[v2,6/9] kvm: selftests: add svm nested shutdown test

Message ID 20221103141351.50662-7-mlevitsk@redhat.com
State New
Headers
Series nSVM: Security and correctness fixes |

Commit Message

Maxim Levitsky Nov. 3, 2022, 2:13 p.m. UTC
  Add test that tests that on SVM if L1 doesn't intercept SHUTDOWN,
then L2 crashes L1 and doesn't crash L2

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
 tools/testing/selftests/kvm/.gitignore        |  1 +
 tools/testing/selftests/kvm/Makefile          |  1 +
 .../kvm/x86_64/svm_nested_shutdown_test.c     | 67 +++++++++++++++++++
 3 files changed, 69 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c
  

Comments

Maxim Levitsky Nov. 3, 2022, 2:28 p.m. UTC | #1
On Thu, 2022-11-03 at 16:13 +0200, Maxim Levitsky wrote:
> Add test that tests that on SVM if L1 doesn't intercept SHUTDOWN,
> then L2 crashes L1 and doesn't crash L2
I mean doesn't crash L0, sorry for typo.

Best regards,
	Maxim Levitsky
> 
> Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
> ---
>  tools/testing/selftests/kvm/.gitignore        |  1 +
>  tools/testing/selftests/kvm/Makefile          |  1 +
>  .../kvm/x86_64/svm_nested_shutdown_test.c     | 67 +++++++++++++++++++
>  3 files changed, 69 insertions(+)
>  create mode 100644 tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c
> 
> diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
> index 2f0d705db9dba5..05d980fb083d17 100644
> --- a/tools/testing/selftests/kvm/.gitignore
> +++ b/tools/testing/selftests/kvm/.gitignore
> @@ -41,6 +41,7 @@
>  /x86_64/svm_vmcall_test
>  /x86_64/svm_int_ctl_test
>  /x86_64/svm_nested_soft_inject_test
> +/x86_64/svm_nested_shutdown_test
>  /x86_64/sync_regs_test
>  /x86_64/tsc_msrs_test
>  /x86_64/tsc_scaling_sync
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index 0172eb6cb6eee2..4a2caef2c9396f 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -101,6 +101,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/state_test
>  TEST_GEN_PROGS_x86_64 += x86_64/vmx_preemption_timer_test
>  TEST_GEN_PROGS_x86_64 += x86_64/svm_vmcall_test
>  TEST_GEN_PROGS_x86_64 += x86_64/svm_int_ctl_test
> +TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_shutdown_test
>  TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_soft_inject_test
>  TEST_GEN_PROGS_x86_64 += x86_64/tsc_scaling_sync
>  TEST_GEN_PROGS_x86_64 += x86_64/sync_regs_test
> diff --git a/tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c b/tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c
> new file mode 100644
> index 00000000000000..e73fcdef47bbe9
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c
> @@ -0,0 +1,67 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * svm_nested_shutdown_test
> + *
> + * Copyright (C) 2022, Red Hat, Inc.
> + *
> + * Nested SVM testing: test that unintercepted shutdown in L2 doesn't crash the host
> + */
> +
> +#include "test_util.h"
> +#include "kvm_util.h"
> +#include "processor.h"
> +#include "svm_util.h"
> +
> +static void l2_guest_code(struct svm_test_data *svm)
> +{
> +       __asm__ __volatile__("ud2");
> +}
> +
> +static void l1_guest_code(struct svm_test_data *svm, struct idt_entry *idt)
> +{
> +       #define L2_GUEST_STACK_SIZE 64
> +       unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
> +       struct vmcb *vmcb = svm->vmcb;
> +
> +       generic_svm_setup(svm, l2_guest_code,
> +                         &l2_guest_stack[L2_GUEST_STACK_SIZE]);
> +
> +       vmcb->control.intercept &= ~(BIT(INTERCEPT_SHUTDOWN));
> +
> +       idt[6].p   = 0; // #UD is intercepted but its injection will cause #NP
> +       idt[11].p  = 0; // #NP is not intercepted and will cause another
> +                       // #NP that will be converted to #DF
> +       idt[8].p   = 0; // #DF will cause #NP which will cause SHUTDOWN
> +
> +       run_guest(vmcb, svm->vmcb_gpa);
> +
> +       /* should not reach here */
> +       GUEST_ASSERT(0);
> +}
> +
> +int main(int argc, char *argv[])
> +{
> +       struct kvm_vcpu *vcpu;
> +       struct kvm_run *run;
> +       vm_vaddr_t svm_gva;
> +       struct kvm_vm *vm;
> +
> +       TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
> +
> +       vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
> +       vm_init_descriptor_tables(vm);
> +       vcpu_init_descriptor_tables(vcpu);
> +
> +       vcpu_alloc_svm(vm, &svm_gva);
> +
> +       vcpu_args_set(vcpu, 2, svm_gva, vm->idt);
> +       run = vcpu->run;
> +
> +       vcpu_run(vcpu);
> +       TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN,
> +                   "Got exit_reason other than KVM_EXIT_SHUTDOWN: %u (%s)\n",
> +                   run->exit_reason,
> +                   exit_reason_str(run->exit_reason));
> +
> +       kvm_vm_free(vm);
> +}
  
