Add revoke storage permission on package update (14bea27d) · Commits · e / os / android_frameworks_base

services/permission/java/com/android/server/permission/access/permission/UidPermissionPolicy.kt

+52 −3

Original line number	Diff line number	Diff line
		@@ -146,6 +146,7 @@ class UidPermissionPolicy : SchemePolicy() {
		addPermissions(packageState, changedPermissionNames)
		trimPermissions(packageState.packageName, changedPermissionNames)
		trimPermissionStates(packageState.appId)
		revokePermissionsOnPackageUpdate(packageState.appId)
		}
		changedPermissionNames.forEachIndexed { _, permissionName ->
		evaluatePermissionStateForAllPackages(permissionName, null)
		@@ -175,10 +176,10 @@ class UidPermissionPolicy : SchemePolicy() {
		adoptPermissions(packageState, changedPermissionNames)
		addPermissionGroups(packageState)
		addPermissions(packageState, changedPermissionNames)
		// TODO: revokeStoragePermissionsIfScopeExpandedInternal()
		// TODO: revokeSystemAlertWindowIfUpgradedPast23()
		trimPermissions(packageState.packageName, changedPermissionNames)
		trimPermissionStates(packageState.appId)
		revokePermissionsOnPackageUpdate(packageState.appId)
		changedPermissionNames.forEachIndexed { _, permissionName ->
		evaluatePermissionStateForAllPackages(permissionName, null)
		}
		@@ -602,6 +603,40 @@ class UidPermissionPolicy : SchemePolicy() {
		}
		}

		private fun MutateStateScope.revokePermissionsOnPackageUpdate(appId: Int) {
		// If the app is updated, and has scoped storage permissions, then it is possible that the
		// app updated in an attempt to get unscoped storage. If so, revoke all storage permissions.
		newState.userStates.forEachIndexed { _, userId, userState ->
		userState.uidPermissionFlags[appId]?.forEachReversedIndexed {
		_, permissionName, oldFlags ->
		if (permissionName !in STORAGE_AND_MEDIA_PERMISSIONS \|\| oldFlags == 0) {
		return@forEachReversedIndexed
		}
		val oldTargetSdkVersion = getAppIdTargetSdkVersion(appId, permissionName, oldState)
		val newTargetSdkVersion = getAppIdTargetSdkVersion(appId, permissionName, newState)
		val isTargetSdkVersionDowngraded = oldTargetSdkVersion >= Build.VERSION_CODES.Q &&
		newTargetSdkVersion < Build.VERSION_CODES.Q
		val isTargetSdkVersionUpgraded = oldTargetSdkVersion < Build.VERSION_CODES.Q &&
		newTargetSdkVersion >= Build.VERSION_CODES.Q
		val oldIsRequestLegacyExternalStorage = anyPackageInAppId(appId, oldState) {
		it.androidPackage!!.isRequestLegacyExternalStorage
		}
		val newIsRequestLegacyExternalStorage = anyPackageInAppId(appId, newState) {
		it.androidPackage!!.isRequestLegacyExternalStorage
		}
		val isNewlyRequestingLegacyExternalStorage = !isTargetSdkVersionUpgraded &&
		!oldIsRequestLegacyExternalStorage && newIsRequestLegacyExternalStorage
		if ((isNewlyRequestingLegacyExternalStorage \|\| isTargetSdkVersionDowngraded) &&
		oldFlags.hasBits(PermissionFlags.RUNTIME_GRANTED)) {
		val newFlags = oldFlags andInv (
		PermissionFlags.RUNTIME_GRANTED or USER_SETTABLE_MASK
		)
		setPermissionFlags(appId, userId, permissionName, newFlags)
		}
		}
		}
		}

		private fun MutateStateScope.evaluatePermissionStateForAllPackages(
		permissionName: String,
		installedPackageState: PackageState?
		@@ -1002,9 +1037,13 @@ class UidPermissionPolicy : SchemePolicy() {
		}
		}

		private fun MutateStateScope.getAppIdTargetSdkVersion(appId: Int, permissionName: String): Int {
		private fun MutateStateScope.getAppIdTargetSdkVersion(
		appId: Int,
		permissionName: String,
		state: AccessState = newState
		): Int {
		var targetSdkVersion = Build.VERSION_CODES.CUR_DEVELOPMENT
		forEachPackageInAppId(appId) { packageState ->
		forEachPackageInAppId(appId, state) { packageState ->
		val androidPackage = packageState.androidPackage!!
		if (permissionName in androidPackage.requestedPermissions) {
		targetSdkVersion = targetSdkVersion.coerceAtMost(androidPackage.targetSdkVersion)
		@@ -1356,6 +1395,16 @@ class UidPermissionPolicy : SchemePolicy() {
		Manifest.permission.POST_NOTIFICATIONS
		)

		private val STORAGE_AND_MEDIA_PERMISSIONS = indexedSetOf(
		Manifest.permission.READ_EXTERNAL_STORAGE,
		Manifest.permission.WRITE_EXTERNAL_STORAGE,
		Manifest.permission.READ_MEDIA_AUDIO,
		Manifest.permission.READ_MEDIA_VIDEO,
		Manifest.permission.READ_MEDIA_IMAGES,
		Manifest.permission.ACCESS_MEDIA_LOCATION,
		Manifest.permission.READ_MEDIA_VISUAL_USER_SELECTED
		)

		/**
		* Mask for all permission flags that can be set by the user
		*/