?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mshtml: Use fire_event_obj to dispatch XHR readystatechange event.
[wine.git] / server / mapping.c
blobd9bff4b2ead9fca76a948a26df77fd563f3643f7
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 #ifdef HAVE_SYS_MMAN_H
30 # include <sys/mman.h>
31 #endif
32 #include <unistd.h>
33
34 #include "ntstatus.h"
35 #define WIN32_NO_STATUS
36 #include "windef.h"
37 #include "winternl.h"
38
39 #include "file.h"
40 #include "handle.h"
41 #include "thread.h"
42 #include "process.h"
43 #include "request.h"
44 #include "security.h"
45
46 /* list of memory ranges, used to store committed info */
47 struct ranges
48 {
49 struct object obj; /* object header */
50 unsigned int count; /* number of used ranges */
51 unsigned int max; /* number of allocated ranges */
52 struct range
53 {
54 file_pos_t start;
55 file_pos_t end;
56 } *ranges;
57 };
58
59 static void ranges_dump( struct object *obj, int verbose );
60 static void ranges_destroy( struct object *obj );
61
62 static const struct object_ops ranges_ops =
63 {
64 sizeof(struct ranges), /* size */
65 ranges_dump, /* dump */
66 no_get_type, /* get_type */
67 no_add_queue, /* add_queue */
68 NULL, /* remove_queue */
69 NULL, /* signaled */
70 NULL, /* satisfied */
71 no_signal, /* signal */
72 no_get_fd, /* get_fd */
73 no_map_access, /* map_access */
74 default_get_sd, /* get_sd */
75 default_set_sd, /* set_sd */
76 no_lookup_name, /* lookup_name */
77 no_link_name, /* link_name */
78 NULL, /* unlink_name */
79 no_open_file, /* open_file */
80 no_close_handle, /* close_handle */
81 ranges_destroy /* destroy */
82 };
83
84 /* file backing the shared sections of a PE image mapping */
85 struct shared_map
86 {
87 struct object obj; /* object header */
88 struct fd *fd; /* file descriptor of the mapped PE file */
89 struct file *file; /* temp file holding the shared data */
90 struct list entry; /* entry in global shared maps list */
91 };
92
93 static void shared_map_dump( struct object *obj, int verbose );
94 static void shared_map_destroy( struct object *obj );
95
96 static const struct object_ops shared_map_ops =
97 {
98 sizeof(struct shared_map), /* size */
99 shared_map_dump, /* dump */
100 no_get_type, /* get_type */
101 no_add_queue, /* add_queue */
102 NULL, /* remove_queue */
103 NULL, /* signaled */
104 NULL, /* satisfied */
105 no_signal, /* signal */
106 no_get_fd, /* get_fd */
107 no_map_access, /* map_access */
108 default_get_sd, /* get_sd */
109 default_set_sd, /* set_sd */
110 no_lookup_name, /* lookup_name */
111 no_link_name, /* link_name */
112 NULL, /* unlink_name */
113 no_open_file, /* open_file */
114 no_close_handle, /* close_handle */
115 shared_map_destroy /* destroy */
116 };
117
118 static struct list shared_map_list = LIST_INIT( shared_map_list );
119
120 /* memory view mapped in client address space */
121 struct memory_view
122 {
123 struct list entry; /* entry in per-process view list */
124 struct fd *fd; /* fd for mapped file */
125 struct ranges *committed; /* list of committed ranges in this mapping */
126 struct shared_map *shared; /* temp file for shared PE mapping */
127 unsigned int flags; /* SEC_* flags */
128 client_ptr_t base; /* view base address (in process addr space) */
129 mem_size_t size; /* view size */
130 file_pos_t start; /* start offset in mapping */
131 };
132
133 struct mapping
134 {
135 struct object obj; /* object header */
136 mem_size_t size; /* mapping size */
137 unsigned int flags; /* SEC_* flags */
138 struct fd *fd; /* fd for mapped file */
139 enum cpu_type cpu; /* client CPU (for PE image mapping) */
140 pe_image_info_t image; /* image info (for PE image mapping) */
141 struct ranges *committed; /* list of committed ranges in this mapping */
142 struct shared_map *shared; /* temp file for shared PE mapping */
143 };
144
145 static void mapping_dump( struct object *obj, int verbose );
146 static struct object_type *mapping_get_type( struct object *obj );
147 static struct fd *mapping_get_fd( struct object *obj );
148 static unsigned int mapping_map_access( struct object *obj, unsigned int access );
