linux-kernel - Re: [PATCH] x86: ptrace debugreg checks rewrite

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Message-ID: <20090507002455.GD3756@redhat.com>
Date:	Thu, 7 May 2009 02:24:55 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Alexey Dobriyan <adobriyan@...il.com>,
	Roland McGrath <roland@...hat.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, containers@...ts.linux-foundation.org
Subject: Re: [PATCH] x86: ptrace debugreg checks rewrite

On 05/06, Ingo Molnar wrote:
>
> * Alexey Dobriyan <adobriyan@...il.com> wrote:
>
> > On Mon, May 04, 2009 at 04:16:01AM +0400, Alexey Dobriyan wrote:
> > > +static int ptrace_check_debugreg(int _32bit,
> > > +				 unsigned long dr0, unsigned long dr1,
> > > +				 unsigned long dr2, unsigned long dr3,
> > > +				 unsigned long dr6, unsigned long dr7)
> > > +{
> > > +	/* Breakpoint type: 00: --x, 01: -w-, 10: undefined, 11: rw- */
> > > +	unsigned int rw[4];
> > > +	/* Breakpoint length: 00: 1 byte, 01: 2 bytes, 10: 8 bytes, 11: bytes */
> > 								        4 bytes, of course
>
> Roland, Oleg, do you have any pending/planned changes in this area?

No, I don't (and couldn't since I don't understand this code ;)

Oleg.

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