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 #include <linux/posix-timers.h> 26 27 #include <asm/uaccess.h> 28 29 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts) 30 { 31 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || 32 __get_user(ts->tv_sec, &cts->tv_sec) || 33 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 34 } 35 36 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts) 37 { 38 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || 39 __put_user(ts->tv_sec, &cts->tv_sec) || 40 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 41 } 42 43 static long compat_nanosleep_restart(struct restart_block *restart) 44 { 45 unsigned long expire = restart->arg0, now = jiffies; 46 struct compat_timespec __user *rmtp; 47 48 /* Did it expire while we handled signals? */ 49 if (!time_after(expire, now)) 50 return 0; 51 52 expire = schedule_timeout_interruptible(expire - now); 53 if (expire == 0) 54 return 0; 55 56 rmtp = (struct compat_timespec __user *)restart->arg1; 57 if (rmtp) { 58 struct compat_timespec ct; 59 struct timespec t; 60 61 jiffies_to_timespec(expire, &t); 62 ct.tv_sec = t.tv_sec; 63 ct.tv_nsec = t.tv_nsec; 64 if (copy_to_user(rmtp, &ct, sizeof(ct))) 65 return -EFAULT; 66 } 67 /* The 'restart' block is already filled in */ 68 return -ERESTART_RESTARTBLOCK; 69 } 70 71 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, 72 struct compat_timespec __user *rmtp) 73 { 74 struct timespec t; 75 struct restart_block *restart; 76 unsigned long expire; 77 78 if (get_compat_timespec(&t, rqtp)) 79 return -EFAULT; 80 81 if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0)) 82 return -EINVAL; 83 84 expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec); 85 expire = schedule_timeout_interruptible(expire); 86 if (expire == 0) 87 return 0; 88 89 if (rmtp) { 90 jiffies_to_timespec(expire, &t); 91 if (put_compat_timespec(&t, rmtp)) 92 return -EFAULT; 93 } 94 restart = ¤t_thread_info()->restart_block; 95 restart->fn = compat_nanosleep_restart; 96 restart->arg0 = jiffies + expire; 97 restart->arg1 = (unsigned long) rmtp; 98 return -ERESTART_RESTARTBLOCK; 99 } 100 101 static inline long get_compat_itimerval(struct itimerval *o, 102 struct compat_itimerval __user *i) 103 { 104 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 105 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 106 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 107 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 108 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 109 } 110 111 static inline long put_compat_itimerval(struct compat_itimerval __user *o, 112 struct itimerval *i) 113 { 114 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 115 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 116 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 117 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 118 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 119 } 120 121 asmlinkage long compat_sys_getitimer(int which, 122 struct compat_itimerval __user *it) 123 { 124 struct itimerval kit; 125 int error; 126 127 error = do_getitimer(which, &kit); 128 if (!error && put_compat_itimerval(it, &kit)) 129 error = -EFAULT; 130 return error; 131 } 132 133 asmlinkage long compat_sys_setitimer(int which, 134 struct compat_itimerval __user *in, 135 struct compat_itimerval __user *out) 136 { 137 struct itimerval kin, kout; 138 int error; 139 140 if (in) { 141 if (get_compat_itimerval(&kin, in)) 142 return -EFAULT; 143 } else 144 memset(&kin, 0, sizeof(kin)); 145 146 error = do_setitimer(which, &kin, out ? &kout : NULL); 147 if (error || !out) 148 return error; 149 if (put_compat_itimerval(out, &kout)) 150 return -EFAULT; 151 return 0; 152 } 153 154 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) 155 { 156 /* 157 * In the SMP world we might just be unlucky and have one of 158 * the times increment as we use it. Since the value is an 159 * atomically safe type this is just fine. Conceptually its 160 * as if the syscall took an instant longer to occur. 