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     fd_close_handle,             /* close_handle */
  72     mapping_destroy              /* destroy */
  73 };
  74
  75 static struct list shared_list = LIST_INIT(shared_list);
  76
  77 #ifdef __i386__
  78
  79 /* These are always the same on an i386, and it will be faster this way */
  80 # define page_mask  0xfff
  81 # define page_shift 12
  82 # define init_page_size() do { /* nothing */ } while(0)
  83
  84 #else  /* __i386__ */
  85
  86 static int page_shift, page_mask;
  87
  88 static void init_page_size(void)
  89 {
  90     int page_size;
  91 # ifdef HAVE_GETPAGESIZE
  92     page_size = getpagesize();
  93 # else
  94 #  ifdef __svr4__
  95     page_size = sysconf(_SC_PAGESIZE);
  96 #  else
  97 #   error Cannot get the page size on this platform
  98 #  endif
  99 # endif
 100     page_mask = page_size - 1;
 101     /* Make sure we have a power of 2 */
 102     assert( !(page_size & page_mask) );
 103     page_shift = 0;
 104     while ((1 << page_shift) != page_size) page_shift++;
 105 }
 106 #endif  /* __i386__ */
 107
 108 #define ROUND_SIZE(size)  (((size) + page_mask) & ~page_mask)
 109
 110
 111 /* find the shared PE mapping for a given mapping */
 112 static struct file *get_shared_file( struct mapping *mapping )
 113 {
 114     struct mapping *ptr;
 115
 116     LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
 117         if (is_same_file( ptr->file, mapping->file ))
 118             return (struct file *)grab_object( ptr->shared_file );
 119     return NULL;
 120 }
 121
 122 /* return the size of the memory mapping and file range of a given section */
 123 static inline void get_section_sizes( const IMAGE_SECTION_HEADER *sec, size_t *map_size,
 124                                       off_t *file_start, size_t *file_size )
 125 {
 126     static const unsigned int sector_align = 0x1ff;
 127
 128     if (!sec->Misc.VirtualSize) *map_size = ROUND_SIZE( sec->SizeOfRawData );
 129     else *map_size = ROUND_SIZE( sec->Misc.VirtualSize );
 130
 131     *file_start = sec->PointerToRawData & ~sector_align;
 132     *file_size = (sec->SizeOfRawData + (sec->PointerToRawData & sector_align) + sector_align) & ~sector_align;
 133     if (*file_size > *map_size) *file_size = *map_size;
 134 }
 135
 136 /* allocate and fill the temp file for a shared PE image mapping */
 137 static int build_shared_mapping( struct mapping *mapping, int fd,
 138                                  IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
 139 {
 140     unsigned int i;
 141     size_t file_size, map_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             get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
 156             if (file_size > max_size) max_size = file_size;
 157             total_size += map_size;
 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( FILE_GENERIC_READ|FILE_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         get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
 180         write_pos = shared_pos;
 181         shared_pos += map_size;
 182         if (!sec[i].PointerToRawData || !file_size) continue;
 183         toread = file_size;
 184         while (toread)
 185         {
 186             long res = pread( fd, buffer + file_size - toread, toread, read_pos );
 187             if (!res && toread < 0x200)  /* partial sector at EOF is not an error */
 188             {
 189                 file_size -= toread;
 190                 break;
 191             }
 192             if (res <= 0) goto error;
 193             toread -= res;
 194             read_pos += res;
 195         }
 196         if (pwrite( shared_fd, buffer, file_size, write_pos ) != file_size) goto error;
 197     }
 198     free( buffer );
 199     return 1;
 200
 201  error:
 202     release_object( mapping->shared_file );
 203     mapping->shared_file = NULL;
 204     free( buffer );
 205     return 0;
 206 }
 207
 208 /* retrieve the mapping parameters for an executable (PE) image */
 209 static int get_image_params( struct mapping *mapping )
 210 {
 211     IMAGE_DOS_HEADER dos;
 212     IMAGE_NT_HEADERS nt;
 213     IMAGE_SECTION_HEADER *sec = NULL;
 214     struct fd *fd;
 215     off_t pos;
 216     int unix_fd, size, toread;
 217
 218     /* load the headers */
 219
 220     if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
 221     if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
