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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>
#ifdef HAVE_SYS_MMAN_H
# include <sys/mman.h>
#endif
#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"
#include "security.h"
/* list of memory ranges, used to store committed info */
struct ranges
{
unsigned int count;
unsigned int max;
struct range
{
file_pos_t start;
file_pos_t end;
} ranges[1];
};
struct mapping
{
struct object obj; /* object header */
mem_size_t size; /* mapping size */
int protect; /* protection flags */
struct fd *fd; /* fd for mapped file */
int header_size; /* size of headers (for PE image mapping) */
client_ptr_t base; /* default base addr (for PE image mapping) */
struct ranges *committed; /* list of committed ranges in this 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 object_type *mapping_get_type( struct object *obj );
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 enum server_fd_type mapping_get_fd_type( struct fd *fd );
static const struct object_ops mapping_ops =
{
sizeof(struct mapping), /* size */
mapping_dump, /* dump */
mapping_get_type, /* get_type */
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 const struct fd_ops mapping_fd_ops =
{
default_fd_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
no_flush, /* flush */
mapping_get_fd_type, /* get_fd_type */
no_fd_ioctl, /* ioctl */
no_fd_queue_async, /* queue_async */
default_fd_reselect_async, /* reselect_async */
default_fd_cancel_async /* cancel_async */
};
static struct list shared_list = LIST_INIT(shared_list);
static size_t page_mask;
#define ROUND_SIZE(size) (((size) + page_mask) & ~page_mask)
/* extend a file beyond the current end of file */
static int grow_file( int unix_fd, file_pos_t new_size )
{
static const char zero;
off_t size = new_size;
if (sizeof(new_size) > sizeof(size) && size != new_size)
{
set_error( STATUS_INVALID_PARAMETER );
return 0;
}
/* extend the file one byte beyond the requested size and then truncate it */
/* this should work around ftruncate implementations that can't extend files */
if (pwrite( unix_fd, &zero, 1, size ) != -1)
{
ftruncate( unix_fd, size );
return 1;
}
file_set_error();
return 0;
}
/* check if the current directory allows exec mappings */
static int check_current_dir_for_exec(void)
{
int fd;
char tmpfn[] = "anonmap.XXXXXX";
void *ret = MAP_FAILED;
fd = mkstemps( tmpfn, 0 );
if (fd == -1) return 0;
if (grow_file( fd, 1 ))
{
ret = mmap( NULL, get_page_size(), PROT_READ | PROT_EXEC, MAP_PRIVATE, fd, 0 );
if (ret != MAP_FAILED) munmap( ret, get_page_size() );
}
close( fd );
unlink( tmpfn );
return (ret != MAP_FAILED);
}
/* create a temp file for anonymous mappings */
static int create_temp_file( file_pos_t size )
{
static int temp_dir_fd = -1;
char tmpfn[] = "anonmap.XXXXXX";
int fd;
if (temp_dir_fd == -1)
{
temp_dir_fd = server_dir_fd;
if (!check_current_dir_for_exec())
{
/* the server dir is noexec, try the config dir instead */
fchdir( config_dir_fd );
if (check_current_dir_for_exec())
temp_dir_fd = config_dir_fd;
else /* neither works, fall back to server dir */
fchdir( server_dir_fd );
}
}
else if (temp_dir_fd != server_dir_fd) fchdir( temp_dir_fd );
fd = mkstemps( tmpfn, 0 );
if (fd != -1)
{
if (!grow_file( fd, size ))
{
close( fd );
fd = -1;
}
unlink( tmpfn );
}
else file_set_error();
if (temp_dir_fd != server_dir_fd) fchdir( server_dir_fd );
return fd;
}
/* 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_fd( ptr->fd, mapping->fd ))
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;
