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, struct cpumask *new_mask) 458 { 459 unsigned long *k; 460 461 if (len < cpumask_size()) 462 memset(new_mask, 0, cpumask_size()); 463 else if (len > cpumask_size()) 464 len = cpumask_size(); 465 466 k = cpumask_bits(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_var_t new_mask; 475 int retval; 476 477 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 478 return -ENOMEM; 479 480 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 481 if (retval) 482 goto out; 483 484 retval = sched_setaffinity(pid, new_mask); 485 out: 486 free_cpumask_var(new_mask); 487 return retval; 488 } 489 490 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 491 compat_ulong_t __user *user_mask_ptr) 492 { 493 int ret; 494 cpumask_var_t mask; 495 unsigned long *k; 496 unsigned int min_length = cpumask_size(); 497 498 if (nr_cpu_ids <= BITS_PER_COMPAT_LONG) 499 min_length = sizeof(compat_ulong_t); 500 501 if (len < min_length) 502 return -EINVAL; 503 504 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 505 return -ENOMEM; 506 507 ret = sched_getaffinity(pid, mask); 508 if (ret < 0) 509 goto out; 510 511 k = cpumask_bits(mask); 512 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); 513 if (ret == 0) 514 ret = min_length; 515 516 out: 517 free_cpumask_var(mask); 518 return ret; 519 } 520 521 int get_compat_itimerspec(struct itimerspec *dst, 522 const struct compat_itimerspec __user *src) 523 { 524 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 525 get_compat_timespec(&dst->it_value, &src->it_value)) 526 return -EFAULT; 527 return 0; 528 } 529 530 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 531 const struct itimerspec *src) 532 { 533 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 534 put_compat_timespec(&src->it_value, &dst->it_value)) 535 return -EFAULT; 536 return 0; 537 } 538 539 long compat_sys_timer_create(clockid_t which_clock, 540 struct compat_sigevent __user *timer_event_spec, 541 timer_t __user *created_timer_id) 542 { 543 struct sigevent __user *event = NULL; 544 545 if (timer_event_spec) { 546 struct sigevent kevent; 547 548 event = compat_alloc_user_space(sizeof(*event)); 549 if (get_compat_sigevent(&kevent, timer_event_spec) || 550 copy_to_user(event, &kevent, sizeof(*event))) 551 return -EFAULT; 552 } 553 554 return sys_timer_create(which_clock, event, created_timer_id); 555 } 556 557 long compat_sys_timer_settime(timer_t timer_id, int flags, 558 struct compat_itimerspec __user *new, 559 struct compat_itimerspec __user *old) 560 { 561 long err; 562 mm_segment_t oldfs; 563 struct itimerspec newts, oldts; 564 565 if (!new) 566 return -EINVAL; 567 if (get_compat_itimerspec(&newts, new)) 568 return -EFAULT; 569 oldfs = get_fs(); 570 set_fs(KERNEL_DS); 571 err = sys_timer_settime(timer_id, flags, 572 (struct itimerspec __user *) &newts, 573 (struct itimerspec __user *) &oldts); 574 set_fs(oldfs); 575 if (!err && old && put_compat_itimerspec(old, &oldts)) 576 return -EFAULT; 577 return err; 578 } 579 580 long compat_sys_timer_gettime(timer_t timer_id, 581 struct compat_itimerspec __user *setting) 582 { 583 long err; 584 mm_segment_t oldfs; 585 struct itimerspec ts; 586 587 oldfs = get_fs(); 588 set_fs(KERNEL_DS); 589 err = sys_timer_gettime(timer_id, 590 (struct itimerspec __user *) &ts); 591 set_fs(oldfs); 592 if (!err && put_compat_itimerspec(setting, &ts)) 593 return -EFAULT; 594 return err; 595 } 596 597 long compat_sys_clock_settime(clockid_t which_clock, 598 struct compat_timespec __user *tp) 599 { 600 long err; 601 mm_segment_t oldfs; 602 struct timespec ts; 603 604 if (get_compat_timespec(&ts, tp)) 