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

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Date:   Fri, 26 May 2017 10:34:48 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.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 11:18:02 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> 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?

Yes, however, it should be included after my fix is
accepted, or it can cause a kernel panic...

Thanks,



-- 
Masami Hiramatsu <mhiramat@...nel.org>