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From: Kees Cook <keescook@chromium.org>
To: Will Deacon <will@kernel.org>
Cc: Kees Cook <keescook@chromium.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Ard Biesheuvel <ardb@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	Peter Collingbourne <pcc@google.com>,
	James Morse <james.morse@arm.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Nathan Chancellor <natechancellor@gmail.com>,
	clang-built-linux@googlegroups.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v2 1/2] arm64/build: Use common DISCARDS in linker script
Date: Mon, 22 Jun 2020 13:58:14 -0700
Message-ID: <20200622205815.2988115-2-keescook@chromium.org> (raw)
In-Reply-To: <20200622205815.2988115-1-keescook@chromium.org>

Use the common DISCARDS rule for the linker script in an effort to
regularize the linker script to prepare for warning on orphaned
sections. Additionally clean up left-over no-op macros.

Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Will Deacon <will@kernel.org>
---
 arch/arm64/kernel/vmlinux.lds.S | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 6827da7f3aa5..5427f502c3a6 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -6,6 +6,7 @@
  */
 
 #define RO_EXCEPTION_TABLE_ALIGN	8
+#define RUNTIME_DISCARD_EXIT
 
 #include <asm-generic/vmlinux.lds.h>
 #include <asm/cache.h>
@@ -89,10 +90,8 @@ SECTIONS
 	 * matching the same input section name.  There is no documented
 	 * order of matching.
 	 */
+	DISCARDS
 	/DISCARD/ : {
-		EXIT_CALL
-		*(.discard)
-		*(.discard.*)
 		*(.interp .dynamic)
 		*(.dynsym .dynstr .hash .gnu.hash)
 		*(.eh_frame)
-- 
2.25.1


  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-22 20:58 [PATCH v2 0/2] arm64: Warn on orphan section placement Kees Cook
2020-06-22 20:58 ` Kees Cook [this message]
2020-06-22 20:58 ` [PATCH v2 2/2] arm64/build: " Kees Cook
2020-06-23 14:52   ` Will Deacon
2020-06-23 14:59     ` Ard Biesheuvel
2020-06-23 19:18       ` Nick Desaulniers
2020-06-23 21:06       ` Kees Cook
2020-06-23 21:21         ` Ard Biesheuvel
2020-06-24  0:05           ` Kees Cook

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