mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
d6d46be1bf
qemu/hw/virtio/virtio-crypto.c
Philippe Mathieu-Daudé f4729ec39a hw/virtio/virtio-crypto: Protect from DMA re-entrancy bugs 
Replace qemu_bh_new_guarded() by virtio_bh_new_guarded()
so the bus and device use the same guard. Otherwise the
DMA-reentrancy protection can be bypassed.

Fixes: CVE-2024-3446
Cc: qemu-stable@nongnu.org
Suggested-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20240409105537.18308-5-philmd@linaro.org>
2024-04-10 09:09:33 +02:00

1300 lines
42 KiB
C
Raw Blame History

/*
* Virtio crypto Support
*
* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
*
* Authors:
* Gonglei <arei.gonglei@huawei.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* (at your option) any later version. See the COPYING file in the
* top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/iov.h"
#include "qemu/main-loop.h"
#include "qemu/module.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "hw/virtio/virtio.h"
#include "hw/virtio/virtio-crypto.h"
#include "hw/qdev-properties.h"
#include "standard-headers/linux/virtio_ids.h"
#include "sysemu/cryptodev-vhost.h"
#define VIRTIO_CRYPTO_VM_VERSION 1
typedef struct VirtIOCryptoSessionReq {
VirtIODevice *vdev;
VirtQueue *vq;
VirtQueueElement *elem;
CryptoDevBackendSessionInfo info;
CryptoDevCompletionFunc cb;
} VirtIOCryptoSessionReq;
static void virtio_crypto_free_create_session_req(VirtIOCryptoSessionReq *sreq)
{
switch (sreq->info.op_code) {
case VIRTIO_CRYPTO_CIPHER_CREATE_SESSION:
g_free(sreq->info.u.sym_sess_info.cipher_key);
g_free(sreq->info.u.sym_sess_info.auth_key);
break;
case VIRTIO_CRYPTO_AKCIPHER_CREATE_SESSION:
g_free(sreq->info.u.asym_sess_info.key);
break;
case VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION:
case VIRTIO_CRYPTO_HASH_DESTROY_SESSION:
case VIRTIO_CRYPTO_MAC_DESTROY_SESSION:
case VIRTIO_CRYPTO_AEAD_DESTROY_SESSION:
case VIRTIO_CRYPTO_AKCIPHER_DESTROY_SESSION:
break;
default:
error_report("Unknown opcode: %u", sreq->info.op_code);
}
g_free(sreq);
}
/*
* Transfer virtqueue index to crypto queue index.
* The control virtqueue is after the data virtqueues
* so the input value doesn't need to be adjusted
*/
static inline int virtio_crypto_vq2q(int queue_index)
{
return queue_index;
}
static int
virtio_crypto_cipher_session_helper(VirtIODevice *vdev,
CryptoDevBackendSymSessionInfo *info,
struct virtio_crypto_cipher_session_para *cipher_para,
struct iovec **iov, unsigned int *out_num)
{
VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
unsigned int num = *out_num;
info->cipher_alg = ldl_le_p(&cipher_para->algo);
info->key_len = ldl_le_p(&cipher_para->keylen);
info->direction = ldl_le_p(&cipher_para->op);
DPRINTF("cipher_alg=%" PRIu32 ", info->direction=%" PRIu32 "\n",
info->cipher_alg, info->direction);
if (info->key_len > vcrypto->conf.max_cipher_key_len) {
error_report("virtio-crypto length of cipher key is too big: %u",
info->key_len);
return -VIRTIO_CRYPTO_ERR;
}
/* Get cipher key */
if (info->key_len > 0) {
size_t s;
DPRINTF("keylen=%" PRIu32 "\n", info->key_len);
info->cipher_key = g_malloc(info->key_len);
s = iov_to_buf(*iov, num, 0, info->cipher_key, info->key_len);
if (unlikely(s != info->key_len)) {
virtio_error(vdev, "virtio-crypto cipher key incorrect");
return -EFAULT;
}
iov_discard_front(iov, &num, info->key_len);
*out_num = num;
}
return 0;
}
static int
virtio_crypto_create_sym_session(VirtIOCrypto *vcrypto,
struct virtio_crypto_sym_create_session_req *sess_req,
uint32_t queue_id,
uint32_t opcode,
struct iovec *iov, unsigned int out_num,
VirtIOCryptoSessionReq *sreq)
{
VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
CryptoDevBackendSymSessionInfo *sym_info = &sreq->info.u.sym_sess_info;
int queue_index;
uint32_t op_type;
int ret;
op_type = ldl_le_p(&sess_req->op_type);
sreq->info.op_code = opcode;
sym_info = &sreq->info.u.sym_sess_info;
sym_info->op_type = op_type;
if (op_type == VIRTIO_CRYPTO_SYM_OP_CIPHER) {
ret = virtio_crypto_cipher_session_helper(vdev, sym_info,
&sess_req->u.cipher.para,
&iov, &out_num);
if (ret < 0) {
return ret;
}
} else if (op_type == VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING) {
size_t s;
/* cipher part */
ret = virtio_crypto_cipher_session_helper(vdev, sym_info,
&sess_req->u.chain.para.cipher_param,
&iov, &out_num);
if (ret < 0) {
return ret;
}
/* hash part */
sym_info->alg_chain_order = ldl_le_p(
&sess_req->u.chain.para.alg_chain_order);
sym_info->add_len = ldl_le_p(&sess_req->u.chain.para.aad_len);
sym_info->hash_mode = ldl_le_p(&sess_req->u.chain.para.hash_mode);
if (sym_info->hash_mode == VIRTIO_CRYPTO_SYM_HASH_MODE_AUTH) {
sym_info->hash_alg =
ldl_le_p(&sess_req->u.chain.para.u.mac_param.algo);
sym_info->auth_key_len = ldl_le_p(
&sess_req->u.chain.para.u.mac_param.auth_key_len);
