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