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Message-ID: <20071102063011.GB20967@wotan.suse.de> Date: Fri, 2 Nov 2007 07:30:11 +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, Hugh Dickins <hugh@...itas.com> Subject: Re: 2.6.23 regression: accessing invalid mmap'ed memory from gdb causes unkillable spinning On Thu, Nov 01, 2007 at 06:17:42PM -0700, Linus Torvalds wrote: > > > 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). Oh yeah, I think it would probably be clearer to use VM_SHARED == MAP_SHARED, and test the write permission explicitly. Though there could be something I missed that makes it not as easy as it sounds... probably something best left for Hugh ;) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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