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; 282 283 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 284 __get_user(r.rlim_cur, &rlim->rlim_cur) || 285 __get_user(r.rlim_max, &rlim->rlim_max)) 286 return -EFAULT; 287 288 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 289 r.rlim_cur = RLIM_INFINITY; 290 if (r.rlim_max == COMPAT_RLIM_INFINITY) 291 r.rlim_max = RLIM_INFINITY; 292 return do_prlimit(current, resource, &r, NULL); 293 } 294 295 #ifdef COMPAT_RLIM_OLD_INFINITY 296 297 asmlinkage long compat_sys_old_getrlimit(unsigned int resource, 298 struct compat_rlimit __user *rlim) 299 { 300 struct rlimit r; 301 int ret; 302 mm_segment_t old_fs = get_fs(); 303 304 set_fs(KERNEL_DS); 305 ret = sys_old_getrlimit(resource, &r); 306 set_fs(old_fs); 307 308 if (!ret) { 309 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 310 r.rlim_cur = COMPAT_RLIM_INFINITY; 311 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 312 r.rlim_max = COMPAT_RLIM_INFINITY; 313 314 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 315 __put_user(r.rlim_cur, &rlim->rlim_cur) || 316 __put_user(r.rlim_max, &rlim->rlim_max)) 317 return -EFAULT; 318 } 319 return ret; 320 } 321 322 #endif 323 324 asmlinkage long compat_sys_getrlimit(unsigned int resource, 325 struct compat_rlimit __user *rlim) 326 { 327 struct rlimit r; 328 int ret; 329 330 ret = do_prlimit(current, resource, NULL, &r); 331 if (!ret) { 332 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 333 r.rlim_cur = COMPAT_RLIM_INFINITY; 334 if (r.rlim_max > COMPAT_RLIM_INFINITY) 335 r.rlim_max = COMPAT_RLIM_INFINITY; 336 337 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 338 __put_user(r.rlim_cur, &rlim->rlim_cur) || 339 __put_user(r.rlim_max, &rlim->rlim_max)) 340 return -EFAULT; 341 } 342 return ret; 343 } 344 345 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 346 { 347 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 348 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 349 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 350 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 351 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 352 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 353 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 354 __put_user(r->ru_idrss, &ru->ru_idrss) || 355 __put_user(r->ru_isrss, &ru->ru_isrss) || 356 __put_user(r->ru_minflt, &ru->ru_minflt) || 357 __put_user(r->ru_majflt, &ru->ru_majflt) || 358 __put_user(r->ru_nswap, &ru->ru_nswap) || 359 __put_user(r->ru_inblock, &ru->ru_inblock) || 360 __put_user(r->ru_oublock, &ru->ru_oublock) || 361 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 362 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 363 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 364 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 365 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 366 return -EFAULT; 367 return 0; 368 } 369 370 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) 371 { 372 struct rusage r; 373 int ret; 374 mm_segment_t old_fs = get_fs(); 375 376 set_fs(KERNEL_DS); 377 ret = sys_getrusage(who, (struct rusage __user *) &r); 378 set_fs(old_fs); 379 380 if (ret) 381 return ret; 382 383 if (put_compat_rusage(&r, ru)) 384 return -EFAULT; 385 386 return 0; 387 } 388 389 asmlinkage long 390 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, 391 struct compat_rusage __user *ru) 392 { 393 if (!ru) { 394 return sys_wait4(pid, stat_addr, options, NULL); 395 } else { 396 struct rusage r; 397 int ret; 398 unsigned int status; 399 mm_segment_t old_fs = get_fs(); 400 401 set_fs (KERNEL_DS); 402 ret = sys_wait4(pid, 403 (stat_addr ? 