arch/s390/kernel/compat_linux.c

   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 (!may_setgroups())
 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 }