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/poll.h>
  32 #include <linux/personality.h>
  33 #include <linux/stat.h>
  34 #include <linux/filter.h>
  35 #include <linux/highmem.h>
  36 #include <linux/highuid.h>
  37 #include <linux/mman.h>
  38 #include <linux/ipv6.h>
  39 #include <linux/in.h>
  40 #include <linux/icmpv6.h>
  41 #include <linux/syscalls.h>
  42 #include <linux/sysctl.h>
  43 #include <linux/binfmts.h>
  44 #include <linux/capability.h>
  45 #include <linux/compat.h>
  46 #include <linux/vfs.h>
  47 #include <linux/ptrace.h>
  48 #include <linux/fadvise.h>
  49 #include <linux/ipc.h>
  50 #include <linux/slab.h>
  51
  52 #include <asm/types.h>
  53 #include <linux/uaccess.h>
  54
  55 #include <net/scm.h>
  56 #include <net/sock.h>
  57
  58 #include "compat_linux.h"
  59
  60 /* For this source file, we want overflow handling. */
  61
  62 #undef high2lowuid
  63 #undef high2lowgid
  64 #undef low2highuid
  65 #undef low2highgid
  66 #undef SET_UID16
  67 #undef SET_GID16
  68 #undef NEW_TO_OLD_UID
  69 #undef NEW_TO_OLD_GID
  70 #undef SET_OLDSTAT_UID
  71 #undef SET_OLDSTAT_GID
  72 #undef SET_STAT_UID
  73 #undef SET_STAT_GID
  74
  75 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
  76 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
  77 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
  78 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
  79 #define SET_UID16(var, uid)     var = high2lowuid(uid)
  80 #define SET_GID16(var, gid)     var = high2lowgid(gid)
  81 #define NEW_TO_OLD_UID(uid)     high2lowuid(uid)
  82 #define NEW_TO_OLD_GID(gid)     high2lowgid(gid)
  83 #define SET_OLDSTAT_UID(stat, uid)      (stat).st_uid = high2lowuid(uid)
  84 #define SET_OLDSTAT_GID(stat, gid)      (stat).st_gid = high2lowgid(gid)
  85 #define SET_STAT_UID(stat, uid)         (stat).st_uid = high2lowuid(uid)
  86 #define SET_STAT_GID(stat, gid)         (stat).st_gid = high2lowgid(gid)
  87
  88 COMPAT_SYSCALL_DEFINE3(s390_chown16, const char __user *, filename,
  89                        u16, user, u16, group)
  90 {
  91         return sys_chown(filename, low2highuid(user), low2highgid(group));
  92 }
  93
  94 COMPAT_SYSCALL_DEFINE3(s390_lchown16, const char __user *,
  95                        filename, u16, user, u16, group)
  96 {
  97         return sys_lchown(filename, low2highuid(user), low2highgid(group));
  98 }
  99
 100 COMPAT_SYSCALL_DEFINE3(s390_fchown16, unsigned int, fd, u16, user, u16, group)
 101 {
 102         return sys_fchown(fd, low2highuid(user), low2highgid(group));
 103 }
 104
 105 COMPAT_SYSCALL_DEFINE2(s390_setregid16, u16, rgid, u16, egid)
 106 {
 107         return sys_setregid(low2highgid(rgid), low2highgid(egid));
 108 }
 109
 110 COMPAT_SYSCALL_DEFINE1(s390_setgid16, u16, gid)
 111 {
 112         return sys_setgid((gid_t)gid);
 113 }
 114
 115 COMPAT_SYSCALL_DEFINE2(s390_setreuid16, u16, ruid, u16, euid)
 116 {
 117         return sys_setreuid(low2highuid(ruid), low2highuid(euid));
 118 }
 119
 120 COMPAT_SYSCALL_DEFINE1(s390_setuid16, u16, uid)
 121 {
 122         return sys_setuid((uid_t)uid);
 123 }
 124
 125 COMPAT_SYSCALL_DEFINE3(s390_setresuid16, u16, ruid, u16, euid, u16, suid)
 126 {
 127         return sys_setresuid(low2highuid(ruid), low2highuid(euid),
 128                              low2highuid(suid));
 129 }
 130
 131 COMPAT_SYSCALL_DEFINE3(s390_getresuid16, u16 __user *, ruidp,
 132                        u16 __user *, euidp, u16 __user *, suidp)
 133 {
 134         const struct cred *cred = current_cred();
 135         int retval;
 136         u16 ruid, euid, suid;
 137
 138         ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));
 139         euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));
 140         suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid));
 141
 142         if (!(retval   = put_user(ruid, ruidp)) &&
 143             !(retval   = put_user(euid, euidp)))
 144                 retval = put_user(suid, suidp);
 145
 146         return retval;
 147 }
 148
 149 COMPAT_SYSCALL_DEFINE3(s390_setresgid16, u16, rgid, u16, egid, u16, sgid)
 150 {
 151         return sys_setresgid(low2highgid(rgid), low2highgid(egid),
