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/export.h> 25 #include <linux/migrate.h> 26 #include <linux/posix-timers.h> 27 #include <linux/times.h> 28 #include <linux/ptrace.h> 29 #include <linux/gfp.h> 30 31 #include <linux/uaccess.h> 32 33 int compat_get_timex(struct timex *txc, const struct compat_timex __user *utp) 34 { 35 struct compat_timex tx32; 36 37 if (copy_from_user(&tx32, utp, sizeof(struct compat_timex))) 38 return -EFAULT; 39 40 txc->modes = tx32.modes; 41 txc->offset = tx32.offset; 42 txc->freq = tx32.freq; 43 txc->maxerror = tx32.maxerror; 44 txc->esterror = tx32.esterror; 45 txc->status = tx32.status; 46 txc->constant = tx32.constant; 47 txc->precision = tx32.precision; 48 txc->tolerance = tx32.tolerance; 49 txc->time.tv_sec = tx32.time.tv_sec; 50 txc->time.tv_usec = tx32.time.tv_usec; 51 txc->tick = tx32.tick; 52 txc->ppsfreq = tx32.ppsfreq; 53 txc->jitter = tx32.jitter; 54 txc->shift = tx32.shift; 55 txc->stabil = tx32.stabil; 56 txc->jitcnt = tx32.jitcnt; 57 txc->calcnt = tx32.calcnt; 58 txc->errcnt = tx32.errcnt; 59 txc->stbcnt = tx32.stbcnt; 60 61 return 0; 62 } 63 64 int compat_put_timex(struct compat_timex __user *utp, const struct timex *txc) 65 { 66 struct compat_timex tx32; 67 68 memset(&tx32, 0, sizeof(struct compat_timex)); 69 tx32.modes = txc->modes; 70 tx32.offset = txc->offset; 71 tx32.freq = txc->freq; 72 tx32.maxerror = txc->maxerror; 73 tx32.esterror = txc->esterror; 74 tx32.status = txc->status; 75 tx32.constant = txc->constant; 76 tx32.precision = txc->precision; 77 tx32.tolerance = txc->tolerance; 78 tx32.time.tv_sec = txc->time.tv_sec; 79 tx32.time.tv_usec = txc->time.tv_usec; 80 tx32.tick = txc->tick; 81 tx32.ppsfreq = txc->ppsfreq; 82 tx32.jitter = txc->jitter; 83 tx32.shift = txc->shift; 84 tx32.stabil = txc->stabil; 85 tx32.jitcnt = txc->jitcnt; 86 tx32.calcnt = txc->calcnt; 87 tx32.errcnt = txc->errcnt; 88 tx32.stbcnt = txc->stbcnt; 89 tx32.tai = txc->tai; 90 if (copy_to_user(utp, &tx32, sizeof(struct compat_timex))) 91 return -EFAULT; 92 return 0; 93 } 94 95 static int __compat_get_timeval(struct timeval *tv, const struct compat_timeval __user *ctv) 96 { 97 return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) || 98 __get_user(tv->tv_sec, &ctv->tv_sec) || 99 __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; 100 } 101 102 static int __compat_put_timeval(const struct timeval *tv, struct compat_timeval __user *ctv) 103 { 104 return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) || 105 __put_user(tv->tv_sec, &ctv->tv_sec) || 106 __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; 107 } 108 109 static int __compat_get_timespec(struct timespec *ts, const struct compat_timespec __user *cts) 110 { 111 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || 112 __get_user(ts->tv_sec, &cts->tv_sec) || 113 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 114 } 115 116 static int __compat_put_timespec(const struct timespec *ts, struct compat_timespec __user *cts) 117 { 118 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || 119 __put_user(ts->tv_sec, &cts->tv_sec) || 120 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 121 } 122 123 int compat_get_timeval(struct timeval *tv, const void __user *utv) 124 { 125 if (COMPAT_USE_64BIT_TIME) 126 return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0; 127 else 128 return __compat_get_timeval(tv, utv); 129 } 130 EXPORT_SYMBOL_GPL(compat_get_timeval); 131 132 int compat_put_timeval(const struct timeval *tv, void __user *utv) 133 { 134 if (COMPAT_USE_64BIT_TIME) 135 return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0; 136 else 137 return __compat_put_timeval(tv, utv); 138 } 139 EXPORT_SYMBOL_GPL(compat_put_timeval); 140 141 int compat_get_timespec(struct timespec *ts, const void __user *uts) 142 { 143 if (COMPAT_USE_64BIT_TIME) 144 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0; 145 else 146 return __compat_get_timespec(ts, uts); 147 } 148 EXPORT_SYMBOL_GPL(compat_get_timespec); 149 150 int compat_put_timespec(const struct timespec *ts, void __user *uts) 151 { 152 if (COMPAT_USE_64BIT_TIME) 153 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0; 154 else 155 return __compat_put_timespec(ts, uts); 156 } 157 EXPORT_SYMBOL_GPL(compat_put_timespec); 158 159 int compat_convert_timespec(struct timespec __user **kts, 160 const