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 <stdio.h>
  26 #include <stdlib.h>
  27 #include <sys/stat.h>
  28 #include <unistd.h>
  29
  30 #include "winbase.h"
  31
  32 #include "file.h"
  33 #include "handle.h"
  34 #include "thread.h"
  35 #include "request.h"
  36
  37 struct mapping
  38 {
  39     struct object   obj;             /* object header */
  40     int             size_high;       /* mapping size */
  41     int             size_low;        /* 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 mapping *shared_next;     /* next in shared PE mapping list */
  49     struct mapping *shared_prev;     /* prev in shared PE mapping 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     mapping_get_fd,              /* get_fd */
  65     mapping_destroy              /* destroy */
  66 };
  67
  68 static struct mapping *shared_first;
  69
  70 #ifdef __i386__
  71
  72 /* These are always the same on an i386, and it will be faster this way */
  73 # define page_mask  0xfff
  74 # define page_shift 12
  75 # define init_page_size() do { /* nothing */ } while(0)
  76
  77 #else  /* __i386__ */
  78
  79 static int page_shift, page_mask;
  80
  81 static void init_page_size(void)
  82 {
  83     int page_size;
  84 # ifdef HAVE_GETPAGESIZE
  85     page_size = getpagesize();
  86 # else
  87 #  ifdef __svr4__
  88     page_size = sysconf(_SC_PAGESIZE);
  89 #  else
  90 #   error Cannot get the page size on this platform
  91 #  endif
  92 # endif
  93     page_mask = page_size - 1;
  94     /* Make sure we have a power of 2 */
  95     assert( !(page_size & page_mask) );
  96     page_shift = 0;
  97     while ((1 << page_shift) != page_size) page_shift++;
  98 }
  99 #endif  /* __i386__ */
 100
 101 #define ROUND_ADDR(addr) \
 102    ((int)(addr) & ~page_mask)
 103
 104 #define ROUND_SIZE(addr,size) \
 105    (((int)(size) + ((int)(addr) & page_mask) + 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     for (ptr = shared_first; ptr; ptr = ptr->shared_next)
 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, int nb_sec )
 122 {
 123     int i, max_size, total_size, pos;
 124     char *buffer = NULL;
 125     int shared_fd;
 126     long toread;
 127
 128     /* compute the total size of the shared mapping */
 129
 130     total_size = max_size = 0;
 131     for (i = 0; i < nb_sec; i++)
 132     {
 133         if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
 134             (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
 135         {
 136             int size = ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
 137             if (size > max_size) max_size = size;
 138             total_size += size;
 139         }
 140     }
 141     if (!(mapping->shared_size = total_size)) return 1;  /* nothing to do */
 142
 143     if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
 144
 145     /* create a temp file for the mapping */
 146
 147     if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
 148     if (!grow_file( mapping->shared_file, 0, total_size )) goto error;
 149     if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
 150
 151     if (!(buffer = malloc( max_size ))) goto error;
 152
 153     /* copy the shared sections data into the temp file */
 154
 155     for (i = pos = 0; i < nb_sec; i++)
 156     {
 157         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
 158         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
 159         if (lseek( shared_fd, pos, SEEK_SET ) != pos) goto error;
 160         pos += ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
 161         if ((sec[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) &&
 162             !(sec[i].Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)) continue;
 163         if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
 164         if (lseek( fd, sec[i].PointerToRawData, SEEK_SET ) != sec[i].PointerToRawData) goto error;
 165         toread = sec[i].SizeOfRawData;
 166         while (toread)
 167         {
 168             long res = read( fd, buffer + sec[i].SizeOfRawData - toread, toread );
 169             if (res <= 0) goto error;
 170             toread -= res;
 171         }
 172         if (write( shared_fd, buffer, sec[i].SizeOfRawData ) != sec[i].SizeOfRawData) goto error;
 173     }
 174     free( buffer );
 175     return 1;
 176
 177  error:
 178     release_object( mapping->shared_file );
 179     mapping->shared_file = NULL;
 180     if (buffer) free( buffer );
 181     return 0;
 182 }
 183
 184 /* retrieve the mapping parameters for an executable (PE) image */
 185 static int get_image_params( struct mapping *mapping )
 186 {
 187     IMAGE_DOS_HEADER dos;
 188     IMAGE_NT_HEADERS nt;
 189     IMAGE_SECTION_HEADER *sec = NULL;
 190     struct fd *fd;
 191     int unix_fd, filepos, size;
 192
 193     /* load the headers */
 194
 195     if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
 196     unix_fd = get_unix_fd( fd );
 197     filepos = lseek( unix_fd, 0, SEEK_SET );
 198     if (read( unix_fd, &dos, sizeof(dos) ) != sizeof(dos)) goto error;
 199     if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
 200     if (lseek( unix_fd, dos.e_lfanew, SEEK_SET ) == -1) goto error;
 201
 202     if (read( unix_fd, &nt.Signature, sizeof(nt.Signature) ) != sizeof(nt.Signature)) goto error;
 203     if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
 204     if (read( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader) ) != sizeof(nt.FileHeader)) goto error;
 205     /* zero out Optional header in the case it's not present or partial */
 206     memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
 207     if (read( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader) != nt.FileHeader.SizeOfOptionalHeader) goto error;
 208
 209     /* load the section headers */
 210
 211     size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
