compat_linux.c revision d7b5427cec79d993459c162db67eac9e22135e8b
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 61u32 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 93asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group) 94{ 95 return sys_chown(filename, low2highuid(user), low2highgid(group)); 96} 97 98asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group) 99{ 100 return sys_lchown(filename, low2highuid(user), low2highgid(group)); 101} 102 103asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group) 104{ 105 return sys_fchown(fd, low2highuid(user), low2highgid(group)); 106} 107 108asmlinkage long sys32_setregid16(u16 rgid, u16 egid) 109{ 110 return sys_setregid(low2highgid(rgid), low2highgid(egid)); 111} 112 113asmlinkage long sys32_setgid16(u16 gid) 114{ 115 return sys_setgid((gid_t)gid); 116} 117 118asmlinkage long sys32_setreuid16(u16 ruid, u16 euid) 119{ 120 return sys_setreuid(low2highuid(ruid), low2highuid(euid)); 121} 122 123asmlinkage long sys32_setuid16(u16 uid) 124{ 125 return sys_setuid((uid_t)uid); 126} 127 128asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid) 129{ 130 return sys_setresuid(low2highuid(ruid), low2highuid(euid), 131 low2highuid(suid)); 132} 133 134asmlinkage long sys32_getresuid16(u16 __user *ruidp, u16 __user *euidp, u16 __user *suidp) 135{ 136 const struct cred *cred = current_cred(); 137 int retval; 138 u16 ruid, euid, suid; 139 140 ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid)); 141 euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid)); 142 suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid)); 143 144 if (!(retval = put_user(ruid, ruidp)) && 145 !(retval = put_user(euid, euidp))) 146 retval = put_user(suid, suidp); 147 148 return retval; 149} 150 151asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid) 152{ 153 return sys_setresgid(low2highgid(rgid), low2highgid(egid), 154 low2highgid(sgid)); 155} 156 157asmlinkage long sys32_getresgid16(u16 __user *rgidp, u16 __user *egidp, u16 __user *sgidp) 158{ 159 const struct cred *cred = current_cred(); 160 int retval; 161 u16 rgid, egid, sgid; 162 163 rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid)); 164 egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid)); 165 sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid)); 166 167 if (!(retval = put_user(rgid, rgidp)) && 168 !(retval = put_user(egid, egidp))) 169 retval = put_user(sgid, sgidp); 170 171 return retval; 172} 173 174asmlinkage long sys32_setfsuid16(u16 uid) 175{ 176 return sys_setfsuid((uid_t)uid); 177} 178 179asmlinkage long sys32_setfsgid16(u16 gid) 180{ 181 return sys_setfsgid((gid_t)gid); 182} 183 184static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info) 185{ 186 struct user_namespace *user_ns = current_user_ns(); 187 int i; 188 u16 group; 189 kgid_t kgid; 190 191 for (i = 0; i < group_info->ngroups; i++) { 192 kgid = GROUP_AT(group_info, i); 193 group = (u16)from_kgid_munged(user_ns, kgid); 194 if (put_user(group, grouplist+i)) 195 return -EFAULT; 196 } 197 198 return 0; 199} 200 201static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist) 202{ 203 struct user_namespace *user_ns = current_user_ns(); 204 int i; 205 u16 group; 206 kgid_t kgid; 207 208 for (i = 0; i < group_info->ngroups; i++) { 209 if (get_user(group, grouplist+i)) 210 return -EFAULT; 211 212 kgid = make_kgid(user_ns, (gid_t)group); 213 if (!gid_valid(kgid)) 214 return -EINVAL; 215 216 GROUP_AT(group_info, i) = kgid; 217 } 218 219 return 0; 220} 221 222asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist) 223{ 224 int i; 225 226 if (gidsetsize < 0) 227 return -EINVAL; 228 229 get_group_info(current->cred->group_info); 230 i = current->cred->group_info->ngroups; 231 if (gidsetsize) { 232 if (i > gidsetsize) { 233 i = -EINVAL; 234 goto out; 235 } 236 if (groups16_to_user(grouplist, current->cred->group_info)) { 237 i = -EFAULT; 238 goto out; 239 } 240 } 241out: 242 put_group_info(current->cred->group_info); 243 return i; 244} 245 246asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist) 247{ 248 struct group_info *group_info; 249 int retval; 250 251 if (!capable(CAP_SETGID)) 252 return -EPERM; 253 if ((unsigned)gidsetsize > NGROUPS_MAX) 254 return -EINVAL; 255 256 group_info = groups_alloc(gidsetsize); 257 if (!group_info) 258 