}
/* add a range to the committed list */
static void add_committed_range( struct mapping *mapping, file_pos_t start, file_pos_t end )
{
unsigned int i, j;
struct range *ranges;
if (!mapping->committed) return; /* everything committed already */
for (i = 0, ranges = mapping->committed->ranges; i < mapping->committed->count; i++)
{
if (ranges[i].start > end) break;
if (ranges[i].end < start) continue;
if (ranges[i].start > start) ranges[i].start = start; /* extend downwards */
if (ranges[i].end < end) /* extend upwards and maybe merge with next */
{
for (j = i + 1; j < mapping->committed->count; j++)
{
if (ranges[j].start > end) break;
if (ranges[j].end > end) end = ranges[j].end;
}
if (j > i + 1)
{
memmove( &ranges[i + 1], &ranges[j], (mapping->committed->count - j) * sizeof(*ranges) );
mapping->committed->count -= j - (i + 1);
}
ranges[i].end = end;
}
return;
}
/* now add a new range */
if (mapping->committed->count == mapping->committed->max)
{
unsigned int new_size = mapping->committed->max * 2;
struct ranges *new_ptr = realloc( mapping->committed, offsetof( struct ranges, ranges[new_size] ));
if (!new_ptr) return;
new_ptr->max = new_size;
ranges = new_ptr->ranges;
mapping->committed = new_ptr;
}
memmove( &ranges[i + 1], &ranges[i], (mapping->committed->count - i) * sizeof(*ranges) );
ranges[i].start = start;
ranges[i].end = end;
mapping->committed->count++;
}
/* find the range containing start and return whether it's committed */
static int find_committed_range( struct mapping *mapping, file_pos_t start, mem_size_t *size )
{
unsigned int i;
struct range *ranges;
if (!mapping->committed) /* everything is committed */
{
*size = mapping->size - start;
return 1;
}
for (i = 0, ranges = mapping->committed->ranges; i < mapping->committed->count; i++)
{
if (ranges[i].start > start)
{
*size = ranges[i].start - start;
return 0;
}
if (ranges[i].end > start)
{
*size = ranges[i].end - start;
return 1;
}
}
*size = mapping->size - start;
return 0;
}
/* 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;
mem_size_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 ((shared_fd = create_temp_file( total_size )) == -1) return 0;
if (!(mapping->shared_file = create_file_for_fd( shared_fd, FILE_GENERIC_READ|FILE_GENERIC_WRITE, 0 )))
return 0;
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, int unix_fd, int protect )
{
IMAGE_DOS_HEADER dos;
IMAGE_SECTION_HEADER *sec = NULL;
struct
{
DWORD Signature;
IMAGE_FILE_HEADER FileHeader;
union
{
IMAGE_OPTIONAL_HEADER32 hdr32;
IMAGE_OPTIONAL_HEADER64 hdr64;
} opt;
} nt;
off_t pos;
int size;
/* load the headers */
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;
size = pread( unix_fd, &nt, sizeof(nt), pos );
if (size < sizeof(nt.Signature) + sizeof(nt.FileHeader)) goto error;
/* zero out Optional header in the case it's not present or partial */
if (size < sizeof(nt)) memset( (char *)&nt + size, 0, sizeof(nt) - size );
if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
switch (nt.opt.hdr32.Magic)
{
case IMAGE_NT_OPTIONAL_HDR32_MAGIC:
mapping->size = ROUND_SIZE( nt.opt.hdr32.SizeOfImage );
mapping->base = nt.opt.hdr32.ImageBase;
mapping->header_size = nt.opt.hdr32.SizeOfHeaders;
break;
case IMAGE_NT_OPTIONAL_HDR64_MAGIC:
mapping->size = ROUND_SIZE( nt.opt.hdr64.SizeOfImage );
mapping->base = nt.opt.hdr64.ImageBase;
mapping->header_size = nt.opt.hdr64.SizeOfHeaders;
break;
default:
goto error;
}
/* load the section headers */
pos += sizeof(nt.Signature) + sizeof(nt.FileHeader) + nt.FileHeader.SizeOfOptionalHeader;
