On Thu, 29 Aug 2019 10:23:10 -0700 Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx> wrote: > > CAP_TRACE_KERNEL: Use all of perf, ftrace, kprobe, etc. > > > > CAP_TRACE_USER: Use all of perf with scope limited to user mode and uprobes. > > imo that makes little sense from security pov, since > such CAP_TRACE_KERNEL (ex kprobe) can trace "unrelated user process" > just as well. Yet not letting it do cleanly via uprobe. > Sort of like giving a spare key for back door of the house and > saying no, you cannot have main door key. I took it as CAP_TRACE_KERNEL as a superset of CAP_TRACE_USER. That is, if you have CAP_TRACE_KERNEL, by default you get USER. Where as CAP_TRACE_USER, is much more limiting. -- Steve
