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     file_pos_t      size;            /* mapping size */
  43     int             protect;         /* protection flags */
  44     struct file    *file;            /* file mapped */
  45     int             header_size;     /* size of headers (for PE image mapping) */
  46     void           *base;            /* default base addr (for PE image mapping) */
  47     struct file    *shared_file;     /* temp file for shared PE mapping */
  48     int             shared_size;     /* shared mapping total size */
  49     struct mapping *shared_next;     /* next in shared PE mapping list */
  50     struct mapping *shared_prev;     /* prev in shared PE mapping 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 void mapping_destroy( struct object *obj );
  56
  57 static const struct object_ops mapping_ops =
  58 {
  59     sizeof(struct mapping),      /* size */
  60     mapping_dump,                /* dump */
  61     no_add_queue,                /* add_queue */
  62     NULL,                        /* remove_queue */
  63     NULL,                        /* signaled */
  64     NULL,                        /* satisfied */
  65     no_signal,                   /* signal */
  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_SIZE_MASK(addr,size,mask) \
 104    (((int)(size) + ((int)(addr) & (mask)) + (mask)) & ~(mask))
 105
 106 #define ROUND_SIZE(size)  (((size) + page_mask) & ~page_mask)
 107
 108
 109 /* find the shared PE mapping for a given mapping */
 110 static struct file *get_shared_file( struct mapping *mapping )
 111 {
 112     struct mapping *ptr;
 113
 114     for (ptr = shared_first; ptr; ptr = ptr->shared_next)
 115         if (is_same_file( ptr->file, mapping->file ))
 116             return (struct file *)grab_object( ptr->shared_file );
 117     return NULL;
 118 }
 119
 120 /* allocate and fill the temp file for a shared PE image mapping */
 121 static int build_shared_mapping( struct mapping *mapping, int fd,
 122                                  IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
 123 {
 124     unsigned int i, max_size, total_size;
 125     off_t shared_pos, read_pos, write_pos;
 126     char *buffer = NULL;
 127     int shared_fd;
 128     long toread;
 129
 130     /* compute the total size of the shared mapping */
 131
 132     total_size = max_size = 0;
 133     for (i = 0; i < nb_sec; i++)
 134     {
 135         if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
 136             (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
 137         {
 138             unsigned int size = ROUND_SIZE( sec[i].Misc.VirtualSize );
 139             if (size > max_size) max_size = size;
 140             total_size += size;
 141         }
 142     }
 143     if (!(mapping->shared_size = total_size)) return 1;  /* nothing to do */
 144
 145     if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
 146
 147     /* create a temp file for the mapping */
 148
 149     if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
 150     if (!grow_file( mapping->shared_file, total_size )) goto error;
 151     if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
 152
 153     if (!(buffer = malloc( max_size ))) goto error;
 154
 155     /* copy the shared sections data into the temp file */
 156
 157     shared_pos = 0;
 158     for (i = 0; i < nb_sec; i++)
 159     {
 160         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
 161         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
 162         write_pos = shared_pos;
 163         shared_pos += ROUND_SIZE( sec[i].Misc.VirtualSize );
 164         if ((sec[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) &&
 165             !(sec[i].Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)) continue;
 166         if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
 167         read_pos = sec[i].PointerToRawData;
 168         toread = sec[i].SizeOfRawData;
 169         while (toread)
 170         {
 171             long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
 172             if (res <= 0) goto error;
 173             toread -= res;
 174             read_pos += res;
 175         }
 176         if (pwrite( shared_fd, buffer, sec[i].SizeOfRawData, write_pos ) != sec[i].SizeOfRawData)
 177             goto error;
 178     }
 179     free( buffer );
 180     return 1;
 181
 182  error:
 183     release_object( mapping->shared_file );
 184     mapping->shared_file = NULL;
 185     if (buffer) free( buffer );
 186     return 0;
 187 }
 188
 189 /* retrieve the mapping parameters for an executable (PE) image */
 190 static int get_image_params( struct mapping *mapping )
 191 {
 192     IMAGE_DOS_HEADER dos;
 193     IMAGE_NT_HEADERS nt;
 194     IMAGE_SECTION_HEADER *sec = NULL;
 195     struct fd *fd;
 196     off_t pos;
 197     int unix_fd, size;
 198
 199     /* load the headers */
 200
 201     if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
 202     unix_fd = get_unix_fd( fd );
 203     if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
 204     if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
 205     pos = dos.e_lfanew;
 206
 207     if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
 208         goto error;
 209     pos += sizeof(nt.Signature);
 210     if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
 211     if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
 212         goto error;
 213     pos += sizeof(nt.FileHeader);
 214     /* zero out Optional header in the case it's not present or partial */
 215     memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
 216     if (pread( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader,
 217                pos ) != nt.FileHeader.SizeOfOptionalHeader) goto error;
 218     pos += nt.FileHeader.SizeOfOptionalHeader;
 219
 220     /* load the section headers */
 221
 222     size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
 223     if (!(sec = malloc( size ))) goto error;
 224     if (pread( unix_fd, sec, size, pos ) != size) goto error;
 225
 226     if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
 227
 228     if (mapping->shared_file)  /* link it in the list */
 229     {
 230         if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
 231         mapping->shared_prev = NULL;
