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Drivers: hv: utils: fix a race on userspace daemons registration
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Background: userspace daemons registration protocol for Hyper-V utilities
drivers has two steps:
1) daemon writes its own version to kernel
2) kernel reads it and replies with module version
at this point we consider the handshake procedure being completed and we
do hv_poll_channel() transitioning the utility device to HVUTIL_READY
state. At this point we're ready to handle messages from kernel.

When hvutil_transport is in HVUTIL_TRANSPORT_CHARDEV mode we have a
single buffer for outgoing message. hvutil_transport_send() puts to this
buffer and till the buffer is cleared with hvt_op_read() returns -EFAULT
to all consequent calls. Host<->guest protocol guarantees there is no more
than one request at a time and we will not get new requests till we reply
to the previous one so this single message buffer is enough.

Now to the race. When we finish negotiation procedure and send kernel
module version to userspace with hvutil_transport_send() it goes into the
above mentioned buffer and if the daemon is slow enough to read it from
there we can get a collision when a request from the host comes, we won't
be able to put anything to the buffer so the request will be lost. To
solve the issue we need to know when the negotiation is really done (when
the version message is read by the daemon) and transition to HVUTIL_READY
state after this happens. Implement a callback on read to support this.
Old style netlink communication is not affected by the change, we don't
really know when these messages are delivered but we don't have a single
message buffer there.

Reported-by: Barry Davis <barry_davis@stormagic.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@vittyvk @gregkh
vittyvk authored and gregkh committed Aug 31, 2016
1 parent 396e287 commit e0fa3e5
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Showing 5 changed files with 54 additions and 22 deletions.
14 changes: 10 additions & 4 deletions drivers/hv/hv_fcopy.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,12 @@ static void fcopy_timeout_func(struct work_struct *dummy)
hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper);
}

static void fcopy_register_done(void)
{
pr_debug("FCP: userspace daemon registered\n");
hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper);
}

static int fcopy_handle_handshake(u32 version)
{
u32 our_ver = FCOPY_CURRENT_VERSION;
Expand All @@ -94,7 +100,8 @@ static int fcopy_handle_handshake(u32 version)
break;
case FCOPY_VERSION_1:
/* Daemon expects us to reply with our own version */
if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver)))
if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver),
fcopy_register_done))
return -EFAULT;
dm_reg_value = version;
break;
Expand All @@ -107,8 +114,7 @@ static int fcopy_handle_handshake(u32 version)
*/
return -EINVAL;
}
pr_debug("FCP: userspace daemon ver. %d registered\n", version);
hv_poll_channel(fcopy_transaction.recv_channel, fcopy_poll_wrapper);
pr_debug("FCP: userspace daemon ver. %d connected\n", version);
return 0;
}

Expand Down Expand Up @@ -161,7 +167,7 @@ static void fcopy_send_data(struct work_struct *dummy)
}

fcopy_transaction.state = HVUTIL_USERSPACE_REQ;
rc = hvutil_transport_send(hvt, out_src, out_len);
rc = hvutil_transport_send(hvt, out_src, out_len, NULL);
if (rc) {
pr_debug("FCP: failed to communicate to the daemon: %d\n", rc);
if (cancel_delayed_work_sync(&fcopy_timeout_work)) {
Expand Down
27 changes: 16 additions & 11 deletions drivers/hv/hv_kvp.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -102,6 +102,17 @@ static void kvp_poll_wrapper(void *channel)
hv_kvp_onchannelcallback(channel);
}

static void kvp_register_done(void)
{
/*
* If we're still negotiating with the host cancel the timeout
* work to not poll the channel twice.
*/
pr_debug("KVP: userspace daemon registered\n");
cancel_delayed_work_sync(&kvp_host_handshake_work);
hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);
}

static void
kvp_register(int reg_value)
{
Expand All @@ -116,7 +127,8 @@ kvp_register(int reg_value)
kvp_msg->kvp_hdr.operation = reg_value;
strcpy(version, HV_DRV_VERSION);

hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg));
hvutil_transport_send(hvt, kvp_msg, sizeof(*kvp_msg),
kvp_register_done);
kfree(kvp_msg);
}
}
Expand Down Expand Up @@ -158,17 +170,10 @@ static int kvp_handle_handshake(struct hv_kvp_msg *msg)
/*
* We have a compatible daemon; complete the handshake.
*/
pr_debug("KVP: userspace daemon ver. %d registered\n",
KVP_OP_REGISTER);
pr_debug("KVP: userspace daemon ver. %d connected\n",
msg->kvp_hdr.operation);
kvp_register(dm_reg_value);