sym_info->hash_result_len = ldl_le_p(
&sess_req->u.chain.para.u.mac_param.hash_result_len);
if (sym_info->auth_key_len > vcrypto->conf.max_auth_key_len) {
error_report("virtio-crypto length of auth key is too big: %u",
sym_info->auth_key_len);
return -VIRTIO_CRYPTO_ERR;
}
/* get auth key */
if (sym_info->auth_key_len > 0) {
sym_info->auth_key = g_malloc(sym_info->auth_key_len);
s = iov_to_buf(iov, out_num, 0, sym_info->auth_key,
sym_info->auth_key_len);
if (unlikely(s != sym_info->auth_key_len)) {
virtio_error(vdev,
"virtio-crypto authenticated key incorrect");
return -EFAULT;
}
iov_discard_front(&iov, &out_num, sym_info->auth_key_len);
}
} else if (sym_info->hash_mode == VIRTIO_CRYPTO_SYM_HASH_MODE_PLAIN) {
sym_info->hash_alg = ldl_le_p(
&sess_req->u.chain.para.u.hash_param.algo);
sym_info->hash_result_len = ldl_le_p(
&sess_req->u.chain.para.u.hash_param.hash_result_len);
} else {
/* VIRTIO_CRYPTO_SYM_HASH_MODE_NESTED */
error_report("unsupported hash mode");
return -VIRTIO_CRYPTO_NOTSUPP;
}
} else {
/* VIRTIO_CRYPTO_SYM_OP_NONE */
error_report("unsupported cipher op_type: VIRTIO_CRYPTO_SYM_OP_NONE");
return -VIRTIO_CRYPTO_NOTSUPP;
}
queue_index = virtio_crypto_vq2q(queue_id);
return cryptodev_backend_create_session(vcrypto->cryptodev, &sreq->info,
queue_index, sreq->cb, sreq);
}
static int
virtio_crypto_create_asym_session(VirtIOCrypto *vcrypto,
struct virtio_crypto_akcipher_create_session_req *sess_req,
uint32_t queue_id, uint32_t opcode,
struct iovec *iov, unsigned int out_num,
VirtIOCryptoSessionReq *sreq)
{
VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
CryptoDevBackendAsymSessionInfo *asym_info = &sreq->info.u.asym_sess_info;
int queue_index;
uint32_t algo, keytype, keylen;
algo = ldl_le_p(&sess_req->para.algo);
keytype = ldl_le_p(&sess_req->para.keytype);
keylen = ldl_le_p(&sess_req->para.keylen);
if ((keytype != VIRTIO_CRYPTO_AKCIPHER_KEY_TYPE_PUBLIC)
&& (keytype != VIRTIO_CRYPTO_AKCIPHER_KEY_TYPE_PRIVATE)) {
error_report("unsupported asym keytype: %d", keytype);
return -VIRTIO_CRYPTO_NOTSUPP;
}
if (keylen) {
asym_info->key = g_malloc(keylen);
if (iov_to_buf(iov, out_num, 0, asym_info->key, keylen) != keylen) {
virtio_error(vdev, "virtio-crypto asym key incorrect");
return -EFAULT;
}
iov_discard_front(&iov, &out_num, keylen);
}
sreq->info.op_code = opcode;
asym_info = &sreq->info.u.asym_sess_info;
asym_info->algo = algo;
asym_info->keytype = keytype;
asym_info->keylen = keylen;
switch (asym_info->algo) {
case VIRTIO_CRYPTO_AKCIPHER_RSA:
asym_info->u.rsa.padding_algo =
ldl_le_p(&sess_req->para.u.rsa.padding_algo);
asym_info->u.rsa.hash_algo =
ldl_le_p(&sess_req->para.u.rsa.hash_algo);
break;
/* TODO DSA&ECDSA handling */
default:
return -VIRTIO_CRYPTO_ERR;
}
queue_index = virtio_crypto_vq2q(queue_id);
return cryptodev_backend_create_session(vcrypto->cryptodev, &sreq->info,
queue_index, sreq->cb, sreq);
}
static int
virtio_crypto_handle_close_session(VirtIOCrypto *vcrypto,
struct virtio_crypto_destroy_session_req *close_sess_req,
uint32_t queue_id,
VirtIOCryptoSessionReq *sreq)
{
uint64_t session_id;
session_id = ldq_le_p(&close_sess_req->session_id);
DPRINTF("close session, id=%" PRIu64 "\n", session_id);
return cryptodev_backend_close_session(
vcrypto->cryptodev, session_id, queue_id, sreq->cb, sreq);
}
static void virtio_crypto_create_session_completion(void *opaque, int ret)
{
VirtIOCryptoSessionReq *sreq = (VirtIOCryptoSessionReq *)opaque;
VirtQueue *vq = sreq->vq;
VirtQueueElement *elem = sreq->elem;
VirtIODevice *vdev = sreq->vdev;
struct virtio_crypto_session_input input;
struct iovec *in_iov = elem->in_sg;
unsigned in_num = elem->in_num;
size_t s;
memset(&input, 0, sizeof(input));
/* Serious errors, need to reset virtio crypto device */
if (ret == -EFAULT) {
virtqueue_detach_element(vq, elem, 0);
goto out;
} else if (ret == -VIRTIO_CRYPTO_NOTSUPP) {
stl_le_p(&input.status, VIRTIO_CRYPTO_NOTSUPP);
} else if (ret == -VIRTIO_CRYPTO_KEY_REJECTED) {
stl_le_p(&input.status, VIRTIO_CRYPTO_KEY_REJECTED);
} else if (ret != VIRTIO_CRYPTO_OK) {
stl_le_p(&input.status, VIRTIO_CRYPTO_ERR);
} else {
/* Set the session id */
stq_le_p(&input.session_id, sreq->info.session_id);
stl_le_p(&input.status, VIRTIO_CRYPTO_OK);
}
s = iov_from_buf(in_iov, in_num, 0, &input, sizeof(input));
if (unlikely(s != sizeof(input))) {
virtio_error(vdev, "virtio-crypto input incorrect");
virtqueue_detach_element(vq, elem, 0);
goto out;
}
virtqueue_push(vq, elem, sizeof(input));
virtio_notify(vdev, vq);
out:
g_free(elem);
virtio_crypto_free_create_session_req(sreq);
}
static void virtio_crypto_destroy_session_completion(void *opaque, int ret)
{
VirtIOCryptoSessionReq *sreq = (VirtIOCryptoSessionReq *)opaque;
VirtQueue *vq = sreq->vq;
VirtQueueElement *elem = sreq->elem;
VirtIODevice *vdev = sreq->vdev;
struct iovec *in_iov = elem->in_sg;
