Allow `otapreopt_chroot` to mount APEX packages using `apexd` logic.
Allow `otapreopt_chroot` to:
- read SELinux policy files;
- open and read the contents of `/postinstall/system/apex`;
- read the `persist.apexd.verity_on_system` system property;
- create loop devices with `/dev/loop-control`;
- access loop devices;
- configure read-ahead of loop devices;
- mount a tmpfs filesystem in `/postinstall/apex`;
- manipulate the tmpfs filesystem mounted in `/postinstall/apex`;
- mount APEX packages in `/postinstall/apex`.
Allow the kernel to:
- read `otapreopt_chroot`'s file descriptors;
- read files under `/postinstall`.
Allow `otapreopt` (running as "postinstall_dexopt") to:
- read data from `/postinstall/apex`.
Allow `dex2oat` to:
- access `/postinstall/apex`.
Test: A/B OTA update test (asit/dexoptota/self_full).
Bug: 113373927
Bug: 120796514
Change-Id: I204df92611dc710fdc97b22cd67d088ffd991210
diff --git a/private/otapreopt_chroot.te b/private/otapreopt_chroot.te
index 1f69931..9a9fb5f 100644
--- a/private/otapreopt_chroot.te
+++ b/private/otapreopt_chroot.te
@@ -2,3 +2,28 @@
# Allow to transition to postinstall_ota, to run otapreopt in its own sandbox.
domain_auto_trans(otapreopt_chroot, postinstall_file, postinstall_dexopt)
+
+# Allow otapreopt_chroot to create loop devices with /dev/loop-control.
+allow otapreopt_chroot loop_control_device:chr_file rw_file_perms;
+# Allow otapreopt_chroot to access loop devices.
+allow otapreopt_chroot loop_device:blk_file rw_file_perms;
+allowxperm otapreopt_chroot loop_device:blk_file ioctl {
+ LOOP_GET_STATUS64
+ LOOP_SET_STATUS64
+ LOOP_SET_FD
+ LOOP_SET_BLOCK_SIZE
+ LOOP_SET_DIRECT_IO
+ LOOP_CLR_FD
+ BLKFLSBUF
+};
+
+# Allow otapreopt_chroot to configure read-ahead of loop devices.
+allow otapreopt_chroot sysfs_loop:dir r_dir_perms;
+allow otapreopt_chroot sysfs_loop:file rw_file_perms;
+
+# Allow otapreopt_chroot to mount a tmpfs filesystem in /postinstall/apex.
+allow otapreopt_chroot tmpfs:filesystem mount;
+# Allow otapreopt_chroot to manipulate the tmpfs filesystem mounted in /postinstall/apex.
+allow otapreopt_chroot tmpfs:dir create_dir_perms;
+# Allow otapreopt_chroot to mount APEX packages in /postinstall/apex.
+allow otapreopt_chroot tmpfs:dir mounton;