linux-kernel - Re: [PATCH 1/2] ubsan: allow to disable the null sanitizer

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Date:   Tue, 13 Sep 2016 08:46:22 +0200
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Christian Borntraeger <borntraeger@...ibm.com>
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Michal Marek <mmarek@...e.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Yang Shi <yang.shi@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 1/2] ubsan: allow to disable the null sanitizer

On Mon, Sep 12, 2016 at 02:37:19PM +0200, Christian Borntraeger wrote:
> Some architectures use a hardware defined struct at address zero.
> Checking for a null pointer will result in many ubsan reports.
> Let users disable the null sanitizer.
> 
> Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
> ---
>  lib/Kconfig.ubsan      | 11 +++++++++++
>  scripts/Makefile.ubsan |  5 ++++-
>  2 files changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
> index 39494af..851c3f2 100644
> --- a/lib/Kconfig.ubsan
> +++ b/lib/Kconfig.ubsan
> @@ -1,6 +1,9 @@
>  config ARCH_HAS_UBSAN_SANITIZE_ALL
>  	bool
> 
> +config ARCH_WANTS_UBSAN_NO_NULL
> +	def_bool n
> +
>  config UBSAN
>  	bool "Undefined behaviour sanity checker"
>  	help
> @@ -34,3 +37,11 @@ config UBSAN_ALIGNMENT
>  	  This option enables detection of unaligned memory accesses.
>  	  Enabling this option on architectures that support unaligned
>  	  accesses may produce a lot of false positives.
> +
> +config UBSAN_NULL
> +	bool "Enable checking of null pointers"
> +	depends on UBSAN
> +	default y if UBSAN && !ARCH_WANTS_UBSAN_NO_NULL

I removed the not needed UBSAN from the "default y" and applied both
patches to the s390 tree.

Thanks!