unsigned in_num = elem->in_num;
uint8_t status;
size_t s;
if (ret < 0) {
status = VIRTIO_CRYPTO_ERR;
} else {
status = VIRTIO_CRYPTO_OK;
}
s = iov_from_buf(in_iov, in_num, 0, &status, sizeof(status));
if (unlikely(s != sizeof(status))) {
virtio_error(vdev, "virtio-crypto status incorrect");
virtqueue_detach_element(vq, elem, 0);
goto out;
}
virtqueue_push(vq, elem, sizeof(status));
virtio_notify(vdev, vq);
out:
g_free(elem);
g_free(sreq);
}
static void virtio_crypto_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
struct virtio_crypto_op_ctrl_req ctrl;
VirtQueueElement *elem;
VirtIOCryptoSessionReq *sreq;
unsigned out_num;
unsigned in_num;
uint32_t queue_id;
uint32_t opcode;
struct virtio_crypto_session_input input;
size_t s;
int ret;
struct iovec *out_iov;
struct iovec *in_iov;
for (;;) {
g_autofree struct iovec *out_iov_copy = NULL;
elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
if (!elem) {
break;
}
if (elem->out_num < 1 || elem->in_num < 1) {
virtio_error(vdev, "virtio-crypto ctrl missing headers");
virtqueue_detach_element(vq, elem, 0);
g_free(elem);
break;
}
out_num = elem->out_num;
out_iov_copy = g_memdup2(elem->out_sg, sizeof(out_iov[0]) * out_num);
out_iov = out_iov_copy;
in_num = elem->in_num;
in_iov = elem->in_sg;
if (unlikely(iov_to_buf(out_iov, out_num, 0, &ctrl, sizeof(ctrl))
!= sizeof(ctrl))) {
virtio_error(vdev, "virtio-crypto request ctrl_hdr too short");
virtqueue_detach_element(vq, elem, 0);
g_free(elem);
break;
}
iov_discard_front(&out_iov, &out_num, sizeof(ctrl));
opcode = ldl_le_p(&ctrl.header.opcode);
queue_id = ldl_le_p(&ctrl.header.queue_id);
sreq = g_new0(VirtIOCryptoSessionReq, 1);
sreq->vdev = vdev;
sreq->vq = vq;
sreq->elem = elem;
switch (opcode) {
case VIRTIO_CRYPTO_CIPHER_CREATE_SESSION:
sreq->cb = virtio_crypto_create_session_completion;
ret = virtio_crypto_create_sym_session(vcrypto,
&ctrl.u.sym_create_session,
queue_id, opcode,
out_iov, out_num,
sreq);
if (ret < 0) {
virtio_crypto_create_session_completion(sreq, ret);
}
break;
case VIRTIO_CRYPTO_AKCIPHER_CREATE_SESSION:
sreq->cb = virtio_crypto_create_session_completion;
ret = virtio_crypto_create_asym_session(vcrypto,
&ctrl.u.akcipher_create_session,
queue_id, opcode,
out_iov, out_num,
sreq);
if (ret < 0) {
virtio_crypto_create_session_completion(sreq, ret);
}
break;
case VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION:
case VIRTIO_CRYPTO_HASH_DESTROY_SESSION:
case VIRTIO_CRYPTO_MAC_DESTROY_SESSION:
case VIRTIO_CRYPTO_AEAD_DESTROY_SESSION:
case VIRTIO_CRYPTO_AKCIPHER_DESTROY_SESSION:
sreq->cb = virtio_crypto_destroy_session_completion;
ret = virtio_crypto_handle_close_session(vcrypto,
&ctrl.u.destroy_session, queue_id,
sreq);
if (ret < 0) {
virtio_crypto_destroy_session_completion(sreq, ret);
}
break;
case VIRTIO_CRYPTO_HASH_CREATE_SESSION:
case VIRTIO_CRYPTO_MAC_CREATE_SESSION:
case VIRTIO_CRYPTO_AEAD_CREATE_SESSION:
default:
memset(&input, 0, sizeof(input));
error_report("virtio-crypto unsupported ctrl opcode: %d", opcode);
stl_le_p(&input.status, VIRTIO_CRYPTO_NOTSUPP);
s = iov_from_buf(in_iov, in_num, 0, &input, sizeof(input));
if (unlikely(s != sizeof(input))) {
virtio_error(vdev, "virtio-crypto input incorrect");
virtqueue_detach_element(vq, elem, 0);
} else {
virtqueue_push(vq, elem, sizeof(input));
virtio_notify(vdev, vq);
}
g_free(sreq);
g_free(elem);
break;
} /* end switch case */
} /* end for loop */
}
static void virtio_crypto_init_request(VirtIOCrypto *vcrypto, VirtQueue *vq,
VirtIOCryptoReq *req)
{
req->vcrypto = vcrypto;
req->vq = vq;
req->in = NULL;
req->in_iov = NULL;
req->in_num = 0;
req->in_len = 0;
req->flags = QCRYPTODEV_BACKEND_ALG__MAX;
memset(&req->op_info, 0x00, sizeof(req->op_info));
}
static void virtio_crypto_free_request(VirtIOCryptoReq *req)
{
if (!req) {
return;
}
if (req->flags == QCRYPTODEV_BACKEND_ALG_SYM) {
size_t max_len;
CryptoDevBackendSymOpInfo *op_info = req->op_info.u.sym_op_info;
if (op_info) {
max_len = op_info->iv_len +
op_info->aad_len +
op_info->src_len +
op_info->dst_len +
op_info->digest_result_len;
/* Zeroize and free request data structure */
memset(op_info, 0, sizeof(*op_info) + max_len);
g_free(op_info);
}
} else if (req->flags == QCRYPTODEV_BACKEND_ALG_ASYM) {
CryptoDevBackendAsymOpInfo *op_info = req->op_info.u.asym_op_info;
if (op_info) {
g_free(op_info->src);
g_free(op_info->dst);
memset(op_info, 0, sizeof(*op_info));
g_free(op_info);
}
}
g_free(req->in_iov);
g_free(req);
}
static void
virtio_crypto_sym_input_data_helper(VirtIODevice *vdev,
VirtIOCryptoReq *req,
uint32_t status,
CryptoDevBackendSymOpInfo *sym_op_info)
{
size_t s, len;
struct iovec *in_iov = req->in_iov;
if (status != VIRTIO_CRYPTO_OK) {
return;
}
len = sym_op_info->src_len;
/* Save the cipher result */
s = iov_from_buf(in_iov, req->in_num, 0, sym_op_info->dst, len);
if (s != len) {
