On Wed, Jul 27, 2016 at 07:46:23AM -0700, Jeff Vander Stoep wrote: > +++ b/kernel/events/core.c > @@ -355,7 +355,11 @@ static struct srcu_struct pmus_srcu; > * 2 - disallow kernel profiling for unpriv > * 3 - disallow all unpriv perf event use > */ > +#ifdef CONFIG_SECURITY_PERF_EVENTS_RESTRICT > +int sysctl_perf_event_paranoid __read_mostly = 3; > +#else > int sysctl_perf_event_paranoid __read_mostly = 2; > +#endif > > /* Minimum for 512 kiB + 1 user control page */ > int sysctl_perf_event_mlock __read_mostly = 512 + (PAGE_SIZE / 1024); /* 'free' kiB per user */ > diff --git a/security/Kconfig b/security/Kconfig > index df28f2b..2a93551 100644 > --- a/security/Kconfig > +++ b/security/Kconfig > @@ -18,6 +18,15 @@ config SECURITY_DMESG_RESTRICT > > If you are unsure how to answer this question, answer N. > > +config SECURITY_PERF_EVENTS_RESTRICT > + bool "Restrict unprivileged use of performance events" > + depends on PERF_EVENTS > + help > + If you say Y here, the kernel.perf_event_paranoid sysctl > + will be set to 3 by default, and no unprivileged use of the > + perf_event_open syscall will be permitted unless it is > + changed. NAK. Apart from the fact that I hate the 3 thing this is not how you do default CONFIG knobs for !bool state variables. Use an "int" config not a "bool" config and allow all options to be default. -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
