Merge "Don't call the Package Manager when holding the settings lock" into oc-dev (781fdfaf) · Commits · e / os / android_frameworks_base

packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java

+34 −22

Original line number	Diff line number	Diff line
		@@ -994,6 +994,15 @@ public class SettingsProvider extends ContentProvider {
		return false;
		}

		private PackageInfo getCallingPackageInfo(int userId) {
		try {
		return mPackageManager.getPackageInfo(getCallingPackage(),
		PackageManager.GET_SIGNATURES, userId);
		} catch (RemoteException e) {
		throw new IllegalStateException("Package " + getCallingPackage() + " doesn't exist");
		}
		}

		private Cursor getAllSecureSettings(int userId, String[] projection) {
		if (DEBUG) {
		Slog.v(LOG_TAG, "getAllSecureSettings(" + userId + ")");
		@@ -1002,6 +1011,13 @@ public class SettingsProvider extends ContentProvider {
		// Resolve the userId on whose behalf the call is made.
		final int callingUserId = resolveCallingUserIdEnforcingPermissionsLocked(userId);

		// The relevant "calling package" userId will be the owning userId for some
		// profiles, and we can't do the lookup inside our [lock held] loop, so work out
		// up front who the effective "new SSAID" user ID for that settings name will be.
		final int ssaidUserId = resolveOwningUserIdForSecureSettingLocked(callingUserId,
		Settings.Secure.ANDROID_ID);
		final PackageInfo ssaidCallingPkg = getCallingPackageInfo(ssaidUserId);

		synchronized (mLock) {
		List<String> names = getSettingsNamesLocked(SETTINGS_TYPE_SECURE, callingUserId);

		@@ -1026,7 +1042,7 @@ public class SettingsProvider extends ContentProvider {
		// SETTINGS_FILE_SSAID, unless accessed by a system process.
		final Setting setting;
		if (isNewSsaidSetting(name)) {
		setting = getSsaidSettingLocked(owningUserId);
		setting = getSsaidSettingLocked(ssaidCallingPkg, owningUserId);
		} else {
		setting = mSettingsRegistry.getSettingLocked(SETTINGS_TYPE_SECURE, owningUserId,
		name);
		@@ -1060,14 +1076,17 @@ public class SettingsProvider extends ContentProvider {
		return settings != null ? settings.getNullSetting() : null;
		}

		// Get the value.
		synchronized (mLock) {
		// As of Android O, the SSAID is read from an app-specific entry in table
		// SETTINGS_FILE_SSAID, unless accessed by a system process.
		if (isNewSsaidSetting(name)) {
		return getSsaidSettingLocked(owningUserId);
		PackageInfo callingPkg = getCallingPackageInfo(owningUserId);
		synchronized (mLock) {
		return getSsaidSettingLocked(callingPkg, owningUserId);
		}
		}

		// Not the SSAID; do a straight lookup
		synchronized (mLock) {
		return mSettingsRegistry.getSettingLocked(SETTINGS_TYPE_SECURE,
		owningUserId, name);
		}
		@@ -1078,7 +1097,7 @@ public class SettingsProvider extends ContentProvider {
		&& UserHandle.getAppId(Binder.getCallingUid()) >= Process.FIRST_APPLICATION_UID;
		}

		private Setting getSsaidSettingLocked(int owningUserId) {
		private Setting getSsaidSettingLocked(PackageInfo callingPkg, int owningUserId) {
		// Get uid of caller (key) used to store ssaid value
		String name = Integer.toString(
		UserHandle.getUid(owningUserId, UserHandle.getAppId(Binder.getCallingUid())));
		@@ -1093,7 +1112,7 @@ public class SettingsProvider extends ContentProvider {

		// Lazy initialize ssaid if not yet present in ssaid table.
		if (ssaid == null \|\| ssaid.isNull() \|\| ssaid.getValue() == null) {
		return mSettingsRegistry.generateSsaidLocked(getCallingPackage(), owningUserId);
		return mSettingsRegistry.generateSsaidLocked(callingPkg, owningUserId);
		}

		return ssaid;
		@@ -2070,15 +2089,7 @@ public class SettingsProvider extends ContentProvider {
		return ByteBuffer.allocate(4).putInt(data.length).array();
		}

		public Setting generateSsaidLocked(String packageName, int userId) {
		final PackageInfo packageInfo;
		try {
		packageInfo = mPackageManager.getPackageInfo(packageName,
		PackageManager.GET_SIGNATURES, userId);
		} catch (RemoteException e) {
		throw new IllegalStateException("Package info doesn't exist");
		}

		public Setting generateSsaidLocked(PackageInfo callingPkg, int userId) {
		// Read the user's key from the ssaid table.
		Setting userKeySetting = getSettingLocked(SETTINGS_TYPE_SSAID, userId, SSAID_USER_KEY);
		if (userKeySetting == null \|\| userKeySetting.isNull()
		@@ -2113,11 +2124,12 @@ public class SettingsProvider extends ContentProvider {
		}

		// Mac the package name and each of the signatures.
		byte[] packageNameBytes = packageInfo.packageName.getBytes(StandardCharsets.UTF_8);
		final String packageName = callingPkg.packageName;
		byte[] packageNameBytes = packageName.getBytes(StandardCharsets.UTF_8);
		m.update(getLengthPrefix(packageNameBytes), 0, 4);
		m.update(packageNameBytes);
		for (int i = 0; i < packageInfo.signatures.length; i++) {
		byte[] sig = packageInfo.signatures[i].toByteArray();
		for (int i = 0; i < callingPkg.signatures.length; i++) {
		byte[] sig = callingPkg.signatures[i].toByteArray();
		m.update(getLengthPrefix(sig), 0, 4);
		m.update(sig);
		}
		@@ -2127,7 +2139,7 @@ public class SettingsProvider extends ContentProvider {
		.toLowerCase(Locale.US);

		// Save the ssaid in the ssaid table.
		final String uid = Integer.toString(packageInfo.applicationInfo.uid);
		final String uid = Integer.toString(callingPkg.applicationInfo.uid);
		final SettingsState ssaidSettings = getSettingsLocked(SETTINGS_TYPE_SSAID, userId);
		final boolean success = ssaidSettings.insertSettingLocked(uid, ssaid, null, true,
		packageName);