>From the manual page capabilities(7):
CAP_SYS_NICE
* Lower the process nice value (nice(2), setpriority(2)) and
change the nice value for arbitrary processes;
* set real-time scheduling policies for calling process, and set
scheduling policies and priorities for arbitrary processes
(sched_setscheduler(2), sched_setparam(2), sched_setattr(2));
* set CPU affinity for arbitrary processes (sched_setaffin‐
ity(2));
* set I/O scheduling class and priority for arbitrary processes
(ioprio_set(2));
* apply migrate_pages(2) to arbitrary processes and allow pro‐
cesses to be migrated to arbitrary nodes;
* apply move_pages(2) to arbitrary processes;
* use the MPOL_MF_MOVE_ALL flag with mbind(2) and move_pages(2)
No idea, if cups-browsed should be allowed to change the nice value of
*arbitrary* processes.
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https://bugs.launchpad.net/bugs/1897369
Title:
apparmor: Allow cups-browsed to change nice value (CAP_SYS_NICE)
Status in cups package in Ubuntu:
New
Bug description:
In Ubuntu 20.04.1 with *cups-browsed* 1.27.4-1, apparmor prevents
`/usr/sbin/cups-browsed` to change its nice value.
$ sudo dmesg | grep apparmor
[541870.509461] audit: type=1400 audit(1600898428.089:60):
apparmor="DENIED" operation="capable" profile="/usr/sbin/cups-browsed"
pid=62030 comm="cups-browsed" capability=23 capname="sys_nice"
[628298.779668] audit: type=1400 audit(1600984854.115:61):
apparmor="DENIED" operation="capable" profile="/usr/sbin/cups-browsed"
pid=66850 comm="cups-browsed" capability=23 capname="sys_nice"
[714667.424963] audit: type=1400 audit(1601071220.527:62):
apparmor="DENIED" operation="capable" profile="/usr/sbin/cups-browsed"
pid=76828 comm="cups-browsed" capability=23 capname="sys_nice"
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