* [dpdk-stable] [17.11 LTS PATCH] vhost: fix vring requests validation broken if no FD
@ 2019-11-14 15:16 Maxime Coquelin
2019-11-15 4:27 ` Tiwei Bie
0 siblings, 1 reply; 3+ messages in thread
From: Maxime Coquelin @ 2019-11-14 15:16 UTC (permalink / raw)
To: stable, tiwei.bie; +Cc: Zhike Wang, Maxime Coquelin
From: Zhike Wang <wangzk320@163.com>
When VHOST_USER_VRING_NOFD_MASK is set, the fd_num is 0,
so validate_msg_fds() will return error. In this case,
the negotiation of vring message between vhost user front end and
back end would fail, and as a result, vhost user link could NOT be up.
How to reproduce:
1.Run dpdk testpmd insides VM, which locates at host with ovs+dpdk.
2.Notice that inside ovs there are endless logs regarding failure to
handle VHOST_USER_SET_VRING_CALL, and link of vm could NOT be up.
Fixes: 1f6147d9a01f ("vhost: fix possible denial of service by leaking FDs")
Cc: stable@dpdk.org
Signed-off-by: Zhike Wang <wangzk320@163.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
Backport not tested yet.
lib/librte_vhost/vhost_user.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index d4643dc350..0f8e0df8c7 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -1409,6 +1409,7 @@ vhost_user_msg_handler(int vid, int fd)
struct VhostUserMsg msg;
int ret;
int unlock_required = 0;
+ int expected_fds;
dev = get_device(vid);
if (dev == NULL)
@@ -1586,12 +1587,16 @@ vhost_user_msg_handler(int vid, int fd)
break;
case VHOST_USER_SET_VRING_KICK:
- if (validate_msg_fds(&msg, 1) != 0)
+ expected_fds =
+ (msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
+ if (validate_msg_fds(&msg, expected_fds) != 0)
return -1;
vhost_user_set_vring_kick(&dev, &msg);
break;
case VHOST_USER_SET_VRING_CALL:
+ expected_fds =
+ (msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
if (validate_msg_fds(&msg, 1) != 0)
return -1;
@@ -1599,6 +1604,8 @@ vhost_user_msg_handler(int vid, int fd)
break;
case VHOST_USER_SET_VRING_ERR:
+ expected_fds =
+ (msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
if (validate_msg_fds(&msg, 1) != 0)
return -1;
--
2.21.0
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [dpdk-stable] [17.11 LTS PATCH] vhost: fix vring requests validation broken if no FD
2019-11-14 15:16 [dpdk-stable] [17.11 LTS PATCH] vhost: fix vring requests validation broken if no FD Maxime Coquelin
@ 2019-11-15 4:27 ` Tiwei Bie
2019-11-15 10:40 ` Maxime Coquelin
0 siblings, 1 reply; 3+ messages in thread
From: Tiwei Bie @ 2019-11-15 4:27 UTC (permalink / raw)
To: Maxime Coquelin; +Cc: stable, Zhike Wang
On Thu, Nov 14, 2019 at 04:16:15PM +0100, Maxime Coquelin wrote:
> From: Zhike Wang <wangzk320@163.com>
>
> When VHOST_USER_VRING_NOFD_MASK is set, the fd_num is 0,
> so validate_msg_fds() will return error. In this case,
> the negotiation of vring message between vhost user front end and
> back end would fail, and as a result, vhost user link could NOT be up.
>
> How to reproduce:
> 1.Run dpdk testpmd insides VM, which locates at host with ovs+dpdk.
> 2.Notice that inside ovs there are endless logs regarding failure to
> handle VHOST_USER_SET_VRING_CALL, and link of vm could NOT be up.
>
> Fixes: 1f6147d9a01f ("vhost: fix possible denial of service by leaking FDs")
> Cc: stable@dpdk.org
>
> Signed-off-by: Zhike Wang <wangzk320@163.com>
> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>
> Backport not tested yet.
