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

From: Luca Dariz
Subject: Re: [PATCH 5/5] add setting gs/fsbase
Date: Sat, 22 Apr 2023 13:17:06 +0200

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.


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