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 of a given section */
 123 static inline unsigned int get_section_map_size( const IMAGE_SECTION_HEADER *sec )
 124 {
 125     if (!sec->Misc.VirtualSize) return ROUND_SIZE( sec->SizeOfRawData );
 126     else return ROUND_SIZE( sec->Misc.VirtualSize );
 127 }
 128
 129 /* return the size of the file mapping of a given section */
 130 static inline unsigned int get_section_filemap_size( const IMAGE_SECTION_HEADER *sec )
 131 {
 132     if (!sec->Misc.VirtualSize) return sec->SizeOfRawData;
 133     else return min( sec->SizeOfRawData, ROUND_SIZE( sec->Misc.VirtualSize ) );
 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, size, max_size, total_size;
 141     off_t shared_pos, read_pos, write_pos;
 142     char *buffer = NULL;
 143     int shared_fd;
 144     long toread;
 145
 146     /* compute the total size of the shared mapping */
 147
 148     total_size = max_size = 0;
 149     for (i = 0; i < nb_sec; i++)
 150     {
 151         if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
 152             (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
 153         {
 154             size = get_section_filemap_size( &sec[i] );
 155             if (size > max_size) max_size = size;
 156             total_size += get_section_map_size( &sec[i] );
 157         }
 158     }
 159     if (!(mapping->shared_size = total_size)) return 1;  /* nothing to do */
 160
 161     if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
 162
 163     /* create a temp file for the mapping */
 164
 165     if (!(mapping->shared_file = create_temp_file( FILE_GENERIC_READ|FILE_GENERIC_WRITE ))) return 0;
 166     if (!grow_file( mapping->shared_file, total_size )) goto error;
 167     if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
 168
 169     if (!(buffer = malloc( max_size ))) goto error;
 170
 171     /* copy the shared sections data into the temp file */
 172
 173     shared_pos = 0;
 174     for (i = 0; i < nb_sec; i++)
 175     {
 176         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
 177         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
 178         write_pos = shared_pos;
 179         shared_pos += get_section_map_size( &sec[i] );
 180         read_pos = sec[i].PointerToRawData;
 181         size = get_section_filemap_size( &sec[i] );
 182         if (!read_pos || !size) continue;
 183         toread = size;
 184         while (toread)
 185         {
 186             long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
 187             if (res <= 0) goto error;
 188             toread -= res;
 189             read_pos += res;
 190         }
 191         if (pwrite( shared_fd, buffer, size, write_pos ) != size) goto error;
 192     }
 193     free( buffer );
 194     return 1;
 195
 196  error:
 197     release_object( mapping->shared_file );
 198     mapping->shared_file = NULL;
 199     free( buffer );
 200     return 0;
 201 }
 202
 203 /* retrieve the mapping parameters for an executable (PE) image */
 204 static int get_image_params( struct mapping *mapping )
 205 {
 206     IMAGE_DOS_HEADER dos;
 207     IMAGE_NT_HEADERS nt;
 208     IMAGE_SECTION_HEADER *sec = NULL;
 209     struct fd *fd;
 210     off_t pos;
 211     int unix_fd, size, toread;
 212
 213     /* load the headers */
 214
 215     if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
 216     if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
 217     if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
 218     if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
 219     pos = dos.e_lfanew;
 220
 221     if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
 222         goto error;
 223     pos += sizeof(nt.Signature);
 224     if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
 225     if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
 226         goto error;
 227     pos += sizeof(nt.FileHeader);
 228     /* zero out Optional header in the case it's not present or partial */
 229     memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
 230     toread = min( sizeof(nt.OptionalHeader), nt.FileHeader.SizeOfOptionalHeader );
 231     if (pread( unix_fd, &nt.OptionalHeader, toread, pos ) != toread) goto error;
 232     pos += nt.FileHeader.SizeOfOptionalHeader;
 233
 234     /* load the section headers */
 235
 236     size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
 237     if (!(sec = malloc( size ))) goto error;
 238     if (pread( unix_fd, sec, size, pos ) != size) goto error;
 239
 240     if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
 241
 242     if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
 243
 244     mapping->size        = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
 245     mapping->base        = (void *)nt.OptionalHeader.ImageBase;
 246     mapping->header_size = pos + size;
 247     mapping->protect     = VPROT_IMAGE;
 248
 249     /* sanity check */
 250     if (mapping->header_size > mapping->size) goto error;
 251
 252     free( sec );
 253     release_object( fd );
 254     return 1;
 255
 256  error:
 257     free( sec );
 258     release_object( fd );
 259     set_error( STATUS_INVALID_FILE_FOR_SECTION );
 260     return 0;
 261 }
 262
 263 /* get the size of the unix file associated with the mapping */
 264 inline static int get_file_size( struct file *file, file_pos_t *size )
 265 {
 266     struct stat st;
 267     int unix_fd = get_file_unix_fd( file );
 268
 269     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
 270     *size = st.st_size;
 271     return 1;
 272 }
 273
 274 static struct object *create_mapping( struct directory *root, const struct unicode_str *name,
 275                                       unsigned int attr, file_pos_t size, int protect,
 276                                       obj_handle_t handle )
 277 {
 278     struct mapping *mapping;
 279     int access = 0;
 280
