linux-kernel - Re: [PATCH] x86/ftrace: Make sure that ftrace trampolines are not RWX

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Date:   Wed, 24 May 2017 21:34:03 +0200
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] x86/ftrace: Make sure that ftrace trampolines are not RWX

On Wed, May 24, 2017 at 08:53:00PM +0200, Thomas Gleixner wrote:
> On Wed, 24 May 2017, Luis R. Rodriguez wrote:
> > [  440.548057] CPU: 2 PID: 1765 Comm: ftracetest Tainted: G            E
> 
> 4.12.0-rc1-next-20170519+ #155
> 
> Can you please try that patch against plain 4.12-rc2?

Yup, just tried it. Same trace. Could we need to do something
special at __unregister_ftrace_function() and friends ?

  Luis