605 return -EFAULT; 606 oldfs = get_fs(); 607 set_fs(KERNEL_DS); 608 err = sys_clock_settime(which_clock, 609 (struct timespec __user *) &ts); 610 set_fs(oldfs); 611 return err; 612 } 613 614 long compat_sys_clock_gettime(clockid_t which_clock, 615 struct compat_timespec __user *tp) 616 { 617 long err; 618 mm_segment_t oldfs; 619 struct timespec ts; 620 621 oldfs = get_fs(); 622 set_fs(KERNEL_DS); 623 err = sys_clock_gettime(which_clock, 624 (struct timespec __user *) &ts); 625 set_fs(oldfs); 626 if (!err && put_compat_timespec(&ts, tp)) 627 return -EFAULT; 628 return err; 629 } 630 631 long compat_sys_clock_getres(clockid_t which_clock, 632 struct compat_timespec __user *tp) 633 { 634 long err; 635 mm_segment_t oldfs; 636 struct timespec ts; 637 638 oldfs = get_fs(); 639 set_fs(KERNEL_DS); 640 err = sys_clock_getres(which_clock, 641 (struct timespec __user *) &ts); 642 set_fs(oldfs); 643 if (!err && tp && put_compat_timespec(&ts, tp)) 644 return -EFAULT; 645 return err; 646 } 647 648 static long compat_clock_nanosleep_restart(struct restart_block *restart) 649 { 650 long err; 651 mm_segment_t oldfs; 652 struct timespec tu; 653 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp; 654 655 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 656 oldfs = get_fs(); 657 set_fs(KERNEL_DS); 658 err = clock_nanosleep_restart(restart); 659 set_fs(oldfs); 660 661 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 662 put_compat_timespec(&tu, rmtp)) 663 return -EFAULT; 664 665 if (err == -ERESTART_RESTARTBLOCK) { 666 restart->fn = compat_clock_nanosleep_restart; 667 restart->nanosleep.compat_rmtp = rmtp; 668 } 669 return err; 670 } 671 672 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 673 struct compat_timespec __user *rqtp, 674 struct compat_timespec __user *rmtp) 675 { 676 long err; 677 mm_segment_t oldfs; 678 struct timespec in, out; 679 struct restart_block *restart; 680 681 if (get_compat_timespec(&in, rqtp)) 682 return -EFAULT; 683 684 oldfs = get_fs(); 685 set_fs(KERNEL_DS); 686 err = sys_clock_nanosleep(which_clock, flags, 687 (struct timespec __user *) &in, 688 (struct timespec __user *) &out); 689 set_fs(oldfs); 690 691 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 692 put_compat_timespec(&out, rmtp)) 693 return -EFAULT; 694 695 if (err == -ERESTART_RESTARTBLOCK) { 696 restart = ¤t_thread_info()->restart_block; 697 restart->fn = compat_clock_nanosleep_restart; 698 restart->nanosleep.compat_rmtp = rmtp; 699 } 700 return err; 701 } 702 703 /* 704 * We currently only need the following fields from the sigevent 705 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 706 * sigev_notify_thread_id). The others are handled in user mode. 707 * We also assume that copying sigev_value.sival_int is sufficient 708 * to keep all the bits of sigev_value.sival_ptr intact. 709 */ 710 int get_compat_sigevent(struct sigevent *event, 711 const struct compat_sigevent __user *u_event) 712 { 713 memset(event, 0, sizeof(*event)); 714 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 715 __get_user(event->sigev_value.sival_int, 716 &u_event->sigev_value.sival_int) || 717 __get_user(event->sigev_signo, &u_event->sigev_signo) || 718 __get_user(event->sigev_notify, &u_event->sigev_notify) || 719 __get_user(event->sigev_notify_thread_id, 720 &u_event->sigev_notify_thread_id)) 721 ? -EFAULT : 0; 722 } 723 724 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 725 unsigned long bitmap_size) 726 { 727 int i, j; 728 unsigned long m; 729 compat_ulong_t um; 730 unsigned long nr_compat_longs; 731 732 /* align bitmap up to nearest compat_long_t boundary */ 733 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 734 735 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 736 return -EFAULT; 737 738 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 739 740 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 741 m = 0; 742 743 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 744 /* 745 * We dont want to read past the end of the userspace 746 * bitmap. We must however ensure the end of the 747 * kernel bitmap is zeroed. 