1 /* 2 * linux/kernel/compat.c 3 * 4 * Kernel compatibililty routines for e.g. 32 bit syscall support 5 * on 64 bit kernels. 6 * 7 * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/linkage.h> 15 #include <linux/compat.h> 16 #include <linux/errno.h> 17 #include <linux/time.h> 18 #include <linux/signal.h> 19 #include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */ 20 #include <linux/syscalls.h> 21 #include <linux/unistd.h> 22 #include <linux/security.h> 23 #include <linux/timex.h> 24 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 asmlinkage long compat_sys_setrlimit(unsigned int resource, 242 struct compat_rlimit __user *rlim) 243 { 244 struct rlimit r; 245 int ret; 246 mm_segment_t old_fs = get_fs (); 247 248 if (resource >= RLIM_NLIMITS) 249 return -EINVAL; 250 251 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 252 __get_user(r.rlim_cur, &rlim->rlim_cur) || 253 __get_user(r.rlim_max, &rlim->rlim_max)) 254 return -EFAULT; 255 256 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 257 r.rlim_cur = RLIM_INFINITY; 258 if (r.rlim_max == COMPAT_RLIM_INFINITY) 259 r.rlim_max = RLIM_INFINITY; 260 set_fs(KERNEL_DS); 261 ret = sys_setrlimit(resource, (struct rlimit __user *) &r); 262 set_fs(old_fs); 263 return ret; 264 } 265 266 #ifdef COMPAT_RLIM_OLD_INFINITY 267 268 asmlinkage long compat_sys_old_getrlimit(unsigned int resource, 269 struct compat_rlimit __user *rlim) 270 { 271 struct rlimit r; 272 int ret; 273 mm_segment_t old_fs = get_fs(); 274 275 set_fs(KERNEL_DS); 276 ret = sys_old_getrlimit(resource, &r); 277 set_fs(old_fs); 278 279 if (!ret) { 280 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 281 r.rlim_cur = COMPAT_RLIM_INFINITY; 282 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 283 r.rlim_max = COMPAT_RLIM_INFINITY; 284 285 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 286 __put_user(r.rlim_cur, &rlim->rlim_cur) || 287 __put_user(r.rlim_max, &rlim->rlim_max)) 288 return -EFAULT; 289 } 290 return ret; 291 } 292 293 #endif 294 295 asmlinkage long compat_sys_getrlimit (unsigned int resource, 296 struct compat_rlimit __user *rlim) 297 { 298 struct rlimit r; 299 int ret; 300 mm_segment_t old_fs = get_fs(); 301 302 set_fs(KERNEL_DS); 303 ret = sys_getrlimit(resource, (struct rlimit __user *) &r); 304 set_fs(old_fs); 305 if (!ret) { 306 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 307 r.rlim_cur = COMPAT_RLIM_INFINITY; 308 if (r.rlim_max > COMPAT_RLIM_INFINITY) 309 r.rlim_max = COMPAT_RLIM_INFINITY; 310 311 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 312 __put_user(r.rlim_cur, &rlim->rlim_cur) || 313 __put_user(r.rlim_max, &rlim->rlim_max)) 314 return -EFAULT; 315 } 316 return ret; 317 } 318 319 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 320 { 321 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 322 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 323 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 324 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 325 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 326 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 327 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 328 __put_user(r->ru_idrss, &ru->ru_idrss) || 329 __put_user(r->ru_isrss, &ru->ru_isrss) || 330 __put_user(r->ru_minflt, &ru->ru_minflt) || 331 __put_user(r->ru_majflt, &ru->ru_majflt) || 332 __put_user(r->ru_nswap, &ru->ru_nswap) || 333 __put_user(r->ru_inblock, &ru->ru_inblock) || 334 __put_user(r->ru_oublock, &ru->ru_oublock) || 335 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 336 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 337 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 338 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 339 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 340 return -EFAULT; 341 return 0; 342 } 343 344 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) 345 { 346 struct rusage r; 347 int ret; 348 mm_segment_t