vsock: fix recursive ->recvmsg calls

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: vsock: fix recursive ->recvmsg calls After a vsock socket has been added to a BPF sockmap, its prot->recvmsg has been replaced with vsock_bpf_recvmsg(). Thus the following recursiion could happen: vsock_bpf_recvmsg() -> __vsock_recvmsg() -> vsock_connectible_recvmsg() -> prot->recvmsg() -> vsock_bpf_recvmsg() again We need to fix it by calling the original ->recvmsg() without any BPF sockmap logic in __vsock_recvmsg().

References

• https://git.kernel.org/stable/c/921f1acf0c3cf6b1260ab57a8a6e8b3d5f3023d5
• https://git.kernel.org/stable/c/b4ee8cf1acc5018ed1369150d7bb3e0d0f79e135
• https://git.kernel.org/stable/c/69139d2919dd4aa9a553c8245e7c63e82613e3fc