[LTP] lib: add module is loaded check

[linuxtestproject.agent@gmail.com]

Hi Li,

On Mon Nov 2 10:43:25 2026 +0800, Li Wang (Hieco) <li.wang@linux.dev> wrote:
> lib: add module is loaded check

--- [PATCH 1/4] ---

> --- a/include/tst_module.h
> +++ b/include/tst_module.h
> @@ -49,5 +49,6 @@ static inline void tst_requires_module_signature_disabled(void)
>  
>  void tst_modprobe(const char *mod_name, char *const argv[]);
>  void tst_module_reload(const char *mod_name, char *const argv[]);
> +bool tst_module_is_loaded(const char *mod_name);

Add a kernel-doc comment (/** ... */) for tst_module_is_loaded() documenting
@mod_name and Return:.

--- [PATCH 2/4] ---

> +static void kconfig_module_record(struct tst_kconfig_var *var)
> +{
> +	unsigned int i;
> +	const char *mod = NULL;
> +
> +	if (var->choice != 'm')
> +		return;
> +
> +	for (i = 0; config_module_maps[i].config; i++) {
> +		if (!strcmp(config_module_maps[i].config, var->id)) {
> +			mod = config_module_maps[i].module_name;
> +			break;
> +		}
> +	}
> +
> +	if (!mod)
> +		return;
> +
> +	if (tst_module_is_loaded(mod))
> +		return;
> +
> +	for (i = 0; i < loaded_module_count; i++) {
> +		if (!strcmp(loaded_modules[i], mod))
> +			return;
> +	}
> +
> +	if (loaded_module_count < MAX_LOADED_MODULES)
> +		loaded_modules[loaded_module_count++] = mod;
> +}

Recording modules into loaded_modules[] inside kconfig_parse_line() happens
even when geteuid() != 0, when tst_kconfig_check() fails with TCONF (e.g.
CONFIG_X509_CERTIFICATE_PARSER=y on a =m kernel), or when tst_kconfig_read()
is called later during the test. Consequently, tst_kconfig_module_unload() in
do_cleanup() attempts to unload modules that were never loaded by
tst_kconfig_module_load(), and fails with EPERM (emitting a spurious TWARN)
when running unprivileged (such as vsock01). Only record modules in the
unload list when tst_kconfig_module_load() actually loads them.

> +		default:
> +			tst_res(TWARN, "Failed to unload module '%s'", name);
> +		}

Use TWARN | TERRNO so the failure reason from delete_module() is printed.

--- [PATCH 3/4] ---

>  static struct tst_test test = {
> +	.needs_root = 1,
> +	.setup = setup,
>  	.test_all = run,

Document why root is required (loading the vsock/vsock_loopback modules) in
the top-level /*\ ... */ test description block.

--- [PATCH 4/4] ---

>  /*\
>   * Test ``KEYCTL_RESTRICT_KEYRING`` builtin_trusted of :manpage:`keyctl(2)`.
>   *
> - * Requires root (CAP_SYS_MODULE) to load the ``x509_key_parser`` module.
> + * * Requires root (CAP_SYS_MODULE) so that the test library can load the
> + * ``x509_key_parser`` module.

Remove the extra asterisk in "* * Requires root", which creates a malformed
reST bullet item. Also update .needs_kconfigs in keyctl23.c from
"CONFIG_X509_CERTIFICATE_PARSER=y" to "CONFIG_X509_CERTIFICATE_PARSER",
otherwise tst_kconfig_check() aborts with TCONF on =m kernels instead of
loading x509_key_parser.

Verdict - Needs revision

---
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LTP AI Reviewer