748 */ 749 if (nr_compat_longs-- > 0) { 750 if (__get_user(um, umask)) 751 return -EFAULT; 752 } else { 753 um = 0; 754 } 755 756 umask++; 757 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 758 } 759 *mask++ = m; 760 } 761 762 return 0; 763 } 764 765 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 766 unsigned long bitmap_size) 767 { 768 int i, j; 769 unsigned long m; 770 compat_ulong_t um; 771 unsigned long nr_compat_longs; 772 773 /* align bitmap up to nearest compat_long_t boundary */ 774 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 775 776 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 777 return -EFAULT; 778 779 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 780 781 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 782 m = *mask++; 783 784 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 785 um = m; 786 787 /* 788 * We dont want to write past the end of the userspace 789 * bitmap. 790 */ 791 if (nr_compat_longs-- > 0) { 792 if (__put_user(um, umask)) 793 return -EFAULT; 794 } 795 796 umask++; 797 m >>= 4*sizeof(um); 798 m >>= 4*sizeof(um); 799 } 800 } 801 802 return 0; 803 } 804 805 void 806 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 807 { 808 switch (_NSIG_WORDS) { 809 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 810 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 811 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 812 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 813 } 814 } 815 816 asmlinkage long 817 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 818 struct compat_siginfo __user *uinfo, 819 struct compat_timespec __user *uts, compat_size_t sigsetsize) 820 { 821 compat_sigset_t s32; 822 sigset_t s; 823 int sig; 824 struct timespec t; 825 siginfo_t info; 826 long ret, timeout = 0; 827 828 if (sigsetsize != sizeof(sigset_t)) 829 return -EINVAL; 830 831 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 832 return -EFAULT; 833 sigset_from_compat(&s, &s32); 834 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); 835 signotset(&s); 836 837 if (uts) { 838 if (get_compat_timespec (&t, uts)) 839 return -EFAULT; 840 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 841 || t.tv_sec < 0) 842 return -EINVAL; 843 } 844 845 spin_lock_irq(¤t->sighand->siglock); 846 sig = dequeue_signal(current, &s, &info); 847 if (!sig) { 848 timeout = MAX_SCHEDULE_TIMEOUT; 849 if (uts) 850 timeout = timespec_to_jiffies(&t) 851 +(t.tv_sec || t.tv_nsec); 852 if (timeout) { 853 current->real_blocked = current->blocked; 854 sigandsets(¤t->blocked, ¤t->blocked, &s); 855 856 recalc_sigpending(); 857 spin_unlock_irq(¤t->sighand->siglock); 858 859 timeout = schedule_timeout_interruptible(timeout); 860 861 spin_lock_irq(¤t->sighand->siglock); 862 sig = dequeue_signal(current, &s, &info); 863 current->blocked = current->real_blocked; 864 siginitset(¤t->real_blocked, 0); 865 recalc_sigpending(); 866 } 867 } 868 spin_unlock_irq(¤t->sighand->siglock); 869 870 if (sig) { 871 ret = sig; 872 if (uinfo) { 873 if (copy_siginfo_to_user32(uinfo, &info)) 874 ret = -EFAULT; 875 } 876 }else { 877 ret = timeout?