1 /* 2 * linux/kernel/compat.c 3 * 4 * Kernel compatibililty routines for e.g. 32 bit syscall support 5 * on 64 bit kernels. 6 * 7 * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/linkage.h> 15 #include <linux/compat.h> 16 #include <linux/errno.h> 17 #include <linux/time.h> 18 #include <linux/signal.h> 19 #include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */ 20 #include <linux/syscalls.h> 21 #include <linux/unistd.h> 22 #include <linux/security.h> 23 #include <linux/timex.h> 24 #include <linux/migrate.h> 25 #include <linux/posix-timers.h> 26 #include <linux/times.h> 27 #include <linux/ptrace.h> 28 #include <linux/gfp.h> 29 30 #include <asm/uaccess.h> 31 32 /* 33 * Note that the native side is already converted to a timespec, because 34 * that's what we want anyway. 35 */ 36 static int compat_get_timeval(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(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(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(&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_timespec(struct timespec *ts, const struct compat_timespec __user *cts) 149 { 150 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || 151 __get_user(ts->tv_sec, &cts->tv_sec) || 152 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 153 } 154 155 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts) 156 { 157 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || 158 __put_user(ts->tv_sec, &cts->tv_sec) || 159 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 160 } 161 EXPORT_SYMBOL_GPL(put_compat_timespec); 162 163 static long compat_nanosleep_restart(struct restart_block *restart) 164 { 165 struct compat_timespec __user *rmtp; 166 struct timespec rmt; 167 mm_segment_t oldfs; 168 long ret; 169 170 restart->nanosleep.rmtp = (struct timespec __user *) &rmt; 171 oldfs = get_fs(); 172 set_fs(KERNEL_DS); 173 ret = hrtimer_nanosleep_restart(restart); 174 set_fs(oldfs); 175 176 if (ret) { 177 rmtp = restart->nanosleep.compat_rmtp; 178 179 if (rmtp && put_compat_timespec(&rmt, rmtp)) 180 return -EFAULT; 181 } 182 183 return ret; 184 } 185 186 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, 187 struct compat_timespec __user *rmtp) 188 { 189 struct timespec tu, rmt; 190 mm_segment_t oldfs; 191 long ret; 192 193 if (get_compat_timespec(&tu, rqtp)) 194 return -EFAULT; 195 196 if (!timespec_valid(&tu)) 197 return -EINVAL; 198 199 oldfs = get_fs(); 200 set_fs(KERNEL_DS); 201 ret = hrtimer_nanosleep(&tu, 202 rmtp ? (struct timespec __user *)&rmt : NULL, 203 HRTIMER_MODE_REL, CLOCK_MONOTONIC); 204 set_fs(oldfs); 205 206 if (ret) { 207 struct restart_block *restart 208 = ¤t_thread_info()->restart_block; 209 210 restart->fn = compat_nanosleep_restart; 211 restart->nanosleep.compat_rmtp = rmtp; 212 213 if (rmtp && put_compat_timespec(&rmt, rmtp)) 214 return -EFAULT; 215 } 216 217 return ret; 218 } 219 220 static inline long get_compat_itimerval(struct itimerval *o, 221 struct compat_itimerval __user *i) 222 { 223 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 224 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 225 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 226 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 227 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 228 } 229 230 static inline long put_compat_itimerval(struct compat_itimerval __user *o, 231 struct itimerval *i) 232 { 233 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 234 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 235 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 236 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 237 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 238 } 239 240 asmlinkage long compat_sys_getitimer(int which, 241 struct compat_itimerval __user *it) 242 { 243 struct itimerval kit; 244 int error; 245 246 error = do_getitimer(which, &kit); 247 if (!error && put_compat_itimerval(it, &kit)) 248 error = -EFAULT; 249 return error; 250 } 251 252 asmlinkage