1# lmkd low memory killer daemon 2type lmkd, domain, mlstrustedsubject; 3type lmkd_exec, exec_type, file_type; 4 5allow lmkd self:capability { dac_override sys_resource kill }; 6 7# lmkd locks itself in memory, to prevent it from being 8# swapped out and unable to kill other memory hogs. 9# system/core commit b28ff9131363f7b4a698990da5748b2a88c3ed35 10# b/16236289 11allow lmkd self:capability ipc_lock; 12 13## Open and write to /proc/PID/oom_score_adj 14## TODO: maybe scope this down? 15r_dir_file(lmkd, appdomain) 16allow lmkd appdomain:file write; 17r_dir_file(lmkd, system_server) 18allow lmkd system_server:file write; 19 20## Writes to /sys/module/lowmemorykiller/parameters/minfree 21r_dir_file(lmkd, sysfs_type) 22allow lmkd sysfs_lowmemorykiller:file w_file_perms; 23 24# Send kill signals 25allow lmkd appdomain:process sigkill; 26 27# Clean up old cgroups 28allow lmkd cgroup:dir { remove_name rmdir }; 29 30# Allow to read memcg stats 31allow lmkd cgroup:file r_file_perms; 32 33# Set self to SCHED_FIFO 34allow lmkd self:capability sys_nice; 35 36allow lmkd proc_zoneinfo:file r_file_perms; 37 38### neverallow rules 39 40# never honor LD_PRELOAD 41neverallow * lmkd:process noatsecure; 42