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) continue;
 162         if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
 163         if (lseek( fd, sec[i].PointerToRawData, SEEK_SET ) != sec[i].PointerToRawData) goto error;
 164         toread = sec[i].SizeOfRawData;
 165         while (toread)
 166         {
 167             long res = read( fd, buffer + sec[i].SizeOfRawData - toread, toread );
 168             if (res <= 0) goto error;
 169             toread -= res;
 170         }
 171         if (write( shared_fd, buffer, sec[i].SizeOfRawData ) != sec[i].SizeOfRawData) goto error;
 172     }
 173     free( buffer );
 174     return 1;
 175
 176  error:
 177     release_object( mapping->shared_file );
 178     mapping->shared_file = NULL;
 179     if (buffer) free( buffer );
 180     return 0;
 181 }
 182
 183 /* retrieve the mapping parameters for an executable (PE) image */
 184 static int get_image_params( struct mapping *mapping )
 185 {
 186     IMAGE_DOS_HEADER dos;
 187     IMAGE_NT_HEADERS nt;
 188     IMAGE_SECTION_HEADER *sec = NULL;
 189     struct fd *fd;
 190     int unix_fd, filepos, size;
 191
 192     /* load the headers */
 193
 194     if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
 195     unix_fd = get_unix_fd( fd );
 196     filepos = lseek( unix_fd, 0, SEEK_SET );
 197     if (read( unix_fd, &dos, sizeof(dos) ) != sizeof(dos)) goto error;
 198     if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
 199     if (lseek( unix_fd, dos.e_lfanew, SEEK_SET ) == -1) goto error;
 200
 201     if (read( unix_fd, &nt.Signature, sizeof(nt.Signature) ) != sizeof(nt.Signature)) goto error;
 202     if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
 203     if (read( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader) ) != sizeof(nt.FileHeader)) goto error;
 204     /* zero out Optional header in the case it's not present or partial */
 205     memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
 206     if (read( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader) != nt.FileHeader.SizeOfOptionalHeader) goto error;
 207
 208     /* load the section headers */
 209
 210     size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
 211     if (!(sec = malloc( size ))) goto error;
 212     if (read( unix_fd, sec, size ) != size) goto error;
 213
 214     if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
 215
 216     if (mapping->shared_file)  /* link it in the list */
 217     {
 218         if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
 219         mapping->shared_prev = NULL;
 220         shared_first = mapping;
 221     }
 222
 223     mapping->size_low    = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
 224     mapping->size_high   = 0;
 225     mapping->base        = (void *)nt.OptionalHeader.ImageBase;
 226     mapping->header_size = ROUND_SIZE( mapping->base, nt.OptionalHeader.SizeOfHeaders );
 227     mapping->protect     = VPROT_IMAGE;
 228
 229     /* sanity check */
 230     if (mapping->header_size > mapping->size_low) goto error;
 231
 232     lseek( unix_fd, filepos, SEEK_SET );
 233     free( sec );
 234     release_object( fd );
 235     return 1;
 236
 237  error:
 238     lseek( unix_fd, filepos, SEEK_SET );
 239     if (sec) free( sec );
 240     release_object( fd );
 241     set_error( STATUS_INVALID_FILE_FOR_SECTION );
 242     return 0;
 243 }
 244
 245 /* get the size of the unix file associated with the mapping */
 246 inline static int get_file_size( struct file *file, int *size_high, int *size_low )
 247 {
 248     struct stat st;
 249     int unix_fd = get_file_unix_fd( file );
 250
 251     if (fstat( unix_fd, &st ) == -1) return 0;
 252     *size_high = st.st_size >> 32;
 253     *size_low  = st.st_size & 0xffffffff;
 254     return 1;
 255 }
 256
 257 static struct object *create_mapping( int size_high, int size_low, int protect,
 258                                       obj_handle_t handle, const WCHAR *name, size_t len )
 259 {
 260     struct mapping *mapping;
 261     int access = 0;
 262
 263     if (!page_mask) init_page_size();
 264
 265     if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, len )))
 266         return NULL;
 267     if (get_error() == STATUS_OBJECT_NAME_COLLISION)
 268         return &mapping->obj;  /* Nothing else to do */
 269
 270     mapping->header_size = 0;
 271     mapping->base        = NULL;
 272     mapping->shared_file = NULL;
 273     mapping->shared_size = 0;
 274
