Re: On exploiting null ptr derefs, disabling SELinux, andsilently fixed Linux vulns

[Thomas Ptacek <tqbf () matasano com>]

It really sounds like you two are saying the same thing. The flaw  
isn't a NULL pointer dereference, it's a u/k address folding that  
happens to involve an offset from NULL.

It really doesn't sound like either of you disagree that "NULL  
pointer reads are exploitable in the common case"; I thought that was  
Zalewski's point.

On Mar 5, 2007, at 8:23 AM, TINNES Julien RD-MAPS-ISS wrote:

> To sum it up, you control what is at any address in user-land (you've
> already got arbitrary code execution and can use mmap/munmap) and,
> because of a flaw (a to-user-land pointer dereference), the kernel  
> will
> 'think' his data is in some area you control (here the first page  
> of the
> process).

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