I have some troubles with GrSecurity learning mode and did not find any answer in https://en.wikibooks.org/wiki/Grsecurity/The_Administration_Utility#Learning_Mode Their ML appears to be dead, or restricted to announces now.
1) I let "gradm -F -L ..." run for a couple of weeks, then threw the logs to "gradm -F -L ... -O ...". It generated a rather restrictive policy, I twiked some rules, and when I implemented the policy, some programs were blocked although they had been seen many times (for example, Postfix components). I added "l" (learn) flags to the impacted "subjects", ran the learning process again and fixed most problems. Anyway, I still saw bizarre messages, e.g.: (default:D:/) denied access to hidden file /etc/localtime by /usr/sbin/fetchnews[fetchnews:22855] uid/euid:9/9 gid/egid:13/13, parent /etc/cron.daily/fetchnews[fetchnews:22854] uid/euid:0/0 gid/egid:0/0 /usr/sbin/fetchnews I don't understand why the default role complains here: I have a role for the "news" user and all programs than run under its UID avec an associated subject. 2) (incremental) learning of the news logs is awfully slow. # gradm -L /tmp/learning.logs -O /tmp/policy Beginning full learning object reduction for subject /usr/sbin/uptimed...done. [snip] Beginning full learning object reduction for subject /... The first subjects appeared quickly. Now, gradm has spend days on / using 100% CPU (on one core) and 1 GB. What mistake did I make?
