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BACKPORT: 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 0426a4e68f18d75515414361de9e3e1445d2644e)
Signed-off-by: Greg Hackmann <ghackmann@google.com>

Change-Id: Ia438c3f0aa6abdbd9057dfe1db732a25aa98ef40
This commit is contained in:
Ard Biesheuvel 2017-08-18 20:49:36 +01:00 • committed by Greg Hackmann
parent 75eb3438b2
commit 00b6078ea6
1 changed files with 9 additions and 1 deletions
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10
drivers/firmware/efi/libstub/arm64-stub.c
View file

@ -9,9 +9,17 @@
* published by the Free Software Foundation. * 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 <linux/efi.h>
#include <asm/efi.h> #include <asm/efi.h>
#include <asm/sections.h>
#include "efistub.h" #include "efistub.h"