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 #include <linux/ptrace.h> 28 #include <linux/gfp.h> 29 30 #include <asm/uaccess.h> 31 32 /* 33 * Note that the native side is already converted to a timespec, because 34 * that's what we want anyway. 35 */ 36 static int compat_get_timeval(struct timespec *o, 37 struct compat_timeval __user *i) 38 { 39 long usec; 40 41 if (get_user(o->tv_sec, &i->tv_sec) || 42 get_user(usec, &i->tv_usec)) 43 return -EFAULT; 44 o->tv_nsec = usec * 1000; 45 return 0; 46 } 47 48 static int compat_put_timeval(struct compat_timeval __user *o, 49 struct timeval *i) 50 { 51 return (put_user(i->tv_sec, &o->tv_sec) || 52 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0; 53 } 54 55 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv, 56 struct timezone __user *tz) 57 { 58 if (tv) { 59 struct timeval ktv; 60 do_gettimeofday(&ktv); 61 if (compat_put_timeval(tv, &ktv)) 62 return -EFAULT; 63 } 64 if (tz) { 65 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) 66 return -EFAULT; 67 } 68 69 return 0; 70 } 71 72 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv, 73 struct timezone __user *tz) 74 { 75 struct timespec kts; 76 struct timezone ktz; 77 78 if (tv) { 79 if (compat_get_timeval(&kts, tv)) 80 return -EFAULT; 81 } 82 if (tz) { 83 if (copy_from_user(&ktz, tz, sizeof(ktz))) 84 return -EFAULT; 85 } 86 87 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL); 88 } 89 90 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts) 91 { 92 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || 93 __get_user(ts->tv_sec, &cts->tv_sec) || 94 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 95 } 96 97 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts) 98 { 99 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || 100 __put_user(ts->tv_sec, &cts->tv_sec) || 101 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 102 } 103 104 static long compat_nanosleep_restart(struct restart_block *restart) 105 { 106 struct compat_timespec __user *rmtp; 107 struct timespec rmt; 108 mm_segment_t oldfs; 109 long ret; 110 111 restart->nanosleep.rmtp = (struct timespec __user *) &rmt; 112 oldfs = get_fs(); 113 set_fs(KERNEL_DS); 114 ret = hrtimer_nanosleep_restart(restart); 115 set_fs(oldfs); 116 117 if (ret) { 118 rmtp = restart->nanosleep.compat_rmtp; 119 120 if (rmtp && put_compat_timespec(&rmt, rmtp)) 121 return -EFAULT; 122 } 123 124 return ret; 125 } 126 127 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, 128 struct compat_timespec __user *rmtp) 129 { 130 struct timespec tu, rmt; 131 mm_segment_t oldfs; 132 long ret; 133 134 if (get_compat_timespec(&tu, rqtp)) 135 return -EFAULT; 136 137 if (!timespec_valid(&tu)) 138 return -EINVAL; 139 140 oldfs = get_fs(); 141 set_fs(KERNEL_DS); 142 ret = hrtimer_nanosleep(&tu, 143 rmtp ? (struct timespec __user *)&rmt : NULL, 144 HRTIMER_MODE_REL, CLOCK_MONOTONIC); 145 set_fs(oldfs); 146 147 if (ret) { 148 struct restart_block *restart 149 = ¤t_thread_info()->restart_block; 150 151 restart->fn = compat_nanosleep_restart; 152 restart->nanosleep.compat_rmtp = rmtp; 153 154 if (rmtp && put_compat_timespec(&rmt, rmtp)) 155 return -EFAULT; 156 } 157 158 return ret; 159 } 160 161 static inline long get_compat_itimerval(struct itimerval *o, 162 struct compat_itimerval __user *i) 163 { 164 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 165 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 166 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 167 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 168 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 169 } 170 171 static inline long put_compat_itimerval(struct compat_itimerval __user *o, 172 struct itimerval *i) 173 { 174 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 