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 29 #include <asm/uaccess.h> 30 31 /* 32 * Note that the native side is already converted to a timespec, because 33 * that's what we want anyway. 34 */ 35 static int compat_get_timeval(struct timespec *o, 36 struct compat_timeval __user *i) 37 { 38 long usec; 39 40 if (get_user(o->tv_sec, &i->tv_sec) || 41 get_user(usec, &i->tv_usec)) 42 return -EFAULT; 43 o->tv_nsec = usec * 1000; 44 return 0; 45 } 46 47 static int compat_put_timeval(struct compat_timeval __user *o, 48 struct timeval *i) 49 { 50 return (put_user(i->tv_sec, &o->tv_sec) || 51 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0; 52 } 53 54 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv, 55 struct timezone __user *tz) 56 { 57 if (tv) { 58 struct timeval ktv; 59 do_gettimeofday(&ktv); 60 if (compat_put_timeval(tv, &ktv)) 61 return -EFAULT; 62 } 63 if (tz) { 64 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) 65 return -EFAULT; 66 } 67 68 return 0; 69 } 70 71 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv, 72 struct timezone __user *tz) 73 { 74 struct timespec kts; 75 struct timezone ktz; 76 77 if (tv) { 78 if (compat_get_timeval(&kts, tv)) 79 return -EFAULT; 80 } 81 if (tz) { 82 if (copy_from_user(&ktz, tz, sizeof(ktz))) 83 return -EFAULT; 84 } 85 86 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL); 87 } 88 89 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts) 90 { 91 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || 92 __get_user(ts->tv_sec, &cts->tv_sec) || 93 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 94 } 95 96 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts) 97 { 98 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || 99 __put_user(ts->tv_sec, &cts->tv_sec) || 100 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 101 } 102 103 static long compat_nanosleep_restart(struct restart_block *restart) 104 { 105 struct compat_timespec __user *rmtp; 106 struct timespec rmt; 107 mm_segment_t oldfs; 108 long ret; 109 110 restart->nanosleep.rmtp = (struct timespec __user *) &rmt; 111 oldfs = get_fs(); 112 set_fs(KERNEL_DS); 113 ret = hrtimer_nanosleep_restart(restart); 114 set_fs(oldfs); 115 116 if (ret) { 117 rmtp = restart->nanosleep.compat_rmtp; 118 119 if (rmtp && put_compat_timespec(&rmt, rmtp)) 120 return -EFAULT; 121 } 122 123 return ret; 124 } 125 126 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, 127 struct compat_timespec __user *rmtp) 128 { 129 struct timespec tu, rmt; 130 mm_segment_t oldfs; 131 long ret; 132 133 if (get_compat_timespec(&tu, rqtp)) 134 return -EFAULT; 135 136 if (!timespec_valid(&tu)) 137 return -EINVAL; 138 139 oldfs = get_fs(); 140 set_fs(KERNEL_DS); 141 ret = hrtimer_nanosleep(&tu, 142 rmtp ? (struct timespec __user *)&rmt : NULL, 143 HRTIMER_MODE_REL, CLOCK_MONOTONIC); 144 set_fs(oldfs); 145 146 if (ret) { 147 struct restart_block *restart 148 = ¤t_thread_info()->restart_block; 149 150 restart->fn = compat_nanosleep_restart; 151 restart->nanosleep.compat_rmtp = rmtp; 152 153 if (rmtp && put_compat_timespec(&rmt, rmtp)) 154 return -EFAULT; 155 } 156 157 return ret; 158 } 159 160 static inline long get_compat_itimerval(struct itimerval *o, 161 struct compat_itimerval __user *i) 162 { 163 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 164 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 165 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 166 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 167 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 168 } 169 170 static inline long put_compat_itimerval(struct compat_itimerval __user *o, 171 struct itimerval *i) 172 { 173 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 174 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 175 