On Mon, Sep 17, 2012 at 9:16 AM, Steffen Klassert <steffen.klass...@secunet.com> wrote: > On Thu, Sep 13, 2012 at 11:41:26PM +0200, Mathias Krause wrote: >> When dump_one_state() returns an error, e.g. because of a too small >> buffer to dump the whole xfrm state, xfrm_state_netlink() returns NULL >> instead of an error pointer. But its callers expect an error pointer >> and therefore continue to operate on a NULL skbuff. >> >> This could lead to a privilege escalation (execution of user code in >> kernel context) if the attacker has CAP_NET_ADMIN and is able to map >> address 0. > > Or it simply crashes with a NULL pointer dereference.
..while holding the xfrm_cfg_mutex, therefore effectively disabling the XFRM netlink interface. So it's at least a DOS in that case ;) Regards, Mathias -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