virtio_error(vdev, "virtio-crypto dest data incorrect");
return;
}
iov_discard_front(&in_iov, &req->in_num, len);
if (sym_op_info->op_type ==
VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING) {
/* Save the digest result */
s = iov_from_buf(in_iov, req->in_num, 0,
sym_op_info->digest_result,
sym_op_info->digest_result_len);
if (s != sym_op_info->digest_result_len) {
virtio_error(vdev, "virtio-crypto digest result incorrect");
}
}
}
static void
virtio_crypto_akcipher_input_data_helper(VirtIODevice *vdev,
VirtIOCryptoReq *req, int32_t status,
CryptoDevBackendAsymOpInfo *asym_op_info)
{
size_t s, len;
struct iovec *in_iov = req->in_iov;
if (status != VIRTIO_CRYPTO_OK) {
return;
}
len = asym_op_info->dst_len;
if (!len) {
return;
}
s = iov_from_buf(in_iov, req->in_num, 0, asym_op_info->dst, len);
if (s != len) {
virtio_error(vdev, "virtio-crypto asym dest data incorrect");
return;
}
iov_discard_front(&in_iov, &req->in_num, len);
/* For akcipher, dst_len may be changed after operation */
req->in_len = sizeof(struct virtio_crypto_inhdr) + asym_op_info->dst_len;
}
static void virtio_crypto_req_complete(void *opaque, int ret)
{
VirtIOCryptoReq *req = (VirtIOCryptoReq *)opaque;
VirtIOCrypto *vcrypto = req->vcrypto;
VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
uint8_t status = -ret;
if (req->flags == QCRYPTODEV_BACKEND_ALG_SYM) {
virtio_crypto_sym_input_data_helper(vdev, req, status,
req->op_info.u.sym_op_info);
} else if (req->flags == QCRYPTODEV_BACKEND_ALG_ASYM) {
virtio_crypto_akcipher_input_data_helper(vdev, req, status,
req->op_info.u.asym_op_info);
}
stb_p(&req->in->status, status);
virtqueue_push(req->vq, &req->elem, req->in_len);
virtio_notify(vdev, req->vq);
virtio_crypto_free_request(req);
}
static VirtIOCryptoReq *
virtio_crypto_get_request(VirtIOCrypto *s, VirtQueue *vq)
{
VirtIOCryptoReq *req = virtqueue_pop(vq, sizeof(VirtIOCryptoReq));
if (req) {
virtio_crypto_init_request(s, vq, req);
}
return req;
}
static CryptoDevBackendSymOpInfo *
virtio_crypto_sym_op_helper(VirtIODevice *vdev,
struct virtio_crypto_cipher_para *cipher_para,
struct virtio_crypto_alg_chain_data_para *alg_chain_para,
struct iovec *iov, unsigned int out_num)
{
VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
CryptoDevBackendSymOpInfo *op_info;
uint32_t src_len = 0, dst_len = 0;
uint32_t iv_len = 0;
uint32_t aad_len = 0, hash_result_len = 0;
uint32_t hash_start_src_offset = 0, len_to_hash = 0;
uint32_t cipher_start_src_offset = 0, len_to_cipher = 0;
uint64_t max_len, curr_size = 0;
size_t s;
/* Plain cipher */
if (cipher_para) {
iv_len = ldl_le_p(&cipher_para->iv_len);
src_len = ldl_le_p(&cipher_para->src_data_len);
dst_len = ldl_le_p(&cipher_para->dst_data_len);
} else if (alg_chain_para) { /* Algorithm chain */
iv_len = ldl_le_p(&alg_chain_para->iv_len);
src_len = ldl_le_p(&alg_chain_para->src_data_len);
dst_len = ldl_le_p(&alg_chain_para->dst_data_len);
aad_len = ldl_le_p(&alg_chain_para->aad_len);
hash_result_len = ldl_le_p(&alg_chain_para->hash_result_len);
hash_start_src_offset = ldl_le_p(
&alg_chain_para->hash_start_src_offset);
cipher_start_src_offset = ldl_le_p(
&alg_chain_para->cipher_start_src_offset);
len_to_cipher = ldl_le_p(&alg_chain_para->len_to_cipher);
len_to_hash = ldl_le_p(&alg_chain_para->len_to_hash);
} else {
return NULL;
}
if (unlikely(src_len != dst_len)) {
virtio_error(vdev, "sym request src len is different from dst len");
return NULL;
}
max_len = (uint64_t)iv_len + aad_len + src_len + dst_len + hash_result_len;
if (unlikely(max_len > vcrypto->conf.max_size)) {
virtio_error(vdev, "virtio-crypto too big length");
return NULL;
}
op_info = g_malloc0(sizeof(CryptoDevBackendSymOpInfo) + max_len);
op_info->iv_len = iv_len;
op_info->src_len = src_len;
op_info->dst_len = dst_len;
op_info->aad_len = aad_len;
op_info->digest_result_len = hash_result_len;
op_info->hash_start_src_offset = hash_start_src_offset;
op_info->len_to_hash = len_to_hash;
op_info->cipher_start_src_offset = cipher_start_src_offset;
op_info->len_to_cipher = len_to_cipher;
/* Handle the initialization vector */
if (op_info->iv_len > 0) {
DPRINTF("iv_len=%" PRIu32 "\n", op_info->iv_len);
op_info->iv = op_info->data + curr_size;
s = iov_to_buf(iov, out_num, 0, op_info->iv, op_info->iv_len);
if (unlikely(s != op_info->iv_len)) {
virtio_error(vdev, "virtio-crypto iv incorrect");
goto err;
}
iov_discard_front(&iov, &out_num, op_info->iv_len);
curr_size += op_info->iv_len;
}
/* Handle additional authentication data if exists */
if (op_info->aad_len > 0) {
DPRINTF("aad_len=%" PRIu32 "\n", op_info->aad_len);
op_info->aad_data = op_info->data + curr_size;
s = iov_to_buf(iov, out_num, 0, op_info->aad_data, op_info->aad_len);
if (unlikely(s != op_info->aad_len)) {
virtio_error(vdev, "virtio-crypto additional auth data incorrect");
goto err;
}
iov_discard_front(&iov, &out_num, op_info->aad_len);
