Re: Xen 3.4.x Backports

[Ian Campbell <Ian.Campbell@citrix.com>]

On Tue, 2012-02-28 at 23:36 +0000, Jonathan Tripathy wrote:
> Hi Keith,

On a related note it would be very useful if
http://wiki.xen.org/wiki/Security_Announcements could be updated when
security fixes corresponding to Xen.org security vulnerability
disclosures are added to the 3.4 branch. Keith, can you do that? If not
then if you drop me a line each time I'll take care of it for you.

> CVE-2011-2901:
> http://www.openwall.com/lists/oss-security/2011/09/02/2
> 
> The patch performs the following:
> -    (((unsigned long)(addr) < (1UL<<48)) || \
> +    (((unsigned long)(addr) < (1UL<<47)) || \
> 
> I see that the Xen security advisory says that only hypervisors 3.3 or
> earlier are affected. However, I note that in later versions of Xen,
> the line changed in the patch remains untouched. Any ideas why this is
> the case?

The problem has been fixed in xen-unstable. However only 3.3 and earlier
were actually vulnerable due to the issue and so it has not been
backported the stable branches.

[...]

I've left the others for Keith to comment on as 3.4 maintainer.

Ian