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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: 31da94c25a
("riscv: add VMAP_STACK overflow detection")
Reviewed-by: Jisheng Zhang <jszhang@kernel.org>
Link: https://lore.kernel.org/r/20221130023515.20217-1-palmer@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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@ -206,7 +206,7 @@ static DEFINE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)],
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* shadow stack, handled_ kernel_ stack_ overflow(in kernel/entry.S) is used
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* shadow stack, handled_ kernel_ stack_ overflow(in kernel/entry.S) is used
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* to get per-cpu overflow stack(get_overflow_stack).
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* to get per-cpu overflow stack(get_overflow_stack).
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*/
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*/
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long shadow_stack[SHADOW_OVERFLOW_STACK_SIZE/sizeof(long)];
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long shadow_stack[SHADOW_OVERFLOW_STACK_SIZE/sizeof(long)] __aligned(16);
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asmlinkage unsigned long get_overflow_stack(void)
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asmlinkage unsigned long get_overflow_stack(void)
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{
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{
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return (unsigned long)this_cpu_ptr(overflow_stack) +
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return (unsigned long)this_cpu_ptr(overflow_stack) +
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