linux-kernel - [RFC 13/16] arm64: kernel: Add exception on kuser32 to prevent stack analysis

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Message-Id: <20190516103655.5509-14-raphael.gault@arm.com>
Date:   Thu, 16 May 2019 11:36:52 +0100
From:   Raphael Gault <raphael.gault@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     jpoimboe@...hat.com, peterz@...radead.org, catalin.marinas@....com,
        will.deacon@....com, julien.thierry@....com,
        Raphael Gault <raphael.gault@....com>
Subject: [RFC 13/16] arm64: kernel: Add exception on kuser32 to prevent stack analysis

kuser32 being used for compatibility, it contains a32 instructions
which are not recognised by objtool when trying to analyse arm64
object files. Thus, we add an exception to skip validation on this
particular file.

Signed-off-by: Raphael Gault <raphael.gault@....com>
---
 arch/arm64/kernel/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index cd434d0719c1..c564f722ebca 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -29,6 +29,9 @@ $(obj)/%.stub.o: $(obj)/%.o FORCE
 
 obj-$(CONFIG_COMPAT)			+= sys32.o kuser32.o signal32.o 	\
 					   sys_compat.o
+
+OBJECT_FILES_NON_STANDARD_kuser32.o := y
+
 obj-$(CONFIG_FUNCTION_TRACER)		+= ftrace.o entry-ftrace.o
 obj-$(CONFIG_MODULES)			+= module.o
 obj-$(CONFIG_ARM64_MODULE_PLTS)		+= module-plts.o
-- 
2.17.1