netdev - Re: [kernel-hardening] Re: [RFC 0/3] kallsyms: don't leak address when printing symbol

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Message-ID: <CAPDLWs8tJ5voge-gS-W+gxpRRk2GximPkGm1d9pxf5QNbCKufA@mail.gmail.com>
Date:   Tue, 28 Nov 2017 08:58:44 +0530
From:   Kaiwan N Billimoria <kaiwan@...wantech.com>
To:     "Tobin C. Harding" <me@...in.cc>
Cc:     Kees Cook <keescook@...omium.org>,
        kernel-hardening@...ts.openwall.com,
        LKML <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tycho Andersen <tycho@...ho.ws>
Subject: Re: [kernel-hardening] Re: [RFC 0/3] kallsyms: don't leak address
 when printing symbol

On Tue, Nov 28, 2017 at 7:20 AM, Tobin C. Harding <me@...in.cc> wrote:
>
> Noob question: how do we _know_ this. In other words how do we know no
> userland tools rely on the current behaviour? No stress to answer Kees,
> this is a pretty general kernel dev question.

Perhaps I'm reading this wrong, but anyway: besides ftrace, kprobes
will require a
symbol-to-address lookup. Specifically, in the function
kprobe_lookup_name() which
in turn invokes kallsyms_lookup_name().
AFAIK, SystemTap (userland) is built on top of the kprobes infrastructure..

thanks,
Kaiwan.