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Doge wuz here. Also barkies.

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This commit is contained in:
Shibe Doge
2015-01-13 17:31:20 -05:00
parent dd4f2e857b
commit 4d29117148
1 changed files with 23 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
indra/llplugin/slplugin/slplugin.cpp
View File

@@ -91,45 +91,35 @@ LONG WINAPI myWin32ExceptionHandler( struct _EXCEPTION_POINTERS* exception_infop
return EXCEPTION_EXECUTE_HANDLER;
}
// Taken from : http://blog.kalmbachnet.de/?postid=75
// The MSVC 2005 CRT forces the call of the default-debugger (normally Dr.Watson)
// Taken from : http://blog.kalmbach-software.de/2013/05/23/improvedpreventsetunhandledexceptionfilter/
// The MSVC 2005 and above CRT forces the call of the default-debugger (normally Dr.Watson)
// even with the other exception handling code. This (terrifying) piece of code
// patches things so that doesn't happen.
LPTOP_LEVEL_EXCEPTION_FILTER WINAPI MyDummySetUnhandledExceptionFilter(
LPTOP_LEVEL_EXCEPTION_FILTER lpTopLevelExceptionFilter )
static BOOL PreventSetUnhandledExceptionFilter()
{
return NULL;
}
HMODULE hKernel32 = LoadLibrary(TEXT("kernel32.dll"));
if (hKernel32 == NULL) return FALSE;
void *pOrgEntry = GetProcAddress(hKernel32, "SetUnhandledExceptionFilter");
if (pOrgEntry == NULL) return FALSE;
BOOL PreventSetUnhandledExceptionFilter()
{
// WARNING: This won't work on 64-bit Windows systems so we turn it off it.
// It should work for any flavor of 32-bit Windows we care about.
// If it's off, sometimes you will see an OS message when a plugin crashes
#ifndef _WIN64
HMODULE hKernel32 = LoadLibraryA( "kernel32.dll" );
if ( NULL == hKernel32 )
return FALSE;
void *pOrgEntry = GetProcAddress( hKernel32, "SetUnhandledExceptionFilter" );
if( NULL == pOrgEntry )
return FALSE;
unsigned char newJump[ 100 ];
DWORD dwOrgEntryAddr = (DWORD)pOrgEntry;
dwOrgEntryAddr += 5; // add 5 for 5 op-codes for jmp far
void *pNewFunc = &MyDummySetUnhandledExceptionFilter;
DWORD dwNewEntryAddr = (DWORD) pNewFunc;
DWORD dwRelativeAddr = dwNewEntryAddr - dwOrgEntryAddr;
newJump[ 0 ] = 0xE9; // JMP absolute
memcpy( &newJump[ 1 ], &dwRelativeAddr, sizeof( pNewFunc ) );
SIZE_T bytesWritten;
BOOL bRet = WriteProcessMemory( GetCurrentProcess(), pOrgEntry, newJump, sizeof( pNewFunc ) + 1, &bytesWritten );
return bRet;
#ifdef _M_IX86
// Code for x86:
// 33 C0 xor eax,eax
// C2 04 00 ret 4
unsigned char szExecute[] = { 0x33, 0xC0, 0xC2, 0x04, 0x00 };
#elif _M_X64
// 33 C0 xor eax,eax
// C3 ret
unsigned char szExecute[] = { 0x33, 0xC0, 0xC3 };
#else
return FALSE;
#error "The following code only works for x86 and x64!"
#endif
DWORD oldProtect;
BOOL bRet = VirtualProtect(pOrgEntry, sizeof(szExecute), PAGE_EXECUTE_READWRITE, &oldProtect);
memcpy(pOrgEntry, szExecute, sizeof(szExecute));
VirtualProtect(pOrgEntry, sizeof(szExecute), oldProtect, &oldProtect);
return bRet;
}
////////////////////////////////////////////////////////////////////////////////