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/sha2.h>
  24 #include <linux/elf.h>
  25 #include <linux/elfcore.h>
  26 #include <linux/kernel.h>
  27 #include <linux/kernel_read_file.h>
  28 #include <linux/syscalls.h>
  29 #include <linux/vmalloc.h>
  30 #include "kexec_internal.h"
  31
  32 static int kexec_calculate_store_digests(struct kimage *image);
  33
  34 /*
  35  * Currently this is the only default function that is exported as some
  36  * architectures need it to do additional handlings.
  37  * In the future, other default functions may be exported too if required.
  38  */
  39 int kexec_image_probe_default(struct kimage *image, void *buf,
  40                               unsigned long buf_len)
  41 {
  42         const struct kexec_file_ops * const *fops;
  43         int ret = -ENOEXEC;
  44
  45         for (fops = &kexec_file_loaders[0]; *fops && (*fops)->probe; ++fops) {
  46                 ret = (*fops)->probe(buf, buf_len);
  47                 if (!ret) {
  48                         image->fops = *fops;
  49                         return ret;
  50                 }
  51         }
  52
  53         return ret;
  54 }
  55
  56 /* Architectures can provide this probe function */
  57 int __weak arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
  58                                          unsigned long buf_len)
  59 {
  60         return kexec_image_probe_default(image, buf, buf_len);
  61 }
  62
  63 static void *kexec_image_load_default(struct kimage *image)
  64 {
  65         if (!image->fops || !image->fops->load)
  66                 return ERR_PTR(-ENOEXEC);
  67
  68         return image->fops->load(image, image->kernel_buf,
  69                                  image->kernel_buf_len, image->initrd_buf,
  70                                  image->initrd_buf_len, image->cmdline_buf,
  71                                  image->cmdline_buf_len);
  72 }
  73
  74 void * __weak arch_kexec_kernel_image_load(struct kimage *image)
  75 {
  76         return kexec_image_load_default(image);
  77 }
  78
  79 int kexec_image_post_load_cleanup_default(struct kimage *image)
  80 {
  81         if (!image->fops || !image->fops->cleanup)
  82                 return 0;
  83
  84         return image->fops->cleanup(image->image_loader_data);
  85 }
  86
  87 int __weak arch_kimage_file_post_load_cleanup(struct kimage *image)
  88 {
  89         return kexec_image_post_load_cleanup_default(image);
  90 }
  91
  92 #ifdef CONFIG_KEXEC_SIG
  93 static int kexec_image_verify_sig_default(struct kimage *image, void *buf,
  94                                           unsigned long buf_len)
  95 {
  96         if (!image->fops || !image->fops->verify_sig) {
  97                 pr_debug("kernel loader does not support signature verification.\n");
  98                 return -EKEYREJECTED;
  99         }
 100
 101         return image->fops->verify_sig(buf, buf_len);
 102 }
 103
 104 int __weak arch_kexec_kernel_verify_sig(struct kimage *image, void *buf,
 105                                         unsigned long buf_len)
 106 {
 107         return kexec_image_verify_sig_default(image, buf, buf_len);
 108 }
 109 #endif
 110
 111 /*
 112  * arch_kexec_apply_relocations_add - apply relocations of type RELA
 113  * @pi:         Purgatory to be relocated.
 114  * @section:    Section relocations applying to.
 115  * @relsec:     Section containing RELAs.
 116  * @symtab:     Corresponding symtab.
 117  *
 118  * Return: 0 on success, negative errno on error.
 119  */
 120 int __weak
 121 arch_kexec_apply_relocations_add(struct purgatory_info *pi, Elf_Shdr *section,
 122                                  const Elf_Shdr *relsec, const Elf_Shdr *symtab)
 123 {
 124         pr_err("RELA relocation unsupported.\n");
 125         return -ENOEXEC;
 126 }
 127
 128 /*
 129  * arch_kexec_apply_relocations - apply relocations of type REL
 130  * @pi:         Purgatory to be relocated.
 131  * @section:    Section relocations applying to.
 132  * @relsec:     Section containing RELs.
 133  * @symtab:     Corresponding symtab.
 134  *
 135  * Return: 0 on success, negative errno on error.
 136  */
 137 int __weak
 138 arch_kexec_apply_relocations(struct purgatory_info *pi, Elf_Shdr *section,
 139                              const Elf_Shdr *relsec, const Elf_Shdr *symtab)
 140 {
 141         pr_err("REL relocation unsupported.\n");
 142         return -ENOEXEC;
 143 }
 144
 145 /*
 146  * Free up memory used by kernel, initrd, and command line. This is temporary
 147  * memory allocation which is not needed any more after these buffers have
 148  * been loaded into separate segments and have been copied elsewhere.
 149  */
 150 void kimage_file_post_load_cleanup(struct kimage *image)
 151 {
 152         struct purgatory_info *pi = &image->purgatory_info;
 153
 154         vfree(image->kernel_buf);
 155         image->kernel_buf = NULL;
 156
 157         vfree(image->initrd_buf);
 158         image->initrd_buf = NULL;
 159
 160         kfree(image->cmdline_buf);
 161         image->cmdline_buf = NULL;
 162
 163         vfree(pi->purgatory_buf);
 164         pi->purgatory_buf = NULL;
 165
 166         vfree(pi->sechdrs);
 167         pi->sechdrs = NULL;
 168
 169 #ifdef CONFIG_IMA_KEXEC
 170         vfree(image->ima_buffer);
 171         image->ima_buffer = NULL;
 172 #endif /* CONFIG_IMA_KEXEC */
 173
 174         /* See if architecture has anything to cleanup post load */
 175         arch_kimage_file_post_load_cleanup(image);
 176
 177         /*
 178          * Above call should have called into bootloader to free up
 179          * any data stored in kimage->image_loader_data. It should
 180          * be ok now to free it up.
 181          */
 182         kfree(image->image_loader_data);
 183         image->image_loader_data = NULL;
 184 }
 185
 186 #ifdef CONFIG_KEXEC_SIG
 187 static int
 188 kimage_validate_signature(struct kimage *image)
 189 {
 190         int ret;
 191
 192         ret = arch_kexec_kernel_verify_sig(image, image->kernel_buf,
 193                                            image->kernel_buf_len);
 194         if (ret) {
 195
 196                 if (IS_ENABLED(CONFIG_KEXEC_SIG_FORCE)) {
 197                         pr_notice("Enforced kernel signature verification failed (%d).\n", ret);
 198                         return ret;
 199                 }
 200
 201                 /*
 202                  * If IMA is guaranteed to appraise a signature on the kexec
 203                  * image, permit it even if the kernel is otherwise locked
 204                  * down.
