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 #include <linux/migrate.h> 25 26 #include <asm/uaccess.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 asmlinkage long compat_sys_setrlimit(unsigned int resource, 243 struct compat_rlimit __user *rlim) 244 { 245 struct rlimit r; 246 int ret; 247 mm_segment_t old_fs = get_fs (); 248 249 if (resource >= RLIM_NLIMITS) 250 return -EINVAL; 251 252 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 253 __get_user(r.rlim_cur, &rlim->rlim_cur) || 254 __get_user(r.rlim_max, &rlim->rlim_max)) 255 return -EFAULT; 256 257 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 258 r.rlim_cur = RLIM_INFINITY; 259 if (r.rlim_max == COMPAT_RLIM_INFINITY) 260 r.rlim_max = RLIM_INFINITY; 261 set_fs(KERNEL_DS); 262 ret = sys_setrlimit(resource, (struct rlimit __user *) &r); 263 set_fs(old_fs); 264 return ret; 265 } 266 267 #ifdef COMPAT_RLIM_OLD_INFINITY 268 269 asmlinkage long compat_sys_old_getrlimit(unsigned int resource, 270 struct compat_rlimit __user *rlim) 271 { 272 struct rlimit r; 273 int ret; 274 mm_segment_t old_fs = get_fs(); 275 276 set_fs(KERNEL_DS); 277 ret = sys_old_getrlimit(resource, &r); 278 set_fs(old_fs); 279 280 if (!ret) { 281 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 282 r.rlim_cur = COMPAT_RLIM_INFINITY; 283 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 284 r.rlim_max = COMPAT_RLIM_INFINITY; 285 286 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 287 __put_user(r.rlim_cur, &rlim->rlim_cur) || 288 __put_user(r.rlim_max, &rlim->rlim_max)) 289 return -EFAULT; 290 } 291 return ret; 292 } 293 294 #endif 295 296 asmlinkage long compat_sys_getrlimit (unsigned int resource, 297 struct compat_rlimit __user *rlim) 298 { 299 struct rlimit r; 300 int ret; 301 mm_segment_t old_fs = get_fs(); 302 303 set_fs(KERNEL_DS); 304 ret = sys_getrlimit(resource, (struct rlimit __user *) &r); 305 set_fs(old_fs); 306 if (!ret) { 307 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 308 r.rlim_cur = COMPAT_RLIM_INFINITY; 309 if (r.rlim_max > COMPAT_RLIM_INFINITY) 310 r.rlim_max = COMPAT_RLIM_INFINITY; 311 312 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 313 __put_user(r.rlim_cur, &rlim->rlim_cur) || 314 __put_user(r.rlim_max, &rlim->rlim_max)) 315 return -EFAULT; 316 } 317 return ret; 318 } 319 320 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 321 { 322 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 323 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 324 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 325 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 326 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 327 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 328 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 329 __put_user(r->ru_idrss, &ru->ru_idrss) || 330 __put_user(r->ru_isrss, &ru->ru_isrss) || 331 __put_user(r->ru_minflt, &ru->ru_minflt) || 332 __put_user(r->ru_majflt, &ru->ru_majflt) || 333 __put_user(r->ru_nswap, &ru->ru_nswap) || 334 __put_user(r->ru_inblock, &ru->ru_inblock) || 335 __put_user(r->ru_oublock, &ru->ru_oublock) || 336 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 337 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 338 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 339 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 340 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 341 return -EFAULT; 342 return 0; 343 } 344 345 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) 346 { 347 struct rusage r; 348 int ret; 349 mm_segment_t old_fs = get_fs(); 350 351 set_fs(KERNEL_DS); 352 ret = sys_getrusage(who, (struct rusage __user *) &r); 353 set_fs(old_fs); 354 355 if (ret) 356 return ret; 357 358 if (put_compat_rusage(&r, ru)) 359 return -EFAULT; 360 361 return 0; 362 } 363 364 asmlinkage long 365 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, 366 struct compat_rusage __user *ru) 367 { 368 if (!ru) { 369 return sys_wait4(pid, stat_addr, options, NULL); 370 } else { 371 struct rusage r; 372 int ret; 373 unsigned int status; 374 mm_segment_t old_fs = get_fs(); 375 376 set_fs (KERNEL_DS); 377 ret = sys_wait4(pid, 378 (stat_addr ? 