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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 unsigned int mapping_map_access( struct object *obj, unsigned int access );
  57 static void mapping_destroy( struct object *obj );
  58
  59 static const struct object_ops mapping_ops =
  60 {
  61     sizeof(struct mapping),      /* size */
  62     mapping_dump,                /* dump */
  63     no_add_queue,                /* add_queue */
  64     NULL,                        /* remove_queue */
  65     NULL,                        /* signaled */
  66     NULL,                        /* satisfied */
  67     no_signal,                   /* signal */
  68     mapping_get_fd,              /* get_fd */
  69     mapping_map_access,          /* map_access */
  70     no_lookup_name,              /* lookup_name */
  71     no_open_file,                /* open_file */
  72     fd_close_handle,             /* close_handle */
  73     mapping_destroy              /* destroy */
  74 };
  75
  76 static struct list shared_list = LIST_INIT(shared_list);
  77
  78 #ifdef __i386__
  79
  80 /* These are always the same on an i386, and it will be faster this way */
  81 # define page_mask  0xfff
  82 # define page_shift 12
  83 # define init_page_size() do { /* nothing */ } while(0)
  84
  85 #else  /* __i386__ */
  86
  87 static int page_shift, page_mask;
  88
  89 static void init_page_size(void)
  90 {
  91     int page_size;
  92 # ifdef HAVE_GETPAGESIZE
  93     page_size = getpagesize();
  94 # else
  95 #  ifdef __svr4__
  96     page_size = sysconf(_SC_PAGESIZE);
  97 #  else
  98 #   error Cannot get the page size on this platform
  99 #  endif
 100 # endif
 101     page_mask = page_size - 1;
 102     /* Make sure we have a power of 2 */
 103     assert( !(page_size & page_mask) );
 104     page_shift = 0;
 105     while ((1 << page_shift) != page_size) page_shift++;
 106 }
 107 #endif  /* __i386__ */
 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 and file range of a given section */
 124 static inline void get_section_sizes( const IMAGE_SECTION_HEADER *sec, size_t *map_size,
 125                                       off_t *file_start, size_t *file_size )
 126 {
 127     static const unsigned int sector_align = 0x1ff;
 128
 129     if (!sec->Misc.VirtualSize) *map_size = ROUND_SIZE( sec->SizeOfRawData );
 130     else *map_size = ROUND_SIZE( sec->Misc.VirtualSize );
 131
 132     *file_start = sec->PointerToRawData & ~sector_align;
 133     *file_size = (sec->SizeOfRawData + (sec->PointerToRawData & sector_align) + sector_align) & ~sector_align;
 134     if (*file_size > *map_size) *file_size = *map_size;
 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;
 142     size_t file_size, map_size, max_size, total_size;
 143     off_t shared_pos, read_pos, write_pos;
 144     char *buffer = NULL;
 145     int shared_fd;
 146     long toread;
 147
 148     /* compute the total size of the shared mapping */
 149
 150     total_size = max_size = 0;
 151     for (i = 0; i < nb_sec; i++)
 152     {
 153         if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
 154             (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
 155         {
 156             get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
 157             if (file_size > max_size) max_size = file_size;
 158             total_size += map_size;
 159         }
 160     }
 161     if (!(mapping->shared_size = total_size)) return 1;  /* nothing to do */
 162
 163     if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
 164
 165     /* create a temp file for the mapping */
 166
 167     if (!(mapping->shared_file = create_temp_file( FILE_GENERIC_READ|FILE_GENERIC_WRITE ))) return 0;
 168     if (!grow_file( mapping->shared_file, total_size )) goto error;
 169     if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
 170
 171     if (!(buffer = malloc( max_size ))) goto error;
 172
 173     /* copy the shared sections data into the temp file */
 174
 175     shared_pos = 0;
 176     for (i = 0; i < nb_sec; i++)
 177     {
 178         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
 179         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
 180         get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
 181         write_pos = shared_pos;
 182         shared_pos += map_size;
 183         if (!sec[i].PointerToRawData || !file_size) continue;
 184         toread = file_size;
 185         while (toread)
 186         {
 187             long res = pread( fd, buffer + file_size - toread, toread, read_pos );
 188             if (!res && toread < 0x200)  /* partial sector at EOF is not an error */
 189             {
 190                 file_size -= toread;
 191                 break;
 192             }
 193             if (res <= 0) goto error;
 194             toread -= res;
 195             read_pos += res;
