[ion] 23802: - Some fixes to KiDispatchException: Add support for forwarding exception back to user-mode, protect against V86 or invalid-stack faults, handle stack overflow exception while handling usermode exception (Thanks KJK for the SEH_FILTER help). Decrement EIP by one when hitting an INT3, to get the correct address. - Remove two associated kernel fun entries.
30 Aug
2006
30 Aug
'06
4:58 p.m.
Author: ion
Date: Wed Aug 30 20:58:12 2006
New Revision: 23802
URL: http://svn.reactos.org/svn/reactos?rev=23802&view=rev
Log:
- Some fixes to KiDispatchException: Add support for forwarding exception back to
user-mode, protect against V86 or invalid-stack faults, handle stack overflow exception
while handling usermode exception (Thanks KJK for the SEH_FILTER help). Decrement EIP by
one when hitting an INT3, to get the correct address.
- Remove two associated kernel fun entries.
Modified:
trunk/reactos/ntoskrnl/KrnlFun.c
trunk/reactos/ntoskrnl/dbgk/debug.c
trunk/reactos/ntoskrnl/include/internal/dbgk.h
trunk/reactos/ntoskrnl/include/internal/ke.h
trunk/reactos/ntoskrnl/ke/i386/exp.c
Modified: trunk/reactos/ntoskrnl/KrnlFun.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/KrnlFun.c?rev=238…
==============================================================================
--- trunk/reactos/ntoskrnl/KrnlFun.c (original)
+++ trunk/reactos/ntoskrnl/KrnlFun.c Wed Aug 30 20:58:12 2006
@@ -25,9 +25,7 @@
// - Use Object Type Mutex/Lock.
//
// Ke:
-// - Add PSEH handler when an exception occurs in an exception (KiCopyExceptionRecord).
// - Get rid of KiRosPrintAddress and use KiDumpParameterImages instead.
-// - Forward exceptions to user-mode debugger.
// - Sanitize some context fields during conversions.
// - Implement stack fault and segment fault handlers.
// - Implement kernel-mode GPF handler, possibly fixing below:
Modified: trunk/reactos/ntoskrnl/dbgk/debug.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/dbgk/debug.c?rev=…
==============================================================================
--- trunk/reactos/ntoskrnl/dbgk/debug.c (original)
+++ trunk/reactos/ntoskrnl/dbgk/debug.c Wed Aug 30 20:58:12 2006
@@ -24,6 +24,17 @@
{
/* FIXME: Implement */
}
+
+BOOLEAN
+NTAPI
+DbgkForwardException(IN PEXCEPTION_RECORD ExceptionRecord,
+ IN BOOLEAN DebugPort,
+ IN BOOLEAN SecondChance)
+{
+ /* FIXME: Implement */
+ return FALSE;
+}
+
NTSTATUS
NTAPI
Modified: trunk/reactos/ntoskrnl/include/internal/dbgk.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/include/internal/…
==============================================================================
--- trunk/reactos/ntoskrnl/include/internal/dbgk.h (original)
+++ trunk/reactos/ntoskrnl/include/internal/dbgk.h Wed Aug 30 20:58:12 2006
@@ -20,6 +20,14 @@
IN PEPROCESS Parent
);
+BOOLEAN
+NTAPI
+DbgkForwardException(
+ IN PEXCEPTION_RECORD ExceptionRecord,
+ IN BOOLEAN DebugPort,
+ IN BOOLEAN SecondChance
+);
+
extern POBJECT_TYPE DbgkDebugObjectType;
#endif
Modified: trunk/reactos/ntoskrnl/include/internal/ke.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/include/internal/…
==============================================================================
--- trunk/reactos/ntoskrnl/include/internal/ke.h (original)
+++ trunk/reactos/ntoskrnl/include/internal/ke.h Wed Aug 30 20:58:12 2006
@@ -691,13 +691,6 @@
ULONG FrameCount
);
-ULONG
-STDCALL
-KeRosGetStackFrames(
- PULONG Frames,
- ULONG FrameCount
-);
-
VOID
NTAPI
KiSetSystemTime(PLARGE_INTEGER NewSystemTime);
