full-disclosure - Re: Linux Kernel sctp_setsockopt() Integer Overflow

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Message-ID: <20040515220850.GA11730@e-matters.de>
From: s.esser at e-matters.de (Stefan Esser)
Subject: Re: Linux Kernel sctp_setsockopt() Integer Overflow

> How did you come from the above snippet of the code to the idea that
> kmalloc(0) returns NULL?

Doesn't matter: the first thing linux's sys_setsockopt() does is
checking if optlen is < 0. It will fail in this case. So the
needed optlen is never handled down to the protocol setsockopt function.
Otherwise you would find several protocol handlers vulnerable...
f.e. IPv6...

Stefan Esser

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 Stefan Esser                                        s.esser@...atters.de
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