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/futex.h> /* for FUTEX_WAIT */ 21 #include <linux/syscalls.h> 22 #include <linux/unistd.h> 23 #include <linux/security.h> 24 25 #include <asm/uaccess.h> 26 #include <asm/bug.h> 27 28 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts) 29 { 30 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || 31 __get_user(ts->tv_sec, &cts->tv_sec) || 32 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 33 } 34 35 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts) 36 { 37 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || 38 __put_user(ts->tv_sec, &cts->tv_sec) || 39 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 40 } 41 42 static long compat_nanosleep_restart(struct restart_block *restart) 43 { 44 unsigned long expire = restart->arg0, now = jiffies; 45 struct compat_timespec __user *rmtp; 46 47 /* Did it expire while we handled signals? */ 48 if (!time_after(expire, now)) 49 return 0; 50 51 current->state = TASK_INTERRUPTIBLE; 52 expire = schedule_timeout(expire - now); 53 if (expire == 0) 54 return 0; 55 56 rmtp = (struct compat_timespec __user *)restart->arg1; 57 if (rmtp) { 58 struct compat_timespec ct; 59 struct timespec t; 60 61 jiffies_to_timespec(expire, &t); 62 ct.tv_sec = t.tv_sec; 63 ct.tv_nsec = t.tv_nsec; 64 if (copy_to_user(rmtp, &ct, sizeof(ct))) 65 return -EFAULT; 66 } 67 /* The 'restart' block is already filled in */ 68 return -ERESTART_RESTARTBLOCK; 69 } 70 71 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, 72 struct compat_timespec __user *rmtp) 73 { 74 struct timespec t; 75 struct restart_block *restart; 76 unsigned long expire; 77 78 if (get_compat_timespec(&t, rqtp)) 79 return -EFAULT; 80 81 if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0)) 82 return -EINVAL; 83 84 expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec); 85 current->state = TASK_INTERRUPTIBLE; 86 expire = schedule_timeout(expire); 87 if (expire == 0) 88 return 0; 89 90 if (rmtp) { 91 jiffies_to_timespec(expire, &t); 92 if (put_compat_timespec(&t, rmtp)) 93 return -EFAULT; 94 } 95 restart = ¤t_thread_info()->restart_block; 96 restart->fn = compat_nanosleep_restart; 97 restart->arg0 = jiffies + expire; 98 restart->arg1 = (unsigned long) rmtp; 99 return -ERESTART_RESTARTBLOCK; 100 } 101 102 static inline long get_compat_itimerval(struct itimerval *o, 103 struct compat_itimerval __user *i) 104 { 105 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 106 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 107 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 108 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 109 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 110 } 111 112 static inline long put_compat_itimerval(struct compat_itimerval __user *o, 113 struct itimerval *i) 114 { 115 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 116 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 117 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 118 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 119 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 120 } 121 122 asmlinkage long compat_sys_getitimer(int which, 123 struct compat_itimerval __user *it) 124 { 125 struct itimerval kit; 126 int error; 127 128 error = do_getitimer(which, &kit); 129 if (!error && put_compat_itimerval(it, &kit)) 130 error = -EFAULT; 131 return error; 132 } 133 134 asmlinkage long compat_sys_setitimer(int which, 135 struct compat_itimerval __user *in, 136 struct compat_itimerval __user *out) 137 { 138 struct itimerval kin, kout; 139 int error; 140 141 if (in) { 142 if (get_compat_itimerval(&kin, in)) 143 return -EFAULT; 144 } else 145 memset(&kin, 0, sizeof(kin)); 146 147 error = do_setitimer(which, &kin, out ? &kout : NULL); 148 if (error || !out) 149 return error; 150 if (put_compat_itimerval(out, &kout)) 151 return -EFAULT; 152 return 0; 153 } 154 155 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) 156 { 157 /* 158 * In the SMP world we might just be unlucky and have one of 159 * the times increment as we use it. Since the value is an 160 * atomically safe type this is just fine. Conceptually its 161 * as if the syscall took an instant longer to occur. 