Messages in this thread Patch in this message | | | From | Mark Brown <> | Subject | [PATCH v9 09/13] arm64: BTI: Reset BTYPE when skipping emulated instructions | Date | Wed, 11 Mar 2020 19:26:04 +0000 |
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From: Dave Martin <Dave.Martin@arm.com>
Since normal execution of any non-branch instruction resets the PSTATE BTYPE field to 0, so do the same thing when emulating a trapped instruction.
Branches don't trap directly, so we should never need to assign a non-zero value to BTYPE here.
Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Mark Brown <broonie@kernel.org> --- arch/arm64/kernel/traps.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index 3c07a7074145..52ed261e7739 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -335,6 +335,8 @@ void arm64_skip_faulting_instruction(struct pt_regs *regs, unsigned long size) if (compat_user_mode(regs)) advance_itstate(regs); + else + regs->pstate &= ~PSR_BTYPE_MASK; } static LIST_HEAD(undef_hook); -- 2.20.1
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