161 */ 162 if (tbuf) { 163 struct compat_tms tmp; 164 struct task_struct *tsk = current; 165 struct task_struct *t; 166 cputime_t utime, stime, cutime, cstime; 167 168 read_lock(&tasklist_lock); 169 utime = tsk->signal->utime; 170 stime = tsk->signal->stime; 171 t = tsk; 172 do { 173 utime = cputime_add(utime, t->utime); 174 stime = cputime_add(stime, t->stime); 175 t = next_thread(t); 176 } while (t != tsk); 177 178 /* 179 * While we have tasklist_lock read-locked, no dying thread 180 * can be updating current->signal->[us]time. Instead, 181 * we got their counts included in the live thread loop. 182 * However, another thread can come in right now and 183 * do a wait call that updates current->signal->c[us]time. 184 * To make sure we always see that pair updated atomically, 185 * we take the siglock around fetching them. 186 */ 187 spin_lock_irq(&tsk->sighand->siglock); 188 cutime = tsk->signal->cutime; 189 cstime = tsk->signal->cstime; 190 spin_unlock_irq(&tsk->sighand->siglock); 191 read_unlock(&tasklist_lock); 192 193 tmp.tms_utime = compat_jiffies_to_clock_t(cputime_to_jiffies(utime)); 194 tmp.tms_stime = compat_jiffies_to_clock_t(cputime_to_jiffies(stime)); 195 tmp.tms_cutime = compat_jiffies_to_clock_t(cputime_to_jiffies(cutime)); 196 tmp.tms_cstime = compat_jiffies_to_clock_t(cputime_to_jiffies(cstime)); 197 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 198 return -EFAULT; 199 } 200 return compat_jiffies_to_clock_t(jiffies); 201 } 202 203 /* 204 * Assumption: old_sigset_t and compat_old_sigset_t are both 205 * types that can be passed to put_user()/get_user(). 206 */ 207 208 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) 209 { 210 old_sigset_t s; 211 long ret; 212 mm_segment_t old_fs = get_fs(); 213 214 set_fs(KERNEL_DS); 215 ret = sys_sigpending((old_sigset_t __user *) &s); 216 set_fs(old_fs); 217 if (ret == 0) 218 ret = put_user(s, set); 219 return ret; 220 } 221 222 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set, 223 compat_old_sigset_t __user *oset) 224 { 225 old_sigset_t s; 226 long ret; 227 mm_segment_t old_fs; 228 229 if (set && get_user(s, set)) 230 return -EFAULT; 231 old_fs = get_fs(); 232 set_fs(KERNEL_DS); 233 ret = sys_sigprocmask(how, 234 set ? (old_sigset_t __user *) &s : NULL, 235 oset ? (old_sigset_t __user *) &s : NULL); 236 set_fs(old_fs); 237 if (ret == 0) 238 if (oset) 239 ret = put_user(s, oset); 240 return ret; 241 } 242 243 asmlinkage long compat_sys_setrlimit(unsigned int resource, 244 struct compat_rlimit __user *rlim) 245 { 246 struct rlimit r; 247 int ret; 248 mm_segment_t old_fs = get_fs (); 249 250 if (resource >= RLIM_NLIMITS) 251 return -EINVAL; 252 253 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 254 __get_user(r.rlim_cur, &rlim->rlim_cur) || 255 __get_user(r.rlim_max, &rlim->rlim_max)) 256 return -EFAULT; 257 258 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 259 r.rlim_cur = RLIM_INFINITY; 260 if (r.rlim_max == COMPAT_RLIM_INFINITY) 261 r.rlim_max = RLIM_INFINITY; 262 set_fs(KERNEL_DS); 263 ret = sys_setrlimit(resource, (struct rlimit __user *) &r); 264 set_fs(old_fs); 265 return ret; 266 } 267 268 #ifdef COMPAT_RLIM_OLD_INFINITY 269 270 asmlinkage long compat_sys_old_getrlimit(unsigned int resource, 271 struct compat_rlimit __user *rlim) 272 { 273 struct rlimit r; 274 int ret; 275 mm_segment_t old_fs = get_fs(); 276 