From: Harald Freudenberger <freude@linux.vnet.ibm.com>
Date: Thu, 16 Jan 2014 15:01:11 +0000 (+0100)
Subject: crypto: s390 - fix concurrency issue in aes-ctr mode
X-Git-Tag: v3.2.56~135
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fc211c9a572bba86c7d37c390c6fb3a9ff052f33;p=pandora-kernel.git

crypto: s390 - fix concurrency issue in aes-ctr mode

commit 0519e9ad89e5cd6e6b08398f57c6a71d9580564c upstream.

The aes-ctr mode uses one preallocated page without any concurrency
protection. When multiple threads run aes-ctr encryption or decryption
this can lead to data corruption.

The patch introduces locking for the page and a fallback solution with
slower en/decryption performance in 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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