 205                  */
 206                 if (!ima_appraise_signature(READING_KEXEC_IMAGE) &&
 207                     security_locked_down(LOCKDOWN_KEXEC))
 208                         return -EPERM;
 209
 210                 pr_debug("kernel signature verification failed (%d).\n", ret);
 211         }
 212
 213         return 0;
 214 }
 215 #endif
 216
 217 /*
 218  * In file mode list of segments is prepared by kernel. Copy relevant
 219  * data from user space, do error checking, prepare segment list
 220  */
 221 static int
 222 kimage_file_prepare_segments(struct kimage *image, int kernel_fd, int initrd_fd,
 223                              const char __user *cmdline_ptr,
 224                              unsigned long cmdline_len, unsigned flags)
 225 {
 226         int ret;
 227         void *ldata;
 228
 229         ret = kernel_read_file_from_fd(kernel_fd, 0, &image->kernel_buf,
 230                                        INT_MAX, NULL, READING_KEXEC_IMAGE);
 231         if (ret < 0)
 232                 return ret;
 233         image->kernel_buf_len = ret;
 234
 235         /* Call arch image probe handlers */
 236         ret = arch_kexec_kernel_image_probe(image, image->kernel_buf,
 237                                             image->kernel_buf_len);
 238         if (ret)
 239                 goto out;
 240
 241 #ifdef CONFIG_KEXEC_SIG
 242         ret = kimage_validate_signature(image);
 243
 244         if (ret)
 245                 goto out;
 246 #endif
 247         /* It is possible that there no initramfs is being loaded */
 248         if (!(flags & KEXEC_FILE_NO_INITRAMFS)) {
 249                 ret = kernel_read_file_from_fd(initrd_fd, 0, &image->initrd_buf,
 250                                                INT_MAX, NULL,
 251                                                READING_KEXEC_INITRAMFS);
 252                 if (ret < 0)
 253                         goto out;
 254                 image->initrd_buf_len = ret;
 255                 ret = 0;
 256         }
 257
 258         if (cmdline_len) {
 259                 image->cmdline_buf = memdup_user(cmdline_ptr, cmdline_len);
 260                 if (IS_ERR(image->cmdline_buf)) {
 261                         ret = PTR_ERR(image->cmdline_buf);
 262                         image->cmdline_buf = NULL;
 263                         goto out;
 264                 }
 265
 266                 image->cmdline_buf_len = cmdline_len;
 267
 268                 /* command line should be a string with last byte null */
 269                 if (image->cmdline_buf[cmdline_len - 1] != '\0') {
 270                         ret = -EINVAL;
 271                         goto out;
 272                 }
 273
 274                 ima_kexec_cmdline(kernel_fd, image->cmdline_buf,
 275                                   image->cmdline_buf_len - 1);
 276         }
 277
 278         /* IMA needs to pass the measurement list to the next kernel. */
 279         ima_add_kexec_buffer(image);
 280
 281         /* Call arch image load handlers */
 282         ldata = arch_kexec_kernel_image_load(image);
 283
 284         if (IS_ERR(ldata)) {
 285                 ret = PTR_ERR(ldata);
 286                 goto out;
 287         }
 288
 289         image->image_loader_data = ldata;
 290 out:
 291         /* In case of error, free up all allocated memory in this function */
 292         if (ret)
 293                 kimage_file_post_load_cleanup(image);
 294         return ret;
 295 }
 296
 297 static int
 298 kimage_file_alloc_init(struct kimage **rimage, int kernel_fd,
 299                        int initrd_fd, const char __user *cmdline_ptr,
 300                        unsigned long cmdline_len, unsigned long flags)
 301 {
 302         int ret;
 303         struct kimage *image;
 304         bool kexec_on_panic = flags & KEXEC_FILE_ON_CRASH;
 305
 306         image = do_kimage_alloc_init();
 307         if (!image)
 308                 return -ENOMEM;
 309
 310         image->file_mode = 1;
 311
 312         if (kexec_on_panic) {
 313                 /* Enable special crash kernel control page alloc policy. */
 314                 image->control_page = crashk_res.start;
 315                 image->type = KEXEC_TYPE_CRASH;
 316         }
 317
 318         ret = kimage_file_prepare_segments(image, kernel_fd, initrd_fd,
 319                                            cmdline_ptr, cmdline_len, flags);
 320         if (ret)
 321                 goto out_free_image;
 322
 323         ret = sanity_check_segment_list(image);
 324         if (ret)
 325                 goto out_free_post_load_bufs;
 326
 327         ret = -ENOMEM;
 328         image->control_code_page = kimage_alloc_control_pages(image,
 329                                            get_order(KEXEC_CONTROL_PAGE_SIZE));
 330         if (!image->control_code_page) {
 331                 pr_err("Could not allocate control_code_buffer\n");
 332                 goto out_free_post_load_bufs;
 333         }
 334
 335         if (!kexec_on_panic) {
 336                 image->swap_page = kimage_alloc_control_pages(image, 0);
 337                 if (!image->swap_page) {
 338                         pr_err("Could not allocate swap buffer\n");
 339                         goto out_free_control_pages;
 340                 }
 341         }
 342
 343         *rimage = image;
 344         return 0;
 345 out_free_control_pages:
 346         kimage_free_page_list(&image->control_pages);
 347 out_free_post_load_bufs:
 348         kimage_file_post_load_cleanup(image);
 349 out_free_image:
 350         kfree(image);
 351         return ret;
 352 }
 353
 354 SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
 355                 unsigned long, cmdline_len, const char __user *, cmdline_ptr,
 356                 unsigned long, flags)
 357 {
 358         int ret = 0, i;
 359         struct kimage **dest_image, *image;
 360
 361         /* We only trust the superuser with rebooting the system. */
 362         if (!capable(CAP_SYS_BOOT) || kexec_load_disabled)
 363                 return -EPERM;
 364
 365         /* Make sure we have a legal set of flags */
 366         if (flags != (flags & KEXEC_FILE_FLAGS))
 367                 return -EINVAL;
 368
 369         image = NULL;
 370
 371         if (!mutex_trylock(&kexec_mutex))
 372                 return -EBUSY;
 373
 374         dest_image = &kexec_image;
 375         if (flags & KEXEC_FILE_ON_CRASH) {
 376                 dest_image = &kexec_crash_image;
 377                 if (kexec_crash_image)
 378                         arch_kexec_unprotect_crashkres();
 379         }
 380
 381         if (flags & KEXEC_FILE_UNLOAD)
 382                 goto exchange;
 383
 384         /*
 385          * In case of crash, new kernel gets loaded in reserved region. It is
 386          * same memory where old crash kernel might be loaded. Free any
 387          * current crash dump kernel before we corrupt it.
