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