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[NTOS:KE:X64][NTDLL:X64] Implement KiUserExceptionDispatcher and fix KiDispatchExceptionToUser
This commit is contained in:
Timo Kreuzer
parent
1bfacf06f7
commit
2a8c680dbe
3 changed files with 151 additions and 24 deletions
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@ -107,11 +107,125 @@ StatusRaise:
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.ENDP
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/*
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BOOLEAN
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NTAPI
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RtlDispatchException(
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_In_ PEXCEPTION_RECORD ExceptionRecord,
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_In_ PCONTEXT ContextRecord);
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*/
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EXTERN RtlDispatchException:PROC
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/*
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NTSTATUS
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NTAPI
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ZwContinue(
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_In_ PCONTEXT Context,
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_In_ BOOLEAN TestAlert);
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*/
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EXTERN ZwContinue:PROC
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/*
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NTSTATUS
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NTAPI
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ZwRaiseException(
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_In_ PEXCEPTION_RECORD ExceptionRecord,
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_In_ PCONTEXT Context,
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_In_ BOOLEAN SearchFrames);
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*/
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EXTERN ZwRaiseException:PROC
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/*
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VOID
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NTAPI
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RtlRaiseStatus(
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_In_ PEXCEPTION_RECORD ExceptionRecord);
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*/
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EXTERN RtlRaiseException:PROC
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/*
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VOID
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KiUserExceptionDispatcher(
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CONTEXT ContextRecord<rcx>,
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PEXCEPTION_RECORD ExceptionRecord<rdx>);
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This function is called with the following stack layout:
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CONTEXT ContextRecord <- RSP, RCX
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EXCEPTION_RECORD ExceptionRecord <- RDX
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ULONG64 Alignment
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MACHINE_FRAME MachineFrame
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*/
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PUBLIC KiUserExceptionDispatcher
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.PROC KiUserExceptionDispatcher
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.endprolog
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int 3
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; The stack is set up with a KUSER_EXCEPTION_STACK
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; The frame ends with a MACHINE_FRAME.
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.PUSHFRAME
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; This is for the alignment, EXCEPTION_RECORD and CONTEXT
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.ALLOCSTACK 8 + EXCEPTION_RECORD_LENGTH + CONTEXT_FRAME_LENGTH
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.ENDPROLOG
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/* Clear direction flag */
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cld
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/* Dispatch the exception */
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call RtlDispatchException
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/* Check for success */
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or al, al
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jz RaiseException
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/* We're fine, continue execution */
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lea rcx, [rsp] ; ContextRecord
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mov dl, 0 ; TestAlert
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call ZwContinue
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/* Exit */
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jmp Exit
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RaiseException:
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/* Raise the exception */
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lea rcx, [rsp + CONTEXT_FRAME_LENGTH] ; ExceptionRecord
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lea rdx, [rsp] ; ContextRecord
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xor r8, r8
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call ZwRaiseException
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Exit:
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lea rcx, [rsp + CONTEXT_FRAME_LENGTH] ; ExceptionRecord
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mov rdx, rax
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call KiUserExceptionDispatcherNested
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ret
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.ENDP
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/*
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VOID
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KiUserExceptionDispatcherNested(
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_In_ ExceptionRecord<rcx>,
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_In_ Status<edx>
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)
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*/
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.PROC KiUserExceptionDispatcherNested
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/* Allocate space for the nested exception record */
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sub rsp, EXCEPTION_RECORD_LENGTH
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.ALLOCSTACK EXCEPTION_RECORD_LENGTH
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.ENDPROLOG
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/* Set it up */
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mov dword ptr [rsp + ErNumberParameters], 0
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mov dword ptr [rsp + ErExceptionFlags], EXCEPTION_NONCONTINUABLE
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mov [rsp + ErExceptionRecord], rcx
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mov [rsp + ErExceptionCode], edx
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/* Raise the exception */
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mov rcx, rsp
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call RtlRaiseException
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/* Cleanup stack and return */
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add rsp, EXCEPTION_RECORD_LENGTH
