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From: James Morris <jmorris@namei.org>
To: Andy Lutomirski <luto@kernel.org>
Cc: Stephen Hemminger <stephen@networkplumber.org>,
	Linux API <linux-api@vger.kernel.org>,
	Matthew Garrett <matthewgarrett@google.com>,
	LSM List <linux-security-module@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	David Howells <dhowells@redhat.com>,
	Alexei Starovoitov <alexei.starovoitov@gmail.com>,
	Network Development <netdev@vger.kernel.org>,
	Chun-Yi Lee <jlee@suse.com>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Kees Cook <keescook@chromium.org>, Will Drewry <wad@chromium.org>
Subject: Re: [PATCH 23/27] bpf: Restrict kernel image access functions when the kernel is locked down
Date: Wed, 27 Mar 2019 05:57:07 +1100 (AEDT)
Message-ID: <alpine.LRH.2.21.1903270523240.5235@namei.org> (raw)
In-Reply-To: <CALCETrU=EqqRwyQGBT0=_N9-E_pBM53=z+WJrd9OzV7g6xJa0A@mail.gmail.com>

On Mon, 25 Mar 2019, Andy Lutomirski wrote:

> A while back, I suggested an approach to actually make this stuff
> mergeable: submit a patch series that adds lockdown mode, enables it
> by command line option (and maybe sysctl) *only* and has either no
> effect or only a token effect.  Then we can add actual features to
> lockdown mode one at a time and review them separately.

This makes sense to me.

> 
> And I'm going to complain loudly unless two things change about this
> whole thing:
> 
> 1. Lockdown mode becomes three states, not a boolean.  The states are:
> no lockdown, best-effort-to-protect-kernel-integrity, and
> best-effort-to-protect-kernel-secrecy-and-integrity.  And this BPF
> mess illustrates why: most users will really strongly object to
> turning off BPF when they actually just want to protect kernel
> integrity.  And as far as I know, things like Secure Boot policy will
> mostly care about integrity, not secrecy, and tracing and such should
> work on a normal locked-down kernel.  So I think we need this knob.

Another approach would be to make this entirely policy based:

- Assign an ID to each lockdown point
- Implement a policy mechanism where each ID is mapped to 0 or 1
- Allow this policy to be specified statically or dynamically

So, 

	kernel_is_locked_down("ioperm")

becomes

	kernel_is_locked_down(LOCKDOWN_IOPERM)

and this function checks e.g.

	if (lockdown_polcy[id]) {
		fail or warn;
        }

Thoughts?


> 2. All the proponents of this series, and the documentation, needs to
> document that it's best effort.  There will always be security bugs,
> and there will always be things we miss.

Right.  Maintaining this feature will be an ongoing effort, and if its not 
actively maintained, it will bitrot and become useless.


-- 
James Morris
<jmorris@namei.org>


  reply index

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-25 22:09 [PULL REQUEST] Lockdown patches for 5.2 Matthew Garrett
2019-03-25 22:09 ` [PATCH 01/27] Add the ability to lock down access to the running kernel image Matthew Garrett
2019-03-26  5:30   ` Matthew Garrett
2019-03-25 22:09 ` [PATCH 02/27] Enforce module signatures if the kernel is locked down Matthew Garrett
2019-03-25 22:09 ` [PATCH 03/27] Restrict /dev/{mem,kmem,port} when " Matthew Garrett
2019-03-25 22:09 ` [PATCH 04/27] kexec_load: Disable at runtime if " Matthew Garrett
2019-03-25 22:09 ` [PATCH 05/27] Copy secure_boot flag in boot params across kexec reboot Matthew Garrett
2019-03-25 22:09 ` [PATCH 06/27] kexec_file: split KEXEC_VERIFY_SIG into KEXEC_SIG and KEXEC_SIG_FORCE Matthew Garrett
2019-03-25 22:09 ` [PATCH 07/27] kexec_file: Restrict at runtime if the kernel is locked down Matthew Garrett
2019-03-25 22:09 ` [PATCH 08/27] hibernate: Disable when " Matthew Garrett
2019-03-25 22:09 ` [PATCH 09/27] uswsusp: " Matthew Garrett
2019-03-25 22:09 ` [PATCH 10/27] PCI: Lock down BAR access " Matthew Garrett
2019-03-25 22:09 ` [PATCH 11/27] x86: Lock down IO port " Matthew Garrett
2019-03-25 22:09 ` [PATCH 12/27] x86/msr: Restrict MSR " Matthew Garrett
2019-03-25 23:40   ` Thomas Gleixner
2019-03-25 22:09 ` [PATCH 13/27] ACPI: Limit access to custom_method " Matthew Garrett
2019-03-25 22:09 ` [PATCH 14/27] acpi: Ignore acpi_rsdp kernel param when the kernel has been " Matthew Garrett
2019-03-25 22:09 ` [PATCH 15/27] acpi: Disable ACPI table override if the kernel is " Matthew Garrett
2019-03-25 22:09 ` [PATCH 16/27] acpi: Disable APEI error injection " Matthew Garrett
2019-03-25 22:09 ` [PATCH 17/27] Prohibit PCMCIA CIS storage when " Matthew Garrett
2019-03-25 22:09 ` [PATCH 18/27] Lock down TIOCSSERIAL Matthew Garrett
2019-03-25 22:09 ` [PATCH 19/27] Lock down module params that specify hardware parameters (eg. ioport) Matthew Garrett
2019-03-25 22:09 ` [PATCH 20/27] x86/mmiotrace: Lock down the testmmiotrace module Matthew Garrett
2019-03-25 23:35   ` Steven Rostedt
2019-03-25 22:09 ` [PATCH 21/27] Lock down /proc/kcore Matthew Garrett
2019-03-25 22:09 ` [PATCH 22/27] Lock down kprobes Matthew Garrett
2019-03-26 12:29   ` Masami Hiramatsu
2019-03-26 17:41     ` Matthew Garrett
2019-03-26 22:47       ` Masami Hiramatsu
2019-03-25 22:09 ` [PATCH 23/27] bpf: Restrict kernel image access functions when the kernel is locked down Matthew Garrett
2019-03-25 23:42   ` Stephen Hemminger
2019-03-25 23:59     ` Stephen Hemminger
2019-03-26  0:00     ` Daniel Borkmann
2019-03-26 13:54       ` Jordan Glover
2019-03-26  0:10     ` Andy Lutomirski
2019-03-26 18:57       ` James Morris [this message]
2019-03-26 19:22         ` Andy Lutomirski
2019-03-28  3:15           ` James Morris
2019-03-28 18:07             ` Matthew Garrett
2019-03-28 19:23               ` James Morris
2019-03-28 20:08                 ` Matthew Garrett
2019-03-26 20:19         ` Matthew Garrett
2019-03-25 22:09 ` [PATCH 24/27] Lock down perf Matthew Garrett
2019-03-25 22:09 ` [PATCH 25/27] debugfs: Restrict debugfs when the kernel is locked down Matthew Garrett
2019-03-26  0:31   ` Greg Kroah-Hartman
2019-03-26  0:38     ` Matthew Garrett
2019-03-26  0:43       ` Greg Kroah-Hartman
2019-03-25 22:09 ` [PATCH 26/27] lockdown: Print current->comm in restriction messages Matthew Garrett
2019-03-25 22:09 ` [PATCH 27/27] kexec: Allow kexec_file() with appropriate IMA policy when locked down Matthew Garrett
2019-03-26 15:33   ` Mimi Zohar

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