void __user *cts) 161 { 162 struct timespec ts; 163 struct timespec __user *uts; 164 165 if (!cts || COMPAT_USE_64BIT_TIME) { 166 *kts = (struct timespec __user *)cts; 167 return 0; 168 } 169 170 uts = compat_alloc_user_space(sizeof(ts)); 171 if (!uts) 172 return -EFAULT; 173 if (compat_get_timespec(&ts, cts)) 174 return -EFAULT; 175 if (copy_to_user(uts, &ts, sizeof(ts))) 176 return -EFAULT; 177 178 *kts = uts; 179 return 0; 180 } 181 182 int get_compat_itimerval(struct itimerval *o, const struct compat_itimerval __user *i) 183 { 184 struct compat_itimerval v32; 185 186 if (copy_from_user(&v32, i, sizeof(struct compat_itimerval))) 187 return -EFAULT; 188 o->it_interval.tv_sec = v32.it_interval.tv_sec; 189 o->it_interval.tv_usec = v32.it_interval.tv_usec; 190 o->it_value.tv_sec = v32.it_value.tv_sec; 191 o->it_value.tv_usec = v32.it_value.tv_usec; 192 return 0; 193 } 194 195 int put_compat_itimerval(struct compat_itimerval __user *o, const struct itimerval *i) 196 { 197 struct compat_itimerval v32; 198 199 v32.it_interval.tv_sec = i->it_interval.tv_sec; 200 v32.it_interval.tv_usec = i->it_interval.tv_usec; 201 v32.it_value.tv_sec = i->it_value.tv_sec; 202 v32.it_value.tv_usec = i->it_value.tv_usec; 203 return copy_to_user(o, &v32, sizeof(struct compat_itimerval)) ? -EFAULT : 0; 204 } 205 206 static compat_clock_t clock_t_to_compat_clock_t(clock_t x) 207 { 208 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); 209 } 210 211 COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf) 212 { 213 if (tbuf) { 214 struct tms tms; 215 struct compat_tms tmp; 216 217 do_sys_times(&tms); 218 /* Convert our struct tms to the compat version. */ 219 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); 220 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); 221 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); 222 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); 223 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 224 return -EFAULT; 225 } 226 force_successful_syscall_return(); 227 return compat_jiffies_to_clock_t(jiffies); 228 } 229 230 #ifdef __ARCH_WANT_SYS_SIGPENDING 231 232 /* 233 * Assumption: old_sigset_t and compat_old_sigset_t are both 234 * types that can be passed to put_user()/get_user(). 235 */ 236 237 COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set) 238 { 239 old_sigset_t s; 240 long ret; 241 mm_segment_t old_fs = get_fs(); 242 243 set_fs(KERNEL_DS); 244 ret = sys_sigpending((old_sigset_t __user *) &s); 245 set_fs(old_fs); 246 if (ret == 0) 247 ret = put_user(s, set); 248 return ret; 249 } 250 251 #endif 252 253 #ifdef __ARCH_WANT_SYS_SIGPROCMASK 254 255 /* 256 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the 257 * blocked set of signals to the supplied signal set 258 */ 259 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set) 260 { 261 memcpy(blocked->sig, &set, sizeof(set)); 262 } 263 264 COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how, 265 compat_old_sigset_t __user *, nset, 266 compat_old_sigset_t __user *, oset) 267 { 268 old_sigset_t old_set, new_set; 269 sigset_t new_blocked; 270 271 old_set = current->blocked.sig[0]; 272 273 if (nset) { 274 if (get_user(new_set, nset)) 275 return -EFAULT; 276 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP)); 277 278 new_blocked = current->blocked; 279 280 switch (how) { 281 case SIG_BLOCK: 282 sigaddsetmask(&new_blocked, new_set); 283 break; 284 case SIG_UNBLOCK: 285 sigdelsetmask(&new_blocked, new_set); 286 break; 287 case SIG_SETMASK: 288 compat_sig_setmask(&new_blocked, new_set); 289 break; 290 default: 291 return -EINVAL; 292 } 293 294 set_current_blocked(&new_blocked); 295 } 296 297 if (oset) { 298 if (put_user(old_set, oset)) 299 return -EFAULT; 300 } 301 302 return 0; 303 } 304 305 #endif 306 307 COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource, 308 struct compat_rlimit __user *, rlim) 309 { 310 struct rlimit r; 311 312 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 313 __get_user(r.rlim_cur, &rlim->rlim_cur) || 314 __get_user(r.rlim_max, &rlim->rlim_max)) 315 return -EFAULT; 316 317 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 318 r.rlim_cur = RLIM_INFINITY; 319 if (r.rlim_max == COMPAT_RLIM_INFINITY) 320 r.rlim_max = RLIM_INFINITY; 321 return do_prlimit(current, resource, &r, NULL); 322 } 323 324 #ifdef