rpms/kvm/F-8 kvm-cirrus-bitblt-overflow.patch, NONE, 1.1 kvm.spec, 1.33, 1.34
Glauber Costa (glommer)
fedora-extras-commits at redhat.com
Tue May 27 13:27:01 UTC 2008
Author: glommer
Update of /cvs/pkgs/rpms/kvm/F-8
In directory cvs-int.fedora.redhat.com:/tmp/cvs-serv29737
Modified Files:
kvm.spec
Added Files:
kvm-cirrus-bitblt-overflow.patch
Log Message:
* Tue May 27 2008 Glauber Costa <gcosta at redhat.com> - 60-6.fc8
- Fix Cirrus heap overflow vulnerability (#448525)
kvm-cirrus-bitblt-overflow.patch:
--- NEW FILE kvm-cirrus-bitblt-overflow.patch ---
commit b2eb849d4b1fdb6f35d5c46958c7f703cf64cfef
Author: aurel32 <aurel32 at c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Mon May 5 21:26:31 2008 +0000
CVE-2007-1320 - Cirrus LGD-54XX "bitblt" heap overflow
I have just noticed that patch for CVE-2007-1320 has never been applied
to the QEMU CVS. Please find it below.
| Multiple heap-based buffer overflows in the cirrus_invalidate_region
| function in the Cirrus VGA extension in QEMU 0.8.2, as used in Xen and
| possibly other products, might allow local users to execute arbitrary
| code via unspecified vectors related to "attempting to mark
| non-existent regions as dirty," aka the "bitblt" heap overflow.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4340 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/qemu/hw/cirrus_vga.c b/hw/cirrus_vga.c
index 07e52b0..47acb32 100644
--- a/qemu/hw/cirrus_vga.c
+++ b/qemu/hw/cirrus_vga.c
@@ -220,6 +220,20 @@
#define CIRRUS_HOOK_NOT_HANDLED 0
#define CIRRUS_HOOK_HANDLED 1
+#define BLTUNSAFE(s) \
+ ( \
+ ( /* check dst is within bounds */ \
+ (s)->cirrus_blt_height * (s)->cirrus_blt_dstpitch \
+ + ((s)->cirrus_blt_dstaddr & (s)->cirrus_addr_mask) > \
+ (s)->vram_size \
+ ) || \
+ ( /* check src is within bounds */ \
+ (s)->cirrus_blt_height * (s)->cirrus_blt_srcpitch \
+ + ((s)->cirrus_blt_srcaddr & (s)->cirrus_addr_mask) > \
+ (s)->vram_size \
+ ) \
+ )
+
struct CirrusVGAState;
typedef void (*cirrus_bitblt_rop_t) (struct CirrusVGAState *s,
uint8_t * dst, const uint8_t * src,
@@ -639,7 +653,7 @@ static void cirrus_invalidate_region(CirrusVGAState * s, int off_begin,
for (y = 0; y < lines; y++) {
off_cur = off_begin;
- off_cur_end = off_cur + bytesperline;
+ off_cur_end = (off_cur + bytesperline) & s->cirrus_addr_mask;
off_cur &= TARGET_PAGE_MASK;
while (off_cur < off_cur_end) {
cpu_physical_memory_set_dirty(s->vram_offset + off_cur);
@@ -654,7 +668,11 @@ static int cirrus_bitblt_common_patterncopy(CirrusVGAState * s,
{
uint8_t *dst;
- dst = s->vram_ptr + s->cirrus_blt_dstaddr;
+ dst = s->vram_ptr + (s->cirrus_blt_dstaddr & s->cirrus_addr_mask);
+
+ if (BLTUNSAFE(s))
+ return 0;
+
(*s->cirrus_rop) (s, dst, src,
s->cirrus_blt_dstpitch, 0,
s->cirrus_blt_width, s->cirrus_blt_height);
@@ -670,8 +688,10 @@ static int cirrus_bitblt_solidfill(CirrusVGAState *s, int blt_rop)
{
cirrus_fill_t rop_func;
+ if (BLTUNSAFE(s))
+ return 0;
rop_func = cirrus_fill[rop_to_index[blt_rop]][s->cirrus_blt_pixelwidth - 1];
- rop_func(s, s->vram_ptr + s->cirrus_blt_dstaddr,
+ rop_func(s, s->vram_ptr + (s->cirrus_blt_dstaddr & s->cirrus_addr_mask),
s->cirrus_blt_dstpitch,
s->cirrus_blt_width, s->cirrus_blt_height);
cirrus_invalidate_region(s, s->cirrus_blt_dstaddr,
@@ -690,8 +710,8 @@ static int cirrus_bitblt_solidfill(CirrusVGAState *s, int blt_rop)
static int cirrus_bitblt_videotovideo_patterncopy(CirrusVGAState * s)
{
return cirrus_bitblt_common_patterncopy(s,
- s->vram_ptr +
- (s->cirrus_blt_srcaddr & ~7));
+ s->vram_ptr + ((s->cirrus_blt_srcaddr & ~7) &
+ s->cirrus_addr_mask));
}
static void cirrus_do_copy(CirrusVGAState *s, int dst, int src, int w, int h)
@@ -741,8 +761,10 @@ static void cirrus_do_copy(CirrusVGAState *s, int dst, int src, int w, int h)
