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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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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 CLONE_ARGS_SIZE_VER0
23#define CLONE_ARGS_SIZE_VER0 64
24#endif
25
26#ifndef __NR_clone3
27#define __NR_clone3 -1
28struct clone_args {
29 __aligned_u64 flags;
30 __aligned_u64 pidfd;
31 __aligned_u64 child_tid;
32 __aligned_u64 parent_tid;
33 __aligned_u64 exit_signal;
34 __aligned_u64 stack;
35 __aligned_u64 stack_size;
36 __aligned_u64 tls;
37#define CLONE_ARGS_SIZE_VER1 80
38 __aligned_u64 set_tid;
39 __aligned_u64 set_tid_size;
40#define CLONE_ARGS_SIZE_VER2 88
41 __aligned_u64 cgroup;
42};
43#endif /* __NR_clone3 */
44
45static pid_t sys_clone3(struct clone_args *args, size_t size)
46{
47 fflush(stdout);
48 fflush(stderr);
49 return syscall(__NR_clone3, args, size);
50}
51
52static inline void test_clone3_supported(void)
53{
54 pid_t pid;
55 struct clone_args args = {};
56
57 if (__NR_clone3 < 0)
58 ksft_exit_skip("clone3() syscall is not supported\n");
59
60 /* Set to something that will always cause EINVAL. */
61 args.exit_signal = -1;
62 pid = sys_clone3(&args, sizeof(args));
63 if (!pid)
64 exit(EXIT_SUCCESS);
65
66 if (pid > 0) {
67 wait(NULL);
68 ksft_exit_fail_msg(
69 "Managed to create child process with invalid exit_signal\n");
70 }
71
72 if (errno == ENOSYS)
73 ksft_exit_skip("clone3() syscall is not supported\n");
74
75 ksft_print_msg("clone3() syscall supported\n");
76}
77
78#endif /* _CLONE3_SELFTESTS_H */