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 <asm/uaccess.h> 32 33 /* 34 * Get/set struct timeval with struct timespec on the native side 35 */ 36 static int compat_get_timeval_convert(struct timespec *o, 37 struct compat_timeval __user *i) 38 { 39 long usec; 40 41 if (get_user(o->tv_sec, &i->tv_sec) || 42 get_user(usec, &i->tv_usec)) 43 return -EFAULT; 44 o->tv_nsec = usec * 1000; 45 return 0; 46 } 47 48 static int compat_put_timeval_convert(struct compat_timeval __user *o, 49 struct timeval *i) 50 { 51 return (put_user(i->tv_sec, &o->tv_sec) || 52 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0; 53 } 54 55 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp) 56 { 57 memset(txc, 0, sizeof(struct timex)); 58 59 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || 60 __get_user(txc->modes, &utp->modes) || 61 __get_user(txc->offset, &utp->offset) || 62 __get_user(txc->freq, &utp->freq) || 63 __get_user(txc->maxerror, &utp->maxerror) || 64 __get_user(txc->esterror, &utp->esterror) || 65 __get_user(txc->status, &utp->status) || 66 __get_user(txc->constant, &utp->constant) || 67 __get_user(txc->precision, &utp->precision) || 68 __get_user(txc->tolerance, &utp->tolerance) || 69 __get_user(txc->time.tv_sec, &utp->time.tv_sec) || 70 __get_user(txc->time.tv_usec, &utp->time.tv_usec) || 71 __get_user(txc->tick, &utp->tick) || 72 __get_user(txc->ppsfreq, &utp->ppsfreq) || 73 __get_user(txc->jitter, &utp->jitter) || 74 __get_user(txc->shift, &utp->shift) || 75 __get_user(txc->stabil, &utp->stabil) || 76 __get_user(txc->jitcnt, &utp->jitcnt) || 77 __get_user(txc->calcnt, &utp->calcnt) || 78 __get_user(txc->errcnt, &utp->errcnt) || 79 __get_user(txc->stbcnt, &utp->stbcnt)) 80 return -EFAULT; 81 82 return 0; 83 } 84 85 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc) 86 { 87 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || 88 __put_user(txc->modes, &utp->modes) || 89 __put_user(txc->offset, &utp->offset) || 90 __put_user(txc->freq, &utp->freq) || 91 __put_user(txc->maxerror, &utp->maxerror) || 92 __put_user(txc->esterror, &utp->esterror) || 93 __put_user(txc->status, &utp->status) || 94 __put_user(txc->constant, &utp->constant) || 95 __put_user(txc->precision, &utp->precision) || 96 __put_user(txc->tolerance, &utp->tolerance) || 97 __put_user(txc->time.tv_sec, &utp->time.tv_sec) || 98 __put_user(txc->time.tv_usec, &utp->time.tv_usec) || 99 __put_user(txc->tick, &utp->tick) || 100 __put_user(txc->ppsfreq, &utp->ppsfreq) || 101 __put_user(txc->jitter, &utp->jitter) || 102 __put_user(txc->shift, &utp->shift) || 103 __put_user(txc->stabil, &utp->stabil) || 104 __put_user(txc->jitcnt, &utp->jitcnt) || 105 __put_user(txc->calcnt, &utp->calcnt) || 106 __put_user(txc->errcnt, &utp->errcnt) || 107 __put_user(txc->stbcnt, &utp->stbcnt) || 108 __put_user(txc->tai, &utp->tai)) 109 return -EFAULT; 110 return 0; 111 } 112 113 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv, 114 struct timezone __user *tz) 115 { 116 if (tv) { 117 struct timeval ktv; 118 do_gettimeofday(&ktv); 119 if (compat_put_timeval_convert(tv, &ktv)) 120 return -EFAULT; 121 } 122 if (tz) { 123 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) 124 return -EFAULT; 125 } 126 127 return 0; 128 } 129 130 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv, 131 struct timezone __user *tz) 132 { 133 struct timespec kts; 134 struct timezone ktz; 135 136 if (tv) { 137 if (compat_get_timeval_convert(&kts, tv)) 138 return -EFAULT; 139 } 140 if (tz) { 141 if (copy_from_user(&ktz, tz, sizeof(ktz))) 142 return -EFAULT; 143 } 144 145 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL); 146 } 147 148 int get_compat_timeval(struct timeval *tv, const struct compat_timeval __user *ctv) 149 { 150 return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) || 151 __get_user(tv->tv_sec, &ctv->tv_sec) || 152 __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; 153 } 154 EXPORT_SYMBOL_GPL(get_compat_timeval); 155 156 int put_compat_timeval(const struct timeval *tv, struct compat_timeval __user *ctv) 157 { 158 return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) || 159 __put_user(tv->tv_sec, &ctv->tv_sec) || 