/*
* If we're still negotiating with the host cancel the timeout
* work to not poll the channel twice.
*/
cancel_delayed_work_sync(&kvp_host_handshake_work);
hv_poll_channel(kvp_transaction.recv_channel, kvp_poll_wrapper);

return 0;
}

Expand Down Expand Up @@ -455,7 +460,7 @@ kvp_send_key(struct work_struct *dummy)
}

kvp_transaction.state = HVUTIL_USERSPACE_REQ;
rc = hvutil_transport_send(hvt, message, sizeof(*message));
rc = hvutil_transport_send(hvt, message, sizeof(*message), NULL);
if (rc) {
pr_debug("KVP: failed to communicate to the daemon: %d\n", rc);
if (cancel_delayed_work_sync(&kvp_timeout_work)) {
Expand Down
16 changes: 11 additions & 5 deletions drivers/hv/hv_snapshot.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -95,6 +95,12 @@ static void vss_timeout_func(struct work_struct *dummy)
hv_poll_channel(vss_transaction.recv_channel, vss_poll_wrapper);
}

static void vss_register_done(void)
{
hv_poll_channel(vss_transaction.recv_channel, vss_poll_wrapper);
pr_debug("VSS: userspace daemon registered\n");
}

static int vss_handle_handshake(struct hv_vss_msg *vss_msg)
{
u32 our_ver = VSS_OP_REGISTER1;
Expand All @@ -105,16 +111,16 @@ static int vss_handle_handshake(struct hv_vss_msg *vss_msg)
dm_reg_value = VSS_OP_REGISTER;
break;
case VSS_OP_REGISTER1:
/* Daemon expects us to reply with our own version*/
if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver)))
/* Daemon expects us to reply with our own version */
if (hvutil_transport_send(hvt, &our_ver, sizeof(our_ver),
vss_register_done))
return -EFAULT;
dm_reg_value = VSS_OP_REGISTER1;
break;
default:
return -EINVAL;
}
hv_poll_channel(vss_transaction.recv_channel, vss_poll_wrapper);
pr_debug("VSS: userspace daemon ver. %d registered\n", dm_reg_value);
pr_debug("VSS: userspace daemon ver. %d connected\n", dm_reg_value);
return 0;
}

Expand Down Expand Up @@ -168,7 +174,7 @@ static void vss_send_op(struct work_struct *dummy)
vss_msg->vss_hdr.operation = op;

vss_transaction.state = HVUTIL_USERSPACE_REQ;
rc = hvutil_transport_send(hvt, vss_msg, sizeof(*vss_msg));
rc = hvutil_transport_send(hvt, vss_msg, sizeof(*vss_msg), NULL);
if (rc) {
pr_warn("VSS: failed to communicate to the daemon: %d\n", rc);
if (cancel_delayed_work_sync(&vss_timeout_work)) {
Expand Down
15 changes: 14 additions & 1 deletion drivers/hv/hv_utils_transport.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,10 @@ static ssize_t hvt_op_read(struct file *file, char __user *buf,
hvt->outmsg = NULL;
hvt->outmsg_len = 0;

if (hvt->on_read)
hvt->on_read();
hvt->on_read = NULL;

out_unlock:
mutex_unlock(&hvt->lock);
return ret;
Expand Down Expand Up @@ -219,7 +223,8 @@ static void hvt_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
mutex_unlock(&hvt->lock);
}

int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len)
int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len,
void (*on_read_cb)(void))
{
struct cn_msg *cn_msg;
int ret = 0;
Expand All @@ -237,6 +242,13 @@ int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len)
memcpy(cn_msg->data, msg, len);
ret = cn_netlink_send(cn_msg, 0, 0, GFP_ATOMIC);
kfree(cn_msg);
/*
* We don't know when netlink messages are delivered but unlike
* in CHARDEV mode we're not blocked and we can send next
* messages right away.
*/
if (on_read_cb)
on_read_cb();
return ret;
}
/* HVUTIL_TRANSPORT_CHARDEV */
Expand All @@ -255,6 +267,7 @@ int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len)
if (hvt->outmsg) {
memcpy(hvt->outmsg, msg, len);
hvt->outmsg_len = len;
hvt->on_read = on_read_cb;
wake_up_interruptible(&hvt->outmsg_q);
} else
ret = -ENOMEM;
Expand Down
4 changes: 3 additions & 1 deletion drivers/hv/hv_utils_transport.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,7 @@ struct hvutil_transport {
struct list_head list; /* hvt_list */
int (*on_msg)(void *, int); /* callback on new user message */
void (*on_reset)(void); /* callback when userspace drops */
void (*on_read)(void); /* callback on message read */
u8 *outmsg; /* message to the userspace */
int outmsg_len; /* its length */
wait_queue_head_t outmsg_q; /* poll/read wait queue */
Expand All @@ -46,7 +47,8 @@ struct hvutil_transport *hvutil_transport_init(const char *name,
u32 cn_idx, u32 cn_val,
int (*on_msg)(void *, int),
void (*on_reset)(void));
int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len);
int hvutil_transport_send(struct hvutil_transport *hvt, void *msg, int len,
void (*on_read_cb)(void));
void hvutil_transport_destroy(struct hvutil_transport *hvt);

#endif /* _HV_UTILS_TRANSPORT_H */

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