server/mapping.c

   1 /*
   2  * Server-side file mapping management
   3  *
   4  * Copyright (C) 1999 Alexandre Julliard
   5  *
   6  * This 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  * This 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 this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <stdarg.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <sys/stat.h>
  29 #include <unistd.h>
  30
  31 #include "ntstatus.h"
  32 #define WIN32_NO_STATUS
  33 #include "windef.h"
  34 #include "winternl.h"
  35
  36 #include "file.h"
  37 #include "handle.h"
  38 #include "thread.h"
  39 #include "request.h"
  40
  41 struct mapping
  42 {
  43     struct object   obj;             /* object header */
  44     file_pos_t      size;            /* mapping size */
  45     int             protect;         /* protection flags */
  46     struct file    *file;            /* file mapped */
  47     int             header_size;     /* size of headers (for PE image mapping) */
  48     void           *base;            /* default base addr (for PE image mapping) */
  49     struct file    *shared_file;     /* temp file for shared PE mapping */
  50     int             shared_size;     /* shared mapping total size */
  51     struct list     shared_entry;    /* entry in global shared PE mappings list */
  52 };
  53
  54 static void mapping_dump( struct object *obj, int verbose );
  55 static struct fd *mapping_get_fd( struct object *obj );
  56 static void mapping_destroy( struct object *obj );
  57
  58 static const struct object_ops mapping_ops =
  59 {
  60     sizeof(struct mapping),      /* size */
  61     mapping_dump,                /* dump */
  62     no_add_queue,                /* add_queue */
  63     NULL,                        /* remove_queue */
  64     NULL,                        /* signaled */
  65     NULL,                        /* satisfied */
  66     no_signal,                   /* signal */
  67     mapping_get_fd,              /* get_fd */
  68     no_lookup_name,              /* lookup_name */
  69     no_close_handle,             /* close_handle */
  70     mapping_destroy              /* destroy */
  71 };
  72
  73 static struct list shared_list = LIST_INIT(shared_list);
  74
  75 #ifdef __i386__
  76
  77 /* These are always the same on an i386, and it will be faster this way */
  78 # define page_mask  0xfff
  79 # define page_shift 12
  80 # define init_page_size() do { /* nothing */ } while(0)
  81
  82 #else  /* __i386__ */
  83
  84 static int page_shift, page_mask;
  85
  86 static void init_page_size(void)
  87 {
  88     int page_size;
  89 # ifdef HAVE_GETPAGESIZE
  90     page_size = getpagesize();
  91 # else
  92 #  ifdef __svr4__
  93     page_size = sysconf(_SC_PAGESIZE);
  94 #  else
  95 #   error Cannot get the page size on this platform
  96 #  endif
  97 # endif
  98     page_mask = page_size - 1;
  99     /* Make sure we have a power of 2 */
 100     assert( !(page_size & page_mask) );
 101     page_shift = 0;
 102     while ((1 << page_shift) != page_size) page_shift++;
 103 }
 104 #endif  /* __i386__ */
 105
 106 #define ROUND_SIZE_MASK(addr,size,mask) \
 107    (((int)(size) + ((int)(addr) & (mask)) + (mask)) & ~(mask))
 108
 109 #define ROUND_SIZE(size)  (((size) + page_mask) & ~page_mask)
 110
 111
 112 /* find the shared PE mapping for a given mapping */
 113 static struct file *get_shared_file( struct mapping *mapping )
 114 {
 115     struct mapping *ptr;
 116
 117     LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
 118         if (is_same_file( ptr->file, mapping->file ))
 119             return (struct file *)grab_object( ptr->shared_file );
 120     return NULL;
 121 }
 122
 123 /* return the size of the memory mapping of a given section */
 124 static inline unsigned int get_section_map_size( const IMAGE_SECTION_HEADER *sec )
 125 {
 126     if (!sec->Misc.VirtualSize) return ROUND_SIZE( sec->SizeOfRawData );
 127     else return ROUND_SIZE( sec->Misc.VirtualSize );
 128 }
 129
 130 /* return the size of the file mapping of a given section */
 131 static inline unsigned int get_section_filemap_size( const IMAGE_SECTION_HEADER *sec )
 132 {
 133     if (!sec->Misc.VirtualSize) return sec->SizeOfRawData;
 134     else return min( sec->SizeOfRawData, ROUND_SIZE( sec->Misc.VirtualSize ) );
 135 }
 136
 137 /* allocate and fill the temp file for a shared PE image mapping */
 138 static int build_shared_mapping( struct mapping *mapping, int fd,
 139                                  IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
 140 {
 141     unsigned int i, size, max_size, total_size;
 142     off_t shared_pos, read_pos, write_pos;
 143     char *buffer = NULL;
 144     int shared_fd;
 145     long toread;
 146
 147     /* compute the total size of the shared mapping */
 148
 149     total_size = max_size = 0;
 150     for (i = 0; i < nb_sec; i++)
 151     {
 152         if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
 153             (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
 154         {
 155             size = get_section_filemap_size( &sec[i] );
 156             if (size > max_size) max_size = size;
