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| author | Maxim Levitsky <mlevitsk@redhat.com> | 2021-07-15 01:56:24 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-08-18 09:59:18 +0300 |
| commit | c0883f693187c646c0972d73e525523f9486c2e3 (patch) | |
| tree | c0c5392511358add4b546429627bcc9ed85af65f /lib/stmp_device.c | |
| parent | b5f05bdfda28847305e80839477a1160ddb68b94 (diff) | |
| download | linux-c0883f693187c646c0972d73e525523f9486c2e3.tar.xz | |
KVM: nSVM: avoid picking up unsupported bits from L2 in int_ctl (CVE-2021-3653)
commit 0f923e07124df069ba68d8bb12324398f4b6b709 upstream.
* Invert the mask of bits that we pick from L2 in
nested_vmcb02_prepare_control
* Invert and explicitly use VIRQ related bits bitmask in svm_clear_vintr
This fixes a security issue that allowed a malicious L1 to run L2 with
AVIC enabled, which allowed the L2 to exploit the uninitialized and enabled
AVIC to read/write the host physical memory at some offsets.
Fixes: 3d6368ef580a ("KVM: SVM: Add VMRUN handler")
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/stmp_device.c')
0 files changed, 0 insertions, 0 deletions