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ret
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.ENDP
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END
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@ -100,10 +100,8 @@ KiDispatchExceptionToUser(
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IN PEXCEPTION_RECORD ExceptionRecord)
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{
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EXCEPTION_RECORD LocalExceptRecord;
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ULONG Size;
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ULONG64 UserRsp;
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PCONTEXT UserContext;
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PEXCEPTION_RECORD UserExceptionRecord;
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PKUSER_EXCEPTION_STACK UserStack;
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/* Make sure we have a valid SS */
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if (TrapFrame->SegSs != (KGDT64_R3_DATA | RPL_MASK))
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@ -115,27 +113,29 @@ KiDispatchExceptionToUser(
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ExceptionRecord = &LocalExceptRecord;
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}
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/* Calculate the size of the exception record */
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Size = FIELD_OFFSET(EXCEPTION_RECORD, ExceptionInformation) +
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ExceptionRecord->NumberParameters * sizeof(ULONG64);
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/* Get new stack pointer and align it to 16 bytes */
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UserRsp = (Context->Rsp - Size - sizeof(CONTEXT)) & ~15;
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UserRsp = (Context->Rsp - sizeof(KUSER_EXCEPTION_STACK)) & ~15;
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/* Get pointers to the usermode context and exception record */
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UserContext = (PVOID)UserRsp;
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UserExceptionRecord = (PVOID)(UserRsp + sizeof(CONTEXT));
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/* Get pointer to the usermode context, exception record and machine frame */
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UserStack = (PKUSER_EXCEPTION_STACK)UserRsp;
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/* Set up the user-stack */
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_SEH2_TRY
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{
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/* Probe stack and copy Context */
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ProbeForWrite(UserContext, sizeof(CONTEXT), sizeof(ULONG64));
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*UserContext = *Context;
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/* Probe the user stack frame and zero it out */
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ProbeForWrite(UserStack, sizeof(*UserStack), TYPE_ALIGNMENT(KUSER_EXCEPTION_STACK));
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RtlZeroMemory(UserStack, sizeof(*UserStack));
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/* Probe stack and copy exception record */
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ProbeForWrite(UserExceptionRecord, Size, sizeof(ULONG64));
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*UserExceptionRecord = *ExceptionRecord;
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/* Copy Context and ExceptionFrame */
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UserStack->Context = *Context;
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UserStack->ExceptionRecord = *ExceptionRecord;
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/* Setup the machine frame */
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UserStack->MachineFrame.Rip = Context->Rip;
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UserStack->MachineFrame.SegCs = Context->SegCs;
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UserStack->MachineFrame.EFlags = Context->EFlags;
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UserStack->MachineFrame.Rsp = Context->Rsp;
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UserStack->MachineFrame.SegSs = Context->SegSs;
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}
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_SEH2_EXCEPT((LocalExceptRecord = *_SEH2_GetExceptionInformation()->ExceptionRecord),
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EXCEPTION_EXECUTE_HANDLER)
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@ -148,8 +148,8 @@ KiDispatchExceptionToUser(
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_SEH2_END;
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/* Now set the two params for the user-mode dispatcher */
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TrapFrame->Rcx = (ULONG64)UserContext;
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TrapFrame->Rdx = (ULONG64)UserExceptionRecord;
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TrapFrame->Rcx = (ULONG64)&UserStack->ExceptionRecord;
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TrapFrame->Rdx = (ULONG64)&UserStack->Context;
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/* Set new Stack Pointer */
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TrapFrame->Rsp = UserRsp;
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@ -347,8 +347,9 @@ KiDispatchException(IN PEXCEPTION_RECORD ExceptionRecord,
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/* Forward exception to user mode debugger */
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if (DbgkForwardException(ExceptionRecord, TRUE, FALSE)) return;
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//KiDispatchExceptionToUser()
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__debugbreak();
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/* Forward exception to user mode (does not return) */
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KiDispatchExceptionToUser(TrapFrame, &Context, ExceptionRecord);
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NT_ASSERT(FALSE);
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}
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/* Try second chance */
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@ -998,6 +998,18 @@ typedef struct _UCALLOUT_FRAME
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MACHINE_FRAME MachineFrame;
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} UCALLOUT_FRAME, *PUCALLOUT_FRAME; // size = 0x0058
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//
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// Stack frame layout for KiUserExceptionDispatcher
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// The name is totally made up
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//
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typedef struct _KUSER_EXCEPTION_STACK
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{
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CONTEXT Context;
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EXCEPTION_RECORD ExceptionRecord;
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ULONG64 Alignment;
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MACHINE_FRAME MachineFrame;
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} KUSER_EXCEPTION_STACK, * PKUSER_EXCEPTION_STACK;
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typedef struct _DISPATCHER_CONTEXT
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{
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ULONG64 ControlPc;
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