456 lines
13 KiB
C++
456 lines
13 KiB
C++
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/*++
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Copyright (c) 2000-2002 Microsoft Corporation
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Module Name:
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IgnoreException.cpp
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Abstract:
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This shim is for handling exceptions that get thrown by bad apps.
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The primary causes of unhandled exceptions are:
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1. Priviliged mode instructions: cli, sti, out etc
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2. Access violations
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In most cases, ignoring an Access Violation will be fatal for the app,
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but it works in some cases, eg:
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Deer Hunter 2 - their 3d algorithm reads too far back in a lookup
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buffer. This is a game bug and doesn't crash win9x because that memory
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is usually allocated.
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Interstate 76 also requires a Divide by Zero exception to be ignored.
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Notes:
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This is a general purpose shim.
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History:
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02/10/2000 linstev Created
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10/17/2000 maonis Bug fix - now it ignores AVs correctly.
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02/27/2001 robkenny Converted to use CString
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02/15/2002 robkenny Shim was copying data into a temp buffer without verifying
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that the buffer was large enough.
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Cleaned up some signed/unsigned comparison mismatch.
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(IgnoreException)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_END
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// Exception code for OutputDebugString
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#define DBG_EXCEPTION 0x40010000L
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// Determine how to manage second chance exceptions
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BOOL g_bWin2000 = FALSE;
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DWORD g_dwLastEip = 0;
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extern DWORD GetInstructionLengthFromAddress(LPBYTE pEip);
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typedef enum
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{
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eActive = 0,
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eFirstChance,
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eSecondChance,
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eExitProcess
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} EMODE;
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WCHAR * ToWchar(EMODE emode)
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{
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switch (emode)
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{
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case eActive:
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return L"Active";
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case eFirstChance:
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return L"FirstChance";
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case eSecondChance:
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return L"SecondChance";
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case eExitProcess:
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return L"ExitProcess";
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};
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return L"ERROR";
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}
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// Convert a text version of EMODE to a EMODE value
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EMODE ToEmode(const CString & csMode)
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{
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if (csMode.Compare(L"0") == 0 || csMode.Compare(ToWchar(eActive)) == 0)
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{
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return eActive;
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}
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else if (csMode.Compare(L"1") == 0 || csMode.Compare(ToWchar(eFirstChance)) == 0)
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{
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return eFirstChance;
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}
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else if (csMode.Compare(L"2") == 0 || csMode.Compare(ToWchar(eSecondChance)) == 0)
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{
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return eSecondChance;
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}
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else if (csMode.Compare(L"3") == 0 || csMode.Compare(ToWchar(eExitProcess)) == 0)
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{
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return eExitProcess;
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}
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// Default value
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return eFirstChance;
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}
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static const DWORD DONT_CARE = 0xFFFFFFFF;
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/*++
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This is the list of all the exceptions that this shim can handle. The fields are
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1. cName - the name of the exception as accepted as a parameter and
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displayed in debug spew
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2. dwCode - the exception code
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3. dwSubCode - parameters specified by the exception: -1 = don't care
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4. dwIgnore - ignore this exception:
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0 = don't ignore
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1 = ignore 1st chance
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2 = ignore 2nd chance
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3 = exit process on 2nd chance.
