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Description of problem:
Default fapolicyd rule set prevents file access by /usr/bin/perl Process is not caught as a perl, though, thus falsely allowing the access.
Version-Release number of selected component (if applicable):
fapolicyd-0.8.10-3.el8.x86_64
How reproducible:
reliable
Steps to Reproduce:
1.
[root@localhost ~]# grep perl /etc/fapolicyd/fapolicyd.rules
# Block all perl
deny_audit exe=/usr/bin/perl all
#allow all dir=execdirs ftype=text/x-perl
#deny_audit all ftype=text/x-perl
2. fapolicyd --debug (in one window)
3. /usr/bin/perl -e'print $$;open F, "./ahoj" or die'
Actual results:
fapolicyd --debug reports "rule:18 dec=allow auid=1000 pid=5783 exe=/usr/bin/bash file=/home/admin/ahoj"
perl command returns same PID
Expected results:
Command is properly disrupted and identified as perl
Additional info:
This is caused by bad cache management. The latest upstream release should work as expected because it hooks the fanotify EXEC_PERM kernel option to correctly delete the bash cache entry.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHEA-2020:1687