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| author |   David Rientjes <rientjes@google.com> | 2019-01-02 12:56:33 -0800 |
|---|---|---|
| committer |   Radim Krčmář <rkrcmar@redhat.com> | 2019-01-11 18:38:07 +0100 |
| commit | 3f14a89d1132dcae3c8ce6721c6ef51f6e6d9b5f (patch) | |
| tree | 402821c7e8ea3a766a4d43750c8cd1d5ccb69c3d /arch | |
| parent | KVM: validate userspace input in kvm_clear_dirty_log_protect() (diff) | |
| download | linux-dev-3f14a89d1132dcae3c8ce6721c6ef51f6e6d9b5f.tar.xz linux-dev-3f14a89d1132dcae3c8ce6721c6ef51f6e6d9b5f.zip | |
kvm: sev: Fail KVM_SEV_INIT if already initialized
By code inspection, it was found that multiple calls to KVM_SEV_INIT
could deplete asid bits and overwrite kvm_sev_info's regions_list.
Multiple calls to KVM_SVM_INIT is not likely to occur with QEMU, but this
should likely be fixed anyway.
This code is serialized by kvm->lock.
Fixes: 1654efcbc431 ("KVM: SVM: Add KVM_SEV_INIT command")
Reported-by: Cfir Cohen <cfir@google.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/svm.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 307e5bddb6d9..a157ca5b6869 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -6278,6 +6278,9 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp) int asid, ret; ret = -EBUSY; + if (unlikely(sev->active)) + return ret; + asid = sev_asid_new(); if (asid < 0) return ret; |