 388          */
 389         if (flags & KEXEC_FILE_ON_CRASH)
 390                 kimage_free(xchg(&kexec_crash_image, NULL));
 391
 392         ret = kimage_file_alloc_init(&image, kernel_fd, initrd_fd, cmdline_ptr,
 393                                      cmdline_len, flags);
 394         if (ret)
 395                 goto out;
 396
 397         ret = machine_kexec_prepare(image);
 398         if (ret)
 399                 goto out;
 400
 401         /*
 402          * Some architecture(like S390) may touch the crash memory before
 403          * machine_kexec_prepare(), we must copy vmcoreinfo data after it.
 404          */
 405         ret = kimage_crash_copy_vmcoreinfo(image);
 406         if (ret)
 407                 goto out;
 408
 409         ret = kexec_calculate_store_digests(image);
 410         if (ret)
 411                 goto out;
 412
 413         for (i = 0; i < image->nr_segments; i++) {
 414                 struct kexec_segment *ksegment;
 415
 416                 ksegment = &image->segment[i];
 417                 pr_debug("Loading segment %d: buf=0x%p bufsz=0x%zx mem=0x%lx memsz=0x%zx\n",
 418                          i, ksegment->buf, ksegment->bufsz, ksegment->mem,
 419                          ksegment->memsz);
 420
 421                 ret = kimage_load_segment(image, &image->segment[i]);
 422                 if (ret)
 423                         goto out;
 424         }
 425
 426         kimage_terminate(image);
 427
 428         ret = machine_kexec_post_load(image);
 429         if (ret)
 430                 goto out;
 431
 432         /*
 433          * Free up any temporary buffers allocated which are not needed
 434          * after image has been loaded
 435          */
 436         kimage_file_post_load_cleanup(image);
 437 exchange:
 438         image = xchg(dest_image, image);
 439 out:
 440         if ((flags & KEXEC_FILE_ON_CRASH) && kexec_crash_image)
 441                 arch_kexec_protect_crashkres();
 442
 443         mutex_unlock(&kexec_mutex);
 444         kimage_free(image);
 445         return ret;
 446 }
 447
 448 static int locate_mem_hole_top_down(unsigned long start, unsigned long end,
 449                                     struct kexec_buf *kbuf)
 450 {
 451         struct kimage *image = kbuf->image;
 452         unsigned long temp_start, temp_end;
 453
 454         temp_end = min(end, kbuf->buf_max);
 455         temp_start = temp_end - kbuf->memsz;
 456
 457         do {
 458                 /* align down start */
 459                 temp_start = temp_start & (~(kbuf->buf_align - 1));
 460
 461                 if (temp_start < start || temp_start < kbuf->buf_min)
 462                         return 0;
 463
 464                 temp_end = temp_start + kbuf->memsz - 1;
 465
 466                 /*
 467                  * Make sure this does not conflict with any of existing
 468                  * segments
 469                  */
 470                 if (kimage_is_destination_range(image, temp_start, temp_end)) {
 471                         temp_start = temp_start - PAGE_SIZE;
 472                         continue;
 473                 }
 474
 475                 /* We found a suitable memory range */
 476                 break;
 477         } while (1);
 478
 479         /* If we are here, we found a suitable memory range */
 480         kbuf->mem = temp_start;
 481
 482         /* Success, stop navigating through remaining System RAM ranges */
 483         return 1;
 484 }
 485
 486 static int locate_mem_hole_bottom_up(unsigned long start, unsigned long end,
 487                                      struct kexec_buf *kbuf)
 488 {
 489         struct kimage *image = kbuf->image;
 490         unsigned long temp_start, temp_end;
 491
 492         temp_start = max(start, kbuf->buf_min);
 493
 494         do {
 495                 temp_start = ALIGN(temp_start, kbuf->buf_align);
 496                 temp_end = temp_start + kbuf->memsz - 1;
 497
 498                 if (temp_end > end || temp_end > kbuf->buf_max)
 499                         return 0;
 500                 /*
 501                  * Make sure this does not conflict with any of existing
 502                  * segments
 503                  */
 504                 if (kimage_is_destination_range(image, temp_start, temp_end)) {
 505                         temp_start = temp_start + PAGE_SIZE;
 506                         continue;
 507                 }
 508
 509                 /* We found a suitable memory range */
 510                 break;
 511         } while (1);
 512
 513         /* If we are here, we found a suitable memory range */
 514         kbuf->mem = temp_start;
 515
 516         /* Success, stop navigating through remaining System RAM ranges */
 517         return 1;
 518 }
 519
 520 static int locate_mem_hole_callback(struct resource *res, void *arg)
 521 {
 522         struct kexec_buf *kbuf = (struct kexec_buf *)arg;
 523         u64 start = res->start, end = res->end;
 524         unsigned long sz = end - start + 1;
 525
 526         /* Returning 0 will take to next memory range */
 527
 528         /* Don't use memory that will be detected and handled by a driver. */
 529         if (res->flags & IORESOURCE_SYSRAM_DRIVER_MANAGED)
 530                 return 0;
 531
 532         if (sz < kbuf->memsz)
 533                 return 0;
 534
 535         if (end < kbuf->buf_min || start > kbuf->buf_max)
 536                 return 0;
 537
 538         /*
 539          * Allocate memory top down with-in ram range. Otherwise bottom up
 540          * allocation.