COMPAT_RLIM_OLD_INFINITY 325 326 COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, 327 struct compat_rlimit __user *, rlim) 328 { 329 struct rlimit r; 330 int ret; 331 mm_segment_t old_fs = get_fs(); 332 333 set_fs(KERNEL_DS); 334 ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r); 335 set_fs(old_fs); 336 337 if (!ret) { 338 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 339 r.rlim_cur = COMPAT_RLIM_INFINITY; 340 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 341 r.rlim_max = COMPAT_RLIM_INFINITY; 342 343 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 344 __put_user(r.rlim_cur, &rlim->rlim_cur) || 345 __put_user(r.rlim_max, &rlim->rlim_max)) 346 return -EFAULT; 347 } 348 return ret; 349 } 350 351 #endif 352 353 COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource, 354 struct compat_rlimit __user *, rlim) 355 { 356 struct rlimit r; 357 int ret; 358 359 ret = do_prlimit(current, resource, NULL, &r); 360 if (!ret) { 361 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 362 r.rlim_cur = COMPAT_RLIM_INFINITY; 363 if (r.rlim_max > COMPAT_RLIM_INFINITY) 364 r.rlim_max = COMPAT_RLIM_INFINITY; 365 366 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 367 __put_user(r.rlim_cur, &rlim->rlim_cur) || 368 __put_user(r.rlim_max, &rlim->rlim_max)) 369 return -EFAULT; 370 } 371 return ret; 372 } 373 374 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 375 { 376 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 377 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 378 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 379 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 380 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 381 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 382 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 383 __put_user(r->ru_idrss, &ru->ru_idrss) || 384 __put_user(r->ru_isrss, &ru->ru_isrss) || 385 __put_user(r->ru_minflt, &ru->ru_minflt) || 386 __put_user(r->ru_majflt, &ru->ru_majflt) || 387 __put_user(r->ru_nswap, &ru->ru_nswap) || 388 __put_user(r->ru_inblock, &ru->ru_inblock) || 389 __put_user(r->ru_oublock, &ru->ru_oublock) || 390 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 391 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 392 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 393 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 394 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 395 return -EFAULT; 396 return 0; 397 } 398 399 COMPAT_SYSCALL_DEFINE4(wait4, 400 compat_pid_t, pid, 401 compat_uint_t __user *, stat_addr, 402 int, options, 403 struct compat_rusage __user *, ru) 404 { 405 if (!ru) { 406 return sys_wait4(pid, stat_addr, options, NULL); 407 } else { 408 struct rusage r; 409 int ret; 410 unsigned int status; 411 mm_segment_t old_fs = get_fs(); 412 413 set_fs (KERNEL_DS); 414 ret = sys_wait4(pid, 415 (stat_addr ? 416 (unsigned int __user *) &status : NULL), 417 options, (struct rusage __user *) &r); 418 set_fs (old_fs); 419 420 if (ret > 0) { 421 if (put_compat_rusage(&r, ru)) 422 return -EFAULT; 423 if (stat_addr && put_user(status, stat_addr)) 424 return -EFAULT; 425 } 426 return ret; 427 } 428 } 429 430 COMPAT_SYSCALL_DEFINE5(waitid, 431 int, which, compat_pid_t, pid, 432 struct compat_siginfo __user *, uinfo, int, options, 433 struct compat_rusage __user *, uru) 434 { 435 siginfo_t info; 436 struct rusage ru; 437 long ret; 438 mm_segment_t old_fs = get_fs(); 439 440 memset(&info, 0, sizeof(info)); 441 442 set_fs(KERNEL_DS); 443 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 444 uru ? (struct rusage __user *)&ru : NULL); 445 set_fs(old_fs); 446 447 if ((ret < 0) || (info.si_signo == 0)) 448 return ret; 449 450 if (uru) { 451 /* sys_waitid() overwrites everything in ru */ 452 if (COMPAT_USE_64BIT_TIME) 453 ret = copy_to_user(uru, &ru, sizeof(ru)); 454 else 455 ret = put_compat_rusage(&ru, uru); 456 if (ret) 457 return -EFAULT; 458 } 459 460 BUG_ON(info.si_code & __SI_MASK); 461 info.si_code |= __SI_CHLD; 462 return copy_siginfo_to_user32(uinfo, &info); 463 } 464 465 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 466 unsigned len, struct cpumask *new_mask) 467 { 468 unsigned long *k; 469 470 if (len < cpumask_size()) 471 memset(new_mask, 0, cpumask_size()); 472 else if (len > cpumask_size()) 473 len = cpumask_size(); 474 475 k = cpumask_bits(new_mask); 476 return compat_get_bitmap(k, user_mask_ptr, len * 8); 477 } 478 479 COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid, 480 unsigned int, len, 481 compat_ulong_t __user *, user_mask_ptr) 482 { 483 cpumask_var_t new_mask; 484 int retval; 485 486 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 487 return -ENOMEM; 488 489 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 490 if (retval) 491 goto out; 492 493 retval = sched_setaffinity(pid, new_mask); 494 out: 495 free_cpumask_var(new_mask); 496 return retval; 497 } 498 499 COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len, 500 compat_ulong_t __user *, user_mask_ptr) 501 { 502 int ret; 503 cpumask_var_t mask; 504 505 if ((len * BITS_PER_BYTE) < nr_cpu_ids) 506 return -EINVAL; 507 if (len & (sizeof(compat_ulong_t)-1)) 508 return -EINVAL; 509 510 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 511 return -ENOMEM; 512 513 ret = sched_getaffinity(pid, mask); 514 if (ret == 0) { 515 size_t retlen = min_t(size_t, len, cpumask_size()); 516 517 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) 518 ret = -EFAULT; 519 else 520 ret = retlen; 521 } 522 free_cpumask_var(mask); 523 524 return ret; 525 } 526 527 int get_compat_itimerspec(struct itimerspec *dst, 528 const struct compat_itimerspec __user *src) 529 { 530 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) || 531 __compat_get_timespec(&dst->it_value, &src->it_value)) 532 return -EFAULT; 533 return 0; 534 } 535 536 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 537 const struct itimerspec *src) 538 { 539 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) || 540 __compat_put_timespec(&src->it_value, &dst->it_value)) 541 return -EFAULT; 542 return 0; 543 } 544 545 /* 546 * We currently only need the following fields from the sigevent 547 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 548 * sigev_notify_thread_id). The others are handled in user mode. 549 * We also assume that copying sigev_value.sival_int is sufficient 550 * to keep all the bits of sigev_value.sival_ptr intact. 551 */ 552 int get_compat_sigevent(struct sigevent *event, 553 const struct compat_sigevent __user *u_event) 554 { 555 memset(event, 0, sizeof(*event)); 556 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 557 __get_user(event->sigev_value.sival_int, 558 &u_event->sigev_value.sival_int) || 559 __get_user(event->sigev_signo, &u_event->sigev_signo) || 560 __get_user(event->sigev_notify, &u_event->sigev_notify) || 561 __get_user(event->sigev_notify_thread_id, 562 &u_event->sigev_notify_thread_id)) 563 ? -EFAULT : 0; 564 } 565 566 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 567 unsigned long bitmap_size) 568 { 569 int i, j; 570 unsigned long m; 571 compat_ulong_t um; 572 unsigned long nr_compat_longs; 573 574 /* align bitmap up to nearest compat_long_t boundary */ 575 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 576 577 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 578 return -EFAULT; 579 580 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 581 582 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 583 m = 0; 584 585 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 586 /* 587 * We dont want to read past the end of the userspace 588 * bitmap. We must however ensure the end of the 589 * kernel bitmap is zeroed. 590 */ 591 if (nr_compat_longs) { 592 nr_compat_longs--; 593 if (__get_user(um, umask)) 594 return -EFAULT; 595 } else { 596 um = 0; 597 } 598 599 umask++; 600 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 601 } 602 *mask++ = m; 603 } 604 605 return 0; 606 } 607 608 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 609 unsigned long bitmap_size) 610 { 611 int i, j; 612 unsigned long m; 613 compat_ulong_t um; 614 unsigned long nr_compat_longs; 615 616 /* align bitmap up to nearest compat_long_t boundary */ 617 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 618 619 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 620 return -EFAULT; 621 622 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 623 624 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 625 m = *mask++; 626 627 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 628 um = m; 629 630 /* 631 * We dont want to write past the end of the userspace 632 * bitmap. 