1 /* 2 * arch/s390x/kernel/linux32.c 3 * 4 * S390 version 5 * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation 6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 7 * Gerhard Tonn (ton@de.ibm.com) 8 * Thomas Spatzier (tspat@de.ibm.com) 9 * 10 * Conversion between 31bit and 64bit native syscalls. 11 * 12 * Heavily inspired by the 32-bit Sparc compat code which is 13 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 14 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) 15 * 16 */ 17 18 19 #include <linux/kernel.h> 20 #include <linux/sched.h> 21 #include <linux/fs.h> 22 #include <linux/mm.h> 23 #include <linux/file.h> 24 #include <linux/signal.h> 25 #include <linux/resource.h> 26 #include <linux/times.h> 27 #include <linux/utsname.h> 28 #include <linux/smp.h> 29 #include <linux/smp_lock.h> 30 #include <linux/sem.h> 31 #include <linux/msg.h> 32 #include <linux/shm.h> 33 #include <linux/slab.h> 34 #include <linux/uio.h> 35 #include <linux/nfs_fs.h> 36 #include <linux/quota.h> 37 #include <linux/module.h> 38 #include <linux/sunrpc/svc.h> 39 #include <linux/nfsd/nfsd.h> 40 #include <linux/nfsd/cache.h> 41 #include <linux/nfsd/xdr.h> 42 #include <linux/nfsd/syscall.h> 43 #include <linux/poll.h> 44 #include <linux/personality.h> 45 #include <linux/stat.h> 46 #include <linux/filter.h> 47 #include <linux/highmem.h> 48 #include <linux/highuid.h> 49 #include <linux/mman.h> 50 #include <linux/ipv6.h> 51 #include <linux/in.h> 52 #include <linux/icmpv6.h> 53 #include <linux/syscalls.h> 54 #include <linux/sysctl.h> 55 #include <linux/binfmts.h> 56 #include <linux/capability.h> 57 #include <linux/compat.h> 58 #include <linux/vfs.h> 59 #include <linux/ptrace.h> 60 #include <linux/fadvise.h> 61 62 #include <asm/types.h> 63 #include <asm/ipc.h> 64 #include <asm/uaccess.h> 65 #include <asm/semaphore.h> 66 67 #include <net/scm.h> 68 #include <net/sock.h> 69 70 #include "compat_linux.h" 71 72 long psw_user32_bits = (PSW_BASE32_BITS | PSW_MASK_DAT | PSW_ASC_HOME | 73 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK | 74 PSW_MASK_PSTATE | PSW_DEFAULT_KEY); 75 long psw32_user_bits = (PSW32_BASE_BITS | PSW32_MASK_DAT | PSW32_ASC_HOME | 76 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK | 77 PSW32_MASK_PSTATE); 78 79 /* For this source file, we want overflow handling. */ 80 81 #undef high2lowuid 82 #undef high2lowgid 83 #undef low2highuid 84 #undef low2highgid 85 #undef SET_UID16 86 #undef SET_GID16 87 #undef NEW_TO_OLD_UID 88 #undef NEW_TO_OLD_GID 89 #undef SET_OLDSTAT_UID 90 #undef SET_OLDSTAT_GID 91 #undef SET_STAT_UID 92 #undef SET_STAT_GID 93 94 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid) 95 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid) 96 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid) 97 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid) 98 #define SET_UID16(var, uid) var = high2lowuid(uid) 99 #define SET_GID16(var, gid) var = high2lowgid(gid) 100 #define NEW_TO_OLD_UID(uid) high2lowuid(uid) 101 #define NEW_TO_OLD_GID(gid) high2lowgid(gid) 102 #define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid) 103 #define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid) 104 #define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid) 105 #define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid) 106 107 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group) 108 { 109 return sys_chown(filename, low2highuid(user), low2highgid(group)); 110 } 111 112 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group) 113 { 114 return sys_lchown(filename, low2highuid(user), low2highgid(group)); 115 } 116 117 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group) 