149 static void mapping_destroy( struct object *obj );
150 static enum server_fd_type mapping_get_fd_type( struct fd *fd );
151
152 static const struct object_ops mapping_ops =
153 {
154 sizeof(struct mapping), /* size */
155 mapping_dump, /* dump */
156 mapping_get_type, /* get_type */
157 no_add_queue, /* add_queue */
158 NULL, /* remove_queue */
159 NULL, /* signaled */
160 NULL, /* satisfied */
161 no_signal, /* signal */
162 mapping_get_fd, /* get_fd */
163 mapping_map_access, /* map_access */
164 default_get_sd, /* get_sd */
165 default_set_sd, /* set_sd */
166 no_lookup_name, /* lookup_name */
167 directory_link_name, /* link_name */
168 default_unlink_name, /* unlink_name */
169 no_open_file, /* open_file */
170 fd_close_handle, /* close_handle */
171 mapping_destroy /* destroy */
172 };
173
174 static const struct fd_ops mapping_fd_ops =
175 {
176 default_fd_get_poll_events, /* get_poll_events */
177 default_poll_event, /* poll_event */
178 mapping_get_fd_type, /* get_fd_type */
179 no_fd_read, /* read */
180 no_fd_write, /* write */
181 no_fd_flush, /* flush */
182 no_fd_get_volume_info, /* get_volume_info */
183 no_fd_ioctl, /* ioctl */
184 no_fd_queue_async, /* queue_async */
185 default_fd_reselect_async /* reselect_async */
186 };
187
188 static size_t page_mask;
189
190 #define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
191
192
193 static void ranges_dump( struct object *obj, int verbose )
194 {
195 struct ranges *ranges = (struct ranges *)obj;
196 fprintf( stderr, "Memory ranges count=%u\n", ranges->count );
197 }
198
199 static void ranges_destroy( struct object *obj )
200 {
201 struct ranges *ranges = (struct ranges *)obj;
202 free( ranges->ranges );
203 }
204
205 static void shared_map_dump( struct object *obj, int verbose )
206 {
207 struct shared_map *shared = (struct shared_map *)obj;
208 fprintf( stderr, "Shared mapping fd=%p file=%p\n", shared->fd, shared->file );
209 }
210
211 static void shared_map_destroy( struct object *obj )
212 {
213 struct shared_map *shared = (struct shared_map *)obj;
214
215 release_object( shared->fd );
216 release_object( shared->file );
217 list_remove( &shared->entry );
218 }
219
220 /* extend a file beyond the current end of file */
221 static int grow_file( int unix_fd, file_pos_t new_size )
222 {
223 static const char zero;
224 off_t size = new_size;
225
226 if (sizeof(new_size) > sizeof(size) && size != new_size)
227 {
228 set_error( STATUS_INVALID_PARAMETER );
229 return 0;
230 }
231 /* extend the file one byte beyond the requested size and then truncate it */
232 /* this should work around ftruncate implementations that can't extend files */
233 if (pwrite( unix_fd, &zero, 1, size ) != -1)
234 {
235 ftruncate( unix_fd, size );
236 return 1;
237 }
238 file_set_error();
239 return 0;
240 }
241
242 /* check if the current directory allows exec mappings */
243 static int check_current_dir_for_exec(void)
244 {
245 int fd;
246 char tmpfn[] = "anonmap.XXXXXX";
247 void *ret = MAP_FAILED;
248
249 fd = mkstemps( tmpfn, 0 );
250 if (fd == -1) return 0;
251 if (grow_file( fd, 1 ))
252 {
253 ret = mmap( NULL, get_page_size(), PROT_READ | PROT_EXEC, MAP_PRIVATE, fd, 0 );
254 if (ret != MAP_FAILED) munmap( ret, get_page_size() );
255 }
256 close( fd );
257 unlink( tmpfn );
258 return (ret != MAP_FAILED);
259 }
260
261 /* create a temp file for anonymous mappings */
262 static int create_temp_file( file_pos_t size )
263 {
264 static int temp_dir_fd = -1;
265 char tmpfn[] = "anonmap.XXXXXX";
266 int fd;
267
268 if (temp_dir_fd == -1)
269 {
270 temp_dir_fd = server_dir_fd;
271 if (!check_current_dir_for_exec())
272 {
273 /* the server dir is noexec, try the config dir instead */
274 fchdir( config_dir_fd );
275 if (check_current_dir_for_exec())
276 temp_dir_fd = config_dir_fd;
277 else /* neither works, fall back to server dir */
278 fchdir( server_dir_fd );
279 }
280 }
281 else if (temp_dir_fd != server_dir_fd) fchdir( temp_dir_fd );
282
283 fd = mkstemps( tmpfn, 0 );
284 if (fd != -1)
285 {
286 if (!grow_file( fd, size ))
