Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
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Date: Mon, 18 Dec 2017 22:37:38 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: "Tobin C. Harding" <me@...in.cc>
Cc: kernel-hardening@...ts.openwall.com, Tycho Andersen <tycho@...ho.ws>,
 Linus Torvalds <torvalds@...ux-foundation.org>, Kees Cook
 <keescook@...omium.org>, Andrew Morton <akpm@...ux-foundation.org>, Daniel
 Borkmann <daniel@...earbox.net>, Masahiro Yamada
 <yamada.masahiro@...ionext.com>, Alexei Starovoitov <ast@...nel.org>,
 linux-kernel@...r.kernel.org, Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH 3/3] trace: print address if symbol not found

On Tue, 19 Dec 2017 14:00:11 +1100
"Tobin C. Harding" <me@...in.cc> wrote:

> I ran through these as outlined here for the new version (v4). This hits
> the modified code but doesn't test symbol look up failure.

stacktrace shouldn't post non kernel values, unless there's a frame
pointer that isn't handled by kallsyms.

As for the other two, we could probably force a failure, like:

 # echo 'hist:keys=hrtimer.sym' > \
     events/timer/hrtimer_start/trigger
 # cat events/timer/hrtimer_start/hist

And then just add sym-offset too.

> 
> I also configured kernel with 'Perform a startup test on ftrace' for
> good luck.
> 
> Are you happy with this level of testing?

Can you try the above.

-- Steve

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