linux-kernel - [PATCH 10/14] KVM: arm64: __ubsan_handle_load_invalid

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Date:   Mon, 14 Sep 2020 17:27:46 +0000
From:   George-Aurelian Popescu <georgepope@...gle.com>
To:     maz@...nel.org, catalin.marinas@....com, will@...nel.org,
        masahiroy@...nel.org, michal.lkml@...kovi.net
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        clang-built-linux@...glegroups.com, james.morse@....com,
        julien.thierry.kdev@...il.com, suzuki.poulose@....com,
        natechancellor@...il.com, ndesaulniers@...gle.com,
        dbrazdil@...gle.com, broonie@...nel.org, maskray@...gle.com,
        ascull@...gle.com, keescook@...omium.org,
        akpm@...ux-foundation.org, dvyukov@...gle.com, elver@...gle.com,
        tglx@...utronix.de, arnd@...db.de,
        George Popescu <georgepope@...gle.com>
Subject: [PATCH 10/14] KVM: arm64: __ubsan_handle_load_invalid_value hyp/nVHE implementation.

From: George Popescu <georgepope@...gle.com>

The handler for the load invalid value undefined behaviour is
implemented for hyp/nVHE. The handler's parameters are stored inside
the buffer.

They are used by the symmetric handler from the kernel.

Signed-off-by: George Popescu <georgepope@...gle.com>
---
 arch/arm64/include/asm/kvm_ubsan.h |  5 ++++-
 arch/arm64/kvm/hyp/nvhe/ubsan.c    | 14 +++++++++++++-
 arch/arm64/kvm/kvm_ubsan_buffer.c  |  4 ++++
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_ubsan.h b/arch/arm64/include/asm/kvm_ubsan.h
index 3130a80cd8b2..b643ac9a4090 100644
--- a/arch/arm64/include/asm/kvm_ubsan.h
+++ b/arch/arm64/include/asm/kvm_ubsan.h
@@ -22,12 +22,14 @@ struct kvm_ubsan_info {
 		UBSAN_NONE,
 		UBSAN_OUT_OF_BOUNDS,
 		UBSAN_UNREACHABLE_DATA,
-		UBSAN_SHIFT_OUT_OF_BOUNDS
+		UBSAN_SHIFT_OUT_OF_BOUNDS,
+		UBSAN_INVALID_DATA
 	} type;
 	union {
 		struct out_of_bounds_data out_of_bounds_data;
 		struct unreachable_data unreachable_data;
 		struct shift_out_of_bounds_data shift_out_of_bounds_data;
+		struct invalid_value_data invalid_value_data;
 	};
 	union {
 		struct ubsan_values u_val;
@@ -38,3 +40,4 @@ struct kvm_ubsan_info {
 void __ubsan_handle_out_of_bounds(void *_data, void *index);
 void __ubsan_handle_builtin_unreachable(void *_data);
 void __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs);
+void __ubsan_handle_load_invalid_value(void *_data, void *val);
diff --git a/arch/arm64/kvm/hyp/nvhe/ubsan.c b/arch/arm64/kvm/hyp/nvhe/ubsan.c
index 40b82143e57f..1888a1f51724 100644
--- a/arch/arm64/kvm/hyp/nvhe/ubsan.c
+++ b/arch/arm64/kvm/hyp/nvhe/ubsan.c
@@ -82,4 +82,16 @@ void __ubsan_handle_builtin_unreachable(void *_data)
 	}
 }
 
-void __ubsan_handle_load_invalid_value(void *_data, void *val) {}
+void __ubsan_handle_load_invalid_value(void *_data, void *val)
+{
+	struct kvm_ubsan_info *slot;
+	struct invalid_value_data *data = _data;
+
+	slot = kvm_ubsan_buffer_next_slot();
+	if (slot) {
+		slot->type = UBSAN_INVALID_DATA;
+		slot->invalid_value_data = *data;
+		slot->u_val.lval = val;
+	}
+
+}
diff --git a/arch/arm64/kvm/kvm_ubsan_buffer.c b/arch/arm64/kvm/kvm_ubsan_buffer.c
index b4a282bec91d..01bf2171af9e 100644
--- a/arch/arm64/kvm/kvm_ubsan_buffer.c
+++ b/arch/arm64/kvm/kvm_ubsan_buffer.c
@@ -32,6 +32,10 @@ void __kvm_check_ubsan_data(struct kvm_ubsan_info *slot)
 		__ubsan_handle_shift_out_of_bounds(&slot->shift_out_of_bounds_data,
 				slot->u_val.lval, slot->u_val.rval);
 		break;
+	case UBSAN_INVALID_DATA:
+		__ubsan_handle_load_invalid_value(&slot->invalid_value_data,
+				slot->u_val.lval);
+		break;
 	}
 }
 
-- 
2.28.0.618.gf4bc123cb7-goog