1 /* 2 * linux/kernel/compat.c 3 * 4 * Kernel compatibililty routines for e.g. 32 bit syscall support 5 * on 64 bit kernels. 6 * 7 * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/linkage.h> 15 #include <linux/compat.h> 16 #include <linux/errno.h> 17 #include <linux/time.h> 18 #include <linux/signal.h> 19 #include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */ 20 #include <linux/syscalls.h> 21 #include <linux/unistd.h> 22 #include <linux/security.h> 23 #include <linux/timex.h> 24 #include <linux/export.h> 25 #include <linux/migrate.h> 26 #include <linux/posix-timers.h> 27 #include <linux/times.h> 28 #include <linux/ptrace.h> 29 #include <linux/gfp.h> 30 31 #include <linux/uaccess.h> 32 33 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp) 34 { 35 memset(txc, 0, sizeof(struct timex)); 36 37 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || 38 __get_user(txc->modes, &utp->modes) || 39 __get_user(txc->offset, &utp->offset) || 40 __get_user(txc->freq, &utp->freq) || 41 __get_user(txc->maxerror, &utp->maxerror) || 42 __get_user(txc->esterror, &utp->esterror) || 43 __get_user(txc->status, &utp->status) || 44 __get_user(txc->constant, &utp->constant) || 45 __get_user(txc->precision, &utp->precision) || 46 __get_user(txc->tolerance, &utp->tolerance) || 47 __get_user(txc->time.tv_sec, &utp->time.tv_sec) || 48 __get_user(txc->time.tv_usec, &utp->time.tv_usec) || 49 __get_user(txc->tick, &utp->tick) || 50 __get_user(txc->ppsfreq, &utp->ppsfreq) || 51 __get_user(txc->jitter, &utp->jitter) || 52 __get_user(txc->shift, &utp->shift) || 53 __get_user(txc->stabil, &utp->stabil) || 54 __get_user(txc->jitcnt, &utp->jitcnt) || 55 __get_user(txc->calcnt, &utp->calcnt) || 56 __get_user(txc->errcnt, &utp->errcnt) || 57 __get_user(txc->stbcnt, &utp->stbcnt)) 58 return -EFAULT; 59 60 return 0; 61 } 62 63 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc) 64 { 65 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || 66 __put_user(txc->modes, &utp->modes) || 67 __put_user(txc->offset, &utp->offset) || 68 __put_user(txc->freq, &utp->freq) || 69 __put_user(txc->maxerror, &utp->maxerror) || 70 __put_user(txc->esterror, &utp->esterror) || 71 __put_user(txc->status, &utp->status) || 72 __put_user(txc->constant, &utp->constant) || 73 __put_user(txc->precision, &utp->precision) || 74 __put_user(txc->tolerance, &utp->tolerance) || 75 __put_user(txc->time.tv_sec, &utp->time.tv_sec) || 76 __put_user(txc->time.tv_usec, &utp->time.tv_usec) || 77 __put_user(txc->tick, &utp->tick) || 78 __put_user(txc->ppsfreq, &utp->ppsfreq) || 79 __put_user(txc->jitter, &utp->jitter) || 80 __put_user(txc->shift, &utp->shift) || 81 __put_user(txc->stabil, &utp->stabil) || 82 __put_user(txc->jitcnt, &utp->jitcnt) || 83 __put_user(txc->calcnt, &utp->calcnt) || 84 __put_user(txc->errcnt, &utp->errcnt) || 85 __put_user(txc->stbcnt, &utp->stbcnt) || 86 __put_user(txc->tai, &utp->tai)) 87 return -EFAULT; 88 return 0; 89 } 90 91 COMPAT_SYSCALL_DEFINE2(gettimeofday, struct compat_timeval __user *, tv, 92 struct timezone __user *, tz) 93 { 94 if (tv) { 95 struct timeval ktv; 96 do_gettimeofday(&ktv); 97 if (compat_put_timeval(&ktv, tv)) 98 return -EFAULT; 99 } 100 if (tz) { 101 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) 102 return -EFAULT; 103 } 104 105 return 0; 106 } 107 108 COMPAT_SYSCALL_DEFINE2(settimeofday, struct compat_timeval __user *, tv, 109 struct timezone __user *, tz) 110 { 111 struct timeval user_tv; 112 struct timespec new_ts; 113 struct timezone new_tz; 114 115 if (tv) { 116 if (compat_get_timeval(&user_tv, tv)) 117 return -EFAULT; 118 new_ts.tv_sec = user_tv.tv_sec; 119 new_ts.tv_nsec = user_tv.tv_usec * NSEC_PER_USEC; 120 } 121 if (tz) { 122 if (copy_from_user(&new_tz, tz, sizeof(*tz))) 123 return -EFAULT; 124 } 125 126 return do_sys_settimeofday(tv ? &new_ts : NULL, tz ? &new_tz : NULL); 127 } 128 129 static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv) 130 { 131 return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) || 132 __get_user(tv->tv_sec, &ctv->tv_sec) || 133 __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; 134 } 135 136 static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv) 137 { 138 return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) || 139 __put_user(tv->tv_sec, &ctv->tv_sec) || 140 __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; 141 } 142 143 static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts) 144 { 145 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || 146 __get_user(ts->tv_sec, &cts->tv_sec) || 147 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 148 } 149 150 static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts) 151 { 152 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || 153 __put_user(ts->tv_sec, &cts->tv_sec) || 154 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 155 } 156 157 int compat_get_timeval(struct timeval *tv, const void __user *utv) 158 { 159 if (COMPAT_USE_64BIT_TIME) 160 return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0; 161 else 162 return __compat_get_timeval(tv, utv); 163 } 164 EXPORT_SYMBOL_GPL(compat_get_timeval); 165 166 int compat_put_timeval(const struct timeval *tv, void __user *utv) 167 { 168 if (COMPAT_USE_64BIT_TIME) 169 return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0; 170 else 171 return __compat_put_timeval(tv, utv); 172 } 173 EXPORT_SYMBOL_GPL(compat_put_timeval); 174 175 int compat_get_timespec(struct timespec *ts, const void __user *uts) 176 { 177 if (COMPAT_USE_64BIT_TIME) 178 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0; 179 else 180 return __compat_get_timespec(ts, uts); 181 } 182 EXPORT_SYMBOL_GPL(compat_get_timespec); 183 184 int compat_put_timespec(const struct timespec *ts, void __user *uts) 185 { 186 if (COMPAT_USE_64BIT_TIME) 187 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0; 188 else 189 return __compat_put_timespec(ts, uts); 190 } 191 EXPORT_SYMBOL_GPL(compat_put_timespec); 192 193 int compat_convert_timespec(struct timespec __user **kts, 194 const void __user *cts) 195 { 196 struct timespec ts; 197 struct timespec __user *uts; 198 199 if (!cts || COMPAT_USE_64BIT_TIME) { 200 *kts = (struct timespec __user *)cts; 201 return 0; 202 } 203 204 uts = compat_alloc_user_space(sizeof(ts)); 205 if (!uts) 206 return -EFAULT; 207 if (compat_get_timespec(&ts, cts)) 208 return -EFAULT; 209 if (copy_to_user(uts, &ts, sizeof(ts))) 210 return -EFAULT; 211 212 *kts = uts; 213 return 0; 214 } 215 216 static long compat_nanosleep_restart(struct restart_block *restart) 217 { 218 struct compat_timespec __user *rmtp; 219 struct timespec rmt; 220 mm_segment_t oldfs; 221 long ret; 222 223 restart->nanosleep.rmtp = (struct timespec __user *) &rmt; 224 oldfs = get_fs(); 225 set_fs(KERNEL_DS); 226 ret = hrtimer_nanosleep_restart(restart); 227 set_fs(oldfs); 228 229 if (ret == -ERESTART_RESTARTBLOCK) { 230 rmtp = restart->nanosleep.compat_rmtp; 231 232 if (rmtp && compat_put_timespec(&rmt, rmtp)) 233 return -EFAULT; 234 } 235 236 return ret; 237 } 238 239 COMPAT_SYSCALL_DEFINE2(nanosleep, struct compat_timespec __user *, rqtp, 240 struct compat_timespec __user *, rmtp) 241 { 242 struct timespec tu, rmt; 243 mm_segment_t oldfs; 244 long ret; 245 246 if (compat_get_timespec(&tu, rqtp)) 247 return -EFAULT; 248 249 if (!timespec_valid(&tu)) 250 return -EINVAL; 251 252 oldfs = get_fs(); 253 set_fs(KERNEL_DS); 254 ret = hrtimer_nanosleep(&tu, 255 rmtp ? (struct timespec __user *)&rmt : NULL, 256 HRTIMER_MODE_REL, CLOCK_MONOTONIC); 257 set_fs(oldfs); 258 259 /* 260 * hrtimer_nanosleep() can only return 0 or 261 * -ERESTART_RESTARTBLOCK here because: 262 * 263 * - we call it with HRTIMER_MODE_REL and therefor exclude the 264 * -ERESTARTNOHAND return path. 265 * 266 * - we supply the rmtp argument from the task stack (due to 267 * the necessary compat conversion. So the update cannot 268 * fail, which excludes the -EFAULT return path as well. If 269 * it fails nevertheless we have a bigger problem and wont 270 * reach this place anymore. 