379 (unsigned int __user *) &status : NULL), 380 options, (struct rusage __user *) &r); 381 set_fs (old_fs); 382 383 if (ret > 0) { 384 if (put_compat_rusage(&r, ru)) 385 return -EFAULT; 386 if (stat_addr && put_user(status, stat_addr)) 387 return -EFAULT; 388 } 389 return ret; 390 } 391 } 392 393 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, 394 struct compat_siginfo __user *uinfo, int options, 395 struct compat_rusage __user *uru) 396 { 397 siginfo_t info; 398 struct rusage ru; 399 long ret; 400 mm_segment_t old_fs = get_fs(); 401 402 memset(&info, 0, sizeof(info)); 403 404 set_fs(KERNEL_DS); 405 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 406 uru ? (struct rusage __user *)&ru : NULL); 407 set_fs(old_fs); 408 409 if ((ret < 0) || (info.si_signo == 0)) 410 return ret; 411 412 if (uru) { 413 ret = put_compat_rusage(&ru, uru); 414 if (ret) 415 return ret; 416 } 417 418 BUG_ON(info.si_code & __SI_MASK); 419 info.si_code |= __SI_CHLD; 420 return copy_siginfo_to_user32(uinfo, &info); 421 } 422 423 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 424 unsigned len, cpumask_t *new_mask) 425 { 426 unsigned long *k; 427 428 if (len < sizeof(cpumask_t)) 429 memset(new_mask, 0, sizeof(cpumask_t)); 430 else if (len > sizeof(cpumask_t)) 431 len = sizeof(cpumask_t); 432 433 k = cpus_addr(*new_mask); 434 return compat_get_bitmap(k, user_mask_ptr, len * 8); 435 } 436 437 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 438 unsigned int len, 439 compat_ulong_t __user *user_mask_ptr) 440 { 441 cpumask_t new_mask; 442 int retval; 443 444 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask); 445 if (retval) 446 return retval; 447 448 return sched_setaffinity(pid, new_mask); 449 } 450 451 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 452 compat_ulong_t __user *user_mask_ptr) 453 { 454 int ret; 455 cpumask_t mask; 456 unsigned long *k; 457 unsigned int min_length = sizeof(cpumask_t); 458 459 if (NR_CPUS <= BITS_PER_COMPAT_LONG) 460 min_length = sizeof(compat_ulong_t); 461 462 if (len < min_length) 463 return -EINVAL; 464 465 ret = sched_getaffinity(pid, &mask); 466 if (ret < 0) 467 return ret; 468 469 k = cpus_addr(mask); 470 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); 471 if (ret) 472 return ret; 473 474 return min_length; 475 } 476 477 static int get_compat_itimerspec(struct itimerspec *dst, 478 struct compat_itimerspec __user *src) 479 { 480 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 481 get_compat_timespec(&dst->it_value, &src->it_value)) 482 return -EFAULT; 483 return 0; 484 } 485 486 static int put_compat_itimerspec(struct compat_itimerspec __user *dst, 487 struct itimerspec *src) 488 { 489 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 490 put_compat_timespec(&src->it_value, &dst->it_value)) 491 return -EFAULT; 492 return 0; 493 } 494 495 long compat_sys_timer_create(clockid_t which_clock, 496 struct compat_sigevent __user *timer_event_spec, 497 timer_t __user *created_timer_id) 498 { 499 struct sigevent __user *event = NULL; 500 501 if (timer_event_spec) { 502 struct sigevent kevent; 503 504 event = compat_alloc_user_space(sizeof(*event)); 505 if (get_compat_sigevent(&kevent, timer_event_spec) || 506 copy_to_user(event, &kevent, sizeof(*event))) 507 return -EFAULT; 508 } 509 510 return sys_timer_create(which_clock, event, created_timer_id); 511 } 512 513 long compat_sys_timer_settime(timer_t timer_id, int flags, 514 struct compat_itimerspec __user *new, 515 struct compat_itimerspec __user *old) 516 { 517 long err; 518 mm_segment_t oldfs; 519 struct itimerspec newts, oldts; 520 521 if (!new) 522 return -EINVAL; 523 if (get_compat_itimerspec(&newts, new)) 524 return -EFAULT; 525 oldfs = get_fs(); 526 set_fs(KERNEL_DS); 527 err = sys_timer_settime(timer_id, flags, 528 (struct itimerspec __user *) &newts, 529 (struct itimerspec __user *) &oldts); 530 set_fs(oldfs); 531 if (!err && old && put_compat_itimerspec(old, &oldts)) 532 return -EFAULT; 533 return err; 534 } 535 536 long compat_sys_timer_gettime(timer_t timer_id, 537 struct compat_itimerspec __user *setting) 538 { 539 long err; 540 mm_segment_t oldfs; 541 struct itimerspec ts; 542 543 oldfs = get_fs(); 544 set_fs(KERNEL_DS); 545 err = sys_timer_gettime(timer_id, 546 (struct itimerspec __user *) &ts); 547 set_fs(oldfs); 548 if (!err && put_compat_itimerspec(setting, &ts)) 549 return -EFAULT; 550 return err; 551 } 552 553 long compat_sys_clock_settime(clockid_t which_clock, 554 struct compat_timespec __user *tp) 555 { 556 long err; 557 mm_segment_t oldfs; 558 struct timespec ts; 559 560 if (get_compat_timespec(&ts, tp)) 561 return -EFAULT; 562 oldfs = get_fs(); 563 set_fs(KERNEL_DS); 564 err = sys_clock_settime(which_clock, 565 (struct timespec __user *) &ts); 566 set_fs(oldfs); 567 return err; 568 } 569 570 long compat_sys_clock_gettime(clockid_t which_clock, 571 struct compat_timespec __user *tp) 572 { 573 long err; 574 mm_segment_t oldfs; 575 struct timespec ts; 576 577 oldfs = get_fs(); 578 set_fs(KERNEL_DS); 579 err = sys_clock_gettime(which_clock, 580 (struct timespec __user *) &ts); 581 set_fs(oldfs); 582 if (!err && put_compat_timespec(&ts, tp)) 583 return -EFAULT; 584 return err; 585 } 586 587 long compat_sys_clock_getres(clockid_t which_clock, 588 struct compat_timespec __user *tp) 589 { 590 long err; 591 mm_segment_t oldfs; 592 struct timespec ts; 593 594 oldfs = get_fs(); 595 set_fs(KERNEL_DS); 596 err = sys_clock_getres(which_clock, 597 (struct timespec __user *) &ts); 598 set_fs(oldfs); 599 if (!err && tp && put_compat_timespec(&ts, tp)) 600 return -EFAULT; 601 return err; 602 } 603 604 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 605 struct compat_timespec __user *rqtp, 606 struct compat_timespec __user *rmtp) 607 { 608 long err; 609 mm_segment_t oldfs; 610 struct timespec in, out; 611 612 if (get_compat_timespec(&in, rqtp)) 613 return -EFAULT; 614 615 oldfs = get_fs(); 616 set_fs(KERNEL_DS); 617 err = sys_clock_nanosleep(which_clock, flags, 618 (struct timespec __user *) &in, 619 (struct timespec __user *) &out); 620 set_fs(oldfs); 621 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 622 put_compat_timespec(&out, rmtp)) 623 return -EFAULT; 624 return err; 625 } 626 627 /* 628 * We currently only need the following fields from the sigevent 629 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 630 * sigev_notify_thread_id). The others are handled in user mode. 631 * We also assume that copying sigev_value.sival_int is sufficient 632 * to keep all the bits of sigev_value.sival_ptr intact. 633 */ 634 int get_compat_sigevent(struct sigevent *event, 635 const struct compat_sigevent __user *u_event) 636 { 637 memset(event, 0, sizeof(*event)); 638 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 639 __get_user(event->sigev_value.sival_int, 640 &u_event->sigev_value.sival_int) || 641 __get_user(event->sigev_signo, &u_event->sigev_signo) || 642 __get_user(event->sigev_notify, &u_event->sigev_notify) || 643 __get_user(event->sigev_notify_thread_id, 644 &u_event->sigev_notify_thread_id)) 645 ? -EFAULT : 0; 646 } 647 648 long compat_get_bitmap(unsigned long *mask, compat_ulong_t __user *umask, 649 unsigned long bitmap_size) 650 { 651 int i, j; 652 unsigned long m; 653 compat_ulong_t um; 654 unsigned long nr_compat_longs; 655 656 /* align bitmap up to nearest compat_long_t boundary */ 657 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 658 659 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 660 return -EFAULT; 661 662 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 663 664 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 665 m = 0; 666 667 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 668 /* 669 * We dont want to read past the end of the userspace 670 * bitmap. We must however ensure the end of the 671 * kernel bitmap is zeroed. 