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 __NR_clone3
19 #define __NR_clone3 -1
20 #endif
21
22 struct __clone_args {
23 __aligned_u64 flags;
24 __aligned_u64 pidfd;
25 __aligned_u64 child_tid;
26 __aligned_u64 parent_tid;
27 __aligned_u64 exit_signal;
28 __aligned_u64 stack;
29 __aligned_u64 stack_size;
30 __aligned_u64 tls;
31 __aligned_u64 set_tid;
32 __aligned_u64 set_tid_size;
33 __aligned_u64 cgroup;
34 };
35
36 static pid_t sys_clone3(struct __clone_args *args, size_t size)
37 {
38 fflush(stdout);
39 fflush(stderr);
40 return syscall(__NR_clone3, args, size);
41 }
42
43 static inline void test_clone3_supported(void)
44 {
45 pid_t pid;
46 struct __clone_args args = {};
47
48 if (__NR_clone3 < 0)
49 ksft_exit_skip("clone3() syscall is not supported\n");
50
51 /* Set to something that will always cause EINVAL. */
52 args.exit_signal = -1;
53 pid = sys_clone3(&args, sizeof(args));
54 if (!pid)
55 exit(EXIT_SUCCESS);
56
57 if (pid > 0) {
58 wait(NULL);
59 ksft_exit_fail_msg(
60 "Managed to create child process with invalid exit_signal\n");
61 }
62
63 if (errno == ENOSYS)
64 ksft_exit_skip("clone3() syscall is not supported\n");
65
66 ksft_print_msg("clone3() syscall supported\n");
67 }
68
69 #endif /* _CLONE3_SELFTESTS_H */
70
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