287 {
288 close( fd );
289 fd = -1;
290 }
291 unlink( tmpfn );
292 }
293 else file_set_error();
294
295 if (temp_dir_fd != server_dir_fd) fchdir( server_dir_fd );
296 return fd;
297 }
298
299 /* find a memory view from its base address */
300 static struct memory_view *find_mapped_view( struct process *process, client_ptr_t base )
301 {
302 struct memory_view *view;
303
304 LIST_FOR_EACH_ENTRY( view, &process->views, struct memory_view, entry )
305 if (view->base == base) return view;
306
307 set_error( STATUS_NOT_MAPPED_VIEW );
308 return NULL;
309 }
310
311 static void free_memory_view( struct memory_view *view )
312 {
313 if (view->fd) release_object( view->fd );
314 if (view->committed) release_object( view->committed );
315 if (view->shared) release_object( view->shared );
316 list_remove( &view->entry );
317 free( view );
318 }
319
320 /* free all mapped views at process exit */
321 void free_mapped_views( struct process *process )
322 {
323 struct list *ptr;
324
325 while ((ptr = list_head( &process->views )))
326 free_memory_view( LIST_ENTRY( ptr, struct memory_view, entry ));
327 }
328
329 /* find the shared PE mapping for a given mapping */
330 static struct shared_map *get_shared_file( struct fd *fd )
331 {
332 struct shared_map *ptr;
333
334 LIST_FOR_EACH_ENTRY( ptr, &shared_map_list, struct shared_map, entry )
335 if (is_same_file_fd( ptr->fd, fd ))
336 return (struct shared_map *)grab_object( ptr );
337 return NULL;
338 }
339
340 /* return the size of the memory mapping and file range of a given section */
341 static inline void get_section_sizes( const IMAGE_SECTION_HEADER *sec, size_t *map_size,
342 off_t *file_start, size_t *file_size )
343 {
344 static const unsigned int sector_align = 0x1ff;
345
346 if (!sec->Misc.VirtualSize) *map_size = ROUND_SIZE( sec->SizeOfRawData );
347 else *map_size = ROUND_SIZE( sec->Misc.VirtualSize );
348
349 *file_start = sec->PointerToRawData & ~sector_align;
350 *file_size = (sec->SizeOfRawData + (sec->PointerToRawData & sector_align) + sector_align) & ~sector_align;
351 if (*file_size > *map_size) *file_size = *map_size;
352 }
353
354 /* add a range to the committed list */
355 static void add_committed_range( struct memory_view *view, file_pos_t start, file_pos_t end )
356 {
357 unsigned int i, j;
358 struct ranges *committed = view->committed;
359 struct range *ranges;
360
361 if ((start & page_mask) || (end & page_mask) ||
362 start >= view->size || end >= view->size ||
363 start >= end)
364 {
365 set_error( STATUS_INVALID_PARAMETER );
366 return;
367 }
368
369 if (!committed) return; /* everything committed already */
370
371 start += view->start;
372 end += view->start;
373
374 for (i = 0, ranges = committed->ranges; i < committed->count; i++)
375 {
376 if (ranges[i].start > end) break;
377 if (ranges[i].end < start) continue;
378 if (ranges[i].start > start) ranges[i].start = start; /* extend downwards */
379 if (ranges[i].end < end) /* extend upwards and maybe merge with next */
380 {
381 for (j = i + 1; j < committed->count; j++)
382 {
383 if (ranges[j].start > end) break;
384 if (ranges[j].end > end) end = ranges[j].end;
385 }
386 if (j > i + 1)
387 {
388 memmove( &ranges[i + 1], &ranges[j], (committed->count - j) * sizeof(*ranges) );
389 committed->count -= j - (i + 1);
390 }
391 ranges[i].end = end;
392 }
393 return;
394 }
395
396 /* now add a new range */
397
398 if (committed->count == committed->max)
399 {
400 unsigned int new_size = committed->max * 2;
401 struct range *new_ptr = realloc( committed->ranges, new_size * sizeof(*new_ptr) );
402 if (!new_ptr) return;
403 committed->max = new_size;
404 committed->ranges = new_ptr;
405 }
406 memmove( &ranges[i + 1], &ranges[i], (committed->count - i) * sizeof(*ranges) );
407 ranges[i].start = start;
408 ranges[i].end = end;
409 committed->count++;
410 }
411
412 /* find the range containing start and return whether it's committed */
413 static int find_committed_range( struct memory_view *view, file_pos_t start, mem_size_t *size )
414 {
415 unsigned int i;
416 struct ranges *committed = view->committed;
