linux-kernel - Re: [PATCH v2] general protection fault in sock_has

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Date:   Thu, 1 Feb 2018 18:04:47 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Mark Salyzyn <salyzyn@...roid.com>
Cc:     Paul Moore <paul@...l-moore.com>, linux-kernel@...r.kernel.org,
        Paul Moore <paul@...uxfoundation.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Stephen Smalley <sds@...ho.nsa.gov>, selinux@...ho.nsa.gov,
        linux-security-module@...r.kernel.org,
        Eric Paris <eparis@...isplace.org>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        stable <stable@...r.kernel.org>, James Morris <jmorris@...ei.org>
Subject: Re: [PATCH v2] general protection fault in sock_has_perm

On Thu, Feb 01, 2018 at 08:20:13AM -0800, Mark Salyzyn wrote:
> On 02/01/2018 08:00 AM, Paul Moore wrote:
> > On Thu, Feb 1, 2018 at 10:37 AM, Mark Salyzyn <salyzyn@...roid.com> wrote:
> > > In the absence of commit a4298e4522d6 ("net: add SOCK_RCU_FREE socket
> > > flag") and all the associated infrastructure changes to take advantage
> > > of a RCU grace period before freeing, there is a heightened
> > > possibility that a security check is performed while an ill-timed
> > > setsockopt call races in from user space.  It then is prudent to null
> > > check sk_security, and if the case, reject the permissions.
> > > 
> > > . . .
> > > ---[ end trace 7b5aaf788fef6174 ]---
> > > 
> > > Signed-off-by: Mark Salyzyn <salyzyn@...roid.com>
> > > Signed-off-by: Paul Moore <paul@...uxfoundation.org>
> > No, in the previous thread I gave my ack, not my sign-off; please be
> > more careful in the future.  It may seem silly, especially in this
> > particular case, but it is an important distinction when things like
> > the DCO are concerned.
> > 
> > Anyway, here is my ack again.
> > 
> > Acked-by: Paul Moore <paul@...l-moore.com>
> > 
> Ok, both Greg KH and yours should be considered Acked-By. Been overstepping
> this boundary for _years_. AFAIK Signed-off-by is still pending from Stephen
> Smalley <sds@...ho.nsa.gov> before this can roll in.

An ack is all I need here, or I can just rely on Paul's :)
I'll edit up Paul's when I apply this.

thanks,

greg k-h