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