162 */ 163 if (tbuf) { 164 struct compat_tms tmp; 165 struct task_struct *tsk = current; 166 struct task_struct *t; 167 cputime_t utime, stime, cutime, cstime; 168 169 read_lock(&tasklist_lock); 170 utime = tsk->signal->utime; 171 stime = tsk->signal->stime; 172 t = tsk; 173 do { 174 utime = cputime_add(utime, t->utime); 175 stime = cputime_add(stime, t->stime); 176 t = next_thread(t); 177 } while (t != tsk); 178 179 /* 180 * While we have tasklist_lock read-locked, no dying thread 181 * can be updating current->signal->[us]time. Instead, 182 * we got their counts included in the live thread loop. 183 * However, another thread can come in right now and 184 * do a wait call that updates current->signal->c[us]time. 185 * To make sure we always see that pair updated atomically, 186 * we take the siglock around fetching them. 187 */ 188 spin_lock_irq(&tsk->sighand->siglock); 189 cutime = tsk->signal->cutime; 190 cstime = tsk->signal->cstime; 191 spin_unlock_irq(&tsk->sighand->siglock); 192 read_unlock(&tasklist_lock); 193 194 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime)); 195 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime)); 196 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime)); 197 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime)); 198 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 199 return -EFAULT; 200 } 201 return compat_jiffies_to_clock_t(jiffies); 202 } 203 204 /* 205 * Assumption: old_sigset_t and compat_old_sigset_t are both 206 * types that can be passed to put_user()/get_user(). 207 */ 208 209 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) 210 { 211 old_sigset_t s; 212 long ret; 213 mm_segment_t old_fs = get_fs(); 214 215 set_fs(KERNEL_DS); 216 ret = sys_sigpending((old_sigset_t __user *) &s); 217 set_fs(old_fs); 218 if (ret == 0) 219 ret = put_user(s, set); 220 return ret; 221 } 222 223 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set, 224 compat_old_sigset_t __user *oset) 225 { 226 old_sigset_t s; 227 long ret; 228 mm_segment_t old_fs; 229 230 if (set && get_user(s, set)) 231 return -EFAULT; 232 old_fs = get_fs(); 233 set_fs(KERNEL_DS); 234 ret = sys_sigprocmask(how, 235 set ? (old_sigset_t __user *) &s : NULL, 236 oset ? (old_sigset_t __user *) &s : NULL); 237 set_fs(old_fs); 238 if (ret == 0) 239 if (oset) 240 ret = put_user(s, oset); 241 return ret; 242 } 243 244 #ifdef CONFIG_FUTEX 245 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, int val, 246 struct compat_timespec __user *utime, u32 __user *uaddr2, 247 int val3) 248 { 249 struct timespec t; 250 unsigned long timeout = MAX_SCHEDULE_TIMEOUT; 251 int val2 = 0; 252 253 if ((op == FUTEX_WAIT) && utime) { 254 if (get_compat_timespec(&t, utime)) 255 return -EFAULT; 256 timeout = timespec_to_jiffies(&t) + 1; 257 } 258 if (op >= FUTEX_REQUEUE) 259 val2 = (int) (unsigned long) utime; 260 261 return do_futex((unsigned long)uaddr, op, val, timeout, 262 (unsigned long)uaddr2, val2, val3); 263 } 264 #endif 265 266 asmlinkage long compat_sys_setrlimit(unsigned int resource, 267 struct compat_rlimit __user *rlim) 268 { 269 struct rlimit r; 270 int ret; 271 mm_segment_t old_fs = get_fs (); 272 273 if (resource >= RLIM_NLIMITS) 274 return -EINVAL; 275 276 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 277 __get_user(r.rlim_cur, &rlim->rlim_cur) || 278 __get_user(r.rlim_max, &rlim->rlim_max)) 279 return -EFAULT; 280 281 