Patch "crypto: virtio - implement missing support for output IVs" has been added to the 5.4-stable tree

Patch "crypto: virtio - implement missing support for output IVs" has been added to the 5.4-stable tree

[gregkh]

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

    crypto: virtio - implement missing support for output IVs

to the 5.4-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-virtio-implement-missing-support-for-output-ivs.patch
and it can be found in the queue-5.4 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 500e6807ce93b1fdc7d5b827c5cc167cc35630db Mon Sep 17 00:00:00 2001
From: Ard Biesheuvel <ardb@kernel.org>
Date: Sat, 9 Nov 2019 18:09:26 +0100
Subject: crypto: virtio - implement missing support for output IVs

From: Ard Biesheuvel <ardb@kernel.org>

commit 500e6807ce93b1fdc7d5b827c5cc167cc35630db upstream.

In order to allow for CBC to be chained, which is something that the
CTS template relies upon, implementations of CBC need to pass the
IV to be used for subsequent invocations via the IV buffer. This was
not implemented yet for virtio-crypto so implement it now.

Fixes: dbaf0624ffa5 ("crypto: add virtio-crypto driver")
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Gonglei <arei.gonglei@huawei.com>
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/crypto/virtio/virtio_crypto_algs.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/crypto/virtio/virtio_crypto_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_algs.c
@@ -435,6 +435,11 @@ __virtio_crypto_ablkcipher_do_req(struct
 		goto free;
 	}
 	memcpy(iv, req->info, ivsize);
+	if (!vc_sym_req->encrypt)
+		scatterwalk_map_and_copy(req->info, req->src,
+					 req->nbytes - AES_BLOCK_SIZE,
+					 AES_BLOCK_SIZE, 0);
+
 	sg_init_one(&iv_sg, iv, ivsize);
 	sgs[num_out++] = &iv_sg;
 	vc_sym_req->iv = iv;
@@ -571,6 +576,10 @@ static void virtio_crypto_ablkcipher_fin
 	struct ablkcipher_request *req,
 	int err)
 {
+	if (vc_sym_req->encrypt)
+		scatterwalk_map_and_copy(req->info, req->dst,
+					 req->nbytes - AES_BLOCK_SIZE,
+					 AES_BLOCK_SIZE, 0);
 	crypto_finalize_ablkcipher_request(vc_sym_req->base.dataq->engine,
 					   req, err);
 	kzfree(vc_sym_req->iv);


Patches currently in stable-queue which might be from ardb@kernel.org are

queue-5.4/crypto-virtio-implement-missing-support-for-output-ivs.patch