linux-kernel - [PATCH 5.16 0792/1039] KVM: x86: Handle 32-bit wrap of EIP for EMULTYPE

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Date:   Mon, 24 Jan 2022 19:43:01 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.16 0792/1039] KVM: x86: Handle 32-bit wrap of EIP for EMULTYPE_SKIP with flat code seg

From: Sean Christopherson <seanjc@...gle.com>

[ Upstream commit 5e854864ee4384736f27a986633bae21731a4e4e ]

Truncate the new EIP to a 32-bit value when handling EMULTYPE_SKIP as the
decode phase does not truncate _eip.  Wrapping the 32-bit boundary is
legal if and only if CS is a flat code segment, but that check is
implicitly handled in the form of limit checks in the decode phase.

Opportunstically prepare for a future fix by storing the result of any
truncation in "eip" instead of "_eip".

Fixes: 1957aa63be53 ("KVM: VMX: Handle single-step #DB for EMULTYPE_SKIP on EPT misconfig")
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Message-Id: <093eabb1eab2965201c9b018373baf26ff256d85.1635842679.git.houwenlong93@...ux.alibaba.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/kvm/x86.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bb87f43cdc78c..5d5a8e75edcb7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8134,7 +8134,12 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 	 * updating interruptibility state and injecting single-step #DBs.
 	 */
 	if (emulation_type & EMULTYPE_SKIP) {
-		kvm_rip_write(vcpu, ctxt->_eip);
+		if (ctxt->mode != X86EMUL_MODE_PROT64)
+			ctxt->eip = (u32)ctxt->_eip;
+		else
+			ctxt->eip = ctxt->_eip;
+
+		kvm_rip_write(vcpu, ctxt->eip);
 		if (ctxt->eflags & X86_EFLAGS_RF)
 			kvm_set_rflags(vcpu, ctxt->eflags & ~X86_EFLAGS_RF);
 		return 1;
-- 
2.34.1