KVM: fix error paths for failed gfn_to_page() calls

This bug was triggered:
[ 4220.198458] BUG: unable to handle kernel paging request at fffffffffffffffe
[ 4220.203907] IP: [<ffffffff81104d85>] put_page+0xf/0x34
......
[ 4220.237326] Call Trace:
[ 4220.237361]  [<ffffffffa03830d0>] kvm_arch_destroy_vm+0xf9/0x101 [kvm]
[ 4220.237382]  [<ffffffffa036fe53>] kvm_put_kvm+0xcc/0x127 [kvm]
[ 4220.237401]  [<ffffffffa03702bc>] kvm_vcpu_release+0x18/0x1c [kvm]
[ 4220.237407]  [<ffffffff81145425>] __fput+0x111/0x1ed
[ 4220.237411]  [<ffffffff8114550f>] ____fput+0xe/0x10
[ 4220.237418]  [<ffffffff81063511>] task_work_run+0x5d/0x88
[ 4220.237424]  [<ffffffff8104c3f7>] do_exit+0x2bf/0x7ca

The test case:

	printf(fmt, ##args);		\
	exit(-1);} while (0)

static int create_vm(void)
{
	int sys_fd, vm_fd;

	sys_fd = open("/dev/kvm", O_RDWR);
	if (sys_fd < 0)
		die("open /dev/kvm fail.\n");

	vm_fd = ioctl(sys_fd, KVM_CREATE_VM, 0);
	if (vm_fd < 0)
		die("KVM_CREATE_VM fail.\n");

	return vm_fd;
}

static int create_vcpu(int vm_fd)
{
	int vcpu_fd;

	vcpu_fd = ioctl(vm_fd, KVM_CREATE_VCPU, 0);
	if (vcpu_fd < 0)
		die("KVM_CREATE_VCPU ioctl.\n");
	printf("Create vcpu.\n");
	return vcpu_fd;
}

static void *vcpu_thread(void *arg)
{
	int vm_fd = (int)(long)arg;

	create_vcpu(vm_fd);
	return NULL;
}

int main(int argc, char *argv[])
{
	pthread_t thread;
	int vm_fd;

	(void)argc;
	(void)argv;

	vm_fd = create_vm();
	pthread_create(&thread, NULL, vcpu_thread, (void *)(long)vm_fd);
	printf("Exit.\n");
	return 0;
}

It caused by release kvm->arch.ept_identity_map_addr which is the
error page.

The parent thread can send KILL signal to the vcpu thread when it was
exiting which stops faulting pages and potentially allocating memory.
So gfn_to_pfn/gfn_to_page may fail at this time

Fixed by checking the page before it is used

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 002b4a566e2d030a73391b53b75a5905d5be72fc..b1eb202ee76a9265d920ca1b02d57aa1ff803d9a 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3619,6 +3619,7 @@ static void seg_setup(int seg)
 
 static int alloc_apic_access_page(struct kvm *kvm)
 {
+       struct page *page;
        struct kvm_userspace_memory_region kvm_userspace_mem;
        int r = 0;
 
@@ -3633,7 +3634,13 @@ static int alloc_apic_access_page(struct kvm *kvm)
        if (r)
                goto out;
 
-       kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
+       page = gfn_to_page(kvm, 0xfee00);
+       if (is_error_page(page)) {
+               r = -EFAULT;
+               goto out;
+       }
+
+       kvm->arch.apic_access_page = page;
 out:
        mutex_unlock(&kvm->slots_lock);
        return r;
@@ -3641,6 +3648,7 @@ out:
 
 static int alloc_identity_pagetable(struct kvm *kvm)
 {
+       struct page *page;
        struct kvm_userspace_memory_region kvm_userspace_mem;
        int r = 0;
 
@@ -3656,8 +3664,13 @@ static int alloc_identity_pagetable(struct kvm *kvm)
        if (r)
                goto out;
 
-       kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
-                       kvm->arch.ept_identity_map_addr >> PAGE_SHIFT);
+       page = gfn_to_page(kvm, kvm->arch.ept_identity_map_addr >> PAGE_SHIFT);
+       if (is_error_page(page)) {
+               r = -EFAULT;
+               goto out;
+       }
+
+       kvm->arch.ept_identity_pagetable = page;
 out:
        mutex_unlock(&kvm->slots_lock);
        return r;

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 148ed666e311fda2979887d6c9e9a2d440f75ffc..2966c847d489d84f1f2b3cb8450daf4bcce1d568 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5113,17 +5113,20 @@ static void post_kvm_run_save(struct kvm_vcpu *vcpu)
                        !kvm_event_needs_reinjection(vcpu);
 }
 
-static void vapic_enter(struct kvm_vcpu *vcpu)
+static int vapic_enter(struct kvm_vcpu *vcpu)
 {
        struct kvm_lapic *apic = vcpu->arch.apic;
        struct page *page;
 
        if (!apic || !apic->vapic_addr)
-               return;
+               return 0;
 
        page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
+       if (is_error_page(page))
+               return -EFAULT;
 
        vcpu->arch.apic->vapic_page = page;
+       return 0;
 }
 
 static void vapic_exit(struct kvm_vcpu *vcpu)
@@ -5430,7 +5433,11 @@ static int __vcpu_run(struct kvm_vcpu *vcpu)
        }
 
        vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
-       vapic_enter(vcpu);
+       r = vapic_enter(vcpu);
+       if (r) {
+               srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
+               return r;
+       }
 
        r = 1;
        while (r > 0) {