From 362c829ba1931f91de4def5169570df525f4317d Mon Sep 17 00:00:00 2001 From: Ross Burton Date: Mon, 28 Mar 2022 11:46:39 +0100 Subject: qemu: backport fixes for CVE-2022-26353 and CVE-2022-26354 (From OE-Core rev: 73d3cb8cf089b66292c305973d85e14324f2022c) Signed-off-by: Ross Burton Signed-off-by: Alexandre Belloni Signed-off-by: Richard Purdie --- ...-detach-the-virqueue-element-in-case-of-e.patch | 60 ++++++++++++++++++++++ ...t-fix-map-leaking-on-error-during-receive.patch | 43 ++++++++++++++++ 2 files changed, 103 insertions(+) create mode 100644 meta/recipes-devtools/qemu/qemu/0001-vhost-vsock-detach-the-virqueue-element-in-case-of-e.patch create mode 100644 meta/recipes-devtools/qemu/qemu/0002-virtio-net-fix-map-leaking-on-error-during-receive.patch (limited to 'meta/recipes-devtools/qemu/qemu') diff --git a/meta/recipes-devtools/qemu/qemu/0001-vhost-vsock-detach-the-virqueue-element-in-case-of-e.patch b/meta/recipes-devtools/qemu/qemu/0001-vhost-vsock-detach-the-virqueue-element-in-case-of-e.patch new file mode 100644 index 0000000000..dcea9040c7 --- /dev/null +++ b/meta/recipes-devtools/qemu/qemu/0001-vhost-vsock-detach-the-virqueue-element-in-case-of-e.patch @@ -0,0 +1,60 @@ +CVE: CVE-2022-26354 +Upstream-Status: Backport +Signed-off-by: Ross Burton + +From 0190d651a73463dc2b8f170b29326d1f38140a04 Mon Sep 17 00:00:00 2001 +From: Stefano Garzarella +Date: Mon, 28 Feb 2022 10:50:58 +0100 +Subject: [PATCH 1/2] vhost-vsock: detach the virqueue element in case of error + +In vhost_vsock_common_send_transport_reset(), if an element popped from +the virtqueue is invalid, we should call virtqueue_detach_element() to +detach it from the virtqueue before freeing its memory. + +Fixes: fc0b9b0e1c ("vhost-vsock: add virtio sockets device") +Fixes: CVE-2022-26354 +Cc: qemu-stable@nongnu.org +Reported-by: VictorV +Signed-off-by: Stefano Garzarella +Message-Id: <20220228095058.27899-1-sgarzare@redhat.com> +Reviewed-by: Stefan Hajnoczi +Reviewed-by: Michael S. Tsirkin +Signed-off-by: Michael S. Tsirkin +--- + hw/virtio/vhost-vsock-common.c | 10 +++++++--- + 1 file changed, 7 insertions(+), 3 deletions(-) + +diff --git a/hw/virtio/vhost-vsock-common.c b/hw/virtio/vhost-vsock-common.c +index 3f3771274e..ed706681ac 100644 +--- a/hw/virtio/vhost-vsock-common.c ++++ b/hw/virtio/vhost-vsock-common.c +@@ -153,19 +153,23 @@ static void vhost_vsock_common_send_transport_reset(VHostVSockCommon *vvc) + if (elem->out_num) { + error_report("invalid vhost-vsock event virtqueue element with " + "out buffers"); +- goto out; ++ goto err; + } + + if (iov_from_buf(elem->in_sg, elem->in_num, 0, + &event, sizeof(event)) != sizeof(event)) { + error_report("vhost-vsock event virtqueue element is too short"); +- goto out; ++ goto err; + } + + virtqueue_push(vq, elem, sizeof(event)); + virtio_notify(VIRTIO_DEVICE(vvc), vq); + +-out: ++ g_free(elem); ++ return; ++ ++err: ++ virtqueue_detach_element(vq, elem, 0); + g_free(elem); + } + +-- +2.25.1 + diff --git a/meta/recipes-devtools/qemu/qemu/0002-virtio-net-fix-map-leaking-on-error-during-receive.patch b/meta/recipes-devtools/qemu/qemu/0002-virtio-net-fix-map-leaking-on-error-during-receive.patch new file mode 100644 index 0000000000..59ccfdd03c --- /dev/null +++ b/meta/recipes-devtools/qemu/qemu/0002-virtio-net-fix-map-leaking-on-error-during-receive.patch @@ -0,0 +1,43 @@ +CVE: CVE-2022-26353 +Upstream-Status: Backport +Signed-off-by: Ross Burton + +From 4d65ecbddd16f38a8cf23b3053ca5c3594f8d4a4 Mon Sep 17 00:00:00 2001 +From: Jason Wang +Date: Tue, 8 Mar 2022 10:42:51 +0800 +Subject: [PATCH 2/2] virtio-net: fix map leaking on error during receive + +Commit bedd7e93d0196 ("virtio-net: fix use after unmap/free for sg") +tries to fix the use after free of the sg by caching the virtqueue +elements in an array and unmap them at once after receiving the +packets, But it forgot to unmap the cached elements on error which +will lead to leaking of mapping and other unexpected results. + +Fixing this by detaching the cached elements on error. This addresses +CVE-2022-26353. + +Reported-by: Victor Tom +Cc: qemu-stable@nongnu.org +Fixes: CVE-2022-26353 +Fixes: bedd7e93d0196 ("virtio-net: fix use after unmap/free for sg") +Reviewed-by: Michael S. Tsirkin +Signed-off-by: Jason Wang +--- + hw/net/virtio-net.c | 1 + + 1 file changed, 1 insertion(+) + +diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c +index f2014d5ea0..e1f4748831 100644 +--- a/hw/net/virtio-net.c ++++ b/hw/net/virtio-net.c +@@ -1862,6 +1862,7 @@ static ssize_t virtio_net_receive_rcu(NetClientState *nc, const uint8_t *buf, + + err: + for (j = 0; j < i; j++) { ++ virtqueue_detach_element(q->rx_vq, elems[j], lens[j]); + g_free(elems[j]); + } + +-- +2.25.1 + -- cgit v1.2.3-54-g00ecf