160 __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; 161 } 162 EXPORT_SYMBOL_GPL(put_compat_timeval); 163 164 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts) 165 { 166 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || 167 __get_user(ts->tv_sec, &cts->tv_sec) || 168 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 169 } 170 EXPORT_SYMBOL_GPL(get_compat_timespec); 171 172 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts) 173 { 174 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || 175 __put_user(ts->tv_sec, &cts->tv_sec) || 176 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 177 } 178 EXPORT_SYMBOL_GPL(put_compat_timespec); 179 180 int compat_get_timeval(struct timeval *tv, const void __user *utv) 181 { 182 if (COMPAT_USE_64BIT_TIME) 183 return copy_from_user(tv, utv, sizeof *tv) ? -EFAULT : 0; 184 else 185 return get_compat_timeval(tv, utv); 186 } 187 EXPORT_SYMBOL_GPL(compat_get_timeval); 188 189 int compat_put_timeval(const struct timeval *tv, void __user *utv) 190 { 191 if (COMPAT_USE_64BIT_TIME) 192 return copy_to_user(utv, tv, sizeof *tv) ? -EFAULT : 0; 193 else 194 return put_compat_timeval(tv, utv); 195 } 196 EXPORT_SYMBOL_GPL(compat_put_timeval); 197 198 int compat_get_timespec(struct timespec *ts, const void __user *uts) 199 { 200 if (COMPAT_USE_64BIT_TIME) 201 return copy_from_user(ts, uts, sizeof *ts) ? -EFAULT : 0; 202 else 203 return get_compat_timespec(ts, uts); 204 } 205 EXPORT_SYMBOL_GPL(compat_get_timespec); 206 207 int compat_put_timespec(const struct timespec *ts, void __user *uts) 208 { 209 if (COMPAT_USE_64BIT_TIME) 210 return copy_to_user(uts, ts, sizeof *ts) ? -EFAULT : 0; 211 else 212 return put_compat_timespec(ts, uts); 213 } 214 EXPORT_SYMBOL_GPL(compat_put_timespec); 215 216 static long compat_nanosleep_restart(struct restart_block *restart) 217 { 218 struct compat_timespec __user *rmtp; 219 struct timespec rmt; 220 mm_segment_t oldfs; 221 long ret; 222 223 restart->nanosleep.rmtp = (struct timespec __user *) &rmt; 224 oldfs = get_fs(); 225 set_fs(KERNEL_DS); 226 ret = hrtimer_nanosleep_restart(restart); 227 set_fs(oldfs); 228 229 if (ret) { 230 rmtp = restart->nanosleep.compat_rmtp; 231 232 if (rmtp && put_compat_timespec(&rmt, rmtp)) 233 return -EFAULT; 234 } 235 236 return ret; 237 } 238 239 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, 240 struct compat_timespec __user *rmtp) 241 { 242 struct timespec tu, rmt; 243 mm_segment_t oldfs; 244 long ret; 245 246 if (get_compat_timespec(&tu, rqtp)) 247 return -EFAULT; 248 249 if (!timespec_valid(&tu)) 250 return -EINVAL; 251 252 oldfs = get_fs(); 253 set_fs(KERNEL_DS); 254 ret = hrtimer_nanosleep(&tu, 255 rmtp ? (struct timespec __user *)&rmt : NULL, 256 HRTIMER_MODE_REL, CLOCK_MONOTONIC); 257 set_fs(oldfs); 258 259 if (ret) { 260 struct restart_block *restart 261 = ¤t_thread_info()->restart_block; 262 263 restart->fn = compat_nanosleep_restart; 264 restart->nanosleep.compat_rmtp = rmtp; 265 266 if (rmtp && put_compat_timespec(&rmt, rmtp)) 267 return -EFAULT; 268 } 269 270 return ret; 271 } 272 273 static inline long get_compat_itimerval(struct itimerval *o, 274 struct compat_itimerval __user *i) 275 { 276 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 277 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 278 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 279 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 280 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 281 } 282 283 static inline long put_compat_itimerval(struct compat_itimerval __user *o, 284 struct itimerval *i) 285 { 286 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 287 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 288 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 289 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 290 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 291 } 292 293 asmlinkage long compat_sys_getitimer(int which, 294 struct compat_itimerval __user *it) 295 { 296 struct itimerval kit; 297 int error; 298 299 error = do_getitimer(which, &kit); 300 if (!error && put_compat_itimerval(it, &kit)) 301 error = -EFAULT; 302 return error; 303 } 304 305 asmlinkage long compat_sys_setitimer(int which, 306 struct compat_itimerval __user *in, 307 struct compat_itimerval __user *out) 308 { 309 struct itimerval kin, kout; 310 int error; 311 312 if (in) { 313 if (get_compat_itimerval(&kin, in)) 314 return -EFAULT; 315 } else 316 memset(&kin, 0, sizeof(kin)); 317 318 error = do_setitimer(which, &kin, out ? &kout : NULL); 319 if (error || !out) 320 return error; 321 if (put_compat_itimerval(out, &kout)) 322 return -EFAULT; 323 return 0; 324 } 325 326 static compat_clock_t clock_t_to_compat_clock_t(clock_t x) 327 { 328 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); 329 } 330 331 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) 332 { 333 if (tbuf) { 334 struct tms tms; 335 struct compat_tms tmp; 336 337 do_sys_times(&tms); 338 /* Convert our struct tms to the compat version. */ 339 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); 340 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); 341 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); 342 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); 343 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 344 return -EFAULT; 345 } 346 force_successful_syscall_return(); 347 return compat_jiffies_to_clock_t(jiffies); 348 } 349 350 #ifdef __ARCH_WANT_SYS_SIGPENDING 351 352 /* 353 * Assumption: old_sigset_t and compat_old_sigset_t are both 354 * types that can be passed to put_user()/get_user(). 355 */ 356 357 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) 358 { 359 old_sigset_t s; 360 long ret; 361 mm_segment_t old_fs = get_fs(); 362 363 set_fs(KERNEL_DS); 364 ret = sys_sigpending((old_sigset_t __user *) &s); 365 set_fs(old_fs); 366 if (ret == 0) 367 ret = put_user(s, set); 368 return ret; 369 } 370 371 #endif 372 373 #ifdef __ARCH_WANT_SYS_SIGPROCMASK 374 375 /* 376 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the 377 * blocked set of signals to the supplied signal set 378 */ 379 static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set) 380 { 381 memcpy(blocked->sig, &set, sizeof(set)); 382 } 383 384 asmlinkage long compat_sys_sigprocmask(int how, 385 compat_old_sigset_t __user *nset, 386 compat_old_sigset_t __user *oset) 387 { 388 old_sigset_t old_set, new_set; 389 sigset_t new_blocked; 390 391 old_set = current->blocked.sig[0]; 392 393 if (nset) { 394 if (get_user(new_set, nset)) 395 return -EFAULT; 396 new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP)); 397 398 new_blocked = current->blocked; 399 400 switch (how) { 401 case SIG_BLOCK: 402 sigaddsetmask(&new_blocked, new_set); 403 break; 404 case SIG_UNBLOCK: 405 sigdelsetmask(&new_blocked, new_set); 406 break; 407 case SIG_SETMASK: 408 compat_sig_setmask(&new_blocked, new_set); 409 break; 410 default: 411 return -EINVAL; 412 } 413 414 set_current_blocked(&new_blocked); 415 } 416 417 if (oset) { 418 if (put_user(old_set, oset)) 419 return -EFAULT; 420 } 421 422 return 0; 423 } 424 425 #endif 426 427 asmlinkage long compat_sys_setrlimit(unsigned int resource, 428 struct compat_rlimit __user *rlim) 429 { 430 struct rlimit r; 431 432 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 433 __get_user(r.rlim_cur, &rlim->rlim_cur) || 434 __get_user(r.rlim_max, &rlim->rlim_max)) 435 return -EFAULT; 436 437 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 438 r.rlim_cur = RLIM_INFINITY; 439 if (r.rlim_max == COMPAT_RLIM_INFINITY) 440 r.rlim_max = RLIM_INFINITY; 441 return do_prlimit(current, resource, &r, NULL); 442 } 443 444 #ifdef COMPAT_RLIM_OLD_INFINITY 445 446 asmlinkage long compat_sys_old_getrlimit(unsigned int resource, 447 struct compat_rlimit __user *rlim) 448 { 449 struct rlimit r; 450 int ret; 451 mm_segment_t old_fs = get_fs(); 452 453 set_fs(KERNEL_DS); 454 ret = sys_old_getrlimit(resource, &r); 455 set_fs(old_fs); 456 457 if (!ret) { 458 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 459 r.rlim_cur = COMPAT_RLIM_INFINITY; 460 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 461 r.rlim_max = COMPAT_RLIM_INFINITY; 462 463 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 464 __put_user(r.rlim_cur, &rlim->rlim_cur) || 465 __put_user(r.rlim_max, &rlim->rlim_max)) 