277 set_fs(KERNEL_DS); 278 ret = sys_old_getrlimit(resource, &r); 279 set_fs(old_fs); 280 281 if (!ret) { 282 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 283 r.rlim_cur = COMPAT_RLIM_INFINITY; 284 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 285 r.rlim_max = COMPAT_RLIM_INFINITY; 286 287 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 288 __put_user(r.rlim_cur, &rlim->rlim_cur) || 289 __put_user(r.rlim_max, &rlim->rlim_max)) 290 return -EFAULT; 291 } 292 return ret; 293 } 294 295 #endif 296 297 asmlinkage long compat_sys_getrlimit (unsigned int resource, 298 struct compat_rlimit __user *rlim) 299 { 300 struct rlimit r; 301 int ret; 302 mm_segment_t old_fs = get_fs(); 303 304 set_fs(KERNEL_DS); 305 ret = sys_getrlimit(resource, (struct rlimit __user *) &r); 306 set_fs(old_fs); 307 if (!ret) { 308 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 309 r.rlim_cur = COMPAT_RLIM_INFINITY; 310 if (r.rlim_max > COMPAT_RLIM_INFINITY) 311 r.rlim_max = COMPAT_RLIM_INFINITY; 312 313 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 314 __put_user(r.rlim_cur, &rlim->rlim_cur) || 315 __put_user(r.rlim_max, &rlim->rlim_max)) 316 return -EFAULT; 317 } 318 return ret; 319 } 320 321 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 322 { 323 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 324 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 325 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 326 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 327 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 328 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 329 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 330 __put_user(r->ru_idrss, &ru->ru_idrss) || 331 __put_user(r->ru_isrss, &ru->ru_isrss) || 332 __put_user(r->ru_minflt, &ru->ru_minflt) || 333 __put_user(r->ru_majflt, &ru->ru_majflt) || 334 __put_user(r->ru_nswap, &ru->ru_nswap) || 335 __put_user(r->ru_inblock, &ru->ru_inblock) || 336 __put_user(r->ru_oublock, &ru->ru_oublock) || 337 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 338 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 339 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 340 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 341 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 342 return -EFAULT; 343 return 0; 344 } 345 346 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) 347 { 348 struct rusage r; 349 int ret; 350 mm_segment_t old_fs = get_fs(); 351 352 set_fs(KERNEL_DS); 353 ret = sys_getrusage(who, (struct rusage __user *) &r); 354 set_fs(old_fs); 355 356 if (ret) 357 return ret; 358 359 if (put_compat_rusage(&r, ru)) 360 return -EFAULT; 361 362 return 0; 363 } 364 365 asmlinkage long 366 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, 367 struct compat_rusage __user *ru) 368 { 369 if (!ru) { 370 return sys_wait4(pid, stat_addr, options, NULL); 371 } else { 372 struct rusage r; 373 int ret; 374 unsigned int status; 375 mm_segment_t old_fs = get_fs(); 376 377 set_fs (KERNEL_DS); 378 ret = sys_wait4(pid, 379 (stat_addr ? 380 (unsigned int __user *) &status : NULL), 381 options, (struct rusage __user *) &r); 382 set_fs (old_fs); 383 384 if (ret > 0) { 385 if (put_compat_rusage(&r, ru)) 386 return -EFAULT; 387 if (stat_addr && put_user(status, stat_addr)) 388 return -EFAULT; 389 } 390 return ret; 391 } 392 } 393 394 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, 395 struct compat_siginfo __user *uinfo, int options, 396 struct compat_rusage __user *uru) 397 { 398 siginfo_t info; 399 struct rusage ru; 400 long ret; 401 mm_segment_t old_fs = get_fs(); 402 403 memset(&info, 0, sizeof(info)); 404 405 set_fs(KERNEL_DS); 406 