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 28 struct 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 45 static 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 52 static 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 */ 79