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