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

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Message-ID: <alpine.LFD.0.999.0710311602170.3342@woody.linux-foundation.org>
Date:	Wed, 31 Oct 2007 16:08:21 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Nick Piggin <npiggin@...e.de>
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, 31 Oct 2007, Nick Piggin wrote:
> 
> No that would be great. Fingers crossed it won't cause any problems.

I actually doubt it will cause problems.

We made much bigger changes to ptrace support when we disallowed writing 
to read-only shared memory areas (we used to do the magic per-page COW 
thing).

But if people have test-cases for ptrace and/or other magical users of 
access_vm_pages() (things like core-dumping comes to mind - although I 
think we don't dump pure file mappings at all, do we?) it would certainly 
be good to run any such tests on the current -git tree...

		Linus
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