1 files changed, 0 insertions, 60 deletions
diff --git a/main/xen/xsa209-0002-cirrus-add-blit_is_unsafe-call-to-cirrus_bitblt_cput.patch b/main/xen/xsa209-0002-cirrus-add-blit_is_unsafe-call-to-cirrus_bitblt_cput.patch
deleted file mode 100644
index afaf916237..0000000000
--- a/main/xen/xsa209-0002-cirrus-add-blit_is_unsafe-call-to-cirrus_bitblt_cput.patch
+++ /dev/null
@@ -1,60 +0,0 @@
-From 15268f91fbe75b38a851c458aef74e693d646ea5 Mon Sep 17 00:00:00 2001
-From: Gerd Hoffmann <kraxel@redhat.com>
-Date: Tue, 21 Feb 2017 10:54:59 -0800
-Subject: [PATCH 2/2] cirrus: add blit_is_unsafe call to
- cirrus_bitblt_cputovideo
-
-CIRRUS_BLTMODE_MEMSYSSRC blits do NOT check blit destination
-and blit width, at all.  Oops.  Fix it.
-
-Security impact: high.
-
-The missing blit destination check allows to write to host memory.
-Basically same as CVE-2014-8106 for the other blit variants.
-
-The missing blit width check allows to overflow cirrus_bltbuf,
-with the attractive target cirrus_srcptr (current cirrus_bltbuf write
-position) being located right after cirrus_bltbuf in CirrusVGAState.
-
-Due to cirrus emulation writing cirrus_bltbuf bytewise the attacker
-hasn't full control over cirrus_srcptr though, only one byte can be
-changed.  Once the first byte has been modified further writes land
-elsewhere.
-
-[ This is CVE-2017-2620 / XSA-209  - Ian Jackson ]
-
-Reported-by: Gerd Hoffmann <ghoffman@redhat.com>
-Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
----
- hw/display/cirrus_vga.c | 8 ++++++++
- 1 file changed, 8 insertions(+)
-
-diff --git a/hw/display/cirrus_vga.c b/hw/display/cirrus_vga.c
-index 34a6900..5901250 100644
---- a/hw/display/cirrus_vga.c
-+++ b/tools/qemu-xen/hw/display/cirrus_vga.c
-@@ -865,6 +865,10 @@ static int cirrus_bitblt_cputovideo(CirrusVGAState * s)
- {
-     int w;
- 
-+    if (blit_is_unsafe(s, true)) {
-+        return 0;
-+    }
-+
-     s->cirrus_blt_mode &= ~CIRRUS_BLTMODE_MEMSYSSRC;
-     s->cirrus_srcptr = &s->cirrus_bltbuf[0];
-     s->cirrus_srcptr_end = &s->cirrus_bltbuf[0];
-@@ -890,6 +894,10 @@ static int cirrus_bitblt_cputovideo(CirrusVGAState * s)
- 	}
-         s->cirrus_srccounter = s->cirrus_blt_srcpitch * s->cirrus_blt_height;
-     }
-+
-+    /* the blit_is_unsafe call above should catch this */
-+    assert(s->cirrus_blt_srcpitch <= CIRRUS_BLTBUFSIZE);
-+
-     s->cirrus_srcptr = s->cirrus_bltbuf;
-     s->cirrus_srcptr_end = s->cirrus_bltbuf + s->cirrus_blt_srcpitch;
-     cirrus_update_memory_access(s);
--- 
-2.1.4
-