linux-kernel - Re: KASAN: slab-out-of-bounds Read in string (2)

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Message-ID: <20181025150219.GA5539@fieldses.org>
Date:   Thu, 25 Oct 2018 11:02:19 -0400
From:   Bruce Fields <bfields@...ldses.org>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     Amir Goldstein <amir73il@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot+376cea2b0ef340db3dd4@...kaller.appspotmail.com,
        Miklos Szeredi <miklos@...redi.hu>,
        overlayfs <linux-unionfs@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Petr Mladek <pmladek@...e.com>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        syzkaller-bugs@...glegroups.com, Jan Harkes <jaharkes@...cmu.edu>,
        Mark Fasheh <mark@...heh.com>
Subject: Re: KASAN: slab-out-of-bounds Read in string (2)

On Wed, Oct 24, 2018 at 06:40:35AM -0400, Jeff Layton wrote:
> On Wed, 2018-10-24 at 12:35 +0300, Amir Goldstein wrote:
> > > > diff --git a/fs/lockd/host.c b/fs/lockd/host.c
> > > > index d35cd6be0675..93fb7cf0b92b 100644
> > > > --- a/fs/lockd/host.c
> > > > +++ b/fs/lockd/host.c
> > > > @@ -341,7 +341,7 @@ struct nlm_host *nlmsvc_lookup_host(const struct
> > > > svc_rqst *rqstp,
> > > >         };
> > > >         struct lockd_net *ln = net_generic(net, lockd_net_id);
> > > > 
> > > > -       dprintk("lockd: %s(host='%*s', vers=%u, proto=%s)\n", __func__,
> > > > +       dprintk("lockd: %s(host='%.*s', vers=%u, proto=%s)\n", __func__,
> > > >                         (int)hostname_len, hostname, rqstp->rq_vers,
> > > >                         (rqstp->rq_prot == IPPROTO_UDP ? "udp" : "tcp"));
> > > > 
> > > 
> > > Why wasn't this one applied?  It looks correct to me.  The rest seem to
> > > have been fixed already.
> > > 
> > 
> > I did not send this patch to Jeff.
> > Jeff was CC'ed on the patch I sent to Miklos
> > and Miklos decided to only take the overlayfs bits:
> > https://marc.info/?l=linux-unionfs&m=153847248625015&w=2
> > 
> > So I guess it has fallen between the cracks.
> > Feel free to send a patch to Jeff.
> > 
> > Thanks,
> > Amir.
> 
> Actually, this should probably go to Bruce, as he mostly takes care of
> lockd. Patch looks correct though.

Yes, if you could resend I'd be happy to handle it.--b.