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 = ¤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 COMPAT_SYSCALL_DEFINE2(getitimer, int, which, 311 struct compat_itimerval __user *, it) 312 { 313 struct itimerval kit; 314 int error; 315 316 error = do_getitimer(which, &kit); 317 if (!error && put_compat_itimerval(it, &kit)) 318 error = -EFAULT; 319 return error; 320 } 321 322 COMPAT_SYSCALL_DEFINE3(setitimer, int, which, 323 struct compat_itimerval __user *, in, 324 struct compat_itimerval __user *, out) 325 { 326 struct itimerval kin, kout; 327 int error; 328 329 if (in) { 330 if (get_compat_itimerval(&kin, in)) 331 return -EFAULT; 332 } else 333 memset(&kin, 0, sizeof(kin)); 334 335 error = do_setitimer(which, &kin, out ? &kout : NULL); 336 if (error || !out) 337 return error; 338 if (put_compat_itimerval(out, &kout)) 339 return -EFAULT; 340 return 0; 341 } 342 343 static compat_clock_t clock_t_to_compat_clock_t(clock_t x) 344 { 345 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); 346 } 347 348 COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf) 349 { 350 if (tbuf) { 351 struct tms tms; 352 struct compat_tms tmp; 353 354 do_sys_times(&tms); 355 /* Convert our struct tms to the compat version. */ 356 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); 357 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); 358 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); 359 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); 360 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 361 return -EFAULT; 362 } 363 force_successful_syscall_return(); 364 return compat_jiffies_to_clock_t(jiffies); 365 } 366 367 #ifdef __ARCH_WANT_SYS_SIGPENDING 368 369 /* 370 * Assumption: old_sigset_t and compat_old_sigset_t are both 371 * types that can be passed to put_user()/get_user(). 372 */ 373 374 COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set) 375 { 376 old_sigset_t s; 377 long ret; 378 mm_segment_t old_fs = get_fs(); 379 380 set_fs(KERNEL_DS); 381 ret = sys_sigpending((old_sigset_t __user *) &s); 382 set_fs(old_fs); 383 if (ret == 0) 384 ret = put_user(s, set); 385 return ret; 386 } 387 388 #endif 389 390 #ifdef __ARCH_WANT_SYS_SIGPROCMASK 391 392 /* 393 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the 394 * blocked set of signals to the supplied signal set 395 */ 396 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set) 397 { 398 memcpy(blocked->sig, &set, sizeof(set)); 399 } 400 401 COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how, 402 compat_old_sigset_t __user *, nset, 403 compat_old_sigset_t __user *, oset) 404 { 405 old_sigset_t old_set, new_set; 406 sigset_t new_blocked; 407 408 old_set = current->blocked.sig[0]; 409 410 if (nset) { 411 if (get_user(new_set, nset)) 412 return -EFAULT; 413 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP)); 414 415 new_blocked = current->blocked; 416 417 switch (how) { 418 case SIG_BLOCK: 419 sigaddsetmask(&new_blocked, new_set); 420 break; 421 case SIG_UNBLOCK: 422 sigdelsetmask(&new_blocked, new_set); 423 break; 424 case SIG_SETMASK: 425 compat_sig_setmask(&new_blocked, new_set); 426 break; 427 default: 428 return -EINVAL; 429 } 430 431 set_current_blocked(&new_blocked); 432 } 433 434 if (oset) { 435 if (put_user(old_set, oset)) 436 return -EFAULT; 437 } 438 439 return 0; 440 } 441 442 #endif 443 444 COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource, 445 struct compat_rlimit __user *, rlim) 446 { 447 struct rlimit r; 448 449 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 450 __get_user(r.rlim_cur, &rlim->rlim_cur) || 451 __get_user(r.rlim_max, &rlim->rlim_max)) 452 return -EFAULT; 453 454 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 455 r.rlim_cur = RLIM_INFINITY; 456 if (r.rlim_max == COMPAT_RLIM_INFINITY) 457 r.rlim_max = RLIM_INFINITY; 458 return do_prlimit(current, resource, &r, NULL); 459 } 460 461 #ifdef COMPAT_RLIM_OLD_INFINITY 462 463 COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, 464 struct compat_rlimit __user *, rlim) 465 { 466 struct rlimit r; 467 int ret; 468 mm_segment_t old_fs = get_fs(); 469 470 set_fs(KERNEL_DS); 471 ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r); 472 set_fs(old_fs); 473 474 if (!ret) { 475 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 476 r.rlim_cur = COMPAT_RLIM_INFINITY; 477 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 478 r.rlim_max = COMPAT_RLIM_INFINITY; 