Re: [Xen-devel] [PATCH LIVEPATCH-BUILD-TOOLS] Fix patch creation with GCC 6.1+

[M A Young <m.a.young@xxxxxxxxxxxx>]

On Thu, 24 Nov 2016, Ross Lagerwall wrote:

> GCC 6.1+ fixed https://gcc.gnu.org/bugzilla/show_bug.cgi?id=192 which
> means that .rodata.str* sections are now split by function.  We could
> probably be smarter about including just the sections we need, but for
> now, include all .rodata.str* sections as is done for previous versions
> of GCC.
> 
> This manifests itself as symbol error. E.g.:
> (XEN)  Unknown symbol: .LC0

There may be a problem with this patch. I built livepatch-build-tools 
(from the xenbits git repo) with this and the other patch posted yesterday 
and successfully built and applied xsa191 to xsa193 (cumulatively) to 
xen-4.8.0-rc6, but the computer freezes if I try to apply xsa194 
(cumulatively or on its own). This was the only patch I tried which got 
the Unknown symbol: .LC3 message ie.
(XEN) livepatch_elf.c:295: livepatch: xsa194: Unknown symbol: .LC3
so this may be related to the crash.

        Michael Young

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