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
  33 #include "file.h"
  34 #include "handle.h"
  35 #include "thread.h"
  36 #include "request.h"
  37
  38 struct mapping
  39 {
  40     struct object   obj;             /* object header */
  41     file_pos_t      size;            /* mapping size */
  42     int             protect;         /* protection flags */
  43     struct file    *file;            /* file mapped */
  44     int             header_size;     /* size of headers (for PE image mapping) */
  45     void           *base;            /* default base addr (for PE image mapping) */
  46     struct file    *shared_file;     /* temp file for shared PE mapping */
  47     int             shared_size;     /* shared mapping total size */
  48     struct list     shared_entry;    /* entry in global shared PE mappings list */
  49 };
  50
  51 static void mapping_dump( struct object *obj, int verbose );
  52 static struct fd *mapping_get_fd( struct object *obj );
  53 static void mapping_destroy( struct object *obj );
  54
  55 static const struct object_ops mapping_ops =
  56 {
  57     sizeof(struct mapping),      /* size */
  58     mapping_dump,                /* dump */
  59     no_add_queue,                /* add_queue */
  60     NULL,                        /* remove_queue */
  61     NULL,                        /* signaled */
  62     NULL,                        /* satisfied */
  63     no_signal,                   /* signal */
  64     mapping_get_fd,              /* get_fd */
  65     no_close_handle,             /* close_handle */
  66     mapping_destroy              /* destroy */
  67 };
  68
  69 static struct list shared_list = LIST_INIT(shared_list);
  70
  71 #ifdef __i386__
  72
  73 /* These are always the same on an i386, and it will be faster this way */
  74 # define page_mask  0xfff
  75 # define page_shift 12
  76 # define init_page_size() do { /* nothing */ } while(0)
  77
  78 #else  /* __i386__ */
  79
  80 static int page_shift, page_mask;
  81
  82 static void init_page_size(void)
  83 {
  84     int page_size;
  85 # ifdef HAVE_GETPAGESIZE
  86     page_size = getpagesize();
  87 # else
  88 #  ifdef __svr4__
  89     page_size = sysconf(_SC_PAGESIZE);
  90 #  else
  91 #   error Cannot get the page size on this platform
  92 #  endif
  93 # endif
  94     page_mask = page_size - 1;
  95     /* Make sure we have a power of 2 */
  96     assert( !(page_size & page_mask) );
  97     page_shift = 0;
  98     while ((1 << page_shift) != page_size) page_shift++;
  99 }
 100 #endif  /* __i386__ */
 101
 102 #define ROUND_SIZE_MASK(addr,size,mask) \
 103    (((int)(size) + ((int)(addr) & (mask)) + (mask)) & ~(mask))
 104
 105 #define ROUND_SIZE(size)  (((size) + page_mask) & ~page_mask)
 106
 107
 108 /* find the shared PE mapping for a given mapping */
 109 static struct file *get_shared_file( struct mapping *mapping )
 110 {
 111     struct mapping *ptr;
 112
 113     LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
 114         if (is_same_file( ptr->file, mapping->file ))
 115             return (struct file *)grab_object( ptr->shared_file );
 116     return NULL;
 117 }
 118
 119 /* allocate and fill the temp file for a shared PE image mapping */
 120 static int build_shared_mapping( struct mapping *mapping, int fd,
 121                                  IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
 122 {
 123     unsigned int i, max_size, total_size;
 124     off_t shared_pos, read_pos, write_pos;
 125     char *buffer = NULL;
 126     int shared_fd;
 127     long toread;
 128
 129     /* compute the total size of the shared mapping */
 130
 131     total_size = max_size = 0;
 132     for (i = 0; i < nb_sec; i++)
 133     {
 134         if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
 135             (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
 136         {
 137             unsigned int size = ROUND_SIZE( sec[i].Misc.VirtualSize );
 138             if (size > max_size) max_size = size;
 139             total_size += size;
 140         }
 141     }
 142     if (!(mapping->shared_size = total_size)) return 1;  /* nothing to do */
 143
 144     if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
 145
 146     /* create a temp file for the mapping */
 147
 148     if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
 149     if (!grow_file( mapping->shared_file, total_size )) goto error;
 150     if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
 151
