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KVM: arm64: Handle UBSAN faults

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As now UBSAN can be enabled, handle brk64 exits from UBSAN.
Re-use the decoding code from the kernel, and panic with
UBSAN message.

Signed-off-by: Mostafa Saleh <smostafa@google.com>
Reviewed-by: Kees Cook <kees@kernel.org>
Link: https://lore.kernel.org/r/20250430162713.1997569-5-smostafa@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Mostafa Saleh
2025-04-30 16:27:11 +00:00
committed by Marc Zyngier
parent 61b38f7591
commit 446692759b
1 changed files with 6 additions and 0 deletions
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6
arch/arm64/kvm/handle_exit.c
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@@ -10,6 +10,7 @@
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/ubsan.h>
#include <asm/esr.h>
#include <asm/exception.h>
@@ -474,6 +475,11 @@ void __noreturn __cold nvhe_hyp_panic_handler(u64 esr, u64 spsr,
print_nvhe_hyp_panic("BUG", panic_addr);
} else if (IS_ENABLED(CONFIG_CFI_CLANG) && esr_is_cfi_brk(esr)) {
kvm_nvhe_report_cfi_failure(panic_addr);
} else if (IS_ENABLED(CONFIG_UBSAN_KVM_EL2) &&
ESR_ELx_EC(esr) == ESR_ELx_EC_BRK64 &&
esr_is_ubsan_brk(esr)) {
print_nvhe_hyp_panic(report_ubsan_failure(esr & UBSAN_BRK_MASK),
panic_addr);
} else {
print_nvhe_hyp_panic("panic", panic_addr);
}