long compat_sys_setitimer(int which, 253 struct compat_itimerval __user *in, 254 struct compat_itimerval __user *out) 255 { 256 struct itimerval kin, kout; 257 int error; 258 259 if (in) { 260 if (get_compat_itimerval(&kin, in)) 261 return -EFAULT; 262 } else 263 memset(&kin, 0, sizeof(kin)); 264 265 error = do_setitimer(which, &kin, out ? &kout : NULL); 266 if (error || !out) 267 return error; 268 if (put_compat_itimerval(out, &kout)) 269 return -EFAULT; 270 return 0; 271 } 272 273 static compat_clock_t clock_t_to_compat_clock_t(clock_t x) 274 { 275 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); 276 } 277 278 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) 279 { 280 if (tbuf) { 281 struct tms tms; 282 struct compat_tms tmp; 283 284 do_sys_times(&tms); 285 /* Convert our struct tms to the compat version. */ 286 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); 287 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); 288 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); 289 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); 290 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 291 return -EFAULT; 292 } 293 force_successful_syscall_return(); 294 return compat_jiffies_to_clock_t(jiffies); 295 } 296 297 #ifdef __ARCH_WANT_SYS_SIGPENDING 298 299 /* 300 * Assumption: old_sigset_t and compat_old_sigset_t are both 301 * types that can be passed to put_user()/get_user(). 302 */ 303 304 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) 305 { 306 old_sigset_t s; 307 long ret; 308 mm_segment_t old_fs = get_fs(); 309 310 set_fs(KERNEL_DS); 311 ret = sys_sigpending((old_sigset_t __user *) &s); 312 set_fs(old_fs); 313 if (ret == 0) 314 ret = put_user(s, set); 315 return ret; 316 } 317 318 #endif 319 320 #ifdef __ARCH_WANT_SYS_SIGPROCMASK 321 322 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set, 323 compat_old_sigset_t __user *oset) 324 { 325 old_sigset_t s; 326 long ret; 327 mm_segment_t old_fs; 328 329 if (set && get_user(s, set)) 330 return -EFAULT; 331 old_fs = get_fs(); 332 set_fs(KERNEL_DS); 333 ret = sys_sigprocmask(how, 334 set ? (old_sigset_t __user *) &s : NULL, 335 oset ? (old_sigset_t __user *) &s : NULL); 336 set_fs(old_fs); 337 if (ret == 0) 338 if (oset) 339 ret = put_user(s, oset); 340 return ret; 341 } 342 343 #endif 344 345 asmlinkage long compat_sys_setrlimit(unsigned int resource, 346 struct compat_rlimit __user *rlim) 347 { 348 struct rlimit r; 349 350 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 351 __get_user(r.rlim_cur, &rlim->rlim_cur) || 352 __get_user(r.rlim_max, &rlim->rlim_max)) 353 return -EFAULT; 354 355 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 356 r.rlim_cur = RLIM_INFINITY; 357 if (r.rlim_max == COMPAT_RLIM_INFINITY) 358 r.rlim_max = RLIM_INFINITY; 359 return do_prlimit(current, resource, &r, NULL); 360 } 361 362 #ifdef COMPAT_RLIM_OLD_INFINITY 363 364 asmlinkage long compat_sys_old_getrlimit(unsigned int resource, 365 struct compat_rlimit __user *rlim) 366 { 367 struct rlimit r; 368 int ret; 369 mm_segment_t old_fs = get_fs(); 370 371 set_fs(KERNEL_DS); 372 ret = sys_old_getrlimit(resource, &r); 373 set_fs(old_fs); 374 375 if (!ret) { 376 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 377 r.rlim_cur = COMPAT_RLIM_INFINITY; 378 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 379 r.rlim_max = COMPAT_RLIM_INFINITY; 380 381 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 382 __put_user(r.rlim_cur, &rlim->rlim_cur) || 383 __put_user(r.rlim_max, &rlim->rlim_max)) 384 return -EFAULT; 385 } 386 return ret; 387 } 388 389 #endif 390 391 asmlinkage long compat_sys_getrlimit(unsigned int resource, 392 struct compat_rlimit __user *rlim) 393 { 394 struct rlimit r; 395 int ret; 396 397 ret = do_prlimit(current, resource, NULL, &r); 398 if (!ret) { 399 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 400 r.rlim_cur = COMPAT_RLIM_INFINITY; 401 if (r.rlim_max > COMPAT_RLIM_INFINITY) 402 r.rlim_max = COMPAT_RLIM_INFINITY; 