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 static int __compat_get_timespec64(struct timespec64 *ts64, 124 const struct compat_timespec __user *cts) 125 { 126 struct compat_timespec ts; 127 int ret; 128 129 ret = copy_from_user(&ts, cts, sizeof(ts)); 130 if (ret) 131 return -EFAULT; 132 133 ts64->tv_sec = ts.tv_sec; 134 ts64->tv_nsec = ts.tv_nsec; 135 136 return 0; 137 } 138 139 static int __compat_put_timespec64(const struct timespec64 *ts64, 140 struct compat_timespec __user *cts) 141 { 142 struct compat_timespec ts = { 143 .tv_sec = ts64->tv_sec, 144 .tv_nsec = ts64->tv_nsec 145 }; 146 return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0; 147 } 148 149 int compat_get_timespec64(struct timespec64 *ts, const void __user *uts) 150 { 151 if (COMPAT_USE_64BIT_TIME) 152 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0; 153 else 154 return __compat_get_timespec64(ts, uts); 155 } 156 EXPORT_SYMBOL_GPL(compat_get_timespec64); 157 158 int compat_put_timespec64(const struct timespec64 *ts, void __user *uts) 159 { 160 if (COMPAT_USE_64BIT_TIME) 161 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0; 162 else 163 return __compat_put_timespec64(ts, uts); 164 } 165 EXPORT_SYMBOL_GPL(compat_put_timespec64); 166 167 int compat_get_timeval(struct timeval *tv, const void __user *utv) 168 { 169 if (COMPAT_USE_64BIT_TIME) 170 return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0; 171 else 172 return __compat_get_timeval(tv, utv); 173 } 174 EXPORT_SYMBOL_GPL(compat_get_timeval); 175 176 int compat_put_timeval(const struct timeval *tv, void __user *utv) 177 { 178 if (COMPAT_USE_64BIT_TIME) 179 return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0; 180 else 181 return __compat_put_timeval(tv, utv); 182 } 183 EXPORT_SYMBOL_GPL(compat_put_timeval); 184 185 int compat_get_timespec(struct timespec *ts, const void __user *uts) 186 { 187 if (COMPAT_USE_64BIT_TIME) 188 return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0; 189 else 190 return __compat_get_timespec(ts, uts); 191 } 192 EXPORT_SYMBOL_GPL(compat_get_timespec); 193 194 int compat_put_timespec(const struct timespec *ts, void __user *uts) 195 { 196 if (COMPAT_USE_64BIT_TIME) 197 return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0; 198 else 199 return __compat_put_timespec(ts, uts); 200 } 201 EXPORT_SYMBOL_GPL(compat_put_timespec); 202 203 int compat_convert_timespec(struct timespec __user **kts, 204 const void __user *cts) 205 { 206 struct timespec ts; 207 struct timespec __user *uts; 208 209 if (!cts || COMPAT_USE_64BIT_TIME) { 210 *kts = (struct timespec __user *)cts; 211 return 0; 212 } 213 214 uts = compat_alloc_user_space(sizeof(ts)); 215 if (!uts) 216 return -EFAULT; 217 if (compat_get_timespec(&ts, cts)) 218 return -EFAULT; 219 if (copy_to_user(uts, &ts, sizeof(ts))) 220 return -EFAULT; 221 222 *kts = uts; 223 return 0; 224 } 225 226 int get_compat_itimerval(struct itimerval *o, const struct compat_itimerval __user *i) 227 { 228 struct compat_itimerval v32; 229 230 if (copy_from_user(&v32, i, sizeof(struct compat_itimerval))) 231 return -EFAULT; 232 o->it_interval.tv_sec = v32.it_interval.tv_sec; 233 o->it_interval.tv_usec = v32.it_interval.tv_usec; 234 o->it_value.tv_sec = v32.it_value.tv_sec; 235 o->it_value.tv_usec = v32.it_value.tv_usec; 236 return 0; 237 } 238 239 int put_compat_itimerval(struct compat_itimerval __user *o, const struct itimerval *i) 240 { 241 struct compat_itimerval v32; 242 243 v32.it_interval.tv_sec = i->it_interval.tv_sec; 244 v32.it_interval.tv_usec = i->it_interval.tv_usec; 245 v32.it_value.tv_sec = i->it_value.tv_sec; 246 v32.it_value.tv_usec = i->it_value.tv_usec; 247 return copy_to_user(o, &v32, sizeof(struct compat_itimerval)) ? -EFAULT : 0; 248 } 249 250 static compat_clock_t clock_t_to_compat_clock_t(clock_t x) 251 { 252 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); 253 } 254 255 COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf) 256 { 257 if (tbuf) { 258 struct tms tms; 259 struct compat_tms tmp; 260 261 do_sys_times(&tms); 262 /* Convert our struct tms to the compat version. */ 263 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); 264 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); 265 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); 266 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); 267 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 268 return -EFAULT; 269 } 270 force_successful_syscall_return(); 271 return compat_jiffies_to_clock_t(jiffies); 272 } 273 274 #ifdef __ARCH_WANT_SYS_SIGPENDING 275 276 /* 277 * Assumption: old_sigset_t and compat_old_sigset_t are both 278 * types that can be passed to put_user()/get_user(). 