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         /*
 560          * Using MEMBLOCK_NONE will properly skip MEMBLOCK_DRIVER_MANAGED. See
 561          * IORESOURCE_SYSRAM_DRIVER_MANAGED handling in
 562          * locate_mem_hole_callback().
 563          */
 564         if (kbuf->top_down) {
 565                 for_each_free_mem_range_reverse(i, NUMA_NO_NODE, MEMBLOCK_NONE,
 566                                                 &mstart, &mend, NULL) {
 567                         /*
 568                          * In memblock, end points to the first byte after the
 569                          * range while in kexec, end points to the last byte
 570                          * in the range.
 571                          */
 572                         res.start = mstart;
 573                         res.end = mend - 1;
 574                         ret = func(&res, kbuf);
 575                         if (ret)
 576                                 break;
 577                 }
 578         } else {
 579                 for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE,
 580                                         &mstart, &mend, NULL) {
 581                         /*
 582                          * In memblock, end points to the first byte after the
 583                          * range while in kexec, end points to the last byte
 584                          * in the range.
 585                          */
 586                         res.start = mstart;
 587                         res.end = mend - 1;
 588                         ret = func(&res, kbuf);
 589                         if (ret)
 590                                 break;
 591                 }
 592         }
 593
 594         return ret;
 595 }
 596 #else
 597 static int kexec_walk_memblock(struct kexec_buf *kbuf,
 598                                int (*func)(struct resource *, void *))
 599 {
 600         return 0;
 601 }
 602 #endif
 603
 604 /**
 605  * kexec_walk_resources - call func(data) on free memory regions
 606  * @kbuf:       Context info for the search. Also passed to @func.
 607  * @func:       Function to call for each memory region.
 608  *
 609  * Return: The memory walk will stop when func returns a non-zero value
 610  * and that value will be returned. If all free regions are visited without
 611  * func returning non-zero, then zero will be returned.
 612  */
 613 static int kexec_walk_resources(struct kexec_buf *kbuf,
 614                                 int (*func)(struct resource *, void *))
 615 {
 616         if (kbuf->image->type == KEXEC_TYPE_CRASH)
 617                 return walk_iomem_res_desc(crashk_res.desc,
 618                                            IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY,
 619                                            crashk_res.start, crashk_res.end,
 620                                            kbuf, func);
 621         else
 622                 return walk_system_ram_res(0, ULONG_MAX, kbuf, func);
 623 }
 624
 625 /**
 626  * kexec_locate_mem_hole - find free memory for the purgatory or the next kernel
 627  * @kbuf:       Parameters for the memory search.
 628  *
 629  * On success, kbuf->mem will have the start address of the memory region found.
 630  *
 631  * Return: 0 on success, negative errno on error.
 632  */
 633 int kexec_locate_mem_hole(struct kexec_buf *kbuf)
 634 {
 635         int ret;
 636
 637         /* Arch knows where to place */
 638         if (kbuf->mem != KEXEC_BUF_MEM_UNKNOWN)
 639                 return 0;
 640
 641         if (!IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK))
 642                 ret = kexec_walk_resources(kbuf, locate_mem_hole_callback);
 643         else
 644                 ret = kexec_walk_memblock(kbuf, locate_mem_hole_callback);
 645
 646         return ret == 1 ? 0 : -EADDRNOTAVAIL;
 647 }
 648
 649 /**
 650  * arch_kexec_locate_mem_hole - Find free memory to place the segments.
 651  * @kbuf:                       Parameters for the memory search.
 652  *
 653  * On success, kbuf->mem will have the start address of the memory region found.
 654  *
 655  * Return: 0 on success, negative errno on error.
 656  */
 657 int __weak arch_kexec_locate_mem_hole(struct kexec_buf *kbuf)
 658 {
 659         return kexec_locate_mem_hole(kbuf);
 660 }
 661
 662 /**
 663  * kexec_add_buffer - place a buffer in a kexec segment
 664  * @kbuf:       Buffer contents and memory parameters.
