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 } 161 162 static long compat_nanosleep_restart(struct restart_block *restart) 163 { 164 struct compat_timespec __user *rmtp; 165 struct timespec rmt; 166 mm_segment_t oldfs; 167 long ret; 168 169 restart->nanosleep.rmtp = (struct timespec __user *) &rmt; 170 oldfs = get_fs(); 171 set_fs(KERNEL_DS); 172 ret = hrtimer_nanosleep_restart(restart); 173 set_fs(oldfs); 174 175 if (ret) { 176 rmtp = restart->nanosleep.compat_rmtp; 177 178 if (rmtp && put_compat_timespec(&rmt, rmtp)) 179 return -EFAULT; 180 } 181 182 return ret; 183 } 184 185 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, 186 struct compat_timespec __user *rmtp) 187 { 188 struct timespec tu, rmt; 189 mm_segment_t oldfs; 190 long ret; 191 192 if (get_compat_timespec(&tu, rqtp)) 193 return -EFAULT; 194 195 if (!timespec_valid(&tu)) 196 return -EINVAL; 197 198 oldfs = get_fs(); 199 set_fs(KERNEL_DS); 200 ret = hrtimer_nanosleep(&tu, 201 rmtp ? (struct timespec __user *)&rmt : NULL, 202 HRTIMER_MODE_REL, CLOCK_MONOTONIC); 203 set_fs(oldfs); 204 205 if (ret) { 206 struct restart_block *restart 207 = ¤t_thread_info()->restart_block; 208 209 restart->fn = compat_nanosleep_restart; 210 restart->nanosleep.compat_rmtp = rmtp; 211 212 if (rmtp && put_compat_timespec(&rmt, rmtp)) 213 return -EFAULT; 214 } 215 216 return ret; 217 } 218 219 static inline long get_compat_itimerval(struct itimerval *o, 220 struct compat_itimerval __user *i) 221 { 222 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 223 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 224 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 225 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 226 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 227 } 228 229 static inline long put_compat_itimerval(struct compat_itimerval __user *o, 230 struct itimerval *i) 231 { 232 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 233 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 234 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 235 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 236 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 237 } 238 239 asmlinkage long compat_sys_getitimer(int which, 240 struct compat_itimerval __user *it) 241 { 242 struct itimerval kit; 243 int error; 244 245 error = do_getitimer(which, &kit); 246 if (!error && put_compat_itimerval(it, &kit)) 247 error = -EFAULT; 248 return error; 249 } 250 251 asmlinkage long compat_sys_setitimer(int which, 252 struct compat_itimerval __user *in, 253 struct compat_itimerval __user *out) 254 { 255 struct itimerval kin, kout; 256 int error; 257 258 if (in) { 259 if (get_compat_itimerval(&kin, in)) 260 return -EFAULT; 261 } else 262 memset(&kin, 0, sizeof(kin)); 263 264 error = do_setitimer(which, &kin, out ? &kout : NULL); 265 if (error || !out) 266 return error; 267 if (put_compat_itimerval(out, &kout)) 268 return -EFAULT; 269 return 0; 270 } 271 272 static compat_clock_t clock_t_to_compat_clock_t(clock_t x) 273 { 274 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); 275 } 276 277 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) 278 { 279 if (tbuf) { 280 struct tms tms; 281 struct compat_tms tmp; 282 283 do_sys_times(&tms); 284 /* Convert our struct tms to the compat version. */ 285 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); 286 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); 287 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); 288 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); 289 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 290 return -EFAULT; 291 } 292 force_successful_syscall_return(); 293 return compat_jiffies_to_clock_t(jiffies); 294 } 295 296 /* 297 * Assumption: old_sigset_t and compat_old_sigset_t are both 298 * types that can be passed to put_user()/get_user(). 