RE: [PATCH v5 4/5] virtio-crypto: adjust dst_len at ops callback

Fri, 06 May 2022 02:28:17 -0700 


> -----Original Message-----
> From: zhenwei pi [mailto:[email protected]]
> Sent: Thursday, May 5, 2022 5:24 PM
> To: Gonglei (Arei) <[email protected]>; [email protected]
> Cc: [email protected]; [email protected];
> [email protected]; [email protected];
> [email protected]; [email protected];
> [email protected]; [email protected]
> Subject: [PATCH v5 4/5] virtio-crypto: adjust dst_len at ops callback
> 
> From: lei he <[email protected]>
> 
> 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 <[email protected]>
> Cc: Jason Wang <[email protected]>
> Cc: Gonglei <[email protected]>
> Signed-off-by: lei he <[email protected]>
> Signed-off-by: zhenwei pi <[email protected]>
> ---
>  drivers/crypto/virtio/virtio_crypto_akcipher_algs.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 

Reviewed-by: Gonglei <[email protected]>

Regards,
-Gonglei


> 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

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