linux-kernel - [PATCH 4.4 9/9] vhost: make sure log_num < in

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Message-Id: <20190913130432.563420115@linuxfoundation.org>
Date:   Fri, 13 Sep 2019 14:06:59 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lidong Chen <lidongchen@...cent.com>,
        ruippan <ruippan@...cent.com>, yongduan <yongduan@...cent.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Tyler Hicks <tyhicks@...onical.com>
Subject: [PATCH 4.4 9/9] vhost: make sure log_num < in_num

From: yongduan <yongduan@...cent.com>

commit 060423bfdee3f8bc6e2c1bac97de24d5415e2bc4 upstream.

The code assumes log_num < in_num everywhere, and that is true as long as
in_num is incremented by descriptor iov count, and log_num by 1. However
this breaks if there's a zero sized descriptor.

As a result, if a malicious guest creates a vring desc with desc.len = 0,
it may cause the host kernel to crash by overflowing the log array. This
bug can be triggered during the VM migration.

There's no need to log when desc.len = 0, so just don't increment log_num
in this case.

Fixes: 3a4d5c94e959 ("vhost_net: a kernel-level virtio server")
Cc: stable@...r.kernel.org
Reviewed-by: Lidong Chen <lidongchen@...cent.com>
Signed-off-by: ruippan <ruippan@...cent.com>
Signed-off-by: yongduan <yongduan@...cent.com>
Acked-by: Michael S. Tsirkin <mst@...hat.com>
Reviewed-by: Tyler Hicks <tyhicks@...onical.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/vhost/vhost.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1324,7 +1324,7 @@ static int get_indirect(struct vhost_vir
 		/* If this is an input descriptor, increment that count. */
 		if (desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_WRITE)) {
 			*in_num += ret;
-			if (unlikely(log)) {
+			if (unlikely(log && ret)) {
 				log[*log_num].addr = vhost64_to_cpu(vq, desc.addr);
 				log[*log_num].len = vhost32_to_cpu(vq, desc.len);
 				++*log_num;
@@ -1453,7 +1453,7 @@ int vhost_get_vq_desc(struct vhost_virtq
 			/* If this is an input descriptor,
 			 * increment that count. */
 			*in_num += ret;
-			if (unlikely(log)) {
+			if (unlikely(log && ret)) {
 				log[*log_num].addr = vhost64_to_cpu(vq, desc.addr);
 				log[*log_num].len = vhost32_to_cpu(vq, desc.len);
 				++*log_num;