linux-kernel - Re: [PATCH v2 1/2] landlock: Extend documentation for kernel support

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Message-ID: <Zfl5oT1amymvxjjL@debian>
Date: Tue, 19 Mar 2024 12:40:17 +0100
From: Alejandro Colomar <alx@...nel.org>
To: Mickaël Salaün <mic@...ikod.net>
Cc: Günther Noack <gnoack@...gle.com>,
	Paul Moore <paul@...l-moore.com>,
	"Serge E . Hallyn" <serge@...lyn.com>,
	Konstantin Meskhidze <konstantin.meskhidze@...wei.com>,
	Shervin Oloumi <enlightened@...omium.org>,
	linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v2 1/2] landlock: Extend documentation for kernel support

Hi Mickaël!

On Tue, Mar 19, 2024 at 11:46:34AM +0100, Mickaël Salaün wrote:
> On Mon, Mar 18, 2024 at 10:50:42AM +0100, Alejandro Colomar wrote:
> > Hi Mickaël, Günther,
> > 
> > Sorry for the delay!
> > 
> > On Thu, Mar 07, 2024 at 11:21:57AM +0100, Mickaël Salaün wrote:
> > > CCing Alejandro
> > > 
> > > On Tue, Feb 27, 2024 at 05:32:20PM +0100, Günther Noack wrote:
> > > > On Tue, Feb 27, 2024 at 12:05:49PM +0100, Mickaël Salaün wrote:
> > > > > Extend the kernel support section with one subsection for build time
> > > > > configuration and another for boot time configuration.
> > > > > 
> > > > > Extend the boot time subsection with a concrete example.
> > > > > 
> > > > > Update the journalctl command to include the boot option.
> > > > > 
> > > > > Cc: Günther Noack <gnoack@...gle.com>
> > > > > Cc: Kees Cook <keescook@...omium.org>
> > > > > Signed-off-by: Mickaël Salaün <mic@...ikod.net>
> > > > > ---
> > > > > 
> > > > > Changes since v1:
> > > > > * New patch, suggested by Kees Cook.
> > > > > ---
> > > > >  Documentation/userspace-api/landlock.rst | 57 +++++++++++++++++++++---
> > > > >  1 file changed, 51 insertions(+), 6 deletions(-)
> > 
> > [...]
> > 
> > > > > +
> > > > > +  lsm=landlock,lockdown,yama,integrity,apparmor
> > > > > +
> > > > > +After a reboot, we can check that Landlock is up and running by looking at
> > > > > +kernel logs:
> > > > > +
> > > > > +.. code-block:: console
> > > > > +
> > > > > +    # dmesg | grep landlock || journalctl -kb -g landlock
> > > > > +    [    0.000000] Command line: [...] lsm=landlock,lockdown,yama,integrity,apparmor
> > > > > +    [    0.000000] Kernel command line: [...] lsm=landlock,lockdown,yama,integrity,apparmor
> > > > > +    [    0.000000] LSM: initializing lsm=lockdown,capability,landlock,yama,integrity,apparmor
> > > > > +    [    0.000000] landlock: Up and running.
> > > > > +
> > > > > +Note that according to the built time kernel configuration,
> > > > 
> > > > s/built time/build time/
> > > >                  ^
> > > 
> > > OK
> > 
> > Here, this should actually be "build-time" since it works as an
> > adjective.
> 
> Thanks Alex but this was already merged:
> https://git.kernel.org/torvalds/c/35e886e88c803920644c9d3abb45a9ecb7f1e761
> 
> Because I picked Günther's below suggestion, it should be good right?

Yeah, it's a minor grammar mistake that is widespread elsewhere.  If you
want to patch it, go ahead, if you want to keep it until next time you
revise this text, it's not something that will significantly hurt the
understanding of the text.

See also: <https://www.grammar-monster.com/lessons/hyphens_in_compound_adjectives.htm>

Have a lovely day!
Alex

> 
> > 
> > > 
> > > > 
> > > > It feels like the phrase "according to" could be slightly more specific here.
> > > > 
> > > > To paraphrase Alejandro Colomar, "Note that" is usually redundant.
> > > > https://lore.kernel.org/all/0aafcdd6-4ac7-8501-c607-9a24a98597d7@gmail.com/
> > > > 
> > > > I'd suggest:
> > > > 
> > > >   The kernel may be configured at build time to always load the ``lockdown`` and
> > > >   ``capability`` LSMs.  In that case, these LSMs will appear at the beginning of
> > > >   the ``LSM: initializing`` log line as well, even if they are not configured in
> > > >   the boot loader.
> > 
> > LGTM
> > 
> > > 
> > > OK, I integrated your suggestion.  I guess `capability` is not really
> > > considered an LSM but it would be too confusing and out of scope for an
> > > user documentation to explain that.
> > > 
> > > > 
> > > > > +``lockdown,capability,`` may always stay at the beginning of the ``LSM:
> > > > > +initializing lsm=`` list even if they are not configured with the bootloader,
> > > > 
> > > > Nit: The man pages spell this in two words as "boot loader".
> > > 
> > > OK, I'll use "boot loader" too.
> > > 
> > > > 
> > > > 
> > > > > +which is OK.
> > > > > +
> > > > > +Network support
> > > > > +---------------
> > > > > +
> > > > >  To be able to explicitly allow TCP operations (e.g., adding a network rule with
> > > > >  ``LANDLOCK_ACCESS_NET_BIND_TCP``), the kernel must support TCP
> > > > >  (``CONFIG_INET=y``).  Otherwise, sys_landlock_add_rule() returns an
> > > > > 
> > > > > base-commit: b4007fd27206c478a4b76e299bddf4a71787f520
> > > > > -- 
> > > > > 2.44.0
> > > > > 
> > > > 
> > > > Reviewed-by: Günther Noack <gnoack@...gle.com>
> > > 
> > > Thanks!
> > 
> > Reviewed-by: Alejandro Colomar <alx@...nel.org>
> > 
> > Have a lovely day!
> > Alex
> > 
> > -- 
> > <https://www.alejandro-colomar.es/>
> > Looking for a remote C programming job at the moment.
> 
> 

-- 
<https://www.alejandro-colomar.es/>
Looking for a remote C programming job at the moment.

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