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Bug 2164434 - RFE: dontaudit execmem for ftpd_t
Summary: RFE: dontaudit execmem for ftpd_t
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: selinux-policy
Version: 9.1
Hardware: Unspecified
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Nikola Knazekova
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2023-01-25 14:40 UTC by Paul Howarth
Modified: 2023-05-09 10:22 UTC (History)
7 users (show)

Fixed In Version: selinux-policy-38.1.6-1.el9
Doc Type: No Doc Update
Doc Text:
Clone Of: 2161705
Environment:
Last Closed: 2023-05-09 08:17:16 UTC
Type: Bug
Target Upstream Version:
Embargoed:
pm-rhel: mirror+

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-146412 0 None None None 2023-01-25 14:41:08 UTC
Red Hat Product Errata RHBA-2023:2483 0 None None None 2023-05-09 08:17:47 UTC

Description Paul Howarth 2023-01-25 14:40:47 UTC 
+++ This bug was initially created as a clone of Bug #2161705 +++

Hello,

I am the package maintainer of the proftpd FTP server in Fedora/EPEL. I have recently been asked to add support for PCRE2-based regular expressions to proftpd (Bug #2158885), and doing this results in this AVC:

type=AVC msg=audit(1673174151.123:562134): avc:  denied  { execmem } for  pid=2352865 comm="proftpd" scontext=system_u:system_r:ftpd_t:s0-s0:c0.c1023 tcontext=system_u:system_r:ftpd_t:s0-s0:c0.c1023 tclass=process permissive=0

I believe that this is due to memory allocation in the PCRE2 JIT compiler, and has resulted in similar issues before (e.g. Bug #1290432, Bug #2122918).

My understanding is that the PCRE2 regexp functionality in proftpd falls back to the slower regexp interpreter if the JIT compiler cannot be used, which I think is the best approach here, hence the request to dontaudit this denial rather than allowing execmem.

Ideally I'd like to update proftpd in F-37, Rawhide and EPEL-9 to support PCRE2, and it would be nice not to have these AVCs showing up.

I appreciate that a policy update in RHEL9 would be needed to address this for the EPEL-9 package. Would I need to create a separate ticket for that?

--- Additional comment from Zdenek Pytela on 2023-01-17 18:41:10 UTC ---

Hello Paul,

This seems to be a reasonable request for Fedora. Note there is an ongoing internal discussion how to approach this issue in general, currently with no conclusion.

For RHEL 9, a cloned bz is needed, but a prompt resolution cannot be expected.
Comment 12 errata-xmlrpc 2023-05-09 08:17:16 UTC 
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 (selinux-policy bug fix and enhancement update), 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/RHBA-2023:2483
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