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 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group) 90 { 91 return sys_chown(filename, low2highuid(user), low2highgid(group)); 92 } 93 94 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group) 95 { 96 return sys_lchown(filename, low2highuid(user), low2highgid(group)); 97 } 98 99 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group) 100 { 101 return sys_fchown(fd, low2highuid(user), low2highgid(group)); 102 } 103 104 asmlinkage long sys32_setregid16(u16 rgid, u16 egid) 105 { 106 return sys_setregid(low2highgid(rgid), low2highgid(egid)); 107 } 108 109 asmlinkage long sys32_setgid16(u16 gid) 110 { 111 return sys_setgid((gid_t)gid); 112 } 113 114 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid) 115 { 116 return sys_setreuid(low2highuid(ruid), low2highuid(euid)); 117 } 118 119 asmlinkage long sys32_setuid16(u16 uid) 120 { 121 return sys_setuid((uid_t)uid); 122 } 123 124 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid) 125 { 126 return sys_setresuid(low2highuid(ruid), low2highuid(euid), 127 low2highuid(suid)); 128 } 129 130 asmlinkage long sys32_getresuid16(u16 __user *ruidp, u16 __user *euidp, u16 __user *suidp) 131 { 132 const struct cred *cred = current_cred(); 133 int retval; 134 u16 ruid, euid, suid; 135 136 ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid)); 137 euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid)); 138 suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid)); 139 140 if (!(retval = put_user(ruid, ruidp)) && 141 !(retval = put_user(euid, euidp))) 142 retval = put_user(suid, suidp); 143 144 return retval; 145 } 146 147 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid) 148 { 149 return sys_setresgid(low2highgid(rgid), low2highgid(egid), 150 low2highgid(sgid)); 151 } 152 153 asmlinkage long sys32_getresgid16(u16 __user *rgidp, u16 __user *egidp, u16 __user *sgidp) 154 { 155 const struct cred *cred = current_cred(); 156 int retval; 157 u16 rgid, egid, sgid; 158 159 rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid)); 160 egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid)); 161 sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid)); 162 163 if (!(retval = put_user(rgid, rgidp)) && 164 !(retval = put_user(egid, egidp))) 165 retval = put_user(sgid, sgidp); 166 167 return retval; 168 } 169 170 asmlinkage long sys32_setfsuid16(u16 uid) 171 { 172 return sys_setfsuid((uid_t)uid); 173 } 174 175 asmlinkage long sys32_setfsgid16(u16 gid) 176 { 177 return sys_setfsgid((gid_t)gid); 178 } 179 180 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info) 181 { 182 struct user_namespace *user_ns = current_user_ns(); 183 int i; 184 u16 group; 185 kgid_t kgid; 186 187 for (i = 0; i < group_info->ngroups; i++) { 188 kgid = GROUP_AT(group_info, i); 189 group = (u16)from_kgid_munged(user_ns, kgid); 190 if (put_user(group, grouplist+i)) 191 return -EFAULT; 192 } 193 194 return 0; 195 } 196 197 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist) 198 { 199 struct user_namespace *user_ns = current_user_ns(); 200 int i; 201 u16 group; 202 kgid_t kgid; 203 204 for (i = 0; i < group_info->ngroups; i++) { 205 if (get_user(group, grouplist+i)) 206 return -EFAULT; 207 208 kgid = make_kgid(user_ns, (gid_t)group); 209 if (!gid_valid(kgid)) 210 return -EINVAL; 211 212 GROUP_AT(group_info, i) = kgid; 213 } 214 215 return 0; 216 } 217 218 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist) 219 { 220 const struct cred *cred = current_cred(); 221 int i; 222 223 if (gidsetsize < 0) 224 return -EINVAL; 225 226 get_group_info(cred->group_info); 227 i = cred->group_info->ngroups; 