linux-hardening - Re: [PATCH v2] ntp: remove accidental integer wrap-around

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Message-ID: <87le3yddnm.ffs@tglx>
Date: Sat, 25 May 2024 00:54:21 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Justin Stitt <justinstitt@...gle.com>
Cc: John Stultz <jstultz@...gle.com>, Stephen Boyd <sboyd@...nel.org>,
 Nathan Chancellor <nathan@...nel.org>, Bill Wendling <morbo@...gle.com>,
 Nick Desaulniers <ndesaulniers@...gle.com>, linux-kernel@...r.kernel.org,
 llvm@...ts.linux.dev, linux-hardening@...r.kernel.org, Miroslav Lichvar
 <mlichvar@...hat.com>
Subject: Re: [PATCH v2] ntp: remove accidental integer wrap-around

Justin!

On Fri, May 24 2024 at 15:43, Justin Stitt wrote:
> I appreciate you reviewing my patches.

You're welcome!

> On Fri, May 24, 2024 at 5:09 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>> So instead of turning the clock back, we might be better off to actually
>> put the normalization in place at the assignment:
>>
>>     time_maxerror = min(max(0, txc->maxerror), NTP_PHASE_LIMIT);
>
> A saturating resolution strategy is one that I've taken with some of
> my other overflow patches.
>
> ... but how about: clamp(txc->maxerror, 0, NTP_PHASE_LIMIT)

Duh. You are right, but that's too obvious :)

Thanks,

        tglx