1 /* 2 * linux/kernel/compat.c 3 * 4 * Kernel compatibililty routines for e.g. 32 bit syscall support 5 * on 64 bit kernels. 6 * 7 * Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/linkage.h> 15 #include <linux/compat.h> 16 #include <linux/errno.h> 17 #include <linux/time.h> 18 #include <linux/signal.h> 19 #include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */ 20 #include <linux/syscalls.h> 21 #include <linux/unistd.h> 22 #include <linux/security.h> 23 #include <linux/timex.h> 24 #include <linux/export.h> 25 #include <linux/migrate.h> 26 #include <linux/posix-timers.h> 27 #include <linux/times.h> 28 #include <linux/ptrace.h> 29 #include <linux/gfp.h> 30 31 #include <asm/uaccess.h> 32 33 /* 34 * Get/set struct timeval with struct timespec on the native side 35 */ 36 static int compat_get_timeval_convert(struct timespec *o, 37 struct compat_timeval __user *i) 38 { 39 long usec; 40 41 if (get_user(o->tv_sec, &i->tv_sec) || 42 get_user(usec, &i->tv_usec)) 43 return -EFAULT; 44 o->tv_nsec = usec * 1000; 45 return 0; 46 } 47 48 static int compat_put_timeval_convert(struct compat_timeval __user *o, 49 struct timeval *i) 50 { 51 return (put_user(i->tv_sec, &o->tv_sec) || 52 put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0; 53 } 54 55 static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp) 56 { 57 memset(txc, 0, sizeof(struct timex)); 58 59 if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) || 60 __get_user(txc->modes, &utp->modes) || 61 __get_user(txc->offset, &utp->offset) || 62 __get_user(txc->freq, &utp->freq) || 63 __get_user(txc->maxerror, &utp->maxerror) || 64 __get_user(txc->esterror, &utp->esterror) || 65 __get_user(txc->status, &utp->status) || 66 __get_user(txc->constant, &utp->constant) || 67 __get_user(txc->precision, &utp->precision) || 68 __get_user(txc->tolerance, &utp->tolerance) || 69 __get_user(txc->time.tv_sec, &utp->time.tv_sec) || 70 __get_user(txc->time.tv_usec, &utp->time.tv_usec) || 71 __get_user(txc->tick, &utp->tick) || 72 __get_user(txc->ppsfreq, &utp->ppsfreq) || 73 __get_user(txc->jitter, &utp->jitter) || 74 __get_user(txc->shift, &utp->shift) || 75 __get_user(txc->stabil, &utp->stabil) || 76 __get_user(txc->jitcnt, &utp->jitcnt) || 77 __get_user(txc->calcnt, &utp->calcnt) || 78 __get_user(txc->errcnt, &utp->errcnt) || 79 __get_user(txc->stbcnt, &utp->stbcnt)) 80 return -EFAULT; 81 82 return 0; 83 } 84 85 static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc) 86 { 87 if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) || 88 __put_user(txc->modes, &utp->modes) || 89 __put_user(txc->offset, &utp->offset) || 90 __put_user(txc->freq, &utp->freq) || 91 __put_user(txc->maxerror, &utp->maxerror) || 92 __put_user(txc->esterror, &utp->esterror) || 93 __put_user(txc->status, &utp->status) || 94 __put_user(txc->constant, &utp->constant) || 95 __put_user(txc->precision, &utp->precision) || 96 __put_user(txc->tolerance, &utp->tolerance) || 97 __put_user(txc->time.tv_sec, &utp->time.tv_sec) || 98 __put_user(txc->time.tv_usec, &utp->time.tv_usec) || 99 __put_user(txc->tick, &utp->tick) || 100 __put_user(txc->ppsfreq, &utp->ppsfreq) || 101 __put_user(txc->jitter, &utp->jitter) || 102 __put_user(txc->shift, &utp->shift) || 103 __put_user(txc->stabil, &utp->stabil) || 104 __put_user(txc->jitcnt, &utp->jitcnt) || 105 __put_user(txc->calcnt, &utp->calcnt) || 106 __put_user(txc->errcnt, &utp->errcnt) || 107 __put_user(txc->stbcnt, &utp->stbcnt) || 108 __put_user(txc->tai, &utp->tai)) 109 return -EFAULT; 110 return 0; 111 } 112 113 asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv, 114 struct timezone __user *tz) 115 { 116 if (tv) { 117 struct timeval ktv; 118 do_gettimeofday(&ktv); 119 if (compat_put_timeval_convert(tv, &ktv)) 120 return -EFAULT; 121 } 122 if (tz) { 123 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) 124 return -EFAULT; 125 } 126 127 return 0; 128 } 129 130 asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv, 131 struct timezone __user *tz) 132 { 133 struct timespec kts; 134 struct timezone ktz; 135 136 if (tv) { 137 if (compat_get_timeval_convert(&kts, tv)) 138 return -EFAULT; 139 } 140 if (tz) { 