curr_size += op_info->aad_len;
}
/* Handle the source data */
if (op_info->src_len > 0) {
DPRINTF("src_len=%" PRIu32 "\n", op_info->src_len);
op_info->src = op_info->data + curr_size;
s = iov_to_buf(iov, out_num, 0, op_info->src, op_info->src_len);
if (unlikely(s != op_info->src_len)) {
virtio_error(vdev, "virtio-crypto source data incorrect");
goto err;
}
iov_discard_front(&iov, &out_num, op_info->src_len);
curr_size += op_info->src_len;
}
/* Handle the destination data */
op_info->dst = op_info->data + curr_size;
curr_size += op_info->dst_len;
DPRINTF("dst_len=%" PRIu32 "\n", op_info->dst_len);
/* Handle the hash digest result */
if (hash_result_len > 0) {
DPRINTF("hash_result_len=%" PRIu32 "\n", hash_result_len);
op_info->digest_result = op_info->data + curr_size;
}
return op_info;
err:
g_free(op_info);
return NULL;
}
static int
virtio_crypto_handle_sym_req(VirtIOCrypto *vcrypto,
struct virtio_crypto_sym_data_req *req,
CryptoDevBackendOpInfo *op_info,
struct iovec *iov, unsigned int out_num)
{
VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
CryptoDevBackendSymOpInfo *sym_op_info;
uint32_t op_type;
op_type = ldl_le_p(&req->op_type);
if (op_type == VIRTIO_CRYPTO_SYM_OP_CIPHER) {
sym_op_info = virtio_crypto_sym_op_helper(vdev, &req->u.cipher.para,
NULL, iov, out_num);
if (!sym_op_info) {
return -EFAULT;
}
} else if (op_type == VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING) {
sym_op_info = virtio_crypto_sym_op_helper(vdev, NULL,
&req->u.chain.para,
iov, out_num);
if (!sym_op_info) {
return -EFAULT;
}
} else {
/* VIRTIO_CRYPTO_SYM_OP_NONE */
error_report("virtio-crypto unsupported cipher type");
return -VIRTIO_CRYPTO_NOTSUPP;
}
sym_op_info->op_type = op_type;
op_info->u.sym_op_info = sym_op_info;
return 0;
}
static int
virtio_crypto_handle_asym_req(VirtIOCrypto *vcrypto,
struct virtio_crypto_akcipher_data_req *req,
CryptoDevBackendOpInfo *op_info,
struct iovec *iov, unsigned int out_num)
{
VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
CryptoDevBackendAsymOpInfo *asym_op_info;
uint32_t src_len;
uint32_t dst_len;
uint32_t len;
uint8_t *src = NULL;
uint8_t *dst = NULL;
asym_op_info = g_new0(CryptoDevBackendAsymOpInfo, 1);
src_len = ldl_le_p(&req->para.src_data_len);
dst_len = ldl_le_p(&req->para.dst_data_len);
if (src_len > 0) {
src = g_malloc0(src_len);
len = iov_to_buf(iov, out_num, 0, src, src_len);
if (unlikely(len != src_len)) {
virtio_error(vdev, "virtio-crypto asym src data incorrect"
"expected %u, actual %u", src_len, len);
goto err;
}
iov_discard_front(&iov, &out_num, src_len);
}
if (dst_len > 0) {
dst = g_malloc0(dst_len);
if (op_info->op_code == VIRTIO_CRYPTO_AKCIPHER_VERIFY) {
len = iov_to_buf(iov, out_num, 0, dst, dst_len);
if (unlikely(len != dst_len)) {
virtio_error(vdev, "virtio-crypto asym dst data incorrect"
"expected %u, actual %u", dst_len, len);
goto err;
}
iov_discard_front(&iov, &out_num, dst_len);
}
}
asym_op_info->src_len = src_len;
asym_op_info->dst_len = dst_len;
asym_op_info->src = src;
asym_op_info->dst = dst;
op_info->u.asym_op_info = asym_op_info;
return 0;
err:
g_free(asym_op_info);
g_free(src);
g_free(dst);
return -EFAULT;
}
static int
virtio_crypto_handle_request(VirtIOCryptoReq *request)
{
VirtIOCrypto *vcrypto = request->vcrypto;
VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
VirtQueueElement *elem = &request->elem;
int queue_index = virtio_crypto_vq2q(virtio_get_queue_index(request->vq));
struct virtio_crypto_op_data_req req;
int ret;
g_autofree struct iovec *in_iov_copy = NULL;
g_autofree struct iovec *out_iov_copy = NULL;
struct iovec *in_iov;
struct iovec *out_iov;
unsigned in_num;
unsigned out_num;
uint32_t opcode;
CryptoDevBackendOpInfo *op_info = &request->op_info;
if (elem->out_num < 1 || elem->in_num < 1) {
virtio_error(vdev, "virtio-crypto dataq missing headers");
return -1;
}
out_num = elem->out_num;
out_iov_copy = g_memdup2(elem->out_sg, sizeof(out_iov[0]) * out_num);
out_iov = out_iov_copy;
in_num = elem->in_num;
in_iov_copy = g_memdup2(elem->in_sg, sizeof(in_iov[0]) * in_num);
in_iov = in_iov_copy;
if (unlikely(iov_to_buf(out_iov, out_num, 0, &req, sizeof(req))
!= sizeof(req))) {
virtio_error(vdev, "virtio-crypto request outhdr too short");
return -1;
}
iov_discard_front(&out_iov, &out_num, sizeof(req));
if (in_iov[in_num - 1].iov_len <
sizeof(struct virtio_crypto_inhdr)) {
virtio_error(vdev, "virtio-crypto request inhdr too short");
return -1;
}
/* We always touch the last byte, so just see how big in_iov is. */
request->in_len = iov_size(in_iov, in_num);
request->in = (void *)in_iov[in_num - 1].iov_base
+ in_iov[in_num - 1].iov_len
- sizeof(struct virtio_crypto_inhdr);
iov_discard_back(in_iov, &in_num, sizeof(struct virtio_crypto_inhdr));
/*
* The length of operation result, including dest_data
* and digest_result if exists.
