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