compat_linux.c revision cba4fbbff2e9722e93b28e18fa7714b9013cbdda
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#include <linux/ipc.h> 62 63#include <asm/types.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 72long 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); 75long 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 107asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group) 108{ 109 return sys_chown(filename, low2highuid(user), low2highgid(group)); 110} 111 112asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group) 113{ 114 return sys_lchown(filename, low2highuid(user), low2highgid(group)); 115} 116 117asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group) 118{ 119 return sys_fchown(fd, low2highuid(user), low2highgid(group)); 120} 121 122asmlinkage long sys32_setregid16(u16 rgid, u16 egid) 123{ 124 return sys_setregid(low2highgid(rgid), low2highgid(egid)); 125} 126 127asmlinkage long sys32_setgid16(u16 gid) 128{ 129 return sys_setgid((gid_t)gid); 130} 131 132asmlinkage long sys32_setreuid16(u16 ruid, u16 euid) 133{ 134 return sys_setreuid(low2highuid(ruid), low2highuid(euid)); 135} 136 137asmlinkage long sys32_setuid16(u16 uid) 138{ 139 return sys_setuid((uid_t)uid); 140} 141 142asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid) 143{ 144 return sys_setresuid(low2highuid(ruid), low2highuid(euid), 145 low2highuid(suid)); 146} 147 148asmlinkage 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 159asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid) 160{ 161 return sys_setresgid(low2highgid(rgid), low2highgid(egid), 162 low2highgid(sgid)); 163} 164 165asmlinkage 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 176asmlinkage long sys32_setfsuid16(u16 uid) 177{ 178 return sys_setfsuid((uid_t)uid); 179} 180 181asmlinkage long sys32_setfsgid16(u16 gid) 182{ 183 return sys_setfsgid((gid_t)gid); 184} 185 186static 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 200static 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 214asmlinkage 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 } 233out: 234 put_group_info(current->group_info); 235 return i; 236} 237 238asmlinkage 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 263asmlinkage long sys32_getuid16(void) 264{ 265 return high2lowuid(current->uid); 266} 267 268asmlinkage long sys32_geteuid16(void) 269{ 270 return high2lowuid(current->euid); 271} 272 273asmlinkage long sys32_getgid16(void) 274{ 275 return high2lowgid(current->gid); 276} 277 278asmlinkage long sys32_getegid16(void) 279{ 280 return high2lowgid(current->egid); 281} 282 283/* 32-bit timeval and related flotsam. */ 284 285static 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 292static 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 305asmlinkage 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 350asmlinkage 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 358asmlinkage 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 366int 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 401asmlinkage 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 417asmlinkage 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 455asmlinkage 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 479asmlinkage long 480sys32_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 */ 498asmlinkage long sys32_execve(void) 499{ 500 struct pt_regs *regs = task_pt_regs(current); 501 char *filename; 502 unsigned long result; 503 int rc; 504 505 filename = getname(compat_ptr(regs->orig_gpr2)); 506 if (IS_ERR(filename)) { 507 result = PTR_ERR(filename); 508 goto out; 509 } 510 rc = compat_do_execve(filename, compat_ptr(regs->gprs[3]), 511 compat_ptr(regs->gprs[4]), regs); 512 if (rc) { 513 result = rc; 514 goto out_putname; 515 } 516 task_lock(current); 