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 /* return the size of the memory mapping of a given section */
 120 static inline unsigned int get_section_map_size( const IMAGE_SECTION_HEADER *sec )
 121 {
 122     if (!sec->Misc.VirtualSize) return ROUND_SIZE( sec->SizeOfRawData );
 123     else return ROUND_SIZE( sec->Misc.VirtualSize );
 124 }
 125
 126 /* return the size of the file mapping of a given section */
 127 static inline unsigned int get_section_filemap_size( const IMAGE_SECTION_HEADER *sec )
 128 {
 129     if (!sec->Misc.VirtualSize) return sec->SizeOfRawData;
 130     else return min( sec->SizeOfRawData, ROUND_SIZE( sec->Misc.VirtualSize ) );
 131 }
 132
 133 /* allocate and fill the temp file for a shared PE image mapping */
 134 static int build_shared_mapping( struct mapping *mapping, int fd,
 135                                  IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
 136 {
 137     unsigned int i, size, max_size, total_size;
 138     off_t shared_pos, read_pos, write_pos;
 139     char *buffer = NULL;
 140     int shared_fd;
 141     long toread;
 142
 143     /* compute the total size of the shared mapping */
 144
 145     total_size = max_size = 0;
 146     for (i = 0; i < nb_sec; i++)
 147     {
 148         if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
 149             (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
 150         {
 151             size = get_section_filemap_size( &sec[i] );
 152             if (size > max_size) max_size = size;
 153             total_size += get_section_map_size( &sec[i] );
 154         }
 155     }
 156     if (!(mapping->shared_size = total_size)) return 1;  /* nothing to do */
 157
 158     if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
 159
 160     /* create a temp file for the mapping */
 161
 162     if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
 163     if (!grow_file( mapping->shared_file, total_size )) goto error;
 164     if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
 165
 166     if (!(buffer = malloc( max_size ))) goto error;
 167
 168     /* copy the shared sections data into the temp file */
 169
 170     shared_pos = 0;
 171     for (i = 0; i < nb_sec; i++)
 172     {
 173         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
 174         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
 175         write_pos = shared_pos;
 176         shared_pos += get_section_map_size( &sec[i] );
 177         read_pos = sec[i].PointerToRawData;
 178         size = get_section_filemap_size( &sec[i] );
 179         if (!read_pos || !size) continue;
 180         toread = size;
 181         while (toread)
 182         {
 183             long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
 184             if (res <= 0) goto error;
 185             toread -= res;
 186             read_pos += res;
 187         }
 188         if (pwrite( shared_fd, buffer, size, write_pos ) != size) goto error;
 189     }
 190     free( buffer );
 191     return 1;
 192
 193  error:
 194     release_object( mapping->shared_file );
 195     mapping->shared_file = NULL;
 196     if (buffer) free( buffer );
 197     return 0;
 198 }
 199
 200 /* retrieve the mapping parameters for an executable (PE) image */
 201 static int get_image_params( struct mapping *mapping )
 202 {
 203     IMAGE_DOS_HEADER dos;
 204     IMAGE_NT_HEADERS nt;
 205     IMAGE_SECTION_HEADER *sec = NULL;
 206     struct fd *fd;
 207     off_t pos;
 208     int unix_fd, size;
 209
 210     /* load the headers */
 211
 212     if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
 213     if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
 214     if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
 215     if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
 216     pos = dos.e_lfanew;
 217
 218     if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
 219         goto error;
 220     pos += sizeof(nt.Signature);
 221     if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
 222     if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
 223         goto error;
 224     pos += sizeof(nt.FileHeader);
 225     /* zero out Optional header in the case it's not present or partial */
 226     memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
 227     if (pread( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader,
 228                pos ) != nt.FileHeader.SizeOfOptionalHeader) goto error;
 229     pos += nt.FileHeader.SizeOfOptionalHeader;
 230
 231     /* load the section headers */
 232
 233     size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
 234     if (!(sec = malloc( size ))) goto error;
 235     if (pread( unix_fd, sec, size, pos ) != size) goto error;
 236
 237     if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
 238
 239     if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
 240
 241     mapping->size        = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
 242     mapping->base        = (void *)nt.OptionalHeader.ImageBase;
 243     mapping->header_size = ROUND_SIZE_MASK( mapping->base, nt.OptionalHeader.SizeOfHeaders,
 244                                             nt.OptionalHeader.SectionAlignment - 1 );
 245     mapping->protect     = VPROT_IMAGE;
 246
 247     /* sanity check */
 248     if (mapping->header_size > mapping->size) goto error;
 249
 250     free( sec );
 251     release_object( fd );
 252     return 1;
 253
 254  error:
 255     if (sec) free( sec );
 256     release_object( fd );
