From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Daniel Micay <danielmicay@gmail.com>,
kernel-hardening@lists.openwall.com,
Mark Rutland <mark.rutland@arm.com>,
Ingo Molnar <mingo@redhat.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Jeff Vander Stoep <jeffv@google.com>
Subject: Re: [kernel-hardening] [PATCH 1/2] security, perf: allow further restriction of perf_event_open
Date: Wed, 19 Oct 2016 07:26:02 -0300 [thread overview]
Message-ID: <20161019102602.GA25522@kernel.org> (raw)
In-Reply-To: <20161019100126.GI3102@twins.programming.kicks-ass.net>
Em Wed, Oct 19, 2016 at 12:01:26PM +0200, Peter Zijlstra escreveu:
> On Tue, Oct 18, 2016 at 05:15:01PM -0400, Daniel Micay wrote:
> > It's also worth noting that fine-grained control via a scoped mechanism
> > would likely only be used to implement *more restrictions* on Android,
> > not to make the feature less aggressive.
> > It's desirable for perf events to be disabled by default for non-root
> > across the board on Android.
> Right, but this is Android. The knob seems to now also live in Debian
> (and derived) distros. And there it is utter crap.
> It completely defeats having perf for a fairly large segment of
> corporate developers who do not get to have root on their own machines
> (which is stupid policy but whatever).
> It similarly defeats development of self profiling JITs and whatnot.
> A capability would allow people to run perf (or another sanctioned
> binary), even though in general they cannot do sys_perf_event_open().
But self profiling JITs would be useful for non-developers, on Android
(anywhere, really), and for that it would require being able to at
least, well, self profile, using sys_perf_event_open() by a normal
process, limited to profiling itself, no?
This not being possible, self profiling will use some other means, its
like sys_perf_event_open() never existed for them.
- Arnaldo
next prev parent reply other threads:[~2016-10-19 10:26 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-27 14:45 [kernel-hardening] [PATCH 1/2] security, perf: allow further restriction of perf_event_open Jeff Vander Stoep
2016-07-27 20:43 ` Kees Cook
2016-08-02 9:52 ` [kernel-hardening] " Peter Zijlstra
2016-08-02 13:04 ` Arnaldo Carvalho de Melo
2016-08-02 13:10 ` Daniel Micay
2016-08-02 13:16 ` Daniel Micay
2016-08-02 19:04 ` Kees Cook
2016-08-02 20:30 ` Peter Zijlstra
2016-08-02 20:51 ` Kees Cook
2016-08-02 21:06 ` Jeffrey Vander Stoep
2016-08-03 8:28 ` Ingo Molnar
2016-08-03 12:28 ` Daniel Micay
2016-08-03 12:53 ` Daniel Micay
2016-08-03 13:36 ` Peter Zijlstra
2016-08-03 14:41 ` Peter Zijlstra
2016-08-03 15:42 ` Schaufler, Casey
2016-08-03 17:25 ` Eric W. Biederman
2016-08-03 18:53 ` Kees Cook
2016-08-03 21:44 ` Peter Zijlstra
2016-08-04 2:50 ` Eric W. Biederman
2016-08-04 9:11 ` Peter Zijlstra
2016-08-04 15:13 ` Eric W. Biederman
2016-08-04 15:37 ` Peter Zijlstra
2016-08-03 19:36 ` Daniel Micay
2016-08-04 10:28 ` Mark Rutland
2016-08-04 13:45 ` Daniel Micay
2016-08-04 14:11 ` Peter Zijlstra
2016-08-04 15:44 ` Daniel Micay
2016-08-04 15:55 ` Peter Zijlstra
2016-08-04 16:10 ` Mark Rutland
2016-08-04 16:32 ` Daniel Micay
2016-08-04 17:09 ` Mark Rutland
2016-08-04 17:36 ` Daniel Micay
2016-08-02 21:16 ` Jeffrey Vander Stoep
2016-10-17 13:44 ` [kernel-hardening] " Mark Rutland
2016-10-17 14:54 ` Daniel Micay
2016-10-19 9:41 ` Mark Rutland
2016-10-19 15:16 ` Daniel Micay
2016-10-18 20:48 ` Kees Cook
2016-10-18 21:15 ` Daniel Micay
2016-10-19 9:56 ` Mark Rutland
2016-10-19 10:01 ` Peter Zijlstra
2016-10-19 10:26 ` Arnaldo Carvalho de Melo [this message]
2016-10-19 10:40 ` Peter Zijlstra
2016-10-19 15:39 ` Daniel Micay
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