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