linux-kernel - [tip: core/build] arm/boot: Warn on orphan section placement

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Date:   Mon, 07 Sep 2020 06:05:51 -0000
From:   "tip-bot2 for Kees Cook" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>, Ingo Molnar <mingo@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: core/build] arm/boot: Warn on orphan section placement

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

Commit-ID:     4409d2f8dfe7d5088567d4ba00133f876ee586c7
Gitweb:        https://git.kernel.org/tip/4409d2f8dfe7d5088567d4ba00133f876ee586c7
Author:        Kees Cook <keescook@...omium.org>
AuthorDate:    Tue, 01 Sep 2020 19:53:45 -07:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Thu, 03 Sep 2020 10:28:35 +02:00

arm/boot: Warn on orphan section placement

We don't want to depend on the linker's orphan section placement
heuristics as these can vary between linkers, and may change between
versions. All sections need to be explicitly handled in the linker script.

With all sections now handled, enable orphan section warning.

Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
Link: https://lore.kernel.org/r/20200902025347.2504702-4-keescook@chromium.org
---
 arch/arm/boot/compressed/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index b1147b7..58028ab 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -123,6 +123,8 @@ endif
 LDFLAGS_vmlinux += --no-undefined
 # Delete all temporary local symbols
 LDFLAGS_vmlinux += -X
+# Report orphan sections
+LDFLAGS_vmlinux += $(call ld-option, --orphan-handling=warn)
 # Next argument is a linker script
 LDFLAGS_vmlinux += -T