175 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 176 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 177 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 178 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 179 } 180 181 asmlinkage long compat_sys_getitimer(int which, 182 struct compat_itimerval __user *it) 183 { 184 struct itimerval kit; 185 int error; 186 187 error = do_getitimer(which, &kit); 188 if (!error && put_compat_itimerval(it, &kit)) 189 error = -EFAULT; 190 return error; 191 } 192 193 asmlinkage long compat_sys_setitimer(int which, 194 struct compat_itimerval __user *in, 195 struct compat_itimerval __user *out) 196 { 197 struct itimerval kin, kout; 198 int error; 199 200 if (in) { 201 if (get_compat_itimerval(&kin, in)) 202 return -EFAULT; 203 } else 204 memset(&kin, 0, sizeof(kin)); 205 206 error = do_setitimer(which, &kin, out ? &kout : NULL); 207 if (error || !out) 208 return error; 209 if (put_compat_itimerval(out, &kout)) 210 return -EFAULT; 211 return 0; 212 } 213 214 static compat_clock_t clock_t_to_compat_clock_t(clock_t x) 215 { 216 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); 217 } 218 219 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) 220 { 221 if (tbuf) { 222 struct tms tms; 223 struct compat_tms tmp; 224 225 do_sys_times(&tms); 226 /* Convert our struct tms to the compat version. */ 227 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); 228 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); 229 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); 230 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); 231 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 232 return -EFAULT; 233 } 234 force_successful_syscall_return(); 235 return compat_jiffies_to_clock_t(jiffies); 236 } 237 238 /* 239 * Assumption: old_sigset_t and compat_old_sigset_t are both 240 * types that can be passed to put_user()/get_user(). 241 */ 242 243 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) 244 { 245 old_sigset_t s; 246 long ret; 247 mm_segment_t old_fs = get_fs(); 248 249 set_fs(KERNEL_DS); 250 ret = sys_sigpending((old_sigset_t __user *) &s); 251 set_fs(old_fs); 252 if (ret == 0) 253 ret = put_user(s, set); 254 return ret; 255 } 256 257 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set, 258 compat_old_sigset_t __user *oset) 259 { 260 old_sigset_t s; 261 long ret; 262 mm_segment_t old_fs; 263 264 if (set && get_user(s, set)) 265 return -EFAULT; 266 old_fs = get_fs(); 267 set_fs(KERNEL_DS); 268 ret = sys_sigprocmask(how, 269 set ? (old_sigset_t __user *) &s : NULL, 270 oset ? (old_sigset_t __user *) &s : NULL); 271 set_fs(old_fs); 272 if (ret == 0) 273 if (oset) 274 ret = put_user(s, oset); 275 return ret; 276 } 277 278 asmlinkage long compat_sys_setrlimit(unsigned int resource, 279 struct compat_rlimit __user *rlim) 280 { 281 struct rlimit r; 282 int ret; 283 mm_segment_t old_fs = get_fs (); 284 285 if (resource >= RLIM_NLIMITS) 286 return -EINVAL; 287 288 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 289 __get_user(r.rlim_cur, &rlim->rlim_cur) || 290 __get_user(r.rlim_max, &rlim->rlim_max)) 291 return -EFAULT; 292 293 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 294 r.rlim_cur = RLIM_INFINITY; 295 if (r.rlim_max == COMPAT_RLIM_INFINITY) 296 r.rlim_max = RLIM_INFINITY; 297 set_fs(KERNEL_DS); 298 ret = sys_setrlimit(resource, (struct rlimit __user *) &r); 299 set_fs(old_fs); 300 return ret; 301 } 302 303 #ifdef COMPAT_RLIM_OLD_INFINITY 304 305 asmlinkage long compat_sys_old_getrlimit(unsigned int resource, 306 struct compat_rlimit __user *rlim) 307 { 308 struct rlimit r; 309 int ret; 310 mm_segment_t old_fs = get_fs(); 311 312 set_fs(KERNEL_DS); 313 ret = sys_old_getrlimit(resource, &r); 