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SubjectRe: tracefs splats in lockdown=confidentiality mode
On Mon, 2 Dec 2019 15:31:52 -0800
Matthew Garrett <mjg59@google.com> wrote:

> On Fri, Nov 1, 2019 at 2:08 PM dann frazier <dann.frazier@canonical.com> wrote:
>
> > [ 1.763630] Lockdown: swapper/0: use of tracefs is restricted; see man kernel_lockdown.7
>
> This is expected.
>
> > [ 2.913934] ------------[ cut here ]------------
> > [ 2.918435] Could not register function stat for cpu 0
> > [ 2.923717] WARNING: CPU: 1 PID: 1 at kernel/trace/ftrace.c:987 ftrace_init_tracefs_toplevel+0x168/0x1bc
>
> This is not. I'll look into it.

I think it has to do with ftrace triggering WARN_ON() if it fails to
create files. We don't want this to happen if it fails because of
lockdown.

I'm already looking into it.

Thanks!

-- Steve

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