compat_linux.c revision c1821c2e9711adc3cd298a16b7237c92a2cee78d
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 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 401struct sysinfo32 { 402 s32 uptime; 403 u32 loads[3]; 404 u32 totalram; 405 u32 freeram; 406 u32 sharedram; 407 u32 bufferram; 408 u32 totalswap; 409 u32 freeswap; 410 unsigned short procs; 411 unsigned short pads; 412 u32 totalhigh; 413 u32 freehigh; 414 unsigned int mem_unit; 415 char _f[8]; 416}; 417 418asmlinkage long sys32_sysinfo(struct sysinfo32 __user *info) 419{ 420 struct sysinfo s; 421 int ret, err; 422 mm_segment_t old_fs = get_fs (); 423 424 set_fs (KERNEL_DS); 425 ret = sys_sysinfo((struct sysinfo __force __user *) &s); 426 set_fs (old_fs); 427 err = put_user (s.uptime, &info->uptime); 428 err |= __put_user (s.loads[0], &info->loads[0]); 429 err |= __put_user (s.loads[1], &info->loads[1]); 430 err |= __put_user (s.loads[2], &info->loads[2]); 431 err |= __put_user (s.totalram, &info->totalram); 432 err |= __put_user (s.freeram, &info->freeram); 433 err |= __put_user (s.sharedram, &info->sharedram); 434 err |= __put_user (s.bufferram, &info->bufferram); 435 err |= __put_user (s.totalswap, &info->totalswap); 436 err |= __put_user (s.freeswap, &info->freeswap); 437 err |= __put_user (s.procs, &info->procs); 438 err |= __put_user (s.totalhigh, &info->totalhigh); 439 err |= __put_user (s.freehigh, &info->freehigh); 440 err |= __put_user (s.mem_unit, &info->mem_unit); 441 if (err) 442 return -EFAULT; 443 return ret; 444} 445 446asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid, 447 struct compat_timespec __user *interval) 448{ 449 struct timespec t; 450 int ret; 451 mm_segment_t old_fs = get_fs (); 452 453 set_fs (KERNEL_DS); 454 ret = sys_sched_rr_get_interval(pid, 455 (struct timespec __force __user *) &t); 456 set_fs (old_fs); 457 if (put_compat_timespec(&t, interval)) 458 return -EFAULT; 459 return ret; 460} 461 462asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set, 463 compat_sigset_t __user *oset, size_t sigsetsize) 464{ 465 sigset_t s; 466 compat_sigset_t s32; 467 int ret; 468 mm_segment_t old_fs = get_fs(); 469 470 if (set) { 471 if (copy_from_user (&s32, set, sizeof(compat_sigset_t))) 472 return -EFAULT; 473 switch (_NSIG_WORDS) { 474 case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32); 475 case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32); 476 case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32); 477 case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); 478 } 479 } 480 set_fs (KERNEL_DS); 481 ret = sys_rt_sigprocmask(how, 482 set ? (sigset_t __force __user *) &s : NULL, 483 oset ? (sigset_t __force __user *) &s : NULL, 484 sigsetsize); 485 set_fs (old_fs); 486 if (ret) return ret; 487 if (oset) { 488 switch (_NSIG_WORDS) { 489 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3]; 490 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2]; 491 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1]; 492 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0]; 493 } 494 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t))) 495 return -EFAULT; 496 } 497 return 0; 498} 499 500asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set, 501 size_t sigsetsize) 502{ 503 sigset_t s; 504 compat_sigset_t s32; 505 int ret; 506 mm_segment_t old_fs = get_fs(); 507 508 set_fs (KERNEL_DS); 509 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize); 510 set_fs (old_fs); 511 if (!ret) { 512 switch (_NSIG_WORDS) { 513 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3]; 514 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2]; 515 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1]; 516 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0]; 517 } 518 if (copy_to_user (set, &s32, sizeof(compat_sigset_t))) 519 return -EFAULT; 520 } 521 return ret; 522} 523 524asmlinkage long 525sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo) 526{ 527 siginfo_t info; 528 int ret; 529 mm_segment_t old_fs = get_fs(); 530 531 