479 480 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 481 __put_user(r.rlim_cur, &rlim->rlim_cur) || 482 __put_user(r.rlim_max, &rlim->rlim_max)) 483 return -EFAULT; 484 } 485 return ret; 486 } 487 488 #endif 489 490 COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource, 491 struct compat_rlimit __user *, rlim) 492 { 493 struct rlimit r; 494 int ret; 495 496 ret = do_prlimit(current, resource, NULL, &r); 497 if (!ret) { 498 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 499 r.rlim_cur = COMPAT_RLIM_INFINITY; 500 if (r.rlim_max > COMPAT_RLIM_INFINITY) 501 r.rlim_max = COMPAT_RLIM_INFINITY; 502 503 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 504 __put_user(r.rlim_cur, &rlim->rlim_cur) || 505 __put_user(r.rlim_max, &rlim->rlim_max)) 506 return -EFAULT; 507 } 508 return ret; 509 } 510 511 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 512 { 513 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 514 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 515 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 516 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 517 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 518 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 519 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 520 __put_user(r->ru_idrss, &ru->ru_idrss) || 521 __put_user(r->ru_isrss, &ru->ru_isrss) || 522 __put_user(r->ru_minflt, &ru->ru_minflt) || 523 __put_user(r->ru_majflt, &ru->ru_majflt) || 524 __put_user(r->ru_nswap, &ru->ru_nswap) || 525 __put_user(r->ru_inblock, &ru->ru_inblock) || 526 __put_user(r->ru_oublock, &ru->ru_oublock) || 527 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 528 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 529 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 530 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 531 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 532 return -EFAULT; 533 return 0; 534 } 535 536 COMPAT_SYSCALL_DEFINE4(wait4, 537 compat_pid_t, pid, 538 compat_uint_t __user *, stat_addr, 539 int, options, 540 struct compat_rusage __user *, ru) 541 { 542 if (!ru) { 543 return sys_wait4(pid, stat_addr, options, NULL); 544 } else { 545 struct rusage r; 546 int ret; 547 unsigned int status; 548 mm_segment_t old_fs = get_fs(); 549 550 set_fs (KERNEL_DS); 551 ret = sys_wait4(pid, 552 (stat_addr ? 553 (unsigned int __user *) &status : NULL), 554 options, (struct rusage __user *) &r); 555 set_fs (old_fs); 556 557 if (ret > 0) { 558 if (put_compat_rusage(&r, ru)) 559 return -EFAULT; 560 if (stat_addr && put_user(status, stat_addr)) 561 return -EFAULT; 562 } 563 return ret; 564 } 565 } 566 567 COMPAT_SYSCALL_DEFINE5(waitid, 568 int, which, compat_pid_t, pid, 569 struct compat_siginfo __user *, uinfo, int, options, 570 struct compat_rusage __user *, uru) 571 { 572 siginfo_t info; 573 struct rusage ru; 574 long ret; 575 mm_segment_t old_fs = get_fs(); 576 577 memset(&info, 0, sizeof(info)); 578 579 set_fs(KERNEL_DS); 580 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 581 uru ? (struct rusage __user *)&ru : NULL); 582 set_fs(old_fs); 583 584 if ((ret < 0) || (info.si_signo == 0)) 585 return ret; 586 587 if (uru) { 588 /* sys_waitid() overwrites everything in ru */ 589 if (COMPAT_USE_64BIT_TIME) 590 ret = copy_to_user(uru, &ru, sizeof(ru)); 591 else 592 ret = put_compat_rusage(&ru, uru); 593 if (ret) 594 return -EFAULT; 595 } 596 597 BUG_ON(info.si_code & __SI_MASK); 598 info.si_code |= __SI_CHLD; 599 return copy_siginfo_to_user32(uinfo, &info); 600 } 601 602 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 603 unsigned len, struct cpumask *new_mask) 604 { 605 unsigned long *k; 606 607 if (len < cpumask_size()) 608 memset(new_mask, 0, cpumask_size()); 609 else if (len > cpumask_size()) 610 len = cpumask_size(); 611 612 k = cpumask_bits(new_mask); 613 return compat_get_bitmap(k, user_mask_ptr, len * 8); 614 } 615 616 COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid, 617 unsigned int, len, 618 compat_ulong_t __user *, user_mask_ptr) 619 { 620 cpumask_var_t new_mask; 621 int retval; 622 623 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 624 return -ENOMEM; 625 626 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 627 if (retval) 628 goto out; 629 630 retval = sched_setaffinity(pid, new_mask); 631 out: 632 free_cpumask_var(new_mask); 633 return retval; 634 } 635 636 COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len, 637 compat_ulong_t __user *, user_mask_ptr) 638 { 639 int ret; 640 cpumask_var_t mask; 641 642 if ((len * BITS_PER_BYTE) < nr_cpu_ids) 643 return -EINVAL; 644 if (len & (sizeof(compat_ulong_t)-1)) 645 return -EINVAL; 646 647 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 648 return -ENOMEM; 649 650 ret = sched_getaffinity(pid, mask); 651 if (ret == 0) { 652 size_t retlen = min_t(size_t, len, cpumask_size()); 653 654 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) 655 ret = -EFAULT; 656 else 657 ret = retlen; 658 } 659 free_cpumask_var(mask); 660 661 return ret; 662 } 663 664 int get_compat_itimerspec(struct itimerspec *dst, 665 const struct compat_itimerspec __user *src) 666 { 667 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) || 668 __compat_get_timespec(&dst->it_value, &src->it_value)) 669 return -EFAULT; 670 return 0; 671 } 672 673 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 674 const struct itimerspec *src) 675 { 676 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) || 677 __compat_put_timespec(&src->it_value, &dst->it_value)) 678 return -EFAULT; 679 return 0; 680 } 681 682 COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock, 683 struct compat_sigevent __user *, timer_event_spec, 684 timer_t __user *, created_timer_id) 685 { 686 struct sigevent __user *event = NULL; 687 688 if (timer_event_spec) { 689 struct sigevent kevent; 690 691 event = compat_alloc_user_space(sizeof(*event)); 692 if (get_compat_sigevent(&kevent, timer_event_spec) || 693 copy_to_user(event, &kevent, sizeof(*event))) 694 return -EFAULT; 695 } 696 697 return sys_timer_create(which_clock, event, created_timer_id); 698 } 699 700 COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, 701 struct compat_itimerspec __user *, new, 702 struct compat_itimerspec __user *, old) 703 { 704 long err; 705 mm_segment_t oldfs; 706 struct itimerspec newts, oldts; 707 708 if (!new) 709 return -EINVAL; 710 if (get_compat_itimerspec(&newts, new)) 711 return -EFAULT; 712 oldfs = get_fs(); 713 set_fs(KERNEL_DS); 714 err = sys_timer_settime(timer_id, flags, 715 (struct itimerspec __user *) &newts, 716 (struct itimerspec __user *) &oldts); 717 set_fs(oldfs); 718 if (!err && old && put_compat_itimerspec(old, &oldts)) 719 return -EFAULT; 720 return err; 721 } 722 723 COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, 724 struct compat_itimerspec __user *, setting) 725 { 726 long err; 727 mm_segment_t oldfs; 728 struct itimerspec ts; 729 730 oldfs = get_fs(); 731 set_fs(KERNEL_DS); 732 err = sys_timer_gettime(timer_id, 733 (struct itimerspec __user *) &ts); 734 set_fs(oldfs); 735 if (!err && put_compat_itimerspec(setting, &ts)) 736 return -EFAULT; 737 return err; 738 } 739 740 COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock, 741 struct compat_timespec __user *, tp) 742 { 743 long err; 744 mm_segment_t oldfs; 745 struct timespec ts; 746 747 if (compat_get_timespec(&ts, tp)) 748 return -EFAULT; 749 oldfs = get_fs(); 750 set_fs(KERNEL_DS); 751 err = sys_clock_settime(which_clock, 752 (struct timespec __user *) &ts); 753 set_fs(oldfs); 754 return err; 755 } 756 757 COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock, 758 struct compat_timespec __user *, tp) 759 { 760 long err; 761 mm_segment_t oldfs; 762 struct timespec ts; 763 764 oldfs = get_fs(); 765 set_fs(KERNEL_DS); 766 err = sys_clock_gettime(which_clock, 767 (struct timespec __user *) &ts); 768 set_fs(oldfs); 769 if (!err && compat_put_timespec(&ts, tp)) 770 return -EFAULT; 771 return err; 772 } 773 774 COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock, 775 struct compat_timex __user *, utp) 776 { 777 struct timex txc; 778 mm_segment_t oldfs; 779 int err, ret; 780 781 err = compat_get_timex(&txc, utp); 782 if (err) 783 return err; 784 785 oldfs = get_fs(); 786 set_fs(KERNEL_DS); 787 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc); 788 set_fs(oldfs); 789 790 err = compat_put_timex(utp, &txc); 791 if (err) 792 return err; 793 794 return ret; 795 } 796 797 COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock, 798 struct compat_timespec __user *, tp) 799 { 800 long err; 801 mm_segment_t oldfs; 802 struct timespec ts; 803 804 oldfs = get_fs(); 805 set_fs(KERNEL_DS); 806 err = sys_clock_getres(which_clock, 807 (struct timespec __user *) &ts); 808 set_fs(oldfs); 809 if (!err && tp && compat_put_timespec(&ts, tp)) 810 return -EFAULT; 