linux-kernel - [tip: core/build] arm/build: Explicitly keep .ARM.attributes sections

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Date:   Tue, 01 Sep 2020 11:47:55 -0000
From:   "tip-bot2 for Kees Cook" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Ingo Molnar <mingo@...nel.org>,
        Fangrui Song <maskray@...gle.com>,
        Russell King <linux@...linux.org.uk>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: core/build] arm/build: Explicitly keep .ARM.attributes sections

The following commit has been merged into the core/build branch of tip:

Commit-ID:     3b14aefb84320ac430cecbdc87b680317916b2bd
Gitweb:        https://git.kernel.org/tip/3b14aefb84320ac430cecbdc87b680317916b2bd
Author:        Kees Cook <keescook@...omium.org>
AuthorDate:    Fri, 21 Aug 2020 12:42:57 -07:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 01 Sep 2020 10:03:18 +02:00

arm/build: Explicitly keep .ARM.attributes sections

In preparation for adding --orphan-handling=warn, explicitly keep the
.ARM.attributes section (at address 0[1]) by expanding the existing
ELF_DETAILS macro into ARM_DETAILS.

[1] https://reviews.llvm.org/D85867

Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Fangrui Song <maskray@...gle.com>
Cc: Russell King <linux@...linux.org.uk>
Link: https://lore.kernel.org/lkml/CAKwvOdk-racgq5pxsoGS6Vtifbtrk5fmkmnoLxrQMaOvV0nPWw@mail.gmail.com/
Link: https://lore.kernel.org/r/20200821194310.3089815-17-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 a08f430..c4af518 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 904c31f..57fcbf5 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 bb950c8..1d3d3b5 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