Peter Zijlstra <[email protected]> writes: > On Mon, Oct 13, 2014 at 04:45:40PM +0300, Alexander Shishkin wrote: >> +static bool pt_event_valid(struct perf_event *event) >> +{ >> + u64 config = event->attr.config; >> + >> + /* admin can set any packet generation parameters */ >> + if (capable(CAP_SYS_ADMIN) && (config & PT_BYPASS_MASK) == config) >> + return true; >> + >> + if ((config & PT_CONFIG_MASK) != config) >> + return false; >> + >> + return true; >> +} > > This seems to suggest PT is available to !priv users, is this right?
Yes, that's the intention. PT does CPL-based filtering in hardware and unlike previous attempts at branch tracing, does not leak out-of-context addresses (or any other information for that matter). Regards, -- Alex -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
