import android.graphics.Bitmap;
import android.hardware.display.DisplayManager;
import android.net.Uri;
+import android.os.AsyncTask;
import android.os.Binder;
import android.os.Build;
import android.os.Bundle;
killUid(appId, userId, KILL_APP_REASON_PERMISSIONS_REVOKED);
}
+ /**
+ * We might auto-grant permissions if any permission of the group is already granted. Hence if
+ * the group of a granted permission changes we need to revoke it to avoid having permissions of
+ * the new group auto-granted.
+ *
+ * @param newPackage The new package that was installed
+ * @param oldPackage The old package that was updated
+ * @param allPackageNames All package names
+ */
+ private void revokeRuntimePermissionsIfGroupChanged(
+ PackageParser.Package newPackage,
+ PackageParser.Package oldPackage,
+ ArrayList<String> allPackageNames) {
+ final int numOldPackagePermissions = oldPackage.permissions.size();
+ final ArrayMap<String, String> oldPermissionNameToGroupName
+ = new ArrayMap<>(numOldPackagePermissions);
+
+ for (int i = 0; i < numOldPackagePermissions; i++) {
+ final PackageParser.Permission permission = oldPackage.permissions.get(i);
+
+ if (permission.group != null) {
+ oldPermissionNameToGroupName.put(permission.info.name,
+ permission.group.info.name);
+ }
+ }
+
+ final int numNewPackagePermissions = newPackage.permissions.size();
+ for (int newPermissionNum = 0; newPermissionNum < numNewPackagePermissions;
+ newPermissionNum++) {
+ final PackageParser.Permission newPermission =
+ newPackage.permissions.get(newPermissionNum);
+ final int newProtection = newPermission.info.protectionLevel;
+
+ if ((newProtection & PermissionInfo.PROTECTION_DANGEROUS) != 0) {
+ final String permissionName = newPermission.info.name;
+ final String newPermissionGroupName =
+ newPermission.group == null ? null : newPermission.group.info.name;
+ final String oldPermissionGroupName = oldPermissionNameToGroupName.get(
+ permissionName);
+
+ if (newPermissionGroupName != null
+ && !newPermissionGroupName.equals(oldPermissionGroupName)) {
+ final List<UserInfo> users = mContext.getSystemService(UserManager.class)
+ .getUsers();
+
+ final int numUsers = users.size();
+ for (int userNum = 0; userNum < numUsers; userNum++) {
+ final int userId = users.get(userNum).id;
+ final int numPackages = allPackageNames.size();
+ for (int packageNum = 0; packageNum < numPackages; packageNum++) {
+ final String packageName = allPackageNames.get(packageNum);
+
+ if (checkPermission(permissionName, packageName, userId)
+ == PackageManager.PERMISSION_GRANTED) {
+ EventLog.writeEvent(0x534e4554, "72710897",
+ newPackage.applicationInfo.uid,
+ "Revoking permission", permissionName, "from package",
+ packageName, "as the group changed from",
+ oldPermissionGroupName, "to", newPermissionGroupName);
+
+ try {
+ revokeRuntimePermission(packageName, permissionName, userId);
+ } catch (IllegalArgumentException e) {
+ Slog.e(TAG, "Could not revoke " + permissionName + " from "
+ + packageName, e);
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+
@Override
public void resetRuntimePermissions() {
mContext.enforceCallingOrSelfPermission(
Log.d(TAG, "Scanning package " + pkg.packageName);
}
+ final PackageParser.Package oldPkg;
+
synchronized (mPackages) {
if (mPackages.containsKey(pkg.packageName)
|| mSharedLibraries.containsKey(pkg.packageName)) {
+ " already installed. Skipping duplicate.");
}
+ final PackageSetting oldPkgSetting = mSettings.peekPackageLPr(pkg.packageName);
+ if (oldPkgSetting == null) {
+ oldPkg = null;
+ } else {
+ oldPkg = oldPkgSetting.pkg;
+ }
+
// If we're only installing presumed-existing packages, require that the
// scanned APK is both already known and at the path previously established
// for it. Previously unknown packages we pick up normally, but if we have an
// This is a regular package, with one or more known overlay packages.
createIdmapsForPackageLI(pkg);
}
+
+ if (oldPkg != null) {
+ // We need to call revokeRuntimePermissionsIfGroupChanged async as permission
+ // revokation from this method might need to kill apps which need the
+ // mPackages lock on a different thread. This would dead lock.
+ //
+ // Hence create a copy of all package names and pass it into
+ // revokeRuntimePermissionsIfGroupChanged. Only for those permissions might get
+ // revoked. If a new package is added before the async code runs the permission
+ // won't be granted yet, hence new packages are no problem.
+ final ArrayList<String> allPackageNames = new ArrayList<>(mPackages.keySet());
+
+ AsyncTask.execute(new Runnable() {
+ public void run() {
+ revokeRuntimePermissionsIfGroupChanged(pkg, oldPkg, allPackageNames);
+ }
+ });
+ }
}
Trace.traceEnd(TRACE_TAG_PACKAGE_MANAGER);
+ perm.info.name + "; ignoring new declaration");
pkg.permissions.remove(i);
}
+ } else if (!PLATFORM_PACKAGE_NAME.equals(pkg.packageName)) {
+ // Prevent apps to change protection level to dangerous from any other
+ // type as this would allow a privilege escalation where an app adds a
+ // normal/signature permission in other app's group and later redefines
+ // it as dangerous leading to the group auto-grant.
+ if ((perm.info.protectionLevel & PermissionInfo.PROTECTION_MASK_BASE)
+ == PermissionInfo.PROTECTION_DANGEROUS) {
+ if (bp != null && !bp.isRuntime()) {
+ Slog.w(TAG, "Package " + pkg.packageName + " trying to change a "
+ + "non-runtime permission " + perm.info.name
+ + " to runtime; keeping old protection level");
+ perm.info.protectionLevel = bp.protectionLevel;
+ }
+ }
}
}
}
@Override
public boolean isPackageDeviceAdminOnAnyUser(String packageName) {
+ final int callingUid = Binder.getCallingUid();
+ if (checkUidPermission(android.Manifest.permission.MANAGE_USERS, callingUid)
+ != PERMISSION_GRANTED) {
+ EventLog.writeEvent(0x534e4554, "128599183", -1, "");
+ throw new SecurityException(android.Manifest.permission.MANAGE_USERS
+ + " permission is required to call this API");
+ }
return isPackageDeviceAdmin(packageName, UserHandle.USER_ALL);
}
OSDN Git Service