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 407 uru ? (struct rusage __user *)&ru : NULL); 408 set_fs(old_fs); 409 410 if ((ret < 0) || (info.si_signo == 0)) 411 return ret; 412 413 if (uru) { 414 ret = put_compat_rusage(&ru, uru); 415 if (ret) 416 return ret; 417 } 418 419 BUG_ON(info.si_code & __SI_MASK); 420 info.si_code |= __SI_CHLD; 421 return copy_siginfo_to_user32(uinfo, &info); 422 } 423 424 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 425 unsigned len, cpumask_t *new_mask) 426 { 427 unsigned long *k; 428 429 if (len < sizeof(cpumask_t)) 430 memset(new_mask, 0, sizeof(cpumask_t)); 431 else if (len > sizeof(cpumask_t)) 432 len = sizeof(cpumask_t); 433 434 k = cpus_addr(*new_mask); 435 return compat_get_bitmap(k, user_mask_ptr, len * 8); 436 } 437 438 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 439 unsigned int len, 440 compat_ulong_t __user *user_mask_ptr) 441 { 442 cpumask_t new_mask; 443 int retval; 444 445 retval = compat_get_user_cpu_mask(user_mask_ptr, len, &new_mask); 446 if (retval) 447 return retval; 448 449 return sched_setaffinity(pid, new_mask); 450 } 451 452 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 453 compat_ulong_t __user *user_mask_ptr) 454 { 455 int ret; 456 cpumask_t mask; 457 unsigned long *k; 458 unsigned int min_length = sizeof(cpumask_t); 459 460 if (NR_CPUS <= BITS_PER_COMPAT_LONG) 461 min_length = sizeof(compat_ulong_t); 462 463 if (len < min_length) 464 return -EINVAL; 465 466 ret = sched_getaffinity(pid, &mask); 467 if (ret < 0) 468 return ret; 469 470 k = cpus_addr(mask); 471 ret = compat_put_bitmap(user_mask_ptr, k, min_length * 8); 472 if (ret) 473 return ret; 474 475 return min_length; 476 } 477 478 static int get_compat_itimerspec(struct itimerspec *dst, 479 struct compat_itimerspec __user *src) 480 { 481 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 482 get_compat_timespec(&dst->it_value, &src->it_value)) 483 return -EFAULT; 484 return 0; 485 } 486 487 static int put_compat_itimerspec(struct compat_itimerspec __user *dst, 488 struct itimerspec *src) 489 { 490 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 491 put_compat_timespec(&src->it_value, &dst->it_value)) 492 return -EFAULT; 493 return 0; 494 } 495 496 long compat_sys_timer_create(clockid_t which_clock, 497 struct compat_sigevent __user *timer_event_spec, 498 timer_t __user *created_timer_id) 499 { 500 struct sigevent __user *event = NULL; 501 502 if (timer_event_spec) { 503 struct sigevent kevent; 504 505 event = compat_alloc_user_space(sizeof(*event)); 506 if (get_compat_sigevent(&kevent, timer_event_spec) || 507 copy_to_user(event, &kevent, sizeof(*event))) 508 return -EFAULT; 509 } 510 511 return sys_timer_create(which_clock, event, created_timer_id); 512 } 513 514 long compat_sys_timer_settime(timer_t timer_id, int flags, 515 struct compat_itimerspec __user *new, 516 struct compat_itimerspec __user *old) 517 { 518 long err; 519 mm_segment_t oldfs; 520 struct itimerspec newts, oldts; 521 522 if (!new) 523 return -EINVAL; 524 if (get_compat_itimerspec(&newts, new)) 525 return -EFAULT; 526 oldfs = get_fs(); 527 set_fs(KERNEL_DS); 528 err = sys_timer_settime(timer_id, flags, 529 (struct itimerspec __user *) &newts, 530 (struct itimerspec __user *) &oldts); 531 set_fs(oldfs); 532 if (!err && old && put_compat_itimerspec(old, &oldts)) 533 return -EFAULT; 534 return err; 535 } 536 537 long compat_sys_timer_gettime(timer_t timer_id, 538 struct compat_itimerspec __user *setting) 539 { 540 long err; 541 mm_segment_t oldfs; 542 struct itimerspec ts; 543 544 oldfs = get_fs(); 545 set_fs(KERNEL_DS); 546 err = sys_timer_gettime(timer_id, 547 (struct itimerspec __user *) &ts); 548 set_fs(oldfs); 549 if (!err && put_compat_itimerspec(setting, &ts)) 550 return -EFAULT; 551 return err; 552 } 553 554 long compat_sys_clock_settime(clockid_t which_clock, 555 struct compat_timespec __user *tp) 556 { 557 long err; 558 mm_segment_t oldfs; 559 struct timespec ts; 560 561 if (get_compat_timespec(&ts, tp)) 562 return -EFAULT; 563 oldfs = get_fs(); 564 set_fs(KERNEL_DS); 565 err = sys_clock_settime(which_clock, 566 (struct timespec __user *) &ts); 567 set_fs(oldfs); 568 return err; 569 } 570 571 long compat_sys_clock_gettime(clockid_t which_clock, 572 struct compat_timespec __user *tp) 573 { 574 long err; 575 mm_segment_t oldfs; 576 struct timespec ts; 577 578 oldfs = get_fs(); 579 set_fs(KERNEL_DS); 580 err = sys_clock_gettime(which_clock, 581 (struct timespec __user *) &ts); 582 set_fs(oldfs); 583 if (!err && put_compat_timespec(&ts, tp)) 584 return -EFAULT; 585 return err; 586 } 587 588 long compat_sys_clock_getres(clockid_t which_clock, 589 struct compat_timespec __user *tp) 590 { 591 long err; 592 mm_segment_t oldfs; 593 struct timespec ts; 594 595 oldfs = get_fs(); 596 set_fs(KERNEL_DS); 597 err = sys_clock_getres(which_clock, 598 (struct timespec __user *) &ts); 599 set_fs(oldfs); 600 if (!err && tp && put_compat_timespec(&ts, tp)) 601 return -EFAULT; 602 return err; 603 } 604 605 static long compat_clock_nanosleep_restart(struct restart_block *restart) 606 { 607 long err; 608 mm_segment_t oldfs; 609 struct timespec tu; 610 struct compat_timespec *rmtp = (struct compat_timespec *)(restart->arg1); 611 612 restart->arg1 = (unsigned long) &tu; 613 oldfs = get_fs(); 614 set_fs(KERNEL_DS); 615 err = clock_nanosleep_restart(restart); 616 set_fs(oldfs); 617 618 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 619 put_compat_timespec(&tu, rmtp)) 620 return -EFAULT; 621 622 if (err == -ERESTART_RESTARTBLOCK) { 623 restart->fn = compat_clock_nanosleep_restart; 624 restart->arg1 = (unsigned long) rmtp; 625 } 626 return err; 627 } 628 629 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 630 struct compat_timespec __user *rqtp, 631 struct compat_timespec __user *rmtp) 632 { 633 long err; 634 mm_segment_t oldfs; 635 struct timespec in, out; 636 struct restart_block *restart; 637 638 if (get_compat_timespec(&in, rqtp)) 639 return -EFAULT; 640 641 oldfs = get_fs(); 642 set_fs(KERNEL_DS); 643 err = sys_clock_nanosleep(which_clock, flags, 644 (struct timespec __user *) &in, 645 (struct timespec __user *) &out); 646 set_fs(oldfs); 647 648 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 649 put_compat_timespec(&out, rmtp)) 650 return -EFAULT; 651 652 if (err == -ERESTART_RESTARTBLOCK) { 653 restart = ¤t_thread_info()->restart_block; 654 restart->fn = compat_clock_nanosleep_restart; 655 restart->arg1 = (unsigned long) rmtp; 656 } 657 return err; 658 } 659 660 /* 661 * We currently only need the following fields from the sigevent 662 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 663 * sigev_notify_thread_id). The others are handled in user mode. 664 * We also assume that copying sigev_value.sival_int is sufficient 665 * to keep all the bits of sigev_value.sival_ptr intact. 666 */ 667 int get_compat_sigevent(struct sigevent *event, 668 const struct compat_sigevent __user *u_event) 669 { 670 memset(event, 0, sizeof(*event)); 671 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 672 __get_user(event->sigev_value.sival_int, 673 &u_event->sigev_value.sival_int) || 674 __get_user(event->sigev_signo, &u_event->sigev_signo) || 675 __get_user(event->sigev_notify, &u_event->sigev_notify) || 676 __get_user(event->sigev_notify_thread_id, 677 &u_event->sigev_notify_thread_id)) 678 ? -EFAULT : 0; 679 } 680 681 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 