404 (unsigned int __user *) &status : NULL), 405 options, (struct rusage __user *) &r); 406 set_fs (old_fs); 407 408 if (ret > 0) { 409 if (put_compat_rusage(&r, ru)) 410 return -EFAULT; 411 if (stat_addr && put_user(status, stat_addr)) 412 return -EFAULT; 413 } 414 return ret; 415 } 416 } 417 418 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, 419 struct compat_siginfo __user *uinfo, int options, 420 struct compat_rusage __user *uru) 421 { 422 siginfo_t info; 423 struct rusage ru; 424 long ret; 425 mm_segment_t old_fs = get_fs(); 426 427 memset(&info, 0, sizeof(info)); 428 429 set_fs(KERNEL_DS); 430 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 431 uru ? (struct rusage __user *)&ru : NULL); 432 set_fs(old_fs); 433 434 if ((ret < 0) || (info.si_signo == 0)) 435 return ret; 436 437 if (uru) { 438 ret = put_compat_rusage(&ru, uru); 439 if (ret) 440 return ret; 441 } 442 443 BUG_ON(info.si_code & __SI_MASK); 444 info.si_code |= __SI_CHLD; 445 return copy_siginfo_to_user32(uinfo, &info); 446 } 447 448 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 449 unsigned len, struct cpumask *new_mask) 450 { 451 unsigned long *k; 452 453 if (len < cpumask_size()) 454 memset(new_mask, 0, cpumask_size()); 455 else if (len > cpumask_size()) 456 len = cpumask_size(); 457 458 k = cpumask_bits(new_mask); 459 return compat_get_bitmap(k, user_mask_ptr, len * 8); 460 } 461 462 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 463 unsigned int len, 464 compat_ulong_t __user *user_mask_ptr) 465 { 466 cpumask_var_t new_mask; 467 int retval; 468 469 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 470 return -ENOMEM; 471 472 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 473 if (retval) 474 goto out; 475 476 retval = sched_setaffinity(pid, new_mask); 477 out: 478 free_cpumask_var(new_mask); 479 return retval; 480 } 481 482 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 483 compat_ulong_t __user *user_mask_ptr) 484 { 485 int ret; 486 cpumask_var_t mask; 487 488 if ((len * BITS_PER_BYTE) < nr_cpu_ids) 489 return -EINVAL; 490 if (len & (sizeof(compat_ulong_t)-1)) 491 return -EINVAL; 492 493 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 494 return -ENOMEM; 495 496 ret = sched_getaffinity(pid, mask); 497 if (ret == 0) { 498 size_t retlen = min_t(size_t, len, cpumask_size()); 499 500 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) 501 ret = -EFAULT; 502 else 503 ret = retlen; 504 } 505 free_cpumask_var(mask); 506 507 return ret; 508 } 509 510 int get_compat_itimerspec(struct itimerspec *dst, 511 const struct compat_itimerspec __user *src) 512 { 513 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 514 get_compat_timespec(&dst->it_value, &src->it_value)) 515 return -EFAULT; 516 return 0; 517 } 518 519 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 520 const struct itimerspec *src) 521 { 522 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 523 put_compat_timespec(&src->it_value, &dst->it_value)) 524 return -EFAULT; 525 return 0; 526 } 527 528 long compat_sys_timer_create(clockid_t which_clock, 529 struct compat_sigevent __user *timer_event_spec, 530 timer_t __user *created_timer_id) 531 { 532 struct sigevent __user *event = NULL; 533 534 if (timer_event_spec) { 535 struct sigevent kevent; 536 537 event = compat_alloc_user_space(sizeof(*event)); 538 if (get_compat_sigevent(&kevent, timer_event_spec) || 539 copy_to_user(event, &kevent, sizeof(*event))) 540 return -EFAULT; 541 } 542 543 return sys_timer_create(which_clock, event, created_timer_id); 544 } 545 546 long compat_sys_timer_settime(timer_t timer_id, int flags, 547 struct compat_itimerspec __user *new, 548 struct compat_itimerspec __user *old) 549 { 550 long err; 551 mm_segment_t oldfs; 552 struct itimerspec newts, oldts; 553 554 if (!new) 555 return -EINVAL; 556 if (get_compat_itimerspec(&newts, new)) 557 return -EFAULT; 558 oldfs = get_fs(); 559 set_fs(KERNEL_DS); 560 err = sys_timer_settime(timer_id, flags, 561 (struct itimerspec __user *) &newts, 562 (struct itimerspec __user *) &oldts); 563 set_fs(oldfs); 564 if (!err && old && put_compat_itimerspec(old, &oldts)) 565 return -EFAULT; 566 return err; 567 } 568 569 long compat_sys_timer_gettime(timer_t timer_id, 570 