|
 |
6920d8 |
From 3ed3904f7411bd5896aebdfcc6fe202dbfc2eef6 Mon Sep 17 00:00:00 2001
|
|
|
6920d8 |
From: Gerd Hoffmann <kraxel@redhat.com>
|
|
|
6920d8 |
Date: Mon, 9 Apr 2018 13:27:36 +0200
|
|
|
6920d8 |
Subject: [PATCH 2/2] vga: fix region calculation
|
|
|
6920d8 |
|
|
|
6920d8 |
RH-Author: Gerd Hoffmann <kraxel@redhat.com>
|
|
|
6920d8 |
Message-id: <20180409132736.24598-3-kraxel@redhat.com>
|
|
|
6920d8 |
Patchwork-id: 79512
|
|
|
6920d8 |
O-Subject: [RHEL-7.5 qemu-kvm PATCH 2/2] vga: fix region calculation
|
|
|
6920d8 |
Bugzilla: 1567913
|
|
|
6920d8 |
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
|
|
6920d8 |
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
|
|
|
6920d8 |
RH-Acked-by: John Snow <jsnow@redhat.com>
|
|
|
6920d8 |
|
|
|
6920d8 |
Typically the scanline length and the line offset are identical. But
|
|
|
6920d8 |
in case they are not our calculation for region_end is incorrect. Using
|
|
|
6920d8 |
line_offset is fine for all scanlines, except the last one where we have
|
|
|
6920d8 |
to use the actual scanline length.
|
|
|
6920d8 |
|
|
|
6920d8 |
Fixes: CVE-2018-7550
|
|
|
6920d8 |
Reported-by: Ross Lagerwall <ross.lagerwall@citrix.com>
|
|
|
6920d8 |
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
|
|
|
6920d8 |
Reviewed-by: Prasad J Pandit <pjp@fedoraproject.org>
|
|
|
6920d8 |
Tested-by: Ross Lagerwall <ross.lagerwall@citrix.com>
|
|
|
6920d8 |
Message-id: 20180309143704.13420-1-kraxel@redhat.com
|
|
|
6920d8 |
(cherry picked from commit 7cdc61becd095b64a786b2625f321624e7111f3d)
|
|
|
6920d8 |
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
|
6920d8 |
---
|
|
|
6920d8 |
hw/display/vga.c | 2 ++
|
|
|
6920d8 |
1 file changed, 2 insertions(+)
|
|
|
6920d8 |
|
|
|
6920d8 |
diff --git a/hw/display/vga.c b/hw/display/vga.c
|
|
|
6920d8 |
index 8e6c6d6..9270a75 100644
|
|
|
6920d8 |
--- a/hw/display/vga.c
|
|
|
6920d8 |
+++ b/hw/display/vga.c
|
|
|
6920d8 |
@@ -1535,6 +1535,8 @@ static void vga_draw_graphic(VGACommonState *s, int full_update)
|
|
|
6920d8 |
|
|
|
6920d8 |
region_start = (s->start_addr * 4);
|
|
|
6920d8 |
region_end = region_start + (ram_addr_t)s->line_offset * height;
|
|
|
6920d8 |
+ region_end += width * s->get_bpp(s) / 8; /* scanline length */
|
|
|
6920d8 |
+ region_end -= s->line_offset;
|
|
|
6920d8 |
if (region_end > s->vbe_size) {
|
|
|
6920d8 |
/* wraps around (can happen with cirrus vbe modes) */
|
|
|
6920d8 |
region_start = 0;
|
|
|
6920d8 |
--
|
|
|
6920d8 |
1.8.3.1
|
|
|
6920d8 |
|