118 { 119 return sys_fchown(fd, low2highuid(user), low2highgid(group)); 120 } 121 122 asmlinkage long sys32_setregid16(u16 rgid, u16 egid) 123 { 124 return sys_setregid(low2highgid(rgid), low2highgid(egid)); 125 } 126 127 asmlinkage long sys32_setgid16(u16 gid) 128 { 129 return sys_setgid((gid_t)gid); 130 } 131 132 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid) 133 { 134 return sys_setreuid(low2highuid(ruid), low2highuid(euid)); 135 } 136 137 asmlinkage long sys32_setuid16(u16 uid) 138 { 139 return sys_setuid((uid_t)uid); 140 } 141 142 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid) 143 { 144 return sys_setresuid(low2highuid(ruid), low2highuid(euid), 145 low2highuid(suid)); 146 } 147 148 asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid) 149 { 150 int retval; 151 152 if (!(retval = put_user(high2lowuid(current->uid), ruid)) && 153 !(retval = put_user(high2lowuid(current->euid), euid))) 154 retval = put_user(high2lowuid(current->suid), suid); 155 156 return retval; 157 } 158 159 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid) 160 { 161 return sys_setresgid(low2highgid(rgid), low2highgid(egid), 162 low2highgid(sgid)); 163 } 164 165 asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid) 166 { 167 int retval; 168 169 if (!(retval = put_user(high2lowgid(current->gid), rgid)) && 170 !(retval = put_user(high2lowgid(current->egid), egid))) 171 retval = put_user(high2lowgid(current->sgid), sgid); 172 173 return retval; 174 } 175 176 asmlinkage long sys32_setfsuid16(u16 uid) 177 { 178 return sys_setfsuid((uid_t)uid); 179 } 180 181 asmlinkage long sys32_setfsgid16(u16 gid) 182 { 183 return sys_setfsgid((gid_t)gid); 184 } 185 186 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info) 187 { 188 int i; 189 u16 group; 190 191 for (i = 0; i < group_info->ngroups; i++) { 192 group = (u16)GROUP_AT(group_info, i); 193 if (put_user(group, grouplist+i)) 194 return -EFAULT; 195 } 196 197 return 0; 198 } 199 200 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist) 201 { 202 int i; 203 u16 group; 204 205 for (i = 0; i < group_info->ngroups; i++) { 206 if (get_user(group, grouplist+i)) 207 return -EFAULT; 208 GROUP_AT(group_info, i) = (gid_t)group; 209 } 210 211 return 0; 212 } 213 214 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist) 215 { 216 int i; 217 218 if (gidsetsize < 0) 219 return -EINVAL; 220 221 get_group_info(current->group_info); 222 i = current->group_info->ngroups; 223 if (gidsetsize) { 224 if (i > gidsetsize) { 225 i = -EINVAL; 226 goto out; 227 } 228 if (groups16_to_user(grouplist, current->group_info)) { 229 i = -EFAULT; 230 goto out; 231 } 232 } 233 out: 234 put_group_info(current->group_info); 235 return i; 236 } 237 238 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist) 239 { 240 struct group_info *group_info; 241 int retval; 242 243 if (!capable(CAP_SETGID)) 244 return -EPERM; 245 if ((unsigned)gidsetsize > NGROUPS_MAX) 246 return -EINVAL; 247 248 group_info = groups_alloc(gidsetsize); 249 if (!group_info) 250 return -ENOMEM; 251 retval = groups16_from_user(group_info, grouplist); 252 if (retval) { 253 put_group_info(group_info); 254 return retval; 255 } 256 257 retval = set_current_groups(group_info); 258 put_group_info(group_info); 259 260 return retval; 261 } 262 263 asmlinkage long sys32_getuid16(void) 264 { 265 return high2lowuid(current->uid); 266 } 267 268 asmlinkage long sys32_geteuid16(void) 269 { 270 return high2lowuid(current->euid); 271 } 272 273 asmlinkage long sys32_getgid16(void) 274 { 275 return high2lowgid(current->gid); 276 } 277 278 asmlinkage long sys32_getegid16(void) 279 { 280 return high2lowgid(current->egid); 281 } 