279 */ 280 281 COMPAT_SYSCALL_DEFINE1(sigpending, compat_old_sigset_t __user *, set) 282 { 283 old_sigset_t s; 284 long ret; 285 mm_segment_t old_fs = get_fs(); 286 287 set_fs(KERNEL_DS); 288 ret = sys_sigpending((old_sigset_t __user *) &s); 289 set_fs(old_fs); 290 if (ret == 0) 291 ret = put_user(s, set); 292 return ret; 293 } 294 295 #endif 296 297 #ifdef __ARCH_WANT_SYS_SIGPROCMASK 298 299 /* 300 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the 301 * blocked set of signals to the supplied signal set 302 */ 303 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set) 304 { 305 memcpy(blocked->sig, &set, sizeof(set)); 306 } 307 308 COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how, 309 compat_old_sigset_t __user *, nset, 310 compat_old_sigset_t __user *, oset) 311 { 312 old_sigset_t old_set, new_set; 313 sigset_t new_blocked; 314 315 old_set = current->blocked.sig[0]; 316 317 if (nset) { 318 if (get_user(new_set, nset)) 319 return -EFAULT; 320 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP)); 321 322 new_blocked = current->blocked; 323 324 switch (how) { 325 case SIG_BLOCK: 326 sigaddsetmask(&new_blocked, new_set); 327 break; 328 case SIG_UNBLOCK: 329 sigdelsetmask(&new_blocked, new_set); 330 break; 331 case SIG_SETMASK: 332 compat_sig_setmask(&new_blocked, new_set); 333 break; 334 default: 335 return -EINVAL; 336 } 337 338 set_current_blocked(&new_blocked); 339 } 340 341 if (oset) { 342 if (put_user(old_set, oset)) 343 return -EFAULT; 344 } 345 346 return 0; 347 } 348 349 #endif 350 351 COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource, 352 struct compat_rlimit __user *, rlim) 353 { 354 struct rlimit r; 355 356 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 357 __get_user(r.rlim_cur, &rlim->rlim_cur) || 358 __get_user(r.rlim_max, &rlim->rlim_max)) 359 return -EFAULT; 360 361 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 362 r.rlim_cur = RLIM_INFINITY; 363 if (r.rlim_max == COMPAT_RLIM_INFINITY) 364 r.rlim_max = RLIM_INFINITY; 365 return do_prlimit(current, resource, &r, NULL); 366 } 367 368 #ifdef COMPAT_RLIM_OLD_INFINITY 369 370 COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, 371 struct compat_rlimit __user *, rlim) 372 { 373 struct rlimit r; 374 int ret; 375 mm_segment_t old_fs = get_fs(); 376 377 set_fs(KERNEL_DS); 378 ret = sys_old_getrlimit(resource, (struct rlimit __user *)&r); 379 set_fs(old_fs); 380 381 if (!ret) { 382 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 383 r.rlim_cur = COMPAT_RLIM_INFINITY; 384 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 385 r.rlim_max = COMPAT_RLIM_INFINITY; 386 387 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 388 __put_user(r.rlim_cur, &rlim->rlim_cur) || 389 __put_user(r.rlim_max, &rlim->rlim_max)) 390 return -EFAULT; 391 } 392 return ret; 393 } 394 395 #endif 396 397 COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource, 398 struct compat_rlimit __user *, rlim) 399 { 400 struct rlimit r; 401 int ret; 402 403 ret = do_prlimit(current, resource, NULL, &r); 404 if (!ret) { 405 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 406 r.rlim_cur = COMPAT_RLIM_INFINITY; 407 if (r.rlim_max > COMPAT_RLIM_INFINITY) 408 r.rlim_max = COMPAT_RLIM_INFINITY; 409 410 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 411 __put_user(r.rlim_cur, &rlim->rlim_cur) || 412 __put_user(r.rlim_max, &rlim->rlim_max)) 413 return -EFAULT; 414 } 415 return ret; 416 } 417 418 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 419 { 420 