linux-kernel - [PATCH v3 4/8] nSVM: use vmcb_save_area_cached in nested_vmcb_valid

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20211011143702.1786568-5-eesposit@redhat.com>
Date:   Mon, 11 Oct 2021 10:36:58 -0400
From:   Emanuele Giuseppe Esposito <eesposit@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        linux-kernel@...r.kernel.org,
        Emanuele Giuseppe Esposito <eesposit@...hat.com>
Subject: [PATCH v3 4/8] nSVM: use vmcb_save_area_cached in nested_vmcb_valid_sregs()

Now that struct vmcb_save_area_cached contains the required
vmcb fields values (done in nested_load_save_from_vmcb12()),
check them to see if they are correct in nested_vmcb_valid_sregs().

Since we are always checking for the nested struct, it is enough
to have only the vcpu as parameter.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@...hat.com>
---
 arch/x86/kvm/svm/nested.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index f6030a202bc5..d07cd4b88acd 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -230,9 +230,10 @@ static bool nested_vmcb_check_controls(struct kvm_vcpu *vcpu,
 }
 
 /* Common checks that apply to both L1 and L2 state.  */
-static bool nested_vmcb_valid_sregs(struct kvm_vcpu *vcpu,
-				    struct vmcb_save_area *save)
+static bool nested_vmcb_valid_sregs(struct kvm_vcpu *vcpu)
 {
+	struct vcpu_svm *svm = to_svm(vcpu);
+	struct vmcb_save_area_cached *save = &svm->nested.save;
 	/*
 	 * FIXME: these should be done after copying the fields,
 	 * to avoid TOC/TOU races.  For these save area checks
@@ -658,7 +659,7 @@ int nested_svm_vmrun(struct kvm_vcpu *vcpu)
 	nested_copy_vmcb_control_to_cache(svm, &vmcb12->control);
 	nested_copy_vmcb_save_to_cache(svm, &vmcb12->save);
 
-	if (!nested_vmcb_valid_sregs(vcpu, &vmcb12->save) ||
+	if (!nested_vmcb_valid_sregs(vcpu) ||
 	    !nested_vmcb_check_controls(vcpu, &svm->nested.ctl)) {
 		vmcb12->control.exit_code    = SVM_EXIT_ERR;
 		vmcb12->control.exit_code_hi = 0;
@@ -1355,11 +1356,12 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
 	 * Validate host state saved from before VMRUN (see
 	 * nested_svm_check_permissions).
 	 */
+	nested_copy_vmcb_save_to_cache(svm, save);
 	if (!(save->cr0 & X86_CR0_PG) ||
 	    !(save->cr0 & X86_CR0_PE) ||
 	    (save->rflags & X86_EFLAGS_VM) ||
-	    !nested_vmcb_valid_sregs(vcpu, save))
-		goto out_free;
+	    !nested_vmcb_valid_sregs(vcpu))
+		goto out_free_save;
 
 	/*
 	 * While the nested guest CR3 is already checked and set by
@@ -1371,7 +1373,7 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
 	ret = nested_svm_load_cr3(&svm->vcpu, vcpu->arch.cr3,
 				  nested_npt_enabled(svm), false);
 	if (WARN_ON_ONCE(ret))
-		goto out_free;
+		goto out_free_save;
 
 
 	/*
@@ -1395,12 +1397,15 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
 
 	svm_copy_vmrun_state(&svm->vmcb01.ptr->save, save);
 	nested_copy_vmcb_control_to_cache(svm, ctl);
-	nested_copy_vmcb_save_to_cache(svm, save);
 
 	svm_switch_vmcb(svm, &svm->nested.vmcb02);
 	nested_vmcb02_prepare_control(svm);
 	kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
 	ret = 0;
+
+out_free_save:
+	memset(&svm->nested.save, 0, sizeof(struct vmcb_save_area_cached));
+
 out_free:
 	kfree(save);
 	kfree(ctl);
-- 
2.27.0