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;
 126     off_t shared_pos, read_pos, write_pos;
 127     char *buffer = NULL;
 128     int shared_fd;
 129     long toread;
 130
 131     /* compute the total size of the shared mapping */
 132
 133     total_size = max_size = 0;
 134     for (i = 0; i < nb_sec; i++)
 135     {
 136         if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
 137             (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
 138         {
 139             int size = ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
 140             if (size > max_size) max_size = size;
 141             total_size += size;
 142         }
 143     }
 144     if (!(mapping->shared_size = total_size)) return 1;  /* nothing to do */
 145
 146     if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
 147
 148     /* create a temp file for the mapping */
 149
 150     if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
 151     if (!grow_file( mapping->shared_file, 0, total_size )) goto error;
 152     if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
 153
 154     if (!(buffer = malloc( max_size ))) goto error;
 155
 156     /* copy the shared sections data into the temp file */
 157
 158     shared_pos = 0;
 159     for (i = 0; i < nb_sec; i++)
 160     {
 161         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
 162         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
 163         write_pos = shared_pos;
 164         shared_pos += ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
 165         if ((sec[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) &&
 166             !(sec[i].Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)) continue;
 167         if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
 168         read_pos = sec[i].PointerToRawData;
 169         toread = sec[i].SizeOfRawData;
 170         while (toread)
 171         {
 172             long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
 173             if (res <= 0) goto error;
 174             toread -= res;
 175             read_pos += res;
 176         }
 177         if (pwrite( shared_fd, buffer, sec[i].SizeOfRawData, write_pos ) != sec[i].SizeOfRawData)
 178             goto error;
 179     }
 180     free( buffer );
 181     return 1;
 182
 183  error:
 184     release_object( mapping->shared_file );
 185     mapping->shared_file = NULL;
 186     if (buffer) free( buffer );
 187     return 0;
 188 }
 189
 190 /* retrieve the mapping parameters for an executable (PE) image */
 191 static int get_image_params( struct mapping *mapping )
 192 {
 193     IMAGE_DOS_HEADER dos;
 194     IMAGE_NT_HEADERS nt;
 195     IMAGE_SECTION_HEADER *sec = NULL;
 196     struct fd *fd;
 197     off_t pos;
 198     int unix_fd, size;
 199
 200     /* load the headers */
 201
 202     if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
 203     unix_fd = get_unix_fd( fd );
 204     if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
 205     if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
 206     pos = dos.e_lfanew;
 207
 208     if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
 209         goto error;
 210     pos += sizeof(nt.Signature);
 211     if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
 212     if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
 213         goto error;
 214     pos += sizeof(nt.FileHeader);
 215     /* zero out Optional header in the case it's not present or partial */
 216     memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
 217     if (pread( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader,
 218                pos ) != nt.FileHeader.SizeOfOptionalHeader) goto error;
 219     pos += nt.FileHeader.SizeOfOptionalHeader;
 220
 221     /* load the section headers */
 222
 223     size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
 224     if (!(sec = malloc( size ))) goto error;
 225     if (pread( unix_fd, sec, size, pos ) != size) goto error;
 226
 227     if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
 228
 229     if (mapping->shared_file)  /* link it in the list */
 230     {
 231         if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
 232         mapping->shared_prev = NULL;
 233         shared_first = mapping;
 234     }
 235
 236     mapping->size_low    = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
 237     mapping->size_high   = 0;
 238     mapping->base        = (void *)nt.OptionalHeader.ImageBase;
 239     mapping->header_size = ROUND_SIZE( mapping->base, nt.OptionalHeader.SizeOfHeaders );
 240     mapping->protect     = VPROT_IMAGE;
 241
 242     /* sanity check */
 243     if (mapping->header_size > mapping->size_low) goto error;
 244
 245     free( sec );
 246     release_object( fd );
 247     return 1;
 248
 249  error:
 250     if (sec) free( sec );
 251     release_object( fd );
 252     set_error( STATUS_INVALID_FILE_FOR_SECTION );
 253     return 0;
 254 }
 255
 256 /* get the size of the unix file associated with the mapping */
 257 inline static int get_file_size( struct file *file, int *size_high, int *size_low )
 258 {
 259     struct stat st;
 260     int unix_fd = get_file_unix_fd( file );
 261
 262     if (fstat( unix_fd, &st ) == -1) return 0;
 263     *size_high = st.st_size >> 32;
