| From foo@baz Wed Nov 21 18:50:25 CET 2018 |
| From: Ard Biesheuvel <ard.biesheuvel@linaro.org> |
| Date: Fri, 18 Aug 2017 20:49:36 +0100 |
| Subject: efi/libstub/arm64: Force 'hidden' visibility for section markers |
| |
| 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" |