 157             total_size += get_section_map_size( &sec[i] );
 158         }
 159     }
 160     if (!(mapping->shared_size = total_size)) return 1;  /* nothing to do */
 161
 162     if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
 163
 164     /* create a temp file for the mapping */
 165
 166     if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
 167     if (!grow_file( mapping->shared_file, total_size )) goto error;
 168     if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
 169
 170     if (!(buffer = malloc( max_size ))) goto error;
 171
 172     /* copy the shared sections data into the temp file */
 173
 174     shared_pos = 0;
 175     for (i = 0; i < nb_sec; i++)
 176     {
 177         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
 178         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
 179         write_pos = shared_pos;
 180         shared_pos += get_section_map_size( &sec[i] );
 181         read_pos = sec[i].PointerToRawData;
 182         size = get_section_filemap_size( &sec[i] );
 183         if (!read_pos || !size) continue;
 184         toread = size;
 185         while (toread)
 186         {
 187             long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
 188             if (res <= 0) goto error;
 189             toread -= res;
 190             read_pos += res;
 191         }
 192         if (pwrite( shared_fd, buffer, size, write_pos ) != size) goto error;
 193     }
 194     free( buffer );
 195     return 1;
 196
 197  error:
 198     release_object( mapping->shared_file );
 199     mapping->shared_file = NULL;
 200     if (buffer) free( buffer );
 201     return 0;
 202 }
 203
 204 /* retrieve the mapping parameters for an executable (PE) image */
 205 static int get_image_params( struct mapping *mapping )
 206 {
 207     IMAGE_DOS_HEADER dos;
 208     IMAGE_NT_HEADERS nt;
 209     IMAGE_SECTION_HEADER *sec = NULL;
 210     struct fd *fd;
 211     off_t pos;
 212     int unix_fd, size, toread;
 213
 214     /* load the headers */
 215
 216     if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
 217     if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
 218     if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
 219     if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
 220     pos = dos.e_lfanew;
 221
 222     if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
 223         goto error;
 224     pos += sizeof(nt.Signature);
 225     if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
 226     if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
 227         goto error;
 228     pos += sizeof(nt.FileHeader);
 229     /* zero out Optional header in the case it's not present or partial */
 230     memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
 231     toread = min( sizeof(nt.OptionalHeader), nt.FileHeader.SizeOfOptionalHeader );
 232     if (pread( unix_fd, &nt.OptionalHeader, toread, pos ) != toread) goto error;
 233     pos += nt.FileHeader.SizeOfOptionalHeader;
 234
 235     /* load the section headers */
 236
 237     size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
 238     if (!(sec = malloc( size ))) goto error;
 239     if (pread( unix_fd, sec, size, pos ) != size) goto error;
 240
 241     if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
 242
 243     if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
 244
 245     mapping->size        = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
 246     mapping->base        = (void *)nt.OptionalHeader.ImageBase;
 247     mapping->header_size = ROUND_SIZE_MASK( mapping->base, nt.OptionalHeader.SizeOfHeaders,
 248                                             nt.OptionalHeader.SectionAlignment - 1 );
 249     mapping->protect     = VPROT_IMAGE;
 250
 251     /* sanity check */
 252     if (mapping->header_size > mapping->size) goto error;
 253
 254     free( sec );
 255     release_object( fd );
 256     return 1;
 257
 258  error:
 259     if (sec) free( sec );
 260     release_object( fd );
 261     set_error( STATUS_INVALID_FILE_FOR_SECTION );
 262     return 0;
 263 }
 264
 265 /* get the size of the unix file associated with the mapping */
 266 inline static int get_file_size( struct file *file, file_pos_t *size )
 267 {
 268     struct stat st;
 269     int unix_fd = get_file_unix_fd( file );
 270
 271     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
 272     *size = st.st_size;
 273     return 1;
 274 }
 275
 276 static struct object *create_mapping( struct directory *root, const struct unicode_str *name,
 277                                       unsigned int attr, file_pos_t size, int protect,
 278                                       obj_handle_t handle )
 279 {
 280     struct mapping *mapping;
 281     int access = 0;
 282
 283     if (!page_mask) init_page_size();
 284
 285     if (!(mapping = create_named_object_dir( root, name, attr, &mapping_ops )))
 286         return NULL;
 287     if (get_error() == STATUS_OBJECT_NAME_EXISTS)
 288         return &mapping->obj;  /* Nothing else to do */
 289
 290     mapping->header_size = 0;
 291     mapping->base        = NULL;
 292     mapping->shared_file = NULL;
