[PATCH v35 24/29] LSM: Add a function to report multiple LSMs

[John Johansen]

On 4/18/22 07:59, Casey Schaufler wrote:
> Add a new boolean function lsm_multiple_contexts() to
> identify when multiple security modules provide security
> context strings.
> 
> Signed-off-by: Casey Schaufler <casey at schaufler-ca.com>

Reviewed-by: John Johansen <john.johansen at canonical.com>

> ---
>  include/linux/security.h | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/include/linux/security.h b/include/linux/security.h
> index 2150016492be..3fab84220f88 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -232,6 +232,15 @@ static inline bool lsmblob_equal(const struct lsmblob *bloba,
>  extern int lsm_name_to_slot(char *name);
>  extern const char *lsm_slot_to_name(int slot);
>  
> +static inline bool lsm_multiple_contexts(void)
> +{
> +#ifdef CONFIG_SECURITY
> +	return lsm_slot_to_name(1) != NULL;
> +#else
> +	return false;
> +#endif
> +}
> +
>  /**
>   * lsmblob_value - find the first non-zero value in an lsmblob structure.
>   * @blob: Pointer to the data