_NOTE;
1293                 notes_addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpu));
1294                 phdr->p_offset = phdr->p_paddr = notes_addr;
1295                 phdr->p_filesz = phdr->p_memsz = sizeof(note_buf_t);
1296                 (ehdr->e_phnum)++;
1297                 phdr++;
1298         }
1299
1300         /* Prepare one PT_NOTE header for vmcoreinfo */
1301         phdr->p_type = PT_NOTE;
1302         phdr->p_offset = phdr->p_paddr = paddr_vmcoreinfo_note();
1303         phdr->p_filesz = phdr->p_memsz = VMCOREINFO_NOTE_SIZE;
1304         (ehdr->e_phnum)++;
1305         phdr++;
1306
1307         /* Prepare PT_LOAD type program header for kernel text region */
1308         if (kernel_map) {
1309                 phdr->p_type = PT_LOAD;
1310                 phdr->p_flags = PF_R|PF_W|PF_X;
1311                 phdr->p_vaddr = (unsigned long) _text;
1312                 phdr->p_filesz = phdr->p_memsz = _end - _text;
1313                 phdr->p_offset = phdr->p_paddr = __pa_symbol(_text);
1314                 ehdr->e_phnum++;
1315                 phdr++;
1316         }
1317
1318         /* Go through all the ranges in mem->ranges[] and prepare phdr */
1319         for (i = 0; i < mem->nr_ranges; i++) {
1320                 mstart = mem->ranges[i].start;
1321                 mend = mem->ranges[i].end;
1322
1323                 phdr->p_type = PT_LOAD;
1324                 phdr->p_flags = PF_R|PF_W|PF_X;
1325                 phdr->p_offset  = mstart;
1326
1327                 phdr->p_paddr = mstart;
1328                 phdr->p_vaddr = (unsigned long) __va(mstart);
1329                 phdr->p_filesz = phdr->p_memsz = mend - mstart + 1;
1330                 phdr->p_align = 0;
1331                 ehdr->e_phnum++;
1332                 phdr++;
1333                 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",
1334                         phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz,
1335                         ehdr->e_phnum, phdr->p_offset);
1336         }
1337
1338         *addr = buf;
1339         *sz = elf_sz;
1340         return 0;
1341 }