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

[H.J. Lu]

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?

-- 
H.J.