[PATCH v5 23/36] arm/build: Explicitly keep .ARM.attributes sections

Kees Cook
2020-07-31T23:08:07Z

In preparation for adding --orphan-handling=warn, explicitly keep the
.ARM.attributes section by expanding the existing ELF_DETAILS macro into
ARM_DETAILS.

Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/lkml/CAKwvOdk-racgq5pxsoGS6Vtifbtrk5fmkmnoLxrQMaOvV0nPWw@mail.gmail.com/
Signed-off-by: Kees Cook <keescook@chromium.org>
---
arch/arm/include/asm/vmlinux.lds.h | 4 ++++
arch/arm/kernel/vmlinux-xip.lds.S | 2 +-
arch/arm/kernel/vmlinux.lds.S | 2 +-
3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/arm/include/asm/vmlinux.lds.h b/arch/arm/include/asm/vmlinux.lds.h
index a08f4301b718..c4af5182ab48 100644
--- a/arch/arm/include/asm/vmlinux.lds.h
+++ b/arch/arm/include/asm/vmlinux.lds.h
@@ -52,6 +52,10 @@
ARM_MMU_DISCARD(*(__ex_table)) \
COMMON_DISCARDS

+#define ARM_DETAILS \
+ ELF_DETAILS \
+ .ARM.attributes 0 : { *(.ARM.attributes) }
+
#define ARM_STUBS_TEXT \
*(.gnu.warning) \
*(.glue_7) \
diff --git a/arch/arm/kernel/vmlinux-xip.lds.S b/arch/arm/kernel/vmlinux-xip.lds.S
index 904c31fa20ed..57fcbf55f913 100644
--- a/arch/arm/kernel/vmlinux-xip.lds.S
+++ b/arch/arm/kernel/vmlinux-xip.lds.S
@@ -150,7 +150,7 @@ SECTIONS
_end = .;

STABS_DEBUG
- ELF_DETAILS
+ ARM_DETAILS
}

/*
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S
index bb950c896a67..1d3d3b599635 100644
--- a/arch/arm/kernel/vmlinux.lds.S
+++ b/arch/arm/kernel/vmlinux.lds.S
@@ -149,7 +149,7 @@ SECTIONS
_end = .;

STABS_DEBUG
- ELF_DETAILS
+ ARM_DETAILS
}

#ifdef CONFIG_STRICT_KERNEL_RWX
--
2.25.1