linux-kernel - [RFC PATCH 0/2] add ktime_sub_safe() to avoid undefined behaviour

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Message-ID: <20190306131326.10275-1-yaohongbo@huawei.com>
Date:   Wed, 6 Mar 2019 21:13:24 +0800
From:   Hongbo Yao <yaohongbo@...wei.com>
To:     <tglx@...utronix.de>, <edumazet@...gle.com>,
        <linux-kernel@...r.kernel.org>, <yaohongbo@...wei.com>
Subject: [RFC PATCH 0/2] add ktime_sub_safe() to avoid undefined behaviour

When I ran Syzkaller testsuite, I got some UBSAN warnings with
ktime_sub().

Instead of putting overflow checks into each place, add a function
which does the sanity checking and convert all affected callers to use
it.

Hongbo Yao (2):
  ktime: add ktime_sub_safe() to avoid undefined behaviour
  hrtimer: Prevent overflow for relative refrences

 include/linux/ktime.h |  8 ++++++++
 kernel/time/hrtimer.c | 21 +++++++++++++++++++--
 2 files changed, 27 insertions(+), 2 deletions(-)

-- 
2.20.1