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/migrate.h> 25 #include <linux/posix-timers.h> 26 27 #include <asm/uaccess.h> 28 29 /* 30 * Note that the native side is already converted to a timespec, because 31 * that's what we want anyway. 32 */ 33 static int compat_get_timeval(struct timespec *o, 34 struct compat_timeval __user *i) 35 { 36 long usec; 37 38 if (get_user(o->tv_sec, &i->tv_sec) || 39 get_user(usec, &i->tv_usec)) 40 return -EFAULT; 41 o->tv_nsec = usec * 1000; 42 return 0; 43 } 44 45 static int compat_put_timeval(struct compat_timeval __user *o, 46 struct timeval *i) 47 { 48 return (put_user(i->tv_sec, &o->tv_sec) || 49 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0; 50 } 51 52 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv, 53 struct timezone __user *tz) 54 { 55 if (tv) { 56 struct timeval ktv; 57 do_gettimeofday(&ktv); 58 if (compat_put_timeval(tv, &ktv)) 59 return -EFAULT; 60 } 61 if (tz) { 62 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) 63 return -EFAULT; 64 } 65 66 return 0; 67 } 68 69 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv, 70 struct timezone __user *tz) 71 { 72 struct timespec kts; 73 struct timezone ktz; 74 75 if (tv) { 76 if (compat_get_timeval(&kts, tv)) 77 return -EFAULT; 78 } 79 if (tz) { 80 if (copy_from_user(&ktz, tz, sizeof(ktz))) 81 return -EFAULT; 82 } 83 84 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL); 85 } 86 87 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts) 88 { 89 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || 90 __get_user(ts->tv_sec, &cts->tv_sec) || 91 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 92 } 93 94 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts) 95 { 96 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || 97 __put_user(ts->tv_sec, &cts->tv_sec) || 98 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 99 } 100 101 static long compat_nanosleep_restart(struct restart_block *restart) 102 { 103 struct compat_timespec __user *rmtp; 104 struct timespec rmt; 105 mm_segment_t oldfs; 106 long ret; 107 108 restart->nanosleep.rmtp = (struct timespec __user *) &rmt; 109 oldfs = get_fs(); 110 set_fs(KERNEL_DS); 111 ret = hrtimer_nanosleep_restart(restart); 112 set_fs(oldfs); 113 114 if (ret) { 115 rmtp = restart->nanosleep.compat_rmtp; 116 117 if (rmtp && put_compat_timespec(&rmt, rmtp)) 118 return -EFAULT; 119 } 120 121 return ret; 122 } 123 124 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, 125 struct compat_timespec __user *rmtp) 126 { 127 struct timespec tu, rmt; 128 mm_segment_t oldfs; 129 long ret; 130 131 if (get_compat_timespec(&tu, rqtp)) 132 return -EFAULT; 133 134 if (!timespec_valid(&tu)) 135 return -EINVAL; 136 137 oldfs = get_fs(); 138 set_fs(KERNEL_DS); 139 ret = hrtimer_nanosleep(&tu, 140 rmtp ? (struct timespec __user *)&rmt : NULL, 141 HRTIMER_MODE_REL, CLOCK_MONOTONIC); 142 set_fs(oldfs); 143 144 if (ret) { 145 struct restart_block *restart 146 = ¤t_thread_info()->restart_block; 147 148 restart->fn = compat_nanosleep_restart; 149 restart->nanosleep.compat_rmtp = rmtp; 150 151 if (rmtp && put_compat_timespec(&rmt, rmtp)) 152 return -EFAULT; 153 } 154 155 return ret; 156 } 157 158 static inline long get_compat_itimerval(struct itimerval *o, 159 struct compat_itimerval __user *i) 160 { 161 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 162 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 163 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 164 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 165 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 166 } 167 168 static inline long put_compat_itimerval(struct compat_itimerval __user *o, 169 struct itimerval *i) 170 { 171 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 172 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 173 