2013-12-05 16:55:34 -08:00
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# lmkd low memory killer daemon
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2016-11-25 17:37:30 -08:00
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type lmkd, domain, mlstrustedsubject;
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2018-09-27 10:21:37 -07:00
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type lmkd_exec, system_file_type, exec_type, file_type;
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2013-12-05 16:55:34 -08:00
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2018-09-06 15:19:40 -07:00
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allow lmkd self:global_capability_class_set { dac_override dac_read_search sys_resource kill };
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2014-02-13 12:19:50 -08:00
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2014-07-16 11:45:51 -07:00
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# lmkd locks itself in memory, to prevent it from being
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# swapped out and unable to kill other memory hogs.
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# system/core commit b28ff9131363f7b4a698990da5748b2a88c3ed35
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# b/16236289
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2017-11-09 14:51:26 -08:00
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allow lmkd self:global_capability_class_set ipc_lock;
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2014-07-16 11:45:51 -07:00
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2019-10-18 11:29:44 -07:00
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## Open and write to /proc/PID/oom_score_adj and /proc/PID/timerslack_ns
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2014-02-13 12:19:50 -08:00
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## TODO: maybe scope this down?
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2019-10-18 11:29:44 -07:00
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r_dir_file(lmkd, domain)
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allow lmkd domain:file write;
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2014-02-13 12:19:50 -08:00
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## Writes to /sys/module/lowmemorykiller/parameters/minfree
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2017-09-20 16:29:23 -07:00
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r_dir_file(lmkd, sysfs_lowmemorykiller)
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2014-02-13 12:19:50 -08:00
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allow lmkd sysfs_lowmemorykiller:file w_file_perms;
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2014-03-04 17:15:13 -08:00
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2019-10-18 11:29:44 -07:00
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# setsched and send kill signals to any registered process
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allow lmkd domain:process { setsched sigkill };
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2019-05-02 08:29:21 -07:00
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# TODO: delete this line b/131761776
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2019-03-14 11:59:04 -07:00
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allow lmkd kernel:process { setsched };
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2014-07-14 17:39:15 -07:00
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# Clean up old cgroups
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allow lmkd cgroup:dir { remove_name rmdir };
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2017-08-30 14:02:38 -07:00
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# Allow to read memcg stats
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allow lmkd cgroup:file r_file_perms;
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2014-07-14 17:39:15 -07:00
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# Set self to SCHED_FIFO
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2017-11-09 14:51:26 -08:00
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allow lmkd self:global_capability_class_set sys_nice;
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2014-07-16 18:42:36 -07:00
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2016-08-08 10:48:01 -07:00
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allow lmkd proc_zoneinfo:file r_file_perms;
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2019-08-12 09:43:06 -07:00
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allow lmkd proc_vmstat:file r_file_perms;
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2016-08-08 10:48:01 -07:00
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2018-07-24 17:04:18 -07:00
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# Set sys.lmk.* properties.
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set_prop(lmkd, system_lmk_prop)
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2018-02-01 09:35:14 -08:00
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# live lock watchdog process allowed to look through /proc/
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allow lmkd domain:dir { search open read };
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allow lmkd domain:file { open read };
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# live lock watchdog process allowed to dump process trace and
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# reboot because orderly shutdown may not be possible.
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allow lmkd proc_sysrq:file rw_file_perms;
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2019-04-26 09:27:58 -07:00
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# Read /proc/lowmemorykiller
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allow lmkd proc_lowmemorykiller:file r_file_perms;
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2018-03-29 12:30:58 -07:00
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# Read /proc/meminfo
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allow lmkd proc_meminfo:file r_file_perms;
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2018-05-10 15:36:59 -07:00
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# Read /proc/pressure/cpu and /proc/pressure/io
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allow lmkd proc_pressure_cpu:file r_file_perms;
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allow lmkd proc_pressure_io:file r_file_perms;
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# Read/Write /proc/pressure/memory
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allow lmkd proc_pressure_mem:file rw_file_perms;
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2018-10-08 13:15:10 -07:00
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# Allow lmkd to write to statsd.
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unix_socket_send(lmkd, statsdw, statsd)
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2014-07-16 18:42:36 -07:00
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### neverallow rules
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# never honor LD_PRELOAD
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2016-02-05 14:48:03 -08:00
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neverallow * lmkd:process noatsecure;
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2019-10-18 11:29:44 -07:00
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neverallow lmkd self:global_capability_class_set sys_ptrace;
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