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 176 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 177 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 178 } 179 180 asmlinkage long compat_sys_getitimer(int which, 181 struct compat_itimerval __user *it) 182 { 183 struct itimerval kit; 184 int error; 185 186 error = do_getitimer(which, &kit); 187 if (!error && put_compat_itimerval(it, &kit)) 188 error = -EFAULT; 189 return error; 190 } 191 192 asmlinkage long compat_sys_setitimer(int which, 193 struct compat_itimerval __user *in, 194 struct compat_itimerval __user *out) 195 { 196 struct itimerval kin, kout; 197 int error; 198 199 if (in) { 200 if (get_compat_itimerval(&kin, in)) 201 return -EFAULT; 202 } else 203 memset(&kin, 0, sizeof(kin)); 204 205 error = do_setitimer(which, &kin, out ? &kout : NULL); 206 if (error || !out) 207 return error; 208 if (put_compat_itimerval(out, &kout)) 209 return -EFAULT; 210 return 0; 211 } 212 213 static compat_clock_t clock_t_to_compat_clock_t(clock_t x) 214 { 215 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); 216 } 217 218 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) 219 { 220 if (tbuf) { 221 struct tms tms; 222 struct compat_tms tmp; 223 224 do_sys_times(&tms); 225 /* Convert our struct tms to the compat version. */ 226 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); 227 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); 228 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); 229 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); 230 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 231 return -EFAULT; 232 } 233 force_successful_syscall_return(); 234 return compat_jiffies_to_clock_t(jiffies); 235 } 236 237 /* 238 * Assumption: old_sigset_t and compat_old_sigset_t are both 239 * types that can be passed to put_user()/get_user(). 240 */ 241 242 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) 243 { 244 old_sigset_t s; 245 long ret; 246 mm_segment_t old_fs = get_fs(); 247 248 set_fs(KERNEL_DS); 249 ret = sys_sigpending((old_sigset_t __user *) &s); 250 set_fs(old_fs); 251 if (ret == 0) 252 ret = put_user(s, set); 253 return ret; 254 } 255 256 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set, 257 compat_old_sigset_t __user *oset) 258 { 259 old_sigset_t s; 260 long ret; 261 mm_segment_t old_fs; 262 263 if (set && get_user(s, set)) 264 return -EFAULT; 265 old_fs = get_fs(); 266 set_fs(KERNEL_DS); 267 ret = sys_sigprocmask(how, 268 set ? (old_sigset_t __user *) &s : NULL, 269 oset ? (old_sigset_t __user *) &s : NULL); 270 set_fs(old_fs); 271 if (ret == 0) 272 if (oset) 273 ret = put_user(s, oset); 274 return ret; 275 } 276 277 asmlinkage long compat_sys_setrlimit(unsigned int resource, 278 struct compat_rlimit __user *rlim) 279 { 280 struct rlimit r; 281 int ret; 282 mm_segment_t old_fs = get_fs (); 283 284 if (resource >= RLIM_NLIMITS) 285 return -EINVAL; 286 287 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 288 __get_user(r.rlim_cur, &rlim->rlim_cur) || 289 __get_user(r.rlim_max, &rlim->rlim_max)) 290 return -EFAULT; 291 292 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 293 r.rlim_cur = RLIM_INFINITY; 294 if (r.rlim_max == COMPAT_RLIM_INFINITY) 295 r.rlim_max = RLIM_INFINITY; 296 set_fs(KERNEL_DS); 297 ret = sys_setrlimit(resource, (struct rlimit __user *) &r); 298 set_fs(old_fs); 299 return ret; 300 } 301 302 #ifdef COMPAT_RLIM_OLD_INFINITY 303 304 asmlinkage long compat_sys_old_getrlimit(unsigned int resource, 305 struct compat_rlimit __user *rlim) 306 { 307 struct rlimit r; 308 int ret; 309 mm_segment_t old_fs = get_fs(); 310 311 set_fs(KERNEL_DS); 312 ret = sys_old_getrlimit(resource, &r); 313 set_fs(old_fs); 314 315 if (!ret) { 316 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 317 