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

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Date:   Thu, 25 May 2017 11:18:02 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] x86/ftrace: Make sure that ftrace trampolines are not
 RWX

On Thu, 25 May 2017 19:34:43 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:


> OK, I've ensured that following command hits same BUG.
> 
> grep t /proc/kallsyms  | cut -f3 -d" " | grep -v .*\\..* | \
> head -n 256 | while read i; do echo p $i+5 ; done >
> tracing/kprobe_events
> 
> echo 1 > tracing/events/kprobes/enable 
> echo 0 > tracing/events/kprobes/enable
> echo > tracing/kprobe_events
> sleep 5

Hi Masami,

Can you add a selftest that checks this too?

Thanks!

-- Steve

> 
> I'll send a bugfix asap.
> 
> Thank,
>