On Sun, Apr 08, 2018 at 04:07:42PM +0800, joeyli wrote: > > > If the only thing that folks are paranoid about is reading > > arbitrary kernel memory with bpf_probe_read() helper > > then preferred patch would be to disable it during verification > > when in lockdown mode > > Sorry for I didn't fully understand your idea... > Do you mean that using bpf verifier to filter out bpf program that > uses bpf_probe_read()?
Take a look bpf_get_trace_printk_proto(). Similarly we can add bpf_get_probe_read_proto() that will return NULL if lockdown is on. Then programs with bpf_probe_read() will be rejected by the verifier.
