linux-kernel - Re: [RFC 2/2] kvm: eventfd: detect integer overflow using check_*

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Message-ID: <54761406.9090602@oracle.com>
Date:	Wed, 26 Nov 2014 12:55:18 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Andrey Ryabinin <ryabinin.a.a@...il.com>
CC:	mingo <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 2/2] kvm: eventfd: detect integer overflow using check_*_overflow

On 11/26/2014 12:50 PM, Andrey Ryabinin wrote:
> 2014-11-26 17:00 GMT+03:00 Sasha Levin <sasha.levin@...cle.com>:
>> > Detect integer overflows using safe operations rather than relying on
>> > undefined behaviour.
>> >
> Unsigned overflow is defined.
> args->addr and args->len  both unsigned, so there is no UB here.
> 

Good point. Do you think there's an advantage in using GCC's overflow
checker in this case?


Thanks,
Sasha
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