 665  *
 666  * This function assumes that kexec_mutex is held.
 667  * On successful return, @kbuf->mem will have the physical address of
 668  * the buffer in memory.
 669  *
 670  * Return: 0 on success, negative errno on error.
 671  */
 672 int kexec_add_buffer(struct kexec_buf *kbuf)
 673 {
 674         struct kexec_segment *ksegment;
 675         int ret;
 676
 677         /* Currently adding segment this way is allowed only in file mode */
 678         if (!kbuf->image->file_mode)
 679                 return -EINVAL;
 680
 681         if (kbuf->image->nr_segments >= KEXEC_SEGMENT_MAX)
 682                 return -EINVAL;
 683
 684         /*
 685          * Make sure we are not trying to add buffer after allocating
 686          * control pages. All segments need to be placed first before
 687          * any control pages are allocated. As control page allocation
 688          * logic goes through list of segments to make sure there are
 689          * no destination overlaps.
 690          */
 691         if (!list_empty(&kbuf->image->control_pages)) {
 692                 WARN_ON(1);
 693                 return -EINVAL;
 694         }
 695
 696         /* Ensure minimum alignment needed for segments. */
 697         kbuf->memsz = ALIGN(kbuf->memsz, PAGE_SIZE);
 698         kbuf->buf_align = max(kbuf->buf_align, PAGE_SIZE);
 699
 700         /* Walk the RAM ranges and allocate a suitable range for the buffer */
 701         ret = arch_kexec_locate_mem_hole(kbuf);
 702         if (ret)
 703                 return ret;
 704
 705         /* Found a suitable memory range */
 706         ksegment = &kbuf->image->segment[kbuf->image->nr_segments];
 707         ksegment->kbuf = kbuf->buffer;
 708         ksegment->bufsz = kbuf->bufsz;
 709         ksegment->mem = kbuf->mem;
 710         ksegment->memsz = kbuf->memsz;
 711         kbuf->image->nr_segments++;
 712         return 0;
 713 }
 714
 715 /* Calculate and store the digest of segments */
 716 static int kexec_calculate_store_digests(struct kimage *image)
 717 {
 718         struct crypto_shash *tfm;
 719         struct shash_desc *desc;
 720         int ret = 0, i, j, zero_buf_sz, sha_region_sz;
 721         size_t desc_size, nullsz;
 722         char *digest;
 723         void *zero_buf;
 724         struct kexec_sha_region *sha_regions;
 725         struct purgatory_info *pi = &image->purgatory_info;
 726
 727         if (!IS_ENABLED(CONFIG_ARCH_HAS_KEXEC_PURGATORY))
 728                 return 0;
 729
 730         zero_buf = __va(page_to_pfn(ZERO_PAGE(0)) << PAGE_SHIFT);
 731         zero_buf_sz = PAGE_SIZE;
 732
 733         tfm = crypto_alloc_shash("sha256", 0, 0);
 734         if (IS_ERR(tfm)) {
 735                 ret = PTR_ERR(tfm);
 736                 goto out;
 737         }
 738
 739         desc_size = crypto_shash_descsize(tfm) + sizeof(*desc);
 740         desc = kzalloc(desc_size, GFP_KERNEL);
 741         if (!desc) {
 742                 ret = -ENOMEM;
 743                 goto out_free_tfm;
 744         }
 745
 746         sha_region_sz = KEXEC_SEGMENT_MAX * sizeof(struct kexec_sha_region);
 747         sha_regions = vzalloc(sha_region_sz);
 748         if (!sha_regions) {
 749                 ret = -ENOMEM;
 750                 goto out_free_desc;
 751         }
 752
 753         desc->tfm   = tfm;
 754
 755         ret = crypto_shash_init(desc);
 756         if (ret < 0)
 757                 goto out_free_sha_regions;
 758
 759         digest = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);
 760         if (!digest) {
 761                 ret = -ENOMEM;
 762                 goto out_free_sha_regions;
 763         }
 764
 765         for (j = i = 0; i < image->nr_segments; i++) {
 766                 struct kexec_segment *ksegment;
 767
 768                 ksegment = &image->segment[i];
 769                 /*
 770                  * Skip purgatory as it will be modified once we put digest
 771                  * info in purgatory.
