diff mbox series

[03/14] efi/libstub: arm64: force 'hidden' visibility for section markers

Message ID 20170818194947.19347-4-ard.biesheuvel@linaro.org
State Accepted
Commit 0426a4e68f18d75515414361de9e3e1445d2644e
Headers show
Series None | expand

Commit Message

Ard Biesheuvel Aug. 18, 2017, 7:49 p.m. UTC 
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@codeblueprint.co.uk>
Tested-by: Matthias Kaehlcke <mka@chromium.org>

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 drivers/firmware/efi/libstub/arm64-stub.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

-- 
2.11.0

--
To unsubscribe from this list: send the line "unsubscribe linux-efi" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
diff mbox series

Patch

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"