 152     if (!(buffer = malloc( max_size ))) goto error;
 153
 154     /* copy the shared sections data into the temp file */
 155
 156     shared_pos = 0;
 157     for (i = 0; i < nb_sec; i++)
 158     {
 159         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
 160         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
 161         write_pos = shared_pos;
 162         shared_pos += ROUND_SIZE( sec[i].Misc.VirtualSize );
 163         if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
 164         read_pos = sec[i].PointerToRawData;
 165         toread = sec[i].SizeOfRawData;
 166         while (toread)
 167         {
 168             long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
 169             if (res <= 0) goto error;
 170             toread -= res;
 171             read_pos += res;
 172         }
 173         if (pwrite( shared_fd, buffer, sec[i].SizeOfRawData, write_pos ) != sec[i].SizeOfRawData)
 174             goto error;
 175     }
 176     free( buffer );
 177     return 1;
 178
 179  error:
 180     release_object( mapping->shared_file );
 181     mapping->shared_file = NULL;
 182     if (buffer) free( buffer );
 183     return 0;
 184 }
 185
 186 /* retrieve the mapping parameters for an executable (PE) image */
 187 static int get_image_params( struct mapping *mapping )
 188 {
 189     IMAGE_DOS_HEADER dos;
 190     IMAGE_NT_HEADERS nt;
 191     IMAGE_SECTION_HEADER *sec = NULL;
 192     struct fd *fd;
 193     off_t pos;
 194     int unix_fd, size;
 195
 196     /* load the headers */
 197
 198     if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
 199     if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
 200     if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
 201     if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
 202     pos = dos.e_lfanew;
 203
 204     if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
 205         goto error;
 206     pos += sizeof(nt.Signature);
 207     if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
 208     if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
 209         goto error;
 210     pos += sizeof(nt.FileHeader);
 211     /* zero out Optional header in the case it's not present or partial */
 212     memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
 213     if (pread( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader,
 214                pos ) != nt.FileHeader.SizeOfOptionalHeader) goto error;
 215     pos += nt.FileHeader.SizeOfOptionalHeader;
 216
 217     /* load the section headers */
 218
 219     size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
 220     if (!(sec = malloc( size ))) goto error;
 221     if (pread( unix_fd, sec, size, pos ) != size) goto error;
 222
 223     if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
 224
 225     if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
 226
 227     mapping->size        = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
 228     mapping->base        = (void *)nt.OptionalHeader.ImageBase;
 229     mapping->header_size = ROUND_SIZE_MASK( mapping->base, nt.OptionalHeader.SizeOfHeaders,
 230                                             nt.OptionalHeader.SectionAlignment - 1 );
 231     mapping->protect     = VPROT_IMAGE;
 232
 233     /* sanity check */
 234     if (mapping->header_size > mapping->size) goto error;
 235
 236     free( sec );
 237     release_object( fd );
 238     return 1;
 239
 240  error:
 241     if (sec) free( sec );
 242     release_object( fd );
 243     set_error( STATUS_INVALID_FILE_FOR_SECTION );
 244     return 0;
 245 }
 246
 247 /* get the size of the unix file associated with the mapping */
 248 inline static int get_file_size( struct file *file, file_pos_t *size )
 249 {
 250     struct stat st;
 251     int unix_fd = get_file_unix_fd( file );
 252
 253     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
 254     *size = st.st_size;
 255     return 1;
 256 }
 257
 258 static struct object *create_mapping( file_pos_t size, int protect, obj_handle_t handle,
 259                                       const WCHAR *name, size_t len )
 260 {
 261     struct mapping *mapping;
 262     int access = 0;
 263
 264     if (!page_mask) init_page_size();
 265
 266     if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, len )))
 267         return NULL;
 268     if (get_error() == STATUS_OBJECT_NAME_COLLISION)
 269         return &mapping->obj;  /* Nothing else to do */
 270
 271     mapping->header_size = 0;
