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_settime(timer_t timer_id, int flags, 518 struct compat_itimerspec __user *new, 519 struct compat_itimerspec __user *old) 520 { 521 long err; 522 mm_segment_t oldfs; 523 struct itimerspec newts, oldts; 524 525 if (!new) 526 return -EINVAL; 527 if (get_compat_itimerspec(&newts, new)) 528 return -EFAULT; 529 oldfs = get_fs(); 530 set_fs(KERNEL_DS); 531 err = sys_timer_settime(timer_id, flags, 532 (struct itimerspec __user *) &newts, 533 (struct itimerspec __user *) &oldts); 534 set_fs(oldfs); 535 if (!err && old && put_compat_itimerspec(old, &oldts)) 536 return -EFAULT; 537 return err; 538 } 539 540 long compat_sys_timer_gettime(timer_t timer_id, 541 struct compat_itimerspec __user *setting) 542 { 543 long err; 544 mm_segment_t oldfs; 545 struct itimerspec ts; 546 547 oldfs = get_fs(); 548 set_fs(KERNEL_DS); 549 err = sys_timer_gettime(timer_id, 550 (struct itimerspec __user *) &ts); 551 set_fs(oldfs); 552 if (!err && put_compat_itimerspec(setting, &ts)) 553 return -EFAULT; 554 return err; 555 } 556 557 long compat_sys_clock_settime(clockid_t which_clock, 558 struct compat_timespec __user *tp) 559 { 560 long err; 561 mm_segment_t oldfs; 562 struct timespec ts; 563 564 if (get_compat_timespec(&ts, tp)) 565 return -EFAULT; 566 oldfs = get_fs(); 567 set_fs(KERNEL_DS); 568 err = sys_clock_settime(which_clock, 569 (struct timespec __user *) &ts); 570 set_fs(oldfs); 571 return err; 572 } 573 574 long compat_sys_clock_gettime(clockid_t which_clock, 575 struct compat_timespec __user *tp) 576 { 577 long err; 578 mm_segment_t oldfs; 579 struct timespec ts; 580 581 oldfs = get_fs(); 582 set_fs(KERNEL_DS); 583 err = sys_clock_gettime(which_clock, 584 (struct timespec __user *) &ts); 585 set_fs(oldfs); 586 if (!err && put_compat_timespec(&ts, tp)) 587 return -EFAULT; 588 return err; 589 } 590 591 long compat_sys_clock_getres(clockid_t which_clock, 592 struct compat_timespec __user *tp) 593 { 594 long err; 595 mm_segment_t oldfs; 596 struct timespec ts; 597 598 oldfs = get_fs(); 599 set_fs(KERNEL_DS); 600 err = sys_clock_getres(which_clock, 601 (struct timespec __user *) &ts); 602 set_fs(oldfs); 603 if (!err && tp && put_compat_timespec(&ts, tp)) 604 return -EFAULT; 605 return err; 606 } 607 608 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 609 struct compat_timespec __user *rqtp, 610 struct compat_timespec __user *rmtp) 611 { 612 long err; 613 mm_segment_t oldfs; 614 struct timespec in, out; 615 616 if (get_compat_timespec(&in, rqtp)) 617 return -EFAULT; 618 619 oldfs = get_fs(); 620 set_fs(KERNEL_DS); 621 err = sys_clock_nanosleep(which_clock, flags, 622 (struct timespec __user *) &in, 623 (struct timespec __user *) &out); 624 set_fs(oldfs); 625 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 626 put_compat_timespec(&out, rmtp)) 627 return -EFAULT; 628 return err; 629 } 630 631 /* 632 * We currently only need the following fields from the sigevent 633 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 634 * sigev_notify_thread_id). The others are handled in user mode. 635 * We also assume that copying sigev_value.sival_int is sufficient 636 * to keep all the bits of sigev_value.sival_ptr intact. 637 */ 638 int get_compat_sigevent(struct sigevent *event, 639 const struct compat_sigevent __user *u_event) 640 { 641 memset(event, 0, sizeof(*event)); 642 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 643 __get_user(event->sigev_value.sival_int, 644 &u_event->sigev_value.sival_int) || 645 __get_user(event->sigev_signo, &u_event->sigev_signo) || 646 __get_user(event->sigev_notify, &u_event->sigev_notify) || 647 __get_user(event->sigev_notify_thread_id, 648 &u_event->sigev_notify_thread_id)) 649 ? -EFAULT : 0; 650 } 651 652 /* timer_create is architecture specific because it needs sigevent conversion */ 653 654 long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask, 655 unsigned long bitmap_size) 656 { 657 int i, j; 658 unsigned long m; 659 compat_ulong_t um; 660 unsigned long nr_compat_longs; 661 662 /* align bitmap up to nearest compat_long_t boundary */ 663 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 664 665 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 666 return -EFAULT; 667 668 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 669 670 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 671 m = 0; 672 673 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 674 /* 675 * We dont want to read past the end of the userspace 676 * bitmap. We must however ensure the end of the 677 * kernel bitmap is zeroed. 