| # lmkd low memory killer daemon |
| type lmkd, domain, domain_deprecated, mlstrustedsubject; |
| type lmkd_exec, exec_type, file_type; |
| |
| init_daemon_domain(lmkd) |
| |
| allow lmkd self:capability { dac_override 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:capability 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, autoplay_app) |
| allow lmkd autoplay_app:file write; |
| r_dir_file(lmkd, system_server) |
| allow lmkd system_server:file write; |
| |
| ## Writes to /sys/module/lowmemorykiller/parameters/minfree |
| 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 }; |
| |
| # Set self to SCHED_FIFO |
| allow lmkd self:capability sys_nice; |
| |
| ### neverallow rules |
| |
| # never honor LD_PRELOAD |
| neverallow * lmkd:process noatsecure; |