314 set_fs(old_fs); 315 316 if (!ret) { 317 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 318 r.rlim_cur = COMPAT_RLIM_INFINITY; 319 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 320 r.rlim_max = COMPAT_RLIM_INFINITY; 321 322 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 323 __put_user(r.rlim_cur, &rlim->rlim_cur) || 324 __put_user(r.rlim_max, &rlim->rlim_max)) 325 return -EFAULT; 326 } 327 return ret; 328 } 329 330 #endif 331 332 asmlinkage long compat_sys_getrlimit (unsigned int resource, 333 struct compat_rlimit __user *rlim) 334 { 335 struct rlimit r; 336 int ret; 337 mm_segment_t old_fs = get_fs(); 338 339 set_fs(KERNEL_DS); 340 ret = sys_getrlimit(resource, (struct rlimit __user *) &r); 341 set_fs(old_fs); 342 if (!ret) { 343 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 344 r.rlim_cur = COMPAT_RLIM_INFINITY; 345 if (r.rlim_max > COMPAT_RLIM_INFINITY) 346 r.rlim_max = COMPAT_RLIM_INFINITY; 347 348 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 349 __put_user(r.rlim_cur, &rlim->rlim_cur) || 350 __put_user(r.rlim_max, &rlim->rlim_max)) 351 return -EFAULT; 352 } 353 return ret; 354 } 355 356 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 357 { 358 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 359 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 360 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 361 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 362 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 363 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 364 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 365 __put_user(r->ru_idrss, &ru->ru_idrss) || 366 __put_user(r->ru_isrss, &ru->ru_isrss) || 367 __put_user(r->ru_minflt, &ru->ru_minflt) || 368 __put_user(r->ru_majflt, &ru->ru_majflt) || 369 __put_user(r->ru_nswap, &ru->ru_nswap) || 370 __put_user(r->ru_inblock, &ru->ru_inblock) || 371 __put_user(r->ru_oublock, &ru->ru_oublock) || 372 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 373 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 374 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 375 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 376 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 377 return -EFAULT; 378 return 0; 379 } 380 381 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) 382 { 383 struct rusage r; 384 int ret; 385 mm_segment_t old_fs = get_fs(); 386 387 set_fs(KERNEL_DS); 388 ret = sys_getrusage(who, (struct rusage __user *) &r); 389 set_fs(old_fs); 390 391 if (ret) 392 return ret; 393 394 if (put_compat_rusage(&r, ru)) 395 return -EFAULT; 396 397 return 0; 398 } 399 400 asmlinkage long 401 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, 402 struct compat_rusage __user *ru) 403 { 404 if (!ru) { 405 return sys_wait4(pid, stat_addr, options, NULL); 406 } else { 407 struct rusage r; 408 int ret; 409 unsigned int status; 410 mm_segment_t old_fs = get_fs(); 411 412 set_fs (KERNEL_DS); 413 ret = sys_wait4(pid, 414 (stat_addr ? 415 (unsigned int __user *) &status : NULL), 416 options, (struct rusage __user *) &r); 417 set_fs (old_fs); 418 419 if (ret > 0) { 420 if (put_compat_rusage(&r, ru)) 421 return -EFAULT; 422 if (stat_addr && put_user(status, stat_addr)) 423 return -EFAULT; 424 } 425 return ret; 426 } 427 } 428 429 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, 430 struct compat_siginfo __user *uinfo, int options, 431 struct compat_rusage __user *uru) 432 { 433 siginfo_t info; 434 struct rusage ru; 435 long ret; 436 mm_segment_t old_fs = get_fs(); 437 438 memset(&info, 0, sizeof(info)); 439 440 set_fs(KERNEL_DS); 441 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 442 uru ? (struct rusage __user *)&ru : NULL); 443 set_fs(old_fs); 