Maxim Levitsky 0f923e0712 KVM: nSVM: avoid picking up unsupported bits from L2 in int_ctl (CVE-2021-3653) ...

* 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: 3d6368ef58 ("KVM: SVM: Add VMRUN handler")
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2021-08-16 09:48:27 -04:00

..

asm

KVM: nSVM: avoid picking up unsupported bits from L2 in int_ctl (CVE-2021-3653)

2021-08-16 09:48:27 -04:00

uapi/asm

Merge tag 'x86-fpu-2021-07-07' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2021-07-07 11:12:01 -07:00