tree 14232912769ade751a61a61984bf1aaf2dc2fb24
parent adc3fcf1552b6e406d172fd9690bbd1395053d13
author Harald Freudenberger <freude@linux.vnet.ibm.com> 1390392093 +0100
committer Herbert Xu <herbert@gondor.apana.org.au> 1391089514 +0800

crypto: s390 - fix des and des3_ede ctr concurrency issue

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.

Cc: stable@vger.kernel.org
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>