* [PATCH] KVM: x86: check steal time address when enable steal time
@ 2021-11-05 6:37 Li RongQing
0 siblings, 0 replies; only message in thread
From: Li RongQing @ 2021-11-05 6:37 UTC (permalink / raw)
To: kvm, lirongqing
check steal time address when enable steal time, disable steal
time if guest gives a wrong address, to avoid unnecessary
write/read invalid memory
Signed-off-by: Li RongQing <lirongqing@baidu.com>
---
arch/x86/kvm/x86.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2686f2e..8c7f4f4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3440,6 +3440,9 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if (data & KVM_STEAL_RESERVED_MASK)
return 1;
+ if (!kvm_vcpu_gfn_to_memslot(vcpu, data >> PAGE_SHIFT))
+ return 1;
+
vcpu->arch.st.msr_val = data;
if (!(data & KVM_MSR_ENABLED))
--
1.7.1
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