1 /* 2 * S390 version 3 * Copyright IBM Corp. 2000 4 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 5 * Gerhard Tonn (ton@de.ibm.com) 6 * Thomas Spatzier (tspat@de.ibm.com) 7 * 8 * Conversion between 31bit and 64bit native syscalls. 9 * 10 * Heavily inspired by the 32-bit Sparc compat code which is 11 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 12 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) 13 * 14 */ 15 16 17 #include <linux/kernel.h> 18 #include <linux/sched.h> 19 #include <linux/fs.h> 20 #include <linux/mm.h> 21 #include <linux/file.h> 22 #include <linux/signal.h> 23 #include <linux/resource.h> 24 #include <linux/times.h> 25 #include <linux/smp.h> 26 #include <linux/sem.h> 27 #include <linux/msg.h> 28 #include <linux/shm.h> 29 #include <linux/uio.h> 30 #include <linux/quota.h> 31 #include <linux/module.h> 32 #include <linux/poll.h> 33 #include <linux/personality.h> 34 #include <linux/stat.h> 35 #include <linux/filter.h> 36 #include <linux/highmem.h> 37 #include <linux/highuid.h> 38 #include <linux/mman.h> 39 #include <linux/ipv6.h> 40 #include <linux/in.h> 41 #include <linux/icmpv6.h> 42 #include <linux/syscalls.h> 43 #include <linux/sysctl.h> 44 #include <linux/binfmts.h> 45 #include <linux/capability.h> 46 #include <linux/compat.h> 47 #include <linux/vfs.h> 48 #include <linux/ptrace.h> 49 #include <linux/fadvise.h> 50 #include <linux/ipc.h> 51 #include <linux/slab.h> 52 53 #include <asm/types.h> 54 #include <asm/uaccess.h> 55 56 #include <net/scm.h> 57 #include <net/sock.h> 58 59 #include "compat_linux.h" 60 61 u32 psw32_user_bits = PSW32_MASK_DAT | PSW32_MASK_IO | PSW32_MASK_EXT | 62 PSW32_DEFAULT_KEY | PSW32_MASK_BASE | PSW32_MASK_MCHECK | 63 PSW32_MASK_PSTATE | PSW32_ASC_HOME; 64 65 /* For this source file, we want overflow handling. */ 66 67 #undef high2lowuid 68 #undef high2lowgid 69 #undef low2highuid 70 #undef low2highgid 71 #undef SET_UID16 72 #undef SET_GID16 73 #undef NEW_TO_OLD_UID 74 #undef NEW_TO_OLD_GID 75 #undef SET_OLDSTAT_UID 76 #undef SET_OLDSTAT_GID 77 #undef SET_STAT_UID 78 #undef SET_STAT_GID 79 80 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid) 81 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid) 82 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid) 83 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid) 84 #define SET_UID16(var, uid) var = high2lowuid(uid) 85 #define SET_GID16(var, gid) var = high2lowgid(gid) 86 #define NEW_TO_OLD_UID(uid) high2lowuid(uid) 87 #define NEW_TO_OLD_GID(gid) high2lowgid(gid) 88 #define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid) 89 #define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid) 90 #define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid) 91 #define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid) 92 93 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group) 94 { 95 return sys_chown(filename, low2highuid(user), low2highgid(group)); 96 } 97 98 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group) 99 { 100 return sys_lchown(filename, low2highuid(user), low2highgid(group)); 101 } 102 103 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group) 104 { 105 return sys_fchown(fd, low2highuid(user), low2highgid(group)); 106 } 107 108 asmlinkage long sys32_setregid16(u16 rgid, u16 egid) 109 { 110 return sys_setregid(low2highgid(rgid), low2highgid(egid)); 111 } 112 113 asmlinkage long sys32_setgid16(u16 gid) 114 { 115 return sys_setgid((gid_t)gid); 116 } 117 118 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid) 119 { 120 return sys_setreuid(low2highuid(ruid), low2highuid(euid)); 121 } 122 123 asmlinkage long sys32_setuid16(u16 uid) 124 { 125 return sys_setuid((uid_t)uid); 126 } 127 128 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid) 129 { 130 return sys_setresuid(low2highuid(ruid), low2highuid(euid), 131 low2highuid(suid)); 132 } 133 134 asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid) 135 { 136 int retval; 137 138 if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) && 139 !