linux-kernel - Re: [PATCH v14 04/10] KEYS: Move KEY_LOOKUP_ to include/linux/key.h and add flags check function

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Date:   Mon, 29 Aug 2022 15:33:34 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Roberto Sassu <roberto.sassu@...weicloud.com>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        martin.lau@...ux.dev, song@...nel.org, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, mykolal@...com,
        corbet@....net, dhowells@...hat.com, rostedt@...dmis.org,
        mingo@...hat.com, paul@...l-moore.com, jmorris@...ei.org,
        serge@...lyn.com, shuah@...nel.org, bpf@...r.kernel.org,
        linux-doc@...r.kernel.org, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        deso@...teo.net, Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH v14 04/10] KEYS: Move KEY_LOOKUP_ to include/linux/key.h
 and add flags check function

On Mon, Aug 29, 2022 at 09:25:05AM +0200, Roberto Sassu wrote:
> On Sun, 2022-08-28 at 07:03 +0300, Jarkko Sakkinen wrote:
> > On Sun, Aug 28, 2022 at 06:59:41AM +0300, Jarkko Sakkinen wrote:
> > > On Fri, Aug 26, 2022 at 11:22:54AM +0200, Roberto Sassu wrote:
> > > > On Fri, 2022-08-26 at 11:12 +0200, Roberto Sassu wrote:
> > > > > From: Roberto Sassu <roberto.sassu@...wei.com>
> > > > > 
> > > > > In preparation for the patch that introduces the
> > > > > bpf_lookup_user_key() eBPF
> > > > > kfunc, move KEY_LOOKUP_ definitions to include/linux/key.h, to
> > > > > be
> > > > > able to
> > > > > validate the kfunc parameters.
> > > > > 
> > > > > Also, introduce key_lookup_flags_valid() to check if the caller
> > > > > set
> > > > > in the
> > > > > argument only defined flags. Introduce it directly in
> > > > > include/linux/key.h,
> > > > > to reduce the risk that the check is not in sync with currently
> > > > > defined
> > > > > flags.
> > > > > 
> > > > > Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> > > > > Reviewed-by: KP Singh <kpsingh@...nel.org>
> > > > 
> > > > Jarkko, could you please ack it if it is fine?
> > > 
> > > So, as said I'm not really confident that a function is
> > > even needed in the first place. It's fine if there are
> > > enough call sites to make it legit.
> > 
> > And *if* a named constant is enough, you could probably
> > then just squash to the same patch that uses it, right?
> 
> Yes, the constant seems better. Maybe, I would add in the same patch
> that exports the lookup flags, since we have that.

Yeah, then it would be probably easier to review too
since it is "in the context".

BR, Jarkko