141 if (copy_from_user(&ktz, tz, sizeof(ktz))) 142 return -EFAULT; 143 } 144 145 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL); 146 } 147 148 int get_compat_timeval(struct timeval *tv, const struct compat_timeval __user *ctv) 149 { 150 return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) || 151 __get_user(tv->tv_sec, &ctv->tv_sec) || 152 __get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; 153 } 154 EXPORT_SYMBOL_GPL(get_compat_timeval); 155 156 int put_compat_timeval(const struct timeval *tv, struct compat_timeval __user *ctv) 157 { 158 return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) || 159 __put_user(tv->tv_sec, &ctv->tv_sec) || 160 __put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0; 161 } 162 EXPORT_SYMBOL_GPL(put_compat_timeval); 163 164 int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts) 165 { 166 return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) || 167 __get_user(ts->tv_sec, &cts->tv_sec) || 168 __get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 169 } 170 EXPORT_SYMBOL_GPL(get_compat_timespec); 171 172 int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts) 173 { 174 return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) || 175 __put_user(ts->tv_sec, &cts->tv_sec) || 176 __put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0; 177 } 178 EXPORT_SYMBOL_GPL(put_compat_timespec); 179 180 int compat_get_timeval(struct timeval *tv, const void __user *utv) 181 { 182 if (COMPAT_USE_64BIT_TIME) 183 return copy_from_user(tv, utv, sizeof *tv) ? -EFAULT : 0; 184 else 185 return get_compat_timeval(tv, utv); 186 } 187 EXPORT_SYMBOL_GPL(compat_get_timeval); 188 189 int compat_put_timeval(const struct timeval *tv, void __user *utv) 190 { 191 if (COMPAT_USE_64BIT_TIME) 192 return copy_to_user(utv, tv, sizeof *tv) ? -EFAULT : 0; 193 else 194 return put_compat_timeval(tv, utv); 195 } 196 EXPORT_SYMBOL_GPL(compat_put_timeval); 197 198 int compat_get_timespec(struct timespec *ts, const void __user *uts) 199 { 200 if (COMPAT_USE_64BIT_TIME) 201 return copy_from_user(ts, uts, sizeof *ts) ? -EFAULT : 0; 202 else 203 return get_compat_timespec(ts, uts); 204 } 205 EXPORT_SYMBOL_GPL(compat_get_timespec); 206 207 int compat_put_timespec(const struct timespec *ts, void __user *uts) 208 { 209 if (COMPAT_USE_64BIT_TIME) 210 return copy_to_user(uts, ts, sizeof *ts) ? -EFAULT : 0; 211 else 212 return put_compat_timespec(ts, uts); 213 } 214 EXPORT_SYMBOL_GPL(compat_put_timespec); 215 216 static long compat_nanosleep_restart(struct restart_block *restart) 217 { 218 struct compat_timespec __user *rmtp; 219 struct timespec rmt; 220 mm_segment_t oldfs; 221 long ret; 222 223 restart->nanosleep.rmtp = (struct timespec __user *) &rmt; 224 oldfs = get_fs(); 225 set_fs(KERNEL_DS); 226 ret = hrtimer_nanosleep_restart(restart); 227 set_fs(oldfs); 228 229 if (ret) { 230 rmtp = restart->nanosleep.compat_rmtp; 231 232 if (rmtp && put_compat_timespec(&rmt, rmtp)) 233 return -EFAULT; 234 } 235 236 return ret; 237 } 238 239 asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp, 240 struct compat_timespec __user *rmtp) 241 { 242 struct timespec tu, rmt; 243 mm_segment_t oldfs; 244 long ret; 245 246 if (get_compat_timespec(&tu, rqtp)) 247 return -EFAULT; 248 249 if (!timespec_valid(&tu)) 250 return -EINVAL; 251 252 oldfs = get_fs(); 253 set_fs(KERNEL_DS); 254 ret = hrtimer_nanosleep(&tu, 255 rmtp ? (struct timespec __user *)&rmt : NULL, 256 HRTIMER_MODE_REL, CLOCK_MONOTONIC); 257 set_fs(oldfs); 258 259 if (ret) { 260 struct restart_block *restart 261 = ¤t_thread_info()->restart_block; 262 263 restart->fn = compat_nanosleep_restart; 264 restart->nanosleep.compat_rmtp = rmtp; 265 266 if (rmtp && put_compat_timespec(&rmt, rmtp)) 267 return -EFAULT; 268 } 269 270 return ret; 271 } 272 273 static inline long get_compat_itimerval(struct itimerval *o, 274 struct compat_itimerval __user *i) 275 { 276 return (!access_ok(VERIFY_READ, i, sizeof(*i)) || 277 (__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) | 278 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) | 279 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) | 280 