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 COMPAT_SYSCALL_DEFINE2(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 COMPAT_SYSCALL_DEFINE3(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 COMPAT_SYSCALL_DEFINE3(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 COMPAT_SYSCALL_DEFINE4(wait4, 520 compat_pid_t, pid, 521 compat_uint_t __user *, stat_addr, 522 int, options, 523 struct compat_rusage __user *, ru) 524 { 525 if (!ru) { 526 return sys_wait4(pid, stat_addr, options, NULL); 527 } else { 528 struct rusage r; 529 int ret; 530 unsigned int status; 531 mm_segment_t old_fs = get_fs(); 532 533 set_fs (KERNEL_DS); 534 ret = sys_wait4(pid, 535 (stat_addr ? 536 (unsigned int __user *) &status : NULL), 537 options, (struct rusage __user *) &r); 538 set_fs (old_fs); 539 540 if (ret > 0) { 541 if (put_compat_rusage(&r, ru)) 542 return -EFAULT; 543 if (stat_addr && put_user(status, stat_addr)) 544 return -EFAULT; 545 } 546 return ret; 547 } 548 } 549 550 COMPAT_SYSCALL_DEFINE5(waitid, 551 int, which, compat_pid_t, pid, 552 struct compat_siginfo __user *, uinfo, int, options, 553 struct compat_rusage __user *, uru) 554 { 555 siginfo_t info; 556 struct rusage ru; 557 long ret; 558 mm_segment_t old_fs = get_fs(); 559 560 memset(&info, 0, sizeof(info)); 561 562 set_fs(KERNEL_DS); 563 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 564 uru ? (struct rusage __user *)&ru : NULL); 565 set_fs(old_fs); 566 567 if ((ret < 0) || (info.si_signo == 0)) 568 return ret; 569 570 if (uru) { 571 /* sys_waitid() overwrites everything in ru */ 572 if (COMPAT_USE_64BIT_TIME) 573 ret = copy_to_user(uru, &ru, sizeof(ru)); 574 else 575 ret = put_compat_rusage(&ru, uru); 576 if (ret) 577 return -EFAULT; 578 } 579 580 BUG_ON(info.si_code & __SI_MASK); 581 info.si_code |= __SI_CHLD; 582 return copy_siginfo_to_user32(uinfo, &info); 583 } 584 585 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 586 unsigned len, struct cpumask *new_mask) 587 { 588 unsigned long *k; 589 590 if (len < cpumask_size()) 591 memset(new_mask, 0, cpumask_size()); 592 else if (len > cpumask_size()) 593 len = cpumask_size(); 594 595 k = cpumask_bits(new_mask); 596 return compat_get_bitmap(k, user_mask_ptr, len * 8); 597 } 598 599 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 600 unsigned int len, 601 compat_ulong_t __user *user_mask_ptr) 602 { 603 cpumask_var_t new_mask; 604 int retval; 605 606 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 607 return -ENOMEM; 608 609 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 610 if (retval) 611 goto out; 612 613 retval = sched_setaffinity(pid, new_mask); 614 out: 615 free_cpumask_var(new_mask); 616 return retval; 617 } 618 619 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 620 compat_ulong_t __user *user_mask_ptr) 621 { 622 int ret; 623 cpumask_var_t mask; 624 625 if ((len * BITS_PER_BYTE) < nr_cpu_ids) 626 return -EINVAL; 627 if (len & (sizeof(compat_ulong_t)-1)) 628 return -EINVAL; 629 630 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 631 return -ENOMEM; 632 633 ret = sched_getaffinity(pid, mask); 634 if (ret == 0) { 635 size_t retlen = min_t(size_t, len, cpumask_size()); 636 637 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) 638 ret = -EFAULT; 639 else 640 ret = retlen; 641 } 642 free_cpumask_var(mask); 643 644 return ret; 645 } 646 647 int get_compat_itimerspec(struct itimerspec *dst, 648 const struct compat_itimerspec __user *src) 649 { 650 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 651 get_compat_timespec(&dst->it_value, &src->it_value)) 652 return -EFAULT; 653 return 0; 654 } 655 656 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 657 const struct itimerspec *src) 658 { 659 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 660 put_compat_timespec(&src->it_value, &dst->it_value)) 661 return -EFAULT; 662 return 0; 663 } 664 665 long compat_sys_timer_create(clockid_t which_clock, 666 struct compat_sigevent __user *timer_event_spec, 667 timer_t __user *created_timer_id) 668 { 669 struct sigevent __user *event = NULL; 670 671 if (timer_event_spec) { 672 struct sigevent kevent; 673 674 event = compat_alloc_user_space(sizeof(*event)); 675 if (get_compat_sigevent(&kevent, timer_event_spec) || 676 copy_to_user(event, &kevent, sizeof(*event))) 677 return -EFAULT; 678 } 679 680 return sys_timer_create(which_clock, event, created_timer_id); 681 } 682 683 long compat_sys_timer_settime(timer_t timer_id, int flags, 684 struct compat_itimerspec __user *new, 685 struct compat_itimerspec __user *old) 686 { 687 long err; 688 mm_segment_t oldfs; 689 struct itimerspec newts, oldts; 690 691 if (!new) 692 return -EINVAL; 693 if (get_compat_itimerspec(&newts, new)) 694 return -EFAULT; 695 oldfs = get_fs(); 696 set_fs(KERNEL_DS); 697 err = sys_timer_settime(timer_id, flags, 698 (struct itimerspec __user *) &newts, 699 (struct itimerspec __user *) &oldts); 700 set_fs(oldfs); 701 if (!err && old && put_compat_itimerspec(old, &oldts)) 702 return -EFAULT; 703 return err; 704 } 705 706 long compat_sys_timer_gettime(timer_t timer_id, 707 struct compat_itimerspec __user *setting) 708 { 709 long err; 710 mm_segment_t oldfs; 711 struct itimerspec ts; 712 713 oldfs = get_fs(); 714 set_fs(KERNEL_DS); 715 err = sys_timer_gettime(timer_id, 716 (struct itimerspec __user *) &ts); 717 set_fs(oldfs); 718 if (!err && put_compat_itimerspec(setting, &ts)) 719 return -EFAULT; 720 return err; 721 } 722 723 long compat_sys_clock_settime(clockid_t which_clock, 724 struct compat_timespec __user *tp) 725 { 726 long err; 727 mm_segment_t oldfs; 728 struct timespec ts; 729 730 if (get_compat_timespec(&ts, tp)) 731 return -EFAULT; 732 oldfs = get_fs(); 733 set_fs(KERNEL_DS); 734 err = sys_clock_settime(which_clock, 735 (struct timespec __user *) &ts); 736 set_fs(oldfs); 737 return err; 738 } 739 740 long compat_sys_clock_gettime(clockid_t which_clock, 741 struct compat_timespec __user *tp) 742 { 743 long err; 744 mm_segment_t oldfs; 745 struct timespec ts; 746 747 oldfs = get_fs(); 748 set_fs(KERNEL_DS); 749 err = sys_clock_gettime(which_clock, 750 (struct timespec __user *) &ts); 751 set_fs(oldfs); 752 if (!err && put_compat_timespec(&ts, tp)) 753 return -EFAULT; 754 return err; 755 } 756 757 long compat_sys_clock_adjtime(clockid_t which_clock, 758 struct compat_timex __user *utp) 759 { 760 struct timex txc; 761 mm_segment_t oldfs; 762 int err, ret; 763 764 err = compat_get_timex(&txc, utp); 765 if (err) 766 return err; 767 768 oldfs = get_fs(); 769 set_fs(KERNEL_DS); 770 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc); 771 set_fs(oldfs); 772 773 err = compat_put_timex(utp, &txc); 774 if (err) 775 return err; 776 777 return ret; 778 } 779 780 long compat_sys_clock_getres(clockid_t which_clock, 781 struct compat_timespec __user *tp) 782 { 783 long err; 784 mm_segment_t oldfs; 785 struct timespec ts; 786 787 oldfs = get_fs(); 788 set_fs(KERNEL_DS); 789 err = sys_clock_getres(which_clock, 790 (struct timespec __user *) &ts); 791 set_fs(oldfs); 792 if (!err && tp && put_compat_timespec(&ts, tp)) 793 return -EFAULT; 794 return err; 795 } 796 797 static long compat_clock_nanosleep_restart(struct restart_block *restart) 798 { 799 long err; 800 mm_segment_t oldfs; 801 struct timespec tu; 802 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp; 803 804 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 805 oldfs = get_fs(); 806 set_fs(KERNEL_DS); 807 err = clock_nanosleep_restart(restart); 808 set_fs(oldfs); 809 810 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 811 put_compat_timespec(&tu, rmtp)) 812 return -EFAULT; 813 814 if (err == -ERESTART_RESTARTBLOCK) { 815 restart->fn = compat_clock_nanosleep_restart; 816 restart->nanosleep.compat_rmtp = rmtp; 817 } 818 return err; 819 } 820 821 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 822 struct compat_timespec __user *rqtp, 823 struct compat_timespec __user *rmtp) 824 { 825 long err; 826 mm_segment_t oldfs; 827 struct timespec in, out; 828 struct restart_block *restart; 829 830 if (get_compat_timespec(&in, rqtp)) 831 return -EFAULT; 832 833 oldfs = get_fs(); 834 set_fs(KERNEL_DS); 835 err = sys_clock_nanosleep(which_clock, flags, 836 (struct timespec __user *) &in, 837 (struct timespec __user *) &out); 838 set_fs(oldfs); 839 840 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 841 put_compat_timespec(&out, rmtp)) 842 return -EFAULT; 843 844 if (err == -ERESTART_RESTARTBLOCK) { 845 restart = ¤t_thread_info()->restart_block; 846 restart->fn = compat_clock_nanosleep_restart; 847 restart->nanosleep.compat_rmtp = rmtp; 848 } 849 return err; 850 } 851 852 /* 853 * We currently only need the following fields from the sigevent 854 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 855 * sigev_notify_thread_id). The others are handled in user mode. 856 * We also assume that copying sigev_value.sival_int is sufficient 857 * to keep all the bits of sigev_value.sival_ptr intact. 