 293     mapping->shared_size = 0;
 294
 295     if (protect & VPROT_READ) access |= GENERIC_READ;
 296     if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
 297
 298     if (handle)
 299     {
 300         if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
 301         if (protect & VPROT_IMAGE)
 302         {
 303             if (!get_image_params( mapping )) goto error;
 304             return &mapping->obj;
 305         }
 306         if (!size)
 307         {
 308             if (!get_file_size( mapping->file, &size )) goto error;
 309             if (!size)
 310             {
 311                 set_error( STATUS_FILE_INVALID );
 312                 goto error;
 313             }
 314         }
 315         else
 316         {
 317             if (!grow_file( mapping->file, size )) goto error;
 318         }
 319     }
 320     else  /* Anonymous mapping (no associated file) */
 321     {
 322         if (!size || (protect & VPROT_IMAGE))
 323         {
 324             set_error( STATUS_INVALID_PARAMETER );
 325             mapping->file = NULL;
 326             goto error;
 327         }
 328         if (!(mapping->file = create_temp_file( access ))) goto error;
 329         if (!grow_file( mapping->file, size )) goto error;
 330     }
 331     mapping->size    = (size + page_mask) & ~((file_pos_t)page_mask);
 332     mapping->protect = protect;
 333     return &mapping->obj;
 334
 335  error:
 336     release_object( mapping );
 337     return NULL;
 338 }
 339
 340 static void mapping_dump( struct object *obj, int verbose )
 341 {
 342     struct mapping *mapping = (struct mapping *)obj;
 343     assert( obj->ops == &mapping_ops );
 344     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
 345              "shared_file=%p shared_size=%08x ",
 346              (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
 347              mapping->protect, mapping->file, mapping->header_size,
 348              mapping->base, mapping->shared_file, mapping->shared_size );
 349     dump_object_name( &mapping->obj );
 350     fputc( '\n', stderr );
 351 }
 352
 353 static struct fd *mapping_get_fd( struct object *obj )
 354 {
 355     struct mapping *mapping = (struct mapping *)obj;
 356     return get_obj_fd( (struct object *)mapping->file );
 357 }
 358
 359 static void mapping_destroy( struct object *obj )
 360 {
 361     struct mapping *mapping = (struct mapping *)obj;
 362     assert( obj->ops == &mapping_ops );
 363     if (mapping->file) release_object( mapping->file );
 364     if (mapping->shared_file)
 365     {
 366         release_object( mapping->shared_file );
 367         list_remove( &mapping->shared_entry );
 368     }
 369 }
 370
 371 int get_page_size(void)
 372 {
 373     if (!page_mask) init_page_size();
 374     return page_mask + 1;
 375 }
 376
 377 /* create a file mapping */
 378 DECL_HANDLER(create_mapping)
 379 {
 380     struct object *obj;
 381     struct unicode_str name;
 382     struct directory *root = NULL;
 383     file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
 384
 385     reply->handle = 0;
 386     get_req_unicode_str( &name );
 387     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 388         return;
 389
 390     if ((obj = create_mapping( root, &name, req->attributes, size, req->protect, req->file_handle )))
 391     {
 392         reply->handle = alloc_handle( current->process, obj, req->access,
 393                                       req->attributes & OBJ_INHERIT );
 394         release_object( obj );
 395     }
 396
 397     if (root) release_object( root );
 398 }
 399
 400 /* open a handle to a mapping */
 401 DECL_HANDLER(open_mapping)
 402 {
 403     struct unicode_str name;
 404     struct directory *root = NULL;
 405     struct mapping *mapping;
 406
 407     get_req_unicode_str( &name );
 408     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 409         return;
 410
 411     if ((mapping = open_object_dir( root, &name, req->attributes, &mapping_ops )))
 412     {
 413         reply->handle = alloc_handle( current->process, &mapping->obj, req->access,
 414                                       req->attributes & OBJ_INHERIT );
 415         release_object( mapping );
 416     }
 417
 418     if (root) release_object( root );
 419 }
 420
 421 /* get a mapping information */
 422 DECL_HANDLER(get_mapping_info)
 423 {
 424     struct mapping *mapping;
 425
 426     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 427                                                      0, &mapping_ops )))
 428     {
 429         reply->size_high   = (unsigned int)(mapping->size >> 32);
 430         reply->size_low    = (unsigned int)mapping->size;
 431         reply->protect     = mapping->protect;
 432         reply->header_size = mapping->header_size;
 433         reply->base        = mapping->base;
 434         reply->shared_file = 0;
 435         reply->shared_size = mapping->shared_size;
 436         if (mapping->shared_file)
 437             reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 438                                                GENERIC_READ|GENERIC_WRITE, 0 );
 439         release_object( mapping );
 440     }
 441 }