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     int             size_high;       /* mapping size */
  43     int             size_low;        /* mapping size */
  44     int             protect;         /* protection flags */
  45     struct file    *file;            /* file mapped */
  46     int             header_size;     /* size of headers (for PE image mapping) */
  47     void           *base;            /* default base addr (for PE image mapping) */
  48     struct file    *shared_file;     /* temp file for shared PE mapping */
  49     int             shared_size;     /* shared mapping total size */
  50     struct mapping *shared_next;     /* next in shared PE mapping list */
  51     struct mapping *shared_prev;     /* prev in shared PE mapping 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 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     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_ADDR(addr) \
 104    ((int)(addr) & ~page_mask)
 105
 106 #define ROUND_SIZE_MASK(addr,size,mask) \
 107    (((int)(size) + ((int)(addr) & (mask)) + (mask)) & ~(mask))
 108
 109 #define ROUND_SIZE(addr,size) ROUND_SIZE_MASK( addr, size, page_mask )
 110
 111
 112 /* find the shared PE mapping for a given mapping */
 113 static struct file *get_shared_file( struct mapping *mapping )
 114 {
 115     struct mapping *ptr;
 116
 117     for (ptr = shared_first; ptr; ptr = ptr->shared_next)
 118         if (is_same_file( ptr->file, mapping->file ))
 119             return (struct file *)grab_object( ptr->shared_file );
 120     return NULL;
 121 }
 122
 123 /* allocate and fill the temp file for a shared PE image mapping */
 124 static int build_shared_mapping( struct mapping *mapping, int fd,
 125                                  IMAGE_SECTION_HEADER *sec, int nb_sec )
 126 {
 127     int i, max_size, total_size;
 128     off_t shared_pos, read_pos, write_pos;
 129     char *buffer = NULL;
 130     int shared_fd;
 131     long toread;
 132
 133     /* compute the total size of the shared mapping */
 134
 135     total_size = max_size = 0;
 136     for (i = 0; i < nb_sec; i++)
 137     {
 138         if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
 139             (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
 140         {
 141             int size = ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
 142             if (size > max_size) max_size = size;
 143             total_size += size;
 144         }
 145     }
 146     if (!(mapping->shared_size = total_size)) return 1;  /* nothing to do */
 147
 148     if ((mapping->shared_file = get_shared_file( mapping ))) return 1;
 149
 150     /* create a temp file for the mapping */
 151
 152     if (!(mapping->shared_file = create_temp_file( GENERIC_READ|GENERIC_WRITE ))) return 0;
 153     if (!grow_file( mapping->shared_file, 0, total_size )) goto error;
 154     if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error;
 155
 156     if (!(buffer = malloc( max_size ))) goto error;
 157
 158     /* copy the shared sections data into the temp file */
 159
 160     shared_pos = 0;
 161     for (i = 0; i < nb_sec; i++)
 162     {
 163         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
 164         if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
 165         write_pos = shared_pos;
 166         shared_pos += ROUND_SIZE( 0, sec[i].Misc.VirtualSize );
 167         if ((sec[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) &&
 168             !(sec[i].Characteristics & IMAGE_SCN_CNT_INITIALIZED_DATA)) continue;
 169         if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue;
 170         read_pos = sec[i].PointerToRawData;
 171         toread = sec[i].SizeOfRawData;
 172         while (toread)
 173         {
 174             long res = pread( fd, buffer + sec[i].SizeOfRawData - toread, toread, read_pos );
 175             if (res <= 0) goto error;
 176             toread -= res;
 177             read_pos += res;
 178         }
 179         if (pwrite( shared_fd, buffer, sec[i].SizeOfRawData, write_pos ) != sec[i].SizeOfRawData)
 180             goto error;
 181     }
 182     free( buffer );
 183     return 1;
 184
 185  error:
 186     release_object( mapping->shared_file );
 187     mapping->shared_file = NULL;
 188     if (buffer) free( buffer );
 189     return 0;
 190 }
 191
 192 /* retrieve the mapping parameters for an executable (PE) image */
 193 static int get_image_params( struct mapping *mapping )
 194 {
 195     IMAGE_DOS_HEADER dos;
 196     IMAGE_NT_HEADERS nt;
 197     IMAGE_SECTION_HEADER *sec = NULL;
 198     struct fd *fd;
 199     off_t pos;
 200     int unix_fd, size;
 201
 202     /* load the headers */
 203
 204     if (!(fd = mapping_get_fd( &mapping->obj ))) return 0;
 205     unix_fd = get_unix_fd( fd );
 206     if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error;
 207     if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
 208     pos = dos.e_lfanew;
 209
 210     if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature))
 211         goto error;
 212     pos += sizeof(nt.Signature);
 213     if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
 214     if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader))
 215         goto error;
 216     pos += sizeof(nt.FileHeader);
 217     /* zero out Optional header in the case it's not present or partial */
 218     memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
 219     if (pread( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader,
 220                pos ) != nt.FileHeader.SizeOfOptionalHeader) goto error;
 221     pos += nt.FileHeader.SizeOfOptionalHeader;
 222
 223     /* load the section headers */
 224
 225     size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
 226     if (!(sec = malloc( size ))) goto error;
 227     if (pread( unix_fd, sec, size, pos ) != size) goto error;
 228
 229     if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
 230
 231     if (mapping->shared_file)  /* link it in the list */
 232     {
 233         if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping;
 234         mapping->shared_prev = NULL;
 235         shared_first = mapping;