282 283 /* 32-bit timeval and related flotsam. */ 284 285 static inline long get_tv32(struct timeval *o, struct compat_timeval __user *i) 286 { 287 return (!access_ok(VERIFY_READ, o, sizeof(*o)) || 288 (__get_user(o->tv_sec, &i->tv_sec) || 289 __get_user(o->tv_usec, &i->tv_usec))); 290 } 291 292 static inline long put_tv32(struct compat_timeval __user *o, struct timeval *i) 293 { 294 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) || 295 (__put_user(i->tv_sec, &o->tv_sec) || 296 __put_user(i->tv_usec, &o->tv_usec))); 297 } 298 299 /* 300 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation. 301 * 302 * This is really horribly ugly. 303 */ 304 #ifdef CONFIG_SYSVIPC 305 asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr) 306 { 307 if (call >> 16) /* hack for backward compatibility */ 308 return -EINVAL; 309 310 call &= 0xffff; 311 312 switch (call) { 313 case SEMTIMEDOP: 314 return compat_sys_semtimedop(first, compat_ptr(ptr), 315 second, compat_ptr(third)); 316 case SEMOP: 317 /* struct sembuf is the same on 32 and 64bit :)) */ 318 return sys_semtimedop(first, compat_ptr(ptr), 319 second, NULL); 320 case SEMGET: 321 return sys_semget(first, second, third); 322 case SEMCTL: 323 return compat_sys_semctl(first, second, third, 324 compat_ptr(ptr)); 325 case MSGSND: 326 return compat_sys_msgsnd(first, second, third, 327 compat_ptr(ptr)); 328 case MSGRCV: 329 return compat_sys_msgrcv(first, second, 0, third, 330 0, compat_ptr(ptr)); 331 case MSGGET: 332 return sys_msgget((key_t) first, second); 333 case MSGCTL: 334 return compat_sys_msgctl(first, second, compat_ptr(ptr)); 335 case SHMAT: 336 return compat_sys_shmat(first, second, third, 337 0, compat_ptr(ptr)); 338 case SHMDT: 339 return sys_shmdt(compat_ptr(ptr)); 340 case SHMGET: 341 return sys_shmget(first, (unsigned)second, third); 342 case SHMCTL: 343 return compat_sys_shmctl(first, second, compat_ptr(ptr)); 344 } 345 346 return -ENOSYS; 347 } 348 #endif 349 350 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low) 351 { 352 if ((int)high < 0) 353 return -EINVAL; 354 else 355 return sys_truncate(path, (high << 32) | low); 356 } 357 358 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low) 359 { 360 if ((int)high < 0) 361 return -EINVAL; 362 else 363 return sys_ftruncate(fd, (high << 32) | low); 364 } 365 366 int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf) 367 { 368 compat_ino_t ino; 369 int err; 370 371 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev)) 372 return -EOVERFLOW; 373 374 ino = stat->ino; 375 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino) 376 return -EOVERFLOW; 377 378 err = put_user(old_encode_dev(stat->dev), &statbuf->st_dev); 379 err |= put_user(stat->ino, &statbuf->st_ino); 380 err |= put_user(stat->mode, &statbuf->st_mode); 381 err |= put_user(stat->nlink, &statbuf->st_nlink); 382 err |= put_user(high2lowuid(stat->uid), &statbuf->st_uid); 383 err |= put_user(high2lowgid(stat->gid), &statbuf->st_gid); 384 err |= put_user(old_encode_dev(stat->rdev), &statbuf->st_rdev); 385 err |= put_user(stat->size, &statbuf->st_size); 386 err |= put_user(stat->atime.tv_sec, &statbuf->st_atime); 387 err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec); 388 err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime); 389 err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec); 390 err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime); 391 err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec); 392 err |= put_user(stat->blksize, &statbuf->st_blksize); 393 err |= put_user(stat->blocks, &statbuf->st_blocks); 394 /* fixme 395 err |= put_user(0, &statbuf->__unused4[0]); 396 err |= put_user(0, &statbuf->__unused4[1]); 397 */ 398 return err; 399 } 400 401 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid, 402 struct compat_timespec __user *interval) 403 { 404 struct timespec t; 405 int ret; 406 mm_segment_t old_fs = get_fs (); 407 408 set_fs (KERNEL_DS); 409 ret = sys_sched_rr_get_interval(pid, 410 (struct timespec __force __user *) &t); 411 set_fs (old_fs); 412 if (put_compat_timespec(&t, interval)) 413 return -EFAULT; 414 return ret; 415 } 416 417 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set, 418 compat_sigset_t __user *oset, size_t sigsetsize) 419 { 420 sigset_t s; 421 compat_sigset_t s32; 422 int ret; 423 mm_segment_t old_fs = get_fs(); 424 425 if (set) { 426 if (copy_from_user (&s32, set, sizeof(compat_sigset_t))) 427 return -EFAULT; 428 switch (_NSIG_WORDS) { 429 case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); 430 case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); 431 case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); 432 case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); 433 } 434 } 435 set_fs (KERNEL_DS); 436 ret = sys_rt_sigprocmask(how, 437 set ? (sigset_t __force __user *) &s : NULL, 438 oset ? (sigset_t __force __user *) &s : NULL, 439 sigsetsize); 440 set_fs (old_fs); 441 if (ret) return ret; 442 if (oset) { 443 switch (_NSIG_WORDS) { 444 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3]; 445 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2]; 446 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1]; 447 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0]; 448 } 449 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t))) 450 return -EFAULT; 451 } 452 return 0; 453 } 454 455 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set, 456 size_t sigsetsize) 457 { 458 sigset_t s; 459 compat_sigset_t s32; 460 int ret; 461 mm_segment_t old_fs = get_fs(); 462 463 set_fs (KERNEL_DS); 464 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize); 465 set_fs (old_fs); 466 if (!ret) { 467 switch (_NSIG_WORDS) { 468 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3]; 469 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2]; 470 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1]; 471 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0]; 472 } 473 if (copy_to_user (set, &s32, sizeof(compat_sigset_t))) 474 return -EFAULT; 475 } 476 return ret; 477 } 478 479 asmlinkage long 480 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo) 481 { 482 siginfo_t info; 483 int ret; 484 mm_segment_t old_fs = get_fs(); 485 486 if (copy_siginfo_from_user32(&info, uinfo)) 487 return -EFAULT; 488 set_fs (KERNEL_DS); 489 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info); 490 set_fs (old_fs); 491 return ret; 492 } 493 494 /* 495 * sys32_execve() executes a new program after the asm stub has set 496 * things up for us. This should basically do what I want it to. 497 */ 498 asmlinkage long 499 sys32_execve(struct pt_regs regs) 500 { 501 int error; 502 char * filename; 503 504 filename = getname(compat_ptr(regs.orig_gpr2)); 505 error = PTR_ERR(filename); 506 if (IS_ERR(filename)) 507 goto out; 508 error = compat_do_execve(filename, compat_ptr(regs.gprs[3]), 509 compat_ptr(regs.gprs[4]), ®s); 510 if (error == 0) 511 { 512 task_lock(current); 513 current->ptrace &= ~PT_DTRACE; 514 task_unlock(current); 515 current->thread.fp_regs.fpc=0; 516 asm volatile("sfpc %0,0" : : "d" (0)); 517 } 518 putname(filename); 519 out: 520 return error; 521 } 522 523 524 #ifdef CONFIG_MODULES 525 526 asmlinkage long 527 sys32_init_module(void __user *umod, unsigned long len, 528 const char __user *uargs) 529 { 530 return sys_init_module(umod, len, uargs); 