From: Palmer Dabbelt Date: Wed, 30 Nov 2022 02:35:14 +0000 (-0800) Subject: RISC-V: Align the shadow stack X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b003b3b77d65133a0011ae3b7b255347438c12f6;p=linux.git RISC-V: Align the shadow stack The standard RISC-V ABIs all require 16-byte stack alignment. We're only calling that one function on the shadow stack so I doubt it'd result in a real issue, but might as well keep this lined up. Fixes: 31da94c25aea ("riscv: add VMAP_STACK overflow detection") Reviewed-by: Jisheng Zhang Link: https://lore.kernel.org/r/20221130023515.20217-1-palmer@rivosinc.com Signed-off-by: Palmer Dabbelt --- diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index be54ccea8c475..acdfcacd7e578 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@ -206,7 +206,7 @@ static DEFINE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], * shadow stack, handled_ kernel_ stack_ overflow(in kernel/entry.S) is used * to get per-cpu overflow stack(get_overflow_stack). */ -long shadow_stack[SHADOW_OVERFLOW_STACK_SIZE/sizeof(long)]; +long shadow_stack[SHADOW_OVERFLOW_STACK_SIZE/sizeof(long)] __aligned(16); asmlinkage unsigned long get_overflow_stack(void) { return (unsigned long)this_cpu_ptr(overflow_stack) +