(retval = put_user(high2lowuid(current->cred->euid), euid))) 140 retval = put_user(high2lowuid(current->cred->suid), suid); 141 142 return retval; 143 } 144 145 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid) 146 { 147 return sys_setresgid(low2highgid(rgid), low2highgid(egid), 148 low2highgid(sgid)); 149 } 150 151 asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid) 152 { 153 int retval; 154 155 if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) && 156 !(retval = put_user(high2lowgid(current->cred->egid), egid))) 157 retval = put_user(high2lowgid(current->cred->sgid), sgid); 158 159 return retval; 160 } 161 162 asmlinkage long sys32_setfsuid16(u16 uid) 163 { 164 return sys_setfsuid((uid_t)uid); 165 } 166 167 asmlinkage long sys32_setfsgid16(u16 gid) 168 { 169 return sys_setfsgid((gid_t)gid); 170 } 171 172 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info) 173 { 174 struct user_namespace *user_ns = current_user_ns(); 175 int i; 176 u16 group; 177 kgid_t kgid; 178 179 for (i = 0; i < group_info->ngroups; i++) { 180 kgid = GROUP_AT(group_info, i); 181 group = (u16)from_kgid_munged(user_ns, kgid); 182 if (put_user(group, grouplist+i)) 183 return -EFAULT; 184 } 185 186 return 0; 187 } 188 189 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist) 190 { 191 struct user_namespace *user_ns = current_user_ns(); 192 int i; 193 u16 group; 194 kgid_t kgid; 195 196 for (i = 0; i < group_info->ngroups; i++) { 197 if (get_user(group, grouplist+i)) 198 return -EFAULT; 199 200 kgid = make_kgid(user_ns, (gid_t)group); 201 if (!gid_valid(kgid)) 202 return -EINVAL; 203 204 GROUP_AT(group_info, i) = kgid; 205 } 206 207 return 0; 208 } 209 210 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist) 211 { 212 int i; 213 214 if (gidsetsize < 0) 215 return -EINVAL; 216 217 get_group_info(current->cred->group_info); 218 i = current->cred->group_info->ngroups; 219 if (gidsetsize) { 220 if (i > gidsetsize) { 221 i = -EINVAL; 222 goto out; 223 } 224 if (groups16_to_user(grouplist, current->cred->group_info)) { 225 i = -EFAULT; 226 goto out; 227 } 228 } 229 out: 230 put_group_info(current->cred->group_info); 231 return i; 232 } 233 234 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist) 235 { 236 struct group_info *group_info; 237 int retval; 238 239 if (!capable(CAP_SETGID)) 240 return -EPERM; 241 if ((unsigned)gidsetsize > NGROUPS_MAX) 242 return -EINVAL; 243 244 group_info = groups_alloc(gidsetsize); 245 if (!group_info) 246 return -ENOMEM; 247 retval = groups16_from_user(group_info, grouplist); 248 if (retval) { 249 put_group_info(group_info); 250 return retval; 251 } 252 253 retval = set_current_groups(group_info); 254 put_group_info(group_info); 255 256 return retval; 257 } 258 259 asmlinkage long sys32_getuid16(void) 260 { 261 return high2lowuid(current->cred->uid); 262 } 263 264 asmlinkage long sys32_geteuid16(void) 265 { 266 return high2lowuid(current->cred->euid); 267 } 268 269 asmlinkage long sys32_getgid16(void) 270 { 271 return high2lowgid(current->cred->gid); 272 } 273 274 asmlinkage long sys32_getegid16(void) 275 { 276 return high2lowgid(current->cred->egid); 277 } 278 279 /* 280 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation. 