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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 <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Matt Fleming <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Ard Biesheuvel 2017-08-18 20:49:36 +01:00 • committed by Ingo Molnar
commit 0426a4e68f
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"