Allow init and vold writing misc block device.

Bug: 27176738
Change-Id: Ib52bb94973d20591dd440cea42aadfa53d476848

init.te

@@ -286,6 +286,9 @@ allow init unencrypted_data_file:dir create_dir_perms;
 
 unix_socket_connect(init, vold, vold)
 
+# Raw writes to misc block device
+allow init misc_block_device:blk_file w_file_perms;
+
 ###
 ### neverallow rules
 ###

vold.te

@@ -189,6 +189,9 @@ allow vold toolbox_exec:file rx_file_perms;
 allow vold user_profile_data_file:dir create_dir_perms;
 allow vold user_profile_foreign_dex_data_file:dir { getattr setattr };
 
+# Raw writes to misc block device
+allow vold misc_block_device:blk_file w_file_perms;
+
 neverallow { domain -vold } vold_data_file:dir ~{ open create read getattr setattr search relabelto ioctl };
 neverallow { domain -vold } vold_data_file:notdevfile_class_set ~{ relabelto getattr };
 neverallow { domain -vold -init } vold_data_file:dir *;