linux-kernel - Re: [PATCH v5 07/12] KEYS: Introduce link restriction to include builtin, secondary and machine keys

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Date:   Thu, 09 Sep 2021 14:19:53 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Eric Snowberg <eric.snowberg@...cle.com>
Cc:     keyrings@...r.kernel.org,
        linux-integrity <linux-integrity@...r.kernel.org>,
        David Howells <dhowells@...hat.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>, keescook@...omium.org,
        gregkh@...uxfoundation.org, torvalds@...ux-foundation.org,
        scott.branden@...adcom.com, weiyongjun1@...wei.com,
        nayna@...ux.ibm.com, ebiggers@...gle.com, ardb@...nel.org,
        nramas@...ux.microsoft.com, lszubowi@...hat.com,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        James.Bottomley@...senPartnership.com, pjones@...hat.com,
        "konrad.wilk@...cle.com" <konrad.wilk@...cle.com>
Subject: Re: [PATCH v5 07/12] KEYS: Introduce link restriction to include
 builtin, secondary and machine keys

On Thu, 2021-09-09 at 12:03 -0600, Eric Snowberg wrote:
> > On Sep 9, 2021, at 11:26 AM, Mimi Zohar <zohar@...ux.ibm.com> wrote:
> > 
> > Hi Eric,
> > 
> > The subject line above is too long.   According to
> > Documentation/process/submitting-patches.rst the "the ``summary`` must
> > be no more than 70-75 characters".
> > 
> > On Tue, 2021-09-07 at 12:01 -0400, Eric Snowberg wrote:
> >> Introduce a new link restriction that includes the trusted builtin,
> >> secondary and machine keys. The restriction is based on the key to be added
> >> being vouched for by a key in any of these three keyrings.
> >> 
> >> Suggested-by: Mimi Zohar <zohar@...ux.ibm.com>
> >> Signed-off-by: Eric Snowberg <eric.snowberg@...cle.com>
> >> ---
> >> v3: Initial version
> >> v4: moved code under CONFIG_INTEGRITY_MOK_KEYRING
> >> v5: Rename to machine keyring
> >> ---
> >> certs/system_keyring.c        | 23 +++++++++++++++++++++++
> >> include/keys/system_keyring.h |  6 ++++++
> >> 2 files changed, 29 insertions(+)
> >> 
> >> diff --git a/certs/system_keyring.c b/certs/system_keyring.c
> >> index 08ea542c8096..955bd57815f4 100644
> >> --- a/certs/system_keyring.c
> >> +++ b/certs/system_keyring.c
> >> @@ -99,6 +99,29 @@ void __init set_machine_trusted_keys(struct key *keyring)
> >> {
> >> 	machine_trusted_keys = keyring;
> >> }
> >> +
> >> +/**
> >> + * restrict_link_by_builtin_secondary_and_ca_trusted
> > 
> > Sorry for the patch churn.  With the keyring name change to ".machine",
> > the restriction name should also reflect this change.
> 
> Yes, I can change that. Should it be renamed to 
> restrict_link_by_builtin_secondary_and_machine_trusted? That seems a little
> long though.  Thanks.

The existing name is long too.  Not sure it makes much of a difference,
but dropping "and" and/or "trusted" might help.

Mimi