49ecca71b5
Android init will refuse to read files that are world writable. Since adb push makes files world writable by default, this means that adb pushed rc files cannot be read by init. Fix it by adding an fs_config entry for *.rc that sets their permissions to 644 root:root. Bug: 343370899 Change-Id: If9c4dd4796caae6d177d9fdeef880949e5639648
418 lines
20 KiB
C++
418 lines
20 KiB
C++
/*
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* Copyright (C) 2007 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 <private/fs_config.h>
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// This file is used to define the properties of the filesystem
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// images generated by build tools (mkbootfs and mkyaffs2image) and
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// by the device side of adb.
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#define LOG_TAG "fs_config"
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#include <errno.h>
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#include <fcntl.h>
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#include <fnmatch.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <string>
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#include <android-base/strings.h>
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#include <cutils/fs.h>
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#include <log/log.h>
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#include <private/android_filesystem_config.h>
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#include "fs_config.h"
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using android::base::EndsWith;
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using android::base::StartsWith;
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#define ALIGN(x, alignment) (((x) + ((alignment)-1)) & ~((alignment)-1))
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#define CAP_MASK_LONG(cap_name) (1ULL << (cap_name))
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// Rules for directories.
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// These rules are applied based on "first match", so they
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// should start with the most specific path and work their
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// way up to the root.
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static const struct fs_path_config android_dirs[] = {
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// clang-format off
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{ 00770, AID_SYSTEM, AID_CACHE, 0, "cache" },
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{ 00555, AID_ROOT, AID_ROOT, 0, "config" },
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{ 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/app" },
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{ 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/app-private" },
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{ 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/app-ephemeral" },
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{ 00771, AID_ROOT, AID_ROOT, 0, "data/dalvik-cache" },
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{ 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/data" },
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{ 00771, AID_SHELL, AID_SHELL, 0, "data/local/tmp" },
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{ 00771, AID_SHELL, AID_SHELL, 0, "data/local" },
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{ 00770, AID_DHCP, AID_DHCP, 0, "data/misc/dhcp" },
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{ 00771, AID_SHARED_RELRO, AID_SHARED_RELRO, 0, "data/misc/shared_relro" },
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{ 01771, AID_SYSTEM, AID_MISC, 0, "data/misc" },
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{ 00775, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media/Music" },
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{ 00775, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media" },
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{ 00750, AID_ROOT, AID_SHELL, 0, "data/nativetest" },
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{ 00750, AID_ROOT, AID_SHELL, 0, "data/nativetest64" },
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{ 00750, AID_ROOT, AID_SHELL, 0, "data/benchmarktest" },
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{ 00750, AID_ROOT, AID_SHELL, 0, "data/benchmarktest64" },
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{ 00775, AID_ROOT, AID_ROOT, 0, "data/preloads" },
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{ 00771, AID_SYSTEM, AID_SYSTEM, 0, "data" },
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{ 00755, AID_ROOT, AID_SYSTEM, 0, "mnt" },
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{ 00751, AID_ROOT, AID_SHELL, 0, "product/bin" },
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{ 00751, AID_ROOT, AID_SHELL, 0, "product/apex/*/bin" },
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{ 00777, AID_ROOT, AID_ROOT, 0, "sdcard" },
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{ 00751, AID_ROOT, AID_SDCARD_R, 0, "storage" },
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{ 00750, AID_ROOT, AID_SYSTEM, 0, "system/apex/com.android.tethering/bin/for-system" },
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{ 00751, AID_ROOT, AID_SHELL, 0, "system/bin" },
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{ 00755, AID_ROOT, AID_ROOT, 0, "system/etc/ppp" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "system/vendor" },
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{ 00750, AID_ROOT, AID_SHELL, 0, "system/xbin" },
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{ 00751, AID_ROOT, AID_SHELL, 0, "system/apex/*/bin" },
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{ 00750, AID_ROOT, AID_SYSTEM, 0, "system_ext/apex/com.android.tethering/bin/for-system" },
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{ 00751, AID_ROOT, AID_SHELL, 0, "system_ext/bin" },
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{ 00751, AID_ROOT, AID_SHELL, 0, "system_ext/apex/*/bin" },
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{ 00751, AID_ROOT, AID_SHELL, 0, "vendor/bin" },
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{ 00751, AID_ROOT, AID_SHELL, 0, "vendor/apex/*/bin" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "vendor" },
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{},
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// clang-format on
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};
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#ifndef __ANDROID_VNDK__
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auto __for_testing_only__android_dirs = android_dirs;
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#endif
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// Rules for files.
