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| author | Maxim Levitsky <mlevitsk@redhat.com> | 2021-08-16 16:02:31 +0200 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2021-08-26 08:37:48 -0400 |
| commit | 53723b7be26ef31ad642ce5ffa8b42dec16db40e (patch) | |
| tree | f02e345797b7ac571d2b1ae153cffeb52cfeb934 /drivers/misc/ibmasm/command.c | |
| parent | f1c2379db980d52f181d30321b2eb395e3a91858 (diff) | |
KVM: nSVM: avoid picking up unsupported bits from L2 in int_ctl (CVE-2021-3653)
[ upstream commit 0f923e07124df069ba68d8bb12324398f4b6b709 ]
* 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 'drivers/misc/ibmasm/command.c')
0 files changed, 0 insertions, 0 deletions