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 timespec64 new_ts; 112 struct timeval user_tv; 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_settimeofday64(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 struct timespec64 tu64; 244 mm_segment_t oldfs; 245 long ret; 246 247 if (compat_get_timespec(&tu, rqtp)) 248 return -EFAULT; 249 250 tu64 = timespec_to_timespec64(tu); 251 if (!timespec64_valid(&tu64)) 252 return -EINVAL; 253 254 oldfs = get_fs(); 255 set_fs(KERNEL_DS); 256 ret = hrtimer_nanosleep(&tu64, 257 rmtp ? (struct timespec __user *)&rmt : NULL, 258 HRTIMER_MODE_REL, CLOCK_MONOTONIC); 259 set_fs(oldfs); 260 261 /* 262 * hrtimer_nanosleep() can only return 0 or 263 * -ERESTART_RESTARTBLOCK here because: 264 * 265 * - we call it with HRTIMER_MODE_REL and therefor exclude the 266 * -ERESTARTNOHAND return path. 267 * 268 * - we supply the rmtp argument from the task stack (due to 269 * the necessary compat conversion. So the update cannot 270 * fail, which excludes the -EFAULT return path as well. If 271 * it fails nevertheless we have a bigger problem and wont 272 * reach this place anymore. 273 * 274 * - if the return value is 0, we do not have to update rmtp 275 * because there is no remaining time. 276 * 277 * We check for -ERESTART_RESTARTBLOCK nevertheless if the 278 * core implementation decides to return random nonsense. 279 */ 280 if (ret == -ERESTART_RESTARTBLOCK) { 281 struct restart_block *restart = ¤t->restart_block; 282 283 restart->fn = compat_nanosleep_restart; 284 restart->nanosleep.compat_rmtp = rmtp; 285 286 if (rmtp && compat_put_timespec(&rmt, rmtp)) 287 return -EFAULT; 288 } 289 return ret; 290 } 291 292 static inline long get_compat_itimerval(struct itimerval *o, 293 struct compat_itimerval __user *i) 294 { 295 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 296 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 297 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 298 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 299 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 300 } 301 302 static inline long put_compat_itimerval(struct compat_itimerval __user *o, 303 struct itimerval *i) 304 { 305 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 306 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 307 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 308 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 309 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 310 } 311 312 asmlinkage long sys_ni_posix_timers(void); 313 314 COMPAT_SYSCALL_DEFINE2(getitimer, int, which, 315 struct compat_itimerval __user *, it) 316 { 317 struct itimerval kit; 318 int error; 319 320 if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) 321 return sys_ni_posix_timers(); 322 323 error = do_getitimer(which, &kit); 324 if (!error && put_compat_itimerval(it, &kit)) 325 error = -EFAULT; 326 return error; 327 } 328 329 COMPAT_SYSCALL_DEFINE3(setitimer, int, which, 330 struct compat_itimerval __user *, in, 331 struct compat_itimerval __user *, out) 332 { 333 struct itimerval kin, kout; 334 int error; 335 336 if (!IS_ENABLED(CONFIG_POSIX_TIMERS)) 337 return sys_ni_posix_timers(); 338 339 if (in) { 340 if (get_compat_itimerval(&kin, in)) 341 return -EFAULT; 342 } else 343 memset(&kin, 0, sizeof(kin)); 344 345 error = do_setitimer(which, &kin, out ? &kout : NULL); 346 if (error || !out) 347 return error; 348 if (put_compat_itimerval(out, &kout)) 349 return -EFAULT; 350 return 0; 351 } 352 353 static compat_clock_t clock_t_to_compat_clock_t(clock_t x) 354 { 355 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); 356 } 357 358 COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf) 359 { 360 if (tbuf) { 361 struct tms tms; 362 struct compat_tms tmp; 363 364 do_sys_times(&tms); 365 /* Convert our struct tms to the compat version. */ 366 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); 367 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); 368 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); 369 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); 370 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 371 return -EFAULT; 372 } 373 force_successful_syscall_return(); 374 return compat_jiffies_to_clock_t(jiffies); 375 } 376 377 #ifdef __ARCH_WANT_SYS_SIGPENDING 378 379 /* 380 * Assumption: old_sigset_t and compat_old_sigset_t are both 381 * types that can be passed to put_user()/get_user(). 