diff options
| author | Palmer Dabbelt | 2022-11-29 18:35:14 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2022-12-31 13:32:38 +0100 |
| commit | 652b2cdb3007be0fbfc0b9c6bab912ea81bc2b5e (patch) | |
| tree | 228178b043d9348af1275f07249775c71d99ffd7 /arch/riscv/kernel | |
| parent | ee0e9b2c4b9c35837553124b4912230a7e7c7212 (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 7abd8e4c4df6..f77cb8e42bd2 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@ -214,7 +214,7 @@ 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) + |