 772                  */
 773                 if (ksegment->kbuf == pi->purgatory_buf)
 774                         continue;
 775
 776                 ret = crypto_shash_update(desc, ksegment->kbuf,
 777                                           ksegment->bufsz);
 778                 if (ret)
 779                         break;
 780
 781                 /*
 782                  * Assume rest of the buffer is filled with zero and
 783                  * update digest accordingly.
 784                  */
 785                 nullsz = ksegment->memsz - ksegment->bufsz;
 786                 while (nullsz) {
 787                         unsigned long bytes = nullsz;
 788
 789                         if (bytes > zero_buf_sz)
 790                                 bytes = zero_buf_sz;
 791                         ret = crypto_shash_update(desc, zero_buf, bytes);
 792                         if (ret)
 793                                 break;
 794                         nullsz -= bytes;
 795                 }
 796
 797                 if (ret)
 798                         break;
 799
 800                 sha_regions[j].start = ksegment->mem;
 801                 sha_regions[j].len = ksegment->memsz;
 802                 j++;
 803         }
 804
 805         if (!ret) {
 806                 ret = crypto_shash_final(desc, digest);
 807                 if (ret)
 808                         goto out_free_digest;
 809                 ret = kexec_purgatory_get_set_symbol(image, "purgatory_sha_regions",
 810                                                      sha_regions, sha_region_sz, 0);
 811                 if (ret)
 812                         goto out_free_digest;
 813
 814                 ret = kexec_purgatory_get_set_symbol(image, "purgatory_sha256_digest",
 815                                                      digest, SHA256_DIGEST_SIZE, 0);
 816                 if (ret)
 817                         goto out_free_digest;
 818         }
 819
 820 out_free_digest:
 821         kfree(digest);
 822 out_free_sha_regions:
 823         vfree(sha_regions);
 824 out_free_desc:
 825         kfree(desc);
 826 out_free_tfm:
 827         kfree(tfm);
 828 out:
 829         return ret;
 830 }
 831
 832 #ifdef CONFIG_ARCH_HAS_KEXEC_PURGATORY
 833 /*
 834  * kexec_purgatory_setup_kbuf - prepare buffer to load purgatory.
 835  * @pi:         Purgatory to be loaded.
 836  * @kbuf:       Buffer to setup.
 837  *
 838  * Allocates the memory needed for the buffer. Caller is responsible to free
 839  * the memory after use.
 840  *
 841  * Return: 0 on success, negative errno on error.
 842  */
 843 static int kexec_purgatory_setup_kbuf(struct purgatory_info *pi,
 844                                       struct kexec_buf *kbuf)
 845 {
 846         const Elf_Shdr *sechdrs;
 847         unsigned long bss_align;
 848         unsigned long bss_sz;
 849         unsigned long align;
 850         int i, ret;
 851
 852         sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff;
 853         kbuf->buf_align = bss_align = 1;
 854         kbuf->bufsz = bss_sz = 0;
 855
 856         for (i = 0; i < pi->ehdr->e_shnum; i++) {
 857                 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
 858                         continue;
 859
 860                 align = sechdrs[i].sh_addralign;
 861                 if (sechdrs[i].sh_type != SHT_NOBITS) {
 862                         if (kbuf->buf_align < align)
 863                                 kbuf->buf_align = align;
 864                         kbuf->bufsz = ALIGN(kbuf->bufsz, align);
 865                         kbuf->bufsz += sechdrs[i].sh_size;
 866                 } else {
 867                         if (bss_align < align)
 868                                 bss_align = align;
 869                         bss_sz = ALIGN(bss_sz, align);
 870                         bss_sz += sechdrs[i].sh_size;
 871                 }
 872         }
 873         kbuf->bufsz = ALIGN(kbuf->bufsz, bss_align);
 874         kbuf->memsz = kbuf->bufsz + bss_sz;
 875         if (kbuf->buf_align < bss_align)
 876                 kbuf->buf_align = bss_align;
 877
 878         kbuf->buffer = vzalloc(kbuf->bufsz);
 879         if (!kbuf->buffer)
 880                 return -ENOMEM;
 881         pi->purgatory_buf = kbuf->buffer;
 882
 883         ret = kexec_add_buffer(kbuf);
 884         if (ret)
 885                 goto out;
 886
 887         return 0;
 888 out:
 889         vfree(pi->purgatory_buf);
 890         pi->purgatory_buf = NULL;
 891         return ret;
 892 }
 893
 894 /*
 895  * kexec_purgatory_setup_sechdrs - prepares the pi->sechdrs buffer.