 196         }
 197         if (pwrite( shared_fd, buffer, file_size, write_pos ) != file_size) goto error;
 198     }
 199     free( buffer );
 200     return 1;
 201
 202  error:
 203     release_object( mapping->shared_file );
 204     mapping->shared_file = NULL;
 205     free( buffer );
 206     return 0;
 207 }
 208
 209 /* retrieve the mapping parameters for an executable (PE) image */
 210 static int get_image_params( struct mapping *mapping )
 211 {
 212     IMAGE_DOS_HEADER dos;
 213     IMAGE_NT_HEADERS nt;
 214     IMAGE_SECTION_HEADER *sec = NULL;
 215     struct fd *fd;
 216     off_t pos;
 217     int unix_fd, size, toread;
 218
 219     /* load the headers */
 220
 221     if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
 222     if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
 223     if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
 224     if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
 225     pos = dos.e_lfanew;
 226
 227     if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
 228         goto error;
 229     pos += sizeof(nt.Signature);
 230     if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
 231     if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
 232         goto error;
 233     pos += sizeof(nt.FileHeader);
 234     /* zero out Optional header in the case it's not present or partial */
 235     memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
 236     toread = min( sizeof(nt.OptionalHeader), nt.FileHeader.SizeOfOptionalHeader );
 237     if (pread( unix_fd, &nt.OptionalHeader, toread, pos ) != toread) goto error;
 238     pos += nt.FileHeader.SizeOfOptionalHeader;
 239
 240     /* load the section headers */
 241
 242     size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
 243     if (!(sec = malloc( size ))) goto error;
 244     if (pread( unix_fd, sec, size, pos ) != size) goto error;
 245
 246     if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
 247
 248     if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
 249
 250     mapping->size        = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
 251     mapping->base        = (void *)nt.OptionalHeader.ImageBase;
 252     mapping->header_size = max( pos + size, nt.OptionalHeader.SizeOfHeaders );
 253     mapping->protect     = VPROT_IMAGE;
 254
 255     /* sanity check */
 256     if (pos + size > mapping->size) goto error;
 257
 258     free( sec );
 259     release_object( fd );
 260     return 1;
 261
 262  error:
 263     free( sec );
 264     release_object( fd );
 265     set_error( STATUS_INVALID_FILE_FOR_SECTION );
 266     return 0;
 267 }
 268
 269 /* get the size of the unix file associated with the mapping */
 270 static inline int get_file_size( struct file *file, file_pos_t *size )
 271 {
 272     struct stat st;
 273     int unix_fd = get_file_unix_fd( file );
 274
 275     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
 276     *size = st.st_size;
 277     return 1;
 278 }
 279
 280 static struct object *create_mapping( struct directory *root, const struct unicode_str *name,
 281                                       unsigned int attr, file_pos_t size, int protect,
 282                                       obj_handle_t handle )
 283 {
 284     struct mapping *mapping;
 285     int access = 0;
 286
 287     if (!page_mask) init_page_size();
 288
 289     if (!(mapping = create_named_object_dir( root, name, attr, &mapping_ops )))
 290         return NULL;
 291     if (get_error() == STATUS_OBJECT_NAME_EXISTS)
 292         return &mapping->obj;  /* Nothing else to do */
 293
 294     mapping->header_size = 0;
 295     mapping->base        = NULL;
 296     mapping->shared_file = NULL;
 297     mapping->shared_size = 0;
 298
 299     if (protect & VPROT_READ) access |= FILE_READ_DATA;
 300     if (protect & VPROT_WRITE) access |= FILE_WRITE_DATA;
 301
 302     if (handle)
 303     {
 304         if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
 305         if (protect & VPROT_IMAGE)
 306         {
 307             if (!get_image_params( mapping )) goto error;
 308             return &mapping->obj;
 309         }
 310         if (!size)
 311         {
 312             if (!get_file_size( mapping->file, &size )) goto error;
 313             if (!size)
 314             {
 315                 set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
 316                 goto error;
 317             }
 318         }
 319         else
 320         {
 321             if (!grow_file( mapping->file, size )) goto error;
 322         }
 323     }
 324     else  /* Anonymous mapping (no associated file) */
 325     {
 326         if (!size || (protect & VPROT_IMAGE))
 327         {
 328             set_error( STATUS_INVALID_PARAMETER );
 329             mapping->file = NULL;
 330             goto error;
 331         }