Modified: trunk/reactos/ntoskrnl/ke/i386/exp.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ke/i386/exp.c?rev…
==============================================================================
--- trunk/reactos/ntoskrnl/ke/i386/exp.c (original)
+++ trunk/reactos/ntoskrnl/ke/i386/exp.c Wed Aug 30 20:58:12 2006
@@ -15,6 +15,22 @@
#include <debug.h>
/* FUNCTIONS *****************************************************************/
+
+_SEH_DEFINE_LOCALS(KiCopyInfo)
+{
+ volatile EXCEPTION_RECORD SehExceptRecord;
+};
+
+_SEH_FILTER(KiCopyInformation)
+{
+ _SEH_ACCESS_LOCALS(KiCopyInfo);
+
+ /* Copy the exception records and return to the handler */
+ RtlMoveMemory((PVOID)&_SEH_VAR(SehExceptRecord),
+ _SEH_GetExceptionPointers()->ExceptionRecord,
+ sizeof(EXCEPTION_RECORD));
+ return EXCEPTION_EXECUTE_HANDLER;
+}
VOID
INIT_FUNCTION
@@ -588,7 +604,8 @@
KD_CONTINUE_TYPE Action;
ULONG_PTR Stack, NewStack;
ULONG Size;
- BOOLEAN UserDispatch = FALSE;
+ EXCEPTION_RECORD LocalExceptRecord;
+ _SEH_DECLARE_LOCALS(KiCopyInfo);
/* Increase number of Exception Dispatches */
KeGetCurrentPrcb()->KeExceptionDispatchCount++;
@@ -596,16 +613,32 @@
/* Set the context flags */
Context.ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
- /* Check if User Mode */
- if (PreviousMode == UserMode)
+ /* Check if User Mode or if the debugger isenabled */
+ if ((PreviousMode == UserMode) || (KdDebuggerEnabled))
{
/* Add the FPU Flag */
Context.ContextFlags |= CONTEXT_FLOATING_POINT;
- if (KeI386FxsrPresent) Context.ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
+
+ /* Check for NPX Support */
+ if (KeI386FxsrPresent)
+ {
+ /* Save those too */
+ Context.ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
+ }
}
/* Get a Context */
KeTrapFrameToContext(TrapFrame, ExceptionFrame, &Context);
+
+ /* Fix up EIP */
+ if (ExceptionRecord->ExceptionCode == STATUS_BREAKPOINT)
+ {
+ /* Decrement EIP by one */
+ Context.Eip--;
+ }
+
+ ASSERT(!((PreviousMode == KernelMode) &&
+ (Context.EFlags & EFLAGS_V86_MASK)));
/* Handle kernel-mode first, it's simpler */
if (PreviousMode == KernelMode)
@@ -625,11 +658,7 @@
if (Action == kdContinue) goto Handled;
/* If the Debugger couldn't handle it, dispatch the exception */
- if (RtlDispatchException(ExceptionRecord, &Context))
- {
- /* It was handled by an exception handler, continue */
- goto Handled;
- }
+ if (RtlDispatchException(ExceptionRecord, &Context)) goto Handled;
}
/* This is a second-chance exception, only for the debugger */
@@ -644,12 +673,11 @@
if (Action == kdContinue) goto Handled;
/* Third strike; you're out */
- KEBUGCHECKWITHTF(KMODE_EXCEPTION_NOT_HANDLED,
- ExceptionRecord->ExceptionCode,
- (ULONG_PTR)ExceptionRecord->ExceptionAddress,
- ExceptionRecord->ExceptionInformation[0],
- ExceptionRecord->ExceptionInformation[1],
- TrapFrame);
+ KeBugCheckEx(KMODE_EXCEPTION_NOT_HANDLED,
+ ExceptionRecord->ExceptionCode,
+ (ULONG_PTR)ExceptionRecord->ExceptionAddress,
+ ExceptionRecord->ExceptionInformation[0],
+ ExceptionRecord->ExceptionInformation[1]);
}
else
{
@@ -668,27 +696,39 @@
if (Action == kdContinue) goto Handled;
/* FIXME: Forward exception to user mode debugger */
+ if (DbgkForwardException(ExceptionRecord, TRUE, FALSE)) goto Exit;
/* Set up the user-stack */
+DispatchToUser:
_SEH_TRY
{
+ /* Make sure we have a valid SS and that this isn't V86 mode */
+ if ((TrapFrame->HardwareSegSs != (KGDT_R3_DATA | RPL_MASK)) ||
+ (TrapFrame->EFlags & EFLAGS_V86_MASK))
+ {
+ /* Raise an exception instead */
