linux-kernel - Re: FTRACE_WARN_ON((rec->flags & ~FTRACE_FL

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Message-ID: <20140130053232.GA14856@redhat.com>
Date:	Thu, 30 Jan 2014 00:32:32 -0500
From:	Dave Jones <davej@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: FTRACE_WARN_ON((rec->flags & ~FTRACE_FL_MASK) == 0))

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

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