linux-kernel - Re: [PATCH 1/2] time: settimeofday: Validate the values of tv from user

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Date:	Wed, 7 Jan 2015 11:09:26 -0800
From:	Greg KH <greg@...ah.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	stable <stable@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH 1/2] time: settimeofday: Validate the values of tv from
 user

On Wed, Jan 07, 2015 at 11:02:01AM -0800, John Stultz wrote:
> On Wed, Jan 7, 2015 at 10:28 AM, Greg KH <greg@...ah.com> wrote:
> > On Wed, Jan 07, 2015 at 10:12:19AM -0800, John Stultz wrote:
> >> From: Sasha Levin <sasha.levin@...cle.com>
> >>
> >> An unvalidated user input is multiplied by a constant, which can result in
> >> an undefined behaviour for large values. While this is validated later,
> >> we should avoid triggering undefined behaviour.
> >>
> >> Cc: Thomas Gleixner <tglx@...utronix.de>
> >> Cc: Ingo Molnar <mingo@...nel.org>
> >> Cc: stable <stable@...r.kernel.org>
> >> Cc: Andy Lutomirski <luto@...capital.net>
> >> Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
> >> [jstultz: include trivial milisecond->microsecond correction noticed
> >> by Andy]
> >> Signed-off-by: John Stultz <john.stultz@...aro.org>
> >> ---
> >>  include/linux/time.h | 13 +++++++++++++
> >>  kernel/time/time.c   |  4 ++++
> >>  2 files changed, 17 insertions(+)
> >
> > <formletter>
> >
> > This is not the correct way to submit patches for inclusion in the
> > stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
> > for how to do this properly.
> >
> > </formletter>
> 
> Hrm. I'm not quite sure which rule I'm running afoul here.
> 
> Does this seem too much like a theoretical issue and not like enough
> of a "oh, that's not good" issue?

No, crap, my fault, I messed up on these, you are doing this just fine,
I'm not awake this morning...

/me goes off to get more coffee.

greg k-h
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