+ LocalExceptRecord.ExceptionCode = STATUS_ACCESS_VIOLATION;
+ LocalExceptRecord.ExceptionFlags = 0;
+ LocalExceptRecord.NumberParameters = 0;
+ RtlRaiseException(&LocalExceptRecord);
+ }
+
/* Align context size and get stack pointer */
Size = (sizeof(CONTEXT) + 3) & ~3;
Stack = (Context.Esp & ~3) - Size;
- DPRINT("Stack: %lx\n", Stack);
/* Probe stack and copy Context */
ProbeForWrite((PVOID)Stack, Size, sizeof(ULONG));
RtlCopyMemory((PVOID)Stack, &Context, sizeof(CONTEXT));
/* Align exception record size and get stack pointer */
- Size = (sizeof(EXCEPTION_RECORD) -
- (EXCEPTION_MAXIMUM_PARAMETERS -
ExceptionRecord->NumberParameters) *
- sizeof(ULONG) + 3) & ~3;
+ Size = (sizeof(EXCEPTION_RECORD) -
+ (EXCEPTION_MAXIMUM_PARAMETERS -
+ ExceptionRecord->NumberParameters) *
+ sizeof(ULONG) + 3) & ~3;
NewStack = Stack - Size;
- DPRINT("NewStack: %lx\n", NewStack);
-
- /* Probe stack and copy exception record. Don't forget to add the two
params */
+
+ /* Probe stack and copy exception record */
ProbeForWrite((PVOID)(NewStack - 2 * sizeof(ULONG_PTR)),
Size + 2 * sizeof(ULONG_PTR),
sizeof(ULONG));
@@ -699,34 +739,59 @@
*(PULONG_PTR)(NewStack - 2 * sizeof(ULONG_PTR)) = NewStack;
/* Set new Stack Pointer */
+ KiSsToTrapFrame(TrapFrame, KGDT_R3_DATA);
KiEspToTrapFrame(TrapFrame, NewStack - 2 * sizeof(ULONG_PTR));
+
+ /* Force correct segments */
+ TrapFrame->SegCs = KGDT_R3_CODE | RPL_MASK;
+ TrapFrame->SegDs = KGDT_R3_DATA | RPL_MASK;
+ TrapFrame->SegEs = KGDT_R3_DATA | RPL_MASK;
+ TrapFrame->SegFs = KGDT_R3_TEB | RPL_MASK;
+ TrapFrame->SegGs = 0;
/* Set EIP to the User-mode Dispathcer */
TrapFrame->Eip = (ULONG)KeUserExceptionDispatcher;
- UserDispatch = TRUE;
_SEH_LEAVE;
}
- _SEH_HANDLE
- {
- /* Do second-chance */
+ _SEH_EXCEPT(KiCopyInformation)
+ {
+ /* Check if we got a stack overflow and raise that instead */
+ if (_SEH_VAR(SehExceptRecord).ExceptionCode ==
+ STATUS_STACK_OVERFLOW)
+ {
+ /* Copy the exception address and record */
+ _SEH_VAR(SehExceptRecord).ExceptionAddress =
+ ExceptionRecord->ExceptionAddress;
+ RtlMoveMemory(ExceptionRecord,
+ (PVOID)&_SEH_VAR(SehExceptRecord),
+ sizeof(EXCEPTION_RECORD));
+
+ /* Do the exception again */
+ goto DispatchToUser;
+ }
}
_SEH_END;
}
- /* If we dispatch to user, return now */
- if (UserDispatch) return;
-
- /* FIXME: Forward the exception to the debugger for 2nd chance */
-
- /* 3rd strike, kill the thread */
- DPRINT1("Unhandled UserMode exception, terminating thread\n");
- ZwTerminateThread(NtCurrentThread(), ExceptionRecord->ExceptionCode);
- KEBUGCHECKWITHTF(KMODE_EXCEPTION_NOT_HANDLED,
- ExceptionRecord->ExceptionCode,
- (ULONG_PTR)ExceptionRecord->ExceptionAddress,
- ExceptionRecord->ExceptionInformation[0],
- ExceptionRecord->ExceptionInformation[1],
- TrapFrame);
+ /* Try second chance */
+ if (DbgkForwardException(ExceptionRecord, TRUE, FALSE))
+ {
+ /* Handled, get out */
+ goto Exit;
+ }
+ else if (DbgkForwardException(ExceptionRecord, FALSE, TRUE))
+ {
+ /* Handled, get out */
+ goto Exit;
+ }
+
+ /* 3rd strike, kill the process */
+ ZwTerminateProcess(NtCurrentProcess(), ExceptionRecord->ExceptionCode);
+ KeBugCheckEx(KMODE_EXCEPTION_NOT_HANDLED,
+ ExceptionRecord->ExceptionCode,
+ (ULONG_PTR)ExceptionRecord->ExceptionAddress,
+ ExceptionRecord->ExceptionInformation[0],
+ ExceptionRecord->ExceptionInformation[1]);
}
Handled:
@@ -736,6 +801,7 @@
TrapFrame,
Context.ContextFlags,
PreviousMode);
+Exit:
return;
}
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