Chirantan Ekbote 41e61d1fc3 virtio: queue: Enforce DescriptorChain ordering ... The virtio spec requires that all read-only descriptors appear in the chain before any write-only descriptors. Enforce this in the `checked_new` function by adding a new `required_flags` parameter. The `next_descriptor` function will set this to `VIRTQ_DESC_F_WRITE` if the current descriptor is write-only. This ensures that once we see a write-only descriptor, all following descriptors must be write-only. BUG=b:136127316 TEST=none Change-Id: Id8f942a4236a20f62f35439f3648dbec17e14c00 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1757239 Auto-Submit: Chirantan Ekbote <chirantan@chromium.org> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Stephen Barber <smbarber@chromium.org> Commit-Queue: Chirantan Ekbote <chirantan@chromium.org>		2019-10-06 05:35:47 +00:00
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src	virtio: queue: Enforce DescriptorChain ordering	2019-10-06 05:35:47 +00:00
Cargo.toml