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// These rules are applied based on "first match", so they
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// should start with the most specific path and work their
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// way up to the root. Prefixes ending in * denotes wildcard
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// and will allow partial matches.
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static const char sys_conf_dir[] = "/system/etc/fs_config_dirs";
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static const char sys_conf_file[] = "/system/etc/fs_config_files";
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// No restrictions are placed on the vendor and oem file-system config files,
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// although the developer is advised to restrict the scope to the /vendor or
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// oem/ file-system since the intent is to provide support for customized
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// portions of a separate vendor.img or oem.img. Has to remain open so that
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// customization can also land on /system/vendor, /system/oem, /system/odm,
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// /system/product or /system/system_ext.
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//
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// We expect build-time checking or filtering when constructing the associated
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// fs_config_* files (see build/tools/fs_config/fs_config_generate.c)
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static const char ven_conf_dir[] = "/vendor/etc/fs_config_dirs";
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static const char ven_conf_file[] = "/vendor/etc/fs_config_files";
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static const char oem_conf_dir[] = "/oem/etc/fs_config_dirs";
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static const char oem_conf_file[] = "/oem/etc/fs_config_files";
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static const char odm_conf_dir[] = "/odm/etc/fs_config_dirs";
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static const char odm_conf_file[] = "/odm/etc/fs_config_files";
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static const char product_conf_dir[] = "/product/etc/fs_config_dirs";
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static const char product_conf_file[] = "/product/etc/fs_config_files";
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static const char system_ext_conf_dir[] = "/system_ext/etc/fs_config_dirs";
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static const char system_ext_conf_file[] = "/system_ext/etc/fs_config_files";
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static const char* conf[][2] = {
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{sys_conf_file, sys_conf_dir}, {ven_conf_file, ven_conf_dir},
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{oem_conf_file, oem_conf_dir}, {odm_conf_file, odm_conf_dir},
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{product_conf_file, product_conf_dir}, {system_ext_conf_file, system_ext_conf_dir},
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};
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// Do not use android_files to grant Linux capabilities. Use ambient capabilities in their
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// associated init.rc file instead. See https://source.android.com/devices/tech/config/ambient.
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// Do not place any new vendor/, data/vendor/, etc entries in android_files.
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// Vendor entries should be done via a vendor or device specific config.fs.
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// See https://source.android.com/devices/tech/config/filesystem#using-file-system-capabilities
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static const struct fs_path_config android_files[] = {
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// clang-format off
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{ 00644, AID_SYSTEM, AID_SYSTEM, 0, "data/app/*" },
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{ 00644, AID_SYSTEM, AID_SYSTEM, 0, "data/app-ephemeral/*" },
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{ 00644, AID_SYSTEM, AID_SYSTEM, 0, "data/app-private/*" },
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{ 00644, AID_APP, AID_APP, 0, "data/data/*" },
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{ 00644, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media/*" },
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{ 00640, AID_ROOT, AID_SHELL, 0, "data/nativetest/tests.txt" },