466 return -EFAULT; 467 } 468 return ret; 469 } 470 471 #endif 472 473 asmlinkage long compat_sys_getrlimit(unsigned int resource, 474 struct compat_rlimit __user *rlim) 475 { 476 struct rlimit r; 477 int ret; 478 479 ret = do_prlimit(current, resource, NULL, &r); 480 if (!ret) { 481 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 482 r.rlim_cur = COMPAT_RLIM_INFINITY; 483 if (r.rlim_max > COMPAT_RLIM_INFINITY) 484 r.rlim_max = COMPAT_RLIM_INFINITY; 485 486 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 487 __put_user(r.rlim_cur, &rlim->rlim_cur) || 488 __put_user(r.rlim_max, &rlim->rlim_max)) 489 return -EFAULT; 490 } 491 return ret; 492 } 493 494 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 495 { 496 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 497 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 498 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 499 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 500 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 501 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 502 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 503 __put_user(r->ru_idrss, &ru->ru_idrss) || 504 __put_user(r->ru_isrss, &ru->ru_isrss) || 505 __put_user(r->ru_minflt, &ru->ru_minflt) || 506 __put_user(r->ru_majflt, &ru->ru_majflt) || 507 __put_user(r->ru_nswap, &ru->ru_nswap) || 508 __put_user(r->ru_inblock, &ru->ru_inblock) || 509 __put_user(r->ru_oublock, &ru->ru_oublock) || 510 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 511 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 512 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 513 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 514 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 515 return -EFAULT; 516 return 0; 517 } 518 519 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) 520 { 521 struct rusage r; 522 int ret; 523 mm_segment_t old_fs = get_fs(); 524 525 set_fs(KERNEL_DS); 526 ret = sys_getrusage(who, (struct rusage __user *) &r); 527 set_fs(old_fs); 528 529 if (ret) 530 return ret; 531 532 if (put_compat_rusage(&r, ru)) 533 return -EFAULT; 534 535 return 0; 536 } 537 538 asmlinkage long 539 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, 540 struct compat_rusage __user *ru) 541 { 542 if (!ru) { 543 return sys_wait4(pid, stat_addr, options, NULL); 544 } else { 545 struct rusage r; 546 int ret; 547 unsigned int status; 548 mm_segment_t old_fs = get_fs(); 549 550 set_fs (KERNEL_DS); 551 ret = sys_wait4(pid, 552 (stat_addr ? 553 (unsigned int __user *) &status : NULL), 554 options, (struct rusage __user *) &r); 555 set_fs (old_fs); 556 557 if (ret > 0) { 558 if (put_compat_rusage(&r, ru)) 559 return -EFAULT; 560 if (stat_addr && put_user(status, stat_addr)) 561 return -EFAULT; 562 } 563 return ret; 564 } 565 } 566 567 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, 568 struct compat_siginfo __user *uinfo, int options, 569 struct compat_rusage __user *uru) 570 { 571 siginfo_t info; 572 struct rusage ru; 573 long ret; 574 mm_segment_t old_fs = get_fs(); 575 576 memset(&info, 0, sizeof(info)); 577 578 set_fs(KERNEL_DS); 579 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 580 uru ? (struct rusage __user *)&ru : NULL); 581 set_fs(old_fs); 582 583 if ((ret < 0) || (info.si_signo == 0)) 584 return ret; 585 586 if (uru) { 587 ret = put_compat_rusage(&ru, uru); 588 if (ret) 589 return ret; 590 } 591 592 BUG_ON(info.si_code & __SI_MASK); 593 info.si_code |= __SI_CHLD; 594 return copy_siginfo_to_user32(uinfo, &info); 595 } 596 597 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 598 unsigned len, struct cpumask *new_mask) 599 { 600 unsigned long *k; 601 602 if (len < cpumask_size()) 603 memset(new_mask, 0, cpumask_size()); 604 else if (len > cpumask_size()) 605 len = cpumask_size(); 606 607 k = cpumask_bits(new_mask); 608 return compat_get_bitmap(k, user_mask_ptr, len * 8); 609 } 610 611 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 612 unsigned int len, 613 compat_ulong_t __user *user_mask_ptr) 614 { 615 cpumask_var_t new_mask; 616 int retval; 617 618 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 