[kernel-hardening] Re: [PATCH 3/3] trace: print address if symbol not found

Steven Rostedt
2017-12-19T03:37:38Z

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