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