633 */ 634 if (nr_compat_longs) { 635 nr_compat_longs--; 636 if (__put_user(um, umask)) 637 return -EFAULT; 638 } 639 640 umask++; 641 m >>= 4*sizeof(um); 642 m >>= 4*sizeof(um); 643 } 644 } 645 646 return 0; 647 } 648 649 void 650 sigset_from_compat(sigset_t *set, const compat_sigset_t *compat) 651 { 652 switch (_NSIG_WORDS) { 653 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 654 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 655 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 656 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 657 } 658 } 659 EXPORT_SYMBOL_GPL(sigset_from_compat); 660 661 void 662 sigset_to_compat(compat_sigset_t *compat, const sigset_t *set) 663 { 664 switch (_NSIG_WORDS) { 665 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3]; 666 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2]; 667 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1]; 668 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0]; 669 } 670 } 671 672 COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese, 673 struct compat_siginfo __user *, uinfo, 674 struct compat_timespec __user *, uts, compat_size_t, sigsetsize) 675 { 676 compat_sigset_t s32; 677 sigset_t s; 678 struct timespec t; 679 siginfo_t info; 680 long ret; 681 682 if (sigsetsize != sizeof(sigset_t)) 683 return -EINVAL; 684 685 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 686 return -EFAULT; 687 sigset_from_compat(&s, &s32); 688 689 if (uts) { 690 if (compat_get_timespec(&t, uts)) 691 return -EFAULT; 692 } 693 694 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL); 695 696 if (ret > 0 && uinfo) { 697 if (copy_siginfo_to_user32(uinfo, &info)) 698 ret = -EFAULT; 699 } 700 701 return ret; 702 } 703 704 #ifdef CONFIG_NUMA 705 COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages, 706 compat_uptr_t __user *, pages32, 707 const int __user *, nodes, 708 int __user *, status, 709 int, flags) 710 { 711 const void __user * __user *pages; 712 int i; 713 714 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 715 for (i = 0; i < nr_pages; i++) { 716 compat_uptr_t p; 717 718 if (get_user(p, pages32 + i) || 719 put_user(compat_ptr(p), pages + i)) 720 return -EFAULT; 721 } 722 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 723 } 724 725 COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid, 726 compat_ulong_t, maxnode, 727 const compat_ulong_t __user *, old_nodes, 728 const compat_ulong_t __user *, new_nodes) 729 { 730 unsigned long __user *old = NULL; 731 unsigned long __user *new = NULL; 732 nodemask_t tmp_mask; 733 unsigned long nr_bits; 734 unsigned long size; 735 736 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 737 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 738 if (old_nodes) { 739 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 740 return -EFAULT; 741 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 742 if (new_nodes) 743 new = old + size / sizeof(unsigned long); 744 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 745 return -EFAULT; 746 } 747 if (new_nodes) { 748 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 749 return -EFAULT; 750 if (new == NULL) 751 new = compat_alloc_user_space(size); 752 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 753 return -EFAULT; 754 } 755 return sys_migrate_pages(pid, nr_bits + 1, old, new); 756 } 757 #endif 758 759 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval, 760 compat_pid_t, pid, 761 struct compat_timespec __user *, interval) 762 { 763 struct timespec t; 764 int ret; 765 mm_segment_t old_fs = get_fs(); 766 767 set_fs(KERNEL_DS); 768 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); 769 set_fs(old_fs); 770 if (compat_put_timespec(&t, interval)) 771 return -EFAULT; 772 return ret; 773 } 774 775 /* 776 * Allocate user-space memory for the duration of a single system call, 777 * in order to marshall parameters inside a compat thunk. 778 */ 779 void __user *compat_alloc_user_space(unsigned long len) 780 { 781 void __user *ptr; 782 783 /* If len would occupy more than half of the entire compat space... */ 784 if (unlikely(len > (((compat_uptr_t)~0) >> 1))) 785 return NULL; 786 787 ptr = arch_compat_alloc_user_space(len); 788 789 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) 790 return NULL; 791 792 return ptr; 793 } 794 EXPORT_SYMBOL_GPL(compat_alloc_user_space); 795