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec))); 281 } 282 283 static inline long put_compat_itimerval(struct compat_itimerval __user *o, 284 struct itimerval *i) 285 { 286 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 287 (__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) | 288 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) | 289 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) | 290 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec))); 291 } 292 293 asmlinkage long compat_sys_getitimer(int which, 294 struct compat_itimerval __user *it) 295 { 296 struct itimerval kit; 297 int error; 298 299 error = do_getitimer(which, &kit); 300 if (!error && put_compat_itimerval(it, &kit)) 301 error = -EFAULT; 302 return error; 303 } 304 305 asmlinkage long compat_sys_setitimer(int which, 306 struct compat_itimerval __user *in, 307 struct compat_itimerval __user *out) 308 { 309 struct itimerval kin, kout; 310 int error; 311 312 if (in) { 313 if (get_compat_itimerval(&kin, in)) 314 return -EFAULT; 315 } else 316 memset(&kin, 0, sizeof(kin)); 317 318 error = do_setitimer(which, &kin, out ? &kout : NULL); 319 if (error || !out) 320 return error; 321 if (put_compat_itimerval(out, &kout)) 322 return -EFAULT; 323 return 0; 324 } 325 326 static compat_clock_t clock_t_to_compat_clock_t(clock_t x) 327 { 328 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); 329 } 330 331 asmlinkage long compat_sys_times(struct compat_tms __user *tbuf) 332 { 333 if (tbuf) { 334 struct tms tms; 335 struct compat_tms tmp; 336 337 do_sys_times(&tms); 338 /* Convert our struct tms to the compat version. */ 339 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); 340 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); 341 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); 342 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); 343 if (copy_to_user(tbuf, &tmp, sizeof(tmp))) 344 return -EFAULT; 345 } 346 force_successful_syscall_return(); 347 return compat_jiffies_to_clock_t(jiffies); 348 } 349 350 #ifdef __ARCH_WANT_SYS_SIGPENDING 351 352 /* 353 * Assumption: old_sigset_t and compat_old_sigset_t are both 354 * types that can be passed to put_user()/get_user(). 355 */ 356 357 asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set) 358 { 359 old_sigset_t s; 360 long ret; 361 mm_segment_t old_fs = get_fs(); 362 363 set_fs(KERNEL_DS); 364 ret = sys_sigpending((old_sigset_t __user *) &s); 365 set_fs(old_fs); 366 if (ret == 0) 367 ret = put_user(s, set); 368 return ret; 369 } 370 371 #endif 372 373 #ifdef __ARCH_WANT_SYS_SIGPROCMASK 374 375 asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set, 376 compat_old_sigset_t __user *oset) 377 { 378 old_sigset_t s; 379 long ret; 380 mm_segment_t old_fs; 381 382 if (set && get_user(s, set)) 383 return -EFAULT; 384 old_fs = get_fs(); 385 set_fs(KERNEL_DS); 386 ret = sys_sigprocmask(how, 387 set ? (old_sigset_t __user *) &s : NULL, 388 oset ? (old_sigset_t __user *) &s : NULL); 389 set_fs(old_fs); 390 if (ret == 0) 391 if (oset) 392 ret = put_user(s, oset); 393 return ret; 394 } 395 396 #endif 397 398 asmlinkage long compat_sys_setrlimit(unsigned int resource, 399 struct compat_rlimit __user *rlim) 400 { 401 struct rlimit r; 402 403 if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) || 404 __get_user(r.rlim_cur, &rlim->rlim_cur) || 405 __get_user(r.rlim_max, &rlim->rlim_max)) 406 return -EFAULT; 407 408 if (r.rlim_cur == COMPAT_RLIM_INFINITY) 409 r.rlim_cur = RLIM_INFINITY; 410 if (r.rlim_max == COMPAT_RLIM_INFINITY) 411 r.rlim_max = RLIM_INFINITY; 412 return do_prlimit(current, resource, &r, NULL); 413 } 414 415 #ifdef COMPAT_RLIM_OLD_INFINITY 416 417 asmlinkage long compat_sys_old_getrlimit(unsigned int resource, 418 struct compat_rlimit __user *rlim) 419 { 420 struct rlimit r; 421 int ret; 422 mm_segment_t old_fs = get_fs(); 423 424 set_fs(KERNEL_DS); 425 ret = sys_old_getrlimit(resource, &r); 426 set_fs(old_fs); 427 428 if (!ret) { 429 if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY) 430 r.rlim_cur = COMPAT_RLIM_INFINITY; 431 if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY) 432 r.rlim_max = COMPAT_RLIM_INFINITY; 433 434 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 435 __put_user(r.rlim_cur, &rlim->rlim_cur) || 436 __put_user(r.rlim_max, &rlim->rlim_max)) 437 return -EFAULT; 438 } 439 return ret; 440 } 441 442 #endif 443 444 asmlinkage long compat_sys_getrlimit(unsigned int resource, 445 struct compat_rlimit __user *rlim) 446 { 447 struct rlimit r; 448 int ret; 449 450 ret = do_prlimit(current, resource, NULL, &r); 451 if (!ret) { 452 if (r.rlim_cur > COMPAT_RLIM_INFINITY) 453 r.rlim_cur = COMPAT_RLIM_INFINITY; 454 if (r.rlim_max > COMPAT_RLIM_INFINITY) 455 r.rlim_max = COMPAT_RLIM_INFINITY; 456 457 if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) || 458 __put_user(r.rlim_cur, &rlim->rlim_cur) || 459 __put_user(r.rlim_max, &rlim->rlim_max)) 460 return -EFAULT; 461 } 462 return ret; 463 } 464 465 int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru) 466 { 467 if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) || 468 __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) || 469 __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) || 470 __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) || 471 __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) || 472 __put_user(r->ru_maxrss, &ru->ru_maxrss) || 473 __put_user(r->ru_ixrss, &ru->ru_ixrss) || 474 __put_user(r->ru_idrss, &ru->ru_idrss) || 475 __put_user(r->ru_isrss, &ru->ru_isrss) || 476 __put_user(r->ru_minflt, &ru->ru_minflt) || 477 __put_user(r->ru_majflt, &ru->ru_majflt) || 478 __put_user(r->ru_nswap, &ru->ru_nswap) || 479 __put_user(r->ru_inblock, &ru->ru_inblock) || 480 __put_user(r->ru_oublock, &ru->ru_oublock) || 481 __put_user(r->ru_msgsnd, &ru->ru_msgsnd) || 482 __put_user(r->ru_msgrcv, &ru->ru_msgrcv) || 483 __put_user(r->ru_nsignals, &ru->ru_nsignals) || 484 __put_user(r->ru_nvcsw, &ru->ru_nvcsw) || 485 __put_user(r->ru_nivcsw, &ru->ru_nivcsw)) 486 return -EFAULT; 487 return 0; 488 } 489 490 asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru) 491 { 492 struct rusage r; 493 int ret; 494 mm_segment_t old_fs = get_fs(); 495 496 set_fs(KERNEL_DS); 497 ret = sys_getrusage(who, (struct rusage __user *) &r); 498 set_fs(old_fs); 499 500 if (ret) 501 return ret; 502 503 if (put_compat_rusage(&r, ru)) 504 return -EFAULT; 505 506 return 0; 507 } 508 509 asmlinkage long 510 compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options, 511 struct compat_rusage __user *ru) 512 { 513 if (!ru) { 514 return sys_wait4(pid, stat_addr, options, NULL); 515 } else { 516 struct rusage r; 517 int ret; 518 unsigned int status; 519 mm_segment_t old_fs = get_fs(); 520 521 set_fs (KERNEL_DS); 522 ret = sys_wait4(pid, 523 (stat_addr ? 524 (unsigned int __user *) &status : NULL), 525 options, (struct rusage __user *) &r); 526 set_fs (old_fs); 527 528 if (ret > 0) { 529 if (put_compat_rusage(&r, ru)) 530 return -EFAULT; 531 if (stat_addr && put_user(status, stat_addr)) 532 return -EFAULT; 533 } 534 return ret; 535 } 536 } 537 538 asmlinkage long compat_sys_waitid(int which, compat_pid_t pid, 539 struct compat_siginfo __user *uinfo, int options, 540 struct compat_rusage __user *uru) 541 { 542 siginfo_t info; 543 struct rusage ru; 544 long ret; 545 mm_segment_t old_fs = get_fs(); 546 547 memset(&info, 0, sizeof(info)); 548 549 set_fs(KERNEL_DS); 550 ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options, 551 uru ? (struct rusage __user *)&ru : NULL); 552 set_fs(old_fs); 553 554 if ((ret < 0) || (info.si_signo == 0)) 555 return ret; 556 557 if (uru) { 558 ret = put_compat_rusage(&ru, uru); 559 if (ret) 560 return ret; 561 } 562 563 BUG_ON(info.si_code & __SI_MASK); 564 info.si_code |= __SI_CHLD; 565 return copy_siginfo_to_user32(uinfo, &info); 566 } 567 568 static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr, 569 unsigned len, struct cpumask *new_mask) 570 { 571 unsigned long *k; 572 573 if (len < cpumask_size()) 574 memset(new_mask, 0, cpumask_size()); 575 else if (len > cpumask_size()) 576 len = cpumask_size(); 577 578 k = cpumask_bits(new_mask); 579 return compat_get_bitmap(k, user_mask_ptr, len * 8); 580 } 581 582 asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid, 