old_fs = get_fs(); 349 350 set_fs(KERNEL_DS); 351 ret = sys_getrusage(who, (struct rusage __user *) &r); 352 set_fs(old_fs); 353 354 if (ret) 355 return ret; 356 357 if (put_compat_rusage(&r, ru)) 358 return -EFAULT; 359 360 return 0; 361 } 362 363 asmlinkage long 364 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, 365 struct compat_rusage __user *ru) 366 { 367 if (!ru) { 368 return sys_wait4(pid, stat_addr, options, NULL); 369 } else { 370 struct rusage r; 371 int ret; 372 unsigned int status; 373 mm_segment_t old_fs = get_fs(); 374 375 set_fs (KERNEL_DS); 376 ret = sys_wait4(pid, 377 (stat_addr ? 378 (unsigned int __user *) &status : NULL), 379 options, (struct rusage __user *) &r); 380 set_fs (old_fs); 381 382 if (ret > 0) { 383 if (put_compat_rusage(&r, ru)) 384 return -EFAULT; 385 if (stat_addr && put_user(status, stat_addr)) 386 return -EFAULT; 387 } 388 return ret; 389 } 390 } 391 392 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, 393 struct compat_siginfo __user *uinfo, int options, 394 struct compat_rusage __user *uru) 395 { 396 siginfo_t info; 397 struct rusage ru; 398 long ret; 399 mm_segment_t old_fs = get_fs(); 400 401 memset(&info, 0, sizeof(info)); 402 403 set_fs(KERNEL_DS); 404 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 405 uru ? (struct rusage __user *)&ru : NULL); 406 set_fs(old_fs); 407 408 if ((ret < 0) || (info.si_signo == 0)) 409 return ret; 410 411 if (uru) { 412 ret = put_compat_rusage(&ru, uru); 413 if (ret) 414 return ret; 415 } 416 417 BUG_ON(info.si_code & __SI_MASK); 418 info.si_code |= __SI_CHLD; 419 return copy_siginfo_to_user32(uinfo, &info); 420 } 421 422 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 423 unsigned len, cpumask_t *new_mask) 424 { 425 unsigned long *k; 426 427 if (len < sizeof(cpumask_t)) 428 memset(new_mask, 0, sizeof(cpumask_t)); 429 else if (len > sizeof(cpumask_t)) 430 len = sizeof(cpumask_t); 431 432 k = cpus_addr(*new_mask); 433 return compat_get_bitmap(k, user_mask_ptr, len * 8); 434 } 435 436 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 437 unsigned int len, 438 compat_ulong_t __user *user_mask_ptr) 439 { 440 cpumask_t new_mask; 441 int retval; 442 443 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask); 444 if (retval) 445 return retval; 446 447 return sched_setaffinity(pid, new_mask); 448 } 449 450 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 451 compat_ulong_t __user *user_mask_ptr) 452 { 453 int ret; 454 cpumask_t mask; 455 unsigned long *k; 456 unsigned int min_length = sizeof(cpumask_t); 457 458 if (NR_CPUS <= BITS_PER_COMPAT_LONG) 459 min_length = sizeof(compat_ulong_t); 460 461 if (len < min_length) 462 return -EINVAL; 463 464 ret = sched_getaffinity(pid, &mask); 465 if (ret < 0) 466 return ret; 467 468 k = cpus_addr(mask); 469 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); 470 if (ret) 471 return ret; 472 473 return min_length; 474 } 475 476 static int get_compat_itimerspec(struct itimerspec *dst, 477 struct compat_itimerspec __user *src) 478 { 479 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 480 get_compat_timespec(&dst->it_value, &src->it_value)) 481 return -EFAULT; 482 return 0; 483 } 484 485 static int put_compat_itimerspec(struct compat_itimerspec __user *dst, 486 struct itimerspec *src) 487 { 488 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 489 put_compat_timespec(&src->it_value, &dst->it_value)) 490 return -EFAULT; 491 return 0; 492 } 493 494 long compat_sys_timer_create(clockid_t which_clock, 495 struct compat_sigevent __user *timer_event_spec, 496 timer_t __user *created_timer_id) 497 { 498 struct sigevent __user *event = NULL; 499 500 if (timer_event_spec) { 501 struct sigevent kevent; 502 503 event = compat_alloc_user_space(sizeof(*event)); 504 if (get_compat_sigevent(&kevent, timer_event_spec) || 505 copy_to_user(event, &kevent, sizeof(*event))) 506 return -EFAULT; 507 } 508 509 return sys_timer_create(which_clock, event, created_timer_id); 