 896  * @pi:         Purgatory to be loaded.
 897  * @kbuf:       Buffer prepared to store purgatory.
 898  *
 899  * Allocates the memory needed for the buffer. Caller is responsible to free
 900  * the memory after use.
 901  *
 902  * Return: 0 on success, negative errno on error.
 903  */
 904 static int kexec_purgatory_setup_sechdrs(struct purgatory_info *pi,
 905                                          struct kexec_buf *kbuf)
 906 {
 907         unsigned long bss_addr;
 908         unsigned long offset;
 909         Elf_Shdr *sechdrs;
 910         int i;
 911
 912         /*
 913          * The section headers in kexec_purgatory are read-only. In order to
 914          * have them modifiable make a temporary copy.
 915          */
 916         sechdrs = vzalloc(array_size(sizeof(Elf_Shdr), pi->ehdr->e_shnum));
 917         if (!sechdrs)
 918                 return -ENOMEM;
 919         memcpy(sechdrs, (void *)pi->ehdr + pi->ehdr->e_shoff,
 920                pi->ehdr->e_shnum * sizeof(Elf_Shdr));
 921         pi->sechdrs = sechdrs;
 922
 923         offset = 0;
 924         bss_addr = kbuf->mem + kbuf->bufsz;
 925         kbuf->image->start = pi->ehdr->e_entry;
 926
 927         for (i = 0; i < pi->ehdr->e_shnum; i++) {
 928                 unsigned long align;
 929                 void *src, *dst;
 930
 931                 if (!(sechdrs[i].sh_flags & SHF_ALLOC))
 932                         continue;
 933
 934                 align = sechdrs[i].sh_addralign;
 935                 if (sechdrs[i].sh_type == SHT_NOBITS) {
 936                         bss_addr = ALIGN(bss_addr, align);
 937                         sechdrs[i].sh_addr = bss_addr;
 938                         bss_addr += sechdrs[i].sh_size;
 939                         continue;
 940                 }
 941
 942                 offset = ALIGN(offset, align);
 943                 if (sechdrs[i].sh_flags & SHF_EXECINSTR &&
 944                     pi->ehdr->e_entry >= sechdrs[i].sh_addr &&
 945                     pi->ehdr->e_entry < (sechdrs[i].sh_addr
 946                                          + sechdrs[i].sh_size)) {
 947                         kbuf->image->start -= sechdrs[i].sh_addr;
 948                         kbuf->image->start += kbuf->mem + offset;
 949                 }
 950
 951                 src = (void *)pi->ehdr + sechdrs[i].sh_offset;
 952                 dst = pi->purgatory_buf + offset;
 953                 memcpy(dst, src, sechdrs[i].sh_size);
 954
 955                 sechdrs[i].sh_addr = kbuf->mem + offset;
 956                 sechdrs[i].sh_offset = offset;
 957                 offset += sechdrs[i].sh_size;
 958         }
 959
 960         return 0;
 961 }
 962
 963 static int kexec_apply_relocations(struct kimage *image)
 964 {
 965         int i, ret;
 966         struct purgatory_info *pi = &image->purgatory_info;
 967         const Elf_Shdr *sechdrs;
 968
 969         sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff;
 970
 971         for (i = 0; i < pi->ehdr->e_shnum; i++) {
 972                 const Elf_Shdr *relsec;
 973                 const Elf_Shdr *symtab;
 974                 Elf_Shdr *section;
 975
 976                 relsec = sechdrs + i;
 977
 978                 if (relsec->sh_type != SHT_RELA &&
 979                     relsec->sh_type != SHT_REL)
 980                         continue;
 981
 982                 /*
 983                  * For section of type SHT_RELA/SHT_REL,
 984                  * ->sh_link contains section header index of associated
 985                  * symbol table. And ->sh_info contains section header
 986                  * index of section to which relocations apply.
