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KVM: VMX: Do _all_ initialization before exposing /dev/kvm to userspace

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Call kvm_init() only after _all_ setup is complete, as kvm_init() exposes
/dev/kvm to userspace and thus allows userspace to create VMs (and call
other ioctls).  E.g. KVM will encounter a NULL pointer when attempting to
add a vCPU to the per-CPU loaded_vmcss_on_cpu list if userspace is able to
create a VM before vmx_init() configures said list.

 BUG: kernel NULL pointer dereference, address: 0000000000000008
 #PF: supervisor write access in kernel mode
 #PF: error_code(0x0002) - not-present page
 PGD 0 P4D 0
 Oops: 0002 [#1] SMP
 CPU: 6 PID: 1143 Comm: stable Not tainted 6.0.0-rc7+ #988
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
 RIP: 0010:vmx_vcpu_load_vmcs+0x68/0x230 [kvm_intel]
  <TASK>
  vmx_vcpu_load+0x16/0x60 [kvm_intel]
  kvm_arch_vcpu_load+0x32/0x1f0 [kvm]
  vcpu_load+0x2f/0x40 [kvm]
  kvm_arch_vcpu_create+0x231/0x310 [kvm]
  kvm_vm_ioctl+0x79f/0xe10 [kvm]
  ? handle_mm_fault+0xb1/0x220
  __x64_sys_ioctl+0x80/0xb0
  do_syscall_64+0x2b/0x50
  entry_SYSCALL_64_after_hwframe+0x46/0xb0
 RIP: 0033:0x7f5a6b05743b
  </TASK>
 Modules linked in: vhost_net vhost vhost_iotlb tap kvm_intel(+) kvm irqbypass

Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20221130230934.1014142-15-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-11-30 23:08:58 +00:00 committed by Paolo Bonzini
parent 4f8396b96a
commit e32b120071
1 changed files with 19 additions and 11 deletions
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30
arch/x86/kvm/vmx/vmx.c
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@ -8564,19 +8564,23 @@ static void vmx_cleanup_l1d_flush(void)
l1tf_vmx_mitigation = VMENTER_L1D_FLUSH_AUTO;
}
static void vmx_exit(void)
static void __vmx_exit(void)
{
allow_smaller_maxphyaddr = false;
#ifdef CONFIG_KEXEC_CORE
RCU_INIT_POINTER(crash_vmclear_loaded_vmcss, NULL);
synchronize_rcu();
#endif
vmx_cleanup_l1d_flush();
}
static void vmx_exit(void)
{
kvm_exit();
kvm_x86_vendor_exit();
vmx_cleanup_l1d_flush();
allow_smaller_maxphyaddr = false;
__vmx_exit();
}
module_exit(vmx_exit);
@ -8594,11 +8598,6 @@ static int __init vmx_init(void)
if (r)
return r;
r = kvm_init(&vmx_init_ops, sizeof(struct vcpu_vmx),
__alignof__(struct vcpu_vmx), THIS_MODULE);
if (r)
goto err_kvm_init;
/*
* Must be called after common x86 init so enable_ept is properly set
* up. Hand the parameter mitigation value in which was stored in
@ -8632,11 +8631,20 @@ static int __init vmx_init(void)
if (!enable_ept)
allow_smaller_maxphyaddr = true;
/*
* Common KVM initialization _must_ come last, after this, /dev/kvm is
* exposed to userspace!
*/
r = kvm_init(&vmx_init_ops, sizeof(struct vcpu_vmx),
__alignof__(struct vcpu_vmx), THIS_MODULE);
if (r)
goto err_kvm_init;
return 0;
err_l1d_flush:
vmx_exit();
err_kvm_init:
__vmx_exit();
err_l1d_flush:
kvm_x86_vendor_exit();
return r;
}