On Fri, Dec 06, 2019 at 02:13:45PM -0800, Sami Tolvanen wrote:

Reserve the x18 register from general allocation when SCS is enabled,
because the compiler uses the register to store the current task's
shadow stack pointer. Note that all external kernel modules must also be
compiled with -ffixed-x18 if the kernel has SCS enabled.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Nick Desaulniers <redacted>
Reviewed-by: Kees Cook <redacted>
---
 arch/arm64/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

Acked-by: Will Deacon <will@kernel.org>

Will

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel