avb_kernel_cmdline_descriptor.c 1.2 KB

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  1. // SPDX-License-Identifier: MIT
  2. /*
  3. * Copyright (C) 2016 The Android Open Source Project
  4. */
  5. #include "avb_kernel_cmdline_descriptor.h"
  6. #include "avb_util.h"
  7. bool avb_kernel_cmdline_descriptor_validate_and_byteswap(
  8. const AvbKernelCmdlineDescriptor* src, AvbKernelCmdlineDescriptor* dest) {
  9. uint64_t expected_size;
  10. avb_memcpy(dest, src, sizeof(AvbKernelCmdlineDescriptor));
  11. if (!avb_descriptor_validate_and_byteswap((const AvbDescriptor*)src,
  12. (AvbDescriptor*)dest))
  13. return false;
  14. if (dest->parent_descriptor.tag != AVB_DESCRIPTOR_TAG_KERNEL_CMDLINE) {
  15. avb_error("Invalid tag for kernel cmdline descriptor.\n");
  16. return false;
  17. }
  18. dest->flags = avb_be32toh(dest->flags);
  19. dest->kernel_cmdline_length = avb_be32toh(dest->kernel_cmdline_length);
  20. /* Check that kernel_cmdline is fully contained. */
  21. expected_size = sizeof(AvbKernelCmdlineDescriptor) - sizeof(AvbDescriptor);
  22. if (!avb_safe_add_to(&expected_size, dest->kernel_cmdline_length)) {
  23. avb_error("Overflow while adding up sizes.\n");
  24. return false;
  25. }
  26. if (expected_size > dest->parent_descriptor.num_bytes_following) {
  27. avb_error("Descriptor payload size overflow.\n");
  28. return false;
  29. }
  30. return true;
  31. }