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; 498 499 if ((len * BITS_PER_BYTE) < nr_cpu_ids) 500 return -EINVAL; 501 if (len & (sizeof(compat_ulong_t)-1)) 502 return -EINVAL; 503 504 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 505 return -ENOMEM; 506 507 ret = sched_getaffinity(pid, mask); 508 if (ret == 0) { 509 size_t retlen = min_t(size_t, len, cpumask_size()); 510 511 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) 512 ret = -EFAULT; 513 else 514 ret = retlen; 515 } 516 free_cpumask_var(mask); 517 518 return ret; 519 } 520 521 int get_compat_itimerspec(struct itimerspec *dst, 522 const struct compat_itimerspec __user *src) 523 { 524 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 525 get_compat_timespec(&dst->it_value, &src->it_value)) 526 return -EFAULT; 527 return 0; 528 } 529 530 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 531 const struct itimerspec *src) 532 { 533 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 534 put_compat_timespec(&src->it_value, &dst->it_value)) 535 return -EFAULT; 536 return 0; 537 } 538 539 long compat_sys_timer_create(clockid_t which_clock, 540 struct compat_sigevent __user *timer_event_spec, 541 timer_t __user *created_timer_id) 542 { 543 struct sigevent __user *event = NULL; 544 545 if (timer_event_spec) { 546 struct sigevent kevent; 547 548 event = compat_alloc_user_space(sizeof(*event)); 549 if (get_compat_sigevent(&kevent, timer_event_spec) || 550 copy_to_user(event, &kevent, sizeof(*event))) 551 return -EFAULT; 552 } 553 554 return sys_timer_create(which_clock, event, created_timer_id); 555 } 556 557 long compat_sys_timer_settime(timer_t timer_id, int flags, 558 struct compat_itimerspec __user *new, 559 struct compat_itimerspec __user *old) 560 { 561 long err; 562 mm_segment_t oldfs; 563 struct itimerspec newts, oldts; 564 565 if (!new) 566 return -EINVAL; 567 if (get_compat_itimerspec(&newts, new)) 568 return -EFAULT; 569 oldfs = get_fs(); 570 set_fs(KERNEL_DS); 571 err = sys_timer_settime(timer_id, flags, 572 (struct itimerspec __user *) &newts, 573 (struct itimerspec __user *) &oldts); 574 set_fs(oldfs); 575 if (!err && old && put_compat_itimerspec(old, &oldts)) 576 return -EFAULT; 577 return err; 578 } 579 580 long compat_sys_timer_gettime(timer_t timer_id, 581 struct compat_itimerspec __user *setting) 582 { 583 long err; 584 mm_segment_t oldfs; 585 struct itimerspec ts; 586 587 oldfs = get_fs(); 588 set_fs(KERNEL_DS); 589 err = sys_timer_gettime(timer_id, 590 (struct itimerspec __user *) &ts); 591 set_fs(oldfs); 592 if (!err && put_compat_itimerspec(setting, &ts)) 593 return -EFAULT; 594 return err; 595 } 596 597 long compat_sys_clock_settime(clockid_t which_clock, 598 struct compat_timespec __user *tp) 599 { 600 long err; 601 mm_segment_t oldfs; 602 struct timespec ts; 603 604 if (get_compat_timespec(&ts, tp)) 605 return -EFAULT; 606 oldfs = get_fs(); 607 set_fs(KERNEL_DS); 608 err = sys_clock_settime(which_clock, 609 (struct timespec __user *) &ts); 610 set_fs(oldfs); 611 return err; 612 } 613 614 long compat_sys_clock_gettime(clockid_t which_clock, 615 struct compat_timespec __user *tp) 616 { 617 long err; 618 mm_segment_t oldfs; 619 struct timespec ts; 620 621 oldfs = get_fs(); 622 set_fs(KERNEL_DS); 623 err = sys_clock_gettime(which_clock, 624 (struct timespec __user *) &ts); 625 set_fs(oldfs); 626 if (!err && put_compat_timespec(&ts, tp)) 627 return -EFAULT; 628 return err; 629 } 630 631 long compat_sys_clock_getres(clockid_t which_clock, 632 struct compat_timespec __user *tp) 633 { 634 long err; 