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 174 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 175 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 176 } 177 178 asmlinkage long compat_sys_getitimer(int which, 179 struct compat_itimerval __user *it) 180 { 181 struct itimerval kit; 182 int error; 183 184 error = do_getitimer(which, &kit); 185 if (!error && put_compat_itimerval(it, &kit)) 186 error = -EFAULT; 187 return error; 188 } 189 190 asmlinkage long compat_sys_setitimer(int which, 191 struct compat_itimerval __user *in, 192 struct compat_itimerval __user *out) 193 { 194 struct itimerval kin, kout; 195 int error; 196 197 if (in) { 198 if (get_compat_itimerval(&kin, in)) 199 return -EFAULT; 200 } else 201 memset(&kin, 0, sizeof(kin)); 202 203 error = do_setitimer(which, &kin, out ? &kout : NULL); 204 if (error || !out) 205 return error; 206 if (put_compat_itimerval(out, &kout)) 207 return -EFAULT; 208 return 0; 209 } 210 211 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) 212 { 213 /* 214 * In the SMP world we might just be unlucky and have one of 215 * the times increment as we use it. Since the value is an 216 * atomically safe type this is just fine. Conceptually its 217 * as if the syscall took an instant longer to occur. 218 */ 219 if (tbuf) { 220 struct compat_tms tmp; 221 struct task_struct *tsk = current; 222 struct task_struct *t; 223 cputime_t utime, stime, cutime, cstime; 224 225 read_lock(&tasklist_lock); 226 utime = tsk->signal->utime; 227 stime = tsk->signal->stime; 228 t = tsk; 229 do { 230 utime = cputime_add(utime, t->utime); 231 stime = cputime_add(stime, t->stime); 232 t = next_thread(t); 233 } while (t != tsk); 234 235 /* 236 * While we have tasklist_lock read-locked, no dying thread 237 * can be updating current->signal->[us]time. Instead, 238 * we got their counts included in the live thread loop. 239 * However, another thread can come in right now and 240 * do a wait call that updates current->signal->c[us]time. 241 * To make sure we always see that pair updated atomically, 242 * we take the siglock around fetching them. 243 */ 244 spin_lock_irq(&tsk->sighand->siglock); 245 cutime = tsk->signal->cutime; 246 cstime = tsk->signal->cstime; 247 spin_unlock_irq(&tsk->sighand->siglock); 248 read_unlock(&tasklist_lock); 249 250 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime)); 251 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime)); 252 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime)); 253 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime)); 254 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 255 return -EFAULT; 256 } 257 return compat_jiffies_to_clock_t(jiffies); 258 } 259 260 /* 261 * Assumption: old_sigset_t and compat_old_sigset_t are both 262 * types that can be passed to put_user()/get_user(). 263 */ 264 265 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) 266 { 267 old_sigset_t s; 268 long ret; 269 mm_segment_t old_fs = get_fs(); 270 271 set_fs(KERNEL_DS); 272 ret = sys_sigpending((old_sigset_t __user *) &s); 273 set_fs(old_fs); 274 if (ret == 0) 275 ret = put_user(s, set); 276 return ret; 277 } 278 279 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set, 280 compat_old_sigset_t __user *oset) 281 { 282 old_sigset_t s; 283 long ret; 284 mm_segment_t old_fs; 285 286 if (set && get_user(s, set)) 287 return -EFAULT; 288 old_fs = get_fs(); 289 set_fs(KERNEL_DS); 290 ret = sys_sigprocmask(how, 291 set ? (old_sigset_t __user *) &s : NULL, 292 oset ? (old_sigset_t __user *) &s : NULL); 293 set_fs(old_fs); 294 if (ret == 0) 295 if (oset) 296 ret = put_user(s, oset); 297 return ret; 298 } 299 300 asmlinkage long compat_sys_setrlimit(unsigned int resource, 301 struct compat_rlimit __user *rlim) 302 { 303 struct rlimit r; 304 int ret; 305 mm_segment_t old_fs = get_fs (); 306 307 if (resource >= RLIM_NLIMITS) 308 return -EINVAL; 309 310 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 311 __get_user(r.rlim_cur, &rlim->rlim_cur) || 312 __get_user(r.rlim_max, &rlim->rlim_max)) 313 return -EFAULT; 314 315 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 316 r.rlim_cur = RLIM_INFINITY; 317 if (r.rlim_max == COMPAT_RLIM_INFINITY) 318 r.rlim_max = RLIM_INFINITY; 319 set_fs(KERNEL_DS); 320 ret = sys_setrlimit(resource, (struct rlimit __user *) &r); 321 set_fs(old_fs); 322 return ret; 323 } 324 325 #ifdef COMPAT_RLIM_OLD_INFINITY 326 327 asmlinkage long compat_sys_old_getrlimit(unsigned int resource, 328 struct compat_rlimit __user *rlim) 329 { 330 struct rlimit r; 331 int ret; 332 mm_segment_t old_fs = get_fs(); 333 334 set_fs(KERNEL_DS); 335 ret = sys_old_getrlimit(resource, &r); 336 set_fs(old_fs); 337 338 if (!ret) { 339 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 340 r.rlim_cur = COMPAT_RLIM_INFINITY; 341 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 342 r.rlim_max = COMPAT_RLIM_INFINITY; 343 344 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 345 __put_user(r.rlim_cur, &rlim->rlim_cur) || 346 __put_user(r.rlim_max, &rlim->rlim_max)) 347 return -EFAULT; 348 } 349 return ret; 350 } 351 352 #endif 353 354 asmlinkage long compat_sys_getrlimit (unsigned int resource, 355 struct compat_rlimit __user *rlim) 356 { 357 struct rlimit r; 358 int ret; 359 mm_segment_t old_fs = get_fs(); 360 361 set_fs(KERNEL_DS); 362 ret = sys_getrlimit(resource, (struct rlimit __user *) &r); 363 set_fs(old_fs); 364 if (!ret) { 365 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 366 r.rlim_cur = COMPAT_RLIM_INFINITY; 367 if (r.rlim_max > COMPAT_RLIM_INFINITY) 368 r.rlim_max = COMPAT_RLIM_INFINITY; 369 370 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 371 __put_user(r.rlim_cur, &rlim->rlim_cur) || 372 __put_user(r.rlim_max, &rlim->rlim_max)) 373 return -EFAULT; 374 } 375 return ret; 376 } 377 378 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 379 { 380 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 381 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 382 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 383 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 384 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 385 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 386 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 387 __put_user(r->ru_idrss, &ru->ru_idrss) || 388 __put_user(r->ru_isrss, &ru->ru_isrss) || 389 __put_user(r->ru_minflt, &ru->ru_minflt) || 390 __put_user(r->ru_majflt, &ru->ru_majflt) || 391 __put_user(r->ru_nswap, &ru->ru_nswap) || 392 __put_user(r->ru_inblock, &ru->ru_inblock) || 393 __put_user(r->ru_oublock, &ru->ru_oublock) || 394 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 395 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 396 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 397 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 398 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 399 return -EFAULT; 400 return 0; 401 } 402 403 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) 404 { 405 struct rusage r; 406 int ret; 407 mm_segment_t old_fs = get_fs(); 408 409 set_fs(KERNEL_DS); 410 ret = sys_getrusage(who, (struct rusage __user *) &r); 411 set_fs(old_fs); 412 413 if (ret) 414 return ret; 415 416 if (put_compat_rusage(&r, ru)) 417 return -EFAULT; 418 419 return 0; 420 } 421 422 asmlinkage long 423 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, 424 struct compat_rusage __user *ru) 425 { 426 if (!ru) { 427 return sys_wait4(pid, stat_addr, options, NULL); 428 } else { 429 struct rusage r; 430 int ret; 431 unsigned int status; 432 mm_segment_t old_fs = get_fs(); 433 434 set_fs (KERNEL_DS); 435 ret = sys_wait4(pid, 436 (stat_addr ? 