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     struct list     shared_entry;    /* entry in global shared PE mappings list */
  51 };
  52
  53 static void mapping_dump( struct object *obj, int verbose );
  54 static struct fd *mapping_get_fd( struct object *obj );
  55 static unsigned int mapping_map_access( struct object *obj, unsigned int access );
  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     no_signal,                   /* signal */
  67     mapping_get_fd,              /* get_fd */
  68     mapping_map_access,          /* map_access */
  69     default_get_sd,              /* get_sd */
  70     default_set_sd,              /* set_sd */
  71     no_lookup_name,              /* lookup_name */
  72     no_open_file,                /* open_file */
  73     fd_close_handle,             /* close_handle */
  74     mapping_destroy              /* destroy */
  75 };
  76
  77 static struct list shared_list = LIST_INIT(shared_list);
  78
  79 #ifdef __i386__
  80
  81 /* These are always the same on an i386, and it will be faster this way */
  82 # define page_mask  0xfff
  83 # define page_shift 12
  84 # define init_page_size() do { /* nothing */ } while(0)
  85
  86 #else  /* __i386__ */
  87
  88 static int page_shift, page_mask;
  89
  90 static void init_page_size(void)
  91 {
  92     int page_size;
  93 # ifdef HAVE_GETPAGESIZE
  94     page_size = getpagesize();
  95 # else
  96 #  ifdef __svr4__
  97     page_size = sysconf(_SC_PAGESIZE);
  98 #  else
  99 #   error Cannot get the page size on this platform
 100 #  endif
 101 # endif
 102     page_mask = page_size - 1;
 103     /* Make sure we have a power of 2 */
 104     assert( !(page_size & page_mask) );
 105     page_shift = 0;
 106     while ((1 << page_shift) != page_size) page_shift++;
 107 }
 108 #endif  /* __i386__ */
 109
 110 #define ROUND_SIZE(size)  (((size) + page_mask) & ~page_mask)
 111
 112
 113 /* find the shared PE mapping for a given mapping */
 114 static struct file *get_shared_file( struct mapping *mapping )
 115 {
 116     struct mapping *ptr;
 117
 118     LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry )
 119         if (is_same_file( ptr->file, mapping->file ))
 120             return (struct file *)grab_object( ptr->shared_file );
 121     return NULL;
 122 }
 123
 124 /* return the size of the memory mapping and file range of a given section */
 125 static inline void get_section_sizes( const IMAGE_SECTION_HEADER *sec, size_t *map_size,
 126                                       off_t *file_start, size_t *file_size )
 127 {
 128     static const unsigned int sector_align = 0x1ff;
 129
 130     if (!sec->Misc.VirtualSize) *map_size = ROUND_SIZE( sec->SizeOfRawData );
 131     else *map_size = ROUND_SIZE( sec->Misc.VirtualSize );
 132
 133     *file_start = sec->PointerToRawData & ~sector_align;
 134     *file_size = (sec->SizeOfRawData + (sec->PointerToRawData & sector_align) + sector_align) & ~sector_align;
 135     if (*file_size > *map_size) *file_size = *map_size;
 136 }
 137
 138 /* allocate and fill the temp file for a shared PE image mapping */
 139 static int build_shared_mapping( struct mapping *mapping, int fd,
 140                                  IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
 141 {
 142     unsigned int i;
 143     file_pos_t total_size;
 144     size_t file_size, map_size, max_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 (!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
 300     if (protect & VPROT_READ) access |= FILE_READ_DATA;
 301     if (protect & VPROT_WRITE) access |= FILE_WRITE_DATA;
 302
 303     if (handle)
 304     {
 305         if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
 306         if (protect & VPROT_IMAGE)
 307         {
 308             if (!get_image_params( mapping )) goto error;
 309             return &mapping->obj;
 310         }
 311         if (!size)
 312         {
 313             if (!get_file_size( mapping->file, &size )) goto error;
 314             if (!size)
 315             {
 316                 set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
 317                 goto error;
 318             }
 319         }
 320         else
 321         {
 322             if (!grow_file( mapping->file, size )) goto error;
 323         }
 324     }
 325     else  /* Anonymous mapping (no associated file) */
 326     {
 327         if (!size || (protect & VPROT_IMAGE))
 328         {
 329             set_error( STATUS_INVALID_PARAMETER );
 330             mapping->file = NULL;
 331             goto error;
 332         }