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{ 00640, AID_ROOT, AID_SHELL, 0, "data/nativetest64/tests.txt" },
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{ 00750, AID_ROOT, AID_SHELL, 0, "data/nativetest/*" },
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{ 00750, AID_ROOT, AID_SHELL, 0, "data/nativetest64/*" },
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{ 00750, AID_ROOT, AID_SHELL, 0, "data/benchmarktest/*" },
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{ 00750, AID_ROOT, AID_SHELL, 0, "data/benchmarktest64/*" },
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{ 00600, AID_ROOT, AID_ROOT, 0, "default.prop" }, // legacy
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{ 00600, AID_ROOT, AID_ROOT, 0, "system/etc/prop.default" },
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{ 00600, AID_ROOT, AID_ROOT, 0, "odm/build.prop" }, // legacy; only for P release
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{ 00600, AID_ROOT, AID_ROOT, 0, "odm/default.prop" }, // legacy; only for P release
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{ 00600, AID_ROOT, AID_ROOT, 0, "odm/etc/build.prop" },
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{ 00444, AID_ROOT, AID_ROOT, 0, odm_conf_dir + 1 },
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{ 00444, AID_ROOT, AID_ROOT, 0, odm_conf_file + 1 },
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{ 00444, AID_ROOT, AID_ROOT, 0, oem_conf_dir + 1 },
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{ 00444, AID_ROOT, AID_ROOT, 0, oem_conf_file + 1 },
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{ 00600, AID_ROOT, AID_ROOT, 0, "product/build.prop" },
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{ 00444, AID_ROOT, AID_ROOT, 0, product_conf_dir + 1 },
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{ 00444, AID_ROOT, AID_ROOT, 0, product_conf_file + 1 },
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{ 00600, AID_ROOT, AID_ROOT, 0, "system_ext/build.prop" },
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{ 00444, AID_ROOT, AID_ROOT, 0, system_ext_conf_dir + 1 },
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{ 00444, AID_ROOT, AID_ROOT, 0, system_ext_conf_file + 1 },
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{ 00755, AID_ROOT, AID_SHELL, 0, "system/bin/crash_dump32" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "system/bin/crash_dump64" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "system/bin/debuggerd" },
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{ 00550, AID_LOGD, AID_LOGD, 0, "system/bin/logd" },
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{ 00700, AID_ROOT, AID_ROOT, 0, "system/bin/secilc" },
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{ 00750, AID_ROOT, AID_ROOT, 0, "system/bin/uncrypt" },
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{ 00600, AID_ROOT, AID_ROOT, 0, "system/build.prop" },
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{ 00444, AID_ROOT, AID_ROOT, 0, sys_conf_dir + 1 },
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{ 00444, AID_ROOT, AID_ROOT, 0, sys_conf_file + 1 },
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{ 00440, AID_ROOT, AID_SHELL, 0, "system/etc/init.goldfish.rc" },
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{ 00550, AID_ROOT, AID_SHELL, 0, "system/etc/init.goldfish.sh" },
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{ 00550, AID_ROOT, AID_SHELL, 0, "system/etc/init.ril" },
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{ 00555, AID_ROOT, AID_ROOT, 0, "system/etc/ppp/*" },
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{ 00555, AID_ROOT, AID_ROOT, 0, "system/etc/rc.*" },
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{ 00750, AID_ROOT, AID_ROOT, 0, "vendor/bin/install-recovery.sh" },
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{ 00600, AID_ROOT, AID_ROOT, 0, "vendor/build.prop" },
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{ 00600, AID_ROOT, AID_ROOT, 0, "vendor/default.prop" },
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{ 00440, AID_ROOT, AID_ROOT, 0, "vendor/etc/recovery.img" },
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{ 00444, AID_ROOT, AID_ROOT, 0, ven_conf_dir + 1 },
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{ 00444, AID_ROOT, AID_ROOT, 0, ven_conf_file + 1 },
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// the following two files are INTENTIONALLY set-uid, but they
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// are NOT included on user builds.
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{ 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/procmem" },
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{ 04750, AID_ROOT, AID_SHELL, 0, "system/xbin/su" },
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// the following files have enhanced capabilities and ARE included
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// in user builds.
