linux-kernel - [PATCH v6 4/5] virtio-crypto: adjust dst

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220506131627.180784-5-pizhenwei@bytedance.com>
Date:   Fri,  6 May 2022 21:16:26 +0800
From:   zhenwei pi <pizhenwei@...edance.com>
To:     arei.gonglei@...wei.com, mst@...hat.com
Cc:     jasowang@...hat.com, herbert@...dor.apana.org.au,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-crypto@...r.kernel.org, helei.sig11@...edance.com,
        pizhenwei@...edance.com, davem@...emloft.net
Subject: [PATCH v6 4/5] virtio-crypto: adjust dst_len at ops callback

From: lei he <helei.sig11@...edance.com>

For some akcipher operations(eg, decryption of pkcs1pad(rsa)),
the length of returned result maybe less than akcipher_req->dst_len,
we need to recalculate the actual dst_len through the virt-queue
protocol.

Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: Jason Wang <jasowang@...hat.com>
Cc: Gonglei <arei.gonglei@...wei.com>
Reviewed-by: Gonglei <arei.gonglei@...wei.com>
Signed-off-by: lei he <helei.sig11@...edance.com>
Signed-off-by: zhenwei pi <pizhenwei@...edance.com>
---
 drivers/crypto/virtio/virtio_crypto_akcipher_algs.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
index 382ccec9ab12..2a60d0525cde 100644
--- a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
@@ -90,9 +90,12 @@ static void virtio_crypto_dataq_akcipher_callback(struct virtio_crypto_request *
 	}
 
 	akcipher_req = vc_akcipher_req->akcipher_req;
-	if (vc_akcipher_req->opcode != VIRTIO_CRYPTO_AKCIPHER_VERIFY)
+	if (vc_akcipher_req->opcode != VIRTIO_CRYPTO_AKCIPHER_VERIFY) {
+		/* actuall length maybe less than dst buffer */
+		akcipher_req->dst_len = len - sizeof(vc_req->status);
 		sg_copy_from_buffer(akcipher_req->dst, sg_nents(akcipher_req->dst),
 				    vc_akcipher_req->dst_buf, akcipher_req->dst_len);
+	}
 	virtio_crypto_akcipher_finalize_req(vc_akcipher_req, akcipher_req, error);
 }
 
-- 
2.20.1