>
> lib/librte_vhost/vhost_user.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
> index d4643dc350..0f8e0df8c7 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -1409,6 +1409,7 @@ vhost_user_msg_handler(int vid, int fd)
> struct VhostUserMsg msg;
> int ret;
> int unlock_required = 0;
> + int expected_fds;
>
> dev = get_device(vid);
> if (dev == NULL)
> @@ -1586,12 +1587,16 @@ vhost_user_msg_handler(int vid, int fd)
> break;
>
> case VHOST_USER_SET_VRING_KICK:
> - if (validate_msg_fds(&msg, 1) != 0)
> + expected_fds =
> + (msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
> + if (validate_msg_fds(&msg, expected_fds) != 0)
> return -1;
>
> vhost_user_set_vring_kick(&dev, &msg);
> break;
> case VHOST_USER_SET_VRING_CALL:
> + expected_fds =
> + (msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
> if (validate_msg_fds(&msg, 1) != 0)
Typo, s/1/expected_fds/
> return -1;
>
> @@ -1599,6 +1604,8 @@ vhost_user_msg_handler(int vid, int fd)
> break;
>
> case VHOST_USER_SET_VRING_ERR:
> + expected_fds =
> + (msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
> if (validate_msg_fds(&msg, 1) != 0)
Ditto.
Thanks,
Tiwei
> return -1;
>
> --
> 2.21.0
>
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [dpdk-stable] [17.11 LTS PATCH] vhost: fix vring requests validation broken if no FD
2019-11-15 4:27 ` Tiwei Bie
@ 2019-11-15 10:40 ` Maxime Coquelin
0 siblings, 0 replies; 3+ messages in thread
From: Maxime Coquelin @ 2019-11-15 10:40 UTC (permalink / raw)
To: Tiwei Bie; +Cc: stable, Zhike Wang
Thanks Tiwei!
Good catch, just posted the v2 for both 16.11 and 17.11.
Maxime
On 11/15/19 5:27 AM, Tiwei Bie wrote:
> On Thu, Nov 14, 2019 at 04:16:15PM +0100, Maxime Coquelin wrote:
>> From: Zhike Wang <wangzk320@163.com>
>>
>> When VHOST_USER_VRING_NOFD_MASK is set, the fd_num is 0,
>> so validate_msg_fds() will return error. In this case,
>> the negotiation of vring message between vhost user front end and
>> back end would fail, and as a result, vhost user link could NOT be up.
>>
>> How to reproduce:
>> 1.Run dpdk testpmd insides VM, which locates at host with ovs+dpdk.
>> 2.Notice that inside ovs there are endless logs regarding failure to
>> handle VHOST_USER_SET_VRING_CALL, and link of vm could NOT be up.
>>
>> Fixes: 1f6147d9a01f ("vhost: fix possible denial of service by leaking FDs")
>> Cc: stable@dpdk.org
>>
>> Signed-off-by: Zhike Wang <wangzk320@163.com>
>> Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>> ---
>>
>> Backport not tested yet.
>>
>> lib/librte_vhost/vhost_user.c | 9 ++++++++-
>> 1 file changed, 8 insertions(+), 1 deletion(-)
>>
>> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
>> index d4643dc350..0f8e0df8c7 100644
>> --- a/lib/librte_vhost/vhost_user.c
>> +++ b/lib/librte_vhost/vhost_user.c
>> @@ -1409,6 +1409,7 @@ vhost_user_msg_handler(int vid, int fd)
>> struct VhostUserMsg msg;
>> int ret;
>> int unlock_required = 0;
>> + int expected_fds;
>>
>> dev = get_device(vid);
>> if (dev == NULL)
>> @@ -1586,12 +1587,16 @@ vhost_user_msg_handler(int vid, int fd)
>> break;
>>
>> case VHOST_USER_SET_VRING_KICK:
>> - if (validate_msg_fds(&msg, 1) != 0)
>> + expected_fds =
>> + (msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
>> + if (validate_msg_fds(&msg, expected_fds) != 0)
>> return -1;
>>
>> vhost_user_set_vring_kick(&dev, &msg);
>> break;
>> case VHOST_USER_SET_VRING_CALL:
>> + expected_fds =
>> + (msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
>> if (validate_msg_fds(&msg, 1) != 0)
>
> Typo, s/1/expected_fds/
>
>> return -1;
>>
>> @@ -1599,6 +1604,8 @@ vhost_user_msg_handler(int vid, int fd)
>> break;
>>
>> case VHOST_USER_SET_VRING_ERR:
>> + expected_fds =
>> + (msg.payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
>> if (validate_msg_fds(&msg, 1) != 0)
>
> Ditto.
>
> Thanks,
> Tiwei
>
>> return -1;
>>
>> --
>> 2.21.0
>>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-11-14 15:16 [dpdk-stable] [17.11 LTS PATCH] vhost: fix vring requests validation broken if no FD Maxime Coquelin
2019-11-15 4:27 ` Tiwei Bie
2019-11-15 10:40 ` Maxime Coquelin
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