281 * 282 * This is really horribly ugly. 283 */ 284 #ifdef CONFIG_SYSVIPC 285 asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr) 286 { 287 if (call >> 16) /* hack for backward compatibility */ 288 return -EINVAL; 289 switch (call) { 290 case SEMTIMEDOP: 291 return compat_sys_semtimedop(first, compat_ptr(ptr), 292 second, compat_ptr(third)); 293 case SEMOP: 294 /* struct sembuf is the same on 32 and 64bit :)) */ 295 return sys_semtimedop(first, compat_ptr(ptr), 296 second, NULL); 297 case SEMGET: 298 return sys_semget(first, second, third); 299 case SEMCTL: 300 return compat_sys_semctl(first, second, third, 301 compat_ptr(ptr)); 302 case MSGSND: 303 return compat_sys_msgsnd(first, second, third, 304 compat_ptr(ptr)); 305 case MSGRCV: 306 return compat_sys_msgrcv(first, second, 0, third, 307 0, compat_ptr(ptr)); 308 case MSGGET: 309 return sys_msgget((key_t) first, second); 310 case MSGCTL: 311 return compat_sys_msgctl(first, second, compat_ptr(ptr)); 312 case SHMAT: 313 return compat_sys_shmat(first, second, third, 314 0, compat_ptr(ptr)); 315 case SHMDT: 316 return sys_shmdt(compat_ptr(ptr)); 317 case SHMGET: 318 return sys_shmget(first, (unsigned)second, third); 319 case SHMCTL: 320 return compat_sys_shmctl(first, second, compat_ptr(ptr)); 321 } 322 323 return -ENOSYS; 324 } 325 #endif 326 327 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low) 328 { 329 if ((int)high < 0) 330 return -EINVAL; 331 else 332 return sys_truncate(path, (high << 32) | low); 333 } 334 335 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low) 336 { 337 if ((int)high < 0) 338 return -EINVAL; 339 else 340 return sys_ftruncate(fd, (high << 32) | low); 341 } 342 343 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid, 344 struct compat_timespec __user *interval) 345 { 346 struct timespec t; 347 int ret; 348 mm_segment_t old_fs = get_fs (); 349 350 set_fs (KERNEL_DS); 351 ret = sys_sched_rr_get_interval(pid, 352 (struct timespec __force __user *) &t); 353 set_fs (old_fs); 354 if (put_compat_timespec(&t, interval)) 355 return -EFAULT; 356 return ret; 357 } 358 359 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set, 360 compat_sigset_t __user *oset, size_t sigsetsize) 361 { 362 sigset_t s; 363 compat_sigset_t s32; 364 int ret; 365 mm_segment_t old_fs = get_fs(); 366 367 if (set) { 368 if (copy_from_user (&s32, set, sizeof(compat_sigset_t))) 369 return -EFAULT; 370 s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); 371 } 372 set_fs (KERNEL_DS); 373 ret = sys_rt_sigprocmask(how, 374 set ? (sigset_t __force __user *) &s : NULL, 375 oset ? (sigset_t __force __user *) &s : NULL, 376 sigsetsize); 377 set_fs (old_fs); 378 if (ret) return ret; 379 if (oset) { 380 s32.sig[1] = (s.sig[0] >> 32); 381 s32.sig[0] = s.sig[0]; 382 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t))) 383 return -EFAULT; 384 } 385 return 0; 386 } 387 388 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set, 389 size_t sigsetsize) 390 { 391 sigset_t s; 392 compat_sigset_t s32; 393 int ret; 394 mm_segment_t old_fs = get_fs(); 395 396 set_fs (KERNEL_DS); 397 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize); 398 set_fs (old_fs); 399 if (!ret) { 400 s32.sig[1] = (s.sig[0] >> 32); 401 s32.sig[0] = s.sig[0]; 402 if (copy_to_user (set, &s32, sizeof(compat_sigset_t))) 403 return -EFAULT; 404 } 405 return ret; 406 } 407 408 asmlinkage long 409 