qemu: fix CVE-2020-24352

(From OE-Core rev: 12bee66a42a7c2a38789ddb37cb098bcbf0b3841)

Signed-off-by: Lee Chee Yang <chee.yang.lee@intel.com>
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 52 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2020-24352.patch b/meta/recipes-devtools/qemu/qemu/CVE-2020-24352.patch
new file mode 100644
index 0000000000..861ff6c3b0
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2020-24352.patch
@@ -0,0 +1,52 @@
+From ca1f9cbfdce4d63b10d57de80fef89a89d92a540 Mon Sep 17 00:00:00 2001
+From: Prasad J Pandit <pjp@fedoraproject.org>
+Date: Wed, 21 Oct 2020 16:08:18 +0530
+Subject: [PATCH 1/1] ati: check x y display parameter values
+
+The source and destination x,y display parameters in ati_2d_blt()
+may run off the vga limits if either of s->regs.[src|dst]_[xy] is
+zero. Check the parameter values to avoid potential crash.
+
+Reported-by: Gaoning Pan <pgn@zju.edu.cn>
+Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
+Message-id: 20201021103818.1704030-1-ppandit@redhat.com
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+
+Upstream-Status: Backport [ https://git.qemu.org/?p=qemu.git;a=commitdiff;h=ca1f9cbfdce4d63b10d57de80fef89a89d92a540;hp=2ddafce7f797082ad216657c830afd4546f16e37 ]
+CVE: CVE-2020-24352
+Signed-off-by: Chee Yang Lee <chee.yang.lee@intel.com>
+---
+ hw/display/ati_2d.c | 10 ++++++----
+ 1 file changed, 6 insertions(+), 4 deletions(-)
+
+diff --git a/hw/display/ati_2d.c b/hw/display/ati_2d.c
+index 23a8ae0..4dc10ea 100644
+--- a/hw/display/ati_2d.c
++++ b/hw/display/ati_2d.c
+@@ -75,8 +75,9 @@ void ati_2d_blt(ATIVGAState *s)
+         dst_stride *= bpp;
+     }
+     uint8_t *end = s->vga.vram_ptr + s->vga.vram_size;
+-    if (dst_bits >= end || dst_bits + dst_x + (dst_y + s->regs.dst_height) *
+-        dst_stride >= end) {
++    if (dst_x > 0x3fff || dst_y > 0x3fff || dst_bits >= end
++        || dst_bits + dst_x
++         + (dst_y + s->regs.dst_height) * dst_stride >= end) {
+         qemu_log_mask(LOG_UNIMP, "blt outside vram not implemented\n");
+         return;
+     }
+@@ -107,8 +108,9 @@ void ati_2d_blt(ATIVGAState *s)
+             src_bits += s->regs.crtc_offset & 0x07ffffff;
+             src_stride *= bpp;
+         }
+-        if (src_bits >= end || src_bits + src_x +
+-            (src_y + s->regs.dst_height) * src_stride >= end) {
++        if (src_x > 0x3fff || src_y > 0x3fff || src_bits >= end
++            || src_bits + src_x
++             + (src_y + s->regs.dst_height) * src_stride >= end) {
+             qemu_log_mask(LOG_UNIMP, "blt outside vram not implemented\n");
+             return;
+         }
+-- 
+1.8.3.1
+