1# update_engine payload application permissions. These are shared between the
2# background daemon and the recovery tool to sideload an update.
3
4# Allow update_engine to reach block devices in /dev/block.
5allow update_engine_common block_device:dir search;
6
7# Allow read/write on system and boot partitions.
8allow update_engine_common boot_block_device:blk_file rw_file_perms;
9allow update_engine_common system_block_device:blk_file rw_file_perms;
10
11# Allow to set recovery options in the BCB. Used to trigger factory reset when
12# the update to an older version (channel change) or incompatible version
13# requires it.
14allow update_engine_common misc_block_device:blk_file rw_file_perms;
15
16# Allow update_engine_common to mount on the /postinstall directory and reset the
17# labels on the mounted filesystem to postinstall_file.
18allow update_engine_common postinstall_mnt_dir:dir mounton;
19allow update_engine_common postinstall_file:filesystem { mount unmount relabelfrom relabelto };
20allow update_engine_common labeledfs:filesystem relabelfrom;
21
22# Allow update_engine_common to read and execute postinstall_file.
23allow update_engine_common postinstall_file:file rx_file_perms;
24allow update_engine_common postinstall_file:lnk_file r_file_perms;
25allow update_engine_common postinstall_file:dir r_dir_perms;
26
27
28# A postinstall program is typically a shell script (with a #!), so we allow
29# to execute those.
30allow update_engine_common shell_exec:file rx_file_perms;
31
32# Allow update_engine_common to suspend, resume and kill the postinstall program.
33allow update_engine_common postinstall:process { signal sigstop sigkill };
34
35# access /proc/misc
36# Access is also granted to proc:file, but it is likely unneeded
37# due to the more specific grant to proc_misc immediately below.
38allow update_engine proc:file r_file_perms; # delete candidate
39allow update_engine proc_misc:file r_file_perms;
40
41# read directories on /system and /vendor
42allow update_engine system_file:dir r_dir_perms;
43