linux-kernel - [PATCH v5 9/9] x86-64: Add CONFIG_UNSAFE_VSYSCALLS to feature-removal-schedule

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Message-Id: <4de62bfbf6974f14d0e9d9ae37cc137dbc926a30.1307292171.git.luto@mit.edu>
Date:	Sun,  5 Jun 2011 13:50:25 -0400
From:	Andy Lutomirski <luto@....EDU>
To:	Ingo Molnar <mingo@...e.hu>, x86@...nel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
	Jesper Juhl <jj@...osbits.net>, Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Jan Beulich <JBeulich@...ell.com>,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	Mikael Pettersson <mikpe@...uu.se>,
	Andi Kleen <andi@...stfloor.org>,
	Brian Gerst <brgerst@...il.com>,
	Louis Rilling <Louis.Rilling@...labs.com>,
	Valdis.Kletnieks@...edu, pageexec@...email.hu,
	Andy Lutomirski <luto@....edu>
Subject: [PATCH v5 9/9] x86-64: Add CONFIG_UNSAFE_VSYSCALLS to feature-removal-schedule

CONFIG_UNSAFE_VSYSCALLS was added in the previous patch as a
temporary hack to avoid penalizing users who don't build glibc from
git.

Signed-off-by: Andy Lutomirski <luto@....edu>
---
 Documentation/feature-removal-schedule.txt |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 1a9446b..94b4470 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -600,3 +600,12 @@ Why:	Superseded by the UVCIOC_CTRL_QUERY ioctl.
 Who:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
 
 ----------------------------
+
+What:	CONFIG_UNSAFE_VSYSCALLS (x86_64)
+When:	When glibc 2.14 or newer is ubitquitous.  Perhaps mid-2012.
+Why:	Having user-executable code at a fixed address is a security problem.
+	Turning off CONFIG_UNSAFE_VSYSCALLS mostly removes the risk but will
+	make the time() function slower on glibc versions 2.13 and below.
+Who:	Andy Lutomirski <luto@....edu>
+
+----------------------------
-- 
1.7.5.2

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