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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 "ntstatus.h"
  32 #define WIN32_NO_STATUS
  33 #include "windef.h"
  34 #include "winternl.h"
  35
  36 #include "file.h"
  37 #include "handle.h"
  38 #include "thread.h"
  39 #include "request.h"
  40
  41 struct mapping
  42 {
  43     struct object   obj;             /* object header */
  44     file_pos_t      size;            /* mapping size */
  45     int             protect;         /* protection flags */
  46     struct file    *file;            /* file mapped */
  47     int             header_size;     /* size of headers (for PE image mapping) */
  48     void           *base;            /* default base addr (for PE image mapping) */
  49     struct file    *shared_file;     /* temp file for shared PE mapping */
  50     int             shared_size;     /* shared mapping total size */
  51     struct list     shared_entry;    /* entry in global shared PE mappings 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 unsigned int mapping_map_access( struct object *obj, unsigned int access );
  57 static void mapping_destroy( struct object *obj );
  58
  59 static const struct object_ops mapping_ops =
  60 {
  61     sizeof(struct mapping),      /* size */
  62     mapping_dump,                /* dump */
  63     no_add_queue,                /* add_queue */
  64     NULL,                        /* remove_queue */
  65     NULL,                        /* signaled */
  66     NULL,                        /* satisfied */
  67     no_signal,                   /* signal */
  68     mapping_get_fd,              /* get_fd */
  69     mapping_map_access,          /* map_access */
  70     default_get_sd,              /* get_sd */
  71     default_set_sd,              /* set_sd */
  72     no_lookup_name,              /* lookup_name */
  73     no_open_file,                /* open_file */
  74     fd_close_handle,             /* close_handle */
  75     mapping_destroy              /* destroy */
  76 };
  77
  78 static struct list shared_list = LIST_INIT(shared_list);
  79
  80 #ifdef __i386__
  81
  82 /* These are always the same on an i386, and it will be faster this way */
  83 # define page_mask  0xfff
  84 # define page_shift 12
  85 # define init_page_size() do { /* nothing */ } while(0)
  86
  87 #else  /* __i386__ */
  88
  89 static int page_shift, page_mask;
  90
  91 static void init_page_size(void)
  92 {
  93     int page_size;
  94 # ifdef HAVE_GETPAGESIZE
  95     page_size = getpagesize();
  96 # else
  97 #  ifdef __svr4__
  98     page_size = sysconf(_SC_PAGESIZE);
  99 #  else
 100 #   error Cannot get the page size on this platform
 101 #  endif
 102 # endif
 103     page_mask = page_size - 1;
 104     /* Make sure we have a power of 2 */
 105     assert( !(page_size & page_mask) );
 106     page_shift = 0;
 107     while ((1 << page_shift) != page_size) page_shift++;
 108 }
 109 #endif  /* __i386__ */
 110
 111 #define ROUND_SIZE(size)  (((size) + page_mask) & ~page_mask)
 112
 113
 114 /* find the shared PE mapping for a given mapping */
 115 static struct file *get_shared_file( struct mapping *mapping )
 116 {
 117     struct mapping *ptr;
 118
 119     LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
 120         if (is_same_file( ptr->file, mapping->file ))
 121             return (struct file *)grab_object( ptr->shared_file );
 122     return NULL;
 123 }
 124
 125 /* return the size of the memory mapping and file range of a given section */
 126 static inline void get_section_sizes( const IMAGE_SECTION_HEADER *sec, size_t *map_size,
 127                                       off_t *file_start, size_t *file_size )
 128 {
 129     static const unsigned int sector_align = 0x1ff;
 130
 131     if (!sec->Misc.VirtualSize) *map_size = ROUND_SIZE( sec->SizeOfRawData );
 132     else *map_size = ROUND_SIZE( sec->Misc.VirtualSize );
 133
 134     *file_start = sec->PointerToRawData & ~sector_align;
 135     *file_size = (sec->SizeOfRawData + (sec->PointerToRawData & sector_align) + sector_align) & ~sector_align;
 136     if (*file_size > *map_size) *file_size = *map_size;
 137 }
 138
 139 /* allocate and fill the temp file for a shared PE image mapping */
 140 static int build_shared_mapping( struct mapping *mapping, int fd,
 141                                  IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
 142 {
 143     unsigned int i;
 144     size_t file_size, map_size, max_size, total_size;
 145     off_t shared_pos, read_pos, write_pos;
 146     char *buffer = NULL;
 147     int shared_fd;
 148     long toread;
 149
 150     /* compute the total size of the shared mapping */
 151
 152     total_size = max_size = 0;
 153     for (i = 0; i < nb_sec; i++)
 154     {
 155         if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
 156             (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
 157         {
 158             get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
 159             if (file_size > max_size) max_size = file_size;
 160             total_size += map_size;
 161         }
 162     }
 163     if (!(mapping->shared_size = total_size)) return 1;  /* nothing to do */
 164
 165     if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
 166
 167     /* create a temp file for the mapping */
 168
 169     if (!(mapping->shared_file = create_temp_file( FILE_GENERIC_READ|FILE_GENERIC_WRITE ))) return 0;
