This is a note to let you know that I've just added the patch titled
crypto: aesni-intel - fix unaligned cbc decrypt for x86-32
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
crypto-aesni-intel-fix-unaligned-cbc-decrypt-for-x86-32.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 7c8d51848a88aafdb68f42b6b650c83485ea2f84 Mon Sep 17 00:00:00 2001
From: Mathias Krause <mini...@googlemail.com>
Date: Wed, 30 May 2012 01:43:08 +0200
Subject: crypto: aesni-intel - fix unaligned cbc decrypt for x86-32
From: Mathias Krause <mini...@googlemail.com>
commit 7c8d51848a88aafdb68f42b6b650c83485ea2f84 upstream.
The 32 bit variant of cbc(aes) decrypt is using instructions requiring
128 bit aligned memory locations but fails to ensure this constraint in
the code. Fix this by loading the data into intermediate registers with
load unaligned instructions.
This fixes reported general protection faults related to aesni.
References: https://bugzilla.kernel.org/show_bug.cgi?id=43223
Reported-by: Daniel <gark...@mailueberfall.de>
Signed-off-by: Mathias Krause <mini...@googlemail.com>
Signed-off-by: Herbert Xu <herb...@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/x86/crypto/aesni-intel_asm.S | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/arch/x86/crypto/aesni-intel_asm.S
+++ b/arch/x86/crypto/aesni-intel_asm.S
@@ -2460,10 +2460,12 @@ ENTRY(aesni_cbc_dec)
pxor IN3, STATE4
movaps IN4, IV
#else
- pxor (INP), STATE2
- pxor 0x10(INP), STATE3
pxor IN1, STATE4
movaps IN2, IV
+ movups (INP), IN1
+ pxor IN1, STATE2
+ movups 0x10(INP), IN2
+ pxor IN2, STATE3
#endif
movups STATE1, (OUTP)
movups STATE2, 0x10(OUTP)
Patches currently in stable-queue which might be from mini...@googlemail.com are
queue-3.4/crypto-aesni-intel-fix-unaligned-cbc-decrypt-for-x86-32.patch
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