linux-kernel - Re: [PATCH] s390: disable postinit-readonly for now

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Message-ID: <20160312111540.GA17395@osiris>
Date:	Sat, 12 Mar 2016 12:15:40 +0100
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH] s390: disable postinit-readonly for now

On Thu, Mar 10, 2016 at 09:31:44AM -0800, Kees Cook wrote:
> This is a temporary fix to let lkdtm run again on s390, though it'll
> still fail the ro_after_init tests. Until rodata and ro_after_init
> sections can be split on s390, disable special handling of ro_after_init.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
> for -next ...
> ---
>  arch/s390/include/asm/cache.h | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/s390/include/asm/cache.h b/arch/s390/include/asm/cache.h
> index 4d7ccac5fd1d..22da3b34c655 100644
> --- a/arch/s390/include/asm/cache.h
> +++ b/arch/s390/include/asm/cache.h
> @@ -15,4 +15,7 @@
> 
>  #define __read_mostly __attribute__((__section__(".data..read_mostly")))
> 
> +/* Read-only memory is marked before mark_rodata_ro() is called. */
> +#define __ro_after_init __read_mostly
> +
>  #endif

Acked-by: Heiko Carstens <heiko.carstens@...ibm.com>