299 */ 300 301 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) 302 { 303 old_sigset_t s; 304 long ret; 305 mm_segment_t old_fs = get_fs(); 306 307 set_fs(KERNEL_DS); 308 ret = sys_sigpending((old_sigset_t __user *) &s); 309 set_fs(old_fs); 310 if (ret == 0) 311 ret = put_user(s, set); 312 return ret; 313 } 314 315 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set, 316 compat_old_sigset_t __user *oset) 317 { 318 old_sigset_t s; 319 long ret; 320 mm_segment_t old_fs; 321 322 if (set && get_user(s, set)) 323 return -EFAULT; 324 old_fs = get_fs(); 325 set_fs(KERNEL_DS); 326 ret = sys_sigprocmask(how, 327 set ? (old_sigset_t __user *) &s : NULL, 328 oset ? (old_sigset_t __user *) &s : NULL); 329 set_fs(old_fs); 330 if (ret == 0) 331 if (oset) 332 ret = put_user(s, oset); 333 return ret; 334 } 335 336 asmlinkage long compat_sys_setrlimit(unsigned int resource, 337 struct compat_rlimit __user *rlim) 338 { 339 struct rlimit r; 340 341 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 342 __get_user(r.rlim_cur, &rlim->rlim_cur) || 343 __get_user(r.rlim_max, &rlim->rlim_max)) 344 return -EFAULT; 345 346 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 347 r.rlim_cur = RLIM_INFINITY; 348 if (r.rlim_max == COMPAT_RLIM_INFINITY) 349 r.rlim_max = RLIM_INFINITY; 350 return do_prlimit(current, resource, &r, NULL); 351 } 352 353 #ifdef COMPAT_RLIM_OLD_INFINITY 354 355 asmlinkage long compat_sys_old_getrlimit(unsigned int resource, 356 struct compat_rlimit __user *rlim) 357 { 358 struct rlimit r; 359 int ret; 360 mm_segment_t old_fs = get_fs(); 361 362 set_fs(KERNEL_DS); 363 ret = sys_old_getrlimit(resource, &r); 364 set_fs(old_fs); 365 366 if (!ret) { 367 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 368 r.rlim_cur = COMPAT_RLIM_INFINITY; 369 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 370 r.rlim_max = COMPAT_RLIM_INFINITY; 371 372 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 373 __put_user(r.rlim_cur, &rlim->rlim_cur) || 374 __put_user(r.rlim_max, &rlim->rlim_max)) 375 return -EFAULT; 376 } 377 return ret; 378 } 379 380 #endif 381 382 asmlinkage long compat_sys_getrlimit(unsigned int resource, 383 struct compat_rlimit __user *rlim) 384 { 385 struct rlimit r; 386 int ret; 387 388 ret = do_prlimit(current, resource, NULL, &r); 389 if (!ret) { 390 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 391 r.rlim_cur = COMPAT_RLIM_INFINITY; 392 if (r.rlim_max > COMPAT_RLIM_INFINITY) 393 r.rlim_max = COMPAT_RLIM_INFINITY; 394 395 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 396 __put_user(r.rlim_cur, &rlim->rlim_cur) || 397 __put_user(r.rlim_max, &rlim->rlim_max)) 398 return -EFAULT; 399 } 400 return ret; 401 } 402 403 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 404 { 405 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 406 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 407 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 408 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 409 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 410 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 411 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 412 __put_user(r->ru_idrss, &ru->ru_idrss) || 413 __put_user(r->ru_isrss, &ru->ru_isrss) || 414 __put_user(r->ru_minflt, &ru->ru_minflt) || 415 __put_user(r->ru_majflt, &ru->ru_majflt) || 416 __put_user(r->ru_nswap, &ru->ru_nswap) || 417 __put_user(r->ru_inblock, &ru->ru_inblock) || 418 __put_user(r->ru_oublock, &ru->ru_oublock) || 419 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 420 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 421 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 422 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 423 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 424 return -EFAULT; 425 return 0; 426 } 427 428 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) 429 { 430 struct rusage r; 431 int ret; 432 mm_segment_t