Loopback transport coalesces some skbs too eagerly. Handling a zerocopy (non-linear) skb as a linear one leads to skb data loss and kernel memory disclosure.
Plug the loss/leak by allowing only linear skb join. Provide a test. Signed-off-by: Michal Luczaj <[email protected]> --- Michal Luczaj (2): vsock/virtio: Coalesce only linear skb vsock/test: Add test for a linear and non-linear skb getting coalesced net/vmw_vsock/virtio_transport_common.c | 3 +- tools/testing/vsock/vsock_test.c | 5 +++ tools/testing/vsock/vsock_test_zerocopy.c | 67 +++++++++++++++++++++++++++++++ tools/testing/vsock/vsock_test_zerocopy.h | 3 ++ 4 files changed, 77 insertions(+), 1 deletion(-) --- base-commit: 653267321f05316f159e05b3ef562aa700632db6 change-id: 20260103-vsock-recv-coalescence-38178fafd10c Best regards, -- Michal Luczaj <[email protected]>
