395711 – kernel: tight loop and no preemption can cause system stall (CVE-2011-4621)

Bug 395711 - kernel: tight loop and no preemption can cause system stall (CVE-2011-4621)

Summary: kernel: tight loop and no preemption can cause system stall (CVE-2011-4621)

Status:	RESOLVED FIXED

Alias:	None

Product:	Gentoo Security
Classification:	Unclassified
Component:	Kernel (show other bugs)
Hardware:	All Linux

Importance:	Normal normal
Assignee:	Gentoo Kernel Security

URL:	https://bugzilla.redhat.com/show_bug....
Whiteboard:
Keywords:

Depends on:
Blocks:

Reported:	2011-12-22 19:16 UTC by Michael Harrison
Modified:	2018-04-04 17:47 UTC (History)
CC List:	1 user (show)

See Also:
Package list:
Runtime testing required:	---

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Description Michael Harrison 2011-12-22 19:16:12 UTC

A tight loop in user level process isn't preempted unless a realtime process is
woken up on the cpu.  Some important kernel threads such as events/*, kblockd/*
can be blocked by the process, and the machine stalls.

Unprivileged local user could use this flaw to DoS the system.

Upstream commit:
f26f9aff6aaf67e9a430d16c266f91b13a5bff64

Reference:
https://lkml.org/lkml/2010/11/20/212

Comment 1 Aaron Bauman (RETIRED) gentoo-dev

2018-04-04 17:47:02 UTC

There are no longer any 2.x kernels available in the repository with the exception of sys-kernel/xbox-sources which is unsupported by security.