Xen 4.1 maintenance? (Was Re: [xen-4.1.6.1] SIGSEGV libxc/xc_save_domain.c: p2m_size >> configured_ram_size)

[George Dunlap <george.dunlap@citrix.com>]

On 13/06/16 12:14, Philipp Hahn wrote:
> Am 13.06.2016 um 12:15 schrieb George Dunlap:
>> On Fri, Jun 10, 2016 at 4:22 PM, Philipp Hahn <hahn@univention.de> wrote:
>>> while trying to live migrate some VMs from an xen-4.1.6.1 host "xc_save"
>>> crashes with a segmentation fault in tools/libxc/xc_domain_save.c:1141
>>>>         /*
>>>>          * Quick belt and braces sanity check.
>>>>          */
>>>>         for ( i = 0; i < dinfo->p2m_size; i++ )
>>>>         {
>>>>             mfn = pfn_to_mfn(i);
>>>>             if( (mfn != INVALID_P2M_ENTRY) && (mfn_to_pfn(mfn) != i) )
>>>                                                  ^^^^^^^^^^^^^^^
>>> due to a de-reference through
>>>> #define pfn_to_mfn(_pfn)                                            \
>>>>   ((xen_pfn_t) ((dinfo->guest_width==8)                               \
>>>>                 ? (((uint64_t *)ctx->live_p2m)[(_pfn)])                  \
>>>>                 : ((((uint32_t *)ctx->live_p2m)[(_pfn)]) == 0xffffffffU  \
>>>>                    ? (-1UL) : (((uint32_t *)ctx->live_p2m)[(_pfn)]))))
> ...
>> Given that 4.1 is long out of support, we won't be making a proper fix
>> in-tree (since it will never be released).
> 
> I know that 4.1 is EOL.
> I'm aware of Ubuntu still having xen-4.1 in one of their LTS versions
> (Precise) and its also in Debian-oldstable, which a lot people (us
> included) still use. I would prefer to update, but I can for reasons
> outside my direct control.
> 
> I'm already working with Stefan Bader from Canonical to backport most of
> the XSAs to 4.1, so there already exists a "better" version outside of
> the official Xen repositories.

Philipp / Stefan -- if there really is a large following of people still
using 4.1, would it make sense to have one or both of you step up and
maintain an official branch on xenbits?

 -George

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