Ensure permissions are revoked on state changes am: 84c1247a7e (eeae60d8) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/pm/PackageManagerService.java

+20 −4

Original line number	Diff line number	Diff line
		@@ -329,6 +329,7 @@ import com.android.internal.os.SomeArgs;
		import com.android.internal.os.Zygote;
		import com.android.internal.telephony.CarrierAppUtils;
		import com.android.internal.util.ArrayUtils;
		import com.android.internal.util.CollectionUtils;
		import com.android.internal.util.ConcurrentUtils;
		import com.android.internal.util.DumpUtils;
		import com.android.internal.util.FastXmlSerializer;
		@@ -12428,11 +12429,16 @@ public class PackageManagerService extends IPackageManager.Stub
		mPermissionManager.addAllPermissionGroups(pkg, chatty);
		}

		// If a permission has had its defining app changed, or it has had its protection
		// upgraded, we need to revoke apps that hold it
		final List<String> permissionsWithChangedDefinition;
		// Don't allow ephemeral applications to define new permissions.
		if ((scanFlags & SCAN_AS_INSTANT_APP) != 0) {
		permissionsWithChangedDefinition = null;
		Slog.w(TAG, "Permissions from package " + pkg.getPackageName()
		+ " ignored: instant apps cannot define new permissions.");
		} else {
		permissionsWithChangedDefinition =
		mPermissionManager.addAllPermissions(pkg, chatty);
		}

		@@ -12462,7 +12468,10 @@ public class PackageManagerService extends IPackageManager.Stub
		}
		}

		if (oldPkg != null) {
		boolean hasOldPkg = oldPkg != null;
		boolean hasPermissionDefinitionChanges =
		!CollectionUtils.isEmpty(permissionsWithChangedDefinition);
		if (hasOldPkg \|\| hasPermissionDefinitionChanges) {
		// We need to call revokeRuntimePermissionsIfGroupChanged async as permission
		// revoke callbacks from this method might need to kill apps which need the
		// mPackages lock on a different thread. This would dead lock.
		@@ -12473,9 +12482,16 @@ public class PackageManagerService extends IPackageManager.Stub
		// won't be granted yet, hence new packages are no problem.
		final ArrayList<String> allPackageNames = new ArrayList<>(mPackages.keySet());

		AsyncTask.execute(() ->
		AsyncTask.execute(() -> {
		if (hasOldPkg) {
		mPermissionManager.revokeRuntimePermissionsIfGroupChanged(pkg, oldPkg,
		allPackageNames));
		allPackageNames);
		}
		if (hasPermissionDefinitionChanges) {
		mPermissionManager.revokeRuntimePermissionsIfPermissionDefinitionChanged(
		permissionsWithChangedDefinition, allPackageNames);
		}
		});
		}
		}

services/core/java/com/android/server/pm/permission/BasePermission.java

+19 −0

Original line number	Diff line number	Diff line
		@@ -83,6 +83,8 @@ public final class BasePermission {

		final @PermissionType int type;

		private boolean mPermissionDefinitionChanged;

		String sourcePackageName;

		int protectionLevel;
		@@ -126,6 +128,11 @@ public final class BasePermission {
		public String getSourcePackageName() {
		return sourcePackageName;
		}

		public boolean isPermissionDefinitionChanged() {
		return mPermissionDefinitionChanged;
		}

		public int getType() {
		return type;
		}
		@@ -140,6 +147,10 @@ public final class BasePermission {
		this.perm = perm;
		}

		public void setPermissionDefinitionChanged(boolean shouldOverride) {
		mPermissionDefinitionChanged = shouldOverride;
		}

