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