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Date:   Thu, 07 Jan 2021 11:54:01 +0000
To:     Thomas Bogendoerfer <tsbogend@alpha.franken.de>
From:   Alexander Lobakin <alobakin@pm.me>
Cc:     Arnd Bergmann <arnd@arndb.de>, Kees Cook <keescook@chromium.org>,
        Nathan Chancellor <natechancellor@gmail.com>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Fangrui Song <maskray@google.com>,
        Huacai Chen <chenhuacai@kernel.org>,
        Pei Huang <huangpei@loongson.cn>,
        Jiaxun Yang <jiaxun.yang@flygoat.com>,
        Alexander Lobakin <alobakin@pm.me>,
        Sami Tolvanen <samitolvanen@google.com>,
        Ingo Molnar <mingo@kernel.org>,
        Ralf Baechle <ralf@linux-mips.org>,
        Corey Minyard <cminyard@mvista.com>,
        linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arch@vger.kernel.org, stable@vger.kernel.org,
        clang-built-linux@googlegroups.com
Reply-To: Alexander Lobakin <alobakin@pm.me>
Subject: [PATCH v3 mips-next 4/7] MIPS: vmlinux.lds.S: catch bad .rel.dyn at link time
Message-ID: <20210107115329.281266-4-alobakin@pm.me>
In-Reply-To: <20210107115329.281266-1-alobakin@pm.me>
References: <20210107115120.281008-1-alobakin@pm.me> <20210107115329.281266-1-alobakin@pm.me>
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Catch any symbols placed in .rel.dyn and check for these sections
to be zero-sized at link time.
Eliminates following ld warning:

mips-alpine-linux-musl-ld: warning: orphan section `.rel.dyn'
from `init/main.o' being placed in section `.rel.dyn'

Adopted from x86/kernel/vmlinux.lds.S.

Suggested-by: Fangrui Song <maskray@google.com>
Signed-off-by: Alexander Lobakin <alobakin@pm.me>
---
 arch/mips/kernel/vmlinux.lds.S | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.=
S
index 0f4e46ea4458..0f736d60d43e 100644
--- a/arch/mips/kernel/vmlinux.lds.S
+++ b/arch/mips/kernel/vmlinux.lds.S
@@ -226,4 +226,15 @@ SECTIONS
 =09=09*(.pdr)
 =09=09*(.reginfo)
 =09}
+
+=09/*
+=09 * Sections that should stay zero sized, which is safer to
+=09 * explicitly check instead of blindly discarding.
+=09 */
+
+=09.rel.dyn : {
+=09=09*(.rel.*)
+=09=09*(.rel_*)
+=09}
+=09ASSERT(SIZEOF(.rel.dyn) =3D=3D 0, "Unexpected run-time relocations (.re=
l) detected!")
 }
--=20
2.30.0