811 return err; 812 } 813 814 static long compat_clock_nanosleep_restart(struct restart_block *restart) 815 { 816 long err; 817 mm_segment_t oldfs; 818 struct timespec tu; 819 struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp; 820 821 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 822 oldfs = get_fs(); 823 set_fs(KERNEL_DS); 824 err = clock_nanosleep_restart(restart); 825 set_fs(oldfs); 826 827 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 828 compat_put_timespec(&tu, rmtp)) 829 return -EFAULT; 830 831 if (err == -ERESTART_RESTARTBLOCK) { 832 restart->fn = compat_clock_nanosleep_restart; 833 restart->nanosleep.compat_rmtp = rmtp; 834 } 835 return err; 836 } 837 838 COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags, 839 struct compat_timespec __user *, rqtp, 840 struct compat_timespec __user *, rmtp) 841 { 842 long err; 843 mm_segment_t oldfs; 844 struct timespec in, out; 845 struct restart_block *restart; 846 847 if (compat_get_timespec(&in, rqtp)) 848 return -EFAULT; 849 850 oldfs = get_fs(); 851 set_fs(KERNEL_DS); 852 err = sys_clock_nanosleep(which_clock, flags, 853 (struct timespec __user *) &in, 854 (struct timespec __user *) &out); 855 set_fs(oldfs); 856 857 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 858 compat_put_timespec(&out, rmtp)) 859 return -EFAULT; 860 861 if (err == -ERESTART_RESTARTBLOCK) { 862 restart = ¤t->restart_block; 863 restart->fn = compat_clock_nanosleep_restart; 864 restart->nanosleep.compat_rmtp = rmtp; 865 } 866 return err; 867 } 868 869 /* 870 * We currently only need the following fields from the sigevent 871 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 872 * sigev_notify_thread_id). The others are handled in user mode. 873 * We also assume that copying sigev_value.sival_int is sufficient 874 * to keep all the bits of sigev_value.sival_ptr intact. 875 */ 876 int get_compat_sigevent(struct sigevent *event, 877 const struct compat_sigevent __user *u_event) 878 { 879 memset(event, 0, sizeof(*event)); 880 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 881 __get_user(event->sigev_value.sival_int, 882 &u_event->sigev_value.sival_int) || 883 __get_user(event->sigev_signo, &u_event->sigev_signo) || 884 __get_user(event->sigev_notify, &u_event->sigev_notify) || 885 __get_user(event->sigev_notify_thread_id, 886 &u_event->sigev_notify_thread_id)) 887 ? -EFAULT : 0; 888 } 889 890 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 891 unsigned long bitmap_size) 892 { 893 int i, j; 894 unsigned long m; 895 compat_ulong_t um; 896 unsigned long nr_compat_longs; 897 898 /* align bitmap up to nearest compat_long_t boundary */ 899 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 900 901 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 902 return -EFAULT; 903 904 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 905 906 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 907 m = 0; 908 909 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 910 /* 911 * We dont want to read past the end of the userspace 912 * bitmap. We must however ensure the end of the 913 * kernel bitmap is zeroed. 914 */ 915 if (nr_compat_longs) { 916 nr_compat_longs--; 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) { 959 nr_compat_longs--; 960 if (__put_user(um, umask)) 961 return -EFAULT; 962 } 963 964 umask++; 965 m >>= 4*sizeof(um); 966 m >>= 4*sizeof(um); 967 } 968 } 969 970 return 0; 971 } 972 973 void 974 sigset_from_compat(sigset_t *set, const compat_sigset_t *compat) 975 { 976 switch (_NSIG_WORDS) { 977 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 978 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 979 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 980 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 981 } 982 } 983 EXPORT_SYMBOL_GPL(sigset_from_compat); 984 985 void 986 sigset_to_compat(compat_sigset_t *compat, const sigset_t *set) 987 { 988 switch (_NSIG_WORDS) { 989 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3]; 990 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2]; 991 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1]; 992 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0]; 993 } 994 } 995 996 COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese, 997 struct compat_siginfo __user *, uinfo, 998 struct compat_timespec __user *, uts, compat_size_t, sigsetsize) 999 { 1000 compat_sigset_t s32; 1001 sigset_t s; 1002 