September 2014
Intermediate to advanced
240 pages
5h 53m
English
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Looking through SELinux constraints
Some denials are caused by SELinux constraints—additional restrictions imposed by the SELinux policy that are not purely based on the SELinux types, but also on the SELinux role and SELinux user. This is often not clear from the denial.
The audit2why application helps in informing developers that a denial came from a constraint violation:
~# ausearch -m avc -ts recent | grep type=AVC | audit2why type=AVC msg=audit(1401134596.932:62843): avc: denied { search } for pid=19384 comm="mount.nfs4" scontext=system_u:system_r:mount_t:s0 tcontext=system_u:object_r:nfs_t:s0 tclass=dir Was caused by: Policy constraint violation. May require adding a type attribute to the domain or type to satisfy the constraint. Constraints ...
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