531 } 532 533 asmlinkage long 534 sys32_delete_module(const char __user *name_user, unsigned int flags) 535 { 536 return sys_delete_module(name_user, flags); 537 } 538 539 #else /* CONFIG_MODULES */ 540 541 asmlinkage long 542 sys32_init_module(void __user *umod, unsigned long len, 543 const char __user *uargs) 544 { 545 return -ENOSYS; 546 } 547 548 asmlinkage long 549 sys32_delete_module(const char __user *name_user, unsigned int flags) 550 { 551 return -ENOSYS; 552 } 553 554 #endif /* CONFIG_MODULES */ 555 556 /* Translations due to time_t size differences. Which affects all 557 sorts of things, like timeval and itimerval. */ 558 559 extern struct timezone sys_tz; 560 561 asmlinkage long sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz) 562 { 563 if (tv) { 564 struct timeval ktv; 565 do_gettimeofday(&ktv); 566 if (put_tv32(tv, &ktv)) 567 return -EFAULT; 568 } 569 if (tz) { 570 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) 571 return -EFAULT; 572 } 573 return 0; 574 } 575 576 static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i) 577 { 578 long usec; 579 580 if (!access_ok(VERIFY_READ, i, sizeof(*i))) 581 return -EFAULT; 582 if (__get_user(o->tv_sec, &i->tv_sec)) 583 return -EFAULT; 584 if (__get_user(usec, &i->tv_usec)) 585 return -EFAULT; 586 o->tv_nsec = usec * 1000; 587 return 0; 588 } 589 590 asmlinkage long sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz) 591 { 592 struct timespec kts; 593 struct timezone ktz; 594 595 if (tv) { 596 if (get_ts32(&kts, tv)) 597 return -EFAULT; 598 } 599 if (tz) { 600 if (copy_from_user(&ktz, tz, sizeof(ktz))) 601 return -EFAULT; 602 } 603 604 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL); 605 } 606 607 /* These are here just in case some old sparc32 binary calls it. */ 608 asmlinkage long sys32_pause(void) 609 { 610 current->state = TASK_INTERRUPTIBLE; 611 schedule(); 612 return -ERESTARTNOHAND; 613 } 614 615 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf, 616 size_t count, u32 poshi, u32 poslo) 617 { 618 if ((compat_ssize_t) count < 0) 619 return -EINVAL; 620 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 621 } 622 623 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf, 624 size_t count, u32 poshi, u32 poslo) 625 { 626 if ((compat_ssize_t) count < 0) 627 return -EINVAL; 628 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 629 } 630 631 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count) 632 { 633 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count); 634 } 635 636 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count) 637 { 638 mm_segment_t old_fs = get_fs(); 639 int ret; 640 off_t of; 641 642 if (offset && get_user(of, offset)) 643 return -EFAULT; 644 645 set_fs(KERNEL_DS); 646 ret = sys_sendfile(out_fd, in_fd, 647 offset ? (off_t __force __user *) &of : NULL, count); 648 set_fs(old_fs); 649 650 if (offset && put_user(of, offset)) 651 return -EFAULT; 652 653 return ret; 654 } 655 656 asmlinkage long sys32_sendfile64(int out_fd, int in_fd, 657 compat_loff_t __user *offset, s32 count) 658 { 659 mm_segment_t old_fs = get_fs(); 660 int ret; 661 loff_t lof; 662 663 if (offset && get_user(lof, offset)) 664 return -EFAULT; 665 666 set_fs(KERNEL_DS); 667 ret = sys_sendfile64(out_fd, in_fd, 668 offset ? (loff_t __force __user *) &lof : NULL, 669 count); 670 set_fs(old_fs); 671 672 if (offset && put_user(lof, offset)) 673 return -EFAULT; 674 675 return ret; 676 } 677 678 #ifdef CONFIG_SYSCTL_SYSCALL 679 struct __sysctl_args32 { 680 u32 name; 681 int nlen; 682 u32 oldval; 683 u32 oldlenp; 684 u32 newval; 685 u32 newlen; 686 u32 __unused[4]; 687 }; 688 689 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args) 