locale/loadlocale.c

   1 /* Functions to read locale data files.
   2    Copyright (C) 1996-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <assert.h>
  21 #include <errno.h>
  22 #include <fcntl.h>
  23 #include <locale.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #ifdef _POSIX_MAPPED_FILES
  28 # include <sys/mman.h>
  29 #endif
  30 #include <sys/stat.h>
  31
  32 #include <not-cancel.h>
  33 #include "localeinfo.h"
  34
  35
  36 static const size_t _nl_category_num_items[] =
  37 {
  38 #define DEFINE_CATEGORY(category, category_name, items, a) \
  39   [category] = _NL_ITEM_INDEX (_NL_NUM_##category),
  40 #include "categories.def"
  41 #undef  DEFINE_CATEGORY
  42 };
  43
  44
  45 #define NO_PAREN(arg, rest...) arg, ##rest
  46
  47 #define DEFINE_CATEGORY(category, category_name, items, a) \
  48 static const enum value_type _nl_value_type_##category[] = { NO_PAREN items };
  49 #define DEFINE_ELEMENT(element, element_name, optstd, type, rest...) \
  50   [_NL_ITEM_INDEX (element)] = type,
  51 #include "categories.def"
  52 #undef DEFINE_CATEGORY
  53
  54 static const enum value_type *const _nl_value_types[] =
  55 {
  56 #define DEFINE_CATEGORY(category, category_name, items, a) \
  57   [category] = _nl_value_type_##category,
  58 #include "categories.def"
  59 #undef DEFINE_CATEGORY
  60 };
  61
  62
  63 struct __locale_data *
  64 internal_function
  65 _nl_intern_locale_data (int category, const void *data, size_t datasize)
  66 {
  67   const struct
  68     {
  69       unsigned int magic;
  70       unsigned int nstrings;
  71       unsigned int strindex[0];
  72     } *const filedata = data;
  73   struct __locale_data *newdata;
  74   size_t cnt;
  75
  76   if (__builtin_expect (datasize < sizeof *filedata, 0)
  77       || __builtin_expect (filedata->magic != LIMAGIC (category), 0))
  78     {
  79       /* Bad data file.  */
  80       __set_errno (EINVAL);
  81       return NULL;
  82     }
  83
  84   if (__builtin_expect (filedata->nstrings < _nl_category_num_items[category],
  85                         0)
  86       || (__builtin_expect (sizeof *filedata
  87                             + filedata->nstrings * sizeof (unsigned int)
  88                             >= datasize, 0)))
  89     {
  90       /* Insufficient data.  */
  91       __set_errno (EINVAL);
  92       return NULL;
  93     }
  94
  95   newdata = malloc (sizeof *newdata
  96                     + filedata->nstrings * sizeof (union locale_data_value));
  97   if (newdata == NULL)
  98     return NULL;
  99
 100   newdata->filedata = (void *) filedata;
 101   newdata->filesize = datasize;
 102   newdata->private.data = NULL;
 103   newdata->private.cleanup = NULL;
 104   newdata->usage_count = 0;
 105   newdata->use_translit = 0;
 106   newdata->nstrings = filedata->nstrings;
 107   for (cnt = 0; cnt < newdata->nstrings; ++cnt)
 108     {
 109       size_t idx = filedata->strindex[cnt];
 110       if (__glibc_unlikely (idx > (size_t) newdata->filesize))
 111         {
 112         puntdata:
 113           free (newdata);
 114           __set_errno (EINVAL);
 115           return NULL;
 116         }
 117
 118       /* Determine the type.  There is one special case: the LC_CTYPE
 119          category can have more elements than there are in the
 120          _nl_value_type_LC_XYZ array.  There are all pointers.  */
 121       switch (category)
 122         {
 123 #define CATTEST(cat) \
 124         case LC_##cat:                                          \
 125           if (cnt >= (sizeof (_nl_value_type_LC_##cat)          \
 126                       / sizeof (_nl_value_type_LC_##cat[0])))   \
 127             goto puntdata;                                      \
 128           break
 129           CATTEST (NUMERIC);
 130           CATTEST (TIME);
 131           CATTEST (COLLATE);
 132           CATTEST (MONETARY);
 133           CATTEST (MESSAGES);
 134           CATTEST (PAPER);
 135           CATTEST (NAME);
 136           CATTEST (ADDRESS);
 137           CATTEST (TELEPHONE);
 138           CATTEST (MEASUREMENT);
 139           CATTEST (IDENTIFICATION);
 140         default:
 141           assert (category == LC_CTYPE);
 142           break;
 143         }
 144
 145       if ((category == LC_CTYPE
 146            && cnt >= (sizeof (_nl_value_type_LC_CTYPE)
 147                       / sizeof (_nl_value_type_LC_CTYPE[0])))
 148           || __builtin_expect (_nl_value_types[category][cnt] != word, 1))
 149         newdata->values[cnt].string = newdata->filedata + idx;
 150       else
 151         {
 152           if (!LOCFILE_ALIGNED_P (idx))
 153             goto puntdata;
 154           newdata->values[cnt].word =
 155             *((const uint32_t *) (newdata->filedata + idx));
 156         }
 157     }
 158
 159   return newdata;
 160 }
 161
 162 void
