[LTP] lib: add module is loaded check

[linuxtestproject.agent@gmail.com]

Hi Li,

On Mon Apr 13 15:25:17 2026 +0800, Li Wang <liwang@redhat.com> wrote:
> lib: add module is loaded check

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

> diff --git a/include/tst_module.h b/include/tst_module.h
> index e55321d19..9b789e289 100644
> --- 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);

New public library functions in include/ should have a kernel-doc
(/** ... */) comment describing @mod_name and Return:.

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

> diff --git a/testcases/cve/cve-2025-21756.c b/testcases/cve/cve-2025-21756.c
> index 4245a4c95..b49950045 100644
> --- a/testcases/cve/cve-2025-21756.c
> +++ b/testcases/cve/cve-2025-21756.c
> @@ -85,8 +95,15 @@ static void run(void)
>  }
>  
>  static struct tst_test test = {
> +	.needs_root = 1,
> +	.setup = setup,

The reason .needs_root = 1 is required (loading the vsock and
vsock_loopback modules before dropping privileges in setup()) should also
be documented in the test's /*\ ... */ doc comment.

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

> diff --git a/testcases/kernel/syscalls/keyctl/keyctl23.c b/testcases/kernel/syscalls/keyctl/keyctl23.c
> index cf90210d2..adfb1197a 100644
> --- a/testcases/kernel/syscalls/keyctl/keyctl23.c
> +++ b/testcases/kernel/syscalls/keyctl/keyctl23.c
> @@ -6,7 +6,8 @@
>  /*\
>   * 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.
>   *
>   * [Algorithm]
>   *
> @@ -89,8 +89,6 @@ static void setup(void)
>  {
>  	SAFE_KEYCTL(KEYCTL_JOIN_SESSION_KEYRING, 0, 0, 0, 0);
>  
> -	tst_modprobe("x509_key_parser", NULL);
> -
>  	ring_builtin = SAFE_NEW_RING("ltpkeyctl23_builtin");

keyctl23.c still has "CONFIG_X509_CERTIFICATE_PARSER=y" in .needs_kconfigs
instead of "CONFIG_X509_CERTIFICATE_PARSER", so tst_kconfig_check() aborts
with TCONF when the option is =m before tst_kconfig_module_load() is
called, and never loads a module when it is =y. Drop =y from
"CONFIG_X509_CERTIFICATE_PARSER=y" in .needs_kconfigs (matching keyctl29.c)
so CONFIG_X509_CERTIFICATE_PARSER=m is accepted and x509_key_parser is
loaded automatically.

Verdict - Needs revision

Pre-existing issues:
- testcases/cve/sctphantom.c: the doc comment at lines 46-48 still says the
  test reports TCONF if the sctp module is not loaded ("run modprobe sctp
  first"), and the sysctls saved via tst_sys_conf_save() in setup() could
  now use .save_restore in struct tst_test since do_setup() loads the module
  before .save_restore and do_cleanup() unloads it after
  tst_sys_conf_restore().

---
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