On 2023/10/17 4:35, Marco Pagani wrote:
> Commit 2810c1e99867 ("kunit: Fix wild-memory-access bug in
> kunit_free_suite_set()") is causing all test suites to run (when
> built as modules) while still in MODULE_STATE_COMING. In that state,
> test modules are not fully initialized and lack sysfs kobjects.
> This behavior can cause a crash if the test module tries to register
> fake devices.
>
> This patch restores the normal execution flow, waiting for the module
> initialization to complete before running the test suites.
> The issue reported in the commit mentioned above is addressed using
> virt_addr_valid() to detect if the module loading has failed
> and mod->kunit_suites has not been allocated using kmalloc_array().
>
> Fixes: 2810c1e99867 ("kunit: Fix wild-memory-access bug in kunit_free_suite_set()")
> Signed-off-by: Marco Pagani <marpagan@xxxxxxxxxx>
> ---
> lib/kunit/test.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/lib/kunit/test.c b/lib/kunit/test.c
> index 421f13981412..1a49569186fc 100644
> --- a/lib/kunit/test.c
> +++ b/lib/kunit/test.c
> @@ -769,12 +769,14 @@ static void kunit_module_exit(struct module *mod)
> };
> const char *action = kunit_action();
>
> + if (!suite_set.start || !virt_addr_valid(suite_set.start))
> + return;
> +
> if (!action)
> __kunit_test_suites_exit(mod->kunit_suites,
> mod->num_kunit_suites);
If the module state is from MODULE_STATE_LIVE to MODULE_STATE_GOING, in
kunit_module_init() the kunit_exec_run_tests() is executed when action
is NULL whether kunit_filter_suites() succeeds or not. But in
kunit_module_exit() __kunit_test_suites_exit() will not be executed when
action is NULL if kunit_filter_suites() fails.
>
> - if (suite_set.start)
> - kunit_free_suite_set(suite_set);
> + kunit_free_suite_set(suite_set);
> }
>
> static int kunit_module_notify(struct notifier_block *nb, unsigned long val,
> @@ -784,12 +786,12 @@ static int kunit_module_notify(struct notifier_block *nb, unsigned long val,
>
> switch (val) {
> case MODULE_STATE_LIVE:
> + kunit_module_init(mod);
> break;
> case MODULE_STATE_GOING:
> kunit_module_exit(mod);
> break;
> case MODULE_STATE_COMING:
> - kunit_module_init(mod);
> break;
> case MODULE_STATE_UNFORMED:
> break;