271 * 272 * - if the return value is 0, we do not have to update rmtp 273 * because there is no remaining time. 274 * 275 * We check for -ERESTART_RESTARTBLOCK nevertheless if the 276 * core implementation decides to return random nonsense. 277 */ 278 if (ret == -ERESTART_RESTARTBLOCK) { 279 struct restart_block *restart = ¤t->restart_block; 280 281 restart->fn = compat_nanosleep_restart; 282 restart->nanosleep.compat_rmtp = rmtp; 283 284 if (rmtp && compat_put_timespec(&rmt, rmtp)) 285 return -EFAULT; 286 } 287 return ret; 288 } 289 290 static inline long get_compat_itimerval(struct itimerval *o, 291 struct compat_itimerval __user *i) 292 { 293 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 294 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 295 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 296 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 297 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 298 } 299 300 static inline long put_compat_itimerval(struct compat_itimerval __user *o, 301 struct itimerval *i) 302 { 303 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 304 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 305 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 306 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 307 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 308 } 309 310 asmlinkage long sys_ni_posix_timers(void); 311 312 COMPAT_SYSCALL_DEFINE2(getitimer, int, which, 313 struct compat_itimerval __user *, it) 314 { 315 struct itimerval kit; 316 int error; 317 318 if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) 319 return sys_ni_posix_timers(); 320 321 error = do_getitimer(which, &kit); 322 if (!error && put_compat_itimerval(it, &kit)) 323 error = -EFAULT; 324 return error; 325 } 326 327 COMPAT_SYSCALL_DEFINE3(setitimer, int, which, 328 struct compat_itimerval __user *, in, 329 struct compat_itimerval __user *, out) 330 { 331 struct itimerval kin, kout; 332 int error; 333 334 if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) 335 return sys_ni_posix_timers(); 336 337 if (in) { 338 if (get_compat_itimerval(&kin, in)) 339 return -EFAULT; 340 } else 341 memset(&kin, 0, sizeof(kin)); 342 343 error = do_setitimer(which, &kin, out ? &kout : NULL); 344 if (error || !out) 345 return error; 346 if (put_compat_itimerval(out, &kout)) 347 return -EFAULT; 348 return 0; 349 } 350 351 static compat_clock_t clock_t_to_compat_clock_t(clock_t x) 352 { 353 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); 354 } 355 356 COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf) 357 { 358 if (tbuf) { 359 struct tms tms; 360 struct compat_tms tmp; 361 362 do_sys_times(&tms); 363 /* Convert our struct tms to the compat version. */ 364 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); 365 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); 366 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); 367 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); 368 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 369 return -EFAULT; 370 } 371 force_successful_syscall_return(); 372 return compat_jiffies_to_clock_t(jiffies); 373 } 374 375 #ifdef __ARCH_WANT_SYS_SIGPENDING 376 377 /* 378 * Assumption: old_sigset_t and compat_old_sigset_t are both 379 * types that can be passed to put_user()/get_user(). 380 */ 381 382 COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set) 383 { 384 old_sigset_t s; 385 long ret; 386 mm_segment_t old_fs = get_fs(); 387 388 set_fs(KERNEL_DS); 389 ret = sys_sigpending((old_sigset_t __user *) &s); 390 set_fs(old_fs); 391 if (ret == 0) 392 ret = put_user(s, set); 393 return ret; 394 } 395 396 #endif 397 398 #ifdef __ARCH_WANT_SYS_SIGPROCMASK 399 400 /* 401 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the 402 * blocked set of signals to the supplied signal set 403 */ 404 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set) 405 { 406 memcpy(blocked->sig, &set, sizeof(set)); 407 } 408 409 COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how, 410 compat_old_sigset_t __user *, nset, 411 compat_old_sigset_t __user *, oset) 412 { 413 old_sigset_t old_set, new_set; 414 sigset_t new_blocked; 