682 unsigned long bitmap_size) 683 { 684 int i, j; 685 unsigned long m; 686 compat_ulong_t um; 687 unsigned long nr_compat_longs; 688 689 /* align bitmap up to nearest compat_long_t boundary */ 690 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 691 692 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 693 return -EFAULT; 694 695 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 696 697 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 698 m = 0; 699 700 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 701 /* 702 * We dont want to read past the end of the userspace 703 * bitmap. We must however ensure the end of the 704 * kernel bitmap is zeroed. 705 */ 706 if (nr_compat_longs-- > 0) { 707 if (__get_user(um, umask)) 708 return -EFAULT; 709 } else { 710 um = 0; 711 } 712 713 umask++; 714 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 715 } 716 *mask++ = m; 717 } 718 719 return 0; 720 } 721 722 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 723 unsigned long bitmap_size) 724 { 725 int i, j; 726 unsigned long m; 727 compat_ulong_t um; 728 unsigned long nr_compat_longs; 729 730 /* align bitmap up to nearest compat_long_t boundary */ 731 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 732 733 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 734 return -EFAULT; 735 736 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 737 738 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 739 m = *mask++; 740 741 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 742 um = m; 743 744 /* 745 * We dont want to write past the end of the userspace 746 * bitmap. 747 */ 748 if (nr_compat_longs-- > 0) { 749 if (__put_user(um, umask)) 750 return -EFAULT; 751 } 752 753 umask++; 754 m >>= 4*sizeof(um); 755 m >>= 4*sizeof(um); 756 } 757 } 758 759 return 0; 760 } 761 762 void 763 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 764 { 765 switch (_NSIG_WORDS) { 766 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 767 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 768 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 769 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 770 } 771 } 772 773 asmlinkage long 774 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 775 struct compat_siginfo __user *uinfo, 776 struct compat_timespec __user *uts, compat_size_t sigsetsize) 777 { 778 compat_sigset_t s32; 779 sigset_t s; 780 int sig; 781 struct timespec t; 782 siginfo_t info; 783 long ret, timeout = 0; 784 785 if (sigsetsize != sizeof(sigset_t)) 786 return -EINVAL; 787 788 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 789 return -EFAULT; 790 sigset_from_compat(&s, &s32); 791 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); 792 signotset(&s); 793 794 if (uts) { 795 if (get_compat_timespec (&t, uts)) 796 return -EFAULT; 797 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 798 || t.tv_sec < 0) 799 return -EINVAL; 800 } 801 802 spin_lock_irq(¤t->sighand->siglock); 803 sig = dequeue_signal(current, &s, &info); 804 if (!sig) { 805 timeout = MAX_SCHEDULE_TIMEOUT; 806 if (uts) 807 timeout = timespec_to_jiffies(&t) 808 +(t.tv_sec || t.tv_nsec); 809 if (timeout) { 810 current->real_blocked = current->blocked; 811 sigandsets(¤t->blocked, ¤t->blocked, &s); 812 813 recalc_sigpending(); 814 spin_unlock_irq(¤t->sighand->siglock); 815 816 timeout = schedule_timeout_interruptible(timeout); 817 818 spin_lock_irq(¤t->sighand->siglock); 819 sig = dequeue_signal(current, &s, &info); 820 current->blocked = current->real_blocked; 821 siginitset(¤t->real_blocked, 0); 822 recalc_sigpending(); 823 } 824 } 825 spin_unlock_irq(¤t->sighand->siglock); 826 827 if (sig) { 828 ret = sig; 829 if (uinfo) { 830 if (copy_siginfo_to_user32(uinfo, &info)) 831 ret = -EFAULT; 832 } 833 }else { 834 ret = timeout?