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo) 410 { 411 siginfo_t info; 412 int ret; 413 mm_segment_t old_fs = get_fs(); 414 415 if (copy_siginfo_from_user32(&info, uinfo)) 416 return -EFAULT; 417 set_fs (KERNEL_DS); 418 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info); 419 set_fs (old_fs); 420 return ret; 421 } 422 423 /* 424 * sys32_execve() executes a new program after the asm stub has set 425 * things up for us. This should basically do what I want it to. 426 */ 427 asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv, 428 compat_uptr_t __user *envp) 429 { 430 struct pt_regs *regs = task_pt_regs(current); 431 char *filename; 432 long rc; 433 434 filename = getname(name); 435 rc = PTR_ERR(filename); 436 if (IS_ERR(filename)) 437 return rc; 438 rc = compat_do_execve(filename, argv, envp, regs); 439 if (rc) 440 goto out; 441 current->thread.fp_regs.fpc=0; 442 asm volatile("sfpc %0,0" : : "d" (0)); 443 rc = regs->gprs[2]; 444 out: 445 putname(filename); 446 return rc; 447 } 448 449 asmlinkage long sys32_pread64(unsigned int fd, 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_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 455 } 456 457 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf, 458 size_t count, u32 poshi, u32 poslo) 459 { 460 if ((compat_ssize_t) count < 0) 461 return -EINVAL; 462 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 463 } 464 465 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count) 466 { 467 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count); 468 } 469 470 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count) 471 { 472 mm_segment_t old_fs = get_fs(); 473 int ret; 474 off_t of; 475 476 if (offset && get_user(of, offset)) 477 return -EFAULT; 478 479 set_fs(KERNEL_DS); 480 ret = sys_sendfile(out_fd, in_fd, 481 offset ? (off_t __force __user *) &of : NULL, count); 482 set_fs(old_fs); 483 484 if (offset && put_user(of, offset)) 485 return -EFAULT; 486 487 return ret; 488 } 489 490 asmlinkage long sys32_sendfile64(int out_fd, int in_fd, 491 compat_loff_t __user *offset, s32 count) 492 { 493 mm_segment_t old_fs = get_fs(); 494 int ret; 495 loff_t lof; 496 497 if (offset && get_user(lof, offset)) 498 return -EFAULT; 499 500 set_fs(KERNEL_DS); 501 ret = sys_sendfile64(out_fd, in_fd, 502 offset ? (loff_t __force __user *) &lof : NULL, 503 count); 504 set_fs(old_fs); 505 506 if (offset && put_user(lof, offset)) 507 return -EFAULT; 508 509 return ret; 510 } 511 512 struct stat64_emu31 { 513 unsigned long long st_dev; 514 unsigned int __pad1; 515 #define STAT64_HAS_BROKEN_ST_INO 1 516 u32 __st_ino; 517 unsigned int st_mode; 518 unsigned int st_nlink; 519 u32 st_uid; 520 u32 st_gid; 521 unsigned long long st_rdev; 522 unsigned int __pad3; 523 long st_size; 524 u32 st_blksize; 525 unsigned char __pad4[4]; 526 u32 __pad5; /* future possible st_blocks high bits */ 527 u32 st_blocks; /* Number 512-byte blocks allocated. */ 528 u32 st_atime; 529 u32 __pad6; 530 u32 st_mtime; 531 u32 __pad7; 532 u32 st_ctime; 533 u32 __pad8; /* will be high 32 bits of ctime someday */ 534 unsigned long st_ino; 535 }; 536 537 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat) 538 { 539 struct stat64_emu31 tmp; 540 541 memset(&tmp, 0, sizeof(tmp)); 542 543 tmp.st_dev = huge_encode_dev(stat->dev); 544 tmp.st_ino = stat->ino; 545 tmp.