417 struct range *ranges;
418
419 if ((start & page_mask) || start >= view->size)
420 {
421 set_error( STATUS_INVALID_PARAMETER );
422 return 0;
423 }
424 if (!committed) /* everything is committed */
425 {
426 *size = view->size - start;
427 return 1;
428 }
429 for (i = 0, ranges = committed->ranges; i < committed->count; i++)
430 {
431 if (ranges[i].start > view->start + start)
432 {
433 *size = min( ranges[i].start, view->start + view->size ) - (view->start + start);
434 return 0;
435 }
436 if (ranges[i].end > view->start + start)
437 {
438 *size = min( ranges[i].end, view->start + view->size ) - (view->start + start);
439 return 1;
440 }
441 }
442 *size = view->size - start;
443 return 0;
444 }
445
446 /* allocate and fill the temp file for a shared PE image mapping */
447 static int build_shared_mapping( struct mapping *mapping, int fd,
448 IMAGE_SECTION_HEADER *sec, unsigned int nb_sec )
449 {
450 struct shared_map *shared;
451 struct file *file;
452 unsigned int i;
453 mem_size_t total_size;
454 size_t file_size, map_size, max_size;
455 off_t shared_pos, read_pos, write_pos;
456 char *buffer = NULL;
457 int shared_fd;
458 long toread;
459
460 /* compute the total size of the shared mapping */
461
462 total_size = max_size = 0;
463 for (i = 0; i < nb_sec; i++)
464 {
465 if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) &&
466 (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE))
467 {
468 get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
469 if (file_size > max_size) max_size = file_size;
470 total_size += map_size;
471 }
472 }
473 if (!total_size) return 1; /* nothing to do */
474
475 if ((mapping->shared = get_shared_file( mapping->fd ))) return 1;
476
477 /* create a temp file for the mapping */
478
479 if ((shared_fd = create_temp_file( total_size )) == -1) return 0;
480 if (!(file = create_file_for_fd( shared_fd, FILE_GENERIC_READ|FILE_GENERIC_WRITE, 0 ))) return 0;
481
482 if (!(buffer = malloc( max_size ))) goto error;
483
484 /* copy the shared sections data into the temp file */
485
486 shared_pos = 0;
487 for (i = 0; i < nb_sec; i++)
488 {
489 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue;
490 if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue;
491 get_section_sizes( &sec[i], &map_size, &read_pos, &file_size );
492 write_pos = shared_pos;
493 shared_pos += map_size;
494 if (!sec[i].PointerToRawData || !file_size) continue;
495 toread = file_size;
496 while (toread)
497 {
498 long res = pread( fd, buffer + file_size - toread, toread, read_pos );
499 if (!res && toread < 0x200) /* partial sector at EOF is not an error */
500 {
501 file_size -= toread;
502 break;
503 }
504 if (res <= 0) goto error;
505 toread -= res;
506 read_pos += res;
507 }
508 if (pwrite( shared_fd, buffer, file_size, write_pos ) != file_size) goto error;
509 }
510
511 if (!(shared = alloc_object( &shared_map_ops ))) goto error;
512 shared->fd = (struct fd *)grab_object( mapping->fd );
513 shared->file = file;
514 list_add_head( &shared_map_list, &shared->entry );
515 mapping->shared = shared;
516 free( buffer );
517 return 1;
518
519 error:
520 release_object( file );
521 free( buffer );
522 return 0;
523 }
524
525 /* retrieve the mapping parameters for an executable (PE) image */
526 static unsigned int get_image_params( struct mapping *mapping, file_pos_t file_size, int unix_fd )
527 {
528 IMAGE_DOS_HEADER dos;
529 IMAGE_SECTION_HEADER *sec = NULL;
530 struct
531 {
532 DWORD Signature;
533 IMAGE_FILE_HEADER FileHeader;
534 union
535 {
536 IMAGE_OPTIONAL_HEADER32 hdr32;
537 IMAGE_OPTIONAL_HEADER64 hdr64;
538 } opt;
539 } nt;
540 off_t pos;
541 int size;
542
543 /* load the headers */
544
545 if (!file_size) return STATUS_INVALID_FILE_FOR_SECTION;
546 if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) return STATUS_INVALID_IMAGE_NOT_MZ;
547 if (dos.e_magic != IMAGE_DOS_SIGNATURE) return STATUS_INVALID_IMAGE_NOT_MZ;
548 pos = dos.e_lfanew;
549
550 size = pread( unix_fd, &nt, sizeof(nt), pos );
551 if (size < sizeof(nt.Signature) + sizeof(nt.FileHeader)) return STATUS_INVALID_IMAGE_FORMAT;
