From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: Matthew Garrett <mjg59@google.com>, Dmitry Vyukov <dvyukov@google.com>
Cc: Andi Kleen <ak@linux.intel.com>,
"Theodore Y. Ts'o" <tytso@mit.edu>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Petr Mladek <pmladek@suse.com>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Arnd Bergmann <arnd@arndb.de>, Jiri Slaby <jslaby@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] kconfig: Add kernel config option for fuzz testing.
Date: Fri, 28 Feb 2020 07:10:12 +0900 [thread overview]
Message-ID: <9e5b7fde-4a18-a10b-fc53-c025bf96e8f9@i-love.sakura.ne.jp> (raw)
In-Reply-To: <4abd90ad-dc1a-7228-1f1c-b106097bcaef@i-love.sakura.ne.jp>
On 2020/02/18 19:54, Tetsuo Handa wrote:
> On 2020/01/03 4:57, Matthew Garrett wrote:
>> On Tue, Dec 17, 2019 at 12:53 AM Dmitry Vyukov <dvyukov@google.com> wrote:
>>> +Matthew for a lockdown question
>>> We are considering [ab]using lockdown (you knew this will happen!) for
>>> fuzzing kernel. LOCKDOWN_DEBUGFS is a no-go for us and we may want a
>>> few other things that may be fuzzing-specific.
>>> The current inflexibility comes from the global ordering of levels:
>>>
>>> if (kernel_locked_down >= level)
>>> if (kernel_locked_down >= what) {
>>>
>>> Is it done for performance? Or for simplicity?
>>
>> Simplicity. Based on discussion, we didn't want the lockdown LSM to
>> enable arbitrary combinations of lockdown primitives, both because
>> that would make it extremely difficult for userland developers and
>> because it would make it extremely easy for local admins to
>> accidentally configure policies that didn't achieve the desired
>> outcome. There's no inherent problem in adding new options, but really
>> right now they should fall into cases where they're protecting either
>> the integrity of the kernel or preventing leakage of confidential
>> information from the kernel.
>>
>
> Can we resume this topic?
>
> I think build-time lockdown (i.e. kernel config option) is more reliable
> and easier to use.
>
Here is an example of need to lockdown specific ations. Can we proceed?
https://lkml.kernel.org/r/CACT4Y+azQXLcPqtJG9zbj8hxqw4jE3dcwUj5T06bdL3uMaZk+Q@mail.gmail.com
next prev parent reply other threads:[~2020-02-27 22:11 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-16 9:59 [PATCH] kconfig: Add kernel config option for fuzz testing Tetsuo Handa
2019-12-16 11:46 ` Greg Kroah-Hartman
2019-12-16 15:35 ` Tetsuo Handa
2019-12-16 16:31 ` Greg Kroah-Hartman
2019-12-16 20:18 ` Theodore Y. Ts'o
2019-12-16 21:06 ` Tetsuo Handa
2019-12-17 8:36 ` Dmitry Vyukov
2019-12-17 8:53 ` Dmitry Vyukov
2020-01-02 19:57 ` Matthew Garrett
2020-02-18 10:54 ` Tetsuo Handa
2020-02-27 22:10 ` Tetsuo Handa [this message]
2020-02-27 22:15 ` Matthew Garrett
2019-12-17 15:52 ` Theodore Y. Ts'o
2019-12-19 17:43 ` Dmitry Vyukov
2019-12-19 21:18 ` Theodore Y. Ts'o
2019-12-18 10:29 ` Tetsuo Handa
2019-12-19 17:21 ` Dmitry Vyukov
2019-12-16 18:34 ` Andi Kleen
2019-12-16 18:47 ` Greg Kroah-Hartman
2019-12-17 5:12 ` Sergey Senozhatsky
2019-12-17 7:54 ` Dmitry Vyukov
2019-12-17 8:24 ` Sergey Senozhatsky
2019-12-17 8:38 ` Dmitry Vyukov
2019-12-17 5:42 ` Masahiro Yamada
2019-12-17 8:41 ` Dmitry Vyukov
2019-12-17 12:54 ` Tetsuo Handa
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