Description of problem: tried to plug printer in usb port SELinux is preventing cnij_usb from using the 'execmem' accesses on a process. ***** Plugin catchall_boolean (89.3 confidence) suggests ****************** If you want to allow cups execmem/execstack Then you must tell SELinux about this by enabling the 'cups_execmem' boolean. You can read 'None' man page for more details. Do setsebool -P cups_execmem 1 ***** Plugin catchall (11.6 confidence) suggests ************************** If you believe that cnij_usb should be allowed execmem access on processes labeled cupsd_t by default. Then you should report this as a bug. You can generate a local policy module to allow this access. Do allow this access for now by executing: # grep cnij_usb /var/log/audit/audit.log | audit2allow -M mypol # semodule -i mypol.pp Additional Information: Source Context system_u:system_r:cupsd_t:s0-s0:c0.c1023 Target Context system_u:system_r:cupsd_t:s0-s0:c0.c1023 Target Objects Unknown [ process ] Source cnij_usb Source Path cnij_usb Port <Unknown> Host (removed) Source RPM Packages Target RPM Packages Policy RPM selinux-policy-3.13.1-158.6.fc23.noarch Selinux Enabled True Policy Type targeted Enforcing Mode Enforcing Host Name (removed) Platform Linux (removed) 4.3.5-300.fc23.x86_64 #1 SMP Mon Feb 1 03:18:41 UTC 2016 x86_64 x86_64 Alert Count 2 First Seen 2016-02-29 14:11:45 CET Last Seen 2016-02-29 14:11:45 CET Local ID e41d6300-76f8-4485-bd27-427b84858b59 Raw Audit Messages type=AVC msg=audit(1456751505.571:426): avc: denied { execmem } for pid=22013 comm="cnij_parallel" scontext=system_u:system_r:cupsd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:cupsd_t:s0-s0:c0.c1023 tclass=process permissive=0 Hash: cnij_usb,cupsd_t,cupsd_t,process,execmem Version-Release number of selected component: selinux-policy-3.13.1-158.6.fc23.noarch Additional info: reporter: libreport-2.6.4 hashmarkername: setroubleshoot kernel: 4.3.5-300.fc23.x86_64 type: libreport
***** Plugin catchall_boolean (89.3 confidence) suggests ****************** If you want to allow cups execmem/execstack Then you must tell SELinux about this by enabling the 'cups_execmem' boolean. You can read 'None' man page for more details. Do setsebool -P cups_execmem 1
I do not know if I want to allow cups execmem/execstack I just want to plug a new USB printer on my PC and have it work without scary SElinux alerts that I do not understand. Printing went fine without doing any selinux magic though, so I guess this unneeded alert can be considered a bug ; no?
I may be a cups bug though instead of a selinux one I do not personally know enough to assign blames If need be, could this bug be redirected to its right owner instead of being closed? From my point of view, there really was a bug somewhere, just maybe not where the automatic tools proposed to assign it.
It is not an SELinux issue. These access should not be needed. We can either report them or cover them up with dontaudit rules. Is cnij_parallel something in the base cups package?
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