| 1 | /* |
| 2 | * miscellaneous BSD system call shims |
| 3 | * |
| 4 | * Copyright (c) 2013 Stacey D. Son |
| 5 | * |
| 6 | * SPDX-License-Identifier: GPL-2.0-or-later |
| 7 | */ |
| 8 | |
| 9 | #ifndef BSD_MISC_H |
| 10 | #define BSD_MISC_H |
| 11 | |
| 12 | #include <sys/types.h> |
| 13 | #include <sys/ipc.h> |
| 14 | #include <sys/msg.h> |
| 15 | #include <sys/sem.h> |
| 16 | #include <sys/uuid.h> |
| 17 | |
| 18 | #include "qemu-bsd.h" |
| 19 | |
| 20 | static int bsd_msgmax; |
| 21 | |
| 22 | /* quotactl(2) */ |
| 23 | static inline abi_long do_bsd_quotactl(abi_ulong path, abi_long cmd, |
| 24 | __unused abi_ulong target_addr) |
| 25 | { |
| 26 | qemu_log("qemu: Unsupported syscall quotactl()\n"); |
| 27 | return -TARGET_ENOSYS; |
| 28 | } |
| 29 | |
| 30 | /* reboot(2) */ |
| 31 | static inline abi_long do_bsd_reboot(abi_long how) |
| 32 | { |
| 33 | qemu_log("qemu: Unsupported syscall reboot()\n"); |
| 34 | return -TARGET_ENOSYS; |
| 35 | } |
| 36 | |
| 37 | /* uuidgen(2) */ |
| 38 | static inline abi_long do_bsd_uuidgen(abi_ulong target_addr, int count) |
| 39 | { |
| 40 | int i; |
| 41 | abi_long ret; |
| 42 | g_autofree struct uuid *host_uuid = NULL; |
| 43 | |
| 44 | /* |
| 45 | * 2048 is the kernel limit, but there's no #define for it, nor any sysctl |
| 46 | * to query it. |
| 47 | */ |
| 48 | if (count < 1 || count > 2048) { |
| 49 | return -TARGET_EINVAL; |
| 50 | } |
| 51 | |
| 52 | host_uuid = g_malloc(count * sizeof(struct uuid)); |
| 53 | |
| 54 | ret = get_errno(uuidgen(host_uuid, count)); |
| 55 | if (is_error(ret)) { |
| 56 | goto out; |
| 57 | } |
| 58 | for (i = 0; i < count; i++) { |
| 59 | ret = host_to_target_uuid(target_addr + |
| 60 | (abi_ulong)(sizeof(struct target_uuid) * i), &host_uuid[i]); |
| 61 | if (is_error(ret)) { |
| 62 | break; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | out: |
| 67 | return ret; |
| 68 | } |
| 69 | |
| 70 | /* |
| 71 | * System V Semaphores |
| 72 | */ |
| 73 | |
| 74 | /* semget(2) */ |
| 75 | static inline abi_long do_bsd_semget(abi_long key, int nsems, |
| 76 | int target_flags) |
| 77 | { |
| 78 | return get_errno(semget(key, nsems, |
| 79 | target_to_host_bitmask(target_flags, ipc_flags_tbl))); |
| 80 | } |
| 81 | |
| 82 | /* semop(2) */ |
| 83 | static inline abi_long do_bsd_semop(int semid, abi_long ptr, unsigned nsops) |
| 84 | { |
| 85 | g_autofree struct sembuf *sops = g_malloc(nsops * sizeof(struct sembuf)); |
| 86 | struct target_sembuf *target_sembuf; |
| 87 | int i; |
| 88 | |
| 89 | target_sembuf = lock_user(VERIFY_READ, ptr, |
| 90 | nsops * sizeof(struct target_sembuf), 1); |
| 91 | if (target_sembuf == NULL) { |
| 92 | return -TARGET_EFAULT; |