-EINTR:-EAGAIN; 878 } 879 return ret; 880 881 } 882 883 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 884 885 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 886 887 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 888 { 889 compat_time_t i; 890 struct timeval tv; 891 892 do_gettimeofday(&tv); 893 i = tv.tv_sec; 894 895 if (tloc) { 896 if (put_user(i,tloc)) 897 i = -EFAULT; 898 } 899 return i; 900 } 901 902 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 903 { 904 struct timespec tv; 905 int err; 906 907 if (get_user(tv.tv_sec, tptr)) 908 return -EFAULT; 909 910 tv.tv_nsec = 0; 911 912 err = security_settime(&tv, NULL); 913 if (err) 914 return err; 915 916 do_settimeofday(&tv); 917 return 0; 918 } 919 920 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 921 922 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND 923 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) 924 { 925 sigset_t newset; 926 compat_sigset_t newset32; 927 928 /* XXX: Don't preclude handling different sized sigset_t's. */ 929 if (sigsetsize != sizeof(sigset_t)) 930 return -EINVAL; 931 932 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) 933 return -EFAULT; 934 sigset_from_compat(&newset, &newset32); 935 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 936 937 spin_lock_irq(¤t->sighand->siglock); 938 current->saved_sigmask = current->blocked; 939 current->blocked = newset; 940 recalc_sigpending(); 941 spin_unlock_irq(¤t->sighand->siglock); 942 943 current->state = TASK_INTERRUPTIBLE; 944 schedule(); 945 set_restore_sigmask(); 946 return -ERESTARTNOHAND; 947 } 948 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ 949 950 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) 951 { 952 struct timex txc; 953 int ret; 954 955 memset(&txc, 0, sizeof(struct timex)); 956 957 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || 958 __get_user(txc.modes, &utp->modes) || 959 __get_user(txc.offset, &utp->offset) || 960 __get_user(txc.freq, &utp->freq) || 961 __get_user(txc.maxerror, &utp->maxerror) || 962 __get_user(txc.esterror, &utp->esterror) || 963 __get_user(txc.status, &utp->status) || 964 __get_user(txc.constant, &utp->constant) || 965 __get_user(txc.precision, &utp->precision) || 966 __get_user(txc.tolerance, &utp->tolerance) || 967 __get_user(txc.time.tv_sec, &utp->time.tv_sec) || 968 __get_user(txc.time.tv_usec, &utp->time.tv_usec) || 969 __get_user(txc.tick, &utp->tick) || 970 __get_user(txc.ppsfreq, &utp->ppsfreq) || 971 __get_user(txc.jitter, &utp->jitter) || 972 __get_user(txc.shift, &utp->shift) || 973 __get_user(txc.stabil, &utp->stabil) || 974 __get_user(txc.jitcnt, &utp->jitcnt) || 975 __get_user(txc.calcnt, &utp->calcnt) || 976 __get_user(txc.errcnt, &utp->errcnt) || 977 __get_user(txc.stbcnt, &utp->stbcnt)) 978 return -EFAULT; 979 980 ret = do_adjtimex(&txc); 981 982 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || 983 __put_user(txc.modes, &utp->modes) || 984 __put_user(txc.offset, &utp->offset) || 985 __put_user(txc.freq, &utp->freq) || 986 __put_user(txc.maxerror, &utp->maxerror) || 987 __put_user(txc.esterror, &utp->esterror) || 988 __put_user(txc.status, &utp->status) || 989 __put_user(txc.constant, &utp->constant) || 990 __put_user(txc.precision, &utp->precision) || 991 __put_user(txc.tolerance, &utp->tolerance) || 992 __put_user(txc.time.tv_sec, &utp->time.tv_sec) || 993 __put_user(txc.time.tv_usec, &utp->time.tv_usec) || 994 __put_user(txc.tick, &utp->tick) || 995 __put_user(txc.ppsfreq, &utp->ppsfreq) || 996 __put_user(txc.jitter, &utp->jitter) || 997 __put_user(txc.shift, &utp->shift) || 998 __put_user(txc.stabil, &utp->stabil) || 999 __put_user(txc.jitcnt, &utp->jitcnt) || 1000 __put_user(txc.calcnt, &utp->calcnt) || 