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/smp.h> 28 #include <linux/sem.h> 29 #include <linux/msg.h> 30 #include <linux/shm.h> 31 #include <linux/uio.h> 32 #include <linux/quota.h> 33 #include <linux/module.h> 34 #include <linux/poll.h> 35 #include <linux/personality.h> 36 #include <linux/stat.h> 37 #include <linux/filter.h> 38 #include <linux/highmem.h> 39 #include <linux/highuid.h> 40 #include <linux/mman.h> 41 #include <linux/ipv6.h> 42 #include <linux/in.h> 43 #include <linux/icmpv6.h> 44 #include <linux/syscalls.h> 45 #include <linux/sysctl.h> 46 #include <linux/binfmts.h> 47 #include <linux/capability.h> 48 #include <linux/compat.h> 49 #include <linux/vfs.h> 50 #include <linux/ptrace.h> 51 #include <linux/fadvise.h> 52 #include <linux/ipc.h> 53 #include <linux/slab.h> 54 55 #include <asm/types.h> 56 #include <asm/uaccess.h> 57 58 #include <net/scm.h> 59 #include <net/sock.h> 60 61 #include "compat_linux.h" 62 63 u32 psw32_user_bits = PSW32_MASK_DAT | PSW32_MASK_IO | PSW32_MASK_EXT | 64 PSW32_DEFAULT_KEY | PSW32_MASK_BASE | PSW32_MASK_MCHECK | 65 PSW32_MASK_PSTATE | PSW32_ASC_HOME; 66 67 /* For this source file, we want overflow handling. */ 68 69 #undef high2lowuid 70 #undef high2lowgid 71 #undef low2highuid 72 #undef low2highgid 73 #undef SET_UID16 74 #undef SET_GID16 75 #undef NEW_TO_OLD_UID 76 #undef NEW_TO_OLD_GID 77 #undef SET_OLDSTAT_UID 78 #undef SET_OLDSTAT_GID 79 #undef SET_STAT_UID 80 #undef SET_STAT_GID 81 82 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid) 83 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid) 84 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid) 85 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid) 86 #define SET_UID16(var, uid) var = high2lowuid(uid) 87 #define SET_GID16(var, gid) var = high2lowgid(gid) 88 #define NEW_TO_OLD_UID(uid) high2lowuid(uid) 89 #define NEW_TO_OLD_GID(gid) high2lowgid(gid) 90 #define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid) 91 #define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid) 92 #define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid) 93 #define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid) 94 95 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group) 96 { 97 return sys_chown(filename, low2highuid(user), low2highgid(group)); 98 } 99 100 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group) 101 { 102 return sys_lchown(filename, low2highuid(user), low2highgid(group)); 103 } 104 105 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group) 106 { 107 return sys_fchown(fd, low2highuid(user), low2highgid(group)); 108 } 109 110 asmlinkage long sys32_setregid16(u16 rgid, u16 egid) 111 { 112 return sys_setregid(low2highgid(rgid), low2highgid(egid)); 113 } 114 115 asmlinkage long sys32_setgid16(u16 gid) 116 { 117 return sys_setgid((gid_t)gid); 118 } 119 120 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid) 121 { 122 return sys_setreuid(low2highuid(ruid), low2highuid(euid)); 123 } 124 125 asmlinkage long sys32_setuid16(u16 uid) 126 { 127 return sys_setuid((uid_t)uid); 128 } 129 130 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid) 131 { 132 return sys_setresuid(low2highuid(ruid), low2highuid(euid), 133 low2highuid(suid)); 134 } 135 136 asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid) 137 { 138 int retval; 139 140 if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) && 141 !(retval = put_user(high2lowuid(current->cred->euid), euid))) 142 retval = put_user(high2lowuid(current->cred->suid), suid); 143 144 return retval; 145 } 146 147 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid) 148 { 149 return sys_setresgid(low2highgid(rgid), low2highgid(egid), 150 low2highgid(sgid)); 151 } 152 153 asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid) 154 { 155 int retval; 156 157 if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) && 158 !