552 /* zero out Optional header in the case it's not present or partial */
553 size = min( size, sizeof(nt.Signature) + sizeof(nt.FileHeader) + nt.FileHeader.SizeOfOptionalHeader );
554 if (size < sizeof(nt)) memset( (char *)&nt + size, 0, sizeof(nt) - size );
555 if (nt.Signature != IMAGE_NT_SIGNATURE)
556 {
557 if (*(WORD *)&nt.Signature == IMAGE_OS2_SIGNATURE) return STATUS_INVALID_IMAGE_NE_FORMAT;
558 return STATUS_INVALID_IMAGE_PROTECT;
559 }
560
561 mapping->cpu = current->process->cpu;
562 switch (mapping->cpu)
563 {
564 case CPU_x86:
565 if (nt.FileHeader.Machine != IMAGE_FILE_MACHINE_I386) return STATUS_INVALID_IMAGE_FORMAT;
566 if (nt.opt.hdr32.Magic != IMAGE_NT_OPTIONAL_HDR32_MAGIC) return STATUS_INVALID_IMAGE_FORMAT;
567 break;
568 case CPU_x86_64:
569 if (nt.FileHeader.Machine != IMAGE_FILE_MACHINE_AMD64) return STATUS_INVALID_IMAGE_FORMAT;
570 if (nt.opt.hdr64.Magic != IMAGE_NT_OPTIONAL_HDR64_MAGIC) return STATUS_INVALID_IMAGE_FORMAT;
571 break;
572 case CPU_POWERPC:
573 if (nt.FileHeader.Machine != IMAGE_FILE_MACHINE_POWERPC) return STATUS_INVALID_IMAGE_FORMAT;
574 if (nt.opt.hdr32.Magic != IMAGE_NT_OPTIONAL_HDR32_MAGIC) return STATUS_INVALID_IMAGE_FORMAT;
575 break;
576 case CPU_ARM:
577 if (nt.FileHeader.Machine != IMAGE_FILE_MACHINE_ARM &&
578 nt.FileHeader.Machine != IMAGE_FILE_MACHINE_THUMB &&
579 nt.FileHeader.Machine != IMAGE_FILE_MACHINE_ARMNT) return STATUS_INVALID_IMAGE_FORMAT;
580 if (nt.opt.hdr32.Magic != IMAGE_NT_OPTIONAL_HDR32_MAGIC) return STATUS_INVALID_IMAGE_FORMAT;
581 break;
582 case CPU_ARM64:
583 if (nt.FileHeader.Machine != IMAGE_FILE_MACHINE_ARM64) return STATUS_INVALID_IMAGE_FORMAT;
584 if (nt.opt.hdr64.Magic != IMAGE_NT_OPTIONAL_HDR64_MAGIC) return STATUS_INVALID_IMAGE_FORMAT;
585 break;
586 default:
587 return STATUS_INVALID_IMAGE_FORMAT;
588 }
589
590 switch (nt.opt.hdr32.Magic)
591 {
592 case IMAGE_NT_OPTIONAL_HDR32_MAGIC:
593 mapping->image.base = nt.opt.hdr32.ImageBase;
594 mapping->image.entry_point = nt.opt.hdr32.ImageBase + nt.opt.hdr32.AddressOfEntryPoint;
595 mapping->image.map_size = ROUND_SIZE( nt.opt.hdr32.SizeOfImage );
596 mapping->image.stack_size = nt.opt.hdr32.SizeOfStackReserve;
597 mapping->image.stack_commit = nt.opt.hdr32.SizeOfStackCommit;
598 mapping->image.subsystem = nt.opt.hdr32.Subsystem;
599 mapping->image.subsystem_low = nt.opt.hdr32.MinorSubsystemVersion;
600 mapping->image.subsystem_high = nt.opt.hdr32.MajorSubsystemVersion;
601 mapping->image.dll_charact = nt.opt.hdr32.DllCharacteristics;
602 mapping->image.loader_flags = nt.opt.hdr32.LoaderFlags;
603 mapping->image.header_size = nt.opt.hdr32.SizeOfHeaders;
604 mapping->image.checksum = nt.opt.hdr32.CheckSum;
605 break;
606 case IMAGE_NT_OPTIONAL_HDR64_MAGIC:
607 mapping->image.base = nt.opt.hdr64.ImageBase;
608 mapping->image.entry_point = nt.opt.hdr64.ImageBase + nt.opt.hdr64.AddressOfEntryPoint;
609 mapping->image.map_size = ROUND_SIZE( nt.opt.hdr64.SizeOfImage );
610 mapping->image.stack_size = nt.opt.hdr64.SizeOfStackReserve;
611 mapping->image.stack_commit = nt.opt.hdr64.SizeOfStackCommit;
612 mapping->image.subsystem = nt.opt.hdr64.Subsystem;
613 mapping->image.subsystem_low = nt.opt.hdr64.MinorSubsystemVersion;
614 mapping->image.subsystem_high = nt.opt.hdr64.MajorSubsystemVersion;
615 mapping->image.dll_charact = nt.opt.hdr64.DllCharacteristics;
616 mapping->image.loader_flags = nt.opt.hdr64.LoaderFlags;
617 mapping->image.header_size = nt.opt.hdr64.SizeOfHeaders;
618 mapping->image.checksum = nt.opt.hdr64.CheckSum;
619 break;
620 }
621 mapping->image.image_charact = nt.FileHeader.Characteristics;
622 mapping->image.machine = nt.FileHeader.Machine;
623 mapping->image.zerobits = 0; /* FIXME */
624 mapping->image.gp = 0; /* FIXME */
625 mapping->image.contains_code = 0; /* FIXME */
626 mapping->image.image_flags = 0; /* FIXME */
627 mapping->image.file_size = file_size;
628
629 /* load the section headers */
630
631 pos += sizeof(nt.Signature) + sizeof(nt.FileHeader) + nt.FileHeader.SizeOfOptionalHeader;
632 size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
