Leaked source code of windows server 2003
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/***
*seccook.c - defines buffer overrun security cookie** Copyright (c) 2000-2001, Microsoft Corporation. All rights reserved.**Purpose:* Defines per-module global variable __security_cookie, which is used* by the /GS compile switch to detect local buffer variable overrun* bugs/attacks.** When compiling /GS, the compiler injects code to detect when a local* array variable has been overwritten, potentially overwriting the* return address (on machines like x86 where the return address is on* the stack). A local variable is allocated directly before the return* address and initialized on entering the function. When exiting the* function, the compiler inserts code to verify that the local variable* has not been modified. If it has, then an error reporting routine* is called.** NOTE: The ATLMINCRT library includes a version of this file. If any* changes are made here, they should be duplicated in the ATL version.**Revision History:* 01-24-00 PML Created.* 08-09-00 PML Preserve EAX on non-failure case (VS7#147203). Also* make sure failure case never returns.* 08-29-00 PML Rename handlers, add extra parameters. Move most of* system CRT version over to seclocf.c.* 09-16-00 PML Initialize global cookie earlier, and give it a nonzero* static initialization (vs7#162619).* 03-07-02 PML Split into seccook.c and secchk.c.********************************************************************************/
#include <internal.h>
#include <windows.h>
/*
* The global security cookie. This name is known to the compiler. * Initialize to a garbage non-zero value just in case we have a buffer overrun * in any code that gets run before __security_init_cookie() has a chance to * initialize the cookie to the final value. */
DECLSPEC_SELECTANY DWORD_PTR __security_cookie = DEFAULT_SECURITY_COOKIE;
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