linux-kernel - Re: 2.6.23 regression: accessing invalid mmap'ed memory from gdb causes unkillable spinning

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Message-ID: <20071031225541.GA28552@wotan.suse.de>
Date:	Wed, 31 Oct 2007 23:55:41 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Duane Griffin <duaneg@...da.com>,
	linux-kernel Mailing List <linux-kernel@...r.kernel.org>,
	stable@...nel.org
Subject: Re: 2.6.23 regression: accessing invalid mmap'ed memory from gdb causes unkillable spinning

On Wed, Oct 31, 2007 at 08:59:41AM -0700, Linus Torvalds wrote:
> 
> 
> On Wed, 31 Oct 2007, Nick Piggin wrote:
> > 
> > Well the patch is right, in the context of the regression I introduced
> > (and so it should probably go into 2.6.23).
> 
> Yeah, it probably is fine for -stable.
> 
> And if mine (which actually changes behaviour, in that it makes ptrace get 
> an access error) causes regressions, I guess we'll have to use that 
> compatible-with-old-behaviour one for 2.6.24 too.
> 
> But I just rebooted and tested - the cleaned-up patch does seem to work 
> fine, and I get "Cannot access memory at address <xyz>" rather than any 
> reported problem.
> 
> So I think I'll commit my version asap, and see if anybody reports that 
> they have a situation where they use ptrace() and expect zero back from a 
> shared mapping past the end.. And if there are issues, we can switch back 
> to the old broken behaviour with your patch,

No that would be great. Fingers crossed it won't cause any problems.

Thanks, all.
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