Red Hat Bugzilla – Bug 1346981
Regression from CVE-2016-3712: windows installer fails to start [rhel-6.9]
Last modified: 2017-03-21 05:38:56 EDT
+++ This bug was initially created as a clone of Bug #1346976 +++ The fix for CVE-2016-3712 introduced a regression and we'll have to push a new update. From the upstream patch: """ From: Gerd Hoffmann <kraxel@redhat.com> Subject: [Qemu-devel] [PATCH] vga: add sr_vbe register set Commit "fd3c136 vga: make sure vga register setup for vbe stays intact (CVE-2016-3712)." causes a regression. The win7 installer is unhappy because it can't freely modify vga registers any more while in vbe mode. This patch introduces a new sr_vbe register set. The vbe_update_vgaregs will fill sr_vbe[] instead of sr[]. Normal vga register reads and writes go to sr[]. Any sr register read access happens through a new sr() helper function which will read from sr_vbe[] with vbe active and from sr[] otherwise. This way we can allow guests update sr[] registers as they want, without allowing them disrupt vbe video modes that way. Reported-by: Thomas Lamprecht <thomas@lamprecht.org> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> """
Fix included in qemu-kvm-0.12.1.2-2.492.el6
eproduced on 6.9.z host with kernel: 2.6.32-671.el6.x86_64 qemu: qemu-kvm-rhev-0.12.1.2-2.491.el6_8.1.x86_64 Trying to install win7/win2008r2 guests, results: iso:en_windows_7_ultimate_with_sp1_x86_dvd_u_677460.iso result: stuck at "starting windows" iso:en_windows_7_ultimate_with_sp1_x64_dvd_u_677332.iso result: stuck at "starting windows" iso:en_windows_server_2008_r2_standard_enterprise_datacenter_and_web_with_sp1_x64_dvd_617601.iso result: stuck at "starting windows" Install win10 guests for comparing, win10 guests install and work well, isos used: en_windows_10_enterprise_version_1607_updated_jul_2016_x64_dvd_9054264.iso en_windows_10_enterprise_version_1607_updated_jul_2016_x86_dvd_9060097.iso Verify against qemu-kvm-0.12.1.2-2.496.el6.x86_64 Both windows7/win2008r2 guests install and work well. Install win10 guests for comparing, win10 guests install and work well also.
Per comment 5, move to verified
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHSA-2017-0621.html