382 */ 383 384 COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set) 385 { 386 old_sigset_t s; 387 long ret; 388 mm_segment_t old_fs = get_fs(); 389 390 set_fs(KERNEL_DS); 391 ret = sys_sigpending((old_sigset_t __user *) &s); 392 set_fs(old_fs); 393 if (ret == 0) 394 ret = put_user(s, set); 395 return ret; 396 } 397 398 #endif 399 400 #ifdef __ARCH_WANT_SYS_SIGPROCMASK 401 402 /* 403 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the 404 * blocked set of signals to the supplied signal set 405 */ 406 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set) 407 { 408 memcpy(blocked->sig, &set, sizeof(set)); 409 } 410 411 COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how, 412 compat_old_sigset_t __user *, nset, 413 compat_old_sigset_t __user *, oset) 414 { 415 old_sigset_t old_set, new_set; 416 sigset_t new_blocked; 417 418 old_set = current->blocked.sig[0]; 419 420 if (nset) { 421 if (get_user(new_set, nset)) 422 return -EFAULT; 423 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP)); 424 425 new_blocked = current->blocked; 426 427 switch (how) { 428 case SIG_BLOCK: 429 sigaddsetmask(&new_blocked, new_set); 430 break; 431 case SIG_UNBLOCK: 432 sigdelsetmask(&new_blocked, new_set); 433 break; 434 case SIG_SETMASK: 435 compat_sig_setmask(&new_blocked, new_set); 436 break; 437 default: 438 return -EINVAL; 439 } 440 441 set_current_blocked(&new_blocked); 442 } 443 444 if (oset) { 445 if (put_user(old_set, oset)) 446 return -EFAULT; 447 } 448 449 return 0; 450 } 451 452 #endif 453 454 COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource, 455 struct compat_rlimit __user *, rlim) 456 { 457 struct rlimit r; 458 459 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 460 __get_user(r.rlim_cur, &rlim->rlim_cur) || 461 __get_user(r.rlim_max, &rlim->rlim_max)) 462 return -EFAULT; 463 464 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 465 r.rlim_cur = RLIM_INFINITY; 466 if (r.rlim_max == COMPAT_RLIM_INFINITY) 467 r.rlim_max = RLIM_INFINITY; 468 return do_prlimit(current, resource, &r, NULL); 469 } 470 471 #ifdef COMPAT_RLIM_OLD_INFINITY 472 473 COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, 474 struct compat_rlimit __user *, rlim) 475 { 476 struct rlimit r; 477 int ret; 478 mm_segment_t old_fs = get_fs(); 479 480 set_fs(KERNEL_DS); 481 ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r); 482 set_fs(old_fs); 483 484 if (!ret) { 485 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 486 r.rlim_cur = COMPAT_RLIM_INFINITY; 487 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 488 r.rlim_max = COMPAT_RLIM_INFINITY; 489 490 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 491 __put_user(r.rlim_cur, &rlim->rlim_cur) || 492 __put_user(r.rlim_max, &rlim->rlim_max)) 493 return -EFAULT; 494 } 495 return ret; 496 } 497 498 #endif 499 500 COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource, 501 struct compat_rlimit __user *, rlim) 502 { 503 struct rlimit r; 504 int ret; 505 506 ret = do_prlimit(current, resource, NULL, &r); 507 if (!ret) { 508 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 509 r.rlim_cur = COMPAT_RLIM_INFINITY; 510 if (r.rlim_max > COMPAT_RLIM_INFINITY) 511 r.rlim_max = COMPAT_RLIM_INFINITY; 512 513 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 514 __put_user(r.rlim_cur, &rlim->rlim_cur) || 515 __put_user(r.rlim_max, &rlim->rlim_max)) 516 return -EFAULT; 517 } 518 return ret; 519 } 520 521 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 522 { 523 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 524 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 525 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 526 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 527 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 528 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 529 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 530 __put_user(r->ru_idrss, &ru->ru_idrss) || 531 __put_user(r->ru_isrss, &ru->ru_isrss) || 532 __put_user(r->ru_minflt, &ru->ru_minflt) || 533 __put_user(r->ru_majflt, &ru->ru_majflt) || 534 __put_user(r->ru_nswap, &ru->ru_nswap) || 