[gnutls-devel] memcpy problem with RSA-PSK

Nikos Mavrogiannopoulos nmav at gnutls.org
Fri Apr 18 16:34:58 CEST 2014

On Fri, Apr 18, 2014 at 1:57 PM, A. Klitzing <aklitzing at gmail.com> wrote:
> Hi!
> I looked into it a little bit.
> In lib/auth/psk.c in line 343 it will call "info =
> _gnutls_get_auth_info(session);". It is expected that info is a
> psk_auth_info_t with a size of 1096 but it will return a cert_auth_info_t
> with a size of 80. So memcpy will write into bad memory!

Indeed valgrind was quite indicative. It seems that RSA-PSK has issues
when the server sends the identity hint. The self check didn't do that
and that's how it wasn't detected so far. I've committed a fix in the


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