-EINTR:-EAGAIN; 835 } 836 return ret; 837 838 } 839 840 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 841 842 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 843 844 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 845 { 846 compat_time_t i; 847 struct timeval tv; 848 849 do_gettimeofday(&tv); 850 i = tv.tv_sec; 851 852 if (tloc) { 853 if (put_user(i,tloc)) 854 i = -EFAULT; 855 } 856 return i; 857 } 858 859 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 860 { 861 struct timespec tv; 862 int err; 863 864 if (get_user(tv.tv_sec, tptr)) 865 return -EFAULT; 866 867 tv.tv_nsec = 0; 868 869 err = security_settime(&tv, NULL); 870 if (err) 871 return err; 872 873 do_settimeofday(&tv); 874 return 0; 875 } 876 877 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 878 879 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND 880 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) 881 { 882 sigset_t newset; 883 compat_sigset_t newset32; 884 885 /* XXX: Don't preclude handling different sized sigset_t's. */ 886 if (sigsetsize != sizeof(sigset_t)) 887 return -EINVAL; 888 889 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) 890 return -EFAULT; 891 sigset_from_compat(&newset, &newset32); 892 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 893 894 spin_lock_irq(¤t->sighand->siglock); 895 current->saved_sigmask = current->blocked; 896 current->blocked = newset; 897 recalc_sigpending(); 898 spin_unlock_irq(¤t->sighand->siglock); 899 900 current->state = TASK_INTERRUPTIBLE; 901 schedule(); 902 set_thread_flag(TIF_RESTORE_SIGMASK); 903 return -ERESTARTNOHAND; 904 } 905 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ 906 907 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) 908 { 909 struct timex txc; 910 int ret; 911 912 memset(&txc, 0, sizeof(struct timex)); 913 914 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || 915 __get_user(txc.modes, &utp->modes) || 916 __get_user(txc.offset, &utp->offset) || 917 __get_user(txc.freq, &utp->freq) || 918 __get_user(txc.maxerror, &utp->maxerror) || 919 __get_user(txc.esterror, &utp->esterror) || 920 __get_user(txc.status, &utp->status) || 921 __get_user(txc.constant, &utp->constant) || 922 __get_user(txc.precision, &utp->precision) || 923 __get_user(txc.tolerance, &utp->tolerance) || 924 __get_user(txc.time.tv_sec, &utp->time.tv_sec) || 925 __get_user(txc.time.tv_usec, &utp->time.tv_usec) || 926 __get_user(txc.tick, &utp->tick) || 927 __get_user(txc.ppsfreq, &utp->ppsfreq) || 928 __get_user(txc.jitter, &utp->jitter) || 929 __get_user(txc.shift, &utp->shift) || 930 __get_user(txc.stabil, &utp->stabil) || 931 __get_user(txc.jitcnt, &utp->jitcnt) || 932 __get_user(txc.calcnt, &utp->calcnt) || 933 __get_user(txc.errcnt, &utp->errcnt) || 934 __get_user(txc.stbcnt, &utp->stbcnt)) 935 return -EFAULT; 936 937 ret = do_adjtimex(&txc); 938 939 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || 940 __put_user(txc.modes, &utp->modes) || 941 __put_user(txc.offset, &utp->offset) || 942 __put_user(txc.freq, &utp->freq) || 943 __put_user(txc.maxerror, &utp->maxerror) || 944 __put_user(txc.esterror, &utp->esterror) || 945 __put_user(txc.status, &utp->status) || 946 __put_user(txc.constant, &utp->constant) || 947 __put_user(txc.precision, &utp->precision) || 948 __put_user(txc.tolerance, &utp->tolerance) || 949 __put_user(txc.time.tv_sec, &utp->time.tv_sec) || 950 __put_user(txc.time.tv_usec, &utp->time.tv_usec) || 951 __put_user(txc.tick, &utp->tick) || 952 __put_user(txc.ppsfreq, &utp->ppsfreq) || 953 __put_user(txc.jitter, &utp->jitter) || 954 __put_user(txc.shift, &utp->shift) || 