[PATCH net v3 2/2] security: implement sctp_assoc_established hook in selinux

[Paul Moore]

On Mon, Feb 14, 2022 at 11:13 PM Xin Long <lucien.xin at gmail.com> wrote:
> Looks okay to me.
>
> The difference from the old one is that: with
> selinux_sctp_process_new_assoc() called in
> selinux_sctp_assoc_established(), the client sksec->peer_sid is using
> the first asoc's peer_secid, instead of the latest asoc's peer_secid.
> And not sure if it will cause any problems when doing the extra check
> sksec->peer_sid != asoc->peer_secid for the latest asoc and *returns
> err*. But I don't know about selinux, I guess there must be a reason
> from selinux side.

Generally speaking we don't want to change any SELinux socket labels
once it has been created.  While the peer_sid is a bit different,
changing it after userspace has access to the socket could be
problematic.  In the case where the peer_sid differs between the two
we have a permission check which allows policy to control this
behavior which seems like the best option at this point.

> I will ACK on patch 0/2.

Thanks, I'm going to go ahead and merge these two patches into
selinux/next right now.

-- 
paul-moore.com