[PATCH 03/14] efi/libstub: arm64: force 'hidden' visibility for section markers
From: Ard Biesheuvel <hidden>
Date: 2017-08-18 19:53:03
Also in:
lkml
Subsystem:
extensible firmware interface (efi), the rest · Maintainers:
Ard Biesheuvel, Linus Torvalds
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 Cc: Matt Fleming <matt-mF/unelCI9GS6iBeEJttW/XRex20P6io@public.gmane.org> Tested-by: Matthias Kaehlcke <redacted> Signed-off-by: Ard Biesheuvel <redacted> --- drivers/firmware/efi/libstub/arm64-stub.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/efi/libstub/arm64-stub.c b/drivers/firmware/efi/libstub/arm64-stub.c
index b4c2589d7c91..f7a6970e9abc 100644
--- 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"
--
2.11.0