linux-kernel - Re: [PATCH v15 05/12] KEYS: Move KEY_LOOKUP_ to include/linux/key.h and define KEY_LOOKUP

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Date:   Thu, 01 Sep 2022 09:00:00 +0200
From:   Roberto Sassu <roberto.sassu@...weicloud.com>
To:     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,
        dhowells@...hat.com, jarkko@...nel.org, rostedt@...dmis.org,
        mingo@...hat.com, paul@...l-moore.com, jmorris@...ei.org,
        serge@...lyn.com, shuah@...nel.org
Cc:     bpf@...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, memxor@...il.com,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: Re: [PATCH v15 05/12] KEYS: Move KEY_LOOKUP_ to include/linux/key.h
 and define KEY_LOOKUP_ALL

On Wed, 2022-08-31 at 18:54 +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. Add them to enum key_lookup_flag, so
> that
> all the current ones and the ones defined in the future are
> automatically
> exported through BTF and available to eBPF programs.
> 
> Also, add KEY_LOOKUP_ALL to the enum, to facilitate checking whether
> a
> variable contains only defined flags.
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
> Reviewed-by: KP Singh <kpsingh@...nel.org>
> Acked-by: Jarkko Sakkinen <jarkko@...nel.org>

Jarkko, I kept your ack although the code slightly changed to use the
enum instead of #define.

If you have more comments/suggestions, please let me know.

Thanks

Roberto

> ---
>  include/linux/key.h      | 6 ++++++
>  security/keys/internal.h | 2 --
>  2 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/key.h b/include/linux/key.h
> index 7febc4881363..d84171f90cbd 100644
> --- a/include/linux/key.h
> +++ b/include/linux/key.h
> @@ -88,6 +88,12 @@ enum key_need_perm {
>  	KEY_DEFER_PERM_CHECK,	/* Special: permission check is
> deferred */
>  };
>  
> +enum key_lookup_flag {
> +	KEY_LOOKUP_CREATE = 0x01,	/* Create special keyrings if they
> don't exist */
> +	KEY_LOOKUP_PARTIAL = 0x02,	/* Permit partially
> constructed keys to be found */
> +	KEY_LOOKUP_ALL = (KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL), /*
> OR of previous flags */
> +};
> +
>  struct seq_file;
>  struct user_struct;
>  struct signal_struct;
> diff --git a/security/keys/internal.h b/security/keys/internal.h
> index 9b9cf3b6fcbb..3c1e7122076b 100644
> --- a/security/keys/internal.h
> +++ b/security/keys/internal.h
> @@ -165,8 +165,6 @@ extern struct key *request_key_and_link(struct
> key_type *type,
>  
>  extern bool lookup_user_key_possessed(const struct key *key,
>  				      const struct key_match_data
> *match_data);
> -#define KEY_LOOKUP_CREATE	0x01
> -#define KEY_LOOKUP_PARTIAL	0x02
>  
>  extern long join_session_keyring(const char *name);
>  extern void key_change_session_keyring(struct callback_head *twork);