Patch "crypto: caam - fix AEAD givenc descriptors" has been added to the 4.8-stable tree

Patch "crypto: caam - fix AEAD givenc descriptors" has been added to the 4.8-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    crypto: caam - fix AEAD givenc descriptors

to the 4.8-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-caam-fix-aead-givenc-descriptors.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d128af17876d79b87edf048303f98b35f6a53dbc Mon Sep 17 00:00:00 2001
From: Alex Porosanu <alexandru.porosanu@nxp.com>
Date: Wed, 9 Nov 2016 10:46:11 +0200
Subject: crypto: caam - fix AEAD givenc descriptors
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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From: Alex Porosanu <alexandru.porosanu@nxp.com>

commit d128af17876d79b87edf048303f98b35f6a53dbc upstream.

The AEAD givenc descriptor relies on moving the IV through the
output FIFO and then back to the CTX2 for authentication. The
SEQ FIFO STORE could be scheduled before the data can be
read from OFIFO, especially since the SEQ FIFO LOAD needs
to wait for the SEQ FIFO LOAD SKIP to finish first. The
SKIP takes more time when the input is SG than when it's
a contiguous buffer. If the SEQ FIFO LOAD is not scheduled
before the STORE, the DECO will hang waiting for data
to be available in the OFIFO so it can be transferred to C2.
In order to overcome this, first force transfer of IV to C2
by starting the "cryptlen" transfer first and then starting to
store data from OFIFO to the output buffer.

Fixes: 1acebad3d8db8 ("crypto: caam - faster aead implementation")
Signed-off-by: Alex Porosanu <alexandru.porosanu@nxp.com>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/crypto/caam/caamalg.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/crypto/caam/caamalg.c
+++ b/drivers/crypto/caam/caamalg.c
@@ -702,7 +702,9 @@ copy_iv:
 
 	/* Will read cryptlen */
 	append_math_add(desc, VARSEQINLEN, SEQINLEN, REG0, CAAM_CMD_SZ);
-	aead_append_src_dst(desc, FIFOLD_TYPE_MSG1OUT2);
+	append_seq_fifo_load(desc, 0, FIFOLD_CLASS_BOTH | KEY_VLF |
+			     FIFOLD_TYPE_MSG1OUT2 | FIFOLD_TYPE_LASTBOTH);
+	append_seq_fifo_store(desc, 0, FIFOST_TYPE_MESSAGE_DATA | KEY_VLF);
 
 	/* Write ICV */
 	append_seq_store(desc, ctx->authsize, LDST_CLASS_2_CCB |


Patches currently in stable-queue which might be from alexandru.porosanu@nxp.com are

queue-4.8/crypto-caam-fix-aead-givenc-descriptors.patch