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 421 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 422 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 423 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 424 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 425 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 426 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 427 __put_user(r->ru_idrss, &ru->ru_idrss) || 428 __put_user(r->ru_isrss, &ru->ru_isrss) || 429 __put_user(r->ru_minflt, &ru->ru_minflt) || 430 __put_user(r->ru_majflt, &ru->ru_majflt) || 431 __put_user(r->ru_nswap, &ru->ru_nswap) || 432 __put_user(r->ru_inblock, &ru->ru_inblock) || 433 __put_user(r->ru_oublock, &ru->ru_oublock) || 434 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 435 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 436 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 437 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 438 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 439 return -EFAULT; 440 return 0; 441 } 442 443 COMPAT_SYSCALL_DEFINE4(wait4, 444 compat_pid_t, pid, 445 compat_uint_t __user *, stat_addr, 446 int, options, 447 struct compat_rusage __user *, ru) 448 { 449 if (!ru) { 450 return sys_wait4(pid, stat_addr, options, NULL); 451 } else { 452 struct rusage r; 453 int ret; 454 unsigned int status; 455 mm_segment_t old_fs = get_fs(); 456 457 set_fs (KERNEL_DS); 458 ret = sys_wait4(pid, 459 (stat_addr ? 460 (unsigned int __user *) &status : NULL), 461 options, (struct rusage __user *) &r); 462 set_fs (old_fs); 463 464 if (ret > 0) { 465 if (put_compat_rusage(&r, ru)) 466 return -EFAULT; 467 if (stat_addr && put_user(status, stat_addr)) 468 return -EFAULT; 469 } 470 return ret; 471 } 472 } 473 474 COMPAT_SYSCALL_DEFINE5(waitid, 475 int, which, compat_pid_t, pid, 476 struct compat_siginfo __user *, uinfo, int, options, 477 struct compat_rusage __user *, uru) 478 { 479 siginfo_t info; 480 struct rusage ru; 481 long ret; 482 mm_segment_t old_fs = get_fs(); 483 484 memset(&info, 0, sizeof(info)); 485 486 set_fs(KERNEL_DS); 487 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 488 uru ? (struct rusage __user *)&ru : NULL); 489 set_fs(old_fs); 490 491 if ((ret < 0) || (info.si_signo == 0)) 492 return ret; 493 494 if (uru) { 495 /* sys_waitid() overwrites everything in ru */ 496 if (COMPAT_USE_64BIT_TIME) 497 ret = copy_to_user(uru, &ru, sizeof(ru)); 498 else 499 ret = put_compat_rusage(&ru, uru); 500 if (ret) 501 return -EFAULT; 502 } 503 504 BUG_ON(info.si_code & __SI_MASK); 505 info.si_code |= __SI_CHLD; 506 return copy_siginfo_to_user32(uinfo, &info); 507 } 508 509 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 510 unsigned len, struct cpumask *new_mask) 511 { 512 unsigned long *k; 513 514 if (len < cpumask_size()) 515 memset(new_mask, 0, cpumask_size()); 516 else if (len > cpumask_size()) 517 len = cpumask_size(); 518 519 k = cpumask_bits(new_mask); 520 return compat_get_bitmap(k, user_mask_ptr, len * 8); 521 } 522 523 COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid, 524 unsigned int, len, 525 compat_ulong_t __user *, user_mask_ptr) 526 { 527 cpumask_var_t new_mask; 528 int retval; 529 530 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 531 return -ENOMEM; 532 533 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 534 if (retval) 535 goto out; 536 537 retval = sched_setaffinity(pid, new_mask); 538 out: 539 free_cpumask_var(new_mask); 540 return retval; 541 } 542 543 COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len, 544 compat_ulong_t __user *, user_mask_ptr) 545 { 546 int ret; 547 cpumask_var_t mask; 548 549 if ((len * BITS_PER_BYTE) < nr_cpu_ids) 550 return -EINVAL; 551 if (len & (sizeof(compat_ulong_t)-1)) 552 return -EINVAL; 553 554 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 555 return -ENOMEM; 556 557 ret = sched_getaffinity(pid, mask); 558 if (ret == 0) { 559 size_t retlen = min_t(size_t, len, cpumask_size()); 560 561 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) 562 ret = -EFAULT; 563 else 564 ret = retlen; 565 } 566 