415 416 old_set = current->blocked.sig[0]; 417 418 if (nset) { 419 if (get_user(new_set, nset)) 420 return -EFAULT; 421 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP)); 422 423 new_blocked = current->blocked; 424 425 switch (how) { 426 case SIG_BLOCK: 427 sigaddsetmask(&new_blocked, new_set); 428 break; 429 case SIG_UNBLOCK: 430 sigdelsetmask(&new_blocked, new_set); 431 break; 432 case SIG_SETMASK: 433 compat_sig_setmask(&new_blocked, new_set); 434 break; 435 default: 436 return -EINVAL; 437 } 438 439 set_current_blocked(&new_blocked); 440 } 441 442 if (oset) { 443 if (put_user(old_set, oset)) 444 return -EFAULT; 445 } 446 447 return 0; 448 } 449 450 #endif 451 452 COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource, 453 struct compat_rlimit __user *, rlim) 454 { 455 struct rlimit r; 456 457 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 458 __get_user(r.rlim_cur, &rlim->rlim_cur) || 459 __get_user(r.rlim_max, &rlim->rlim_max)) 460 return -EFAULT; 461 462 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 463 r.rlim_cur = RLIM_INFINITY; 464 if (r.rlim_max == COMPAT_RLIM_INFINITY) 465 r.rlim_max = RLIM_INFINITY; 466 return do_prlimit(current, resource, &r, NULL); 467 } 468 469 #ifdef COMPAT_RLIM_OLD_INFINITY 470 471 COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, 472 struct compat_rlimit __user *, rlim) 473 { 474 struct rlimit r; 475 int ret; 476 mm_segment_t old_fs = get_fs(); 477 478 set_fs(KERNEL_DS); 479 ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r); 480 set_fs(old_fs); 481 482 if (!ret) { 483 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 484 r.rlim_cur = COMPAT_RLIM_INFINITY; 485 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 486 r.rlim_max = COMPAT_RLIM_INFINITY; 487 488 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 489 __put_user(r.rlim_cur, &rlim->rlim_cur) || 490 __put_user(r.rlim_max, &rlim->rlim_max)) 491 return -EFAULT; 492 } 493 return ret; 494 } 495 496 #endif 497 498 COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource, 499 struct compat_rlimit __user *, rlim) 500 { 501 struct rlimit r; 502 int ret; 503 504 ret = do_prlimit(current, resource, NULL, &r); 505 if (!ret) { 506 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 507 r.rlim_cur = COMPAT_RLIM_INFINITY; 508 if (r.rlim_max > COMPAT_RLIM_INFINITY) 509 r.rlim_max = COMPAT_RLIM_INFINITY; 510 511 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 512 __put_user(r.rlim_cur, &rlim->rlim_cur) || 513 __put_user(r.rlim_max, &rlim->rlim_max)) 514 return -EFAULT; 515 } 516 return ret; 517 } 518 519 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 520 { 521 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 522 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 523 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 524 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 525 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 526 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 527 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 528 __put_user(r->ru_idrss, &ru->ru_idrss) || 529 __put_user(r->ru_isrss, &ru->ru_isrss) || 530 __put_user(r->ru_minflt, &ru->ru_minflt) || 531 __put_user(r->ru_majflt, &ru->ru_majflt) || 532 __put_user(r->ru_nswap, &ru->ru_nswap) || 533 __put_user(r->ru_inblock, &ru->ru_inblock) || 534 __put_user(r->ru_oublock, &ru->ru_oublock) || 535 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 536 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 537 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 538 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 539 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 540 return -EFAULT; 541 return 0; 542 } 543 544 COMPAT_SYSCALL_DEFINE4(wait4, 545 compat_pid_t, pid, 546 compat_uint_t __user *, stat_addr, 547 int, options, 548 struct compat_rusage __user *, ru) 549 { 550 if (!ru) { 551 return sys_wait4(pid, stat_addr, options, NULL); 552 } else { 553 struct rusage r; 554 int ret; 555 unsigned int status; 556 mm_segment_t old_fs = get_fs(); 557 558 set_fs (KERNEL_DS); 559 ret = sys_wait4(pid, 560 (stat_addr ? 