510 } 511 512 long compat_sys_timer_settime(timer_t timer_id, int flags, 513 struct compat_itimerspec __user *new, 514 struct compat_itimerspec __user *old) 515 { 516 long err; 517 mm_segment_t oldfs; 518 struct itimerspec newts, oldts; 519 520 if (!new) 521 return -EINVAL; 522 if (get_compat_itimerspec(&newts, new)) 523 return -EFAULT; 524 oldfs = get_fs(); 525 set_fs(KERNEL_DS); 526 err = sys_timer_settime(timer_id, flags, 527 (struct itimerspec __user *) &newts, 528 (struct itimerspec __user *) &oldts); 529 set_fs(oldfs); 530 if (!err && old && put_compat_itimerspec(old, &oldts)) 531 return -EFAULT; 532 return err; 533 } 534 535 long compat_sys_timer_gettime(timer_t timer_id, 536 struct compat_itimerspec __user *setting) 537 { 538 long err; 539 mm_segment_t oldfs; 540 struct itimerspec ts; 541 542 oldfs = get_fs(); 543 set_fs(KERNEL_DS); 544 err = sys_timer_gettime(timer_id, 545 (struct itimerspec __user *) &ts); 546 set_fs(oldfs); 547 if (!err && put_compat_itimerspec(setting, &ts)) 548 return -EFAULT; 549 return err; 550 } 551 552 long compat_sys_clock_settime(clockid_t which_clock, 553 struct compat_timespec __user *tp) 554 { 555 long err; 556 mm_segment_t oldfs; 557 struct timespec ts; 558 559 if (get_compat_timespec(&ts, tp)) 560 return -EFAULT; 561 oldfs = get_fs(); 562 set_fs(KERNEL_DS); 563 err = sys_clock_settime(which_clock, 564 (struct timespec __user *) &ts); 565 set_fs(oldfs); 566 return err; 567 } 568 569 long compat_sys_clock_gettime(clockid_t which_clock, 570 struct compat_timespec __user *tp) 571 { 572 long err; 573 mm_segment_t oldfs; 574 struct timespec ts; 575 576 oldfs = get_fs(); 577 set_fs(KERNEL_DS); 578 err = sys_clock_gettime(which_clock, 579 (struct timespec __user *) &ts); 580 set_fs(oldfs); 581 if (!err && put_compat_timespec(&ts, tp)) 582 return -EFAULT; 583 return err; 584 } 585 586 long compat_sys_clock_getres(clockid_t which_clock, 587 struct compat_timespec __user *tp) 588 { 589 long err; 590 mm_segment_t oldfs; 591 struct timespec ts; 592 593 oldfs = get_fs(); 594 set_fs(KERNEL_DS); 595 err = sys_clock_getres(which_clock, 596 (struct timespec __user *) &ts); 597 set_fs(oldfs); 598 if (!err && tp && put_compat_timespec(&ts, tp)) 599 return -EFAULT; 600 return err; 601 } 602 603 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 604 struct compat_timespec __user *rqtp, 605 struct compat_timespec __user *rmtp) 606 { 607 long err; 608 mm_segment_t oldfs; 609 struct timespec in, out; 610 611 if (get_compat_timespec(&in, rqtp)) 612 return -EFAULT; 613 614 oldfs = get_fs(); 615 set_fs(KERNEL_DS); 616 err = sys_clock_nanosleep(which_clock, flags, 617 (struct timespec __user *) &in, 618 (struct timespec __user *) &out); 619 set_fs(oldfs); 620 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 621 put_compat_timespec(&out, rmtp)) 622 return -EFAULT; 623 return err; 624 } 625 626 /* 627 * We currently only need the following fields from the sigevent 628 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 629 * sigev_notify_thread_id). The others are handled in user mode. 630 * We also assume that copying sigev_value.sival_int is sufficient 631 * to keep all the bits of sigev_value.sival_ptr intact. 632 */ 633 int get_compat_sigevent(struct sigevent *event, 634 const struct compat_sigevent __user *u_event) 635 { 636 memset(event, 0, sizeof(*event)); 637 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 638 __get_user(event->sigev_value.sival_int, 639 &u_event->sigev_value.sival_int) || 640 __get_user(event->sigev_signo, &u_event->sigev_signo) || 641 __get_user(event->sigev_notify, &u_event->sigev_notify) || 642 __get_user(event->sigev_notify_thread_id, 643 &u_event->sigev_notify_thread_id)) 644 ? -EFAULT : 0; 645 } 646 647 long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask, 648 unsigned long bitmap_size) 649 { 650 int i, j; 651 unsigned long m; 652 compat_ulong_t um; 653 unsigned long nr_compat_longs; 654 655 /* align bitmap up to nearest compat_long_t boundary */ 656 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 657 658 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 659 return -EFAULT; 660 661 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 662 663 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 664 m = 0; 665 666 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 667 /* 668 * We dont want to read past the end of the userspace 669 * bitmap. We must however ensure the end of the 670 * kernel bitmap is zeroed. 