690 { 691 struct __sysctl_args32 tmp; 692 int error; 693 size_t oldlen; 694 size_t __user *oldlenp = NULL; 695 unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7; 696 697 if (copy_from_user(&tmp, args, sizeof(tmp))) 698 return -EFAULT; 699 700 if (tmp.oldval && tmp.oldlenp) { 701 /* Duh, this is ugly and might not work if sysctl_args 702 is in read-only memory, but do_sysctl does indirectly 703 a lot of uaccess in both directions and we'd have to 704 basically copy the whole sysctl.c here, and 705 glibc's __sysctl uses rw memory for the structure 706 anyway. */ 707 if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) || 708 put_user(oldlen, (size_t __user *)addr)) 709 return -EFAULT; 710 oldlenp = (size_t __user *)addr; 711 } 712 713 lock_kernel(); 714 error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval), 715 oldlenp, compat_ptr(tmp.newval), tmp.newlen); 716 unlock_kernel(); 717 if (oldlenp) { 718 if (!error) { 719 if (get_user(oldlen, (size_t __user *)addr) || 720 put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp))) 721 error = -EFAULT; 722 } 723 if (copy_to_user(args->__unused, tmp.__unused, 724 sizeof(tmp.__unused))) 725 error = -EFAULT; 726 } 727 return error; 728 } 729 #endif 730 731 struct stat64_emu31 { 732 unsigned long long st_dev; 733 unsigned int __pad1; 734 #define STAT64_HAS_BROKEN_ST_INO 1 735 u32 __st_ino; 736 unsigned int st_mode; 737 unsigned int st_nlink; 738 u32 st_uid; 739 u32 st_gid; 740 unsigned long long st_rdev; 741 unsigned int __pad3; 742 long st_size; 743 u32 st_blksize; 744 unsigned char __pad4[4]; 745 u32 __pad5; /* future possible st_blocks high bits */ 746 u32 st_blocks; /* Number 512-byte blocks allocated. */ 747 u32 st_atime; 748 u32 __pad6; 749 u32 st_mtime; 750 u32 __pad7; 751 u32 st_ctime; 752 u32 __pad8; /* will be high 32 bits of ctime someday */ 753 unsigned long st_ino; 754 }; 755 756 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat) 757 { 758 struct stat64_emu31 tmp; 759 760 memset(&tmp, 0, sizeof(tmp)); 761 762 tmp.st_dev = huge_encode_dev(stat->dev); 763 tmp.st_ino = stat->ino; 764 tmp.__st_ino = (u32)stat->ino; 765 tmp.st_mode = stat->mode; 766 tmp.st_nlink = (unsigned int)stat->nlink; 767 tmp.st_uid = stat->uid; 768 tmp.st_gid = stat->gid; 769 tmp.st_rdev = huge_encode_dev(stat->rdev); 770 tmp.st_size = stat->size; 771 tmp.st_blksize = (u32)stat->blksize; 772 tmp.st_blocks = (u32)stat->blocks; 773 tmp.st_atime = (u32)stat->atime.tv_sec; 774 tmp.st_mtime = (u32)stat->mtime.tv_sec; 775 tmp.st_ctime = (u32)stat->ctime.tv_sec; 776 777 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 778 } 779 780 asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf) 781 { 782 struct kstat stat; 783 int ret = vfs_stat(filename, &stat); 784 if (!ret) 785 ret = cp_stat64(statbuf, &stat); 786 return ret; 787 } 788 789 asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf) 790 { 791 struct kstat stat; 792 int ret = vfs_lstat(filename, &stat); 793 if (!ret) 794 ret = cp_stat64(statbuf, &stat); 795 return ret; 796 } 797 798 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf) 799 { 800 struct kstat stat; 801 int ret = vfs_fstat(fd, &stat); 802 if (!ret) 803 ret = cp_stat64(statbuf, &stat); 804 return ret; 805 } 806 807 asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename, 808 struct stat64_emu31 __user* statbuf, int flag) 809 { 810 struct kstat stat; 811 int error = -EINVAL; 812 813 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) 814 goto out; 815 816 if (flag & AT_SYMLINK_NOFOLLOW) 817 error = vfs_lstat_fd(dfd, filename, &stat); 818 else 819 error = vfs_stat_fd(dfd, filename, &stat); 820 821 if (!error) 822 error = cp_stat64(statbuf, &stat); 823 out: 824 return error; 825 } 826 827 /* 828 * Linux/i386 didn't use to be able to handle more than 829 * 4 system call parameters, so these system calls used a memory 830 * block for parameter passing.. 