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qemu: backport patch for CVE-2021-4206

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CVE: CVE-2021-4206

Upstream fix:
https://git.qemu.org/?p=qemu.git;a=commit;h=fa892e9abb728e76afcf27323ab29c57fb0fe7aa

(From OE-Core rev: 0e684c12a762534261fcd7849fdcda0bb8031c0b)

Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Davide Gardenal
2022-05-16 10:54:15 +02:00
committed by Richard Purdie
parent cf9a7e4cc6
commit d6e618ac2e
2 changed files with 90 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
meta/recipes-devtools/qemu/qemu.inc
View File

@@ -33,6 +33,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
file://0001-vhost-vsock-detach-the-virqueue-element-in-case-of-e.patch \
file://0002-virtio-net-fix-map-leaking-on-error-during-receive.patch \
file://pvrdma.patch \
file://CVE-2021-4206.patch \
"
UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"

89
meta/recipes-devtools/qemu/qemu/CVE-2021-4206.patch Normal file
View File

@@ -0,0 +1,89 @@
From fa892e9abb728e76afcf27323ab29c57fb0fe7aa Mon Sep 17 00:00:00 2001
From: Mauro Matteo Cascella <mcascell@redhat.com>
Date: Thu, 7 Apr 2022 10:17:12 +0200
Subject: [PATCH] ui/cursor: fix integer overflow in cursor_alloc
(CVE-2021-4206)
MIME-Version: 1.0
Content-Type: text/plain; charset=utf8
Content-Transfer-Encoding: 8bit
Prevent potential integer overflow by limiting 'width' and 'height' to
512x512. Also change 'datasize' type to size_t. Refer to security
advisory https://starlabs.sg/advisories/22-4206/ for more information.
Fixes: CVE-2021-4206
Signed-off-by: Mauro Matteo Cascella <mcascell@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20220407081712.345609-1-mcascell@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Upstream-Status: Backport
https://git.qemu.org/?p=qemu.git;a=commit;h=fa892e9abb728e76afcf27323ab29c57fb0fe7aa
Signed-off-by: Davide Gardenal <davide.gardenal@huawei.com>
---
hw/display/qxl-render.c | 7 +++++++
hw/display/vmware_vga.c | 2 ++
ui/cursor.c | 8 +++++++-
3 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/hw/display/qxl-render.c b/hw/display/qxl-render.c
index 237ed29..ca21700 100644
--- a/hw/display/qxl-render.c
+++ b/hw/display/qxl-render.c
@@ -247,6 +247,13 @@ static QEMUCursor *qxl_cursor(PCIQXLDevice *qxl, QXLCursor *cursor,
size_t size;
c = cursor_alloc(cursor->header.width, cursor->header.height);
+
+ if (!c) {
+ qxl_set_guest_bug(qxl, "%s: cursor %ux%u alloc error", __func__,
+ cursor->header.width, cursor->header.height);
+ goto fail;
+ }
+
c->hot_x = cursor->header.hot_spot_x;
c->hot_y = cursor->header.hot_spot_y;
switch (cursor->header.type) {
diff --git a/hw/display/vmware_vga.c b/hw/display/vmware_vga.c
index 98c8347..45d06cb 100644
--- a/hw/display/vmware_vga.c
+++ b/hw/display/vmware_vga.c
@@ -515,6 +515,8 @@ static inline void vmsvga_cursor_define(struct vmsvga_state_s *s,
int i, pixels;
qc = cursor_alloc(c->width, c->height);
+ assert(qc != NULL);
+
qc->hot_x = c->hot_x;
qc->hot_y = c->hot_y;
switch (c->bpp) {
diff --git a/ui/cursor.c b/ui/cursor.c
index 1d62ddd..835f080 100644
--- a/ui/cursor.c
+++ b/ui/cursor.c
@@ -46,6 +46,8 @@ static QEMUCursor *cursor_parse_xpm(const char *xpm[])
/* parse pixel data */
c = cursor_alloc(width, height);
+ assert(c != NULL);
+
for (pixel = 0, y = 0; y < height; y++, line++) {
for (x = 0; x < height; x++, pixel++) {
idx = xpm[line][x];
@@ -91,7 +93,11 @@ QEMUCursor *cursor_builtin_left_ptr(void)
QEMUCursor *cursor_alloc(int width, int height)
{
QEMUCursor *c;
- int datasize = width * height * sizeof(uint32_t);
+ size_t datasize = width * height * sizeof(uint32_t);
+
+ if (width > 512 || height > 512) {
+ return NULL;
+ }
c = g_malloc0(sizeof(QEMUCursor) + datasize);
c->width = width;
--
1.8.3.1