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Date: Mon, 4 Sep 2017 10:09:04 -0700
From: Kees Cook <keescook@...omium.org>
To: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc: "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, Arnd Bergmann <arnd@...db.de>,
Nicolas Pitre <nico@...aro.org>, Russell King <linux@...linux.org.uk>,
Thomas Garnier <thgarnie@...gle.com>, Marc Zyngier <marc.zyngier@....com>,
Mark Rutland <mark.rutland@....com>, Tony Lindgren <tony@...mide.com>,
Matt Fleming <matt@...eblueprint.co.uk>, Dave Martin <dave.martin@....com>
Subject: Re: [PATCH v2 02/29] asm-generic: add .data.rel.ro sections to __ro_after_init
On Sun, Sep 3, 2017 at 5:07 AM, Ard Biesheuvel
<ard.biesheuvel@...aro.org> wrote:
> When running in PIC mode, the compiler will emit const structures
> containing runtime relocatable quantities into .data.rel.ro.* sections,
> so that the linker can be smart about placing them together in a segment
> that is read-write initially, and is remapped read-only afterwards. This
> is exactly what __ro_after_init aims to provide, so move these sections
> together.
>
> Acked-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Acked-by: Kees Cook <keescook@...omium.org>
-Kees
> ---
> include/asm-generic/vmlinux.lds.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> index da0be9a8d1de..d16537b0b102 100644
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -261,7 +261,7 @@
> #ifndef RO_AFTER_INIT_DATA
> #define RO_AFTER_INIT_DATA \
> VMLINUX_SYMBOL(__start_ro_after_init) = .; \
> - *(.data..ro_after_init) \
> + *(.data..ro_after_init .data.rel.ro.*) \
> VMLINUX_SYMBOL(__end_ro_after_init) = .;
> #endif
>
> --
> 2.11.0
>
--
Kees Cook
Pixel Security
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