Bug 2049708

Summary:	CVE-2022-0480 kernel: memcg does not limit the number of POSIX file locks allowing memory exhaustion [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	35	CC:	acaringi, adscvr, airlied, alciregi, bskeggs, hdegoede, jarodwilson, jeremy, jforbes, jglisse, jonathan, josef, jwboyer, kernel-maint, lgoncalv, linville, masami256, mchehab, ptalbert, rkeshri, steved
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2022-02-10 22:03:52 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:
Bug Blocks:	2049700

Description Guilherme de Almeida Suckevicz 2022-02-02 15:00:48 UTC

This is an automatically created tracking bug!  It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.

For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.

For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs

When submitting as an update, use the fedpkg template provided in the next
comment(s).  This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.

Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.

NOTE: this issue affects multiple supported versions of Fedora. While only
one tracking bug has been filed, please correct all affected versions at
the same time.  If you need to fix the versions independent of each other,
you may clone this bug as appropriate.

Reproducers, if any, will remain confidential and never be made public, unless done so by the security team.

Comment 1 Guilherme de Almeida Suckevicz 2022-02-02 15:00:51 UTC

Use the following template to for the 'fedpkg update' request to submit an
update for this issue as it contains the top-level parent bug(s) as well as
this tracking bug.  This will ensure that all associated bugs get updated
when new packages are pushed to stable.

=====

# bugfix, security, enhancement, newpackage (required)
type=security

# low, medium, high, urgent (required)
severity=medium

# testing, stable
request=testing

# Bug numbers: 1234,9876
bugs=2049700,2049708

# Description of your update
notes=Security fix for [PUT CVEs HERE]

# Enable request automation based on the stable/unstable karma thresholds
autokarma=True
stable_karma=3
unstable_karma=-3

# Automatically close bugs when this marked as stable
close_bugs=True

# Suggest that users restart after update
suggest_reboot=False

======

Additionally, you may opt to use the bodhi web interface to submit updates:

https://bodhi.fedoraproject.org/updates/new

Comment 2 Justin M. Forbes 2022-02-10 22:03:52 UTC

This was fixed for Fedora with the 5.15.x stable kernel rebases.

Comment 3 Rohit Keshri 2022-03-20 18:37:44 UTC

This fix is reverted.

~~~
commit 3754707bcc3e190e5dadc978d172b61e809cb3bd
Author: Linus Torvalds <torvalds>
Date:   Tue Sep 7 11:21:48 2021 -0700

    Revert "memcg: enable accounting for file lock caches"
    
    This reverts commit 0f12156dff2862ac54235fc72703f18770769042.
    
    The kernel test robot reports a sizeable performance regression for this
    commit, and while it clearly does the rigth thing in theory, we'll need
    to look at just how to avoid or minimize the performance overhead of the
    memcg accounting.
    
    People already have suggestions on how to do that, but it's "future
    work".
    
    So revert it for now.
    
    Link: https://lore.kernel.org/lkml/20210907150757.GE17617@xsang-OptiPlex-9020/
    Acked-by: Jens Axboe <axboe>
    Acked-by: Shakeel Butt <shakeelb>
    Acked-by: Roman Gushchin <guro>
    Cc: Tejun Heo <tj>
    Signed-off-by: Linus Torvalds <torvalds>
~~~