[Xen-changelog] [xen-unstable] VT-d: fix interrupt remapping source validation for devices behind legacy bridges

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1357748006 -3600
# Node ID 19fd1237ff0dfa3d97a896d6ed6fbbd33f816a9f
# Parent  56b0d5476c11bfd09986080dfa97923586ef474f
VT-d: fix interrupt remapping source validation for devices behind legacy 
bridges

Using SVT_VERIFY_BUS here doesn't make sense; native Linux also
uses SVT_VERIFY_SID_SQ here instead.

This is XSA-33 / CVE-2012-5634.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---


diff -r 56b0d5476c11 -r 19fd1237ff0d xen/drivers/passthrough/vtd/intremap.c
--- a/xen/drivers/passthrough/vtd/intremap.c    Wed Jan 09 15:00:58 2013 +0000
+++ b/xen/drivers/passthrough/vtd/intremap.c    Wed Jan 09 17:13:26 2013 +0100
@@ -473,7 +473,7 @@ static void set_msi_source_id(struct pci
                 set_ire_sid(ire, SVT_VERIFY_BUS, SQ_ALL_16,
                             (bus << 8) | pdev->bus);
             else if ( pdev_type(seg, bus, devfn) == DEV_TYPE_LEGACY_PCI_BRIDGE 
)
-                set_ire_sid(ire, SVT_VERIFY_BUS, SQ_ALL_16,
+                set_ire_sid(ire, SVT_VERIFY_SID_SQ, SQ_ALL_16,
                             PCI_BDF2(bus, devfn));
         }
         break;

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