437 (unsigned int __user *) &status : NULL), 438 options, (struct rusage __user *) &r); 439 set_fs (old_fs); 440 441 if (ret > 0) { 442 if (put_compat_rusage(&r, ru)) 443 return -EFAULT; 444 if (stat_addr && put_user(status, stat_addr)) 445 return -EFAULT; 446 } 447 return ret; 448 } 449 } 450 451 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, 452 struct compat_siginfo __user *uinfo, int options, 453 struct compat_rusage __user *uru) 454 { 455 siginfo_t info; 456 struct rusage ru; 457 long ret; 458 mm_segment_t old_fs = get_fs(); 459 460 memset(&info, 0, sizeof(info)); 461 462 set_fs(KERNEL_DS); 463 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 464 uru ? (struct rusage __user *)&ru : NULL); 465 set_fs(old_fs); 466 467 if ((ret < 0) || (info.si_signo == 0)) 468 return ret; 469 470 if (uru) { 471 ret = put_compat_rusage(&ru, uru); 472 if (ret) 473 return ret; 474 } 475 476 BUG_ON(info.si_code & __SI_MASK); 477 info.si_code |= __SI_CHLD; 478 return copy_siginfo_to_user32(uinfo, &info); 479 } 480 481 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 482 unsigned len, cpumask_t *new_mask) 483 { 484 unsigned long *k; 485 486 if (len < sizeof(cpumask_t)) 487 memset(new_mask, 0, sizeof(cpumask_t)); 488 else if (len > sizeof(cpumask_t)) 489 len = sizeof(cpumask_t); 490 491 k = cpus_addr(*new_mask); 492 return compat_get_bitmap(k, user_mask_ptr, len * 8); 493 } 494 495 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 496 unsigned int len, 497 compat_ulong_t __user *user_mask_ptr) 498 { 499 cpumask_t new_mask; 500 int retval; 501 502 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask); 503 if (retval) 504 return retval; 505 506 return sched_setaffinity(pid, &new_mask); 507 } 508 509 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 510 compat_ulong_t __user *user_mask_ptr) 511 { 512 int ret; 513 cpumask_t mask; 514 unsigned long *k; 515 unsigned int min_length = sizeof(cpumask_t); 516 517 if (NR_CPUS <= BITS_PER_COMPAT_LONG) 518 min_length = sizeof(compat_ulong_t); 519 520 if (len < min_length) 521 return -EINVAL; 522 523 ret = sched_getaffinity(pid, &mask); 524 if (ret < 0) 525 return ret; 526 527 k = cpus_addr(mask); 528 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); 529 if (ret) 530 return ret; 531 532 return min_length; 533 } 534 535 int get_compat_itimerspec(struct itimerspec *dst, 536 const struct compat_itimerspec __user *src) 537 { 538 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 539 get_compat_timespec(&dst->it_value, &src->it_value)) 540 return -EFAULT; 541 return 0; 542 } 543 544 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 545 const struct itimerspec *src) 546 { 547 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 548 put_compat_timespec(&src->it_value, &dst->it_value)) 549 return -EFAULT; 550 return 0; 551 } 552 553 long compat_sys_timer_create(clockid_t which_clock, 554 struct compat_sigevent __user *timer_event_spec, 555 timer_t __user *created_timer_id) 556 { 557 struct sigevent __user *event = NULL; 558 559 if (timer_event_spec) { 560 struct sigevent kevent; 561 562 event = compat_alloc_user_space(sizeof(*event)); 563 if (get_compat_sigevent(&kevent, timer_event_spec) || 564 copy_to_user(event, &kevent, sizeof(*event))) 565 return -EFAULT; 566 } 567 568 return sys_timer_create(which_clock, event, created_timer_id); 569 } 570 571 long compat_sys_timer_settime(timer_t timer_id, int flags, 572 struct compat_itimerspec __user *new, 573 struct compat_itimerspec __user *old) 574 { 575 long err; 576 mm_segment_t oldfs; 577 struct itimerspec newts, oldts; 578 579 if (!new) 580 return -EINVAL; 581 if (get_compat_itimerspec(&newts, new)) 582 return -EFAULT; 583 oldfs = get_fs(); 584 set_fs(KERNEL_DS); 585 err = sys_timer_settime(timer_id, flags, 586 (struct itimerspec __user *) &newts, 587 (struct itimerspec __user *) &oldts); 588 set_fs(oldfs); 589 if (!err && old && put_compat_itimerspec(old, &oldts)) 590 return -EFAULT; 591 return err; 592 } 593 594 long compat_sys_timer_gettime(timer_t timer_id, 595 struct compat_itimerspec __user *setting) 596 { 597 long err; 598 mm_segment_t oldfs; 599 struct itimerspec ts; 600 601 oldfs = get_fs(); 602 set_fs(KERNEL_DS); 603 err = sys_timer_gettime(timer_id, 604 (struct itimerspec __user *) &ts); 605 set_fs(oldfs); 606 if (!err && put_compat_itimerspec(setting, &ts)) 607 return -EFAULT; 608 return err; 609 } 610 611 long compat_sys_clock_settime(clockid_t which_clock, 612 struct compat_timespec __user *tp) 613 { 614 long err; 615 mm_segment_t oldfs; 616 struct timespec ts; 617 618 if (get_compat_timespec(&ts, tp)) 619 return -EFAULT; 620 oldfs = get_fs(); 621 set_fs(KERNEL_DS); 622 err = sys_clock_settime(which_clock, 623 (struct timespec __user *) &ts); 624 set_fs(oldfs); 625 return err; 626 } 627 628 long compat_sys_clock_gettime(clockid_t which_clock, 629 struct compat_timespec __user *tp) 630 { 631 long err; 632 mm_segment_t oldfs; 633 struct timespec ts; 634 635 oldfs = get_fs(); 636 set_fs(KERNEL_DS); 637 err = sys_clock_gettime(which_clock, 638 (struct timespec __user *) &ts); 639 set_fs(oldfs); 640 if (!err && put_compat_timespec(&ts, tp)) 641 return -EFAULT; 642 return err; 643 } 644 645 long compat_sys_clock_getres(clockid_t which_clock, 646 struct compat_timespec __user *tp) 647 { 648 long err; 649 mm_segment_t oldfs; 650 struct timespec ts; 651 652 oldfs = get_fs(); 653 set_fs(KERNEL_DS); 654 err = sys_clock_getres(which_clock, 655 (struct timespec __user *) &ts); 656 set_fs(oldfs); 657 if (!err && tp && put_compat_timespec(&ts, tp)) 658 return -EFAULT; 659 return err; 660 } 661 662 static long compat_clock_nanosleep_restart(struct restart_block *restart) 663 { 664 long err; 665 mm_segment_t oldfs; 666 struct timespec tu; 667 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp; 668 669 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 670 oldfs = get_fs(); 671 set_fs(KERNEL_DS); 672 err = clock_nanosleep_restart(restart); 673 set_fs(oldfs); 674 675 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 676 put_compat_timespec(&tu, rmtp)) 677 return -EFAULT; 678 679 if (err == -ERESTART_RESTARTBLOCK) { 680 restart->fn = compat_clock_nanosleep_restart; 681 restart->nanosleep.compat_rmtp = rmtp; 682 } 683 return err; 684 } 685 686 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 687 struct compat_timespec __user *rqtp, 688 struct compat_timespec __user *rmtp) 689 { 690 long err; 691 mm_segment_t oldfs; 692 struct timespec in, out; 693 struct restart_block *restart; 694 695 if (get_compat_timespec(&in, rqtp)) 696 return -EFAULT; 697 698 oldfs = get_fs(); 699 set_fs(KERNEL_DS); 700 err = sys_clock_nanosleep(which_clock, flags, 701 (struct timespec __user *) &in, 702 (struct timespec __user *) &out); 703 set_fs(oldfs); 704 705 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 706 put_compat_timespec(&out, rmtp)) 707 return -EFAULT; 708 709 if (err == -ERESTART_RESTARTBLOCK) { 710 restart = ¤t_thread_info()->restart_block; 711 restart->fn = compat_clock_nanosleep_restart; 712 restart->nanosleep.compat_rmtp = rmtp; 713 } 714 return err; 715 } 716 717 /* 718 * We currently only need the following fields from the sigevent 719 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 720 * sigev_notify_thread_id). The others are handled in user mode. 721 * We also assume that copying sigev_value.sival_int is sufficient 722 * to keep all the bits of sigev_value.sival_ptr intact. 