535 __put_user(r->ru_inblock, &ru->ru_inblock) || 536 __put_user(r->ru_oublock, &ru->ru_oublock) || 537 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 538 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 539 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 540 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 541 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 542 return -EFAULT; 543 return 0; 544 } 545 546 COMPAT_SYSCALL_DEFINE4(wait4, 547 compat_pid_t, pid, 548 compat_uint_t __user *, stat_addr, 549 int, options, 550 struct compat_rusage __user *, ru) 551 { 552 if (!ru) { 553 return sys_wait4(pid, stat_addr, options, NULL); 554 } else { 555 struct rusage r; 556 int ret; 557 unsigned int status; 558 mm_segment_t old_fs = get_fs(); 559 560 set_fs (KERNEL_DS); 561 ret = sys_wait4(pid, 562 (stat_addr ? 563 (unsigned int __user *) &status : NULL), 564 options, (struct rusage __user *) &r); 565 set_fs (old_fs); 566 567 if (ret > 0) { 568 if (put_compat_rusage(&r, ru)) 569 return -EFAULT; 570 if (stat_addr && put_user(status, stat_addr)) 571 return -EFAULT; 572 } 573 return ret; 574 } 575 } 576 577 COMPAT_SYSCALL_DEFINE5(waitid, 578 int, which, compat_pid_t, pid, 579 struct compat_siginfo __user *, uinfo, int, options, 580 struct compat_rusage __user *, uru) 581 { 582 siginfo_t info; 583 struct rusage ru; 584 long ret; 585 mm_segment_t old_fs = get_fs(); 586 587 memset(&info, 0, sizeof(info)); 588 589 set_fs(KERNEL_DS); 590 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 591 uru ? (struct rusage __user *)&ru : NULL); 592 set_fs(old_fs); 593 594 if ((ret < 0) || (info.si_signo == 0)) 595 return ret; 596 597 if (uru) { 598 /* sys_waitid() overwrites everything in ru */ 599 if (COMPAT_USE_64BIT_TIME) 600 ret = copy_to_user(uru, &ru, sizeof(ru)); 601 else 602 ret = put_compat_rusage(&ru, uru); 603 if (ret) 604 return -EFAULT; 605 } 606 607 BUG_ON(info.si_code & __SI_MASK); 608 info.si_code |= __SI_CHLD; 609 return copy_siginfo_to_user32(uinfo, &info); 610 } 611 612 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 613 unsigned len, struct cpumask *new_mask) 614 { 615 unsigned long *k; 616 617 if (len < cpumask_size()) 618 memset(new_mask, 0, cpumask_size()); 619 else if (len > cpumask_size()) 620 len = cpumask_size(); 621 622 k = cpumask_bits(new_mask); 623 return compat_get_bitmap(k, user_mask_ptr, len * 8); 624 } 625 626 COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid, 627 unsigned int, len, 628 compat_ulong_t __user *, user_mask_ptr) 629 { 630 cpumask_var_t new_mask; 631 int retval; 632 633 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 634 return -ENOMEM; 635 636 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 637 if (retval) 638 goto out; 639 640 retval = sched_setaffinity(pid, new_mask); 641 out: 642 free_cpumask_var(new_mask); 643 return retval; 644 } 645 646 COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len, 647 compat_ulong_t __user *, user_mask_ptr) 648 { 649 int ret; 650 cpumask_var_t mask; 651 652 if ((len * BITS_PER_BYTE) < nr_cpu_ids) 653 return -EINVAL; 654 if (len & (sizeof(compat_ulong_t)-1)) 655 return -EINVAL; 656 657 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 658 return -ENOMEM; 659 660 ret = sched_getaffinity(pid, mask); 661 if (ret == 0) { 662 size_t retlen = min_t(size_t, len, cpumask_size()); 663 664 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) 665 ret = -EFAULT; 666 else 667 ret = retlen; 668 } 669 free_cpumask_var(mask); 670 671 return ret; 672 } 673 674 int get_compat_itimerspec(struct itimerspec *dst, 675 const struct compat_itimerspec __user *src) 676 { 677 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) || 678 __compat_get_timespec(&dst->it_value, &src->it_value)) 679 return -EFAULT; 680 return 0; 681 } 682 683 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 684 const struct itimerspec *src) 685 { 686 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) || 687 __compat_put_timespec(&src->it_value, &dst->it_value)) 688 return -EFAULT; 689 return 0; 690 } 691 692 COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock, 693 struct compat_sigevent __user *, timer_event_spec, 694 timer_t __user *, created_timer_id) 695 { 696 struct sigevent __user *event = NULL; 