 332         if (!(mapping->file = create_temp_file( access ))) goto error;
 333         if (!grow_file( mapping->file, size )) goto error;
 334     }
 335     mapping->size    = (size + page_mask) & ~((file_pos_t)page_mask);
 336     mapping->protect = protect;
 337     return &mapping->obj;
 338
 339  error:
 340     release_object( mapping );
 341     return NULL;
 342 }
 343
 344 static void mapping_dump( struct object *obj, int verbose )
 345 {
 346     struct mapping *mapping = (struct mapping *)obj;
 347     assert( obj->ops == &mapping_ops );
 348     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
 349              "shared_file=%p shared_size=%08x ",
 350              (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
 351              mapping->protect, mapping->file, mapping->header_size,
 352              mapping->base, mapping->shared_file, mapping->shared_size );
 353     dump_object_name( &mapping->obj );
 354     fputc( '\n', stderr );
 355 }
 356
 357 static struct fd *mapping_get_fd( struct object *obj )
 358 {
 359     struct mapping *mapping = (struct mapping *)obj;
 360     return get_obj_fd( (struct object *)mapping->file );
 361 }
 362
 363 static unsigned int mapping_map_access( struct object *obj, unsigned int access )
 364 {
 365     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | SECTION_QUERY | SECTION_MAP_READ;
 366     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | SECTION_MAP_WRITE;
 367     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SECTION_MAP_EXECUTE;
 368     if (access & GENERIC_ALL)     access |= SECTION_ALL_ACCESS;
 369     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 370 }
 371
 372 static void mapping_destroy( struct object *obj )
 373 {
 374     struct mapping *mapping = (struct mapping *)obj;
 375     assert( obj->ops == &mapping_ops );
 376     if (mapping->file) release_object( mapping->file );
 377     if (mapping->shared_file)
 378     {
 379         release_object( mapping->shared_file );
 380         list_remove( &mapping->shared_entry );
 381     }
 382 }
 383
 384 int get_page_size(void)
 385 {
 386     if (!page_mask) init_page_size();
 387     return page_mask + 1;
 388 }
 389
 390 /* create a file mapping */
 391 DECL_HANDLER(create_mapping)
 392 {
 393     struct object *obj;
 394     struct unicode_str name;
 395     struct directory *root = NULL;
 396     file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
 397
 398     reply->handle = 0;
 399     get_req_unicode_str( &name );
 400     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 401         return;
 402
 403     if ((obj = create_mapping( root, &name, req->attributes, size, req->protect, req->file_handle )))
 404     {
 405         reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
 406         release_object( obj );
 407     }
 408
 409     if (root) release_object( root );
 410 }
 411
 412 /* open a handle to a mapping */
 413 DECL_HANDLER(open_mapping)
 414 {
 415     struct unicode_str name;
 416     struct directory *root = NULL;
 417     struct mapping *mapping;
 418
 419     get_req_unicode_str( &name );
 420     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 421         return;
 422
 423     if ((mapping = open_object_dir( root, &name, req->attributes, &mapping_ops )))
 424     {
 425         reply->handle = alloc_handle( current->process, &mapping->obj, req->access, req->attributes );
 426         release_object( mapping );
 427     }
 428
 429     if (root) release_object( root );
 430 }
 431
 432 /* get a mapping information */
 433 DECL_HANDLER(get_mapping_info)
 434 {
 435     struct mapping *mapping;
 436     struct fd *fd;
 437
 438     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 439                                                      0, &mapping_ops )))
 440     {
 441         reply->size_high   = (unsigned int)(mapping->size >> 32);
 442         reply->size_low    = (unsigned int)mapping->size;
 443         reply->protect     = mapping->protect;
 444         reply->header_size = mapping->header_size;
 445         reply->base        = mapping->base;
 446         reply->shared_file = 0;
 447         reply->shared_size = mapping->shared_size;
 448         if ((fd = get_obj_fd( &mapping->obj )))
 449         {
 450             if (!is_fd_removable(fd))
 451                 reply->mapping = alloc_handle( current->process, mapping, 0, 0 );
 452             release_object( fd );
 453         }
 454         if (mapping->shared_file)
 455         {
 456             if (!(reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 457                                                      GENERIC_READ|GENERIC_WRITE, 0 )))
 458             {
 459                 if (reply->mapping) close_handle( current->process, reply->mapping );
 460             }
 461         }
 462         release_object( mapping );
 463     }
 464 }