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

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Message-Id: <20180705165842.856d66594bf695f4f688ccfa@linux-foundation.org>
Date:   Thu, 5 Jul 2018 16:58:42 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Ian Kent <raven@...maw.net>
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 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?

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

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