Merge "Checks that state requested from top app is a state we allow" into... (37086b82) · Commits · e / os / android_frameworks_base

core/res/res/values/config.xml

+3 −0

Original line number	Diff line number	Diff line
		@@ -5781,4 +5781,7 @@
		<string name="safety_protection_display_text"></string>

		<!-- End safety protection resources to be overlaid -->

		<!-- List of the labels of requestable device state config values -->
		<string-array name="config_deviceStatesAvailableForAppRequests"/>
		</resources>

core/res/res/values/symbols.xml

+1 −0

Original line number	Diff line number	Diff line
		@@ -4775,6 +4775,7 @@
		<java-symbol type="bool" name="config_bg_current_drain_high_threshold_by_bg_location" />
		<java-symbol type="drawable" name="ic_swap_horiz" />
		<java-symbol type="bool" name="config_notificationForceUserSetOnUpgrade" />
		<java-symbol type="array" name="config_deviceStatesAvailableForAppRequests" />

		<!-- For app language picker -->
		<java-symbol type="string" name="system_locale_title" />

services/core/java/com/android/server/devicestate/DeviceStateManagerService.java

+74 −8

Original line number	Diff line number	Diff line
		@@ -43,6 +43,7 @@ import android.os.ShellCallback;
		import android.util.Slog;
		import android.util.SparseArray;

		import com.android.internal.R;
		import com.android.internal.annotations.GuardedBy;
		import com.android.internal.annotations.VisibleForTesting;
		import com.android.internal.util.DumpUtils;
		@@ -59,7 +60,9 @@ import java.lang.annotation.Retention;
		import java.lang.annotation.RetentionPolicy;
		import java.util.ArrayList;
		import java.util.Arrays;
		import java.util.HashSet;
		import java.util.Optional;
		import java.util.Set;
		import java.util.WeakHashMap;

		/**
		@@ -139,6 +142,8 @@ public final class DeviceStateManagerService extends SystemService {
		@GuardedBy("mLock")
		private final SparseArray<ProcessRecord> mProcessRecords = new SparseArray<>();

		private Set<Integer> mDeviceStatesAvailableForAppRequests;

		public DeviceStateManagerService(@NonNull Context context) {
		this(context, DeviceStatePolicy.Provider
		.fromResources(context.getResources())
		@@ -164,6 +169,10 @@ public final class DeviceStateManagerService extends SystemService {
		public void onStart() {
		publishBinderService(Context.DEVICE_STATE_SERVICE, mBinderService);
		publishLocalService(DeviceStateManagerInternal.class, new LocalService());

		synchronized (mLock) {
		readStatesAvailableForRequestFromApps();
		}
		}

		@VisibleForTesting
		@@ -626,21 +635,78 @@ public final class DeviceStateManagerService extends SystemService {

		/**
		* Allow top processes to request or cancel a device state change. If the calling process ID is
		* not the top app, then check if this process holds the
		* {@link android.Manifest.permission.CONTROL_DEVICE_STATE} permission. If the calling process
		* is the top app, check to verify they are requesting a state we've deemed to be able to be
		* available for an app process to request. States that can be requested are based around
		* features that we've created that require specific device state overrides.
		* @param callingPid Process ID that is requesting this state change
		* @param state state that is being requested.
		*/
		private void assertCanRequestDeviceState(int callingPid, int state) {
		final WindowProcessController topApp = mActivityTaskManagerInternal.getTopApp();
		if (topApp == null \|\| topApp.getPid() != callingPid
		\|\| !isStateAvailableForAppRequests(state)) {
		getContext().enforceCallingOrSelfPermission(CONTROL_DEVICE_STATE,
		"Permission required to request device state, "
		+ "or the call must come from the top app "
		+ "and be a device state that is available for apps to request.");
		}
		}

		/**
		* Checks if the process can control the device state. If the calling process ID is
		* not the top app, then check if this process holds the CONTROL_DEVICE_STATE permission.
		* @param callingPid
		*
		* @param callingPid Process ID that is requesting this state change
		*/
		private void checkCanControlDeviceState(int callingPid) {
		// Allow top processes to request a device state change
		// If the calling process ID is not the top app, then we check if this process
		// holds a permission to CONTROL_DEVICE_STATE
		private void assertCanControlDeviceState(int callingPid) {
		final WindowProcessController topApp = mActivityTaskManagerInternal.getTopApp();
		if (topApp == null \|\| topApp.getPid() != callingPid) {
		getContext().enforceCallingOrSelfPermission(CONTROL_DEVICE_STATE,
		"Permission required to request device state, "
		+ "or the call must come from the top focused app.");
		+ "or the call must come from the top app.");
		}
		}

		private boolean isStateAvailableForAppRequests(int state) {
		synchronized (mLock) {
		return mDeviceStatesAvailableForAppRequests.contains(state);
		}
		}

		/**
		* Adds device state values that are available to be requested by the top level app.
		*/
		@GuardedBy("mLock")
		private void readStatesAvailableForRequestFromApps() {
		mDeviceStatesAvailableForAppRequests = new HashSet<>();
		String[] availableAppStatesConfigIdentifiers = getContext().getResources()
		.getStringArray(R.array.config_deviceStatesAvailableForAppRequests);
		for (int i = 0; i < availableAppStatesConfigIdentifiers.length; i++) {
		String identifierToFetch = availableAppStatesConfigIdentifiers[i];
		int configValueIdentifier = getContext().getResources()
		.getIdentifier(identifierToFetch, "integer", "android");
		int state = getContext().getResources().getInteger(configValueIdentifier);
		if (isValidState(state)) {
		mDeviceStatesAvailableForAppRequests.add(state);
		} else {
		Slog.e(TAG, "Invalid device state was found in the configuration file. State id: "
		+ state);
		}
		}
		}

		@GuardedBy("mLock")
		private boolean isValidState(int state) {
		for (int i = 0; i < mDeviceStates.size(); i++) {
		if (state == mDeviceStates.valueAt(i).getIdentifier()) {
		return true;
		}
		}
		return false;
		}

		private final class DeviceStateProviderListener implements DeviceStateProvider.Listener {
		@Override
		public void onSupportedDeviceStatesChanged(DeviceState[] newDeviceStates) {
		@@ -777,7 +843,7 @@ public final class DeviceStateManagerService extends SystemService {
		// Allow top processes to request a device state change
		// If the calling process ID is not the top app, then we check if this process
		// holds a permission to CONTROL_DEVICE_STATE
		checkCanControlDeviceState(callingPid);
		assertCanRequestDeviceState(callingPid, state);

		if (token == null) {
		throw new IllegalArgumentException("Request token must not be null.");
		@@ -797,7 +863,7 @@ public final class DeviceStateManagerService extends SystemService {
		// Allow top processes to cancel a device state change
		// If the calling process ID is not the top app, then we check if this process
		// holds a permission to CONTROL_DEVICE_STATE
		checkCanControlDeviceState(callingPid);
		assertCanControlDeviceState(callingPid);

		final long callingIdentity = Binder.clearCallingIdentity();
		try {