r.rlim_cur = COMPAT_RLIM_INFINITY; 318 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 319 r.rlim_max = COMPAT_RLIM_INFINITY; 320 321 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 322 __put_user(r.rlim_cur, &rlim->rlim_cur) || 323 __put_user(r.rlim_max, &rlim->rlim_max)) 324 return -EFAULT; 325 } 326 return ret; 327 } 328 329 #endif 330 331 asmlinkage long compat_sys_getrlimit (unsigned int resource, 332 struct compat_rlimit __user *rlim) 333 { 334 struct rlimit r; 335 int ret; 336 mm_segment_t old_fs = get_fs(); 337 338 set_fs(KERNEL_DS); 339 ret = sys_getrlimit(resource, (struct rlimit __user *) &r); 340 set_fs(old_fs); 341 if (!ret) { 342 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 343 r.rlim_cur = COMPAT_RLIM_INFINITY; 344 if (r.rlim_max > COMPAT_RLIM_INFINITY) 345 r.rlim_max = COMPAT_RLIM_INFINITY; 346 347 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 348 __put_user(r.rlim_cur, &rlim->rlim_cur) || 349 __put_user(r.rlim_max, &rlim->rlim_max)) 350 return -EFAULT; 351 } 352 return ret; 353 } 354 355 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 356 { 357 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 358 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 359 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 360 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 361 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 362 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 363 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 364 __put_user(r->ru_idrss, &ru->ru_idrss) || 365 __put_user(r->ru_isrss, &ru->ru_isrss) || 366 __put_user(r->ru_minflt, &ru->ru_minflt) || 367 __put_user(r->ru_majflt, &ru->ru_majflt) || 368 __put_user(r->ru_nswap, &ru->ru_nswap) || 369 __put_user(r->ru_inblock, &ru->ru_inblock) || 370 __put_user(r->ru_oublock, &ru->ru_oublock) || 371 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 372 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 373 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 374 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 375 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 376 return -EFAULT; 377 return 0; 378 } 379 380 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) 381 { 382 struct rusage r; 383 int ret; 384 mm_segment_t old_fs = get_fs(); 385 386 set_fs(KERNEL_DS); 387 ret = sys_getrusage(who, (struct rusage __user *) &r); 388 set_fs(old_fs); 389 390 if (ret) 391 return ret; 392 393 if (put_compat_rusage(&r, ru)) 394 return -EFAULT; 395 396 return 0; 397 } 398 399 asmlinkage long 400 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, 401 struct compat_rusage __user *ru) 402 { 403 if (!ru) { 404 return sys_wait4(pid, stat_addr, options, NULL); 405 } else { 406 struct rusage r; 407 int ret; 408 unsigned int status; 409 mm_segment_t old_fs = get_fs(); 410 411 set_fs (KERNEL_DS); 412 ret = sys_wait4(pid, 413 (stat_addr ? 414 (unsigned int __user *) &status : NULL), 415 options, (struct rusage __user *) &r); 416 set_fs (old_fs); 417 418 if (ret > 0) { 419 if (put_compat_rusage(&r, ru)) 420 return -EFAULT; 421 if (stat_addr && put_user(status, stat_addr)) 422 return -EFAULT; 423 } 424 return ret; 425 } 426 } 427 428 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, 429 struct compat_siginfo __user *uinfo, int options, 430 struct compat_rusage __user *uru) 431 { 432 siginfo_t info; 433 struct rusage ru; 434 long ret; 435 mm_segment_t old_fs = get_fs(); 436 437 memset(&info, 0, sizeof(info)); 438 439 set_fs(KERNEL_DS); 440 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 441 uru ? (struct rusage __user *)&ru : NULL); 442 set_fs(old_fs); 443 444 if ((ret < 0) || (info.si_signo == 0)) 445 return ret; 446 447 if (uru) { 448 ret = put_compat_rusage(&ru, uru); 449 if (ret) 450 