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 /* 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, compat_ulong_t, second,
 290                 compat_ulong_t, 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 }