Merge "libcutils: convert fs_config.cpp" (a255ab0c) · Commits · e / os / android_system_core

libcutils/Android.bp

+4 −1

Original line number	Diff line number	Diff line
		@@ -53,7 +53,7 @@ cc_library {
		host_supported: true,
		srcs: [
		"config_utils.c",
		"fs_config.c",
		"fs_config.cpp",
		"canned_fs_config.c",
		"hashmap.c",
		"iosched_policy.c",
		@@ -94,6 +94,9 @@ cc_library {
		shared: {
		enabled: false,
		},
		cflags: [
		"-D_GNU_SOURCE",
		],
		},

		android: {

libcutils/fs_config.c→libcutils/fs_config.cpp

+44 −49

Original line number	Diff line number	Diff line
		@@ -14,15 +14,12 @@
		* limitations under the License.
		*/

		/* This file is used to define the properties of the filesystem
		** images generated by build tools (mkbootfs and mkyaffs2image) and
		** by the device side of adb.
		*/
		// This file is used to define the properties of the filesystem
		// images generated by build tools (mkbootfs and mkyaffs2image) and
		// by the device side of adb.

		#define LOG_TAG "fs_config"

		#define _GNU_SOURCE

		#include <errno.h>
		#include <fcntl.h>
		#include <stdbool.h>
		@@ -42,8 +39,10 @@
		#define O_BINARY 0
		#endif

		/* My kingdom for <endian.h> */
		static inline uint16_t get2LE(const uint8_t* src) { return src[0] \| (src[1] << 8); }
		// My kingdom for <endian.h>
		static inline uint16_t get2LE(const uint8_t* src) {
		return src[0] \| (src[1] << 8);
		}

		static inline uint64_t get8LE(const uint8_t* src) {
		uint32_t low, high;
		@@ -55,14 +54,13 @@ static inline uint64_t get8LE(const uint8_t* src) {

		#define ALIGN(x, alignment) (((x) + ((alignment)-1)) & ~((alignment)-1))

		/* Rules for directories.
		** These rules are applied based on "first match", so they
		** should start with the most specific path and work their
		** way up to the root.
		*/
		// Rules for directories.
		// These rules are applied based on "first match", so they
		// should start with the most specific path and work their
		// way up to the root.

		static const struct fs_path_config android_dirs[] = {
		/* clang-format off */
		// clang-format off
		{ 00770, AID_SYSTEM, AID_CACHE, 0, "cache" },
		{ 00500, AID_ROOT, AID_ROOT, 0, "config" },
		{ 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/app" },
		@@ -92,25 +90,23 @@ static const struct fs_path_config android_dirs[] = {
		{ 00755, AID_ROOT, AID_SHELL, 0, "system/xbin" },
		{ 00755, AID_ROOT, AID_SHELL, 0, "vendor" },
		{ 00755, AID_ROOT, AID_ROOT, 0, 0 },
		/* clang-format on */
		// clang-format on
		};

		/* Rules for files.
		** These rules are applied based on "first match", so they
		** should start with the most specific path and work their
		** way up to the root. Prefixes ending in * denotes wildcard
		** and will allow partial matches.
		*/
		// Rules for files.
		// These rules are applied based on "first match", so they
		// should start with the most specific path and work their
		// way up to the root. Prefixes ending in * denotes wildcard
		// and will allow partial matches.
		static const char sys_conf_dir[] = "/system/etc/fs_config_dirs";
		static const char sys_conf_file[] = "/system/etc/fs_config_files";
		/* No restrictions are placed on the vendor and oem file-system config files,
		* although the developer is advised to restrict the scope to the /vendor or
		* oem/ file-system since the intent is to provide support for customized
		* portions of a separate vendor.img or oem.img. Has to remain open so that
		* customization can also land on /system/vendor, /system/oem or /system/odm.
		* We expect build-time checking or filtering when constructing the associated
		* fs_config_* files (see build/tools/fs_config/fs_config_generate.c)
		*/
		// No restrictions are placed on the vendor and oem file-system config files,
		// although the developer is advised to restrict the scope to the /vendor or
		// oem/ file-system since the intent is to provide support for customized
		// portions of a separate vendor.img or oem.img. Has to remain open so that
		// customization can also land on /system/vendor, /system/oem or /system/odm.
		// We expect build-time checking or filtering when constructing the associated
		// fs_config_* files (see build/tools/fs_config/fs_config_generate.c)
		static const char ven_conf_dir[] = "/vendor/etc/fs_config_dirs";
		static const char ven_conf_file[] = "/vendor/etc/fs_config_files";
		static const char oem_conf_dir[] = "/oem/etc/fs_config_dirs";
		@@ -125,7 +121,7 @@ static const char* conf[][2] = {
		};

		static const struct fs_path_config android_files[] = {
		/* clang-format off */
		// clang-format off
		{ 00644, AID_SYSTEM, AID_SYSTEM, 0, "data/app/*" },
		{ 00644, AID_SYSTEM, AID_SYSTEM, 0, "data/app-ephemeral/*" },
		{ 00644, AID_SYSTEM, AID_SYSTEM, 0, "data/app-private/*" },
		@@ -173,13 +169,13 @@ static const struct fs_path_config android_files[] = {
		{ 00444, AID_ROOT, AID_ROOT, 0, ven_conf_dir + 1 },
		{ 00444, AID_ROOT, AID_ROOT, 0, ven_conf_file + 1 },

		/* the following two files are INTENTIONALLY set-uid, but they
		* are NOT included on user builds. */
		// the following two files are INTENTIONALLY set-uid, but they
		// are NOT included on user builds.
		{ 06755, AID_ROOT, AID_ROOT, 0, "system/xbin/procmem" },
		{ 04750, AID_ROOT, AID_SHELL, 0, "system/xbin/su" },

