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ntdll: Always use MAP_SHARED in NtMapViewOfSection.

This commit is contained in:
Jacek Caban 2014-05-08 18:22:08 +02:00 committed by Alexandre Julliard
parent 0ec7907c61
commit 4792cf31c5
1 changed files with 10 additions and 13 deletions
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23
dlls/ntdll/virtual.c
View File

@ -854,11 +854,10 @@ done:
* The csVirtual section must be held by caller.
*/
static NTSTATUS map_file_into_view( struct file_view *view, int fd, size_t start, size_t size,
off_t offset, unsigned int vprot, BOOL removable )
off_t offset, unsigned int vprot, int flags, BOOL removable )
{
void *ptr;
int prot = VIRTUAL_GetUnixProt( vprot | VPROT_COMMITTED /* make sure it is accessible */ );
BOOL shared_write = (vprot & VPROT_WRITE) != 0;
assert( start < view->size );
assert( start + size <= view->size );
@ -871,11 +870,9 @@ static NTSTATUS map_file_into_view( struct file_view *view, int fd, size_t start
}
/* only try mmap if media is not removable (or if we require write access) */
if (!removable || shared_write)
if (!removable || (flags & MAP_SHARED))
{
int flags = MAP_FIXED | (shared_write ? MAP_SHARED : MAP_PRIVATE);
if (mmap( (char *)view->base + start, size, prot, flags, fd, offset ) != (void *)-1)
if (mmap( (char *)view->base + start, size, prot, flags | MAP_FIXED, fd, offset ) != (void *)-1)
goto done;
if ((errno == EPERM) && (prot & PROT_EXEC))
@ -885,7 +882,7 @@ static NTSTATUS map_file_into_view( struct file_view *view, int fd, size_t start
/* page-aligned (EINVAL), or because the underlying filesystem */
/* does not support mmap() (ENOEXEC,ENODEV), we do it by hand. */
if ((errno != ENOEXEC) && (errno != EINVAL) && (errno != ENODEV)) return FILE_GetNtStatus();
if (shared_write) /* we cannot fake shared write mappings */
if (flags & MAP_SHARED) /* we cannot fake shared mappings */
{
if (errno == EINVAL) return STATUS_INVALID_PARAMETER;
ERR( "shared writable mmap not supported, broken filesystem?\n" );
@ -1097,7 +1094,7 @@ static NTSTATUS map_image( HANDLE hmapping, int fd, char *base, SIZE_T total_siz
if (!st.st_size) goto error;
header_size = min( header_size, st.st_size );
if (map_file_into_view( view, fd, 0, header_size, 0, VPROT_COMMITTED | VPROT_READ | VPROT_WRITECOPY,
!dup_mapping ) != STATUS_SUCCESS) goto error;
MAP_PRIVATE, !dup_mapping ) != STATUS_SUCCESS) goto error;
dos = (IMAGE_DOS_HEADER *)ptr;
nt = (IMAGE_NT_HEADERS *)(ptr + dos->e_lfanew);
header_end = ptr + ROUND_SIZE( 0, header_size );
@ -1122,7 +1119,7 @@ static NTSTATUS map_image( HANDLE hmapping, int fd, char *base, SIZE_T total_siz
/* in that case Windows simply maps in the whole file */
if (map_file_into_view( view, fd, 0, total_size, 0, VPROT_COMMITTED | VPROT_READ,
!dup_mapping ) != STATUS_SUCCESS) goto error;
MAP_PRIVATE, !dup_mapping ) != STATUS_SUCCESS) goto error;
/* check that all sections are loaded at the right offset */
if (nt->OptionalHeader.FileAlignment != nt->OptionalHeader.SectionAlignment) goto error;
@ -1176,7 +1173,7 @@ static NTSTATUS map_image( HANDLE hmapping, int fd, char *base, SIZE_T total_siz
sec->Characteristics );
if (map_file_into_view( view, shared_fd, sec->VirtualAddress, map_size, pos,
VPROT_COMMITTED | VPROT_READ | VPROT_WRITE,
FALSE ) != STATUS_SUCCESS)
MAP_SHARED, FALSE ) != STATUS_SUCCESS)
{
ERR_(module)( "Could not map shared section %.8s\n", sec->Name );
goto error;
@ -1193,7 +1190,7 @@ static NTSTATUS map_image( HANDLE hmapping, int fd, char *base, SIZE_T total_siz
map_file_into_view( view, shared_fd, base, end - base,
pos + (base - sec->VirtualAddress),
VPROT_COMMITTED | VPROT_READ | VPROT_WRITECOPY,
FALSE );
MAP_PRIVATE, FALSE );
}
pos += map_size;
continue;
@ -1215,7 +1212,7 @@ static NTSTATUS map_image( HANDLE hmapping, int fd, char *base, SIZE_T total_siz
end < file_start ||
map_file_into_view( view, fd, sec->VirtualAddress, file_size, file_start,
VPROT_COMMITTED | VPROT_READ | VPROT_WRITECOPY,
!dup_mapping ) != STATUS_SUCCESS)
MAP_PRIVATE, !dup_mapping ) != STATUS_SUCCESS)
{
ERR_(module)( "Could not map section %.8s, file probably truncated\n", sec->Name );
goto error;
@ -2630,7 +2627,7 @@ NTSTATUS WINAPI NtMapViewOfSection( HANDLE handle, HANDLE process, PVOID *addr_p
TRACE("handle=%p size=%lx offset=%x%08x\n",
handle, size, offset.u.HighPart, offset.u.LowPart );
res = map_file_into_view( view, unix_handle, 0, size, offset.QuadPart, vprot, !dup_mapping );
res = map_file_into_view( view, unix_handle, 0, size, offset.QuadPart, vprot, MAP_SHARED, !dup_mapping );
if (res == STATUS_SUCCESS)
{
*addr_ptr = view->base;