gs_support.c File Reference

#include <stdlib.h>
#include <stdarg.h>
#include <windef.h>
#include <winbase.h>
#include <ntstatus.h>

Include dependency graph for gs_support.c:

Go to the source code of this file.

Classes
union	FT

Macros
#define	_NTSYSTEM_
#define	WIN32_LEAN_AND_MEAN
#define	WIN32_NO_STATUS
#define	DEFAULT_SECURITY_COOKIE   0xBB40E64E
#define	UNW_FLAG_NHANDLER   0x00

Typedefs
typedef LONG	NTSTATUS

Functions
void __cdecl	__security_init_cookie (void)
	__declspec (noreturn)

Variables
static EXCEPTION_RECORD	GS_ExceptionRecord
static CONTEXT	GS_ContextRecord
static const EXCEPTION_POINTERS	GS_ExceptionPointers
DECLSPEC_SELECTANY UINT_PTR	__security_cookie = DEFAULT_SECURITY_COOKIE
DECLSPEC_SELECTANY UINT_PTR	__security_cookie_complement = ~(DEFAULT_SECURITY_COOKIE)

Macro Definition Documentation

_NTSYSTEM_

#define _NTSYSTEM_

This file has no copyright assigned and is placed in the Public Domain. This file is part of the w64 mingw-runtime package. No warranty is given; refer to the file DISCLAIMER.PD within this package.

Definition at line 6 of file gs_support.c.

DEFAULT_SECURITY_COOKIE

#define DEFAULT_SECURITY_COOKIE   0xBB40E64E

Definition at line 25 of file gs_support.c.

UNW_FLAG_NHANDLER

#define UNW_FLAG_NHANDLER   0x00

Definition at line 32 of file gs_support.c.

WIN32_LEAN_AND_MEAN

#define WIN32_LEAN_AND_MEAN

Definition at line 8 of file gs_support.c.

WIN32_NO_STATUS

#define WIN32_NO_STATUS

Definition at line 10 of file gs_support.c.

Typedef Documentation

NTSTATUS

typedef LONG NTSTATUS

Definition at line 30 of file gs_support.c.

Function Documentation

__declspec()

__declspec

(

noreturn

)

Definition at line 105 of file gs_support.c.

{
  volatile UINT_PTR cookie[2] __MINGW_ATTRIB_UNUSED;
#ifdef _WIN64
  ULONG64 controlPC, imgBase, establisherFrame;
  PRUNTIME_FUNCTION fctEntry;
  PVOID hndData;
 
  RtlCaptureContext (&GS_ContextRecord);
  controlPC = GS_ContextRecord.Rip;
  fctEntry = RtlLookupFunctionEntry(controlPC, &imgBase, NULL);
  if (fctEntry != NULL)
    {
      RtlVirtualUnwind (UNW_FLAG_NHANDLER, imgBase, controlPC, fctEntry,
            &GS_ContextRecord, &hndData, &establisherFrame, NULL);
    }
  else
#endif /* _WIN64 */
    {
#ifdef _WIN64
      GS_ContextRecord.Rip = (ULONGLONG) _ReturnAddress();
      GS_ContextRecord.Rsp = (ULONGLONG) _AddressOfReturnAddress() + 8;
#else
      GS_ContextRecord.Eip = (DWORD) _ReturnAddress();
      GS_ContextRecord.Esp = (DWORD) _AddressOfReturnAddress() + 4;
#endif /* _WIN64 */
    }
 
#ifdef _WIN64
  GS_ExceptionRecord.ExceptionAddress = (PVOID) GS_ContextRecord.Rip;
  GS_ContextRecord.Rcx = StackCookie;
#else
  GS_ExceptionRecord.ExceptionAddress = (PVOID) GS_ContextRecord.Eip;
  GS_ContextRecord.Ecx = StackCookie;
#endif /* _WIN64 */
  GS_ExceptionRecord.ExceptionCode = STATUS_STACK_BUFFER_OVERRUN;
  GS_ExceptionRecord.ExceptionFlags = EXCEPTION_NONCONTINUABLE;
  cookie[0] = __security_cookie;
  cookie[1] = __security_cookie_complement;
  SetUnhandledExceptionFilter (NULL);
  UnhandledExceptionFilter ((EXCEPTION_POINTERS *) &GS_ExceptionPointers);
  TerminateProcess (GetCurrentProcess (), STATUS_STACK_BUFFER_OVERRUN);
  abort();
}

__security_init_cookie()

void __cdecl __security_init_cookie

(

void

)

Definition at line 55 of file gs_support.c.

{
  UINT_PTR cookie;
  FT systime = { 0, };
  LARGE_INTEGER perfctr;
 
  if (__security_cookie != DEFAULT_SECURITY_COOKIE)
    {
      __security_cookie_complement = ~__security_cookie;
      return;
    }
 
  GetSystemTimeAsFileTime (&systime.ft_struct);
#ifdef _WIN64
  cookie = systime.ft_scalar;
#else
  cookie = systime.ft_struct.dwLowDateTime;
  cookie ^= systime.ft_struct.dwHighDateTime;
#endif
 
  cookie ^= GetCurrentProcessId ();
  cookie ^= GetCurrentThreadId ();
  cookie ^= GetTickCount ();
 
  QueryPerformanceCounter (&perfctr);
#ifdef _WIN64
  cookie ^= perfctr.QuadPart;
#else
  cookie ^= perfctr.LowPart;
  cookie ^= perfctr.HighPart;
#endif
 
#ifdef _WIN64
  cookie &= 0x0000ffffffffffffll;
#endif
 
  if (cookie == DEFAULT_SECURITY_COOKIE)
    cookie = DEFAULT_SECURITY_COOKIE + 1;
  __security_cookie = cookie;
  __security_cookie_complement = ~cookie;
}

Variable Documentation

__security_cookie

DECLSPEC_SELECTANY UINT_PTR __security_cookie = DEFAULT_SECURITY_COOKIE

Definition at line 49 of file gs_support.c.

Referenced by __security_init_cookie().

__security_cookie_complement

DECLSPEC_SELECTANY UINT_PTR __security_cookie_complement = ~(DEFAULT_SECURITY_COOKIE)

Definition at line 50 of file gs_support.c.

Referenced by __security_init_cookie().

GS_ContextRecord

CONTEXT GS_ContextRecord

static

Definition at line 42 of file gs_support.c.

GS_ExceptionPointers

const EXCEPTION_POINTERS GS_ExceptionPointers

static

Initial value:

= {
  &GS_ExceptionRecord,&GS_ContextRecord
}

Definition at line 44 of file gs_support.c.

GS_ExceptionRecord

EXCEPTION_RECORD GS_ExceptionRecord

static

Definition at line 41 of file gs_support.c.