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

Julien Thierry jthierry at redhat.com
Thu Jan 9 08:02:53 PST 2020


From: Raphael Gault <raphael.gault at 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 at arm.com>
Signed-off-by: Julien Thierry <jthierry at redhat.com>
---
 arch/arm64/kernel/Makefile | 3 +++
 1 file changed, 3 insertions(+)

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
-- 
2.21.0




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