Bug 2158222

Summary:	kernel: hugepage bug: bad page state in process bash
Product:	[Other] Security Response	Reporter:	Alex <allarkin>
Component:	vulnerability	Assignee:	Nobody <nobody>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	acaringi, allarkin, bhu, chwhite, crecklin, dbohanno, ddepaula, debarbos, dfreiber, dvlasenk, ezulian, fhrbata, hkrzesin, jarod, jburrell, jdenham, jfaracco, jferlan, jforbes, jlelli, joe.lawrence, jshortt, jstancek, jwyatt, kcarcia, kernel-mgr, ldoskova, lgoncalv, lleshchi, lzampier, nmurray, ptalbert, qzhao, rogbas, rrobaina, rvrbovsk, rysulliv, scweaver, swood, tyberry, vcowan, vkumar, walters, wcosta, williams, wmealing, ycote
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the Linux kernels hugepages management. When dynamically allocate and free 1G hugepage through /proc/sys/vm/nr_hugepages, it can lead to a system crash.	Story Points:	---
Clone Of:		Environment:
Last Closed:		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:	2158225, 2158226, 2158227, 2193106
Bug Blocks:	2152486

Description Alex 2023-01-04 17:26:40 UTC

A flaw found in the Linux Kernel hugepages management.
The issue actual for Red Hat kernels before 442 build (like kernel-4.18.0-441.el8).

Steps to Reproduce:
1.grubby --args "default_hugepagesz=1G" --update-kernel DEFAULT
2.reboot
3.echo 1 > /proc/sys/vm/nr_hugepages
4.echo 0 > /proc/sys/vm/nr_hugepages

Reference:
https://bugzilla.redhat.com/show_bug.cgi?id=2151884

Comment 11 Alex 2023-05-04 11:01:03 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2193106]