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

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Date:	Wed, 7 Jan 2015 10:28:45 -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 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>
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