linux-kernel - Re: [RFC PATCH] UBSan: run-time undefined behavior sanity checker

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Date:	Tue, 21 Oct 2014 14:09:14 +0400
From:	Andrey Ryabinin <a.ryabinin@...sung.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	Sasha Levin <sasha.levin@...cle.com>, x86@...nel.org,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
	Theodore Ts'o <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Khlebnikov <koct9i@...il.com>
Subject: Re: [RFC PATCH] UBSan: run-time undefined behavior sanity checker

On 10/21/2014 01:47 PM, Peter Zijlstra wrote:
> On Mon, Oct 20, 2014 at 02:54:59PM +0400, Andrey Ryabinin wrote:
>>
>> UBSan 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.
>>
>> So the most of the work is done by compiler.
>> This patch just implements ubsan handlers printing errors.
>>
>> GCC supports this since 4.9, however upcoming GCC 5.0 has
>> more checkers implemented.
> 
> It might be useful if you've got a link to the relevant GCC
> documentation of this new shiny stuf.
> 

Documentation is very brief (look for fsanitize=undefined): https://gcc.gnu.org/onlinedocs/gcc/Debugging-Options.html
GCC 4.9.1 doc: https://gcc.gnu.org/onlinedocs/gcc-4.9.1/gcc/Debugging-Options.html

And there is an article which might be interesting: http://developerblog.redhat.com/2014/10/16/gcc-undefined-behavior-sanitizer-ubsan/



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