517 current->ptrace &= ~PT_DTRACE; 518 task_unlock(current); 519 current->thread.fp_regs.fpc=0; 520 asm volatile("sfpc %0,0" : : "d" (0)); 521 result = regs->gprs[2]; 522out_putname: 523 putname(filename); 524out: 525 return result; 526} 527 528 529#ifdef CONFIG_MODULES 530 531asmlinkage long 532sys32_init_module(void __user *umod, unsigned long len, 533 const char __user *uargs) 534{ 535 return sys_init_module(umod, len, uargs); 536} 537 538asmlinkage long 539sys32_delete_module(const char __user *name_user, unsigned int flags) 540{ 541 return sys_delete_module(name_user, flags); 542} 543 544#else /* CONFIG_MODULES */ 545 546asmlinkage long 547sys32_init_module(void __user *umod, unsigned long len, 548 const char __user *uargs) 549{ 550 return -ENOSYS; 551} 552 553asmlinkage long 554sys32_delete_module(const char __user *name_user, unsigned int flags) 555{ 556 return -ENOSYS; 557} 558 559#endif /* CONFIG_MODULES */ 560 561/* Translations due to time_t size differences. Which affects all 562 sorts of things, like timeval and itimerval. */ 563 564extern struct timezone sys_tz; 565 566asmlinkage long sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz) 567{ 568 if (tv) { 569 struct timeval ktv; 570 do_gettimeofday(&ktv); 571 if (put_tv32(tv, &ktv)) 572 return -EFAULT; 573 } 574 if (tz) { 575 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) 576 return -EFAULT; 577 } 578 return 0; 579} 580 581static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i) 582{ 583 long usec; 584 585 if (!access_ok(VERIFY_READ, i, sizeof(*i))) 586 return -EFAULT; 587 if (__get_user(o->tv_sec, &i->tv_sec)) 588 return -EFAULT; 589 if (__get_user(usec, &i->tv_usec)) 590 return -EFAULT; 591 o->tv_nsec = usec * 1000; 592 return 0; 593} 594 595asmlinkage long sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz) 596{ 597 struct timespec kts; 598 struct timezone ktz; 599 600 if (tv) { 601 if (get_ts32(&kts, tv)) 602 return -EFAULT; 603 } 604 if (tz) { 605 if (copy_from_user(&ktz, tz, sizeof(ktz))) 606 return -EFAULT; 607 } 608 609 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL); 610} 611 612/* These are here just in case some old sparc32 binary calls it. */ 613asmlinkage long sys32_pause(void) 614{ 615 current->state = TASK_INTERRUPTIBLE; 616 schedule(); 617 return -ERESTARTNOHAND; 618} 619 620asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf, 621 size_t count, u32 poshi, u32 poslo) 622{ 623 if ((compat_ssize_t) count < 0) 624 return -EINVAL; 625 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 626} 627 628asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf, 629 size_t count, u32 poshi, u32 poslo) 630{ 631 if ((compat_ssize_t) count < 0) 632 return -EINVAL; 633 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 634} 635 636asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count) 637{ 638 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count); 639} 640 641asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count) 642{ 643 mm_segment_t old_fs = get_fs(); 644 int ret; 645 off_t of; 646 647 if (offset && get_user(of, offset)) 648 return -EFAULT; 649 650 set_fs(KERNEL_DS); 651 ret = sys_sendfile(out_fd, in_fd, 652 offset ? (off_t __force __user *) &of : NULL, count); 653 set_fs(old_fs); 654 655 if (offset && put_user(of, offset)) 656 return -EFAULT; 657 658 return ret; 659} 660 661asmlinkage long sys32_sendfile64(int out_fd, int in_fd, 662 compat_loff_t __user *offset, s32 count) 663{ 664 mm_segment_t old_fs = get_fs(); 665 int ret; 666 loff_t lof; 667 668 if (offset && get_user(lof, offset)) 669 return -EFAULT; 670 671 set_fs(KERNEL_DS); 672 ret = sys_sendfile64(out_fd, in_fd, 673 offset ? (loff_t __force __user *) &lof : NULL, 674 count); 675 set_fs(old_fs); 676 677 if (offset && put_user(lof, offset)) 678 return -EFAULT; 679 680 return ret; 681} 682 683#ifdef CONFIG_SYSCTL_SYSCALL 684struct __sysctl_args32 { 685 u32 name; 686 int nlen; 687 u32 oldval; 688 u32 oldlenp; 689 u32 newval; 690 u32 newlen; 691 u32 __unused[4]; 692}; 693 694asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args) 695{ 696 struct __sysctl_args32 tmp; 697 int error; 698 size_t oldlen; 699 size_t __user *oldlenp = NULL; 700 unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7; 701 702 if (copy_from_user(&tmp, args, sizeof(tmp))) 703 return -EFAULT; 704 705 if (tmp.oldval && tmp.oldlenp) { 706 /* Duh, this is ugly and might not work if sysctl_args 707 is in read-only memory, but do_sysctl does indirectly 708 a lot of uaccess in both directions and we'd have to 709 basically copy the whole sysctl.c here, and 710 glibc's __sysctl uses rw memory for the structure 711 anyway. */ 712 if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) || 713 put_user(oldlen, (size_t __user *)addr)) 714 return -EFAULT; 715 oldlenp = (size_t __user *)addr; 716 } 717 718 lock_kernel(); 719 error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval), 720 oldlenp, compat_ptr(tmp.newval), tmp.newlen); 721 unlock_kernel(); 722 if (oldlenp) { 723 if (!error) { 724 if (get_user(oldlen, (size_t __user *)addr) || 725 put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp))) 726 error = -EFAULT; 727 } 728 if (copy_to_user(args->__unused, tmp.__unused, 729 sizeof(tmp.__unused))) 730 error = -EFAULT; 731 } 732 return error; 733} 734#endif 735 736struct stat64_emu31 { 737 unsigned long long st_dev; 738 unsigned int __pad1; 739#define STAT64_HAS_BROKEN_ST_INO 1 740 u32 __st_ino; 741 unsigned int st_mode; 742 unsigned int st_nlink; 743 u32 st_uid; 744 u32 st_gid; 745 unsigned long long st_rdev; 746 unsigned int __pad3; 747 long st_size; 748 u32 st_blksize; 749 unsigned char __pad4[4]; 750 u32 __pad5; /* future possible st_blocks high bits */ 751 u32 st_blocks; /* Number 512-byte blocks allocated. */ 752 u32 st_atime; 753 u32 __pad6; 754 u32 st_mtime; 755 u32 __pad7; 756 u32 st_ctime; 757 u32 __pad8; /* will be high 32 bits of ctime someday */ 758 unsigned long st_ino; 759}; 760 761static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat) 762{ 763 struct stat64_emu31 tmp; 764 765 memset(&tmp, 0, sizeof(tmp)); 766 767 tmp.st_dev = huge_encode_dev(stat->dev); 768 tmp.st_ino = stat->ino; 769 tmp.__st_ino = (u32)stat->ino; 770 tmp.st_mode = stat->mode; 771 tmp.st_nlink = (unsigned int)stat->nlink; 772 tmp.st_uid = stat->uid; 773 tmp.st_gid = stat->gid; 774 tmp.st_rdev = huge_encode_dev(stat->rdev); 775 tmp.st_size = stat->size; 776 tmp.st_blksize = (u32)stat->blksize; 777 tmp.st_blocks = (u32)stat->blocks; 778 tmp.st_atime = (u32)stat->atime.tv_sec; 779 tmp.st_mtime = (u32)stat->mtime.tv_sec; 780 tmp.st_ctime = (u32)stat->ctime.tv_sec; 781 782 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 783} 784 785asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf) 786{ 787 struct kstat stat; 788 int ret = vfs_stat(filename, &stat); 789 if (!ret) 790 ret = cp_stat64(statbuf, &stat); 791 return ret; 792} 793 794asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf) 795{ 796 struct kstat stat; 797 int ret = vfs_lstat(filename, &stat); 798 if (!ret) 799 ret = cp_stat64(statbuf, &stat); 800 return ret; 801} 802 803asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf) 804{ 805 struct kstat stat; 806 int ret = vfs_fstat(fd, &stat); 807 if (!ret) 808 ret = cp_stat64(statbuf, &stat); 809 return ret; 810} 811 812asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename, 813 struct stat64_emu31 __user* statbuf, int flag) 814{ 815 struct kstat stat; 816 int error = -EINVAL; 817 818 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) 819 goto out; 820 821 if (flag & AT_SYMLINK_NOFOLLOW) 822 error = vfs_lstat_fd(dfd, filename, &stat); 823 else 824 error = vfs_stat_fd(dfd, filename, &stat); 825 826 if (!error) 827 error = cp_stat64(statbuf, &stat); 828out: 829 return error; 830} 831 832/* 833 * Linux/i386 didn't use to be able to handle more than 834 * 4 system call parameters, so these system calls used a memory 835 * block for parameter passing.. 