 232         shared_first = mapping;
 233     }
 234
 235     mapping->size        = ROUND_SIZE( nt.OptionalHeader.SizeOfImage );
 236     mapping->base        = (void *)nt.OptionalHeader.ImageBase;
 237     mapping->header_size = ROUND_SIZE_MASK( mapping->base, nt.OptionalHeader.SizeOfHeaders,
 238                                             nt.OptionalHeader.SectionAlignment - 1 );
 239     mapping->protect     = VPROT_IMAGE;
 240
 241     /* sanity check */
 242     if (mapping->header_size > mapping->size) goto error;
 243
 244     free( sec );
 245     release_object( fd );
 246     return 1;
 247
 248  error:
 249     if (sec) free( sec );
 250     release_object( fd );
 251     set_error( STATUS_INVALID_FILE_FOR_SECTION );
 252     return 0;
 253 }
 254
 255 /* get the size of the unix file associated with the mapping */
 256 inline static int get_file_size( struct file *file, file_pos_t *size )
 257 {
 258     struct stat st;
 259     int unix_fd = get_file_unix_fd( file );
 260
 261     if (fstat( unix_fd, &st ) == -1) return 0;
 262     *size = st.st_size;
 263     return 1;
 264 }
 265
 266 static struct object *create_mapping( file_pos_t size, int protect, obj_handle_t handle,
 267                                       const WCHAR *name, size_t len )
 268 {
 269     struct mapping *mapping;
 270     int access = 0;
 271
 272     if (!page_mask) init_page_size();
 273
 274     if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, len )))
 275         return NULL;
 276     if (get_error() == STATUS_OBJECT_NAME_COLLISION)
 277         return &mapping->obj;  /* Nothing else to do */
 278
 279     mapping->header_size = 0;
 280     mapping->base        = NULL;
 281     mapping->shared_file = NULL;
 282     mapping->shared_size = 0;
 283
 284     if (protect & VPROT_READ) access |= GENERIC_READ;
 285     if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
 286
 287     if (handle)
 288     {
 289         if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
 290         if (protect & VPROT_IMAGE)
 291         {
 292             if (!get_image_params( mapping )) goto error;
 293             return &mapping->obj;
 294         }
 295         if (!size)
 296         {
 297             if (!get_file_size( mapping->file, &size )) goto error;
 298             if (!size)
 299             {
 300                 set_error( STATUS_FILE_INVALID );
 301                 goto error;
 302             }
 303         }
 304         else
 305         {
 306             if (!grow_file( mapping->file, size )) goto error;
 307         }
 308     }
 309     else  /* Anonymous mapping (no associated file) */
 310     {
 311         if (!size || (protect & VPROT_IMAGE))
 312         {
 313             set_error( STATUS_INVALID_PARAMETER );
 314             mapping->file = NULL;
 315             goto error;
 316         }
 317         if (!(mapping->file = create_temp_file( access ))) goto error;
 318         if (!grow_file( mapping->file, size )) goto error;
 319     }
 320     mapping->size    = (size + page_mask) & ~((file_pos_t)page_mask);
 321     mapping->protect = protect;
 322     return &mapping->obj;
 323
 324  error:
 325     release_object( mapping );
 326     return NULL;
 327 }
 328
 329 static void mapping_dump( struct object *obj, int verbose )
 330 {
 331     struct mapping *mapping = (struct mapping *)obj;
 332     assert( obj->ops == &mapping_ops );
 333     fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p "
 334              "shared_file=%p shared_size=%08x ",
 335              (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
 336              mapping->protect, mapping->file, mapping->header_size,
 337              mapping->base, mapping->shared_file, mapping->shared_size );
 338     dump_object_name( &mapping->obj );
 339     fputc( '\n', stderr );
 340 }
 341
 342 static struct fd *mapping_get_fd( struct object *obj )
 343 {
 344     struct mapping *mapping = (struct mapping *)obj;
 345     return get_obj_fd( (struct object *)mapping->file );
 346 }
 347
 348 static void mapping_destroy( struct object *obj )
 349 {
 350     struct mapping *mapping = (struct mapping *)obj;
 351     assert( obj->ops == &mapping_ops );
 352     if (mapping->file) release_object( mapping->file );
 353     if (mapping->shared_file)
 354     {
 355         release_object( mapping->shared_file );
 356         if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
 357         if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
 358         else shared_first = mapping->shared_next;
 359     }
 360 }
 361
 362 int get_page_size(void)
 363 {
 364     if (!page_mask) init_page_size();
 365     return page_mask + 1;
 366 }
 367
 368 /* create a file mapping */
 369 DECL_HANDLER(create_mapping)
 370 {
 371     struct object *obj;
 372     file_pos_t size = ((file_pos_t)req->size_high << 32) | req->size_low;
 373
 374     reply->handle = 0;
 375     if ((obj = create_mapping( size, req->protect, req->file_handle,
 376                                get_req_data(), get_req_data_size() )))
 377     {
 378         reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
 379         release_object( obj );
 380     }
 381 }
 382
 383 /* open a handle to a mapping */
 384 DECL_HANDLER(open_mapping)
 385 {
 386     reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
 387                                  &mapping_ops, req->access, req->inherit );
 388 }
 389
 390 /* get a mapping information */
 391 DECL_HANDLER(get_mapping_info)
 392 {
 393     struct mapping *mapping;
 394
 395     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 396                                                      0, &mapping_ops )))
 397     {
 398         reply->size_high   = (unsigned int)(mapping->size >> 32);
 399         reply->size_low    = (unsigned int)mapping->size;
 400         reply->protect     = mapping->protect;
 401         reply->header_size = mapping->header_size;
 402         reply->base        = mapping->base;
 403         reply->shared_file = 0;
 404         reply->shared_size = mapping->shared_size;
 405         if (mapping->shared_file)
 406             reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 407                                                GENERIC_READ|GENERIC_WRITE, 0 );
 408         release_object( mapping );
 409     }
 410 }