From 4dd6f17eb913d3d23dd6c07950627ac2c3068dca Mon Sep 17 00:00:00 2001 From: Michael Mueller Date: Thu, 6 Jul 2017 14:22:20 +0200 Subject: KVM: s390: clear_io_irq() requests are not expected for adapter interrupts There is a chance to delete not yet delivered I/O interrupts if an exploiter uses the subsystem identification word 0x0000 while processing a KVM_DEV_FLIC_CLEAR_IO_IRQ ioctl. -EINVAL will be returned now instead in that case. Classic interrupts will always have bit 0x10000 set in the schid while adapter interrupts have a zero schid. The clear_io_irq interface is only useful for classic interrupts (as adapter interrupts belong to many devices). Let's make this interface more strict and forbid a schid of 0. Signed-off-by: Michael Mueller Reviewed-by: Halil Pasic Reviewed-by: Christian Borntraeger Reviewed-by: Cornelia Huck Signed-off-by: Christian Borntraeger --- Documentation/virtual/kvm/devices/s390_flic.txt | 3 +++ 1 file changed, 3 insertions(+) (limited to 'Documentation/virtual/kvm') diff --git a/Documentation/virtual/kvm/devices/s390_flic.txt b/Documentation/virtual/kvm/devices/s390_flic.txt index 2f1cbf1301d2..27ad53c7149d 100644 --- a/Documentation/virtual/kvm/devices/s390_flic.txt +++ b/Documentation/virtual/kvm/devices/s390_flic.txt @@ -156,3 +156,6 @@ FLIC with an unknown group or attribute gives the error code EINVAL (instead of ENXIO, as specified in the API documentation). It is not possible to conclude that a FLIC operation is unavailable based on the error code resulting from a usage attempt. + +Note: The KVM_DEV_FLIC_CLEAR_IO_IRQ ioctl will return EINVAL in case a zero +schid is specified. -- cgit v1.2.1