 987                  */
 988                 if (relsec->sh_info >= pi->ehdr->e_shnum ||
 989                     relsec->sh_link >= pi->ehdr->e_shnum)
 990                         return -ENOEXEC;
 991
 992                 section = pi->sechdrs + relsec->sh_info;
 993                 symtab = sechdrs + relsec->sh_link;
 994
 995                 if (!(section->sh_flags & SHF_ALLOC))
 996                         continue;
 997
 998                 /*
 999                  * symtab->sh_link contain section header index of associated
1000                  * string table.
1001                  */
1002                 if (symtab->sh_link >= pi->ehdr->e_shnum)
1003                         /* Invalid section number? */
1004                         continue;
1005
1006                 /*
1007                  * Respective architecture needs to provide support for applying
1008                  * relocations of type SHT_RELA/SHT_REL.
1009                  */
1010                 if (relsec->sh_type == SHT_RELA)
1011                         ret = arch_kexec_apply_relocations_add(pi, section,
1012                                                                relsec, symtab);
1013                 else if (relsec->sh_type == SHT_REL)
1014                         ret = arch_kexec_apply_relocations(pi, section,
1015                                                            relsec, symtab);
1016                 if (ret)
1017                         return ret;
1018         }
1019
1020         return 0;
1021 }
1022
1023 /*
1024  * kexec_load_purgatory - Load and relocate the purgatory object.
1025  * @image:      Image to add the purgatory to.
1026  * @kbuf:       Memory parameters to use.
1027  *
1028  * Allocates the memory needed for image->purgatory_info.sechdrs and
1029  * image->purgatory_info.purgatory_buf/kbuf->buffer. Caller is responsible
1030  * to free the memory after use.
1031  *
1032  * Return: 0 on success, negative errno on error.
1033  */
1034 int kexec_load_purgatory(struct kimage *image, struct kexec_buf *kbuf)
1035 {
1036         struct purgatory_info *pi = &image->purgatory_info;
1037         int ret;
1038
1039         if (kexec_purgatory_size <= 0)
1040                 return -EINVAL;
1041
1042         pi->ehdr = (const Elf_Ehdr *)kexec_purgatory;
1043
1044         ret = kexec_purgatory_setup_kbuf(pi, kbuf);
1045         if (ret)
1046                 return ret;
1047
1048         ret = kexec_purgatory_setup_sechdrs(pi, kbuf);
1049         if (ret)
1050                 goto out_free_kbuf;
1051
1052         ret = kexec_apply_relocations(image);
1053         if (ret)
1054                 goto out;
1055
1056         return 0;
1057 out:
1058         vfree(pi->sechdrs);
1059         pi->sechdrs = NULL;
1060 out_free_kbuf:
1061         vfree(pi->purgatory_buf);
1062         pi->purgatory_buf = NULL;
1063         return ret;
1064 }
1065
1066 /*
1067  * kexec_purgatory_find_symbol - find a symbol in the purgatory
1068  * @pi:         Purgatory to search in.
1069  * @name:       Name of the symbol.