671 */ 672 if (nr_compat_longs-- > 0) { 673 if (__get_user(um, umask)) 674 return -EFAULT; 675 } else { 676 um = 0; 677 } 678 679 umask++; 680 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 681 } 682 *mask++ = m; 683 } 684 685 return 0; 686 } 687 688 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 689 unsigned long bitmap_size) 690 { 691 int i, j; 692 unsigned long m; 693 compat_ulong_t um; 694 unsigned long nr_compat_longs; 695 696 /* align bitmap up to nearest compat_long_t boundary */ 697 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 698 699 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 700 return -EFAULT; 701 702 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 703 704 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 705 m = *mask++; 706 707 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 708 um = m; 709 710 /* 711 * We dont want to write past the end of the userspace 712 * bitmap. 713 */ 714 if (nr_compat_longs-- > 0) { 715 if (__put_user(um, umask)) 716 return -EFAULT; 717 } 718 719 umask++; 720 m >>= 4*sizeof(um); 721 m >>= 4*sizeof(um); 722 } 723 } 724 725 return 0; 726 } 727 728 void 729 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 730 { 731 switch (_NSIG_WORDS) { 732 #if defined (__COMPAT_ENDIAN_SWAP__) 733 case 4: set->sig[3] = compat->sig[7] | (((long)compat->sig[6]) << 32 ); 734 case 3: set->sig[2] = compat->sig[5] | (((long)compat->sig[4]) << 32 ); 735 case 2: set->sig[1] = compat->sig[3] | (((long)compat->sig[2]) << 32 ); 736 case 1: set->sig[0] = compat->sig[1] | (((long)compat->sig[0]) << 32 ); 737 #else 738 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 739 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 740 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 741 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 742 #endif 743 } 744 } 745 746 asmlinkage long 747 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 748 struct compat_siginfo __user *uinfo, 749 struct compat_timespec __user *uts, compat_size_t sigsetsize) 750 { 751 compat_sigset_t s32; 752 sigset_t s; 753 int sig; 754 struct timespec t; 755 siginfo_t info; 756 long ret, timeout = 0; 757 758 if (sigsetsize != sizeof(sigset_t)) 759 return -EINVAL; 760 761 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 762 return -EFAULT; 763 sigset_from_compat(&s, &s32); 764 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); 765 signotset(&s); 766 767 if (uts) { 768 if (get_compat_timespec (&t, uts)) 769 return -EFAULT; 770 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 771 || t.tv_sec < 0) 772 return -EINVAL; 773 } 774 775 spin_lock_irq(¤t->sighand->siglock); 776 sig = dequeue_signal(current, &s, &info); 777 if (!sig) { 778 timeout = MAX_SCHEDULE_TIMEOUT; 779 if (uts) 780 timeout = timespec_to_jiffies(&t) 781 +(t.tv_sec || t.tv_nsec); 782 if (timeout) { 783 current->real_blocked = current->blocked; 784 sigandsets(¤t->blocked, ¤t->blocked, &s); 785 786 recalc_sigpending(); 787 spin_unlock_irq(¤t->sighand->siglock); 788 789 timeout = schedule_timeout_interruptible(timeout); 790 791 spin_lock_irq(¤t->sighand->siglock); 792 sig = dequeue_signal(current, &s, &info); 793 current->blocked = current->real_blocked; 794 siginitset(¤t->real_blocked, 0); 795 recalc_sigpending(); 796 } 797 } 798 spin_unlock_irq(¤t->sighand->siglock); 799 800 if (sig) { 801 ret = sig; 802 if (uinfo) { 803 if (copy_siginfo_to_user32(uinfo, &info)) 804 ret = -EFAULT; 805 } 806 }else { 807 ret = timeout?