linux-kernel - Re: [PATCHv2 5/6] x86/ptrace: down with test_thread_flag(TIF

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Message-ID: <CALCETrXDZDfc2iGsn_UAgVsyGsUh5yj76E+=h3g9sK8LW5kE_A@mail.gmail.com>
Date:	Wed, 6 Jul 2016 07:32:26 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Dmitry Safonov <dsafonov@...tuozzo.com>,
	Pedro Alves <palves@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dmitry Safonov <0x7f454c46@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Ingo Molnar <mingo@...hat.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>, xemul@...tuozzo.com,
	Oleg Nesterov <oleg@...hat.com>,
	Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>
Subject: Re: [PATCHv2 5/6] x86/ptrace: down with test_thread_flag(TIF_IA32)

On Wed, Jun 29, 2016 at 3:57 AM, Dmitry Safonov <dsafonov@...tuozzo.com> wrote:
> As the task isn't executing at the moment of {GET,SET}REGS,
> return regset that corresponds to code selector, rather than
> value of TIF_IA32 flag.
> I.e. if we ptrace i386 elf binary that has just changed it's
> code selector to __USER_CS, than GET_REGS will return
> full x86_64 register set.

Pedro, I think this will cause gdb to be a little less broken than it
is now.  Am I right?  Will this break anything?

--Andy