 222     if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
 223     if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
 224     pos = dos.e_lfanew;
 225
 226     if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
 227         goto error;
 228     pos += sizeof(nt.Signature);
 229     if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
 230     if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
 231         goto error;
 232     pos += sizeof(nt.FileHeader);
 233     /* zero out Optional header in the case it's not present or partial */
 234     memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
 235     toread = min( sizeof(nt.OptionalHeader), nt.FileHeader.SizeOfOptionalHeader );
 236     if (pread( unix_fd, &nt.OptionalHeader, toread, pos ) != toread) goto error;
 237     pos += nt.FileHeader.SizeOfOptionalHeader;
 238
 239     /* load the section headers */
 240
 241     size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
 242     if (!(sec = malloc( size ))) goto error;
 243     if (pread( unix_fd, sec, size, pos ) != size) goto error;
 244
 245     if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
 246
 247     if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
 248
 249     mapping->size        = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
 250     mapping->base        = (void *)nt.OptionalHeader.ImageBase;
 251     mapping->header_size = max( pos + size, nt.OptionalHeader.SizeOfHeaders );
 252     mapping->protect     = VPROT_IMAGE;
 253
 254     /* sanity check */
 255     if (pos + size > mapping->size) goto error;
 256
 257     free( sec );
 258     release_object( fd );
 259     return 1;
 260
 261  error:
 262     free( sec );
 263     release_object( fd );
 264     set_error( STATUS_INVALID_FILE_FOR_SECTION );
 265     return 0;
 266 }
 267
 268 /* get the size of the unix file associated with the mapping */
 269 inline static int get_file_size( struct file *file, file_pos_t *size )
 270 {
 271     struct stat st;
 272     int unix_fd = get_file_unix_fd( file );
 273
 274     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
 275     *size = st.st_size;
 276     return 1;
 277 }
 278
 279 static struct object *create_mapping( struct directory *root, const struct unicode_str *name,
 280                                       unsigned int attr, file_pos_t size, int protect,
 281                                       obj_handle_t handle )
 282 {
 283     struct mapping *mapping;
 284     int access = 0;
 285
 286     if (!page_mask) init_page_size();
 287
 288     if (!(mapping = create_named_object_dir( root, name, attr, &mapping_ops )))
 289         return NULL;
 290     if (get_error() == STATUS_OBJECT_NAME_EXISTS)
 291         return &mapping->obj;  /* Nothing else to do */
 292
 293     mapping->header_size = 0;
 294     mapping->base        = NULL;
 295     mapping->shared_file = NULL;
 296     mapping->shared_size = 0;
 297
 298     if (protect & VPROT_READ) access |= FILE_READ_DATA;
 299     if (protect & VPROT_WRITE) access |= FILE_WRITE_DATA;
 300
 301     if (handle)
 302     {
 303         if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
 304         if (protect & VPROT_IMAGE)
 305         {
 306             if (!get_image_params( mapping )) goto error;
 307             return &mapping->obj;
 308         }
 309         if (!size)
 310         {
 311             if (!get_file_size( mapping->file, &size )) goto error;
 312             if (!size)
 313             {
 314                 set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
 315                 goto error;
 316             }
 317         }
 318         else
 319         {
 320             if (!grow_file( mapping->file, size )) goto error;
 321         }
 322     }
 323     else  /* Anonymous mapping (no associated file) */
 324     {
 325         if (!size || (protect & VPROT_IMAGE))
 326         {
 327             set_error( STATUS_INVALID_PARAMETER );
 328             mapping->file = NULL;
 329             goto error;
 330         }
 331         if (!(mapping->file = create_temp_file( access ))) goto error;
 332         if (!grow_file( mapping->file, size )) goto error;
 333     }
 334     mapping->size    = (size + page_mask) & ~((file_pos_t)page_mask);
 335     mapping->protect = protect;
 336     return &mapping->obj;
 337
 338  error:
 339     release_object( mapping );
 340     return NULL;
 341 }
 342
 343 static void mapping_dump( struct object *obj, int verbose )