635 mm_segment_t oldfs; 636 struct timespec ts; 637 638 oldfs = get_fs(); 639 set_fs(KERNEL_DS); 640 err = sys_clock_getres(which_clock, 641 (struct timespec __user *) &ts); 642 set_fs(oldfs); 643 if (!err && tp && put_compat_timespec(&ts, tp)) 644 return -EFAULT; 645 return err; 646 } 647 648 static long compat_clock_nanosleep_restart(struct restart_block *restart) 649 { 650 long err; 651 mm_segment_t oldfs; 652 struct timespec tu; 653 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp; 654 655 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 656 oldfs = get_fs(); 657 set_fs(KERNEL_DS); 658 err = clock_nanosleep_restart(restart); 659 set_fs(oldfs); 660 661 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 662 put_compat_timespec(&tu, rmtp)) 663 return -EFAULT; 664 665 if (err == -ERESTART_RESTARTBLOCK) { 666 restart->fn = compat_clock_nanosleep_restart; 667 restart->nanosleep.compat_rmtp = rmtp; 668 } 669 return err; 670 } 671 672 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 673 struct compat_timespec __user *rqtp, 674 struct compat_timespec __user *rmtp) 675 { 676 long err; 677 mm_segment_t oldfs; 678 struct timespec in, out; 679 struct restart_block *restart; 680 681 if (get_compat_timespec(&in, rqtp)) 682 return -EFAULT; 683 684 oldfs = get_fs(); 685 set_fs(KERNEL_DS); 686 err = sys_clock_nanosleep(which_clock, flags, 687 (struct timespec __user *) &in, 688 (struct timespec __user *) &out); 689 set_fs(oldfs); 690 691 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 692 put_compat_timespec(&out, rmtp)) 693 return -EFAULT; 694 695 if (err == -ERESTART_RESTARTBLOCK) { 696 restart = ¤t_thread_info()->restart_block; 697 restart->fn = compat_clock_nanosleep_restart; 698 restart->nanosleep.compat_rmtp = rmtp; 699 } 700 return err; 701 } 702 703 /* 704 * We currently only need the following fields from the sigevent 705 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 706 * sigev_notify_thread_id). The others are handled in user mode. 707 * We also assume that copying sigev_value.sival_int is sufficient 708 * to keep all the bits of sigev_value.sival_ptr intact. 709 */ 710 int get_compat_sigevent(struct sigevent *event, 711 const struct compat_sigevent __user *u_event) 712 { 713 memset(event, 0, sizeof(*event)); 714 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 715 __get_user(event->sigev_value.sival_int, 716 &u_event->sigev_value.sival_int) || 717 __get_user(event->sigev_signo, &u_event->sigev_signo) || 718 __get_user(event->sigev_notify, &u_event->sigev_notify) || 719 __get_user(event->sigev_notify_thread_id, 720 &u_event->sigev_notify_thread_id)) 721 ? -EFAULT : 0; 722 } 723 724 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 725 unsigned long bitmap_size) 726 { 727 int i, j; 728 unsigned long m; 729 compat_ulong_t um; 730 unsigned long nr_compat_longs; 731 732 /* align bitmap up to nearest compat_long_t boundary */ 733 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 734 735 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 736 return -EFAULT; 737 738 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 739 740 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 741 m = 0; 742 743 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 744 /* 745 * We dont want to read past the end of the userspace 746 * bitmap. We must however ensure the end of the 747 * kernel bitmap is zeroed. 