__security_init_cookie.c File Reference

#include <internal_shared.h>

Include dependency graph for __security_init_cookie.c:

Go to the source code of this file.

Macros
#define	DEFAULT_SECURITY_COOKIE   0xBB40E64E
#define	_rotlptr   _rotl

Functions
void	__security_init_cookie (void)

Variables
uintptr_t	__security_cookie = DEFAULT_SECURITY_COOKIE
uintptr_t	__security_cookie_complement = ~DEFAULT_SECURITY_COOKIE

Macro Definition Documentation

_rotlptr

#define _rotlptr   _rotl

Definition at line 18 of file __security_init_cookie.c.

DEFAULT_SECURITY_COOKIE

#define DEFAULT_SECURITY_COOKIE   0xBB40E64E

Definition at line 17 of file __security_init_cookie.c.

Function Documentation

__security_init_cookie()

void __security_init_cookie

(

void

)

Definition at line 24 of file __security_init_cookie.c.

{
    LARGE_INTEGER performanceCounter;
    FILETIME fileTime;
    uintptr_t randomValue = (uintptr_t)0x27E30B2C16B07297ull;
 
#if defined(_M_IX86) || defined(_M_X64)
    if (IsProcessorFeaturePresent(PF_RDRAND_INSTRUCTION_AVAILABLE))
    {
#ifdef _M_X64
        while (!_rdrand64_step(&randomValue))
            _mm_pause();
#else
        while (!_rdrand32_step(&randomValue))
            _mm_pause();
#endif
    }
 
    if (IsProcessorFeaturePresent(PF_RDTSC_INSTRUCTION_AVAILABLE))
    {
        randomValue += __rdtsc();
    }
#endif
 
    randomValue += (uintptr_t)&randomValue;
    randomValue ^= GetTickCount();
 
    QueryPerformanceCounter(&performanceCounter);
#ifdef _WIN64
    randomValue ^= performanceCounter.QuadPart;
#else
    randomValue ^= performanceCounter.LowPart;
    randomValue ^= performanceCounter.HighPart;
#endif
 
    randomValue += GetCurrentThreadId();
    randomValue = _rotlptr(randomValue, GetCurrentThreadId() >> 2);
 
#if (_WIN32_WINNT >= _WIN32_WINNT_WIN8)
    GetSystemTimePreciseAsFileTime(&fileTime);
#else
    GetSystemTimeAsFileTime(&fileTime);
#endif
    randomValue += fileTime.dwLowDateTime;
    randomValue += fileTime.dwHighDateTime;
 
    randomValue += GetCurrentProcessId();
    randomValue = _rotlptr(randomValue, GetCurrentProcessId() >> 2);
 
    if (randomValue == DEFAULT_SECURITY_COOKIE)
    {
        randomValue++;
    }
 
#ifdef _WIN64
    /* Zero out highest 16 bits */
    randomValue &= 0x0000FFFFFFFFFFFFull;
#endif
 
    __security_cookie = randomValue;
    __security_cookie_complement = ~randomValue;
}

Referenced by __acrt_DllMain(), _IRQL_requires_max_(), mainCRTStartup(), and wmainCRTStartup().

Variable Documentation

__security_cookie

uintptr_t __security_cookie = DEFAULT_SECURITY_COOKIE

Definition at line 21 of file __security_init_cookie.c.

Referenced by __security_init_cookie(), _get_printf_count_output(), and _set_printf_count_output().

__security_cookie_complement

uintptr_t __security_cookie_complement = ~DEFAULT_SECURITY_COOKIE

Definition at line 22 of file __security_init_cookie.c.

Referenced by __security_init_cookie().