struct compat_itimerspec __user *setting) 571 { 572 long err; 573 mm_segment_t oldfs; 574 struct itimerspec ts; 575 576 oldfs = get_fs(); 577 set_fs(KERNEL_DS); 578 err = sys_timer_gettime(timer_id, 579 (struct itimerspec __user *) &ts); 580 set_fs(oldfs); 581 if (!err && put_compat_itimerspec(setting, &ts)) 582 return -EFAULT; 583 return err; 584 } 585 586 long compat_sys_clock_settime(clockid_t which_clock, 587 struct compat_timespec __user *tp) 588 { 589 long err; 590 mm_segment_t oldfs; 591 struct timespec ts; 592 593 if (get_compat_timespec(&ts, tp)) 594 return -EFAULT; 595 oldfs = get_fs(); 596 set_fs(KERNEL_DS); 597 err = sys_clock_settime(which_clock, 598 (struct timespec __user *) &ts); 599 set_fs(oldfs); 600 return err; 601 } 602 603 long compat_sys_clock_gettime(clockid_t which_clock, 604 struct compat_timespec __user *tp) 605 { 606 long err; 607 mm_segment_t oldfs; 608 struct timespec ts; 609 610 oldfs = get_fs(); 611 set_fs(KERNEL_DS); 612 err = sys_clock_gettime(which_clock, 613 (struct timespec __user *) &ts); 614 set_fs(oldfs); 615 if (!err && put_compat_timespec(&ts, tp)) 616 return -EFAULT; 617 return err; 618 } 619 620 long compat_sys_clock_getres(clockid_t which_clock, 621 struct compat_timespec __user *tp) 622 { 623 long err; 624 mm_segment_t oldfs; 625 struct timespec ts; 626 627 oldfs = get_fs(); 628 set_fs(KERNEL_DS); 629 err = sys_clock_getres(which_clock, 630 (struct timespec __user *) &ts); 631 set_fs(oldfs); 632 if (!err && tp && put_compat_timespec(&ts, tp)) 633 return -EFAULT; 634 return err; 635 } 636 637 static long compat_clock_nanosleep_restart(struct restart_block *restart) 638 { 639 long err; 640 mm_segment_t oldfs; 641 struct timespec tu; 642 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp; 643 644 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 645 oldfs = get_fs(); 646 set_fs(KERNEL_DS); 647 err = clock_nanosleep_restart(restart); 648 set_fs(oldfs); 649 650 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 651 put_compat_timespec(&tu, rmtp)) 652 return -EFAULT; 653 654 if (err == -ERESTART_RESTARTBLOCK) { 655 restart->fn = compat_clock_nanosleep_restart; 656 restart->nanosleep.compat_rmtp = rmtp; 657 } 658 return err; 659 } 660 661 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 662 struct compat_timespec __user *rqtp, 663 struct compat_timespec __user *rmtp) 664 { 665 long err; 666 mm_segment_t oldfs; 667 struct timespec in, out; 668 struct restart_block *restart; 669 670 if (get_compat_timespec(&in, rqtp)) 671 return -EFAULT; 672 673 oldfs = get_fs(); 674 set_fs(KERNEL_DS); 675 err = sys_clock_nanosleep(which_clock, flags, 676 (struct timespec __user *) &in, 677 (struct timespec __user *) &out); 678 set_fs(oldfs); 679 680 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 681 put_compat_timespec(&out, rmtp)) 682 return -EFAULT; 683 684 if (err == -ERESTART_RESTARTBLOCK) { 685 restart = ¤t_thread_info()->restart_block; 686 restart->fn = compat_clock_nanosleep_restart; 687 restart->nanosleep.compat_rmtp = rmtp; 688 } 689 return err; 690 } 691 692 /* 693 * We currently only need the following fields from the sigevent 694 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 695 * sigev_notify_thread_id). The others are handled in user mode. 696 * We also assume that copying sigev_value.sival_int is sufficient 697 * to keep all the bits of sigev_value.sival_ptr intact. 