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 <asm/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 280 = ¤t_thread_info()->restart_block; 281 282 restart->fn = compat_nanosleep_restart; 283 restart->nanosleep.compat_rmtp = rmtp; 284 285 if (rmtp && compat_put_timespec(&rmt, rmtp)) 286 return -EFAULT; 287 } 288 return ret; 289 } 290 291 static inline long get_compat_itimerval(struct itimerval *o, 292 struct compat_itimerval __user *i) 293 { 294 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 295 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 296 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 297 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 298 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 299 } 300 301 static inline long put_compat_itimerval(struct compat_itimerval __user *o, 302 struct itimerval *i) 303 { 304 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 305 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 306 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 307 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 308 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 309 } 310 311 COMPAT_SYSCALL_DEFINE2(getitimer, int, which, 312 struct compat_itimerval __user *, it) 313 { 314 struct itimerval kit; 315 int error; 316 317 error = do_getitimer(which, &kit); 318 if (!error && put_compat_itimerval(it, &kit)) 319 error = -EFAULT; 320 return error; 321 } 322 323 COMPAT_SYSCALL_DEFINE3(setitimer, int, which, 324 struct compat_itimerval __user *, in, 325 struct compat_itimerval __user *, out) 326 { 327 struct itimerval kin, kout; 328 int error; 329 330 if (in) { 331 if (get_compat_itimerval(&kin, in)) 332 return -EFAULT; 333 } else 334 memset(&kin, 0, sizeof(kin)); 335 336 error = do_setitimer(which, &kin, out ? &kout : NULL); 337 if (error || !out) 338 return error; 339 if (put_compat_itimerval(out, &kout)) 340 return -EFAULT; 341 return 0; 342 } 343 344 static compat_clock_t clock_t_to_compat_clock_t(clock_t x) 345 { 346 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); 347 } 348 349 COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf) 350 { 351 if (tbuf) { 352 struct tms tms; 353 struct compat_tms tmp; 354 355 do_sys_times(&tms); 356 /* Convert our struct tms to the compat version. */ 357 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); 358 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); 359 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); 360 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); 361 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 362 return -EFAULT; 363 } 364 force_successful_syscall_return(); 365 return compat_jiffies_to_clock_t(jiffies); 366 } 367 368 #ifdef __ARCH_WANT_SYS_SIGPENDING 369 370 /* 371 * Assumption: old_sigset_t and compat_old_sigset_t are both 372 * types that can be passed to put_user()/get_user(). 373 */ 374 375 COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set) 376 { 377 old_sigset_t s; 378 long ret; 379 mm_segment_t old_fs = get_fs(); 380 381 set_fs(KERNEL_DS); 382 ret = sys_sigpending((old_sigset_t __user *) &s); 383 set_fs(old_fs); 384 if (ret == 0) 385 ret = put_user(s, set); 386 return ret; 387 } 388 389 #endif 390 391 #ifdef __ARCH_WANT_SYS_SIGPROCMASK 392 393 /* 394 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the 395 * blocked set of signals to the supplied signal set 396 */ 397 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set) 398 { 399 memcpy(blocked->sig, &set, sizeof(set)); 400 } 401 402 COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how, 403 compat_old_sigset_t __user *, nset, 404 compat_old_sigset_t __user *, oset) 405 { 406 old_sigset_t old_set, new_set; 407 sigset_t new_blocked; 408 409 old_set = current->blocked.sig[0]; 410 411 if (nset) { 412 if (get_user(new_set, nset)) 413 return -EFAULT; 414 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP)); 415 416 new_blocked = current->blocked; 417 418 switch (how) { 419 case SIG_BLOCK: 420 