 541          */
 542         if (kbuf->top_down)
 543                 return locate_mem_hole_top_down(start, end, kbuf);
 544         return locate_mem_hole_bottom_up(start, end, kbuf);
 545 }
 546
 547 #ifdef CONFIG_ARCH_KEEP_MEMBLOCK
 548 static int kexec_walk_memblock(struct kexec_buf *kbuf,
 549                                int (*func)(struct resource *, void *))
 550 {
 551         int ret = 0;
 552         u64 i;
 553         phys_addr_t mstart, mend;
 554         struct resource res = { };
 555
 556         if (kbuf->image->type == KEXEC_TYPE_CRASH)
 557                 return func(&crashk_res, kbuf);
 558
 559         if (kbuf->top_down) {
 560                 for_each_free_mem_range_reverse(i, NUMA_NO_NODE, MEMBLOCK_NONE,
 561                                                 &mstart, &mend, NULL) {
 562                         /*
 563                          * In memblock, end points to the first byte after the
 564                          * range while in kexec, end points to the last byte
 565                          * in the range.
 566                          */
 567                         res.start = mstart;
 568                         res.end = mend - 1;
 569                         ret = func(&res, kbuf);
 570                         if (ret)
 571                                 break;
 572                 }
 573         } else {
 574                 for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE,
 575                                         &mstart, &mend, NULL) {
 576                         /*
 577                          * In memblock, end points to the first byte after the
 578                          * range while in kexec, end points to the last byte
 579                          * in the range.
 580                          */
 581                         res.start = mstart;
 582                         res.end = mend - 1;
 583                         ret = func(&res, kbuf);
 584                         if (ret)
 585                                 break;
 586                 }
 587         }
 588
 589         return ret;
 590 }
 591 #else
 592 static int kexec_walk_memblock(struct kexec_buf *kbuf,
 593                                int (*func)(struct resource *, void *))
 594 {
 595         return 0;
 596 }
 597 #endif
 598
 599 /**
 600  * kexec_walk_resources - call func(data) on free memory regions
 601  * @kbuf:       Context info for the search. Also passed to @func.
 602  * @func:       Function to call for each memory region.
 603  *
 604  * Return: The memory walk will stop when func returns a non-zero value
 605  * and that value will be returned. If all free regions are visited without
 606  * func returning non-zero, then zero will be returned.
 607  */
 608 static int kexec_walk_resources(struct kexec_buf *kbuf,
 609                                 int (*func)(struct resource *, void *))
 610 {
 611         if (kbuf->image->type == KEXEC_TYPE_CRASH)
 612                 return walk_iomem_res_desc(crashk_res.desc,
 613                                            IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY,
 614                                            crashk_res.start, crashk_res.end,
 615                                            kbuf, func);
 616         else
 617                 return walk_system_ram_res(0, ULONG_MAX, kbuf, func);
 618 }
 619
 620 /**
 621  * kexec_locate_mem_hole - find free memory for the purgatory or the next kernel
 622  * @kbuf:       Parameters for the memory search.
 623  *
 624  * On success, kbuf->mem will have the start address of the memory region found.
 625  *
 626  * Return: 0 on success, negative errno on error.
 627  */
 628 int kexec_locate_mem_hole(struct kexec_buf *kbuf)
 629 {
 630         int ret;
 631
 632         /* Arch knows where to place */
 633         if (kbuf->mem != KEXEC_BUF_MEM_UNKNOWN)
 634                 return 0;
 635
 636         if (!IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK))
 637                 ret = kexec_walk_resources(kbuf, locate_mem_hole_callback);
 638         else
 639                 ret = kexec_walk_memblock(kbuf, locate_mem_hole_callback);
 640
 641         return ret == 1 ? 0 : -EADDRNOTAVAIL;
 642 }
 643
 644 /**
 645  * arch_kexec_locate_mem_hole - Find free memory to place the segments.
 646  * @kbuf:                       Parameters for the memory search.
 647  *
 648  * On success, kbuf->mem will have the start address of the memory region found.
 649  *
 650  * Return: 0 on success, negative errno on error.
 651  */
 652 int __weak arch_kexec_locate_mem_hole(struct kexec_buf *kbuf)
 653 {
 654         return kexec_locate_mem_hole(kbuf);
 655 }
 656
 657 /**
 658  * kexec_add_buffer - place a buffer in a kexec segment
 659  * @kbuf:       Buffer contents and memory parameters.
 660  *
 661  * This function assumes that kexec_mutex is held.
 662  * On successful return, @kbuf->mem will have the physical address of
 663  * the buffer in memory.
 664  *
 665  * Return: 0 on success, negative errno on error.
 666  */
 667 int kexec_add_buffer(struct kexec_buf *kbuf)
 668 {
 669         struct kexec_segment *ksegment;
 670         int ret;
 671
 672         /* Currently adding segment this way is allowed only in file mode */
 673         if (!kbuf->image->file_mode)
 674                 return -EINVAL;
 675
 676         if (kbuf->image->nr_segments >= KEXEC_SEGMENT_MAX)
 677                 return -EINVAL;
 678
 679         /*
 680          * Make sure we are not trying to add buffer after allocating
 681          * control pages. All segments need to be placed first before
 682          * any control pages are allocated. As control page allocation
 683          * logic goes through list of segments to make sure there are
 684          * no destination overlaps.
