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/poll.h> 32 #include <linux/personality.h> 33 #include <linux/stat.h> 34 #include <linux/filter.h> 35 #include <linux/highmem.h> 36 #include <linux/highuid.h> 37 #include <linux/mman.h> 38 #include <linux/ipv6.h> 39 #include <linux/in.h> 40 #include <linux/icmpv6.h> 41 #include <linux/syscalls.h> 42 #include <linux/sysctl.h> 43 #include <linux/binfmts.h> 44 #include <linux/capability.h> 45 #include <linux/compat.h> 46 #include <linux/vfs.h> 47 #include <linux/ptrace.h> 48 #include <linux/fadvise.h> 49 #include <linux/ipc.h> 50 #include <linux/slab.h> 51 52 #include <asm/types.h> 53 #include <linux/uaccess.h> 54 55 #include <net/scm.h> 56 #include <net/sock.h> 57 58 #include "compat_linux.h" 59 60 /* For this source file, we want overflow handling. */ 61 62 #undef high2lowuid 63 #undef high2lowgid 64 #undef low2highuid 65 #undef low2highgid 66 #undef SET_UID16 67 #undef SET_GID16 68 #undef NEW_TO_OLD_UID 69 #undef NEW_TO_OLD_GID 70 #undef SET_OLDSTAT_UID 71 #undef SET_OLDSTAT_GID 72 #undef SET_STAT_UID 73 #undef SET_STAT_GID 74 75 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid) 76 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid) 77 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid) 78 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid) 79 #define SET_UID16(var, uid) var = high2lowuid(uid) 80 #define SET_GID16(var, gid) var = high2lowgid(gid) 81 #define NEW_TO_OLD_UID(uid) high2lowuid(uid) 82 #define NEW_TO_OLD_GID(gid) high2lowgid(gid) 83 #define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid) 84 #define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid) 85 #define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid) 86 #define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid) 87 88 COMPAT_SYSCALL_DEFINE3(s390_chown16, const char __user *, filename, 89 u16, user, u16, group) 90 { 91 return sys_chown(filename, low2highuid(user), low2highgid(group)); 92 } 93 94 COMPAT_SYSCALL_DEFINE3(s390_lchown16, const char __user *, 95 filename, u16, user, u16, group) 96 { 97 return sys_lchown(filename, low2highuid(user), low2highgid(group)); 98 } 99 100 COMPAT_SYSCALL_DEFINE3(s390_fchown16, unsigned int, fd, u16, user, u16, group) 101 { 102 return sys_fchown(fd, low2highuid(user), low2highgid(group)); 103 } 104 105 COMPAT_SYSCALL_DEFINE2(s390_setregid16, u16, rgid, u16, egid) 106 { 107 return sys_setregid(low2highgid(rgid), low2highgid(egid)); 108 } 109 110 COMPAT_SYSCALL_DEFINE1(s390_setgid16, u16, gid) 111 { 112 return sys_setgid((gid_t)gid); 113 } 114 115 COMPAT_SYSCALL_DEFINE2(s390_setreuid16, u16, ruid, u16, euid) 116 { 117 return sys_setreuid(low2highuid(ruid), low2highuid(euid)); 118 } 119 120 COMPAT_SYSCALL_DEFINE1(s390_setuid16, u16, uid) 121 { 122 return sys_setuid((uid_t)uid); 123 } 124 125 COMPAT_SYSCALL_DEFINE3(s390_setresuid16, u16, ruid, u16, euid, u16, suid) 126 { 127 return sys_setresuid(low2highuid(ruid), low2highuid(euid), 128 low2highuid(suid)); 129 } 130 131 COMPAT_SYSCALL_DEFINE3(s390_getresuid16, u16 __user *, ruidp, 132 u16 __user *, euidp, u16 __user *, suidp) 133 { 134 const struct cred *cred = current_cred(); 135 int retval; 136 u16 ruid, euid, suid; 137 138 ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid)); 139 euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid)); 140 suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid)); 141 142 if (!