| 93 | } |
| 94 | for (i = 0; i < nsops; i++) { |
| 95 | __get_user(sops[i].sem_num, &target_sembuf[i].sem_num); |
| 96 | __get_user(sops[i].sem_op, &target_sembuf[i].sem_op); |
| 97 | __get_user(sops[i].sem_flg, &target_sembuf[i].sem_flg); |
| 98 | } |
| 99 | unlock_user(target_sembuf, ptr, 0); |
| 100 | |
| 101 | return semop(semid, sops, nsops); |
| 102 | } |
| 103 | |
| 104 | /* __semctl(2) */ |
| 105 | static inline abi_long do_bsd___semctl(int semid, int semnum, int target_cmd, |
| 106 | abi_ptr un_ptr) |
| 107 | { |
| 108 | void *target_un; |
| 109 | union semun arg; |
| 110 | struct semid_ds dsarg; |
| 111 | unsigned short *array = NULL; |
| 112 | int host_cmd; |
| 113 | abi_long ret = 0; |
| 114 | abi_ulong target_array, target_buffer; |
| 115 | |
| 116 | switch (target_cmd) { |
| 117 | case TARGET_GETVAL: |
| 118 | host_cmd = GETVAL; |
| 119 | break; |
| 120 | |
| 121 | case TARGET_SETVAL: |
| 122 | host_cmd = SETVAL; |
| 123 | break; |
| 124 | |
| 125 | case TARGET_GETALL: |
| 126 | host_cmd = GETALL; |
| 127 | break; |
| 128 | |
| 129 | case TARGET_SETALL: |
| 130 | host_cmd = SETALL; |
| 131 | break; |
| 132 | |
| 133 | case TARGET_IPC_STAT: |
| 134 | host_cmd = IPC_STAT; |
| 135 | break; |
| 136 | |
| 137 | case TARGET_IPC_SET: |
| 138 | host_cmd = IPC_SET; |
| 139 | break; |
| 140 | |
| 141 | case TARGET_IPC_RMID: |
| 142 | host_cmd = IPC_RMID; |
| 143 | break; |
| 144 | |
| 145 | case TARGET_GETPID: |
| 146 | host_cmd = GETPID; |
| 147 | break; |
| 148 | |
| 149 | case TARGET_GETNCNT: |
| 150 | host_cmd = GETNCNT; |
| 151 | break; |
| 152 | |
| 153 | case TARGET_GETZCNT: |
| 154 | host_cmd = GETZCNT; |
| 155 | break; |
| 156 | |
| 157 | default: |
| 158 | return -TARGET_EINVAL; |
| 159 | } |
| 160 | |
| 161 | /* |
| 162 | * Unlike Linux and the semctl system call, we take a pointer |
| 163 | * to the union arg here. |
| 164 | */ |
| 165 | target_un = lock_user(VERIFY_READ, un_ptr, sizeof(union target_semun), 1); |
| 166 | |
| 167 | switch (host_cmd) { |
| 168 | case GETVAL: |
| 169 | case SETVAL: |
| 170 | __get_user(arg.val, (abi_int *)target_un); |
| 171 | ret = get_errno(semctl(semid, semnum, host_cmd, arg)); |
| 172 | break; |
| 173 | |
| 174 | case GETALL: |
| 175 | case SETALL: |
| 176 | __get_user(target_array, (abi_ulong *)target_un); |
| 177 | ret = target_to_host_semarray(semid, &array, target_array); |
| 178 | if (is_error(ret)) { |
| 179 | goto out; |
| 180 | } |
| 181 | arg.array = array; |
| 182 | ret = get_errno(semctl(semid, semnum, host_cmd, arg)); |
| 183 | if (!is_error(ret)) { |
| 184 | ret = host_to_target_semarray(semid, target_array, &array); |
| 185 | } |
| 186 | break; |
