Re: [PATCH 5/5] add setting gs/fsbase

[Luca Dariz]

Hi Sergey,

Il 20/04/23 13:51, Sergey Bugaev ha scritto:
> On Wed, Apr 19, 2023 at 11:52 PM Sergey Bugaev <bugaevc@gmail.com> wrote:
> We do reach the call to __thread_set_state (), but then it uses
> __mig_memcpy (), which is just 'return memcpy (...)'. And (because of
> the static build?), that memcpy () is the full real ifunc-selected
> memcpy. So it jumps to the memcpy@plt, which jumps to
> *(memcpy@got.plt), which is supposed to jump into the rtld and then
> run the ifunc resolver and do its smarts and eventually jump to the
> right memcpy...

I don't know if you already found a good solution for this, but if not 
maybe we could add an x86_64-specific plain syscall to set fsbase/gsbase 
during bootstrap, if it can make things more manageable.


Luca