403 404 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 405 __put_user(r.rlim_cur, &rlim->rlim_cur) || 406 __put_user(r.rlim_max, &rlim->rlim_max)) 407 return -EFAULT; 408 } 409 return ret; 410 } 411 412 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 413 { 414 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 415 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 416 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 417 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 418 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 419 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 420 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 421 __put_user(r->ru_idrss, &ru->ru_idrss) || 422 __put_user(r->ru_isrss, &ru->ru_isrss) || 423 __put_user(r->ru_minflt, &ru->ru_minflt) || 424 __put_user(r->ru_majflt, &ru->ru_majflt) || 425 __put_user(r->ru_nswap, &ru->ru_nswap) || 426 __put_user(r->ru_inblock, &ru->ru_inblock) || 427 __put_user(r->ru_oublock, &ru->ru_oublock) || 428 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 429 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 430 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 431 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 432 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 433 return -EFAULT; 434 return 0; 435 } 436 437 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) 438 { 439 struct rusage r; 440 int ret; 441 mm_segment_t old_fs = get_fs(); 442 443 set_fs(KERNEL_DS); 444 ret = sys_getrusage(who, (struct rusage __user *) &r); 445 set_fs(old_fs); 446 447 if (ret) 448 return ret; 449 450 if (put_compat_rusage(&r, ru)) 451 return -EFAULT; 452 453 return 0; 454 } 455 456 asmlinkage long 457 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, 458 struct compat_rusage __user *ru) 459 { 460 if (!ru) { 461 return sys_wait4(pid, stat_addr, options, NULL); 462 } else { 463 struct rusage r; 464 int ret; 465 unsigned int status; 466 mm_segment_t old_fs = get_fs(); 467 468 set_fs (KERNEL_DS); 469 ret = sys_wait4(pid, 470 (stat_addr ? 471 (unsigned int __user *) &status : NULL), 472 options, (struct rusage __user *) &r); 473 set_fs (old_fs); 474 475 if (ret > 0) { 476 if (put_compat_rusage(&r, ru)) 477 return -EFAULT; 478 if (stat_addr && put_user(status, stat_addr)) 479 return -EFAULT; 480 } 481 return ret; 482 } 483 } 484 485 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, 486 struct compat_siginfo __user *uinfo, int options, 487 struct compat_rusage __user *uru) 488 { 489 siginfo_t info; 490 struct rusage ru; 491 long ret; 492 mm_segment_t old_fs = get_fs(); 493 494 memset(&info, 0, sizeof(info)); 495 496 set_fs(KERNEL_DS); 497 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 498 uru ? (struct rusage __user *)&ru : NULL); 499 set_fs(old_fs); 500 501 if ((ret < 0) || (info.si_signo == 0)) 502 return ret; 503 504 if (uru) { 505 ret = put_compat_rusage(&ru, uru); 506 if (ret) 507 return ret; 508 } 509 510 BUG_ON(info.si_code & __SI_MASK); 511 info.si_code |= __SI_CHLD; 512 return copy_siginfo_to_user32(uinfo, &info); 513 } 514 515 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 516 unsigned len, struct cpumask *new_mask) 517 { 518 unsigned long *k; 519 520 if (len < cpumask_size()) 521 memset(new_mask, 0, cpumask_size()); 522 else if (len > cpumask_size()) 523 len = cpumask_size(); 524 525 k = cpumask_bits(new_mask); 526 return compat_get_bitmap(k, user_mask_ptr, len * 8); 527 } 528 529 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 530 unsigned int len, 531 compat_ulong_t __user *user_mask_ptr) 532 { 533 cpumask_var_t new_mask; 534 int retval; 535 536 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 537 return -ENOMEM; 538 539 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 540 if (retval) 541 goto out; 542 543 retval = sched_setaffinity(pid, new_mask); 544 out: 545 free_cpumask_var(new_mask); 546 return retval; 547 } 548 549 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 550 