return -ENOMEM; 259 retval = groups16_from_user(group_info, grouplist); 260 if (retval) { 261 put_group_info(group_info); 262 return retval; 263 } 264 265 retval = set_current_groups(group_info); 266 put_group_info(group_info); 267 268 return retval; 269} 270 271asmlinkage long sys32_getuid16(void) 272{ 273 return high2lowuid(from_kuid_munged(current_user_ns(), current_uid())); 274} 275 276asmlinkage long sys32_geteuid16(void) 277{ 278 return high2lowuid(from_kuid_munged(current_user_ns(), current_euid())); 279} 280 281asmlinkage long sys32_getgid16(void) 282{ 283 return high2lowgid(from_kgid_munged(current_user_ns(), current_gid())); 284} 285 286asmlinkage long sys32_getegid16(void) 287{ 288 return high2lowgid(from_kgid_munged(current_user_ns(), current_egid())); 289} 290 291/* 292 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation. 293 * 294 * This is really horribly ugly. 295 */ 296#ifdef CONFIG_SYSVIPC 297asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr) 298{ 299 if (call >> 16) /* hack for backward compatibility */ 300 return -EINVAL; 301 switch (call) { 302 case SEMTIMEDOP: 303 return compat_sys_semtimedop(first, compat_ptr(ptr), 304 second, compat_ptr(third)); 305 case SEMOP: 306 /* struct sembuf is the same on 32 and 64bit :)) */ 307 return sys_semtimedop(first, compat_ptr(ptr), 308 second, NULL); 309 case SEMGET: 310 return sys_semget(first, second, third); 311 case SEMCTL: 312 return compat_sys_semctl(first, second, third, 313 compat_ptr(ptr)); 314 case MSGSND: 315 return compat_sys_msgsnd(first, second, third, 316 compat_ptr(ptr)); 317 case MSGRCV: 318 return compat_sys_msgrcv(first, second, 0, third, 319 0, compat_ptr(ptr)); 320 case MSGGET: 321 return sys_msgget((key_t) first, second); 322 case MSGCTL: 323 return compat_sys_msgctl(first, second, compat_ptr(ptr)); 324 case SHMAT: 325 return compat_sys_shmat(first, second, third, 326 0, compat_ptr(ptr)); 327 case SHMDT: 328 return sys_shmdt(compat_ptr(ptr)); 329 case SHMGET: 330 return sys_shmget(first, (unsigned)second, third); 331 case SHMCTL: 332 return compat_sys_shmctl(first, second, compat_ptr(ptr)); 333 } 334 335 return -ENOSYS; 336} 337#endif 338 339asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low) 340{ 341 if ((int)high < 0) 342 return -EINVAL; 343 else 344 return sys_truncate(path, (high << 32) | low); 345} 346 347asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low) 348{ 349 if ((int)high < 0) 350 return -EINVAL; 351 else 352 return sys_ftruncate(fd, (high << 32) | low); 353} 354 355asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf, 356 size_t count, u32 poshi, u32 poslo) 357{ 358 if ((compat_ssize_t) count < 0) 359 return -EINVAL; 360 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 361} 362 363asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf, 364 size_t count, u32 poshi, u32 poslo) 365{ 366 if ((compat_ssize_t) count < 0) 367 return -EINVAL; 368 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 369} 370 371asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count) 372{ 373 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count); 374} 375 376asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count) 377{ 378 mm_segment_t old_fs = get_fs(); 379 int ret; 380 off_t of; 381 382 if (offset && get_user(of, offset)) 383 return -EFAULT; 384 385 set_fs(KERNEL_DS); 386 ret = sys_sendfile(out_fd, in_fd, 387 offset ? (off_t __force __user *) &of : NULL, count); 388 set_fs(old_fs); 389 390 if (offset && put_user(of, offset)) 391 return -EFAULT; 392 393 return ret; 394} 395 396asmlinkage long sys32_sendfile64(int out_fd, int in_fd, 397 compat_loff_t __user *offset, s32 count) 398{ 399 mm_segment_t old_fs = get_fs(); 400 int ret; 401 loff_t lof; 402 403 if (offset && get_user(lof, offset)) 404 return -EFAULT; 405 406 set_fs(KERNEL_DS); 407 ret = sys_sendfile64(out_fd, in_fd, 408 offset ? (loff_t __force __user *) &lof : NULL, 409 count); 410 set_fs(old_fs); 411 412 if (offset && put_user(lof, offset)) 413 return -EFAULT; 414 415 return ret; 416} 417 418struct stat64_emu31 { 419 unsigned long long st_dev; 420 unsigned int __pad1; 421#define STAT64_HAS_BROKEN_ST_INO 1 422 u32 __st_ino; 423 unsigned int st_mode; 424 unsigned int st_nlink; 425 u32 st_uid; 426 u32 st_gid; 427 unsigned long long st_rdev; 428 unsigned int __pad3; 429 long st_size; 430 u32 st_blksize; 431 unsigned char __pad4[4]; 432 u32 __pad5; /* future possible st_blocks high bits */ 433 u32 st_blocks; /* Number 512-byte blocks allocated. */ 434 u32 st_atime; 435 u32 __pad6; 436 u32 st_mtime; 437 u32 __pad7; 438 u32 st_ctime; 439 u32 __pad8; /* will be high 32 bits of ctime someday */ 440 unsigned long st_ino; 441}; 442 443static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat) 444{ 445 struct stat64_emu31 tmp; 446 447 memset(&tmp, 0, sizeof(tmp)); 448 449 tmp.st_dev = huge_encode_dev(stat->dev); 450 tmp.st_ino = stat->ino; 451 tmp.