[fireball] 34351: - Initialize TLS expansion bitmap properly (fixes accessing uninitialized memory when all regular TEB slots for TLS data are occupied).

Author: fireball
Date: Mon Jul  7 04:24:10 2008
New Revision: 34351

URL: http://svn.reactos.org/svn/reactos?rev=34351&view=rev
Log:
- Initialize TLS expansion bitmap properly (fixes accessing uninitialized memory when all
regular TEB slots for TLS data are occupied).

Modified:
    trunk/reactos/dll/ntdll/ldr/startup.c

Modified: trunk/reactos/dll/ntdll/ldr/startup.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/dll/ntdll/ldr/startup.c?re…
==============================================================================
--- trunk/reactos/dll/ntdll/ldr/startup.c [iso-8859-1] (original)
+++ trunk/reactos/dll/ntdll/ldr/startup.c [iso-8859-1] Mon Jul  7 04:24:10 2008
@@ -27,6 +27,7 @@
 static RTL_CRITICAL_SECTION PebLock;
 static RTL_CRITICAL_SECTION LoaderLock;
 static RTL_BITMAP TlsBitMap;
+static RTL_BITMAP TlsExpansionBitMap;
 PLDR_DATA_TABLE_ENTRY ExeModule;
 
 NTSTATUS LdrpAttachThread (VOID);
@@ -333,11 +334,16 @@
        Peb->FastPebLockRoutine = (PPEBLOCKROUTINE)RtlEnterCriticalSection;
        Peb->FastPebUnlockRoutine = (PPEBLOCKROUTINE)RtlLeaveCriticalSection;
 
-       /* initialize tls bitmap */
+       /* initialize tls bitmaps */
        RtlInitializeBitMap (&TlsBitMap,
                             Peb->TlsBitmapBits,
                             TLS_MINIMUM_AVAILABLE);
+       RtlInitializeBitMap (&TlsExpansionBitMap,
+                            Peb->TlsExpansionBitmapBits,
+                            TLS_EXPANSION_SLOTS);
+
        Peb->TlsBitmap = &TlsBitMap;
+       Peb->TlsExpansionBitmap = &TlsExpansionBitMap;
        Peb->TlsExpansionCounter = TLS_MINIMUM_AVAILABLE;
 
        /* Initialize table of callbacks for the kernel. */