From: Mathias Krause <minipli@googlemail.com>
Date: Mon, 24 Mar 2014 16:10:38 +0000 (+0100)
Subject: crypto: x86/sha1 - fix stack alignment of AVX2 variant
X-Git-Tag: v3.15-rc1~111^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6c8c17cc7a8806dde074d7c0bf4d519dd4d028c5;p=pandora-kernel.git

crypto: x86/sha1 - fix stack alignment of AVX2 variant

The AVX2 implementation might waste up to a page of stack memory because
of a wrong alignment calculation. This will, in the worst case, increase
the stack usage of sha1_transform_avx2() alone to 5.4 kB -- way to big
for a kernel function. Even worse, it might also allocate *less* bytes
than needed if the stack pointer is already aligned bacause in that case
the 'sub %rbx, %rsp' is effectively moving the stack pointer upwards,
not downwards.

Fix those issues by changing and simplifying the alignment calculation
to use a 32 byte alignment, the alignment really needed.

Cc: Chandramouli Narayanan <mouli@linux.intel.com>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Reviewed-by: H. Peter Anvin <hpa@linux.intel.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---

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