672 */ 673 if (nr_compat_longs-- > 0) { 674 if (__get_user(um, umask)) 675 return -EFAULT; 676 } else { 677 um = 0; 678 } 679 680 umask++; 681 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 682 } 683 *mask++ = m; 684 } 685 686 return 0; 687 } 688 689 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 690 unsigned long bitmap_size) 691 { 692 int i, j; 693 unsigned long m; 694 compat_ulong_t um; 695 unsigned long nr_compat_longs; 696 697 /* align bitmap up to nearest compat_long_t boundary */ 698 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 699 700 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 701 return -EFAULT; 702 703 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 704 705 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 706 m = *mask++; 707 708 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 709 um = m; 710 711 /* 712 * We dont want to write past the end of the userspace 713 * bitmap. 714 */ 715 if (nr_compat_longs-- > 0) { 716 if (__put_user(um, umask)) 717 return -EFAULT; 718 } 719 720 umask++; 721 m >>= 4*sizeof(um); 722 m >>= 4*sizeof(um); 723 } 724 } 725 726 return 0; 727 } 728 729 void 730 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 731 { 732 switch (_NSIG_WORDS) { 733 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 734 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 735 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 736 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 737 } 738 } 739 740 asmlinkage long 741 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 742 struct compat_siginfo __user *uinfo, 743 struct compat_timespec __user *uts, compat_size_t sigsetsize) 744 { 745 compat_sigset_t s32; 746 sigset_t s; 747 int sig; 748 struct timespec t; 749 siginfo_t info; 750 long ret, timeout = 0; 751 752 if (sigsetsize != sizeof(sigset_t)) 753 return -EINVAL; 754 755 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 756 return -EFAULT; 757 sigset_from_compat(&s, &s32); 758 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); 759 signotset(&s); 760 761 if (uts) { 762 if (get_compat_timespec (&t, uts)) 763 return -EFAULT; 764 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 765 || t.tv_sec < 0) 766 return -EINVAL; 767 } 768 769 spin_lock_irq(¤t->sighand->siglock); 770 sig = dequeue_signal(current, &s, &info); 771 if (!sig) { 772 timeout = MAX_SCHEDULE_TIMEOUT; 773 if (uts) 774 timeout = timespec_to_jiffies(&t) 775 +(t.tv_sec || t.tv_nsec); 776 if (timeout) { 777 current->real_blocked = current->blocked; 778 sigandsets(¤t->blocked, ¤t->blocked, &s); 779 780 recalc_sigpending(); 781 spin_unlock_irq(¤t->sighand->siglock); 782 783 timeout = schedule_timeout_interruptible(timeout); 784 785 spin_lock_irq(¤t->sighand->siglock); 786 sig = dequeue_signal(current, &s, &info); 787 current->blocked = current->real_blocked; 788 siginitset(¤t->real_blocked, 0); 789 recalc_sigpending(); 790 } 791 } 792 spin_unlock_irq(¤t->sighand->siglock); 793 794 if (sig) { 795 ret = sig; 796 if (uinfo) { 797 if (copy_siginfo_to_user32(uinfo, &info)) 798 ret = -EFAULT; 799 } 800 }else { 801 ret = timeout?