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KVM: selftests: Sanity check input to ioctls() at build time

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Add a static assert to the KVM/VM/vCPU ioctl() helpers to verify that the
size of the argument provided matches the expected size of the IOCTL.
Because ioctl() ultimately takes a "void *", it's all too easy to pass in
garbage and not detect the error until runtime.  E.g. while working on a
CPUID rework, selftests happily compiled when vcpu_set_cpuid()
unintentionally passed the cpuid() function as the parameter to ioctl()
(a local "cpuid" parameter was removed, but its use was not replaced with
"vcpu->cpuid" as intended).

Tweak a variety of benign issues that aren't compatible with the sanity
check, e.g. passing a non-pointer for ioctls().

Note, static_assert() requires a string on older versions of GCC.  Feed
it an empty string to make the compiler happy.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-06-01 11:01:58 -07:00 committed by Paolo Bonzini
parent 5321270b23
commit fcba483e82
9 changed files with 58 additions and 56 deletions
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59
tools/testing/selftests/kvm/include/kvm_util_base.h
View file

@ -180,29 +180,56 @@ static inline bool kvm_has_cap(long cap)
#define __KVM_IOCTL_ERROR(_name, _ret) __KVM_SYSCALL_ERROR(_name, _ret)
#define KVM_IOCTL_ERROR(_ioctl, _ret) __KVM_IOCTL_ERROR(#_ioctl, _ret)
#define __kvm_ioctl(kvm_fd, cmd, arg) \
ioctl(kvm_fd, cmd, arg)
#define kvm_do_ioctl(fd, cmd, arg) \
({ \
static_assert(!_IOC_SIZE(cmd) || sizeof(*arg) == _IOC_SIZE(cmd), ""); \
ioctl(fd, cmd, arg); \
})
static inline void _kvm_ioctl(int kvm_fd, unsigned long cmd, const char *name,
void *arg)
{
int ret = __kvm_ioctl(kvm_fd, cmd, arg);
#define __kvm_ioctl(kvm_fd, cmd, arg) \
kvm_do_ioctl(kvm_fd, cmd, arg)
TEST_ASSERT(!ret, __KVM_IOCTL_ERROR(name, ret));
}
#define _kvm_ioctl(kvm_fd, cmd, name, arg) \
({ \
int ret = __kvm_ioctl(kvm_fd, cmd, arg); \
\
TEST_ASSERT(!ret, __KVM_IOCTL_ERROR(name, ret)); \
})
#define kvm_ioctl(kvm_fd, cmd, arg) \
_kvm_ioctl(kvm_fd, cmd, #cmd, arg)
int __vm_ioctl(struct kvm_vm *vm, unsigned long cmd, void *arg);
void _vm_ioctl(struct kvm_vm *vm, unsigned long cmd, const char *name, void *arg);
#define vm_ioctl(vm, cmd, arg) _vm_ioctl(vm, cmd, #cmd, arg)
#define __vm_ioctl(vm, cmd, arg) \
({ \
static_assert(sizeof(*(vm)) == sizeof(struct kvm_vm), ""); \
kvm_do_ioctl((vm)->fd, cmd, arg); \
})
int __vcpu_ioctl(struct kvm_vcpu *vcpu, unsigned long cmd,
void *arg);
void _vcpu_ioctl(struct kvm_vcpu *vcpu, unsigned long cmd,
const char *name, void *arg);
#define vcpu_ioctl(vcpu, cmd, arg) \
#define _vm_ioctl(vm, cmd, name, arg) \
({ \
int ret = __vm_ioctl(vm, cmd, arg); \
\
TEST_ASSERT(!ret, __KVM_IOCTL_ERROR(name, ret)); \
})
#define vm_ioctl(vm, cmd, arg) \
_vm_ioctl(vm, cmd, #cmd, arg)
#define __vcpu_ioctl(vcpu, cmd, arg) \
({ \
static_assert(sizeof(*(vcpu)) == sizeof(struct kvm_vcpu), ""); \
kvm_do_ioctl((vcpu)->fd, cmd, arg); \
})
#define _vcpu_ioctl(vcpu, cmd, name, arg) \
({ \
int ret = __vcpu_ioctl(vcpu, cmd, arg); \
\
TEST_ASSERT(!ret, __KVM_IOCTL_ERROR(name, ret)); \
})
#define vcpu_ioctl(vcpu, cmd, arg) \
_vcpu_ioctl(vcpu, cmd, #cmd, arg)
/*

