Messages in this thread | | | Date | Thu, 16 Jan 2020 17:37:40 +0000 | From | Will Deacon <> | Subject | Re: [PATCH v6 09/15] arm64: reserve x18 from general allocation with SCS |
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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 <ndesaulniers@google.com> > Reviewed-by: Kees Cook <keescook@chromium.org> > --- > arch/arm64/Makefile | 4 ++++ > 1 file changed, 4 insertions(+)
Acked-by: Will Deacon <will@kernel.org>
Will
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