old_fs = get_fs(); 433 434 set_fs(KERNEL_DS); 435 ret = sys_getrusage(who, (struct rusage __user *) &r); 436 set_fs(old_fs); 437 438 if (ret) 439 return ret; 440 441 if (put_compat_rusage(&r, ru)) 442 return -EFAULT; 443 444 return 0; 445 } 446 447 asmlinkage long 448 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, 449 struct compat_rusage __user *ru) 450 { 451 if (!ru) { 452 return sys_wait4(pid, stat_addr, options, NULL); 453 } else { 454 struct rusage r; 455 int ret; 456 unsigned int status; 457 mm_segment_t old_fs = get_fs(); 458 459 set_fs (KERNEL_DS); 460 ret = sys_wait4(pid, 461 (stat_addr ? 462 (unsigned int __user *) &status : NULL), 463 options, (struct rusage __user *) &r); 464 set_fs (old_fs); 465 466 if (ret > 0) { 467 if (put_compat_rusage(&r, ru)) 468 return -EFAULT; 469 if (stat_addr && put_user(status, stat_addr)) 470 return -EFAULT; 471 } 472 return ret; 473 } 474 } 475 476 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, 477 struct compat_siginfo __user *uinfo, int options, 478 struct compat_rusage __user *uru) 479 { 480 siginfo_t info; 481 struct rusage ru; 482 long ret; 483 mm_segment_t old_fs = get_fs(); 484 485 memset(&info, 0, sizeof(info)); 486 487 set_fs(KERNEL_DS); 488 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 489 uru ? (struct rusage __user *)&ru : NULL); 490 set_fs(old_fs); 491 492 if ((ret < 0) || (info.si_signo == 0)) 493 return ret; 494 495 if (uru) { 496 ret = put_compat_rusage(&ru, uru); 497 if (ret) 498 return ret; 499 } 500 501 BUG_ON(info.si_code & __SI_MASK); 502 info.si_code |= __SI_CHLD; 503 return copy_siginfo_to_user32(uinfo, &info); 504 } 505 506 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 507 unsigned len, struct cpumask *new_mask) 508 { 509 unsigned long *k; 510 511 if (len < cpumask_size()) 512 memset(new_mask, 0, cpumask_size()); 513 else if (len > cpumask_size()) 514 len = cpumask_size(); 515 516 k = cpumask_bits(new_mask); 517 return compat_get_bitmap(k, user_mask_ptr, len * 8); 518 } 519 520 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 521 unsigned int len, 522 compat_ulong_t __user *user_mask_ptr) 523 { 524 cpumask_var_t new_mask; 525 int retval; 526 527 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 528 return -ENOMEM; 529 530 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 531 if (retval) 532 goto out; 533 534 retval = sched_setaffinity(pid, new_mask); 535 out: 536 free_cpumask_var(new_mask); 537 return retval; 538 } 539 540 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 541 compat_ulong_t __user *user_mask_ptr) 542 { 543 int ret; 544 cpumask_var_t mask; 545 546 if ((len * BITS_PER_BYTE) < nr_cpu_ids) 547 return -EINVAL; 548 if (len & (sizeof(compat_ulong_t)-1)) 549 return -EINVAL; 550 551 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 552 return -ENOMEM; 553 554 ret = sched_getaffinity(pid, mask); 555 if (ret == 0) { 556 size_t retlen = min_t(size_t, len, cpumask_size()); 557 558 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) 559 ret = -EFAULT; 560 else 561 ret = retlen; 562 } 563 free_cpumask_var(mask); 564 565 return ret; 566 } 567 568 int get_compat_itimerspec(struct itimerspec *dst, 569 const struct compat_itimerspec __user *src) 570 { 571 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 572 get_compat_timespec(&dst->it_value, &src->it_value)) 573 return -EFAULT; 574 return 0; 575 } 576 577 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 578 const struct itimerspec *src) 579 { 580 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 581 put_compat_timespec(&src->it_value, &dst->it_value)) 582 return -EFAULT; 583 return 0; 584 } 585 586 long compat_sys_timer_create(clockid_t which_clock, 587 struct compat_sigevent __user *timer_event_spec, 588 timer_t __user *created_timer_id) 589 { 590 struct sigevent __user *event = NULL; 591 592 if (timer_event_spec) { 593 struct sigevent kevent; 594 