858 */ 859 int get_compat_sigevent(struct sigevent *event, 860 const struct compat_sigevent __user *u_event) 861 { 862 memset(event, 0, sizeof(*event)); 863 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 864 __get_user(event->sigev_value.sival_int, 865 &u_event->sigev_value.sival_int) || 866 __get_user(event->sigev_signo, &u_event->sigev_signo) || 867 __get_user(event->sigev_notify, &u_event->sigev_notify) || 868 __get_user(event->sigev_notify_thread_id, 869 &u_event->sigev_notify_thread_id)) 870 ? -EFAULT : 0; 871 } 872 873 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 874 unsigned long bitmap_size) 875 { 876 int i, j; 877 unsigned long m; 878 compat_ulong_t um; 879 unsigned long nr_compat_longs; 880 881 /* align bitmap up to nearest compat_long_t boundary */ 882 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 883 884 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 885 return -EFAULT; 886 887 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 888 889 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 890 m = 0; 891 892 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 893 /* 894 * We dont want to read past the end of the userspace 895 * bitmap. We must however ensure the end of the 896 * kernel bitmap is zeroed. 897 */ 898 if (nr_compat_longs-- > 0) { 899 if (__get_user(um, umask)) 900 return -EFAULT; 901 } else { 902 um = 0; 903 } 904 905 umask++; 906 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 907 } 908 *mask++ = m; 909 } 910 911 return 0; 912 } 913 914 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 915 unsigned long bitmap_size) 916 { 917 int i, j; 918 unsigned long m; 919 compat_ulong_t um; 920 unsigned long nr_compat_longs; 921 922 /* align bitmap up to nearest compat_long_t boundary */ 923 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 924 925 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 926 return -EFAULT; 927 928 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 929 930 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 931 m = *mask++; 932 933 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 934 um = m; 935 936 /* 937 * We dont want to write past the end of the userspace 938 * bitmap. 939 */ 940 if (nr_compat_longs-- > 0) { 941 if (__put_user(um, umask)) 942 return -EFAULT; 943 } 944 945 umask++; 946 m >>= 4*sizeof(um); 947 m >>= 4*sizeof(um); 948 } 949 } 950 951 return 0; 952 } 953 954 void 955 sigset_from_compat(sigset_t *set, const compat_sigset_t *compat) 956 { 957 switch (_NSIG_WORDS) { 958 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 959 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 960 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 961 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 962 } 963 } 964 EXPORT_SYMBOL_GPL(sigset_from_compat); 965 966 void 967 sigset_to_compat(compat_sigset_t *compat, const sigset_t *set) 968 { 969 switch (_NSIG_WORDS) { 970 case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3]; 971 case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2]; 972 case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1]; 973 case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0]; 974 } 975 } 976 977 COMPAT_SYSCALL_DEFINE4(rt_sigtimedwait, compat_sigset_t __user *, uthese, 978 struct compat_siginfo __user *, uinfo, 979 struct compat_timespec __user *, uts, compat_size_t, sigsetsize) 980 { 981 compat_sigset_t s32; 982 sigset_t s; 983 struct timespec t; 984 siginfo_t info; 985 long ret; 986 987 if (sigsetsize != sizeof(sigset_t)) 988 return -EINVAL; 989 990 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 991 return -EFAULT; 992 sigset_from_compat(&s, &s32); 993 994 if (uts) { 995 if (compat_get_timespec(&t, uts)) 996 return -EFAULT; 997 } 998 999 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL); 1000 1001 if (ret > 0 && uinfo) { 1002 if (copy_siginfo_to_user32(uinfo, &info)) 1003 ret = -EFAULT; 1004 } 1005 1006 return ret; 1007 } 1008 1009 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 1010 1011 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 1012 1013 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 1014 { 1015 compat_time_t i; 1016 struct timeval tv; 1017 1018 do_gettimeofday(&tv); 1019 i = tv.tv_sec; 1020 1021 if (tloc) { 1022 if (put_user(i,tloc)) 1023 return -EFAULT; 1024 } 1025 force_successful_syscall_return(); 1026 return i; 1027 } 1028 1029 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 1030 { 1031 struct timespec tv; 1032 int err; 1033 1034 if (get_user(tv.tv_sec, tptr)) 1035 return -EFAULT; 1036 1037 tv.tv_nsec = 0; 1038 1039 err = security_settime(&tv, NULL); 1040 if (err) 1041 return err; 1042 1043 do_settimeofday(&tv); 1044 return 0; 1045 } 1046 1047 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 1048 1049 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) 1050 { 1051 struct timex txc; 1052 int err, ret; 1053 1054 err = compat_get_timex(&txc, utp); 1055 if (err) 1056 return err; 1057 1058 ret = do_adjtimex(&txc); 1059 1060 err = compat_put_timex(utp, &txc); 1061 if (err) 1062 return err; 1063 1064 return ret; 1065 } 1066 1067 #ifdef CONFIG_NUMA 1068 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages, 1069 compat_uptr_t __user *pages32, 1070 const int __user *nodes, 1071 int __user *status, 1072 int flags) 1073 { 1074 const void __user * __user *pages; 1075 int i; 1076 1077 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1078 for (i = 0; i < nr_pages; i++) { 1079 compat_uptr_t p; 1080 1081 if (get_user(p, pages32 + i) || 1082 put_user(compat_ptr(p), pages + i)) 1083 return -EFAULT; 1084 } 1085 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1086 } 1087 1088 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, 1089 compat_ulong_t maxnode, 1090 const compat_ulong_t __user *old_nodes, 1091 const compat_ulong_t __user *new_nodes) 1092 { 1093 unsigned long __user *old = NULL; 1094 unsigned long __user *new = NULL; 1095 nodemask_t tmp_mask; 1096 unsigned long nr_bits; 1097 unsigned long size; 1098 1099 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1100 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1101 if (old_nodes) { 1102 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1103 return -EFAULT; 1104 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1105 if (new_nodes) 1106 new = old + size / sizeof(unsigned long); 1107 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1108 return -EFAULT; 1109 } 1110 if (new_nodes) { 1111 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1112 return -EFAULT; 1113 if (new == NULL) 1114 new = compat_alloc_user_space(size); 1115 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1116 return -EFAULT; 1117 } 1118 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1119 } 1120 #endif 1121 1122 COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval, 1123 compat_pid_t, pid, 1124 struct compat_timespec __user *, interval) 1125 { 1126 struct timespec t; 1127 int ret; 1128 mm_segment_t old_fs = get_fs(); 1129 1130 set_fs(KERNEL_DS); 1131 ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); 1132 set_fs(old_fs); 1133 if (put_compat_timespec(&t, interval)) 1134 return -EFAULT; 1135 return ret; 1136 } 1137 1138 /* 1139 * Allocate user-space memory for the duration of a single system call, 1140 * in order to marshall parameters inside a compat thunk. 1141 */ 1142 void __user *compat_alloc_user_space(unsigned long len) 1143 { 1144 void __user *ptr; 1145 1146 /* If len would occupy more than half of the entire compat space... */ 1147 if (unlikely(len > (((compat_uptr_t)~0) >> 1))) 1148 return NULL; 1149 1150 ptr = arch_compat_alloc_user_space(len); 1151 1152 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) 1153 return NULL; 1154 1155 return ptr; 1156 } 1157 EXPORT_SYMBOL_GPL(compat_alloc_user_space); 1158