From: Harald Freudenberger <freude@linux.vnet.ibm.com>
Date: Wed, 22 Jan 2014 12:01:33 +0000 (+0100)
Subject: crypto: s390 - fix des and des3_ede ctr concurrency issue
X-Git-Tag: v3.2.56~133
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=60745e70f4b4725a1ae9387af914de0d25470491;p=pandora-kernel.git

crypto: s390 - fix des and des3_ede ctr concurrency issue

commit ee97dc7db4cbda33e4241c2d85b42d1835bc8a35 upstream.

In s390 des and 3des ctr mode there is one preallocated page
used to speed up the en/decryption. This page is not protected
against concurrent usage and thus there is a potential of data
corruption with multiple threads.

The fix introduces locking/unlocking the ctr page and a slower
fallback solution at concurrency situations.

Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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