compat_ulong_t __user *user_mask_ptr) 551 { 552 int ret; 553 cpumask_var_t mask; 554 555 if ((len * BITS_PER_BYTE) < nr_cpu_ids) 556 return -EINVAL; 557 if (len & (sizeof(compat_ulong_t)-1)) 558 return -EINVAL; 559 560 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 561 return -ENOMEM; 562 563 ret = sched_getaffinity(pid, mask); 564 if (ret == 0) { 565 size_t retlen = min_t(size_t, len, cpumask_size()); 566 567 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) 568 ret = -EFAULT; 569 else 570 ret = retlen; 571 } 572 free_cpumask_var(mask); 573 574 return ret; 575 } 576 577 int get_compat_itimerspec(struct itimerspec *dst, 578 const struct compat_itimerspec __user *src) 579 { 580 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 581 get_compat_timespec(&dst->it_value, &src->it_value)) 582 return -EFAULT; 583 return 0; 584 } 585 586 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 587 const struct itimerspec *src) 588 { 589 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 590 put_compat_timespec(&src->it_value, &dst->it_value)) 591 return -EFAULT; 592 return 0; 593 } 594 595 long compat_sys_timer_create(clockid_t which_clock, 596 struct compat_sigevent __user *timer_event_spec, 597 timer_t __user *created_timer_id) 598 { 599 struct sigevent __user *event = NULL; 600 601 if (timer_event_spec) { 602 struct sigevent kevent; 603 604 event = compat_alloc_user_space(sizeof(*event)); 605 if (get_compat_sigevent(&kevent, timer_event_spec) || 606 copy_to_user(event, &kevent, sizeof(*event))) 607 return -EFAULT; 608 } 609 610 return sys_timer_create(which_clock, event, created_timer_id); 611 } 612 613 long compat_sys_timer_settime(timer_t timer_id, int flags, 614 struct compat_itimerspec __user *new, 615 struct compat_itimerspec __user *old) 616 { 617 long err; 618 mm_segment_t oldfs; 619 struct itimerspec newts, oldts; 620 621 if (!new) 622 return -EINVAL; 623 if (get_compat_itimerspec(&newts, new)) 624 return -EFAULT; 625 oldfs = get_fs(); 626 set_fs(KERNEL_DS); 627 err = sys_timer_settime(timer_id, flags, 628 (struct itimerspec __user *) &newts, 629 (struct itimerspec __user *) &oldts); 630 set_fs(oldfs); 631 if (!err && old && put_compat_itimerspec(old, &oldts)) 632 return -EFAULT; 633 return err; 634 } 635 636 long compat_sys_timer_gettime(timer_t timer_id, 637 struct compat_itimerspec __user *setting) 638 { 639 long err; 640 mm_segment_t oldfs; 641 struct itimerspec ts; 642 643 oldfs = get_fs(); 644 set_fs(KERNEL_DS); 645 err = sys_timer_gettime(timer_id, 646 (struct itimerspec __user *) &ts); 647 set_fs(oldfs); 648 if (!err && put_compat_itimerspec(setting, &ts)) 649 return -EFAULT; 650 return err; 651 } 652 653 long compat_sys_clock_settime(clockid_t which_clock, 654 struct compat_timespec __user *tp) 655 { 656 long err; 657 mm_segment_t oldfs; 658 struct timespec ts; 659 660 if (get_compat_timespec(&ts, tp)) 661 return -EFAULT; 662 oldfs = get_fs(); 663 set_fs(KERNEL_DS); 664 err = sys_clock_settime(which_clock, 665 (struct timespec __user *) &ts); 666 set_fs(oldfs); 667 return err; 668 } 669 670 long compat_sys_clock_gettime(clockid_t which_clock, 671 struct compat_timespec __user *tp) 672 { 673 long err; 674 mm_segment_t oldfs; 675 struct timespec ts; 676 677 oldfs = get_fs(); 678 set_fs(KERNEL_DS); 679 err = sys_clock_gettime(which_clock, 680 (struct timespec __user *) &ts); 681 set_fs(oldfs); 682 if (!err && put_compat_timespec(&ts, tp)) 683 return -EFAULT; 684 return err; 685 } 686 687 long compat_sys_clock_adjtime(clockid_t which_clock, 688 struct compat_timex __user *utp) 689 { 690 struct timex txc; 691 mm_segment_t oldfs; 692 int err, ret; 693 694 err = compat_get_timex(&txc, utp); 695 if (err) 696 return err; 697 698 oldfs = get_fs(); 699 set_fs(KERNEL_DS); 700 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc); 701 set_fs(oldfs); 702 703 err = compat_put_timex(utp, &txc); 704 if (err) 705 return err; 706 707 return ret; 708 } 709 710 long compat_sys_clock_getres(clockid_t which_clock, 711 