size = sizeof(*sec) * nt.FileHeader.NumberOfSections;
if (pos + size > mapping->size) goto error;
if (pos + size > mapping->header_size) mapping->header_size = pos + size;
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->protect = protect;
free( sec );
return 1;
error:
free( sec );
set_error( STATUS_INVALID_FILE_FOR_SECTION );
return 0;
}
static struct object *create_mapping( struct directory *root, const struct unicode_str *name,
unsigned int attr, mem_size_t size, int protect,
obj_handle_t handle, const struct security_descriptor *sd )
{
struct mapping *mapping;
struct file *file;
struct fd *fd;
int access = 0;
int unix_fd;
struct stat st;
if (!page_mask) page_mask = sysconf( _SC_PAGESIZE ) - 1;
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 */
if (sd) default_set_sd( &mapping->obj, sd, OWNER_SECURITY_INFORMATION|
GROUP_SECURITY_INFORMATION|
DACL_SECURITY_INFORMATION|
SACL_SECURITY_INFORMATION );
mapping->header_size = 0;
mapping->base = 0;
mapping->fd = NULL;
mapping->shared_file = NULL;
mapping->committed = NULL;
if (protect & VPROT_READ) access |= FILE_READ_DATA;
if (protect & VPROT_WRITE) access |= FILE_WRITE_DATA;
if (handle)
{
const unsigned int sharing = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
unsigned int mapping_access = FILE_MAPPING_ACCESS;
if (!(protect & VPROT_COMMITTED))
{
set_error( STATUS_INVALID_PARAMETER );
goto error;
}
if (!(file = get_file_obj( current->process, handle, access ))) goto error;
fd = get_obj_fd( (struct object *)file );
/* file sharing rules for mappings are different so we use magic the access rights */
if (protect & VPROT_IMAGE) mapping_access |= FILE_MAPPING_IMAGE;
else if (protect & VPROT_WRITE) mapping_access |= FILE_MAPPING_WRITE;
if (!(mapping->fd = get_fd_object_for_mapping( fd, mapping_access, sharing )))
{
mapping->fd = dup_fd_object( fd, mapping_access, sharing, FILE_SYNCHRONOUS_IO_NONALERT );
if (mapping->fd) set_fd_user( mapping->fd, &mapping_fd_ops, NULL );
}
release_object( file );
release_object( fd );
if (!mapping->fd) goto error;
if ((unix_fd = get_unix_fd( mapping->fd )) == -1) goto error;
if (protect & VPROT_IMAGE)
{
if (!get_image_params( mapping, unix_fd, protect )) goto error;
return &mapping->obj;
}
if (fstat( unix_fd, &st ) == -1)
{
file_set_error();
goto error;
}
if (!size)
{
if (!(size = st.st_size))
{
set_error( STATUS_MAPPED_FILE_SIZE_ZERO );
goto error;
}
}
else if (st.st_size < size && !grow_file( unix_fd, size )) goto error;
}
else /* Anonymous mapping (no associated file) */
{
if (!size || (protect & VPROT_IMAGE))
{
set_error( STATUS_INVALID_PARAMETER );
goto error;
}
if (!(protect & VPROT_COMMITTED))
{
if (!(mapping->committed = mem_alloc( offsetof(struct ranges, ranges[8]) ))) goto error;
mapping->committed->count = 0;
mapping->committed->max = 8;
}
if ((unix_fd = create_temp_file( size )) == -1) goto error;
if (!(mapping->fd = create_anonymous_fd( &mapping_fd_ops, unix_fd, &mapping->obj,
FILE_SYNCHRONOUS_IO_NONALERT ))) goto error;
allow_fd_caching( mapping->fd );
}
mapping->size = (size + page_mask) & ~((mem_size_t)page_mask);
mapping->protect = protect;
return &mapping->obj;
error:
release_object( mapping );
return NULL;
}
struct mapping *get_mapping_obj( struct process *process, obj_handle_t handle, unsigned int access )
{
return (struct mapping *)get_handle_obj( process, handle, access, &mapping_ops );
}
/* open a new file handle to the file backing the mapping */
obj_handle_t open_mapping_file( struct process *process, struct mapping *mapping,
