tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef _CLONE3_SELFTESTS_H
4#define _CLONE3_SELFTESTS_H
5
6#define _GNU_SOURCE
7#include <sched.h>
8#include <linux/sched.h>
9#include <linux/types.h>
10#include <stdint.h>
11#include <syscall.h>
12#include <sys/wait.h>
13
14#include "../kselftest.h"
15
16#define ptr_to_u64(ptr) ((__u64)((uintptr_t)(ptr)))
17
18#ifndef CLONE_INTO_CGROUP
19#define CLONE_INTO_CGROUP 0x200000000ULL /* Clone into a specific cgroup given the right permissions. */
20#endif
21
22#ifndef __NR_clone3
23#define __NR_clone3 -1
24#endif
25
26struct __clone_args {
27 __aligned_u64 flags;
28 __aligned_u64 pidfd;
29 __aligned_u64 child_tid;
30 __aligned_u64 parent_tid;
31 __aligned_u64 exit_signal;
32 __aligned_u64 stack;
33 __aligned_u64 stack_size;
34 __aligned_u64 tls;
35#ifndef CLONE_ARGS_SIZE_VER0
36#define CLONE_ARGS_SIZE_VER0 64 /* sizeof first published struct */
37#endif
38 __aligned_u64 set_tid;
39 __aligned_u64 set_tid_size;
40#ifndef CLONE_ARGS_SIZE_VER1
41#define CLONE_ARGS_SIZE_VER1 80 /* sizeof second published struct */
42#endif
43 __aligned_u64 cgroup;
44#ifndef CLONE_ARGS_SIZE_VER2
45#define CLONE_ARGS_SIZE_VER2 88 /* sizeof third published struct */
46#endif
47};
48
49static pid_t sys_clone3(struct __clone_args *args, size_t size)
50{
51 fflush(stdout);
52 fflush(stderr);
53 return syscall(__NR_clone3, args, size);
54}
55
56static inline void test_clone3_supported(void)
57{
58 pid_t pid;
59 struct __clone_args args = {};
60
61 if (__NR_clone3 < 0)
62 ksft_exit_skip("clone3() syscall is not supported\n");
63
64 /* Set to something that will always cause EINVAL. */
65 args.exit_signal = -1;
66 pid = sys_clone3(&args, sizeof(args));
67 if (!pid)
68 exit(EXIT_SUCCESS);
69
70 if (pid > 0) {
71 wait(NULL);
72 ksft_exit_fail_msg(
73 "Managed to create child process with invalid exit_signal\n");
74 }
75
76 if (errno == ENOSYS)
77 ksft_exit_skip("clone3() syscall is not supported\n");
78
79 ksft_print_msg("clone3() syscall supported\n");
80}
81
82#endif /* _CLONE3_SELFTESTS_H */