free_cpumask_var(mask); 567 568 return ret; 569 } 570 571 int get_compat_itimerspec(struct itimerspec *dst, 572 const struct compat_itimerspec __user *src) 573 { 574 if (__compat_get_timespec(&dst->it_interval, &src->it_interval) || 575 __compat_get_timespec(&dst->it_value, &src->it_value)) 576 return -EFAULT; 577 return 0; 578 } 579 580 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 581 const struct itimerspec *src) 582 { 583 if (__compat_put_timespec(&src->it_interval, &dst->it_interval) || 584 __compat_put_timespec(&src->it_value, &dst->it_value)) 585 return -EFAULT; 586 return 0; 587 } 588 589 int get_compat_itimerspec64(struct itimerspec64 *its, 590 const struct compat_itimerspec __user *uits) 591 { 592 593 if (__compat_get_timespec64(&its->it_interval, &uits->it_interval) || 594 __compat_get_timespec64(&its->it_value, &uits->it_value)) 595 return -EFAULT; 596 return 0; 597 } 598 EXPORT_SYMBOL_GPL(get_compat_itimerspec64); 599 600 int put_compat_itimerspec64(const struct itimerspec64 *its, 601 struct compat_itimerspec __user *uits) 602 { 603 if (__compat_put_timespec64(&its->it_interval, &uits->it_interval) || 604 __compat_put_timespec64(&its->it_value, &uits->it_value)) 605 return -EFAULT; 606 return 0; 607 } 608 EXPORT_SYMBOL_GPL(put_compat_itimerspec64); 609 610 /* 611 * We currently only need the following fields from the sigevent 612 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 613 * sigev_notify_thread_id). The others are handled in user mode. 614 * We also assume that copying sigev_value.sival_int is sufficient 615 * to keep all the bits of sigev_value.sival_ptr intact. 616 */ 617 int get_compat_sigevent(struct sigevent *event, 618 const struct compat_sigevent __user *u_event) 619 { 620 memset(event, 0, sizeof(*event)); 621 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 622 __get_user(event->sigev_value.sival_int, 623 &u_event->sigev_value.sival_int) || 624 __get_user(event->sigev_signo, &u_event->sigev_signo) || 625 __get_user(event->sigev_notify, &u_event->sigev_notify) || 626 __get_user(event->sigev_notify_thread_id, 627 &u_event->sigev_notify_thread_id)) 628 ? -EFAULT : 0; 629 } 630 631 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 632 unsigned long bitmap_size) 633 { 634 int i, j; 635 unsigned long m; 636 compat_ulong_t um; 637 unsigned long nr_compat_longs; 638 639 /* align bitmap up to nearest compat_long_t boundary */ 640 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 641 642 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 643 return -EFAULT; 644 645 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 646 647 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 648 m = 0; 649 650 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 651 /* 652 * We dont want to read past the end of the userspace 653 * bitmap. We must however ensure the end of the 654 * kernel bitmap is zeroed. 655 */ 656 if (nr_compat_longs) { 657 nr_compat_longs--; 658 if (__get_user(um, umask)) 659 return -EFAULT; 660 } else { 661 um = 0; 662 } 663 664 umask++; 665 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 666 } 667 *mask++ = m; 668 } 669 670 return 0; 671 } 672 673 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 674 unsigned long bitmap_size) 675 { 676 int i, j; 677 unsigned long m; 678 compat_ulong_t um; 679 unsigned long nr_compat_longs; 680 681 /* align bitmap up to nearest compat_long_t boundary */ 682 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 683 684 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 685 return -EFAULT; 686 687 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 688 689 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 690 m = *mask++; 691 692 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 693 um = m; 694 695 /* 696 * We dont want to write past the end of the userspace 697 * bitmap. 