if (copy_siginfo_from_user32(&info, uinfo)) 532 return -EFAULT; 533 set_fs (KERNEL_DS); 534 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info); 535 set_fs (old_fs); 536 return ret; 537} 538 539/* 540 * sys32_execve() executes a new program after the asm stub has set 541 * things up for us. This should basically do what I want it to. 542 */ 543asmlinkage long 544sys32_execve(struct pt_regs regs) 545{ 546 int error; 547 char * filename; 548 549 filename = getname(compat_ptr(regs.orig_gpr2)); 550 error = PTR_ERR(filename); 551 if (IS_ERR(filename)) 552 goto out; 553 error = compat_do_execve(filename, compat_ptr(regs.gprs[3]), 554 compat_ptr(regs.gprs[4]), ®s); 555 if (error == 0) 556 { 557 task_lock(current); 558 current->ptrace &= ~PT_DTRACE; 559 task_unlock(current); 560 current->thread.fp_regs.fpc=0; 561 asm volatile("sfpc %0,0" : : "d" (0)); 562 } 563 putname(filename); 564out: 565 return error; 566} 567 568 569#ifdef CONFIG_MODULES 570 571asmlinkage long 572sys32_init_module(void __user *umod, unsigned long len, 573 const char __user *uargs) 574{ 575 return sys_init_module(umod, len, uargs); 576} 577 578asmlinkage long 579sys32_delete_module(const char __user *name_user, unsigned int flags) 580{ 581 return sys_delete_module(name_user, flags); 582} 583 584#else /* CONFIG_MODULES */ 585 586asmlinkage long 587sys32_init_module(void __user *umod, unsigned long len, 588 const char __user *uargs) 589{ 590 return -ENOSYS; 591} 592 593asmlinkage long 594sys32_delete_module(const char __user *name_user, unsigned int flags) 595{ 596 return -ENOSYS; 597} 598 599#endif /* CONFIG_MODULES */ 600 601/* Translations due to time_t size differences. Which affects all 602 sorts of things, like timeval and itimerval. */ 603 604extern struct timezone sys_tz; 605 606asmlinkage long sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz) 607{ 608 if (tv) { 609 struct timeval ktv; 610 do_gettimeofday(&ktv); 611 if (put_tv32(tv, &ktv)) 612 return -EFAULT; 613 } 614 if (tz) { 615 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz))) 616 return -EFAULT; 617 } 618 return 0; 619} 620 621static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i) 622{ 623 long usec; 624 625 if (!access_ok(VERIFY_READ, i, sizeof(*i))) 626 return -EFAULT; 627 if (__get_user(o->tv_sec, &i->tv_sec)) 628 return -EFAULT; 629 if (__get_user(usec, &i->tv_usec)) 630 return -EFAULT; 631 o->tv_nsec = usec * 1000; 632 return 0; 633} 634 635asmlinkage long sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz) 636{ 637 struct timespec kts; 638 struct timezone ktz; 639 640 if (tv) { 641 if (get_ts32(&kts, tv)) 642 return -EFAULT; 643 } 644 if (tz) { 645 if (copy_from_user(&ktz, tz, sizeof(ktz))) 646 return -EFAULT; 647 } 648 649 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL); 650} 651 652/* These are here just in case some old sparc32 binary calls it. */ 653asmlinkage long sys32_pause(void) 654{ 655 current->state = TASK_INTERRUPTIBLE; 656 schedule(); 657 return -ERESTARTNOHAND; 658} 659 660asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf, 661 size_t count, u32 poshi, u32 poslo) 662{ 663 if ((compat_ssize_t) count < 0) 664 return -EINVAL; 665 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 666} 667 668asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf, 669 size_t count, u32 poshi, u32 poslo) 670{ 671 if ((compat_ssize_t) count < 0) 672 return -EINVAL; 673 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 674} 675 676asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count) 677{ 678 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count); 679} 680 681asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count) 682{ 683 mm_segment_t old_fs = get_fs(); 684 int ret; 685 off_t of; 686 687 if (offset && get_user(of, offset)) 688 return -EFAULT; 689 690 set_fs(KERNEL_DS); 691 ret = sys_sendfile(out_fd, in_fd, 692 offset ? (off_t __force __user *) &of : NULL, count); 693 set_fs(old_fs); 694 695 if (offset && put_user(of, offset)) 696 return -EFAULT; 697 698 