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 *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 } 150 151 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid) 152 { 153 return sys_setresgid(low2highgid(rgid), low2highgid(egid), 154 low2highgid(sgid)); 155 } 156 157 asmlinkage 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 } 173 174 asmlinkage long sys32_setfsuid16(u16 uid) 175 { 176 return sys_setfsuid((uid_t)uid); 177 } 178 179 asmlinkage long sys32_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 asmlinkage long sys32_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 asmlinkage long sys32_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 asmlinkage long sys32_getuid16(void) 273 { 274 return high2lowuid(from_kuid_munged(current_user_ns(), current_uid())); 275 } 276 277 asmlinkage long sys32_geteuid16(void) 278 { 279 return high2lowuid(from_kuid_munged(current_user_ns(), current_euid())); 280 } 281 282 asmlinkage long sys32_getgid16(void) 283 { 284 return high2lowgid(from_kgid_munged(current_user_ns(), current_gid())); 285 } 286 287 asmlinkage long sys32_getegid16(void) 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, unsigned long, second, 294 unsigned long, 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 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low) 303 { 304 if ((int)high < 0) 305 return -EINVAL; 306 else 307 return sys_truncate(path, (high << 32) | low); 308 } 309 310 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low) 311 { 312 if ((int)high < 0) 313 return -EINVAL; 314 else 315 return sys_ftruncate(fd, (high << 32) | low); 316 } 317 318 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf, 319 size_t count, u32 poshi, u32 poslo) 320 { 321 if ((compat_ssize_t) count < 0) 322 return -EINVAL; 323 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 324 } 325 326 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf, 327 size_t count, u32 poshi, u32 poslo) 328 { 329 if ((compat_ssize_t) count < 0) 330 return -EINVAL; 331 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 332 } 333 334 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count) 335 { 336 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count); 337 } 338 339 struct stat64_emu31 { 340 unsigned long long st_dev; 341 unsigned int __pad1; 342 #define STAT64_HAS_BROKEN_ST_INO 1 343 u32 __st_ino; 344 unsigned int st_mode; 345 unsigned int st_nlink; 346 u32 st_uid; 347 u32 st_gid; 348 unsigned long long st_rdev; 349 unsigned int __pad3; 350 long st_size; 351 u32 st_blksize; 352 unsigned char __pad4[4]; 353 u32 __pad5; /* future possible st_blocks high bits */ 354 u32 st_blocks; /* Number 512-byte blocks allocated. */ 355 u32 st_atime; 356 u32 __pad6; 357 u32 st_mtime; 358 u32 __pad7; 359 u32 st_ctime; 360 u32 __pad8; /* will be high 32 bits of ctime someday */ 361 unsigned long st_ino; 362 }; 363 364 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat) 365 { 366 struct stat64_emu31 tmp; 367 368 memset(&tmp, 0, sizeof(tmp)); 369 370 tmp.st_dev = huge_encode_dev(stat->dev); 371 tmp.st_ino = stat->ino; 372 tmp.__st_ino = (u32)stat->ino; 373 tmp.st_mode = stat->mode; 374 tmp.st_nlink = (unsigned int)stat->nlink; 375 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); 376 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); 377 tmp.st_rdev = huge_encode_dev(stat->rdev); 378 tmp.st_size = stat->size; 379 tmp.st_blksize = (u32)stat->blksize; 380 tmp.st_blocks = (u32)stat->blocks; 381 tmp.st_atime = (u32)stat->atime.tv_sec; 382 tmp.st_mtime = (u32)stat->mtime.tv_sec; 383 tmp.st_ctime = (u32)stat->ctime.tv_sec; 384 385 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 386 } 387 388 asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf) 389 { 390 struct kstat stat; 391 int ret = vfs_stat(filename, &stat); 392 if (!ret) 393 ret = cp_stat64(statbuf, &stat); 394 return ret; 395 } 396 397 asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf) 398 { 399 struct kstat stat; 400 int ret = vfs_lstat(filename, &stat); 401 if (!ret) 402 ret = cp_stat64(statbuf, &stat); 403 return ret; 404 } 405 406 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf) 407 { 408 struct kstat stat; 409 int ret = vfs_fstat(fd, &stat); 410 if (!ret) 411 ret = cp_stat64(statbuf, &stat); 412 return ret; 413 } 414 415 asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename, 416 struct stat64_emu31 __user* statbuf, int flag) 417 { 418 struct kstat stat; 419 int error; 420 421 error = vfs_fstatat(dfd, filename, &stat, flag); 422 if (error) 423 return error; 424 return cp_stat64(statbuf, &stat); 425 } 426 427 /* 428 * Linux/i386 didn't use to be able to handle more than 429 * 4 system call parameters, so these system calls used a memory 430 * block for parameter passing.. 431 */ 432 433 struct mmap_arg_struct_emu31 { 434 compat_ulong_t addr; 435 compat_ulong_t len; 436 compat_ulong_t prot; 437 compat_ulong_t flags; 438 compat_ulong_t fd; 439 compat_ulong_t offset; 440 }; 441 442 asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg) 443 { 444 struct mmap_arg_struct_emu31 a; 445 446 if (copy_from_user(&a, arg, sizeof(a))) 447 return -EFAULT; 448 if (a.offset & ~PAGE_MASK) 449 return -EINVAL; 450 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, 451 a.offset >> PAGE_SHIFT); 452 } 453 454 asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg) 455 { 456 struct mmap_arg_struct_emu31 a; 457 458 if (copy_from_user(&a, arg, sizeof(a))) 459 return -EFAULT; 460 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); 461 } 462 463 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count) 464 { 465 if ((compat_ssize_t) count < 0) 466 return -EINVAL; 467 468 return sys_read(fd, buf, count); 469 } 470 471 asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count) 472 { 473 if ((compat_ssize_t) count < 0) 474 return -EINVAL; 475 476 return sys_write(fd, buf, count); 477 } 478 479 /* 480 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64. 481 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE} 482 * because the 31 bit values differ from the 64 bit values. 483 */ 484 485 asmlinkage long 486 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise) 487 { 488 if (advise == 4) 489 advise = POSIX_FADV_DONTNEED; 490 else if (advise == 5) 491 advise = POSIX_FADV_NOREUSE; 492 return sys_fadvise64(fd, offset, len, advise); 493 } 494 495 struct fadvise64_64_args { 496 int fd; 497 long long offset; 498 long long len; 499 int advice; 500 }; 501 502 asmlinkage long 503 sys32_fadvise64_64(struct fadvise64_64_args __user *args) 504 { 505 struct fadvise64_64_args a; 506 507 if ( copy_from_user(&a, args, sizeof(a)) ) 508 return -EFAULT; 509 if (a.advice == 4) 510 a.advice = POSIX_FADV_DONTNEED; 511 else if (a.advice == 5) 512 a.advice = POSIX_FADV_NOREUSE; 513 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); 514 } 515