__security_init_cookie

Initializes the global security cookie.

void __security_init_cookie(void);

Remarks

The global security cookie is used for buffer overrun protection in code compiled with /GS (Buffer Security Check) and in code that uses exception handling. Essentially, on entry to an overrun-protected function, the cookie is put on the stack, and on exit, the value on the stack is compared against the global cookie. Any difference between them indicates that a buffer overrun has occurred and results in immediate termination of the program.

Normally, __security_init_cookie is called by the CRT when it starts up. If you bypass CRT initialization (for example, by writing a DLL and specifying an entry-point with /ENTRY), then you must call __security_init_cookie yourself.

The call to __security_init_cookie must be made before any overrun-protected function is entered; otherwise a spurious buffer overrun will be detected. For more information, see C Run-Time Error R6035.

Example

See the examples in C Run-Time Error R6035.

Requirements

For more compatibility information, see Compatibility in the Introduction.

.NET Framework Equivalent

Not applicable. This function should only be called from native code, not managed.

See Also

Reference

Compiler Security Checks In Depth