3d57c84476
The layout of the vendor space /misc partition was pretty confusing and lead to some usage conflicts. To formalize the layout, we create a pixel specific library with the definition & offset of various flags. The new library also handles the R/W. As a result, we will leave system domain /misc definitions in the libbootloader_message. We also switch the misc_writer binary to use more specific options instead of writing an arbitrary hex string. So we can avoid redefining the string & offset in both init script and recovery ui. Bug: 131775112 Test: unit tests pass, run misc_writer and check contents of /misc Change-Id: I00f8842a81d1929e31a1de4d5eb09575ffad47c0
84 lines
2.9 KiB
C++
84 lines
2.9 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 "misc_writer/misc_writer.h"
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#include <string.h>
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#include <android-base/file.h>
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#include <android-base/logging.h>
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#include <android-base/stringprintf.h>
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#include <bootloader_message/bootloader_message.h>
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namespace android {
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namespace hardware {
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namespace google {
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namespace pixel {
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bool MiscWriter::OffsetAndSizeInVendorSpace(size_t offset, size_t size) {
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auto total_size = WIPE_PACKAGE_OFFSET_IN_MISC - VENDOR_SPACE_OFFSET_IN_MISC;
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return size <= total_size && offset <= total_size - size;
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}
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bool MiscWriter::WriteMiscPartitionVendorSpace(const void* data, size_t size, size_t offset,
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std::string* err) {
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if (!OffsetAndSizeInVendorSpace(offset, size)) {
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*err = android::base::StringPrintf("Out of bound write (offset %zu size %zu)", offset, size);
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return false;
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}
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auto misc_blk_device = get_misc_blk_device(err);
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if (misc_blk_device.empty()) {
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return false;
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}
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return write_misc_partition(data, size, misc_blk_device, VENDOR_SPACE_OFFSET_IN_MISC + offset,
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err);
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}
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bool MiscWriter::PerformAction(std::optional<size_t> override_offset) {
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size_t offset = 0;
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std::string content;
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switch (action_) {
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case MiscWriterActions::kSetDarkThemeFlag:
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case MiscWriterActions::kClearDarkThemeFlag:
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offset = override_offset.value_or(kThemeFlagOffsetInVendorSpace);
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content = (action_ == MiscWriterActions::kSetDarkThemeFlag)
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? kDarkThemeFlag
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: std::string(strlen(kDarkThemeFlag), 0);
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break;
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case MiscWriterActions::kSetSotaFlag:
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case MiscWriterActions::kClearSotaFlag:
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offset = override_offset.value_or(kSotaFlagOffsetInVendorSpace);
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content = (action_ == MiscWriterActions::kSetSotaFlag) ? kSotaFlag
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: std::string(strlen(kSotaFlag), 0);
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break;
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case MiscWriterActions::kUnset:
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LOG(ERROR) << "The misc writer action must be set";
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return false;
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}
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if (std::string err;
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!WriteMiscPartitionVendorSpace(content.data(), content.size(), offset, &err)) {
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LOG(ERROR) << "Failed to write " << content << " at offset " << offset << " : " << err;
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return false;
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}
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return true;
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}
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} // namespace pixel
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} // namespace google
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} // namespace hardware
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} // namespace android
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