linux-kernel - Re: [PATCH 2/4] MIPS Kprobes: Deny probes on ll/sc instructions

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Date:	Wed, 16 Nov 2011 12:12:07 +0000
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Victor Kamensky <kamensky@...co.com>
Cc:	David Daney <david.daney@...ium.com>,
	"manesoni@...co.com" <manesoni@...co.com>,
	"ananth@...ibm.com" <ananth@...ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>
Subject: Re: [PATCH 2/4] MIPS Kprobes: Deny probes on ll/sc instructions

On Tue, Nov 08, 2011 at 03:26:42PM -0800, Victor Kamensky wrote:

> > s/insturctions/instructions/
> >
> > Not only is it a bad idea, it will probably make them fail 100% of the time.
> >
> > It is also an equally bad idea to place a probe between any LL and SC
> > instructions.  How do you prevent that?
> 
> As per below code comment we don't prevent that. There is no way to do
> that.

Similar to the way that the addresses of loads and stores from userspace
are recorded in a special section we could build a list of forbidden
address range.

Is it worth it?

  Ralf
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