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

On Thu, Jun 11, 2026 at 04:03:15PM +0200, Andrea Cervesato wrote:
> From: Andrea Cervesato <andrea.cervesato-IBi9RG/[email protected]>
> 
> 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-IBi9RG/[email protected]>
> ---
>  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-IBi9RG/[email protected]>
> 
Reviewed-by: Wei Gao <wegao-IBi9RG/[email protected]>
> 
> -- 
> Mailing list info: https://lists.linux.it/listinfo/ltp

-- 
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