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Description of problem: SELinux enforcing status affects systemd's ability to change the maximum locked memory for a unit. This is not expected or logical behaviour. This breaks elasticsearch with selinux enforcing on Fedora 25. Version-Release number of selected component (if applicable): systemd-231-12.fc25.x86_64 How reproducible: Very. Reproducible on stock minimal Fedora Server install. Steps to Reproduce: 1. Create service file /etc/systemd/system/memlockbug.service, contents: [Unit] Description=Test memlock bug [Service] ExecStart=/bin/sh -c 'cat /proc/self/limits' LimitMEMLOCK=infinity:infinity 2. Run it with selinux enforcing, then look at journal for the unit, output: Jan 11 09:41:25 lf-test sh[16890]: Max processes 7441 7441 processes Jan 11 09:41:25 lf-test sh[16890]: Max open files 1024 4096 files Jan 11 09:41:25 lf-test sh[16890]: Max locked memory 65536 unlimited bytes Jan 11 09:41:25 lf-test sh[16890]: Max address space unlimited unlimited bytes Jan 11 09:41:25 lf-test sh[16890]: Max file locks unlimited unlimited locks Jan 11 09:41:25 lf-test sh[16890]: Max pending signals 7441 7441 signals Jan 11 09:41:25 lf-test sh[16890]: Max msgqueue size 819200 819200 bytes Jan 11 09:41:25 lf-test sh[16890]: Max nice priority 0 0 Jan 11 09:41:25 lf-test sh[16890]: Max realtime priority 0 0 Jan 11 09:41:25 lf-test sh[16890]: Max realtime timeout unlimited unlimited us Expected result (obtained in permissive mode): Jan 11 09:46:26 lf-test sh[16905]: Max processes 7441 7441 processes Jan 11 09:46:26 lf-test sh[16905]: Max open files 1024 4096 files Jan 11 09:46:26 lf-test sh[16905]: Max locked memory unlimited unlimited bytes Jan 11 09:46:26 lf-test sh[16905]: Max address space unlimited unlimited bytes Jan 11 09:46:26 lf-test sh[16905]: Max file locks unlimited unlimited locks Jan 11 09:46:26 lf-test sh[16905]: Max pending signals 7441 7441 signals Jan 11 09:46:26 lf-test sh[16905]: Max msgqueue size 819200 819200 bytes Jan 11 09:46:26 lf-test sh[16905]: Max nice priority 0 0 Jan 11 09:46:26 lf-test sh[16905]: Max realtime priority 0 0 Jan 11 09:46:26 lf-test sh[16905]: Max realtime timeout unlimited unlimited us Summary of logs: Permissive: Jan 11 09:46:26 lf-test sh[16905]: Max locked memory unlimited unlimited bytes Enforcing: Jan 11 09:41:25 lf-test sh[16890]: Max locked memory 65536 unlimited bytes
Sorry, forgot to add: There are no denials whatsoever in the selinux log that are related to this (well there are some old sock_stream listen denials, but none occur on startup of my test unit).
So I debugged this more. It *is* caused by denials which are set to dontaudit. It's not surprising that systemd limits are applied through inheritance and so the denial of that inheritance breaks the limits functionality. type=AVC msg=audit(1491714305.693:226): avc: denied { rlimitinh } for pid=1067 comm="sh" scontext=system_u:system_r:init_t:s0 tcontext=system_u:system_r:initrc_t:s0 tclass=process permissive=0 Generated fix with audit2allow (which is, for what it's worth, a bit overbroad): module memlockbug 1.0; require { type initrc_t; type init_t; class process rlimitinh; } #============= init_t ============== allow init_t initrc_t:process rlimitinh;
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Fedora 25 changed to end-of-life (EOL) status on 2017-12-12. Fedora 25 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.