Re: [CHECKER] two probable security holes

Ken Ashcraft (
Mon, 24 Sep 2001 17:41:44 -0700 (PDT)

On Mon, 24 Sep 2001, David S. Miller wrote:
> ifreq copied safely to kernel space, ifr.ifr_name[] is inside the
> struct and NOT a user pointer.

Sorry, my explanation of the checker may not have been clear enough-- a
format string error does not occur because the kernel dereferences a user
pointer. It happens because the format string to a printing function is
set by the user. You are correct that ifr_name[] is not a user pointer,
but the contents of that array could contain dangerous placeholders set by
the user. I hope that clears things up.


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