Liam Merwick Nov. 21, 2022, 4:33 p.m. UTC | #2
On 03/11/2022 14:28, Maxim Levitsky wrote:
> On Thu, 2022-11-03 at 16:13 +0200, Maxim Levitsky wrote:
>> Add test that tests that on SVM if L1 doesn't intercept SHUTDOWN,
>> then L2 crashes L1 and doesn't crash L2
> I mean doesn't crash L0, sorry for typo.
> 
> Best regards,
> 	Maxim Levitsky
>>
>> Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>


Reviewed-by: Liam Merwick <liam.merwick@oracle.com>


>> ---
>>   tools/testing/selftests/kvm/.gitignore        |  1 +
>>   tools/testing/selftests/kvm/Makefile          |  1 +
>>   .../kvm/x86_64/svm_nested_shutdown_test.c     | 67 +++++++++++++++++++
>>   3 files changed, 69 insertions(+)
>>   create mode 100644 tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c
>>
>> diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
>> index 2f0d705db9dba5..05d980fb083d17 100644
>> --- a/tools/testing/selftests/kvm/.gitignore
>> +++ b/tools/testing/selftests/kvm/.gitignore
>> @@ -41,6 +41,7 @@
>>   /x86_64/svm_vmcall_test
>>   /x86_64/svm_int_ctl_test
>>   /x86_64/svm_nested_soft_inject_test
>> +/x86_64/svm_nested_shutdown_test
>>   /x86_64/sync_regs_test
>>   /x86_64/tsc_msrs_test
>>   /x86_64/tsc_scaling_sync
>> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
>> index 0172eb6cb6eee2..4a2caef2c9396f 100644
>> --- a/tools/testing/selftests/kvm/Makefile
>> +++ b/tools/testing/selftests/kvm/Makefile
>> @@ -101,6 +101,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/state_test
>>   TEST_GEN_PROGS_x86_64 += x86_64/vmx_preemption_timer_test
>>   TEST_GEN_PROGS_x86_64 += x86_64/svm_vmcall_test
>>   TEST_GEN_PROGS_x86_64 += x86_64/svm_int_ctl_test
>> +TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_shutdown_test
>>   TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_soft_inject_test
>>   TEST_GEN_PROGS_x86_64 += x86_64/tsc_scaling_sync
>>   TEST_GEN_PROGS_x86_64 += x86_64/sync_regs_test
>> diff --git a/tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c b/tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c
>> new file mode 100644
>> index 00000000000000..e73fcdef47bbe9
>> --- /dev/null
>> +++ b/tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c
>> @@ -0,0 +1,67 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * svm_nested_shutdown_test
>> + *
>> + * Copyright (C) 2022, Red Hat, Inc.
>> + *
>> + * Nested SVM testing: test that unintercepted shutdown in L2 doesn't crash the host
>> + */
>> +
>> +#include "test_util.h"
>> +#include "kvm_util.h"
>> +#include "processor.h"
>> +#include "svm_util.h"
>> +
>> +static void l2_guest_code(struct svm_test_data *svm)
>> +{
>> +       __asm__ __volatile__("ud2");
>> +}
>> +
>> +static void l1_guest_code(struct svm_test_data *svm, struct idt_entry *idt)
>> +{
>> +       #define L2_GUEST_STACK_SIZE 64
>> +       unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
>> +       struct vmcb *vmcb = svm->vmcb;
>> +
>> +       generic_svm_setup(svm, l2_guest_code,
>> +                         &l2_guest_stack[L2_GUEST_STACK_SIZE]);
>> +
>> +       vmcb->control.intercept &= ~(BIT(INTERCEPT_SHUTDOWN));
>> +
>> +       idt[6].p   = 0; // #UD is intercepted but its injection will cause #NP
>> +       idt[11].p  = 0; // #NP is not intercepted and will cause another
>> +                       // #NP that will be converted to #DF
>> +       idt[8].p   = 0; // #DF will cause #NP which will cause SHUTDOWN
>> +
>> +       run_guest(vmcb, svm->vmcb_gpa);
>> +
>> +       /* should not reach here */
>> +       GUEST_ASSERT(0);
>> +}
>> +
>> +int main(int argc, char *argv[])
>> +{
>> +       struct kvm_vcpu *vcpu;
>> +       struct kvm_run *run;
>> +       vm_vaddr_t svm_gva;
>> +       struct kvm_vm *vm;
>> +
>> +       TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
>> +
>> +       vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
>> +       vm_init_descriptor_tables(vm);
>> +       vcpu_init_descriptor_tables(vcpu);
>> +
>> +       vcpu_alloc_svm(vm, &svm_gva);
>> +
>> +       vcpu_args_set(vcpu, 2, svm_gva, vm->idt);
>> +       run = vcpu->run;
>> +
>> +       vcpu_run(vcpu);
>> +       TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN,
>> +                   "Got exit_reason other than KVM_EXIT_SHUTDOWN: %u (%s)\n",
>> +                   run->exit_reason,
>> +                   exit_reason_str(run->exit_reason));
>> +
>> +       kvm_vm_free(vm);
>> +}
> 
>
  

