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CVE-2014-0055 vhost-net: insufficent error handling in get_rx_bufs (rhbz 1062577 1081503)

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This commit is contained in:
Josh Boyer 2014-03-28 11:17:27 -04:00
parent 0fc5fab4f7
commit 6676648289
2 changed files with 62 additions and 0 deletions
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7
kernel.spec
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@ -645,6 +645,9 @@ Patch25044: iwlwifi-dvm-take-mutex-when-sending-SYNC-BT-config-command.patch
#CVE-2014-2568 rhbz 1079012 1079013
Patch25049: core-nfqueue-openvswitch-Orphan-frags-in-skb_zerocopy-and-handle-errors.patch
#CVE-2014-0055 rhbz 1062577 1081503
Patch25050: net-vhost-validate-vhost_get_vq_desc-return-value.patch
# END OF PATCH DEFINITIONS
%endif
@ -1295,6 +1298,9 @@ ApplyPatch iwlwifi-dvm-take-mutex-when-sending-SYNC-BT-config-command.patch
#CVE-2014-2568 rhbz 1079012 1079013
ApplyPatch core-nfqueue-openvswitch-Orphan-frags-in-skb_zerocopy-and-handle-errors.patch
#CVE-2014-0055 rhbz 1062577 1081503
ApplyPatch net-vhost-validate-vhost_get_vq_desc-return-value.patch
# END OF PATCH APPLICATIONS
%endif
@ -2075,6 +2081,7 @@ fi
# || ||
%changelog
* Fri Mar 28 2014 Josh Boyer <jwboyer@fedoraproject.org>
- CVE-2014-0055 vhost-net: insufficent error handling in get_rx_bufs (rhbz 1062577 1081503)
- CVE-2014-2568 net: potential info leak when ubuf backed skbs are zero copied (rhbz 1079012 1079013)
* Fri Mar 28 2014 Josh Boyer <jwboyer@fedoraproject.org> - 3.14.0-0.rc8.git1.1

55
net-vhost-validate-vhost_get_vq_desc-return-value.patch Normal file
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@ -0,0 +1,55 @@
Bugzilla: 1081503
Upstream-status: Sent to netdev
From patchwork Thu Mar 27 10:53:37 2014
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: [net] vhost: validate vhost_get_vq_desc return value
From: "Michael S. Tsirkin" <mst@redhat.com>
X-Patchwork-Id: 334291
Message-Id: <1395917517-30937-1-git-send-email-mst@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: kvm@vger.kernel.org, virtio-dev@lists.oasis-open.org,
virtualization@lists.linux-foundation.org, netdev@vger.kernel.org,
David Miller <davem@davemloft.net>, Jason Wang <jasowang@redhat.com>
Date: Thu, 27 Mar 2014 12:53:37 +0200
vhost fails to validate negative error code
from vhost_get_vq_desc causing
a crash: we are using -EFAULT which is 0xfffffff2
as vector size, which exceeds the allocated size.
The code in question was introduced in commit
8dd014adfea6f173c1ef6378f7e5e7924866c923
vhost-net: mergeable buffers support
CVE-2014-0055
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
This is needed in -stable.
drivers/vhost/net.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 026be58..e1e22e0 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -505,9 +505,13 @@ static int get_rx_bufs(struct vhost_virtqueue *vq,
r = -ENOBUFS;
goto err;
}
- d = vhost_get_vq_desc(vq->dev, vq, vq->iov + seg,
+ r = vhost_get_vq_desc(vq->dev, vq, vq->iov + seg,
ARRAY_SIZE(vq->iov) - seg, &out,
&in, log, log_num);
+ if (unlikely(r < 0))
+ goto err;
+
+ d = r;
if (d == vq->num) {
r = 0;
goto err;