 281     if (!page_mask) init_page_size();
 282
 283     if (!(mapping = create_named_object_dir( root, name, attr, &mapping_ops )))
 284         return NULL;
 285     if (get_error() == STATUS_OBJECT_NAME_EXISTS)
 286         return &mapping->obj;  /* Nothing else to do */
 287
 288     mapping->header_size = 0;
 289     mapping->base        = NULL;
 290     mapping->shared_file = NULL;
 291     mapping->shared_size = 0;
 292
 293     if (protect & VPROT_READ) access |= FILE_READ_DATA;
 294     if (protect & VPROT_WRITE) access |= FILE_WRITE_DATA;
 295
 296     if (handle)
 297     {
 298         if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
 299         if (protect & VPROT_IMAGE)
 300         {
 301             if (!get_image_params( mapping )) goto error;
 302             return &mapping->obj;
 303         }
 304         if (!size)
 305         {
 306             if (!get_file_size( mapping->file, &size )) goto error;
 307             if (!size)
 308             {
 309                 set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
 310                 goto error;
 311             }
 312         }
 313         else
 314         {
 315             if (!grow_file( mapping->file, size )) goto error;
 316         }
 317     }
 318     else  /* Anonymous mapping (no associated file) */
 319     {
 320         if (!size || (protect & VPROT_IMAGE))
 321         {
 322             set_error( STATUS_INVALID_PARAMETER );
 323             mapping->file = NULL;
 324             goto error;
 325         }
 326         if (!(mapping->file = create_temp_file( access ))) goto error;
 327         if (!grow_file( mapping->file, size )) goto error;
 328     }
 329     mapping->size    = (size + page_mask) & ~((file_pos_t)page_mask);
 330     mapping->protect = protect;
 331     return &mapping->obj;
 332
 333  error:
 334     release_object( mapping );
 335     return NULL;
 336 }
 337
 338 static void mapping_dump( struct object *obj, int verbose )
 339 {
 340     struct mapping *mapping = (struct mapping *)obj;
 341     assert( obj->ops == &mapping_ops );
 342     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
 343              "shared_file=%p shared_size=%08x ",
 344              (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
 345              mapping->protect, mapping->file, mapping->header_size,
 346              mapping->base, mapping->shared_file, mapping->shared_size );
 347     dump_object_name( &mapping->obj );
 348     fputc( '\n', stderr );
 349 }
 350
 351 static struct fd *mapping_get_fd( struct object *obj )
 352 {
 353     struct mapping *mapping = (struct mapping *)obj;
 354     return get_obj_fd( (struct object *)mapping->file );
 355 }
 356
 357 static unsigned int mapping_map_access( struct object *obj, unsigned int access )
 358 {
 359     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | SECTION_QUERY | SECTION_MAP_READ;
 360     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | SECTION_MAP_WRITE;
 361     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SECTION_MAP_EXECUTE;
 362     if (access & GENERIC_ALL)     access |= SECTION_ALL_ACCESS;
 363     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 364 }
 365
 366 static void mapping_destroy( struct object *obj )
 367 {
 368     struct mapping *mapping = (struct mapping *)obj;
 369     assert( obj->ops == &mapping_ops );
 370     if (mapping->file) release_object( mapping->file );
 371     if (mapping->shared_file)
 372     {
 373         release_object( mapping->shared_file );
 374         list_remove( &mapping->shared_entry );
 375     }
 376 }
 377
 378 int get_page_size(void)
 379 {
 380     if (!page_mask) init_page_size();
 381     return page_mask + 1;
 382 }
 383
 384 /* create a file mapping */
 385 DECL_HANDLER(create_mapping)
 386 {
 387     struct object *obj;
 388     struct unicode_str name;
 389     struct directory *root = NULL;
 390     file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
 391
 392     reply->handle = 0;
 393     get_req_unicode_str( &name );
 394     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 395         return;
 396
 397     if ((obj = create_mapping( root, &name, req->attributes, size, req->protect, req->file_handle )))
 398     {
 399         reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
 400         release_object( obj );
 401     }
 402
 403     if (root) release_object( root );
 404 }
 405
 406 /* open a handle to a mapping */
 407 DECL_HANDLER(open_mapping)
 408 {
 409     struct unicode_str name;
 410     struct directory *root = NULL;
 411     struct mapping *mapping;
 412
 413     get_req_unicode_str( &name );
 414     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 415         return;
 416
 417     if ((mapping = open_object_dir( root, &name, req->attributes, &mapping_ops )))
 418     {
 419         reply->handle = alloc_handle( current->process, &mapping->obj, req->access, req->attributes );
 420         release_object( mapping );
 421     }
 422
 423     if (root) release_object( root );
 424 }
 425
 426 /* get a mapping information */
 427 DECL_HANDLER(get_mapping_info)
 428 {
 429     struct mapping *mapping;
 430
 431     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 432                                                      0, &mapping_ops )))
 433     {
 434         reply->size_high   = (unsigned int)(mapping->size >> 32);
 435         reply->size_low    = (unsigned int)mapping->size;
 436         reply->protect     = mapping->protect;
 437         reply->header_size = mapping->header_size;
 438         reply->base        = mapping->base;
 439         reply->shared_file = 0;
 440         reply->shared_size = mapping->shared_size;
 441         if (mapping->shared_file)
 442             reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 443                                                GENERIC_READ|GENERIC_WRITE, 0 );
 444         release_object( mapping );
 445     }
 446 }