Patch

diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore
index 2f0d705db9dba5..05d980fb083d17 100644
--- a/tools/testing/selftests/kvm/.gitignore
+++ b/tools/testing/selftests/kvm/.gitignore
@@ -41,6 +41,7 @@ 
 /x86_64/svm_vmcall_test
 /x86_64/svm_int_ctl_test
 /x86_64/svm_nested_soft_inject_test
+/x86_64/svm_nested_shutdown_test
 /x86_64/sync_regs_test
 /x86_64/tsc_msrs_test
 /x86_64/tsc_scaling_sync
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index 0172eb6cb6eee2..4a2caef2c9396f 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -101,6 +101,7 @@  TEST_GEN_PROGS_x86_64 += x86_64/state_test
 TEST_GEN_PROGS_x86_64 += x86_64/vmx_preemption_timer_test
 TEST_GEN_PROGS_x86_64 += x86_64/svm_vmcall_test
 TEST_GEN_PROGS_x86_64 += x86_64/svm_int_ctl_test
+TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_shutdown_test
 TEST_GEN_PROGS_x86_64 += x86_64/svm_nested_soft_inject_test
 TEST_GEN_PROGS_x86_64 += x86_64/tsc_scaling_sync
 TEST_GEN_PROGS_x86_64 += x86_64/sync_regs_test
diff --git a/tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c b/tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c
new file mode 100644
index 00000000000000..e73fcdef47bbe9
--- /dev/null
+++ b/tools/testing/selftests/kvm/x86_64/svm_nested_shutdown_test.c
@@ -0,0 +1,67 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * svm_nested_shutdown_test
+ *
+ * Copyright (C) 2022, Red Hat, Inc.
+ *
+ * Nested SVM testing: test that unintercepted shutdown in L2 doesn't crash the host
+ */
+
+#include "test_util.h"
+#include "kvm_util.h"
+#include "processor.h"
+#include "svm_util.h"
+
+static void l2_guest_code(struct svm_test_data *svm)
+{
+	__asm__ __volatile__("ud2");
+}
+
+static void l1_guest_code(struct svm_test_data *svm, struct idt_entry *idt)
+{
+	#define L2_GUEST_STACK_SIZE 64
+	unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
+	struct vmcb *vmcb = svm->vmcb;
+
+	generic_svm_setup(svm, l2_guest_code,
+			  &l2_guest_stack[L2_GUEST_STACK_SIZE]);
+
+	vmcb->control.intercept &= ~(BIT(INTERCEPT_SHUTDOWN));
+
+	idt[6].p   = 0; // #UD is intercepted but its injection will cause #NP
+	idt[11].p  = 0; // #NP is not intercepted and will cause another
+			// #NP that will be converted to #DF
+	idt[8].p   = 0; // #DF will cause #NP which will cause SHUTDOWN
+
+	run_guest(vmcb, svm->vmcb_gpa);
+
+	/* should not reach here */
+	GUEST_ASSERT(0);
+}
+
+int main(int argc, char *argv[])
+{
+	struct kvm_vcpu *vcpu;
+	struct kvm_run *run;
+	vm_vaddr_t svm_gva;
+	struct kvm_vm *vm;
+
+	TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_SVM));
+
+	vm = vm_create_with_one_vcpu(&vcpu, l1_guest_code);
+	vm_init_descriptor_tables(vm);
+	vcpu_init_descriptor_tables(vcpu);
+
+	vcpu_alloc_svm(vm, &svm_gva);
+
+	vcpu_args_set(vcpu, 2, svm_gva, vm->idt);
+	run = vcpu->run;
+
+	vcpu_run(vcpu);
+	TEST_ASSERT(run->exit_reason == KVM_EXIT_SHUTDOWN,
+		    "Got exit_reason other than KVM_EXIT_SHUTDOWN: %u (%s)\n",
+		    run->exit_reason,
+		    exit_reason_str(run->exit_reason));
+
+	kvm_vm_free(vm);
+}