[LTP] [PATCH] clone11: skip CLONE_NEWCGROUP on kernels < 4.6

[Andrea Cervesato]

From: Andrea Cervesato <andrea.cervesato@suse.com>

CLONE_NEWCGROUP was added in kernel v4.6. On older kernels such as
v4.4, the flag is unknown and clone() returns EINVAL instead of the
expected EPERM, causing a spurious test failure.

Add a per-test-case minimum kernel version check so that the
CLONE_NEWCGROUP case reports TCONF on kernels older than 4.6.

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 testcases/kernel/syscalls/clone/clone11.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/testcases/kernel/syscalls/clone/clone11.c b/testcases/kernel/syscalls/clone/clone11.c
index 028da778158de6867a71ac3974f9c2263481d3a3..607e42585fad41784be9104be01f504218559342 100644
--- a/testcases/kernel/syscalls/clone/clone11.c
+++ b/testcases/kernel/syscalls/clone/clone11.c
@@ -21,9 +21,10 @@ static int *child_pid;
 static struct tcase {
 	uint64_t flags;
 	const char *sflags;
+	int min_kver[3];
 } tcases[] = {
 	{ DESC(CLONE_NEWPID) },
-	{ DESC(CLONE_NEWCGROUP) },
+	{ DESC(CLONE_NEWCGROUP), .min_kver = {4, 6, 0} },
 	{ DESC(CLONE_NEWIPC) },
 	{ DESC(CLONE_NEWNET) },
 	{ DESC(CLONE_NEWNS) },
@@ -40,6 +41,13 @@ static void run(unsigned int n)
 {
 	struct tcase *tc = &tcases[n];
 
+	if (tc->min_kver[0] &&
+	    tst_kvercmp(tc->min_kver[0], tc->min_kver[1], tc->min_kver[2]) < 0) {
+		tst_res(TCONF, "clone(%s) needs kernel %d.%d+",
+			tc->sflags, tc->min_kver[0], tc->min_kver[1]);
+		return;
+	}
+
 	TST_EXP_FAIL(ltp_clone(tc->flags, child_fn, NULL, CHILD_STACK_SIZE, child_stack),
 		EPERM, "clone(%s) should fail with EPERM",
 		tc->sflags);

---
base-commit: a375e8deed471723f5a0114c56eb48fe6f6f45d3
change-id: 20260611-fix_clone11_min_kver-394cf499c2c7

Best regards,
-- 
Andrea Cervesato <andrea.cervesato@suse.com>