2
tools/testing/selftests/kvm/lib/aarch64/processor.c
View file

@ -472,7 +472,7 @@ void aarch64_get_supported_page_sizes(uint32_t ipa,
};
kvm_fd = open_kvm_dev_path_or_exit();
vm_fd = __kvm_ioctl(kvm_fd, KVM_CREATE_VM, ipa);
vm_fd = __kvm_ioctl(kvm_fd, KVM_CREATE_VM, (void *)(unsigned long)ipa);
TEST_ASSERT(vm_fd >= 0, KVM_IOCTL_ERROR(KVM_CREATE_VM, vm_fd));
vcpu_fd = ioctl(vm_fd, KVM_CREATE_VCPU, 0);

2
tools/testing/selftests/kvm/lib/guest_modes.c
View file

@ -65,7 +65,7 @@ void guest_modes_append_default(void)
struct kvm_s390_vm_cpu_processor info;
kvm_fd = open_kvm_dev_path_or_exit();
vm_fd = __kvm_ioctl(kvm_fd, KVM_CREATE_VM, 0);
vm_fd = __kvm_ioctl(kvm_fd, KVM_CREATE_VM, NULL);
kvm_device_attr_get(vm_fd, KVM_S390_VM_CPU_MODEL,
KVM_S390_VM_CPU_PROCESSOR, &info);
close(vm_fd);

29
tools/testing/selftests/kvm/lib/kvm_util.c
View file

@ -72,7 +72,7 @@ unsigned int kvm_check_cap(long cap)
int kvm_fd;
kvm_fd = open_kvm_dev_path_or_exit();
ret = __kvm_ioctl(kvm_fd, KVM_CHECK_EXTENSION, cap);
ret = __kvm_ioctl(kvm_fd, KVM_CHECK_EXTENSION, (void *)cap);
TEST_ASSERT(ret >= 0, KVM_IOCTL_ERROR(KVM_CHECK_EXTENSION, ret));
close(kvm_fd);
@ -92,7 +92,7 @@ static void vm_open(struct kvm_vm *vm)
TEST_REQUIRE(kvm_has_cap(KVM_CAP_IMMEDIATE_EXIT));
vm->fd = __kvm_ioctl(vm->kvm_fd, KVM_CREATE_VM, vm->type);
vm->fd = __kvm_ioctl(vm->kvm_fd, KVM_CREATE_VM, (void *)vm->type);
TEST_ASSERT(vm->fd >= 0, KVM_IOCTL_ERROR(KVM_CREATE_VM, vm->fd));
}
@ -1450,19 +1450,6 @@ struct kvm_reg_list *vcpu_get_reg_list(struct kvm_vcpu *vcpu)
return reg_list;
}
int __vcpu_ioctl(struct kvm_vcpu *vcpu, unsigned long cmd, void *arg)
{
return ioctl(vcpu->fd, cmd, arg);
}
void _vcpu_ioctl(struct kvm_vcpu *vcpu, unsigned long cmd, const char *name,
void *arg)
{
int ret = __vcpu_ioctl(vcpu, cmd, arg);
TEST_ASSERT(!ret, __KVM_IOCTL_ERROR(name, ret));
}
void *vcpu_map_dirty_ring(struct kvm_vcpu *vcpu)
{
uint32_t page_size = vcpu->vm->page_size;
@ -1492,18 +1479,6 @@ void *vcpu_map_dirty_ring(struct kvm_vcpu *vcpu)
return vcpu->dirty_gfns;
}
int __vm_ioctl(struct kvm_vm *vm, unsigned long cmd, void *arg)
{
return ioctl(vm->fd, cmd, arg);
}
void _vm_ioctl(struct kvm_vm *vm, unsigned long cmd, const char *name, void *arg)
{
int ret = __vm_ioctl(vm, cmd, arg);
TEST_ASSERT(!ret, __KVM_IOCTL_ERROR(name, ret));
}
/*
* Device Ioctl
*/