698 */ 699 int get_compat_sigevent(struct sigevent *event, 700 const struct compat_sigevent __user *u_event) 701 { 702 memset(event, 0, sizeof(*event)); 703 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 704 __get_user(event->sigev_value.sival_int, 705 &u_event->sigev_value.sival_int) || 706 __get_user(event->sigev_signo, &u_event->sigev_signo) || 707 __get_user(event->sigev_notify, &u_event->sigev_notify) || 708 __get_user(event->sigev_notify_thread_id, 709 &u_event->sigev_notify_thread_id)) 710 ? -EFAULT : 0; 711 } 712 713 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 714 unsigned long bitmap_size) 715 { 716 int i, j; 717 unsigned long m; 718 compat_ulong_t um; 719 unsigned long nr_compat_longs; 720 721 /* align bitmap up to nearest compat_long_t boundary */ 722 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 723 724 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 725 return -EFAULT; 726 727 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 728 729 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 730 m = 0; 731 732 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 733 /* 734 * We dont want to read past the end of the userspace 735 * bitmap. We must however ensure the end of the 736 * kernel bitmap is zeroed. 737 */ 738 if (nr_compat_longs-- > 0) { 739 if (__get_user(um, umask)) 740 return -EFAULT; 741 } else { 742 um = 0; 743 } 744 745 umask++; 746 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 747 } 748 *mask++ = m; 749 } 750 751 return 0; 752 } 753 754 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 755 unsigned long bitmap_size) 756 { 757 int i, j; 758 unsigned long m; 759 compat_ulong_t um; 760 unsigned long nr_compat_longs; 761 762 /* align bitmap up to nearest compat_long_t boundary */ 763 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 764 765 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 766 return -EFAULT; 767 768 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 769 770 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 771 m = *mask++; 772 773 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 774 um = m; 775 776 /* 777 * We dont want to write past the end of the userspace 778 * bitmap. 779 */ 780 if (nr_compat_longs-- > 0) { 781 if (__put_user(um, umask)) 782 return -EFAULT; 783 } 784 785 umask++; 786 m >>= 4*sizeof(um); 787 m >>= 4*sizeof(um); 788 } 789 } 790 791 return 0; 792 } 793 794 void 795 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 796 { 797 switch (_NSIG_WORDS) { 798 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 799 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 800 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 801 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 802 } 803 } 804 805 asmlinkage long 806 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 807 struct compat_siginfo __user *uinfo, 808 struct compat_timespec __user *uts, compat_size_t sigsetsize) 809 { 810 compat_sigset_t s32; 811 sigset_t s; 812 int sig; 813 struct timespec t; 814 siginfo_t info; 815 long ret, timeout = 0; 816 817 if (sigsetsize != sizeof(sigset_t)) 818 return -EINVAL; 819 820 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 821 return -EFAULT; 822 sigset_from_compat(&s, &s32); 823 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); 824 signotset(&s); 825 826 if (uts) { 827 if (get_compat_timespec (&t, uts)) 828 return -EFAULT; 829 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 830 || t.tv_sec < 0) 831 return -EINVAL; 832 } 833 834 spin_lock_irq(¤t->sighand->siglock); 835 sig = dequeue_signal(current, &s, &info); 836 if (!sig) { 837 timeout = MAX_SCHEDULE_TIMEOUT; 838 if (uts) 839 timeout = timespec_to_jiffies(&t) 840 +(t.tv_sec || t.tv_nsec); 841 if (timeout) { 842 current->real_blocked = current->blocked; 843 sigandsets(¤t->blocked, ¤t->blocked, &s); 844 845 recalc_sigpending(); 846 spin_unlock_irq(¤t->sighand->siglock); 847 848 timeout = schedule_timeout_interruptible(timeout); 849 850 spin_lock_irq(¤t->sighand->siglock); 851 sig = dequeue_signal(current, &s, &info); 852 current->blocked = current->real_blocked; 853 siginitset(¤t->real_blocked, 0); 854 recalc_sigpending(); 855 } 856 } 857 spin_unlock_irq(¤t->sighand->siglock); 858 859 if (sig) { 860 ret = sig; 861 if (uinfo) { 862 if (copy_siginfo_to_user32(uinfo, &info)) 863 ret = -EFAULT; 864 } 865 }else { 866 ret = timeout?