 152                              low2highgid(sgid));
 153 }
 154
 155 COMPAT_SYSCALL_DEFINE3(s390_getresgid16, u16 __user *, rgidp,
 156                        u16 __user *, egidp, u16 __user *, sgidp)
 157 {
 158         const struct cred *cred = current_cred();
 159         int retval;
 160         u16 rgid, egid, sgid;
 161
 162         rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));
 163         egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));
 164         sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid));
 165
 166         if (!(retval   = put_user(rgid, rgidp)) &&
 167             !(retval   = put_user(egid, egidp)))
 168                 retval = put_user(sgid, sgidp);
 169
 170         return retval;
 171 }
 172
 173 COMPAT_SYSCALL_DEFINE1(s390_setfsuid16, u16, uid)
 174 {
 175         return sys_setfsuid((uid_t)uid);
 176 }
 177
 178 COMPAT_SYSCALL_DEFINE1(s390_setfsgid16, u16, gid)
 179 {
 180         return sys_setfsgid((gid_t)gid);
 181 }
 182
 183 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
 184 {
 185         struct user_namespace *user_ns = current_user_ns();
 186         int i;
 187         u16 group;
 188         kgid_t kgid;
 189
 190         for (i = 0; i < group_info->ngroups; i++) {
 191                 kgid = group_info->gid[i];
 192                 group = (u16)from_kgid_munged(user_ns, kgid);
 193                 if (put_user(group, grouplist+i))
 194                         return -EFAULT;
 195         }
 196
 197         return 0;
 198 }
 199
 200 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
 201 {
 202         struct user_namespace *user_ns = current_user_ns();
 203         int i;
 204         u16 group;
 205         kgid_t kgid;
 206
 207         for (i = 0; i < group_info->ngroups; i++) {
 208                 if (get_user(group, grouplist+i))
 209                         return  -EFAULT;
 210
 211                 kgid = make_kgid(user_ns, (gid_t)group);
 212                 if (!gid_valid(kgid))
 213                         return -EINVAL;
 214
 215                 group_info->gid[i] = kgid;
 216         }
 217
 218         return 0;
 219 }
 220
 221 COMPAT_SYSCALL_DEFINE2(s390_getgroups16, int, gidsetsize, u16 __user *, grouplist)
 222 {
 223         const struct cred *cred = current_cred();
 224         int i;
 225
 226         if (gidsetsize < 0)
 227                 return -EINVAL;
 228
 229         get_group_info(cred->group_info);
 230         i = cred->group_info->ngroups;
 231         if (gidsetsize) {
 232                 if (i > gidsetsize) {
 233                         i = -EINVAL;
 234                         goto out;
 235                 }
 236                 if (groups16_to_user(grouplist, cred->group_info)) {
 237                         i = -EFAULT;
 238                         goto out;
 239                 }
 240         }
 241 out:
 242         put_group_info(cred->group_info);
 243         return i;
 244 }
 245
 246 COMPAT_SYSCALL_DEFINE2(s390_setgroups16, int, gidsetsize, u16 __user *, grouplist)
 247 {
 248         struct group_info *group_info;
 249         int retval;
 250
 251         if (!may_setgroups())
 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 COMPAT_SYSCALL_DEFINE0(s390_getuid16)
 272 {
 273         return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
 274 }
 275
 276 COMPAT_SYSCALL_DEFINE0(s390_geteuid16)
 277 {
 278         return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
 279 }
 280
 281 COMPAT_SYSCALL_DEFINE0(s390_getgid16)
 282 {
 283         return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
 284 }
 285
 286 COMPAT_SYSCALL_DEFINE0(s390_getegid16)
 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, compat_ulong_t, second,
 293                 compat_ulong_t, 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 COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low)
 302 {
 303         return sys_truncate(path, (unsigned long)high << 32 | low);
 304 }
 305
 306 COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low)
 307 {
 308         return sys_ftruncate(fd, (unsigned long)high << 32 | low);
 309 }
 310
 311 COMPAT_SYSCALL_DEFINE5(s390_pread64, unsigned int, fd, char __user *, ubuf,