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--*/
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struct EXCEPT
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{
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WCHAR * cName;
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DWORD dwCode;
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DWORD dwSubCode;
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EMODE dwIgnore;
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};
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static EXCEPT g_eList[] =
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{
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{L"ACCESS_VIOLATION_READ" , (DWORD)EXCEPTION_ACCESS_VIOLATION , 0 , eActive},
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{L"ACCESS_VIOLATION_WRITE" , (DWORD)EXCEPTION_ACCESS_VIOLATION , 1 , eActive},
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{L"ARRAY_BOUNDS_EXCEEDED" , (DWORD)EXCEPTION_ARRAY_BOUNDS_EXCEEDED , DONT_CARE, eActive},
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{L"BREAKPOINT" , (DWORD)EXCEPTION_BREAKPOINT , DONT_CARE, eActive},
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{L"DATATYPE_MISALIGNMENT" , (DWORD)EXCEPTION_DATATYPE_MISALIGNMENT , DONT_CARE, eActive},
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{L"FLT_DENORMAL_OPERAND" , (DWORD)EXCEPTION_FLT_DENORMAL_OPERAND , DONT_CARE, eActive},
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{L"FLT_DIVIDE_BY_ZERO" , (DWORD)EXCEPTION_FLT_DIVIDE_BY_ZERO , DONT_CARE, eActive},
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{L"FLT_INEXACT_RESULT" , (DWORD)EXCEPTION_FLT_INEXACT_RESULT , DONT_CARE, eActive},
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{L"FLT_INVALID_OPERATION" , (DWORD)EXCEPTION_FLT_INVALID_OPERATION , DONT_CARE, eActive},
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{L"FLT_OVERFLOW" , (DWORD)EXCEPTION_FLT_OVERFLOW , DONT_CARE, eActive},
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{L"FLT_STACK_CHECK" , (DWORD)EXCEPTION_FLT_STACK_CHECK , DONT_CARE, eActive},
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{L"FLT_UNDERFLOW" , (DWORD)EXCEPTION_FLT_UNDERFLOW , DONT_CARE, eActive},
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{L"ILLEGAL_INSTRUCTION" , (DWORD)EXCEPTION_ILLEGAL_INSTRUCTION , DONT_CARE, eActive},
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{L"IN_PAGE_ERROR" , (DWORD)EXCEPTION_IN_PAGE_ERROR , DONT_CARE, eActive},
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{L"INT_DIVIDE_BY_ZERO" , (DWORD)EXCEPTION_INT_DIVIDE_BY_ZERO , DONT_CARE, eActive},
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{L"INT_OVERFLOW" , (DWORD)EXCEPTION_INT_OVERFLOW , DONT_CARE, eActive},
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{L"INVALID_DISPOSITION" , (DWORD)EXCEPTION_INVALID_DISPOSITION , DONT_CARE, eActive},
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{L"NONCONTINUABLE_EXCEPTION" , (DWORD)EXCEPTION_NONCONTINUABLE_EXCEPTION, DONT_CARE, eActive},
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{L"PRIV_INSTRUCTION" , (DWORD)EXCEPTION_PRIV_INSTRUCTION , DONT_CARE, eFirstChance},
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{L"SINGLE_STEP" , (DWORD)EXCEPTION_SINGLE_STEP , DONT_CARE, eActive},
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{L"STACK_OVERFLOW" , (DWORD)EXCEPTION_STACK_OVERFLOW , DONT_CARE, eActive},
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{L"INVALID_HANDLE" , (DWORD)EXCEPTION_INVALID_HANDLE , DONT_CARE, eActive}
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};
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#define ELISTSIZE sizeof(g_eList) / sizeof(g_eList[0])
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/*++
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Custom exception handler.
