e08303d8cf
The Bluetooth HAL has threads that process Bluetooth audio. They need to be scheduled as RT priority, so allow the Bluetooth HAL to set its threads to RT scheduling. Bug 37518404 Test: play Bluetooth audio, confirm priority via systrace Change-Id: I4928cf182a0805c0714e4d073cba15c864fbe328
358 lines
16 KiB
C
358 lines
16 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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/* 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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*/
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#define LOG_TAG "fs_config"
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#define _GNU_SOURCE
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.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 <log/log.h>
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#include <private/android_filesystem_config.h>
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#include <private/fs_config.h>
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#include <utils/Compat.h>
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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/* My kingdom for <endian.h> */
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static inline uint16_t get2LE(const uint8_t* src) { return src[0] | (src[1] << 8); }
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static inline uint64_t get8LE(const uint8_t* src) {
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uint32_t low, high;
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low = src[0] | (src[1] << 8) | (src[2] << 16) | (src[3] << 24);
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high = src[4] | (src[5] << 8) | (src[6] << 16) | (src[7] << 24);
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return ((uint64_t)high << 32) | (uint64_t)low;
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}
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#define ALIGN(x, alignment) (((x) + ((alignment)-1)) & ~((alignment)-1))
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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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*/
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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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{ 00500, 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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{ 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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{ 00755, AID_ROOT, AID_ROOT, 0, "root" },
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{ 00750, AID_ROOT, AID_SHELL, 0, "sbin" },
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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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{ 00755, 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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{ 00755, AID_ROOT, AID_SHELL, 0, "system/xbin" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "vendor" },
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{ 00755, AID_ROOT, AID_ROOT, 0, 0 },
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/* clang-format on */
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};
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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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*/
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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 or /system/odm.
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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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*/
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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* conf[][2] = {
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{sys_conf_file, sys_conf_dir},
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{ven_conf_file, ven_conf_dir},
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{oem_conf_file, oem_conf_dir},
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{odm_conf_file, odm_conf_dir},
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};
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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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{ 00600, AID_ROOT, AID_ROOT, 0, "default.prop" },
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{ 00600, AID_ROOT, AID_ROOT, 0, "odm/build.prop" },
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{ 00600, AID_ROOT, AID_ROOT, 0, "odm/default.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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{ 00750, AID_ROOT, AID_SHELL, 0, "sbin/fs_mgr" },
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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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{ 00750, AID_ROOT, AID_ROOT, 0, "system/bin/install-recovery.sh" },
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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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{ 00440, AID_ROOT, AID_ROOT, 0, "system/etc/recovery.img" },
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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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{ 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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{ 00700, AID_SYSTEM, AID_SHELL, CAP_MASK_LONG(CAP_BLOCK_SUSPEND),
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"system/bin/inputflinger" },
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{ 00550, AID_LOGD, AID_LOGD, CAP_MASK_LONG(CAP_SYSLOG) |
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CAP_MASK_LONG(CAP_AUDIT_CONTROL) |
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CAP_MASK_LONG(CAP_SETGID),
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"system/bin/logd" },
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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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/* Support FIFO scheduling mode in SurfaceFlinger. */
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{ 00755, AID_SYSTEM, AID_GRAPHICS, CAP_MASK_LONG(CAP_SYS_NICE),
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"system/bin/surfaceflinger" },
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/* Support hostapd administering a network interface. */
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{ 00755, AID_WIFI, AID_WIFI, CAP_MASK_LONG(CAP_NET_ADMIN) |
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CAP_MASK_LONG(CAP_NET_RAW),
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"system/bin/hostapd" },
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/* Support Bluetooth legacy hal accessing /sys/class/rfkill
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* Support RT scheduling in Bluetooth */
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{ 00700, AID_BLUETOOTH, AID_BLUETOOTH, CAP_MASK_LONG(CAP_NET_ADMIN) |
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CAP_MASK_LONG(CAP_SYS_NICE),
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"vendor/bin/hw/android.hardware.bluetooth@1.0-service" },
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/* Support wifi_hal_legacy administering a network interface. */
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{ 00755, AID_WIFI, AID_WIFI, CAP_MASK_LONG(CAP_NET_ADMIN) |
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CAP_MASK_LONG(CAP_NET_RAW),
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"vendor/bin/hw/android.hardware.wifi@1.0-service" },
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/* A non-privileged zygote that spawns
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* isolated processes for web rendering. */
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{ 0750, AID_ROOT, AID_ROOT, CAP_MASK_LONG(CAP_SETUID) |
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CAP_MASK_LONG(CAP_SETGID) |
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CAP_MASK_LONG(CAP_SETPCAP),
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"system/bin/webview_zygote32" },
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{ 0750, AID_ROOT, AID_ROOT, CAP_MASK_LONG(CAP_SETUID) |
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CAP_MASK_LONG(CAP_SETGID) |
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CAP_MASK_LONG(CAP_SETPCAP),
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"system/bin/webview_zygote64" },
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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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{ 00750, AID_ROOT, AID_SHELL, 0, "sbin/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "system/bin/*" },
