linux-kernel - Re: Really good idea to allow mmap(0, FIXED)?

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Message-ID: <4525DCC5.40101@goop.org>
Date:	Thu, 05 Oct 2006 21:34:13 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	David Wagner <daw-usenet@...erner.cs.berkeley.edu>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Really good idea to allow mmap(0, FIXED)?

David Wagner wrote:
> Is this right?  Have I correctly understood the issue?

More or less, though a simpler example would be something like:

    if (thing->uid == 0)
        do_magic();

and if "thing" happens to be in userspace (NULL or otherwise) then the 
user can control this test.  So the answer is that the kernel shouldn't 
be looking at uninitialized pointers.

    J
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