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KVM: s390: Reject KVM_SET_GSI_ROUTING on ucontrol VMs

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Prevent null pointer dereference when processing
KVM_IRQ_ROUTING_S390_ADAPTER routing entries.
The ioctl cannot be processed for ucontrol VMs.

Fixes: f65470661f ("KVM: s390/interrupt: do not pin adapter interrupt pages")
Signed-off-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Tested-by: Hariharan Mari <hari55@linux.ibm.com>
Reviewed-by: Hariharan Mari <hari55@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20241216092140.329196-4-schlameuss@linux.ibm.com
Message-ID: <20241216092140.329196-4-schlameuss@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
This commit is contained in:
Christoph Schlameuss 2024-12-16 10:21:37 +01:00 committed by Claudio Imbrenda
parent b07f6a30c7
commit 5021fd77d6
2 changed files with 5 additions and 0 deletions
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3
Documentation/virt/kvm/api.rst
View File

@ -1914,6 +1914,9 @@ No flags are specified so far, the corresponding field must be set to zero.
#define KVM_IRQ_ROUTING_HV_SINT 4
#define KVM_IRQ_ROUTING_XEN_EVTCHN 5
On s390, adding a KVM_IRQ_ROUTING_S390_ADAPTER is rejected on ucontrol VMs with
error -EINVAL.
flags:
- KVM_MSI_VALID_DEVID: used along with KVM_IRQ_ROUTING_MSI routing entry

2
arch/s390/kvm/interrupt.c
View File

@ -2898,6 +2898,8 @@ int kvm_set_routing_entry(struct kvm *kvm,
switch (ue->type) {
/* we store the userspace addresses instead of the guest addresses */
case KVM_IRQ_ROUTING_S390_ADAPTER:
if (kvm_is_ucontrol(kvm))
return -EINVAL;
e->set = set_adapter_int;
uaddr = gmap_translate(kvm->arch.gmap, ue->u.adapter.summary_addr);
if (uaddr == -EFAULT)