a42ebf4128
Directory `/postinstall/apex` is used as a mount point for a tmpfs
filesystem during A/B OTA updates. APEX packages from the new system
partition are mounted ("activated") in subdirectories of
`/postinstall/apex`, so that they are available when `otapreopt` is
running.
Directory `/postinstall/apex` used to be of type `tmpfs` for SELinux
purposes. The new `postinstall_apex_mnt_dir` label is more
restrictive, and tightens permissions granted to `otapreopt_chroot`,
`otapreopt` (running as `postinstall_dexopt`), and `dex2oat`,
regarding the apexd logic recently added to `otapreopt_chroot`.
Test: A/B OTA update test (asit/dexoptota/self_full).
Bug: 113373927
Bug: 120796514
Change-Id: I03f0b0433d9c066a0c607f864d60ca62fc68c990
37 lines
1.5 KiB
Text
37 lines
1.5 KiB
Text
typeattribute otapreopt_chroot coredomain;
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# Allow to transition to postinstall_dexopt, to run otapreopt in its own sandbox.
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domain_auto_trans(otapreopt_chroot, postinstall_file, postinstall_dexopt)
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# Allow otapreopt_chroot to create loop devices with /dev/loop-control.
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allow otapreopt_chroot loop_control_device:chr_file rw_file_perms;
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# Allow otapreopt_chroot to access loop devices.
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allow otapreopt_chroot loop_device:blk_file rw_file_perms;
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allowxperm otapreopt_chroot loop_device:blk_file ioctl {
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LOOP_GET_STATUS64
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LOOP_SET_STATUS64
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LOOP_SET_FD
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LOOP_SET_BLOCK_SIZE
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LOOP_SET_DIRECT_IO
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LOOP_CLR_FD
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BLKFLSBUF
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};
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# Allow otapreopt_chroot to configure read-ahead of loop devices.
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allow otapreopt_chroot sysfs_loop:dir r_dir_perms;
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allow otapreopt_chroot sysfs_loop:file rw_file_perms;
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# Allow otapreopt_chroot to mount a tmpfs filesystem in /postinstall/apex.
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allow otapreopt_chroot tmpfs:filesystem mount;
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# Allow otapreopt_chroot to restore the security context of /postinstall/apex.
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allow otapreopt_chroot tmpfs:dir relabelfrom;
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allow otapreopt_chroot postinstall_apex_mnt_dir:dir relabelto;
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# Allow otapreopt_chroot to manipulate directory /postinstall/apex.
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allow otapreopt_chroot postinstall_apex_mnt_dir:dir create_dir_perms;
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# Allow otapreopt_chroot to mount APEX packages in /postinstall/apex.
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allow otapreopt_chroot postinstall_apex_mnt_dir:dir mounton;
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# Allow otapreopt_chroot to access /dev/block (needed to detach loop
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# devices used by ext4 images from APEX packages).
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allow otapreopt_chroot block_device:dir r_dir_perms;
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