583 unsigned int len, 584 compat_ulong_t __user *user_mask_ptr) 585 { 586 cpumask_var_t new_mask; 587 int retval; 588 589 if (!alloc_cpumask_var(&new_mask, GFP_KERNEL)) 590 return -ENOMEM; 591 592 retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask); 593 if (retval) 594 goto out; 595 596 retval = sched_setaffinity(pid, new_mask); 597 out: 598 free_cpumask_var(new_mask); 599 return retval; 600 } 601 602 asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len, 603 compat_ulong_t __user *user_mask_ptr) 604 { 605 int ret; 606 cpumask_var_t mask; 607 608 if ((len * BITS_PER_BYTE) < nr_cpu_ids) 609 return -EINVAL; 610 if (len & (sizeof(compat_ulong_t)-1)) 611 return -EINVAL; 612 613 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 614 return -ENOMEM; 615 616 ret = sched_getaffinity(pid, mask); 617 if (ret == 0) { 618 size_t retlen = min_t(size_t, len, cpumask_size()); 619 620 if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8)) 621 ret = -EFAULT; 622 else 623 ret = retlen; 624 } 625 free_cpumask_var(mask); 626 627 return ret; 628 } 629 630 int get_compat_itimerspec(struct itimerspec *dst, 631 const struct compat_itimerspec __user *src) 632 { 633 if (get_compat_timespec(&dst->it_interval, &src->it_interval) || 634 get_compat_timespec(&dst->it_value, &src->it_value)) 635 return -EFAULT; 636 return 0; 637 } 638 639 int put_compat_itimerspec(struct compat_itimerspec __user *dst, 640 const struct itimerspec *src) 641 { 642 if (put_compat_timespec(&src->it_interval, &dst->it_interval) || 643 put_compat_timespec(&src->it_value, &dst->it_value)) 644 return -EFAULT; 645 return 0; 646 } 647 648 long compat_sys_timer_create(clockid_t which_clock, 649 struct compat_sigevent __user *timer_event_spec, 650 timer_t __user *created_timer_id) 651 { 652 struct sigevent __user *event = NULL; 653 654 if (timer_event_spec) { 655 struct sigevent kevent; 656 657 event = compat_alloc_user_space(sizeof(*event)); 658 if (get_compat_sigevent(&kevent, timer_event_spec) || 659 copy_to_user(event, &kevent, sizeof(*event))) 660 return -EFAULT; 661 } 662 663 return sys_timer_create(which_clock, event, created_timer_id); 664 } 665 666 long compat_sys_timer_settime(timer_t timer_id, int flags, 667 struct compat_itimerspec __user *new, 668 struct compat_itimerspec __user *old) 669 { 670 long err; 671 mm_segment_t oldfs; 672 struct itimerspec newts, oldts; 673 674 if (!new) 675 return -EINVAL; 676 if (get_compat_itimerspec(&newts, new)) 677 return -EFAULT; 678 oldfs = get_fs(); 679 set_fs(KERNEL_DS); 680 err = sys_timer_settime(timer_id, flags, 681 (struct itimerspec __user *) &newts, 682 (struct itimerspec __user *) &oldts); 683 set_fs(oldfs); 684 if (!err && old && put_compat_itimerspec(old, &oldts)) 685 return -EFAULT; 686 return err; 687 } 688 689 long compat_sys_timer_gettime(timer_t timer_id, 690 struct compat_itimerspec __user *setting) 691 { 692 long err; 693 mm_segment_t oldfs; 694 struct itimerspec ts; 695 696 oldfs = get_fs(); 697 set_fs(KERNEL_DS); 698 err = sys_timer_gettime(timer_id, 699 (struct itimerspec __user *) &ts); 700 set_fs(oldfs); 701 if (!err && put_compat_itimerspec(setting, &ts)) 702 return -EFAULT; 703 return err; 704 } 705 706 long compat_sys_clock_settime(clockid_t which_clock, 707 struct compat_timespec __user *tp) 708 { 709 long err; 710 mm_segment_t oldfs; 711 struct timespec ts; 712 713 if (get_compat_timespec(&ts, tp)) 714 return -EFAULT; 715 oldfs = get_fs(); 716 set_fs(KERNEL_DS); 717 err = sys_clock_settime(which_clock, 718 (struct timespec __user *) &ts); 719 set_fs(oldfs); 720 return err; 721 } 722 723 long compat_sys_clock_gettime(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 oldfs = get_fs(); 731 set_fs(KERNEL_DS); 732 err = sys_clock_gettime(which_clock, 733 (struct timespec __user *) &ts); 734 set_fs(oldfs); 735 if (!err && put_compat_timespec(&ts, tp)) 736 return -EFAULT; 737 return err; 738 } 739 740 long compat_sys_clock_adjtime(clockid_t which_clock, 741 struct compat_timex __user *utp) 742 { 743 struct timex txc; 744 mm_segment_t oldfs; 745 int err, ret; 746 747 err = compat_get_timex(&txc, utp); 748 if (err) 749 return err; 750 751 oldfs = get_fs(); 752 set_fs(KERNEL_DS); 753 ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc); 754 set_fs(oldfs); 755 756 err = compat_put_timex(utp, &txc); 757 if (err) 758 return err; 759 760 return ret; 761 } 762 763 long compat_sys_clock_getres(clockid_t which_clock, 764 struct compat_timespec __user *tp) 765 { 766 long err; 767 mm_segment_t oldfs; 768 struct timespec ts; 769 770 oldfs = get_fs(); 771 set_fs(KERNEL_DS); 772 err = sys_clock_getres(which_clock, 773 (struct timespec __user *) &ts); 774 set_fs(oldfs); 775 if (!err && tp && put_compat_timespec(&ts, tp)) 776 return -EFAULT; 777 return err; 778 } 779 780 static long compat_clock_nanosleep_restart(struct restart_block *restart) 781 { 782 long err; 783 mm_segment_t oldfs; 784 struct timespec tu; 785 struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp; 786 787 restart->nanosleep.rmtp = (struct timespec __user *) &tu; 788 oldfs = get_fs(); 789 set_fs(KERNEL_DS); 790 err = clock_nanosleep_restart(restart); 791 set_fs(oldfs); 792 793 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 794 put_compat_timespec(&tu, rmtp)) 795 return -EFAULT; 796 797 if (err == -ERESTART_RESTARTBLOCK) { 798 restart->fn = compat_clock_nanosleep_restart; 799 restart->nanosleep.compat_rmtp = rmtp; 800 } 801 return err; 802 } 803 804 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags, 805 struct compat_timespec __user *rqtp, 806 struct compat_timespec __user *rmtp) 807 { 808 long err; 809 mm_segment_t oldfs; 810 struct timespec in, out; 811 struct restart_block *restart; 812 813 if (get_compat_timespec(&in, rqtp)) 814 return -EFAULT; 815 816 oldfs = get_fs(); 817 set_fs(KERNEL_DS); 818 err = sys_clock_nanosleep(which_clock, flags, 819 (struct timespec __user *) &in, 820 (struct timespec __user *) &out); 821 set_fs(oldfs); 822 823 if ((err == -ERESTART_RESTARTBLOCK) && rmtp && 824 put_compat_timespec(&out, rmtp)) 825 return -EFAULT; 826 827 if (err == -ERESTART_RESTARTBLOCK) { 828 restart = ¤t_thread_info()->restart_block; 829 restart->fn = compat_clock_nanosleep_restart; 830 restart->nanosleep.compat_rmtp = rmtp; 831 } 832 return err; 833 } 834 835 /* 836 * We currently only need the following fields from the sigevent 837 * structure: sigev_value, sigev_signo, sig_notify and (sometimes 838 * sigev_notify_thread_id). The others are handled in user mode. 839 * We also assume that copying sigev_value.sival_int is sufficient 840 * to keep all the bits of sigev_value.sival_ptr intact. 841 */ 842 int get_compat_sigevent(struct sigevent *event, 843 const struct compat_sigevent __user *u_event) 844 { 845 memset(event, 0, sizeof(*event)); 846 return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) || 847 __get_user(event->sigev_value.sival_int, 848 &u_event->sigev_value.sival_int) || 849 __get_user(event->sigev_signo, &u_event->sigev_signo) || 850 __get_user(event->sigev_notify, &u_event->sigev_notify) || 851 __get_user(event->sigev_notify_thread_id, 852 &u_event->sigev_notify_thread_id)) 853 ? -EFAULT : 0; 854 } 855 856 long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask, 857 unsigned long bitmap_size) 858 { 859 int i, j; 860 unsigned long m; 861 compat_ulong_t um; 862 unsigned long nr_compat_longs; 863 864 /* align bitmap up to nearest compat_long_t boundary */ 865 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 866 867 if (!access_ok(VERIFY_READ, umask, bitmap_size / 8)) 868 return -EFAULT; 869 870 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 871 872 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 873 m = 0; 874 875 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 876 /* 877 * We dont want to read past the end of the userspace 878 * bitmap. We must however ensure the end of the 879 * kernel bitmap is zeroed. 