697 698 if (timer_event_spec) { 699 struct sigevent kevent; 700 701 event = compat_alloc_user_space(sizeof(*event)); 702 if (get_compat_sigevent(&kevent, timer_event_spec) || 703 copy_to_user(event, &kevent, sizeof(*event))) 704 return -EFAULT; 705 } 706 707 return sys_timer_create(which_clock, event, created_timer_id); 708 } 709 710 COMPAT_SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, 711 struct compat_itimerspec __user *, new, 712 struct compat_itimerspec __user *, old) 713 { 714 long err; 715 mm_segment_t oldfs; 716 struct itimerspec newts, oldts; 717 718 if (!new) 719 return -EINVAL; 720 if (get_compat_itimerspec(&newts, new)) 721 return -EFAULT; 722 oldfs = get_fs(); 723 set_fs(KERNEL_DS); 724 err = sys_timer_settime(timer_id, flags, 725 (struct itimerspec __user *) &newts, 726 (struct itimerspec __user *) &oldts); 727 set_fs(oldfs); 728 if (!err && old && put_compat_itimerspec(old, &oldts)) 729 return -EFAULT; 730 return err; 731 } 732 733 COMPAT_SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, 734 struct compat_itimerspec __user *, setting) 735 { 736 long err; 737 mm_segment_t oldfs; 738 struct itimerspec ts; 739 740 oldfs = get_fs(); 741 set_fs(KERNEL_DS); 742 err = sys_timer_gettime(timer_id, 743 (struct itimerspec __user *) &ts); 744 set_fs(oldfs); 745 if (!err && put_compat_itimerspec(setting, &ts)) 746 return -EFAULT; 747 return err; 748 } 749 750 COMPAT_SYSCALL_DEFINE2(clock_settime, clockid_t, which_clock, 751 struct compat_timespec __user *, tp) 752 { 753 long err; 754 mm_segment_t oldfs; 755 struct timespec ts; 756 757 if (compat_get_timespec(&ts, tp)) 758 return -EFAULT; 759 oldfs = get_fs(); 760 set_fs(KERNEL_DS); 761 err = sys_clock_settime(which_clock, 762 (struct timespec __user *) &ts); 763 set_fs(oldfs); 764 return err; 765 } 766 767 COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock, 768 struct compat_timespec __user *, tp) 769 { 770 long err; 771 mm_segment_t oldfs; 772 struct timespec ts; 773 774 oldfs = get_fs(); 775 set_fs(KERNEL_DS); 776 err = sys_clock_gettime(which_clock, 777 (struct timespec __user *) &ts); 778 set_fs(oldfs); 779 if (!err && compat_put_timespec(&ts, tp)) 780 return -EFAULT; 781 return err; 782 } 783 784 COMPAT_SYSCALL_DEFINE2(clock_adjtime, clockid_t, which_clock, 785 struct compat_timex __user *, utp) 786 { 787 struct timex txc; 788 mm_segment_t oldfs; 789 int err, ret; 790 791 err = compat_get_timex(&txc, utp); 792 if (err) 793 return err; 794 795 oldfs = get_fs(); 796 set_fs(KERNEL_DS); 797 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc); 798 set_fs(oldfs); 799 800 err = compat_put_timex(utp, &txc); 801 if (err) 802 return err; 803 804 return ret; 805 } 806 807 COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock, 808 struct compat_timespec __user *, tp) 809 { 810 long err; 811 mm_segment_t oldfs; 812 struct timespec ts; 813 814 oldfs = get_fs(); 815 set_fs(KERNEL_DS); 816 err = sys_clock_getres(which_clock, 817 (struct timespec __user *) &ts); 818 set_fs(oldfs); 819 if (!err && tp && compat_put_timespec(&ts, tp)) 820 return -EFAULT; 821 return err; 822 } 823 824 static long compat_clock_nanosleep_restart(struct restart_block *restart) 825 { 826 long err; 827 mm_segment_t oldfs; 828 struct timespec tu; 829 struct compat_timespec __user *rmtp = restart->nanosleep.compat_rmtp; 830 831 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 832 oldfs = get_fs(); 833 set_fs(KERNEL_DS); 834 err = clock_nanosleep_restart(restart); 835 set_fs(oldfs); 836 837 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 838 compat_put_timespec(&tu, rmtp)) 839 return -EFAULT; 840 841 if (err == -ERESTART_RESTARTBLOCK) { 842 restart->fn = compat_clock_nanosleep_restart; 843 restart->nanosleep.compat_rmtp = rmtp; 844 } 845 return err; 846 } 847 848 COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags, 849 struct compat_timespec __user *, rqtp, 850 struct compat_timespec __user *, rmtp) 851 { 852 long err; 853 mm_segment_t oldfs; 854 struct timespec in, out; 855 struct restart_block *restart; 856 857 if (compat_get_timespec(&in, rqtp)) 858 return -EFAULT; 859 860 oldfs = get_fs(); 861 set_fs(KERNEL_DS); 862 err = sys_clock_nanosleep(which_clock, flags, 863 (struct timespec __user *) &in, 864 (struct timespec __user *) &out); 865 