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qemu: fix CVE-2020-13800

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(From OE-Core rev: 2c5f827b285c465fb6eb1d2aff9ec1f4e56cb202)

Signed-off-by: Sakib Sajal <sakib.sajal@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Sakib Sajal
2020-07-14 15:51:18 -04:00
committed by Richard Purdie
parent 10e2b84149
commit 11ea0bfdd1
2 changed files with 64 additions and 0 deletions
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1
meta/recipes-devtools/qemu/qemu.inc
View File

@@ -34,6 +34,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
file://CVE-2020-10761.patch \
file://CVE-2020-13362.patch \
file://CVE-2020-13659.patch \
file://CVE-2020-13800.patch \
"
UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"

63
meta/recipes-devtools/qemu/qemu/CVE-2020-13800.patch Normal file
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@@ -0,0 +1,63 @@
From a98610c429d52db0937c1e48659428929835c455 Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Thu, 4 Jun 2020 14:38:30 +0530
Subject: [PATCH] ati-vga: check mm_index before recursive call
(CVE-2020-13800)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
While accessing VGA registers via ati_mm_read/write routines,
a guest may set 's->regs.mm_index' such that it leads to infinite
recursion. Check mm_index value to avoid such recursion. Log an
error message for wrong values.
Reported-by: Ren Ding <rding@gatech.edu>
Reported-by: Hanqing Zhao <hanqing@gatech.edu>
Reported-by: Yi Ren <c4tren@gmail.com>
Message-id: 20200604090830.33885-1-ppandit@redhat.com
Suggested-by: BALATON Zoltan <balaton@eik.bme.hu>
Suggested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Upstream-Status: Backport [a98610c429d52db0937c1e48659428929835c455]
CVE: CVE-2020-13800
Signed-off-by: Sakib Sajal <sakib.sajal@windriver.com>
---
hw/display/ati.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/hw/display/ati.c b/hw/display/ati.c
index 065f197678..67604e68de 100644
--- a/hw/display/ati.c
+++ b/hw/display/ati.c
@@ -285,8 +285,11 @@ static uint64_t ati_mm_read(void *opaque, hwaddr addr, unsigned int size)
if (idx <= s->vga.vram_size - size) {
val = ldn_le_p(s->vga.vram_ptr + idx, size);
}
- } else {
+ } else if (s->regs.mm_index > MM_DATA + 3) {
val = ati_mm_read(s, s->regs.mm_index + addr - MM_DATA, size);
+ } else {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "ati_mm_read: mm_index too small: %u\n", s->regs.mm_index);
}
break;
case BIOS_0_SCRATCH ... BUS_CNTL - 1:
@@ -520,8 +523,11 @@ static void ati_mm_write(void *opaque, hwaddr addr,
if (idx <= s->vga.vram_size - size) {
stn_le_p(s->vga.vram_ptr + idx, size, data);
}
- } else {
+ } else if (s->regs.mm_index > MM_DATA + 3) {
ati_mm_write(s, s->regs.mm_index + addr - MM_DATA, data, size);
+ } else {
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "ati_mm_write: mm_index too small: %u\n", s->regs.mm_index);
}
break;
case BIOS_0_SCRATCH ... BUS_CNTL - 1:
--
2.20.1