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arm64: Introduce esr_is_ubsan_brk()

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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 <smostafa@google.com>
Reviewed-by: Kees Cook <kees@kernel.org>
Link: https://lore.kernel.org/r/20250430162713.1997569-2-smostafa@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Mostafa Saleh
2025-04-30 16:27:08 +00:00
committed by Marc Zyngier
parent 9c32cda43e
commit dc1fd37a7f
2 changed files with 6 additions and 1 deletions
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5
arch/arm64/include/asm/esr.h
View File

@@ -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;

2
arch/arm64/kernel/traps.c
View File

@@ -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;