sigaddsetmask(&new_blocked, new_set); 421 break; 422 case SIG_UNBLOCK: 423 sigdelsetmask(&new_blocked, new_set); 424 break; 425 case SIG_SETMASK: 426 compat_sig_setmask(&new_blocked, new_set); 427 break; 428 default: 429 return -EINVAL; 430 } 431 432 set_current_blocked(&new_blocked); 433 } 434 435 if (oset) { 436 if (put_user(old_set, oset)) 437 return -EFAULT; 438 } 439 440 return 0; 441 } 442 443 #endif 444 445 COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource, 446 struct compat_rlimit __user *, rlim) 447 { 448 struct rlimit r; 449 450 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 451 __get_user(r.rlim_cur, &rlim->rlim_cur) || 452 __get_user(r.rlim_max, &rlim->rlim_max)) 453 return -EFAULT; 454 455 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 456 r.rlim_cur = RLIM_INFINITY; 457 if (r.rlim_max == COMPAT_RLIM_INFINITY) 458 r.rlim_max = RLIM_INFINITY; 459 return do_prlimit(current, resource, &r, NULL); 460 } 461 462 #ifdef COMPAT_RLIM_OLD_INFINITY 463 464 COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, 465 struct compat_rlimit __user *, rlim) 466 { 467 struct rlimit r; 468 int ret; 469 mm_segment_t old_fs = get_fs(); 470 471 set_fs(KERNEL_DS); 472 ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r); 473 set_fs(old_fs); 474 475 if (!ret) { 476 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 477 r.rlim_cur = COMPAT_RLIM_INFINITY; 478 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 479 r.rlim_max = COMPAT_RLIM_INFINITY; 480 481 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 482 __put_user(r.rlim_cur, &rlim->rlim_cur) || 483 __put_user(r.rlim_max, &rlim->rlim_max)) 484 return -EFAULT; 485 } 486 return ret; 487 } 488 489 #endif 490 491 COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource, 492 struct compat_rlimit __user *, rlim) 493 { 494 struct rlimit r; 495 int ret; 496 497 ret = do_prlimit(current, resource, NULL, &r); 498 if (!ret) { 499 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 500 r.rlim_cur = COMPAT_RLIM_INFINITY; 501 if (r.rlim_max > COMPAT_RLIM_INFINITY) 502 r.rlim_max = COMPAT_RLIM_INFINITY; 503 504 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 505 __put_user(r.rlim_cur, &rlim->rlim_cur) || 506 __put_user(r.rlim_max, &rlim->rlim_max)) 507 return -EFAULT; 508 } 509 return ret; 510 } 511 512 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 513 { 514 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 515 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 516 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 517 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 518 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 519 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 520 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 521 __put_user(r->ru_idrss, &ru->ru_idrss) || 522 __put_user(r->ru_isrss, &ru->ru_isrss) || 523 __put_user(r->ru_minflt, &ru->ru_minflt) || 524 __put_user(r->ru_majflt, &ru->ru_majflt) || 525 __put_user(r->ru_nswap, &ru->ru_nswap) || 526 __put_user(r->ru_inblock, &ru->ru_inblock) || 527 __put_user(r->ru_oublock, &ru->ru_oublock) || 528 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 529 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 530 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 531 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 532 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 533 return -EFAULT; 534 return 0; 535 } 536 537 COMPAT_SYSCALL_DEFINE4(wait4, 538 compat_pid_t, pid, 539 compat_uint_t __user *, stat_addr, 540 int, options, 541 struct compat_rusage __user *, ru) 542 { 543 if (!ru) { 544 return sys_wait4(pid, stat_addr, options, NULL); 545 } else { 546 struct rusage r; 547 int ret; 548 unsigned int status; 549 mm_segment_t old_fs = get_fs(); 550 551 set_fs (KERNEL_DS); 552 ret = sys_wait4(pid, 553 (stat_addr ? 