1001 __put_user(txc.errcnt, &utp->errcnt) || 1002 __put_user(txc.stbcnt, &utp->stbcnt) || 1003 __put_user(txc.tai, &utp->tai)) 1004 ret = -EFAULT; 1005 1006 return ret; 1007 } 1008 1009 #ifdef CONFIG_NUMA 1010 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages, 1011 compat_uptr_t __user *pages32, 1012 const int __user *nodes, 1013 int __user *status, 1014 int flags) 1015 { 1016 const void __user * __user *pages; 1017 int i; 1018 1019 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1020 for (i = 0; i < nr_pages; i++) { 1021 compat_uptr_t p; 1022 1023 if (get_user(p, pages32 + i) || 1024 put_user(compat_ptr(p), pages + i)) 1025 return -EFAULT; 1026 } 1027 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1028 } 1029 1030 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, 1031 compat_ulong_t maxnode, 1032 const compat_ulong_t __user *old_nodes, 1033 const compat_ulong_t __user *new_nodes) 1034 { 1035 unsigned long __user *old = NULL; 1036 unsigned long __user *new = NULL; 1037 nodemask_t tmp_mask; 1038 unsigned long nr_bits; 1039 unsigned long size; 1040 1041 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1042 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1043 if (old_nodes) { 1044 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1045 return -EFAULT; 1046 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1047 if (new_nodes) 1048 new = old + size / sizeof(unsigned long); 1049 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1050 return -EFAULT; 1051 } 1052 if (new_nodes) { 1053 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1054 return -EFAULT; 1055 if (new == NULL) 1056 new = compat_alloc_user_space(size); 1057 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1058 return -EFAULT; 1059 } 1060 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1061 } 1062 #endif 1063 1064 struct compat_sysinfo { 1065 s32 uptime; 1066 u32 loads[3]; 1067 u32 totalram; 1068 u32 freeram; 1069 u32 sharedram; 1070 u32 bufferram; 1071 u32 totalswap; 1072 u32 freeswap; 1073 u16 procs; 1074 u16 pad; 1075 u32 totalhigh; 1076 u32 freehigh; 1077 u32 mem_unit; 1078 char _f[20-2*sizeof(u32)-sizeof(int)]; 1079 }; 1080 1081 asmlinkage long 1082 compat_sys_sysinfo(struct compat_sysinfo __user *info) 1083 { 1084 struct sysinfo s; 1085 1086 do_sysinfo(&s); 1087 1088 /* Check to see if any memory value is too large for 32-bit and scale 1089 * down if needed 1090 */ 1091 if ((s.totalram >> 32) || (s.totalswap >> 32)) { 1092 int bitcount = 0; 1093 1094 while (s.mem_unit < PAGE_SIZE) { 1095 s.mem_unit <<= 1; 1096 bitcount++; 1097 } 1098 1099 s.totalram >>= bitcount; 1100 s.freeram >>= bitcount; 1101 s.sharedram >>= bitcount; 1102 s.bufferram >>= bitcount; 1103 s.totalswap >>= bitcount; 1104 s.freeswap >>= bitcount; 1105 s.totalhigh >>= bitcount; 1106 s.freehigh >>= bitcount; 1107 } 1108 1109 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || 1110 __put_user (s.uptime, &info->uptime) || 1111 __put_user (s.loads[0], &info->loads[0]) || 1112 __put_user (s.loads[1], &info->loads[1]) || 1113 __put_user (s.loads[2], &info->loads[2]) || 1114 __put_user (s.totalram, &info->totalram) || 1115 __put_user (s.freeram, &info->freeram) || 1116 __put_user (s.sharedram, &info->sharedram) || 1117 __put_user (s.bufferram, &info->bufferram) || 1118 __put_user (s.totalswap, &info->totalswap) || 1119 __put_user (s.freeswap, &info->freeswap) || 1120 __put_user (s.procs, &info->procs) || 1121 __put_user (s.totalhigh, &info->totalhigh) || 1122 __put_user (s.freehigh, &info->freehigh) || 1123 __put_user (s.mem_unit, &info->mem_unit)) 1124 return -EFAULT; 1125 1126 return 0; 1127 } 1128