633 if (!mapping->size) mapping->size = mapping->image.map_size;
634 else if (mapping->size > mapping->image.map_size) return STATUS_SECTION_TOO_BIG;
635 if (pos + size > mapping->image.map_size) return STATUS_INVALID_FILE_FOR_SECTION;
636 if (pos + size > mapping->image.header_size) mapping->image.header_size = pos + size;
637 if (!(sec = malloc( size ))) goto error;
638 if (pread( unix_fd, sec, size, pos ) != size) goto error;
639
640 if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error;
641
642 free( sec );
643 return 0;
644
645 error:
646 free( sec );
647 return STATUS_INVALID_FILE_FOR_SECTION;
648 }
649
650 static struct ranges *create_ranges(void)
651 {
652 struct ranges *ranges = alloc_object( &ranges_ops );
653
654 if (!ranges) return NULL;
655 ranges->count = 0;
656 ranges->max = 8;
657 if (!(ranges->ranges = mem_alloc( ranges->max * sizeof(*ranges->ranges) )))
658 {
659 release_object( ranges );
660 return NULL;
661 }
662 return ranges;
663 }
664
665 static unsigned int get_mapping_flags( obj_handle_t handle, unsigned int flags )
666 {
667 switch (flags & (SEC_IMAGE | SEC_RESERVE | SEC_COMMIT | SEC_FILE))
668 {
669 case SEC_IMAGE:
670 if (flags & (SEC_WRITECOMBINE | SEC_LARGE_PAGES)) break;
671 if (handle) return SEC_FILE | SEC_IMAGE;
672 set_error( STATUS_INVALID_FILE_FOR_SECTION );
673 return 0;
674 case SEC_COMMIT:
675 if (!handle) return flags;
676 /* fall through */
677 case SEC_RESERVE:
678 if (flags & SEC_LARGE_PAGES) break;
679 if (handle) return SEC_FILE | (flags & (SEC_NOCACHE | SEC_WRITECOMBINE));
680 return flags;
681 }
682 set_error( STATUS_INVALID_PARAMETER );
683 return 0;
684 }
685
686
687 static struct object *create_mapping( struct object *root, const struct unicode_str *name,
688 unsigned int attr, mem_size_t size, unsigned int flags,
689 obj_handle_t handle, unsigned int file_access,
690 const struct security_descriptor *sd )
691 {
692 struct mapping *mapping;
693 struct file *file;
694 struct fd *fd;
695 int unix_fd;
696 struct stat st;
697
698 if (!page_mask) page_mask = sysconf( _SC_PAGESIZE ) - 1;
699
700 if (!(mapping = create_named_object( root, &mapping_ops, name, attr, sd )))
701 return NULL;
702 if (get_error() == STATUS_OBJECT_NAME_EXISTS)
703 return &mapping->obj; /* Nothing else to do */
704
705 mapping->size = size;
706 mapping->fd = NULL;
707 mapping->shared = NULL;
708 mapping->committed = NULL;
709
710 if (!(mapping->flags = get_mapping_flags( handle, flags ))) goto error;
711
712 if (handle)
713 {
714 const unsigned int sharing = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
715 unsigned int mapping_access = FILE_MAPPING_ACCESS;
716
717 if (!(file = get_file_obj( current->process, handle, file_access ))) goto error;
718 fd = get_obj_fd( (struct object *)file );
719
720 /* file sharing rules for mappings are different so we use magic the access rights */
721 if (flags & SEC_IMAGE) mapping_access |= FILE_MAPPING_IMAGE;
722 else if (file_access & FILE_WRITE_DATA) mapping_access |= FILE_MAPPING_WRITE;
723
724 if (!(mapping->fd = get_fd_object_for_mapping( fd, mapping_access, sharing )))
725 {
726 mapping->fd = dup_fd_object( fd, mapping_access, sharing, FILE_SYNCHRONOUS_IO_NONALERT );
727 if (mapping->fd) set_fd_user( mapping->fd, &mapping_fd_ops, NULL );
728 }
729 release_object( file );
730 release_object( fd );
731 if (!mapping->fd) goto error;
732
733 if ((unix_fd = get_unix_fd( mapping->fd )) == -1) goto error;
734 if (fstat( unix_fd, &st ) == -1)
735 {
736 file_set_error();
737 goto error;
738 }
739 if (flags & SEC_IMAGE)
740 {
741 unsigned int err = get_image_params( mapping, st.st_size, unix_fd );
742 if (!err) return &mapping->obj;
743 set_error( err );
744 goto error;
745 }
746 if (!mapping->size)
747 {
748 if (!(mapping->size = st.st_size))
749 {
750 set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
751 goto error;
752 }
753 }
754 else if (st.st_size < mapping->size)
755 {
756 if (!(file_access & FILE_WRITE_DATA))
757 {
758 set_error( STATUS_SECTION_TOO_BIG );
759 goto error;
760 }
761 if (!grow_file( unix_fd, mapping->size )) goto error;
762 }
763 }
764 else /* Anonymous mapping (no associated file) */
765 {
766 if (!mapping->size)
767 {
768 set_error( STATUS_INVALID_PARAMETER );
769 goto error;
770 }
771 if ((flags & SEC_RESERVE) && !(mapping->committed = create_ranges())) goto error;
772 mapping->size = (mapping->size + page_mask) & ~((mem_size_t)page_mask);
773 if ((unix_fd = create_temp_file( mapping->size )) == -1) goto error;
774 if (!(mapping->fd = create_anonymous_fd( &mapping_fd_ops, unix_fd, &mapping->obj,
775 FILE_SYNCHRONOUS_IO_NONALERT ))) goto error;
776 allow_fd_caching( mapping->fd );
777 }
778 return &mapping->obj;
779
780 error:
781 release_object( mapping );
782 return NULL;
783 }
784
785 struct mapping *get_mapping_obj( struct process *process, obj_handle_t handle, unsigned int access )
786 {
787 return (struct mapping *)get_handle_obj( process, handle, access, &mapping_ops );
788 }
789
790 /* open a new file for the file descriptor backing the mapping */
791 struct file *get_mapping_file( struct process *process, client_ptr_t base,
792 unsigned int access, unsigned int sharing )
793 {
794 struct memory_view *view = find_mapped_view( process, base );
795
796 if (!view || !view->fd) return NULL;
797 return create_file_for_fd_obj( view->fd, access, sharing );
798 }
799
800 static void mapping_dump( struct object *obj, int verbose )
801 {
802 struct mapping *mapping = (struct mapping *)obj;
803 assert( obj->ops == &mapping_ops );
804 fprintf( stderr, "Mapping size=%08x%08x flags=%08x fd=%p shared=%p\n",
805 (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
806 mapping->flags, mapping->fd, mapping->shared );
807 }
808
809 static struct object_type *mapping_get_type( struct object *obj )
810 {
811 static const WCHAR name[] = {'S','e','c','t','i','o','n'};
812 static const struct unicode_str str = { name, sizeof(name) };
813 return get_object_type( &str );
814 }
815
816 static struct fd *mapping_get_fd( struct object *obj )
817 {
818 struct mapping *mapping = (struct mapping *)obj;
819 return (struct fd *)grab_object( mapping->fd );
820 }
821
822 static unsigned int mapping_map_access( struct object *obj, unsigned int access )
823 {
824 if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | SECTION_QUERY | SECTION_MAP_READ;
825 if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE | SECTION_MAP_WRITE;
826 if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SECTION_MAP_EXECUTE;
827 if (access & GENERIC_ALL) access |= SECTION_ALL_ACCESS;
828 return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
829 }
830
831 static void mapping_destroy( struct object *obj )
832 {
833 struct mapping *mapping = (struct mapping *)obj;
834 assert( obj->ops == &mapping_ops );
835 if (mapping->fd) release_object( mapping->fd );
836 if (mapping->committed) release_object( mapping->committed );
837 if (mapping->shared) release_object( mapping->shared );
838 }
839
840 static enum server_fd_type mapping_get_fd_type( struct fd *fd )
841 {
842 return FD_TYPE_FILE;
843 }
844
845 int get_page_size(void)
846 {
847 if (!page_mask) page_mask = sysconf( _SC_PAGESIZE ) - 1;
848 return page_mask + 1;
849 }
850
851 /* create a file mapping */
852 DECL_HANDLER(create_mapping)
853 {
854 struct object *root, *obj;
855 struct unicode_str name;
856 const struct security_descriptor *sd;
857 const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, &root );
858
859 if (!objattr) return;
860
861 if ((obj = create_mapping( root, &name, objattr->attributes, req->size, req->flags,
862 req->file_handle, req->file_access, sd )))
863 {
864 if (get_error() == STATUS_OBJECT_NAME_EXISTS)
865 reply->handle = alloc_handle( current->process, obj, req->access, objattr->attributes );
866 else
867 reply->handle = alloc_handle_no_access_check( current->process, obj,
868 req->access, objattr->attributes );
869 release_object( obj );
870 }
871
872 if (root) release_object( root );
873 }
874
875 /* open a handle to a mapping */
876 DECL_HANDLER(open_mapping)
877 {
878 struct unicode_str name = get_req_unicode_str();
879
880 reply->handle = open_object( current->process, req->rootdir, req->access,
881 &mapping_ops, &name, req->attributes );
882 }
883
884 /* get a mapping information */
885 DECL_HANDLER(get_mapping_info)
886 {
887 struct mapping *mapping;
888
889 if (!(mapping = get_mapping_obj( current->process, req->handle, req->access ))) return;
890
891 reply->size = mapping->size;
892 reply->flags = mapping->flags;
893
894 if (mapping->flags & SEC_IMAGE)
895 set_reply_data( &mapping->image, min( sizeof(mapping->image), get_reply_max_size() ));
896
897 if (!(req->access & (SECTION_MAP_READ | SECTION_MAP_WRITE))) /* query only */
898 {
899 release_object( mapping );
900 return;
901 }
902
903 if ((mapping->flags & SEC_IMAGE) && mapping->cpu != current->process->cpu)
904 {
905 set_error( STATUS_INVALID_IMAGE_FORMAT );
906 release_object( mapping );
907 return;
908 }
909
910 if (mapping->shared)
911 reply->shared_file = alloc_handle( current->process, mapping->shared->file,
912 GENERIC_READ|GENERIC_WRITE, 0 );
913 release_object( mapping );
914 }
915
916 /* add a memory view in the current process */
917 DECL_HANDLER(map_view)
918 {
919 struct mapping *mapping = NULL;
920 struct memory_view *view;
921
922 if (!req->size || (req->base & page_mask) || req->base + req->size < req->base) /* overflow */
923 {
924 set_error( STATUS_INVALID_PARAMETER );
925 return;
926 }
927
928 /* make sure we don't already have an overlapping view */
929 LIST_FOR_EACH_ENTRY( view, &current->process->views, struct memory_view, entry )
930 {
931 if (view->base + view->size <= req->base) continue;
932 if (view->base >= req->base + req->size) continue;
933 set_error( STATUS_INVALID_PARAMETER );
934 return;
935 }
936
937 if (!(mapping = get_mapping_obj( current->process, req->mapping, req->access ))) return;
938
939 if (mapping->flags & SEC_IMAGE)
940 {
941 if (req->start || req->size > mapping->image.map_size)
942 {
943 set_error( STATUS_INVALID_PARAMETER );
944 goto done;
945 }
946 }
947 else if (req->start >= mapping->size ||
948 req->start + req->size < req->start ||
949 req->start + req->size > ((mapping->size + page_mask) & ~(mem_size_t)page_mask))
950 {
951 set_error( STATUS_INVALID_PARAMETER );
952 goto done;
953 }
954
955 if ((view = mem_alloc( sizeof(*view) )))
956 {
957 view->base = req->base;
958 view->size = req->size;
959 view->start = req->start;
960 view->flags = mapping->flags;
961 view->fd = !is_fd_removable( mapping->fd ) ? (struct fd *)grab_object( mapping->fd ) : NULL;
962 view->committed = mapping->committed ? (struct ranges *)grab_object( mapping->committed ) : NULL;
963 view->shared = mapping->shared ? (struct shared_map *)grab_object( mapping->shared ) : NULL;
964 list_add_tail( &current->process->views, &view->entry );
965 }
966
967 done:
968 release_object( mapping );
969 }
970
971 /* unmap a memory view from the current process */
972 DECL_HANDLER(unmap_view)
973 {
974 struct memory_view *view = find_mapped_view( current->process, req->base );
975
976 if (view) free_memory_view( view );
977 }
978
979 /* get a range of committed pages in a file mapping */
980 DECL_HANDLER(get_mapping_committed_range)
981 {
982 struct memory_view *view = find_mapped_view( current->process, req->base );
983
984 if (view) reply->committed = find_committed_range( view, req->offset, &reply->size );
985 }
986
987 /* add a range to the committed pages in a file mapping */
988 DECL_HANDLER(add_mapping_committed_range)
989 {
990 struct memory_view *view = find_mapped_view( current->process, req->base );
991
992 if (view) add_committed_range( view, req->offset, req->offset + req->size );
993 }
994
995 /* check if two memory maps are for the same file */
996 DECL_HANDLER(is_same_mapping)
997 {
998 struct memory_view *view1 = find_mapped_view( current->process, req->base1 );
999 struct memory_view *view2 = find_mapped_view( current->process, req->base2 );
1000
1001 if (!view1 || !view2) return;
1002 if (!view1->fd || !view2->fd ||
1003 !(view1->flags & SEC_IMAGE) || !(view2->flags & SEC_IMAGE) ||
1004 !is_same_file_fd( view1->fd, view2->fd ))
1005 set_error( STATUS_NOT_SAME_DEVICE );
1006 }
Windows API implementation