6dd098cb1e
This commit constructs the super_vbmeta image to eliminate the need of adding /vbmeta_system and/or /vbmeta_vendor when AVB chain partition is used with Android Dynamic Partition. See BOARD_AVB_VBMETA_SYSTEM under the link: https://android.googlesource.com/platform/external/avb/#build-system-integration The structure of super_vbmeta : | VBMeta Table | (fixed-length 2KiB) | Backup VBMeta Table | (fixed-length 2KiB) | VBMeta Images | (fixed-length 64KiB each) The structure of VBMeta Table : | Super VBMeta Header | (fixed-length 128B) | VBMeta Descriptors | (variable-length) The VBMeta Table records the slot number of each vbmeta image within the /super_vbmeta partition. Bug: 137054296 Test: m libvbmeta_test Test: ./out/host/linux-x86/nativetest/libvbmeta_test/libvbmeta_test Change-Id: I01aeadd850750ae87d9125484c1b1f570bb84756
81 lines
No EOL
2.6 KiB
C++
81 lines
No EOL
2.6 KiB
C++
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "writer.h"
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#include <android-base/file.h>
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#include "utility.h"
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using android::base::ErrnoError;
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using android::base::Result;
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namespace android {
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namespace fs_mgr {
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std::string SerializeVBMetaTable(const VBMetaTable& input) {
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std::string table;
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table.append(reinterpret_cast<const char*>(&input.header), SUPER_VBMETA_HEADER_SIZE);
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for (const auto& desc : input.descriptors) {
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table.append(reinterpret_cast<const char*>(&desc), SUPER_VBMETA_DESCRIPTOR_SIZE);
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table.append(desc.vbmeta_name);
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}
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// Ensure the size of vbmeta table is SUPER_VBMETA_TABLE_MAX_SIZE
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table.resize(SUPER_VBMETA_TABLE_MAX_SIZE, '\0');
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return table;
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}
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Result<void> WritePrimaryVBMetaTable(int fd, const std::string& table) {
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const uint64_t offset = PRIMARY_SUPER_VBMETA_TABLE_OFFSET;
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if (lseek(fd, offset, SEEK_SET) < 0) {
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return ErrnoError() << __PRETTY_FUNCTION__ << " lseek failed";
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}
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if (!android::base::WriteFully(fd, table.data(), table.size())) {
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return ErrnoError() << "Failed to write primary vbmeta table at offset " << offset;
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}
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return {};
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}
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Result<void> WriteBackupVBMetaTable(int fd, const std::string& table) {
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const uint64_t offset = BACKUP_SUPER_VBMETA_TABLE_OFFSET;
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if (lseek(fd, offset, SEEK_SET) < 0) {
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return ErrnoError() << __PRETTY_FUNCTION__ << " lseek failed";
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}
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if (!android::base::WriteFully(fd, table.data(), table.size())) {
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return ErrnoError() << "Failed to write backup vbmeta table at offset " << offset;
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}
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return {};
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}
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Result<void> WriteVBMetaImage(int fd, const uint8_t slot_number, const std::string& vbmeta_image) {
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const uint64_t offset = IndexOffset(slot_number);
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if (lseek(fd, offset, SEEK_SET) < 0) {
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return ErrnoError() << __PRETTY_FUNCTION__ << " lseek failed";
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}
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if (!android::base::WriteFully(fd, vbmeta_image.data(), vbmeta_image.size())) {
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return ErrnoError() << "Failed to write vbmeta image at offset " << offset;
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}
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return {};
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}
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} // namespace fs_mgr
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} // namespace android
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