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