723 */ 724 int get_compat_sigevent(struct sigevent *event, 725 const struct compat_sigevent __user *u_event) 726 { 727 memset(event, 0, sizeof(*event)); 728 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 729 __get_user(event->sigev_value.sival_int, 730 &u_event->sigev_value.sival_int) || 731 __get_user(event->sigev_signo, &u_event->sigev_signo) || 732 __get_user(event->sigev_notify, &u_event->sigev_notify) || 733 __get_user(event->sigev_notify_thread_id, 734 &u_event->sigev_notify_thread_id)) 735 ? -EFAULT : 0; 736 } 737 738 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 739 unsigned long bitmap_size) 740 { 741 int i, j; 742 unsigned long m; 743 compat_ulong_t um; 744 unsigned long nr_compat_longs; 745 746 /* align bitmap up to nearest compat_long_t boundary */ 747 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 748 749 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 750 return -EFAULT; 751 752 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 753 754 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 755 m = 0; 756 757 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 758 /* 759 * We dont want to read past the end of the userspace 760 * bitmap. We must however ensure the end of the 761 * kernel bitmap is zeroed. 762 */ 763 if (nr_compat_longs-- > 0) { 764 if (__get_user(um, umask)) 765 return -EFAULT; 766 } else { 767 um = 0; 768 } 769 770 umask++; 771 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 772 } 773 *mask++ = m; 774 } 775 776 return 0; 777 } 778 779 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 780 unsigned long bitmap_size) 781 { 782 int i, j; 783 unsigned long m; 784 compat_ulong_t um; 785 unsigned long nr_compat_longs; 786 787 /* align bitmap up to nearest compat_long_t boundary */ 788 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 789 790 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 791 return -EFAULT; 792 793 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 794 795 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 796 m = *mask++; 797 798 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 799 um = m; 800 801 /* 802 * We dont want to write past the end of the userspace 803 * bitmap. 804 */ 805 if (nr_compat_longs-- > 0) { 806 if (__put_user(um, umask)) 807 return -EFAULT; 808 } 809 810 umask++; 811 m >>= 4*sizeof(um); 812 m >>= 4*sizeof(um); 813 } 814 } 815 816 return 0; 817 } 818 819 void 820 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 821 { 822 switch (_NSIG_WORDS) { 823 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 824 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 825 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 826 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 827 } 828 } 829 830 asmlinkage long 831 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 832 struct compat_siginfo __user *uinfo, 833 struct compat_timespec __user *uts, compat_size_t sigsetsize) 834 { 835 compat_sigset_t s32; 836 sigset_t s; 837 int sig; 838 struct timespec t; 839 siginfo_t info; 840 long ret, timeout = 0; 841 842 if (sigsetsize != sizeof(sigset_t)) 843 return -EINVAL; 844 845 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 846 return -EFAULT; 847 sigset_from_compat(&s, &s32); 848 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); 849 signotset(&s); 850 851 if (uts) { 852 if (get_compat_timespec (&t, uts)) 853 return -EFAULT; 854 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 855 || t.tv_sec < 0) 856 return -EINVAL; 857 } 858 859 spin_lock_irq(¤t->sighand->siglock); 860 sig = dequeue_signal(current, &s, &info); 861 if (!sig) { 862 timeout = MAX_SCHEDULE_TIMEOUT; 863 if (uts) 864 timeout = timespec_to_jiffies(&t) 865 +(t.tv_sec || t.tv_nsec); 866 if (timeout) { 867 current->real_blocked = current->blocked; 868 sigandsets(¤t->blocked, ¤t->blocked, &s); 869 870 recalc_sigpending(); 871 spin_unlock_irq(¤t->sighand->siglock); 872 873 timeout = schedule_timeout_interruptible(timeout); 874 875 spin_lock_irq(¤t->sighand->siglock); 876 sig = dequeue_signal(current, &s, &info); 877 current->blocked = current->real_blocked; 878 siginitset(¤t->real_blocked, 0); 879 recalc_sigpending(); 880 } 881 } 882 spin_unlock_irq(¤t->sighand->siglock); 883 884 if (sig) { 885 ret = sig; 886 if (uinfo) { 887 if (copy_siginfo_to_user32(uinfo, &info)) 888 ret = -EFAULT; 889 } 890 }else { 891 ret = timeout?