 163 internal_function
 164 _nl_load_locale (struct loaded_l10nfile *file, int category)
 165 {
 166   int fd;
 167   void *filedata;
 168   struct stat64 st;
 169   struct __locale_data *newdata;
 170   int save_err;
 171   int alloc = ld_mapped;
 172
 173   file->decided = 1;
 174   file->data = NULL;
 175
 176   fd = __open_nocancel (file->filename, O_RDONLY | O_CLOEXEC);
 177   if (__builtin_expect (fd, 0) < 0)
 178     /* Cannot open the file.  */
 179     return;
 180
 181   if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
 182     {
 183     puntfd:
 184       close_not_cancel_no_status (fd);
 185       return;
 186     }
 187   if (__glibc_unlikely (S_ISDIR (st.st_mode)))
 188     {
 189       /* LOCALE/LC_foo is a directory; open LOCALE/LC_foo/SYS_LC_foo
 190            instead.  */
 191       char *newp;
 192       size_t filenamelen;
 193
 194       close_not_cancel_no_status (fd);
 195
 196       filenamelen = strlen (file->filename);
 197       newp = (char *) alloca (filenamelen
 198                               + 5 + _nl_category_name_sizes[category] + 1);
 199       __mempcpy (__mempcpy (__mempcpy (newp, file->filename, filenamelen),
 200                             "/SYS_", 5),
 201                  _nl_category_names.str + _nl_category_name_idxs[category],
 202                  _nl_category_name_sizes[category] + 1);
 203
 204       fd = __open_nocancel (newp, O_RDONLY | O_CLOEXEC);
 205       if (__builtin_expect (fd, 0) < 0)
 206         return;
 207
 208       if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
 209         goto puntfd;
 210     }
 211
 212   /* Map in the file's data.  */
 213   save_err = errno;
 214 #ifdef _POSIX_MAPPED_FILES
 215 # ifndef MAP_COPY
 216   /* Linux seems to lack read-only copy-on-write.  */
 217 #  define MAP_COPY MAP_PRIVATE
 218 # endif
 219 # ifndef MAP_FILE
 220   /* Some systems do not have this flag; it is superfluous.  */
 221 #  define MAP_FILE 0
 222 # endif
 223   filedata = __mmap ((caddr_t) 0, st.st_size,
 224                      PROT_READ, MAP_FILE|MAP_COPY, fd, 0);
 225   if (__glibc_unlikely (filedata == MAP_FAILED))
 226     {
 227       filedata = NULL;
 228       if (__builtin_expect (errno, ENOSYS) == ENOSYS)
 229         {
 230 #endif  /* _POSIX_MAPPED_FILES */
 231           /* No mmap; allocate a buffer and read from the file.  */
 232           alloc = ld_malloced;
 233           filedata = malloc (st.st_size);
 234           if (filedata != NULL)
 235             {
 236               off_t to_read = st.st_size;
 237               ssize_t nread;
 238               char *p = (char *) filedata;
 239               while (to_read > 0)
 240                 {
 241                   nread = __read_nocancel (fd, p, to_read);
 242                   if (__builtin_expect (nread, 1) <= 0)
 243                     {
 244                       free (filedata);
 245                       if (nread == 0)
 246                         __set_errno (EINVAL); /* Bizarreness going on.  */
 247                       goto puntfd;
 248                     }
 249                   p += nread;
 250                   to_read -= nread;
 251                 }
 252               __set_errno (save_err);
 253             }
 254 #ifdef _POSIX_MAPPED_FILES
 255         }
 256     }
 257 #endif  /* _POSIX_MAPPED_FILES */
 258
 259   /* We have mapped the data, so we no longer need the descriptor.  */
 260   close_not_cancel_no_status (fd);
 261
 262   if (__glibc_unlikely (filedata == NULL))
 263     /* We failed to map or read the data.  */
 264     return;
 265
 266   newdata = _nl_intern_locale_data (category, filedata, st.st_size);
 267   if (__glibc_unlikely (newdata == NULL))
 268     /* Bad data.  */
 269     {
 270 #ifdef _POSIX_MAPPED_FILES
 271       if (alloc == ld_mapped)
 272         __munmap ((caddr_t) filedata, st.st_size);
 273 #endif
 274       return;
 275     }
 276
 277   /* _nl_intern_locale_data leaves us these fields to initialize.  */
 278   newdata->name = NULL; /* This will be filled if necessary in findlocale.c. */
 279   newdata->alloc = alloc;
 280
 281   file->data = newdata;
 282 }
 283
 284 void
 285 internal_function
 286 _nl_unload_locale (struct __locale_data *locale)
 287 {
 288   if (locale->private.cleanup)
 289     (*locale->private.cleanup) (locale);
 290
 291   switch (__builtin_expect (locale->alloc, ld_mapped))
 292     {
 293     case ld_malloced:
 294       free ((void *) locale->filedata);
 295       break;
 296     case ld_mapped:
 297 #ifdef _POSIX_MAPPED_FILES
 298       __munmap ((caddr_t) locale->filedata, locale->filesize);
 299       break;
 300 #endif
 301     case ld_archive:            /* Nothing to do.  */
 302       break;
 303     }
 304
 305   if (__builtin_expect (locale->alloc, ld_mapped) != ld_archive)
 306     free ((char *) locale->name);
 307
 308   free (locale);
 309 }