return ret; 451 } 452 453 BUG_ON(info.si_code & __SI_MASK); 454 info.si_code |= __SI_CHLD; 455 return copy_siginfo_to_user32(uinfo, &info); 456 } 457 458 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 459 unsigned len, struct cpumask *new_mask) 460 { 461 unsigned long *k; 462 463 if (len < cpumask_size()) 464 memset(new_mask, 0, cpumask_size()); 465 else if (len > cpumask_size()) 466 len = cpumask_size(); 467 468 k = cpumask_bits(new_mask); 469 return compat_get_bitmap(k, user_mask_ptr, len * 8); 470 } 471 472 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 473 unsigned int len, 474 compat_ulong_t __user *user_mask_ptr) 475 { 476 cpumask_var_t new_mask; 477 int retval; 478 479 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 480 return -ENOMEM; 481 482 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 483 if (retval) 484 goto out; 485 486 retval = sched_setaffinity(pid, new_mask); 487 out: 488 free_cpumask_var(new_mask); 489 return retval; 490 } 491 492 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 493 compat_ulong_t __user *user_mask_ptr) 494 { 495 int ret; 496 cpumask_var_t mask; 497 unsigned long *k; 498 unsigned int min_length = cpumask_size(); 499 500 if (nr_cpu_ids <= BITS_PER_COMPAT_LONG) 501 min_length = sizeof(compat_ulong_t); 502 503 if (len < min_length) 504 return -EINVAL; 505 506 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 507 return -ENOMEM; 508 509 ret = sched_getaffinity(pid, mask); 510 if (ret < 0) 511 goto out; 512 513 k = cpumask_bits(mask); 514 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); 515 if (ret == 0) 516 ret = min_length; 517 518 out: 519 free_cpumask_var(mask); 520 return ret; 521 } 522 523 int get_compat_itimerspec(struct itimerspec *dst, 524 const struct compat_itimerspec __user *src) 525 { 526 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 527 get_compat_timespec(&dst->it_value, &src->it_value)) 528 return -EFAULT; 529 return 0; 530 } 531 532 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 533 const struct itimerspec *src) 534 { 535 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 536 put_compat_timespec(&src->it_value, &dst->it_value)) 537 return -EFAULT; 538 return 0; 539 } 540 541 long compat_sys_timer_create(clockid_t which_clock, 542 struct compat_sigevent __user *timer_event_spec, 543 timer_t __user *created_timer_id) 544 { 545 struct sigevent __user *event = NULL; 546 547 if (timer_event_spec) { 548 struct sigevent kevent; 549 550 event = compat_alloc_user_space(sizeof(*event)); 551 if (get_compat_sigevent(&kevent, timer_event_spec) || 552 copy_to_user(event, &kevent, sizeof(*event))) 553 return -EFAULT; 554 } 555 556 return sys_timer_create(which_clock, event, created_timer_id); 557 } 558 559 long compat_sys_timer_settime(timer_t timer_id, int flags, 560 struct compat_itimerspec __user *new, 561 struct compat_itimerspec __user *old) 562 { 563 long err; 564 mm_segment_t oldfs; 565 struct itimerspec newts, oldts; 566 567 if (!new) 568 return -EINVAL; 569 if (get_compat_itimerspec(&newts, new)) 570 return -EFAULT; 571 oldfs = get_fs(); 572 set_fs(KERNEL_DS); 573 err = sys_timer_settime(timer_id, flags, 574 (struct itimerspec __user *) &newts, 575 (struct itimerspec __user *) &oldts); 576 set_fs(oldfs); 577 if (!err && old && put_compat_itimerspec(old, &oldts)) 578 return -EFAULT; 579 return err; 580 } 581 582 long compat_sys_timer_gettime(timer_t timer_id, 583 struct compat_itimerspec __user *setting) 584 { 585 long err; 586 mm_segment_t oldfs; 587 struct itimerspec ts; 588 589 oldfs = get_fs(); 590 set_fs(KERNEL_DS); 591 err = sys_timer_gettime(timer_id, 592 (struct itimerspec __user *) &ts); 593 set_fs(oldfs); 594 if (!err && put_compat_itimerspec(setting, &ts)) 595 return -EFAULT; 596 return err; 597 } 598 599 long