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-rw-r--r--meta/recipes-devtools/qemu/qemu/CVE-2021-3527-1.patch42
1 files changed, 42 insertions, 0 deletions
diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2021-3527-1.patch b/meta/recipes-devtools/qemu/qemu/CVE-2021-3527-1.patch
new file mode 100644
index 0000000000..77a5385692
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2021-3527-1.patch
@@ -0,0 +1,42 @@
+From 05a40b172e4d691371534828078be47e7fff524c Mon Sep 17 00:00:00 2001
+From: Gerd Hoffmann <kraxel@redhat.com>
+Date: Mon, 3 May 2021 15:29:15 +0200
+Subject: [PATCH] usb: limit combined packets to 1 MiB (CVE-2021-3527)
+
+usb-host and usb-redirect try to batch bulk transfers by combining many
+small usb packets into a single, large transfer request, to reduce the
+overhead and improve performance.
+
+This patch adds a size limit of 1 MiB for those combined packets to
+restrict the host resources the guest can bind that way.
+
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+Message-Id: <20210503132915.2335822-6-kraxel@redhat.com>
+
+Upstream-Status: Backport
+https://gitlab.com/qemu-project/qemu/-/commit/05a40b172e4d691371534828078be47e7fff524c
+CVE: CVE-2021-3527
+Signed-off-by: Chee Yang Lee <chee.yang.lee@intel.com>
+
+---
+ hw/usb/combined-packet.c | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/hw/usb/combined-packet.c b/hw/usb/combined-packet.c
+index 5d57e883dc..e56802f89a 100644
+--- a/hw/usb/combined-packet.c
++++ b/hw/usb/combined-packet.c
+@@ -171,7 +171,9 @@ void usb_ep_combine_input_packets(USBEndpoint *ep)
+ if ((p->iov.size % ep->max_packet_size) != 0 || !p->short_not_ok ||
+ next == NULL ||
+ /* Work around for Linux usbfs bulk splitting + migration */
+- (totalsize == (16 * KiB - 36) && p->int_req)) {
++ (totalsize == (16 * KiB - 36) && p->int_req) ||
++ /* Next package may grow combined package over 1MiB */
++ totalsize > 1 * MiB - ep->max_packet_size) {
+ usb_device_handle_data(ep->dev, first);
+ assert(first->status == USB_RET_ASYNC);
+ if (first->combined) {
+--
+GitLab
+