Sweden-Number/server/mapping.c

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/*
* 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>
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#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
{
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struct object obj; /* object header */
file_pos_t size; /* mapping size */
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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);
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#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)
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/* 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 )
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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 */
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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:
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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 );
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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)
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{
set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
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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 );
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if (mapping->shared_file)
{
release_object( mapping->shared_file );
list_remove( &mapping->shared_entry );
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}
}
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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 );
}
}