set_fs(oldfs); 866 867 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 868 compat_put_timespec(&out, rmtp)) 869 return -EFAULT; 870 871 if (err == -ERESTART_RESTARTBLOCK) { 872 restart = ¤t->restart_block; 873 restart->fn = compat_clock_nanosleep_restart; 874 restart->nanosleep.compat_rmtp = rmtp; 875 } 876 return err; 877 } 878 879 /* 880 * We currently only need the following fields from the sigevent 881 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 882 * sigev_notify_thread_id). The others are handled in user mode. 883 * We also assume that copying sigev_value.sival_int is sufficient 884 * to keep all the bits of sigev_value.sival_ptr intact. 885 */ 886 int get_compat_sigevent(struct sigevent *event, 887 const struct compat_sigevent __user *u_event) 888 { 889 memset(event, 0, sizeof(*event)); 890 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 891 __get_user(event->sigev_value.sival_int, 892 &u_event->sigev_value.sival_int) || 893 __get_user(event->sigev_signo, &u_event->sigev_signo) || 894 __get_user(event->sigev_notify, &u_event->sigev_notify) || 895 __get_user(event->sigev_notify_thread_id, 896 &u_event->sigev_notify_thread_id)) 897 ? -EFAULT : 0; 898 } 899 900 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 901 unsigned long bitmap_size) 902 { 903 int i, j; 904 unsigned long m; 905 compat_ulong_t um; 906 unsigned long nr_compat_longs; 907 908 /* align bitmap up to nearest compat_long_t boundary */ 909 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 910 911 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 912 return -EFAULT; 913 914 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 915 916 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 917 m = 0; 918 919 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 920 /* 921 * We dont want to read past the end of the userspace 922 * bitmap. We must however ensure the end of the 923 * kernel bitmap is zeroed. 924 */ 925 if (nr_compat_longs) { 926 nr_compat_longs--; 927 if (__get_user(um, umask)) 928 return -EFAULT; 929 } else { 930 um = 0; 931 } 932 933 umask++; 934 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 935 } 936 *mask++ = m; 937 } 938 939 return 0; 940 } 941 942 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 943 unsigned long bitmap_size) 944 { 945 int i, j; 946 unsigned long m; 947 compat_ulong_t um; 948 unsigned long nr_compat_longs; 949 950 /* align bitmap up to nearest compat_long_t boundary */ 951 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 952 953 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 954 return -EFAULT; 955 956 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 957 958 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 959 m = *mask++; 960 961 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 962 um = m; 963 964 /* 965 * We dont want to write past the end of the userspace 966 * bitmap. 967 */ 968 if (nr_compat_longs) { 969 nr_compat_longs--; 970 if (__put_user(um, umask)) 971 return -EFAULT; 972 } 973 974 umask++; 975 m >>= 4*sizeof(um); 976 m >>= 4*sizeof(um); 977 } 978 } 979 980 return 0; 981 } 982 983 void 984 sigset_from_compat(sigset_t *set, const compat_sigset_t *compat) 985 { 986 switch (_NSIG_WORDS) { 987 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 988 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 989 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 990 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 991 } 992 } 993 EXPORT_SYMBOL_GPL(sigset_from_compat); 994 995 void 996 sigset_to_compat(compat_sigset_t *compat, const sigset_t *set) 997 { 998 switch (_NSIG_WORDS) { 999 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3]; 1000 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2]; 1001 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1]; 1002 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0]; 1003 } 1004 } 1005 1006 COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese, 1007 struct compat_siginfo __user *, uinfo, 1008 struct compat_timespec __user *, uts, compat_size_t, sigsetsize) 1009 { 1010 compat_sigset_t s32; 1011 sigset_t s; 1012 struct timespec t; 1013 siginfo_t info; 1014 long ret; 1015 1016 if (sigsetsize != sizeof(sigset_t)) 1017 return -EINVAL; 1018 1019 