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 /* For this source file, we want overflow handling. */ 62 63 #undef high2lowuid 64 #undef high2lowgid 65 #undef low2highuid 66 #undef low2highgid 67 #undef SET_UID16 68 #undef SET_GID16 69 #undef NEW_TO_OLD_UID 70 #undef NEW_TO_OLD_GID 71 #undef SET_OLDSTAT_UID 72 #undef SET_OLDSTAT_GID 73 #undef SET_STAT_UID 74 #undef SET_STAT_GID 75 76 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid) 77 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid) 78 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid) 79 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid) 80 #define SET_UID16(var, uid) var = high2lowuid(uid) 81 #define SET_GID16(var, gid) var = high2lowgid(gid) 82 #define NEW_TO_OLD_UID(uid) high2lowuid(uid) 83 #define NEW_TO_OLD_GID(gid) high2lowgid(gid) 84 #define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid) 85 #define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid) 86 #define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid) 87 #define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid) 88 89 COMPAT_SYSCALL_DEFINE3(s390_chown16, const char __user *, filename, 90 u16, user, u16, group) 91 { 92 return sys_chown(filename, low2highuid(user), low2highgid(group)); 93 } 94 95 COMPAT_SYSCALL_DEFINE3(s390_lchown16, const char __user *, 96 filename, u16, user, u16, group) 97 { 98 return sys_lchown(filename, low2highuid(user), low2highgid(group)); 99 } 100 101 COMPAT_SYSCALL_DEFINE3(s390_fchown16, unsigned int, fd, u16, user, u16, group) 102 { 103 return sys_fchown(fd, low2highuid(user), low2highgid(group)); 104 } 105 106 COMPAT_SYSCALL_DEFINE2(s390_setregid16, u16, rgid, u16, egid) 107 { 108 return sys_setregid(low2highgid(rgid), low2highgid(egid)); 109 } 110 111 COMPAT_SYSCALL_DEFINE1(s390_setgid16, u16, gid) 112 { 113 return sys_setgid((gid_t)gid); 114 } 115 116 COMPAT_SYSCALL_DEFINE2(s390_setreuid16, u16, ruid, u16, euid) 117 { 118 return sys_setreuid(low2highuid(ruid), low2highuid(euid)); 119 } 120 121 COMPAT_SYSCALL_DEFINE1(s390_setuid16, u16, uid) 122 { 123 return sys_setuid((uid_t)uid); 124 } 125 126 COMPAT_SYSCALL_DEFINE3(s390_setresuid16, u16, ruid, u16, euid, u16, suid) 127 { 128 return sys_setresuid(low2highuid(ruid), low2highuid(euid), 129 low2highuid(suid)); 130 } 131 132 COMPAT_SYSCALL_DEFINE3(s390_getresuid16, u16 __user *, ruidp, 133 u16 __user *, euidp, u16 __user *, suidp) 134 { 135 const struct cred *cred = current_cred(); 136 int retval; 137 u16 ruid, euid, suid; 138 139 ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid)); 140 euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid)); 141 suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid)); 142 143 if (!(retval = put_user(ruid, ruidp)) && 144 !(retval = put_user(euid, euidp))) 145 retval = put_user(suid, suidp); 146 147 return retval; 148 } 149 150 COMPAT_SYSCALL_DEFINE3(s390_setresgid16, u16, rgid, u16, egid, u16, sgid) 151 { 152 return sys_setresgid(low2highgid(rgid), low2highgid(egid), 153 low2highgid(sgid)); 154 } 155 156 COMPAT_SYSCALL_DEFINE3(s390_getresgid16, u16 __user *, rgidp, 157 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 } 173 174 COMPAT_SYSCALL_DEFINE1(s390_setfsuid16, u16, uid) 175 { 176 return sys_setfsuid((uid_t)uid); 177 } 178 179 COMPAT_SYSCALL_DEFINE1(s390_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 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 } 200 201 static 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 } 221 222 COMPAT_SYSCALL_DEFINE2(s390_getgroups16, int, gidsetsize, u16 __user *, grouplist) 223 { 224 const struct cred *cred = current_cred(); 225 int i; 226 227 if (gidsetsize < 0) 228 return -EINVAL; 229 230 get_group_info(cred->group_info); 231 i = cred->group_info->ngroups; 232 if (gidsetsize) { 233 if (i > gidsetsize) { 234 i = -EINVAL; 235 goto out; 236 } 237 if (groups16_to_user(grouplist, cred->group_info)) { 238 i = -EFAULT; 239 