1070  *
1071  * Return: pointer to symbol in read-only symtab on success, NULL on error.
1072  */
1073 static const Elf_Sym *kexec_purgatory_find_symbol(struct purgatory_info *pi,
1074                                                   const char *name)
1075 {
1076         const Elf_Shdr *sechdrs;
1077         const Elf_Ehdr *ehdr;
1078         const Elf_Sym *syms;
1079         const char *strtab;
1080         int i, k;
1081
1082         if (!pi->ehdr)
1083                 return NULL;
1084
1085         ehdr = pi->ehdr;
1086         sechdrs = (void *)ehdr + ehdr->e_shoff;
1087
1088         for (i = 0; i < ehdr->e_shnum; i++) {
1089                 if (sechdrs[i].sh_type != SHT_SYMTAB)
1090                         continue;
1091
1092                 if (sechdrs[i].sh_link >= ehdr->e_shnum)
1093                         /* Invalid strtab section number */
1094                         continue;
1095                 strtab = (void *)ehdr + sechdrs[sechdrs[i].sh_link].sh_offset;
1096                 syms = (void *)ehdr + sechdrs[i].sh_offset;
1097
1098                 /* Go through symbols for a match */
1099                 for (k = 0; k < sechdrs[i].sh_size/sizeof(Elf_Sym); k++) {
1100                         if (ELF_ST_BIND(syms[k].st_info) != STB_GLOBAL)
1101                                 continue;
1102
1103                         if (strcmp(strtab + syms[k].st_name, name) != 0)
1104                                 continue;
1105
1106                         if (syms[k].st_shndx == SHN_UNDEF ||
1107                             syms[k].st_shndx >= ehdr->e_shnum) {
1108                                 pr_debug("Symbol: %s has bad section index %d.\n",
1109                                                 name, syms[k].st_shndx);
1110                                 return NULL;
1111                         }
1112
1113                         /* Found the symbol we are looking for */
1114                         return &syms[k];
1115                 }
1116         }
1117
1118         return NULL;
1119 }
1120
1121 void *kexec_purgatory_get_symbol_addr(struct kimage *image, const char *name)
1122 {
1123         struct purgatory_info *pi = &image->purgatory_info;
1124         const Elf_Sym *sym;
1125         Elf_Shdr *sechdr;
1126
1127         sym = kexec_purgatory_find_symbol(pi, name);
1128         if (!sym)
1129                 return ERR_PTR(-EINVAL);
1130
1131         sechdr = &pi->sechdrs[sym->st_shndx];
1132
1133         /*
1134          * Returns the address where symbol will finally be loaded after
1135          * kexec_load_segment()
1136          */
1137         return (void *)(sechdr->sh_addr + sym->st_value);
1138 }
1139
1140 /*
1141  * Get or set value of a symbol. If "get_value" is true, symbol value is
1142  * returned in buf otherwise symbol value is set based on value in buf.
