From: "Manfred Spraul" <manfred@colorfullife.com>
To: "Daniel Jacobowitz" <dan@debian.org>
Cc: <linux-kernel@vger.kernel.org>, "Andrew Morton" <akpm@zip.com.au>
Subject: Re: [PATCH?] Crash in 2.4.17/ptrace
Date: Mon, 28 Jan 2002 22:33:35 +0100 [thread overview]
Message-ID: <001401c1a844$ae7c51b0$010411ac@local> (raw)
> >
> > Not with this patch, I'm afraid. For your testing purposes you
> > could just remove the VALID_PAGE() test in
mm/memory.c:get_page_map(),
> > and then gdb should be able to get at the framebuffer.
>
> I'm sure there's a good reason to not do that in general. Mind
> enlightening me?
Please don't do it at all.
The test is there to ensure that there is a 'struct page' for address
found in the pages tables.
For framebuffers addresses, there is no page structure, and then the
page reference count updates read/write to random memory.
--
Manfred
next reply other threads:[~2002-01-28 21:42 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-28 21:33 Manfred Spraul [this message]
2002-01-28 22:05 ` [PATCH?] Crash in 2.4.17/ptrace Alan Cox
2002-01-28 22:07 ` Manfred Spraul
2002-01-28 22:26 ` Daniel Jacobowitz
-- strict thread matches above, loose matches on Subject: below --
2002-01-28 20:32 Daniel Jacobowitz
2002-01-28 21:03 ` Andrew Morton
2002-01-28 21:19 ` Daniel Jacobowitz
2002-01-28 21:29 ` Andrew Morton
2002-01-28 21:55 ` Alan Cox
2002-01-28 22:12 ` Andrew Morton
2002-01-28 22:15 ` Benjamin Herrenschmidt
2002-01-28 23:57 ` Andrea Arcangeli
2002-01-28 23:54 ` Andrea Arcangeli
2002-01-29 5:35 ` Andrew Morton
2002-01-28 23:47 ` Andrea Arcangeli
2002-01-28 21:42 ` Andrew Morton
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