goto out; 240 } 241 } 242 out: 243 put_group_info(cred->group_info); 244 return i; 245 } 246 247 COMPAT_SYSCALL_DEFINE2(s390_setgroups16, int, gidsetsize, u16 __user *, grouplist) 248 { 249 struct group_info *group_info; 250 int retval; 251 252 if (!capable(CAP_SETGID)) 253 return -EPERM; 254 if ((unsigned)gidsetsize > NGROUPS_MAX) 255 return -EINVAL; 256 257 group_info = groups_alloc(gidsetsize); 258 if (!group_info) 259 return -ENOMEM; 260 retval = groups16_from_user(group_info, grouplist); 261 if (retval) { 262 put_group_info(group_info); 263 return retval; 264 } 265 266 retval = set_current_groups(group_info); 267 put_group_info(group_info); 268 269 return retval; 270 } 271 272 COMPAT_SYSCALL_DEFINE0(s390_getuid16) 273 { 274 return high2lowuid(from_kuid_munged(current_user_ns(), current_uid())); 275 } 276 277 COMPAT_SYSCALL_DEFINE0(s390_geteuid16) 278 { 279 return high2lowuid(from_kuid_munged(current_user_ns(), current_euid())); 280 } 281 282 COMPAT_SYSCALL_DEFINE0(s390_getgid16) 283 { 284 return high2lowgid(from_kgid_munged(current_user_ns(), current_gid())); 285 } 286 287 COMPAT_SYSCALL_DEFINE0(s390_getegid16) 288 { 289 return high2lowgid(from_kgid_munged(current_user_ns(), current_egid())); 290 } 291 292 #ifdef CONFIG_SYSVIPC 293 COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second, 294 compat_ulong_t, third, compat_uptr_t, ptr) 295 { 296 if (call >> 16) /* hack for backward compatibility */ 297 return -EINVAL; 298 return compat_sys_ipc(call, first, second, third, ptr, third); 299 } 300 #endif 301 302 COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low) 303 { 304 return sys_truncate(path, (unsigned long)high << 32 | low); 305 } 306 307 COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low) 308 { 309 return sys_ftruncate(fd, (unsigned long)high << 32 | low); 310 } 311 312 COMPAT_SYSCALL_DEFINE5(s390_pread64, unsigned int, fd, char __user *, ubuf, 313 compat_size_t, count, u32, high, u32, low) 314 { 315 if ((compat_ssize_t) count < 0) 316 return -EINVAL; 317 return sys_pread64(fd, ubuf, count, (unsigned long)high << 32 | low); 318 } 319 320 COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubuf, 321 compat_size_t, count, u32, high, u32, low) 322 { 323 if ((compat_ssize_t) count < 0) 324 return -EINVAL; 325 return sys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 | low); 326 } 327 328 COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count) 329 { 330 return sys_readahead(fd, (unsigned long)high << 32 | low, count); 331 } 332 333 struct stat64_emu31 { 334 unsigned long long st_dev; 335 unsigned int __pad1; 336 #define STAT64_HAS_BROKEN_ST_INO 1 337 u32 __st_ino; 338 unsigned int st_mode; 339 unsigned int st_nlink; 340 u32 st_uid; 341 u32 st_gid; 342 unsigned long long st_rdev; 343 unsigned int __pad3; 344 long st_size; 345 u32 st_blksize; 346 unsigned char __pad4[4]; 347 u32 __pad5; /* future possible st_blocks high bits */ 348 u32 st_blocks; /* Number 512-byte blocks allocated. */ 349 u32 st_atime; 350 u32 __pad6; 351 u32 st_mtime; 352 u32 __pad7; 353 u32 st_ctime; 354 u32 __pad8; /* will be high 32 bits of ctime someday */ 355 unsigned long st_ino; 356 }; 357 358 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat) 359 { 360 struct stat64_emu31 tmp; 361 362 memset(&tmp, 0, sizeof(tmp)); 363 364 tmp.st_dev = huge_encode_dev(stat->dev); 365 tmp.st_ino = stat->ino; 366 tmp.