Re: [PATCH] x86/ptrace: Remove questionable TS_COMPAT usage in ptrace

[Oleg Nesterov]

On 06/19, Andy Lutomirski wrote:
>
> On Sun, Jun 19, 2016 at 2:19 PM, Oleg Nesterov <oleg@xxxxxxxxxx> wrote:
> >
> > And this leads to another question, why do we actually need to set/clear
> > TS_COMPAT in set_personality_ia32() ??
>
> Something's clearly buggy there, considering that
> set_personality_64bit() does *not* clear it.

Yes, yes, I too noticed this, and this doesn't match the "if (x32)"
branch in set_personality_ia32().

But I think we do not really need to clear this bit. And probably
set_personality_ia32() doesn't need to play with TS_COMPAT.

Oleg.