compat_sys_clock_settime(clockid_t which_clock, 600 struct compat_timespec __user *tp) 601 { 602 long err; 603 mm_segment_t oldfs; 604 struct timespec ts; 605 606 if (get_compat_timespec(&ts, tp)) 607 return -EFAULT; 608 oldfs = get_fs(); 609 set_fs(KERNEL_DS); 610 err = sys_clock_settime(which_clock, 611 (struct timespec __user *) &ts); 612 set_fs(oldfs); 613 return err; 614 } 615 616 long compat_sys_clock_gettime(clockid_t which_clock, 617 struct compat_timespec __user *tp) 618 { 619 long err; 620 mm_segment_t oldfs; 621 struct timespec ts; 622 623 oldfs = get_fs(); 624 set_fs(KERNEL_DS); 625 err = sys_clock_gettime(which_clock, 626 (struct timespec __user *) &ts); 627 set_fs(oldfs); 628 if (!err && put_compat_timespec(&ts, tp)) 629 return -EFAULT; 630 return err; 631 } 632 633 long compat_sys_clock_getres(clockid_t which_clock, 634 struct compat_timespec __user *tp) 635 { 636 long err; 637 mm_segment_t oldfs; 638 struct timespec ts; 639 640 oldfs = get_fs(); 641 set_fs(KERNEL_DS); 642 err = sys_clock_getres(which_clock, 643 (struct timespec __user *) &ts); 644 set_fs(oldfs); 645 if (!err && tp && put_compat_timespec(&ts, tp)) 646 return -EFAULT; 647 return err; 648 } 649 650 static long compat_clock_nanosleep_restart(struct restart_block *restart) 651 { 652 long err; 653 mm_segment_t oldfs; 654 struct timespec tu; 655 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp; 656 657 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 658 oldfs = get_fs(); 659 set_fs(KERNEL_DS); 660 err = clock_nanosleep_restart(restart); 661 set_fs(oldfs); 662 663 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 664 put_compat_timespec(&tu, rmtp)) 665 return -EFAULT; 666 667 if (err == -ERESTART_RESTARTBLOCK) { 668 restart->fn = compat_clock_nanosleep_restart; 669 restart->nanosleep.compat_rmtp = rmtp; 670 } 671 return err; 672 } 673 674 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 675 struct compat_timespec __user *rqtp, 676 struct compat_timespec __user *rmtp) 677 { 678 long err; 679 mm_segment_t oldfs; 680 struct timespec in, out; 681 struct restart_block *restart; 682 683 if (get_compat_timespec(&in, rqtp)) 684 return -EFAULT; 685 686 oldfs = get_fs(); 687 set_fs(KERNEL_DS); 688 err = sys_clock_nanosleep(which_clock, flags, 689 (struct timespec __user *) &in, 690 (struct timespec __user *) &out); 691 set_fs(oldfs); 692 693 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 694 put_compat_timespec(&out, rmtp)) 695 return -EFAULT; 696 697 if (err == -ERESTART_RESTARTBLOCK) { 698 restart = ¤t_thread_info()->restart_block; 699 restart->fn = compat_clock_nanosleep_restart; 700 restart->nanosleep.compat_rmtp = rmtp; 701 } 702 return err; 703 } 704 705 /* 706 * We currently only need the following fields from the sigevent 707 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 708 * sigev_notify_thread_id). The others are handled in user mode. 709 * We also assume that copying sigev_value.sival_int is sufficient 710 * to keep all the bits of sigev_value.sival_ptr intact. 711 */ 712 int get_compat_sigevent(struct sigevent *event, 713 const struct compat_sigevent __user *u_event) 714 { 715 memset(event, 0, sizeof(*event)); 716 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 717 __get_user(event->sigev_value.sival_int, 718 &u_event->sigev_value.sival_int) || 719 __get_user(event->sigev_signo, &u_event->sigev_signo) || 720 __get_user(event->sigev_notify, &u_event->sigev_notify) || 721 __get_user(event->sigev_notify_thread_id, 722 &u_event->sigev_notify_thread_id)) 723 ? -EFAULT : 0; 724 } 725 726 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 727 unsigned long bitmap_size) 728 { 729 int i, j; 730 unsigned long m; 731 compat_ulong_t um; 732 unsigned long nr_compat_longs; 733 734 /* align bitmap up to nearest compat_long_t boundary */ 735 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 736 737 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 738 return -EFAULT; 739 740 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 741 742 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 743 m = 0; 744 745 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 746 /* 747 * We dont want to read past the end of the userspace 748 * bitmap. We must however ensure the end of the 749 * kernel bitmap is zeroed. 