444 445 if ((ret < 0) || (info.si_signo == 0)) 446 return ret; 447 448 if (uru) { 449 ret = put_compat_rusage(&ru, uru); 450 if (ret) 451 return ret; 452 } 453 454 BUG_ON(info.si_code & __SI_MASK); 455 info.si_code |= __SI_CHLD; 456 return copy_siginfo_to_user32(uinfo, &info); 457 } 458 459 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 460 unsigned len, struct cpumask *new_mask) 461 { 462 unsigned long *k; 463 464 if (len < cpumask_size()) 465 memset(new_mask, 0, cpumask_size()); 466 else if (len > cpumask_size()) 467 len = cpumask_size(); 468 469 k = cpumask_bits(new_mask); 470 return compat_get_bitmap(k, user_mask_ptr, len * 8); 471 } 472 473 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 474 unsigned int len, 475 compat_ulong_t __user *user_mask_ptr) 476 { 477 cpumask_var_t new_mask; 478 int retval; 479 480 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 481 return -ENOMEM; 482 483 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 484 if (retval) 485 goto out; 486 487 retval = sched_setaffinity(pid, new_mask); 488 out: 489 free_cpumask_var(new_mask); 490 return retval; 491 } 492 493 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 494 compat_ulong_t __user *user_mask_ptr) 495 { 496 int ret; 497 cpumask_var_t mask; 498 unsigned long *k; 499 unsigned int min_length = cpumask_size(); 500 501 if (nr_cpu_ids <= BITS_PER_COMPAT_LONG) 502 min_length = sizeof(compat_ulong_t); 503 504 if (len < min_length) 505 return -EINVAL; 506 507 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 508 return -ENOMEM; 509 510 ret = sched_getaffinity(pid, mask); 511 if (ret < 0) 512 goto out; 513 514 k = cpumask_bits(mask); 515 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); 516 if (ret == 0) 517 ret = min_length; 518 519 out: 520 free_cpumask_var(mask); 521 return ret; 522 } 523 524 int get_compat_itimerspec(struct itimerspec *dst, 525 const struct compat_itimerspec __user *src) 526 { 527 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 528 get_compat_timespec(&dst->it_value, &src->it_value)) 529 return -EFAULT; 530 return 0; 531 } 532 533 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 534 const struct itimerspec *src) 535 { 536 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 537 put_compat_timespec(&src->it_value, &dst->it_value)) 538 return -EFAULT; 539 return 0; 540 } 541 542 long compat_sys_timer_create(clockid_t which_clock, 543 struct compat_sigevent __user *timer_event_spec, 544 timer_t __user *created_timer_id) 545 { 546 struct sigevent __user *event = NULL; 547 548 if (timer_event_spec) { 549 struct sigevent kevent; 550 551 event = compat_alloc_user_space(sizeof(*event)); 552 if (get_compat_sigevent(&kevent, timer_event_spec) || 553 copy_to_user(event, &kevent, sizeof(*event))) 554 return -EFAULT; 555 } 556 557 return sys_timer_create(which_clock, event, created_timer_id); 558 } 559 560 long compat_sys_timer_settime(timer_t timer_id, int flags, 561 struct compat_itimerspec __user *new, 562 struct compat_itimerspec __user *old) 563 { 564 long err; 565 mm_segment_t oldfs; 566 struct itimerspec newts, oldts; 567 568 if (!new) 569 return -EINVAL; 570 if (get_compat_itimerspec(&newts, new)) 571 return -EFAULT; 572 oldfs = get_fs(); 573 set_fs(KERNEL_DS); 574 err = sys_timer_settime(timer_id, flags, 575 (struct itimerspec __user *) &newts, 576 (struct itimerspec __user *) &oldts); 577 set_fs(oldfs); 578 if (!err && old && put_compat_itimerspec(old, &oldts)) 579 return -EFAULT; 580 return err; 581 } 582 583 long compat_sys_timer_gettime(timer_t timer_id, 584 struct compat_itimerspec __user *setting) 585 { 586 long err; 587 mm_segment_t oldfs; 588 struct itimerspec ts; 589 590 oldfs = get_fs(); 591 set_fs(KERNEL_DS); 592 err = sys_timer_gettime(timer_id, 