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KVM: x86: nSVM: harden svm_free_nested against freeing vmcb02 while still in use
authorMaxim Levitsky <mlevitsk@redhat.com>
Thu, 3 Nov 2022 14:13:44 +0000 (16:13 +0200)
committerPaolo Bonzini <pbonzini@redhat.com>
Thu, 17 Nov 2022 16:39:54 +0000 (11:39 -0500)
commit16ae56d7e0528559bf8dc9070e3bfd8ba3de80df
tree58164c77de5374af858ca156f283bebe80bd5de2tree
parent917401f26a6af5756d89b550a8e1bd50cf42b07ecommit | diff
KVM: x86: nSVM: harden svm_free_nested against freeing vmcb02 while still in use

Make sure that KVM uses vmcb01 before freeing nested state, and warn if
that is not the case.

This is a minimal fix for CVE-2022-3344 making the kernel print a warning
instead of a kernel panic.

Cc: stable@vger.kernel.org
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20221103141351.50662-3-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/svm/nested.c diff | blob | history
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