c57c3c69e6
- usb: unbounded stack allocation in usbredir (bsc#1186012, CVE-2021-3527) hw-usb-Do-not-build-USB-subsystem-if-not.patch hw-usb-host-stub-Remove-unused-header.patch usb-hid-avoid-dynamic-stack-allocation.patch usb-limit-combined-packets-to-1-MiB-CVE-.patch usb-mtp-avoid-dynamic-stack-allocation.patch - usbredir: free call on invalid pointer in bufp_alloc (bsc#1189145, CVE-2021-3682) usbredir-fix-free-call.patch OBS-URL: https://build.opensuse.org/request/show/911318 OBS-URL: https://build.opensuse.org/package/show/Virtualization/qemu?expand=0&rev=664
37 lines
1.6 KiB
Diff
37 lines
1.6 KiB
Diff
From: Gerd Hoffmann <kraxel@redhat.com>
|
|
Date: Mon, 3 May 2021 15:29:15 +0200
|
|
Subject: usb: limit combined packets to 1 MiB (CVE-2021-3527)
|
|
|
|
Git-commit: 05a40b172e4d691371534828078be47e7fff524c
|
|
References: bsc#1186012, 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>
|
|
Signed-off-by: Jose R. Ziviani <jziviani@suse.de>
|
|
---
|
|
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 5d57e883dcb515c9b8acc58d97b4..e56802f89a32f44bc94f3b3dbda2 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) {
|