593 (struct itimerspec __user *) &ts); 594 set_fs(oldfs); 595 if (!err && put_compat_itimerspec(setting, &ts)) 596 return -EFAULT; 597 return err; 598 } 599 600 long compat_sys_clock_settime(clockid_t which_clock, 601 struct compat_timespec __user *tp) 602 { 603 long err; 604 mm_segment_t oldfs; 605 struct timespec ts; 606 607 if (get_compat_timespec(&ts, tp)) 608 return -EFAULT; 609 oldfs = get_fs(); 610 set_fs(KERNEL_DS); 611 err = sys_clock_settime(which_clock, 612 (struct timespec __user *) &ts); 613 set_fs(oldfs); 614 return err; 615 } 616 617 long compat_sys_clock_gettime(clockid_t which_clock, 618 struct compat_timespec __user *tp) 619 { 620 long err; 621 mm_segment_t oldfs; 622 struct timespec ts; 623 624 oldfs = get_fs(); 625 set_fs(KERNEL_DS); 626 err = sys_clock_gettime(which_clock, 627 (struct timespec __user *) &ts); 628 set_fs(oldfs); 629 if (!err && put_compat_timespec(&ts, tp)) 630 return -EFAULT; 631 return err; 632 } 633 634 long compat_sys_clock_getres(clockid_t which_clock, 635 struct compat_timespec __user *tp) 636 { 637 long err; 638 mm_segment_t oldfs; 639 struct timespec ts; 640 641 oldfs = get_fs(); 642 set_fs(KERNEL_DS); 643 err = sys_clock_getres(which_clock, 644 (struct timespec __user *) &ts); 645 set_fs(oldfs); 646 if (!err && tp && put_compat_timespec(&ts, tp)) 647 return -EFAULT; 648 return err; 649 } 650 651 static long compat_clock_nanosleep_restart(struct restart_block *restart) 652 { 653 long err; 654 mm_segment_t oldfs; 655 struct timespec tu; 656 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp; 657 658 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 659 oldfs = get_fs(); 660 set_fs(KERNEL_DS); 661 err = clock_nanosleep_restart(restart); 662 set_fs(oldfs); 663 664 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 665 put_compat_timespec(&tu, rmtp)) 666 return -EFAULT; 667 668 if (err == -ERESTART_RESTARTBLOCK) { 669 restart->fn = compat_clock_nanosleep_restart; 670 restart->nanosleep.compat_rmtp = rmtp; 671 } 672 return err; 673 } 674 675 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 676 struct compat_timespec __user *rqtp, 677 struct compat_timespec __user *rmtp) 678 { 679 long err; 680 mm_segment_t oldfs; 681 struct timespec in, out; 682 struct restart_block *restart; 683 684 if (get_compat_timespec(&in, rqtp)) 685 return -EFAULT; 686 687 oldfs = get_fs(); 688 set_fs(KERNEL_DS); 689 err = sys_clock_nanosleep(which_clock, flags, 690 (struct timespec __user *) &in, 691 (struct timespec __user *) &out); 692 set_fs(oldfs); 693 694 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 695 put_compat_timespec(&out, rmtp)) 696 return -EFAULT; 697 698 if (err == -ERESTART_RESTARTBLOCK) { 699 restart = ¤t_thread_info()->restart_block; 700 restart->fn = compat_clock_nanosleep_restart; 701 restart->nanosleep.compat_rmtp = rmtp; 702 } 703 return err; 704 } 705 706 /* 707 * We currently only need the following fields from the sigevent 708 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 709 * sigev_notify_thread_id). The others are handled in user mode. 710 * We also assume that copying sigev_value.sival_int is sufficient 711 * to keep all the bits of sigev_value.sival_ptr intact. 