 312                        compat_size_t, count, u32, high, u32, low)
 313 {
 314         if ((compat_ssize_t) count < 0)
 315                 return -EINVAL;
 316         return sys_pread64(fd, ubuf, count, (unsigned long)high << 32 | low);
 317 }
 318
 319 COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubuf,
 320                        compat_size_t, count, u32, high, u32, low)
 321 {
 322         if ((compat_ssize_t) count < 0)
 323                 return -EINVAL;
 324         return sys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 | low);
 325 }
 326
 327 COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count)
 328 {
 329         return sys_readahead(fd, (unsigned long)high << 32 | low, count);
 330 }
 331
 332 struct stat64_emu31 {
 333         unsigned long long  st_dev;
 334         unsigned int    __pad1;
 335 #define STAT64_HAS_BROKEN_ST_INO        1
 336         u32             __st_ino;
 337         unsigned int    st_mode;
 338         unsigned int    st_nlink;
 339         u32             st_uid;
 340         u32             st_gid;
 341         unsigned long long  st_rdev;
 342         unsigned int    __pad3;
 343         long            st_size;
 344         u32             st_blksize;
 345         unsigned char   __pad4[4];
 346         u32             __pad5;     /* future possible st_blocks high bits */
 347         u32             st_blocks;  /* Number 512-byte blocks allocated. */
 348         u32             st_atime;
 349         u32             __pad6;
 350         u32             st_mtime;
 351         u32             __pad7;
 352         u32             st_ctime;
 353         u32             __pad8;     /* will be high 32 bits of ctime someday */
 354         unsigned long   st_ino;
 355 };
 356
 357 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
 358 {
 359         struct stat64_emu31 tmp;
 360
 361         memset(&tmp, 0, sizeof(tmp));
 362
 363         tmp.st_dev = huge_encode_dev(stat->dev);
 364         tmp.st_ino = stat->ino;
 365         tmp.__st_ino = (u32)stat->ino;
 366         tmp.st_mode = stat->mode;
 367         tmp.st_nlink = (unsigned int)stat->nlink;
 368         tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
 369         tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
 370         tmp.st_rdev = huge_encode_dev(stat->rdev);
 371         tmp.st_size = stat->size;
 372         tmp.st_blksize = (u32)stat->blksize;
 373         tmp.st_blocks = (u32)stat->blocks;
 374         tmp.st_atime = (u32)stat->atime.tv_sec;
 375         tmp.st_mtime = (u32)stat->mtime.tv_sec;
 376         tmp.st_ctime = (u32)stat->ctime.tv_sec;
 377
 378         return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 379 }
 380
 381 COMPAT_SYSCALL_DEFINE2(s390_stat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf)
 382 {
 383         struct kstat stat;
 384         int ret = vfs_stat(filename, &stat);
 385         if (!ret)
 386                 ret = cp_stat64(statbuf, &stat);
 387         return ret;
 388 }
 389
 390 COMPAT_SYSCALL_DEFINE2(s390_lstat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf)
 391 {
 392         struct kstat stat;
 393         int ret = vfs_lstat(filename, &stat);
 394         if (!ret)
 395                 ret = cp_stat64(statbuf, &stat);
 396         return ret;
 397 }
 398
 399 COMPAT_SYSCALL_DEFINE2(s390_fstat64, unsigned int, fd, struct stat64_emu31 __user *, statbuf)
 400 {
 401         struct kstat stat;
 402         int ret = vfs_fstat(fd, &stat);
 403         if (!ret)
 404                 ret = cp_stat64(statbuf, &stat);
 405         return ret;
 406 }
 407
 408 COMPAT_SYSCALL_DEFINE4(s390_fstatat64, unsigned int, dfd, const char __user *, filename,
 409                        struct stat64_emu31 __user *, statbuf, int, flag)
 410 {
 411         struct kstat stat;
 412         int error;
 413
 414         error = vfs_fstatat(dfd, filename, &stat, flag);
 415         if (error)
 416                 return error;
 417         return cp_stat64(statbuf, &stat);
 418 }
 419
 420 /*
 421  * Linux/i386 didn't use to be able to handle more than
 422  * 4 system call parameters, so these system calls used a memory
 423  * block for parameter passing..
