84 lines
3.9 KiB
Diff
84 lines
3.9 KiB
Diff
From d1d13b1f86a5ac0520dc7369873d6478b583af04 Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= <philmd@redhat.com>
|
|
Date: Mon, 6 Sep 2021 17:31:03 +0200
|
|
Subject: [PATCH 6/6] hw/display/ati_2d: Fix buffer overflow in ati_2d_blt
|
|
(CVE-2021-3638)
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
When building QEMU with DEBUG_ATI defined then running with
|
|
'-device ati-vga,romfile="" -d unimp,guest_errors -trace ati\*'
|
|
we get:
|
|
|
|
ati_mm_write 4 0x16c0 DP_CNTL <- 0x1
|
|
ati_mm_write 4 0x146c DP_GUI_MASTER_CNTL <- 0x2
|
|
ati_mm_write 4 0x16c8 DP_MIX <- 0xff0000
|
|
ati_mm_write 4 0x16c4 DP_DATATYPE <- 0x2
|
|
ati_mm_write 4 0x224 CRTC_OFFSET <- 0x0
|
|
ati_mm_write 4 0x142c DST_PITCH_OFFSET <- 0xfe00000
|
|
ati_mm_write 4 0x1420 DST_Y <- 0x3fff
|
|
ati_mm_write 4 0x1410 DST_HEIGHT <- 0x3fff
|
|
ati_mm_write 4 0x1588 DST_WIDTH_X <- 0x3fff3fff
|
|
ati_2d_blt: vram:0x7fff5fa00000 addr:0 ds:0x7fff61273800 stride:2560 bpp:32 rop:0xff
|
|
ati_2d_blt: 0 0 0, 0 127 0, (0,0) -> (16383,16383) 16383x16383 > ^
|
|
ati_2d_blt: pixman_fill(dst:0x7fff5fa00000, stride:254, bpp:8, x:16383, y:16383, w:16383, h:16383, xor:0xff000000)
|
|
Thread 3 "qemu-system-i38" received signal SIGSEGV, Segmentation fault.
|
|
(gdb) bt
|
|
#0 0x00007ffff7f62ce0 in sse2_fill.lto_priv () at /lib64/libpixman-1.so.0
|
|
#1 0x00007ffff7f09278 in pixman_fill () at /lib64/libpixman-1.so.0
|
|
#2 0x0000555557b5a9af in ati_2d_blt (s=0x631000028800) at hw/display/ati_2d.c:196
|
|
#3 0x0000555557b4b5a2 in ati_mm_write (opaque=0x631000028800, addr=5512, data=1073692671, size=4) at hw/display/ati.c:843
|
|
#4 0x0000555558b90ec4 in memory_region_write_accessor (mr=0x631000039cc0, addr=5512, ..., size=4, ...) at softmmu/memory.c:492
|
|
|
|
Commit 584acf34cb0 ("ati-vga: Fix reverse bit blts") introduced
|
|
the local dst_x and dst_y which adjust the (x, y) coordinates
|
|
depending on the direction in the SRCCOPY ROP3 operation, but
|
|
forgot to address the same issue for the PATCOPY, BLACKNESS and
|
|
WHITENESS operations, which also call pixman_fill().
|
|
|
|
Fix that now by using the adjusted coordinates in the pixman_fill
|
|
call, and update the related debug printf().
|
|
|
|
Reported-by: Qiang Liu <qiangliu@zju.edu.cn>
|
|
Fixes: 584acf34cb0 ("ati-vga: Fix reverse bit blts")
|
|
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
|
|
Tested-by: Mauro Matteo Cascella <mcascell@redhat.com>
|
|
Message-Id: <20210906153103.1661195-1-philmd@redhat.com>
|
|
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
|
|
Signed-off-by: wanbo <wanbo13@huawei.com>
|
|
---
|
|
hw/display/ati_2d.c | 6 +++---
|
|
1 file changed, 3 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/hw/display/ati_2d.c b/hw/display/ati_2d.c
|
|
index 4dc10ea795..692bec91de 100644
|
|
--- a/hw/display/ati_2d.c
|
|
+++ b/hw/display/ati_2d.c
|
|
@@ -84,7 +84,7 @@ void ati_2d_blt(ATIVGAState *s)
|
|
DPRINTF("%d %d %d, %d %d %d, (%d,%d) -> (%d,%d) %dx%d %c %c\n",
|
|
s->regs.src_offset, s->regs.dst_offset, s->regs.default_offset,
|
|
s->regs.src_pitch, s->regs.dst_pitch, s->regs.default_pitch,
|
|
- s->regs.src_x, s->regs.src_y, s->regs.dst_x, s->regs.dst_y,
|
|
+ s->regs.src_x, s->regs.src_y, dst_x, dst_y,
|
|
s->regs.dst_width, s->regs.dst_height,
|
|
(s->regs.dp_cntl & DST_X_LEFT_TO_RIGHT ? '>' : '<'),
|
|
(s->regs.dp_cntl & DST_Y_TOP_TO_BOTTOM ? 'v' : '^'));
|
|
@@ -180,11 +180,11 @@ void ati_2d_blt(ATIVGAState *s)
|
|
dst_stride /= sizeof(uint32_t);
|
|
DPRINTF("pixman_fill(%p, %d, %d, %d, %d, %d, %d, %x)\n",
|
|
dst_bits, dst_stride, bpp,
|
|
- s->regs.dst_x, s->regs.dst_y,
|
|
+ dst_x, dst_y,
|
|
s->regs.dst_width, s->regs.dst_height,
|
|
filler);
|
|
pixman_fill((uint32_t *)dst_bits, dst_stride, bpp,
|
|
- s->regs.dst_x, s->regs.dst_y,
|
|
+ dst_x, dst_y,
|
|
s->regs.dst_width, s->regs.dst_height,
|
|
filler);
|
|
if (dst_bits >= s->vga.vram_ptr + s->vga.vbe_start_addr &&
|
|
--
|
|
2.27.0
|
|
|