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 "winbase.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     int             size_high;       /* mapping size */
  43     int             size_low;        /* mapping size */
  44     int             protect;         /* protection flags */
  45     struct file    *file;            /* file mapped */
  46     int             header_size;     /* size of headers (for PE image mapping) */
  47     void           *base;            /* default base addr (for PE image mapping) */
  48     struct file    *shared_file;     /* temp file for shared PE mapping */
  49     int             shared_size;     /* shared mapping total size */
  50     struct mapping *shared_next;     /* next in shared PE mapping list */
  51     struct mapping *shared_prev;     /* prev in shared PE mapping 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 void mapping_destroy( struct object *obj );
  57
  58 static const struct object_ops mapping_ops =
  59 {
  60     sizeof(struct mapping),      /* size */
  61     mapping_dump,                /* dump */
  62     no_add_queue,                /* add_queue */
  63     NULL,                        /* remove_queue */
  64     NULL,                        /* signaled */
  65     NULL,                        /* satisfied */
  66     mapping_get_fd,              /* get_fd */
  67     mapping_destroy              /* destroy */
  68 };
  69
  70 static struct mapping *shared_first;
  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_ADDR(addr) \
 104    ((int)(addr) & ~page_mask)
 105
 106 #define ROUND_SIZE(addr,size) \
 107    (((int)(size) + ((int)(addr) & page_mask) + 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     for (ptr = shared_first; ptr; ptr = ptr->shared_next)
 116         if (is_same_file( ptr->file, mapping->file ))
 117             return (struct file *)grab_object( ptr->shared_file );
 118     return NULL;
 119 }
 120
 121 /* allocate and fill the temp file for a shared PE image mapping */
 122 static int build_shared_mapping( struct mapping *mapping, int fd,
 123                                  IMAGE_SECTION_HEADER *sec, int nb_sec )
 124 {
 125     int i, max_size, total_size, pos;
 126     char *buffer = NULL;
 127     int shared_fd;
 128     long toread;
 129
 130     /* compute the total size of the shared mapping */
 131
 132     total_size = max_size = 0;
 133     for (i = 0; i < nb_sec; i++)
 134     {
 135         if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
 136             (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
 137         {
 138             int size = ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
 139             if (size > max_size) max_size = size;
 140             total_size += size;
 141         }
 142     }
 143     if (!(mapping->shared_size = total_size)) return 1;  /* nothing to do */
 144
 145     if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
 146
 147     /* create a temp file for the mapping */
 148
 149     if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
 150     if (!grow_file( mapping->shared_file, 0, total_size )) goto error;
 151     if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
 152
 153     if (!(buffer = malloc( max_size ))) goto error;
 154
 155     /* copy the shared sections data into the temp file */
 156
 157     for (i = pos = 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         if (lseek( shared_fd, pos, SEEK_SET ) != pos) goto error;
 162         pos += ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
 163         if ((sec[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) &&
 164             !(sec[i].Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)) continue;
 165         if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
 166         if (lseek( fd, sec[i].PointerToRawData, SEEK_SET ) != sec[i].PointerToRawData) goto error;
 167         toread = sec[i].SizeOfRawData;
 168         while (toread)
 169         {
 170             long res = read( fd, buffer + sec[i].SizeOfRawData - toread, toread );
 171             if (res <= 0) goto error;
 172             toread -= res;
 173         }
 174         if (write( shared_fd, buffer, sec[i].SizeOfRawData ) != sec[i].SizeOfRawData) 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     int unix_fd, filepos, size;
 194
 195     /* load the headers */
 196
 197     if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
 198     unix_fd = get_unix_fd( fd );
 199     filepos = lseek( unix_fd, 0, SEEK_SET );
 200     if (read( unix_fd, &dos, sizeof(dos) ) != sizeof(dos)) goto error;
 201     if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
 202     if (lseek( unix_fd, dos.e_lfanew, SEEK_SET ) == -1) goto error;
 203
 204     if (read( unix_fd, &nt.Signature, sizeof(nt.Signature) ) != sizeof(nt.Signature)) goto error;
 205     if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
 206     if (read( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader) ) != sizeof(nt.FileHeader)) goto error;
 207     /* zero out Optional header in the case it's not present or partial */
 208     memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
 209     if (read( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader) != nt.FileHeader.SizeOfOptionalHeader) goto error;
 210
 211     /* load the section headers */
 212
 213     size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
 214     if (!(sec = malloc( size ))) goto error;
 215     if (read( unix_fd, sec, size ) != size) goto error;
 216
 217     if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
 218
 219     if (mapping->shared_file)  /* link it in the list */
 220     {
 221         if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
 222         mapping->shared_prev = NULL;
 223         shared_first = mapping;
 224     }
 225
 226     mapping->size_low    = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
 227     mapping->size_high   = 0;
 228     mapping->base        = (void *)nt.OptionalHeader.ImageBase;
 229     mapping->header_size = ROUND_SIZE( mapping->base, nt.OptionalHeader.SizeOfHeaders );
 230     mapping->protect     = VPROT_IMAGE;
 231