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 282 r.rlim_cur = RLIM_INFINITY; 283 if (r.rlim_max == COMPAT_RLIM_INFINITY) 284 r.rlim_max = RLIM_INFINITY; 285 set_fs(KERNEL_DS); 286 ret = sys_setrlimit(resource, (struct rlimit __user *) &r); 287 set_fs(old_fs); 288 return ret; 289 } 290 291 #ifdef COMPAT_RLIM_OLD_INFINITY 292 293 asmlinkage long compat_sys_old_getrlimit(unsigned int resource, 294 struct compat_rlimit __user *rlim) 295 { 296 struct rlimit r; 297 int ret; 298 mm_segment_t old_fs = get_fs(); 299 300 set_fs(KERNEL_DS); 301 ret = sys_old_getrlimit(resource, &r); 302 set_fs(old_fs); 303 304 if (!ret) { 305 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 306 r.rlim_cur = COMPAT_RLIM_INFINITY; 307 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 308 r.rlim_max = COMPAT_RLIM_INFINITY; 309 310 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 311 __put_user(r.rlim_cur, &rlim->rlim_cur) || 312 __put_user(r.rlim_max, &rlim->rlim_max)) 313 return -EFAULT; 314 } 315 return ret; 316 } 317 318 #endif 319 320 asmlinkage long compat_sys_getrlimit (unsigned int resource, 321 struct compat_rlimit __user *rlim) 322 { 323 struct rlimit r; 324 int ret; 325 mm_segment_t old_fs = get_fs(); 326 327 set_fs(KERNEL_DS); 328 ret = sys_getrlimit(resource, (struct rlimit __user *) &r); 329 set_fs(old_fs); 330 if (!ret) { 331 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 332 r.rlim_cur = COMPAT_RLIM_INFINITY; 333 if (r.rlim_max > COMPAT_RLIM_INFINITY) 334 r.rlim_max = COMPAT_RLIM_INFINITY; 335 336 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 337 __put_user(r.rlim_cur, &rlim->rlim_cur) || 338 __put_user(r.rlim_max, &rlim->rlim_max)) 339 return -EFAULT; 340 } 341 return ret; 342 } 343 344 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 345 { 346 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 347 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 348 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 349 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 350 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 351 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 352 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 353 __put_user(r->ru_idrss, &ru->ru_idrss) || 354 __put_user(r->ru_isrss, &ru->ru_isrss) || 355 __put_user(r->ru_minflt, &ru->ru_minflt) || 356 __put_user(r->ru_majflt, &ru->ru_majflt) || 357 __put_user(r->ru_nswap, &ru->ru_nswap) || 358 __put_user(r->ru_inblock, &ru->ru_inblock) || 359 __put_user(r->ru_oublock, &ru->ru_oublock) || 360 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 361 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 362 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 363 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 364 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 365 return -EFAULT; 366 return 0; 367 } 368 369 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) 370 { 371 struct rusage r; 372 int ret; 373 mm_segment_t old_fs = get_fs(); 374 375 set_fs(KERNEL_DS); 376 ret = sys_getrusage(who, (struct rusage __user *) &r); 377 set_fs(old_fs); 378 379 if (ret) 380 return ret; 381 382 if (put_compat_rusage(&r, ru)) 383 return -EFAULT; 384 385 return 0; 386 } 387 388 asmlinkage long 389 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, 390 struct compat_rusage __user *ru) 391 { 392 if (!ru) { 393 return sys_wait4(pid, stat_addr, options, NULL); 394 } else { 395 struct rusage r; 396 int ret; 397 unsigned int status; 398 mm_segment_t old_fs = get_fs(); 399 400 set_fs (KERNEL_DS); 401 ret = sys_wait4(pid, 402 (stat_addr ? 403 (unsigned int __user *) &status : NULL), 404 options, (struct rusage __user *) &r); 405 set_fs (old_fs); 406 407 if (ret > 0) { 408 if (put_compat_rusage(&r, ru)) 409 return -EFAULT; 410 if (stat_addr && put_user(status, stat_addr)) 411 return -EFAULT; 412 } 413 return ret; 414 } 415 } 416 417 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, 418 struct compat_siginfo __user *uinfo, int options, 419 struct compat_rusage __user *uru) 420 { 421 siginfo_t info; 422 struct rusage ru; 423 long ret; 424 mm_segment_t old_fs = get_fs(); 425 426 memset(&info, 0, sizeof(info)); 427 428 set_fs(KERNEL_DS); 429 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 430 uru ? (struct rusage __user *)&ru : NULL); 431 set_fs(old_fs); 432 433 if ((ret < 0) || (info.si_signo == 0)) 434 return ret; 435 436 if (uru) { 437 ret = put_compat_rusage(&ru, uru); 438 if (ret) 439 return ret; 440 } 441 442 BUG_ON(info.si_code & __SI_MASK); 443 info.si_code |= __SI_CHLD; 444 return copy_siginfo_to_user32(uinfo, &info); 445 } 446 447 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 448 unsigned len, cpumask_t *new_mask) 449 { 450 unsigned long *k; 451 452 if (len < sizeof(cpumask_t)) 453 memset(new_mask, 0, sizeof(cpumask_t)); 454 else if (len > sizeof(cpumask_t)) 455 len = sizeof(cpumask_t); 456 457 k = cpus_addr(*new_mask); 458 return compat_get_bitmap(k, user_mask_ptr, len * 8); 459 } 460 461 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 462 unsigned int len, 463 compat_ulong_t __user *user_mask_ptr) 464 { 465 cpumask_t new_mask; 466 int retval; 467 468 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask); 469 if (retval) 470 return retval; 471 472 return sched_setaffinity(pid, new_mask); 473 } 474 475 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 476 compat_ulong_t __user *user_mask_ptr) 477 { 478 int ret; 479 cpumask_t mask; 480 unsigned long *k; 481 unsigned int min_length = sizeof(cpumask_t); 482 483 if (NR_CPUS <= BITS_PER_COMPAT_LONG) 484 min_length = sizeof(compat_ulong_t); 485 486 if (len < min_length) 487 return -EINVAL; 488 489 ret = sched_getaffinity(pid, &mask); 490 if (ret < 0) 491 return ret; 492 493 k = cpus_addr(mask); 494 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); 495 if (ret) 496 return ret; 497 498 return min_length; 499 } 500 501 static int get_compat_itimerspec(struct itimerspec *dst, 502 struct compat_itimerspec __user *src) 503 { 504 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 505 get_compat_timespec(&dst->it_value, &src->it_value)) 506 return -EFAULT; 507 return 0; 508 } 509 510 static int put_compat_itimerspec(struct compat_itimerspec __user *dst, 511 struct itimerspec *src) 512 { 513 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 514 put_compat_timespec(&src->it_value, &dst->it_value)) 515 return -EFAULT; 516 return 0; 517 } 518 519 long compat_sys_timer_settime(timer_t timer_id, int flags, 520 struct compat_itimerspec __user *new, 521 struct compat_itimerspec __user *old) 522 { 523 long err; 524 mm_segment_t oldfs; 525 struct itimerspec newts, oldts; 526 527 if (!new) 528 return -EINVAL; 529 if (get_compat_itimerspec(&newts, new)) 530 return -EFAULT; 531 oldfs = get_fs(); 532 set_fs(KERNEL_DS); 533 err = sys_timer_settime(timer_id, flags, 534 (struct itimerspec __user *) &newts, 535 (struct itimerspec __user *) &oldts); 536 set_fs(oldfs); 537 if (!err && old && put_compat_itimerspec(old, &oldts)) 538 return -EFAULT; 539 return err; 540 } 541 542 long compat_sys_timer_gettime(timer_t timer_id, 543 struct compat_itimerspec __user *setting) 544 { 545 long err; 546 mm_segment_t oldfs; 547 struct itimerspec ts; 548 549 oldfs = get_fs(); 550 set_fs(KERNEL_DS); 551 err = sys_timer_gettime(timer_id, 552 (struct itimerspec __user *) &ts); 553 set_fs(oldfs); 554 if (!err && put_compat_itimerspec(setting, &ts)) 555 return -EFAULT; 556 return err; 557 } 558 559 long compat_sys_clock_settime(clockid_t which_clock, 560 struct compat_timespec __user *tp) 561 { 562 long err; 563 mm_segment_t oldfs; 564 struct