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Check for overlapping memory views and delete the offending view if 

necessary, to ensure we never have two views covering the same
address.
This commit is contained in:
Alexandre Julliard 2004-01-16 04:52:17 +00:00
parent 517248d7bc
commit 94d5531e6f
1 changed files with 42 additions and 21 deletions
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63
dlls/ntdll/virtual.c
View File

@ -237,6 +237,27 @@ static FILE_VIEW *VIRTUAL_FindView( const void *addr ) /* [in] Address */
} }
/***********************************************************************
* VIRTUAL_DeleteView
* Deletes a view.
*
* RETURNS
* None
*/
static void VIRTUAL_DeleteView( FILE_VIEW *view ) /* [in] View */
{
RtlEnterCriticalSection(&csVirtual);
if (!(view->flags & VFLAG_SYSTEM))
munmap( (void *)view->base, view->size );
if (view->next) view->next->prev = view->prev;
if (view->prev) view->prev->next = view->next;
else VIRTUAL_FirstView = view->next;
RtlLeaveCriticalSection(&csVirtual);
if (view->mapping) NtClose( view->mapping );
free( view );
}
/*********************************************************************** /***********************************************************************
* VIRTUAL_CreateView * VIRTUAL_CreateView
* *
@ -290,6 +311,27 @@ static FILE_VIEW *VIRTUAL_CreateView( void *base, UINT size, UINT flags,
view->prev = prev; view->prev = prev;
if (view->next) view->next->prev = view; if (view->next) view->next->prev = view;
prev->next = view; prev->next = view;
/* Check for overlapping views. This can happen if the previous view
* was a system view that got unmapped behind our back. In that case
* we recover by simply deleting it. */
if ((char *)prev->base + prev->size > (char *)base)
{
TRACE( "overlapping prev view %p-%p for %p-%p\n",
prev->base, (char *)prev->base + prev->size,
base, (char *)base + view->size );
assert( view->prev->flags & VFLAG_SYSTEM );
VIRTUAL_DeleteView( view->prev );
}
}
/* check for overlap with next too */
if (view->next && (char *)base + view->size > (char *)view->next->base)
{
TRACE( "overlapping next view %p-%p for %p-%p\n",
view->next->base, (char *)view->next->base + view->next->size,
base, (char *)base + view->size );
assert( view->next->flags & VFLAG_SYSTEM );
VIRTUAL_DeleteView( view->next );
} }
RtlLeaveCriticalSection(&csVirtual); RtlLeaveCriticalSection(&csVirtual);
VIRTUAL_DEBUG_DUMP_VIEW( view ); VIRTUAL_DEBUG_DUMP_VIEW( view );
@ -297,27 +339,6 @@ static FILE_VIEW *VIRTUAL_CreateView( void *base, UINT size, UINT flags,
} }
/***********************************************************************
* VIRTUAL_DeleteView
* Deletes a view.
*
* RETURNS
* None
*/
static void VIRTUAL_DeleteView( FILE_VIEW *view ) /* [in] View */
{
if (!(view->flags & VFLAG_SYSTEM))
munmap( (void *)view->base, view->size );
RtlEnterCriticalSection(&csVirtual);
if (view->next) view->next->prev = view->prev;
if (view->prev) view->prev->next = view->next;
else VIRTUAL_FirstView = view->next;
RtlLeaveCriticalSection(&csVirtual);
if (view->mapping) NtClose( view->mapping );
free( view );
}
/*********************************************************************** /***********************************************************************
* VIRTUAL_GetUnixProt * VIRTUAL_GetUnixProt
* *