748 */ 749 if (nr_compat_longs-- > 0) { 750 if (__get_user(um, umask)) 751 return -EFAULT; 752 } else { 753 um = 0; 754 } 755 756 umask++; 757 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 758 } 759 *mask++ = m; 760 } 761 762 return 0; 763 } 764 765 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 766 unsigned long bitmap_size) 767 { 768 int i, j; 769 unsigned long m; 770 compat_ulong_t um; 771 unsigned long nr_compat_longs; 772 773 /* align bitmap up to nearest compat_long_t boundary */ 774 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 775 776 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 777 return -EFAULT; 778 779 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 780 781 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 782 m = *mask++; 783 784 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 785 um = m; 786 787 /* 788 * We dont want to write past the end of the userspace 789 * bitmap. 790 */ 791 if (nr_compat_longs-- > 0) { 792 if (__put_user(um, umask)) 793 return -EFAULT; 794 } 795 796 umask++; 797 m >>= 4*sizeof(um); 798 m >>= 4*sizeof(um); 799 } 800 } 801 802 return 0; 803 } 804 805 void 806 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 807 { 808 switch (_NSIG_WORDS) { 809 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 810 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 811 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 812 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 813 } 814 } 815 816 asmlinkage long 817 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 818 struct compat_siginfo __user *uinfo, 819 struct compat_timespec __user *uts, compat_size_t sigsetsize) 820 { 821 compat_sigset_t s32; 822 sigset_t s; 823 int sig; 824 struct timespec t; 825 siginfo_t info; 826 long ret, timeout = 0; 827 828 if (sigsetsize != sizeof(sigset_t)) 829 return -EINVAL; 830 831 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 832 return -EFAULT; 833 sigset_from_compat(&s, &s32); 834 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); 835 signotset(&s); 836 837 if (uts) { 838 if (get_compat_timespec (&t, uts)) 839 return -EFAULT; 840 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 841 || t.tv_sec < 0) 842 return -EINVAL; 843 } 844 845 spin_lock_irq(¤t->sighand->siglock); 846 sig = dequeue_signal(current, &s, &info); 847 if (!sig) { 848 timeout = MAX_SCHEDULE_TIMEOUT; 849 if (uts) 850 timeout = timespec_to_jiffies(&t) 851 +(t.tv_sec || t.tv_nsec); 852 if (timeout) { 853 current->real_blocked = current->blocked; 854 sigandsets(¤t->blocked, ¤t->blocked, &s); 855 856 recalc_sigpending(); 857 spin_unlock_irq(¤t->sighand->siglock); 858 859 timeout = schedule_timeout_interruptible(timeout); 860 861 spin_lock_irq(¤t->sighand->siglock); 862 sig = dequeue_signal(current, &s, &info); 863 current->blocked = current->real_blocked; 864 siginitset(¤t->real_blocked, 0); 865 recalc_sigpending(); 866 } 867 } 868 spin_unlock_irq(¤t->sighand->siglock); 869 870 if (sig) { 871 ret = sig; 872 if (uinfo) { 873 if (copy_siginfo_to_user32(uinfo, &info)) 874 ret = -EFAULT; 875 } 876 }else { 877 ret = timeout?-EINTR:-EAGAIN; 878 } 879 return ret; 880 881 } 882 883 asmlinkage long 884 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig, 885 struct compat_siginfo __user *uinfo) 886 { 887 siginfo_t info; 888 889 if (copy_siginfo_from_user32(&info, uinfo)) 890 return -EFAULT; 891 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info); 892 } 893 894 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 895 896 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 897 898 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 899 { 900 compat_time_t i; 901 struct timeval tv; 902 903 do_gettimeofday(&tv); 904 i = tv.tv_sec; 905 906 if (tloc) { 907 if (put_user(i,tloc)) 908 return -EFAULT; 909 } 910 force_successful_syscall_return(); 911 return i; 912 } 913 914 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 915 { 916 struct timespec tv; 917 int err; 918 919 if (get_user(tv.tv_sec, tptr)) 920 return -EFAULT; 921 922 tv.tv_nsec = 0; 923 924 err = security_settime(&tv, NULL); 925 if (err) 926 return err; 927 928 do_settimeofday(&tv); 929 return 0; 930 } 931 932 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 933 934 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND 935 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) 936 { 937 sigset_t newset; 938 compat_sigset_t newset32; 939 940 /* XXX: Don't preclude handling different sized sigset_t's. */ 941 if (sigsetsize != sizeof(sigset_t)) 942 return -EINVAL; 943 944 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) 945 return -EFAULT; 946 sigset_from_compat(&newset, &newset32); 947 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 948 949 spin_lock_irq(¤t->sighand->siglock); 950 current->saved_sigmask = current->blocked; 951 current->blocked = newset; 952 recalc_sigpending(); 953 spin_unlock_irq(¤t->sighand->siglock); 954 955 current->state = TASK_INTERRUPTIBLE; 956 schedule(); 957 set_restore_sigmask(); 958 return -ERESTARTNOHAND; 959 } 960 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ 961 962 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) 963 { 964 struct timex txc; 965 int ret; 966 967 memset(&txc, 0, sizeof(struct timex)); 968 969 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || 970 __get_user(txc.modes, &utp->modes) || 971 __get_user(txc.offset, &utp->offset) || 972 __get_user(txc.freq, &utp->freq) || 973 __get_user(txc.maxerror, &utp->maxerror) || 974 __get_user(txc.esterror, &utp->esterror) || 975 __get_user(txc.status, &utp->status) || 976 __get_user(txc.constant, &utp->constant) || 977 __get_user(txc.precision, &utp->precision) || 978 __get_user(txc.tolerance, &utp->tolerance) || 979 __get_user(txc.time.tv_sec, &utp->time.tv_sec) || 980 __get_user(txc.time.tv_usec, &utp->time.tv_usec) || 981 __get_user(txc.tick, &utp->tick) || 982 __get_user(txc.ppsfreq, &utp->ppsfreq) || 983 __get_user(txc.jitter, &utp->jitter) || 984 __get_user(txc.shift, &utp->shift) || 985 __get_user(txc.stabil, &utp->stabil) || 986 __get_user(txc.jitcnt, &utp->jitcnt) || 987 __get_user(txc.calcnt, &utp->calcnt) || 988 __get_user(txc.errcnt, &utp->errcnt) || 989 __get_user(txc.stbcnt, &utp->stbcnt)) 990 return -EFAULT; 991 992 ret = do_adjtimex(&txc); 993 994 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || 995 __put_user(txc.modes, &utp->modes) || 996 __put_user(txc.offset, &utp->offset) || 997 __put_user(txc.freq, &utp->freq) || 998 __put_user(txc.maxerror, &utp->maxerror) || 999 __put_user(txc.esterror, &utp->esterror) || 1000 __put_user(txc.status, &utp->status) || 1001 __put_user(txc.constant, &utp->constant) || 1002 __put_user(txc.precision, &utp->precision) || 1003 __put_user(txc.tolerance, &utp->tolerance) || 1004 __put_user(txc.time.tv_sec, &utp->time.tv_sec) || 1005 __put_user(txc.time.tv_usec, &utp->time.tv_usec) || 1006 __put_user(txc.tick, &utp->tick) || 1007 __put_user(txc.ppsfreq, &utp->ppsfreq) || 1008 __put_user(txc.jitter, &utp->jitter) || 1009 __put_user(txc.shift, &utp->shift) || 1010 __put_user(txc.stabil, &utp->stabil) || 1011 __put_user(txc.jitcnt, &utp->jitcnt) || 1012 __put_user(txc.calcnt, &utp->calcnt) || 1013 __put_user(txc.errcnt, &utp->errcnt) || 1014 __put_user(txc.stbcnt, &utp->stbcnt) || 