 275     if (protect & VPROT_READ) access |= GENERIC_READ;
 276     if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
 277
 278     if (handle)
 279     {
 280         if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
 281         if (protect & VPROT_IMAGE)
 282         {
 283             if (!get_image_params( mapping )) goto error;
 284             return &mapping->obj;
 285         }
 286         if (!size_high && !size_low)
 287         {
 288             if (!get_file_size( mapping->file, &size_high, &size_low )) goto error;
 289         }
 290         else
 291         {
 292             if (!grow_file( mapping->file, size_high, size_low )) goto error;
 293         }
 294     }
 295     else  /* Anonymous mapping (no associated file) */
 296     {
 297         if ((!size_high && !size_low) || (protect & VPROT_IMAGE))
 298         {
 299             set_error( STATUS_INVALID_PARAMETER );
 300             mapping->file = NULL;
 301             goto error;
 302         }
 303         if (!(mapping->file = create_temp_file( access ))) goto error;
 304         if (!grow_file( mapping->file, size_high, size_low )) goto error;
 305     }
 306     mapping->size_high = size_high;
 307     mapping->size_low  = ROUND_SIZE( 0, size_low );
 308     mapping->protect   = protect;
 309     return &mapping->obj;
 310
 311  error:
 312     release_object( mapping );
 313     return NULL;
 314 }
 315
 316 static void mapping_dump( struct object *obj, int verbose )
 317 {
 318     struct mapping *mapping = (struct mapping *)obj;
 319     assert( obj->ops == &mapping_ops );
 320     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
 321              "shared_file=%p shared_size=%08x ",
 322              mapping->size_high, mapping->size_low, mapping->protect, mapping->file,
 323              mapping->header_size, mapping->base, mapping->shared_file, mapping->shared_size );
 324     dump_object_name( &mapping->obj );
 325     fputc( '\n', stderr );
 326 }
 327
 328 static struct fd *mapping_get_fd( struct object *obj )
 329 {
 330     struct mapping *mapping = (struct mapping *)obj;
 331     return get_obj_fd( (struct object *)mapping->file );
 332 }
 333
 334 static void mapping_destroy( struct object *obj )
 335 {
 336     struct mapping *mapping = (struct mapping *)obj;
 337     assert( obj->ops == &mapping_ops );
 338     if (mapping->file) release_object( mapping->file );
 339     if (mapping->shared_file)
 340     {
 341         release_object( mapping->shared_file );
 342         if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
 343         if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
 344         else shared_first = mapping->shared_next;
 345     }
 346 }
 347
 348 int get_page_size(void)
 349 {
 350     if (!page_mask) init_page_size();
 351     return page_mask + 1;
 352 }
 353
 354 /* create a file mapping */
 355 DECL_HANDLER(create_mapping)
 356 {
 357     struct object *obj;
 358
 359     reply->handle = 0;
 360     if ((obj = create_mapping( req->size_high, req->size_low,
 361                                req->protect, req->file_handle,
 362                                get_req_data(), get_req_data_size() )))
 363     {
 364         reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
 365         release_object( obj );
 366     }
 367 }
 368
 369 /* open a handle to a mapping */
 370 DECL_HANDLER(open_mapping)
 371 {
 372     reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
 373                                  &mapping_ops, req->access, req->inherit );
 374 }
 375
 376 /* get a mapping information */
 377 DECL_HANDLER(get_mapping_info)
 378 {
 379     struct mapping *mapping;
 380
 381     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 382                                                      0, &mapping_ops )))
 383     {
 384         reply->size_high   = mapping->size_high;
 385         reply->size_low    = mapping->size_low;
 386         reply->protect     = mapping->protect;
 387         reply->header_size = mapping->header_size;
 388         reply->base        = mapping->base;
 389         reply->shared_file = 0;
 390         reply->shared_size = mapping->shared_size;
 391         reply->drive_type  = get_file_drive_type( mapping->file );
 392         if (mapping->shared_file)
 393             reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 394                                                GENERIC_READ|GENERIC_WRITE, 0 );
 395         release_object( mapping );
 396     }
 397 }