 333         if (!(mapping->file = create_temp_file( access ))) goto error;
 334         if (!grow_file( mapping->file, size )) goto error;
 335     }
 336     mapping->size    = (size + page_mask) & ~((file_pos_t)page_mask);
 337     mapping->protect = protect;
 338     return &mapping->obj;
 339
 340  error:
 341     release_object( mapping );
 342     return NULL;
 343 }
 344
 345 static void mapping_dump( struct object *obj, int verbose )
 346 {
 347     struct mapping *mapping = (struct mapping *)obj;
 348     assert( obj->ops == &mapping_ops );
 349     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
 350              "shared_file=%p ",
 351              (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
 352              mapping->protect, mapping->file, mapping->header_size,
 353              mapping->base, mapping->shared_file );
 354     dump_object_name( &mapping->obj );
 355     fputc( '\n', stderr );
 356 }
 357
 358 static struct fd *mapping_get_fd( struct object *obj )
 359 {
 360     struct mapping *mapping = (struct mapping *)obj;
 361     return get_obj_fd( (struct object *)mapping->file );
 362 }
 363
 364 static unsigned int mapping_map_access( struct object *obj, unsigned int access )
 365 {
 366     if (access & GENERIC_READ)    access |= STANDARD_RIGHTS_READ | SECTION_QUERY | SECTION_MAP_READ;
 367     if (access & GENERIC_WRITE)   access |= STANDARD_RIGHTS_WRITE | SECTION_MAP_WRITE;
 368     if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SECTION_MAP_EXECUTE;
 369     if (access & GENERIC_ALL)     access |= SECTION_ALL_ACCESS;
 370     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 371 }
 372
 373 static void mapping_destroy( struct object *obj )
 374 {
 375     struct mapping *mapping = (struct mapping *)obj;
 376     assert( obj->ops == &mapping_ops );
 377     if (mapping->file) release_object( mapping->file );
 378     if (mapping->shared_file)
 379     {
 380         release_object( mapping->shared_file );
 381         list_remove( &mapping->shared_entry );
 382     }
 383 }
 384
 385 int get_page_size(void)
 386 {
 387     if (!page_mask) init_page_size();
 388     return page_mask + 1;
 389 }
 390
 391 /* create a file mapping */
 392 DECL_HANDLER(create_mapping)
 393 {
 394     struct object *obj;
 395     struct unicode_str name;
 396     struct directory *root = NULL;
 397
 398     reply->handle = 0;
 399     get_req_unicode_str( &name );
 400     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 401         return;
 402
 403     if ((obj = create_mapping( root, &name, req->attributes, req->size, req->protect, req->file_handle )))
 404     {
 405         reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
 406         release_object( obj );
 407     }
 408
 409     if (root) release_object( root );
 410 }
 411
 412 /* open a handle to a mapping */
 413 DECL_HANDLER(open_mapping)
 414 {
 415     struct unicode_str name;
 416     struct directory *root = NULL;
 417     struct mapping *mapping;
 418
 419     get_req_unicode_str( &name );
 420     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 421         return;
 422
 423     if ((mapping = open_object_dir( root, &name, req->attributes, &mapping_ops )))
 424     {
 425         reply->handle = alloc_handle( current->process, &mapping->obj, req->access, req->attributes );
 426         release_object( mapping );
 427     }
 428
 429     if (root) release_object( root );
 430 }
 431
 432 /* get a mapping information */
 433 DECL_HANDLER(get_mapping_info)
 434 {
 435     struct mapping *mapping;
 436     struct fd *fd;
 437
 438     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 439                                                      0, &mapping_ops )))
 440     {
 441         reply->size        = mapping->size;
 442         reply->protect     = mapping->protect;
 443         reply->header_size = mapping->header_size;
 444         reply->base        = mapping->base;
 445         reply->shared_file = 0;
 446         if ((fd = get_obj_fd( &mapping->obj )))
 447         {
 448             if (!is_fd_removable(fd))
 449                 reply->mapping = alloc_handle( current->process, mapping, 0, 0 );
 450             release_object( fd );
 451         }
 452         if (mapping->shared_file)
 453         {
 454             if (!(reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 455                                                      GENERIC_READ|GENERIC_WRITE, 0 )))
 456             {
 457                 if (reply->mapping) close_handle( current->process, reply->mapping );
 458             }
 459         }
 460         release_object( mapping );
 461     }
 462 }