Re: RFC: x86: Fall back to lazy binding for unrelocated IFUNC symbol [BZ #23240]

[Florian Weimer <fweimer at redhat dot com>]

On 06/06/2018 04:50 PM, H.J. Lu wrote:
> On Wed, Jun 6, 2018 at 7:04 AM, Florian Weimer <fweimer@redhat.com> wrote:
> > On 06/05/2018 09:24 PM, Florian Weimer wrote:
> > > On 05/28/2018 09:51 PM, H.J. Lu wrote:
> > > > Here is the updated patch.  It fails to back lazy binding only
> > > > if GOT is writable.
> > >
> > >
> > > I think this still sets a wrong incentive, as in “you need to have a
> > > writable GOT for full forwards compatibility with future library evolution”.
> > >
> > > I think if we detect an IFUNC-based relocation against a
> > > not-yet-fully-relocated object, we need to delay this relocation processing
> > > and perform a second pass of all delayed relocations.  I have a patch which
> > > needs a little bit of work, but looks quite promising (to me at least).
> >
> >
> > Here are my patches:
> >
> > https://sourceware.org/ml/libc-alpha/2018-06/msg00076.html
> > https://sourceware.org/ml/libc-alpha/2018-06/msg00077.html
> >
> > I hope they address your needs.
>
> Do you have a git branch I can use?

I've pushed it to fw/bug21242.

Florian