On Fri, 10 Feb 2017, Xen.org security team wrote:

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           Xen Security Advisory CVE-2017-2615 / XSA-208

                  oob access in cirrus bitblt copy

The qemu-xen-traditional patch is malformed, as the file it tries to patch is at the xen-qemu location and the before and after line counts are wrong, so

--- a/hw/display/cirrus_vga.c
+++ b/hw/display/cirrus_vga.c
@@ -307,11 +307,9 @@ static bool blit_region_is_unsafe(struct CirrusVGAState *s,

should be (if I have got the offset right)

--- a/hw/cirrus_vga.c
+++ b/hw/cirrus_vga.c
@@ -308,10 +308,9 @@ static bool blit_region_is_unsafe(struct CirrusVGAState *s,

        Michael Young

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