1 // SPDX-License-Identifier: GPL-2.0 2 3 /* Based on Christian Brauner's clone3() example */ 4 5 #define _GNU_SOURCE 6 #include <errno.h> 7 #include <inttypes.h> 8 #include <linux/types.h> 9 #include <linux/sched.h> 10 #include <stdint.h> 11 #include <stdio.h> 12 #include <stdlib.h> 13 #include <sys/syscall.h> 14 #include <sys/types.h> 15 #include <sys/un.h> 16 #include <sys/wait.h> 17 #include <unistd.h> 18 #include <sched.h> 19 20 #include "../kselftest.h" 21 #include "clone3_selftests.h" 22 23 enum test_mode { 24 CLONE3_ARGS_NO_TEST, 25 CLONE3_ARGS_ALL_0, 26 CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG, 27 CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG, 28 CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG, 29 CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG, 30 }; 31 32 static int call_clone3(uint64_t flags, size_t size, enum test_mode test_mode) 33 { 34 struct __clone_args args = { 35 .flags = flags, 36 .exit_signal = SIGCHLD, 37 }; 38 39 struct clone_args_extended { 40 struct __clone_args args; 41 __aligned_u64 excess_space[2]; 42 } args_ext; 43 44 pid_t pid = -1; 45 int status; 46 47 memset(&args_ext, 0, sizeof(args_ext)); 48 if (size > sizeof(struct __clone_args)) 49 args_ext.excess_space[1] = 1; 50 51 if (size == 0) 52 size = sizeof(struct __clone_args); 53 54 switch (test_mode) { 55 case CLONE3_ARGS_ALL_0: 56 args.flags = 0; 57 args.exit_signal = 0; 58 break; 59 case CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG: 60 args.exit_signal = 0xbadc0ded00000000ULL; 61 break; 62 case CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG: 63 args.exit_signal = 0x0000000080000000ULL; 64 break; 65 case CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG: 66 args.exit_signal = 0x0000000000000100ULL; 67 break; 68 case CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG: 69 args.exit_signal = 0x00000000000000f0ULL; 70 break; 71 } 72 73 memcpy(&args_ext.args, &args, sizeof(struct __clone_args)); 74 75 pid = sys_clone3((struct __clone_args *)&args_ext, size); 76 if (pid < 0) { 77 ksft_print_msg("%s - Failed to create new process\n", 78 strerror(errno)); 79 return -errno; 80 } 81 82 if (pid == 0) { 83 ksft_print_msg("I am the child, my PID is %d\n", getpid()); 84 _exit(EXIT_SUCCESS); 85 } 86 87 ksft_print_msg("I am the parent (%d). My child's pid is %d\n", 88 getpid(), pid); 89 90 if (waitpid(-1, &status, __WALL) < 0) { 91 ksft_print_msg("Child returned %s\n", strerror(errno)); 92 return -errno; 93 } 94 if (WEXITSTATUS(status)) 95 return WEXITSTATUS(status); 96 97 return 0; 98 } 99 100 static void test_clone3(uint64_t flags, size_t size, int expected, 101 enum test_mode test_mode) 102 { 103 int ret; 104 105 ksft_print_msg( 106 "[%d] Trying clone3() with flags %#" PRIx64 " (size %zu)\n", 107 getpid(), flags, size); 108 ret = call_clone3(flags, size, test_mode); 109 ksft_print_msg("[%d] clone3() with flags says: %d expected %d\n", 110 getpid(), ret, expected); 