 424  */
 425
 426 struct mmap_arg_struct_emu31 {
 427         compat_ulong_t addr;
 428         compat_ulong_t len;
 429         compat_ulong_t prot;
 430         compat_ulong_t flags;
 431         compat_ulong_t fd;
 432         compat_ulong_t offset;
 433 };
 434
 435 COMPAT_SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct_emu31 __user *, arg)
 436 {
 437         struct mmap_arg_struct_emu31 a;
 438
 439         if (copy_from_user(&a, arg, sizeof(a)))
 440                 return -EFAULT;
 441         if (a.offset & ~PAGE_MASK)
 442                 return -EINVAL;
 443         return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
 444                               a.offset >> PAGE_SHIFT);
 445 }
 446
 447 COMPAT_SYSCALL_DEFINE1(s390_mmap2, struct mmap_arg_struct_emu31 __user *, arg)
 448 {
 449         struct mmap_arg_struct_emu31 a;
 450
 451         if (copy_from_user(&a, arg, sizeof(a)))
 452                 return -EFAULT;
 453         return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
 454 }
 455
 456 COMPAT_SYSCALL_DEFINE3(s390_read, unsigned int, fd, char __user *, buf, compat_size_t, count)
 457 {
 458         if ((compat_ssize_t) count < 0)
 459                 return -EINVAL;
 460
 461         return sys_read(fd, buf, count);
 462 }
 463
 464 COMPAT_SYSCALL_DEFINE3(s390_write, unsigned int, fd, const char __user *, buf, compat_size_t, count)
 465 {
 466         if ((compat_ssize_t) count < 0)
 467                 return -EINVAL;
 468
 469         return sys_write(fd, buf, count);
 470 }
 471
 472 /*
 473  * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
 474  * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
 475  * because the 31 bit values differ from the 64 bit values.
 476  */
 477
 478 COMPAT_SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, high, u32, low, compat_size_t, len, int, advise)
 479 {
 480         if (advise == 4)
 481                 advise = POSIX_FADV_DONTNEED;
 482         else if (advise == 5)
 483                 advise = POSIX_FADV_NOREUSE;
 484         return sys_fadvise64(fd, (unsigned long)high << 32 | low, len, advise);
 485 }
 486
 487 struct fadvise64_64_args {
 488         int fd;
 489         long long offset;
 490         long long len;
 491         int advice;
 492 };
 493
 494 COMPAT_SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
 495 {
 496         struct fadvise64_64_args a;
 497
 498         if ( copy_from_user(&a, args, sizeof(a)) )
 499                 return -EFAULT;
 500         if (a.advice == 4)
 501                 a.advice = POSIX_FADV_DONTNEED;
 502         else if (a.advice == 5)
 503                 a.advice = POSIX_FADV_NOREUSE;
 504         return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 505 }
 506
 507 COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow,
 508                        u32, nhigh, u32, nlow, unsigned int, flags)
 509 {
 510         return sys_sync_file_range(fd, ((loff_t)offhigh << 32) + offlow,
 511                                    ((u64)nhigh << 32) + nlow, flags);
 512 }
 513
 514 COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow,
 515                        u32, lenhigh, u32, lenlow)
 516 {
 517         return sys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow,
 518                              ((u64)lenhigh << 32) + lenlow);
 519 }