linux-kernel - Re: [PATCH V2] x86/ftrace: Make sure that ftrace trampolines are not RWX

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Message-ID: <20170526095839.7fa9135b@gandalf.local.home>
Date:   Fri, 26 May 2017 09:58:39 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH V2] x86/ftrace: Make sure that ftrace trampolines are
 not RWX

On Fri, 26 May 2017 15:50:38 +0200 (CEST)
Thomas Gleixner <tglx@...utronix.de> wrote:


> That's very early boot, right? So interrupts have to be disabled.
> 
> So this wants to be:
> 
>    BUG_ON(irqs_disabled() && !early_boot_irqs_disabled);
> 

I was thinking the same thing. I'll add a patch and retest.

Thanks!

-- Steve