6
tools/testing/selftests/kvm/lib/x86_64/perf_test_util.c
View file

@ -103,9 +103,9 @@ void perf_test_setup_nested(struct kvm_vm *vm, int nr_vcpus, struct kvm_vcpu *vc
* Override the vCPU to run perf_test_l1_guest_code() which will
* bounce it into L2 before calling perf_test_guest_code().
*/
vcpu_regs_get(vm, vcpus[vcpu_id]->id, &regs);
vcpu_regs_get(vcpus[vcpu_id], &regs);
regs.rip = (unsigned long) perf_test_l1_guest_code;
vcpu_regs_set(vm, vcpus[vcpu_id]->id, &regs);
vcpu_args_set(vm, vcpus[vcpu_id]->id, 2, vmx_gva, vcpu_id);
vcpu_regs_set(vcpus[vcpu_id], &regs);
vcpu_args_set(vcpus[vcpu_id], 2, vmx_gva, vcpu_id);
}
}

6
tools/testing/selftests/kvm/s390x/resets.c
View file

@ -225,7 +225,7 @@ static void test_normal(void)
inject_irq(vcpu);
vcpu_ioctl(vcpu, KVM_S390_NORMAL_RESET, 0);
vcpu_ioctl(vcpu, KVM_S390_NORMAL_RESET, NULL);
/* must clears */
assert_normal(vcpu);
@ -248,7 +248,7 @@ static void test_initial(void)
inject_irq(vcpu);
vcpu_ioctl(vcpu, KVM_S390_INITIAL_RESET, 0);
vcpu_ioctl(vcpu, KVM_S390_INITIAL_RESET, NULL);
/* must clears */
assert_normal(vcpu);
@ -271,7 +271,7 @@ static void test_clear(void)
inject_irq(vcpu);
vcpu_ioctl(vcpu, KVM_S390_CLEAR_RESET, 0);
vcpu_ioctl(vcpu, KVM_S390_CLEAR_RESET, NULL);
/* must clears */
assert_normal(vcpu);

2
tools/testing/selftests/kvm/x86_64/mmio_warning_test.c
View file

@ -59,7 +59,7 @@ void test(void)
kvm = open("/dev/kvm", O_RDWR);
TEST_ASSERT(kvm != -1, "failed to open /dev/kvm");
kvmvm = __kvm_ioctl(kvm, KVM_CREATE_VM, 0);
kvmvm = __kvm_ioctl(kvm, KVM_CREATE_VM, NULL);
TEST_ASSERT(kvmvm > 0, KVM_IOCTL_ERROR(KVM_CREATE_VM, kvmvm));
kvmcpu = ioctl(kvmvm, KVM_CREATE_VCPU, 0);
TEST_ASSERT(kvmcpu != -1, KVM_IOCTL_ERROR(KVM_CREATE_VCPU, kvmcpu));

2
tools/testing/selftests/kvm/x86_64/pmu_event_filter_test.c
View file

@ -276,7 +276,7 @@ static void test_without_filter(struct kvm_vcpu *vcpu)
static uint64_t test_with_filter(struct kvm_vcpu *vcpu,
struct kvm_pmu_event_filter *f)
{
vm_ioctl(vcpu->vm, KVM_SET_PMU_EVENT_FILTER, (void *)f);
vm_ioctl(vcpu->vm, KVM_SET_PMU_EVENT_FILTER, f);
return run_vcpu_to_sync(vcpu);
}

6
tools/testing/selftests/kvm/x86_64/xen_shinfo_test.c
View file

@ -472,7 +472,7 @@ int main(int argc, char *argv[])
irq_routes.entries[1].u.xen_evtchn.vcpu = vcpu->id;
irq_routes.entries[1].u.xen_evtchn.priority = KVM_IRQ_ROUTING_XEN_EVTCHN_PRIO_2LEVEL;
vm_ioctl(vm, KVM_SET_GSI_ROUTING, &irq_routes);
vm_ioctl(vm, KVM_SET_GSI_ROUTING, &irq_routes.info);
struct kvm_irqfd ifd = { };
@ -716,7 +716,7 @@ int main(int argc, char *argv[])
if (verbose)
printf("Testing restored oneshot timer\n");
tmr.u.timer.expires_ns = rs->state_entry_time + 100000000,
tmr.u.timer.expires_ns = rs->state_entry_time + 100000000;
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr);
evtchn_irq_expected = true;
alarm(1);
@ -743,7 +743,7 @@ int main(int argc, char *argv[])
if (verbose)
printf("Testing SCHEDOP_poll wake on masked event\n");
tmr.u.timer.expires_ns = rs->state_entry_time + 100000000,
tmr.u.timer.expires_ns = rs->state_entry_time + 100000000;
vcpu_ioctl(vcpu, KVM_XEN_VCPU_SET_ATTR, &tmr);
alarm(1);
break;