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 1020 return -EFAULT; 1021 sigset_from_compat(&s, &s32); 1022 1023 if (uts) { 1024 if (compat_get_timespec(&t, uts)) 1025 return -EFAULT; 1026 } 1027 1028 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL); 1029 1030 if (ret > 0 && uinfo) { 1031 if (copy_siginfo_to_user32(uinfo, &info)) 1032 ret = -EFAULT; 1033 } 1034 1035 return ret; 1036 } 1037 1038 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 1039 1040 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 1041 1042 COMPAT_SYSCALL_DEFINE1(time, compat_time_t __user *, tloc) 1043 { 1044 compat_time_t i; 1045 struct timeval tv; 1046 1047 do_gettimeofday(&tv); 1048 i = tv.tv_sec; 1049 1050 if (tloc) { 1051 if (put_user(i,tloc)) 1052 return -EFAULT; 1053 } 1054 force_successful_syscall_return(); 1055 return i; 1056 } 1057 1058 COMPAT_SYSCALL_DEFINE1(stime, compat_time_t __user *, tptr) 1059 { 1060 struct timespec tv; 1061 int err; 1062 1063 if (get_user(tv.tv_sec, tptr)) 1064 return -EFAULT; 1065 1066 tv.tv_nsec = 0; 1067 1068 err = security_settime(&tv, NULL); 1069 if (err) 1070 return err; 1071 1072 do_settimeofday(&tv); 1073 return 0; 1074 } 1075 1076 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 1077 1078 COMPAT_SYSCALL_DEFINE1(adjtimex, struct compat_timex __user *, utp) 1079 { 1080 struct timex txc; 1081 int err, ret; 1082 1083 err = compat_get_timex(&txc, utp); 1084 if (err) 1085 return err; 1086 1087 ret = do_adjtimex(&txc); 1088 1089 err = compat_put_timex(utp, &txc); 1090 if (err) 1091 return err; 1092 1093 return ret; 1094 } 1095 1096 #ifdef CONFIG_NUMA 1097 COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages, 1098 compat_uptr_t __user *, pages32, 1099 const int __user *, nodes, 1100 int __user *, status, 1101 int, flags) 1102 { 1103 const void __user * __user *pages; 1104 int i; 1105 1106 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1107 for (i = 0; i < nr_pages; i++) { 1108 compat_uptr_t p; 1109 1110 if (get_user(p, pages32 + i) || 1111 put_user(compat_ptr(p), pages + i)) 1112 return -EFAULT; 1113 } 1114 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1115 } 1116 1117 COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid, 1118 compat_ulong_t, maxnode, 1119 const compat_ulong_t __user *, old_nodes, 1120 const compat_ulong_t __user *, new_nodes) 1121 { 1122 unsigned long __user *old = NULL; 1123 unsigned long __user *new = NULL; 1124 nodemask_t tmp_mask; 1125 unsigned long nr_bits; 1126 unsigned long size; 1127 1128 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1129 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1130 if (old_nodes) { 1131 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1132 return -EFAULT; 1133 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1134 if (new_nodes) 1135 new = old + size / sizeof(unsigned long); 1136 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1137 return -EFAULT; 1138 } 1139 if (new_nodes) { 1140 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1141 return -EFAULT; 1142 if (new == NULL) 1143 new = compat_alloc_user_space(size); 1144 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1145 return -EFAULT; 1146 } 1147 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1148 } 1149 #endif 1150 1151 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval, 1152 compat_pid_t, pid, 1153 struct compat_timespec __user *, interval) 1154 { 1155 struct timespec t; 1156 int ret; 1157 mm_segment_t old_fs = get_fs(); 1158 1159 set_fs(KERNEL_DS); 1160 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); 1161 set_fs(old_fs); 1162 if (compat_put_timespec(&t, interval)) 1163 return -EFAULT; 1164 return ret; 1165 } 1166 1167 /* 1168 * Allocate user-space memory for the duration of a single system call, 1169 * in order to marshall parameters inside a compat thunk. 1170 */ 1171 void __user *compat_alloc_user_space(unsigned long len) 1172 { 1173 void __user *ptr; 1174 1175 /* If len would occupy more than half of the entire compat space... */ 1176 if (unlikely(len > (((compat_uptr_t)~0) >> 1))) 1177 return NULL; 1178 1179 ptr = arch_compat_alloc_user_space(len); 1180 1181 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) 1182 return NULL; 1183 1184 return ptr; 1185 } 1186 EXPORT_SYMBOL_GPL(compat_alloc_user_space); 1187