| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20250418000834.672343-1-herton@redhat.com>
Date: Thu, 17 Apr 2025 21:08:34 -0300
From: "Herton R. Krzesinski" <herton@...hat.com>
To: linux-modules@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
akpm@...ux-foundation.org,
mcgrof@...nel.org,
petr.pavlu@...e.com,
samitolvanen@...gle.com,
da.gomez@...sung.com,
herton@...hat.com
Subject: [PATCH] lib/test_kmod: do not hardcode/depend on any filesystem
Right now test_kmod has hardcoded dependencies on btrfs/xfs. That
is not optimal since you end up needing to select/build them, but it
is not really required since other fs could be selected for the testing.
Also, we can't change the default/driver module used for testing on
initialization.
Thus make it more generic: introduce two module parameters (start_driver
and start_test_fs), which allow to select which modules/fs to use for
the testing on test_kmod initialization. Then it's up to the user to
select which modules/fs to use for testing based on his config. However,
keep test_module as required default.
This way, config/modules becomes selectable as when the testing is done
from selftests (userspace).
While at it, also change trigger_config_run_type, since at module
initialization we already set the defaults at __kmod_config_init and
should not need to do it again in test_kmod_init(), thus we can
avoid to again set test_driver/test_fs.
Signed-off-by: Herton R. Krzesinski <herton@...hat.com>
---
lib/Kconfig.debug | 6 -----
lib/test_kmod.c | 64 +++++++++++++++++++++++++----------------------
2 files changed, 34 insertions(+), 36 deletions(-)
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 9fe4d8dfe578..1e0f8cbf0365 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2983,13 +2983,7 @@ config TEST_DYNAMIC_DEBUG
config TEST_KMOD
tristate "kmod stress tester"
depends on m
- depends on NETDEVICES && NET_CORE && INET # for TUN
- depends on BLOCK
- depends on PAGE_SIZE_LESS_THAN_256KB # for BTRFS
select TEST_LKM
- select XFS_FS
- select TUN
- select BTRFS_FS
help
Test the kernel's module loading mechanism: kmod. kmod implements
support to load modules using the Linux kernel's usermode helper.
diff --git a/lib/test_kmod.c b/lib/test_kmod.c
index 064ed0fce75a..f0dd092860ea 100644
--- a/lib/test_kmod.c
+++ b/lib/test_kmod.c
@@ -28,14 +28,20 @@
#define TEST_START_NUM_THREADS 50
#define TEST_START_DRIVER "test_module"
-#define TEST_START_TEST_FS "xfs"
#define TEST_START_TEST_CASE TEST_KMOD_DRIVER
-
static bool force_init_test = false;
-module_param(force_init_test, bool_enable_only, 0644);
+module_param(force_init_test, bool_enable_only, 0444);
MODULE_PARM_DESC(force_init_test,
"Force kicking a test immediately after driver loads");
+static char *start_driver;
+module_param(start_driver, charp, 0444);
+MODULE_PARM_DESC(start_driver,
+ "Module/driver to use for the testing after driver loads");
+static char *start_test_fs;
+module_param(start_test_fs, charp, 0444);
+MODULE_PARM_DESC(start_test_fs,
+ "File system to use for the testing after driver loads");
/*
* For device allocation / registration
@@ -508,6 +514,11 @@ static int __trigger_config_run(struct kmod_test_device *test_dev)
case TEST_KMOD_DRIVER:
return run_test_driver(test_dev);
case TEST_KMOD_FS_TYPE:
+ if (!config->test_fs) {
+ dev_warn(test_dev->dev,
+ "No fs type specified, can't run the test\n");
+ return -EINVAL;
+ }
return run_test_fs_type(test_dev);
default:
dev_warn(test_dev->dev,
@@ -721,26 +732,20 @@ static ssize_t config_test_fs_show(struct device *dev,
static DEVICE_ATTR_RW(config_test_fs);
static int trigger_config_run_type(struct kmod_test_device *test_dev,
- enum kmod_test_case test_case,
- const char *test_str)
+ enum kmod_test_case test_case)
{
- int copied = 0;
struct test_config *config = &test_dev->config;
mutex_lock(&test_dev->config_mutex);
switch (test_case) {
case TEST_KMOD_DRIVER:
- kfree_const(config->test_driver);
- config->test_driver = NULL;
- copied = config_copy_test_driver_name(config, test_str,
- strlen(test_str));
break;
case TEST_KMOD_FS_TYPE:
- kfree_const(config->test_fs);
- config->test_fs = NULL;
- copied = config_copy_test_fs(config, test_str,
- strlen(test_str));
+ if (!config->test_fs) {
+ mutex_unlock(&test_dev->config_mutex);
+ return 0;
+ }
break;
default:
mutex_unlock(&test_dev->config_mutex);
@@ -751,11 +756,6 @@ static int trigger_config_run_type(struct kmod_test_device *test_dev,
mutex_unlock(&test_dev->config_mutex);
- if (copied <= 0 || copied != strlen(test_str)) {
- test_dev->test_is_oom = true;
- return -ENOMEM;
- }
-
test_dev->test_is_oom = false;
return trigger_config_run(test_dev);
@@ -800,19 +800,24 @@ static unsigned int kmod_init_test_thread_limit(void)
static int __kmod_config_init(struct kmod_test_device *test_dev)
{
struct test_config *config = &test_dev->config;
+ const char *test_start_driver = start_driver ? start_driver :
+ TEST_START_DRIVER;
int ret = -ENOMEM, copied;
__kmod_config_free(config);
- copied = config_copy_test_driver_name(config, TEST_START_DRIVER,
- strlen(TEST_START_DRIVER));
- if (copied != strlen(TEST_START_DRIVER))
+ copied = config_copy_test_driver_name(config, test_start_driver,
+ strlen(test_start_driver));
+ if (copied != strlen(test_start_driver))
goto err_out;
- copied = config_copy_test_fs(config, TEST_START_TEST_FS,
- strlen(TEST_START_TEST_FS));
- if (copied != strlen(TEST_START_TEST_FS))
- goto err_out;
+
+ if (start_test_fs) {
+ copied = config_copy_test_fs(config, start_test_fs,
+ strlen(start_test_fs));
+ if (copied != strlen(start_test_fs))
+ goto err_out;
+ }
config->num_threads = kmod_init_test_thread_limit();
config->test_result = 0;
@@ -1178,12 +1183,11 @@ static int __init test_kmod_init(void)
* lowering the init level for more fun.
*/
if (force_init_test) {
- ret = trigger_config_run_type(test_dev,
- TEST_KMOD_DRIVER, "tun");
+ ret = trigger_config_run_type(test_dev, TEST_KMOD_DRIVER);
if (WARN_ON(ret))
return ret;
- ret = trigger_config_run_type(test_dev,
- TEST_KMOD_FS_TYPE, "btrfs");
+
+ ret = trigger_config_run_type(test_dev, TEST_KMOD_FS_TYPE);
if (WARN_ON(ret))
return ret;
}
--
2.47.1
Powered by blists - more mailing lists