linux-hardening - [PATCH 4/4] KVM: arm64: Handle UBSAN faults

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Message-ID: <20250416180440.231949-5-smostafa@google.com>
Date: Wed, 16 Apr 2025 18:04:34 +0000
From: Mostafa Saleh <smostafa@...gle.com>
To: kvmarm@...ts.linux.dev, kasan-dev@...glegroups.com, 
	linux-hardening@...r.kernel.org, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc: will@...nel.org, maz@...nel.org, oliver.upton@...ux.dev, 
	broonie@...nel.org, catalin.marinas@....com, tglx@...utronix.de, 
	mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org, 
	hpa@...or.com, kees@...nel.org, elver@...gle.com, andreyknvl@...il.com, 
	ryabinin.a.a@...il.com, akpm@...ux-foundation.org, yuzenghui@...wei.com, 
	suzuki.poulose@....com, joey.gouly@....com, masahiroy@...nel.org, 
	nathan@...nel.org, nicolas.schier@...ux.dev, 
	Mostafa Saleh <smostafa@...gle.com>
Subject: [PATCH 4/4] KVM: arm64: Handle UBSAN faults

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@...gle.com>
---
 arch/arm64/kvm/handle_exit.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c
index b73dc26bc44b..5c49540883e3 100644
--- a/arch/arm64/kvm/handle_exit.c
+++ b/arch/arm64/kvm/handle_exit.c
@@ -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);
 	}
-- 
2.49.0.604.gff1f9ca942-goog