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Wed, 16 Apr 2025 11:05:23 -0700 (PDT) Date: Wed, 16 Apr 2025 18:04:33 +0000 In-Reply-To: <20250416180440.231949-1-smostafa@google.com> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250416180440.231949-1-smostafa@google.com> X-Mailer: git-send-email 2.49.0.777.g153de2bbd5-goog Message-ID: <20250416180440.231949-4-smostafa@google.com> Subject: [PATCH 3/4] KVM: arm64: Introduce CONFIG_UBSAN_KVM_EL2 From: Mostafa Saleh To: kvmarm@lists.linux.dev, kasan-dev@googlegroups.com, linux-hardening@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: will@kernel.org, maz@kernel.org, oliver.upton@linux.dev, broonie@kernel.org, catalin.marinas@arm.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, kees@kernel.org, elver@google.com, andreyknvl@gmail.com, ryabinin.a.a@gmail.com, akpm@linux-foundation.org, yuzenghui@huawei.com, suzuki.poulose@arm.com, joey.gouly@arm.com, masahiroy@kernel.org, nathan@kernel.org, nicolas.schier@linux.dev, Mostafa Saleh Content-Type: text/plain; charset="UTF-8" Add a new Kconfig CONFIG_UBSAN_KVM_EL2 for KVM which enables UBSAN for EL2 code (in protected/nvhe/hvhe) modes. This will re-use the same checks enabled for the kernel for the hypervisor. The only difference is that for EL2 it always emits a "brk" instead of implementing hooks as the hypervisor can't print reports. The KVM code will re-use the same code for the kernel "report_ubsan_failure()" so #ifdefs are changed to also have this code for CONFIG_UBSAN_KVM_EL2 Signed-off-by: Mostafa Saleh --- arch/arm64/kvm/hyp/nvhe/Makefile | 6 ++++++ include/linux/ubsan.h | 2 +- lib/Kconfig.ubsan | 9 +++++++++ lib/ubsan.c | 6 ++++-- scripts/Makefile.ubsan | 5 ++++- 5 files changed, 24 insertions(+), 4 deletions(-) diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile index b43426a493df..cbe7e12752bc 100644 --- a/arch/arm64/kvm/hyp/nvhe/Makefile +++ b/arch/arm64/kvm/hyp/nvhe/Makefile @@ -99,3 +99,9 @@ KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS), $(KBUILD_CFLAG # causes a build failure. Remove profile optimization flags. KBUILD_CFLAGS := $(filter-out -fprofile-sample-use=% -fprofile-use=%, $(KBUILD_CFLAGS)) KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -fno-unwind-tables + +ifeq ($(CONFIG_UBSAN_KVM_EL2),y) +UBSAN_SANITIZE := y +# Always use brk and not hooks +ccflags-y += $(CFLAGS_UBSAN_FOR_TRAP) +endif diff --git a/include/linux/ubsan.h b/include/linux/ubsan.h index c843816f5f68..3ab8d38aedb8 100644 --- a/include/linux/ubsan.h +++ b/include/linux/ubsan.h @@ -2,7 +2,7 @@ #ifndef _LINUX_UBSAN_H #define _LINUX_UBSAN_H -#ifdef CONFIG_UBSAN_TRAP +#if defined(CONFIG_UBSAN_TRAP) || defined(CONFIG_UBSAN_KVM_EL2) const char *report_ubsan_failure(u32 check_type); #else static inline const char *report_ubsan_failure(u32 check_type) diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan index 4216b3a4ff21..3878858eb473 100644 --- a/lib/Kconfig.ubsan +++ b/lib/Kconfig.ubsan @@ -166,4 +166,13 @@ config TEST_UBSAN This is a test module for UBSAN. It triggers various undefined behavior, and detect it. +config UBSAN_KVM_EL2 + bool "UBSAN for KVM code at EL2" + depends on ARM64 + help + Enable UBSAN when running on ARM64 with KVM in a split mode + (nvhe/hvhe/protected) for the hypervisor code running in EL2. + In this mode, any UBSAN violation in EL2 would panic the kernel + and information similar to UBSAN_TRAP would be printed. + endif # if UBSAN diff --git a/lib/ubsan.c b/lib/ubsan.c index 17993727fc96..a6ca235dd714 100644 --- a/lib/ubsan.c +++ b/lib/ubsan.c @@ -19,7 +19,7 @@ #include "ubsan.h" -#ifdef CONFIG_UBSAN_TRAP +#if defined(CONFIG_UBSAN_TRAP) || defined(CONFIG_UBSAN_KVM_EL2) /* * Only include matches for UBSAN checks that are actually compiled in. * The mappings of struct SanitizerKind (the -fsanitize=xxx args) to @@ -97,7 +97,9 @@ const char *report_ubsan_failure(u32 check_type) } } -#else +#endif + +#ifndef CONFIG_UBSAN_TRAP static const char * const type_check_kinds[] = { "load of", "store to", diff --git a/scripts/Makefile.ubsan b/scripts/Makefile.ubsan index 9e35198edbf0..68af6830af0f 100644 --- a/scripts/Makefile.ubsan +++ b/scripts/Makefile.ubsan @@ -1,5 +1,8 @@ # SPDX-License-Identifier: GPL-2.0 +#Shared with KVM/arm64 +export CFLAGS_UBSAN_FOR_TRAP := $(call cc-option,-fsanitize-trap=undefined,-fsanitize-undefined-trap-on-error) + # Enable available and selected UBSAN features. ubsan-cflags-$(CONFIG_UBSAN_ALIGNMENT) += -fsanitize=alignment ubsan-cflags-$(CONFIG_UBSAN_BOUNDS_STRICT) += -fsanitize=bounds-strict @@ -10,7 +13,7 @@ ubsan-cflags-$(CONFIG_UBSAN_DIV_ZERO) += -fsanitize=integer-divide-by-zero ubsan-cflags-$(CONFIG_UBSAN_UNREACHABLE) += -fsanitize=unreachable ubsan-cflags-$(CONFIG_UBSAN_BOOL) += -fsanitize=bool ubsan-cflags-$(CONFIG_UBSAN_ENUM) += -fsanitize=enum -ubsan-cflags-$(CONFIG_UBSAN_TRAP) += $(call cc-option,-fsanitize-trap=undefined,-fsanitize-undefined-trap-on-error) +ubsan-cflags-$(CONFIG_UBSAN_TRAP) += $(CFLAGS_UBSAN_FOR_TRAP) export CFLAGS_UBSAN := $(ubsan-cflags-y) -- 2.49.0.604.gff1f9ca942-goog