 685          */
 686         if (!list_empty(&kbuf->image->control_pages)) {
 687                 WARN_ON(1);
 688                 return -EINVAL;
 689         }
 690
 691         /* Ensure minimum alignment needed for segments. */
 692         kbuf->memsz = ALIGN(kbuf->memsz, PAGE_SIZE);
 693         kbuf->buf_align = max(kbuf->buf_align, PAGE_SIZE);
 694
 695         /* Walk the RAM ranges and allocate a suitable range for the buffer */
 696         ret = arch_kexec_locate_mem_hole(kbuf);
 697         if (ret)
 698                 return ret;
 699
 700         /* Found a suitable memory range */
 701         ksegment = &kbuf->image->segment[kbuf->image->nr_segments];
 702         ksegment->kbuf = kbuf->buffer;
 703         ksegment->bufsz = kbuf->bufsz;
 704         ksegment->mem = kbuf->mem;
 705         ksegment->memsz = kbuf->memsz;
 706         kbuf->image->nr_segments++;
 707         return 0;
 708 }
 709
 710 /* Calculate and store the digest of segments */
 711 static int kexec_calculate_store_digests(struct kimage *image)
 712 {
 713         struct crypto_shash *tfm;
 714         struct shash_desc *desc;
 715         int ret = 0, i, j, zero_buf_sz, sha_region_sz;
 716         size_t desc_size, nullsz;
 717         char *digest;
 718         void *zero_buf;
 719         struct kexec_sha_region *sha_regions;
 720         struct purgatory_info *pi = &image->purgatory_info;
 721
 722         if (!IS_ENABLED(CONFIG_ARCH_HAS_KEXEC_PURGATORY))
 723                 return 0;
 724
 725         zero_buf = __va(page_to_pfn(ZERO_PAGE(0)) << PAGE_SHIFT);
 726         zero_buf_sz = PAGE_SIZE;
 727
 728         tfm = crypto_alloc_shash("sha256", 0, 0);
 729         if (IS_ERR(tfm)) {
 730                 ret = PTR_ERR(tfm);
 731                 goto out;
 732         }
 733
 734         desc_size = crypto_shash_descsize(tfm) + sizeof(*desc);
 735         desc = kzalloc(desc_size, GFP_KERNEL);
 736         if (!desc) {
 737                 ret = -ENOMEM;
 738                 goto out_free_tfm;
 739         }
 740
 741         sha_region_sz = KEXEC_SEGMENT_MAX * sizeof(struct kexec_sha_region);
 742         sha_regions = vzalloc(sha_region_sz);
 743         if (!sha_regions) {
 744                 ret = -ENOMEM;
 745                 goto out_free_desc;
 746         }
 747
 748         desc->tfm   = tfm;
 749
 750         ret = crypto_shash_init(desc);
 751         if (ret < 0)
 752                 goto out_free_sha_regions;
 753
 754         digest = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);
 755         if (!digest) {
 756                 ret = -ENOMEM;
 757                 goto out_free_sha_regions;
 758         }
 759
 760         for (j = i = 0; i < image->nr_segments; i++) {
 761                 struct kexec_segment *ksegment;
 762
 763                 ksegment = &image->segment[i];
 764                 /*
 765                  * Skip purgatory as it will be modified once we put digest
 766                  * info in purgatory.
 767                  */
 768                 if (ksegment->kbuf == pi->purgatory_buf)
 769                         continue;
 770
 771                 ret = crypto_shash_update(desc, ksegment->kbuf,
 772                                           ksegment->bufsz);
 773                 if (ret)
 774                         break;
 775
 776                 /*
 777                  * Assume rest of the buffer is filled with zero and
 778                  * update digest accordingly.
 779                  */
 780                 nullsz = ksegment->memsz - ksegment->bufsz;
 781                 while (nullsz) {
 782                         unsigned long bytes = nullsz;
 783
 784                         if (bytes > zero_buf_sz)
 785                                 bytes = zero_buf_sz;
 786                         ret = crypto_shash_update(desc, zero_buf, bytes);
 787                         if (ret)
 788                                 break;
 789                         nullsz -= bytes;
 790                 }
 791
 792                 if (ret)
 793                         break;
 794
 795                 sha_regions[j].start = ksegment->mem;
 796                 sha_regions[j].len = ksegment->memsz;
 797                 j++;
 798         }
 799
 800         if (!ret) {
 801                 ret = crypto_shash_final(desc, digest);
 802                 if (ret)
 803                         goto out_free_digest;
 804                 ret = kexec_purgatory_get_set_symbol(image, "purgatory_sha_regions",
 805                                                      sha_regions, sha_region_sz, 0);
 806                 if (ret)
 807                         goto out_free_digest;
 808
 809                 ret = kexec_purgatory_get_set_symbol(image, "purgatory_sha256_digest",
 810                                                      digest, SHA256_DIGEST_SIZE, 0);
 811                 if (ret)
 812                         goto out_free_digest;
 813         }
 814
 815 out_free_digest:
 816         kfree(digest);
 817 out_free_sha_regions:
 818         vfree(sha_regions);
 819 out_free_desc:
 820         kfree(desc);
 821 out_free_tfm:
 822         kfree(tfm);
 823 out:
 824         return ret;
 825 }
 826
 827 #ifdef CONFIG_ARCH_HAS_KEXEC_PURGATORY
 828 /*
 829  * kexec_purgatory_setup_kbuf - prepare buffer to load purgatory.
 830  * @pi:         Purgatory to be loaded.
 831  * @kbuf:       Buffer to setup.
 832  *
 833  * Allocates the memory needed for the buffer. Caller is responsible to free
 834  * the memory after use.
 835  *
 836  * Return: 0 on success, negative errno on error.
 837  */
 838 static int kexec_purgatory_setup_kbuf(struct purgatory_info *pi,
 839                                       struct kexec_buf *kbuf)
 840 {
 841         const Elf_Shdr *sechdrs;
 842         unsigned long bss_align;
 843         unsigned long bss_sz;
 844         unsigned long align;
 845         int i, ret;
 846
 847         sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff;
 848         kbuf->buf_align = bss_align = 1;
 849         kbuf->bufsz = bss_sz = 0;
 850
 851         for (i = 0; i < pi->ehdr->e_shnum; i++) {
 852                 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
 853                         continue;
 854
 855                 align = sechdrs[i].sh_addralign;
 856                 if (sechdrs[i].sh_type != SHT_NOBITS) {
 857                         if (kbuf->buf_align < align)
 858                                 kbuf->buf_align = align;
 859                         kbuf->bufsz = ALIGN(kbuf->bufsz, align);
 860                         kbuf->bufsz += sechdrs[i].sh_size;
 861                 } else {
 862                         if (bss_align < align)
 863                                 bss_align = align;
 864                         bss_sz = ALIGN(bss_sz, align);
 865                         bss_sz += sechdrs[i].sh_size;
 866                 }
 867         }
 868         kbuf->bufsz = ALIGN(kbuf->bufsz, bss_align);
 869         kbuf->memsz = kbuf->bufsz + bss_sz;
 870         if (kbuf->buf_align < bss_align)
 871                 kbuf->buf_align = bss_align;
 872
 873         kbuf->buffer = vzalloc(kbuf->bufsz);
 874         if (!kbuf->buffer)
 875                 return -ENOMEM;
 876         pi->purgatory_buf = kbuf->buffer;
 877
 878         ret = kexec_add_buffer(kbuf);
 879         if (ret)
 880                 goto out;
 881
 882         return 0;
 883 out:
 884         vfree(pi->purgatory_buf);
 885         pi->purgatory_buf = NULL;
 886         return ret;
 887 }
 888
 889 /*
 890  * kexec_purgatory_setup_sechdrs - prepares the pi->sechdrs buffer.
