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[RFC,v5,50/57] arm64: kernel: Add exception on kuser32 to prevent stack analysis

Message ID 20200109160300.26150-51-jthierry@redhat.com (mailing list archive)
State New, archived
Headers show
Series objtool: Add support for arm64 | expand

Commit Message

Julien Thierry Jan. 9, 2020, 4:02 p.m. UTC 
From: Raphael Gault <raphael.gault@arm.com>

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@arm.com>
Signed-off-by: Julien Thierry <jthierry@redhat.com>
---
 arch/arm64/kernel/Makefile | 3 +++
 1 file changed, 3 insertions(+)
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Patch

diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index fc6488660f64..f5994679db5f 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -33,6 +33,9 @@  ifneq ($(CONFIG_COMPAT_VDSO), y)
 obj-$(CONFIG_COMPAT)			+= sigreturn32.o
 endif
 obj-$(CONFIG_KUSER_HELPERS)		+= kuser32.o
+
+OBJECT_FILES_NON_STANDARD_kuser32.o := y
+
 obj-$(CONFIG_FUNCTION_TRACER)		+= ftrace.o entry-ftrace.o
 obj-$(CONFIG_MODULES)			+= module.o
 obj-$(CONFIG_ARM64_MODULE_PLTS)		+= module-plts.o