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 ..
Date: Wed, 24 May 2017 08:20:06 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.20.1705240819320.2201@nanos> (raw)
In-Reply-To: <20170523185912.05346057@vmware.local.home>
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
prev parent reply other threads:[~2017-05-24 6:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-23 15:40 [WARNING] x86/mm: Found insecure W+X mapping at address Thomas Gleixner
2017-05-23 15:54 ` Kees Cook
2017-05-23 16:35 ` Thomas Gleixner
2017-05-23 20:48 ` Thomas Gleixner
2017-05-23 22:59 ` Steven Rostedt
2017-05-24 6:20 ` Thomas Gleixner [this message]
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