 232     /* sanity check */
 233     if (mapping->header_size > mapping->size_low) goto error;
 234
 235     lseek( unix_fd, filepos, SEEK_SET );
 236     free( sec );
 237     release_object( fd );
 238     return 1;
 239
 240  error:
 241     lseek( unix_fd, filepos, SEEK_SET );
 242     if (sec) free( sec );
 243     release_object( fd );
 244     set_error( STATUS_INVALID_FILE_FOR_SECTION );
 245     return 0;
 246 }
 247
 248 /* get the size of the unix file associated with the mapping */
 249 inline static int get_file_size( struct file *file, int *size_high, int *size_low )
 250 {
 251     struct stat st;
 252     int unix_fd = get_file_unix_fd( file );
 253
 254     if (fstat( unix_fd, &st ) == -1) return 0;
 255     *size_high = st.st_size >> 32;
 256     *size_low  = st.st_size & 0xffffffff;
 257     return 1;
 258 }
 259
 260 static struct object *create_mapping( int size_high, int size_low, int protect,
 261                                       obj_handle_t handle, const WCHAR *name, size_t len )
 262 {
 263     struct mapping *mapping;
 264     int access = 0;
 265
 266     if (!page_mask) init_page_size();
 267
 268     if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, len )))
 269         return NULL;
 270     if (get_error() == STATUS_OBJECT_NAME_COLLISION)
 271         return &mapping->obj;  /* Nothing else to do */
 272
 273     mapping->header_size = 0;
 274     mapping->base        = NULL;
 275     mapping->shared_file = NULL;
 276     mapping->shared_size = 0;
 277
 278     if (protect & VPROT_READ) access |= GENERIC_READ;
 279     if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
 280
 281     if (handle)
 282     {
 283         if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
 284         if (protect & VPROT_IMAGE)
 285         {
 286             if (!get_image_params( mapping )) goto error;
 287             return &mapping->obj;
 288         }
 289         if (!size_high && !size_low)
 290         {
 291             if (!get_file_size( mapping->file, &size_high, &size_low )) goto error;
 292             if (!size_high && !size_low)
 293             {
 294                 set_error( STATUS_FILE_INVALID );
 295                 goto error;
 296             }
 297         }
 298         else
 299         {
 300             if (!grow_file( mapping->file, size_high, size_low )) goto error;
 301         }
 302     }
 303     else  /* Anonymous mapping (no associated file) */
 304     {
 305         if ((!size_high && !size_low) || (protect & VPROT_IMAGE))
 306         {
 307             set_error( STATUS_INVALID_PARAMETER );
 308             mapping->file = NULL;
 309             goto error;
 310         }
 311         if (!(mapping->file = create_temp_file( access ))) goto error;
 312         if (!grow_file( mapping->file, size_high, size_low )) goto error;
 313     }
 314     mapping->size_high = size_high;
 315     mapping->size_low  = ROUND_SIZE( 0, size_low );
 316     mapping->protect   = protect;
 317     return &mapping->obj;
 318
 319  error:
 320     release_object( mapping );
 321     return NULL;
 322 }
 323
 324 static void mapping_dump( struct object *obj, int verbose )
 325 {
 326     struct mapping *mapping = (struct mapping *)obj;
 327     assert( obj->ops == &mapping_ops );
 328     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
 329              "shared_file=%p shared_size=%08x ",
 330              mapping->size_high, mapping->size_low, mapping->protect, mapping->file,
 331              mapping->header_size, mapping->base, mapping->shared_file, mapping->shared_size );
 332     dump_object_name( &mapping->obj );
 333     fputc( '\n', stderr );
 334 }
 335
 336 static struct fd *mapping_get_fd( struct object *obj )
 337 {
 338     struct mapping *mapping = (struct mapping *)obj;
 339     return get_obj_fd( (struct object *)mapping->file );
 340 }
 341
 342 static void mapping_destroy( struct object *obj )
 343 {
 344     struct mapping *mapping = (struct mapping *)obj;
 345     assert( obj->ops == &mapping_ops );
 346     if (mapping->file) release_object( mapping->file );
 347     if (mapping->shared_file)
 348     {
 349         release_object( mapping->shared_file );
 350         if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
 351         if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
 352         else shared_first = mapping->shared_next;
 353     }
 354 }
 355
 356 int get_page_size(void)
 357 {
 358     if (!page_mask) init_page_size();
 359     return page_mask + 1;
 360 }
 361
 362 /* create a file mapping */
 363 DECL_HANDLER(create_mapping)
 364 {
 365     struct object *obj;
 366
 367     reply->handle = 0;
 368     if ((obj = create_mapping( req->size_high, req->size_low,
 369                                req->protect, req->file_handle,
 370                                get_req_data(), get_req_data_size() )))
 371     {
 372         reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
 373         release_object( obj );
 374     }
 375 }
 376
 377 /* open a handle to a mapping */
 378 DECL_HANDLER(open_mapping)
 379 {
 380     reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
 381                                  &mapping_ops, req->access, req->inherit );
 382 }
 383
 384 /* get a mapping information */
 385 DECL_HANDLER(get_mapping_info)
 386 {
 387     struct mapping *mapping;
 388
 389     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 390                                                      0, &mapping_ops )))
 391     {
 392         reply->size_high   = mapping->size_high;
 393         reply->size_low    = mapping->size_low;
 394         reply->protect     = mapping->protect;
 395         reply->header_size = mapping->header_size;
 396         reply->base        = mapping->base;
 397         reply->shared_file = 0;
 398         reply->shared_size = mapping->shared_size;
 399         reply->removable   = is_file_removable( mapping->file );
 400         if (mapping->shared_file)
 401             reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 402                                                GENERIC_READ|GENERIC_WRITE, 0 );
 403         release_object( mapping );
 404     }
 405 }