1143  */
1144 int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name,
1145                                    void *buf, unsigned int size, bool get_value)
1146 {
1147         struct purgatory_info *pi = &image->purgatory_info;
1148         const Elf_Sym *sym;
1149         Elf_Shdr *sec;
1150         char *sym_buf;
1151
1152         sym = kexec_purgatory_find_symbol(pi, name);
1153         if (!sym)
1154                 return -EINVAL;
1155
1156         if (sym->st_size != size) {
1157                 pr_err("symbol %s size mismatch: expected %lu actual %u\n",
1158                        name, (unsigned long)sym->st_size, size);
1159                 return -EINVAL;
1160         }
1161
1162         sec = pi->sechdrs + sym->st_shndx;
1163
1164         if (sec->sh_type == SHT_NOBITS) {
1165                 pr_err("symbol %s is in a bss section. Cannot %s\n", name,
1166                        get_value ? "get" : "set");
1167                 return -EINVAL;
1168         }
1169
1170         sym_buf = (char *)pi->purgatory_buf + sec->sh_offset + sym->st_value;
1171
1172         if (get_value)
1173                 memcpy((void *)buf, sym_buf, size);
1174         else
1175                 memcpy((void *)sym_buf, buf, size);
1176
1177         return 0;
1178 }
1179 #endif /* CONFIG_ARCH_HAS_KEXEC_PURGATORY */
1180
1181 int crash_exclude_mem_range(struct crash_mem *mem,
1182                             unsigned long long mstart, unsigned long long mend)
1183 {
1184         int i, j;
1185         unsigned long long start, end, p_start, p_end;
1186         struct crash_mem_range temp_range = {0, 0};
1187
1188         for (i = 0; i < mem->nr_ranges; i++) {
1189                 start = mem->ranges[i].start;
1190                 end = mem->ranges[i].end;
1191                 p_start = mstart;
1192                 p_end = mend;
1193
1194                 if (mstart > end || mend < start)
1195                         continue;
1196
1197                 /* Truncate any area outside of range */
1198                 if (mstart < start)
1199                         p_start = start;
1200                 if (mend > end)
1201                         p_end = end;
1202
1203                 /* Found completely overlapping range */
1204                 if (p_start == start && p_end == end) {
1205                         mem->ranges[i].start = 0;
1206                         mem->ranges[i].end = 0;
1207                         if (i < mem->nr_ranges - 1) {
1208                                 /* Shift rest of the ranges to left */
1209                                 for (j = i; j < mem->nr_ranges - 1; j++) {
1210                                         mem->ranges[j].start =
1211                                                 mem->ranges[j+1].start;
1212                                         mem->ranges[j].end =
1213                                                         mem->ranges[j+1].end;
1214                                 }
1215
1216                                 /*
1217                                  * Continue to check if there are another overlapping ranges
1218                                  * from the current position because of shifting the above
1219                                  * mem ranges.
1220                                  */
1221                                 i--;
1222                                 mem->nr_ranges--;
1223                                 continue;
1224                         }
1225                         mem->nr_ranges--;
1226                         return 0;
1227                 }
1228
1229                 if (p_start > start && p_end < end) {
1230                         /* Split original range */
1231                         mem->ranges[i].end = p_start - 1;
1232                         temp_range.start = p_end + 1;
1233                         temp_range.end = end;
1234                 } else if (p_start != start)
1235                         mem->ranges[i].end = p_start - 1;
1236                 else
1237                         mem->ranges[i].start = p_end + 1;
1238                 break;
1239         }
1240
1241         /* If a split happened, add the split to array */
1242         if (!temp_range.end)
1243                 return 0;
1244
1245         /* Split happened */
1246         if (i == mem->max_nr_ranges - 1)
1247                 return -ENOMEM;
1248
1249         /* Location where new range should go */
1250         j = i + 1;
1251         if (j < mem->nr_ranges) {
1252                 /* Move over all ranges one slot towards the end */
1253                 for (i = mem->nr_ranges - 1; i >= j; i--)
1254                         mem->ranges[i + 1] = mem->ranges[i];
1255         }
1256
1257         mem->ranges[j].start = temp_range.start;
1258         mem->ranges[j].end = temp_range.end;
1259         mem->nr_ranges++;
1260         return 0;
1261 }
1262
1263 int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map,
1264                           void **addr, unsigned long *sz)
1265 {
1266         Elf64_Ehdr *ehdr;
1267         Elf64_Phdr *phdr;
1268         unsigned long nr_cpus = num_possible_cpus(), nr_phdr, elf_sz;
1269         unsigned char *buf;
1270         unsigned int cpu, i;
1271         unsigned long long notes_addr;
1272         unsigned long mstart, mend;
1273
1274         /* extra phdr for vmcoreinfo ELF note */
1275         nr_phdr = nr_cpus + 1;
1276         nr_phdr += mem->nr_ranges;
1277
1278         /*
1279          * kexec-tools creates an extra PT_LOAD phdr for kernel text mapping
1280          * area (for example, ffffffff80000000 - ffffffffa0000000 on x86_64).
