On 06/25/17 02:42 AM, Levin, Alexander (Sasha Levin) wrote:
> On Wed, Jun 14, 2017 at 11:37:14AM -0700, Dave Watson wrote:
> >Add the infrustructure for attaching Upper Layer Protocols (ULPs) over TCP
> >sockets. Based on a similar infrastructure in tcp_cong. The idea is that any
> >ULP can add its own logic by changing the TCP proto_ops structure to its own
> >methods.
> >
> >Example usage:
> >
> >setsockopt(sock, SOL_TCP, TCP_ULP, "tls", sizeof("tls"));
> >
> >modules will call:
> >tcp_register_ulp(&tcp_tls_ulp_ops);
> >
> >to register/unregister their ulp, with an init function and name.
> >
> >A list of registered ulps will be returned by tcp_get_available_ulp, which is
> >hooked up to /proc. Example:
> >
> >$ cat /proc/sys/net/ipv4/tcp_available_ulp
> >tls
> >
> >There is currently no functionality to remove or chain ULPs, but
> >it should be possible to add these in the future if needed.
> >
> >Signed-off-by: Boris Pismenny <borisp@xxxxxxxxxxxx>
> >Signed-off-by: Dave Watson <davejwatson@xxxxxx>
>
> Hey Dave,
>
> I'm seeing the following while fuzzing, which was bisected to this commit:
>
> ==================================================================
> BUG: KASAN: null-ptr-deref in copy_to_user include/linux/uaccess.h:168 [inline]
> BUG: KASAN: null-ptr-deref in do_tcp_getsockopt.isra.33+0x24f/0x1e30 net/ipv4/tcp.c:3057
> Read of size 4 at addr 0000000000000020 by task syz-executor1/15452
At a glance, this looks like it was fixed already by
https://www.mail-archive.com/netdev@xxxxxxxxxxxxxxx/msg175226.html
Can you recheck with that patch, or verify that you already have it?
Thanks.