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--*/
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LONG
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ExceptionFilter(
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struct _EXCEPTION_POINTERS *ExceptionInfo
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)
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{
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DWORD dwCode = ExceptionInfo->ExceptionRecord->ExceptionCode;
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if ((dwCode & DBG_EXCEPTION) == DBG_EXCEPTION) // for the DebugPrints
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{
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return EXCEPTION_CONTINUE_SEARCH;
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}
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CONTEXT *lpContext = ExceptionInfo->ContextRecord;
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const WCHAR * szException = L"Unknown";
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BOOL bIgnore = FALSE;
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//
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// Run the list of exceptions to see if we're ignoring it
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//
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for (int i = 0; i < ELISTSIZE; i++)
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{
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const EXCEPT *pE = g_eList + i;
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// Matched the major exception code
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if (dwCode == pE->dwCode)
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{
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// See if we care about the subcode
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if ((pE->dwSubCode != DONT_CARE) &&
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(ExceptionInfo->ExceptionRecord->ExceptionInformation[0] != pE->dwSubCode))
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{
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continue;
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}
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szException = pE->cName;
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// Determine how to handle the exception
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switch (pE->dwIgnore)
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{
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case eActive:
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bIgnore = FALSE;
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break;
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case eFirstChance:
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bIgnore = TRUE;
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break;
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case eSecondChance:
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bIgnore = g_bWin2000 || (g_dwLastEip == lpContext->Eip);
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g_dwLastEip = lpContext->Eip;
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break;
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case eExitProcess:
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// Try using unhandled exception filters to catch this
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bIgnore = TRUE;//g_bWin2000 || IsBadCodePtr((FARPROC)lpContext->Eip);
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if (bIgnore)
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{
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ExitProcess(0);
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}
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g_dwLastEip = lpContext->Eip;
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break;
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}
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if (bIgnore) break;
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}
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}
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//
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// Dump out the exception
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//
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DPFN( eDbgLevelWarning, "Exception %S (%08lx)\n",
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szException,
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dwCode);
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#ifdef DBG
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DPFN( eDbgLevelWarning, "eip=%08lx\n",
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lpContext->Eip);
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DPFN( eDbgLevelWarning, "eax=%08lx, ebx=%08lx, ecx=%08lx, edx=%08lx\n",
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lpContext->Eax,
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lpContext->Ebx,
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lpContext->Ecx,
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lpContext->Edx);
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DPFN( eDbgLevelWarning, "esi=%08lx, edi=%08lx, esp=%08lx, ebp=%08lx\n",
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lpContext->Esi,
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lpContext->Edi,
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lpContext->Esp,
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lpContext->Ebp);
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DPFN( eDbgLevelWarning, "cs=%04lx, ss=%04lx, ds=%04lx, es=%04lx, fs=%04lx, gs=%04lx\n",
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lpContext->SegCs,
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lpContext->SegSs,
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lpContext->SegDs,
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lpContext->SegEs,
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lpContext->SegFs,
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lpContext->SegGs);
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#endif
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LONG lRet;
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if (bIgnore)
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{
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if ((DWORD)lpContext->Eip <= (DWORD)0xFFFF)
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{
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LOGN( eDbgLevelError, "[ExceptionFilter] Exception %S (%08X), stuck at bad address, killing current thread.", szException, dwCode);
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lRet = EXCEPTION_CONTINUE_SEARCH;
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return lRet;
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}
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LOGN( eDbgLevelWarning, "[ExceptionFilter] Exception %S (%08X) ignored.", szException, dwCode);
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lpContext->Eip += GetInstructionLengthFromAddress((LPBYTE)lpContext->Eip);
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g_dwLastEip = 0;
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lRet = EXCEPTION_CONTINUE_EXECUTION;
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}
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else
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{
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DPFN( eDbgLevelWarning, "Exception NOT handled\n\n");
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lRet = EXCEPTION_CONTINUE_SEARCH;
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}
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return lRet;
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}
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/*++
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Parse the command line for particular exceptions. The format of the command
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line is:
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[EXCEPTION_NAME[:0|1|2]];[EXCEPTION_NAME[:0|1|2]]...
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or "*" which ignores all first chance exceptions.
