3d039dc5d8
CVE-2016-9603: cirrus: heap buffer overflow via vnc connection (bz #1432040) CVE-2017-7377: 9pfs: fix file descriptor leak (bz #1437872) CVE-2017-7980: cirrus: OOB r/w access issues in bitblt (bz #1444372) CVE-2017-8112: vmw_pvscsi: infinite loop in pvscsi_log2 (bz #1445622) CVE-2017-8309: audio: host memory lekage via capture buffer (bz #1446520) CVE-2017-8379: input: host memory lekage via keyboard events (bz #1446560) CVE-2017-8380: scsi: megasas: out-of-bounds read in megasas_mmio_write (bz #1446578) CVE-2017-9060: virtio-gpu: host memory leakage in Virtio GPU device (bz #1452598) CVE-2017-9310: net: infinite loop in e1000e NIC emulation (bz #1452623) CVE-2017-9330: usb: ohci: infinite loop due to incorrect return value (bz #1457699) CVE-2017-9374: usb: ehci host memory leakage during hotunplug (bz #1459137) CVE-2017-10806: usb-redirect: stack buffer overflow in debug logging (bz #1468497)
47 lines
1.5 KiB
Diff
47 lines
1.5 KiB
Diff
From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Wed, 8 Feb 2017 11:18:36 +0100
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Subject: [PATCH] cirrus: add blit_is_unsafe call to cirrus_bitblt_cputovideo
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(CVE-2017-2620)
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CIRRUS_BLTMODE_MEMSYSSRC blits do NOT check blit destination
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and blit width, at all. Oops. Fix it.
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Security impact: high.
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The missing blit destination check allows to write to host memory.
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Basically same as CVE-2014-8106 for the other blit variants.
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit 92f2b88cea48c6aeba8de568a45f2ed958f3c298)
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---
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hw/display/cirrus_vga.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/hw/display/cirrus_vga.c b/hw/display/cirrus_vga.c
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index 0e47cf85ad..a093dc8b16 100644
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--- a/hw/display/cirrus_vga.c
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+++ b/hw/display/cirrus_vga.c
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@@ -899,6 +899,10 @@ static int cirrus_bitblt_cputovideo(CirrusVGAState * s)
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{
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int w;
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+ if (blit_is_unsafe(s, true)) {
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+ return 0;
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+ }
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+
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s->cirrus_blt_mode &= ~CIRRUS_BLTMODE_MEMSYSSRC;
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s->cirrus_srcptr = &s->cirrus_bltbuf[0];
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s->cirrus_srcptr_end = &s->cirrus_bltbuf[0];
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@@ -924,6 +928,10 @@ static int cirrus_bitblt_cputovideo(CirrusVGAState * s)
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}
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s->cirrus_srccounter = s->cirrus_blt_srcpitch * s->cirrus_blt_height;
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}
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+
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+ /* the blit_is_unsafe call above should catch this */
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+ assert(s->cirrus_blt_srcpitch <= CIRRUS_BLTBUFSIZE);
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+
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s->cirrus_srcptr = s->cirrus_bltbuf;
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s->cirrus_srcptr_end = s->cirrus_bltbuf + s->cirrus_blt_srcpitch;
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cirrus_update_memory_access(s);
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