 891  * @pi:         Purgatory to be loaded.
 892  * @kbuf:       Buffer prepared to store purgatory.
 893  *
 894  * Allocates the memory needed for the buffer. Caller is responsible to free
 895  * the memory after use.
 896  *
 897  * Return: 0 on success, negative errno on error.
 898  */
 899 static int kexec_purgatory_setup_sechdrs(struct purgatory_info *pi,
 900                                          struct kexec_buf *kbuf)
 901 {
 902         unsigned long bss_addr;
 903         unsigned long offset;
 904         Elf_Shdr *sechdrs;
 905         int i;
 906
 907         /*
 908          * The section headers in kexec_purgatory are read-only. In order to
 909          * have them modifiable make a temporary copy.
 910          */
 911         sechdrs = vzalloc(array_size(sizeof(Elf_Shdr), pi->ehdr->e_shnum));
 912         if (!sechdrs)
 913                 return -ENOMEM;
 914         memcpy(sechdrs, (void *)pi->ehdr + pi->ehdr->e_shoff,
 915                pi->ehdr->e_shnum * sizeof(Elf_Shdr));
 916         pi->sechdrs = sechdrs;
 917
 918         offset = 0;
 919         bss_addr = kbuf->mem + kbuf->bufsz;
 920         kbuf->image->start = pi->ehdr->e_entry;
 921
 922         for (i = 0; i < pi->ehdr->e_shnum; i++) {
 923                 unsigned long align;
 924                 void *src, *dst;
 925
 926                 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
 927                         continue;
 928
 929                 align = sechdrs[i].sh_addralign;
 930                 if (sechdrs[i].sh_type == SHT_NOBITS) {
 931                         bss_addr = ALIGN(bss_addr, align);
 932                         sechdrs[i].sh_addr = bss_addr;
 933                         bss_addr += sechdrs[i].sh_size;
 934                         continue;
 935                 }
 936
 937                 offset = ALIGN(offset, align);
 938                 if (sechdrs[i].sh_flags & SHF_EXECINSTR &&
 939                     pi->ehdr->e_entry >= sechdrs[i].sh_addr &&
 940                     pi->ehdr->e_entry < (sechdrs[i].sh_addr
 941                                          + sechdrs[i].sh_size)) {
 942                         kbuf->image->start -= sechdrs[i].sh_addr;
 943                         kbuf->image->start += kbuf->mem + offset;
 944                 }
 945
 946                 src = (void *)pi->ehdr + sechdrs[i].sh_offset;
 947                 dst = pi->purgatory_buf + offset;
 948                 memcpy(dst, src, sechdrs[i].sh_size);
 949
 950                 sechdrs[i].sh_addr = kbuf->mem + offset;
 951                 sechdrs[i].sh_offset = offset;
 952                 offset += sechdrs[i].sh_size;
 953         }
 954
 955         return 0;
 956 }
 957
 958 static int kexec_apply_relocations(struct kimage *image)
 959 {
 960         int i, ret;
 961         struct purgatory_info *pi = &image->purgatory_info;
 962         const Elf_Shdr *sechdrs;
 963
 964         sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff;
 965
 966         for (i = 0; i < pi->ehdr->e_shnum; i++) {
 967                 const Elf_Shdr *relsec;
 968                 const Elf_Shdr *symtab;
 969                 Elf_Shdr *section;
 970
 971                 relsec = sechdrs + i;
 972
 973                 if (relsec->sh_type != SHT_RELA &&
 974                     relsec->sh_type != SHT_REL)
 975                         continue;
 976
 977                 /*
 978                  * For section of type SHT_RELA/SHT_REL,
 979                  * ->sh_link contains section header index of associated
 980                  * symbol table. And ->sh_info contains section header
 981                  * index of section to which relocations apply.
 982                  */
 983                 if (relsec->sh_info >= pi->ehdr->e_shnum ||
 984                     relsec->sh_link >= pi->ehdr->e_shnum)
 985                         return -ENOEXEC;
 986
 987                 section = pi->sechdrs + relsec->sh_info;
 988                 symtab = sechdrs + relsec->sh_link;
 989
 990                 if (!(section->sh_flags & SHF_ALLOC))
 991                         continue;
 992
 993                 /*
 994                  * symtab->sh_link contain section header index of associated
 995                  * string table.
 996                  */
 997                 if (symtab->sh_link >= pi->ehdr->e_shnum)
 998                         /* Invalid section number? */
 999                         continue;
1000
1001                 /*
1002                  * Respective architecture needs to provide support for applying
1003                  * relocations of type SHT_RELA/SHT_REL.
1004                  */
1005                 if (relsec->sh_type == SHT_RELA)
1006                         ret = arch_kexec_apply_relocations_add(pi, section,
1007                                                                relsec, symtab);
1008                 else if (relsec->sh_type == SHT_REL)
1009                         ret = arch_kexec_apply_relocations(pi, section,
1010                                                            relsec, symtab);
1011                 if (ret)
1012                         return ret;
1013         }
1014
1015         return 0;
1016 }
1017
1018 /*
1019  * kexec_load_purgatory - Load and relocate the purgatory object.
1020  * @image:      Image to add the purgatory to.
1021  * @kbuf:       Memory parameters to use.
1022  *
1023  * Allocates the memory needed for image->purgatory_info.sechdrs and
1024  * image->purgatory_info.purgatory_buf/kbuf->buffer. Caller is responsible
1025  * to free the memory after use.
1026  *
1027  * Return: 0 on success, negative errno on error.