 170     if (!grow_file( mapping->shared_file, total_size )) goto error;
 171     if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
 172
 173     if (!(buffer = malloc( max_size ))) goto error;
 174
 175     /* copy the shared sections data into the temp file */
 176
 177     shared_pos = 0;
 178     for (i = 0; i < nb_sec; i++)
 179     {
 180         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
 181         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
 182         get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
 183         write_pos = shared_pos;
 184         shared_pos += map_size;
 185         if (!sec[i].PointerToRawData || !file_size) continue;
 186         toread = file_size;
 187         while (toread)
 188         {
 189             long res = pread( fd, buffer + file_size - toread, toread, read_pos );
 190             if (!res && toread < 0x200)  /* partial sector at EOF is not an error */
 191             {
 192                 file_size -= toread;
 193                 break;
 194             }
 195             if (res <= 0) goto error;
 196             toread -= res;
 197             read_pos += res;
 198         }
 199         if (pwrite( shared_fd, buffer, file_size, write_pos ) != file_size) goto error;
 200     }
 201     free( buffer );
 202     return 1;
 203
 204  error:
 205     release_object( mapping->shared_file );
 206     mapping->shared_file = NULL;
 207     free( buffer );
 208     return 0;
 209 }
 210
 211 /* retrieve the mapping parameters for an executable (PE) image */
 212 static int get_image_params( struct mapping *mapping )
 213 {
 214     IMAGE_DOS_HEADER dos;
 215     IMAGE_NT_HEADERS nt;
 216     IMAGE_SECTION_HEADER *sec = NULL;
 217     struct fd *fd;
 218     off_t pos;
 219     int unix_fd, size, toread;
 220
 221     /* load the headers */
 222
 223     if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
 224     if ((unix_fd = get_unix_fd( fd )) == -1) goto error;
 225     if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
 226     if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
 227     pos = dos.e_lfanew;
 228
 229     if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
 230         goto error;
 231     pos += sizeof(nt.Signature);
 232     if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
 233     if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
 234         goto error;
 235     pos += sizeof(nt.FileHeader);
 236     /* zero out Optional header in the case it's not present or partial */
 237     memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
 238     toread = min( sizeof(nt.OptionalHeader), nt.FileHeader.SizeOfOptionalHeader );
 239     if (pread( unix_fd, &nt.OptionalHeader, toread, pos ) != toread) goto error;
 240     pos += nt.FileHeader.SizeOfOptionalHeader;
 241
 242     /* load the section headers */
 243
 244     size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
 245     if (!(sec = malloc( size ))) goto error;
 246     if (pread( unix_fd, sec, size, pos ) != size) goto error;
 247
 248     if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
 249
 250     if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry );
 251
 252     mapping->size        = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
 253     mapping->base        = (void *)nt.OptionalHeader.ImageBase;
 254     mapping->header_size = max( pos + size, nt.OptionalHeader.SizeOfHeaders );
 255     mapping->protect     = VPROT_IMAGE;
 256
 257     /* sanity check */
 258     if (pos + size > mapping->size) goto error;
 259
 260     free( sec );
 261     release_object( fd );
 262     return 1;
 263
 264  error:
 265     free( sec );
 266     release_object( fd );
 267     set_error( STATUS_INVALID_FILE_FOR_SECTION );
 268     return 0;
 269 }
 270
 271 /* get the size of the unix file associated with the mapping */
 272 static inline int get_file_size( struct file *file, file_pos_t *size )
 273 {
 274     struct stat st;
 275     int unix_fd = get_file_unix_fd( file );
 276
 277     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0;
 278     *size = st.st_size;
 279     return 1;
 280 }
 281
 282 static struct object *create_mapping( struct directory *root, const struct unicode_str *name,
 283                                       unsigned int attr, file_pos_t size, int protect,
 284                                       obj_handle_t handle )
 285 {
 286     struct mapping *mapping;
 287     int access = 0;
 288
 289     if (!page_mask) init_page_size();
 290
 291     if (!(mapping = create_named_object_dir( root, name, attr, &mapping_ops )))
 292         return NULL;
 293     if (get_error() == STATUS_OBJECT_NAME_EXISTS)
 294         return &mapping->obj;  /* Nothing else to do */
 295
 296     mapping->header_size = 0;
 297     mapping->base        = NULL;
 298     mapping->shared_file = NULL;
 299     mapping->shared_size = 0;
 300
 301     if (protect & VPROT_READ) access |= FILE_READ_DATA;
 302     if (protect & VPROT_WRITE) access |= FILE_WRITE_DATA;
 303
 304     if (handle)
 305     {
 306         if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
 307         if (protect & VPROT_IMAGE)
 308         {
 309             if (!get_image_params( mapping )) goto error;
 310             return &mapping->obj;
 311         }
 312         if (!size)
 313         {
 314             if (!get_file_size( mapping->file, &size )) goto error;
 315             if (!size)
