kona: Add rules for kernel 4.19 support for init domain

This is a set of vendor changes necessary for interworking
with kernel verison 4.19 properly.

With kernel 4.19, additional filesystem getattr operations
are performed by init for the firmware mount points.

In addition on bootup after adb remount with Android's
Dynamic Partition feature, init needs access to underlying
block devices for overlayfs mounting.  At that stage of
init, while SELinux is initialized (thus the need to add
these rules), the underlying block device nodes in tmpfs
have not yet be labeled.

Change-Id: Iaf15fda401da7b4a34e281e010e16303966bb2c0

generic/vendor/kona/init.te

@@ -0,0 +1,42 @@
+# Copyright (c) 2019, The Linux Foundation. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#     * Redistributions of source code must retain the above copyright
+#       notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+#       copyright notice, this list of conditions and the following
+#       disclaimer in the documentation and/or other materials provided
+#       with the distribution.
+#     * Neither the name of The Linux Foundation nor the names of its
+#       contributors may be used to endorse or promote products derived
+#       from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+# IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# Allow init to read/write/ioctl for mounting overlayfs
+# with kernel 4.19.  At the point of overlayfs mount
+# SELinux is initialized but labels tmpfs has not yet
+# been relabeled.
+#
+# This is only used for userdebug/eng in adb remount
+# scenario
+#
+# Temporary change
+userdebug_or_eng(`
+  allow init tmpfs:blk_file { ioctl read write open getattr };
+')
+
+allow init firmware_file:filesystem getattr;
+allow init bt_firmware_file:filesystem getattr;