619 return -ENOMEM; 620 621 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 622 if (retval) 623 goto out; 624 625 retval = sched_setaffinity(pid, new_mask); 626 out: 627 free_cpumask_var(new_mask); 628 return retval; 629 } 630 631 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 632 compat_ulong_t __user *user_mask_ptr) 633 { 634 int ret; 635 cpumask_var_t mask; 636 637 if ((len * BITS_PER_BYTE) < nr_cpu_ids) 638 return -EINVAL; 639 if (len & (sizeof(compat_ulong_t)-1)) 640 return -EINVAL; 641 642 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 643 return -ENOMEM; 644 645 ret = sched_getaffinity(pid, mask); 646 if (ret == 0) { 647 size_t retlen = min_t(size_t, len, cpumask_size()); 648 649 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) 650 ret = -EFAULT; 651 else 652 ret = retlen; 653 } 654 free_cpumask_var(mask); 655 656 return ret; 657 } 658 659 int get_compat_itimerspec(struct itimerspec *dst, 660 const struct compat_itimerspec __user *src) 661 { 662 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 663 get_compat_timespec(&dst->it_value, &src->it_value)) 664 return -EFAULT; 665 return 0; 666 } 667 668 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 669 const struct itimerspec *src) 670 { 671 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 672 put_compat_timespec(&src->it_value, &dst->it_value)) 673 return -EFAULT; 674 return 0; 675 } 676 677 long compat_sys_timer_create(clockid_t which_clock, 678 struct compat_sigevent __user *timer_event_spec, 679 timer_t __user *created_timer_id) 680 { 681 struct sigevent __user *event = NULL; 682 683 if (timer_event_spec) { 684 struct sigevent kevent; 685 686 event = compat_alloc_user_space(sizeof(*event)); 687 if (get_compat_sigevent(&kevent, timer_event_spec) || 688 copy_to_user(event, &kevent, sizeof(*event))) 689 return -EFAULT; 690 } 691 692 return sys_timer_create(which_clock, event, created_timer_id); 693 } 694 695 long compat_sys_timer_settime(timer_t timer_id, int flags, 696 struct compat_itimerspec __user *new, 697 struct compat_itimerspec __user *old) 698 { 699 long err; 700 mm_segment_t oldfs; 701 struct itimerspec newts, oldts; 702 703 if (!new) 704 return -EINVAL; 705 if (get_compat_itimerspec(&newts, new)) 706 return -EFAULT; 707 oldfs = get_fs(); 708 set_fs(KERNEL_DS); 709 err = sys_timer_settime(timer_id, flags, 710 (struct itimerspec __user *) &newts, 711 (struct itimerspec __user *) &oldts); 712 set_fs(oldfs); 713 if (!err && old && put_compat_itimerspec(old, &oldts)) 714 return -EFAULT; 715 return err; 716 } 717 718 long compat_sys_timer_gettime(timer_t timer_id, 719 struct compat_itimerspec __user *setting) 720 { 721 long err; 722 mm_segment_t oldfs; 723 struct itimerspec ts; 724 725 oldfs = get_fs(); 726 set_fs(KERNEL_DS); 727 err = sys_timer_gettime(timer_id, 728 (struct itimerspec __user *) &ts); 729 set_fs(oldfs); 730 if (!err && put_compat_itimerspec(setting, &ts)) 731 return -EFAULT; 732 return err; 733 } 734 735 long compat_sys_clock_settime(clockid_t which_clock, 736 struct compat_timespec __user *tp) 737 { 738 long err; 739 mm_segment_t oldfs; 740 struct timespec ts; 741 742 if (get_compat_timespec(&ts, tp)) 743 return -EFAULT; 744 oldfs = get_fs(); 745 set_fs(KERNEL_DS); 746 err = sys_clock_settime(which_clock, 747 (struct timespec __user *) &ts); 748 set_fs(oldfs); 749 return err; 750 } 751 752 long compat_sys_clock_gettime(clockid_t which_clock, 753 struct compat_timespec __user *tp) 754 { 755 long err; 756 mm_segment_t oldfs; 757 struct timespec ts; 758 759 oldfs = get_fs(); 760 set_fs(KERNEL_DS); 761 err = sys_clock_gettime(which_clock, 762 (struct timespec __user *) &ts); 763 set_fs(oldfs); 764 if (!err && put_compat_timespec(&ts, tp)) 765 return -EFAULT; 766 return err; 767 } 768 769 long compat_sys_clock_adjtime(clockid_t which_clock, 770 struct compat_timex __user *utp) 771 { 772 struct timex txc; 773 mm_segment_t oldfs; 774 int err, ret; 775 776 err = compat_get_timex(&txc, utp); 777 if (err) 778 return err; 779 780 oldfs = get_fs(); 781 set_fs(KERNEL_DS); 782 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc); 783 set_fs(oldfs); 784 785 err = compat_put_timex(utp, &txc); 