__st_ino = (u32)stat->ino; 367 tmp.st_mode = stat->mode; 368 tmp.st_nlink = (unsigned int)stat->nlink; 369 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); 370 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); 371 tmp.st_rdev = huge_encode_dev(stat->rdev); 372 tmp.st_size = stat->size; 373 tmp.st_blksize = (u32)stat->blksize; 374 tmp.st_blocks = (u32)stat->blocks; 375 tmp.st_atime = (u32)stat->atime.tv_sec; 376 tmp.st_mtime = (u32)stat->mtime.tv_sec; 377 tmp.st_ctime = (u32)stat->ctime.tv_sec; 378 379 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 380 } 381 382 COMPAT_SYSCALL_DEFINE2(s390_stat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf) 383 { 384 struct kstat stat; 385 int ret = vfs_stat(filename, &stat); 386 if (!ret) 387 ret = cp_stat64(statbuf, &stat); 388 return ret; 389 } 390 391 COMPAT_SYSCALL_DEFINE2(s390_lstat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf) 392 { 393 struct kstat stat; 394 int ret = vfs_lstat(filename, &stat); 395 if (!ret) 396 ret = cp_stat64(statbuf, &stat); 397 return ret; 398 } 399 400 COMPAT_SYSCALL_DEFINE2(s390_fstat64, unsigned int, fd, struct stat64_emu31 __user *, statbuf) 401 { 402 struct kstat stat; 403 int ret = vfs_fstat(fd, &stat); 404 if (!ret) 405 ret = cp_stat64(statbuf, &stat); 406 return ret; 407 } 408 409 COMPAT_SYSCALL_DEFINE4(s390_fstatat64, unsigned int, dfd, const char __user *, filename, 410 struct stat64_emu31 __user *, statbuf, int, flag) 411 { 412 struct kstat stat; 413 int error; 414 415 error = vfs_fstatat(dfd, filename, &stat, flag); 416 if (error) 417 return error; 418 return cp_stat64(statbuf, &stat); 419 } 420 421 /* 422 * Linux/i386 didn't use to be able to handle more than 423 * 4 system call parameters, so these system calls used a memory 424 * block for parameter passing.. 425 */ 426 427 struct mmap_arg_struct_emu31 { 428 compat_ulong_t addr; 429 compat_ulong_t len; 430 compat_ulong_t prot; 431 compat_ulong_t flags; 432 compat_ulong_t fd; 433 compat_ulong_t offset; 434 }; 435 436 COMPAT_SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct_emu31 __user *, arg) 437 { 438 struct mmap_arg_struct_emu31 a; 439 440 if (copy_from_user(&a, arg, sizeof(a))) 441 return -EFAULT; 442 if (a.offset & ~PAGE_MASK) 443 return -EINVAL; 444 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, 445 a.offset >> PAGE_SHIFT); 446 } 447 448 COMPAT_SYSCALL_DEFINE1(s390_mmap2, struct mmap_arg_struct_emu31 __user *, arg) 449 { 450 struct mmap_arg_struct_emu31 a; 451 452 if (copy_from_user(&a, arg, sizeof(a))) 453 return -EFAULT; 454 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); 455 } 456 457 COMPAT_SYSCALL_DEFINE3(s390_read, unsigned int, fd, char __user *, buf, compat_size_t, count) 458 { 459 if ((compat_ssize_t) count < 0) 460 return -EINVAL; 461 462 return sys_read(fd, buf, count); 463 } 464 465 COMPAT_SYSCALL_DEFINE3(s390_write, unsigned int, fd, const char __user *, buf, compat_size_t, count) 466 { 467 if ((compat_ssize_t) count < 0) 468 return -EINVAL; 469 470 return sys_write(fd, buf, count); 471 } 472 473 /* 474 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64. 475 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE} 476 * because the 31 bit values differ from the 64 bit values. 477 */ 478 479 COMPAT_SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, high, u32, low, compat_size_t, len, int, advise) 480 { 481 if (advise == 4) 482 advise = POSIX_FADV_DONTNEED; 483 else if (advise == 5) 484 advise = POSIX_FADV_NOREUSE; 485 return sys_fadvise64(fd, (unsigned long)high << 32 | low, len, advise); 486 } 487 488 struct fadvise64_64_args { 489 int fd; 490 long long offset; 491 long long len; 492 int advice; 493 }; 494 495 COMPAT_SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args) 496 { 497 struct fadvise64_64_args a; 498 499 if ( copy_from_user(&a, args, sizeof(a)) ) 500 return -EFAULT; 501 if (a.advice == 4) 502 a.advice = POSIX_FADV_DONTNEED; 503 else if (a.advice == 5) 504 a.advice = POSIX_FADV_NOREUSE; 505 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); 506 } 507 508 COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow, 509 u32, nhigh, u32, nlow, unsigned int, flags) 510 { 511 return sys_sync_file_range(fd, ((loff_t)offhigh << 32) + offlow, 512 ((u64)nhigh << 32) + nlow, flags); 513 } 514 515 COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow, 516 u32, lenhigh, u32, lenlow) 517 { 518 return sys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow, 519 ((u64)lenhigh << 32) + lenlow); 520 } 521