698 */ 699 if (nr_compat_longs) { 700 nr_compat_longs--; 701 if (__put_user(um, umask)) 702 return -EFAULT; 703 } 704 705 umask++; 706 m >>= 4*sizeof(um); 707 m >>= 4*sizeof(um); 708 } 709 } 710 711 return 0; 712 } 713 714 void 715 sigset_from_compat(sigset_t *set, const compat_sigset_t *compat) 716 { 717 switch (_NSIG_WORDS) { 718 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 719 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 720 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 721 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 722 } 723 } 724 EXPORT_SYMBOL_GPL(sigset_from_compat); 725 726 void 727 sigset_to_compat(compat_sigset_t *compat, const sigset_t *set) 728 { 729 switch (_NSIG_WORDS) { 730 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3]; 731 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2]; 732 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1]; 733 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0]; 734 } 735 } 736 737 COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese, 738 struct compat_siginfo __user *, uinfo, 739 struct compat_timespec __user *, uts, compat_size_t, sigsetsize) 740 { 741 compat_sigset_t s32; 742 sigset_t s; 743 struct timespec t; 744 siginfo_t info; 745 long ret; 746 747 if (sigsetsize != sizeof(sigset_t)) 748 return -EINVAL; 749 750 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 751 return -EFAULT; 752 sigset_from_compat(&s, &s32); 753 754 if (uts) { 755 if (compat_get_timespec(&t, uts)) 756 return -EFAULT; 757 } 758 759 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL); 760 761 if (ret > 0 && uinfo) { 762 if (copy_siginfo_to_user32(uinfo, &info)) 763 ret = -EFAULT; 764 } 765 766 return ret; 767 } 768 769 #ifdef CONFIG_NUMA 770 COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages, 771 compat_uptr_t __user *, pages32, 772 const int __user *, nodes, 773 int __user *, status, 774 int, flags) 775 { 776 const void __user * __user *pages; 777 int i; 778 779 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 780 for (i = 0; i < nr_pages; i++) { 781 compat_uptr_t p; 782 783 if (get_user(p, pages32 + i) || 784 put_user(compat_ptr(p), pages + i)) 785 return -EFAULT; 786 } 787 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 788 } 789 790 COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid, 791 compat_ulong_t, maxnode, 792 const compat_ulong_t __user *, old_nodes, 793 const compat_ulong_t __user *, new_nodes) 794 { 795 unsigned long __user *old = NULL; 796 unsigned long __user *new = NULL; 797 nodemask_t tmp_mask; 798 unsigned long nr_bits; 799 unsigned long size; 800 801 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 802 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 803 if (old_nodes) { 804 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 805 return -EFAULT; 806 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 807 if (new_nodes) 808 new = old + size / sizeof(unsigned long); 809 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 810 return -EFAULT; 811 } 812 if (new_nodes) { 813 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 814 return -EFAULT; 815 if (new == NULL) 816 new = compat_alloc_user_space(size); 817 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 818 return -EFAULT; 819 } 820 return sys_migrate_pages(pid, nr_bits + 1, old, new); 821 } 822 #endif 823 824 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval, 825 compat_pid_t, pid, 826 struct compat_timespec __user *, interval) 827 { 828 struct timespec t; 829 int ret; 830 mm_segment_t old_fs = get_fs(); 831 832 set_fs(KERNEL_DS); 833 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); 834 set_fs(old_fs); 835 if (compat_put_timespec(&t, interval)) 836 return -EFAULT; 837 return ret; 838 } 839 840 /* 841 * Allocate user-space memory for the duration of a single system call, 842 * in order to marshall parameters inside a compat thunk. 843 */ 844 void __user *compat_alloc_user_space(unsigned long len) 845 { 846 void __user *ptr; 847 848 /* If len would occupy more than half of the entire compat space... */ 849 if (unlikely(len > (((compat_uptr_t)~0) >> 1))) 850 return NULL; 851 852 ptr = arch_compat_alloc_user_space(len); 853 854 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) 855 return NULL; 856 857 return ptr; 858 } 859 EXPORT_SYMBOL_GPL(compat_alloc_user_space); 860