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From: Alexander Lobakin <alobakin@pm.me>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Alexander Lobakin <alobakin@pm.me>,
	Nathan Chancellor <natechancellor@gmail.com>,
	Kees Cook <keescook@chromium.org>,
	Fangrui Song <maskray@google.com>,
	Jiaxun Yang <jiaxun.yang@flygoat.com>,
	Alex Smith <alex.smith@imgtec.com>,
	Ralf Baechle <ralf@linux-mips.org>,
	Markos Chandras <markos.chandras@imgtec.com>,
	linux-mips@vger.kernel.org, stable@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v2 mips-next 1/4] MIPS: vmlinux.lds.S: add missing PAGE_ALIGNED_DATA() section
Date: Wed, 06 Jan 2021 20:08:14 +0000	[thread overview]
Message-ID: <20210106200801.31993-1-alobakin@pm.me> (raw)
In-Reply-To: <20210106200713.31840-1-alobakin@pm.me>

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@vger.kernel.org # 4.4+
Signed-off-by: Alexander Lobakin <alobakin@pm.me>
---
 arch/mips/kernel/vmlinux.lds.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.S
index 5e97e9d02f98..83e27a181206 100644
--- a/arch/mips/kernel/vmlinux.lds.S
+++ b/arch/mips/kernel/vmlinux.lds.S
@@ -90,6 +90,7 @@ SECTIONS
 
 		INIT_TASK_DATA(THREAD_SIZE)
 		NOSAVE_DATA
+		PAGE_ALIGNED_DATA(PAGE_SIZE)
 		CACHELINE_ALIGNED_DATA(1 << CONFIG_MIPS_L1_CACHE_SHIFT)
 		READ_MOSTLY_DATA(1 << CONFIG_MIPS_L1_CACHE_SHIFT)
 		DATA_DATA
-- 
2.30.0



  reply	other threads:[~2021-01-06 20:09 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-06 20:07 [PATCH v2 mips-next 0/4] MIPS: vmlinux.lds.S sections fix & cleanup Alexander Lobakin
2021-01-06 20:08 ` Alexander Lobakin [this message]
2021-01-06 20:08   ` [PATCH v2 mips-next 2/4] MIPS: vmlinux.lds.S: add ".gnu.attributes" to DISCARDS Alexander Lobakin
2021-01-06 22:07     ` Kees Cook
2021-01-06 22:36       ` Alexander Lobakin
2021-01-06 23:26         ` Kees Cook
2021-01-07 11:59           ` Alexander Lobakin
2021-01-06 22:43       ` Fāng-ruì Sòng
2021-01-06 20:08   ` [PATCH v2 mips-next 3/4] MIPS: vmlinux.lds.S: catch bad .got, .plt and .rel.dyn at link time Alexander Lobakin
2021-01-06 20:21     ` Fāng-ruì Sòng
2021-01-06 20:23     ` Nathan Chancellor
2021-01-06 20:28     ` Alexander Lobakin
2021-01-06 20:08   ` [PATCH v2 mips-next 4/4] MIPS: select ARCH_WANT_LD_ORPHAN_WARN Alexander Lobakin
2021-01-06 22:07     ` Kees Cook
2021-01-06 22:07   ` [PATCH v2 mips-next 1/4] MIPS: vmlinux.lds.S: add missing PAGE_ALIGNED_DATA() section Kees Cook

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