Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Fri, 27 Jul 2018 16:21:14 -0400
From:   "Theodore Y. Ts'o" <tytso@mit.edu>
To:     Steven Rostedt <rostedt@goodmis.org>
Cc:     Jann Horn <jannh@google.com>, salyzyn@google.com,
        Nick Desaulniers <ndesaulniers@google.com>,
        Golden_Miller83@protonmail.ch, Greg KH <greg@kroah.com>,
        Kees Cook <keescook@google.com>, salyzyn@android.com,
        kernel list <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@redhat.com>, kernel-team@android.com,
        stable@vger.kernel.org,
        Kernel Hardening <kernel-hardening@lists.openwall.com>,
        Jeffrey Vander Stoep <jeffv@google.com>
Subject: Re: [PATCH] tracing: do not leak kernel addresses
Message-ID: <20180727202114.GH13922@thunk.org>
Mail-Followup-To: "Theodore Y. Ts'o" <tytso@mit.edu>,
        Steven Rostedt <rostedt@goodmis.org>, Jann Horn <jannh@google.com>,
        salyzyn@google.com, Nick Desaulniers <ndesaulniers@google.com>,
        Golden_Miller83@protonmail.ch, Greg KH <greg@kroah.com>,
        Kees Cook <keescook@google.com>, salyzyn@android.com,
        kernel list <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@redhat.com>, kernel-team@android.com,
        stable@vger.kernel.org,
        Kernel Hardening <kernel-hardening@lists.openwall.com>,
        Jeffrey Vander Stoep <jeffv@google.com>
References: <753E9YR1QhdsPhsFoYuXCwfUzfyntDrc_A93hMUkktMi7lbh3KUZMcbfqKVWUfi15zYhuiDFant-ROa4QNV5shx74ff4hGngq2BOJDv-hq4=@protonmail.ch>
 <CAG48ez1U=5nTOrnOqwMuXhdER-7XxJUYLcyYNuczwasQLQ0gXA@mail.gmail.com>
 <20180727094730.3a448629@gandalf.local.home>
 <CAKwvOdmg4DSSwy9YBccYWzc+6ZU2yKSSFmfnj72wqbYDJU0gzw@mail.gmail.com>
 <20180727143141.4b53d554@gandalf.local.home>
 <CAMx4XWv3OazvURuN1XU2+5C5tNDzPuTniMn_T=XTA4P8_uwS_A@mail.gmail.com>
 <CAG48ez25zgjTQRux_rk1fn2DUVthtK31dRU9cxE+55pBGmYjXQ@mail.gmail.com>
 <CAG48ez1MdupASE1DMt0OWXv+rqZO-2GAbfDthEQcvNXrc2pTsQ@mail.gmail.com>
 <20180727195416.GF13922@thunk.org>
 <20180727161103.797f12b7@gandalf.local.home>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20180727161103.797f12b7@gandalf.local.home>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Fri, Jul 27, 2018 at 04:11:03PM -0400, Steven Rostedt wrote:
> That said, I would assume that
> other Android utilities are using other debugfs files for system
> status and such.

Yeah, I know we probably have lost the "debugfs is only for debugging
and has no place in a production system" battle, and we should just
move on and assume we need to completely harden all of debugfs.  But
it's worth at least *asking* whether or not the use of debugfs for
Android can be avoided....

					- Ted