| /* |
| * Server-side file mapping management |
| * |
| * Copyright (C) 1999 Alexandre Julliard |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA |
| */ |
| |
| #include "config.h" |
| #include "wine/port.h" |
| |
| #include <assert.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/stat.h> |
| #include <unistd.h> |
| |
| #include "ntstatus.h" |
| #define WIN32_NO_STATUS |
| #include "windef.h" |
| #include "winternl.h" |
| |
| #include "file.h" |
| #include "handle.h" |
| #include "thread.h" |
| #include "request.h" |
| |
| struct mapping |
| { |
| struct object obj; /* object header */ |
| file_pos_t size; /* mapping size */ |
| int protect; /* protection flags */ |
| struct file *file; /* file mapped */ |
| int header_size; /* size of headers (for PE image mapping) */ |
| void *base; /* default base addr (for PE image mapping) */ |
| struct file *shared_file; /* temp file for shared PE mapping */ |
| struct list shared_entry; /* entry in global shared PE mappings list */ |
| }; |
| |
| static void mapping_dump( struct object *obj, int verbose ); |
| static struct fd *mapping_get_fd( struct object *obj ); |
| static unsigned int mapping_map_access( struct object *obj, unsigned int access ); |
| static void mapping_destroy( struct object *obj ); |
| |
| static const struct object_ops mapping_ops = |
| { |
| sizeof(struct mapping), /* size */ |
| mapping_dump, /* dump */ |
| no_add_queue, /* add_queue */ |
| NULL, /* remove_queue */ |
| NULL, /* signaled */ |
| NULL, /* satisfied */ |
| no_signal, /* signal */ |
| mapping_get_fd, /* get_fd */ |
| mapping_map_access, /* map_access */ |
| default_get_sd, /* get_sd */ |
| default_set_sd, /* set_sd */ |
| no_lookup_name, /* lookup_name */ |
| no_open_file, /* open_file */ |
| fd_close_handle, /* close_handle */ |
| mapping_destroy /* destroy */ |
| }; |
| |
| static struct list shared_list = LIST_INIT(shared_list); |
| |
| #ifdef __i386__ |
| |
| /* These are always the same on an i386, and it will be faster this way */ |
| # define page_mask 0xfff |
| # define page_shift 12 |
| # define init_page_size() do { /* nothing */ } while(0) |
| |
| #else /* __i386__ */ |
| |
| static int page_shift, page_mask; |
| |
| static void init_page_size(void) |
| { |
| int page_size; |
| # ifdef HAVE_GETPAGESIZE |
| page_size = getpagesize(); |
| # else |
| # ifdef __svr4__ |
| page_size = sysconf(_SC_PAGESIZE); |
| # else |
| # error Cannot get the page size on this platform |
| # endif |
| # endif |
| page_mask = page_size - 1; |
| /* Make sure we have a power of 2 */ |
| assert( !(page_size & page_mask) ); |
| page_shift = 0; |
| while ((1 << page_shift) != page_size) page_shift++; |
| } |
| #endif /* __i386__ */ |
| |
| #define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask) |
| |
| |
| /* find the shared PE mapping for a given mapping */ |
| static struct file *get_shared_file( struct mapping *mapping ) |
| { |
| struct mapping *ptr; |
| |
| LIST_FOR_EACH_ENTRY( ptr, &shared_list, struct mapping, shared_entry ) |
| if (is_same_file( ptr->file, mapping->file )) |
| return (struct file *)grab_object( ptr->shared_file ); |
| return NULL; |
| } |
| |
| /* return the size of the memory mapping and file range of a given section */ |
| static inline void get_section_sizes( const IMAGE_SECTION_HEADER *sec, size_t *map_size, |
| off_t *file_start, size_t *file_size ) |
| { |
| static const unsigned int sector_align = 0x1ff; |
| |
| if (!sec->Misc.VirtualSize) *map_size = ROUND_SIZE( sec->SizeOfRawData ); |
