bybrooklyn/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-04-18 14:53:58 -04:00
Code Issues Packages Projects Releases Wiki Activity

virtio-crypto: use private buffer for control request

Browse Source 
Originally, all of the control requests share a single buffer(
ctrl & input & ctrl_status fields in struct virtio_crypto), this
allows queue depth 1 only, the performance of control queue gets
limited by this design.

In this patch, each request allocates request buffer dynamically, and
free buffer after request, so the scope protected by ctrl_lock also
get optimized here.
It's possible to optimize control queue depth in the next step.

A necessary comment is already in code, still describe it again:
/*
 * Note: there are padding fields in request, clear them to zero before
 * sending to host to avoid to divulge any information.
 * Ex, virtio_crypto_ctrl_request::ctrl::u::destroy_session::padding[48]
 */
So use kzalloc to allocate buffer of struct virtio_crypto_ctrl_request.

Potentially dereferencing uninitialized variables:
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20220506131627.180784-3-pizhenwei@bytedance.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
zhenwei pi
2022-05-06 21:16:24 +08:00
committed by Michael S. Tsirkin
parent 6fd763d155
commit 0756ad15b1
3 changed files with 79 additions and 45 deletions
Download Patch File Download Diff File Expand all files Collapse all files

57
drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
View File

@@ -108,16 +108,22 @@ static int virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher
unsigned int num_out = 0, num_in = 0;
struct virtio_crypto_op_ctrl_req *ctrl;
struct virtio_crypto_session_input *input;
struct virtio_crypto_ctrl_request *vc_ctrl_req;
pkey = kmemdup(key, keylen, GFP_ATOMIC);
if (!pkey)
return -ENOMEM;
spin_lock(&vcrypto->ctrl_lock);
ctrl = &vcrypto->ctrl;
vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
if (!vc_ctrl_req) {
err = -ENOMEM;
goto out;
}
ctrl = &vc_ctrl_req->ctrl;
memcpy(&ctrl->header, header, sizeof(ctrl->header));
memcpy(&ctrl->u, para, sizeof(ctrl->u));
input = &vcrypto->input;
input = &vc_ctrl_req->input;
input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
sg_init_one(&outhdr_sg, ctrl, sizeof(*ctrl));
@@ -129,16 +135,22 @@ static int virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher
sg_init_one(&inhdr_sg, input, sizeof(*input));
sgs[num_out + num_in++] = &inhdr_sg;
spin_lock(&vcrypto->ctrl_lock);
err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto, GFP_ATOMIC);
if (err < 0)
if (err < 0) {
spin_unlock(&vcrypto->ctrl_lock);
goto out;
}
virtqueue_kick(vcrypto->ctrl_vq);
while (!virtqueue_get_buf(vcrypto->ctrl_vq, &inlen) &&
!virtqueue_is_broken(vcrypto->ctrl_vq))
cpu_relax();
spin_unlock(&vcrypto->ctrl_lock);
if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
pr_err("virtio_crypto: Create session failed status: %u\n",
le32_to_cpu(input->status));
err = -EINVAL;
goto out;
}
@@ -148,13 +160,9 @@ static int virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher
err = 0;
out:
spin_unlock(&vcrypto->ctrl_lock);
kfree(vc_ctrl_req);
kfree_sensitive(pkey);
if (err < 0)
pr_err("virtio_crypto: Create session failed status: %u\n",
le32_to_cpu(input->status));
return err;
}
@@ -167,15 +175,18 @@ static int virtio_crypto_alg_akcipher_close_session(struct virtio_crypto_akciphe
int err;
struct virtio_crypto_op_ctrl_req *ctrl;
struct virtio_crypto_inhdr *ctrl_status;
struct virtio_crypto_ctrl_request *vc_ctrl_req;
spin_lock(&vcrypto->ctrl_lock);
if (!ctx->session_valid) {
err = 0;
goto out;
}
ctrl_status = &vcrypto->ctrl_status;
if (!ctx->session_valid)
return 0;
vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
if (!vc_ctrl_req)
return -ENOMEM;
ctrl_status = &vc_ctrl_req->ctrl_status;
ctrl_status->status = VIRTIO_CRYPTO_ERR;
ctrl = &vcrypto->ctrl;
ctrl = &vc_ctrl_req->ctrl;
ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_DESTROY_SESSION);
ctrl->header.queue_id = 0;
@@ -188,16 +199,22 @@ static int virtio_crypto_alg_akcipher_close_session(struct virtio_crypto_akciphe
sg_init_one(&inhdr_sg, &ctrl_status->status, sizeof(ctrl_status->status));
sgs[num_out + num_in++] = &inhdr_sg;
spin_lock(&vcrypto->ctrl_lock);
err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto, GFP_ATOMIC);
if (err < 0)
if (err < 0) {
spin_unlock(&vcrypto->ctrl_lock);
goto out;
}
virtqueue_kick(vcrypto->ctrl_vq);
while (!virtqueue_get_buf(vcrypto->ctrl_vq, &inlen) &&
!virtqueue_is_broken(vcrypto->ctrl_vq))
cpu_relax();
spin_unlock(&vcrypto->ctrl_lock);
if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
ctrl_status->status, destroy_session->session_id);
err = -EINVAL;
goto out;
}
@@ -206,11 +223,7 @@ static int virtio_crypto_alg_akcipher_close_session(struct virtio_crypto_akciphe
ctx->session_valid = false;
out:
spin_unlock(&vcrypto->ctrl_lock);
if (err < 0) {
pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n",
ctrl_status->status, destroy_session->session_id);
}
kfree(vc_ctrl_req);
return err;
}