561 (unsigned int __user *) &status : NULL), 562 options, (struct rusage __user *) &r); 563 set_fs (old_fs); 564 565 if (ret > 0) { 566 if (put_compat_rusage(&r, ru)) 567 return -EFAULT; 568 if (stat_addr && put_user(status, stat_addr)) 569 return -EFAULT; 570 } 571 return ret; 572 } 573 } 574 575 COMPAT_SYSCALL_DEFINE5(waitid, 576 int, which, compat_pid_t, pid, 577 struct compat_siginfo __user *, uinfo, int, options, 578 struct compat_rusage __user *, uru) 579 { 580 siginfo_t info; 581 struct rusage ru; 582 long ret; 583 mm_segment_t old_fs = get_fs(); 584 585 memset(&info, 0, sizeof(info)); 586 587 set_fs(KERNEL_DS); 588 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 589 uru ? (struct rusage __user *)&ru : NULL); 590 set_fs(old_fs); 591 592 if ((ret < 0) || (info.si_signo == 0)) 593 return ret; 594 595 if (uru) { 596 /* sys_waitid() overwrites everything in ru */ 597 if (COMPAT_USE_64BIT_TIME) 598 ret = copy_to_user(uru, &ru, sizeof(ru)); 599 else 600 ret = put_compat_rusage(&ru, uru); 601 if (ret) 602 return -EFAULT; 603 } 604 605 BUG_ON(info.si_code & __SI_MASK); 606 info.si_code |= __SI_CHLD; 607 return copy_siginfo_to_user32(uinfo, &info); 608 } 609 610 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 611 unsigned len, struct cpumask *new_mask) 612 { 613 unsigned long *k; 614 615 if (len < cpumask_size()) 616 memset(new_mask, 0, cpumask_size()); 617 else if (len > cpumask_size()) 618 len = cpumask_size(); 619 620 k = cpumask_bits(new_mask); 621 return compat_get_bitmap(k, user_mask_ptr, len * 8); 622 } 623 624 COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid, 625 unsigned int, len, 626 compat_ulong_t __user *, user_mask_ptr) 627 { 628 cpumask_var_t new_mask; 629 int retval; 630 631 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 632 return -ENOMEM; 633 634 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 635 if (retval) 636 goto out; 637 638 retval = sched_setaffinity(pid, new_mask); 639 out: 640 free_cpumask_var(new_mask); 641 return retval; 642 } 643 644 COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len, 645 compat_ulong_t __user *, user_mask_ptr) 646 { 647 int ret; 648 cpumask_var_t mask; 649 650 if ((len * BITS_PER_BYTE) < nr_cpu_ids) 651 return -EINVAL; 652 if (len & (sizeof(compat_ulong_t)-1)) 653 return -EINVAL; 654 655 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 656 return -ENOMEM; 657 658 ret = sched_getaffinity(pid, mask); 659 if (ret == 0) { 660 size_t retlen = min_t(size_t, len, cpumask_size()); 661 662 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) 663 ret = -EFAULT; 664 else 665 ret = retlen; 666 } 667 free_cpumask_var(mask); 668 669 return ret; 670 } 671 672 int get_compat_itimerspec(struct itimerspec *dst, 673 const struct compat_itimerspec __user *src) 674 { 675 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) || 676 __compat_get_timespec(&dst->it_value, &src->it_value)) 677 return -EFAULT; 678 return 0; 679 } 680 681 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 682 const struct itimerspec *src) 683 { 684 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) || 685 __compat_put_timespec(&src->it_value, &dst->it_value)) 686 return -EFAULT; 687 return 0; 688 } 689 690 COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock, 691 struct compat_sigevent __user *, timer_event_spec, 692 timer_t __user *, created_timer_id) 693 { 694 struct sigevent __user *event = NULL; 695 696 if (timer_event_spec) { 697 struct sigevent kevent; 698 699 event = compat_alloc_user_space(sizeof(*event)); 700 if (get_compat_sigevent(&kevent, timer_event_spec) || 701 copy_to_user(event, &kevent, sizeof(*event))) 702 return -EFAULT; 703 } 704 705 return sys_timer_create(which_clock, event, created_timer_id); 706 } 707 708 COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, 709 struct compat_itimerspec __user *, new, 710 struct compat_itimerspec __user *, old) 711 { 712 long err; 713 mm_segment_t oldfs; 714 struct itimerspec newts, oldts; 715 716 if (!new) 717 return -EINVAL; 718 if (get_compat_itimerspec(&newts, new)) 719 return -EFAULT; 720 oldfs = get_fs(); 721 set_fs(KERNEL_DS); 722 err = sys_timer_settime(timer_id, flags, 723 (struct itimerspec __user *) &newts, 724 (struct itimerspec __user *) &oldts); 725 set_fs(oldfs); 726 if (!err && old && put_compat_itimerspec(old, &oldts)) 727 return -EFAULT; 728 return err; 729 } 730 731 COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, 732 struct compat_itimerspec __user *, setting) 733 { 734 long err; 735 mm_segment_t oldfs; 736 struct itimerspec ts; 737 738 oldfs = get_fs(); 739 set_fs(KERNEL_DS); 740 err = sys_timer_gettime(timer_id, 741 (struct itimerspec __user *) &ts); 742 set_fs(oldfs); 743 if (!err && put_compat_itimerspec(setting, &ts)) 744 return -EFAULT; 745 return err; 746 } 747 748 COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock, 749 struct compat_timespec __user *, tp) 750 { 751 long err; 752 mm_segment_t oldfs; 753 struct timespec ts; 754 755 if (compat_get_timespec(&ts, tp)) 756 return -EFAULT; 757 oldfs = get_fs(); 758 set_fs(KERNEL_DS); 759 err = sys_clock_settime(which_clock, 760 (struct timespec __user *) &ts); 761 set_fs(oldfs); 762 return err; 763 } 764 765 COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock, 766 struct compat_timespec __user *, tp) 767 { 768 long err; 769 mm_segment_t oldfs; 770 struct timespec ts; 771 772 oldfs = get_fs(); 773 set_fs(KERNEL_DS); 774 err = sys_clock_gettime(which_clock, 775 (struct timespec __user *) &ts); 776 set_fs(oldfs); 777 if (!err && compat_put_timespec(&ts, tp)) 778 return -EFAULT; 779 return err; 780 } 781 782 COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock, 783 struct compat_timex __user *, utp) 784 { 785 struct timex txc; 786 mm_segment_t oldfs; 787 int err, ret; 788 789 err = compat_get_timex(&txc, utp); 790 if (err) 791 return err; 792 793 oldfs = get_fs(); 794 set_fs(KERNEL_DS); 795 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc); 796 set_fs(oldfs); 797 798 err = compat_put_timex(utp, &txc); 799 if (err) 800 return err; 801 802 return ret; 803 } 804 805 COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock, 806 struct compat_timespec __user *, tp) 807 { 808 long err; 809 mm_segment_t oldfs; 810 struct timespec ts; 811 812 oldfs = get_fs(); 813 set_fs(KERNEL_DS); 814 err = sys_clock_getres(which_clock, 815 (struct timespec __user *) &ts); 816 set_fs(oldfs); 817 if (!err && tp && compat_put_timespec(&ts, tp)) 818 return -EFAULT; 819 return err; 820 } 821 822 static long compat_clock_nanosleep_restart(struct restart_block *restart) 823 { 824 long err; 825 mm_segment_t oldfs; 826 struct timespec tu; 827 struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp; 828 829 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 830 oldfs = get_fs(); 831 set_fs(KERNEL_DS); 832 err = clock_nanosleep_restart(restart); 833 set_fs(oldfs); 834 835 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 836 compat_put_timespec(&tu, rmtp)) 837 return -EFAULT; 838 839 if (err == -ERESTART_RESTARTBLOCK) { 840 restart->fn = compat_clock_nanosleep_restart; 841 restart->nanosleep.compat_rmtp = rmtp; 842 } 843 return err; 844 } 845 846 COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags, 847 struct compat_timespec __user *, rqtp, 848 struct compat_timespec __user *, rmtp) 849 { 850 long err; 851 mm_segment_t oldfs; 852 struct timespec in, out; 853 struct restart_block *restart; 854 855 if (compat_get_timespec(&in, rqtp)) 856 return -EFAULT; 857 858 oldfs = get_fs(); 859 set_fs(KERNEL_DS); 860 err = sys_clock_nanosleep(which_clock, flags, 861 (struct timespec __user *) &in, 862 (struct timespec __user *) &out); 863 set_fs(oldfs); 864 865 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 866 compat_put_timespec(&out, rmtp)) 867 return -EFAULT; 868 869 if (err == -ERESTART_RESTARTBLOCK) { 870 restart = ¤t->restart_block; 871 restart->fn = compat_clock_nanosleep_restart; 872 restart->nanosleep.compat_rmtp = rmtp; 873 } 874 return err; 875 } 876 877 /* 878 * We currently only need the following fields from the sigevent 879 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 880 * sigev_notify_thread_id). The others are handled in user mode. 881 * We also assume that copying sigev_value.sival_int is sufficient 882 * to keep all the bits of sigev_value.sival_ptr intact. 