linux-kernel - Re: [PATCH] ptrace: copy_thread() should clear TIF_SINGLESTEP and X86_EFLAGS

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Date:	Fri, 6 Nov 2009 22:50:04 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH] ptrace: copy_thread() should clear TIF_SINGLESTEP and
	X86_EFLAGS_TF

On 11/06, Roland McGrath wrote:
>
> There is also the TIF_FORCED_TF logic to check.

I thought this flag has no effect without TIF_SINGLESTEP, and it is
always updated by enable_single_step().

> Probably it should just
> call user_disable_single_step() instead.  Perhaps copy_process() should
> just call that and then no per-arch changes would be required.

OK, thanks, will resend tomorrow.

user_disable_single_step() is very much arch-dependent, I am worried
if it is safe to call it from copy_process(), when the new task_struct,
thread_info, etc are not properly initialized yet...

Oleg.

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