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

From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	[patch 0/2] timers: Prevent multiplication overflow in timespec/val conversions
Date	2017-06-20 17:50 +0200
Message-ID	<tUtzH-238-7@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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

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[patch 0/2] timers: Prevent multiplication overflow in timespec/val  conversions Thomas Gleixner <tglx@linutronix.de> - 2017-06-20 17:50 +0200
  [patch 1/2] itimer: Make timeval to nsec conversion range limited Thomas Gleixner <tglx@linutronix.de> - 2017-06-20 17:50 +0200
    [tip:timers/core] itimer: Make timeval to nsec conversion range  limited tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2017-06-20 21:50 +0200
  [patch 2/2] posix-cpu-timers: Make timespec to nsec conversion safe Thomas Gleixner <tglx@linutronix.de> - 2017-06-20 17:50 +0200
    [tip:timers/core] posix-cpu-timers: Make timespec to nsec  conversion safe tip-bot for Thomas Gleixner <tipbot@zytor.com> - 2017-06-20 21:50 +0200

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