 257     set_error( STATUS_INVALID_FILE_FOR_SECTION );
 258     return 0;
 259 }
 260
 261 /* get the size of the unix file associated with the mapping */
 262 inline static int get_file_size( struct file *file, file_pos_t *size )
 263 {
 264     struct stat st;
 265     int unix_fd = get_file_unix_fd( file );
 266
 267     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
 268     *size = st.st_size;
 269     return 1;
 270 }
 271
 272 static struct object *create_mapping( file_pos_t size, int protect, obj_handle_t handle,
 273                                       const WCHAR *name, size_t len )
 274 {
 275     struct mapping *mapping;
 276     int access = 0;
 277
 278     if (!page_mask) init_page_size();
 279
 280     if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, len )))
 281         return NULL;
 282     if (get_error() == STATUS_OBJECT_NAME_COLLISION)
 283         return &mapping->obj;  /* Nothing else to do */
 284
 285     mapping->header_size = 0;
 286     mapping->base        = NULL;
 287     mapping->shared_file = NULL;
 288     mapping->shared_size = 0;
 289
 290     if (protect & VPROT_READ) access |= GENERIC_READ;
 291     if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
 292
 293     if (handle)
 294     {
 295         if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
 296         if (protect & VPROT_IMAGE)
 297         {
 298             if (!get_image_params( mapping )) goto error;
 299             return &mapping->obj;
 300         }
 301         if (!size)
 302         {
 303             if (!get_file_size( mapping->file, &size )) goto error;
 304             if (!size)
 305             {
 306                 set_error( STATUS_FILE_INVALID );
 307                 goto error;
 308             }
 309         }
 310         else
 311         {
 312             if (!grow_file( mapping->file, size )) goto error;
 313         }
 314     }
 315     else  /* Anonymous mapping (no associated file) */
 316     {
 317         if (!size || (protect & VPROT_IMAGE))
 318         {
 319             set_error( STATUS_INVALID_PARAMETER );
 320             mapping->file = NULL;
 321             goto error;
 322         }
 323         if (!(mapping->file = create_temp_file( access ))) goto error;
 324         if (!grow_file( mapping->file, size )) goto error;
 325     }
 326     mapping->size    = (size + page_mask) & ~((file_pos_t)page_mask);
 327     mapping->protect = protect;
 328     return &mapping->obj;
 329
 330  error:
 331     release_object( mapping );
 332     return NULL;
 333 }
 334
 335 static void mapping_dump( struct object *obj, int verbose )
 336 {
 337     struct mapping *mapping = (struct mapping *)obj;
 338     assert( obj->ops == &mapping_ops );
 339     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
 340              "shared_file=%p shared_size=%08x ",
 341              (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
 342              mapping->protect, mapping->file, mapping->header_size,
 343              mapping->base, mapping->shared_file, mapping->shared_size );
 344     dump_object_name( &mapping->obj );
 345     fputc( '\n', stderr );
 346 }
 347
 348 static struct fd *mapping_get_fd( struct object *obj )
 349 {
 350     struct mapping *mapping = (struct mapping *)obj;
 351     return get_obj_fd( (struct object *)mapping->file );
 352 }
 353
 354 static void mapping_destroy( struct object *obj )
 355 {
 356     struct mapping *mapping = (struct mapping *)obj;
 357     assert( obj->ops == &mapping_ops );
 358     if (mapping->file) release_object( mapping->file );
 359     if (mapping->shared_file)
 360     {
 361         release_object( mapping->shared_file );
 362         list_remove( &mapping->shared_entry );
 363     }
 364 }
 365
 366 int get_page_size(void)
 367 {
 368     if (!page_mask) init_page_size();
 369     return page_mask + 1;
 370 }
 371
 372 /* create a file mapping */
 373 DECL_HANDLER(create_mapping)
 374 {
 375     struct object *obj;
 376     file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
 377
 378     reply->handle = 0;
 379     if ((obj = create_mapping( size, req->protect, req->file_handle,
 380                                get_req_data(), get_req_data_size() )))
 381     {
 382         reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
 383         release_object( obj );
 384     }
 385 }
 386
 387 /* open a handle to a mapping */
 388 DECL_HANDLER(open_mapping)
 389 {
 390     reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
 391                                  &mapping_ops, req->access, req->inherit );
 392 }
 393
 394 /* get a mapping information */
 395 DECL_HANDLER(get_mapping_info)
 396 {
 397     struct mapping *mapping;
 398
 399     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 400                                                      0, &mapping_ops )))
 401     {
 402         reply->size_high   = (unsigned int)(mapping->size >> 32);
 403         reply->size_low    = (unsigned int)mapping->size;
 404         reply->protect     = mapping->protect;
 405         reply->header_size = mapping->header_size;
 406         reply->base        = mapping->base;
 407         reply->shared_file = 0;
 408         reply->shared_size = mapping->shared_size;
 409         if (mapping->shared_file)
 410             reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 411                                                GENERIC_READ|GENERIC_WRITE, 0 );
 412         release_object( mapping );
 413     }
 414 }