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