unsigned int access, unsigned int sharing )
{
obj_handle_t handle;
struct file *file = create_file_for_fd_obj( mapping->fd, access, sharing );
if (!file) return 0;
handle = alloc_handle( process, file, access, 0 );
release_object( file );
return handle;
}
struct mapping *grab_mapping_unless_removable( struct mapping *mapping )
{
if (is_fd_removable( mapping->fd )) return NULL;
return (struct mapping *)grab_object( mapping );
}
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 fd=%p header_size=%08x base=%08lx "
"shared_file=%p ",
(unsigned int)(mapping->size >> 32), (unsigned int)mapping->size,
mapping->protect, mapping->fd, mapping->header_size,
(unsigned long)mapping->base, mapping->shared_file );
dump_object_name( &mapping->obj );
fputc( '\n', stderr );
}
static struct object_type *mapping_get_type( struct object *obj )
{
static const WCHAR name[] = {'S','e','c','t','i','o','n'};
static const struct unicode_str str = { name, sizeof(name) };
return get_object_type( &str );
}
static struct fd *mapping_get_fd( struct object *obj )
{
struct mapping *mapping = (struct mapping *)obj;
return (struct fd *)grab_object( mapping->fd );
}
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->fd) release_object( mapping->fd );
if (mapping->shared_file)
{
release_object( mapping->shared_file );
list_remove( &mapping->shared_entry );
}
free( mapping->committed );
}
static enum server_fd_type mapping_get_fd_type( struct fd *fd )
{
return FD_TYPE_FILE;
}
int get_page_size(void)
{
if (!page_mask) page_mask = sysconf( _SC_PAGESIZE ) - 1;
return page_mask + 1;
}
/* create a file mapping */
DECL_HANDLER(create_mapping)
{
struct object *obj;
struct unicode_str name;
struct directory *root = NULL;
const struct object_attributes *objattr = get_req_data();
const struct security_descriptor *sd;
reply->handle = 0;
if (!objattr_is_valid( objattr, get_req_data_size() ))
return;
sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL;
objattr_get_name( objattr, &name );
if (objattr->rootdir && !(root = get_directory_obj( current->process, objattr->rootdir, 0 )))
return;
if ((obj = create_mapping( root, &name, req->attributes, req->size, req->protect, req->file_handle, sd )))
{
if (get_error() == STATUS_OBJECT_NAME_EXISTS)
reply->handle = alloc_handle( current->process, obj, req->access, req->attributes );
else
reply->handle = alloc_handle_no_access_check( 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 = get_mapping_obj( current->process, req->handle, req->access )))
{
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 );
}
}
/* get a range of committed pages in a file mapping */
DECL_HANDLER(get_mapping_committed_range)
{
struct mapping *mapping;
if ((mapping = get_mapping_obj( current->process, req->handle, 0 )))
{
if (!(req->offset & page_mask) && req->offset < mapping->size)
reply->committed = find_committed_range( mapping, req->offset, &reply->size );
else
set_error( STATUS_INVALID_PARAMETER );
release_object( mapping );
}
}
/* add a range to the committed pages in a file mapping */
DECL_HANDLER(add_mapping_committed_range)
{
struct mapping *mapping;
if ((mapping = get_mapping_obj( current->process, req->handle, 0 )))
{
if (!(req->size & page_mask) &&
!(req->offset & page_mask) &&
req->offset < mapping->size &&
req->size > 0 &&
req->size <= mapping->size - req->offset)
add_committed_range( mapping, req->offset, req->offset + req->size );
else
set_error( STATUS_INVALID_PARAMETER );
release_object( mapping );
}
}
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