111 if (ret != expected) 112 ksft_test_result_fail( 113 "[%d] Result (%d) is different than expected (%d)\n", 114 getpid(), ret, expected); 115 else 116 ksft_test_result_pass( 117 "[%d] Result (%d) matches expectation (%d)\n", 118 getpid(), ret, expected); 119 } 120 121 int main(int argc, char *argv[]) 122 { 123 pid_t pid; 124 125 uid_t uid = getuid(); 126 127 ksft_print_header(); 128 ksft_set_plan(17); 129 test_clone3_supported(); 130 131 /* Just a simple clone3() should return 0.*/ 132 test_clone3(0, 0, 0, CLONE3_ARGS_NO_TEST); 133 134 /* Do a clone3() in a new PID NS.*/ 135 if (uid == 0) 136 test_clone3(CLONE_NEWPID, 0, 0, CLONE3_ARGS_NO_TEST); 137 else 138 ksft_test_result_skip("Skipping clone3() with CLONE_NEWPID\n"); 139 140 /* Do a clone3() with CLONE_ARGS_SIZE_VER0. */ 141 test_clone3(0, CLONE_ARGS_SIZE_VER0, 0, CLONE3_ARGS_NO_TEST); 142 143 /* Do a clone3() with CLONE_ARGS_SIZE_VER0 - 8 */ 144 test_clone3(0, CLONE_ARGS_SIZE_VER0 - 8, -EINVAL, CLONE3_ARGS_NO_TEST); 145 146 /* Do a clone3() with sizeof(struct clone_args) + 8 */ 147 test_clone3(0, sizeof(struct __clone_args) + 8, 0, CLONE3_ARGS_NO_TEST); 148 149 /* Do a clone3() with exit_signal having highest 32 bits non-zero */ 150 test_clone3(0, 0, -EINVAL, CLONE3_ARGS_INVAL_EXIT_SIGNAL_BIG); 151 152 /* Do a clone3() with negative 32-bit exit_signal */ 153 test_clone3(0, 0, -EINVAL, CLONE3_ARGS_INVAL_EXIT_SIGNAL_NEG); 154 155 /* Do a clone3() with exit_signal not fitting into CSIGNAL mask */ 156 test_clone3(0, 0, -EINVAL, CLONE3_ARGS_INVAL_EXIT_SIGNAL_CSIG); 157 158 /* Do a clone3() with NSIG < exit_signal < CSIG */ 159 test_clone3(0, 0, -EINVAL, CLONE3_ARGS_INVAL_EXIT_SIGNAL_NSIG); 160 161 test_clone3(0, sizeof(struct __clone_args) + 8, 0, CLONE3_ARGS_ALL_0); 162 163 test_clone3(0, sizeof(struct __clone_args) + 16, -E2BIG, 164 CLONE3_ARGS_ALL_0); 165 166 test_clone3(0, sizeof(struct __clone_args) * 2, -E2BIG, 167 CLONE3_ARGS_ALL_0); 168 169 /* Do a clone3() with > page size */ 170 test_clone3(0, getpagesize() + 8, -E2BIG, CLONE3_ARGS_NO_TEST); 171 172 /* Do a clone3() with CLONE_ARGS_SIZE_VER0 in a new PID NS. */ 173 if (uid == 0) 174 test_clone3(CLONE_NEWPID, CLONE_ARGS_SIZE_VER0, 0, 175 CLONE3_ARGS_NO_TEST); 176 else 177 ksft_test_result_skip("Skipping clone3() with CLONE_NEWPID\n"); 178 179 /* Do a clone3() with CLONE_ARGS_SIZE_VER0 - 8 in a new PID NS */ 180 test_clone3(CLONE_NEWPID, CLONE_ARGS_SIZE_VER0 - 8, -EINVAL, 181 CLONE3_ARGS_NO_TEST); 182 183 /* Do a clone3() with sizeof(struct clone_args) + 8 in a new PID NS */ 184 if (uid == 0) 185 test_clone3(CLONE_NEWPID, sizeof(struct __clone_args) + 8, 0, 186 CLONE3_ARGS_NO_TEST); 187 else 188 ksft_test_result_skip("Skipping clone3() with CLONE_NEWPID\n"); 189 190 /* Do a clone3() with > page size in a new PID NS */ 191 test_clone3(CLONE_NEWPID, getpagesize() + 8, -E2BIG, 192 CLONE3_ARGS_NO_TEST); 193 194 return !ksft_get_fail_cnt() ? ksft_exit_pass() : ksft_exit_fail(); 195 } 196