 344 {
 345     struct mapping *mapping = (struct mapping *)obj;
 346     assert( obj->ops == &mapping_ops );
 347     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
 348              "shared_file=%p shared_size=%08x ",
 349              (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
 350              mapping->protect, mapping->file, mapping->header_size,
 351              mapping->base, mapping->shared_file, mapping->shared_size );
 352     dump_object_name( &mapping->obj );
 353     fputc( '\n', stderr );
 354 }
 355
 356 static struct fd *mapping_get_fd( struct object *obj )
 357 {
 358     struct mapping *mapping = (struct mapping *)obj;
 359     return get_obj_fd( (struct object *)mapping->file );
 360 }
 361
 362 static unsigned int mapping_map_access( struct object *obj, unsigned int access )
 363 {
 364     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | SECTION_QUERY | SECTION_MAP_READ;
 365     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | SECTION_MAP_WRITE;
 366     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SECTION_MAP_EXECUTE;
 367     if (access & GENERIC_ALL)     access |= SECTION_ALL_ACCESS;
 368     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 369 }
 370
 371 static void mapping_destroy( struct object *obj )
 372 {
 373     struct mapping *mapping = (struct mapping *)obj;
 374     assert( obj->ops == &mapping_ops );
 375     if (mapping->file) release_object( mapping->file );
 376     if (mapping->shared_file)
 377     {
 378         release_object( mapping->shared_file );
 379         list_remove( &mapping->shared_entry );
 380     }
 381 }
 382
 383 int get_page_size(void)
 384 {
 385     if (!page_mask) init_page_size();
 386     return page_mask + 1;
 387 }
 388
 389 /* create a file mapping */
 390 DECL_HANDLER(create_mapping)
 391 {
 392     struct object *obj;
 393     struct unicode_str name;
 394     struct directory *root = NULL;
 395     file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
 396
 397     reply->handle = 0;
 398     get_req_unicode_str( &name );
 399     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 400         return;
 401
 402     if ((obj = create_mapping( root, &name, req->attributes, size, req->protect, req->file_handle )))
 403     {
 404         reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
 405         release_object( obj );
 406     }
 407
 408     if (root) release_object( root );
 409 }
 410
 411 /* open a handle to a mapping */
 412 DECL_HANDLER(open_mapping)
 413 {
 414     struct unicode_str name;
 415     struct directory *root = NULL;
 416     struct mapping *mapping;
 417
 418     get_req_unicode_str( &name );
 419     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 420         return;
 421
 422     if ((mapping = open_object_dir( root, &name, req->attributes, &mapping_ops )))
 423     {
 424         reply->handle = alloc_handle( current->process, &mapping->obj, req->access, req->attributes );
 425         release_object( mapping );
 426     }
 427
 428     if (root) release_object( root );
 429 }
 430
 431 /* get a mapping information */
 432 DECL_HANDLER(get_mapping_info)
 433 {
 434     struct mapping *mapping;
 435     struct fd *fd;
 436
 437     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 438                                                      0, &mapping_ops )))
 439     {
 440         reply->size_high   = (unsigned int)(mapping->size >> 32);
 441         reply->size_low    = (unsigned int)mapping->size;
 442         reply->protect     = mapping->protect;
 443         reply->header_size = mapping->header_size;
 444         reply->base        = mapping->base;
 445         reply->shared_file = 0;
 446         reply->shared_size = mapping->shared_size;
 447         if ((fd = get_obj_fd( &mapping->obj )))
 448         {
 449             if (!is_fd_removable(fd))
 450                 reply->mapping = alloc_handle( current->process, mapping, 0, 0 );
 451             release_object( fd );
 452         }
 453         if (mapping->shared_file)
 454         {
 455             if (!(reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 456                                                      GENERIC_READ|GENERIC_WRITE, 0 )))
 457             {
 458                 if (reply->mapping) close_handle( current->process, reply->mapping );
 459             }
 460         }
 461         release_object( mapping );
 462     }
 463 }