[ros-diffs] [tkreuzer] 44766: [KDBG] Hackfix the problem with attaching to processes introduced in r44743, by lowering IRQL to passive level, although interrupts are off. Needed because KDBG calls pageable code.

[tkreuzer at svn.reactos.org]

Author: tkreuzer
Date: Sat Dec 26 20:36:24 2009
New Revision: 44766

URL: http://svn.reactos.org/svn/reactos?rev=44766&view=rev
Log:
[KDBG]
Hackfix the problem with attaching to processes introduced in r44743, by lowering IRQL to passive level, although interrupts are off. Needed because KDBG calls pageable code.

Modified:
    trunk/reactos/ntoskrnl/kdbg/kdb.c

Modified: trunk/reactos/ntoskrnl/kdbg/kdb.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/kdbg/kdb.c?rev=44766&r1=44765&r2=44766&view=diff
==============================================================================
--- trunk/reactos/ntoskrnl/kdbg/kdb.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/kdbg/kdb.c [iso-8859-1] Sat Dec 26 20:36:24 2009
@@ -1350,6 +1350,7 @@
     BOOLEAN Resume = FALSE;
     BOOLEAN EnterConditionMet = TRUE;
     ULONG OldEflags;
+    KIRQL OldIrql;
     NTSTATUS ExceptionCode;
 
     ExceptionCode = (ExceptionRecord ? ExceptionRecord->ExceptionCode : STATUS_BREAKPOINT);
@@ -1607,6 +1608,11 @@
     OldEflags = __readeflags();
     _disable();
 
+    /* HACK: Save the current IRQL and pretend we are at passive level,
+     * although interrupts are off. Needed because KDBG calls pageable code. */
+    OldIrql = KeGetCurrentIrql();
+    KeLowerIrql(PASSIVE_LEVEL);
+
     /* Exception inside the debugger? Game over. */
     if (InterlockedIncrement(&KdbEntryCount) > 1)
     {
@@ -1645,6 +1651,9 @@
 
     /* Decrement the entry count */
     InterlockedDecrement(&KdbEntryCount);
+
+    /* HACK: Raise back to old IRWL */
+    KeRaiseIrql(OldIrql, &OldIrql);
 
     /* Leave critical section */
     __writeeflags(OldEflags);