880 */ 881 if (nr_compat_longs-- > 0) { 882 if (__get_user(um, umask)) 883 return -EFAULT; 884 } else { 885 um = 0; 886 } 887 888 umask++; 889 m |= (long)um << (j * BITS_PER_COMPAT_LONG); 890 } 891 *mask++ = m; 892 } 893 894 return 0; 895 } 896 897 long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask, 898 unsigned long bitmap_size) 899 { 900 int i, j; 901 unsigned long m; 902 compat_ulong_t um; 903 unsigned long nr_compat_longs; 904 905 /* align bitmap up to nearest compat_long_t boundary */ 906 bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG); 907 908 if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8)) 909 return -EFAULT; 910 911 nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size); 912 913 for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) { 914 m = *mask++; 915 916 for (j = 0; j < sizeof(m)/sizeof(um); j++) { 917 um = m; 918 919 /* 920 * We dont want to write past the end of the userspace 921 * bitmap. 922 */ 923 if (nr_compat_longs-- > 0) { 924 if (__put_user(um, umask)) 925 return -EFAULT; 926 } 927 928 umask++; 929 m >>= 4*sizeof(um); 930 m >>= 4*sizeof(um); 931 } 932 } 933 934 return 0; 935 } 936 937 void 938 sigset_from_compat (sigset_t *set, compat_sigset_t *compat) 939 { 940 switch (_NSIG_WORDS) { 941 case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 ); 942 case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 ); 943 case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 ); 944 case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 ); 945 } 946 } 947 EXPORT_SYMBOL_GPL(sigset_from_compat); 948 949 asmlinkage long 950 compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese, 951 struct compat_siginfo __user *uinfo, 952 struct compat_timespec __user *uts, compat_size_t sigsetsize) 953 { 954 compat_sigset_t s32; 955 sigset_t s; 956 struct timespec t; 957 siginfo_t info; 958 long ret; 959 960 if (sigsetsize != sizeof(sigset_t)) 961 return -EINVAL; 962 963 if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t))) 964 return -EFAULT; 965 sigset_from_compat(&s, &s32); 966 967 if (uts) { 968 if (get_compat_timespec(&t, uts)) 969 return -EFAULT; 970 } 971 972 ret = do_sigtimedwait(&s, &info, uts ? &t : NULL); 973 974 if (ret > 0 && uinfo) { 975 if (copy_siginfo_to_user32(uinfo, &info)) 976 ret = -EFAULT; 977 } 978 979 return ret; 980 981 } 982 983 asmlinkage long 984 compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig, 985 struct compat_siginfo __user *uinfo) 986 { 987 siginfo_t info; 988 989 if (copy_siginfo_from_user32(&info, uinfo)) 990 return -EFAULT; 991 return do_rt_tgsigqueueinfo(tgid, pid, sig, &info); 992 } 993 994 #ifdef __ARCH_WANT_COMPAT_SYS_TIME 995 996 /* compat_time_t is a 32 bit "long" and needs to get converted. */ 997 998 asmlinkage long compat_sys_time(compat_time_t __user * tloc) 999 { 1000 compat_time_t i; 1001 struct timeval tv; 1002 1003 do_gettimeofday(&tv); 1004 i = tv.tv_sec; 1005 1006 if (tloc) { 1007 if (put_user(i,tloc)) 1008 return -EFAULT; 1009 } 1010 force_successful_syscall_return(); 1011 return i; 1012 } 1013 1014 asmlinkage long compat_sys_stime(compat_time_t __user *tptr) 1015 { 1016 struct timespec tv; 1017 int err; 1018 1019 if (get_user(tv.tv_sec, tptr)) 1020 return -EFAULT; 1021 1022 tv.tv_nsec = 0; 1023 1024 err = security_settime(&tv, NULL); 1025 if (err) 1026 return err; 1027 1028 do_settimeofday(&tv); 1029 return 0; 1030 } 1031 1032 #endif /* __ARCH_WANT_COMPAT_SYS_TIME */ 1033 1034 #ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND 1035 asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize) 1036 { 1037 sigset_t newset; 1038 compat_sigset_t newset32; 1039 1040 /* XXX: Don't preclude handling different sized sigset_t's. */ 1041 if (sigsetsize != sizeof(sigset_t)) 1042 return -EINVAL; 1043 1044 if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t))) 1045 return -EFAULT; 1046 sigset_from_compat(&newset, &newset32); 1047 sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP)); 1048 1049 current->saved_sigmask = current->blocked; 1050 set_current_blocked(&newset); 1051 1052 current->state = TASK_INTERRUPTIBLE; 1053 schedule(); 1054 set_restore_sigmask(); 1055 return -ERESTARTNOHAND; 1056 } 1057 #endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */ 1058 1059 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp) 1060 { 1061 struct timex txc; 1062 int err, ret; 1063 1064 err = compat_get_timex(&txc, utp); 1065 if (err) 1066 return err; 1067 1068 ret = do_adjtimex(&txc); 1069 1070 err = compat_put_timex(utp, &txc); 1071 if (err) 1072 