32 lines
1.1 KiB
Diff
32 lines
1.1 KiB
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Maxim Levitsky <mlevitsk@redhat.com>
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Date: Tue, 21 Jun 2022 18:08:52 +0300
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Subject: [PATCH] KVM: x86: emulator: em_sysexit should update ctxt->mode
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This is one of the instructions that can change the
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processor mode.
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Note that this is likely a benign bug, because the only problematic
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mode change is from 32 bit to 64 bit which can lead to truncation of RIP,
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and it is not possible to do with sysexit,
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since sysexit running in 32 bit mode will be limited to 32 bit version.
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Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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---
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arch/x86/kvm/emulate.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
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index 318a78379ca6..35b12692739c 100644
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--- a/arch/x86/kvm/emulate.c
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+++ b/arch/x86/kvm/emulate.c
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@@ -2862,6 +2862,7 @@ static int em_sysexit(struct x86_emulate_ctxt *ctxt)
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ops->set_segment(ctxt, ss_sel, &ss, 0, VCPU_SREG_SS);
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ctxt->_eip = rdx;
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+ ctxt->mode = usermode;
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*reg_write(ctxt, VCPU_REGS_RSP) = rcx;
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return X86EMUL_CONTINUE;
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