Bug 2087936 (CVE-2022-1116)

Summary:	CVE-2022-1116 kernel: Integer Overflow or Wraparound vulnerability in io_uring
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bdettelb, bhu, chwhite, crwood, ddepaula, dvlasenk, esandeen, hdegoede, hkrzesin, hpa, jarod, jarodwilson, jburrell, jfaracco, jferlan, jforbes, jglisse, jlelli, jmoyer, joe.lawrence, jonathan, josef, jshortt, jstancek, jwboyer, jwyatt, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, lzampier, masami256, mchehab, nmurray, ptalbert, qzhao, rvrbovsk, scweaver, steved, vkumar, walters, williams
Target Milestone:	---	Keywords:	Reopened, Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-05-25 14:48:28 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2087939, 2089127, 2089128
Bug Blocks:	2087940

Description Guilherme de Almeida Suckevicz 2022-05-18 14:57:41 UTC

Integer Overflow or Wraparound vulnerability in io_uring of Linux Kernel allows local attacker to cause memory corruption and escalate privileges to root. This issue affects: Linux Kernel versions prior to 5.4.189; version 5.4.24 and later versions.

References:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/fs/io_uring.c?h=v5.4.189&id=1a623d361ffe5cecd4244a02f449528416360038
https://kernel.dance/#1a623d361ffe5cecd4244a02f449528416360038

Comment 1 Guilherme de Almeida Suckevicz 2022-05-18 14:59:03 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2087939]

Comment 6 Eric Sandeen 2022-05-24 18:09:19 UTC

The upstream fix is specifically targeted at -stable kernels, fixing a commit that exists only in those forks.

The -stable fix "Fixes:" a custom -stable commit 1a623d361ffe5cecd4244a02f449528416360038, which was intended to mimic ff002b30181d30cdfbca316dadd099c3ca0d739c and 9392a27d88b9707145d713654eb26f0c29789e50 upstream.  I think that commit introduced a flaw unique to -stable (sic) kernels.

I don't /think/ this flaw exists upstream, or in RHEL9.

Jeff, can you help confirm?

Thanks,
-Eric

Comment 7 Jeff Moyer 2022-05-25 02:30:15 UTC

Yes, that looks right to me.  Upstream always put the reference when the request was freed.

Comment 8 Eric Sandeen 2022-05-25 14:48:28 UTC

Thanks Jeff. And I should have noticed that io_uring isn't even /enabled/ for RHEL9:

[sandeen@host rhel-9]$ cat redhat/configs/ark/generic/CONFIG_IO_URING
# CONFIG_IO_URING is not set

so of course this is NOTABUG.

Comment 9 Eric Sandeen 2022-05-25 15:02:54 UTC

Sorry, I meant to close the RHEL9 bug.

Comment 11 Justin M. Forbes 2022-06-29 16:16:52 UTC

This issue was specific to the 5.4 stable tree, releases between 5.4.24 to 5.4.189. Fedora did not ship these kernels.