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Bug 2112014 - Unable to start container with -it and runc
Summary: Unable to start container with -it and runc
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: selinux-policy
Version: 9.0
Hardware: Unspecified
OS: Linux
medium
medium
Target Milestone: rc
: 9.1
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-07-28 15:48 UTC by Joy Pu
Modified: 2022-11-15 12:59 UTC (History)
12 users (show)

Fixed In Version: selinux-policy-34.1.41-1.el9
Doc Type: Bug Fix
Doc Text:
Cause: Missing policy rule to allow unconfined domains to bpf all other domains Consequence: AVC denials Fix: Allow unconfined domains to bpf all other domains Result: No AVC
Clone Of:
Environment:
Last Closed: 2022-11-15 11:14:11 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-129501 0 None None None 2022-07-28 15:55:49 UTC
Red Hat Product Errata RHBA-2022:8283 0 None None None 2022-11-15 11:14:21 UTC

Description Joy Pu 2022-07-28 15:48:55 UTC 
Description of problem:
Update all rpms to the latest and find the it is not able to run a container with runc and with option "-it". It will report:
Error: runc: runc create failed: unable to start container process: error during container init: open /dev/pts/0: operation not permitted: OCI permission denied


Version-Release number of selected component (if applicable):
container-selinux-2.188.0-1.el9_0.noarch
runc-1.1.3-2.el9_0.x86_64
podman-4.1.1-1.el9_0.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Start a container with runc and -it
 # podman --runtime runc run -it quay.io/libpod/alpine:latest top
Error: runc: runc create failed: unable to start container process: error during container init: open /dev/pts/0: operation not permitted: OCI permission denied



Actual results:
Failed to start the container


Expected results:
Container can be start normally


Additional info:

The same command works well with lower version runc(runc-3:1.1.0-2.el9.x86_64)or with selinux disabled.
Comment 1 Joy Pu 2022-07-28 16:07:48 UTC 
Selinux log:
time->Thu Jul 28 12:07:10 2022
type=PROCTITLE msg=audit(1659024430.677:32811): proctitle=2F7573722F62696E2F72756E63002D2D73797374656D642D6367726F7570002D2D6C6F672D666F726D61743D6A736F6E002D2D6C6F67002F72756E2F636F6E7461696E6572732F73746F726167652F6F7665726C61792D636F6E7461696E6572732F646464383635356164363733613939376263616435353531353364626233
type=SYSCALL msg=audit(1659024430.677:32811): arch=c000003e syscall=321 success=no exit=-13 a0=d a1=c00013e040 a2=8 a3=7f4b2cf673b0 items=0 ppid=590627 pid=590628 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=2 comm="runc" exe="/usr/bin/runc" subj=unconfined_u:system_r:container_runtime_t:s0 key=(null)
type=AVC msg=audit(1659024430.677:32811): avc:  denied  { prog_run } for  pid=590628 comm="runc" scontext=unconfined_u:system_r:container_runtime_t:s0 tcontext=system_u:system_r:init_t:s0 tclass=bpf permissive=0
Comment 2 Tom Sweeney 2022-07-28 18:10:47 UTC 
Dan PTAL ASAP
Comment 3 Daniel Walsh 2022-07-28 18:13:30 UTC 
This is a policy that is allowed in Fedora.

$ sesearch -A -s container_runtime_t -t init_t -c bpf
allow unconfined_domain_type domain:bpf { map_create map_read map_write prog_load prog_run };

$ rpm -q selinux-policy
selinux-policy-36.10-1.fc36.noarch

It would seem that the kernel has been updated with new SELinux constraints on prog_run, and the policy was not updated to allow unconfined programs the access.
Comment 6 Zdenek Pytela 2022-08-05 16:54:01 UTC 
Commit to backport:
commit 74e737596525407e600f63c0ba4f4df65d5766cd
Author: Daniel J Walsh <dwalsh>
Date:   Fri Jul 16 06:32:34 2021 -0400

    Allow unconfined domains to bpf all other domains
Comment 16 errata-xmlrpc 2022-11-15 11:14:11 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-2022:8283
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