-EINTR:-EAGAIN; 802 } 803 return ret; 804 805 } 806 807 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 808 809 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 810 811 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 812 { 813 compat_time_t i; 814 struct timeval tv; 815 816 do_gettimeofday(&tv); 817 i = tv.tv_sec; 818 819 if (tloc) { 820 if (put_user(i,tloc)) 821 i = -EFAULT; 822 } 823 return i; 824 } 825 826 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 827 { 828 struct timespec tv; 829 int err; 830 831 if (get_user(tv.tv_sec, tptr)) 832 return -EFAULT; 833 834 tv.tv_nsec = 0; 835 836 err = security_settime(&tv, NULL); 837 if (err) 838 return err; 839 840 do_settimeofday(&tv); 841 return 0; 842 } 843 844 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 845 846 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND 847 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) 848 { 849 sigset_t newset; 850 compat_sigset_t newset32; 851 852 /* XXX: Don't preclude handling different sized sigset_t's. */ 853 if (sigsetsize != sizeof(sigset_t)) 854 return -EINVAL; 855 856 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) 857 return -EFAULT; 858 sigset_from_compat(&newset, &newset32); 859 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 860 861 spin_lock_irq(¤t->sighand->siglock); 862 current->saved_sigmask = current->blocked; 863 current->blocked = newset; 864 recalc_sigpending(); 865 spin_unlock_irq(¤t->sighand->siglock); 866 867 current->state = TASK_INTERRUPTIBLE; 868 schedule(); 869 set_thread_flag(TIF_RESTORE_SIGMASK); 870 return -ERESTARTNOHAND; 871 } 872 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ 873 874 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) 875 { 876 struct timex txc; 877 int ret; 878 879 memset(&txc, 0, sizeof(struct timex)); 880 881 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || 882 __get_user(txc.modes, &utp->modes) || 883 __get_user(txc.offset, &utp->offset) || 884 __get_user(txc.freq, &utp->freq) || 885 __get_user(txc.maxerror, &utp->maxerror) || 886 __get_user(txc.esterror, &utp->esterror) || 887 __get_user(txc.status, &utp->status) || 888 __get_user(txc.constant, &utp->constant) || 889 __get_user(txc.precision, &utp->precision) || 890 __get_user(txc.tolerance, &utp->tolerance) || 891 __get_user(txc.time.tv_sec, &utp->time.tv_sec) || 892 __get_user(txc.time.tv_usec, &utp->time.tv_usec) || 893 __get_user(txc.tick, &utp->tick) || 894 __get_user(txc.ppsfreq, &utp->ppsfreq) || 895 __get_user(txc.jitter, &utp->jitter) || 896 __get_user(txc.shift, &utp->shift) || 897 __get_user(txc.stabil, &utp->stabil) || 898 __get_user(txc.jitcnt, &utp->jitcnt) || 899 __get_user(txc.calcnt, &utp->calcnt) || 900 __get_user(txc.errcnt, &utp->errcnt) || 901 __get_user(txc.stbcnt, &utp->stbcnt)) 902 return -EFAULT; 903 904 ret = do_adjtimex(&txc); 905 906 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || 907 __put_user(txc.modes, &utp->modes) || 908 __put_user(txc.offset, &utp->offset) || 909 __put_user(txc.freq, &utp->freq) || 910 __put_user(txc.maxerror, &utp->maxerror) || 911 __put_user(txc.esterror, &utp->esterror) || 912 __put_user(txc.status, &utp->status) || 913 __put_user(txc.constant, &utp->constant) || 914 __put_user(txc.precision, &utp->precision) || 915 __put_user(txc.tolerance, &utp->tolerance) || 916 __put_user(txc.time.tv_sec, &utp->time.tv_sec) || 917 __put_user(txc.time.tv_usec, &utp->time.tv_usec) || 918 __put_user(txc.tick, &utp->tick) || 919 __put_user(txc.ppsfreq, &utp->ppsfreq) || 920 __put_user(txc.jitter, &utp->jitter) || 921 __put_user(txc.shift, &utp->shift) || 922 __put_user(txc.stabil, &utp->stabil) || 923 __put_user(txc.jitcnt, &utp->jitcnt) || 924 __put_user(txc.calcnt, &utp->calcnt) || 925 __put_user(txc.errcnt, &utp->errcnt) || 926 __put_user(txc.stbcnt, &utp->stbcnt)) 927 ret = -EFAULT; 928 929 return ret; 930 } 931 932 #ifdef CONFIG_NUMA 933 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages, 934 compat_uptr_t __user *pages32, 935 const int __user *nodes, 936 int __user *status, 937 int flags) 938 { 939 const void __user * __user *pages; 940 int i; 941 942 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 943 for (i = 0; i < nr_pages; i++) { 944 compat_uptr_t p; 945 946 if (get_user(p, pages32 + i) || 947 put_user(compat_ptr(p), pages + i)) 948 return -EFAULT; 949 } 950 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 951 } 952 #endif 953