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Bug 1783957

Summary:	Implement workaround in assembler for Intel's JCC errata [RHEL 8.2] [rhel-8.1.0.z]
Product:	Red Hat Enterprise Linux 8	Reporter:	RHEL Program Management Team <pgm-rhel-tools>
Component:	binutils	Assignee:	Nick Clifton <nickc>
binutils sub component:	system-version	QA Contact:	Martin Cermak <mcermak>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	high
Priority:	unspecified	CC:	dbayly, fweimer, law, mcermak, mprchlik, ohudlick, pfrankli, toneata
Version:	8.2	Keywords:	ZStream
Target Milestone:	rc	Flags:	pm-rhel: mirror+
Target Release:	8.0
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	binutils-2.30-58.el8_1_0.1	Doc Type:	Bug Fix
Doc Text:	Cause: A recently discovered problem in some Intel CPUs means that under certain circumstances it is possible for a machine instruction to be executed incorrectly. Consequence: A CPU with the flaw could fail to execute programs correctly. Fix: The full fix involves updating the microcode of vulnerable CPUs, which can result in a performance degradation. This update enables a workaround in the assembler instead. Recompiling a program with the workaround enabled will render a program immune to the vulnerability, although there will be a size increase and possibly a small performance hit. Note - the workaround is not enabled by default. In order to activate it this gcc command line option must be used: -Wa,-mbranches-within-32B-boundaries Result: Programs rebuilt with the above command line option specified will not be vulnerable to the Intel Jcc flaw.	Story Points:	---
Clone Of:	1777002	Environment:
Last Closed:	2020-02-04 13:11:48 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:	1777002
Bug Blocks:

Comment 1 Nick Clifton 2019-12-16 13:18:49 UTC

Fixed in binutils-2.30-58.el8_1_0.1

Comment 5 errata-xmlrpc 2020-02-04 13:11:48 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, 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-2020:0338