*/
request->in_num = in_num;
request->in_iov = in_iov;
/* now, we free the in_iov_copy inside virtio_crypto_free_request */
in_iov_copy = NULL;
opcode = ldl_le_p(&req.header.opcode);
op_info->session_id = ldq_le_p(&req.header.session_id);
op_info->op_code = opcode;
op_info->queue_index = queue_index;
op_info->cb = virtio_crypto_req_complete;
op_info->opaque = request;
switch (opcode) {
case VIRTIO_CRYPTO_CIPHER_ENCRYPT:
case VIRTIO_CRYPTO_CIPHER_DECRYPT:
op_info->algtype = request->flags = QCRYPTODEV_BACKEND_ALG_SYM;
ret = virtio_crypto_handle_sym_req(vcrypto,
&req.u.sym_req, op_info,
out_iov, out_num);
goto check_result;
case VIRTIO_CRYPTO_AKCIPHER_ENCRYPT:
case VIRTIO_CRYPTO_AKCIPHER_DECRYPT:
case VIRTIO_CRYPTO_AKCIPHER_SIGN:
case VIRTIO_CRYPTO_AKCIPHER_VERIFY:
op_info->algtype = request->flags = QCRYPTODEV_BACKEND_ALG_ASYM;
ret = virtio_crypto_handle_asym_req(vcrypto,
&req.u.akcipher_req, op_info,
out_iov, out_num);
check_result:
/* Serious errors, need to reset virtio crypto device */
if (ret == -EFAULT) {
return -1;
} else if (ret == -VIRTIO_CRYPTO_NOTSUPP) {
virtio_crypto_req_complete(request, -VIRTIO_CRYPTO_NOTSUPP);
} else {
ret = cryptodev_backend_crypto_operation(vcrypto->cryptodev,
op_info);
if (ret < 0) {
virtio_crypto_req_complete(request, ret);
}
}
break;
case VIRTIO_CRYPTO_HASH:
case VIRTIO_CRYPTO_MAC:
case VIRTIO_CRYPTO_AEAD_ENCRYPT:
case VIRTIO_CRYPTO_AEAD_DECRYPT:
default:
error_report("virtio-crypto unsupported dataq opcode: %u",
opcode);
virtio_crypto_req_complete(request, -VIRTIO_CRYPTO_NOTSUPP);
}
return 0;
}
static void virtio_crypto_handle_dataq(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
VirtIOCryptoReq *req;
while ((req = virtio_crypto_get_request(vcrypto, vq))) {
if (virtio_crypto_handle_request(req) < 0) {
virtqueue_detach_element(req->vq, &req->elem, 0);
virtio_crypto_free_request(req);
break;
}
}
}
static void virtio_crypto_dataq_bh(void *opaque)
{
VirtIOCryptoQueue *q = opaque;
VirtIOCrypto *vcrypto = q->vcrypto;
VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
/* This happens when device was stopped but BH wasn't. */
if (!vdev->vm_running) {
return;
}
/* Just in case the driver is not ready on more */
if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) {
return;
}
for (;;) {
virtio_crypto_handle_dataq(vdev, q->dataq);
virtio_queue_set_notification(q->dataq, 1);
/* Are we done or did the guest add more buffers? */
if (virtio_queue_empty(q->dataq)) {
break;
}
virtio_queue_set_notification(q->dataq, 0);
}
}
static void
virtio_crypto_handle_dataq_bh(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
VirtIOCryptoQueue *q =
&vcrypto->vqs[virtio_crypto_vq2q(virtio_get_queue_index(vq))];
/* This happens when device was stopped but VCPU wasn't. */
if (!vdev->vm_running) {
return;
}
virtio_queue_set_notification(vq, 0);
qemu_bh_schedule(q->dataq_bh);
}
static uint64_t virtio_crypto_get_features(VirtIODevice *vdev,
uint64_t features,
Error **errp)
{
return features;
}
static void virtio_crypto_reset(VirtIODevice *vdev)
{
VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
/* multiqueue is disabled by default */
vcrypto->curr_queues = 1;
if (!cryptodev_backend_is_ready(vcrypto->cryptodev)) {
vcrypto->status &= ~VIRTIO_CRYPTO_S_HW_READY;
} else {
vcrypto->status |= VIRTIO_CRYPTO_S_HW_READY;
}
}
static uint32_t virtio_crypto_init_services(uint32_t qservices)
{
uint32_t vservices = 0;
if (qservices & (1 << QCRYPTODEV_BACKEND_SERVICE_CIPHER)) {
vservices |= (1 << VIRTIO_CRYPTO_SERVICE_CIPHER);
}
if (qservices & (1 << QCRYPTODEV_BACKEND_SERVICE_HASH)) {
vservices |= (1 << VIRTIO_CRYPTO_SERVICE_HASH);
}
if (qservices & (1 << QCRYPTODEV_BACKEND_SERVICE_MAC)) {
vservices |= (1 << VIRTIO_CRYPTO_SERVICE_MAC);
}
if (qservices & (1 << QCRYPTODEV_BACKEND_SERVICE_AEAD)) {
vservices |= (1 << VIRTIO_CRYPTO_SERVICE_AEAD);
