linux-kernel - Re: [PATCH] efi: move some sysfs files to be read-only by root

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Date:   Wed, 6 Dec 2017 07:30:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     "Tobin C. Harding" <me@...in.cc>
Cc:     Matt Fleming <matt@...eblueprint.co.uk>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Dave Young <dyoung@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>
Subject: Re: [PATCH] efi: move some sysfs files to be read-only by root

On Wed, Dec 06, 2017 at 07:50:41AM +1100, Tobin C. Harding wrote:
> On Tue, Dec 05, 2017 at 11:13:43AM +0100, Greg Kroah-Hartman wrote:
> > Thanks to the scripts/leaking_addresses.pl script, it was found that
> > some EFI values should not be readable by non-root users.
> > 
> > So make them root-only, and to do that, add a __ATTR_RO_MODE() macro to
> > make this easier, and use it in other places at the same time.
> > 
> > Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
> > Tested-by: Dave Young <dyoung@...hat.com>
> > Cc: Matt Fleming <matt@...eblueprint.co.uk>
> > Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> > Cc: stable <stable@...r.kernel.org>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > 
> > ---
> >  drivers/firmware/efi/efi.c         |    3 +--
> >  drivers/firmware/efi/esrt.c        |   15 ++++++---------
> >  drivers/firmware/efi/runtime-map.c |   10 +++++-----
> >  include/linux/sysfs.h              |    5 +++++
> >  4 files changed, 17 insertions(+), 16 deletions(-)
> > 
> > --- a/drivers/firmware/efi/efi.c
> > +++ b/drivers/firmware/efi/efi.c
> > @@ -143,8 +143,7 @@ static ssize_t systab_show(struct kobjec
> >  	return str - buf;
> >  }
> 
> Greg, do you add the CC's here in the commit log for a technical reason?
> Is it so that future investigation that leads to this commit can see who
> to involve in any further discussion?

They came from the output of scripts/get_maintainer.pl on who I should
be sending the patch to, and who should hopefully review it.

> As an example, for the patch that added the %p hashing should I have
> CC'd Jason A. Donenfeld since he was the brains behind the SipHash
> stuff and gave loads of suggestions/direction?

If you want to.  It's also a good way for me to track who the patch gets
sent to when doing multiple versions of a patch series.  git send-email
picks those up and sends the patch to them as well, making it easier on
the developer instead of having to remember a long --cc= list of
addresses.

thanks,

greg k-h