Merge "Copying debug ramdisk files to /debug_ramdisk/*" (b1eba916) · Commits · e / os / android_system_core

init/Android.bp

+1 −0

Original line number	Diff line number	Diff line
		@@ -61,6 +61,7 @@ cc_defaults {
		static_libs: [
		"libseccomp_policy",
		"libavb",
		"libc++fs",
		"libcgrouprc_format",
		"libprotobuf-cpp-lite",
		"libpropertyinfoserializer",

init/Android.mk

+2 −0

Original line number	Diff line number	Diff line
		@@ -68,12 +68,14 @@ LOCAL_UNSTRIPPED_PATH := $(TARGET_RAMDISK_OUT_UNSTRIPPED)
		# Set up the same mount points on the ramdisk that system-as-root contains.
		LOCAL_POST_INSTALL_CMD := mkdir -p \
		$(TARGET_RAMDISK_OUT)/apex \
		$(TARGET_RAMDISK_OUT)/debug_ramdisk \
		$(TARGET_RAMDISK_OUT)/dev \
		$(TARGET_RAMDISK_OUT)/mnt \
		$(TARGET_RAMDISK_OUT)/proc \
		$(TARGET_RAMDISK_OUT)/sys \

		LOCAL_STATIC_LIBRARIES := \
		libc++fs \
		libfs_avb \
		libfs_mgr \
		libfec \

init/debug_ramdisk.h

0 → 100644

+26 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2019 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#pragma once

		namespace android {
		namespace init {

		constexpr const char kDebugRamdiskProp[] = "/debug_ramdisk/adb_debug.prop";
		constexpr const char kDebugRamdiskSEPolicy[] = "/debug_ramdisk/userdebug_plat_sepolicy.cil";

		} // namespace init
		} // namespace android

init/first_stage_init.cpp

+15 −1

Original line number	Diff line number	Diff line
		@@ -26,6 +26,7 @@
		#include <sys/types.h>
		#include <unistd.h>

		#include <filesystem>
		#include <string>
		#include <vector>

		@@ -35,6 +36,7 @@
		#include <cutils/android_reboot.h>
		#include <private/android_filesystem_config.h>

		#include "debug_ramdisk.h"
		#include "first_stage_mount.h"
		#include "reboot_utils.h"
		#include "switch_root.h"
		@@ -44,6 +46,8 @@ using android::base::boot_clock;

		using namespace std::literals;

		namespace fs = std::filesystem;

		namespace android {
		namespace init {

		@@ -159,6 +163,9 @@ int FirstStageMain(int argc, char** argv) {
		CHECKCALL(mount("tmpfs", "/apex", "tmpfs", MS_NOEXEC \| MS_NOSUID \| MS_NODEV,
		"mode=0755,uid=0,gid=0"));

		// /debug_ramdisk is used to preserve additional files from the debug ramdisk
		CHECKCALL(mount("tmpfs", "/debug_ramdisk", "tmpfs", MS_NOEXEC \| MS_NOSUID \| MS_NODEV,
		"mode=0755,uid=0,gid=0"));
		#undef CHECKCALL

		// Now that tmpfs is mounted on /dev and we have /dev/kmsg, we can actually
		@@ -202,8 +209,15 @@ int FirstStageMain(int argc, char** argv) {
		// If this file is present, the second-stage init will use a userdebug sepolicy
		// and load adb_debug.prop to allow adb root, if the device is unlocked.
		if (access("/force_debuggable", F_OK) == 0) {
		std::error_code ec; // to invoke the overloaded copy_file() that won't throw.
		if (!fs::copy_file("/adb_debug.prop", kDebugRamdiskProp, ec) \|\|
		!fs::copy_file("/userdebug_plat_sepolicy.cil", kDebugRamdiskSEPolicy, ec)) {
		LOG(ERROR) << "Failed to setup debug ramdisk";
		} else {
		// setenv for second-stage init to read above kDebugRamdisk* files.
		setenv("INIT_FORCE_DEBUGGABLE", "true", 1);
		}
		}

		if (!DoFirstStageMount()) {
		LOG(FATAL) << "Failed to mount required partitions early ...";

init/init.cpp

+7 −0

Original line number	Diff line number	Diff line
		@@ -621,6 +621,12 @@ static void GlobalSeccomp() {
		});
		}

		static void UmountDebugRamdisk() {
		if (umount("/debug_ramdisk") != 0) {
		LOG(ERROR) << "Failed to umount /debug_ramdisk";
		}
		}

		int SecondStageMain(int argc, char** argv) {
		if (REBOOT_BOOTLOADER_ON_PANIC) {
		InstallRebootSignalHandlers();
		@@ -690,6 +696,7 @@ int SecondStageMain(int argc, char** argv) {
		InstallSignalFdHandler(&epoll);

		property_load_boot_defaults(load_debug_prop);
		UmountDebugRamdisk();
		fs_mgr_vendor_overlay_mount_all();
		export_oem_lock_status();
		StartPropertyService(&epoll);