}
if (qservices & (1 << QCRYPTODEV_BACKEND_SERVICE_AKCIPHER)) {
vservices |= (1 << VIRTIO_CRYPTO_SERVICE_AKCIPHER);
}
return vservices;
}
static void virtio_crypto_init_config(VirtIODevice *vdev)
{
VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
vcrypto->conf.crypto_services = virtio_crypto_init_services(
vcrypto->conf.cryptodev->conf.crypto_services);
vcrypto->conf.cipher_algo_l =
vcrypto->conf.cryptodev->conf.cipher_algo_l;
vcrypto->conf.cipher_algo_h =
vcrypto->conf.cryptodev->conf.cipher_algo_h;
vcrypto->conf.hash_algo = vcrypto->conf.cryptodev->conf.hash_algo;
vcrypto->conf.mac_algo_l = vcrypto->conf.cryptodev->conf.mac_algo_l;
vcrypto->conf.mac_algo_h = vcrypto->conf.cryptodev->conf.mac_algo_h;
vcrypto->conf.aead_algo = vcrypto->conf.cryptodev->conf.aead_algo;
vcrypto->conf.akcipher_algo = vcrypto->conf.cryptodev->conf.akcipher_algo;
vcrypto->conf.max_cipher_key_len =
vcrypto->conf.cryptodev->conf.max_cipher_key_len;
vcrypto->conf.max_auth_key_len =
vcrypto->conf.cryptodev->conf.max_auth_key_len;
vcrypto->conf.max_size = vcrypto->conf.cryptodev->conf.max_size;
}
static void virtio_crypto_device_realize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev);
int i;
vcrypto->cryptodev = vcrypto->conf.cryptodev;
if (vcrypto->cryptodev == NULL) {
error_setg(errp, "'cryptodev' parameter expects a valid object");
return;
} else if (cryptodev_backend_is_used(vcrypto->cryptodev)) {
error_setg(errp, "can't use already used cryptodev backend: %s",
object_get_canonical_path_component(OBJECT(vcrypto->conf.cryptodev)));
return;
}
vcrypto->max_queues = MAX(vcrypto->cryptodev->conf.peers.queues, 1);
if (vcrypto->max_queues + 1 > VIRTIO_QUEUE_MAX) {
error_setg(errp, "Invalid number of queues (= %" PRIu32 "), "
"must be a positive integer less than %d.",
vcrypto->max_queues, VIRTIO_QUEUE_MAX);
return;
}
virtio_init(vdev, VIRTIO_ID_CRYPTO, vcrypto->config_size);
vcrypto->curr_queues = 1;
vcrypto->vqs = g_new0(VirtIOCryptoQueue, vcrypto->max_queues);
for (i = 0; i < vcrypto->max_queues; i++) {
vcrypto->vqs[i].dataq =
virtio_add_queue(vdev, 1024, virtio_crypto_handle_dataq_bh);
vcrypto->vqs[i].dataq_bh =
virtio_bh_new_guarded(dev, virtio_crypto_dataq_bh,
&vcrypto->vqs[i]);
vcrypto->vqs[i].vcrypto = vcrypto;
}
vcrypto->ctrl_vq = virtio_add_queue(vdev, 1024, virtio_crypto_handle_ctrl);
if (!cryptodev_backend_is_ready(vcrypto->cryptodev)) {
vcrypto->status &= ~VIRTIO_CRYPTO_S_HW_READY;
} else {
vcrypto->status |= VIRTIO_CRYPTO_S_HW_READY;
}
virtio_crypto_init_config(vdev);
cryptodev_backend_set_used(vcrypto->cryptodev, true);
}
static void virtio_crypto_device_unrealize(DeviceState *dev)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev);
VirtIOCryptoQueue *q;
int i, max_queues;
max_queues = vcrypto->multiqueue ? vcrypto->max_queues : 1;
for (i = 0; i < max_queues; i++) {
virtio_delete_queue(vcrypto->vqs[i].dataq);
q = &vcrypto->vqs[i];
qemu_bh_delete(q->dataq_bh);
}
g_free(vcrypto->vqs);
virtio_delete_queue(vcrypto->ctrl_vq);
virtio_cleanup(vdev);
cryptodev_backend_set_used(vcrypto->cryptodev, false);
}
static const VMStateDescription vmstate_virtio_crypto = {
.name = "virtio-crypto",
.unmigratable = 1,
.minimum_version_id = VIRTIO_CRYPTO_VM_VERSION,
.version_id = VIRTIO_CRYPTO_VM_VERSION,
.fields = (const VMStateField[]) {
VMSTATE_VIRTIO_DEVICE,
VMSTATE_END_OF_LIST()
},
};
static Property virtio_crypto_properties[] = {
DEFINE_PROP_LINK("cryptodev", VirtIOCrypto, conf.cryptodev,
TYPE_CRYPTODEV_BACKEND, CryptoDevBackend *),
DEFINE_PROP_END_OF_LIST(),
};
static void virtio_crypto_get_config(VirtIODevice *vdev, uint8_t *config)
{
VirtIOCrypto *c = VIRTIO_CRYPTO(vdev);
struct virtio_crypto_config crypto_cfg = {};
/*
* Virtio-crypto device conforms to VIRTIO 1.0 which is always LE,
* so we can use LE accessors directly.