-EINTR:-EAGAIN; 867 } 868 return ret; 869 870 } 871 872 asmlinkage long 873 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig, 874 struct compat_siginfo __user *uinfo) 875 { 876 siginfo_t info; 877 878 if (copy_siginfo_from_user32(&info, uinfo)) 879 return -EFAULT; 880 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info); 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 return -EFAULT; 898 } 899 force_successful_syscall_return(); 900 return i; 901 } 902 903 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 904 { 905 struct timespec tv; 906 int err; 907 908 if (get_user(tv.tv_sec, tptr)) 909 return -EFAULT; 910 911 tv.tv_nsec = 0; 912 913 err = security_settime(&tv, NULL); 914 if (err) 915 return err; 916 917 do_settimeofday(&tv); 918 return 0; 919 } 920 921 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 922 923 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND 924 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) 925 { 926 sigset_t newset; 927 compat_sigset_t newset32; 928 929 /* XXX: Don't preclude handling different sized sigset_t's. */ 930 if (sigsetsize != sizeof(sigset_t)) 931 return -EINVAL; 932 933 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) 934 return -EFAULT; 935 sigset_from_compat(&newset, &newset32); 936 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 937 938 spin_lock_irq(¤t->sighand->siglock); 939 current->saved_sigmask = current->blocked; 940 current->blocked = newset; 941 recalc_sigpending(); 942 spin_unlock_irq(¤t->sighand->siglock); 943 944 current->state = TASK_INTERRUPTIBLE; 945 schedule(); 946 set_restore_sigmask(); 947 return -ERESTARTNOHAND; 948 } 949 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ 950 951 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) 952 { 953 struct timex txc; 954 int ret; 955 956 memset(&txc, 0, sizeof(struct timex)); 957 958 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || 959 __get_user(txc.modes, &utp->modes) || 960 __get_user(txc.offset, &utp->offset) || 961 __get_user(txc.freq, &utp->freq) || 962 __get_user(txc.maxerror, &utp->maxerror) || 963 __get_user(txc.esterror, &utp->esterror) || 964 __get_user(txc.status, &utp->status) || 965 __get_user(txc.constant, &utp->constant) || 966 __get_user(txc.precision, &utp->precision) || 967 __get_user(txc.tolerance, &utp->tolerance) || 968 __get_user(txc.time.tv_sec, &utp->time.tv_sec) || 969 __get_user(txc.time.tv_usec, &utp->time.tv_usec) || 970 __get_user(txc.tick, &utp->tick) || 971 __get_user(txc.ppsfreq, &utp->ppsfreq) || 972 __get_user(txc.jitter, &utp->jitter) || 973 __get_user(txc.shift, &utp->shift) || 974 __get_user(txc.stabil, &utp->stabil) || 975 __get_user(txc.jitcnt, &utp->jitcnt) || 976 __get_user(txc.calcnt, &utp->calcnt) || 977 __get_user(txc.errcnt, &utp->errcnt) || 978 __get_user(txc.stbcnt, &utp->stbcnt)) 979 return -EFAULT; 980 981 ret = do_adjtimex(&txc); 982 983 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || 984 __put_user(txc.modes, &utp->modes) || 985 __put_user(txc.offset, &utp->offset) || 986 __put_user(txc.freq, &utp->freq) || 987 __put_user(txc.maxerror, &utp->maxerror) || 988 __put_user(txc.esterror, &utp->esterror) || 989 __put_user(txc.status, &utp->status) || 990 __put_user(txc.constant, &utp->constant) || 991 __put_user(txc.precision, &utp->precision) || 992 __put_user(txc.tolerance, &utp->tolerance) || 993 __put_user(txc.time.tv_sec, &utp->time.tv_sec) || 994 __put_user(txc.time.tv_usec, &utp->time.tv_usec) || 995 __put_user(txc.tick, &utp->tick) || 996 __put_user(txc.ppsfreq, &utp->ppsfreq) || 997 __put_user(txc.jitter, &utp->jitter) || 998 __put_user(txc.shift, &utp->shift) || 999 __put_user(txc.stabil, &utp->stabil) || 1000 __put_user(txc.jitcnt, &utp->jitcnt) || 1001 __put_user(txc.calcnt, &utp->calcnt) || 1002 __put_user(txc.errcnt, &utp->errcnt) || 1003 __put_user(txc.stbcnt, &utp->stbcnt) || 1004 __put_user(txc.tai, &utp->tai)) 1005 ret = -EFAULT; 1006 1007 return ret; 1008 } 1009 1010 #ifdef CONFIG_NUMA 1011 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages, 1012 compat_uptr_t __user *pages32, 1013 const int __user *nodes, 1014 int __user *status, 1015 int flags) 1016 { 1017 const void __user * __user *pages; 1018 int i; 1019 1020 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1021 for (i = 0; i < nr_pages; i++) { 1022 compat_uptr_t p; 1023 1024 if (get_user(p, pages32 + i) || 1025 put_user(compat_ptr(p), pages + i)) 1026 return -EFAULT; 1027 } 1028 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1029 } 1030 1031 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, 1032 compat_ulong_t maxnode, 1033 const compat_ulong_t __user *old_nodes, 1034 const compat_ulong_t __user *new_nodes) 1035 { 1036 unsigned long __user *old = NULL; 1037 unsigned long __user *new = NULL; 1038 nodemask_t tmp_mask; 1039 unsigned long nr_bits; 1040 unsigned long size; 1041 1042 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1043 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1044 if (old_nodes) { 1045 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1046 return -EFAULT; 1047 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1048 if (new_nodes) 1049 new = old + size / sizeof(unsigned long); 1050 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1051 return -EFAULT; 1052 } 1053 if (new_nodes) { 1054 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1055 return -EFAULT; 1056 if (new == NULL) 1057 new = compat_alloc_user_space(size); 1058 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1059 return -EFAULT; 1060 } 1061 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1062 } 1063 #endif 1064 1065 struct compat_sysinfo { 1066 s32 uptime; 1067 u32 loads[3]; 1068 u32 totalram; 1069 u32 freeram; 1070 u32 sharedram; 1071 u32 bufferram; 1072 u32 totalswap; 1073 u32 freeswap; 1074 u16 procs; 1075 u16 pad; 1076 u32 totalhigh; 1077 u32 freehigh; 1078 u32 mem_unit; 1079 char _f[20-2*sizeof(u32)-sizeof(int)]; 1080 }; 1081 1082 asmlinkage long 1083 compat_sys_sysinfo(struct compat_sysinfo __user *info) 1084 { 1085 struct sysinfo s; 1086 1087 do_sysinfo(&s); 1088 1089 /* Check to see if any memory value is too large for 32-bit and scale 1090 * down if needed 1091 */ 1092 if ((s.totalram >> 32) || (s.totalswap >> 32)) { 1093 int bitcount = 0; 1094 1095 while (s.mem_unit < PAGE_SIZE) { 1096 s.mem_unit <<= 1; 1097 bitcount++; 1098 } 1099 1100 s.totalram >>= bitcount; 1101 s.freeram >>= bitcount; 1102 s.sharedram >>= bitcount; 1103 s.bufferram >>= bitcount; 1104 s.totalswap >>= bitcount; 1105 s.freeswap >>= bitcount; 1106 s.totalhigh >>= bitcount; 1107 s.freehigh >>= bitcount; 1108 } 1109 1110 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || 1111 __put_user (s.uptime, &info->uptime) || 1112 __put_user (s.loads[0], &info->loads[0]) || 1113 __put_user (s.loads[1], &info->loads[1]) || 1114 __put_user (s.loads[2], &info->loads[2]) || 1115 __put_user (s.totalram, &info->totalram) || 1116 __put_user (s.freeram, &info->freeram) || 1117 __put_user (s.sharedram, &info->sharedram) || 1118 __put_user (s.bufferram, &info->bufferram) || 1119 __put_user (s.totalswap, &info->totalswap) || 1120 __put_user (s.freeswap, &info->freeswap) || 1121 __put_user (s.procs, &info->procs) || 1122 __put_user (s.totalhigh, &info->totalhigh) || 1123 __put_user (s.freehigh, &info->freehigh) || 1124 __put_user (s.mem_unit, &info->mem_unit)) 1125 return -EFAULT; 1126 1127 return 0; 1128 } 1129 1130 /* 1131 * Allocate user-space memory for the duration of a single system call, 1132 * in order to marshall parameters inside a compat thunk. 1133 */ 1134 void __user *compat_alloc_user_space(unsigned long len) 1135 { 1136 void __user *ptr; 1137 1138 /* If len would occupy more than half of the entire compat space... */ 1139 if (unlikely(len > (((compat_uptr_t)~0) >> 1))) 1140 return NULL; 1141 1142 ptr = arch_compat_alloc_user_space(len); 1143 1144 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) 1145 return NULL; 1146 1147 return ptr; 1148 } 1149 EXPORT_SYMBOL_GPL(compat_alloc_user_space); 1150