348 lines
11 KiB
C
348 lines
11 KiB
C
/*
|
|
* 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 */
|
|
};
|
|
|
|
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 */
|
|
};
|
|
|
|
#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 );
|
|
}
|
|
|
|
/* 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 */
|
|
|
|
/* 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;
|
|
|
|
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,
|
|
int 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 != -1)
|
|
{
|
|
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 );
|
|
}
|
|
|
|
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 = -1;
|
|
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 = -1;
|
|
req->shared_size = mapping->shared_size;
|
|
req->anonymous = !mapping->file;
|
|
if (mapping->shared_file)
|
|
req->shared_file = alloc_handle( current->process, mapping->shared_file,
|
|
GENERIC_READ|GENERIC_WRITE, 0 );
|
|
release_object( mapping );
|
|
}
|
|
}
|