This is a note to let you know that I've just added the patch titled
crypto: vmx - Fixing GHASH Key issue on little endian
to the 4.1-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-vmx-fixing-ghash-key-issue-on-little-endian.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3c5f0ed78e976be705218cad62acf6a68e9d121e Mon Sep 17 00:00:00 2001
From: Leonidas Da Silva Barbosa <leosilva@xxxxxxxxxxxxxxxxxx>
Date: Fri, 14 Aug 2015 10:14:16 -0300
Subject: crypto: vmx - Fixing GHASH Key issue on little endian
From: Leonidas Da Silva Barbosa <leosilva@xxxxxxxxxxxxxxxxxx>
commit 3c5f0ed78e976be705218cad62acf6a68e9d121e upstream.
GHASH table algorithm is using a big endian key.
In little endian machines key will be LE ordered.
After a lxvd2x instruction key is loaded as it is,
LE/BE order, in first case it'll generate a wrong
table resulting in wrong hashes from the algorithm.
Bug affects only LE machines.
In order to fix it we do a swap for loaded key.
Signed-off-by: Leonidas S Barbosa <leosilva@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/crypto/vmx/ghashp8-ppc.pl | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/crypto/vmx/ghashp8-ppc.pl
+++ b/drivers/crypto/vmx/ghashp8-ppc.pl
@@ -61,6 +61,12 @@ $code=<<___;
mtspr 256,r0
li r10,0x30
lvx_u $H,0,r4 # load H
+ le?xor r7,r7,r7
+ le?addi r7,r7,0x8 # need a vperm start with 08
+ le?lvsr 5,0,r7
+ le?vspltisb 6,0x0f
+ le?vxor 5,5,6 # set a b-endian mask
+ le?vperm $H,$H,$H,5
vspltisb $xC2,-16 # 0xf0
vspltisb $t0,1 # one
Patches currently in stable-queue which might be from leosilva@xxxxxxxxxxxxxxxxxx are
queue-4.1/crypto-vmx-fixing-ghash-key-issue-on-little-endian.patch
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