Linux v5.2-rc3-24-g788a024921c4

1 files changed, 0 insertions, 200 deletions

diff --git a/net-vhost_net-fix-possible-infinite-loop.patch b/net-vhost_net-fix-possible-infinite-loop.patch
deleted file mode 100644
index f45d84bb2..000000000
--- a/net-vhost_net-fix-possible-infinite-loop.patch
+++ /dev/null
@@ -1,200 +0,0 @@
-From patchwork Thu Apr 25 07:33:19 2019
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-X-Patchwork-Id: 10916185
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-Cc: ppandit@redhat.com
-Subject: [PATCH net] vhost_net: fix possible infinite loop
-Date: Thu, 25 Apr 2019 03:33:19 -0400
-Message-Id: <1556177599-56248-1-git-send-email-jasowang@redhat.com>
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-
-When the rx buffer is too small for a packet, we will discard the vq
-descriptor and retry it for the next packet:
-
-while ((sock_len = vhost_net_rx_peek_head_len(net, sock->sk,
-					      &busyloop_intr))) {
-...
-	/* On overrun, truncate and discard */
-	if (unlikely(headcount > UIO_MAXIOV)) {
-		iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1);
-		err = sock->ops->recvmsg(sock, &msg,
-					 1, MSG_DONTWAIT | MSG_TRUNC);
-		pr_debug("Discarded rx packet: len %zd\n", sock_len);
-		continue;
-	}
-...
-}
-
-This makes it possible to trigger a infinite while..continue loop
-through the co-opreation of two VMs like:
-
-1) Malicious VM1 allocate 1 byte rx buffer and try to slow down the
-   vhost process as much as possible e.g using indirect descriptors or
-   other.
-2) Malicious VM2 generate packets to VM1 as fast as possible
-
-Fixing this by checking against weight at the end of RX and TX
-loop. This also eliminate other similar cases when:
-
-- userspace is consuming the packets in the meanwhile
-- theoretical TOCTOU attack if guest moving avail index back and forth
-  to hit the continue after vhost find guest just add new buffers
-
-This addresses CVE-2019-3900.
-
-Fixes: d8316f3991d20 ("vhost: fix total length when packets are too short")
-Fixes: 3a4d5c94e9593 ("vhost_net: a kernel-level virtio server")
-Signed-off-by: Jason Wang <jasowang@redhat.com>
----
- drivers/vhost/net.c | 41 +++++++++++++++++++++--------------------
- 1 file changed, 21 insertions(+), 20 deletions(-)
-
-diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
-index df51a35..fb46e6b 100644
---- a/drivers/vhost/net.c
-+++ b/drivers/vhost/net.c
-@@ -778,8 +778,9 @@ static void handle_tx_copy(struct vhost_net *net, struct socket *sock)
- 	int err;
- 	int sent_pkts = 0;
- 	bool sock_can_batch = (sock->sk->sk_sndbuf == INT_MAX);
-+	bool next_round = false;
- 
--	for (;;) {
-+	do {
- 		bool busyloop_intr = false;
- 
- 		if (nvq->done_idx == VHOST_NET_BATCH)
-@@ -845,11 +846,10 @@ static void handle_tx_copy(struct vhost_net *net, struct socket *sock)
- 		vq->heads[nvq->done_idx].id = cpu_to_vhost32(vq, head);
- 		vq->heads[nvq->done_idx].len = 0;
- 		++nvq->done_idx;
--		if (vhost_exceeds_weight(++sent_pkts, total_len)) {
--			vhost_poll_queue(&vq->poll);
--			break;
--		}
--	}
-+	} while (!(next_round = vhost_exceeds_weight(++sent_pkts, total_len)));
-+
-+	if (next_round)
-+		vhost_poll_queue(&vq->poll);
- 
- 	vhost_tx_batch(net, nvq, sock, &msg);
- }
-@@ -873,8 +873,9 @@ static void handle_tx_zerocopy(struct vhost_net *net, struct socket *sock)
- 	struct vhost_net_ubuf_ref *uninitialized_var(ubufs);
- 	bool zcopy_used;
- 	int sent_pkts = 0;
-+	bool next_round = false;
- 
--	for (;;) {
-+	do {
- 		bool busyloop_intr;
- 
- 		/* Release DMAs done buffers first */
-@@ -951,11 +952,10 @@ static void handle_tx_zerocopy(struct vhost_net *net, struct socket *sock)
- 		else
- 			vhost_zerocopy_signal_used(net, vq);
- 		vhost_net_tx_packet(net);
--		if (unlikely(vhost_exceeds_weight(++sent_pkts, total_len))) {
--			vhost_poll_queue(&vq->poll);
--			break;
--		}
--	}
-+	} while (!(next_round = vhost_exceeds_weight(++sent_pkts, total_len)));
-+
-+	if (next_round)
-+		vhost_poll_queue(&vq->poll);
- }
- 
- /* Expects to be always run from workqueue - which acts as
-@@ -1134,6 +1134,7 @@ static void handle_rx(struct vhost_net *net)
- 	struct iov_iter fixup;
- 	__virtio16 num_buffers;
- 	int recv_pkts = 0;
-+	bool next_round = false;
- 
- 	mutex_lock_nested(&vq->mutex, VHOST_NET_VQ_RX);
- 	sock = vq->private_data;
-@@ -1153,8 +1154,11 @@ static void handle_rx(struct vhost_net *net)
- 		vq->log : NULL;
- 	mergeable = vhost_has_feature(vq, VIRTIO_NET_F_MRG_RXBUF);
- 
--	while ((sock_len = vhost_net_rx_peek_head_len(net, sock->sk,
--						      &busyloop_intr))) {
-+	do {
-+		sock_len = vhost_net_rx_peek_head_len(net, sock->sk,
-+						      &busyloop_intr);
-+		if (!sock_len)
-+			break;
- 		sock_len += sock_hlen;
- 		vhost_len = sock_len + vhost_hlen;
- 		headcount = get_rx_bufs(vq, vq->heads + nvq->done_idx,
-@@ -1239,12 +1243,9 @@ static void handle_rx(struct vhost_net *net)
- 			vhost_log_write(vq, vq_log, log, vhost_len,
- 					vq->iov, in);
- 		total_len += vhost_len;
--		if (unlikely(vhost_exceeds_weight(++recv_pkts, total_len))) {
--			vhost_poll_queue(&vq->poll);
--			goto out;
--		}
--	}
--	if (unlikely(busyloop_intr))
-+	} while (!(next_round = vhost_exceeds_weight(++recv_pkts, total_len)));
-+
-+	if (unlikely(busyloop_intr || next_round))
- 		vhost_poll_queue(&vq->poll);
- 	else
- 		vhost_net_enable_vq(net, vq);