Siemens SIMATIC Devices Improper Input Validation (CVE-2024-38662)

bpf: Allow delete from sockmap/sockhash only if update is allowed. We have seen an influx of syzkaller reports where a BPF program attached to a tracepoint triggers a locking rule violation by performing a mapdelete on a sockmap/sockhash. We don't intend to support this artificial use scenario...