1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * KVM_SET_SREGS tests 4 * 5 * Copyright (C) 2018, Google LLC. 6 * 7 * This is a regression test for the bug fixed by the following commit: 8 * d3802286fa0f ("kvm: x86: Disallow illegal IA32_APIC_BASE MSR values") 9 * 10 * That bug allowed a user-mode program that called the KVM_SET_SREGS 11 * ioctl to put a VCPU's local APIC into an invalid state. 12 */ 13 #define _GNU_SOURCE /* for program_invocation_short_name */ 14 #include <fcntl.h> 15 #include <stdio.h> 16 #include <stdlib.h> 17 #include <string.h> 18 #include <sys/ioctl.h> 19 20 #include "test_util.h" 21 22 #include "kvm_util.h" 23 #include "processor.h" 24 25 #define VCPU_ID 5 26 27 int main(int argc, char *argv[]) 28 { 29 struct kvm_sregs sregs; 30 struct kvm_vm *vm; 31 int rc; 32 33 /* Tell stdout not to buffer its content */ 34 setbuf(stdout, NULL); 35 36 /* Create VM */ 37 vm = vm_create_default(VCPU_ID, 0, NULL); 38 39 vcpu_sregs_get(vm, VCPU_ID, &sregs); 40 sregs.apic_base = 1 << 10; 41 rc = _vcpu_sregs_set(vm, VCPU_ID, &sregs); 42 TEST_ASSERT(rc, "Set IA32_APIC_BASE to %llx (invalid)", 43 sregs.apic_base); 44 sregs.apic_base = 1 << 11; 45 rc = _vcpu_sregs_set(vm, VCPU_ID, &sregs); 46 TEST_ASSERT(!rc, "Couldn't set IA32_APIC_BASE to %llx (valid)", 47 sregs.apic_base); 48 49 kvm_vm_free(vm); 50 51 return 0; 52 } 53