return err; 1073 1074 return ret; 1075 } 1076 1077 #ifdef CONFIG_NUMA 1078 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages, 1079 compat_uptr_t __user *pages32, 1080 const int __user *nodes, 1081 int __user *status, 1082 int flags) 1083 { 1084 const void __user * __user *pages; 1085 int i; 1086 1087 pages = compat_alloc_user_space(nr_pages * sizeof(void *)); 1088 for (i = 0; i < nr_pages; i++) { 1089 compat_uptr_t p; 1090 1091 if (get_user(p, pages32 + i) || 1092 put_user(compat_ptr(p), pages + i)) 1093 return -EFAULT; 1094 } 1095 return sys_move_pages(pid, nr_pages, pages, nodes, status, flags); 1096 } 1097 1098 asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, 1099 compat_ulong_t maxnode, 1100 const compat_ulong_t __user *old_nodes, 1101 const compat_ulong_t __user *new_nodes) 1102 { 1103 unsigned long __user *old = NULL; 1104 unsigned long __user *new = NULL; 1105 nodemask_t tmp_mask; 1106 unsigned long nr_bits; 1107 unsigned long size; 1108 1109 nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES); 1110 size = ALIGN(nr_bits, BITS_PER_LONG) / 8; 1111 if (old_nodes) { 1112 if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits)) 1113 return -EFAULT; 1114 old = compat_alloc_user_space(new_nodes ? size * 2 : size); 1115 if (new_nodes) 1116 new = old + size / sizeof(unsigned long); 1117 if (copy_to_user(old, nodes_addr(tmp_mask), size)) 1118 return -EFAULT; 1119 } 1120 if (new_nodes) { 1121 if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits)) 1122 return -EFAULT; 1123 if (new == NULL) 1124 new = compat_alloc_user_space(size); 1125 if (copy_to_user(new, nodes_addr(tmp_mask), size)) 1126 return -EFAULT; 1127 } 1128 return sys_migrate_pages(pid, nr_bits + 1, old, new); 1129 } 1130 #endif 1131 1132 struct compat_sysinfo { 1133 s32 uptime; 1134 u32 loads[3]; 1135 u32 totalram; 1136 u32 freeram; 1137 u32 sharedram; 1138 u32 bufferram; 1139 u32 totalswap; 1140 u32 freeswap; 1141 u16 procs; 1142 u16 pad; 1143 u32 totalhigh; 1144 u32 freehigh; 1145 u32 mem_unit; 1146 char _f[20-2*sizeof(u32)-sizeof(int)]; 1147 }; 1148 1149 asmlinkage long 1150 compat_sys_sysinfo(struct compat_sysinfo __user *info) 1151 { 1152 struct sysinfo s; 1153 1154 do_sysinfo(&s); 1155 1156 /* Check to see if any memory value is too large for 32-bit and scale 1157 * down if needed 1158 */ 1159 if ((s.totalram >> 32) || (s.totalswap >> 32)) { 1160 int bitcount = 0; 1161 1162 while (s.mem_unit < PAGE_SIZE) { 1163 s.mem_unit <<= 1; 1164 bitcount++; 1165 } 1166 1167 s.totalram >>= bitcount; 1168 s.freeram >>= bitcount; 1169 s.sharedram >>= bitcount; 1170 s.bufferram >>= bitcount; 1171 s.totalswap >>= bitcount; 1172 s.freeswap >>= bitcount; 1173 s.totalhigh >>= bitcount; 1174 s.freehigh >>= bitcount; 1175 } 1176 1177 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || 1178 __put_user (s.uptime, &info->uptime) || 1179 __put_user (s.loads[0], &info->loads[0]) || 1180 __put_user (s.loads[1], &info->loads[1]) || 1181 __put_user (s.loads[2], &info->loads[2]) || 1182 __put_user (s.totalram, &info->totalram) || 1183 __put_user (s.freeram, &info->freeram) || 1184 __put_user (s.sharedram, &info->sharedram) || 1185 __put_user (s.bufferram, &info->bufferram) || 1186 __put_user (s.totalswap, &info->totalswap) || 1187 __put_user (s.freeswap, &info->freeswap) || 1188 __put_user (s.procs, &info->procs) || 1189 __put_user (s.totalhigh, &info->totalhigh) || 1190 __put_user (s.freehigh, &info->freehigh) || 1191 __put_user (s.mem_unit, &info->mem_unit)) 1192 return -EFAULT; 1193 1194 return 0; 1195 } 1196 1197 /* 1198 * Allocate user-space memory for the duration of a single system call, 1199 * in order to marshall parameters inside a compat thunk. 1200 */ 1201 void __user *compat_alloc_user_space(unsigned long len) 1202 { 1203 void __user *ptr; 1204 1205 /* If len would occupy more than half of the entire compat space... */ 1206 if (unlikely(len > (((compat_uptr_t)~0) >> 1))) 1207 return NULL; 1208 1209 ptr = arch_compat_alloc_user_space(len); 1210 1211 if (unlikely(!access_ok(VERIFY_WRITE, ptr, len))) 1212 return NULL; 1213 1214 return ptr; 1215 } 1216 EXPORT_SYMBOL_GPL(compat_alloc_user_space); 1217