KVM: Device assignment: Check for privileges before assigning irq
Even though we don't share irqs at the moment, we should ensure
regular user processes don't try to allocate system resources.
We check for capability to access IO devices (CAP_SYS_RAWIO) before
we request_irq on behalf of the guest.
Noticed by Avi.
Signed-off-by: Amit Shah <amit.shah@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4a03375..fffdf4f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -191,6 +191,11 @@
kvm_assigned_dev_interrupt_work_handler);
if (irqchip_in_kernel(kvm)) {
+ if (!capable(CAP_SYS_RAWIO)) {
+ return -EPERM;
+ goto out;
+ }
+
if (assigned_irq->host_irq)
match->host_irq = assigned_irq->host_irq;
else