From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Matthias Kaehlcke <mka@chromium.org>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Matt Fleming <matt@codeblueprint.co.uk>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
linux-efi@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>
Subject: [PATCH 4.9 29/59] efi/libstub/arm64: Force hidden visibility for section markers
Date: Wed, 21 Nov 2018 20:06:44 +0100 [thread overview]
Message-ID: <20181121183509.397770471@linuxfoundation.org> (raw)
In-Reply-To: <20181121183508.262873520@linuxfoundation.org>
4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
commit 0426a4e68f18d75515414361de9e3e1445d2644e upstream.
To prevent the compiler from emitting absolute references to the section
markers when running in PIC mode, override the visibility to 'hidden' for
all contents of asm/sections.h
Tested-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20170818194947.19347-4-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/firmware/efi/libstub/arm64-stub.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/drivers/firmware/efi/libstub/arm64-stub.c
+++ b/drivers/firmware/efi/libstub/arm64-stub.c
@@ -9,9 +9,17 @@
* published by the Free Software Foundation.
*
*/
+
+/*
+ * To prevent the compiler from emitting GOT-indirected (and thus absolute)
+ * references to the section markers, override their visibility as 'hidden'
+ */
+#pragma GCC visibility push(hidden)
+#include <asm/sections.h>
+#pragma GCC visibility pop
+
#include <linux/efi.h>
#include <asm/efi.h>
-#include <asm/sections.h>
#include <asm/sysreg.h>
#include "efistub.h"
next prev parent reply other threads:[~2018-11-21 19:06 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20181121183508.262873520@linuxfoundation.org>
2018-11-21 19:06 ` [PATCH 4.9 28/59] efi/libstub/arm64: Use hidden attribute for struct screen_info reference Greg Kroah-Hartman
2018-11-21 19:06 ` Greg Kroah-Hartman [this message]
2018-11-21 19:06 ` [PATCH 4.9 30/59] efi/libstub: Preserve .debug sections after absolute relocation check Greg Kroah-Hartman
2018-11-21 19:06 ` [PATCH 4.9 31/59] efi/libstub/arm64: Set -fpie when building the EFI stub Greg Kroah-Hartman
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