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 27 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts) 28 { 29 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || 30 __get_user(ts->tv_sec, &cts->tv_sec) || 31 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 32 } 33 34 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts) 35 { 36 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || 37 __put_user(ts->tv_sec, &cts->tv_sec) || 38 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 39 } 40 41 static long compat_nanosleep_restart(struct restart_block *restart) 42 { 43 unsigned long expire = restart->arg0, now = jiffies; 44 struct compat_timespec __user *rmtp; 45 46 /* Did it expire while we handled signals? */ 47 if (!time_after(expire, now)) 48 return 0; 49 50 expire = schedule_timeout_interruptible(expire - now); 51 if (expire == 0) 52 return 0; 53 54 rmtp = (struct compat_timespec __user *)restart->arg1; 55 if (rmtp) { 56 struct compat_timespec ct; 57 struct timespec t; 58 59 jiffies_to_timespec(expire, &t); 60 ct.tv_sec = t.tv_sec; 61 ct.tv_nsec = t.tv_nsec; 62 if (copy_to_user(rmtp, &ct, sizeof(ct))) 63 return -EFAULT; 64 } 65 /* The 'restart' block is already filled in */ 66 return -ERESTART_RESTARTBLOCK; 67 } 68 69 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, 70 struct compat_timespec __user *rmtp) 71 { 72 struct timespec t; 73 struct restart_block *restart; 74 unsigned long expire; 75 76 if (get_compat_timespec(&t, rqtp)) 77 return -EFAULT; 78 79 if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0)) 80 return -EINVAL; 81 82 expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec); 83 expire = schedule_timeout_interruptible(expire); 84 if (expire == 0) 85 return 0; 86 87 if (rmtp) { 88 jiffies_to_timespec(expire, &t); 89 if (put_compat_timespec(&t, rmtp)) 90 return -EFAULT; 91 } 92 restart = ¤t_thread_info()->restart_block; 93 restart->fn = compat_nanosleep_restart; 94 restart->arg0 = jiffies + expire; 95 restart->arg1 = (unsigned long) rmtp; 96 return -ERESTART_RESTARTBLOCK; 97 } 98 99 static inline long get_compat_itimerval(struct itimerval *o, 100 struct compat_itimerval __user *i) 101 { 102 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 103 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 104 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 105 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 106 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 107 } 108 109 static inline long put_compat_itimerval(struct compat_itimerval __user *o, 110 struct itimerval *i) 111 { 112 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 113 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 114 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 115 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 116 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 117 } 118 119 asmlinkage long compat_sys_getitimer(int which, 120 struct compat_itimerval __user *it) 121 { 122 struct itimerval kit; 123 int error; 124 125 error = do_getitimer(which, &kit); 126 if (!error && put_compat_itimerval(it, &kit)) 127 error = -EFAULT; 128 return error; 129 } 130 131 asmlinkage long compat_sys_setitimer(int which, 132 struct compat_itimerval __user *in, 133 struct compat_itimerval __user *out) 134 { 135 struct itimerval kin, kout; 136 int error; 137 138 if (in) { 139 if (get_compat_itimerval(&kin, in)) 140 return -EFAULT; 141 } else 142 memset(&kin, 0, sizeof(kin)); 143 144 error = do_setitimer(which, &kin, out ? &kout : NULL); 145 if (error || !out) 146 return error; 147 if (put_compat_itimerval(out, &kout)) 148 return -EFAULT; 149 return 0; 150 } 151 152 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) 153 { 154 /* 155 * In the SMP world we might just be unlucky and have one of 156 * the times increment as we use it. Since the value is an 157 * atomically safe type this is just fine. Conceptually its 158 * as if the syscall took an instant longer to occur. 