guix/gnu/packages/patches/qemu-CVE-2015-4106-pt5.patch

From 45ebe3916ab16f859ed930e92fbd52d84d5dcdaf Mon Sep 17 00:00:00 2001
From: Jan Beulich <jbeulich@suse.com>
Date: Tue, 2 Jun 2015 15:07:01 +0000
Subject: [PATCH] xen/pt: mark all PCIe capability bits read-only

xen_pt_emu_reg_pcie[]'s PCI_EXP_DEVCAP needs to cover all bits as read-
only to avoid unintended write-back (just a precaution, the field ought
to be read-only in hardware).

This is a preparatory patch for XSA-131.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 hw/xen/xen_pt_config_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/xen/xen_pt_config_init.c b/hw/xen/xen_pt_config_init.c
index 3833b9e..9f6c00e 100644
--- a/hw/xen/xen_pt_config_init.c
+++ b/hw/xen/xen_pt_config_init.c
@@ -871,7 +871,7 @@ static XenPTRegInfo xen_pt_emu_reg_pcie[] = {
         .offset     = PCI_EXP_DEVCAP,
         .size       = 4,
         .init_val   = 0x00000000,
-        .ro_mask    = 0x1FFCFFFF,
+        .ro_mask    = 0xFFFFFFFF,
         .emu_mask   = 0x10000000,
         .init       = xen_pt_common_reg_init,
         .u.dw.read  = xen_pt_long_reg_read,
-- 
2.2.1