955 __put_user(txc.stabil, &utp->stabil) || 956 __put_user(txc.jitcnt, &utp->jitcnt) || 957 __put_user(txc.calcnt, &utp->calcnt) || 958 __put_user(txc.errcnt, &utp->errcnt) || 959 __put_user(txc.stbcnt, &utp->stbcnt)) 960 ret = -EFAULT; 961 962 return ret; 963 } 964 965 #ifdef CONFIG_NUMA 966 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages, 967 compat_uptr_t __user *pages32, 968 const int __user *nodes, 969 int __user *status, 970 int flags) 971 { 972 const void __user * __user *pages; 973 int i; 974 975 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 976 for (i = 0; i < nr_pages; i++) { 977 compat_uptr_t p; 978 979 if (get_user(p, pages32 + i) || 980 put_user(compat_ptr(p), pages + i)) 981 return -EFAULT; 982 } 983 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 984 } 985 986 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, 987 compat_ulong_t maxnode, 988 const compat_ulong_t __user *old_nodes, 989 const compat_ulong_t __user *new_nodes) 990 { 991 unsigned long __user *old = NULL; 992 unsigned long __user *new = NULL; 993 nodemask_t tmp_mask; 994 unsigned long nr_bits; 995 unsigned long size; 996 997 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 998 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 999 if (old_nodes) { 1000 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1001 return -EFAULT; 1002 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1003 if (new_nodes) 1004 new = old + size / sizeof(unsigned long); 1005 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1006 return -EFAULT; 1007 } 1008 if (new_nodes) { 1009 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1010 return -EFAULT; 1011 if (new == NULL) 1012 new = compat_alloc_user_space(size); 1013 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1014 return -EFAULT; 1015 } 1016 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1017 } 1018 #endif 1019 1020 struct compat_sysinfo { 1021 s32 uptime; 1022 u32 loads[3]; 1023 u32 totalram; 1024 u32 freeram; 1025 u32 sharedram; 1026 u32 bufferram; 1027 u32 totalswap; 1028 u32 freeswap; 1029 u16 procs; 1030 u16 pad; 1031 u32 totalhigh; 1032 u32 freehigh; 1033 u32 mem_unit; 1034 char _f[20-2*sizeof(u32)-sizeof(int)]; 1035 }; 1036 1037 asmlinkage long 1038 compat_sys_sysinfo(struct compat_sysinfo __user *info) 1039 { 1040 struct sysinfo s; 1041 1042 do_sysinfo(&s); 1043 1044 /* Check to see if any memory value is too large for 32-bit and scale 1045 * down if needed 1046 */ 1047 if ((s.totalram >> 32) || (s.totalswap >> 32)) { 1048 int bitcount = 0; 1049 1050 while (s.mem_unit < PAGE_SIZE) { 1051 s.mem_unit <<= 1; 1052 bitcount++; 1053 } 1054 1055 s.totalram >>= bitcount; 1056 s.freeram >>= bitcount; 1057 s.sharedram >>= bitcount; 1058 s.bufferram >>= bitcount; 1059 s.totalswap >>= bitcount; 1060 s.freeswap >>= bitcount; 1061 s.totalhigh >>= bitcount; 1062 s.freehigh >>= bitcount; 1063 } 1064 1065 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || 1066 __put_user (s.uptime, &info->uptime) || 1067 __put_user (s.loads[0], &info->loads[0]) || 1068 __put_user (s.loads[1], &info->loads[1]) || 1069 __put_user (s.loads[2], &info->loads[2]) || 1070 __put_user (s.totalram, &info->totalram) || 1071 __put_user (s.freeram, &info->freeram) || 1072 __put_user (s.sharedram, &info->sharedram) || 1073 __put_user (s.bufferram, &info->bufferram) || 1074 __put_user (s.totalswap, &info->totalswap) || 1075 __put_user (s.freeswap, &info->freeswap) || 1076 __put_user (s.procs, &info->procs) || 1077 __put_user (s.totalhigh, &info->totalhigh) || 1078 __put_user (s.freehigh, &info->freehigh) || 1079 __put_user (s.mem_unit, &info->mem_unit)) 1080 return -EFAULT; 1081 1082 return 0; 1083 } 1084 1085