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

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Date: Thu, 16 May 2024 16:55:19 -0700
From: Justin Stitt <justinstitt@...gle.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: John Stultz <jstultz@...gle.com>, Stephen Boyd <sboyd@...nel.org>, 
	Nathan Chancellor <nathan@...nel.org>, Bill Wendling <morbo@...gle.com>, linux-kernel@...r.kernel.org, 
	llvm@...ts.linux.dev, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] ntp: remove accidental integer wrap-around

On Thu, May 16, 2024 at 4:40 PM Justin Stitt <justinstitt@...gle.com> wrote:
> Isn't this usually supplied from the user and can be some pretty
> random stuff? Are you suggesting we update
> timekeeping_validate_timex() to include a check to limit the maxerror
> field to (NTP_PHASE_LIMIT-(MAXFREQ / NSEC_PER_USEC))? It seems like we
> should handle the overflow case where it happens: in
> second_overflow().

Or, I suppose we could add a check to timekeeping_validate_timex() like:

if (txc->modes & ADJ_MAXERROR) {
    if (txc->maxerror < 0 || txc->maxerror > NTP_PHASE_LIMIT)
        return -EINVAL;
}


> Thanks
> Justin