*/
stl_le_p(&crypto_cfg.status, c->status);
stl_le_p(&crypto_cfg.max_dataqueues, c->max_queues);
stl_le_p(&crypto_cfg.crypto_services, c->conf.crypto_services);
stl_le_p(&crypto_cfg.cipher_algo_l, c->conf.cipher_algo_l);
stl_le_p(&crypto_cfg.cipher_algo_h, c->conf.cipher_algo_h);
stl_le_p(&crypto_cfg.hash_algo, c->conf.hash_algo);
stl_le_p(&crypto_cfg.mac_algo_l, c->conf.mac_algo_l);
stl_le_p(&crypto_cfg.mac_algo_h, c->conf.mac_algo_h);
stl_le_p(&crypto_cfg.aead_algo, c->conf.aead_algo);
stl_le_p(&crypto_cfg.max_cipher_key_len, c->conf.max_cipher_key_len);
stl_le_p(&crypto_cfg.max_auth_key_len, c->conf.max_auth_key_len);
stq_le_p(&crypto_cfg.max_size, c->conf.max_size);
stl_le_p(&crypto_cfg.akcipher_algo, c->conf.akcipher_algo);
memcpy(config, &crypto_cfg, c->config_size);
}
static bool virtio_crypto_started(VirtIOCrypto *c, uint8_t status)
{
VirtIODevice *vdev = VIRTIO_DEVICE(c);
return (status & VIRTIO_CONFIG_S_DRIVER_OK) &&
(c->status & VIRTIO_CRYPTO_S_HW_READY) && vdev->vm_running;
}
static void virtio_crypto_vhost_status(VirtIOCrypto *c, uint8_t status)
{
VirtIODevice *vdev = VIRTIO_DEVICE(c);
int queues = c->multiqueue ? c->max_queues : 1;
CryptoDevBackend *b = c->cryptodev;
CryptoDevBackendClient *cc = b->conf.peers.ccs[0];
if (!cryptodev_get_vhost(cc, b, 0)) {
return;
}
if ((virtio_crypto_started(c, status)) == !!c->vhost_started) {
return;
}
if (!c->vhost_started) {
int r;
c->vhost_started = 1;
r = cryptodev_vhost_start(vdev, queues);
if (r < 0) {
error_report("unable to start vhost crypto: %d: "
"falling back on userspace virtio", -r);
c->vhost_started = 0;
}
} else {
cryptodev_vhost_stop(vdev, queues);
c->vhost_started = 0;
}
}
static void virtio_crypto_set_status(VirtIODevice *vdev, uint8_t status)
{
VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
virtio_crypto_vhost_status(vcrypto, status);
}
static void virtio_crypto_guest_notifier_mask(VirtIODevice *vdev, int idx,
bool mask)
{
VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
int queue = virtio_crypto_vq2q(idx);
assert(vcrypto->vhost_started);
/*
* Add the check for configure interrupt, Use VIRTIO_CONFIG_IRQ_IDX -1
* as the macro of configure interrupt's IDX, If this driver does not
* support, the function will return
*/
if (idx == VIRTIO_CONFIG_IRQ_IDX) {
return;
}
cryptodev_vhost_virtqueue_mask(vdev, queue, idx, mask);
}
static bool virtio_crypto_guest_notifier_pending(VirtIODevice *vdev, int idx)
{
VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
int queue = virtio_crypto_vq2q(idx);
assert(vcrypto->vhost_started);
/*
* Add the check for configure interrupt, Use VIRTIO_CONFIG_IRQ_IDX -1
* as the macro of configure interrupt's IDX, If this driver does not
* support, the function will return
*/
if (idx == VIRTIO_CONFIG_IRQ_IDX) {
return false;
}
return cryptodev_vhost_virtqueue_pending(vdev, queue, idx);
}
static struct vhost_dev *virtio_crypto_get_vhost(VirtIODevice *vdev)
{
VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
CryptoDevBackend *b = vcrypto->cryptodev;
CryptoDevBackendClient *cc = b->conf.peers.ccs[0];
CryptoDevBackendVhost *vhost_crypto = cryptodev_get_vhost(cc, b, 0);
return &vhost_crypto->dev;
}
static void virtio_crypto_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
device_class_set_props(dc, virtio_crypto_properties);
dc->vmsd = &vmstate_virtio_crypto;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
vdc->realize = virtio_crypto_device_realize;
vdc->unrealize = virtio_crypto_device_unrealize;
vdc->get_config = virtio_crypto_get_config;
vdc->get_features = virtio_crypto_get_features;
vdc->reset = virtio_crypto_reset;
vdc->set_status = virtio_crypto_set_status;
vdc->guest_notifier_mask = virtio_crypto_guest_notifier_mask;
vdc->guest_notifier_pending = virtio_crypto_guest_notifier_pending;
vdc->get_vhost = virtio_crypto_get_vhost;
}
static void virtio_crypto_instance_init(Object *obj)
{
VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(obj);
/*
* The default config_size is sizeof(struct virtio_crypto_config).
* Can be overridden with virtio_crypto_set_config_size.
*/
vcrypto->config_size = sizeof(struct virtio_crypto_config);
}
static const TypeInfo virtio_crypto_info = {
.name = TYPE_VIRTIO_CRYPTO,
.parent = TYPE_VIRTIO_DEVICE,
.instance_size = sizeof(VirtIOCrypto),
.instance_init = virtio_crypto_instance_init,
.class_init = virtio_crypto_class_init,
};
static void virtio_register_types(void)
{
type_register_static(&virtio_crypto_info);
}
type_init(virtio_register_types)
Reference in New Issue View Git Blame Copy Permalink