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From 66f0fbb6a54ab1110afd12eb9a25d8966b60c7fa Mon Sep 17 00:00:00 2001
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From: Michael S. Tsirkin <mst@redhat.com>
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Date: Wed, 14 May 2014 08:36:01 +0200
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Subject: [PATCH 19/31] usb: sanity check setup_index+setup_len in post_load
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RH-Author: Michael S. Tsirkin <mst@redhat.com>
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Message-id: <1400056525-6869-2-git-send-email-mst@redhat.com>
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Patchwork-id: 58865
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O-Subject: [PATCH qemu-kvm RHEL7.1 2/2] usb: sanity check setup_index+setup_len in post_load
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Bugzilla: 1095747
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RH-Acked-by: Marcel Apfelbaum <marcel.a@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
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CVE-2013-4541
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s->setup_len and s->setup_index are fed into usb_packet_copy as
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size/offset into s->data_buf, it's possible for invalid state to exploit
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this to load arbitrary data.
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setup_len and setup_index should be checked to make sure
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they are not negative.
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Cc: Gerd Hoffmann <kraxel@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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(cherry picked from commit 9f8e9895c504149d7048e9fc5eb5cbb34b16e49a)
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Brew build: http://brewweb.devel.redhat.com/brew/taskinfo?taskID=7452039
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Tested: lightly on developer's box
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Bugzilla: 1095743
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Note: the fix isn't complete upstream. there's a separate bugzilla to
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fix more issues upstream and in rhel.
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---
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hw/usb/bus.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/usb/bus.c | 4 +++-
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1 files changed, 3 insertions(+), 1 deletions(-)
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diff --git a/hw/usb/bus.c b/hw/usb/bus.c
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index e0c3a77..9766b7f 100644
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--- a/hw/usb/bus.c
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+++ b/hw/usb/bus.c
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@@ -49,7 +49,9 @@ static int usb_device_post_load(void *opaque, int version_id)
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} else {
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dev->attached = 1;
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}
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- if (dev->setup_index >= sizeof(dev->data_buf) ||
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+ if (dev->setup_index < 0 ||
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+ dev->setup_len < 0 ||
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+ dev->setup_index >= sizeof(dev->data_buf) ||
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dev->setup_len >= sizeof(dev->data_buf)) {
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return -EINVAL;
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}
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--
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1.7.1
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