On Mon, 21 Oct 2024 at 17:28, Daniel Borkmann <daniel@xxxxxxxxxxxxx> wrote: > > Add a small test to pass an uninitialized mtu_len to the bpf_check_mtu() > helper to probe whether the verifier rejects it under !CAP_PERFMON. > > # ./vmtest.sh -- ./test_progs -t verifier_mtu > [...] > ./test_progs -t verifier_mtu > [ 1.414712] tsc: Refined TSC clocksource calibration: 3407.993 MHz > [ 1.415327] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fcd52370, max_idle_ns: 440795242006 ns > [ 1.416463] clocksource: Switched to clocksource tsc > [ 1.429842] bpf_testmod: loading out-of-tree module taints kernel. > [ 1.430283] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel > #510/1 verifier_mtu/uninit/mtu: write rejected:OK > #510 verifier_mtu:OK > Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED > > Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx> > --- Acked-by: Kumar Kartikeya Dwivedi <memxor@xxxxxxxxx>