struct compat_timespec __user *tp) 712 { 713 long err; 714 mm_segment_t oldfs; 715 struct timespec ts; 716 717 oldfs = get_fs(); 718 set_fs(KERNEL_DS); 719 err = sys_clock_getres(which_clock, 720 (struct timespec __user *) &ts); 721 set_fs(oldfs); 722 if (!err && tp && put_compat_timespec(&ts, tp)) 723 return -EFAULT; 724 return err; 725 } 726 727 static long compat_clock_nanosleep_restart(struct restart_block *restart) 728 { 729 long err; 730 mm_segment_t oldfs; 731 struct timespec tu; 732 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp; 733 734 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 735 oldfs = get_fs(); 736 set_fs(KERNEL_DS); 737 err = clock_nanosleep_restart(restart); 738 set_fs(oldfs); 739 740 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 741 put_compat_timespec(&tu, rmtp)) 742 return -EFAULT; 743 744 if (err == -ERESTART_RESTARTBLOCK) { 745 restart->fn = compat_clock_nanosleep_restart; 746 restart->nanosleep.compat_rmtp = rmtp; 747 } 748 return err; 749 } 750 751 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 752 struct compat_timespec __user *rqtp, 753 struct compat_timespec __user *rmtp) 754 { 755 long err; 756 mm_segment_t oldfs; 757 struct timespec in, out; 758 struct restart_block *restart; 759 760 if (get_compat_timespec(&in, rqtp)) 761 return -EFAULT; 762 763 oldfs = get_fs(); 764 set_fs(KERNEL_DS); 765 err = sys_clock_nanosleep(which_clock, flags, 766 (struct timespec __user *) &in, 767 (struct timespec __user *) &out); 768 set_fs(oldfs); 769 770 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 771 put_compat_timespec(&out, rmtp)) 772 return -EFAULT; 773 774 if (err == -ERESTART_RESTARTBLOCK) { 775 restart = ¤t_thread_info()->restart_block; 776 restart->fn = compat_clock_nanosleep_restart; 777 restart->nanosleep.compat_rmtp = rmtp; 778 } 779 return err; 780 } 781 782 /* 783 * We currently only need the following fields from the sigevent 784 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 785 * sigev_notify_thread_id). The others are handled in user mode. 786 * We also assume that copying sigev_value.sival_int is sufficient 787 * to keep all the bits of sigev_value.sival_ptr intact. 788 */ 789 int get_compat_sigevent(struct sigevent *event, 790 const struct compat_sigevent __user *u_event) 791 { 792 memset(event, 0, sizeof(*event)); 793 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 794 __get_user(event->sigev_value.sival_int, 795 &u_event->sigev_value.sival_int) || 796 __get_user(event->sigev_signo, &u_event->sigev_signo) || 797 __get_user(event->sigev_notify, &u_event->sigev_notify) || 798 __get_user(event->sigev_notify_thread_id, 799 &u_event->sigev_notify_thread_id)) 800 ? -EFAULT : 0; 801 } 802 803 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 804 unsigned long bitmap_size) 805 { 806 int i, j; 807 unsigned long m; 808 compat_ulong_t um; 809 unsigned long nr_compat_longs; 810 811 /* align bitmap up to nearest compat_long_t boundary */ 812 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 813 814 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 815 return -EFAULT; 816 817 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 818 819 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 820 m = 0; 821 822 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 823 /* 824 * We dont want to read past the end of the userspace 825 * bitmap. We must however ensure the end of the 826 * kernel bitmap is zeroed. 827 */ 828 if (nr_compat_longs-- > 0) { 829 if (__get_user(um, umask)) 830 return -EFAULT; 831 } else { 832 um = 0; 833 } 834 835 umask++; 836 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 837 } 838 *mask++ = m; 839 } 840 841 return 0; 842 } 843 844 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 845 unsigned long bitmap_size) 846 { 847 int i, j; 848 unsigned long m; 849 compat_ulong_t um; 850 unsigned long nr_compat_longs; 851 852 /* align bitmap up to nearest compat_long_t boundary */ 853 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 854 855 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 856 return -EFAULT; 857 858 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 859 860 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 861 m = *mask++; 862 863 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 864 um = m; 865 866 /* 867 * We dont want to write past the end of the userspace 868 * bitmap. 