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         int i;
 225
 226         if (gidsetsize < 0)
 227                 return -EINVAL;
 228
 229         get_group_info(current->cred->group_info);
 230         i = current->cred->group_info->ngroups;
 231         if (gidsetsize) {
 232                 if (i > gidsetsize) {
 233                         i = -EINVAL;
 234                         goto out;
 235                 }
 236                 if (groups16_to_user(grouplist, current->cred->group_info)) {
 237                         i = -EFAULT;
 238                         goto out;
 239                 }
 240         }
 241 out:
 242         put_group_info(current->cred->group_info);
 243         return i;
 244 }
 245
 246 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
 247 {
 248         struct group_info *group_info;
 249         int retval;
 250
 251         if (!capable(CAP_SETGID))
 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 asmlinkage long sys32_getuid16(void)
 272 {
 273         return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
 274 }
 275
 276 asmlinkage long sys32_geteuid16(void)
 277 {
 278         return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
 279 }
 280
 281 asmlinkage long sys32_getgid16(void)
 282 {
 283         return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
 284 }
 285
 286 asmlinkage long sys32_getegid16(void)
 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, unsigned long, second,
 293                 unsigned long, 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 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
 302 {
 303         if ((int)high < 0)
 304                 return -EINVAL;
 305         else
 306                 return sys_truncate(path, (high << 32) | low);
 307 }
 308
 309 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
 310 {
 311         if ((int)high < 0)
 312                 return -EINVAL;
 313         else
 314                 return sys_ftruncate(fd, (high << 32) | low);
 315 }
 316
 317 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
 318                                 size_t count, u32 poshi, u32 poslo)
 319 {
 320         if ((compat_ssize_t) count < 0)
 321                 return -EINVAL;
 322         return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
 323 }
 324
 325 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
 326                                 size_t count, u32 poshi, u32 poslo)
 327 {
 328         if ((compat_ssize_t) count < 0)
 329                 return -EINVAL;
 330         return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
 331 }
 332
 333 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
 334 {
 335         return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
 336 }
 337
 338 struct stat64_emu31 {
 339         unsigned long long  st_dev;
 340         unsigned int    __pad1;
 341 #define STAT64_HAS_BROKEN_ST_INO        1
 342         u32             __st_ino;
 343         unsigned int    st_mode;
 344         unsigned int    st_nlink;
 345         u32             st_uid;
 346         u32             st_gid;
 347         unsigned long long  st_rdev;
 348         unsigned int    __pad3;
 349         long            st_size;
 350         u32             st_blksize;
 351         unsigned char   __pad4[4];
 352         u32             __pad5;     /* future possible st_blocks high bits */
 353         u32             st_blocks;  /* Number 512-byte blocks allocated. */
 354         u32             st_atime;
 355         u32             __pad6;
 356         u32             st_mtime;
 357         u32             __pad7;
 358         u32             st_ctime;
 359         u32             __pad8;     /* will be high 32 bits of ctime someday */
 360         unsigned long   st_ino;
 361 };
 362
 363 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
 364 {
 365         struct stat64_emu31 tmp;
 366
 367         memset(&tmp, 0, sizeof(tmp));
 368
 369         tmp.st_dev = huge_encode_dev(stat->dev);
 370         tmp.st_ino = stat->ino;
 371         tmp.__st_ino = (u32)stat->ino;
 372         tmp.st_mode = stat->mode;
 373         tmp.st_nlink = (unsigned int)stat->nlink;
 374         tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
 375         tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
 376         tmp.st_rdev = huge_encode_dev(stat->rdev);
 377         tmp.st_size = stat->size;
 378         tmp.st_blksize = (u32)stat->blksize;
 379         tmp.st_blocks = (u32)stat->blocks;
 380         tmp.st_atime = (u32)stat->atime.tv_sec;
 381         tmp.st_mtime = (u32)stat->mtime.tv_sec;
 382         tmp.st_ctime = (u32)stat->ctime.tv_sec;
 383
 384         return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 385 }
 386
 387 asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
 388 {
 389         struct kstat stat;
 390         int ret = vfs_stat(filename, &stat);
 391         if (!ret)
 392                 ret = cp_stat64(statbuf, &stat);
 393         return ret;
 394 }
 395
 396 asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
 397 {
 398         struct kstat stat;
 399         int ret = vfs_lstat(filename, &stat);
 400         if (!ret)
 401                 ret = cp_stat64(statbuf, &stat);
 402         return ret;
 403 }
 404
 405 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
 406 {
 407         struct kstat stat;
 408         int ret = vfs_fstat(fd, &stat);
 409         if (!ret)
 410                 ret = cp_stat64(statbuf, &stat);
 411         return ret;
 412 }
 413
 414 asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
 415                                 struct stat64_emu31 __user* statbuf, int flag)
 416 {
 417         struct kstat stat;
 418         int error;
 419
 420         error = vfs_fstatat(dfd, filename, &stat, flag);
 421         if (error)
 422                 return error;
 423         return cp_stat64(statbuf, &stat);
 424 }
 425
 426 /*
 427  * Linux/i386 didn't use to be able to handle more than
 428  * 4 system call parameters, so these system calls used a memory
 429  * block for parameter passing..
 430  */
 431
 432 struct mmap_arg_struct_emu31 {
 433         compat_ulong_t addr;
 434         compat_ulong_t len;
 435         compat_ulong_t prot;
 436         compat_ulong_t flags;
 437         compat_ulong_t fd;
 438         compat_ulong_t offset;
 439 };
 440
 441 asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
 442 {
 443         struct mmap_arg_struct_emu31 a;
 444
 445         if (copy_from_user(&a, arg, sizeof(a)))
 446                 return -EFAULT;
 447         if (a.offset & ~PAGE_MASK)
 448                 return -EINVAL;
 449         return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
 450                               a.offset >> PAGE_SHIFT);
 451 }
 452
 453 asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
 454 {
 455         struct mmap_arg_struct_emu31 a;
 456
 457         if (copy_from_user(&a, arg, sizeof(a)))
 458                 return -EFAULT;
 459         return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
 460 }
 461
 462 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
 463 {
 464         if ((compat_ssize_t) count < 0)
 465                 return -EINVAL;
 466
 467         return sys_read(fd, buf, count);
 468 }
 469
 470 asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
 471 {
 472         if ((compat_ssize_t) count < 0)
 473                 return -EINVAL;
 474
 475         return sys_write(fd, buf, count);
 476 }
 477
 478 /*
 479  * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
 480  * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
 481  * because the 31 bit values differ from the 64 bit values.
 482  */
 483
 484 asmlinkage long
 485 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
 486 {
 487         if (advise == 4)
 488                 advise = POSIX_FADV_DONTNEED;
 489         else if (advise == 5)
 490                 advise = POSIX_FADV_NOREUSE;
 491         return sys_fadvise64(fd, offset, len, advise);
 492 }
 493
 494 struct fadvise64_64_args {
 495         int fd;
 496         long long offset;
 497         long long len;
 498         int advice;
 499 };
 500
 501 asmlinkage long
 502 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
 503 {
 504         struct fadvise64_64_args a;
 505
 506         if ( copy_from_user(&a, args, sizeof(a)) )
 507                 return -EFAULT;
 508         if (a.advice == 4)
 509                 a.advice = POSIX_FADV_DONTNEED;
 510         else if (a.advice == 5)
 511                 a.advice = POSIX_FADV_NOREUSE;
 512         return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 513 }