f7e9111376
During OTA install, update_engine needs to read this file to determine
if overlayfs is enabled, as OTA requires overlayfs to be disabled.
The selinux denial looks like
audit(0.0:242): avc: denied { read } for name="filesystems"
dev="proc" ino=4026532076 scontext=u:r:update_engine:s0
tcontext=u:object_r:proc_filesystems:s0 tclass=file permissive=0
Bug: 309812002
Test: th
Change-Id: I10903ced21e79c90dec45fb40ecd169d98c94e89
79 lines
3 KiB
Text
79 lines
3 KiB
Text
# Domain for update_engine daemon.
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type update_engine, domain, update_engine_common;
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type update_engine_exec, system_file_type, exec_type, file_type;
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net_domain(update_engine);
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# Following permissions are needed for update_engine.
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allow update_engine self:process { setsched };
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allow update_engine self:global_capability_class_set { fowner sys_admin };
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# Note: fsetid checks are triggered when creating a file in a directory with
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# the setgid bit set to determine if the file should inherit setgid. In this
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# case, setgid on the file is undesirable so we should just suppress the
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# denial.
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dontaudit update_engine self:global_capability_class_set fsetid;
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allow update_engine kmsg_device:chr_file { getattr w_file_perms };
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allow update_engine update_engine_exec:file rx_file_perms;
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wakelock_use(update_engine);
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# Ignore these denials.
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dontaudit update_engine kernel:process setsched;
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dontaudit update_engine self:global_capability_class_set sys_rawio;
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# Allow using persistent storage in /data/misc/update_engine.
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allow update_engine update_engine_data_file:dir create_dir_perms;
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allow update_engine update_engine_data_file:file create_file_perms;
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# Allow using persistent storage in /data/misc/update_engine_log.
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allow update_engine update_engine_log_data_file:dir create_dir_perms;
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allow update_engine update_engine_log_data_file:file create_file_perms;
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# Register the service to perform Binder IPC.
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binder_use(update_engine)
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add_service(update_engine, update_engine_service)
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add_service(update_engine, update_engine_stable_service)
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# Allow update_engine to call the callback function provided by priv_app/GMS core.
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binder_call(update_engine, priv_app)
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# b/142672293: No other priv-app should need this rule now that GMS core runs in its own domain.
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userdebug_or_eng(`
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auditallow update_engine priv_app:binder { call transfer };
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auditallow priv_app update_engine:binder transfer;
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auditallow update_engine priv_app:fd use;
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')
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binder_call(update_engine, gmscore_app)
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# Allow update_engine to call the callback function provided by system_server.
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binder_call(update_engine, system_server)
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# Read OTA zip file at /data/ota_package/.
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allow update_engine ota_package_file:file r_file_perms;
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allow update_engine ota_package_file:dir r_dir_perms;
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# Use Boot Control HAL
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hal_client_domain(update_engine, hal_bootctl)
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# access /proc/misc
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allow update_engine proc_misc:file r_file_perms;
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# read directories on /system and /vendor
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allow update_engine system_file:dir r_dir_perms;
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# Allow ReadDefaultFstab().
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# update_engine tries to determine the parent path for all devices (e.g.
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# /dev/block/by-name) by reading the default fstab and looking for the misc
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# device.
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read_fstab(update_engine)
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# Allow to write to snapshotctl_log logs.
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# TODO(b/148818798) revert when parent bug is fixed.
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userdebug_or_eng(`
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allow update_engine snapshotctl_log_data_file:dir rw_dir_perms;
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allow update_engine snapshotctl_log_data_file:file create_file_perms;
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')
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# Allow determining filesystems available on system.
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# Needed for checking if overlayfs is enabled
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allow update_engine proc_filesystems:file r_file_perms;
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