From dc1fd37a7f501731e488c1c6f86b2f591632a4ad Mon Sep 17 00:00:00 2001 From: Mostafa Saleh Date: Wed, 30 Apr 2025 16:27:08 +0000 Subject: [PATCH] arm64: Introduce esr_is_ubsan_brk() Soon, KVM is going to use this logic for hypervisor panics, so add it in a wrapper that can be used by the hypervisor exit handler to decode hyp panics. Signed-off-by: Mostafa Saleh Reviewed-by: Kees Cook Link: https://lore.kernel.org/r/20250430162713.1997569-2-smostafa@google.com Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/esr.h | 5 +++++ arch/arm64/kernel/traps.c | 2 +- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/esr.h b/arch/arm64/include/asm/esr.h index e4f77757937e6..350f02bf437da 100644 --- a/arch/arm64/include/asm/esr.h +++ b/arch/arm64/include/asm/esr.h @@ -440,6 +440,11 @@ static inline bool esr_is_cfi_brk(unsigned long esr) (esr_brk_comment(esr) & ~CFI_BRK_IMM_MASK) == CFI_BRK_IMM_BASE; } +static inline bool esr_is_ubsan_brk(unsigned long esr) +{ + return (esr_brk_comment(esr) & ~UBSAN_BRK_MASK) == UBSAN_BRK_IMM; +} + static inline bool esr_fsc_is_translation_fault(unsigned long esr) { esr = esr & ESR_ELx_FSC; diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index 529cff825531c..224f927ac8afb 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -1145,7 +1145,7 @@ int __init early_brk64(unsigned long addr, unsigned long esr, return kasan_handler(regs, esr) != DBG_HOOK_HANDLED; #endif #ifdef CONFIG_UBSAN_TRAP - if ((esr_brk_comment(esr) & ~UBSAN_BRK_MASK) == UBSAN_BRK_IMM) + if (esr_is_ubsan_brk(esr)) return ubsan_handler(regs, esr) != DBG_HOOK_HANDLED; #endif return bug_handler(regs, esr) != DBG_HOOK_HANDLED; -- 2.47.3