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.0.999.0711011816260.3342@woody.linux-foundation.org>
Date:	Thu, 1 Nov 2007 18:17:42 -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, Hugh Dickins <hugh@...itas.com>
Subject: Re: 2.6.23 regression: accessing invalid mmap'ed memory from gdb
 causes unkillable spinning



On Fri, 2 Nov 2007, Nick Piggin wrote:
> 
> But we do want to allow forced COW faults for MAP_PRIVATE mappings. gdb
> uses this for inserting breakpoints (but fortunately, a COW page in a
> MAP_PRIVATE mapping is a much more natural thing for the VM).

Yes, I phrased that badly. I meant that I'd be happier if we got rid of 
VM_MAYSHARE entirely, and just used VM_SHARED. I thought we already made 
them always be the same (and any VM_MAYSHARE use is historical).

		Linus
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