554 (unsigned int __user *) &status : NULL), 555 options, (struct rusage __user *) &r); 556 set_fs (old_fs); 557 558 if (ret > 0) { 559 if (put_compat_rusage(&r, ru)) 560 return -EFAULT; 561 if (stat_addr && put_user(status, stat_addr)) 562 return -EFAULT; 563 } 564 return ret; 565 } 566 } 567 568 COMPAT_SYSCALL_DEFINE5(waitid, 569 int, which, compat_pid_t, pid, 570 struct compat_siginfo __user *, uinfo, int, options, 571 struct compat_rusage __user *, uru) 572 { 573 siginfo_t info; 574 struct rusage ru; 575 long ret; 576 mm_segment_t old_fs = get_fs(); 577 578 memset(&info, 0, sizeof(info)); 579 580 set_fs(KERNEL_DS); 581 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 582 uru ? (struct rusage __user *)&ru : NULL); 583 set_fs(old_fs); 584 585 if ((ret < 0) || (info.si_signo == 0)) 586 return ret; 587 588 if (uru) { 589 /* sys_waitid() overwrites everything in ru */ 590 if (COMPAT_USE_64BIT_TIME) 591 ret = copy_to_user(uru, &ru, sizeof(ru)); 592 else 593 ret = put_compat_rusage(&ru, uru); 594 if (ret) 595 return -EFAULT; 596 } 597 598 BUG_ON(info.si_code & __SI_MASK); 599 info.si_code |= __SI_CHLD; 600 return copy_siginfo_to_user32(uinfo, &info); 601 } 602 603 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 604 unsigned len, struct cpumask *new_mask) 605 { 606 unsigned long *k; 607 608 if (len < cpumask_size()) 609 memset(new_mask, 0, cpumask_size()); 610 else if (len > cpumask_size()) 611 len = cpumask_size(); 612 613 k = cpumask_bits(new_mask); 614 return compat_get_bitmap(k, user_mask_ptr, len * 8); 615 } 616 617 COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid, 618 unsigned int, len, 619 compat_ulong_t __user *, user_mask_ptr) 620 { 621 cpumask_var_t new_mask; 622 int retval; 623 624 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 625 return -ENOMEM; 626 627 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 628 if (retval) 629 goto out; 630 631 retval = sched_setaffinity(pid, new_mask); 632 out: 633 free_cpumask_var(new_mask); 634 return retval; 635 } 636 637 COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len, 638 compat_ulong_t __user *, user_mask_ptr) 639 { 640 int ret; 641 cpumask_var_t mask; 642 643 if ((len * BITS_PER_BYTE) < nr_cpu_ids) 644 return -EINVAL; 645 if (len & (sizeof(compat_ulong_t)-1)) 646 return -EINVAL; 647 648 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 649 return -ENOMEM; 650 651 ret = sched_getaffinity(pid, mask); 652 if (ret == 0) { 653 size_t retlen = min_t(size_t, len, cpumask_size()); 654 655 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) 656 ret = -EFAULT; 657 else 658 ret = retlen; 659 } 660 free_cpumask_var(mask); 661 662 return ret; 663 } 664 665 int get_compat_itimerspec(struct itimerspec *dst, 666 const struct compat_itimerspec __user *src) 667 { 668 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) || 669 __compat_get_timespec(&dst->it_value, &src->it_value)) 670 return -EFAULT; 671 return 0; 672 } 673 674 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 675 const struct itimerspec *src) 676 { 677 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) || 678 __compat_put_timespec(&src->it_value, &dst->it_value)) 679 return -EFAULT; 680 return 0; 681 } 682 683 COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock, 684 struct compat_sigevent __user *, timer_event_spec, 685 timer_t __user *, created_timer_id) 686 { 687 struct sigevent __user *event = NULL; 688 689 if (timer_event_spec) { 690 struct sigevent kevent; 691 692 event = compat_alloc_user_space(sizeof(*event)); 693 if (get_compat_sigevent(&kevent, timer_event_spec) || 694 copy_to_user(event, &kevent, sizeof(*event))) 695 return -EFAULT; 696 } 697 698 return sys_timer_create(which_clock, event, created_timer_id); 699 } 700 701 COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, 702 struct compat_itimerspec __user *, new, 703 struct compat_itimerspec __user *, old) 704 { 705 long err; 706 mm_segment_t oldfs; 707 struct itimerspec newts, oldts; 708 709 if (!new) 710 return -EINVAL; 711 if (get_compat_itimerspec(&newts, new)) 712 return -EFAULT; 713 oldfs = get_fs(); 714 set_fs(KERNEL_DS); 715 err = sys_timer_settime(timer_id, flags, 