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vmm: forbid using special VSOCK CIDs for guests

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I accidentally ran a VM with CID 2 (VMADDR_CID_HOST), and very strange
and difficult to debug behavior ensued.  I don't think a virtio-vsock
device should be allowed to have any of the special CIDs
(VMADDR_CID_ANY, VMADDR_CID_HYPERVISOR, VMADDR_CID_LOCAL, VMADDR_CID_HOST).

Signed-off-by: Alyssa Ross <hi@alyssa.is>
This commit is contained in:
Alyssa Ross
2024-01-05 12:21:50 +01:00
committed by Rob Bradford
parent 5857d8a7cc
commit 7d0b85d727
2 changed files with 22 additions and 7 deletions
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vmm/src/lib.rs
+1 -1
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@@ -2673,7 +2673,7 @@ mod unit_tests {
#[test]
fn test_vmm_vm_cold_add_vsock() {
let mut vmm = create_dummy_vmm();
let vsock_config = VsockConfig::parse("socket=/tmp/sock,cid=1,iommu=on").unwrap();
let vsock_config = VsockConfig::parse("socket=/tmp/sock,cid=3,iommu=on").unwrap();
assert!(matches!(
vmm.vm_add_vsock(vsock_config.clone()),