(retval = put_user(high2lowgid(current->cred->egid), egid))) 159 retval = put_user(high2lowgid(current->cred->sgid), sgid); 160 161 return retval; 162 } 163 164 asmlinkage long sys32_setfsuid16(u16 uid) 165 { 166 return sys_setfsuid((uid_t)uid); 167 } 168 169 asmlinkage long sys32_setfsgid16(u16 gid) 170 { 171 return sys_setfsgid((gid_t)gid); 172 } 173 174 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info) 175 { 176 int i; 177 u16 group; 178 179 for (i = 0; i < group_info->ngroups; i++) { 180 group = (u16)GROUP_AT(group_info, i); 181 if (put_user(group, grouplist+i)) 182 return -EFAULT; 183 } 184 185 return 0; 186 } 187 188 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist) 189 { 190 int i; 191 u16 group; 192 193 for (i = 0; i < group_info->ngroups; i++) { 194 if (get_user(group, grouplist+i)) 195 return -EFAULT; 196 GROUP_AT(group_info, i) = (gid_t)group; 197 } 198 199 return 0; 200 } 201 202 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist) 203 { 204 int i; 205 206 if (gidsetsize < 0) 207 return -EINVAL; 208 209 get_group_info(current->cred->group_info); 210 i = current->cred->group_info->ngroups; 211 if (gidsetsize) { 212 if (i > gidsetsize) { 213 i = -EINVAL; 214 goto out; 215 } 216 if (groups16_to_user(grouplist, current->cred->group_info)) { 217 i = -EFAULT; 218 goto out; 219 } 220 } 221 out: 222 put_group_info(current->cred->group_info); 223 return i; 224 } 225 226 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist) 227 { 228 struct group_info *group_info; 229 int retval; 230 231 if (!capable(CAP_SETGID)) 232 return -EPERM; 233 if ((unsigned)gidsetsize > NGROUPS_MAX) 234 return -EINVAL; 235 236 group_info = groups_alloc(gidsetsize); 237 if (!group_info) 238 return -ENOMEM; 239 retval = groups16_from_user(group_info, grouplist); 240 if (retval) { 241 put_group_info(group_info); 242 return retval; 243 } 244 245 retval = set_current_groups(group_info); 246 put_group_info(group_info); 247 248 return retval; 249 } 250 251 asmlinkage long sys32_getuid16(void) 252 { 253 return high2lowuid(current->cred->uid); 254 } 255 256 asmlinkage long sys32_geteuid16(void) 257 { 258 return high2lowuid(current->cred->euid); 259 } 260 261 asmlinkage long sys32_getgid16(void) 262 { 263 return high2lowgid(current->cred->gid); 264 } 265 266 asmlinkage long sys32_getegid16(void) 267 { 268 return high2lowgid(current->cred->egid); 269 } 270 271 /* 272 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation. 273 * 274 * This is really horribly ugly. 275 */ 276 #ifdef CONFIG_SYSVIPC 277 asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr) 278 { 279 if (call >> 16) /* hack for backward compatibility */ 280 return -EINVAL; 281 switch (call) { 282 case SEMTIMEDOP: 283 return compat_sys_semtimedop(first, compat_ptr(ptr), 284 second, compat_ptr(third)); 285 case SEMOP: 286 /* struct sembuf is the same on 32 and 64bit :)) */ 287 return sys_semtimedop(first, compat_ptr(ptr), 288 second, NULL); 289 case SEMGET: 290 return sys_semget(first, second, third); 291 case SEMCTL: 292 return compat_sys_semctl(first, second, third, 293 compat_ptr(ptr)); 294 case MSGSND: 295 return compat_sys_msgsnd(first, second, third, 296 compat_ptr(ptr)); 297 case MSGRCV: 298 return compat_sys_msgrcv(first, second, 0, third, 299 0, compat_ptr(ptr)); 300 case MSGGET: 301 return sys_msgget((key_t) first, second); 302 case MSGCTL: 303 return compat_sys_msgctl(first, second, compat_ptr(ptr)); 304 case SHMAT: 305 return compat_sys_shmat(first, second, third, 306 0, compat_ptr(ptr)); 307 case SHMDT: 308 return sys_shmdt(compat_ptr(ptr)); 309 case SHMGET: 310 return sys_shmget(first, (unsigned)second, third); 311 case SHMCTL: 312 return compat_sys_shmctl(first, second, compat_ptr(ptr)); 313 } 314 315 return -ENOSYS; 316 } 317 #endif 318 319 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low) 320 { 321 if ((int)high < 0) 322 return -EINVAL; 323 else 324 return sys_truncate(path, (high << 32) | low); 325 } 326 327 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low) 328 { 329 if ((int)high < 0) 330 return -EINVAL; 331 else 332 return sys_ftruncate(fd, (high << 32) | low); 333 } 334 335 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid, 336 struct compat_timespec __user *interval) 337 { 338 struct timespec t; 339 int ret; 340 mm_segment_t old_fs = get_fs (); 341 342 set_fs (KERNEL_DS); 343 ret = sys_sched_rr_get_interval(pid, 344 (struct timespec __force __user *) &t); 345 set_fs (old_fs); 346 if (put_compat_timespec(&t, interval)) 347 return -EFAULT; 348 return ret; 349 } 350 351 