 212     if (!(sec = malloc( size ))) goto error;
 213     if (read( unix_fd, sec, size ) != size) goto error;
 214
 215     if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
 216
 217     if (mapping->shared_file)  /* link it in the list */
 218     {
 219         if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
 220         mapping->shared_prev = NULL;
 221         shared_first = mapping;
 222     }
 223
 224     mapping->size_low    = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
 225     mapping->size_high   = 0;
 226     mapping->base        = (void *)nt.OptionalHeader.ImageBase;
 227     mapping->header_size = ROUND_SIZE( mapping->base, nt.OptionalHeader.SizeOfHeaders );
 228     mapping->protect     = VPROT_IMAGE;
 229
 230     /* sanity check */
 231     if (mapping->header_size > mapping->size_low) goto error;
 232
 233     lseek( unix_fd, filepos, SEEK_SET );
 234     free( sec );
 235     release_object( fd );
 236     return 1;
 237
 238  error:
 239     lseek( unix_fd, filepos, SEEK_SET );
 240     if (sec) free( sec );
 241     release_object( fd );
 242     set_error( STATUS_INVALID_FILE_FOR_SECTION );
 243     return 0;
 244 }
 245
 246 /* get the size of the unix file associated with the mapping */
 247 inline static int get_file_size( struct file *file, int *size_high, int *size_low )
 248 {
 249     struct stat st;
 250     int unix_fd = get_file_unix_fd( file );
 251
 252     if (fstat( unix_fd, &st ) == -1) return 0;
 253     *size_high = st.st_size >> 32;
 254     *size_low  = st.st_size & 0xffffffff;
 255     return 1;
 256 }
 257
 258 static struct object *create_mapping( int size_high, int size_low, int protect,
 259                                       obj_handle_t handle, 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_high && !size_low)
 288         {
 289             if (!get_file_size( mapping->file, &size_high, &size_low )) goto error;
 290         }
 291         else
 292         {
 293             if (!grow_file( mapping->file, size_high, size_low )) goto error;
 294         }
 295     }
 296     else  /* Anonymous mapping (no associated file) */
 297     {
 298         if ((!size_high && !size_low) || (protect & VPROT_IMAGE))
 299         {
 300             set_error( STATUS_INVALID_PARAMETER );
 301             mapping->file = NULL;
 302             goto error;
 303         }
 304         if (!(mapping->file = create_temp_file( access ))) goto error;
 305         if (!grow_file( mapping->file, size_high, size_low )) goto error;
 306     }
 307     mapping->size_high = size_high;
 308     mapping->size_low  = ROUND_SIZE( 0, size_low );
 309     mapping->protect   = protect;
 310     return &mapping->obj;
 311
 312  error:
 313     release_object( mapping );
 314     return NULL;
 315 }
 316
 317 static void mapping_dump( struct object *obj, int verbose )
 318 {
 319     struct mapping *mapping = (struct mapping *)obj;
 320     assert( obj->ops == &mapping_ops );
 321     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
 322              "shared_file=%p shared_size=%08x ",
 323              mapping->size_high, mapping->size_low, mapping->protect, mapping->file,
 324              mapping->header_size, mapping->base, mapping->shared_file, mapping->shared_size );
 325     dump_object_name( &mapping->obj );
 326     fputc( '\n', stderr );
 327 }
 328
 329 static struct fd *mapping_get_fd( struct object *obj )
 330 {
 331     struct mapping *mapping = (struct mapping *)obj;
 332     return get_obj_fd( (struct object *)mapping->file );
 333 }
 334
 335 static void mapping_destroy( struct object *obj )
 336 {
 337     struct mapping *mapping = (struct mapping *)obj;
 338     assert( obj->ops == &mapping_ops );
 339     if (mapping->file) release_object( mapping->file );
 340     if (mapping->shared_file)
 341     {
 342         release_object( mapping->shared_file );
 343         if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
 344         if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
 345         else shared_first = mapping->shared_next;
 346     }
 347 }
 348
 349 int get_page_size(void)
 350 {
 351     if (!page_mask) init_page_size();
 352     return page_mask + 1;
 353 }
 354
 355 /* create a file mapping */
 356 DECL_HANDLER(create_mapping)
 357 {
 358     struct object *obj;
 359
 360     reply->handle = 0;
 361     if ((obj = create_mapping( req->size_high, req->size_low,
 362                                req->protect, req->file_handle,
 363                                get_req_data(), get_req_data_size() )))
 364     {
 365         reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
 366         release_object( obj );
 367     }
 368 }
 369
 370 /* open a handle to a mapping */
 371 DECL_HANDLER(open_mapping)
 372 {
 373     reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
 374                                  &mapping_ops, req->access, req->inherit );
 375 }
 376
 377 /* get a mapping information */
 378 DECL_HANDLER(get_mapping_info)
 379 {
 380     struct mapping *mapping;
 381
 382     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 383                                                      0, &mapping_ops )))
 384     {
 385         reply->size_high   = mapping->size_high;
 386         reply->size_low    = mapping->size_low;
 387         reply->protect     = mapping->protect;
 388         reply->header_size = mapping->header_size;
 389         reply->base        = mapping->base;
 390         reply->shared_file = 0;
 391         reply->shared_size = mapping->shared_size;
 392         reply->drive_type  = get_file_drive_type( mapping->file );
 393         if (mapping->shared_file)
 394             reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 395                                                GENERIC_READ|GENERIC_WRITE, 0 );
 396         release_object( mapping );
 397     }
 398 }