From e7debf602633feb26227cdc8cc7fdd1b1b40946a Mon Sep 17 00:00:00 2001
From: Xuan Ding <xuan.ding@intel.com>
Date: Mon, 18 May 2020 14:17:04 +0100
Subject: [PATCH] vhost: fix potential fd leak
Vhost will create temporary file when receiving VHOST_USER_GET_INFLIGHT_FD
message. Malicious guest can send endless this message to drain out the
resource of host.
When receiving VHOST_USER_GET_INFLIGHT_FD message repeatedly, closing the
file created during the last handling of this message.
CVE-2020-10726
Fixes: d87f1a1cb7b666550 ("vhost: support inflight info sharing")
Cc: stable@dpdk.org
Signed-off-by: Xuan Ding <xuan.ding@intel.com>
Signed-off-by: Xiaolong Ye <xiaolong.ye@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
lib/librte_vhost/vhost_user.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 9d25490fb3..84bebad792 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -206,7 +206,7 @@ vhost_backend_cleanup(struct virtio_net *dev)
dev->inflight_info->addr = NULL;
}
- if (dev->inflight_info->fd > 0) {
+ if (dev->inflight_info->fd >= 0) {
close(dev->inflight_info->fd);
dev->inflight_info->fd = -1;
}
@@ -1417,6 +1417,7 @@ vhost_user_get_inflight_fd(struct virtio_net **pdev,
"failed to alloc dev inflight area\n");
return RTE_VHOST_MSG_RESULT_ERR;
}
+ dev->inflight_info->fd = -1;
}
num_queues = msg->payload.inflight.num_queues;
@@ -1447,6 +1448,11 @@ vhost_user_get_inflight_fd(struct virtio_net **pdev,
dev->inflight_info->addr = NULL;
}
+ if (dev->inflight_info->fd >= 0) {
+ close(dev->inflight_info->fd);
+ dev->inflight_info->fd = -1;
+ }
+
dev->inflight_info->addr = addr;
dev->inflight_info->size = msg->payload.inflight.mmap_size = mmap_size;
dev->inflight_info->fd = msg->fds[0] = fd;
@@ -1529,6 +1535,7 @@ vhost_user_set_inflight_fd(struct virtio_net **pdev, VhostUserMsg *msg,
"failed to alloc dev inflight area\n");
return RTE_VHOST_MSG_RESULT_ERR;
}
+ dev->inflight_info->fd = -1;
}
if (dev->inflight_info->addr) {
@@ -1543,8 +1550,10 @@ vhost_user_set_inflight_fd(struct virtio_net **pdev, VhostUserMsg *msg,
return RTE_VHOST_MSG_RESULT_ERR;
}
- if (dev->inflight_info->fd)
+ if (dev->inflight_info->fd >= 0) {
close(dev->inflight_info->fd);
+ dev->inflight_info->fd = -1;
+ }
dev->inflight_info->fd = fd;
dev->inflight_info->addr = addr;
--
2.39.5