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set, 352 compat_sigset_t __user *oset, size_t sigsetsize) 353 { 354 sigset_t s; 355 compat_sigset_t s32; 356 int ret; 357 mm_segment_t old_fs = get_fs(); 358 359 if (set) { 360 if (copy_from_user (&s32, set, sizeof(compat_sigset_t))) 361 return -EFAULT; 362 s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); 363 } 364 set_fs (KERNEL_DS); 365 ret = sys_rt_sigprocmask(how, 366 set ? (sigset_t __force __user *) &s : NULL, 367 oset ? (sigset_t __force __user *) &s : NULL, 368 sigsetsize); 369 set_fs (old_fs); 370 if (ret) return ret; 371 if (oset) { 372 s32.sig[1] = (s.sig[0] >> 32); 373 s32.sig[0] = s.sig[0]; 374 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t))) 375 return -EFAULT; 376 } 377 return 0; 378 } 379 380 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set, 381 size_t sigsetsize) 382 { 383 sigset_t s; 384 compat_sigset_t s32; 385 int ret; 386 mm_segment_t old_fs = get_fs(); 387 388 set_fs (KERNEL_DS); 389 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize); 390 set_fs (old_fs); 391 if (!ret) { 392 s32.sig[1] = (s.sig[0] >> 32); 393 s32.sig[0] = s.sig[0]; 394 if (copy_to_user (set, &s32, sizeof(compat_sigset_t))) 395 return -EFAULT; 396 } 397 return ret; 398 } 399 400 asmlinkage long 401 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo) 402 { 403 siginfo_t info; 404 int ret; 405 mm_segment_t old_fs = get_fs(); 406 407 if (copy_siginfo_from_user32(&info, uinfo)) 408 return -EFAULT; 409 set_fs (KERNEL_DS); 410 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info); 411 set_fs (old_fs); 412 return ret; 413 } 414 415 /* 416 * sys32_execve() executes a new program after the asm stub has set 417 * things up for us. This should basically do what I want it to. 418 */ 419 asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv, 420 compat_uptr_t __user *envp) 421 { 422 struct pt_regs *regs = task_pt_regs(current); 423 char *filename; 424 long rc; 425 426 filename = getname(name); 427 rc = PTR_ERR(filename); 428 if (IS_ERR(filename)) 429 return rc; 430 rc = compat_do_execve(filename, argv, envp, regs); 431 if (rc) 432 goto out; 433 current->thread.fp_regs.fpc=0; 434 asm volatile("sfpc %0,0" : : "d" (0)); 435 rc = regs->gprs[2]; 436 out: 437 putname(filename); 438 return rc; 439 } 440 441 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf, 442 size_t count, u32 poshi, u32 poslo) 443 { 444 if ((compat_ssize_t) count < 0) 445 return -EINVAL; 446 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 447 } 448 449 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf, 450 size_t count, u32 poshi, u32 poslo) 451 { 452 if ((compat_ssize_t) count < 0) 453 return -EINVAL; 454 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 455 } 456 457 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count) 458 { 459 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count); 460 } 461 462 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count) 463 { 464 mm_segment_t old_fs = get_fs(); 465 int ret; 466 off_t of; 467 468 if (offset && get_user(of, offset)) 469 return -EFAULT; 470 471 set_fs(KERNEL_DS); 472 ret = sys_sendfile(out_fd, in_fd, 473 offset ? (off_t __force __user *) &of : NULL, count); 474 set_fs(old_fs); 475 476 if (offset && put_user(of, offset)) 477 return -EFAULT; 478 479 return ret; 480 } 481 482 asmlinkage long sys32_sendfile64(int out_fd, int in_fd, 483 compat_loff_t __user *offset, s32 count) 484 { 485 mm_segment_t old_fs = get_fs(); 486 int ret; 487 loff_t lof; 488 489 if (offset && get_user(lof, offset)) 490 return -EFAULT; 491 492 set_fs(KERNEL_DS); 493 ret = sys_sendfile64(out_fd, in_fd, 494 offset ? (loff_t __force __user *) &lof : NULL, 495 count); 496 set_fs(old_fs); 497 498 if (offset && put_user(lof, offset)) 499 return -EFAULT; 500 501 return ret; 502 } 503 504 struct stat64_emu31 { 505 unsigned long long st_dev; 506 unsigned int __pad1; 507 #define STAT64_HAS_BROKEN_ST_INO 1 508 u32 __st_ino; 509 unsigned int st_mode; 510 unsigned int st_nlink; 511 u32 st_uid; 512 u32 st_gid; 513 unsigned long long st_rdev; 514 unsigned int __pad3; 515 long st_size; 516 u32 st_blksize; 517 unsigned char __pad4[4]; 518 u32 __pad5; /* future possible st_blocks high bits */ 519 u32 st_blocks; /* Number 512-byte blocks allocated. */ 520 u32 st_atime; 521 u32 __pad6; 522 u32 st_mtime; 523 u32 __pad7; 524 u32 st_ctime; 525 u32 __pad8; /* will be high 32 bits of ctime someday */ 526 unsigned long st_ino; 527 }; 528 529 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat) 530 { 531 struct stat64_emu31 tmp; 532 533 memset(&tmp, 0, sizeof(tmp)); 534 535 tmp.st_dev = huge_encode_dev(stat->dev); 536 tmp.st_ino = stat->ino; 537 tmp.