678 */ 679 if (nr_compat_longs-- > 0) { 680 if (__get_user(um, umask)) 681 return -EFAULT; 682 } else { 683 um = 0; 684 } 685 686 umask++; 687 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 688 } 689 *mask++ = m; 690 } 691 692 return 0; 693 } 694 695 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 696 unsigned long bitmap_size) 697 { 698 int i, j; 699 unsigned long m; 700 compat_ulong_t um; 701 unsigned long nr_compat_longs; 702 703 /* align bitmap up to nearest compat_long_t boundary */ 704 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 705 706 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 707 return -EFAULT; 708 709 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 710 711 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 712 m = *mask++; 713 714 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 715 um = m; 716 717 /* 718 * We dont want to write past the end of the userspace 719 * bitmap. 720 */ 721 if (nr_compat_longs-- > 0) { 722 if (__put_user(um, umask)) 723 return -EFAULT; 724 } 725 726 umask++; 727 m >>= 4*sizeof(um); 728 m >>= 4*sizeof(um); 729 } 730 } 731 732 return 0; 733 } 734 735 void 736 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 737 { 738 switch (_NSIG_WORDS) { 739 #if defined (__COMPAT_ENDIAN_SWAP__) 740 case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 ); 741 case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 ); 742 case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 ); 743 case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 ); 744 #else 745 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 746 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 747 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 748 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 749 #endif 750 } 751 } 752 753 asmlinkage long 754 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 755 struct compat_siginfo __user *uinfo, 756 struct compat_timespec __user *uts, compat_size_t sigsetsize) 757 { 758 compat_sigset_t s32; 759 sigset_t s; 760 int sig; 761 struct timespec t; 762 siginfo_t info; 763 long ret, timeout = 0; 764 765 if (sigsetsize != sizeof(sigset_t)) 766 return -EINVAL; 767 768 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 769 return -EFAULT; 770 sigset_from_compat(&s, &s32); 771 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); 772 signotset(&s); 773 774 if (uts) { 775 if (get_compat_timespec (&t, uts)) 776 return -EFAULT; 777 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 778 || t.tv_sec < 0) 779 return -EINVAL; 780 } 781 782 spin_lock_irq(¤t->sighand->siglock); 783 sig = dequeue_signal(current, &s, &info); 784 if (!sig) { 785 timeout = MAX_SCHEDULE_TIMEOUT; 786 if (uts) 787 timeout = timespec_to_jiffies(&t) 788 +(t.tv_sec || t.tv_nsec); 789 if (timeout) { 790 current->real_blocked = current->blocked; 791 sigandsets(¤t->blocked, ¤t->blocked, &s); 792 793 recalc_sigpending(); 794 spin_unlock_irq(¤t->sighand->siglock); 795 796 timeout = schedule_timeout_interruptible(timeout); 797 798 spin_lock_irq(¤t->sighand->siglock); 799 sig = dequeue_signal(current, &s, &info); 800 current->blocked = current->real_blocked; 801 siginitset(¤t->real_blocked, 0); 802 recalc_sigpending(); 803 } 804 } 805 spin_unlock_irq(¤t->sighand->siglock); 806 807 if (sig) { 808 ret = sig; 809 if (uinfo) { 810 if (copy_siginfo_to_user32(uinfo, &info)) 811 ret = -EFAULT; 812 } 813 }else { 814 ret = timeout?-EINTR:-EAGAIN; 815 } 816 return ret; 817 818 } 819 820 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 821 822 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 823 824 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 825 { 826 compat_time_t i; 827 struct timeval tv; 828 829 do_gettimeofday(&tv); 830 i = tv.tv_sec; 831 832 if (tloc) { 833 if (put_user(i,tloc)) 834 i = -EFAULT; 835 } 836 return i; 837 } 838 839 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 840 { 841 struct timespec tv; 842 int err; 843 844 if (get_user(tv.tv_sec, tptr)) 845 return -EFAULT; 846 847 tv.tv_nsec = 0; 848 849 err = security_settime(&tv, NULL); 850 if (err) 851 return err; 852 853 do_settimeofday(&tv); 854 return 0; 855 } 856 857 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 858