 316             {
 317                 set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
 318                 goto error;
 319             }
 320         }
 321         else
 322         {
 323             if (!grow_file( mapping->file, size )) goto error;
 324         }
 325     }
 326     else  /* Anonymous mapping (no associated file) */
 327     {
 328         if (!size || (protect & VPROT_IMAGE))
 329         {
 330             set_error( STATUS_INVALID_PARAMETER );
 331             mapping->file = NULL;
 332             goto error;
 333         }
 334         if (!(mapping->file = create_temp_file( access ))) goto error;
 335         if (!grow_file( mapping->file, size )) goto error;
 336     }
 337     mapping->size    = (size + page_mask) & ~((file_pos_t)page_mask);
 338     mapping->protect = protect;
 339     return &mapping->obj;
 340
 341  error:
 342     release_object( mapping );
 343     return NULL;
 344 }
 345
 346 static void mapping_dump( struct object *obj, int verbose )
 347 {
 348     struct mapping *mapping = (struct mapping *)obj;
 349     assert( obj->ops == &mapping_ops );
 350     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
 351              "shared_file=%p shared_size=%08x ",
 352              (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
 353              mapping->protect, mapping->file, mapping->header_size,
 354              mapping->base, mapping->shared_file, mapping->shared_size );
 355     dump_object_name( &mapping->obj );
 356     fputc( '\n', stderr );
 357 }
 358
 359 static struct fd *mapping_get_fd( struct object *obj )
 360 {
 361     struct mapping *mapping = (struct mapping *)obj;
 362     return get_obj_fd( (struct object *)mapping->file );
 363 }
 364
 365 static unsigned int mapping_map_access( struct object *obj, unsigned int access )
 366 {
 367     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | SECTION_QUERY | SECTION_MAP_READ;
 368     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | SECTION_MAP_WRITE;
 369     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SECTION_MAP_EXECUTE;
 370     if (access & GENERIC_ALL)     access |= SECTION_ALL_ACCESS;
 371     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 372 }
 373
 374 static void mapping_destroy( struct object *obj )
 375 {
 376     struct mapping *mapping = (struct mapping *)obj;
 377     assert( obj->ops == &mapping_ops );
 378     if (mapping->file) release_object( mapping->file );
 379     if (mapping->shared_file)
 380     {
 381         release_object( mapping->shared_file );
 382         list_remove( &mapping->shared_entry );
 383     }
 384 }
 385
 386 int get_page_size(void)
 387 {
 388     if (!page_mask) init_page_size();
 389     return page_mask + 1;
 390 }
 391
 392 /* create a file mapping */
 393 DECL_HANDLER(create_mapping)
 394 {
 395     struct object *obj;
 396     struct unicode_str name;
 397     struct directory *root = NULL;
 398     file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
 399
 400     reply->handle = 0;
 401     get_req_unicode_str( &name );
 402     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 403         return;
 404
 405     if ((obj = create_mapping( root, &name, req->attributes, size, req->protect, req->file_handle )))
 406     {
 407         reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
 408         release_object( obj );
 409     }
 410
 411     if (root) release_object( root );
 412 }
 413
 414 /* open a handle to a mapping */
 415 DECL_HANDLER(open_mapping)
 416 {
 417     struct unicode_str name;
 418     struct directory *root = NULL;
 419     struct mapping *mapping;
 420
 421     get_req_unicode_str( &name );
 422     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 423         return;
 424
 425     if ((mapping = open_object_dir( root, &name, req->attributes, &mapping_ops )))
 426     {
 427         reply->handle = alloc_handle( current->process, &mapping->obj, req->access, req->attributes );
 428         release_object( mapping );
 429     }
 430
 431     if (root) release_object( root );
 432 }
 433
 434 /* get a mapping information */
 435 DECL_HANDLER(get_mapping_info)
 436 {
 437     struct mapping *mapping;
 438     struct fd *fd;
 439
 440     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 441                                                      0, &mapping_ops )))
 442     {
 443         reply->size_high   = (unsigned int)(mapping->size >> 32);
 444         reply->size_low    = (unsigned int)mapping->size;
 445         reply->protect     = mapping->protect;
 446         reply->header_size = mapping->header_size;
 447         reply->base        = mapping->base;
 448         reply->shared_file = 0;
 449         reply->shared_size = mapping->shared_size;
 450         if ((fd = get_obj_fd( &mapping->obj )))
 451         {
 452             if (!is_fd_removable(fd))
 453                 reply->mapping = alloc_handle( current->process, mapping, 0, 0 );
 454             release_object( fd );
 455         }
 456         if (mapping->shared_file)
 457         {
 458             if (!(reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 459                                                      GENERIC_READ|GENERIC_WRITE, 0 )))
 460             {
 461                 if (reply->mapping) close_handle( current->process, reply->mapping );
 462             }
 463         }
 464         release_object( mapping );
 465     }
 466 }