linux-kernel - Re: [PATCH v3 2/2] UBSAN: run-time undefined behavior sanity checker

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Date:	Mon, 30 Nov 2015 13:50:54 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	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 v3 2/2] UBSAN: run-time undefined behavior sanity checker

On 11/30/2015 10:59 AM, Andrey Ryabinin wrote:
> +void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data,
> +					unsigned long lhs, unsigned long rhs)
> +{
> +	unsigned long flags;
> +	struct type_descriptor *rhs_type = data->rhs_type;
> +	struct type_descriptor *lhs_type = data->lhs_type;
> +	char rhs_str[VALUE_LENGTH];
> +	char lhs_str[VALUE_LENGTH];
> +
> +	if (suppress_report(&data->location))
> +		return;
> +
> +	ubsan_prologue(&data->location, &flags);
> +
> +	val_to_string(rhs_str, sizeof(rhs_str), rhs_type, rhs);
> +	val_to_string(lhs_str, sizeof(lhs_str), lhs_type, lhs);
> +
> +	if (val_is_negative(rhs_type, rhs))
> +		pr_err("shift exponent %s is negative\n", rhs_str);
> +
> +	else if (get_unsigned_val(rhs_type, rhs) >=
> +		type_bit_width(lhs_type))
> +		pr_err("shift exponent %s is to large for %u-bit type %s\n",
					     too

Otherwise looks great, I'm running fuzzing with it now.


Thanks,
Sasha
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