__st_ino = (u32)stat->ino; 546 tmp.st_mode = stat->mode; 547 tmp.st_nlink = (unsigned int)stat->nlink; 548 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); 549 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); 550 tmp.st_rdev = huge_encode_dev(stat->rdev); 551 tmp.st_size = stat->size; 552 tmp.st_blksize = (u32)stat->blksize; 553 tmp.st_blocks = (u32)stat->blocks; 554 tmp.st_atime = (u32)stat->atime.tv_sec; 555 tmp.st_mtime = (u32)stat->mtime.tv_sec; 556 tmp.st_ctime = (u32)stat->ctime.tv_sec; 557 558 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 559 } 560 561 asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf) 562 { 563 struct kstat stat; 564 int ret = vfs_stat(filename, &stat); 565 if (!ret) 566 ret = cp_stat64(statbuf, &stat); 567 return ret; 568 } 569 570 asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf) 571 { 572 struct kstat stat; 573 int ret = vfs_lstat(filename, &stat); 574 if (!ret) 575 ret = cp_stat64(statbuf, &stat); 576 return ret; 577 } 578 579 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf) 580 { 581 struct kstat stat; 582 int ret = vfs_fstat(fd, &stat); 583 if (!ret) 584 ret = cp_stat64(statbuf, &stat); 585 return ret; 586 } 587 588 asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename, 589 struct stat64_emu31 __user* statbuf, int flag) 590 { 591 struct kstat stat; 592 int error; 593 594 error = vfs_fstatat(dfd, filename, &stat, flag); 595 if (error) 596 return error; 597 return cp_stat64(statbuf, &stat); 598 } 599 600 /* 601 * Linux/i386 didn't use to be able to handle more than 602 * 4 system call parameters, so these system calls used a memory 603 * block for parameter passing.. 604 */ 605 606 struct mmap_arg_struct_emu31 { 607 compat_ulong_t addr; 608 compat_ulong_t len; 609 compat_ulong_t prot; 610 compat_ulong_t flags; 611 compat_ulong_t fd; 612 compat_ulong_t offset; 613 }; 614 615 asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg) 616 { 617 struct mmap_arg_struct_emu31 a; 618 619 if (copy_from_user(&a, arg, sizeof(a))) 620 return -EFAULT; 621 if (a.offset & ~PAGE_MASK) 622 return -EINVAL; 623 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, 624 a.offset >> PAGE_SHIFT); 625 } 626 627 asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg) 628 { 629 struct mmap_arg_struct_emu31 a; 630 631 if (copy_from_user(&a, arg, sizeof(a))) 632 return -EFAULT; 633 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); 634 } 635 636 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count) 637 { 638 if ((compat_ssize_t) count < 0) 639 return -EINVAL; 640 641 return sys_read(fd, buf, count); 642 } 643 644 asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count) 645 { 646 if ((compat_ssize_t) count < 0) 647 return -EINVAL; 648 649 return sys_write(fd, buf, count); 650 } 651 652 /* 653 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64. 654 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE} 655 * because the 31 bit values differ from the 64 bit values. 656 */ 657 658 asmlinkage long 659 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise) 660 { 661 if (advise == 4) 662 advise = POSIX_FADV_DONTNEED; 663 else if (advise == 5) 664 advise = POSIX_FADV_NOREUSE; 665 return sys_fadvise64(fd, offset, len, advise); 666 } 667 668 struct fadvise64_64_args { 669 int fd; 670 long long offset; 671 long long len; 672 int advice; 673 }; 674 675 asmlinkage long 676 sys32_fadvise64_64(struct fadvise64_64_args __user *args) 677 { 678 struct fadvise64_64_args a; 679 680 if ( copy_from_user(&a, args, sizeof(a)) ) 681 return -EFAULT; 682 if (a.advice == 4) 683 a.advice = POSIX_FADV_DONTNEED; 684 else if (a.advice == 5) 685 a.advice = POSIX_FADV_NOREUSE; 686 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); 687 } 688