linux-kernel - [PATCH 4/4] Add vsyscalls to feature-removal-schedule.txt

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Message-Id: <066852f3f344c1733e0db9a2427981ea1815db7d.1312899174.git.luto@mit.edu>
Date:	Tue,  9 Aug 2011 10:27:50 -0400
From:	Andy Lutomirski <luto@....EDU>
To:	x86@...nel.org
Cc:	Andy Lutomirski <luto@....edu>, "H. Peter Anvin" <hpa@...or.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, lueckintel@...oo.com,
	kimwooyoung@...il.com, Ingo Molnar <mingo@...e.hu>,
	Borislav Petkov <bp@...en8.de>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: [PATCH 4/4] Add vsyscalls to feature-removal-schedule.txt

In a couple years, we'll see how well we've done at eradicating vsyscall-using
binaries.  Hopefully we can then disable them by default.  We will probably
have to leave the option to enable them around forever.

Signed-off-by: Andy Lutomirski <luto@....edu>
---
 Documentation/feature-removal-schedule.txt |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 43f4809..981562f 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -575,6 +575,20 @@ Who:	Hans Verkuil <hans.verkuil@...co.com>
 
 ----------------------------
 
+What:	vsyscalls may go away by default
+When:	3.6
+Why:	All vsyscall functionality is available as regular syscalls and through
+	the vDSO.  Vsyscalls are currently emulated and are slower than normal
+	syscalls.  Userspace exploits can still use the emulated vsyscall traps
+	as a form of 'ret' instruction.
+	
+	In the mean time, do *not* rely on the semantics of int 0x40, int 0x41,
+	and int 0x42.  They may change or go away completely with no notice.
+	Any attempt to use them will result in a warning in the kernel log.
+Who:	Andy Lutomirski <luto@....edu>
+
+----------------------------
+
 What:	g_file_storage driver
 When:	3.8
 Why:	This driver has been superseded by g_mass_storage.
-- 
1.7.6

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