linux-kernel - Re: [PATCH v14 05/12] KEYS: Move KEY_LOOKUP_ to include/linux/key.h and set KEY_LOOKUP_FLAGS

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Message-ID: <YxF4H9MTDj+PnJ+V@kernel.org>
Date:   Fri, 2 Sep 2022 06:27:27 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Roberto Sassu <roberto.sassu@...weicloud.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Mykola Lysenko <mykolal@...com>,
        David Howells <dhowells@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Paul Moore <paul@...l-moore.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        Shuah Khan <shuah@...nel.org>, bpf <bpf@...r.kernel.org>,
        keyrings@...r.kernel.org,
        LSM List <linux-security-module@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Daniel Müller <deso@...teo.net>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH v14 05/12] KEYS: Move KEY_LOOKUP_ to include/linux/key.h
 and set KEY_LOOKUP_FLAGS_ALL

On Wed, Aug 31, 2022 at 08:33:38AM -0700, Alexei Starovoitov wrote:
> On Wed, Aug 31, 2022 at 2:24 AM Roberto Sassu
> <roberto.sassu@...weicloud.com> wrote:
> > > > >
> > > > > +#define KEY_LOOKUP_CREATE        0x01
> > > > > +#define KEY_LOOKUP_PARTIAL       0x02
> > > > > +#define KEY_LOOKUP_FLAGS_ALL     (KEY_LOOKUP_CREATE |
> > > > > KEY_LOOKUP_PARTIAL)
> > > >
> > > > IMHO this could be just KEY_LOOKUP_ALL.
> 
> Since this is supposed to be kernel internal flags
> please make them enum, so that bpf progs can auto-adjust
> (with the help of CORE) to changes in this enum.
> With #define there is no way for bpf prog to know
> when #define changed in the future kernels.

Isn't enum also Rust compatibility requirement, or do I remember
incorrectly? Anyway, good suggestion.

BR, Jarkko