 272     mapping->base        = NULL;
 273     mapping->shared_file = NULL;
 274     mapping->shared_size = 0;
 275
 276     if (protect & VPROT_READ) access |= GENERIC_READ;
 277     if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
 278
 279     if (handle)
 280     {
 281         if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
 282         if (protect & VPROT_IMAGE)
 283         {
 284             if (!get_image_params( mapping )) goto error;
 285             return &mapping->obj;
 286         }
 287         if (!size)
 288         {
 289             if (!get_file_size( mapping->file, &size )) goto error;
 290             if (!size)
 291             {
 292                 set_error( STATUS_FILE_INVALID );
 293                 goto error;
 294             }
 295         }
 296         else
 297         {
 298             if (!grow_file( mapping->file, size )) goto error;
 299         }
 300     }
 301     else  /* Anonymous mapping (no associated file) */
 302     {
 303         if (!size || (protect & VPROT_IMAGE))
 304         {
 305             set_error( STATUS_INVALID_PARAMETER );
 306             mapping->file = NULL;
 307             goto error;
 308         }
 309         if (!(mapping->file = create_temp_file( access ))) goto error;
 310         if (!grow_file( mapping->file, size )) goto error;
 311     }
 312     mapping->size    = (size + page_mask) & ~((file_pos_t)page_mask);
 313     mapping->protect = protect;
 314     return &mapping->obj;
 315
 316  error:
 317     release_object( mapping );
 318     return NULL;
 319 }
 320
 321 static void mapping_dump( struct object *obj, int verbose )
 322 {
 323     struct mapping *mapping = (struct mapping *)obj;
 324     assert( obj->ops == &mapping_ops );
 325     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
 326              "shared_file=%p shared_size=%08x ",
 327              (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
 328              mapping->protect, mapping->file, mapping->header_size,
 329              mapping->base, mapping->shared_file, mapping->shared_size );
 330     dump_object_name( &mapping->obj );
 331     fputc( '\n', stderr );
 332 }
 333
 334 static struct fd *mapping_get_fd( struct object *obj )
 335 {
 336     struct mapping *mapping = (struct mapping *)obj;
 337     return get_obj_fd( (struct object *)mapping->file );
 338 }
 339
 340 static void mapping_destroy( struct object *obj )
 341 {
 342     struct mapping *mapping = (struct mapping *)obj;
 343     assert( obj->ops == &mapping_ops );
 344     if (mapping->file) release_object( mapping->file );
 345     if (mapping->shared_file)
 346     {
 347         release_object( mapping->shared_file );
 348         list_remove( &mapping->shared_entry );
 349     }
 350 }
 351
 352 int get_page_size(void)
 353 {
 354     if (!page_mask) init_page_size();
 355     return page_mask + 1;
 356 }
 357
 358 /* create a file mapping */
 359 DECL_HANDLER(create_mapping)
 360 {
 361     struct object *obj;
 362     file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
 363
 364     reply->handle = 0;
 365     if ((obj = create_mapping( size, req->protect, req->file_handle,
 366                                get_req_data(), get_req_data_size() )))
 367     {
 368         reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
 369         release_object( obj );
 370     }
 371 }
 372
 373 /* open a handle to a mapping */
 374 DECL_HANDLER(open_mapping)
 375 {
 376     reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
 377                                  &mapping_ops, req->access, req->inherit );
 378 }
 379
 380 /* get a mapping information */
 381 DECL_HANDLER(get_mapping_info)
 382 {
 383     struct mapping *mapping;
 384
 385     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 386                                                      0, &mapping_ops )))
 387     {
 388         reply->size_high   = (unsigned int)(mapping->size >> 32);
 389         reply->size_low    = (unsigned int)mapping->size;
 390         reply->protect     = mapping->protect;
 391         reply->header_size = mapping->header_size;
 392         reply->base        = mapping->base;
 393         reply->shared_file = 0;
 394         reply->shared_size = mapping->shared_size;
 395         if (mapping->shared_file)
 396             reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 397                                                GENERIC_READ|GENERIC_WRITE, 0 );
 398         release_object( mapping );
 399     }
 400 }