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Eg:
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ACCESS_VIOLATION:2;PRIV_INSTRUCTION:0;BREAKPOINT
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Will ignore:
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1. Access violations - second chance
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2. Priviliged mode instructions - do not ignore
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3. Breakpoints - ignore
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--*/
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BOOL
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ParseCommandLine(
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LPCSTR lpCommandLine
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)
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{
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CSTRING_TRY
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{
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CStringToken csTok(lpCommandLine, L" ;");
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//
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// Run the string, looking for exception names
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//
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CString token;
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// Each cl token may be followed by a : and an exception type
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// Forms can be:
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// *
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// *:SecondChance
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// INVALID_DISPOSITION
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// INVALID_DISPOSITION:Active
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// INVALID_DISPOSITION:0
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//
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while (csTok.GetToken(token))
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{
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CStringToken csSingleTok(token, L":");
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CString csExcept;
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CString csType;
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// grab the exception name and the exception type
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csSingleTok.GetToken(csExcept);
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csSingleTok.GetToken(csType);
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// Convert ignore value to emode (defaults to eFirstChance)
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EMODE emode = ToEmode(csType);
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if (token.Compare(L"*") == 0)
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{
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for (int i = 0; i < ELISTSIZE; i++)
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{
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g_eList[i].dwIgnore = emode;
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}
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}
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else
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{
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// Find the exception specified
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for (int i = 0; i < ELISTSIZE; i++)
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{
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if (csExcept.CompareNoCase(g_eList[i].cName) == 0)
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{
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g_eList[i].dwIgnore = emode;
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break;
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}
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}
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}
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}
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}
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CSTRING_CATCH
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{
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return FALSE;
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}
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//
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// Dump results of command line parse
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//
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DPFN( eDbgLevelInfo, "===================================\n");
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DPFN( eDbgLevelInfo, " Ignore Exception \n");
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DPFN( eDbgLevelInfo, "===================================\n");
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DPFN( eDbgLevelInfo, " 1 = First chance \n");
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|
DPFN( eDbgLevelInfo, " 2 = Second chance \n");
|
||
|
|
DPFN( eDbgLevelInfo, " 3 = ExitProcess on second chance \n");
|
||
|
|
DPFN( eDbgLevelInfo, "-----------------------------------\n");
|
||
|
|
for (int i = 0; i < ELISTSIZE; i++)
|
||
|
|
{
|
||
|
|
if (g_eList[i].dwIgnore != eActive)
|
||
|
|
{
|
||
|
|
DPFN( eDbgLevelInfo, "%S %S\n", ToWchar(g_eList[i].dwIgnore), g_eList[i].cName);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
DPFN( eDbgLevelInfo, "-----------------------------------\n");
|
||
|
|
|
||
|
|
return TRUE;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*++
|
||
|
|
|
||
|
|
Register hooked functions
|
||
|
|
|
||
|
|
--*/
|
||
|
|
|
||
|
|
BOOL
|
||
|
|
NOTIFY_FUNCTION(
|
||
|
|
DWORD fdwReason)
|
||
|
|
{
|
||
|
|
if (fdwReason == DLL_PROCESS_ATTACH)
|
||
|
|
{
|
||
|
|
// Run the command line to check for adjustments to defaults
|
||
|
|
if (!ParseCommandLine(COMMAND_LINE))
|
||
|
|
{
|
||
|
|
return FALSE;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Try to find new exception handler
|
||
|
|
_pfn_RtlAddVectoredExceptionHandler pfnExcept;
|
||
|
|
pfnExcept = (_pfn_RtlAddVectoredExceptionHandler)
|
||
|
|
GetProcAddress(
|
||
|
|
GetModuleHandle(L"NTDLL.DLL"),
|
||
|
|
"RtlAddVectoredExceptionHandler");
|
||
|
|
|
||
|
|
if (pfnExcept)
|
||
|
|
{
|
||
|
|
(_pfn_RtlAddVectoredExceptionHandler) pfnExcept(
|
||
|
|
0,
|
||
|
|
(PVOID)ExceptionFilter);
|
||
|
|
g_bWin2000 = FALSE;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// Windows 2000 reverts back to the old method which unluckily
|
||
|
|
// doesn't get called for C++ exceptions
|
||
|
|
|
||
|
|
SetUnhandledExceptionFilter(ExceptionFilter);
|
||
|
|
g_bWin2000 = TRUE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return TRUE;
|
||
|
|
}
|
||
|
|
|
||
|
|
HOOK_BEGIN
|
||
|
|
|
||
|
|
CALL_NOTIFY_FUNCTION
|
||
|
|
|
||
|
|
HOOK_END
|
||
|
|
|
||
|
|
IMPLEMENT_SHIM_END
|
||
|
|
|