[tip:x86/vdso] x86-64: Add CONFIG_UNSAFE_VSYSCALLS to feature-removal-schedule

[tip-bot for Andy Lutomirski <luto@mit.edu>]

Commit-ID:  38172403a97828ae2ea12281b19528582d6625d4
Gitweb:     http://git.kernel.org/tip/38172403a97828ae2ea12281b19528582d6625d4
Author:     Andy Lutomirski <luto@mit.edu>
AuthorDate: Sun, 5 Jun 2011 13:50:25 -0400
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Mon, 6 Jun 2011 09:43:15 +0200

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@mit.edu>
Cc: Jesper Juhl <jj@chaosbits.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Jan Beulich <JBeulich@novell.com>
Cc: richard -rw- weinberger <richard.weinberger@gmail.com>
Cc: Mikael Pettersson <mikpe@it.uu.se>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Louis Rilling <Louis.Rilling@kerlabs.com>
Cc: Valdis.Kletnieks@vt.edu
Cc: pageexec@freemail.hu
Link: http://lkml.kernel.org/r/4de62bfbf6974f14d0e9d9ae37cc137dbc926a30.1307292171.git.luto@mit.edu
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 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@@ -600,3 +600,12 @@ Why:	Superseded by the UVCIOC_CTRL_QUERY ioctl.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@ideasonboard.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@mit.edu>
+
+----------------------------