716 (struct itimerspec __user *) &newts, 717 (struct itimerspec __user *) &oldts); 718 set_fs(oldfs); 719 if (!err && old && put_compat_itimerspec(old, &oldts)) 720 return -EFAULT; 721 return err; 722 } 723 724 COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, 725 struct compat_itimerspec __user *, setting) 726 { 727 long err; 728 mm_segment_t oldfs; 729 struct itimerspec ts; 730 731 oldfs = get_fs(); 732 set_fs(KERNEL_DS); 733 err = sys_timer_gettime(timer_id, 734 (struct itimerspec __user *) &ts); 735 set_fs(oldfs); 736 if (!err && put_compat_itimerspec(setting, &ts)) 737 return -EFAULT; 738 return err; 739 } 740 741 COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock, 742 struct compat_timespec __user *, tp) 743 { 744 long err; 745 mm_segment_t oldfs; 746 struct timespec ts; 747 748 if (compat_get_timespec(&ts, tp)) 749 return -EFAULT; 750 oldfs = get_fs(); 751 set_fs(KERNEL_DS); 752 err = sys_clock_settime(which_clock, 753 (struct timespec __user *) &ts); 754 set_fs(oldfs); 755 return err; 756 } 757 758 COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock, 759 struct compat_timespec __user *, tp) 760 { 761 long err; 762 mm_segment_t oldfs; 763 struct timespec ts; 764 765 oldfs = get_fs(); 766 set_fs(KERNEL_DS); 767 err = sys_clock_gettime(which_clock, 768 (struct timespec __user *) &ts); 769 set_fs(oldfs); 770 if (!err && compat_put_timespec(&ts, tp)) 771 return -EFAULT; 772 return err; 773 } 774 775 COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock, 776 struct compat_timex __user *, utp) 777 { 778 struct timex txc; 779 mm_segment_t oldfs; 780 int err, ret; 781 782 err = compat_get_timex(&txc, utp); 783 if (err) 784 return err; 785 786 oldfs = get_fs(); 787 set_fs(KERNEL_DS); 788 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc); 789 set_fs(oldfs); 790 791 err = compat_put_timex(utp, &txc); 792 if (err) 793 return err; 794 795 return ret; 796 } 797 798 COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock, 799 struct compat_timespec __user *, tp) 800 { 801 long err; 802 mm_segment_t oldfs; 803 struct timespec ts; 804 805 oldfs = get_fs(); 806 set_fs(KERNEL_DS); 807 err = sys_clock_getres(which_clock, 808 (struct timespec __user *) &ts); 809 set_fs(oldfs); 810 if (!err && tp && compat_put_timespec(&ts, tp)) 811 return -EFAULT; 812 return err; 813 } 814 815 static long compat_clock_nanosleep_restart(struct restart_block *restart) 816 { 817 long err; 818 mm_segment_t oldfs; 819 struct timespec tu; 820 struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp; 821 822 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 823 oldfs = get_fs(); 824 set_fs(KERNEL_DS); 825 err = clock_nanosleep_restart(restart); 826 set_fs(oldfs); 827 828 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 829 compat_put_timespec(&tu, rmtp)) 830 return -EFAULT; 831 832 if (err == -ERESTART_RESTARTBLOCK) { 833 restart->fn = compat_clock_nanosleep_restart; 834 restart->nanosleep.compat_rmtp = rmtp; 835 } 836 return err; 837 } 838 839 COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags, 840 struct compat_timespec __user *, rqtp, 841 struct compat_timespec __user *, rmtp) 842 { 843 long err; 844 mm_segment_t oldfs; 845 struct timespec in, out; 846 struct restart_block *restart; 847 848 if (compat_get_timespec(&in, rqtp)) 849 return -EFAULT; 850 851 oldfs = get_fs(); 852 set_fs(KERNEL_DS); 853 err = sys_clock_nanosleep(which_clock, flags, 854 (struct timespec __user *) &in, 855 (struct timespec __user *) &out); 856 set_fs(oldfs); 857 858 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 859 compat_put_timespec(&out, rmtp)) 860 return -EFAULT; 861 862 if (err == -ERESTART_RESTARTBLOCK) { 863 restart = ¤t_thread_info()->restart_block; 864 restart->fn = compat_clock_nanosleep_restart; 865 restart->nanosleep.compat_rmtp = rmtp; 866 } 867 return err; 868 } 869 870 /* 871 * We currently only need the following fields from the sigevent 872 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 873 * sigev_notify_thread_id). The others are handled in user mode. 874 * We also assume that copying sigev_value.sival_int is sufficient 875 * to keep all the bits of sigev_value.sival_ptr intact. 