__st_ino = (u32)stat->ino; 538 tmp.st_mode = stat->mode; 539 tmp.st_nlink = (unsigned int)stat->nlink; 540 tmp.st_uid = stat->uid; 541 tmp.st_gid = stat->gid; 542 tmp.st_rdev = huge_encode_dev(stat->rdev); 543 tmp.st_size = stat->size; 544 tmp.st_blksize = (u32)stat->blksize; 545 tmp.st_blocks = (u32)stat->blocks; 546 tmp.st_atime = (u32)stat->atime.tv_sec; 547 tmp.st_mtime = (u32)stat->mtime.tv_sec; 548 tmp.st_ctime = (u32)stat->ctime.tv_sec; 549 550 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 551 } 552 553 asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf) 554 { 555 struct kstat stat; 556 int ret = vfs_stat(filename, &stat); 557 if (!ret) 558 ret = cp_stat64(statbuf, &stat); 559 return ret; 560 } 561 562 asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf) 563 { 564 struct kstat stat; 565 int ret = vfs_lstat(filename, &stat); 566 if (!ret) 567 ret = cp_stat64(statbuf, &stat); 568 return ret; 569 } 570 571 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf) 572 { 573 struct kstat stat; 574 int ret = vfs_fstat(fd, &stat); 575 if (!ret) 576 ret = cp_stat64(statbuf, &stat); 577 return ret; 578 } 579 580 asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename, 581 struct stat64_emu31 __user* statbuf, int flag) 582 { 583 struct kstat stat; 584 int error; 585 586 error = vfs_fstatat(dfd, filename, &stat, flag); 587 if (error) 588 return error; 589 return cp_stat64(statbuf, &stat); 590 } 591 592 /* 593 * Linux/i386 didn't use to be able to handle more than 594 * 4 system call parameters, so these system calls used a memory 595 * block for parameter passing.. 596 */ 597 598 struct mmap_arg_struct_emu31 { 599 compat_ulong_t addr; 600 compat_ulong_t len; 601 compat_ulong_t prot; 602 compat_ulong_t flags; 603 compat_ulong_t fd; 604 compat_ulong_t offset; 605 }; 606 607 asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg) 608 { 609 struct mmap_arg_struct_emu31 a; 610 611 if (copy_from_user(&a, arg, sizeof(a))) 612 return -EFAULT; 613 if (a.offset & ~PAGE_MASK) 614 return -EINVAL; 615 a.addr = (unsigned long) compat_ptr(a.addr); 616 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, 617 a.offset >> PAGE_SHIFT); 618 } 619 620 asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg) 621 { 622 struct mmap_arg_struct_emu31 a; 623 624 if (copy_from_user(&a, arg, sizeof(a))) 625 return -EFAULT; 626 a.addr = (unsigned long) compat_ptr(a.addr); 627 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); 628 } 629 630 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count) 631 { 632 if ((compat_ssize_t) count < 0) 633 return -EINVAL; 634 635 return sys_read(fd, buf, count); 636 } 637 638 asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count) 639 { 640 if ((compat_ssize_t) count < 0) 641 return -EINVAL; 642 643 return sys_write(fd, buf, count); 644 } 645 646 /* 647 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64. 648 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE} 649 * because the 31 bit values differ from the 64 bit values. 650 */ 651 652 asmlinkage long 653 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise) 654 { 655 if (advise == 4) 656 advise = POSIX_FADV_DONTNEED; 657 else if (advise == 5) 658 advise = POSIX_FADV_NOREUSE; 659 return sys_fadvise64(fd, offset, len, advise); 660 } 661 662 struct fadvise64_64_args { 663 int fd; 664 long long offset; 665 long long len; 666 int advice; 667 }; 668 669 asmlinkage long 670 sys32_fadvise64_64(struct fadvise64_64_args __user *args) 671 { 672 struct fadvise64_64_args a; 673 674 if ( copy_from_user(&a, args, sizeof(a)) ) 675 return -EFAULT; 676 if (a.advice == 4) 677 a.advice = POSIX_FADV_DONTNEED; 678 else if (a.advice == 5) 679 a.advice = POSIX_FADV_NOREUSE; 680 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); 681 } 682