(retval = put_user(ruid, ruidp)) && 143 !(retval = put_user(euid, euidp))) 144 retval = put_user(suid, suidp); 145 146 return retval; 147 } 148 149 COMPAT_SYSCALL_DEFINE3(s390_setresgid16, u16, rgid, u16, egid, u16, sgid) 150 { 151 return sys_setresgid(low2highgid(rgid), low2highgid(egid), 152 low2highgid(sgid)); 153 } 154 155 COMPAT_SYSCALL_DEFINE3(s390_getresgid16, u16 __user *, rgidp, 156 u16 __user *, egidp, u16 __user *, sgidp) 157 { 158 const struct cred *cred = current_cred(); 159 int retval; 160 u16 rgid, egid, sgid; 161 162 rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid)); 163 egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid)); 164 sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid)); 165 166 if (!(retval = put_user(rgid, rgidp)) && 167 !(retval = put_user(egid, egidp))) 168 retval = put_user(sgid, sgidp); 169 170 return retval; 171 } 172 173 COMPAT_SYSCALL_DEFINE1(s390_setfsuid16, u16, uid) 174 { 175 return sys_setfsuid((uid_t)uid); 176 } 177 178 COMPAT_SYSCALL_DEFINE1(s390_setfsgid16, u16, gid) 179 { 180 return sys_setfsgid((gid_t)gid); 181 } 182 183 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info) 184 { 185 struct user_namespace *user_ns = current_user_ns(); 186 int i; 187 u16 group; 188 kgid_t kgid; 189 190 for (i = 0; i < group_info->ngroups; i++) { 191 kgid = group_info->gid[i]; 192 group = (u16)from_kgid_munged(user_ns, kgid); 193 if (put_user(group, grouplist+i)) 194 return -EFAULT; 195 } 196 197 return 0; 198 } 199 200 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist) 201 { 202 struct user_namespace *user_ns = current_user_ns(); 203 int i; 204 u16 group; 205 kgid_t kgid; 206 207 for (i = 0; i < group_info->ngroups; i++) { 208 if (get_user(group, grouplist+i)) 209 return -EFAULT; 210 211 kgid = make_kgid(user_ns, (gid_t)group); 212 if (!gid_valid(kgid)) 213 return -EINVAL; 214 215 group_info->gid[i] = kgid; 216 } 217 218 return 0; 219 } 220 221 COMPAT_SYSCALL_DEFINE2(s390_getgroups16, int, gidsetsize, u16 __user *, grouplist) 222 { 223 const struct cred *cred = current_cred(); 224 int i; 225 226 if (gidsetsize < 0) 227 return -EINVAL; 228 229 get_group_info(cred->group_info); 230 i = cred->group_info->ngroups; 231 if (gidsetsize) { 232 if (i > gidsetsize) { 233 i = -EINVAL; 234 goto out; 235 } 236 if (groups16_to_user(grouplist, cred->group_info)) { 237 i = -EFAULT; 238 goto out; 239 } 240 } 241 out: 242 put_group_info(cred->group_info); 243 return i; 244 } 245 246 COMPAT_SYSCALL_DEFINE2(s390_setgroups16, int, gidsetsize, u16 __user *, grouplist) 247 { 248 struct group_info *group_info; 249 int retval; 250 251 if (!may_setgroups()) 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 } 270 271 COMPAT_SYSCALL_DEFINE0(s390_getuid16) 272 { 273 return high2lowuid(from_kuid_munged(current_user_ns(), current_uid())); 274 } 275 276 COMPAT_SYSCALL_DEFINE0(s390_geteuid16) 277 { 278 return high2lowuid(from_kuid_munged(current_user_ns(), current_euid())); 279 } 280 281 COMPAT_SYSCALL_DEFINE0(s390_getgid16) 282 { 283 return high2lowgid(from_kgid_munged(current_user_ns(), current_gid())); 284 } 285 286 COMPAT_SYSCALL_DEFINE0(s390_getegid16) 287 { 288 return high2lowgid(from_kgid_munged(current_user_ns(), current_egid())); 289 } 