linux-kernel - Re: PTRACE_SYSCALL && vsyscall (Was: arch_check_bp_in

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Message-ID: <20130112181258.GA24903@redhat.com>
Date:	Sat, 12 Jan 2013 19:12:58 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	u3557@...o.sublimeip.com
Cc:	Pedro Alves <palves@...hat.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Jan Kratochvil <jan.kratochvil@...hat.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: PTRACE_SYSCALL && vsyscall (Was: arch_check_bp_in_kernelspace:
	fix the range check)

On 01/10, u3557@...o.sublimeip.com wrote:
>
> Hi Everyone,
>
> > On 01/08, Pedro Alves wrote:
> >>
> >> On 12/04/2012 05:59 PM, Oleg Nesterov wrote:
> >>
> >> > But If we want to allow to trace vsyscall's, hw bp doesn't look very
> >> > nice imo. HBP_NUM = 4 and you need to setup 3 bp's to trace them all.
> >>
> >> Irrespective of the whole syscall tracing issue, allowing HW bkpts in
> >> the vsyscall just seems like a bug fix to me.
> >
> > And I never argued. I sent the patch iirc ;)
>
> Exactly, it is a bug and I am still waiting for it to be fixed in the
> Linux kernel.

I would not say this is a bug but let me repeat, no need to convince me.

Please feel free to re-send the patch(es) I sent to maintainers. Sorry,
I can't push these changes into Linus's tree.

Oleg.

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