159 */ 160 if (tbuf) { 161 struct compat_tms tmp; 162 struct task_struct *tsk = current; 163 struct task_struct *t; 164 cputime_t utime, stime, cutime, cstime; 165 166 read_lock(&tasklist_lock); 167 utime = tsk->signal->utime; 168 stime = tsk->signal->stime; 169 t = tsk; 170 do { 171 utime = cputime_add(utime, t->utime); 172 stime = cputime_add(stime, t->stime); 173 t = next_thread(t); 174 } while (t != tsk); 175 176 /* 177 * While we have tasklist_lock read-locked, no dying thread 178 * can be updating current->signal->[us]time. Instead, 179 * we got their counts included in the live thread loop. 180 * However, another thread can come in right now and 181 * do a wait call that updates current->signal->c[us]time. 182 * To make sure we always see that pair updated atomically, 183 * we take the siglock around fetching them. 184 */ 185 spin_lock_irq(&tsk->sighand->siglock); 186 cutime = tsk->signal->cutime; 187 cstime = tsk->signal->cstime; 188 spin_unlock_irq(&tsk->sighand->siglock); 189 read_unlock(&tasklist_lock); 190 191 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime)); 192 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime)); 193 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime)); 194 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime)); 195 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 196 return -EFAULT; 197 } 198 return compat_jiffies_to_clock_t(jiffies); 199 } 200 201 /* 202 * Assumption: old_sigset_t and compat_old_sigset_t are both 203 * types that can be passed to put_user()/get_user(). 204 */ 205 206 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) 207 { 208 old_sigset_t s; 209 long ret; 210 mm_segment_t old_fs = get_fs(); 211 212 set_fs(KERNEL_DS); 213 ret = sys_sigpending((old_sigset_t __user *) &s); 214 set_fs(old_fs); 215 if (ret == 0) 216 ret = put_user(s, set); 217 return ret; 218 } 219 220 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set, 221 compat_old_sigset_t __user *oset) 222 { 223 old_sigset_t s; 224 long ret; 225 mm_segment_t old_fs; 226 227 if (set && get_user(s, set)) 228 return -EFAULT; 229 old_fs = get_fs(); 230 set_fs(KERNEL_DS); 231 ret = sys_sigprocmask(how, 232 set ? (old_sigset_t __user *) &s : NULL, 233 oset ? (old_sigset_t __user *) &s : NULL); 234 set_fs(old_fs); 235 if (ret == 0) 236 if (oset) 237 ret = put_user(s, oset); 238 return ret; 239 } 240 241 #ifdef CONFIG_FUTEX 242 asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, int val, 243 struct compat_timespec __user *utime, u32 __user *uaddr2, 244 int val3) 245 { 246 struct timespec t; 247 unsigned long timeout = MAX_SCHEDULE_TIMEOUT; 248 int val2 = 0; 249 250 if ((op == FUTEX_WAIT) && utime) { 251 if (get_compat_timespec(&t, utime)) 252 return -EFAULT; 253 timeout = timespec_to_jiffies(&t) + 1; 254 } 255 if (op >= FUTEX_REQUEUE) 256 val2 = (int) (unsigned long) utime; 257 258 return do_futex((unsigned long)uaddr, op, val, timeout, 259 (unsigned long)uaddr2, val2, val3); 260 } 261 #endif 262 263 asmlinkage long compat_sys_setrlimit(unsigned int resource, 264 struct compat_rlimit __user *rlim) 265 { 266 struct rlimit r; 267 int ret; 268 mm_segment_t old_fs = get_fs (); 269 270 if (resource >= RLIM_NLIMITS) 271 return -EINVAL; 272 273 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 274 __get_user(r.rlim_cur, &rlim->rlim_cur) || 275 __get_user(r.rlim_max, &rlim->rlim_max)) 276 return -EFAULT; 277 278 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 279 r.rlim_cur = RLIM_INFINITY; 280 if (r.rlim_max == COMPAT_RLIM_INFINITY) 281 r.rlim_max = RLIM_INFINITY; 282 set_fs(KERNEL_DS); 283 ret = sys_setrlimit(resource, (struct rlimit __user *) &r); 284 set_fs(old_fs); 285 return ret; 286 } 287 288 #ifdef COMPAT_RLIM_OLD_INFINITY 289 290 asmlinkage long compat_sys_old_getrlimit(unsigned int resource, 291 struct compat_rlimit __user *rlim) 292 { 293 struct rlimit r; 294 int ret; 295 mm_segment_t old_fs = get_fs(); 