750 */ 751 if (nr_compat_longs-- > 0) { 752 if (__get_user(um, umask)) 753 return -EFAULT; 754 } else { 755 um = 0; 756 } 757 758 umask++; 759 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 760 } 761 *mask++ = m; 762 } 763 764 return 0; 765 } 766 767 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 768 unsigned long bitmap_size) 769 { 770 int i, j; 771 unsigned long m; 772 compat_ulong_t um; 773 unsigned long nr_compat_longs; 774 775 /* align bitmap up to nearest compat_long_t boundary */ 776 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 777 778 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 779 return -EFAULT; 780 781 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 782 783 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 784 m = *mask++; 785 786 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 787 um = m; 788 789 /* 790 * We dont want to write past the end of the userspace 791 * bitmap. 792 */ 793 if (nr_compat_longs-- > 0) { 794 if (__put_user(um, umask)) 795 return -EFAULT; 796 } 797 798 umask++; 799 m >>= 4*sizeof(um); 800 m >>= 4*sizeof(um); 801 } 802 } 803 804 return 0; 805 } 806 807 void 808 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 809 { 810 switch (_NSIG_WORDS) { 811 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 812 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 813 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 814 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 815 } 816 } 817 818 asmlinkage long 819 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 820 struct compat_siginfo __user *uinfo, 821 struct compat_timespec __user *uts, compat_size_t sigsetsize) 822 { 823 compat_sigset_t s32; 824 sigset_t s; 825 int sig; 826 struct timespec t; 827 siginfo_t info; 828 long ret, timeout = 0; 829 830 if (sigsetsize != sizeof(sigset_t)) 831 return -EINVAL; 832 833 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 834 return -EFAULT; 835 sigset_from_compat(&s, &s32); 836 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); 837 signotset(&s); 838 839 if (uts) { 840 if (get_compat_timespec (&t, uts)) 841 return -EFAULT; 842 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 843 || t.tv_sec < 0) 844 return -EINVAL; 845 } 846 847 spin_lock_irq(¤t->sighand->siglock); 848 sig = dequeue_signal(current, &s, &info); 849 if (!sig) { 850 timeout = MAX_SCHEDULE_TIMEOUT; 851 if (uts) 852 timeout = timespec_to_jiffies(&t) 853 +(t.tv_sec || t.tv_nsec); 854 if (timeout) { 855 current->real_blocked = current->blocked; 856 sigandsets(¤t->blocked, ¤t->blocked, &s); 857 858 recalc_sigpending(); 859 spin_unlock_irq(¤t->sighand->siglock); 860 861 timeout = schedule_timeout_interruptible(timeout); 862 863 spin_lock_irq(¤t->sighand->siglock); 864 sig = dequeue_signal(current, &s, &info); 865 current->blocked = current->real_blocked; 866 siginitset(¤t->real_blocked, 0); 867 recalc_sigpending(); 868 } 869 } 870 spin_unlock_irq(¤t->sighand->siglock); 871 872 if (sig) { 873 ret = sig; 874 if (uinfo) { 875 if (copy_siginfo_to_user32(uinfo, &info)) 876 ret = -EFAULT; 877 } 878 }else { 879 ret = timeout?