linux-kernel - Re: [PATCH v2 23/29] parisc: Move EXCEPTION_TABLE to RO

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Date:   Sat, 12 Oct 2019 11:50:09 +0200
From:   Helge Deller <deller@....de>
To:     Kees Cook <keescook@...omium.org>, Borislav Petkov <bp@...en8.de>
Cc:     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>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        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,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 23/29] parisc: Move EXCEPTION_TABLE to RO_DATA segment

On 11.10.19 02:06, Kees Cook wrote:
> Since the EXCEPTION_TABLE is read-only, collapse it into RO_DATA.
>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>   arch/parisc/kernel/vmlinux.lds.S | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)


Acked-by: Helge Deller <deller@....de>  # parisc

Helge

>
> diff --git a/arch/parisc/kernel/vmlinux.lds.S b/arch/parisc/kernel/vmlinux.lds.S
> index 12b3d7d5e9e4..53e29d88f99c 100644
> --- a/arch/parisc/kernel/vmlinux.lds.S
> +++ b/arch/parisc/kernel/vmlinux.lds.S
> @@ -19,6 +19,7 @@
>   				*(.data..vm0.pte)
>
>   #define CC_USING_PATCHABLE_FUNCTION_ENTRY
> +#define RO_EXCEPTION_TABLE_ALIGN	8
>
>   #include <asm-generic/vmlinux.lds.h>
>
> @@ -129,9 +130,6 @@ SECTIONS
>
>   	RO_DATA(8)
>
> -	/* RO because of BUILDTIME_EXTABLE_SORT */
> -	EXCEPTION_TABLE(8)
> -
>   	/* unwind info */
>   	.PARISC.unwind : {
>   		__start___unwind = .;
>