__st_ino = (u32)stat->ino; 452 tmp.st_mode = stat->mode; 453 tmp.st_nlink = (unsigned int)stat->nlink; 454 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); 455 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); 456 tmp.st_rdev = huge_encode_dev(stat->rdev); 457 tmp.st_size = stat->size; 458 tmp.st_blksize = (u32)stat->blksize; 459 tmp.st_blocks = (u32)stat->blocks; 460 tmp.st_atime = (u32)stat->atime.tv_sec; 461 tmp.st_mtime = (u32)stat->mtime.tv_sec; 462 tmp.st_ctime = (u32)stat->ctime.tv_sec; 463 464 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 465} 466 467asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf) 468{ 469 struct kstat stat; 470 int ret = vfs_stat(filename, &stat); 471 if (!ret) 472 ret = cp_stat64(statbuf, &stat); 473 return ret; 474} 475 476asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf) 477{ 478 struct kstat stat; 479 int ret = vfs_lstat(filename, &stat); 480 if (!ret) 481 ret = cp_stat64(statbuf, &stat); 482 return ret; 483} 484 485asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf) 486{ 487 struct kstat stat; 488 int ret = vfs_fstat(fd, &stat); 489 if (!ret) 490 ret = cp_stat64(statbuf, &stat); 491 return ret; 492} 493 494asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename, 495 struct stat64_emu31 __user* statbuf, int flag) 496{ 497 struct kstat stat; 498 int error; 499 500 error = vfs_fstatat(dfd, filename, &stat, flag); 501 if (error) 502 return error; 503 return cp_stat64(statbuf, &stat); 504} 505 506/* 507 * Linux/i386 didn't use to be able to handle more than 508 * 4 system call parameters, so these system calls used a memory 509 * block for parameter passing.. 510 */ 511 512struct mmap_arg_struct_emu31 { 513 compat_ulong_t addr; 514 compat_ulong_t len; 515 compat_ulong_t prot; 516 compat_ulong_t flags; 517 compat_ulong_t fd; 518 compat_ulong_t offset; 519}; 520 521asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg) 522{ 523 struct mmap_arg_struct_emu31 a; 524 525 if (copy_from_user(&a, arg, sizeof(a))) 526 return -EFAULT; 527 if (a.offset & ~PAGE_MASK) 528 return -EINVAL; 529 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, 530 a.offset >> PAGE_SHIFT); 531} 532 533asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg) 534{ 535 struct mmap_arg_struct_emu31 a; 536 537 if (copy_from_user(&a, arg, sizeof(a))) 538 return -EFAULT; 539 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); 540} 541 542asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count) 543{ 544 if ((compat_ssize_t) count < 0) 545 return -EINVAL; 546 547 return sys_read(fd, buf, count); 548} 549 550asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count) 551{ 552 if ((compat_ssize_t) count < 0) 553 return -EINVAL; 554 555 return sys_write(fd, buf, count); 556} 557 558/* 559 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64. 560 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE} 561 * because the 31 bit values differ from the 64 bit values. 562 */ 563 564asmlinkage long 565sys32_fadvise64(int fd, loff_t offset, size_t len, int advise) 566{ 567 if (advise == 4) 568 advise = POSIX_FADV_DONTNEED; 569 else if (advise == 5) 570 advise = POSIX_FADV_NOREUSE; 571 return sys_fadvise64(fd, offset, len, advise); 572} 573 574struct fadvise64_64_args { 575 int fd; 576 long long offset; 577 long long len; 578 int advice; 579}; 580 581asmlinkage long 582sys32_fadvise64_64(struct fadvise64_64_args __user *args) 583{ 584 struct fadvise64_64_args a; 585 586 if ( copy_from_user(&a, args, sizeof(a)) ) 587 return -EFAULT; 588 if (a.advice == 4) 589 a.advice = POSIX_FADV_DONTNEED; 590 else if (a.advice == 5) 591 a.advice = POSIX_FADV_NOREUSE; 592 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); 593} 594