883 */ 884 int get_compat_sigevent(struct sigevent *event, 885 const struct compat_sigevent __user *u_event) 886 { 887 memset(event, 0, sizeof(*event)); 888 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 889 __get_user(event->sigev_value.sival_int, 890 &u_event->sigev_value.sival_int) || 891 __get_user(event->sigev_signo, &u_event->sigev_signo) || 892 __get_user(event->sigev_notify, &u_event->sigev_notify) || 893 __get_user(event->sigev_notify_thread_id, 894 &u_event->sigev_notify_thread_id)) 895 ? -EFAULT : 0; 896 } 897 898 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 899 unsigned long bitmap_size) 900 { 901 int i, j; 902 unsigned long m; 903 compat_ulong_t um; 904 unsigned long nr_compat_longs; 905 906 /* align bitmap up to nearest compat_long_t boundary */ 907 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 908 909 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 910 return -EFAULT; 911 912 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 913 914 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 915 m = 0; 916 917 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 918 /* 919 * We dont want to read past the end of the userspace 920 * bitmap. We must however ensure the end of the 921 * kernel bitmap is zeroed. 922 */ 923 if (nr_compat_longs) { 924 nr_compat_longs--; 925 if (__get_user(um, umask)) 926 return -EFAULT; 927 } else { 928 um = 0; 929 } 930 931 umask++; 932 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 933 } 934 *mask++ = m; 935 } 936 937 return 0; 938 } 939 940 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 941 unsigned long bitmap_size) 942 { 943 int i, j; 944 unsigned long m; 945 compat_ulong_t um; 946 unsigned long nr_compat_longs; 947 948 /* align bitmap up to nearest compat_long_t boundary */ 949 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 950 951 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 952 return -EFAULT; 953 954 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 955 956 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 957 m = *mask++; 958 959 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 960 um = m; 961 962 /* 963 * We dont want to write past the end of the userspace 964 * bitmap. 965 */ 966 if (nr_compat_longs) { 967 nr_compat_longs--; 968 if (__put_user(um, umask)) 969 return -EFAULT; 970 } 971 972 umask++; 973 m >>= 4*sizeof(um); 974 m >>= 4*sizeof(um); 975 } 976 } 977 978 return 0; 979 } 980 981 void 982 sigset_from_compat(sigset_t *set, const compat_sigset_t *compat) 983 { 984 switch (_NSIG_WORDS) { 985 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 986 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 987 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 988 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 989 } 990 } 991 EXPORT_SYMBOL_GPL(sigset_from_compat); 992 993 void 994 sigset_to_compat(compat_sigset_t *compat, const sigset_t *set) 995 { 996 switch (_NSIG_WORDS) { 997 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3]; 998 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2]; 999 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1]; 1000 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0]; 1001 } 1002 } 1003 1004 COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese, 1005 struct compat_siginfo __user *, uinfo, 1006 struct compat_timespec __user *, uts, compat_size_t, sigsetsize) 1007 { 1008 compat_sigset_t s32; 1009 sigset_t s; 1010 struct timespec t; 1011 siginfo_t info; 1012 long ret; 1013 1014 if (sigsetsize != sizeof(sigset_t)) 1015 return -EINVAL; 1016 1017 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 1018 return -EFAULT; 1019 sigset_from_compat(&s, &s32); 1020 1021 if (uts) { 1022 if (compat_get_timespec(&t, uts)) 1023 return -EFAULT; 1024 } 1025 1026 