From 782ce21c1a935315455b2381e56b059425805486 Mon Sep 17 00:00:00 2001 From: Anatol Belski Date: Thu, 14 May 2026 17:02:24 +0200 Subject: [PATCH] vm-virtio: checked_descriptor: Add unit test for out of range descriptor Add rejects_out_of_range_descriptor which submits a descriptor whose length overshoots guest memory and verifies CheckedDescriptorIter yields no descriptor and sets the failed flag. Signed-off-by: Anatol Belski --- vm-virtio/src/checked_descriptor.rs | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/vm-virtio/src/checked_descriptor.rs b/vm-virtio/src/checked_descriptor.rs index aa5555e0c..60ab654b0 100644 --- a/vm-virtio/src/checked_descriptor.rs +++ b/vm-virtio/src/checked_descriptor.rs @@ -228,4 +228,14 @@ mod unit_tests { assert!(desc.is_write_only()); assert!(it.next().is_none()); } + + #[test] + fn rejects_out_of_range_descriptor() { + let (_mem, mem_atomic, mut queue) = setup_vq(128 * 1024, 0x4000, 1 << 30, 0); + let mem_guard = mem_atomic.memory(); + let mut chain = queue.pop_descriptor_chain(mem_guard).unwrap(); + let mut it = chain.checked_iter(None); + let result = it.next().expect("iterator must yield an item"); + result.unwrap_err(); + } }