228 if (gidsetsize) { 229 if (i > gidsetsize) { 230 i = -EINVAL; 231 goto out; 232 } 233 if (groups16_to_user(grouplist, cred->group_info)) { 234 i = -EFAULT; 235 goto out; 236 } 237 } 238 out: 239 put_group_info(cred->group_info); 240 return i; 241 } 242 243 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist) 244 { 245 struct group_info *group_info; 246 int retval; 247 248 if (!capable(CAP_SETGID)) 249 return -EPERM; 250 if ((unsigned)gidsetsize > NGROUPS_MAX) 251 return -EINVAL; 252 253 group_info = groups_alloc(gidsetsize); 254 if (!group_info) 255 return -ENOMEM; 256 retval = groups16_from_user(group_info, grouplist); 257 if (retval) { 258 put_group_info(group_info); 259 return retval; 260 } 261 262 retval = set_current_groups(group_info); 263 put_group_info(group_info); 264 265 return retval; 266 } 267 268 asmlinkage long sys32_getuid16(void) 269 { 270 return high2lowuid(from_kuid_munged(current_user_ns(), current_uid())); 271 } 272 273 asmlinkage long sys32_geteuid16(void) 274 { 275 return high2lowuid(from_kuid_munged(current_user_ns(), current_euid())); 276 } 277 278 asmlinkage long sys32_getgid16(void) 279 { 280 return high2lowgid(from_kgid_munged(current_user_ns(), current_gid())); 281 } 282 283 asmlinkage long sys32_getegid16(void) 284 { 285 return high2lowgid(from_kgid_munged(current_user_ns(), current_egid())); 286 } 287 288 #ifdef CONFIG_SYSVIPC 289 COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, unsigned long, second, 290 unsigned long, third, compat_uptr_t, ptr) 291 { 292 if (call >> 16) /* hack for backward compatibility */ 293 return -EINVAL; 294 return compat_sys_ipc(call, first, second, third, ptr, third); 295 } 296 #endif 297 298 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low) 299 { 300 if ((int)high < 0) 301 return -EINVAL; 302 else 303 return sys_truncate(path, (high << 32) | low); 304 } 305 306 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low) 307 { 308 if ((int)high < 0) 309 return -EINVAL; 310 else 311 return sys_ftruncate(fd, (high << 32) | low); 312 } 313 314 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf, 315 size_t count, u32 poshi, u32 poslo) 316 { 317 if ((compat_ssize_t) count < 0) 318 return -EINVAL; 319 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 320 } 321 322 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf, 323 size_t count, u32 poshi, u32 poslo) 324 { 325 if ((compat_ssize_t) count < 0) 326 return -EINVAL; 327 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo)); 328 } 329 330 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count) 331 { 332 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count); 333 } 334 335 struct stat64_emu31 { 336 unsigned long long st_dev; 337 unsigned int __pad1; 338 #define STAT64_HAS_BROKEN_ST_INO 1 339 u32 __st_ino; 340 unsigned int st_mode; 341 unsigned int st_nlink; 342 u32 st_uid; 343 u32 st_gid; 344 unsigned long long st_rdev; 345 unsigned int __pad3; 346 long st_size; 347 u32 st_blksize; 348 unsigned char __pad4[4]; 349 u32 __pad5; /* future possible st_blocks high bits */ 350 u32 st_blocks; /* Number 512-byte blocks allocated. */ 351 u32 st_atime; 352 u32 __pad6; 353 u32 st_mtime; 354 u32 __pad7; 355 u32 st_ctime; 356 u32 __pad8; /* will be high 32 bits of ctime someday */ 357 unsigned long st_ino; 358 }; 359 360 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat) 361 { 362 struct stat64_emu31 tmp; 363 364 memset(&tmp, 0, sizeof(tmp)); 365 366 tmp.st_dev = huge_encode_dev(stat->dev); 367 tmp.st_ino = stat->ino; 368 tmp.