1028  */
1029 int kexec_load_purgatory(struct kimage *image, struct kexec_buf *kbuf)
1030 {
1031         struct purgatory_info *pi = &image->purgatory_info;
1032         int ret;
1033
1034         if (kexec_purgatory_size <= 0)
1035                 return -EINVAL;
1036
1037         pi->ehdr = (const Elf_Ehdr *)kexec_purgatory;
1038
1039         ret = kexec_purgatory_setup_kbuf(pi, kbuf);
1040         if (ret)
1041                 return ret;
1042
1043         ret = kexec_purgatory_setup_sechdrs(pi, kbuf);
1044         if (ret)
1045                 goto out_free_kbuf;
1046
1047         ret = kexec_apply_relocations(image);
1048         if (ret)
1049                 goto out;
1050
1051         return 0;
1052 out:
1053         vfree(pi->sechdrs);
1054         pi->sechdrs = NULL;
1055 out_free_kbuf:
1056         vfree(pi->purgatory_buf);
1057         pi->purgatory_buf = NULL;
1058         return ret;
1059 }
1060
1061 /*
1062  * kexec_purgatory_find_symbol - find a symbol in the purgatory
1063  * @pi:         Purgatory to search in.
1064  * @name:       Name of the symbol.
1065  *
1066  * Return: pointer to symbol in read-only symtab on success, NULL on error.
1067  */
1068 static const Elf_Sym *kexec_purgatory_find_symbol(struct purgatory_info *pi,
1069                                                   const char *name)
1070 {
1071         const Elf_Shdr *sechdrs;
1072         const Elf_Ehdr *ehdr;
1073         const Elf_Sym *syms;
1074         const char *strtab;
1075         int i, k;
1076
1077         if (!pi->ehdr)
1078                 return NULL;
1079
1080         ehdr = pi->ehdr;
1081         sechdrs = (void *)ehdr + ehdr->e_shoff;
1082
1083         for (i = 0; i < ehdr->e_shnum; i++) {
1084                 if (sechdrs[i].sh_type != SHT_SYMTAB)
1085                         continue;
1086
1087                 if (sechdrs[i].sh_link >= ehdr->e_shnum)
1088                         /* Invalid strtab section number */
1089                         continue;
1090                 strtab = (void *)ehdr + sechdrs[sechdrs[i].sh_link].sh_offset;
1091                 syms = (void *)ehdr + sechdrs[i].sh_offset;
1092
1093                 /* Go through symbols for a match */
1094                 for (k = 0; k < sechdrs[i].sh_size/sizeof(Elf_Sym); k++) {
1095                         if (ELF_ST_BIND(syms[k].st_info) != STB_GLOBAL)
1096                                 continue;
1097
1098                         if (strcmp(strtab + syms[k].st_name, name) != 0)
1099                                 continue;
1100
1101                         if (syms[k].st_shndx == SHN_UNDEF ||
1102                             syms[k].st_shndx >= ehdr->e_shnum) {
1103                                 pr_debug("Symbol: %s has bad section index %d.\n",
1104                                                 name, syms[k].st_shndx);
1105                                 return NULL;
1106                         }
1107
1108                         /* Found the symbol we are looking for */
1109                         return &syms[k];
1110                 }
1111         }
1112
1113         return NULL;
1114 }
1115
1116 void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name)
1117 {
1118         struct purgatory_info *pi = &image->purgatory_info;
1119         const Elf_Sym *sym;
1120         Elf_Shdr *sechdr;
1121
1122         sym = kexec_purgatory_find_symbol(pi, name);
1123         if (!sym)
1124                 return ERR_PTR(-EINVAL);
1125
1126         sechdr = &pi->sechdrs[sym->st_shndx];
1127
1128         /*
1129          * Returns the address where symbol will finally be loaded after
1130          * kexec_load_segment()
1131          */
1132         return (void *)(sechdr->sh_addr + sym->st_value);
1133 }
1134
1135 /*
1136  * Get or set value of a symbol. If "get_value" is true, symbol value is
1137  * returned in buf otherwise symbol value is set based on value in buf.
1138  */
1139 int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name,
1140                                    void *buf, unsigned int size, bool get_value)
1141 {
1142         struct purgatory_info *pi = &image->purgatory_info;
1143         const Elf_Sym *sym;
1144         Elf_Shdr *sec;
1145         char *sym_buf;
1146
1147         sym = kexec_purgatory_find_symbol(pi, name);
1148         if (!sym)
1149                 return -EINVAL;
1150
1151         if (sym->st_size != size) {
1152                 pr_err("symbol %s size mismatch: expected %lu actual %u\n",
1153                        name, (unsigned long)sym->st_size, size);
1154                 return -EINVAL;
1155         }
1156
1157         sec = pi->sechdrs + sym->st_shndx;
1158
1159         if (sec->sh_type == SHT_NOBITS) {
1160                 pr_err("symbol %s is in a bss section. Cannot %s\n", name,
1161                        get_value ? "get" : "set");
1162                 return -EINVAL;
1163         }
1164
1165         sym_buf = (char *)pi->purgatory_buf + sec->sh_offset + sym->st_value;
1166
1167         if (get_value)
1168                 memcpy((void *)buf, sym_buf, size);
1169         else
1170                 memcpy((void *)sym_buf, buf, size);
1171
1172         return 0;
1173 }
1174 #endif /* CONFIG_ARCH_HAS_KEXEC_PURGATORY */
1175
1176 int crash_exclude_mem_range(struct crash_mem *mem,
1177                             unsigned long long mstart, unsigned long long mend)
1178 {
1179         int i, j;
1180         unsigned long long start, end, p_start, p_end;
1181         struct crash_mem_range temp_range = {0, 0};
1182
1183         for (i = 0; i < mem->nr_ranges; i++) {
1184                 start = mem->ranges[i].start;
1185                 end = mem->ranges[i].end;
1186                 p_start = mstart;
1187                 p_end = mend;
1188
1189                 if (mstart > end || mend < start)
1190                         continue;
1191
1192                 /* Truncate any area outside of range */
1193                 if (mstart < start)
1194                         p_start = start;
1195                 if (mend > end)
1196                         p_end = end;
1197
1198                 /* Found completely overlapping range */
1199                 if (p_start == start && p_end == end) {
1200                         mem->ranges[i].start = 0;
1201                         mem->ranges[i].end = 0;
1202                         if (i < mem->nr_ranges - 1) {
1203                                 /* Shift rest of the ranges to left */
1204                                 for (j = i; j < mem->nr_ranges - 1; j++) {
1205                                         mem->ranges[j].start =
1206                                                 mem->ranges[j+1].start;
1207                                         mem->ranges[j].end =
1208                                                         mem->ranges[j+1].end;
1209                                 }
1210
1211                                 /*
1212                                  * Continue to check if there are another overlapping ranges
1213                                  * from the current position because of shifting the above
1214                                  * mem ranges.
