platform_system_sepolicy/public/lmkd.te
Nick Kralevich 5e37271df8 Introduce system_file_type
system_file_type is a new attribute used to identify files which exist
on the /system partition. It's useful for allow rules in init, which are
based off of a blacklist of writable files. Additionally, it's useful
for constructing neverallow rules to prevent regressions.

Additionally, add commented out tests which enforce that all files on
the /system partition have the system_file_type attribute. These tests
will be uncommented in a future change after all the device-specific
policies are cleaned up.

Test: Device boots and no obvious problems.
Change-Id: Id9bae6625f042594c8eba74ca712abb09702c1e5
2018-09-27 12:52:09 -07:00

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# lmkd low memory killer daemon
type lmkd, domain, mlstrustedsubject;
type lmkd_exec, system_file_type, exec_type, file_type;
allow lmkd self:global_capability_class_set { dac_override dac_read_search sys_resource kill };
# lmkd locks itself in memory, to prevent it from being
# swapped out and unable to kill other memory hogs.
# system/core commit b28ff9131363f7b4a698990da5748b2a88c3ed35
# b/16236289
allow lmkd self:global_capability_class_set ipc_lock;
## Open and write to /proc/PID/oom_score_adj
## TODO: maybe scope this down?
r_dir_file(lmkd, appdomain)
allow lmkd appdomain:file write;
r_dir_file(lmkd, system_server)
allow lmkd system_server:file write;
## Writes to /sys/module/lowmemorykiller/parameters/minfree
r_dir_file(lmkd, sysfs_lowmemorykiller)
allow lmkd sysfs_lowmemorykiller:file w_file_perms;
# Send kill signals
allow lmkd appdomain:process sigkill;
# Clean up old cgroups
allow lmkd cgroup:dir { remove_name rmdir };
# Allow to read memcg stats
allow lmkd cgroup:file r_file_perms;
# Set self to SCHED_FIFO
allow lmkd self:global_capability_class_set sys_nice;
allow lmkd proc_zoneinfo:file r_file_perms;
# Set sys.lmk.* properties.
set_prop(lmkd, system_lmk_prop)
# live lock watchdog process allowed to look through /proc/
allow lmkd domain:dir { search open read };
allow lmkd domain:file { open read };
# live lock watchdog process allowed to dump process trace and
# reboot because orderly shutdown may not be possible.
allow lmkd proc_sysrq:file rw_file_perms;
# Read /proc/meminfo
allow lmkd proc_meminfo:file r_file_perms;
### neverallow rules
# never honor LD_PRELOAD
neverallow * lmkd:process noatsecure;