[LTP] [PATCH v1 2/2] cgroup_core02: copy from kernel selftest test_cgcore_lesser_ns_open

[Richard Palethorpe]

Hello,

Yang Xu <xuyang2018.jy@fujitsu.com> writes:

> Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
> ---
>  runtest/controllers                           |   1 +
>  .../kernel/controllers/cgroup/.gitignore      |   1 +
>  .../kernel/controllers/cgroup/cgroup_core02.c | 129 ++++++++++++++++++
>  3 files changed, 131 insertions(+)
>  create mode 100644 testcases/kernel/controllers/cgroup/cgroup_core02.c
>
> diff --git a/runtest/controllers b/runtest/controllers
> index 41f8367e4..8d1b936bf 100644
> --- a/runtest/controllers
> +++ b/runtest/controllers
> @@ -1,5 +1,6 @@
>  #DESCRIPTION:Resource Management testing
>  cgroup_core01	cgroup_core01
> +cgroup_core02	cgroup_core02
>  cgroup		cgroup_regression_test.sh
>  memcg_regression	memcg_regression_test.sh
>  memcg_test_3	memcg_test_3
> diff --git a/testcases/kernel/controllers/cgroup/.gitignore b/testcases/kernel/controllers/cgroup/.gitignore
> index 382f2d9f2..012aedcca 100644
> --- a/testcases/kernel/controllers/cgroup/.gitignore
> +++ b/testcases/kernel/controllers/cgroup/.gitignore
> @@ -2,3 +2,4 @@
>  /cgroup_regression_getdelays
>  /cgroup_regression_6_2
>  /cgroup_core01
> +/cgroup_core02
> diff --git a/testcases/kernel/controllers/cgroup/cgroup_core02.c b/testcases/kernel/controllers/cgroup/cgroup_core02.c
> new file mode 100644
> index 000000000..0dff71eea
> --- /dev/null
> +++ b/testcases/kernel/controllers/cgroup/cgroup_core02.c
> @@ -0,0 +1,129 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (c) 2022 FUJITSU LIMITED. All rights reserved.
> + * Author: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
> + */
> +
> +/*\
> + * [Description]
> + *
> + * When a task is writing to an fd opened by a different task, the perm check
> + * should use the cgroup namespace of the latter task.
> + *
> + * It is copy from kernel selftests cgroup test_core test_cgcore_lesser_ns_open
> + * subcase. Note that this case only runs on cgroup2 as cgroup1 doesn't have
> + * namespace support.
> + *
> + * It is a regression test for
> + *
> + * commit e57457641613fef0d147ede8bd6a3047df588b95
> + * Author: Tejun Heo <tj@kernel.org>
> + * Date:   Thu Jan 6 11:02:29 2022 -1000
> + *
> + * cgroup: Use open-time cgroup namespace for process migration perm checks
> + */
> +
> +#define _GNU_SOURCE
> +#include <sched.h>
> +#include <stdlib.h>
> +#include <stdio.h>
> +#include <sys/types.h>
> +#include <pwd.h>
> +#include "tst_test.h"
> +#include "tst_safe_file_at.h"
> +
> +static struct tst_cg_group *cg_child_a, *cg_child_b;
> +static uid_t nobody_uid;
> +
> +struct lesser_ns_open_thread_arg {
> +	int fds[TST_CG_ROOTS_MAX];
> +	int loops;
> +};
> +
> +static int lesser_ns_open_thread_fn(void *arg)
> +{
> +	struct lesser_ns_open_thread_arg *targ = arg;
> +
> +	targ->loops = SAFE_CG_OPEN(cg_child_b, "cgroup.procs", O_RDWR, targ->fds);
> +	return 0;
> +}
> +
> +static void test_lesser_ns_open(void)
> +{
> +	int i;
> +	static char stack[65536];
> +	pid_t pid;
> +	int status;
> +	struct lesser_ns_open_thread_arg targ = { .fds = {0}, .loops = -1};
> +
> +	cg_child_a = tst_cg_group_mk(tst_cg, "child_a");
> +	cg_child_b = tst_cg_group_mk(tst_cg, "child_b");
> +
> +	if (!SAFE_FORK()) {
> +		SAFE_CG_PRINT(cg_child_a, "cgroup.procs", "0");
> +		SAFE_CG_FCHOWN(cg_child_a, "cgroup.procs",  nobody_uid, -1);
> +		SAFE_CG_FCHOWN(cg_child_b, "cgroup.procs",  nobody_uid, -1);
> +		pid  = ltp_clone(CLONE_NEWCGROUP | CLONE_FILES | CLONE_VM | SIGCHLD,
> +					lesser_ns_open_thread_fn, &targ,
> 65536, stack);

FYI, I would like to replace this with tst_clone.

However merged, thanks!

-- 
Thank you,
Richard.