timespec ts; 565 566 if (get_compat_timespec(&ts, tp)) 567 return -EFAULT; 568 oldfs = get_fs(); 569 set_fs(KERNEL_DS); 570 err = sys_clock_settime(which_clock, 571 (struct timespec __user *) &ts); 572 set_fs(oldfs); 573 return err; 574 } 575 576 long compat_sys_clock_gettime(clockid_t which_clock, 577 struct compat_timespec __user *tp) 578 { 579 long err; 580 mm_segment_t oldfs; 581 struct timespec ts; 582 583 oldfs = get_fs(); 584 set_fs(KERNEL_DS); 585 err = sys_clock_gettime(which_clock, 586 (struct timespec __user *) &ts); 587 set_fs(oldfs); 588 if (!err && put_compat_timespec(&ts, tp)) 589 return -EFAULT; 590 return err; 591 } 592 593 long compat_sys_clock_getres(clockid_t which_clock, 594 struct compat_timespec __user *tp) 595 { 596 long err; 597 mm_segment_t oldfs; 598 struct timespec ts; 599 600 oldfs = get_fs(); 601 set_fs(KERNEL_DS); 602 err = sys_clock_getres(which_clock, 603 (struct timespec __user *) &ts); 604 set_fs(oldfs); 605 if (!err && tp && put_compat_timespec(&ts, tp)) 606 return -EFAULT; 607 return err; 608 } 609 610 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 611 struct compat_timespec __user *rqtp, 612 struct compat_timespec __user *rmtp) 613 { 614 long err; 615 mm_segment_t oldfs; 616 struct timespec in, out; 617 618 if (get_compat_timespec(&in, rqtp)) 619 return -EFAULT; 620 621 oldfs = get_fs(); 622 set_fs(KERNEL_DS); 623 err = sys_clock_nanosleep(which_clock, flags, 624 (struct timespec __user *) &in, 625 (struct timespec __user *) &out); 626 set_fs(oldfs); 627 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 628 put_compat_timespec(&out, rmtp)) 629 return -EFAULT; 630 return err; 631 } 632 633 /* 634 * We currently only need the following fields from the sigevent 635 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 636 * sigev_notify_thread_id). The others are handled in user mode. 637 * We also assume that copying sigev_value.sival_int is sufficient 638 * to keep all the bits of sigev_value.sival_ptr intact. 639 */ 640 int get_compat_sigevent(struct sigevent *event, 641 const struct compat_sigevent __user *u_event) 642 { 643 memset(event, 0, sizeof(*event)); 644 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 645 __get_user(event->sigev_value.sival_int, 646 &u_event->sigev_value.sival_int) || 647 __get_user(event->sigev_signo, &u_event->sigev_signo) || 648 __get_user(event->sigev_notify, &u_event->sigev_notify) || 649 __get_user(event->sigev_notify_thread_id, 650 &u_event->sigev_notify_thread_id)) 651 ? -EFAULT : 0; 652 } 653 654 /* timer_create is architecture specific because it needs sigevent conversion */ 655 656 long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask, 657 unsigned long bitmap_size) 658 { 659 int i, j; 660 unsigned long m; 661 compat_ulong_t um; 662 unsigned long nr_compat_longs; 663 664 /* align bitmap up to nearest compat_long_t boundary */ 665 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 666 667 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 668 return -EFAULT; 669 670 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 671 672 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 673 m = 0; 674 675 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 676 /* 677 * We dont want to read past the end of the userspace 678 * bitmap. We must however ensure the end of the 679 * kernel bitmap is zeroed. 