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{ 00755, AID_ROOT, AID_ROOT, 0, "system/lib/valgrind/*" },
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{ 00755, AID_ROOT, AID_ROOT, 0, "system/lib64/valgrind/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "system/vendor/bin/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "system/vendor/xbin/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "system/xbin/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "vendor/bin/*" },
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{ 00755, AID_ROOT, AID_SHELL, 0, "vendor/xbin/*" },
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{ 00644, AID_ROOT, AID_ROOT, 0, 0 },
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/* clang-format on */
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};
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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 | O_BINARY));
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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 | O_BINARY));
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}
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return fd;
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}
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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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if (dir) {
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if (plen < len) {
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return false;
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}
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} else {
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/* If name ends in * then allow partial matches. */
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if (prefix[len - 1] == '*') {
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return !strncmp(prefix, path, len - 1);
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}
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if (plen != len) {
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return false;
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}
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}
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return !strncmp(prefix, path, len);
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}
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void fs_config(const char* path, int dir, const char* target_out_path, unsigned* uid, unsigned* gid,
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unsigned* mode, uint64_t* capabilities) {
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const struct fs_path_config* pc;
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size_t which, plen;
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if (path[0] == '/') {
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path++;
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}
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plen = strlen(path);
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for (which = 0; which < (sizeof(conf) / sizeof(conf[0])); ++which) {
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struct fs_path_config_from_file header;
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int fd = fs_config_open(dir, which, target_out_path);
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if (fd < 0) continue;
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while (TEMP_FAILURE_RETRY(read(fd, &header, sizeof(header))) == sizeof(header)) {
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char* prefix;
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uint16_t host_len = get2LE((const uint8_t*)&header.len);
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ssize_t len, remainder = host_len - sizeof(header);
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if (remainder <= 0) {
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ALOGE("%s len is corrupted", conf[which][dir]);
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break;
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}
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prefix = calloc(1, remainder);
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if (!prefix) {
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ALOGE("%s out of memory", conf[which][dir]);
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break;
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}
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if (TEMP_FAILURE_RETRY(read(fd, prefix, remainder)) != remainder) {
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free(prefix);
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ALOGE("%s prefix is truncated", conf[which][dir]);
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break;
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}
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len = strnlen(prefix, remainder);
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if (len >= remainder) { /* missing a terminating null */
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free(prefix);
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ALOGE("%s is corrupted", conf[which][dir]);
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break;
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}
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if (fs_config_cmp(dir, prefix, len, path, plen)) {
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free(prefix);
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close(fd);
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*uid = get2LE((const uint8_t*)&(header.uid));
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*gid = get2LE((const uint8_t*)&(header.gid));
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*mode = (*mode & (~07777)) | get2LE((const uint8_t*)&(header.mode));
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*capabilities = get8LE((const uint8_t*)&(header.capabilities));
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return;
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}
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free(prefix);
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}
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close(fd);
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}
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for (pc = dir ? android_dirs : android_files; pc->prefix; pc++) {
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if (fs_config_cmp(dir, pc->prefix, strlen(pc->prefix), path, plen)) {
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break;
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}
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}
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*uid = pc->uid;
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*gid = pc->gid;
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*mode = (*mode & (~07777)) | pc->mode;
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*capabilities = pc->capabilities;
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}
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ssize_t fs_config_generate(char* buffer, size_t length, const struct fs_path_config* pc) {
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struct fs_path_config_from_file* p = (struct fs_path_config_from_file*)buffer;
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size_t len = ALIGN(sizeof(*p) + strlen(pc->prefix) + 1, sizeof(uint64_t));
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if ((length < len) || (len > UINT16_MAX)) {
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return -ENOSPC;
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}
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memset(p, 0, len);
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uint16_t host_len = len;
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p->len = get2LE((const uint8_t*)&host_len);
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p->mode = get2LE((const uint8_t*)&(pc->mode));
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p->uid = get2LE((const uint8_t*)&(pc->uid));
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p->gid = get2LE((const uint8_t*)&(pc->gid));
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p->capabilities = get8LE((const uint8_t*)&(pc->capabilities));
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strcpy(p->prefix, pc->prefix);
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return len;
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}
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