296 297 set_fs(KERNEL_DS); 298 ret = sys_old_getrlimit(resource, &r); 299 set_fs(old_fs); 300 301 if (!ret) { 302 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 303 r.rlim_cur = COMPAT_RLIM_INFINITY; 304 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 305 r.rlim_max = COMPAT_RLIM_INFINITY; 306 307 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 308 __put_user(r.rlim_cur, &rlim->rlim_cur) || 309 __put_user(r.rlim_max, &rlim->rlim_max)) 310 return -EFAULT; 311 } 312 return ret; 313 } 314 315 #endif 316 317 asmlinkage long compat_sys_getrlimit (unsigned int resource, 318 struct compat_rlimit __user *rlim) 319 { 320 struct rlimit r; 321 int ret; 322 mm_segment_t old_fs = get_fs(); 323 324 set_fs(KERNEL_DS); 325 ret = sys_getrlimit(resource, (struct rlimit __user *) &r); 326 set_fs(old_fs); 327 if (!ret) { 328 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 329 r.rlim_cur = COMPAT_RLIM_INFINITY; 330 if (r.rlim_max > COMPAT_RLIM_INFINITY) 331 r.rlim_max = COMPAT_RLIM_INFINITY; 332 333 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 334 __put_user(r.rlim_cur, &rlim->rlim_cur) || 335 __put_user(r.rlim_max, &rlim->rlim_max)) 336 return -EFAULT; 337 } 338 return ret; 339 } 340 341 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 342 { 343 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 344 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 345 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 346 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 347 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 348 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 349 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 350 __put_user(r->ru_idrss, &ru->ru_idrss) || 351 __put_user(r->ru_isrss, &ru->ru_isrss) || 352 __put_user(r->ru_minflt, &ru->ru_minflt) || 353 __put_user(r->ru_majflt, &ru->ru_majflt) || 354 __put_user(r->ru_nswap, &ru->ru_nswap) || 355 __put_user(r->ru_inblock, &ru->ru_inblock) || 356 __put_user(r->ru_oublock, &ru->ru_oublock) || 357 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 358 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 359 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 360 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 361 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 362 return -EFAULT; 363 return 0; 364 } 365 366 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) 367 { 368 struct rusage r; 369 int ret; 370 mm_segment_t old_fs = get_fs(); 371 372 set_fs(KERNEL_DS); 373 ret = sys_getrusage(who, (struct rusage __user *) &r); 374 set_fs(old_fs); 375 376 if (ret) 377 return ret; 378 379 if (put_compat_rusage(&r, ru)) 380 return -EFAULT; 381 382 return 0; 383 } 384 385 asmlinkage long 386 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, 387 struct compat_rusage __user *ru) 388 { 389 if (!ru) { 390 return sys_wait4(pid, stat_addr, options, NULL); 391 } else { 392 struct rusage r; 393 int ret; 394 unsigned int status; 395 mm_segment_t old_fs = get_fs(); 396 397 set_fs (KERNEL_DS); 398 ret = sys_wait4(pid, 399 (stat_addr ? 400 (unsigned int __user *) &status : NULL), 401 options, (struct rusage __user *) &r); 402 set_fs (old_fs); 403 404 if (ret > 0) { 405 if (put_compat_rusage(&r, ru)) 406 return -EFAULT; 407 if (stat_addr && put_user(status, stat_addr)) 408 return -EFAULT; 409 } 410 return ret; 411 } 412 } 413 414 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, 415 struct compat_siginfo __user *uinfo, int options, 416 struct compat_rusage __user *uru) 417 { 418 siginfo_t info; 419 struct rusage ru; 420 long ret; 421 mm_segment_t old_fs = get_fs(); 422 423 memset(&info, 0, sizeof(info)); 424 425 set_fs(KERNEL_DS); 426 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 427 uru ? (struct rusage __user *)&ru : NULL); 428 set_fs(old_fs); 429 430 if ((ret < 0) || (info.si_signo == 0)) 431 return ret; 432 433 if (uru) { 434 ret = put_compat_rusage(&ru, uru); 435 if (ret) 436 return ret; 437 } 438 439 BUG_ON(info.si_code & __SI_MASK); 440 info.si_code |= __SI_CHLD; 441 return copy_siginfo_to_user32(uinfo, &info); 442 } 443 444 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 445 unsigned len, cpumask_t *new_mask) 446 { 447 unsigned long *k; 448 449 if (len < sizeof(cpumask_t)) 450 memset(new_mask, 0, sizeof(cpumask_t)); 451 else if (len > sizeof(cpumask_t)) 452 len = sizeof(cpumask_t); 453 454 k = cpus_addr(*new_mask); 455 return compat_get_bitmap(k, user_mask_ptr, len * 8); 456 } 457 458 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 459 unsigned int len, 460 compat_ulong_t __user *user_mask_ptr) 461 { 462 cpumask_t new_mask; 463 int retval; 464 465 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask); 466 if (retval) 467 return retval; 468 469 return sched_setaffinity(pid, new_mask); 470 } 471 472 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 473 compat_ulong_t __user *user_mask_ptr) 474 { 475 int ret; 476 cpumask_t mask; 477 unsigned long *k; 478 unsigned int min_length = sizeof(cpumask_t); 479 480 if (NR_CPUS <= BITS_PER_COMPAT_LONG) 481 min_length = sizeof(compat_ulong_t); 482 483 if (len < min_length) 484 return -EINVAL; 485 486 ret = sched_getaffinity(pid, &mask); 487 if (ret < 0) 488 return ret; 489 490 k = cpus_addr(mask); 491 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); 492 if (ret) 493 return ret; 494 495 return min_length; 496 } 497 498 static int get_compat_itimerspec(struct itimerspec *dst, 499 struct compat_itimerspec __user *src) 500 { 501 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 502 get_compat_timespec(&dst->it_value, &src->it_value)) 503 return -EFAULT; 504 return 0; 505 } 506 507 static int put_compat_itimerspec(struct compat_itimerspec __user *dst, 508 struct itimerspec *src) 509 { 510 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 511 put_compat_timespec(&src->it_value, &dst->it_value)) 512 return -EFAULT; 513 return 0; 514 } 515 516 long compat_sys_timer_create(clockid_t which_clock, 517 struct compat_sigevent __user *timer_event_spec, 518 timer_t __user *created_timer_id) 519 { 520 struct sigevent __user *event = NULL; 521 522 if (timer_event_spec) { 523 struct sigevent kevent; 524 525 event = compat_alloc_user_space(sizeof(*event)); 526 if (get_compat_sigevent(&kevent, timer_event_spec) || 527 copy_to_user(event, &kevent, sizeof(*event))) 528 return -EFAULT; 529 } 530 531 return sys_timer_create(which_clock, event, created_timer_id); 532 } 533 534 long compat_sys_timer_settime(timer_t timer_id, int flags, 535 struct compat_itimerspec __user *new, 536 struct compat_itimerspec __user *old) 537 { 538 long err; 539 mm_segment_t oldfs; 540 struct itimerspec newts, oldts; 541 542 if (!new) 543 return -EINVAL; 544 if (get_compat_itimerspec(&newts, new)) 545 return -EFAULT; 546 oldfs = get_fs(); 547 set_fs(KERNEL_DS); 548 err = sys_timer_settime(timer_id, flags, 549 (struct itimerspec __user *) &newts, 550 (struct itimerspec __user *) &oldts); 551 set_fs(oldfs); 552 if (!err && old && put_compat_itimerspec(old, &oldts)) 553 return -EFAULT; 554 return err; 555 } 556 557 long compat_sys_timer_gettime(timer_t timer_id, 558 struct compat_itimerspec __user *setting) 559 { 560 long err; 561 mm_segment_t oldfs; 562 struct itimerspec ts; 563 564 oldfs = get_fs(); 565 set_fs(KERNEL_DS); 566 err = sys_timer_gettime(timer_id, 567 (struct itimerspec __user *) &ts); 568 set_fs(oldfs); 569 if (!err && put_compat_itimerspec(setting, &ts)) 570 return -EFAULT; 571 return err; 572 } 573 574 long compat_sys_clock_settime(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 if (get_compat_timespec(&ts, tp)) 582 return -EFAULT; 583 oldfs = get_fs(); 584 set_fs(KERNEL_DS); 585 err = sys_clock_settime(which_clock, 586 (struct timespec __user *) &ts); 587 set_fs(oldfs); 588 return err; 589 } 590 591 long compat_sys_clock_gettime(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_gettime(which_clock, 