linux-kernel - Re: [PATCH 6/7] uprobes: Xol should send SIGTRAP if X86_EFLAGS

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Date:	Wed, 12 Sep 2012 16:45:32 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Anton Arapov <anton@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Roland McGrath <roland@...k.frob.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] uprobes: Xol should send SIGTRAP if X86_EFLAGS_TF
	was set

On 09/12, Srikar Dronamraju wrote:
>
> * Oleg Nesterov <oleg@...hat.com> [2012-09-03 17:26:16]:
>
> > Note: send_sig(SIGTRAP) is not actually right, we need send_sigtrap().
>
> Are you pointing to the info field not being filled? or are there other
> problems?

Yes.

Also, I am not sure but I feel we should move this into generic code
somehow. We will see.

> > But this needs more changes, handle_swbp() does the same and this is
> > equally wrong.
>
> send_sigtrap() is arch specific and defined for only few archs.
> we would have to force.

Yes, but we have user_single_step_siginfo(), probably this is enough.

> But these are not related to the patch.

Agreed, lets do this later.

> Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

Thanks!

Oleg.

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