patch 'vhost: fix unsafe vring addresses modifications' has been queued to stable release 20.11.5

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.5

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 03/02/22. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/bluca/dpdk-stable

This queued commit can be viewed at:
https://github.com/bluca/dpdk-stable/commit/33f2e375618602da76c84d408876edd34c179740

Thanks.

Luca Boccassi

---
>From 33f2e375618602da76c84d408876edd34c179740 Mon Sep 17 00:00:00 2001
From: Maxime Coquelin <maxime.coquelin at redhat.com>
Date: Thu, 27 Jan 2022 12:09:53 +0100
Subject: [PATCH] vhost: fix unsafe vring addresses modifications

[ upstream commit 04c27cb673b983ce2580731c0afc4b0e815fd658 ]

This patch adds missing protection around vring_invalidate
and translate_ring_addresses calls in vhost_user_iotlb_msg.

Fixes: eefac9536a90 ("vhost: postpone device creation until rings are mapped")

Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
Reviewed-by: Chenbo Xia <chenbo.xia at intel.com>
Reviewed-by: David Marchand <david.marchand at redhat.com>
---
 lib/librte_vhost/vhost_user.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 0ee54def9c..11d58113a7 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -2379,8 +2379,11 @@ vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg,
 			vhost_user_iotlb_cache_insert(vq, imsg->iova, vva,
 					len, imsg->perm);
 
-			if (is_vring_iotlb(dev, vq, imsg))
+			if (is_vring_iotlb(dev, vq, imsg)) {
+				rte_spinlock_lock(&vq->access_lock);
 				*pdev = dev = translate_ring_addresses(dev, i);
+				rte_spinlock_unlock(&vq->access_lock);
+			}
 		}
 		break;
 	case VHOST_IOTLB_INVALIDATE:
@@ -2393,8 +2396,11 @@ vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg,
 			vhost_user_iotlb_cache_remove(vq, imsg->iova,
 					imsg->size);
 
-			if (is_vring_iotlb(dev, vq, imsg))
+			if (is_vring_iotlb(dev, vq, imsg)) {
+				rte_spinlock_lock(&vq->access_lock);
 				vring_invalidate(dev, vq);
+				rte_spinlock_unlock(&vq->access_lock);
+			}
 		}
 		break;
 	default:
-- 
2.30.2

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2022-02-28 21:17:56.055035138 +0000
+++ 0026-vhost-fix-unsafe-vring-addresses-modifications.patch	2022-02-28 21:17:53.912930808 +0000
@@ -1 +1 @@
-From 04c27cb673b983ce2580731c0afc4b0e815fd658 Mon Sep 17 00:00:00 2001
+From 33f2e375618602da76c84d408876edd34c179740 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit 04c27cb673b983ce2580731c0afc4b0e815fd658 ]
+
@@ -10 +11,0 @@
-Cc: stable at dpdk.org
@@ -16 +17 @@
- lib/vhost/vhost_user.c | 10 ++++++++--
+ lib/librte_vhost/vhost_user.c | 10 ++++++++--
@@ -19,6 +20,6 @@
-diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c
-index 8ee9c3e2db..723c6890c3 100644
---- a/lib/vhost/vhost_user.c
-+++ b/lib/vhost/vhost_user.c
-@@ -2564,8 +2564,11 @@ vhost_user_iotlb_msg(struct virtio_net **pdev,
- 			vhost_user_iotlb_cache_insert(dev, vq, imsg->iova, vva,
+diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
+index 0ee54def9c..11d58113a7 100644
+--- a/lib/librte_vhost/vhost_user.c
++++ b/lib/librte_vhost/vhost_user.c
+@@ -2379,8 +2379,11 @@ vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg,
+ 			vhost_user_iotlb_cache_insert(vq, imsg->iova, vva,
@@ -36 +37 @@
-@@ -2578,8 +2581,11 @@ vhost_user_iotlb_msg(struct virtio_net **pdev,
+@@ -2393,8 +2396,11 @@ vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg,