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 expire = schedule_timeout_interruptible(expire - now); 52 if (expire == 0) 53 return 0; 54 55 rmtp = (struct compat_timespec __user *)restart->arg1; 56 if (rmtp) { 57 struct compat_timespec ct; 58 struct timespec t; 59 60 jiffies_to_timespec(expire, &t); 61 ct.tv_sec = t.tv_sec; 62 ct.tv_nsec = t.tv_nsec; 63 if (copy_to_user(rmtp, &ct, sizeof(ct))) 64 return -EFAULT; 65 } 66 /* The 'restart' block is already filled in */ 67 return -ERESTART_RESTARTBLOCK; 68 } 69 70 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, 71 struct compat_timespec __user *rmtp) 72 { 73 struct timespec t; 74 struct restart_block *restart; 75 unsigned long expire; 76 77 if (get_compat_timespec(&t, rqtp)) 78 return -EFAULT; 79 80 if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0)) 81 return -EINVAL; 82 83 expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec); 84 expire = schedule_timeout_interruptible(expire); 85 if (expire == 0) 86 return 0; 87 88 if (rmtp) { 89 jiffies_to_timespec(expire, &t); 90 if (put_compat_timespec(&t, rmtp)) 91 return -EFAULT; 92 } 93 restart = ¤t_thread_info()->restart_block; 94 restart->fn = compat_nanosleep_restart; 95 restart->arg0 = jiffies + expire; 96 restart->arg1 = (unsigned long) rmtp; 97 return -ERESTART_RESTARTBLOCK; 98 } 99 100 static inline long get_compat_itimerval(struct itimerval *o, 101 struct compat_itimerval __user *i) 102 { 103 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 104 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 105 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 106 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 107 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 108 } 109 110 static inline long put_compat_itimerval(struct compat_itimerval __user *o, 111 struct itimerval *i) 112 { 113 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 114 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 115 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 116 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 117 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 118 } 119 120 asmlinkage long compat_sys_getitimer(int which, 121 struct compat_itimerval __user *it) 122 { 123 struct itimerval kit; 124 int error; 125 126 error = do_getitimer(which, &kit); 127 if (!error && put_compat_itimerval(it, &kit)) 128 error = -EFAULT; 129 return error; 130 } 131 132 asmlinkage long compat_sys_setitimer(int which, 133 struct compat_itimerval __user *in, 134 struct compat_itimerval __user *out) 135 { 136 struct itimerval kin, kout; 137 int error; 138 139 if (in) { 140 if (get_compat_itimerval(&kin, in)) 141 return -EFAULT; 142 } else 143 memset(&kin, 0, sizeof(kin)); 144 145 error = do_setitimer(which, &kin, out ? &kout : NULL); 146 if (error || !out) 147 return error; 148 if (put_compat_itimerval(out, &kout)) 149 return -EFAULT; 150 return 0; 151 } 152 153 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) 154 { 155 /* 156 * In the SMP world we might just be unlucky and have one of 157 * the times increment as we use it. Since the value is an 158 * atomically safe type this is just fine. Conceptually its 159 * as if the syscall took an instant longer to occur. 160 */ 161 if (tbuf) { 162 struct compat_tms tmp; 163 struct task_struct *tsk = current; 164 struct task_struct *t; 165 cputime_t utime, stime, cutime, cstime; 166 167 read_lock(&tasklist_lock); 168 utime = tsk->signal->utime; 169 stime = tsk->signal->stime; 170 t = tsk; 171 do { 172 utime = cputime_add(utime, t->utime); 173 stime = cputime_add(stime, t->stime); 174 t = next_thread(t); 175 } while (t != tsk); 176 177 /* 178 * While we have tasklist_lock read-locked, no dying thread 179 * can be updating current->signal->[us]time. Instead, 180 * we got their counts included in the live thread loop. 181 * However, another thread can come in right now and 182 * do a wait call that updates current->signal->c[us]time. 183 * To make sure we always see that pair updated atomically, 184 * we take the siglock around fetching them. 185 */ 186 spin_lock_irq(&tsk->sighand->siglock); 187 cutime = tsk->signal->cutime; 188 cstime = tsk->signal->cstime; 189 spin_unlock_irq(&tsk->sighand->siglock); 190 read_unlock(&tasklist_lock); 191 192 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime)); 193 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime)); 194 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime)); 195 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime)); 196 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 197 return -EFAULT; 198 } 199 return compat_jiffies_to_clock_t(jiffies); 200 } 201 202 /* 203 * Assumption: old_sigset_t and compat_old_sigset_t are both 204 * types that can be passed to put_user()/get_user(). 205 */ 206 207 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) 208 { 209 old_sigset_t s; 210 long ret; 211 mm_segment_t old_fs = get_fs(); 212 213 set_fs(KERNEL_DS); 214 ret = sys_sigpending((old_sigset_t __user *) &s); 215 set_fs(old_fs); 216 if (ret == 0) 217 ret = put_user(s, set); 218 return ret; 219 } 220 221 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set, 222 compat_old_sigset_t __user *oset) 223 { 224 old_sigset_t s; 225 long ret; 226 mm_segment_t old_fs; 227 228 if (set && get_user(s, set)) 229 return -EFAULT; 230 old_fs = get_fs(); 231 set_fs(KERNEL_DS); 232 ret = sys_sigprocmask(how, 233 set ? (old_sigset_t __user *) &s : NULL, 234 oset ? (old_sigset_t __user *) &s : NULL); 235 set_fs(old_fs); 236 if (ret == 0) 237 if (oset) 238 ret = put_user(s, oset); 239 return ret; 240 } 241 242 #ifdef CONFIG_FUTEX 243 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, int val, 244 struct compat_timespec __user *utime, u32 __user *uaddr2, 245 int val3) 246 { 247 struct timespec t; 248 unsigned long timeout = MAX_SCHEDULE_TIMEOUT; 249 int val2 = 0; 250 251 if ((op == FUTEX_WAIT) && utime) { 252 if (get_compat_timespec(&t, utime)) 253 return -EFAULT; 254 timeout = timespec_to_jiffies(&t) + 1; 255 } 256 if (op >= FUTEX_REQUEUE) 257 val2 = (int) (unsigned long) utime; 258 259 return do_futex((unsigned long)uaddr, op, val, timeout, 260 (unsigned long)uaddr2, val2, val3); 261 } 262 #endif 263 264 asmlinkage long compat_sys_setrlimit(unsigned int resource, 265 struct compat_rlimit __user *rlim) 266 { 267 struct rlimit r; 268 int ret; 269 mm_segment_t old_fs = get_fs (); 270 271 if (resource >= RLIM_NLIMITS) 272 return -EINVAL; 273 274 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 275 __get_user(r.rlim_cur, &rlim->rlim_cur) || 276 __get_user(r.rlim_max, &rlim->rlim_max)) 277 return -EFAULT; 278 279 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 280 r.rlim_cur = RLIM_INFINITY; 281 if (r.rlim_max == COMPAT_RLIM_INFINITY) 282 r.rlim_max = RLIM_INFINITY; 283 set_fs(KERNEL_DS); 284 ret = sys_setrlimit(resource, (struct rlimit __user *) &r); 285 set_fs(old_fs); 286 return ret; 287 } 288 289 #ifdef COMPAT_RLIM_OLD_INFINITY 290 291 asmlinkage long compat_sys_old_getrlimit(unsigned int resource, 292 struct compat_rlimit __user *rlim) 293 { 294 struct rlimit r; 295 int ret; 296 mm_segment_t old_fs = get_fs(); 297 298 set_fs(KERNEL_DS); 299 ret = sys_old_getrlimit(resource, &r); 300 set_fs(old_fs); 301 302 if (!ret) { 303 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 304 r.rlim_cur = COMPAT_RLIM_INFINITY; 305 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 306 r.rlim_max = COMPAT_RLIM_INFINITY; 307 308 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 309 __put_user(r.rlim_cur, &rlim->rlim_cur) || 310 __put_user(r.rlim_max, &rlim->rlim_max)) 311 return -EFAULT; 312 } 313 return ret; 314 } 315 316 #endif 317 318 asmlinkage long compat_sys_getrlimit (unsigned int resource, 319 struct compat_rlimit __user *rlim) 320 { 321 struct rlimit r; 322 int ret; 323 mm_segment_t old_fs = get_fs(); 324 325 set_fs(KERNEL_DS); 326 ret = sys_getrlimit(resource, (struct rlimit __user *) &r); 327 set_fs(old_fs); 328 if (!ret) { 329 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 330 r.rlim_cur = COMPAT_RLIM_INFINITY; 331 if (r.rlim_max > COMPAT_RLIM_INFINITY) 332 r.rlim_max = COMPAT_RLIM_INFINITY; 333 334 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 335 __put_user(r.rlim_cur, &rlim->rlim_cur) || 336 __put_user(r.rlim_max, &rlim->rlim_max)) 337 return -EFAULT; 338 } 339 return ret; 340 } 341 342 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 343 { 344 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 345 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 346 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 347 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 348 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 349 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 350 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 351 __put_user(r->ru_idrss, &ru->ru_idrss) || 352 __put_user(r->ru_isrss, &ru->ru_isrss) || 353 __put_user(r->ru_minflt, &ru->ru_minflt) || 354 __put_user(r->ru_majflt, &ru->ru_majflt) || 355 __put_user(r->ru_nswap, &ru->ru_nswap) || 356 __put_user(r->ru_inblock, &ru->ru_inblock) || 357 __put_user(r->ru_oublock, &ru->ru_oublock) || 358 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 359 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 360 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 361 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 362 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 363 return -EFAULT; 364 return 0; 365 } 366 367 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) 368 { 369 struct rusage r; 370 int ret; 371 mm_segment_t old_fs = get_fs(); 372 373 set_fs(KERNEL_DS); 374 ret = sys_getrusage(who, (struct rusage __user *) &r); 375 set_fs(old_fs); 376 377 if (ret) 378 return ret; 379 380 if (put_compat_rusage(&r, ru)) 381 return -EFAULT; 382 383 return 0; 384 } 385 386 asmlinkage long 387 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, 388 struct compat_rusage __user *ru) 389 { 390 if (!ru) { 391 return sys_wait4(pid, stat_addr, options, NULL); 392 } else { 393 struct rusage r; 394 int ret; 395 unsigned int status; 396 mm_segment_t old_fs = get_fs(); 397 398 set_fs (KERNEL_DS); 399 ret = sys_wait4(pid, 400 (stat_addr ? 401 (unsigned int __user *) &status : NULL), 402 options, (struct rusage __user *) &r); 403 set_fs (old_fs); 404 405 if (ret > 0) { 406 if (put_compat_rusage(&r, ru)) 407 return -EFAULT; 408 if (stat_addr && put_user(status, stat_addr)) 409 return -EFAULT; 410 } 411 return ret; 412 } 413 } 414 415 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, 416 struct compat_siginfo __user *uinfo, int options, 417 struct compat_rusage __user *uru) 418 { 419 siginfo_t info; 420 struct rusage ru; 421 long ret; 422 mm_segment_t old_fs = get_fs(); 423 424 memset(&info, 0, sizeof(info)); 425 426 set_fs(KERNEL_DS); 427 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 428 uru ? (struct rusage __user *)&ru : NULL); 429 set_fs(old_fs); 430 431 if ((ret < 0) || (info.si_signo == 0)) 432 return ret; 433 434 if (uru) { 435 ret = put_compat_rusage(&ru, uru); 436 if (ret) 437 return ret; 438 } 439 440 BUG_ON(info.si_code & __SI_MASK); 441 info.si_code |= __SI_CHLD; 442 return copy_siginfo_to_user32(uinfo, &info); 443 } 444 445 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 446 unsigned len, cpumask_t *new_mask) 447 { 448 unsigned long *k; 449 450 if (len < sizeof(cpumask_t)) 451 memset(new_mask, 0, sizeof(cpumask_t)); 452 else if (len > sizeof(cpumask_t)) 453 len = sizeof(cpumask_t); 454 455 k = cpus_addr(*new_mask); 456 return compat_get_bitmap(k, user_mask_ptr, len * 8); 457 } 458 459 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 460 unsigned int len, 461 compat_ulong_t __user *user_mask_ptr) 462 { 463 cpumask_t new_mask; 464 int retval; 465 466 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask); 467 if (retval) 468 return retval; 469 470 return sched_setaffinity(pid, new_mask); 471 } 472 473 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 474 compat_ulong_t __user *user_mask_ptr) 475 { 476 int ret; 477 cpumask_t mask; 478 unsigned long *k; 479 unsigned int min_length = sizeof(cpumask_t); 480 481 if (NR_CPUS <= BITS_PER_COMPAT_LONG) 482 min_length = sizeof(compat_ulong_t); 483 484 if (len < min_length) 485 return -EINVAL; 486 487 ret = sched_getaffinity(pid, &mask); 488 if (ret < 0) 489 return ret; 490 491 k = cpus_addr(mask); 492 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); 493 if (ret) 494 return ret; 495 496 return min_length; 497 } 498 499 static int get_compat_itimerspec(struct itimerspec *dst, 500 struct compat_itimerspec __user *src) 501 { 502 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 503 get_compat_timespec(&dst->it_value, &src->it_value)) 504 return -EFAULT; 505 return 0; 506 } 507 508 static int put_compat_itimerspec(struct compat_itimerspec __user *dst, 509 struct itimerspec *src) 510 { 511 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 512 put_compat_timespec(&src->it_value, &dst->it_value)) 513 return -EFAULT; 514 return 0; 515 } 516 517 long compat_sys_timer_create(clockid_t which_clock, 518 struct compat_sigevent __user *timer_event_spec, 519 timer_t __user *created_timer_id) 520 { 521 struct sigevent __user *event = NULL; 522 523 if (timer_event_spec) { 524 struct sigevent kevent; 525 526 event = compat_alloc_user_space(sizeof(*event)); 527 if (get_compat_sigevent(&kevent, timer_event_spec) || 528 copy_to_user(event, &kevent, sizeof(*event))) 529 return -EFAULT; 530 } 531 532 return sys_timer_create(which_clock, event, created_timer_id); 533 } 534 535 long compat_sys_timer_settime(timer_t timer_id, int flags, 536 struct compat_itimerspec __user *new, 537 struct compat_itimerspec __user *old) 538 { 539 long err; 540 mm_segment_t oldfs; 541 struct itimerspec newts, oldts; 542 543 if (!new) 544 return -EINVAL; 545 if (get_compat_itimerspec(&newts, new)) 546 return -EFAULT; 547 oldfs = get_fs(); 548 set_fs(KERNEL_DS); 549 err = sys_timer_settime(timer_id, flags, 550 (struct itimerspec __user *) &newts, 551 (struct itimerspec __user *) &oldts); 552 set_fs(oldfs); 553 if (!err && old && put_compat_itimerspec(old, &oldts)) 554 return -EFAULT; 555 return err; 556 } 557 558 long compat_sys_timer_gettime(timer_t timer_id, 559 struct compat_itimerspec __user *setting) 560 { 561 long err; 562 mm_segment_t oldfs; 563 struct itimerspec ts; 564 565 oldfs = get_fs(); 566 set_fs(KERNEL_DS); 567 err = sys_timer_gettime(timer_id, 568 (struct itimerspec __user *) &ts); 569 set_fs(oldfs); 570 if (!err && put_compat_itimerspec(setting, &ts)) 571 return -EFAULT; 572 return err; 573 } 574 575 long compat_sys_clock_settime(clockid_t which_clock, 576 struct compat_timespec __user *tp) 577 { 578 long err; 579 mm_segment_t oldfs; 580 struct timespec ts; 581 582 if (get_compat_timespec(&ts, tp)) 583 return -EFAULT; 584 oldfs = get_fs(); 585 set_fs(KERNEL_DS); 586 err = sys_clock_settime(which_clock, 587 (struct timespec __user *) &ts); 588 set_fs(oldfs); 589 return err; 590 } 591 592 long compat_sys_clock_gettime(clockid_t which_clock, 593 struct compat_timespec __user *tp) 594 { 595 long err; 596 mm_segment_t oldfs; 597 struct timespec ts; 598 599 oldfs = get_fs(); 600 set_fs(KERNEL_DS); 601 err = sys_clock_gettime(which_clock, 602 (struct timespec __user *) &ts); 603 set_fs(oldfs); 604 if (!err && put_compat_timespec(&ts, tp)) 605 return -EFAULT; 606 return err; 607 } 608 609 long compat_sys_clock_getres(clockid_t which_clock, 610 struct compat_timespec __user *tp) 611 { 612 long err; 613 mm_segment_t oldfs; 614 struct timespec ts; 615 616 oldfs = get_fs(); 617 set_fs(KERNEL_DS); 618 err = sys_clock_getres(which_clock, 619 (struct timespec __user *) &ts); 620 set_fs(oldfs); 621 if (!err && tp && put_compat_timespec(&ts, tp)) 622 return -EFAULT; 623 return err; 624 } 625 626 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 627 struct compat_timespec __user *rqtp, 628 struct compat_timespec __user *rmtp) 629 { 630 long err; 631 mm_segment_t oldfs; 632 struct timespec in, out; 633 634 if (get_compat_timespec(&in, rqtp)) 635 return -EFAULT; 636 637 oldfs = get_fs(); 638 set_fs(KERNEL_DS); 639 err = sys_clock_nanosleep(which_clock, flags, 640 (struct timespec __user *) &in, 641 (struct timespec __user *) &out); 642 set_fs(oldfs); 643 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 644 put_compat_timespec(&out, rmtp)) 645 return -EFAULT; 646 return err; 647 } 648 649 /* 650 * We currently only need the following fields from the sigevent 651 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 652 * sigev_notify_thread_id). The others are handled in user mode. 653 * We also assume that copying sigev_value.sival_int is sufficient 654 * to keep all the bits of sigev_value.sival_ptr intact. 655 */ 656 int get_compat_sigevent(struct sigevent *event, 657 const struct compat_sigevent __user *u_event) 658 { 659 memset(event, 0, sizeof(*event)); 660 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 661 __get_user(event->sigev_value.sival_int, 662 &u_event->sigev_value.sival_int) || 663 __get_user(event->sigev_signo, &u_event->sigev_signo) || 664 __get_user(event->sigev_notify, &u_event->sigev_notify) || 665 __get_user(event->sigev_notify_thread_id, 666 &u_event->sigev_notify_thread_id)) 667 ? -EFAULT : 0; 668 } 669 670 long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask, 671 unsigned long bitmap_size) 672 { 673 int i, j; 674 unsigned long m; 675 compat_ulong_t um; 676 unsigned long nr_compat_longs; 677 678 /* align bitmap up to nearest compat_long_t boundary */ 679 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 680 681 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 682 return -EFAULT; 683 684 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 685 686 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 687 m = 0; 688 689 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 690 /* 691 * We dont want to read past the end of the userspace 692 * bitmap. We must however ensure the end of the 693 * kernel bitmap is zeroed. 694 */ 695 if (nr_compat_longs-- > 0) { 696 if (__get_user(um, umask)) 697 return -EFAULT; 698 } else { 699 um = 0; 700 } 701 702 umask++; 703 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 704 } 705 *mask++ = m; 706 } 707 708 return 0; 709 } 710 711 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 712 unsigned long bitmap_size) 713 { 714 int i, j; 715 unsigned long m; 716 compat_ulong_t um; 717 unsigned long nr_compat_longs; 718 719 /* align bitmap up to nearest compat_long_t boundary */ 720 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 721 722 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 723 return -EFAULT; 724 725 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 726 727 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 728 m = *mask++; 729 730 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 731 um = m; 732 733 /* 734 * We dont want to write past the end of the userspace 735 * bitmap. 736 */ 737 if (nr_compat_longs-- > 0) { 738 if (__put_user(um, umask)) 739 return -EFAULT; 740 } 741 742 umask++; 743 m >>= 4*sizeof(um); 744 m >>= 4*sizeof(um); 745 } 746 } 747 748 return 0; 749 } 750 751 void 752 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 753 { 754 switch (_NSIG_WORDS) { 755 #if defined (__COMPAT_ENDIAN_SWAP__) 756 case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 ); 757 case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 ); 758 case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 ); 759 case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 ); 760 #else 761 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 762 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 763 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 764 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 765 #endif 766 } 767 } 768 769 asmlinkage long 770 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 771 struct compat_siginfo __user *uinfo, 772 struct compat_timespec __user *uts, compat_size_t sigsetsize) 773 { 774 compat_sigset_t s32; 775 sigset_t s; 776 int sig; 777 struct timespec t; 778 siginfo_t info; 779 long ret, timeout = 0; 780 781 if (sigsetsize != sizeof(sigset_t)) 782 return -EINVAL; 783 784 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 785 return -EFAULT; 786 sigset_from_compat(&s, &s32); 787 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); 788 signotset(&s); 789 790 if (uts) { 791 if (get_compat_timespec (&t, uts)) 792 return -EFAULT; 793 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 794 || t.tv_sec < 0) 795 return -EINVAL; 796 } 797 798 spin_lock_irq(¤t->sighand->siglock); 799 sig = dequeue_signal(current, &s, &info); 800 if (!sig) { 801 timeout = MAX_SCHEDULE_TIMEOUT; 802 if (uts) 803 timeout = timespec_to_jiffies(&t) 804 +(t.tv_sec || t.tv_nsec); 805 if (timeout) { 806 current->real_blocked = current->blocked; 807 sigandsets(¤t->blocked, ¤t->blocked, &s); 808 809 recalc_sigpending(); 810 spin_unlock_irq(¤t->sighand->siglock); 811 812 timeout = schedule_timeout_interruptible(timeout); 813 814 spin_lock_irq(¤t->sighand->siglock); 815 sig = dequeue_signal(current, &s, &info); 816 current->blocked = current->real_blocked; 817 siginitset(¤t->real_blocked, 0); 818 recalc_sigpending(); 819 } 820 } 821 spin_unlock_irq(¤t->sighand->siglock); 822 823 if (sig) { 824 ret = sig; 825 if (uinfo) { 826 if (copy_siginfo_to_user32(uinfo, &info)) 827 ret = -EFAULT; 828 } 829 }else { 830 ret = timeout?-EINTR:-EAGAIN; 831 } 832 return ret; 833 834 } 835 836 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 837 838 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 839 840 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 841 { 842 compat_time_t i; 843 struct timeval tv; 844 845 do_gettimeofday(&tv); 846 i = tv.tv_sec; 847 848 if (tloc) { 849 if (put_user(i,tloc)) 850 i = -EFAULT; 851 } 852 return i; 853 } 854 855 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 856 { 857 struct timespec tv; 858 int err; 859 860 if (get_user(tv.tv_sec, tptr)) 861 return -EFAULT; 862 863 tv.tv_nsec = 0; 864 865 err = security_settime(&tv, NULL); 866 if (err) 867 return err; 868 869 do_settimeofday(&tv); 870 return 0; 871 } 872 873 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 874