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL); 1027 1028 if (ret > 0 && uinfo) { 1029 if (copy_siginfo_to_user32(uinfo, &info)) 1030 ret = -EFAULT; 1031 } 1032 1033 return ret; 1034 } 1035 1036 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 1037 1038 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 1039 1040 COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc) 1041 { 1042 compat_time_t i; 1043 struct timeval tv; 1044 1045 do_gettimeofday(&tv); 1046 i = tv.tv_sec; 1047 1048 if (tloc) { 1049 if (put_user(i,tloc)) 1050 return -EFAULT; 1051 } 1052 force_successful_syscall_return(); 1053 return i; 1054 } 1055 1056 COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr) 1057 { 1058 struct timespec tv; 1059 int err; 1060 1061 if (get_user(tv.tv_sec, tptr)) 1062 return -EFAULT; 1063 1064 tv.tv_nsec = 0; 1065 1066 err = security_settime(&tv, NULL); 1067 if (err) 1068 return err; 1069 1070 do_settimeofday(&tv); 1071 return 0; 1072 } 1073 1074 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 1075 1076 COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp) 1077 { 1078 struct timex txc; 1079 int err, ret; 1080 1081 err = compat_get_timex(&txc, utp); 1082 if (err) 1083 return err; 1084 1085 ret = do_adjtimex(&txc); 1086 1087 err = compat_put_timex(utp, &txc); 1088 if (err) 1089 return err; 1090 1091 return ret; 1092 } 1093 1094 #ifdef CONFIG_NUMA 1095 COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages, 1096 compat_uptr_t __user *, pages32, 1097 const int __user *, nodes, 1098 int __user *, status, 1099 int, flags) 1100 { 1101 const void __user * __user *pages; 1102 int i; 1103 1104 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1105 for (i = 0; i < nr_pages; i++) { 1106 compat_uptr_t p; 1107 1108 if (get_user(p, pages32 + i) || 1109 put_user(compat_ptr(p), pages + i)) 1110 return -EFAULT; 1111 } 1112 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1113 } 1114 1115 COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid, 1116 compat_ulong_t, maxnode, 1117 const compat_ulong_t __user *, old_nodes, 1118 const compat_ulong_t __user *, new_nodes) 1119 { 1120 unsigned long __user *old = NULL; 1121 unsigned long __user *new = NULL; 1122 nodemask_t tmp_mask; 1123 unsigned long nr_bits; 1124 unsigned long size; 1125 1126 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1127 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1128 if (old_nodes) { 1129 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1130 return -EFAULT; 1131 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1132 if (new_nodes) 1133 new = old + size / sizeof(unsigned long); 1134 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1135 return -EFAULT; 1136 } 1137 if (new_nodes) { 1138 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1139 return -EFAULT; 1140 if (new == NULL) 1141 new = compat_alloc_user_space(size); 1142 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1143 return -EFAULT; 1144 } 1145 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1146 } 1147 #endif 1148 1149 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval, 1150 compat_pid_t, pid, 1151 struct compat_timespec __user *, interval) 1152 { 1153 struct timespec t; 1154 int ret; 1155 mm_segment_t old_fs = get_fs(); 1156 1157 set_fs(KERNEL_DS); 1158 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); 1159 set_fs(old_fs); 1160 if (compat_put_timespec(&t, interval)) 1161 return -EFAULT; 1162 return ret; 1163 } 1164 1165 /* 1166 * Allocate user-space memory for the duration of a single system call, 1167 * in order to marshall parameters inside a compat thunk. 1168 */ 1169 void __user *compat_alloc_user_space(unsigned long len) 1170 { 1171 void __user *ptr; 1172 1173 /* If len would occupy more than half of the entire compat space... */ 1174 if (unlikely(len > (((compat_uptr_t)~0) >> 1))) 1175 return NULL; 1176 1177 ptr = arch_compat_alloc_user_space(len); 1178 1179 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) 1180 return NULL; 1181 1182 return ptr; 1183 } 1184 EXPORT_SYMBOL_GPL(compat_alloc_user_space); 1185