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[PATCH net-next] hv_netvsc: Fix race condition on Multi-Send Data field

Started byHaiyang Zhang <haiyangz@microsoft.com>
First post2015-12-10 20:00 +0100
Last post2015-12-11 17:10 +0100
Articles 5 — 3 participants

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  [PATCH net-next] hv_netvsc: Fix race condition on Multi-Send Data field Haiyang Zhang <haiyangz@microsoft.com> - 2015-12-10 20:00 +0100
    Re: [PATCH net-next] hv_netvsc: Fix race condition on Multi-Send Data field Vitaly Kuznetsov <vkuznets@redhat.com> - 2015-12-11 13:40 +0100
      Re: [PATCH net-next] hv_netvsc: Fix race condition on Multi-Send Data field Vitaly Kuznetsov <vkuznets@redhat.com> - 2015-12-11 15:00 +0100
        RE: [PATCH net-next] hv_netvsc: Fix race condition on Multi-Send Data  field Haiyang Zhang <haiyangz@microsoft.com> - 2015-12-11 17:00 +0100
        RE: [PATCH net-next] hv_netvsc: Fix race condition on Multi-Send Data  field KY Srinivasan <kys@microsoft.com> - 2015-12-11 17:10 +0100

#1288845 — [PATCH net-next] hv_netvsc: Fix race condition on Multi-Send Data field

FromHaiyang Zhang <haiyangz@microsoft.com>
Date2015-12-10 20:00 +0100
Subject[PATCH net-next] hv_netvsc: Fix race condition on Multi-Send Data field
Message-ID<qEeBD-1xO-93@gated-at.bofh.it>
In commit 2a04ae8acb14 ("hv_netvsc: remove locking in netvsc_send()"), the
locking for MSD (Multi-Send Data) field was removed. This could cause a
race condition between RNDIS control messages and data packets processing,
because these two types of traffic are not synchronized.
This patch fixes this issue by sending control messages out directly
without reading MSD field.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
---
 drivers/net/hyperv/netvsc.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 02bab9a..059fc52 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -867,6 +867,14 @@ int netvsc_send(struct hv_device *device,
 	packet->send_buf_index = NETVSC_INVALID_INDEX;
 	packet->cp_partial = false;
 
+	/* Send control message directly without accessing msd (Multi-Send
+	 * Data) field which may be changed during data packet processing.
+	 */
+	if (!skb) {
+		cur_send = packet;
+		goto send_now;
+	}
+
 	msdp = &net_device->msd[q_idx];
 
 	/* batch packets in send buffer if possible */
@@ -939,6 +947,7 @@ int netvsc_send(struct hv_device *device,
 		}
 	}
 
+send_now:
 	if (cur_send)
 		ret = netvsc_send_pkt(cur_send, net_device, pb, skb);
 
-- 
1.7.4.1

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#1289522

FromVitaly Kuznetsov <vkuznets@redhat.com>
Date2015-12-11 13:40 +0100
Message-ID<qEv9o-4hC-17@gated-at.bofh.it>
In reply to#1288845

[Multipart message — attachments visible in raw view] — view raw

Haiyang Zhang <haiyangz@microsoft.com> writes:

> In commit 2a04ae8acb14 ("hv_netvsc: remove locking in netvsc_send()"), the
> locking for MSD (Multi-Send Data) field was removed. This could cause a
> race condition between RNDIS control messages and data packets processing,
> because these two types of traffic are not synchronized.
> This patch fixes this issue by sending control messages out directly
> without reading MSD field.
>
> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
> ---
>  drivers/net/hyperv/netvsc.c |    9 +++++++++
>  1 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
> index 02bab9a..059fc52 100644
> --- a/drivers/net/hyperv/netvsc.c
> +++ b/drivers/net/hyperv/netvsc.c
> @@ -867,6 +867,14 @@ int netvsc_send(struct hv_device *device,
>  	packet->send_buf_index = NETVSC_INVALID_INDEX;
>  	packet->cp_partial = false;
>  
> +	/* Send control message directly without accessing msd (Multi-Send
> +	 * Data) field which may be changed during data packet processing.
> +	 */
> +	if (!skb) {
> +		cur_send = packet;
> +		goto send_now;
> +	}
> +

Is is supposed to be applied on top of some other patches? It doesn't
compile on top of current net-next:

drivers/net/hyperv/netvsc.c: In function ‘netvsc_send’:
drivers/net/hyperv/netvsc.c:865:7: error: ‘skb’ undeclared (first use in
this function)
  if (!skb) {
         ^
         
Did you mean to check rndis_msg instead (as skb is not defined here)?