869 */ 870 if (nr_compat_longs-- > 0) { 871 if (__put_user(um, umask)) 872 return -EFAULT; 873 } 874 875 umask++; 876 m >>= 4*sizeof(um); 877 m >>= 4*sizeof(um); 878 } 879 } 880 881 return 0; 882 } 883 884 void 885 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 886 { 887 switch (_NSIG_WORDS) { 888 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 889 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 890 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 891 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 892 } 893 } 894 EXPORT_SYMBOL_GPL(sigset_from_compat); 895 896 asmlinkage long 897 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 898 struct compat_siginfo __user *uinfo, 899 struct compat_timespec __user *uts, compat_size_t sigsetsize) 900 { 901 compat_sigset_t s32; 902 sigset_t s; 903 struct timespec t; 904 siginfo_t info; 905 long ret; 906 907 if (sigsetsize != sizeof(sigset_t)) 908 return -EINVAL; 909 910 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 911 return -EFAULT; 912 sigset_from_compat(&s, &s32); 913 914 if (uts) { 915 if (get_compat_timespec(&t, uts)) 916 return -EFAULT; 917 } 918 919 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL); 920 921 if (ret > 0 && uinfo) { 922 if (copy_siginfo_to_user32(uinfo, &info)) 923 ret = -EFAULT; 924 } 925 926 return ret; 927 928 } 929 930 asmlinkage long 931 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig, 932 struct compat_siginfo __user *uinfo) 933 { 934 siginfo_t info; 935 936 if (copy_siginfo_from_user32(&info, uinfo)) 937 return -EFAULT; 938 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info); 939 } 940 941 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 942 943 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 944 945 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 946 { 947 compat_time_t i; 948 struct timeval tv; 949 950 do_gettimeofday(&tv); 951 i = tv.tv_sec; 952 953 if (tloc) { 954 if (put_user(i,tloc)) 955 return -EFAULT; 956 } 957 force_successful_syscall_return(); 958 return i; 959 } 960 961 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 962 { 963 struct timespec tv; 964 int err; 965 966 if (get_user(tv.tv_sec, tptr)) 967 return -EFAULT; 968 969 tv.tv_nsec = 0; 970 971 err = security_settime(&tv, NULL); 972 if (err) 973 return err; 974 975 do_settimeofday(&tv); 976 return 0; 977 } 978 979 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 980 981 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND 982 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) 983 { 984 sigset_t newset; 985 compat_sigset_t newset32; 986 987 /* XXX: Don't preclude handling different sized sigset_t's. */ 988 if (sigsetsize != sizeof(sigset_t)) 989 return -EINVAL; 990 991 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) 992 return -EFAULT; 993 sigset_from_compat(&newset, &newset32); 994 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 995 996 current->saved_sigmask = current->blocked; 997 set_current_blocked(&newset); 998 999 current->state = TASK_INTERRUPTIBLE; 1000 schedule(); 1001 set_restore_sigmask(); 1002 return -ERESTARTNOHAND; 1003 } 1004 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ 1005 1006 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) 1007 { 1008 struct timex txc; 1009 int err, ret; 1010 1011 err = compat_get_timex(&txc, utp); 1012 if (err) 1013 return err; 1014 1015 ret = do_adjtimex(&txc); 1016 1017 err = compat_put_timex(utp, &txc); 1018 if (err) 1019 return err; 1020 1021 return ret; 1022 } 1023 1024 #ifdef CONFIG_NUMA 1025 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages, 