linux-kernel - Re: [PATCH v2 06/29] s390: Move RO_DATA into "text" PT

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Message-Id: <20191016082516.GB4267@osiris>
Date:   Wed, 16 Oct 2019 10:25:16 +0200
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Borislav Petkov <bp@...en8.de>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Will Deacon <will@...nel.org>, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-alpha@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-c6x-dev@...ux-c6x.org,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Michal Simek <monstr@...str.eu>, linux-parisc@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/29] s390: Move RO_DATA into "text" PT_LOAD Program
 Header

On Thu, Oct 10, 2019 at 05:05:46PM -0700, Kees Cook wrote:
> In preparation for moving NOTES into RO_DATA, move RO_DATA back into the
> "text" PT_LOAD Program Header, as done with other architectures. The
> "data" PT_LOAD now starts with the writable data section.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  arch/s390/kernel/vmlinux.lds.S | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S
> index 7e0eb4020917..13294fef473e 100644
> --- a/arch/s390/kernel/vmlinux.lds.S
> +++ b/arch/s390/kernel/vmlinux.lds.S
> @@ -52,7 +52,7 @@ SECTIONS
> 
>  	NOTES :text :note
> 
> -	.dummy : { *(.dummy) } :data
> +	.dummy : { *(.dummy) } :text
> 
>  	RO_DATA_SECTION(PAGE_SIZE)
> 
> @@ -64,7 +64,7 @@ SECTIONS
>  	.data..ro_after_init : {
>  		 *(.data..ro_after_init)
>  		JUMP_TABLE_DATA
> -	}
> +	} :data
>  	EXCEPTION_TABLE(16)
>  	. = ALIGN(PAGE_SIZE);
>  	__end_ro_after_init = .;

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