return ret; 699} 700 701asmlinkage long sys32_sendfile64(int out_fd, int in_fd, 702 compat_loff_t __user *offset, s32 count) 703{ 704 mm_segment_t old_fs = get_fs(); 705 int ret; 706 loff_t lof; 707 708 if (offset && get_user(lof, offset)) 709 return -EFAULT; 710 711 set_fs(KERNEL_DS); 712 ret = sys_sendfile64(out_fd, in_fd, 713 offset ? (loff_t __force __user *) &lof : NULL, 714 count); 715 set_fs(old_fs); 716 717 if (offset && put_user(lof, offset)) 718 return -EFAULT; 719 720 return ret; 721} 722 723#ifdef CONFIG_SYSCTL_SYSCALL 724struct __sysctl_args32 { 725 u32 name; 726 int nlen; 727 u32 oldval; 728 u32 oldlenp; 729 u32 newval; 730 u32 newlen; 731 u32 __unused[4]; 732}; 733 734asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args) 735{ 736 struct __sysctl_args32 tmp; 737 int error; 738 size_t oldlen; 739 size_t __user *oldlenp = NULL; 740 unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7; 741 742 if (copy_from_user(&tmp, args, sizeof(tmp))) 743 return -EFAULT; 744 745 if (tmp.oldval && tmp.oldlenp) { 746 /* Duh, this is ugly and might not work if sysctl_args 747 is in read-only memory, but do_sysctl does indirectly 748 a lot of uaccess in both directions and we'd have to 749 basically copy the whole sysctl.c here, and 750 glibc's __sysctl uses rw memory for the structure 751 anyway. */ 752 if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) || 753 put_user(oldlen, (size_t __user *)addr)) 754 return -EFAULT; 755 oldlenp = (size_t __user *)addr; 756 } 757 758 lock_kernel(); 759 error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval), 760 oldlenp, compat_ptr(tmp.newval), tmp.newlen); 761 unlock_kernel(); 762 if (oldlenp) { 763 if (!error) { 764 if (get_user(oldlen, (size_t __user *)addr) || 765 put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp))) 766 error = -EFAULT; 767 } 768 if (copy_to_user(args->__unused, tmp.__unused, 769 sizeof(tmp.__unused))) 770 error = -EFAULT; 771 } 772 return error; 773} 774#endif 775 776struct stat64_emu31 { 777 unsigned long long st_dev; 778 unsigned int __pad1; 779#define STAT64_HAS_BROKEN_ST_INO 1 780 u32 __st_ino; 781 unsigned int st_mode; 782 unsigned int st_nlink; 783 u32 st_uid; 784 u32 st_gid; 785 unsigned long long st_rdev; 786 unsigned int __pad3; 787 long st_size; 788 u32 st_blksize; 789 unsigned char __pad4[4]; 790 u32 __pad5; /* future possible st_blocks high bits */ 791 u32 st_blocks; /* Number 512-byte blocks allocated. */ 792 u32 st_atime; 793 u32 __pad6; 794 u32 st_mtime; 795 u32 __pad7; 796 u32 st_ctime; 797 u32 __pad8; /* will be high 32 bits of ctime someday */ 798 unsigned long st_ino; 799}; 800 801static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat) 802{ 803 struct stat64_emu31 tmp; 804 805 memset(&tmp, 0, sizeof(tmp)); 806 807 tmp.st_dev = huge_encode_dev(stat->dev); 808 tmp.st_ino = stat->ino; 809 tmp.__st_ino = (u32)stat->ino; 810 tmp.st_mode = stat->mode; 811 tmp.st_nlink = (unsigned int)stat->nlink; 812 tmp.st_uid = stat->uid; 813 tmp.st_gid = stat->gid; 814 tmp.st_rdev = huge_encode_dev(stat->rdev); 815 tmp.st_size = stat->size; 816 tmp.st_blksize = (u32)stat->blksize; 817 tmp.st_blocks = (u32)stat->blocks; 818 tmp.st_atime = (u32)stat->atime.tv_sec; 819 tmp.st_mtime = (u32)stat->mtime.tv_sec; 820 tmp.st_ctime = (u32)stat->ctime.tv_sec; 821 822 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 823} 824 825asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf) 826{ 827 struct kstat stat; 828 int ret = vfs_stat(filename, &stat); 829 if (!ret) 830 ret = cp_stat64(statbuf, &stat); 831 return ret; 832} 833 834asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf) 835{ 836 struct kstat stat; 837 int ret = vfs_lstat(filename, &stat); 838 if (!ret) 839 ret = cp_stat64(statbuf, &stat); 840 return ret; 841} 842 843asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf) 844{ 845 struct kstat stat; 846 int ret = vfs_fstat(fd, &stat); 847 if (!ret) 848 ret = cp_stat64(statbuf, &stat); 849 return ret; 850} 851 852asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename, 