__st_ino = (u32)stat->ino; 369 tmp.st_mode = stat->mode; 370 tmp.st_nlink = (unsigned int)stat->nlink; 371 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid); 372 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid); 373 tmp.st_rdev = huge_encode_dev(stat->rdev); 374 tmp.st_size = stat->size; 375 tmp.st_blksize = (u32)stat->blksize; 376 tmp.st_blocks = (u32)stat->blocks; 377 tmp.st_atime = (u32)stat->atime.tv_sec; 378 tmp.st_mtime = (u32)stat->mtime.tv_sec; 379 tmp.st_ctime = (u32)stat->ctime.tv_sec; 380 381 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 382 } 383 384 asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf) 385 { 386 struct kstat stat; 387 int ret = vfs_stat(filename, &stat); 388 if (!ret) 389 ret = cp_stat64(statbuf, &stat); 390 return ret; 391 } 392 393 asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf) 394 { 395 struct kstat stat; 396 int ret = vfs_lstat(filename, &stat); 397 if (!ret) 398 ret = cp_stat64(statbuf, &stat); 399 return ret; 400 } 401 402 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf) 403 { 404 struct kstat stat; 405 int ret = vfs_fstat(fd, &stat); 406 if (!ret) 407 ret = cp_stat64(statbuf, &stat); 408 return ret; 409 } 410 411 asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename, 412 struct stat64_emu31 __user* statbuf, int flag) 413 { 414 struct kstat stat; 415 int error; 416 417 error = vfs_fstatat(dfd, filename, &stat, flag); 418 if (error) 419 return error; 420 return cp_stat64(statbuf, &stat); 421 } 422 423 /* 424 * Linux/i386 didn't use to be able to handle more than 425 * 4 system call parameters, so these system calls used a memory 426 * block for parameter passing.. 427 */ 428 429 struct mmap_arg_struct_emu31 { 430 compat_ulong_t addr; 431 compat_ulong_t len; 432 compat_ulong_t prot; 433 compat_ulong_t flags; 434 compat_ulong_t fd; 435 compat_ulong_t offset; 436 }; 437 438 asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg) 439 { 440 struct mmap_arg_struct_emu31 a; 441 442 if (copy_from_user(&a, arg, sizeof(a))) 443 return -EFAULT; 444 if (a.offset & ~PAGE_MASK) 445 return -EINVAL; 446 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, 447 a.offset >> PAGE_SHIFT); 448 } 449 450 asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg) 451 { 452 struct mmap_arg_struct_emu31 a; 453 454 if (copy_from_user(&a, arg, sizeof(a))) 455 return -EFAULT; 456 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); 457 } 458 459 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count) 460 { 461 if ((compat_ssize_t) count < 0) 462 return -EINVAL; 463 464 return sys_read(fd, buf, count); 465 } 466 467 asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count) 468 { 469 if ((compat_ssize_t) count < 0) 470 return -EINVAL; 471 472 return sys_write(fd, buf, count); 473 } 474 475 /* 476 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64. 477 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE} 478 * because the 31 bit values differ from the 64 bit values. 479 */ 480 481 asmlinkage long 482 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise) 483 { 484 if (advise == 4) 485 advise = POSIX_FADV_DONTNEED; 486 else if (advise == 5) 487 advise = POSIX_FADV_NOREUSE; 488 return sys_fadvise64(fd, offset, len, advise); 489 } 490 491 struct fadvise64_64_args { 492 int fd; 493 long long offset; 494 long long len; 495 int advice; 496 }; 497 498 asmlinkage long 499 sys32_fadvise64_64(struct fadvise64_64_args __user *args) 500 { 501 struct fadvise64_64_args a; 502 503 if ( copy_from_user(&a, args, sizeof(a)) ) 504 return -EFAULT; 505 if (a.advice == 4) 506 a.advice = POSIX_FADV_DONTNEED; 507 else if (a.advice == 5) 508 a.advice = POSIX_FADV_NOREUSE; 509 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice); 510 } 511