| else *map_size = ROUND_SIZE( sec->Misc.VirtualSize ); |
| |
| *file_start = sec->PointerToRawData & ~sector_align; |
| *file_size = (sec->SizeOfRawData + (sec->PointerToRawData & sector_align) + sector_align) & ~sector_align; |
| if (*file_size > *map_size) *file_size = *map_size; |
| } |
| |
| /* allocate and fill the temp file for a shared PE image mapping */ |
| static int build_shared_mapping( struct mapping *mapping, int fd, |
| IMAGE_SECTION_HEADER *sec, unsigned int nb_sec ) |
| { |
| unsigned int i; |
| file_pos_t total_size; |
| size_t file_size, map_size, max_size; |
| off_t shared_pos, read_pos, write_pos; |
| char *buffer = NULL; |
| int shared_fd; |
| long toread; |
| |
| /* compute the total size of the shared mapping */ |
| |
| total_size = max_size = 0; |
| for (i = 0; i < nb_sec; i++) |
| { |
| if ((sec[i].Characteristics & IMAGE_SCN_MEM_SHARED) && |
| (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) |
| { |
| get_section_sizes( &sec[i], &map_size, &read_pos, &file_size ); |
| if (file_size > max_size) max_size = file_size; |
| total_size += map_size; |
| } |
| } |
| if (!total_size) return 1; /* nothing to do */ |
| |
| if ((mapping->shared_file = get_shared_file( mapping ))) return 1; |
| |
| /* create a temp file for the mapping */ |
| |
| if (!(mapping->shared_file = create_temp_file( FILE_GENERIC_READ|FILE_GENERIC_WRITE ))) return 0; |
| if (!grow_file( mapping->shared_file, total_size )) goto error; |
| if ((shared_fd = get_file_unix_fd( mapping->shared_file )) == -1) goto error; |
| |
| if (!(buffer = malloc( max_size ))) goto error; |
| |
| /* copy the shared sections data into the temp file */ |
| |
| shared_pos = 0; |
| for (i = 0; i < nb_sec; i++) |
| { |
| if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue; |
| if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue; |
| get_section_sizes( &sec[i], &map_size, &read_pos, &file_size ); |
| write_pos = shared_pos; |
| shared_pos += map_size; |
| if (!sec[i].PointerToRawData || !file_size) continue; |
| toread = file_size; |
| while (toread) |
| { |
| long res = pread( fd, buffer + file_size - toread, toread, read_pos ); |
| if (!res && toread < 0x200) /* partial sector at EOF is not an error */ |
| { |
| file_size -= toread; |
| break; |
| } |
| if (res <= 0) goto error; |
| toread -= res; |
| read_pos += res; |
| } |
| if (pwrite( shared_fd, buffer, file_size, write_pos ) != file_size) goto error; |
| } |
| free( buffer ); |
| return 1; |
| |
| error: |
| release_object( mapping->shared_file ); |
| mapping->shared_file = NULL; |
| free( buffer ); |
| return 0; |
| } |
| |
| /* retrieve the mapping parameters for an executable (PE) image */ |
| static int get_image_params( struct mapping *mapping ) |
| { |
| IMAGE_DOS_HEADER dos; |
| IMAGE_NT_HEADERS nt; |
| IMAGE_SECTION_HEADER *sec = NULL; |
| struct fd *fd; |
| off_t pos; |
| int unix_fd, size, toread; |
| |
| /* load the headers */ |
| |
| if (!(fd = mapping_get_fd( &mapping->obj ))) return 0; |
| if ((unix_fd = get_unix_fd( fd )) == -1) goto error; |
| if (pread( unix_fd, &dos, sizeof(dos), 0 ) != sizeof(dos)) goto error; |
| if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error; |
| pos = dos.e_lfanew; |
| |
| if (pread( unix_fd, &nt.Signature, sizeof(nt.Signature), pos ) != sizeof(nt.Signature)) |
| goto error; |
| pos += sizeof(nt.Signature); |
| if (nt.Signature != IMAGE_NT_SIGNATURE) goto error; |
| if (pread( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader), pos ) != sizeof(nt.FileHeader)) |
| goto error; |
| pos += sizeof(nt.FileHeader); |
| /* zero out Optional header in the case it's not present or partial */ |
| memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader)); |
| toread = min( sizeof(nt.OptionalHeader), nt.FileHeader.SizeOfOptionalHeader ); |
| if (pread( unix_fd, &nt.OptionalHeader, toread, pos ) != toread) goto error; |
| pos += nt.FileHeader.SizeOfOptionalHeader; |
| |
| /* load the section headers */ |
| |
| size = sizeof(*sec) * nt.FileHeader.NumberOfSections; |
| if (!(sec = malloc( size ))) goto error; |
| if (pread( unix_fd, sec, size, pos ) != size) goto error; |
| |
| if (!build_shared_mapping( mapping, unix_fd, sec, nt.FileHeader.NumberOfSections )) goto error; |
| |
| if (mapping->shared_file) list_add_head( &shared_list, &mapping->shared_entry ); |
| |
| mapping->size = ROUND_SIZE( nt.OptionalHeader.SizeOfImage ); |
| mapping->base = (void *)nt.OptionalHeader.ImageBase; |
| mapping->header_size = max( pos + size, nt.OptionalHeader.SizeOfHeaders ); |
| mapping->protect = VPROT_IMAGE; |
| |
| /* sanity check */ |
| if (pos + size > mapping->size) goto error; |
| |
| free( sec ); |
| release_object( fd ); |
| return 1; |
| |
| error: |
| free( sec ); |
| release_object( fd ); |
| set_error( STATUS_INVALID_FILE_FOR_SECTION ); |
| return 0; |
| } |
| |
| /* get the size of the unix file associated with the mapping */ |
| static inline int get_file_size( struct file *file, file_pos_t *size ) |
| { |
| struct stat st; |
| int unix_fd = get_file_unix_fd( file ); |
| |
| if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 0; |
| *size = st.st_size; |
| return 1; |
| } |
| |
| static struct object *create_mapping( struct directory *root, const struct unicode_str *name, |
| unsigned int attr, file_pos_t size, int protect, |
| obj_handle_t handle ) |
| { |
| struct mapping *mapping; |
| int access = 0; |
| |
| if (!page_mask) init_page_size(); |
| |
| if (!(mapping = create_named_object_dir( root, name, attr, &mapping_ops ))) |
| return NULL; |
| if (get_error() == STATUS_OBJECT_NAME_EXISTS) |
| return &mapping->obj; /* Nothing else to do */ |
| |
| mapping->header_size = 0; |
| mapping->base = NULL; |
| mapping->shared_file = NULL; |
| |
| if (protect & VPROT_READ) access |= FILE_READ_DATA; |
| if (protect & VPROT_WRITE) access |= FILE_WRITE_DATA; |
| |
| if (handle) |
| { |
| if (!(mapping->file = get_file_obj( current->process, handle, access ))) goto error; |
| if (protect & VPROT_IMAGE) |
| { |
| if (!get_image_params( mapping )) goto error; |
| return &mapping->obj; |
| } |
| if (!size) |
| { |
| if (!get_file_size( mapping->file, &size )) goto error; |
| if (!size) |
| { |
| set_error( STATUS_MAPPED_FILE_SIZE_ZERO ); |
| goto error; |
| } |
| } |
| else |
| { |
| if (!grow_file( mapping->file, size )) goto error; |
| } |
| } |
| else /* Anonymous mapping (no associated file) */ |
| { |
| if (!size || (protect & VPROT_IMAGE)) |
| { |
| set_error( STATUS_INVALID_PARAMETER ); |
| mapping->file = NULL; |
| goto error; |
| } |
| if (!(mapping->file = create_temp_file( access ))) goto error; |
| if (!grow_file( mapping->file, size )) goto error; |
| } |
| mapping->size = (size + page_mask) & ~((file_pos_t)page_mask); |
| mapping->protect = protect; |
| return &mapping->obj; |
| |
| error: |
| release_object( mapping ); |
| return NULL; |
| } |
| |
| static void mapping_dump( struct object *obj, int verbose ) |
| { |
| struct mapping *mapping = (struct mapping *)obj; |
| assert( obj->ops == &mapping_ops ); |
| fprintf( stderr, "Mapping size=%08x%08x prot=%08x file=%p header_size=%08x base=%p " |
| "shared_file=%p ", |
| (unsigned int)(mapping->size >> 32), (unsigned int)mapping->size, |
| mapping->protect, mapping->file, mapping->header_size, |
| mapping->base, mapping->shared_file ); |
| dump_object_name( &mapping->obj ); |
| fputc( '\n', stderr ); |
| } |
| |
| static struct fd *mapping_get_fd( struct object *obj ) |
| { |
| struct mapping *mapping = (struct mapping *)obj; |
| return get_obj_fd( (struct object *)mapping->file ); |
| } |
| |
| static unsigned int mapping_map_access( struct object *obj, unsigned int access ) |
| { |
| if (access & GENERIC_READ) access |= STANDARD_RIGHTS_READ | SECTION_QUERY | SECTION_MAP_READ; |
| if (access & GENERIC_WRITE) access |= STANDARD_RIGHTS_WRITE | SECTION_MAP_WRITE; |
| if (access & GENERIC_EXECUTE) access |= STANDARD_RIGHTS_EXECUTE | SECTION_MAP_EXECUTE; |
| if (access & GENERIC_ALL) access |= SECTION_ALL_ACCESS; |
| return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL); |
| } |
| |
| static void mapping_destroy( struct object *obj ) |
| { |
| struct mapping *mapping = (struct mapping *)obj; |
| assert( obj->ops == &mapping_ops ); |
| if (mapping->file) release_object( mapping->file ); |
| if (mapping->shared_file) |
| { |
| release_object( mapping->shared_file ); |
| list_remove( &mapping->shared_entry ); |
| } |
| } |
| |
| int get_page_size(void) |
| { |
| if (!page_mask) init_page_size(); |
| return page_mask + 1; |
| } |
| |
| /* create a file mapping */ |
| DECL_HANDLER(create_mapping) |
| { |
| struct object *obj; |
| struct unicode_str name; |
| struct directory *root = NULL; |
| |
| reply->handle = 0; |
| get_req_unicode_str( &name ); |
| if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 ))) |
| return; |
| |
| if ((obj = create_mapping( root, &name, req->attributes, req->size, req->protect, req->file_handle ))) |
| { |
| reply->handle = alloc_handle( current->process, obj, req->access, req->attributes ); |
| release_object( obj ); |
| } |
| |
| if (root) release_object( root ); |
| } |
| |
| /* open a handle to a mapping */ |
| DECL_HANDLER(open_mapping) |
| { |
| struct unicode_str name; |
| struct directory *root = NULL; |
| struct mapping *mapping; |
| |
| get_req_unicode_str( &name ); |
| if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 ))) |
| return; |
| |
| if ((mapping = open_object_dir( root, &name, req->attributes, &mapping_ops ))) |
| { |
| reply->handle = alloc_handle( current->process, &mapping->obj, req->access, req->attributes ); |
| release_object( mapping ); |
| } |
| |
| if (root) release_object( root ); |
| } |
| |
| /* get a mapping information */ |
| DECL_HANDLER(get_mapping_info) |
| { |
| struct mapping *mapping; |
| struct fd *fd; |
| |
| if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle, |
| 0, &mapping_ops ))) |
| { |
| reply->size = mapping->size; |
| reply->protect = mapping->protect; |
| reply->header_size = mapping->header_size; |
| reply->base = mapping->base; |
| reply->shared_file = 0; |
| if ((fd = get_obj_fd( &mapping->obj ))) |
| { |
| if (!is_fd_removable(fd)) |
| reply->mapping = alloc_handle( current->process, mapping, 0, 0 ); |
| release_object( fd ); |
| } |
| if (mapping->shared_file) |
| { |
| if (!(reply->shared_file = alloc_handle( current->process, mapping->shared_file, |
| GENERIC_READ|GENERIC_WRITE, 0 ))) |
| { |
| if (reply->mapping) close_handle( current->process, reply->mapping ); |
| } |
| } |
| release_object( mapping ); |
| } |
| } |
