diff options
| author | Palmer Dabbelt <palmer@rivosinc.com> | 2022-11-29 18:35:14 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-12-31 13:14:27 +0100 |
| commit | e8985caf05891b943980ce9899ca58782fdd60c3 (patch) | |
| tree | da8d14368e01ff9fc900b3edb37bd36c2ea4edf2 /arch/riscv/kernel | |
| parent | ca48174a7643a7e6dd31c4338c5cde49552e138e (diff) | |
RISC-V: Align the shadow stack
[ Upstream commit b003b3b77d65133a0011ae3b7b255347438c12f6 ]
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 <jszhang@kernel.org>
Link: https://lore.kernel.org/r/20221130023515.20217-1-palmer@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/riscv/kernel')
| -rw-r--r-- | arch/riscv/kernel/traps.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index 2f4cd85fb651..4102c97309cc 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@ -211,7 +211,7 @@ 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) + |