linux-kernel - [PATCH v2 10/18] arm64: add a workaround for GNU gold with ARM64_MODULE

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Message-Id: <20171115213428.22559-11-samitolvanen@google.com>
Date:   Wed, 15 Nov 2017 13:34:20 -0800
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Alex Matveev <alxmtvv@...il.com>, Andi Kleen <ak@...ux.intel.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Greg Hackmann <ghackmann@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Maxim Kuvyrkov <maxim.kuvyrkov@...aro.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Yury Norov <ynorov@...iumnetworks.com>,
        Matthias Kaehlcke <mka@...omium.org>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH v2 10/18] arm64: add a workaround for GNU gold with ARM64_MODULE_PLTS

CONFIG_CLANG_LTO depends on GNU gold and due to a known bug, the
linker crashes when ARM64_MODULE_PLTS is enabled:

  https://sourceware.org/bugzilla/show_bug.cgi?id=14592

To work around the problem, this change removes NOLOAD from .plt
and .init.plt, which allows us to link modules with ld.gold.

Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
 arch/arm64/kernel/module.lds | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kernel/module.lds b/arch/arm64/kernel/module.lds
index f7c9781a9d48..eacb5c67f61e 100644
--- a/arch/arm64/kernel/module.lds
+++ b/arch/arm64/kernel/module.lds
@@ -1,4 +1,4 @@
 SECTIONS {
-	.plt (NOLOAD) : { BYTE(0) }
-	.init.plt (NOLOAD) : { BYTE(0) }
+	.plt : { BYTE(0) }
+	.init.plt : { BYTE(0) }
 }
-- 
2.15.0.448.gf294e3d99a-goog