712 */ 713 int get_compat_sigevent(struct sigevent *event, 714 const struct compat_sigevent __user *u_event) 715 { 716 memset(event, 0, sizeof(*event)); 717 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 718 __get_user(event->sigev_value.sival_int, 719 &u_event->sigev_value.sival_int) || 720 __get_user(event->sigev_signo, &u_event->sigev_signo) || 721 __get_user(event->sigev_notify, &u_event->sigev_notify) || 722 __get_user(event->sigev_notify_thread_id, 723 &u_event->sigev_notify_thread_id)) 724 ? -EFAULT : 0; 725 } 726 727 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 728 unsigned long bitmap_size) 729 { 730 int i, j; 731 unsigned long m; 732 compat_ulong_t um; 733 unsigned long nr_compat_longs; 734 735 /* align bitmap up to nearest compat_long_t boundary */ 736 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 737 738 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 739 return -EFAULT; 740 741 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 742 743 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 744 m = 0; 745 746 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 747 /* 748 * We dont want to read past the end of the userspace 749 * bitmap. We must however ensure the end of the 750 * kernel bitmap is zeroed. 751 */ 752 if (nr_compat_longs-- > 0) { 753 if (__get_user(um, umask)) 754 return -EFAULT; 755 } else { 756 um = 0; 757 } 758 759 umask++; 760 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 761 } 762 *mask++ = m; 763 } 764 765 return 0; 766 } 767 768 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 769 unsigned long bitmap_size) 770 { 771 int i, j; 772 unsigned long m; 773 compat_ulong_t um; 774 unsigned long nr_compat_longs; 775 776 /* align bitmap up to nearest compat_long_t boundary */ 777 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 778 779 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 780 return -EFAULT; 781 782 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 783 784 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 785 m = *mask++; 786 787 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 788 um = m; 789 790 /* 791 * We dont want to write past the end of the userspace 792 * bitmap. 793 */ 794 if (nr_compat_longs-- > 0) { 795 if (__put_user(um, umask)) 796 return -EFAULT; 797 } 798 799 umask++; 800 m >>= 4*sizeof(um); 801 m >>= 4*sizeof(um); 802 } 803 } 804 805 return 0; 806 } 807 808 void 809 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 810 { 811 switch (_NSIG_WORDS) { 812 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 813 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 814 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 815 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 816 } 817 } 818 819 asmlinkage long 820 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 821 struct compat_siginfo __user *uinfo, 822 struct compat_timespec __user *uts, compat_size_t sigsetsize) 823 { 824 compat_sigset_t s32; 825 sigset_t s; 826 int sig; 827 struct timespec t; 828 siginfo_t info; 829 long ret, timeout = 0; 830 831 if (sigsetsize != sizeof(sigset_t)) 832 return -EINVAL; 833 834 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 835 return -EFAULT; 836 sigset_from_compat(&s, &s32); 837 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); 838 signotset(&s); 839 840 if (uts) { 841 if (get_compat_timespec (&t, uts)) 842 return -EFAULT; 843 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 844 || t.tv_sec < 0) 845 return -EINVAL; 846 } 847 848 spin_lock_irq(¤t->sighand->siglock); 849 sig = dequeue_signal(current, &s, &info); 850 if (!sig) { 851 timeout = MAX_SCHEDULE_TIMEOUT; 852 if (uts) 853 timeout = timespec_to_jiffies(&t) 854 +(t.tv_sec || t.tv_nsec); 855 if (timeout) { 856 current->real_blocked = current->blocked; 857 sigandsets(¤t->blocked, ¤t->blocked, &s); 858 859 recalc_sigpending(); 860 spin_unlock_irq(¤t->sighand->siglock); 861 862 timeout = schedule_timeout_interruptible(timeout); 863 864 spin_lock_irq(¤t->sighand->siglock); 865 sig = dequeue_signal(current, &s, &info); 866 current->blocked = current->real_blocked; 867 siginitset(¤t->real_blocked, 0); 868 recalc_sigpending(); 869 } 870 } 871 spin_unlock_irq(¤t->sighand->siglock); 872 873 if (sig) { 874 ret = sig; 875 if (uinfo) { 876 if (copy_siginfo_to_user32(uinfo, &info)) 877 ret = -EFAULT; 878 } 879 }else { 880 ret = timeout?