1015 __put_user(txc.tai, &utp->tai)) 1016 ret = -EFAULT; 1017 1018 return ret; 1019 } 1020 1021 #ifdef CONFIG_NUMA 1022 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages, 1023 compat_uptr_t __user *pages32, 1024 const int __user *nodes, 1025 int __user *status, 1026 int flags) 1027 { 1028 const void __user * __user *pages; 1029 int i; 1030 1031 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1032 for (i = 0; i < nr_pages; i++) { 1033 compat_uptr_t p; 1034 1035 if (get_user(p, pages32 + i) || 1036 put_user(compat_ptr(p), pages + i)) 1037 return -EFAULT; 1038 } 1039 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1040 } 1041 1042 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, 1043 compat_ulong_t maxnode, 1044 const compat_ulong_t __user *old_nodes, 1045 const compat_ulong_t __user *new_nodes) 1046 { 1047 unsigned long __user *old = NULL; 1048 unsigned long __user *new = NULL; 1049 nodemask_t tmp_mask; 1050 unsigned long nr_bits; 1051 unsigned long size; 1052 1053 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1054 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1055 if (old_nodes) { 1056 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1057 return -EFAULT; 1058 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1059 if (new_nodes) 1060 new = old + size / sizeof(unsigned long); 1061 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1062 return -EFAULT; 1063 } 1064 if (new_nodes) { 1065 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1066 return -EFAULT; 1067 if (new == NULL) 1068 new = compat_alloc_user_space(size); 1069 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1070 return -EFAULT; 1071 } 1072 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1073 } 1074 #endif 1075 1076 struct compat_sysinfo { 1077 s32 uptime; 1078 u32 loads[3]; 1079 u32 totalram; 1080 u32 freeram; 1081 u32 sharedram; 1082 u32 bufferram; 1083 u32 totalswap; 1084 u32 freeswap; 1085 u16 procs; 1086 u16 pad; 1087 u32 totalhigh; 1088 u32 freehigh; 1089 u32 mem_unit; 1090 char _f[20-2*sizeof(u32)-sizeof(int)]; 1091 }; 1092 1093 asmlinkage long 1094 compat_sys_sysinfo(struct compat_sysinfo __user *info) 1095 { 1096 struct sysinfo s; 1097 1098 do_sysinfo(&s); 1099 1100 /* Check to see if any memory value is too large for 32-bit and scale 1101 * down if needed 1102 */ 1103 if ((s.totalram >> 32) || (s.totalswap >> 32)) { 1104 int bitcount = 0; 1105 1106 while (s.mem_unit < PAGE_SIZE) { 1107 s.mem_unit <<= 1; 1108 bitcount++; 1109 } 1110 1111 s.totalram >>= bitcount; 1112 s.freeram >>= bitcount; 1113 s.sharedram >>= bitcount; 1114 s.bufferram >>= bitcount; 1115 s.totalswap >>= bitcount; 1116 s.freeswap >>= bitcount; 1117 s.totalhigh >>= bitcount; 1118 s.freehigh >>= bitcount; 1119 } 1120 1121 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || 1122 __put_user (s.uptime, &info->uptime) || 1123 __put_user (s.loads[0], &info->loads[0]) || 1124 __put_user (s.loads[1], &info->loads[1]) || 1125 __put_user (s.loads[2], &info->loads[2]) || 1126 __put_user (s.totalram, &info->totalram) || 1127 __put_user (s.freeram, &info->freeram) || 1128 __put_user (s.sharedram, &info->sharedram) || 1129 __put_user (s.bufferram, &info->bufferram) || 1130 __put_user (s.totalswap, &info->totalswap) || 1131 __put_user (s.freeswap, &info->freeswap) || 1132 __put_user (s.procs, &info->procs) || 1133 __put_user (s.totalhigh, &info->totalhigh) || 1134 __put_user (s.freehigh, &info->freehigh) || 1135 __put_user (s.mem_unit, &info->mem_unit)) 1136 return -EFAULT; 1137 1138 return 0; 1139 } 1140