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Bug 2187745

Summary:	io_uring requires mmap() of anonymous inodes
Product:	Red Hat Enterprise Linux 9	Reporter:	Jeff Moyer <jmoyer>
Component:	selinux-policy	Assignee:	Zdenek Pytela <zpytela>
Status:	CLOSED ERRATA	QA Contact:	Milos Malik <mmalik>
Severity:	medium	Docs Contact:	Petr Hybl <phybl>
Priority:	medium
Version:	9.3	CC:	lvrabec, mmalik, phybl, zpytela
Target Milestone:	rc	Keywords:	Reopened, Triaged
Target Release:	---	Flags:	pm-rhel: mirror+
Hardware:	Unspecified
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	.`io_uring` now works without SELinux denials Previously, the `io_uring` kernel interface missed the `map` permission in the SELinux policy. Consequently, the `mmap` system call failed and the `io_uring` interface did not work properly. With this update, the `map` permissions have been allowed in SELinux policy and the interface now works without SELinux denials.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-11-07 08:52:21 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Jeff Moyer 2023-04-18 15:15:32 UTC

Description of problem:
We are enabling io_uring in RHEL 9.3 (see bug 2068237).  By default, our selinux policy is preventing io_uring applications from working.  Here is a snippet from the audit log:

type=AVC msg=audit(1681827274.832:197): avc:  denied  { map } for  pid=27074 comm="iopoll-leak.t" path="anon_inode:[io_uring]" dev="anon_inodefs" ino=64058 scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:unconfined_t:s0 tclass=anon_inode permissive=0

How do you recommend we address this?

Version-Release number of selected component (if applicable):
rhel-9.3.0

How reproducible:
100%

Steps to Reproduce:
1. Run an application that makes use of io_uring.  This could be fio, fio's t/io_uring, or the liburing test suite.

Additional info:

Note that io_uring will be disabled by default.  You can find the current proposed code here:
  https://gitlab.com/redhat/centos-stream/src/kernel/centos-stream-9/-/merge_requests/2375#note_1356018369

I would be happy to test any patches or updated packages.

Thanks!

Comment 1 Zdenek Pytela 2023-04-18 15:26:40 UTC

Should be as easy as backporting
34264caf2 Add the map permission to common_anon_inode_perm permission set

unless there were other interfering changes in Fedora in the meantime.

Comment 15 errata-xmlrpc 2023-11-07 08:52:21 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-2023:6617

Comment 17 Red Hat Bugzilla 2024-03-13 04:25:03 UTC

The needinfo request[s] on this closed bug have been removed as they have been unresolved for 120 days