Re: [PATCH?] Crash in 2.4.17/ptrace

Manfred Spraul (manfred@colorfullife.com)
Mon, 28 Jan 2002 22:33:35 +0100

> >
> > 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


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