595 event = compat_alloc_user_space(sizeof(*event)); 596 if (get_compat_sigevent(&kevent, timer_event_spec) || 597 copy_to_user(event, &kevent, sizeof(*event))) 598 return -EFAULT; 599 } 600 601 return sys_timer_create(which_clock, event, created_timer_id); 602 } 603 604 long compat_sys_timer_settime(timer_t timer_id, int flags, 605 struct compat_itimerspec __user *new, 606 struct compat_itimerspec __user *old) 607 { 608 long err; 609 mm_segment_t oldfs; 610 struct itimerspec newts, oldts; 611 612 if (!new) 613 return -EINVAL; 614 if (get_compat_itimerspec(&newts, new)) 615 return -EFAULT; 616 oldfs = get_fs(); 617 set_fs(KERNEL_DS); 618 err = sys_timer_settime(timer_id, flags, 619 (struct itimerspec __user *) &newts, 620 (struct itimerspec __user *) &oldts); 621 set_fs(oldfs); 622 if (!err && old && put_compat_itimerspec(old, &oldts)) 623 return -EFAULT; 624 return err; 625 } 626 627 long compat_sys_timer_gettime(timer_t timer_id, 628 struct compat_itimerspec __user *setting) 629 { 630 long err; 631 mm_segment_t oldfs; 632 struct itimerspec ts; 633 634 oldfs = get_fs(); 635 set_fs(KERNEL_DS); 636 err = sys_timer_gettime(timer_id, 637 (struct itimerspec __user *) &ts); 638 set_fs(oldfs); 639 if (!err && put_compat_itimerspec(setting, &ts)) 640 return -EFAULT; 641 return err; 642 } 643 644 long compat_sys_clock_settime(clockid_t which_clock, 645 struct compat_timespec __user *tp) 646 { 647 long err; 648 mm_segment_t oldfs; 649 struct timespec ts; 650 651 if (get_compat_timespec(&ts, tp)) 652 return -EFAULT; 653 oldfs = get_fs(); 654 set_fs(KERNEL_DS); 655 err = sys_clock_settime(which_clock, 656 (struct timespec __user *) &ts); 657 set_fs(oldfs); 658 return err; 659 } 660 661 long compat_sys_clock_gettime(clockid_t which_clock, 662 struct compat_timespec __user *tp) 663 { 664 long err; 665 mm_segment_t oldfs; 666 struct timespec ts; 667 668 oldfs = get_fs(); 669 set_fs(KERNEL_DS); 670 err = sys_clock_gettime(which_clock, 671 (struct timespec __user *) &ts); 672 set_fs(oldfs); 673 if (!err && put_compat_timespec(&ts, tp)) 674 return -EFAULT; 675 return err; 676 } 677 678 long compat_sys_clock_adjtime(clockid_t which_clock, 679 struct compat_timex __user *utp) 680 { 681 struct timex txc; 682 mm_segment_t oldfs; 683 int err, ret; 684 685 err = compat_get_timex(&txc, utp); 686 if (err) 687 return err; 688 689 oldfs = get_fs(); 690 set_fs(KERNEL_DS); 691 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc); 692 set_fs(oldfs); 693 694 err = compat_put_timex(utp, &txc); 695 if (err) 696 return err; 697 698 return ret; 699 } 700 701 long compat_sys_clock_getres(clockid_t which_clock, 702 struct compat_timespec __user *tp) 703 { 704 long err; 705 mm_segment_t oldfs; 706 struct timespec ts; 707 708 oldfs = get_fs(); 709 set_fs(KERNEL_DS); 710 err = sys_clock_getres(which_clock, 711 (struct timespec __user *) &ts); 712 set_fs(oldfs); 713 if (!err && tp && put_compat_timespec(&ts, tp)) 714 return -EFAULT; 715 return err; 716 } 717 718 static long compat_clock_nanosleep_restart(struct restart_block *restart) 719 { 720 long err; 721 mm_segment_t oldfs; 722 struct timespec tu; 723 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp; 724 725 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 726 oldfs = get_fs(); 727 set_fs(KERNEL_DS); 728 err = clock_nanosleep_restart(restart); 729 set_fs(oldfs); 730 731 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 732 put_compat_timespec(&tu, rmtp)) 733 return -EFAULT; 734 735 if (err == -ERESTART_RESTARTBLOCK) { 736 restart->fn = compat_clock_nanosleep_restart; 737 restart->nanosleep.compat_rmtp = rmtp; 738 } 739 return err; 740 } 741 742 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 743 struct compat_timespec __user *rqtp, 744 struct compat_timespec __user *rmtp) 745 { 746 long err; 747 mm_segment_t oldfs; 748 struct timespec in, out; 749 struct restart_block *restart; 750 751 if (get_compat_timespec(&in, rqtp)) 752 return -EFAULT; 753 754 oldfs = get_fs(); 755 set_fs(KERNEL_DS); 756 err = sys_clock_nanosleep(which_clock, flags, 757 (struct timespec __user *) &in, 758 (struct timespec __user *) &out); 759 set_fs(oldfs); 760 761 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 762 put_compat_timespec(&out, rmtp)) 763 return -EFAULT; 764 765 if (err == -ERESTART_RESTARTBLOCK) { 766 restart = ¤t_thread_info()->restart_block; 767 restart->fn = compat_clock_nanosleep_restart; 768 restart->nanosleep.compat_rmtp = rmtp; 769 } 770 return err; 771 } 772 773 /* 774 * We currently only need the following fields from the sigevent 775 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 776 * sigev_notify_thread_id). The others are handled in user mode. 777 * We also assume that copying sigev_value.sival_int is sufficient 778 * to keep all the bits of sigev_value.sival_ptr intact. 779 */ 780 int get_compat_sigevent(struct sigevent *event, 781 const struct compat_sigevent __user *u_event) 782 { 783 memset(event, 0, sizeof(*event)); 784 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 785 __get_user(event->sigev_value.sival_int, 786 &u_event->sigev_value.sival_int) || 787 __get_user(event->sigev_signo, &u_event->sigev_signo) || 788 __get_user(event->sigev_notify, &u_event->sigev_notify) || 789 __get_user(event->sigev_notify_thread_id, 790 &u_event->sigev_notify_thread_id)) 791 ? -EFAULT : 0; 792 } 793 794 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 795 unsigned long bitmap_size) 796 { 797 int i, j; 798 unsigned long m; 799 compat_ulong_t um; 800 unsigned long nr_compat_longs; 801 802 /* align bitmap up to nearest compat_long_t boundary */ 803 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 804 805 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 806 return -EFAULT; 807 808 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 809 810 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 811 m = 0; 812 813 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 814 /* 815 * We dont want to read past the end of the userspace 816 * bitmap. We must however ensure the end of the 817 * kernel bitmap is zeroed. 818 */ 819 if (nr_compat_longs-- > 0) { 820 if (__get_user(um, umask)) 821 return -EFAULT; 822 } else { 823 um = 0; 824 } 825 826 umask++; 827 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 828 } 829 *mask++ = m; 830 } 831 832 return 0; 833 } 834 835 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 836 unsigned long bitmap_size) 837 { 838 int i, j; 839 unsigned long m; 840 compat_ulong_t um; 841 unsigned long nr_compat_longs; 842 843 /* align bitmap up to nearest compat_long_t boundary */ 844 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 845 846 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 847 return -EFAULT; 848 849 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 850 851 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 852 m = *mask++; 853 854 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 855 um = m; 856 857 /* 858 * We dont want to write past the end of the userspace 859 * bitmap. 860 */ 861 if (nr_compat_longs-- > 0) { 862 if (__put_user(um, umask)) 863 return -EFAULT; 864 } 865 866 umask++; 867 m >>= 4*sizeof(um); 868 m >>= 4*sizeof(um); 869 } 870 } 871 872 return 0; 873 } 874 875 void 876 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 877 { 878 switch (_NSIG_WORDS) { 879 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 880 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 881 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 882 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 883 } 884 } 885 886 asmlinkage long 887 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 888 struct compat_siginfo __user *uinfo, 889 struct compat_timespec __user *uts, compat_size_t sigsetsize) 890 { 891 compat_sigset_t s32; 892 sigset_t s; 893 int