From: Dave Jones <davej@redhat.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: FTRACE_WARN_ON((rec->flags & ~FTRACE_FL_MASK) == 0))
Date: Thu, 30 Jan 2014 00:32:32 -0500 [thread overview]
Message-ID: <20140130053232.GA14856@redhat.com> (raw)
In-Reply-To: <cbf0c86a-317e-451f-9bb4-48c582ab4e1e@email.android.com>
On Wed, Jan 29, 2014 at 11:50:43PM -0500, Steven Rostedt wrote:
> Are you running as root? If not, you found another way to get perf to start function tracing.
Good point. In this case, I was trying some new experimental trinity code
that starts as root, generates fd's, then drops privs before doing syscalls.
So the "generate fds" part did some perf_event_open's as root, yeah.
While that's less scary from a security pov than it was last time, it's still
something that aparently needs fixing.
Dave
next prev parent reply other threads:[~2014-01-30 5:32 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-30 4:16 FTRACE_WARN_ON((rec->flags & ~FTRACE_FL_MASK) == 0)) Dave Jones
2014-01-30 4:50 ` Steven Rostedt
2014-01-30 5:32 ` Dave Jones [this message]
2014-01-30 13:55 ` Steven Rostedt
-- strict thread matches above, loose matches on Subject: below --
2013-08-28 3:46 Dave Jones
2013-08-28 13:54 ` Steven Rostedt
2013-08-28 13:58 ` Steven Rostedt
2013-08-28 15:17 ` Steven Rostedt
2013-08-28 18:27 ` Dave Jones
2013-08-28 18:29 ` Dave Jones
2013-08-28 19:27 ` Steven Rostedt
2013-09-30 17:12 ` Dave Jones
2013-10-01 3:56 ` Steven Rostedt
2013-10-01 4:20 ` Dave Jones
2013-10-01 12:28 ` Steven Rostedt
2013-10-02 14:16 ` Dave Jones
2013-10-02 16:43 ` Steven Rostedt
2013-10-02 16:53 ` Dave Jones
2013-08-28 14:31 ` Steven Rostedt
2013-08-28 16:23 ` Dave Jones
2013-08-28 16:50 ` Vince Weaver
2013-08-28 16:57 ` Steven Rostedt
2013-08-28 17:33 ` Dave Jones
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