Re: [PATCH] autofs - fix slab out of bounds read in getname_kernel()

[Ian Kent <raven@themaw.net>]

On Thu, 2018-07-05 at 16:58 -0700, Andrew Morton wrote:
> On Tue, 03 Jul 2018 14:45:15 +0800 Ian Kent <raven@themaw.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@gmail.com>
> > Signed-off-by: Ian Kent <raven@themaw.net>
> > Reported-by: syzbot+60c837b428dc84e83a93@syzkaller.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