x86/irq: Ensure PI wakeup handler is unregistered before module unload

commit 6ff53f6a438f72998f56e82e76694a1df9d1ea2c upstream.

Add a synchronize_rcu() after clearing the posted interrupt wakeup handler
to ensure all readers, i.e. in-flight IRQ handlers, see the new handler
before returning to the caller.  If the caller is an exiting module and
is unregistering its handler, failure to wait could result in the IRQ
handler jumping into an unloaded module.

The registration path doesn't require synchronization, as it's the
caller's responsibility to not generate interrupts it cares about until
after its handler is registered.

Fixes: f6b3c72c2366 ("x86/irq: Define a global vector for VT-d Posted-Interrupts")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20211009001107.3936588-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index a975246074b5c571e7346228553467e8f8244895..ef3317c6d6d16f306d950a392d8e19537e3a54ef 100644 (file)
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -290,8 +290,10 @@ void kvm_set_posted_intr_wakeup_handler(void (*handler)(void))
 {
        if (handler)
                kvm_posted_intr_wakeup_handler = handler;
-       else
+       else {
                kvm_posted_intr_wakeup_handler = dummy_handler;
+               synchronize_rcu();
+       }
 }
 EXPORT_SYMBOL_GPL(kvm_set_posted_intr_wakeup_handler);