-EINTR:-EAGAIN; 881 } 882 return ret; 883 884 } 885 886 asmlinkage long 887 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig, 888 struct compat_siginfo __user *uinfo) 889 { 890 siginfo_t info; 891 892 if (copy_siginfo_from_user32(&info, uinfo)) 893 return -EFAULT; 894 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info); 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 return -EFAULT; 912 } 913 force_successful_syscall_return(); 914 return i; 915 } 916 917 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 918 { 919 struct timespec tv; 920 int err; 921 922 if (get_user(tv.tv_sec, tptr)) 923 return -EFAULT; 924 925 tv.tv_nsec = 0; 926 927 err = security_settime(&tv, NULL); 928 if (err) 929 return err; 930 931 do_settimeofday(&tv); 932 return 0; 933 } 934 935 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 936 937 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND 938 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) 939 { 940 sigset_t newset; 941 compat_sigset_t newset32; 942 943 /* XXX: Don't preclude handling different sized sigset_t's. */ 944 if (sigsetsize != sizeof(sigset_t)) 945 return -EINVAL; 946 947 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) 948 return -EFAULT; 949 sigset_from_compat(&newset, &newset32); 950 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 951 952 spin_lock_irq(¤t->sighand->siglock); 953 current->saved_sigmask = current->blocked; 954 current->blocked = newset; 955 recalc_sigpending(); 956 spin_unlock_irq(¤t->sighand->siglock); 957 958 current->state = TASK_INTERRUPTIBLE; 959 schedule(); 960 set_restore_sigmask(); 961 return -ERESTARTNOHAND; 962 } 963 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ 964 965 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) 966 { 967 struct timex txc; 968 int ret; 969 970 memset(&txc, 0, sizeof(struct timex)); 971 972 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || 973 __get_user(txc.modes, &utp->modes) || 974 __get_user(txc.offset, &utp->offset) || 975 __get_user(txc.freq, &utp->freq) || 976 __get_user(txc.maxerror, &utp->maxerror) || 977 __get_user(txc.esterror, &utp->esterror) || 978 __get_user(txc.status, &utp->status) || 979 __get_user(txc.constant, &utp->constant) || 980 __get_user(txc.precision, &utp->precision) || 981 __get_user(txc.tolerance, &utp->tolerance) || 982 __get_user(txc.time.tv_sec, &utp->time.tv_sec) || 983 __get_user(txc.time.tv_usec, &utp->time.tv_usec) || 984 __get_user(txc.tick, &utp->tick) || 985 __get_user(txc.ppsfreq, &utp->ppsfreq) || 986 __get_user(txc.jitter, &utp->jitter) || 987 __get_user(txc.shift, &utp->shift) || 988 __get_user(txc.stabil, &utp->stabil) || 989 __get_user(txc.jitcnt, &utp->jitcnt) || 990 __get_user(txc.calcnt, &utp->calcnt) || 991 __get_user(txc.errcnt, &utp->errcnt) || 992 __get_user(txc.stbcnt, &utp->stbcnt)) 993 return -EFAULT; 994 995 ret = do_adjtimex(&txc); 996 997 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || 998 __put_user(txc.modes, &utp->modes) || 999 __put_user(txc.offset, &utp->offset) || 1000 __put_user(txc.freq, &utp->freq) || 1001 __put_user(txc.maxerror, &utp->maxerror) || 1002 __put_user(txc.esterror, &utp->esterror) || 1003 __put_user(txc.status, &utp->status) || 1004 __put_user(txc.constant, &utp->constant) || 1005 __put_user(txc.precision, &utp->precision) || 1006 __put_user(txc.tolerance, &utp->tolerance) || 1007 __put_user(txc.time.tv_sec, &utp->time.tv_sec) || 1008 __put_user(txc.time.tv_usec, &utp->time.tv_usec) || 1009 __put_user(txc.tick, &utp->tick) || 1010 __put_user(txc.ppsfreq, &utp->ppsfreq) || 1011 __put_user(txc.jitter, &utp->jitter) || 1012 __put_user(txc.shift, &utp->shift) || 1013 __put_user(txc.stabil, &utp->stabil) || 1014 __put_user(txc.jitcnt, &utp->jitcnt) || 1015 __put_user(txc.calcnt, &utp->calcnt) || 1016 __put_user(txc.errcnt, &utp->errcnt) || 1017 __put_user(txc.stbcnt, &utp->stbcnt) || 1018 __put_user(txc.tai, &utp->tai)) 1019 ret = -EFAULT; 1020 1021 return ret; 1022 } 1023 1024 #ifdef CONFIG_NUMA 1025 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages, 1026 compat_uptr_t __user *pages32, 1027 const int __user *nodes, 1028 int __user *status, 1029 int flags) 1030 { 1031 const void __user * __user *pages; 1032 int i; 1033 1034 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1035 for (i = 0; i < nr_pages; i++) { 1036 compat_uptr_t p; 1037 1038 if (get_user(p, pages32 + i) || 1039 put_user(compat_ptr(p), pages + i)) 1040 return -EFAULT; 1041 } 1042 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1043 } 1044 1045 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, 1046 compat_ulong_t maxnode, 1047 const compat_ulong_t __user *old_nodes, 1048 const compat_ulong_t __user *new_nodes) 1049 { 1050 unsigned long __user *old = NULL; 1051 unsigned long __user *new = NULL; 1052 nodemask_t tmp_mask; 1053 unsigned long nr_bits; 1054 unsigned long size; 1055 1056 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1057 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1058 if (old_nodes) { 1059 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1060 return -EFAULT; 1061 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1062 if (new_nodes) 1063 new = old + size / sizeof(unsigned long); 1064 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1065 return -EFAULT; 1066 } 1067 if (new_nodes) { 1068 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1069 return -EFAULT; 1070 if (new == NULL) 1071 new = compat_alloc_user_space(size); 1072 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1073 return -EFAULT; 1074 } 1075 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1076 } 1077 #endif 1078 1079 struct compat_sysinfo { 1080 s32 uptime; 1081 u32 loads[3]; 1082 u32 totalram; 1083 u32 freeram; 1084 u32 sharedram; 1085 u32 bufferram; 1086 u32 totalswap; 1087 u32 freeswap; 1088 u16 procs; 1089 u16 pad; 1090 u32 totalhigh; 1091 u32 freehigh; 1092 u32 mem_unit; 1093 char _f[20-2*sizeof(u32)-sizeof(int)]; 1094 }; 1095 1096 asmlinkage long 1097 compat_sys_sysinfo(struct compat_sysinfo __user *info) 1098 { 1099 struct sysinfo s; 1100 1101 do_sysinfo(&s); 1102 1103 /* Check to see if any memory value is too large for 32-bit and scale 1104 * down if needed 1105 */ 1106 if ((s.totalram >> 32) || (s.totalswap >> 32)) { 1107 int bitcount = 0; 1108 1109 while (s.mem_unit < PAGE_SIZE) { 1110 s.mem_unit <<= 1; 1111 bitcount++; 1112 } 1113 1114 s.totalram >>= bitcount; 1115 s.freeram >>= bitcount; 1116 s.sharedram >>= bitcount; 1117 s.bufferram >>= bitcount; 1118 s.totalswap >>= bitcount; 1119 s.freeswap >>= bitcount; 1120 s.totalhigh >>= bitcount; 1121 s.freehigh >>= bitcount; 1122 } 1123 1124 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || 1125 __put_user (s.uptime, &info->uptime) || 1126 __put_user (s.loads[0], &info->loads[0]) || 1127 __put_user (s.loads[1], &info->loads[1]) || 1128 __put_user (s.loads[2], &info->loads[2]) || 1129 __put_user (s.totalram, &info->totalram) || 1130 __put_user (s.freeram, &info->freeram) || 1131 __put_user (s.sharedram, &info->sharedram) || 1132 __put_user (s.bufferram, &info->bufferram) || 1133 __put_user (s.totalswap, &info->totalswap) || 1134 __put_user (s.freeswap, &info->freeswap) || 1135 __put_user (s.procs, &info->procs) || 1136 __put_user (s.totalhigh, &info->totalhigh) || 1137 __put_user (s.freehigh, &info->freehigh) || 1138 __put_user (s.mem_unit, &info->mem_unit)) 1139 return -EFAULT; 1140 1141 return 0; 1142 } 1143