-EINTR:-EAGAIN; 880 } 881 return ret; 882 883 } 884 885 asmlinkage long 886 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig, 887 struct compat_siginfo __user *uinfo) 888 { 889 siginfo_t info; 890 891 if (copy_siginfo_from_user32(&info, uinfo)) 892 return -EFAULT; 893 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info); 894 } 895 896 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 897 898 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 899 900 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 901 { 902 compat_time_t i; 903 struct timeval tv; 904 905 do_gettimeofday(&tv); 906 i = tv.tv_sec; 907 908 if (tloc) { 909 if (put_user(i,tloc)) 910 return -EFAULT; 911 } 912 force_successful_syscall_return(); 913 return i; 914 } 915 916 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 917 { 918 struct timespec tv; 919 int err; 920 921 if (get_user(tv.tv_sec, tptr)) 922 return -EFAULT; 923 924 tv.tv_nsec = 0; 925 926 err = security_settime(&tv, NULL); 927 if (err) 928 return err; 929 930 do_settimeofday(&tv); 931 return 0; 932 } 933 934 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 935 936 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND 937 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) 938 { 939 sigset_t newset; 940 compat_sigset_t newset32; 941 942 /* XXX: Don't preclude handling different sized sigset_t's. */ 943 if (sigsetsize != sizeof(sigset_t)) 944 return -EINVAL; 945 946 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) 947 return -EFAULT; 948 sigset_from_compat(&newset, &newset32); 949 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 950 951 spin_lock_irq(¤t->sighand->siglock); 952 current->saved_sigmask = current->blocked; 953 current->blocked = newset; 954 recalc_sigpending(); 955 spin_unlock_irq(¤t->sighand->siglock); 956 957 current->state = TASK_INTERRUPTIBLE; 958 schedule(); 959 set_restore_sigmask(); 960 return -ERESTARTNOHAND; 961 } 962 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ 963 964 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) 965 { 966 struct timex txc; 967 int ret; 968 969 memset(&txc, 0, sizeof(struct timex)); 970 971 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || 972 __get_user(txc.modes, &utp->modes) || 973 __get_user(txc.offset, &utp->offset) || 974 __get_user(txc.freq, &utp->freq) || 975 __get_user(txc.maxerror, &utp->maxerror) || 976 __get_user(txc.esterror, &utp->esterror) || 977 __get_user(txc.status, &utp->status) || 978 __get_user(txc.constant, &utp->constant) || 979 __get_user(txc.precision, &utp->precision) || 980 __get_user(txc.tolerance, &utp->tolerance) || 981 __get_user(txc.time.tv_sec, &utp->time.tv_sec) || 982 __get_user(txc.time.tv_usec, &utp->time.tv_usec) || 983 __get_user(txc.tick, &utp->tick) || 984 __get_user(txc.ppsfreq, &utp->ppsfreq) || 985 __get_user(txc.jitter, &utp->jitter) || 986 __get_user(txc.shift, &utp->shift) || 987 __get_user(txc.stabil, &utp->stabil) || 988 __get_user(txc.jitcnt, &utp->jitcnt) || 989 __get_user(txc.calcnt, &utp->calcnt) || 990 __get_user(txc.errcnt, &utp->errcnt) || 991 __get_user(txc.stbcnt, &utp->stbcnt)) 992 return -EFAULT; 993 994 ret = do_adjtimex(&txc); 995 996 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || 997 __put_user(txc.modes, &utp->modes) || 998 __put_user(txc.offset, &utp->offset) || 999 __put_user(txc.freq, &utp->freq) || 1000 __put_user(txc.maxerror, &utp->maxerror) || 1001 __put_user(txc.esterror, &utp->esterror) || 1002 __put_user(txc.status, &utp->status) || 1003 __put_user(txc.constant, &utp->constant) || 1004 __put_user(txc.precision, &utp->precision) || 1005 __put_user(txc.tolerance, &utp->tolerance) || 1006 __put_user(txc.time.tv_sec, &utp->time.tv_sec) || 1007 __put_user(txc.time.tv_usec, &utp->time.tv_usec) || 1008 __put_user(txc.tick, &utp->tick) || 1009 __put_user(txc.ppsfreq, &utp->ppsfreq) || 1010 __put_user(txc.jitter, &utp->jitter) || 1011 __put_user(txc.shift, &utp->shift) || 