linux-kernel - [PATCH v4 13/17] arm/build: Explicitly keep .ARM.attributes sections

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Message-Id: <20200629061840.4065483-14-keescook@chromium.org>
Date:   Sun, 28 Jun 2020 23:18:36 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Will Deacon <will@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Peter Collingbourne <pcc@...gle.com>,
        James Morse <james.morse@....com>,
        Borislav Petkov <bp@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>, x86@...nel.org,
        clang-built-linux@...glegroups.com, linux-arch@...r.kernel.org,
        linux-efi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 13/17] arm/build: Explicitly keep .ARM.attributes sections

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@...gle.com>
Link: https://lore.kernel.org/lkml/CAKwvOdk-racgq5pxsoGS6Vtifbtrk5fmkmnoLxrQMaOvV0nPWw@mail.gmail.com/
Signed-off-by: Kees Cook <keescook@...omium.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 142c038b2e97..c66b16cd8837 100644
--- a/arch/arm/include/asm/vmlinux.lds.h
+++ b/arch/arm/include/asm/vmlinux.lds.h
@@ -56,6 +56,10 @@
 		ARM_MMU_DISCARD(*(__ex_table))				\
 		ARM_COMMON_DISCARD
 
+#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