601 (struct timespec __user *) &ts); 602 set_fs(oldfs); 603 if (!err && put_compat_timespec(&ts, tp)) 604 return -EFAULT; 605 return err; 606 } 607 608 long compat_sys_clock_getres(clockid_t which_clock, 609 struct compat_timespec __user *tp) 610 { 611 long err; 612 mm_segment_t oldfs; 613 struct timespec ts; 614 615 oldfs = get_fs(); 616 set_fs(KERNEL_DS); 617 err = sys_clock_getres(which_clock, 618 (struct timespec __user *) &ts); 619 set_fs(oldfs); 620 if (!err && tp && put_compat_timespec(&ts, tp)) 621 return -EFAULT; 622 return err; 623 } 624 625 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 626 struct compat_timespec __user *rqtp, 627 struct compat_timespec __user *rmtp) 628 { 629 long err; 630 mm_segment_t oldfs; 631 struct timespec in, out; 632 633 if (get_compat_timespec(&in, rqtp)) 634 return -EFAULT; 635 636 oldfs = get_fs(); 637 set_fs(KERNEL_DS); 638 err = sys_clock_nanosleep(which_clock, flags, 639 (struct timespec __user *) &in, 640 (struct timespec __user *) &out); 641 set_fs(oldfs); 642 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 643 put_compat_timespec(&out, rmtp)) 644 return -EFAULT; 645 return err; 646 } 647 648 /* 649 * We currently only need the following fields from the sigevent 650 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 651 * sigev_notify_thread_id). The others are handled in user mode. 652 * We also assume that copying sigev_value.sival_int is sufficient 653 * to keep all the bits of sigev_value.sival_ptr intact. 654 */ 655 int get_compat_sigevent(struct sigevent *event, 656 const struct compat_sigevent __user *u_event) 657 { 658 memset(event, 0, sizeof(*event)); 659 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 660 __get_user(event->sigev_value.sival_int, 661 &u_event->sigev_value.sival_int) || 662 __get_user(event->sigev_signo, &u_event->sigev_signo) || 663 __get_user(event->sigev_notify, &u_event->sigev_notify) || 664 __get_user(event->sigev_notify_thread_id, 665 &u_event->sigev_notify_thread_id)) 666 ? -EFAULT : 0; 667 } 668 669 long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask, 670 unsigned long bitmap_size) 671 { 672 int i, j; 673 unsigned long m; 674 compat_ulong_t um; 675 unsigned long nr_compat_longs; 676 677 /* align bitmap up to nearest compat_long_t boundary */ 678 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 679 680 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 681 return -EFAULT; 682 683 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 684 685 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 686 m = 0; 687 688 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 689 /* 690 * We dont want to read past the end of the userspace 691 * bitmap. We must however ensure the end of the 692 * kernel bitmap is zeroed. 693 */ 694 if (nr_compat_longs-- > 0) { 695 if (__get_user(um, umask)) 696 return -EFAULT; 697 } else { 698 um = 0; 699 } 700 701 umask++; 702 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 703 } 704 *mask++ = m; 705 } 706 707 return 0; 708 } 709 710 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 711 unsigned long bitmap_size) 712 { 713 int i, j; 714 unsigned long m; 715 compat_ulong_t um; 716 unsigned long nr_compat_longs; 717 718 /* align bitmap up to nearest compat_long_t boundary */ 719 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 720 721 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 722 return -EFAULT; 723 724 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 725 726 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 727 m = *mask++; 728 729 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 730 um = m; 731 732 /* 733 * We dont want to write past the end of the userspace 734 * bitmap. 