linux-kernel - [patch 0/2] timers: Prevent multiplication overflow in timespec/val conversions

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Message-Id: <20170620153734.970526461@linutronix.de>
Date:   Tue, 20 Jun 2017 17:37:34 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Xishi Qiu <qiuxishi@...wei.com>
Subject: [patch 0/2] timers: Prevent multiplication overflow in timespec/val
 conversions

KASAN detected a multiplication overflow in the sys_setitimer() timeval
conversion. The same issue is possible the posix-cpu-timer sys_timer_set()
implementation.

In both cases the conversion of the tv_sec part overflows when multiplied
with NSEC_PER_SEC, i.e. 1e9.

This can be mitigated by using the timespec/val_to_ktime() helper, which
prevents the overflow and clamps the result to KTIME_MAX (~292 years).

Thanks,

	tglx