290 291 #ifdef CONFIG_SYSVIPC 292 COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second, 293 compat_ulong_t, third, compat_uptr_t, ptr) 294 { 295 if (call >> 16) /* hack for backward compatibility */ 296 return -EINVAL; 297 return compat_sys_ipc(call, first, second, third, ptr, third); 298 } 299 #endif 300 301 COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low) 302 { 303 return sys_truncate(path, (unsigned long)high << 32 | low); 304 } 305 306 COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low) 307 { 308 return sys_ftruncate(fd, (unsigned long)high << 32 | low); 309 } 310 311 COMPAT_SYSCALL_DEFINE5(s390_pread64, unsigned int, fd, char __user *, ubuf, 312 compat_size_t, count, u32, high, u32, low) 313 { 314 if ((compat_ssize_t) count < 0) 315 return -EINVAL; 316 return sys_pread64(fd, ubuf, count, (unsigned long)high << 32 | low); 317 } 318 319 COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubuf, 320 compat_size_t, count, u32, high, u32, low) 321 { 322 if ((compat_ssize_t) count < 0) 323 return -EINVAL; 324 return sys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 | low); 325 } 326 327 COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count) 328 { 329 return sys_readahead(fd, (unsigned long)high << 32 | low, count); 330 } 331 332 struct stat64_emu31 { 333 unsigned long long st_dev; 334 unsigned int __pad1; 335 #define STAT64_HAS_BROKEN_ST_INO 1 336 u32 __st_ino; 337 unsigned int st_mode; 338 unsigned int st_nlink; 339 u32 st_uid; 340 u32 st_gid; 341 unsigned long long st_rdev; 342 unsigned int __pad3; 343 long st_size; 344 u32 st_blksize; 345 unsigned char __pad4[4]; 346 u32 __pad5; /* future possible st_blocks high bits */ 347 u32 st_blocks; /* Number 512-byte blocks allocated. */ 348 u32 st_atime; 349 u32 __pad6; 350 u32 st_mtime; 351 u32 __pad7; 352 u32 st_ctime; 353 u32 __pad8; /* will be high 32 bits of ctime someday */ 354 unsigned long st_ino; 355 }; 356 357 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat) 358 { 359 struct stat64_emu31 tmp; 360 361 memset(&tmp, 0, sizeof(tmp)); 362 363 tmp.st_dev = huge_encode_dev(stat->dev); 364 tmp.st_ino = stat->ino; 365 tmp.__st_ino = (u32)stat->ino; 366 tmp.st_mode = stat->mode; 367 tmp.st_nlink = (unsigned int)stat->nlink; 368 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); 369 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); 370 tmp.st_rdev = huge_encode_dev(stat->rdev); 371 tmp.st_size = stat->size; 372 tmp.st_blksize = (u32)stat->blksize; 373 tmp.st_blocks = (u32)stat->blocks; 374 tmp.st_atime = (u32)stat->atime.tv_sec; 375 tmp.st_mtime = (u32)stat->mtime.tv_sec; 376 tmp.st_ctime = (u32)stat->ctime.tv_sec; 377 378 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 379 } 380 381 COMPAT_SYSCALL_DEFINE2(s390_stat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf) 382 { 383 struct kstat stat; 384 int ret = vfs_stat(filename, &stat); 385 if (!ret) 386 ret = cp_stat64(statbuf, &stat); 387 return ret; 388 } 389 390 COMPAT_SYSCALL_DEFINE2(s390_lstat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf) 391 { 392 struct kstat stat; 393 int ret = vfs_lstat(filename, &stat); 394 if (!ret) 395 ret = cp_stat64(statbuf, &stat); 396 return ret; 397 } 398 399 COMPAT_SYSCALL_DEFINE2(s390_fstat64, unsigned int, fd, struct stat64_emu31 __user *, statbuf) 400 { 401 struct