| 187 | |
| 188 | case IPC_STAT: |
| 189 | case IPC_SET: |
| 190 | __get_user(target_buffer, (abi_ulong *)target_un); |
| 191 | ret = target_to_host_semid_ds(&dsarg, target_buffer); |
| 192 | if (is_error(ret)) { |
| 193 | goto out; |
| 194 | } |
| 195 | arg.buf = &dsarg; |
| 196 | ret = get_errno(semctl(semid, semnum, host_cmd, arg)); |
| 197 | if (!is_error(ret)) { |
| 198 | ret = host_to_target_semid_ds(target_buffer, &dsarg); |
| 199 | } |
| 200 | break; |
| 201 | |
| 202 | case IPC_RMID: |
| 203 | case GETPID: |
| 204 | case GETNCNT: |
| 205 | case GETZCNT: |
| 206 | ret = get_errno(semctl(semid, semnum, host_cmd, NULL)); |
| 207 | break; |
| 208 | |
| 209 | default: |
| 210 | ret = -TARGET_EINVAL; |
| 211 | break; |
| 212 | } |
| 213 | out: |
| 214 | unlock_user(target_un, un_ptr, 1); |
| 215 | return ret; |
| 216 | } |
| 217 | |
| 218 | /* msgctl(2) */ |
| 219 | static inline abi_long do_bsd_msgctl(int msgid, int target_cmd, abi_long ptr) |
| 220 | { |
| 221 | struct msqid_ds dsarg; |
| 222 | abi_long ret = -TARGET_EINVAL; |
| 223 | int host_cmd; |
| 224 | |
| 225 | switch (target_cmd) { |
| 226 | case TARGET_IPC_STAT: |
| 227 | host_cmd = IPC_STAT; |
| 228 | break; |
| 229 | |
| 230 | case TARGET_IPC_SET: |
| 231 | host_cmd = IPC_SET; |
| 232 | break; |
| 233 | |
| 234 | case TARGET_IPC_RMID: |
| 235 | host_cmd = IPC_RMID; |
| 236 | break; |
| 237 | |
| 238 | default: |
| 239 | return -TARGET_EINVAL; |
| 240 | } |
| 241 | |
| 242 | switch (host_cmd) { |
| 243 | case IPC_STAT: |
| 244 | case IPC_SET: |
| 245 | if (target_to_host_msqid_ds(&dsarg, ptr)) { |
| 246 | return -TARGET_EFAULT; |
| 247 | } |
| 248 | ret = get_errno(msgctl(msgid, host_cmd, &dsarg)); |
| 249 | if (host_to_target_msqid_ds(ptr, &dsarg)) { |
| 250 | return -TARGET_EFAULT; |
| 251 | } |
| 252 | break; |
| 253 | |
| 254 | case IPC_RMID: |
| 255 | ret = get_errno(msgctl(msgid, host_cmd, NULL)); |
| 256 | break; |
| 257 | |
| 258 | default: |
| 259 | ret = -TARGET_EINVAL; |
| 260 | break; |
| 261 | } |
| 262 | return ret; |
| 263 | } |
| 264 | |
| 265 | struct kern_mymsg { |
| 266 | long mtype; |
| 267 | char mtext[1]; |
| 268 | }; |
| 269 | |
| 270 | static inline abi_long bsd_validate_msgsz(abi_ulong msgsz) |
| 271 | { |
| 272 | /* Fetch msgmax the first time we need it. */ |
| 273 | if (bsd_msgmax == 0) { |
| 274 | size_t len = sizeof(bsd_msgmax); |
| 275 | |
| 276 | if (sysctlbyname("kern.ipc.msgmax", &bsd_msgmax, &len, NULL, 0) == -1) { |
| 277 | return -TARGET_EINVAL; |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | if (msgsz > bsd_msgmax) { |
| 282 | return -TARGET_EINVAL; |
| 283 | } |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | /* msgsnd(2) */ |