 236     }
 237
 238     mapping->size_low    = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
 239     mapping->size_high   = 0;
 240     mapping->base        = (void *)nt.OptionalHeader.ImageBase;
 241     mapping->header_size = ROUND_SIZE_MASK( mapping->base, nt.OptionalHeader.SizeOfHeaders,
 242                                             nt.OptionalHeader.SectionAlignment - 1 );
 243     mapping->protect     = VPROT_IMAGE;
 244
 245     /* sanity check */
 246     if (mapping->header_size > mapping->size_low) goto error;
 247
 248     free( sec );
 249     release_object( fd );
 250     return 1;
 251
 252  error:
 253     if (sec) free( sec );
 254     release_object( fd );
 255     set_error( STATUS_INVALID_FILE_FOR_SECTION );
 256     return 0;
 257 }
 258
 259 /* get the size of the unix file associated with the mapping */
 260 inline static int get_file_size( struct file *file, int *size_high, int *size_low )
 261 {
 262     struct stat st;
 263     int unix_fd = get_file_unix_fd( file );
 264
 265     if (fstat( unix_fd, &st ) == -1) return 0;
 266     *size_high = st.st_size >> 32;
 267     *size_low  = st.st_size & 0xffffffff;
 268     return 1;
 269 }
 270
 271 static struct object *create_mapping( int size_high, int size_low, int protect,
 272                                       obj_handle_t handle, const WCHAR *name, size_t len )
 273 {
 274     struct mapping *mapping;
 275     int access = 0;
 276
 277     if (!page_mask) init_page_size();
 278
 279     if (!(mapping = create_named_object( sync_namespace, &mapping_ops, name, len )))
 280         return NULL;
 281     if (get_error() == STATUS_OBJECT_NAME_COLLISION)
 282         return &mapping->obj;  /* Nothing else to do */
 283
 284     mapping->header_size = 0;
 285     mapping->base        = NULL;
 286     mapping->shared_file = NULL;
 287     mapping->shared_size = 0;
 288
 289     if (protect & VPROT_READ) access |= GENERIC_READ;
 290     if (protect & VPROT_WRITE) access |= GENERIC_WRITE;
 291
 292     if (handle)
 293     {
 294         if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error;
 295         if (protect & VPROT_IMAGE)
 296         {
 297             if (!get_image_params( mapping )) goto error;
 298             return &mapping->obj;
 299         }
 300         if (!size_high && !size_low)
 301         {
 302             if (!get_file_size( mapping->file, &size_high, &size_low )) goto error;
 303             if (!size_high && !size_low)
 304             {
 305                 set_error( STATUS_FILE_INVALID );
 306                 goto error;
 307             }
 308         }
 309         else
 310         {
 311             if (!grow_file( mapping->file, size_high, size_low )) goto error;
 312         }
 313     }
 314     else  /* Anonymous mapping (no associated file) */
 315     {
 316         if ((!size_high && !size_low) || (protect & VPROT_IMAGE))
 317         {
 318             set_error( STATUS_INVALID_PARAMETER );
 319             mapping->file = NULL;
 320             goto error;
 321         }
 322         if (!(mapping->file = create_temp_file( access ))) goto error;
 323         if (!grow_file( mapping->file, size_high, size_low )) goto error;
 324     }
 325     mapping->size_high = size_high;
 326     mapping->size_low  = ROUND_SIZE( 0, size_low );
 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              mapping->size_high, mapping->size_low, mapping->protect, mapping->file,
 342              mapping->header_size, mapping->base, mapping->shared_file, mapping->shared_size );
 343     dump_object_name( &mapping->obj );
 344     fputc( '\n', stderr );
 345 }
 346
 347 static struct fd *mapping_get_fd( struct object *obj )
 348 {
 349     struct mapping *mapping = (struct mapping *)obj;
 350     return get_obj_fd( (struct object *)mapping->file );
 351 }
 352
 353 static void mapping_destroy( struct object *obj )
 354 {
 355     struct mapping *mapping = (struct mapping *)obj;
 356     assert( obj->ops == &mapping_ops );
 357     if (mapping->file) release_object( mapping->file );
 358     if (mapping->shared_file)
 359     {
 360         release_object( mapping->shared_file );
 361         if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev;
 362         if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next;
 363         else shared_first = mapping->shared_next;
 364     }
 365 }
 366
 367 int get_page_size(void)
 368 {
 369     if (!page_mask) init_page_size();
 370     return page_mask + 1;
 371 }
 372
 373 /* create a file mapping */
 374 DECL_HANDLER(create_mapping)
 375 {
 376     struct object *obj;
 377
 378     reply->handle = 0;
 379     if ((obj = create_mapping( req->size_high, req->size_low,
 380                                req->protect, req->file_handle,
 381                                get_req_data(), get_req_data_size() )))
 382     {
 383         reply->handle = alloc_handle( current->process, obj, req->access, req->inherit );
 384         release_object( obj );
 385     }
 386 }
 387
 388 /* open a handle to a mapping */
 389 DECL_HANDLER(open_mapping)
 390 {
 391     reply->handle = open_object( sync_namespace, get_req_data(), get_req_data_size(),
 392                                  &mapping_ops, req->access, req->inherit );
 393 }
 394
 395 /* get a mapping information */
 396 DECL_HANDLER(get_mapping_info)
 397 {
 398     struct mapping *mapping;
 399
 400     if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle,
 401                                                      0, &mapping_ops )))
 402     {
 403         reply->size_high   = mapping->size_high;
 404         reply->size_low    = mapping->size_low;
 405         reply->protect     = mapping->protect;
 406         reply->header_size = mapping->header_size;
 407         reply->base        = mapping->base;
 408         reply->shared_file = 0;
 409         reply->shared_size = mapping->shared_size;
 410         if (mapping->shared_file)
 411             reply->shared_file = alloc_handle( current->process, mapping->shared_file,
 412                                                GENERIC_READ|GENERIC_WRITE, 0 );
 413         release_object( mapping );
 414     }
 415 }