>  	msdp = &net_device->msd[q_idx];
>  
>  	/* batch packets in send buffer if possible */
> @@ -939,6 +947,7 @@ int netvsc_send(struct hv_device *device,
>  		}
>  	}
>  
> +send_now:
>  	if (cur_send)
>  		ret = netvsc_send_pkt(cur_send, net_device, pb, skb);

I suppose we untangle these two pathes completely: let
rndis_filter_send_request() call netvsc_send_pkt() directly. Please see
my patch attached (note: it should be split in 3 patches if
submitted). If you like the idea I can send it.

-- 
  Vitaly

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#1289588

FromVitaly Kuznetsov <vkuznets@redhat.com>
Date2015-12-11 15:00 +0100
Message-ID<qEwoO-5c5-1@gated-at.bofh.it>
In reply to#1289522
Vitaly Kuznetsov <vkuznets@redhat.com> writes:

> Haiyang Zhang <haiyangz@microsoft.com> writes:
>
>> In commit 2a04ae8acb14 ("hv_netvsc: remove locking in netvsc_send()"), the
>> locking for MSD (Multi-Send Data) field was removed. This could cause a
>> race condition between RNDIS control messages and data packets processing,
>> because these two types of traffic are not synchronized.
>> This patch fixes this issue by sending control messages out directly
>> without reading MSD field.
>>
>> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
>> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
>> ---
>>  drivers/net/hyperv/netvsc.c |    9 +++++++++
>>  1 files changed, 9 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
>> index 02bab9a..059fc52 100644
>> --- a/drivers/net/hyperv/netvsc.c
>> +++ b/drivers/net/hyperv/netvsc.c
>> @@ -867,6 +867,14 @@ int netvsc_send(struct hv_device *device,
>>  	packet->send_buf_index = NETVSC_INVALID_INDEX;
>>  	packet->cp_partial = false;
>>  
>> +	/* Send control message directly without accessing msd (Multi-Send
>> +	 * Data) field which may be changed during data packet processing.
>> +	 */
>> +	if (!skb) {
>> +		cur_send = packet;
>> +		goto send_now;
>> +	}
>> +
>
> Is is supposed to be applied on top of some other patches? It doesn't
> compile on top of current net-next:
>
> drivers/net/hyperv/netvsc.c: In function ‘netvsc_send’:
> drivers/net/hyperv/netvsc.c:865:7: error: ‘skb’ undeclared (first use in
> this function)
>   if (!skb) {
>          ^
>
> Did you mean to check rndis_msg instead (as skb is not defined here)?

Oh, my bad, it was me who was looking at the wrong branch... Sorry for
the noise.

>
>>  	msdp = &net_device->msd[q_idx];
>>  
>>  	/* batch packets in send buffer if possible */
>> @@ -939,6 +947,7 @@ int netvsc_send(struct hv_device *device,
>>  		}
>>  	}
>>  
>> +send_now:
>>  	if (cur_send)
>>  		ret = netvsc_send_pkt(cur_send, net_device, pb, skb);
>
> I suppose we untangle these two pathes completely: let
> rndis_filter_send_request() call netvsc_send_pkt() directly. Please see
> my patch attached (note: it should be split in 3 patches if
> submitted). If you like the idea I can send it.

This patch will need some changes but the suggestion still stands: let's
untangle sending data and control messages.

-- 
  Vitaly
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#1289697 — RE: [PATCH net-next] hv_netvsc: Fix race condition on Multi-Send Data field

FromHaiyang Zhang <haiyangz@microsoft.com>
Date2015-12-11 17:00 +0100
SubjectRE: [PATCH net-next] hv_netvsc: Fix race condition on Multi-Send Data field
Message-ID<qEygX-6sM-29@gated-at.bofh.it>
In reply to#1289588
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#1289704 — RE: [PATCH net-next] hv_netvsc: Fix race condition on Multi-Send Data field

FromKY Srinivasan <kys@microsoft.com>
Date2015-12-11 17:10 +0100
SubjectRE: [PATCH net-next] hv_netvsc: Fix race condition on Multi-Send Data field
Message-ID<qEyqC-6Ls-29@gated-at.bofh.it>
In reply to#1289588
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