735 */ 736 if (nr_compat_longs-- > 0) { 737 if (__put_user(um, umask)) 738 return -EFAULT; 739 } 740 741 umask++; 742 m >>= 4*sizeof(um); 743 m >>= 4*sizeof(um); 744 } 745 } 746 747 return 0; 748 } 749 750 void 751 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 752 { 753 switch (_NSIG_WORDS) { 754 #if defined (__COMPAT_ENDIAN_SWAP__) 755 case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 ); 756 case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 ); 757 case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 ); 758 case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 ); 759 #else 760 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 761 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 762 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 763 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 764 #endif 765 } 766 } 767 768 asmlinkage long 769 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 770 struct compat_siginfo __user *uinfo, 771 struct compat_timespec __user *uts, compat_size_t sigsetsize) 772 { 773 compat_sigset_t s32; 774 sigset_t s; 775 int sig; 776 struct timespec t; 777 siginfo_t info; 778 long ret, timeout = 0; 779 780 if (sigsetsize != sizeof(sigset_t)) 781 return -EINVAL; 782 783 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 784 return -EFAULT; 785 sigset_from_compat(&s, &s32); 786 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); 787 signotset(&s); 788 789 if (uts) { 790 if (get_compat_timespec (&t, uts)) 791 return -EFAULT; 792 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 793 || t.tv_sec < 0) 794 return -EINVAL; 795 } 796 797 spin_lock_irq(¤t->sighand->siglock); 798 sig = dequeue_signal(current, &s, &info); 799 if (!sig) { 800 timeout = MAX_SCHEDULE_TIMEOUT; 801 if (uts) 802 timeout = timespec_to_jiffies(&t) 803 +(t.tv_sec || t.tv_nsec); 804 if (timeout) { 805 current->real_blocked = current->blocked; 806 sigandsets(¤t->blocked, ¤t->blocked, &s); 807 808 recalc_sigpending(); 809 spin_unlock_irq(¤t->sighand->siglock); 810 811 timeout = schedule_timeout_interruptible(timeout); 812 813 spin_lock_irq(¤t->sighand->siglock); 814 sig = dequeue_signal(current, &s, &info); 815 current->blocked = current->real_blocked; 816 siginitset(¤t->real_blocked, 0); 817 recalc_sigpending(); 818 } 819 } 820 spin_unlock_irq(¤t->sighand->siglock); 821 822 if (sig) { 823 ret = sig; 824 if (uinfo) { 825 if (copy_siginfo_to_user32(uinfo, &info)) 826 ret = -EFAULT; 827 } 828 }else { 829 ret = timeout?-EINTR:-EAGAIN; 830 } 831 return ret; 832 833 } 834 835 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 836 837 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 838 839 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 840 { 841 compat_time_t i; 842 struct timeval tv; 843 844 do_gettimeofday(&tv); 845 i = tv.tv_sec; 846 847 if (tloc) { 848 if (put_user(i,tloc)) 849 i = -EFAULT; 850 } 851 return i; 852 } 853 854 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 855 { 856 struct timespec tv; 857 int err; 858 859 if (get_user(tv.tv_sec, tptr)) 860 return -EFAULT; 861 862 tv.tv_nsec = 0; 863 864 err = security_settime(&tv, NULL); 865 if (err) 866 return err; 867 868 do_settimeofday(&tv); 869 return 0; 870 } 871 872 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 873 874 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND 875 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) 876 { 877 sigset_t newset; 878 compat_sigset_t newset32; 879 880 /* XXX: Don't preclude handling different sized sigset_t's. */ 881 if (sigsetsize != sizeof(sigset_t)) 882 return -EINVAL; 883 884 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) 885 return -EFAULT; 886 sigset_from_compat(&newset, &newset32); 887 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 888 889 spin_lock_irq(¤t->sighand->siglock); 890 current->saved_sigmask = current->blocked; 891 current->blocked = newset; 892 recalc_sigpending(); 893 spin_unlock_irq(¤t->sighand->siglock); 894 895 current->state = TASK_INTERRUPTIBLE; 896 schedule(); 897 set_thread_flag(TIF_RESTORE_SIGMASK); 898 return -ERESTARTNOHAND; 899 } 900 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ 901