		public int[] computeGids(int userId) {
		if (perUser) {
		final int[] userGids = new int[gids.length];
		@@ -322,6 +333,7 @@ public final class BasePermission {
		final PackageSettingBase pkgSetting =
		(PackageSettingBase) packageManagerInternal.getPackageSetting(pkg.getPackageName());
		// Allow system apps to redefine non-system permissions
		boolean ownerChanged = false;
		if (bp != null && !Objects.equals(bp.sourcePackageName, p.getPackageName())) {
		final boolean currentOwnerIsSystem;
		if (bp.perm == null) {
		@@ -347,6 +359,7 @@ public final class BasePermission {
		String msg = "New decl " + pkg + " of permission "
		+ p.getName() + " is system; overriding " + bp.sourcePackageName;
		PackageManagerService.reportSettingsProblem(Log.WARN, msg);
		ownerChanged = true;
		bp = null;
		}
		}
		@@ -354,6 +367,7 @@ public final class BasePermission {
		if (bp == null) {
		bp = new BasePermission(p.getName(), p.getPackageName(), TYPE_NORMAL);
		}
		boolean wasNormal = bp.isNormal();
		StringBuilder r = null;
		if (bp.perm == null) {
		if (bp.sourcePackageName == null
		@@ -397,6 +411,11 @@ public final class BasePermission {
		&& Objects.equals(bp.perm.getName(), p.getName())) {
		bp.protectionLevel = p.getProtectionLevel();
		}
		if (bp.isRuntime() && (ownerChanged \|\| wasNormal)) {
		// If this is a runtime permission and the owner has changed, or this was a normal
		// permission, then permission state should be cleaned up
		bp.mPermissionDefinitionChanged = true;
		}
		if (PackageManagerService.DEBUG_PACKAGE_SCANNING && r != null) {
		Log.d(TAG, " Permissions: " + r);
		}

services/core/java/com/android/server/pm/permission/PermissionManagerService.java

+85 −5

Original line number	Diff line number	Diff line
		@@ -2344,8 +2344,74 @@ public class PermissionManagerService extends IPermissionManager.Stub {
		}
		}

		private void addAllPermissions(AndroidPackage pkg, boolean chatty) {
		/**
		* If permissions are upgraded to runtime, or their owner changes to the system, then any
		* granted permissions must be revoked.
		*
		* @param permissionsToRevoke A list of permission names to revoke
		* @param allPackageNames All package names
		* @param permissionCallback Callback for permission changed
		*/
		private void revokeRuntimePermissionsIfPermissionDefinitionChanged(
		@NonNull List<String> permissionsToRevoke,
		@NonNull ArrayList<String> allPackageNames,
		@NonNull PermissionCallback permissionCallback) {

		final int[] userIds = mUserManagerInt.getUserIds();
		final int numPermissions = permissionsToRevoke.size();
		final int numUserIds = userIds.length;
		final int numPackages = allPackageNames.size();
		final int callingUid = Binder.getCallingUid();

		for (int permNum = 0; permNum < numPermissions; permNum++) {
		String permName = permissionsToRevoke.get(permNum);
		BasePermission bp = mSettings.getPermission(permName);
		if (bp == null \|\| !bp.isRuntime()) {
		continue;
		}
		for (int userIdNum = 0; userIdNum < numUserIds; userIdNum++) {
		final int userId = userIds[userIdNum];
		for (int packageNum = 0; packageNum < numPackages; packageNum++) {
		final String packageName = allPackageNames.get(packageNum);
		final int uid = mPackageManagerInt.getPackageUid(packageName, 0, userId);
		if (uid < Process.FIRST_APPLICATION_UID) {
		// do not revoke from system apps
		continue;
		}
		final int permissionState = checkPermissionImpl(permName, packageName,
		userId);
		final int flags = getPermissionFlags(permName, packageName, userId);
		final int flagMask = FLAG_PERMISSION_SYSTEM_FIXED
		\| FLAG_PERMISSION_POLICY_FIXED
		\| FLAG_PERMISSION_GRANTED_BY_DEFAULT
		\| FLAG_PERMISSION_GRANTED_BY_ROLE;
		if (permissionState == PackageManager.PERMISSION_GRANTED
		&& (flags & flagMask) == 0) {
		EventLog.writeEvent(0x534e4554, "154505240", uid,
		"Revoking permission " + permName + " from package "
		+ packageName + " due to definition change");
		EventLog.writeEvent(0x534e4554, "168319670", uid,
		"Revoking permission " + permName + " from package "
		+ packageName + " due to definition change");
		Slog.e(TAG, "Revoking permission " + permName + " from package "
		+ packageName + " due to definition change");
		try {
		revokeRuntimePermissionInternal(permName, packageName,
		false, callingUid, userId, null, permissionCallback);
		} catch (Exception e) {
		Slog.e(TAG, "Could not revoke " + permName + " from "
		+ packageName, e);
		}
		}
		}
		}
		bp.setPermissionDefinitionChanged(false);
		}
		}

		private List<String> addAllPermissions(AndroidPackage pkg, boolean chatty) {
		final int N = ArrayUtils.size(pkg.getPermissions());
		ArrayList<String> definitionChangedPermissions = new ArrayList<>();
		for (int i=0; i<N; i++) {
		ParsedPermission p = pkg.getPermissions().get(i);