kstat stat; 402 int ret = vfs_fstat(fd, &stat); 403 if (!ret) 404 ret = cp_stat64(statbuf, &stat); 405 return ret; 406 } 407 408 COMPAT_SYSCALL_DEFINE4(s390_fstatat64, unsigned int, dfd, const char __user *, filename, 409 struct stat64_emu31 __user *, statbuf, int, flag) 410 { 411 struct kstat stat; 412 int error; 413 414 error = vfs_fstatat(dfd, filename, &stat, flag); 415 if (error) 416 return error; 417 return cp_stat64(statbuf, &stat); 418 } 419 420 /* 421 * Linux/i386 didn't use to be able to handle more than 422 * 4 system call parameters, so these system calls used a memory 423 * block for parameter passing.. 424 */ 425 426 struct mmap_arg_struct_emu31 { 427 compat_ulong_t addr; 428 compat_ulong_t len; 429 compat_ulong_t prot; 430 compat_ulong_t flags; 431 compat_ulong_t fd; 432 compat_ulong_t offset; 433 }; 434 435 COMPAT_SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct_emu31 __user *, arg) 436 { 437 struct mmap_arg_struct_emu31 a; 438 439 if (copy_from_user(&a, arg, sizeof(a))) 440 return -EFAULT; 441 if (a.offset & ~PAGE_MASK) 442 return -EINVAL; 443 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, 444 a.offset >> PAGE_SHIFT); 445 } 446 447 COMPAT_SYSCALL_DEFINE1(s390_mmap2, struct mmap_arg_struct_emu31 __user *, arg) 448 { 449 struct mmap_arg_struct_emu31 a; 450 451 if (copy_from_user(&a, arg, sizeof(a))) 452 return -EFAULT; 453 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); 454 } 455 456 COMPAT_SYSCALL_DEFINE3(s390_read, unsigned int, fd, char __user *, buf, compat_size_t, count) 457 { 458 if ((compat_ssize_t) count < 0) 459 return -EINVAL; 460 461 return sys_read(fd, buf, count); 462 } 463 464 COMPAT_SYSCALL_DEFINE3(s390_write, unsigned int, fd, const char __user *, buf, compat_size_t, count) 465 { 466 if ((compat_ssize_t) count < 0) 467 return -EINVAL; 468 469 return sys_write(fd, buf, count); 470 } 471 472 /* 473 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64. 474 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE} 475 * because the 31 bit values differ from the 64 bit values. 476 */ 477 478 COMPAT_SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, high, u32, low, compat_size_t, len, int, advise) 479 { 480 if (advise == 4) 481 advise = POSIX_FADV_DONTNEED; 482 else if (advise == 5) 483 advise = POSIX_FADV_NOREUSE; 484 return sys_fadvise64(fd, (unsigned long)high << 32 | low, len, advise); 485 } 486 487 struct fadvise64_64_args { 488 int fd; 489 long long offset; 490 long long len; 491 int advice; 492 }; 493 494 COMPAT_SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args) 495 { 496 struct fadvise64_64_args a; 497 498 if ( copy_from_user(&a, args, sizeof(a)) ) 499 return -EFAULT; 500 if (a.advice == 4) 501 a.advice = POSIX_FADV_DONTNEED; 502 else if (a.advice == 5) 503 a.advice = POSIX_FADV_NOREUSE; 504 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); 505 } 506 507 COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow, 508 u32, nhigh, u32, nlow, unsigned int, flags) 509 { 510 return sys_sync_file_range(fd, ((loff_t)offhigh << 32) + offlow, 511 ((u64)nhigh << 32) + nlow, flags); 512 } 513 514 COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow, 515 u32, lenhigh, u32, lenlow) 516 { 517 return sys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow, 518 ((u64)lenhigh << 32) + lenlow); 519 } 520