1026 compat_uptr_t __user *pages32, 1027 const int __user *nodes, 1028 int __user *status, 1029 int flags) 1030 { 1031 const void __user * __user *pages; 1032 int i; 1033 1034 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1035 for (i = 0; i < nr_pages; i++) { 1036 compat_uptr_t p; 1037 1038 if (get_user(p, pages32 + i) || 1039 put_user(compat_ptr(p), pages + i)) 1040 return -EFAULT; 1041 } 1042 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1043 } 1044 1045 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, 1046 compat_ulong_t maxnode, 1047 const compat_ulong_t __user *old_nodes, 1048 const compat_ulong_t __user *new_nodes) 1049 { 1050 unsigned long __user *old = NULL; 1051 unsigned long __user *new = NULL; 1052 nodemask_t tmp_mask; 1053 unsigned long nr_bits; 1054 unsigned long size; 1055 1056 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1057 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1058 if (old_nodes) { 1059 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1060 return -EFAULT; 1061 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1062 if (new_nodes) 1063 new = old + size / sizeof(unsigned long); 1064 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1065 return -EFAULT; 1066 } 1067 if (new_nodes) { 1068 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1069 return -EFAULT; 1070 if (new == NULL) 1071 new = compat_alloc_user_space(size); 1072 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1073 return -EFAULT; 1074 } 1075 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1076 } 1077 #endif 1078 1079 struct compat_sysinfo { 1080 s32 uptime; 1081 u32 loads[3]; 1082 u32 totalram; 1083 u32 freeram; 1084 u32 sharedram; 1085 u32 bufferram; 1086 u32 totalswap; 1087 u32 freeswap; 1088 u16 procs; 1089 u16 pad; 1090 u32 totalhigh; 1091 u32 freehigh; 1092 u32 mem_unit; 1093 char _f[20-2*sizeof(u32)-sizeof(int)]; 1094 }; 1095 1096 asmlinkage long 1097 compat_sys_sysinfo(struct compat_sysinfo __user *info) 1098 { 1099 struct sysinfo s; 1100 1101 do_sysinfo(&s); 1102 1103 /* Check to see if any memory value is too large for 32-bit and scale 1104 * down if needed 1105 */ 1106 if ((s.totalram >> 32) || (s.totalswap >> 32)) { 1107 int bitcount = 0; 1108 1109 while (s.mem_unit < PAGE_SIZE) { 1110 s.mem_unit <<= 1; 1111 bitcount++; 1112 } 1113 1114 s.totalram >>= bitcount; 1115 s.freeram >>= bitcount; 1116 s.sharedram >>= bitcount; 1117 s.bufferram >>= bitcount; 1118 s.totalswap >>= bitcount; 1119 s.freeswap >>= bitcount; 1120 s.totalhigh >>= bitcount; 1121 s.freehigh >>= bitcount; 1122 } 1123 1124 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || 1125 __put_user (s.uptime, &info->uptime) || 1126 __put_user (s.loads[0], &info->loads[0]) || 1127 __put_user (s.loads[1], &info->loads[1]) || 1128 __put_user (s.loads[2], &info->loads[2]) || 1129 __put_user (s.totalram, &info->totalram) || 1130 __put_user (s.freeram, &info->freeram) || 1131 __put_user (s.sharedram, &info->sharedram) || 1132 __put_user (s.bufferram, &info->bufferram) || 1133 __put_user (s.totalswap, &info->totalswap) || 1134 __put_user (s.freeswap, &info->freeswap) || 1135 __put_user (s.procs, &info->procs) || 1136 __put_user (s.totalhigh, &info->totalhigh) || 1137 __put_user (s.freehigh, &info->freehigh) || 1138 __put_user (s.mem_unit, &info->mem_unit)) 1139 return -EFAULT; 1140 1141 return 0; 1142 } 1143 1144 /* 1145 * Allocate user-space memory for the duration of a single system call, 1146 * in order to marshall parameters inside a compat thunk. 1147 */ 1148 void __user *compat_alloc_user_space(unsigned long len) 1149 { 1150 void __user *ptr; 1151 1152 /* If len would occupy more than half of the entire compat space... */ 1153 if (unlikely(len > (((compat_uptr_t)~0) >> 1))) 1154 return NULL; 1155 1156 ptr = arch_compat_alloc_user_space(len); 1157 1158 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) 1159 return NULL; 1160 1161 return ptr; 1162 } 1163 EXPORT_SYMBOL_GPL(compat_alloc_user_space); 1164