1281          * I think this is required by tools like gdb. So same physical
1282          * memory will be mapped in two ELF headers. One will contain kernel
1283          * text virtual addresses and other will have __va(physical) addresses.
1284          */
1285
1286         nr_phdr++;
1287         elf_sz = sizeof(Elf64_Ehdr) + nr_phdr * sizeof(Elf64_Phdr);
1288         elf_sz = ALIGN(elf_sz, ELF_CORE_HEADER_ALIGN);
1289
1290         buf = vzalloc(elf_sz);
1291         if (!buf)
1292                 return -ENOMEM;
1293
1294         ehdr = (Elf64_Ehdr *)buf;
1295         phdr = (Elf64_Phdr *)(ehdr + 1);
1296         memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
1297         ehdr->e_ident[EI_CLASS] = ELFCLASS64;
1298         ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
1299         ehdr->e_ident[EI_VERSION] = EV_CURRENT;
1300         ehdr->e_ident[EI_OSABI] = ELF_OSABI;
1301         memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD);
1302         ehdr->e_type = ET_CORE;
1303         ehdr->e_machine = ELF_ARCH;
1304         ehdr->e_version = EV_CURRENT;
1305         ehdr->e_phoff = sizeof(Elf64_Ehdr);
1306         ehdr->e_ehsize = sizeof(Elf64_Ehdr);
1307         ehdr->e_phentsize = sizeof(Elf64_Phdr);
1308
1309         /* Prepare one phdr of type PT_NOTE for each present CPU */
1310         for_each_present_cpu(cpu) {
1311                 phdr->p_type = PT_NOTE;
1312                 notes_addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpu));
1313                 phdr->p_offset = phdr->p_paddr = notes_addr;
1314                 phdr->p_filesz = phdr->p_memsz = sizeof(note_buf_t);
1315                 (ehdr->e_phnum)++;
1316                 phdr++;
1317         }
1318
1319         /* Prepare one PT_NOTE header for vmcoreinfo */
1320         phdr->p_type = PT_NOTE;
1321         phdr->p_offset = phdr->p_paddr = paddr_vmcoreinfo_note();
1322         phdr->p_filesz = phdr->p_memsz = VMCOREINFO_NOTE_SIZE;
1323         (ehdr->e_phnum)++;
1324         phdr++;
1325
1326         /* Prepare PT_LOAD type program header for kernel text region */
1327         if (kernel_map) {
1328                 phdr->p_type = PT_LOAD;
1329                 phdr->p_flags = PF_R|PF_W|PF_X;
1330                 phdr->p_vaddr = (unsigned long) _text;
1331                 phdr->p_filesz = phdr->p_memsz = _end - _text;
1332                 phdr->p_offset = phdr->p_paddr = __pa_symbol(_text);
1333                 ehdr->e_phnum++;
1334                 phdr++;
1335         }
1336
1337         /* Go through all the ranges in mem->ranges[] and prepare phdr */
1338         for (i = 0; i < mem->nr_ranges; i++) {
1339                 mstart = mem->ranges[i].start;
1340                 mend = mem->ranges[i].end;
1341
1342                 phdr->p_type = PT_LOAD;
1343                 phdr->p_flags = PF_R|PF_W|PF_X;
1344                 phdr->p_offset  = mstart;
1345
1346                 phdr->p_paddr = mstart;
1347                 phdr->p_vaddr = (unsigned long) __va(mstart);
1348                 phdr->p_filesz = phdr->p_memsz = mend - mstart + 1;
1349                 phdr->p_align = 0;
1350                 ehdr->e_phnum++;
1351                 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",
1352                         phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz,
1353                         ehdr->e_phnum, phdr->p_offset);
1354                 phdr++;
1355         }
1356
1357         *addr = buf;
1358         *sz = elf_sz;
1359         return 0;
1360 }