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

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Message-ID: <CALAqxLUSzc8yePiQS=5=C6q73eWm87yPfp_ZjXh8Nh=ydE592Q@mail.gmail.com>
Date:	Wed, 7 Jan 2015 11:02:01 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Greg KH <greg@...ah.com>
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 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?

thanks
-john
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