876 */ 877 int get_compat_sigevent(struct sigevent *event, 878 const struct compat_sigevent __user *u_event) 879 { 880 memset(event, 0, sizeof(*event)); 881 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 882 __get_user(event->sigev_value.sival_int, 883 &u_event->sigev_value.sival_int) || 884 __get_user(event->sigev_signo, &u_event->sigev_signo) || 885 __get_user(event->sigev_notify, &u_event->sigev_notify) || 886 __get_user(event->sigev_notify_thread_id, 887 &u_event->sigev_notify_thread_id)) 888 ? -EFAULT : 0; 889 } 890 891 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 892 unsigned long bitmap_size) 893 { 894 int i, j; 895 unsigned long m; 896 compat_ulong_t um; 897 unsigned long nr_compat_longs; 898 899 /* align bitmap up to nearest compat_long_t boundary */ 900 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 901 902 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 903 return -EFAULT; 904 905 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 906 907 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 908 m = 0; 909 910 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 911 /* 912 * We dont want to read past the end of the userspace 913 * bitmap. We must however ensure the end of the 914 * kernel bitmap is zeroed. 915 */ 916 if (nr_compat_longs-- > 0) { 917 if (__get_user(um, umask)) 918 return -EFAULT; 919 } else { 920 um = 0; 921 } 922 923 umask++; 924 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 925 } 926 *mask++ = m; 927 } 928 929 return 0; 930 } 931 932 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 933 unsigned long bitmap_size) 934 { 935 int i, j; 936 unsigned long m; 937 compat_ulong_t um; 938 unsigned long nr_compat_longs; 939 940 /* align bitmap up to nearest compat_long_t boundary */ 941 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 942 943 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 944 return -EFAULT; 945 946 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 947 948 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 949 m = *mask++; 950 951 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 952 um = m; 953 954 /* 955 * We dont want to write past the end of the userspace 956 * bitmap. 957 */ 958 if (nr_compat_longs-- > 0) { 959 if (__put_user(um, umask)) 960 return -EFAULT; 961 } 962 963 umask++; 964 m >>= 4*sizeof(um); 965 m >>= 4*sizeof(um); 966 } 967 } 968 969 return 0; 970 } 971 972 void 973 sigset_from_compat(sigset_t *set, const compat_sigset_t *compat) 974 { 975 switch (_NSIG_WORDS) { 976 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 977 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 978 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 979 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 980 } 981 } 982 EXPORT_SYMBOL_GPL(sigset_from_compat); 983 984 void 985 sigset_to_compat(compat_sigset_t *compat, const sigset_t *set) 986 { 987 switch (_NSIG_WORDS) { 988 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3]; 989 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2]; 990 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1]; 991 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0]; 992 } 993 } 994 995 COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese, 996 struct compat_siginfo __user *, uinfo, 997 struct compat_timespec __user *, uts, compat_size_t, sigsetsize) 998 { 999 compat_sigset_t s32; 1000 sigset_t s; 1001 struct timespec t; 1002 siginfo_t info; 1003 long ret; 1004 1005 if (sigsetsize != sizeof(sigset_t)) 1006 return -EINVAL; 1007 1008 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 1009 return -EFAULT; 1010 sigset_from_compat(&s, &s32); 1011 1012 if (uts) { 1013 if (compat_get_timespec(&t, uts)) 1014 return -EFAULT; 1015 } 1016 1017 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL); 1018 1019 if (ret > 0 && uinfo) { 1020 if (copy_siginfo_to_user32(uinfo, &info)) 1021 ret = -EFAULT; 1022 } 1023 1024 return ret; 1025 } 1026 1027 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 1028 1029 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 1030 1031 COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc) 1032 { 1033 compat_time_t i; 1034 struct timeval tv; 1035 1036 do_gettimeofday(&tv); 1037 i = tv.tv_sec; 1038 1039 if (tloc) { 1040 if (put_user(i,tloc)) 1041 return -EFAULT; 1042 } 1043 force_successful_syscall_return(); 1044 return i; 1045 } 1046 1047 COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr) 1048 { 1049 struct timespec tv; 1050 int err; 1051 1052 if (get_user(tv.tv_sec, tptr)) 1053 return -EFAULT; 1054 1055 tv.tv_nsec = 0; 1056 1057 err = security_settime(&tv, NULL); 1058 if (err) 1059 return err; 1060 1061 do_settimeofday(&tv); 1062 return 0; 1063 } 1064 1065 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 1066 1067 COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp) 1068 { 1069 struct timex txc; 1070 int err, ret; 1071 1072 err = compat_get_timex(&txc, utp); 1073 if (err) 1074 return err; 1075 1076 ret = do_adjtimex(&txc); 1077 1078 err = compat_put_timex(utp, &txc); 1079 if (err) 1080 return err; 1081 1082 return ret; 1083 } 1084 1085 #ifdef CONFIG_NUMA 1086 COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages, 1087 compat_uptr_t __user *, pages32, 1088 const int __user *, nodes, 1089 int __user *, status, 1090 int, flags) 1091 { 1092 const void __user * __user *pages; 1093 int i; 1094 1095 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1096 for (i = 0; i < nr_pages; i++) { 1097 compat_uptr_t p; 1098 1099 if (get_user(p, pages32 + i) || 1100 put_user(compat_ptr(p), pages + i)) 1101 return -EFAULT; 1102 } 1103 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1104 } 1105 1106 COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid, 1107 compat_ulong_t, maxnode, 1108 const compat_ulong_t __user *, old_nodes, 1109 const compat_ulong_t __user *, new_nodes) 1110 { 1111 unsigned long __user *old = NULL; 1112 unsigned long __user *new = NULL; 1113 nodemask_t tmp_mask; 1114 unsigned long nr_bits; 1115 unsigned long size; 1116 1117 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1118 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1119 if (old_nodes) { 1120 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1121 return -EFAULT; 1122 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1123 if (new_nodes) 1124 new = old + size / sizeof(unsigned long); 1125 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1126 return -EFAULT; 1127 } 1128 if (new_nodes) { 1129 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1130 return -EFAULT; 1131 if (new == NULL) 1132 new = compat_alloc_user_space(size); 1133 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1134 return -EFAULT; 1135 } 1136 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1137 } 1138 #endif 1139 1140 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval, 1141 compat_pid_t, pid, 1142 struct compat_timespec __user *, interval) 1143 { 1144 struct timespec t; 1145 int ret; 1146 mm_segment_t old_fs = get_fs(); 1147 1148 set_fs(KERNEL_DS); 1149 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); 1150 set_fs(old_fs); 1151 if (compat_put_timespec(&t, interval)) 1152 return -EFAULT; 1153 return ret; 1154 } 1155 1156 /* 1157 * Allocate user-space memory for the duration of a single system call, 1158 * in order to marshall parameters inside a compat thunk. 1159 */ 1160 void __user *compat_alloc_user_space(unsigned long len) 1161 { 1162 void __user *ptr; 1163 1164 /* If len would occupy more than half of the entire compat space... */ 1165 if (unlikely(len > (((compat_uptr_t)~0) >> 1))) 1166 return NULL; 1167 1168 ptr = arch_compat_alloc_user_space(len); 1169 1170 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) 1171 return NULL; 1172 1173 return ptr; 1174 } 1175 EXPORT_SYMBOL_GPL(compat_alloc_user_space); 1176