linux-kernel - Re: [PATCH v4 0/3] UBSAN: run-time undefined behavior sanity checker

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Message-Id: <20151204163747.0bb51d61832ac75bfc73ce0c@linux-foundation.org>
Date:	Fri, 4 Dec 2015 16:37:47 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc:	<linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Jonathan Corbet <corbet@....net>,
	Michal Marek <mmarek@...e.cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Yury Gribov <y.gribov@...sung.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Kostya Serebryany <kcc@...gle.com>, <x86@...nel.org>,
	<linux-doc@...r.kernel.org>, <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH v4 0/3] UBSAN: run-time undefined behavior sanity
 checker

On Thu, 3 Dec 2015 18:50:04 +0300 Andrey Ryabinin <aryabinin@...tuozzo.com> wrote:

> UBSAN is run-time undefined behaviour checker. It uses compile-time
> instrumentation to catch undefined behavior (UB). Compiler inserts code
> that perform certain kinds of checks before operations that could cause UB.
> If check fails (i.e. UB detected) __ubsan_handle_* function called to print error message.

What I'd like to see in this changelog is a description of any kernel
issues which this checker has already identified: what were they and
what was their potential impact at runtime.

This info will help us to understand the value of the proposed feature.

Thanks.
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