		@@ -2367,21 +2433,26 @@ public class PermissionManagerService extends IPermissionManager.Stub {
		}
		}

		final BasePermission bp;
		if (p.isTree()) {
		final BasePermission bp = BasePermission.createOrUpdate(
		bp = BasePermission.createOrUpdate(
		mPackageManagerInt,
		mSettings.getPermissionTreeLocked(p.getName()), p, pkg,
		mSettings.getAllPermissionTreesLocked(), chatty);
		mSettings.putPermissionTreeLocked(p.getName(), bp);
		} else {
		final BasePermission bp = BasePermission.createOrUpdate(
		bp = BasePermission.createOrUpdate(
		mPackageManagerInt,
		mSettings.getPermissionLocked(p.getName()),
		p, pkg, mSettings.getAllPermissionTreesLocked(), chatty);
		mSettings.putPermissionLocked(p.getName(), bp);
		}
		if (bp.isPermissionDefinitionChanged()) {
		definitionChangedPermissions.add(p.getName());
		}
		}
		}
		return definitionChangedPermissions;
		}

		private void addAllPermissionGroups(AndroidPackage pkg, boolean chatty) {
		@@ -4650,9 +4721,18 @@ public class PermissionManagerService extends IPermissionManager.Stub {
		PermissionManagerService.this.revokeRuntimePermissionsIfGroupChanged(newPackage,
		oldPackage, allPackageNames, mDefaultPermissionCallback);
		}

		@Override
		public void revokeRuntimePermissionsIfPermissionDefinitionChanged(
		@NonNull List<String> permissionsToRevoke,
		@NonNull ArrayList<String> allPackageNames) {
		PermissionManagerService.this.revokeRuntimePermissionsIfPermissionDefinitionChanged(
		permissionsToRevoke, allPackageNames, mDefaultPermissionCallback);
		}

		@Override
		public void addAllPermissions(AndroidPackage pkg, boolean chatty) {
		PermissionManagerService.this.addAllPermissions(pkg, chatty);
		public List<String> addAllPermissions(AndroidPackage pkg, boolean chatty) {
		return PermissionManagerService.this.addAllPermissions(pkg, chatty);
		}
		@Override
		public void addAllPermissionGroups(AndroidPackage pkg, boolean chatty) {

services/core/java/com/android/server/pm/permission/PermissionManagerServiceInternal.java

+15 −1

Original line number	Diff line number	Diff line
		@@ -253,13 +253,27 @@ public abstract class PermissionManagerServiceInternal extends PermissionManager
		@NonNull AndroidPackage oldPackage,
		@NonNull ArrayList<String> allPackageNames);

		/**
		* Some permissions might have been owned by a non-system package, and the system then defined
		* said permission. Some other permissions may one have been install permissions, but are now
		* runtime or higher. These permissions should be revoked.
		*
		* @param permissionsToRevoke A list of permission names to revoke
		* @param allPackageNames All packages
		*/
		public abstract void revokeRuntimePermissionsIfPermissionDefinitionChanged(
		@NonNull List<String> permissionsToRevoke,
		@NonNull ArrayList<String> allPackageNames);

		/**
		* Add all permissions in the given package.
		* <p>
		* NOTE: argument {@code groupTEMP} is temporary until mPermissionGroups is moved to
		* the permission settings.
		*
		* @return A list of BasePermissions that were updated, and need to be revoked from packages
		*/
		public abstract void addAllPermissions(@NonNull AndroidPackage pkg, boolean chatty);
		public abstract List<String> addAllPermissions(@NonNull AndroidPackage pkg, boolean chatty);
		public abstract void addAllPermissionGroups(@NonNull AndroidPackage pkg, boolean chatty);
		public abstract void removeAllPermissions(@NonNull AndroidPackage pkg, boolean chatty);