680 */ 681 if (nr_compat_longs-- > 0) { 682 if (__get_user(um, umask)) 683 return -EFAULT; 684 } else { 685 um = 0; 686 } 687 688 umask++; 689 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 690 } 691 *mask++ = m; 692 } 693 694 return 0; 695 } 696 697 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 698 unsigned long bitmap_size) 699 { 700 int i, j; 701 unsigned long m; 702 compat_ulong_t um; 703 unsigned long nr_compat_longs; 704 705 /* align bitmap up to nearest compat_long_t boundary */ 706 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 707 708 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 709 return -EFAULT; 710 711 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 712 713 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 714 m = *mask++; 715 716 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 717 um = m; 718 719 /* 720 * We dont want to write past the end of the userspace 721 * bitmap. 722 */ 723 if (nr_compat_longs-- > 0) { 724 if (__put_user(um, umask)) 725 return -EFAULT; 726 } 727 728 umask++; 729 m >>= 4*sizeof(um); 730 m >>= 4*sizeof(um); 731 } 732 } 733 734 return 0; 735 } 736 737 void 738 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 739 { 740 switch (_NSIG_WORDS) { 741 #if defined (__COMPAT_ENDIAN_SWAP__) 742 case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 ); 743 case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 ); 744 case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 ); 745 case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 ); 746 #else 747 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 748 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 749 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 750 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 751 #endif 752 } 753 } 754 755 asmlinkage long 756 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 757 struct compat_siginfo __user *uinfo, 758 struct compat_timespec __user *uts, compat_size_t sigsetsize) 759 { 760 compat_sigset_t s32; 761 sigset_t s; 762 int sig; 763 struct timespec t; 764 siginfo_t info; 765 long ret, timeout = 0; 766 767 if (sigsetsize != sizeof(sigset_t)) 768 return -EINVAL; 769 770 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 771 return -EFAULT; 772 sigset_from_compat(&s, &s32); 773 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); 774 signotset(&s); 775 776 if (uts) { 777 if (get_compat_timespec (&t, uts)) 778 return -EFAULT; 779 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 780 || t.tv_sec < 0) 781 return -EINVAL; 782 } 783 784 spin_lock_irq(¤t->sighand->siglock); 785 sig = dequeue_signal(current, &s, &info); 786 if (!sig) { 787 timeout = MAX_SCHEDULE_TIMEOUT; 788 if (uts) 789 timeout = timespec_to_jiffies(&t) 790 +(t.tv_sec || t.tv_nsec); 791 if (timeout) { 792 current->real_blocked = current->blocked; 793 sigandsets(¤t->blocked, ¤t->blocked, &s); 794 795 recalc_sigpending(); 796 spin_unlock_irq(¤t->sighand->siglock); 797 798 current->state = TASK_INTERRUPTIBLE; 799 timeout = schedule_timeout(timeout); 800 801 spin_lock_irq(¤t->sighand->siglock); 802 sig = dequeue_signal(current, &s, &info); 803 current->blocked = current->real_blocked; 804 siginitset(¤t->real_blocked, 0); 805 recalc_sigpending(); 806 } 807 } 808 spin_unlock_irq(¤t->sighand->siglock); 809 810 if (sig) { 811 ret = sig; 812 if (uinfo) { 813 if (copy_siginfo_to_user32(uinfo, &info)) 814 ret = -EFAULT; 815 } 816 }else { 817 ret = timeout?-EINTR:-EAGAIN; 818 } 819 return ret; 820 821 } 822 823 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 824 825 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 826 827 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 828 { 829 compat_time_t i; 830 struct timeval tv; 831 832 do_gettimeofday(&tv); 833 i = tv.tv_sec; 834 835 if (tloc) { 836 if (put_user(i,tloc)) 837 i = -EFAULT; 838 } 839 return i; 840 } 841 842 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 843 { 844 struct timespec tv; 845 int err; 846 847 if (get_user(tv.tv_sec, tptr)) 848 return -EFAULT; 849 850 tv.tv_nsec = 0; 851 852 err = security_settime(&tv, NULL); 853 if (err) 854 return err; 855 856 do_settimeofday(&tv); 857 return 0; 858 } 859 860 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 861