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Bug 2014228 - libffi: Python scripts crash with ANOM_ABEND when SELinux is enabled
Summary: libffi: Python scripts crash with ANOM_ABEND when SELinux is enabled
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: libffi
Version: 8.4
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: DJ Delorie
QA Contact: Lenka Špačková
Jacob Taylor Valdez
URL:
Whiteboard:
Depends On:
Blocks: 2152228
TreeView+ depends on / blocked
 
Reported: 2021-10-14 16:23 UTC by Paulo Andrade
Modified: 2023-05-16 11:17 UTC (History)
5 users (show)

Fixed In Version: libffi-3.1-24.el8
Doc Type: Bug Fix
Doc Text:
.`libffi` can now probe for executable memory with SELinux enabled By default, `libffi` does not probe for executable memory when SELinux is enabled. As a consequence, programs which use `libffi` closures and `fork()` without immediately executing some other processes terminate unexpectedly when SELinux is enabled. With this update, `libffi` looks for a `/etc/sysconfig/libffi-force-shared-memory-check-first` file and, if it exists, probes for executable memory regardless of if SELinux is enabled. As a result, programs using `libffi` can safely `fork()` without crashing with SELinux enabled.
Clone Of:
: 2152228 (view as bug list)
Environment:
Last Closed: 2023-05-16 09:10:24 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 1977410 1 high CLOSED Python scripts crash with ANOM_ABEND when SELinux is enabled 2023-10-13 12:33:24 UTC
Red Hat Issue Tracker RHELPLAN-101393 0 None None None 2021-11-01 20:20:10 UTC
Red Hat Product Errata RHBA-2023:3014 0 None None None 2023-05-16 09:10:27 UTC

Description Paulo Andrade 2021-10-14 16:23:47 UTC 
This bug was initially created as a copy of Bug #1977410

I am copying this bug because: 



Description of problem:
When SELinux is enabled, even in permissive mode, the attached code crashes.  When SELinux is disabled, it runs fine.  The only message I see in audit.log is:

type=ANOM_ABEND msg=audit(1624551198.965:416): auid=47927 uid=47927 gid=47927 ses=14 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=4090 comm="test.py" reason="memory violation" sig=6

I'm not seeing any AVC messages, even after running "semodule -DB".  I spotted a Bugzilla report (1249685) from a few years back which mentioned python-cffi, the system doesn't have that package installed.  Adjusting the deny_execmem boolean didn't have any effect either - which I'm taking as a good thing, as the warnings about that were sufficiently dire.

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Enable SELinux, in either enforcing or permissive mode.
2. Run attached code.
3. Code crashes.

Actual results:


Expected results:


Additional info:
I have talked with the Red Hat SELinux Userspace team, who have reproduced the issue on Fedora 34 with Python 3.9.  They suspect the issue may be in the Python _ctypes module.
Comment 17 errata-xmlrpc 2023-05-16 09:10:24 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 (libffi 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-2023:3014
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