 264     *size_low  = st.st_size & 0xffffffff;
 265     return 1;
 266 }
 267
 268 static struct object *create_mapping( int size_high, int size_low, int protect,
 269                                       obj_handle_t handle, const WCHAR *name, size_t len )
 270 {
 271     struct mapping *mapping;
 272     int access = 0;
 273
 274     if (!page_mask) init_page_size();
 275
 276     if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, len )))
 277         return NULL;
 278     if (get_error() == STATUS_OBJECT_NAME_COLLISION)
 279         return &mapping->obj;  /* Nothing else to do */
 280
 281     mapping->header_size = 0;
 282     mapping->base        = NULL;
 283     mapping->shared_file = NULL;
 284     mapping->shared_size = 0;
 285
 286     if (protect & VPROT_READ) access |= GENERIC_READ;
 287     if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
 288
 289     if (handle)
 290     {
 291         if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
 292         if (protect & VPROT_IMAGE)
 293         {
 294             if (!get_image_params( mapping )) goto error;
 295             return &mapping->obj;
 296         }
 297         if (!size_high && !size_low)
 298         {
 299             if (!get_file_size( mapping->file, &size_high, &size_low )) goto error;
 300             if (!size_high && !size_low)
 301             {
 302                 set_error( STATUS_FILE_INVALID );
 303                 goto error;
 304             }
 305         }
 306         else
 307         {
 308             if (!grow_file( mapping->file, size_high, size_low )) goto error;
 309         }
 310     }
 311     else  /* Anonymous mapping (no associated file) */
 312     {
 313         if ((!size_high && !size_low) || (protect & VPROT_IMAGE))
 314         {
 315             set_error( STATUS_INVALID_PARAMETER );
 316             mapping->file = NULL;
 317             goto error;
 318         }
 319         if (!(mapping->file = create_temp_file( access ))) goto error;
 320         if (!grow_file( mapping->file, size_high, size_low )) goto error;
 321     }
 322     mapping->size_high = size_high;
 323     mapping->size_low  = ROUND_SIZE( 0, size_low );
 324     mapping->protect   = protect;
 325     return &mapping->obj;
 326
 327  error:
 328     release_object( mapping );
 329     return NULL;
 330 }
 331
 332 static void mapping_dump( struct object *obj, int verbose )
 333 {
 334     struct mapping *mapping = (struct mapping *)obj;
 335     assert( obj->ops == &mapping_ops );
 336     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
 337              "shared_file=%p shared_size=%08x ",
 338              mapping->size_high, mapping->size_low, mapping->protect, mapping->file,
 339              mapping->header_size, mapping->base, mapping->shared_file, mapping->shared_size );
 340     dump_object_name( &mapping->obj );
 341     fputc( '\n', stderr );
 342 }
 343
 344 static struct fd *mapping_get_fd( struct object *obj )
 345 {
 346     struct mapping *mapping = (struct mapping *)obj;
 347     return get_obj_fd( (struct object *)mapping->file );
 348 }
 349
 350 static void mapping_destroy( struct object *obj )
 351 {
 352     struct mapping *mapping = (struct mapping *)obj;
 353     assert( obj->ops == &mapping_ops );
 354     if (mapping->file) release_object( mapping->file );
 355     if (mapping->shared_file)
 356     {
 357         release_object( mapping->shared_file );
 358         if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
 359         if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
 360         else shared_first = mapping->shared_next;
 361     }
 362 }
 363
 364 int get_page_size(void)
 365 {
 366     if (!page_mask) init_page_size();
 367     return page_mask + 1;
 368 }
 369
 370 /* create a file mapping */
 371 DECL_HANDLER(create_mapping)
 372 {
 373     struct object *obj;
 374
 375     reply->handle = 0;
 376     if ((obj = create_mapping( req->size_high, req->size_low,
 377                                req->protect, req->file_handle,
 378                                get_req_data(), get_req_data_size() )))
 379     {
 380         reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
 381         release_object( obj );
 382     }
 383 }
 384
 385 /* open a handle to a mapping */
 386 DECL_HANDLER(open_mapping)
 387 {
 388     reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
 389                                  &mapping_ops, req->access, req->inherit );
 390 }
 391
 392 /* get a mapping information */
 393 DECL_HANDLER(get_mapping_info)
 394 {
 395     struct mapping *mapping;
 396
 397     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 398                                                      0, &mapping_ops )))
 399     {
 400         reply->size_high   = mapping->size_high;
 401         reply->size_low    = mapping->size_low;
 402         reply->protect     = mapping->protect;
 403         reply->header_size = mapping->header_size;
 404         reply->base        = mapping->base;
 405         reply->shared_file = 0;
 406         reply->shared_size = mapping->shared_size;
 407         if (mapping->shared_file)
 408             reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 409                                                GENERIC_READ|GENERIC_WRITE, 0 );
 410         release_object( mapping );
 411     }
 412 }