853 struct stat64_emu31 __user* statbuf, int flag) 854{ 855 struct kstat stat; 856 int error = -EINVAL; 857 858 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) 859 goto out; 860 861 if (flag & AT_SYMLINK_NOFOLLOW) 862 error = vfs_lstat_fd(dfd, filename, &stat); 863 else 864 error = vfs_stat_fd(dfd, filename, &stat); 865 866 if (!error) 867 error = cp_stat64(statbuf, &stat); 868out: 869 return error; 870} 871 872/* 873 * Linux/i386 didn't use to be able to handle more than 874 * 4 system call parameters, so these system calls used a memory 875 * block for parameter passing.. 876 */ 877 878struct mmap_arg_struct_emu31 { 879 u32 addr; 880 u32 len; 881 u32 prot; 882 u32 flags; 883 u32 fd; 884 u32 offset; 885}; 886 887/* common code for old and new mmaps */ 888static inline long do_mmap2( 889 unsigned long addr, unsigned long len, 890 unsigned long prot, unsigned long flags, 891 unsigned long fd, unsigned long pgoff) 892{ 893 struct file * file = NULL; 894 unsigned long error = -EBADF; 895 896 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); 897 if (!(flags & MAP_ANONYMOUS)) { 898 file = fget(fd); 899 if (!file) 900 goto out; 901 } 902 903 down_write(¤t->mm->mmap_sem); 904 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); 905 if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) { 906 /* Result is out of bounds. */ 907 do_munmap(current->mm, addr, len); 908 error = -ENOMEM; 909 } 910 up_write(¤t->mm->mmap_sem); 911 912 if (file) 913 fput(file); 914out: 915 return error; 916} 917 918 919asmlinkage unsigned long 920old32_mmap(struct mmap_arg_struct_emu31 __user *arg) 921{ 922 struct mmap_arg_struct_emu31 a; 923 int error = -EFAULT; 924 925 if (copy_from_user(&a, arg, sizeof(a))) 926 goto out; 927 928 error = -EINVAL; 929 if (a.offset & ~PAGE_MASK) 930 goto out; 931 932 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); 933out: 934 return error; 935} 936 937asmlinkage long 938sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg) 939{ 940 struct mmap_arg_struct_emu31 a; 941 int error = -EFAULT; 942 943 if (copy_from_user(&a, arg, sizeof(a))) 944 goto out; 945 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); 946out: 947 return error; 948} 949 950asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count) 951{ 952 if ((compat_ssize_t) count < 0) 953 return -EINVAL; 954 955 return sys_read(fd, buf, count); 956} 957 958asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count) 959{ 960 if ((compat_ssize_t) count < 0) 961 return -EINVAL; 962 963 return sys_write(fd, buf, count); 964} 965 966asmlinkage long sys32_clone(struct pt_regs regs) 967{ 968 unsigned long clone_flags; 969 unsigned long newsp; 970 int __user *parent_tidptr, *child_tidptr; 971 972 clone_flags = regs.gprs[3] & 0xffffffffUL; 973 newsp = regs.orig_gpr2 & 0x7fffffffUL; 974 parent_tidptr = compat_ptr(regs.gprs[4]); 975 child_tidptr = compat_ptr(regs.gprs[5]); 976 if (!newsp) 977 newsp = regs.gprs[15]; 978 return do_fork(clone_flags, newsp, ®s, 0, 979 parent_tidptr, child_tidptr); 980} 981 982/* 983 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64. 984 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE} 985 * because the 31 bit values differ from the 64 bit values. 986 */ 987 988asmlinkage long 989sys32_fadvise64(int fd, loff_t offset, size_t len, int advise) 990{ 991 if (advise == 4) 992 advise = POSIX_FADV_DONTNEED; 993 else if (advise == 5) 994 advise = POSIX_FADV_NOREUSE; 995 return sys_fadvise64(fd, offset, len, advise); 996} 997 998struct fadvise64_64_args { 999 int fd; 1000 long long offset; 1001 long long len; 1002 int advice; 1003}; 1004 1005asmlinkage long 1006sys32_fadvise64_64(struct fadvise64_64_args __user *args) 1007{ 1008 struct fadvise64_64_args a; 1009 1010 if ( copy_from_user(&a, args, sizeof(a)) ) 1011 return -EFAULT; 1012 if (a.advice == 4) 1013 a.advice = POSIX_FADV_DONTNEED; 1014 else if (a.advice == 5) 1015 a.advice = POSIX_FADV_NOREUSE; 1016 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); 1017} 1018