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Date: Wed, 24 May 2017 08:20:06 +0200 (CEST)
From: Thomas Gleixner <tglx@linutronix.de>
To: Steven Rostedt <rostedt@goodmis.org>
cc: Kees Cook <keescook@chromium.org>, LKML <linux-kernel@vger.kernel.org>,
        x86@kernel.org, Masami Hiramatsu <mhiramat@kernel.org>,
        "Luis R. Rodriguez" <mcgrof@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>
Subject: Re: [WARNING] x86/mm: Found insecure W+X mapping at address ..
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On Tue, 23 May 2017, Steven Rostedt wrote:

> On Tue, 23 May 2017 22:48:19 +0200 (CEST)
> Thomas Gleixner <tglx@linutronix.de> wrote:
> 
> 
> > It's not KPROBES, it's the new fangled ftrace trampoline code. I
> > added a few printks. All the leaked W+X mappings are allocated via
> > this callchain:
> 
> The trampoline code isn't new. But it has new users because of the
> introduction to synchronize_rcu_tasks(), and there was a bug I fixed in
> -rc2 that moved it down because the test was run before
> synchronize_rcu_tasks() was functional.
> 
> Is this still a bug in rc2?

Yes. Otherwise we wouldn't talking about.

Thanks,

	tglx