| 288 | static inline abi_long do_bsd_msgsnd(int msqid, abi_long msgp, |
| 289 | abi_ulong msgsz, int msgflg) |
| 290 | { |
| 291 | struct target_msgbuf *target_mb; |
| 292 | struct kern_mymsg *host_mb; |
| 293 | abi_long ret; |
| 294 | |
| 295 | ret = bsd_validate_msgsz(msgsz); |
| 296 | if (is_error(ret)) { |
| 297 | return ret; |
| 298 | } |
| 299 | if (!lock_user_struct(VERIFY_READ, target_mb, msgp, 0)) { |
| 300 | return -TARGET_EFAULT; |
| 301 | } |
| 302 | host_mb = g_malloc(msgsz + sizeof(long)); |
| 303 | host_mb->mtype = (abi_long) tswapal(target_mb->mtype); |
| 304 | memcpy(host_mb->mtext, target_mb->mtext, msgsz); |
| 305 | ret = get_errno(msgsnd(msqid, host_mb, msgsz, msgflg)); |
| 306 | g_free(host_mb); |
| 307 | unlock_user_struct(target_mb, msgp, 0); |
| 308 | |
| 309 | return ret; |
| 310 | } |
| 311 | |
| 312 | /* msgget(2) */ |
| 313 | static inline abi_long do_bsd_msgget(abi_long key, abi_long msgflag) |
| 314 | { |
| 315 | abi_long ret; |
| 316 | |
| 317 | ret = get_errno(msgget(key, msgflag)); |
| 318 | return ret; |
| 319 | } |
| 320 | |
| 321 | /* msgrcv(2) */ |
| 322 | static inline abi_long do_bsd_msgrcv(int msqid, abi_long msgp, |
| 323 | abi_ulong msgsz, abi_long msgtyp, int msgflg) |
| 324 | { |
| 325 | struct target_msgbuf *target_mb = NULL; |
| 326 | char *target_mtext; |
| 327 | struct kern_mymsg *host_mb; |
| 328 | abi_long ret = 0; |
| 329 | |
| 330 | ret = bsd_validate_msgsz(msgsz); |
| 331 | if (is_error(ret)) { |
| 332 | return ret; |
| 333 | } |
| 334 | if (!lock_user_struct(VERIFY_WRITE, target_mb, msgp, 0)) { |
| 335 | return -TARGET_EFAULT; |
| 336 | } |
| 337 | host_mb = g_malloc(msgsz + sizeof(long)); |
| 338 | ret = get_errno(msgrcv(msqid, host_mb, msgsz, tswapal(msgtyp), msgflg)); |
| 339 | if (ret > 0) { |
| 340 | abi_ulong target_mtext_addr = msgp + sizeof(abi_ulong); |
| 341 | target_mtext = lock_user(VERIFY_WRITE, target_mtext_addr, ret, 0); |
| 342 | if (target_mtext == NULL) { |
| 343 | ret = -TARGET_EFAULT; |
| 344 | goto end; |
| 345 | } |
| 346 | memcpy(target_mb->mtext, host_mb->mtext, ret); |
| 347 | unlock_user(target_mtext, target_mtext_addr, ret); |
| 348 | } |
| 349 | if (!is_error(ret)) { |
| 350 | target_mb->mtype = tswapal(host_mb->mtype); |
| 351 | } |
| 352 | end: |
| 353 | if (target_mb != NULL) { |
| 354 | unlock_user_struct(target_mb, msgp, 1); |
| 355 | } |
| 356 | g_free(host_mb); |
| 357 | return ret; |
| 358 | } |
| 359 | |
| 360 | /* getdtablesize(2) */ |
| 361 | static inline abi_long do_bsd_getdtablesize(void) |
| 362 | { |
| 363 | return get_errno(getdtablesize()); |
| 364 | } |
| 365 | |
| 366 | #endif /* BSD_MISC_H */ |