-EINTR:-EAGAIN; 892 } 893 return ret; 894 895 } 896 897 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 898 899 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 900 901 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 902 { 903 compat_time_t i; 904 struct timeval tv; 905 906 do_gettimeofday(&tv); 907 i = tv.tv_sec; 908 909 if (tloc) { 910 if (put_user(i,tloc)) 911 i = -EFAULT; 912 } 913 return i; 914 } 915 916 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 917 { 918 struct timespec tv; 919 int err; 920 921 if (get_user(tv.tv_sec, tptr)) 922 return -EFAULT; 923 924 tv.tv_nsec = 0; 925 926 err = security_settime(&tv, NULL); 927 if (err) 928 return err; 929 930 do_settimeofday(&tv); 931 return 0; 932 } 933 934 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 935 936 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND 937 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) 938 { 939 sigset_t newset; 940 compat_sigset_t newset32; 941 942 /* XXX: Don't preclude handling different sized sigset_t's. */ 943 if (sigsetsize != sizeof(sigset_t)) 944 return -EINVAL; 945 946 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) 947 return -EFAULT; 948 sigset_from_compat(&newset, &newset32); 949 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 950 951 spin_lock_irq(¤t->sighand->siglock); 952 current->saved_sigmask = current->blocked; 953 current->blocked = newset; 954 recalc_sigpending(); 955 spin_unlock_irq(¤t->sighand->siglock); 956 957 current->state = TASK_INTERRUPTIBLE; 958 schedule(); 959 set_restore_sigmask(); 960 return -ERESTARTNOHAND; 961 } 962 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ 963 964 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) 965 { 966 struct timex txc; 967 int ret; 968 969 memset(&txc, 0, sizeof(struct timex)); 970 971 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || 972 __get_user(txc.modes, &utp->modes) || 973 __get_user(txc.offset, &utp->offset) || 974 __get_user(txc.freq, &utp->freq) || 975 __get_user(txc.maxerror, &utp->maxerror) || 976 __get_user(txc.esterror, &utp->esterror) || 977 __get_user(txc.status, &utp->status) || 978 __get_user(txc.constant, &utp->constant) || 979 __get_user(txc.precision, &utp->precision) || 980 __get_user(txc.tolerance, &utp->tolerance) || 981 __get_user(txc.time.tv_sec, &utp->time.tv_sec) || 982 __get_user(txc.time.tv_usec, &utp->time.tv_usec) || 983 __get_user(txc.tick, &utp->tick) || 984 __get_user(txc.ppsfreq, &utp->ppsfreq) || 985 __get_user(txc.jitter, &utp->jitter) || 986 __get_user(txc.shift, &utp->shift) || 987 __get_user(txc.stabil, &utp->stabil) || 988 __get_user(txc.jitcnt, &utp->jitcnt) || 989 __get_user(txc.calcnt, &utp->calcnt) || 990 __get_user(txc.errcnt, &utp->errcnt) || 991 __get_user(txc.stbcnt, &utp->stbcnt)) 992 return -EFAULT; 993 994 ret = do_adjtimex(&txc); 995 996 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || 997 __put_user(txc.modes, &utp->modes) || 998 __put_user(txc.offset, &utp->offset) || 999 __put_user(txc.freq, &utp->freq) || 1000 __put_user(txc.maxerror, &utp->maxerror) || 1001 __put_user(txc.esterror, &utp->esterror) || 1002 __put_user(txc.status, &utp->status) || 1003 __put_user(txc.constant, &utp->constant) || 1004 __put_user(txc.precision, &utp->precision) || 1005 __put_user(txc.tolerance, &utp->tolerance) || 1006 __put_user(txc.time.tv_sec, &utp->time.tv_sec) || 1007 __put_user(txc.time.tv_usec, &utp->time.tv_usec) || 1008 __put_user(txc.tick, &utp->tick) || 1009 __put_user(txc.ppsfreq, &utp->ppsfreq) || 1010 __put_user(txc.jitter, &utp->jitter) || 1011 __put_user(txc.shift, &utp->shift) || 1012 __put_user(txc.stabil, &utp->stabil) || 1013 __put_user(txc.jitcnt, &utp->jitcnt) || 1014 __put_user(txc.calcnt, &utp->calcnt) || 1015 __put_user(txc.errcnt, &utp->errcnt) || 1016 __put_user(txc.stbcnt, &utp->stbcnt) || 1017 __put_user(txc.tai, &utp->tai)) 1018 ret = -EFAULT; 1019 1020 return ret; 1021 } 1022 1023 #ifdef CONFIG_NUMA 1024 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages, 1025 compat_uptr_t __user *pages32, 1026 const int __user *nodes, 1027 int __user *status, 1028 int flags) 1029 { 1030 const void __user * __user *pages; 1031 int i; 1032 1033 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1034 for (i = 0; i < nr_pages; i++) { 1035 compat_uptr_t p; 1036 1037 if (get_user(p, pages32 + i) || 1038 put_user(compat_ptr(p), pages + i)) 1039 return -EFAULT; 1040 } 1041 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1042 } 1043 1044 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, 1045 compat_ulong_t maxnode, 1046 const compat_ulong_t __user *old_nodes, 1047 const compat_ulong_t __user *new_nodes) 1048 { 1049 unsigned long __user *old = NULL; 1050 unsigned long __user *new = NULL; 1051 nodemask_t tmp_mask; 1052 unsigned long nr_bits; 1053 unsigned long size; 1054 1055 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1056 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1057 if (old_nodes) { 1058 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1059 return -EFAULT; 1060 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1061 if (new_nodes) 1062 new = old + size / sizeof(unsigned long); 1063 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1064 return -EFAULT; 1065 } 1066 if (new_nodes) { 1067 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1068 return -EFAULT; 1069 if (new == NULL) 1070 new = compat_alloc_user_space(size); 1071 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1072 return -EFAULT; 1073 } 1074 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1075 } 1076 #endif 1077 1078 struct compat_sysinfo { 1079 s32 uptime; 1080 u32 loads[3]; 1081 u32 totalram; 1082 u32 freeram; 1083 u32 sharedram; 1084 u32 bufferram; 1085 u32 totalswap; 1086 u32 freeswap; 1087 u16 procs; 1088 u16 pad; 1089 u32 totalhigh; 1090 u32 freehigh; 1091 u32 mem_unit; 1092 char _f[20-2*sizeof(u32)-sizeof(int)]; 1093 }; 1094 1095 asmlinkage long 1096 compat_sys_sysinfo(struct compat_sysinfo __user *info) 1097 { 1098 struct sysinfo s; 1099 1100 do_sysinfo(&s); 1101 1102 /* Check to see if any memory value is too large for 32-bit and scale 1103 * down if needed 1104 */ 1105 if ((s.totalram >> 32) || (s.totalswap >> 32)) { 1106 int bitcount = 0; 1107 1108 while (s.mem_unit < PAGE_SIZE) { 1109 s.mem_unit <<= 1; 1110 bitcount++; 1111 } 1112 1113 s.totalram >>= bitcount; 1114 s.freeram >>= bitcount; 1115 s.sharedram >>= bitcount; 1116 s.bufferram >>= bitcount; 1117 s.totalswap >>= bitcount; 1118 s.freeswap >>= bitcount; 1119 s.totalhigh >>= bitcount; 1120 s.freehigh >>= bitcount; 1121 } 1122 1123 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || 1124 __put_user (s.uptime, &info->uptime) || 1125 __put_user (s.loads[0], &info->loads[0]) || 1126 __put_user (s.loads[1], &info->loads[1]) || 1127 __put_user (s.loads[2], &info->loads[2]) || 1128 __put_user (s.totalram, &info->totalram) || 1129 __put_user (s.freeram, &info->freeram) || 1130 __put_user (s.sharedram, &info->sharedram) || 1131 __put_user (s.bufferram, &info->bufferram) || 1132 __put_user (s.totalswap, &info->totalswap) || 1133 __put_user (s.freeswap, &info->freeswap) || 1134 __put_user (s.procs, &info->procs) || 1135 __put_user (s.totalhigh, &info->totalhigh) || 1136 __put_user (s.freehigh, &info->freehigh) || 1137 __put_user (s.mem_unit, &info->mem_unit)) 1138 return -EFAULT; 1139 1140 return 0; 1141 } 1142