linux-kernel - Re: [PATCH] autofs - fix slab out of bounds read in getname

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Message-ID: <1530839316.2940.5.camel@themaw.net>
Date:   Fri, 06 Jul 2018 09:08:36 +0800
From:   Ian Kent <raven@...maw.net>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Tomas Bortoli <tomasbortoli@...il.com>,
        autofs mailing list <autofs@...r.kernel.org>,
        Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH] autofs - fix slab out of bounds read in getname_kernel()

On Thu, 2018-07-05 at 16:58 -0700, Andrew Morton wrote:
> On Tue, 03 Jul 2018 14:45:15 +0800 Ian Kent <raven@...maw.net> wrote:
> 
> > Initial patch contributed by Tomas Bortoli.
> > 
> > The autofs subsystem does not check that the "path" parameter is
> > present for all cases where it is required when it is passed in
> > via the "param" struct.
> > 
> > In particular it isn't checked for the AUTOFS_DEV_IOCTL_OPENMOUNT_CMD
> > ioctl command.
> > 
> > To solve it, modify validate_dev_ioctl() function to check that a
> > path has been provided for ioctl commands that require it.
> > 
> > Signed-off-by: Tomas Bortoli <tomasbortoli@...il.com>
> > Signed-off-by: Ian Kent <raven@...maw.net>
> > Reported-by: syzbot+60c837b428dc84e83a93@...kaller.appspotmail.com
> 
> So who is the primary author of this?  I'm assuming "Tomas" from the
> signoff order?

Yes, Tomas was the originator but I did change it somewhat so added
my Signed-off-by as well.

> 
> The way of signifying this is to put the other author's From: line right
> at the top of changelog.

Oh, ok, will do in future, although my changes were fairly significant.

IMHO it was a joint effort more or less equal by both of us.
Nevertheless I would have been happy to list Tomas as the From author.

> 
> I assume this is a root-only bug, so we don't need to backport the fix?

It is, so yes that's right, unless Tomas has other recommendations.

Ian