1012 __put_user(txc.stabil, &utp->stabil) || 1013 __put_user(txc.jitcnt, &utp->jitcnt) || 1014 __put_user(txc.calcnt, &utp->calcnt) || 1015 __put_user(txc.errcnt, &utp->errcnt) || 1016 __put_user(txc.stbcnt, &utp->stbcnt) || 1017 __put_user(txc.tai, &utp->tai)) 1018 ret = -EFAULT; 1019 1020 return ret; 1021 } 1022 1023 #ifdef CONFIG_NUMA 1024 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages, 1025 compat_uptr_t __user *pages32, 1026 const int __user *nodes, 1027 int __user *status, 1028 int flags) 1029 { 1030 const void __user * __user *pages; 1031 int i; 1032 1033 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1034 for (i = 0; i < nr_pages; i++) { 1035 compat_uptr_t p; 1036 1037 if (get_user(p, pages32 + i) || 1038 put_user(compat_ptr(p), pages + i)) 1039 return -EFAULT; 1040 } 1041 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1042 } 1043 1044 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, 1045 compat_ulong_t maxnode, 1046 const compat_ulong_t __user *old_nodes, 1047 const compat_ulong_t __user *new_nodes) 1048 { 1049 unsigned long __user *old = NULL; 1050 unsigned long __user *new = NULL; 1051 nodemask_t tmp_mask; 1052 unsigned long nr_bits; 1053 unsigned long size; 1054 1055 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1056 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1057 if (old_nodes) { 1058 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1059 return -EFAULT; 1060 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1061 if (new_nodes) 1062 new = old + size / sizeof(unsigned long); 1063 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1064 return -EFAULT; 1065 } 1066 if (new_nodes) { 1067 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1068 return -EFAULT; 1069 if (new == NULL) 1070 new = compat_alloc_user_space(size); 1071 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1072 return -EFAULT; 1073 } 1074 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1075 } 1076 #endif 1077 1078 struct compat_sysinfo { 1079 s32 uptime; 1080 u32 loads[3]; 1081 u32 totalram; 1082 u32 freeram; 1083 u32 sharedram; 1084 u32 bufferram; 1085 u32 totalswap; 1086 u32 freeswap; 1087 u16 procs; 1088 u16 pad; 1089 u32 totalhigh; 1090 u32 freehigh; 1091 u32 mem_unit; 1092 char _f[20-2*sizeof(u32)-sizeof(int)]; 1093 }; 1094 1095 asmlinkage long 1096 compat_sys_sysinfo(struct compat_sysinfo __user *info) 1097 { 1098 struct sysinfo s; 1099 1100 do_sysinfo(&s); 1101 1102 /* Check to see if any memory value is too large for 32-bit and scale 1103 * down if needed 1104 */ 1105 if ((s.totalram >> 32) || (s.totalswap >> 32)) { 1106 int bitcount = 0; 1107 1108 while (s.mem_unit < PAGE_SIZE) { 1109 s.mem_unit <<= 1; 1110 bitcount++; 1111 } 1112 1113 s.totalram >>= bitcount; 1114 s.freeram >>= bitcount; 1115 s.sharedram >>= bitcount; 1116 s.bufferram >>= bitcount; 1117 s.totalswap >>= bitcount; 1118 s.freeswap >>= bitcount; 1119 s.totalhigh >>= bitcount; 1120 s.freehigh >>= bitcount; 1121 } 1122 1123 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || 1124 __put_user (s.uptime, &info->uptime) || 1125 __put_user (s.loads[0], &info->loads[0]) || 1126 __put_user (s.loads[1], &info->loads[1]) || 1127 __put_user (s.loads[2], &info->loads[2]) || 1128 __put_user (s.totalram, &info->totalram) || 1129 __put_user (s.freeram, &info->freeram) || 1130 __put_user (s.sharedram, &info->sharedram) || 1131 __put_user (s.bufferram, &info->bufferram) || 1132 __put_user (s.totalswap, &info->totalswap) || 1133 __put_user (s.freeswap, &info->freeswap) || 1134 __put_user (s.procs, &info->procs) || 1135 __put_user (s.totalhigh, &info->totalhigh) || 1136 __put_user (s.freehigh, &info->freehigh) || 1137 __put_user (s.mem_unit, &info->mem_unit)) 1138 return -EFAULT; 1139 1140 return 0; 1141 } 1142