linux-kernel - Re: [PATCH v2 mips-next 1/4] MIPS: vmlinux.lds.S: add missing PAGE_ALIGNED

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Message-ID: <202101061407.5E63FAB771@keescook>
Date:   Wed, 6 Jan 2021 14:07:25 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Alexander Lobakin <alobakin@...me>
Cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Nathan Chancellor <natechancellor@...il.com>,
        Fangrui Song <maskray@...gle.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Alex Smith <alex.smith@...tec.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Markos Chandras <markos.chandras@...tec.com>,
        linux-mips@...r.kernel.org, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 mips-next 1/4] MIPS: vmlinux.lds.S: add missing
 PAGE_ALIGNED_DATA() section

On Wed, Jan 06, 2021 at 08:08:14PM +0000, Alexander Lobakin wrote:
> MIPS uses its own declaration of rwdata, and thus it should be kept
> in sync with the asm-generic one. Currently PAGE_ALIGNED_DATA() is
> missing from the linker script, which emits the following ld
> warnings:
> 
> mips-alpine-linux-musl-ld: warning: orphan section
> `.data..page_aligned' from `arch/mips/kernel/vdso.o' being placed
> in section `.data..page_aligned'
> mips-alpine-linux-musl-ld: warning: orphan section
> `.data..page_aligned' from `arch/mips/vdso/vdso-image.o' being placed
> in section `.data..page_aligned'
> 
> Add the necessary declaration, so the mentioned structures will be
> placed in vmlinux as intended:
> 
> ffffffff80630580 D __end_once
> ffffffff80630580 D __start___dyndbg
> ffffffff80630580 D __start_once
> ffffffff80630580 D __stop___dyndbg
> ffffffff80634000 d mips_vdso_data
> ffffffff80638000 d vdso_data
> ffffffff80638580 D _gp
> ffffffff8063c000 T __init_begin
> ffffffff8063c000 D _edata
> ffffffff8063c000 T _sinittext
> 
> ->
> 
> ffffffff805a4000 D __end_init_task
> ffffffff805a4000 D __nosave_begin
> ffffffff805a4000 D __nosave_end
> ffffffff805a4000 d mips_vdso_data
> ffffffff805a8000 d vdso_data
> ffffffff805ac000 D mmlist_lock
> ffffffff805ac080 D tasklist_lock
> 
> Fixes: ebb5e78cc634 ("MIPS: Initial implementation of a VDSO")
> Cc: stable@...r.kernel.org # 4.4+
> Signed-off-by: Alexander Lobakin <alobakin@...me>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook