| /* |
| * Server-side file mapping management |
| * |
| * Copyright (C) 1999 Alexandre Julliard |
| */ |
| |
| #include <assert.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| |
| #include "config.h" |
| #include "winnt.h" |
| #include "winbase.h" |
| |
| #include "handle.h" |
| #include "thread.h" |
| #include "request.h" |
| |
| struct mapping |
| { |
| struct object obj; /* object header */ |
| int size_high; /* mapping size */ |
| int size_low; /* 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 */ |
| int shared_size; /* shared mapping total size */ |
| struct mapping *shared_next; /* next in shared PE mapping list */ |
| struct mapping *shared_prev; /* prev in shared PE mapping list */ |
| }; |
| |
| static int mapping_get_fd( struct object *obj ); |
| static void mapping_dump( struct object *obj, int verbose ); |
| 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 */ |
| NULL, /* get_poll_events */ |
| NULL, /* poll_event */ |
| mapping_get_fd, /* get_fd */ |
| no_flush, /* flush */ |
| no_get_file_info, /* get_file_info */ |
| mapping_destroy /* destroy */ |
| }; |
| |
| static struct mapping *shared_first; |
| |
| #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_ADDR(addr) \ |
| ((int)(addr) & ~page_mask) |
| |
| #define ROUND_SIZE(addr,size) \ |
| (((int)(size) + ((int)(addr) & page_mask) + page_mask) & ~page_mask) |
| |
| /* get the fd to use for mmaping a file */ |
| inline static int get_mmap_fd( struct file *file ) |
| { |
| struct object *obj; |
| if (!(obj = (struct object *)file)) |
| { |
| set_error( STATUS_INVALID_HANDLE ); |
| return -1; |
| } |
| return obj->ops->get_fd( obj ); |
| } |
| |
| /* find the shared PE mapping for a given mapping */ |
| static struct file *get_shared_file( struct mapping *mapping ) |
| { |
| struct mapping *ptr; |
| |
| for (ptr = shared_first; ptr; ptr = ptr->shared_next) |
| if (is_same_file( ptr->file, mapping->file )) |
| return (struct file *)grab_object( ptr->shared_file ); |
| return NULL; |
| } |
| |
| /* 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, int nb_sec ) |
| { |
| int i, max_size, total_size, 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)) |
| { |
| int size = ROUND_SIZE( 0, sec[i].Misc.VirtualSize ); |
| if (size > max_size) max_size = size; |
| total_size += size; |
| } |
| } |
| if (!(mapping->shared_size = 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( GENERIC_READ|GENERIC_WRITE ))) goto error; |
| if (!grow_file( mapping->shared_file, 0, total_size )) goto error; |
| if ((shared_fd = get_mmap_fd( mapping->shared_file )) == -1) goto error; |
| |
| if (!(buffer = malloc( max_size ))) goto error; |
| |
| /* copy the shared sections data into the temp file */ |
| |
| for (i = pos = 0; i < nb_sec; i++) |
| { |
| if (!(sec[i].Characteristics & IMAGE_SCN_MEM_SHARED)) continue; |
| if (!(sec[i].Characteristics & IMAGE_SCN_MEM_WRITE)) continue; |
| if (lseek( shared_fd, pos, SEEK_SET ) != pos) goto error; |
| pos += ROUND_SIZE( 0, sec[i].Misc.VirtualSize ); |
| if (sec[i].Characteristics & IMAGE_SCN_CNT_UNINITIALIZED_DATA) continue; |
| if (!sec[i].PointerToRawData || !sec[i].SizeOfRawData) continue; |
| if (lseek( fd, sec[i].PointerToRawData, SEEK_SET ) != sec[i].PointerToRawData) goto error; |
| toread = sec[i].SizeOfRawData; |
| while (toread) |
| { |
| long res = read( fd, buffer + sec[i].SizeOfRawData - toread, toread ); |
| if (res <= 0) goto error; |
| toread -= res; |
| } |
| if (write( shared_fd, buffer, sec[i].SizeOfRawData ) != sec[i].SizeOfRawData) goto error; |
| } |
| free( buffer ); |
| return 1; |
| |
| error: |
| if (buffer) 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; |
| int fd, filepos, size; |
| |
| /* load the headers */ |
| |
| if ((fd = get_mmap_fd( mapping->file )) == -1) return 0; |
| filepos = lseek( fd, 0, SEEK_SET ); |
| if (read( fd, &dos, sizeof(dos) ) != sizeof(dos)) goto error; |
| if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error; |
| if (lseek( fd, dos.e_lfanew, SEEK_SET ) == -1) goto error; |
| if (read( fd, &nt, sizeof(nt) ) != sizeof(nt)) goto error; |
| if (nt.Signature != IMAGE_NT_SIGNATURE) goto error; |
| |
| /* load the section headers */ |
| |
| size = sizeof(*sec) * nt.FileHeader.NumberOfSections; |
| if (!(sec = malloc( size ))) goto error; |
| if (read( fd, sec, size ) != size) goto error; |
| |
| if (!build_shared_mapping( mapping, fd, sec, nt.FileHeader.NumberOfSections )) goto error; |
| |
| if (mapping->shared_file) /* link it in the list */ |
| { |
| if ((mapping->shared_next = shared_first)) shared_first->shared_prev = mapping; |
| mapping->shared_prev = NULL; |
| shared_first = mapping; |
| } |
| |
| mapping->size_low = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage ); |
| mapping->size_high = 0; |
| mapping->base = (void *)nt.OptionalHeader.ImageBase; |
| mapping->header_size = ROUND_SIZE( mapping->base, nt.OptionalHeader.SizeOfHeaders ); |
| mapping->protect = VPROT_IMAGE; |
| |
| /* sanity check */ |
| if (mapping->header_size > mapping->size_low) goto error; |
| |
| lseek( fd, filepos, SEEK_SET ); |
| free( sec ); |
| return 1; |
| |
| error: |
| lseek( fd, filepos, SEEK_SET ); |
| if (sec) free( sec ); |
| set_error( STATUS_INVALID_FILE_FOR_SECTION ); |
| return 0; |
| } |
| |
| |
| static struct object *create_mapping( int size_high, int size_low, int protect, |
| handle_t handle, const WCHAR *name, size_t len ) |
| { |
| struct mapping *mapping; |
| int access = 0; |
| |
| if (!page_mask) init_page_size(); |
| |
| if (!(mapping = create_named_object( &mapping_ops, name, len ))) |
| return NULL; |
| if (get_error() == STATUS_OBJECT_NAME_COLLISION) |
| return &mapping->obj; /* Nothing else to do */ |
| |
| mapping->header_size = 0; |
| mapping->base = NULL; |
| mapping->shared_file = NULL; |
| mapping->shared_size = 0; |
| |
| if (protect & VPROT_READ) access |= GENERIC_READ; |
| if (protect & VPROT_WRITE) access |= GENERIC_WRITE; |
| |
| 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_high && !size_low) |
| { |
| struct get_file_info_request req; |
| struct object *obj = (struct object *)mapping->file; |
| obj->ops->get_file_info( obj, &req ); |
| size_high = req.size_high; |
| size_low = ROUND_SIZE( 0, req.size_low ); |
| } |
| else if (!grow_file( mapping->file, size_high, size_low )) goto error; |
| } |
| else /* Anonymous mapping (no associated file) */ |
| { |
| if ((!size_high && !size_low) || (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_high, size_low )) goto error; |
| } |
| mapping->size_high = size_high; |
| mapping->size_low = ROUND_SIZE( 0, size_low ); |
| 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 shared_size=%08x ", |
| mapping->size_high, mapping->size_low, mapping->protect, mapping->file, |
| mapping->header_size, mapping->base, mapping->shared_file, mapping->shared_size ); |
| dump_object_name( &mapping->obj ); |
| fputc( '\n', stderr ); |
| } |
| |
| static int mapping_get_fd( struct object *obj ) |
| { |
| struct mapping *mapping = (struct mapping *)obj; |
| assert( obj->ops == &mapping_ops ); |
| return get_mmap_fd( mapping->file ); |
| } |
| |
| 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 ); |
| if (mapping->shared_next) mapping->shared_next->shared_prev = mapping->shared_prev; |
| if (mapping->shared_prev) mapping->shared_prev->shared_next = mapping->shared_next; |
| else shared_first = mapping->shared_next; |
| } |
| } |
| |
| 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; |
| |
| req->handle = 0; |
| if ((obj = create_mapping( req->size_high, req->size_low, |
| req->protect, req->file_handle, |
| get_req_data(req), get_req_data_size(req) ))) |
| { |
| int access = FILE_MAP_ALL_ACCESS; |
| if (!(req->protect & VPROT_WRITE)) access &= ~FILE_MAP_WRITE; |
| req->handle = alloc_handle( current->process, obj, access, req->inherit ); |
| release_object( obj ); |
| } |
| } |
| |
| /* open a handle to a mapping */ |
| DECL_HANDLER(open_mapping) |
| { |
| req->handle = open_object( get_req_data(req), get_req_data_size(req), |
| &mapping_ops, req->access, req->inherit ); |
| } |
| |
| /* get a mapping information */ |
| DECL_HANDLER(get_mapping_info) |
| { |
| struct mapping *mapping; |
| |
| if ((mapping = (struct mapping *)get_handle_obj( current->process, req->handle, |
| 0, &mapping_ops ))) |
| { |
| req->size_high = mapping->size_high; |
| req->size_low = mapping->size_low; |
| req->protect = mapping->protect; |
| req->header_size = mapping->header_size; |
| req->base = mapping->base; |
| req->shared_file = 0; |
| req->shared_size = mapping->shared_size; |
| if (mapping->shared_file) |
| req->shared_file = alloc_handle( current->process, mapping->shared_file, |
| GENERIC_READ|GENERIC_WRITE, 0 ); |
| release_object( mapping ); |
| } |
| } |