786 if (err) 787 return err; 788 789 return ret; 790 } 791 792 long compat_sys_clock_getres(clockid_t which_clock, 793 struct compat_timespec __user *tp) 794 { 795 long err; 796 mm_segment_t oldfs; 797 struct timespec ts; 798 799 oldfs = get_fs(); 800 set_fs(KERNEL_DS); 801 err = sys_clock_getres(which_clock, 802 (struct timespec __user *) &ts); 803 set_fs(oldfs); 804 if (!err && tp && put_compat_timespec(&ts, tp)) 805 return -EFAULT; 806 return err; 807 } 808 809 static long compat_clock_nanosleep_restart(struct restart_block *restart) 810 { 811 long err; 812 mm_segment_t oldfs; 813 struct timespec tu; 814 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp; 815 816 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 817 oldfs = get_fs(); 818 set_fs(KERNEL_DS); 819 err = clock_nanosleep_restart(restart); 820 set_fs(oldfs); 821 822 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 823 put_compat_timespec(&tu, rmtp)) 824 return -EFAULT; 825 826 if (err == -ERESTART_RESTARTBLOCK) { 827 restart->fn = compat_clock_nanosleep_restart; 828 restart->nanosleep.compat_rmtp = rmtp; 829 } 830 return err; 831 } 832 833 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 834 struct compat_timespec __user *rqtp, 835 struct compat_timespec __user *rmtp) 836 { 837 long err; 838 mm_segment_t oldfs; 839 struct timespec in, out; 840 struct restart_block *restart; 841 842 if (get_compat_timespec(&in, rqtp)) 843 return -EFAULT; 844 845 oldfs = get_fs(); 846 set_fs(KERNEL_DS); 847 err = sys_clock_nanosleep(which_clock, flags, 848 (struct timespec __user *) &in, 849 (struct timespec __user *) &out); 850 set_fs(oldfs); 851 852 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 853 put_compat_timespec(&out, rmtp)) 854 return -EFAULT; 855 856 if (err == -ERESTART_RESTARTBLOCK) { 857 restart = ¤t_thread_info()->restart_block; 858 restart->fn = compat_clock_nanosleep_restart; 859 restart->nanosleep.compat_rmtp = rmtp; 860 } 861 return err; 862 } 863 864 /* 865 * We currently only need the following fields from the sigevent 866 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 867 * sigev_notify_thread_id). The others are handled in user mode. 868 * We also assume that copying sigev_value.sival_int is sufficient 869 * to keep all the bits of sigev_value.sival_ptr intact. 870 */ 871 int get_compat_sigevent(struct sigevent *event, 872 const struct compat_sigevent __user *u_event) 873 { 874 memset(event, 0, sizeof(*event)); 875 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 876 __get_user(event->sigev_value.sival_int, 877 &u_event->sigev_value.sival_int) || 878 __get_user(event->sigev_signo, &u_event->sigev_signo) || 879 __get_user(event->sigev_notify, &u_event->sigev_notify) || 880 __get_user(event->sigev_notify_thread_id, 881 &u_event->sigev_notify_thread_id)) 882 ? -EFAULT : 0; 883 } 884 885 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 886 unsigned long bitmap_size) 887 { 888 int i, j; 889 unsigned long m; 890 compat_ulong_t um; 891 unsigned long nr_compat_longs; 892 893 /* align bitmap up to nearest compat_long_t boundary */ 894 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 895 896 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 897 return -EFAULT; 898 899 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 900 901 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 902 m = 0; 903 904 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 905 /* 906 * We dont want to read past the end of the userspace 907 * bitmap. We must however ensure the end of the 908 * kernel bitmap is zeroed. 909 */ 910 if (nr_compat_longs-- > 0) { 911 if (__get_user(um, umask)) 912 return -EFAULT; 913 } else { 914 um = 0; 915 } 916 917 umask++; 918 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 919 } 920 *mask++ = m; 921 } 922 923 return 0; 924 } 925 926 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 927 unsigned long bitmap_size) 928 { 929 int i, j; 930 unsigned long m; 931 compat_ulong_t um; 932 unsigned long nr_compat_longs; 933 934 /* align bitmap up to nearest compat_long_t boundary */ 935 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 936 937 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 938 return -EFAULT; 939 940 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 941 942 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 943 m = *mask++; 944 945 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 946 um = m; 947 948 /* 949 * We dont want to write past the end of the userspace 950 * bitmap. 