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{ 06755, AID_CLAT, AID_CLAT, 0, "system/apex/com.android.tethering/bin/for-system/clatd" },
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{ 06755, AID_CLAT, AID_CLAT, 0, "system_ext/apex/com.android.tethering/bin/for-system/clatd" },
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{ 00700, AID_SYSTEM, AID_SHELL, CAP_MASK_LONG(CAP_BLOCK_SUSPEND),
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"system/bin/inputflinger" },
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{ 00750, AID_ROOT, AID_SHELL, CAP_MASK_LONG(CAP_SETUID) |
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CAP_MASK_LONG(CAP_SETGID),
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"system/bin/run-as" },
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{ 00750, AID_ROOT, AID_SHELL, CAP_MASK_LONG(CAP_SETUID) |
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CAP_MASK_LONG(CAP_SETGID),
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"system/bin/simpleperf_app_runner" },
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{ 00755, AID_ROOT, AID_ROOT, 0, "first_stage_ramdisk/system/bin/e2fsck" },
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#ifdef __LP64__
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{ 00755, AID_ROOT, AID_ROOT, 0, "first_stage_ramdisk/system/bin/linker64" },
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#else
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{ 00755, AID_ROOT, AID_ROOT, 0, "first_stage_ramdisk/system/bin/linker" },
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#endif
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{ 00755, AID_ROOT, AID_ROOT, 0, "first_stage_ramdisk/system/bin/resize2fs" },
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{ 00755, AID_ROOT, AID_ROOT, 0, "first_stage_ramdisk/system/bin/snapuserd" },
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{ 00755, AID_ROOT, AID_ROOT, 0, "first_stage_ramdisk/system/bin/snapuserd_ramdisk" },
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{ 00755, AID_ROOT, AID_ROOT, 0, "first_stage_ramdisk/system/bin/tune2fs" },
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{ 00755, AID_ROOT, AID_ROOT, 0, "first_stage_ramdisk/system/bin/fsck.f2fs" },
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// generic defaults
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{ 00755, AID_ROOT, AID_ROOT, 0, "bin/*" },
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{ 00640, AID_ROOT, AID_SHELL, 0, "fstab.*" },
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{ 00750, AID_ROOT, AID_SHELL, 0, "init*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "*.rc" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "odm/bin/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "odm/framework/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "odm/app/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "odm/priv-app/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "product/bin/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "product/apex/*bin/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "product/framework/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "product/app/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "product/priv-app/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "system/bin/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "system/xbin/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "system/apex/*/bin/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "system/framework/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "system/app/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "system/priv-app/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "system_ext/bin/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "system_ext/apex/*/bin/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "system_ext/framework/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "system_ext/app/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "system_ext/priv-app/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "vendor/bin/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "vendor/apex/*bin/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "vendor/xbin/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "vendor/framework/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "vendor/app/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, "vendor/priv-app/*" },
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{},
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// clang-format on
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};
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#ifndef __ANDROID_VNDK__
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auto __for_testing_only__android_files = android_files;
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#endif
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static size_t strip(const char* path, size_t len, const char suffix[]) {
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if (len < strlen(suffix)) return len;
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if (strncmp(path + len - strlen(suffix), suffix, strlen(suffix))) return len;
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return len - strlen(suffix);
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}
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static int fs_config_open(int dir, int which, const char* target_out_path) {
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int fd = -1;
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if (target_out_path && *target_out_path) {
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// target_out_path is the path to the directory holding content of
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// system partition but as we cannot guarantee it ends with '/system'
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// or with or without a trailing slash, need to strip them carefully.
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char* name = NULL;
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size_t len = strlen(target_out_path);
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len = strip(target_out_path, len, "/");
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len = strip(target_out_path, len, "/system");
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if (asprintf(&name, "%.*s%s", (int)len, target_out_path, conf[which][dir]) != -1) {
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fd = TEMP_FAILURE_RETRY(open(name, O_RDONLY));
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free(name);
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}
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}
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if (fd < 0) {
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fd = TEMP_FAILURE_RETRY(open(conf[which][dir], O_RDONLY));
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}
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return fd;
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}
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// if path is "odm/<stuff>", "oem/<stuff>", "product/<stuff>",
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// "system_ext/<stuff>" or "vendor/<stuff>"
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static bool is_partition(const std::string& path) {
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static const char* partitions[] = {"odm/", "oem/", "product/", "system_ext/", "vendor/"};
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for (size_t i = 0; i < (sizeof(partitions) / sizeof(partitions[0])); ++i) {
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if (StartsWith(path, partitions[i])) return true;
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}
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return false;
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}
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// alias prefixes of "<partition>/<stuff>" to "system/<partition>/<stuff>" or
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// "system/<partition>/<stuff>" to "<partition>/<stuff>"
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static bool fs_config_cmp(bool dir, const char* prefix, size_t len, const char* path, size_t plen) {
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std::string pattern(prefix, len);
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std::string input(path, plen);
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// Massage pattern and input so that they can be used by fnmatch where
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// directories have to end with /.
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if (dir) {
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if (!EndsWith(input, "/")) {
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input.append("/");
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}
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if (!EndsWith(pattern, "/*")) {
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if (EndsWith(pattern, "/")) {
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pattern.append("*");
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} else {
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pattern.append("/*");
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}
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}
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}
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// no FNM_PATHNAME is set in order to match a/b/c/d with a/*
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// FNM_ESCAPE is set in order to prevent using \\? and \\* and maintenance issues.