struct timespec t; 1003 siginfo_t info; 1004 long ret; 1005 1006 if (sigsetsize != sizeof(sigset_t)) 1007 return -EINVAL; 1008 1009 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 1010 return -EFAULT; 1011 sigset_from_compat(&s, &s32); 1012 1013 if (uts) { 1014 if (compat_get_timespec(&t, uts)) 1015 return -EFAULT; 1016 } 1017 1018 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL); 1019 1020 if (ret > 0 && uinfo) { 1021 if (copy_siginfo_to_user32(uinfo, &info)) 1022 ret = -EFAULT; 1023 } 1024 1025 return ret; 1026 } 1027 1028 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 1029 1030 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 1031 1032 COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc) 1033 { 1034 compat_time_t i; 1035 struct timeval tv; 1036 1037 do_gettimeofday(&tv); 1038 i = tv.tv_sec; 1039 1040 if (tloc) { 1041 if (put_user(i,tloc)) 1042 return -EFAULT; 1043 } 1044 force_successful_syscall_return(); 1045 return i; 1046 } 1047 1048 COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr) 1049 { 1050 struct timespec tv; 1051 int err; 1052 1053 if (get_user(tv.tv_sec, tptr)) 1054 return -EFAULT; 1055 1056 tv.tv_nsec = 0; 1057 1058 err = security_settime(&tv, NULL); 1059 if (err) 1060 return err; 1061 1062 do_settimeofday(&tv); 1063 return 0; 1064 } 1065 1066 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 1067 1068 COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp) 1069 { 1070 struct timex txc; 1071 int err, ret; 1072 1073 err = compat_get_timex(&txc, utp); 1074 if (err) 1075 return err; 1076 1077 ret = do_adjtimex(&txc); 1078 1079 err = compat_put_timex(utp, &txc); 1080 if (err) 1081 return err; 1082 1083 return ret; 1084 } 1085 1086 #ifdef CONFIG_NUMA 1087 COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages, 1088 compat_uptr_t __user *, pages32, 1089 const int __user *, nodes, 1090 int __user *, status, 1091 int, flags) 1092 { 1093 const void __user * __user *pages; 1094 int i; 1095 1096 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1097 for (i = 0; i < nr_pages; i++) { 1098 compat_uptr_t p; 1099 1100 if (get_user(p, pages32 + i) || 1101 put_user(compat_ptr(p), pages + i)) 1102 return -EFAULT; 1103 } 1104 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1105 } 1106 1107 COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid, 1108 compat_ulong_t, maxnode, 1109 const compat_ulong_t __user *, old_nodes, 1110 const compat_ulong_t __user *, new_nodes) 1111 { 1112 unsigned long __user *old = NULL; 1113 unsigned long __user *new = NULL; 1114 nodemask_t tmp_mask; 1115 unsigned long nr_bits; 1116 unsigned long size; 1117 1118 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1119 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1120 if (old_nodes) { 1121 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1122 return -EFAULT; 1123 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1124 if (new_nodes) 1125 new = old + size / sizeof(unsigned long); 1126 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1127 return -EFAULT; 1128 } 1129 if (new_nodes) { 1130 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1131 return -EFAULT; 1132 if (new == NULL) 1133 new = compat_alloc_user_space(size); 1134 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1135 return -EFAULT; 1136 } 1137 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1138 } 1139 #endif 1140 1141 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval, 1142 compat_pid_t, pid, 1143 struct compat_timespec __user *, interval) 1144 { 1145 struct timespec t; 1146 int ret; 1147 mm_segment_t old_fs = get_fs(); 1148 1149 set_fs(KERNEL_DS); 1150 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); 1151 set_fs(old_fs); 1152 if (compat_put_timespec(&t, interval)) 1153 return -EFAULT; 1154 return ret; 1155 } 1156 1157 /* 1158 * Allocate user-space memory for the duration of a single system call, 1159 * in order to marshall parameters inside a compat thunk. 1160 */ 1161 void __user *compat_alloc_user_space(unsigned long len) 1162 { 1163 void __user *ptr; 1164 1165 /* If len would occupy more than half of the entire compat space... */ 1166 if (unlikely(len > (((compat_uptr_t)~0) >> 1))) 1167 return NULL; 1168 1169 ptr = arch_compat_alloc_user_space(len); 1170 1171 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) 1172 return NULL; 1173 1174 return ptr; 1175 } 1176 EXPORT_SYMBOL_GPL(compat_alloc_user_space); 1177