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/* $Id: chk_stubs.c $ */
/** @file
* glibc stubs for the VirtualBox Guest Addition X11 Client.
*/
/*
* Copyright (C) 2018-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
/* If we want the binary to be usable with glibc 2.3, we have to prevent
VBoxClient from containing later symbols. This includes resolution of
symbols from supc++ and gcc_eh. */
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
extern int __sprintf_chk(char *psz, int fFlags, size_t cb, const char *pszFormat, ...);
int __sprintf_chk(char *psz, int fFlags, size_t cb, const char *pszFormat, ...)
{
int rc;
va_list va;
(void)fFlags;
va_start(va, pszFormat);
rc = vsnprintf(psz, cb, pszFormat, va);
va_end(va);
return rc;
}
extern void __stack_chk_fail(void);
void __stack_chk_fail(void)
{
fprintf(stderr, "Stack check failed!\n");
_exit(1);
}
#ifdef __x86_64
/* Furthermore, wrap references to memcpy to force them to go to the right
* version. We are forced to do it this way because the shared libraries
* supc++ and gcc_eh contain references which we cannot change. */
extern void *__wrap_memcpy(void *dest, const void *src, size_t n);
asm (".symver memcpy, memcpy@GLIBC_2.2.5");
void *__wrap_memcpy(void *dest, const void *src, size_t n)
{
return memcpy(dest, src, n);
}
#endif
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