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test_sysclt: Test for registering a mount point

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Test that target gets created by register_sysctl_mount_point and that no
additional target can be created "on top" of a permanently empty sysctl
table.

Create a mount point target (mnt) in the sysctl test driver; try to
create another on top of that (mnt_error). Output an error if
"mnt_error" is present when we run the sysctl selftests.

Signed-off-by: Joel Granados <j.granados@samsung.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
This commit is contained in:
Joel Granados
2023-06-16 10:59:20 +02:00
committed by Luis Chamberlain
parent ec866cc6f8
commit f2e7a6265e
2 changed files with 55 additions and 6 deletions
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45
lib/test_sysctl.c
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@@ -30,6 +30,13 @@ static int i_zero;
static int i_one_hundred = 100;
static int match_int_ok = 1;
static struct {
struct ctl_table_header *test_h_setup_node;
struct ctl_table_header *test_h_mnt;
struct ctl_table_header *test_h_mnterror;
} sysctl_test_headers;
struct test_sysctl_data {
int int_0001;
int int_0002;
@@ -153,16 +160,14 @@ static void test_sysctl_calc_match_int_ok(void)
match_int_ok = 0;
}
static struct ctl_table_header *test_sysctl_header;
static int test_sysctl_setup_node_tests(void)
{
test_sysctl_calc_match_int_ok();
test_data.bitmap_0001 = kzalloc(SYSCTL_TEST_BITMAP_SIZE/8, GFP_KERNEL);
if (!test_data.bitmap_0001)
return -ENOMEM;
test_sysctl_header = register_sysctl("debug/test_sysctl", test_table);
if (!test_sysctl_header) {
sysctl_test_headers.test_h_setup_node = register_sysctl("debug/test_sysctl", test_table);
if (!sysctl_test_headers.test_h_setup_node) {
kfree(test_data.bitmap_0001);
return -ENOMEM;
}
@@ -195,6 +200,26 @@ static int test_sysctl_run_unregister_nested(void)
return 0;
}
static int test_sysctl_run_register_mount_point(void)
{
sysctl_test_headers.test_h_mnt
= register_sysctl_mount_point("debug/test_sysctl/mnt");
if (!sysctl_test_headers.test_h_mnt)
return -ENOMEM;
sysctl_test_headers.test_h_mnterror
= register_sysctl("debug/test_sysctl/mnt/mnt_error",
test_table_unregister);
/*
* Don't check the result.:
* If it fails (expected behavior), return 0.
* If successful (missbehavior of register mount point), we want to see
* mnt_error when we run the sysctl test script
*/
return 0;
}
static int __init test_sysctl_init(void)
{
int err;
@@ -204,6 +229,10 @@ static int __init test_sysctl_init(void)
goto out;
err = test_sysctl_run_unregister_nested();
if (err)
goto out;
err = test_sysctl_run_register_mount_point();
out:
return err;
@@ -213,8 +242,12 @@ module_init(test_sysctl_init);
static void __exit test_sysctl_exit(void)
{
kfree(test_data.bitmap_0001);
if (test_sysctl_header)
unregister_sysctl_table(test_sysctl_header);
if (sysctl_test_headers.test_h_setup_node)
unregister_sysctl_table(sysctl_test_headers.test_h_setup_node);
if (sysctl_test_headers.test_h_mnt)
unregister_sysctl_table(sysctl_test_headers.test_h_mnt);
if (sysctl_test_headers.test_h_mnterror)
unregister_sysctl_table(sysctl_test_headers.test_h_mnterror);
}
module_exit(test_sysctl_exit);