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UPSTREAM: efi/libstub/arm64: Force 'hidden' visibility for section markers

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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>
(cherry picked from commit 0426a4e68f)

Change-Id: Ie46c542b5d20ca0d21532152eda7007994fd6af7
This commit is contained in:
Ard Biesheuvel
2017-08-18 20:49:36 +01:00
committed by Greg Hackmann
parent 19445a0705
commit 5f9b5e6524
1 changed files with 9 additions and 1 deletions
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10
drivers/firmware/efi/libstub/arm64-stub.c
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@@ -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"