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Bug 822300

Summary:	kernel: x86-64: Rework vsyscall emulation and add vsyscall= parameter [rhel-5.9]
Product:	Red Hat Enterprise Linux 5	Reporter:	Eugene Teo (Security Response) <eteo>
Component:	kernel	Assignee:	Alexander Gordeev <agordeev>
Status:	CLOSED WONTFIX	QA Contact:	Red Hat Kernel QE team <kernel-qe>
Severity:	high	Docs Contact:
Priority:	high
Version:	5.9	CC:	anton, dhoward, jarod, lwang, pmatouse, security-response-team, sforsber
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:
Clones:	822301 822302 (view as bug list)		Environment:
Last Closed:	2013-05-22 13:00:03 UTC	Type:	Bug
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:	921920
Bug Blocks:	822292, 822301, 822302

Description Eugene Teo (Security Response) 2012-05-17 01:18:16 UTC

Description of problem:
There are three choices:
vsyscall=native: Vsyscalls are native code that issues the corresponding syscalls.

vsyscall=emulate (default): Vsyscalls are emulated by instruction fault traps, tested in the bad_area path.  The actual contents of the vsyscall page is the same as the vsyscall=native case except that it's marked NX.  This way programs that make assumptions about what the code in the page does will not be confused when they read that code.

vsyscall=none: Trying to execute a vsyscall will segfault.

Signed-off-by: Andy Lutomirski <luto>
Link: http://lkml.kernel.org/r/8449fb3abf89851fd6b2260972666a6f82542284.1312988155.git.luto@mit.edu
Signed-off-by: H. Peter Anvin <hpa.com>

Upstream commit:
http://git.kernel.org/linus/3ae36655

Comment 2 RHEL Program Management 2012-12-08 06:47:13 UTC

This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

Comment 11 RHEL Program Management 2013-05-22 13:00:03 UTC

Development Management has reviewed and declined this request.
You may appeal this decision by reopening this request.