diff options
Diffstat (limited to 'KVM-svm-unconditionally-intercept-DB.patch')
| -rw-r--r-- | KVM-svm-unconditionally-intercept-DB.patch | 80 |
1 files changed, 0 insertions, 80 deletions
diff --git a/KVM-svm-unconditionally-intercept-DB.patch b/KVM-svm-unconditionally-intercept-DB.patch deleted file mode 100644 index 021af4ccb..000000000 --- a/KVM-svm-unconditionally-intercept-DB.patch +++ /dev/null @@ -1,80 +0,0 @@ -From 48bb9bb210c6c2f185d891e3e7a401d849409f84 Mon Sep 17 00:00:00 2001 -From: Paolo Bonzini <pbonzini@redhat.com> -Date: Tue, 10 Nov 2015 13:22:53 +0100 -Subject: [PATCH 2/2] KVM: svm: unconditionally intercept #DB - -This is needed to avoid the possibility that the guest triggers -an infinite stream of #DB exceptions (CVE-2015-8104). - -VMX is not affected: because it does not save DR6 in the VMCS, -it already intercepts #DB unconditionally. - -Reported-by: Jan Beulich <jbeulich@suse.com> -Cc: stable@vger.kernel.org -Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> ---- - arch/x86/kvm/svm.c | 14 +++----------- - 1 file changed, 3 insertions(+), 11 deletions(-) - -diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c -index 7203b3cc71b5..184e50b3c35a 100644 ---- a/arch/x86/kvm/svm.c -+++ b/arch/x86/kvm/svm.c -@@ -1111,6 +1111,7 @@ static void init_vmcb(struct vcpu_svm *svm) - set_exception_intercept(svm, UD_VECTOR); - set_exception_intercept(svm, MC_VECTOR); - set_exception_intercept(svm, AC_VECTOR); -+ set_exception_intercept(svm, DB_VECTOR); - - set_intercept(svm, INTERCEPT_INTR); - set_intercept(svm, INTERCEPT_NMI); -@@ -1645,20 +1646,13 @@ static void svm_set_segment(struct kvm_vcpu *vcpu, - mark_dirty(svm->vmcb, VMCB_SEG); - } - --static void update_db_bp_intercept(struct kvm_vcpu *vcpu) -+static void update_bp_intercept(struct kvm_vcpu *vcpu) - { - struct vcpu_svm *svm = to_svm(vcpu); - -- clr_exception_intercept(svm, DB_VECTOR); - clr_exception_intercept(svm, BP_VECTOR); - -- if (svm->nmi_singlestep) -- set_exception_intercept(svm, DB_VECTOR); -- - if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) { -- if (vcpu->guest_debug & -- (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) -- set_exception_intercept(svm, DB_VECTOR); - if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) - set_exception_intercept(svm, BP_VECTOR); - } else -@@ -1764,7 +1758,6 @@ static int db_interception(struct vcpu_svm *svm) - if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP)) - svm->vmcb->save.rflags &= - ~(X86_EFLAGS_TF | X86_EFLAGS_RF); -- update_db_bp_intercept(&svm->vcpu); - } - - if (svm->vcpu.guest_debug & -@@ -3753,7 +3746,6 @@ static void enable_nmi_window(struct kvm_vcpu *vcpu) - */ - svm->nmi_singlestep = true; - svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF); -- update_db_bp_intercept(vcpu); - } - - static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr) -@@ -4379,7 +4371,7 @@ static struct kvm_x86_ops svm_x86_ops = { - .vcpu_load = svm_vcpu_load, - .vcpu_put = svm_vcpu_put, - -- .update_db_bp_intercept = update_db_bp_intercept, -+ .update_db_bp_intercept = update_bp_intercept, - .get_msr = svm_get_msr, - .set_msr = svm_set_msr, - .get_segment_base = svm_get_segment_base, --- -2.4.3 - |