831 */ 832 833 struct mmap_arg_struct_emu31 { 834 u32 addr; 835 u32 len; 836 u32 prot; 837 u32 flags; 838 u32 fd; 839 u32 offset; 840 }; 841 842 /* common code for old and new mmaps */ 843 static inline long do_mmap2( 844 unsigned long addr, unsigned long len, 845 unsigned long prot, unsigned long flags, 846 unsigned long fd, unsigned long pgoff) 847 { 848 struct file * file = NULL; 849 unsigned long error = -EBADF; 850 851 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 852 if (!(flags & MAP_ANONYMOUS)) { 853 file = fget(fd); 854 if (!file) 855 goto out; 856 } 857 858 down_write(¤t->mm->mmap_sem); 859 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); 860 if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) { 861 /* Result is out of bounds. */ 862 do_munmap(current->mm, addr, len); 863 error = -ENOMEM; 864 } 865 up_write(¤t->mm->mmap_sem); 866 867 if (file) 868 fput(file); 869 out: 870 return error; 871 } 872 873 874 asmlinkage unsigned long 875 old32_mmap(struct mmap_arg_struct_emu31 __user *arg) 876 { 877 struct mmap_arg_struct_emu31 a; 878 int error = -EFAULT; 879 880 if (copy_from_user(&a, arg, sizeof(a))) 881 goto out; 882 883 error = -EINVAL; 884 if (a.offset & ~PAGE_MASK) 885 goto out; 886 887 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); 888 out: 889 return error; 890 } 891 892 asmlinkage long 893 sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg) 894 { 895 struct mmap_arg_struct_emu31 a; 896 int error = -EFAULT; 897 898 if (copy_from_user(&a, arg, sizeof(a))) 899 goto out; 900 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); 901 out: 902 return error; 903 } 904 905 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count) 906 { 907 if ((compat_ssize_t) count < 0) 908 return -EINVAL; 909 910 return sys_read(fd, buf, count); 911 } 912 913 asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count) 914 { 915 if ((compat_ssize_t) count < 0) 916 return -EINVAL; 917 918 return sys_write(fd, buf, count); 919 } 920 921 asmlinkage long sys32_clone(struct pt_regs regs) 922 { 923 unsigned long clone_flags; 924 unsigned long newsp; 925 int __user *parent_tidptr, *child_tidptr; 926 927 clone_flags = regs.gprs[3] & 0xffffffffUL; 928 newsp = regs.orig_gpr2 & 0x7fffffffUL; 929 parent_tidptr = compat_ptr(regs.gprs[4]); 930 child_tidptr = compat_ptr(regs.gprs[5]); 931 if (!newsp) 932 newsp = regs.gprs[15]; 933 return do_fork(clone_flags, newsp, ®s, 0, 934 parent_tidptr, child_tidptr); 935 } 936 937 /* 938 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64. 939 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE} 940 * because the 31 bit values differ from the 64 bit values. 941 */ 942 943 asmlinkage long 944 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise) 945 { 946 if (advise == 4) 947 advise = POSIX_FADV_DONTNEED; 948 else if (advise == 5) 949 advise = POSIX_FADV_NOREUSE; 950 return sys_fadvise64(fd, offset, len, advise); 951 } 952 953 struct fadvise64_64_args { 954 int fd; 955 long long offset; 956 long long len; 957 int advice; 958 }; 959 960 asmlinkage long 961 sys32_fadvise64_64(struct fadvise64_64_args __user *args) 962 { 963 struct fadvise64_64_args a; 964 965 if ( copy_from_user(&a, args, sizeof(a)) ) 966 return -EFAULT; 967 if (a.advice == 4) 968 a.advice = POSIX_FADV_DONTNEED; 969 else if (a.advice == 5) 970 a.advice = POSIX_FADV_NOREUSE; 971 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); 972 } 973