-EINTR:-EAGAIN; 808 } 809 return ret; 810 811 } 812 813 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 814 815 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 816 817 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 818 { 819 compat_time_t i; 820 struct timeval tv; 821 822 do_gettimeofday(&tv); 823 i = tv.tv_sec; 824 825 if (tloc) { 826 if (put_user(i,tloc)) 827 i = -EFAULT; 828 } 829 return i; 830 } 831 832 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 833 { 834 struct timespec tv; 835 int err; 836 837 if (get_user(tv.tv_sec, tptr)) 838 return -EFAULT; 839 840 tv.tv_nsec = 0; 841 842 err = security_settime(&tv, NULL); 843 if (err) 844 return err; 845 846 do_settimeofday(&tv); 847 return 0; 848 } 849 850 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 851 852 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND 853 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) 854 { 855 sigset_t newset; 856 compat_sigset_t newset32; 857 858 /* XXX: Don't preclude handling different sized sigset_t's. */ 859 if (sigsetsize != sizeof(sigset_t)) 860 return -EINVAL; 861 862 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) 863 return -EFAULT; 864 sigset_from_compat(&newset, &newset32); 865 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 866 867 spin_lock_irq(¤t->sighand->siglock); 868 current->saved_sigmask = current->blocked; 869 current->blocked = newset; 870 recalc_sigpending(); 871 spin_unlock_irq(¤t->sighand->siglock); 872 873 current->state = TASK_INTERRUPTIBLE; 874 schedule(); 875 set_thread_flag(TIF_RESTORE_SIGMASK); 876 return -ERESTARTNOHAND; 877 } 878 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ 879 880 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) 881 { 882 struct timex txc; 883 int ret; 884 885 memset(&txc, 0, sizeof(struct timex)); 886 887 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || 888 __get_user(txc.modes, &utp->modes) || 889 __get_user(txc.offset, &utp->offset) || 890 __get_user(txc.freq, &utp->freq) || 891 __get_user(txc.maxerror, &utp->maxerror) || 892 __get_user(txc.esterror, &utp->esterror) || 893 __get_user(txc.status, &utp->status) || 894 __get_user(txc.constant, &utp->constant) || 895 __get_user(txc.precision, &utp->precision) || 896 __get_user(txc.tolerance, &utp->tolerance) || 897 __get_user(txc.time.tv_sec, &utp->time.tv_sec) || 898 __get_user(txc.time.tv_usec, &utp->time.tv_usec) || 899 __get_user(txc.tick, &utp->tick) || 900 __get_user(txc.ppsfreq, &utp->ppsfreq) || 901 __get_user(txc.jitter, &utp->jitter) || 902 __get_user(txc.shift, &utp->shift) || 903 __get_user(txc.stabil, &utp->stabil) || 904 __get_user(txc.jitcnt, &utp->jitcnt) || 905 __get_user(txc.calcnt, &utp->calcnt) || 906 __get_user(txc.errcnt, &utp->errcnt) || 907 __get_user(txc.stbcnt, &utp->stbcnt)) 908 return -EFAULT; 909 910 ret = do_adjtimex(&txc); 911 912 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || 913 __put_user(txc.modes, &utp->modes) || 914 __put_user(txc.offset, &utp->offset) || 915 __put_user(txc.freq, &utp->freq) || 916 __put_user(txc.maxerror, &utp->maxerror) || 917 __put_user(txc.esterror, &utp->esterror) || 918 __put_user(txc.status, &utp->status) || 919 __put_user(txc.constant, &utp->constant) || 920 __put_user(txc.precision, &utp->precision) || 921 __put_user(txc.tolerance, &utp->tolerance) || 922 __put_user(txc.time.tv_sec, &utp->time.tv_sec) || 923 __put_user(txc.time.tv_usec, &utp->time.tv_usec) || 924 __put_user(txc.tick, &utp->tick) || 925 __put_user(txc.ppsfreq, &utp->ppsfreq) || 926 __put_user(txc.jitter, &utp->jitter) || 927 __put_user(txc.shift, &utp->shift) || 928 __put_user(txc.stabil, &utp->stabil) || 929 __put_user(txc.jitcnt, &utp->jitcnt) || 930 __put_user(txc.calcnt, &utp->calcnt) || 931 __put_user(txc.errcnt, &utp->errcnt) || 932 __put_user(txc.stbcnt, &utp->stbcnt)) 933 ret = -EFAULT; 934 935 return ret; 936 } 937