		/* the following files have enhanced capabilities and ARE included
		* in user builds. */
		// the following files have enhanced capabilities and ARE included
		// in user builds.
		{ 00700, AID_SYSTEM, AID_SHELL, CAP_MASK_LONG(CAP_BLOCK_SUSPEND),
		"system/bin/inputflinger" },
		{ 00550, AID_LOGD, AID_LOGD, CAP_MASK_LONG(CAP_SYSLOG) \|
		@@ -190,17 +186,17 @@ static const struct fs_path_config android_files[] = {
		CAP_MASK_LONG(CAP_SETGID),
		"system/bin/run-as" },

		/* Support FIFO scheduling mode in SurfaceFlinger. */
		// Support FIFO scheduling mode in SurfaceFlinger.
		{ 00755, AID_SYSTEM, AID_GRAPHICS, CAP_MASK_LONG(CAP_SYS_NICE),
		"system/bin/surfaceflinger" },

		/* Support hostapd administering a network interface. */
		// Support hostapd administering a network interface.
		{ 00755, AID_WIFI, AID_WIFI, CAP_MASK_LONG(CAP_NET_ADMIN) \|
		CAP_MASK_LONG(CAP_NET_RAW),
		"system/bin/hostapd" },

		/* Support Bluetooth legacy hal accessing /sys/class/rfkill
		* Support RT scheduling in Bluetooth */
		// Support Bluetooth legacy hal accessing /sys/class/rfkill
		// Support RT scheduling in Bluetooth
		{ 00700, AID_BLUETOOTH, AID_BLUETOOTH, CAP_MASK_LONG(CAP_NET_ADMIN) \|
		CAP_MASK_LONG(CAP_SYS_NICE),
		"system/vendor/bin/hw/android.hardware.bluetooth@1.0-service" },
		@@ -208,7 +204,7 @@ static const struct fs_path_config android_files[] = {
		CAP_MASK_LONG(CAP_SYS_NICE),
		"vendor/bin/hw/android.hardware.bluetooth@1.0-service" },

		/* Support wifi_hal_legacy administering a network interface. */
		// Support wifi_hal_legacy administering a network interface.
		{ 00755, AID_WIFI, AID_WIFI, CAP_MASK_LONG(CAP_NET_ADMIN) \|
		CAP_MASK_LONG(CAP_NET_RAW),
		"system/vendor/bin/hw/android.hardware.wifi@1.0-service" },
		@@ -216,8 +212,7 @@ static const struct fs_path_config android_files[] = {
		CAP_MASK_LONG(CAP_NET_RAW),
		"vendor/bin/hw/android.hardware.wifi@1.0-service" },

		/* A non-privileged zygote that spawns
		* isolated processes for web rendering. */
		// A non-privileged zygote that spawns isolated processes for web rendering.
		{ 0750, AID_ROOT, AID_ROOT, CAP_MASK_LONG(CAP_SETUID) \|
		CAP_MASK_LONG(CAP_SETGID) \|
		CAP_MASK_LONG(CAP_SETPCAP),
		@@ -227,7 +222,7 @@ static const struct fs_path_config android_files[] = {
		CAP_MASK_LONG(CAP_SETPCAP),
		"system/bin/webview_zygote64" },

		/* generic defaults */
		// generic defaults
		{ 00755, AID_ROOT, AID_ROOT, 0, "bin/*" },
		{ 00640, AID_ROOT, AID_SHELL, 0, "fstab.*" },
		{ 00750, AID_ROOT, AID_SHELL, 0, "init*" },
		@@ -241,7 +236,7 @@ static const struct fs_path_config android_files[] = {
		{ 00755, AID_ROOT, AID_SHELL, 0, "vendor/bin/*" },
		{ 00755, AID_ROOT, AID_SHELL, 0, "vendor/xbin/*" },
		{ 00644, AID_ROOT, AID_ROOT, 0, 0 },
		/* clang-format on */
		// clang-format on
		};

		static size_t strip(const char* path, size_t len, const char suffix[]) {
		@@ -254,9 +249,9 @@ static int fs_config_open(int dir, int which, const char* target_out_path) {
		int fd = -1;

		if (target_out_path && *target_out_path) {
		/* target_out_path is the path to the directory holding content of
		* system partition but as we cannot guarantee it ends with '/system'
		* or with or without a trailing slash, need to strip them carefully. */
		// target_out_path is the path to the directory holding content of
		// system partition but as we cannot guarantee it ends with '/system'
		// or with or without a trailing slash, need to strip them carefully.
		char* name = NULL;
		size_t len = strlen(target_out_path);
		len = strip(target_out_path, len, "/");
		@@ -278,7 +273,7 @@ static bool fs_config_cmp(bool dir, const char* prefix, size_t len, const char*
		return false;
		}
		} else {
		/* If name ends in * then allow partial matches. */
		// If name ends in * then allow partial matches.
		if (prefix[len - 1] == '*') {
		return !strncmp(prefix, path, len - 1);
		}
		@@ -314,7 +309,7 @@ void fs_config(const char* path, int dir, const char* target_out_path, unsigned*
		ALOGE("%s len is corrupted", conf[which][dir]);
		break;
		}
		prefix = calloc(1, remainder);
		prefix = static_cast<char*>(calloc(1, remainder));
		if (!prefix) {
		ALOGE("%s out of memory", conf[which][dir]);
		break;
		@@ -325,7 +320,7 @@ void fs_config(const char* path, int dir, const char* target_out_path, unsigned*
		break;
		}
		len = strnlen(prefix, remainder);
		if (len >= remainder) { /* missing a terminating null */
		if (len >= remainder) { // missing a terminating null
		free(prefix);
		ALOGE("%s is corrupted", conf[which][dir]);
		break;