836 */ 837 838struct mmap_arg_struct_emu31 { 839 u32 addr; 840 u32 len; 841 u32 prot; 842 u32 flags; 843 u32 fd; 844 u32 offset; 845}; 846 847/* common code for old and new mmaps */ 848static inline long do_mmap2( 849 unsigned long addr, unsigned long len, 850 unsigned long prot, unsigned long flags, 851 unsigned long fd, unsigned long pgoff) 852{ 853 struct file * file = NULL; 854 unsigned long error = -EBADF; 855 856 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 857 if (!(flags & MAP_ANONYMOUS)) { 858 file = fget(fd); 859 if (!file) 860 goto out; 861 } 862 863 down_write(¤t->mm->mmap_sem); 864 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); 865 if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) { 866 /* Result is out of bounds. */ 867 do_munmap(current->mm, addr, len); 868 error = -ENOMEM; 869 } 870 up_write(¤t->mm->mmap_sem); 871 872 if (file) 873 fput(file); 874out: 875 return error; 876} 877 878 879asmlinkage unsigned long 880old32_mmap(struct mmap_arg_struct_emu31 __user *arg) 881{ 882 struct mmap_arg_struct_emu31 a; 883 int error = -EFAULT; 884 885 if (copy_from_user(&a, arg, sizeof(a))) 886 goto out; 887 888 error = -EINVAL; 889 if (a.offset & ~PAGE_MASK) 890 goto out; 891 892 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); 893out: 894 return error; 895} 896 897asmlinkage long 898sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg) 899{ 900 struct mmap_arg_struct_emu31 a; 901 int error = -EFAULT; 902 903 if (copy_from_user(&a, arg, sizeof(a))) 904 goto out; 905 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); 906out: 907 return error; 908} 909 910asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count) 911{ 912 if ((compat_ssize_t) count < 0) 913 return -EINVAL; 914 915 return sys_read(fd, buf, count); 916} 917 918asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count) 919{ 920 if ((compat_ssize_t) count < 0) 921 return -EINVAL; 922 923 return sys_write(fd, buf, count); 924} 925 926asmlinkage long sys32_clone(void) 927{ 928 struct pt_regs *regs = task_pt_regs(current); 929 unsigned long clone_flags; 930 unsigned long newsp; 931 int __user *parent_tidptr, *child_tidptr; 932 933 clone_flags = regs->gprs[3] & 0xffffffffUL; 934 newsp = regs->orig_gpr2 & 0x7fffffffUL; 935 parent_tidptr = compat_ptr(regs->gprs[4]); 936 child_tidptr = compat_ptr(regs->gprs[5]); 937 if (!newsp) 938 newsp = regs->gprs[15]; 939 return do_fork(clone_flags, newsp, regs, 0, 940 parent_tidptr, child_tidptr); 941} 942 943/* 944 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64. 945 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE} 946 * because the 31 bit values differ from the 64 bit values. 947 */ 948 949asmlinkage long 950sys32_fadvise64(int fd, loff_t offset, size_t len, int advise) 951{ 952 if (advise == 4) 953 advise = POSIX_FADV_DONTNEED; 954 else if (advise == 5) 955 advise = POSIX_FADV_NOREUSE; 956 return sys_fadvise64(fd, offset, len, advise); 957} 958 959struct fadvise64_64_args { 960 int fd; 961 long long offset; 962 long long len; 963 int advice; 964}; 965 966asmlinkage long 967sys32_fadvise64_64(struct fadvise64_64_args __user *args) 968{ 969 struct fadvise64_64_args a; 970 971 if ( copy_from_user(&a, args, sizeof(a)) ) 972 return -EFAULT; 973 if (a.advice == 4) 974 a.advice = POSIX_FADV_DONTNEED; 975 else if (a.advice == 5) 976 a.advice = POSIX_FADV_NOREUSE; 977 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); 978} 979