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const int fnm_flags = FNM_NOESCAPE;
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if (fnmatch(pattern.c_str(), input.c_str(), fnm_flags) == 0) return true;
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// Check match between logical partition's files and patterns.
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static constexpr const char* kLogicalPartitions[] = {"system/product/", "system/system_ext/",
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"system/vendor/", "vendor/odm/"};
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for (auto& logical_partition : kLogicalPartitions) {
|
|
if (StartsWith(input, logical_partition)) {
|
|
std::string input_in_partition = input.substr(input.find('/') + 1);
|
|
if (!is_partition(input_in_partition)) continue;
|
|
if (fnmatch(pattern.c_str(), input_in_partition.c_str(), fnm_flags) == 0) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
#ifndef __ANDROID_VNDK__
|
|
auto __for_testing_only__fs_config_cmp = fs_config_cmp;
|
|
#endif
|
|
|
|
bool get_fs_config(const char* path, bool dir, const char* target_out_path,
|
|
struct fs_config* fs_conf) {
|
|
const struct fs_path_config* pc;
|
|
size_t which, plen;
|
|
|
|
if (path[0] == '/') {
|
|
path++;
|
|
}
|
|
|
|
plen = strlen(path);
|
|
|
|
for (which = 0; which < (sizeof(conf) / sizeof(conf[0])); ++which) {
|
|
struct fs_path_config_from_file header;
|
|
|
|
int fd = fs_config_open(dir, which, target_out_path);
|
|
if (fd < 0) continue;
|
|
|
|
while (TEMP_FAILURE_RETRY(read(fd, &header, sizeof(header))) == sizeof(header)) {
|
|
char* prefix;
|
|
uint16_t host_len = header.len;
|
|
ssize_t len, remainder = host_len - sizeof(header);
|
|
if (remainder <= 0) {
|
|
ALOGE("%s len is corrupted", conf[which][dir]);
|
|
break;
|
|
}
|
|
prefix = static_cast<char*>(calloc(1, remainder));
|
|
if (!prefix) {
|
|
ALOGE("%s out of memory", conf[which][dir]);
|
|
break;
|
|
}
|
|
if (TEMP_FAILURE_RETRY(read(fd, prefix, remainder)) != remainder) {
|
|
free(prefix);
|
|
ALOGE("%s prefix is truncated", conf[which][dir]);
|
|
break;
|
|
}
|
|
len = strnlen(prefix, remainder);
|
|
if (len >= remainder) { // missing a terminating null
|
|
free(prefix);
|
|
ALOGE("%s is corrupted", conf[which][dir]);
|
|
break;
|
|
}
|
|
if (fs_config_cmp(dir, prefix, len, path, plen)) {
|
|
free(prefix);
|
|
close(fd);
|
|
fs_conf->uid = header.uid;
|
|
fs_conf->gid = header.gid;
|
|
fs_conf->mode = header.mode;
|
|
fs_conf->capabilities = header.capabilities;
|
|
return true;
|
|
}
|
|
free(prefix);
|
|
}
|
|
close(fd);
|
|
}
|
|
|
|
for (pc = dir ? android_dirs : android_files; pc->prefix; pc++) {
|
|
if (fs_config_cmp(dir, pc->prefix, strlen(pc->prefix), path, plen)) {
|
|
fs_conf->uid = pc->uid;
|
|
fs_conf->gid = pc->gid;
|
|
fs_conf->mode = pc->mode;
|
|
fs_conf->capabilities = pc->capabilities;
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void fs_config(const char* path, int dir, const char* target_out_path, unsigned* uid, unsigned* gid,
|
|
unsigned* mode, uint64_t* capabilities) {
|
|
struct fs_config conf;
|
|
if (get_fs_config(path, dir, target_out_path, &conf)) {
|
|
*uid = conf.uid;
|
|
*gid = conf.gid;
|
|
*mode = (*mode & S_IFMT) | conf.mode;
|
|
*capabilities = conf.capabilities;
|
|
} else {
|
|
*uid = AID_ROOT;
|
|
*gid = AID_ROOT;
|
|
*mode = (*mode & S_IFMT) | (dir ? 0755 : 0644);
|
|
*capabilities = 0;
|
|
}
|
|
}
|