blob: 4fd321411227bf6f6290022193b29f20a05201d0 [file] [log] [blame]
From fa7bdd456c3365d19ef24a2e34b8a20884a5556b Mon Sep 17 00:00:00 2001
From: Mark Brown <>
Date: Tue, 31 Mar 2020 20:44:59 +0100
Subject: [PATCH] arm64: Always force a branch protection mode when the
compiler has one
commit b8fdef311a0bd9223f10754f94fdcf1a594a3457 upstream.
Compilers with branch protection support can be configured to enable it by
default, it is likely that distributions will do this as part of deploying
branch protection system wide. As well as the slight overhead from having
some extra NOPs for unused branch protection features this can cause more
serious problems when the kernel is providing pointer authentication to
userspace but not built for pointer authentication itself. In that case our
switching of keys for userspace can affect the kernel unexpectedly, causing
pointer authentication instructions in the kernel to corrupt addresses.
To ensure that we get consistent and reliable behaviour always explicitly
initialise the branch protection mode, ensuring that the kernel is built
the same way regardless of the compiler defaults.
[This is a reworked version of b8fdef311a0bd9223f1075 ("arm64: Always
force a branch protection mode when the compiler has one") for backport.
Kernels prior to 74afda4016a7 ("arm64: compile the kernel with ptrauth
return address signing") don't have any Makefile machinery for forcing
on pointer auth but still have issues if the compiler defaults it on so
need this reworked version. -- broonie]
Fixes: 7503197562567 (arm64: add basic pointer authentication support)
Reported-by: Szabolcs Nagy <>
Signed-off-by: Mark Brown <>
[ remove Kconfig option in favour of Makefile check]
Signed-off-by: Catalin Marinas <>
Signed-off-by: Greg Kroah-Hartman <>
[PG: use v5.4.33-stable version for v5.2 ; see v5.7-rc1~34^2~6^2~2]
Signed-off-by: Paul Gortmaker <>
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index e9d2e578cbe6..20bd72e1b8fe 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -67,6 +67,10 @@ stack_protector_prepare: prepare0
+# Ensure that if the compiler supports branch protection we default it
+# off.
+KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none)
KBUILD_CPPFLAGS += -mbig-endian