[RFC PATCH v2 21/34] lsm: output available LSMs when debugging

[Casey Schaufler]

On 7/21/2025 4:21 PM, Paul Moore wrote:
> This will display all of the LSMs built into the kernel, regardless
> of if they are enabled or not.
>
> Signed-off-by: Paul Moore <paul at paul-moore.com>

Reviewed-by: Casey Schaufler <casey at schaufler-ca.com>


> ---
>  security/lsm_init.c | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/security/lsm_init.c b/security/lsm_init.c
> index 0a8e4c725055..7e794f4515ea 100644
> --- a/security/lsm_init.c
> +++ b/security/lsm_init.c
> @@ -360,6 +360,8 @@ int __init early_security_init(void)
>  {
>  	struct lsm_info *lsm;
>  
> +	/* NOTE: lsm_pr_dbg() doesn't work here as lsm_debug is not yet set */
> +
>  	lsm_early_for_each_raw(lsm) {
>  		lsm_enabled_set(lsm, true);
>  		lsm_order_append(lsm, "early");
> @@ -382,9 +384,24 @@ int __init security_init(void)
>  	struct lsm_info **lsm;
>  
>  	if (lsm_debug) {
> -		lsm_pr("built-in LSM list: %s\n", lsm_order_builtin);
> +		struct lsm_info *i;
> +
> +		cnt = 0;
> +		lsm_pr("available LSMs: ");
> +		lsm_early_for_each_raw(i)
> +			lsm_pr_cont("%s%s(E)", (cnt++ ? "," : ""), i->id->name);
> +		lsm_for_each_raw(i)
> +			lsm_pr_cont("%s%s", (cnt++ ? "," : ""), i->id->name);
> +		lsm_pr_cont("\n");
> +
> +		lsm_pr("built-in LSM config: %s\n", lsm_order_builtin);
> +
>  		lsm_pr("legacy LSM parameter: %s\n", lsm_order_legacy);
>  		lsm_pr("boot LSM parameter: %s\n", lsm_order_cmdline);
> +
> +		/* see the note about lsm_pr_dbg() in early_security_init() */
> +		lsm_early_for_each_raw(i)
> +			lsm_pr("enabled LSM early:%s\n", i->id->name);
>  	}
>  
>  	if (lsm_order_cmdline) {