tjh.dev
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 __NR_clone3
19#define __NR_clone3 435
20#endif
21
22struct __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
36static 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
43static 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 */