1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * SPDX-License-Identifier: MIT 5 */ 6 7 #include "avb_footer.h" 8 #include "avb_util.h" 9 10 bool avb_footer_validate_and_byteswap(const AvbFooter* src, AvbFooter* dest) { 11 avb_memcpy(dest, src, sizeof(AvbFooter)); 12 13 dest->version_major = avb_be32toh(dest->version_major); 14 dest->version_minor = avb_be32toh(dest->version_minor); 15 16 dest->original_image_size = avb_be64toh(dest->original_image_size); 17 dest->vbmeta_offset = avb_be64toh(dest->vbmeta_offset); 18 dest->vbmeta_size = avb_be64toh(dest->vbmeta_size); 19 20 /* Check that magic is correct. */ 21 if (avb_safe_memcmp(dest->magic, AVB_FOOTER_MAGIC, AVB_FOOTER_MAGIC_LEN) != 22 0) { 23 avb_error("Footer magic is incorrect.\n"); 24 return false; 25 } 26 27 /* Ensure we don't attempt to access any fields if the footer major 28 * version is not supported. 29 */ 30 if (dest->version_major > AVB_FOOTER_VERSION_MAJOR) { 31 avb_error("No support for footer version.\n"); 32 return false; 33 } 34 35 return true; 36 } 37