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Message-ID: <20240911204158.2034295-5-seanjc@google.com>
Date: Wed, 11 Sep 2024 13:41:49 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>,
Anup Patel <anup@...infault.org>, Paolo Bonzini <pbonzini@...hat.com>,
Christian Borntraeger <borntraeger@...ux.ibm.com>, Janosch Frank <frankja@...ux.ibm.com>,
Claudio Imbrenda <imbrenda@...ux.ibm.com>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org,
linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
Sean Christopherson <seanjc@...gle.com>, James Houghton <jthoughton@...gle.com>
Subject: [PATCH v2 04/13] KVM: selftests: Assert that vcpu_{g,s}et_reg() won't truncate
Assert that the the register being read/written by vcpu_{g,s}et_reg() is
no larger than a uint64_t, i.e. that a selftest isn't unintentionally
truncating the value being read/written.
Ideally, the assert would be done at compile-time, but that would limit
the checks to hardcoded accesses and/or require fancier compile-time
assertion infrastructure to filter out dynamic usage.
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
tools/testing/selftests/kvm/include/kvm_util.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index 429a7f003fe3..80230e49e35f 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -683,6 +683,8 @@ static inline uint64_t vcpu_get_reg(struct kvm_vcpu *vcpu, uint64_t id)
uint64_t val;
struct kvm_one_reg reg = { .id = id, .addr = (uint64_t)&val };
+ TEST_ASSERT(KVM_REG_SIZE(id) <= sizeof(val), "Reg %lx too big", id);
+
vcpu_ioctl(vcpu, KVM_GET_ONE_REG, ®);
return val;
}
@@ -690,6 +692,8 @@ static inline void vcpu_set_reg(struct kvm_vcpu *vcpu, uint64_t id, uint64_t val
{
struct kvm_one_reg reg = { .id = id, .addr = (uint64_t)&val };
+ TEST_ASSERT(KVM_REG_SIZE(id) <= sizeof(val), "Reg %lx too big", id);
+
vcpu_ioctl(vcpu, KVM_SET_ONE_REG, ®);
}
--
2.46.0.598.g6f2099f65c-goog
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