if (notify)
vga_hw_update();
- (*s->cirrus_rop) (s, s->vram_ptr + s->cirrus_blt_dstaddr,
- s->vram_ptr + s->cirrus_blt_srcaddr,
+ (*s->cirrus_rop) (s, s->vram_ptr +
+ (s->cirrus_blt_dstaddr & s->cirrus_addr_mask),
+ s->vram_ptr +
+ (s->cirrus_blt_srcaddr & s->cirrus_addr_mask),
s->cirrus_blt_dstpitch, s->cirrus_blt_srcpitch,
s->cirrus_blt_width, s->cirrus_blt_height);
@@ -768,8 +790,14 @@ static int cirrus_bitblt_videotovideo_copy(CirrusVGAState * s)
s->cirrus_blt_srcaddr - s->start_addr,
s->cirrus_blt_width, s->cirrus_blt_height);
} else {
- (*s->cirrus_rop) (s, s->vram_ptr + s->cirrus_blt_dstaddr,
- s->vram_ptr + s->cirrus_blt_srcaddr,
+
+ if (BLTUNSAFE(s))
+ return 0;
+
+ (*s->cirrus_rop) (s, s->vram_ptr +
+ (s->cirrus_blt_dstaddr & s->cirrus_addr_mask),
+ s->vram_ptr +
+ (s->cirrus_blt_srcaddr & s->cirrus_addr_mask),
s->cirrus_blt_dstpitch, s->cirrus_blt_srcpitch,
s->cirrus_blt_width, s->cirrus_blt_height);
@@ -801,8 +829,9 @@ static void cirrus_bitblt_cputovideo_next(CirrusVGAState * s)
} else {
/* at least one scan line */
do {
- (*s->cirrus_rop)(s, s->vram_ptr + s->cirrus_blt_dstaddr,
- s->cirrus_bltbuf, 0, 0, s->cirrus_blt_width, 1);
+ (*s->cirrus_rop)(s, s->vram_ptr +
+ (s->cirrus_blt_dstaddr & s->cirrus_addr_mask),
+ s->cirrus_bltbuf, 0, 0, s->cirrus_blt_width, 1);
cirrus_invalidate_region(s, s->cirrus_blt_dstaddr, 0,
s->cirrus_blt_width, 1);
s->cirrus_blt_dstaddr += s->cirrus_blt_dstpitch;
@@ -1920,7 +1949,7 @@ static void cirrus_mem_writeb_mode4and5_8bpp(CirrusVGAState * s,
unsigned val = mem_value;
uint8_t *dst;
- dst = s->vram_ptr + offset;
+ dst = s->vram_ptr + (offset &= s->cirrus_addr_mask);
for (x = 0; x < 8; x++) {
if (val & 0x80) {
*dst = s->cirrus_shadow_gr1;
@@ -1943,7 +1972,7 @@ static void cirrus_mem_writeb_mode4and5_16bpp(CirrusVGAState * s,
unsigned val = mem_value;
uint8_t *dst;
- dst = s->vram_ptr + offset;
+ dst = s->vram_ptr + (offset &= s->cirrus_addr_mask);
for (x = 0; x < 8; x++) {
if (val & 0x80) {
*dst = s->cirrus_shadow_gr1;
diff --git a/qemu/hw/cirrus_vga_rop.h b/hw/cirrus_vga_rop.h
index 3d6a1fe..0079d12 100644
--- a/qemu/hw/cirrus_vga_rop.h
+++ b/qemu/hw/cirrus_vga_rop.h
@@ -31,6 +31,12 @@ glue(cirrus_bitblt_rop_fwd_, ROP_NAME)(CirrusVGAState *s,
int x,y;
dstpitch -= bltwidth;
srcpitch -= bltwidth;
+
+ if (dstpitch < 0 || srcpitch < 0) {
+ /* is 0 valid? srcpitch == 0 could be useful */
+ return;
+ }
+
for (y = 0; y < bltheight; y++) {
for (x = 0; x < bltwidth; x++) {
ROP_OP(*dst, *src);
Index: kvm.spec
===================================================================
RCS file: /cvs/pkgs/rpms/kvm/F-8/kvm.spec,v
retrieving revision 1.33
retrieving revision 1.34
diff -u -r1.33 -r1.34
--- kvm.spec 23 May 2008 14:49:23 -0000 1.33
+++ kvm.spec 27 May 2008 13:26:17 -0000 1.34
@@ -1,7 +1,7 @@
Summary: Kernel-based Virtual Machine
Name: kvm
Version: 60
-Release: 5%{?dist}
+Release: 6%{?dist}
License: GPLv2+ and LGPLv2+
Group: Development/Tools
URL: http://%{name}.sf.net
@@ -11,6 +11,7 @@
Patch2: %{name}-%{version}-block-rw-range-check.patch
Patch3: %{name}-cirrus.patch
Patch4: %{name}-60-pty-rawmode.patch
+Patch5: %{name}-cirrus-bitblt-overflow.patch
# patches from upstream qemu
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
BuildRequires: SDL-devel
@@ -43,6 +44,7 @@
%patch2 -p1
%patch3 -p1
%patch4 -p1
+%patch5 -p1
%build
# we need to install the data bits in a different path
@@ -97,6 +99,9 @@
%{_sysconfdir}/sysconfig/modules/%{name}.modules
%changelog
+* Tue May 27 2008 Glauber Costa <gcosta at redhat.com> - 60-6.fc8
+- Fix Cirrus heap overflow vulnerability (#448525)
+
* Fri May 23 2008 Daniel P. Berrange <berrange at redhat.com> - 60-5.fc8
- Put PTY in rawmode
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