sig; 894 struct timespec t; 895 siginfo_t info; 896 long ret, timeout = 0; 897 898 if (sigsetsize != sizeof(sigset_t)) 899 return -EINVAL; 900 901 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 902 return -EFAULT; 903 sigset_from_compat(&s, &s32); 904 sigdelsetmask(&s,sigmask(SIGKILL)|sigmask(SIGSTOP)); 905 signotset(&s); 906 907 if (uts) { 908 if (get_compat_timespec (&t, uts)) 909 return -EFAULT; 910 if (t.tv_nsec >= 1000000000L || t.tv_nsec < 0 911 || t.tv_sec < 0) 912 return -EINVAL; 913 } 914 915 spin_lock_irq(¤t->sighand->siglock); 916 sig = dequeue_signal(current, &s, &info); 917 if (!sig) { 918 timeout = MAX_SCHEDULE_TIMEOUT; 919 if (uts) 920 timeout = timespec_to_jiffies(&t) 921 +(t.tv_sec || t.tv_nsec); 922 if (timeout) { 923 current->real_blocked = current->blocked; 924 sigandsets(¤t->blocked, ¤t->blocked, &s); 925 926 recalc_sigpending(); 927 spin_unlock_irq(¤t->sighand->siglock); 928 929 timeout = schedule_timeout_interruptible(timeout); 930 931 spin_lock_irq(¤t->sighand->siglock); 932 sig = dequeue_signal(current, &s, &info); 933 current->blocked = current->real_blocked; 934 siginitset(¤t->real_blocked, 0); 935 recalc_sigpending(); 936 } 937 } 938 spin_unlock_irq(¤t->sighand->siglock); 939 940 if (sig) { 941 ret = sig; 942 if (uinfo) { 943 if (copy_siginfo_to_user32(uinfo, &info)) 944 ret = -EFAULT; 945 } 946 }else { 947 ret = timeout?-EINTR:-EAGAIN; 948 } 949 return ret; 950 951 } 952 953 asmlinkage long 954 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig, 955 struct compat_siginfo __user *uinfo) 956 { 957 siginfo_t info; 958 959 if (copy_siginfo_from_user32(&info, uinfo)) 960 return -EFAULT; 961 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info); 962 } 963 964 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 965 966 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 967 968 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 969 { 970 compat_time_t i; 971 struct timeval tv; 972 973 do_gettimeofday(&tv); 974 i = tv.tv_sec; 975 976 if (tloc) { 977 if (put_user(i,tloc)) 978 return -EFAULT; 979 } 980 force_successful_syscall_return(); 981 return i; 982 } 983 984 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 985 { 986 struct timespec tv; 987 int err; 988 989 if (get_user(tv.tv_sec, tptr)) 990 return -EFAULT; 991 992 tv.tv_nsec = 0; 993 994 err = security_settime(&tv, NULL); 995 if (err) 996 return err; 997 998 do_settimeofday(&tv); 999 return 0; 1000 } 1001 1002 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 1003 1004 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND 1005 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) 1006 { 1007 sigset_t newset; 1008 compat_sigset_t newset32; 1009 1010 /* XXX: Don't preclude handling different sized sigset_t's. */ 1011 if (sigsetsize != sizeof(sigset_t)) 1012 return -EINVAL; 1013 1014 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) 1015 return -EFAULT; 1016 sigset_from_compat(&newset, &newset32); 1017 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 1018 1019 spin_lock_irq(¤t->sighand->siglock); 1020 current->saved_sigmask = current->blocked; 1021 current->blocked = newset; 1022 recalc_sigpending(); 1023 spin_unlock_irq(¤t->sighand->siglock); 1024 1025 current->state = TASK_INTERRUPTIBLE; 1026 schedule(); 1027 set_restore_sigmask(); 1028 return -ERESTARTNOHAND; 1029 } 1030 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ 1031 1032 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) 1033 { 1034 struct timex txc; 1035 int err, ret; 1036 1037 err = compat_get_timex(&txc, utp); 1038 if (err) 1039 return err; 1040 1041 ret = do_adjtimex(&txc); 1042 1043 err = compat_put_timex(utp, &txc); 1044 if (err) 1045 return err; 1046 1047 return ret; 1048 } 1049 1050 #ifdef CONFIG_NUMA 1051 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages, 1052 compat_uptr_t __user *pages32, 1053 const int __user *nodes, 1054 int __user *status, 1055 int flags) 1056 { 1057 const void __user * __user *pages; 1058 int i; 1059 1060 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1061 for (i = 0; i < nr_pages; i++) { 1062 compat_uptr_t p; 1063 1064 if (get_user(p, pages32 + i) || 1065 put_user(compat_ptr(p), pages + i)) 1066 return -EFAULT; 1067 } 1068 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1069 } 1070 1071 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, 1072 compat_ulong_t maxnode, 1073 const compat_ulong_t __user *old_nodes, 1074 const compat_ulong_t __user *new_nodes) 1075 { 1076 unsigned long __user *old = NULL; 1077 unsigned long __user *new = NULL; 1078 nodemask_t tmp_mask; 1079 unsigned long nr_bits; 1080 unsigned long size; 1081 1082 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1083 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1084 if (old_nodes) { 1085 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1086 return -EFAULT; 1087 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1088 if (new_nodes) 1089 new = old + size / sizeof(unsigned long); 1090 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1091 return -EFAULT; 1092 } 1093 if (new_nodes) { 1094 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1095 return -EFAULT; 1096 if (new == NULL) 1097 new = compat_alloc_user_space(size); 1098 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1099 return -EFAULT; 1100 } 1101 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1102 } 1103 #endif 1104 1105 struct compat_sysinfo { 1106 s32 uptime; 1107 u32 loads[3]; 1108 u32 totalram; 1109 u32 freeram; 1110 u32 sharedram; 1111 u32 bufferram; 1112 u32 totalswap; 1113 u32 freeswap; 1114 u16 procs; 1115 u16 pad; 1116 u32 totalhigh; 1117 u32 freehigh; 1118 u32 mem_unit; 1119 char _f[20-2*sizeof(u32)-sizeof(int)]; 1120 }; 1121 1122 asmlinkage long 1123 compat_sys_sysinfo(struct compat_sysinfo __user *info) 1124 { 1125 struct sysinfo s; 1126 1127 do_sysinfo(&s); 1128 1129 /* Check to see if any memory value is too large for 32-bit and scale 1130 * down if needed 1131 */ 1132 if ((s.totalram >> 32) || (s.totalswap >> 32)) { 1133 int bitcount = 0; 1134 1135 while (s.mem_unit < PAGE_SIZE) { 1136 s.mem_unit <<= 1; 1137 bitcount++; 1138 } 1139 1140 s.totalram >>= bitcount; 1141 s.freeram >>= bitcount; 1142 s.sharedram >>= bitcount; 1143 s.bufferram >>= bitcount; 1144 s.totalswap >>= bitcount; 1145 s.freeswap >>= bitcount; 1146 s.totalhigh >>= bitcount; 1147 s.freehigh >>= bitcount; 1148 } 1149 1150 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || 1151 __put_user (s.uptime, &info->uptime) || 1152 __put_user (s.loads[0], &info->loads[0]) || 1153 __put_user (s.loads[1], &info->loads[1]) || 1154 __put_user (s.loads[2], &info->loads[2]) || 1155 __put_user (s.totalram, &info->totalram) || 1156 __put_user (s.freeram, &info->freeram) || 1157 __put_user (s.sharedram, &info->sharedram) || 1158 __put_user (s.bufferram, &info->bufferram) || 1159 __put_user (s.totalswap, &info->totalswap) || 1160 __put_user (s.freeswap, &info->freeswap) || 1161 __put_user (s.procs, &info->procs) || 1162 __put_user (s.totalhigh, &info->totalhigh) || 1163 __put_user (s.freehigh, &info->freehigh) || 1164 __put_user (s.mem_unit, &info->mem_unit)) 1165 return -EFAULT; 1166 1167 return 0; 1168 } 1169 1170 /* 1171 * Allocate user-space memory for the duration of a single system call, 1172 * in order to marshall parameters inside a compat thunk. 1173 */ 1174 void __user *compat_alloc_user_space(unsigned long len) 1175 { 1176 void __user *ptr; 1177 1178 /* If len would occupy more than half of the entire compat space... */ 1179 if (unlikely(len > (((compat_uptr_t)~0) >> 1))) 1180 return NULL; 1181 1182 ptr = arch_compat_alloc_user_space(len); 1183 1184 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) 1185 return NULL; 1186 1187 return ptr; 1188 } 1189 EXPORT_SYMBOL_GPL(compat_alloc_user_space); 1190