[PATCH v15 05/12] KEYS: Move KEY_LOOKUP_ to include/linux/key.h and define KEY_LOOKUP_ALL

[Roberto Sassu]

On Wed, 2022-08-31 at 18:54 +0200, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu at huawei.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 at huawei.com>
> Reviewed-by: KP Singh <kpsingh at kernel.org>
> Acked-by: Jarkko Sakkinen <jarkko at kernel.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);