951 */ 952 if (nr_compat_longs-- > 0) { 953 if (__put_user(um, umask)) 954 return -EFAULT; 955 } 956 957 umask++; 958 m >>= 4*sizeof(um); 959 m >>= 4*sizeof(um); 960 } 961 } 962 963 return 0; 964 } 965 966 void 967 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 968 { 969 switch (_NSIG_WORDS) { 970 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 971 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 972 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 973 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 974 } 975 } 976 EXPORT_SYMBOL_GPL(sigset_from_compat); 977 978 asmlinkage long 979 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 980 struct compat_siginfo __user *uinfo, 981 struct compat_timespec __user *uts, compat_size_t sigsetsize) 982 { 983 compat_sigset_t s32; 984 sigset_t s; 985 struct timespec t; 986 siginfo_t info; 987 long ret; 988 989 if (sigsetsize != sizeof(sigset_t)) 990 return -EINVAL; 991 992 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 993 return -EFAULT; 994 sigset_from_compat(&s, &s32); 995 996 if (uts) { 997 if (get_compat_timespec(&t, uts)) 998 return -EFAULT; 999 } 1000 1001 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL); 1002 1003 if (ret > 0 && uinfo) { 1004 if (copy_siginfo_to_user32(uinfo, &info)) 1005 ret = -EFAULT; 1006 } 1007 1008 return ret; 1009 1010 } 1011 1012 asmlinkage long 1013 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig, 1014 struct compat_siginfo __user *uinfo) 1015 { 1016 siginfo_t info; 1017 1018 if (copy_siginfo_from_user32(&info, uinfo)) 1019 return -EFAULT; 1020 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info); 1021 } 1022 1023 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 1024 1025 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 1026 1027 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 1028 { 1029 compat_time_t i; 1030 struct timeval tv; 1031 1032 do_gettimeofday(&tv); 1033 i = tv.tv_sec; 1034 1035 if (tloc) { 1036 if (put_user(i,tloc)) 1037 return -EFAULT; 1038 } 1039 force_successful_syscall_return(); 1040 return i; 1041 } 1042 1043 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 1044 { 1045 struct timespec tv; 1046 int err; 1047 1048 if (get_user(tv.tv_sec, tptr)) 1049 return -EFAULT; 1050 1051 tv.tv_nsec = 0; 1052 1053 err = security_settime(&tv, NULL); 1054 if (err) 1055 return err; 1056 1057 do_settimeofday(&tv); 1058 return 0; 1059 } 1060 1061 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 1062 1063 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND 1064 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) 1065 { 1066 sigset_t newset; 1067 compat_sigset_t newset32; 1068 1069 /* XXX: Don't preclude handling different sized sigset_t's. */ 1070 if (sigsetsize != sizeof(sigset_t)) 1071 return -EINVAL; 1072 1073 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) 1074 return -EFAULT; 1075 sigset_from_compat(&newset, &newset32); 1076 return sigsuspend(&newset); 1077 } 1078 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ 1079 1080 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) 1081 { 1082 struct timex txc; 1083 int err, ret; 1084 1085 err = compat_get_timex(&txc, utp); 1086 if (err) 1087 return err; 1088 1089 ret = do_adjtimex(&txc); 1090 1091 err = compat_put_timex(utp, &txc); 1092 if (err) 1093 return err; 1094 1095 return ret; 1096 } 1097 1098 #ifdef CONFIG_NUMA 1099 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages, 1100 compat_uptr_t __user *pages32, 1101 const int __user *nodes, 1102 int __user *status, 1103 int flags) 1104 { 1105 const void __user * __user *pages; 1106 int i; 1107 1108 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1109 for (i = 0; i < nr_pages; i++) { 1110 compat_uptr_t p; 1111 1112 if (get_user(p, pages32 + i) || 1113 put_user(compat_ptr(p), pages + i)) 1114 return -EFAULT; 1115 } 1116 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1117 } 1118 1119 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, 1120 compat_ulong_t maxnode, 1121 const compat_ulong_t __user *old_nodes, 1122 const compat_ulong_t __user *new_nodes) 1123 { 1124 unsigned long __user *old = NULL; 1125 unsigned long __user *new = NULL; 1126 nodemask_t tmp_mask; 1127 unsigned long nr_bits; 1128 unsigned long size; 1129 1130 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1131 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1132 if (old_nodes) { 1133 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1134 return -EFAULT; 1135 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1136 if (new_nodes) 1137 new = old + size / sizeof(unsigned long); 1138 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1139 return -EFAULT; 1140 } 1141 if (new_nodes) { 1142 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1143 return -EFAULT; 1144 if (new == NULL) 1145 new = compat_alloc_user_space(size); 1146 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1147 return -EFAULT; 1148 } 1149 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1150 } 1151 #endif 1152 1153 struct compat_sysinfo { 1154 s32 uptime; 1155 u32 loads[3]; 1156 u32 totalram; 1157 u32 freeram; 1158 u32 sharedram; 1159 u32 bufferram; 1160 u32 totalswap; 1161 u32 freeswap; 1162 u16 procs; 1163 u16 pad; 1164 u32 totalhigh; 1165 u32 freehigh; 1166 u32 mem_unit; 1167 char _f[20-2*sizeof(u32)-sizeof(int)]; 1168 }; 1169 1170 asmlinkage long 1171 compat_sys_sysinfo(struct compat_sysinfo __user *info) 1172 { 1173 struct sysinfo s; 1174 1175 do_sysinfo(&s); 1176 1177 /* Check to see if any memory value is too large for 32-bit and scale 1178 * down if needed 1179 */ 1180 if ((s.totalram >> 32) || (s.totalswap >> 32)) { 1181 int bitcount = 0; 1182 1183 while (s.mem_unit < PAGE_SIZE) { 1184 s.mem_unit <<= 1; 1185 bitcount++; 1186 } 1187 1188 s.totalram >>= bitcount; 1189 s.freeram >>= bitcount; 1190 s.sharedram >>= bitcount; 1191 s.bufferram >>= bitcount; 1192 s.totalswap >>= bitcount; 1193 s.freeswap >>= bitcount; 1194 s.totalhigh >>= bitcount; 1195 s.freehigh >>= bitcount; 1196 } 1197 1198 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || 1199 __put_user (s.uptime, &info->uptime) || 1200 __put_user (s.loads[0], &info->loads[0]) || 1201 __put_user (s.loads[1], &info->loads[1]) || 1202 __put_user (s.loads[2], &info->loads[2]) || 1203 __put_user (s.totalram, &info->totalram) || 1204 __put_user (s.freeram, &info->freeram) || 1205 __put_user (s.sharedram, &info->sharedram) || 1206 __put_user (s.bufferram, &info->bufferram) || 1207 __put_user (s.totalswap, &info->totalswap) || 1208 __put_user (s.freeswap, &info->freeswap) || 1209 __put_user (s.procs, &info->procs) || 1210 __put_user (s.totalhigh, &info->totalhigh) || 1211 __put_user (s.freehigh, &info->freehigh) || 1212 __put_user (s.mem_unit, &info->mem_unit)) 1213 return -EFAULT; 1214 1215 return 0; 1216 } 1217 1218 #ifdef __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL 1219 asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid, 1220 struct compat_timespec __user *interval) 1221 { 1222 struct timespec t; 1223 int ret; 1224 mm_segment_t old_fs = get_fs(); 1225 1226 set_fs(KERNEL_DS); 1227 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); 1228 set_fs(old_fs); 1229 if (put_compat_timespec(&t, interval)) 1230 return -EFAULT; 1231 return ret; 1232 } 1233 #endif /* __ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL */ 1234 1235 /* 1236 * Allocate user-space memory for the duration of a single system call, 1237 * in order to marshall parameters inside a compat thunk. 1238 */ 1239 void __user *compat_alloc_user_space(unsigned long len) 1240 { 1241 void __user *ptr; 1242 1243 /* If len would occupy more than half of the entire compat space... */ 1244 if (unlikely(len > (((compat_uptr_t)~0) >> 1))) 1245 return NULL; 1246 1247 ptr = arch_compat_alloc_user_space(len); 1248 1249 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) 1250 return NULL; 1251 1252 return ptr; 1253 } 1254 EXPORT_SYMBOL_GPL(compat_alloc_user_space); 1255