This is a note to let you know that I've just added the patch titled
crypto: virtio: Fix dest length calculation in __virtio_crypto_skcipher_do_req()
to the 5.6-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-fix-dest-length-calculation-in-__virtio_crypto_skcipher_do_req.patch
and it can be found in the queue-5.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d90ca42012db2863a9a30b564a2ace6016594bda Mon Sep 17 00:00:00 2001
From: "Longpeng(Mike)" <longpeng2@xxxxxxxxxx>
Date: Tue, 2 Jun 2020 15:05:01 +0800
Subject: crypto: virtio: Fix dest length calculation in __virtio_crypto_skcipher_do_req()
From: Longpeng(Mike) <longpeng2@xxxxxxxxxx>
commit d90ca42012db2863a9a30b564a2ace6016594bda upstream.
The src/dst length is not aligned with AES_BLOCK_SIZE(which is 16) in some
testcases in tcrypto.ko.
For example, the src/dst length of one of cts(cbc(aes))'s testcase is 17, the
crypto_virtio driver will set @src_data_len=16 but @dst_data_len=17 in this
case and get a wrong at then end.
SRC: pp pp pp pp pp pp pp pp pp pp pp pp pp pp pp pp pp (17 bytes)
EXP: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc pp (17 bytes)
DST: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 00 (pollute the last bytes)
(pp: plaintext cc:ciphertext)
Fix this issue by limit the length of dest buffer.
Fixes: dbaf0624ffa5 ("crypto: add virtio-crypto driver")
Cc: Gonglei <arei.gonglei@xxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Longpeng(Mike) <longpeng2@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200602070501.2023-4-longpeng2@xxxxxxxxxx
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/crypto/virtio/virtio_crypto_algs.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/crypto/virtio/virtio_crypto_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_algs.c
@@ -402,6 +402,7 @@ __virtio_crypto_skcipher_do_req(struct v
goto free;
}
+ dst_len = min_t(unsigned int, req->cryptlen, dst_len);
pr_debug("virtio_crypto: src_len: %u, dst_len: %llu\n",
req->cryptlen, dst_len);
Patches currently in stable-queue which might be from longpeng2@xxxxxxxxxx are
queue-5.6/crypto-virtio-fix-src-dst-scatterlist-calculation-in-__virtio_crypto_skcipher_do_req.patch
queue-5.6/crypto-virtio-fix-dest-length-calculation-in-__virtio_crypto_skcipher_do_req.patch
queue-5.6/crypto-virtio-fix-use-after-free-in-virtio_crypto_skcipher_finalize_req.patch
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