1215                                  */
1216                                 i--;
1217                                 mem->nr_ranges--;
1218                                 continue;
1219                         }
1220                         mem->nr_ranges--;
1221                         return 0;
1222                 }
1223
1224                 if (p_start > start && p_end < end) {
1225                         /* Split original range */
1226                         mem->ranges[i].end = p_start - 1;
1227                         temp_range.start = p_end + 1;
1228                         temp_range.end = end;
1229                 } else if (p_start != start)
1230                         mem->ranges[i].end = p_start - 1;
1231                 else
1232                         mem->ranges[i].start = p_end + 1;
1233                 break;
1234         }
1235
1236         /* If a split happened, add the split to array */
1237         if (!temp_range.end)
1238                 return 0;
1239
1240         /* Split happened */
1241         if (i == mem->max_nr_ranges - 1)
1242                 return -ENOMEM;
1243
1244         /* Location where new range should go */
1245         j = i + 1;
1246         if (j < mem->nr_ranges) {
1247                 /* Move over all ranges one slot towards the end */
1248                 for (i = mem->nr_ranges - 1; i >= j; i--)
1249                         mem->ranges[i + 1] = mem->ranges[i];
1250         }
1251
1252         mem->ranges[j].start = temp_range.start;
1253         mem->ranges[j].end = temp_range.end;
1254         mem->nr_ranges++;
1255         return 0;
1256 }
1257
1258 int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map,
1259                           void **addr, unsigned long *sz)
1260 {
1261         Elf64_Ehdr *ehdr;
1262         Elf64_Phdr *phdr;
1263         unsigned long nr_cpus = num_possible_cpus(), nr_phdr, elf_sz;
1264         unsigned char *buf;
1265         unsigned int cpu, i;
1266         unsigned long long notes_addr;
1267         unsigned long mstart, mend;
1268
1269         /* extra phdr for vmcoreinfo ELF note */
1270         nr_phdr = nr_cpus + 1;
1271         nr_phdr += mem->nr_ranges;
1272
1273         /*
1274          * kexec-tools creates an extra PT_LOAD phdr for kernel text mapping
1275          * area (for example, ffffffff80000000 - ffffffffa0000000 on x86_64).
1276          * I think this is required by tools like gdb. So same physical
1277          * memory will be mapped in two ELF headers. One will contain kernel
1278          * text virtual addresses and other will have __va(physical) addresses.
1279          */
1280
1281         nr_phdr++;
1282         elf_sz = sizeof(Elf64_Ehdr) + nr_phdr * sizeof(Elf64_Phdr);
1283         elf_sz = ALIGN(elf_sz, ELF_CORE_HEADER_ALIGN);
1284
1285         buf = vzalloc(elf_sz);
1286         if (!buf)
1287                 return -ENOMEM;
1288
1289         ehdr = (Elf64_Ehdr *)buf;
1290         phdr = (Elf64_Phdr *)(ehdr + 1);
1291         memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
1292         ehdr->e_ident[EI_CLASS] = ELFCLASS64;
1293         ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
1294         ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1295         ehdr->e_ident[EI_OSABI] = ELF_OSABI;
1296         memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD);
1297         ehdr->e_type = ET_CORE;
1298         ehdr->e_machine = ELF_ARCH;
1299         ehdr->e_version = EV_CURRENT;
1300         ehdr->e_phoff = sizeof(Elf64_Ehdr);
1301         ehdr->e_ehsize = sizeof(Elf64_Ehdr);
1302         ehdr->e_phentsize = sizeof(Elf64_Phdr);
1303
1304         /* Prepare one phdr of type PT_NOTE for each present CPU */
1305         for_each_present_cpu(cpu) {
1306                 phdr->p_type = PT_NOTE;
1307                 notes_addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpu));
1308                 phdr->p_offset = phdr->p_paddr = notes_addr;
1309                 phdr->p_filesz = phdr->p_memsz = sizeof(note_buf_t);
1310                 (ehdr->e_phnum)++;
1311                 phdr++;
1312         }
1313
1314         /* Prepare one PT_NOTE header for vmcoreinfo */
1315         phdr->p_type = PT_NOTE;
1316         phdr->p_offset = phdr->p_paddr = paddr_vmcoreinfo_note();
1317         phdr->p_filesz = phdr->p_memsz = VMCOREINFO_NOTE_SIZE;
1318         (ehdr->e_phnum)++;
1319         phdr++;
1320
1321         /* Prepare PT_LOAD type program header for kernel text region */
1322         if (kernel_map) {
1323                 phdr->p_type = PT_LOAD;
1324                 phdr->p_flags = PF_R|PF_W|PF_X;
1325                 phdr->p_vaddr = (unsigned long) _text;
1326                 phdr->p_filesz = phdr->p_memsz = _end - _text;
1327                 phdr->p_offset = phdr->p_paddr = __pa_symbol(_text);
1328                 ehdr->e_phnum++;
1329                 phdr++;
1330         }
1331
1332         /* Go through all the ranges in mem->ranges[] and prepare phdr */
1333         for (i = 0; i < mem->nr_ranges; i++) {
1334                 mstart = mem->ranges[i].start;
1335                 mend = mem->ranges[i].end;
1336
1337                 phdr->p_type = PT_LOAD;
1338                 phdr->p_flags = PF_R|PF_W|PF_X;
1339                 phdr->p_offset  = mstart;
1340
1341                 phdr->p_paddr = mstart;
1342                 phdr->p_vaddr = (unsigned long) __va(mstart);
1343                 phdr->p_filesz = phdr->p_memsz = mend - mstart + 1;
1344                 phdr->p_align = 0;
1345                 ehdr->e_phnum++;
1346                 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",
1347                         phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz,
1348                         ehdr->e_phnum, phdr->p_offset);
1349                 phdr++;
1350         }
1351
1352         *addr = buf;
1353         *sz = elf_sz;
1354         return 0;
1355 }