[thirdparty/squid.git] / src / mem / Sensitive.h

/*
 * Copyright (C) 1996-2022 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */

#ifndef SQUID_SRC_MEM_SENSITIVE_H
#define SQUID_SRC_MEM_SENSITIVE_H

#include <cstring>

namespace Mem {

/// zeros the given memory area while disallowing the compiler to skip (i.e.
/// optimize away) this cleanup, unlike a regular call to std::memset() or alike
inline void
ZeroSensitiveMemory(void *dst, const size_t len)
{
    if (!len)
        return;

    assert(dst);

    volatile const auto setMemory = &std::memset;
    (void)setMemory(dst, 0, len);
}

} // namespace mem

#endif /* SQUID_SRC_MEM_SENSITIVE_H */
Commit	Line	Data
2d6a38a5	1	/*
7c6a034c	2	* Copyright (C) 1996-2022 The Squid Software Foundation and contributors
2d6a38a5 DC	3	*
	4	* Squid software is distributed under GPLv2+ license and includes
	5	* contributions from numerous individuals and organizations.
	6	* Please see the COPYING and CONTRIBUTORS files for details.
	7	*/
	8
	9	#ifndef SQUID_SRC_MEM_SENSITIVE_H
	10	#define SQUID_SRC_MEM_SENSITIVE_H
	11
	12	#include <cstring>
	13
	14	namespace Mem {
	15
	16	/// zeros the given memory area while disallowing the compiler to skip (i.e.
	17	/// optimize away) this cleanup, unlike a regular call to std::memset() or alike
	18	inline void
	19	ZeroSensitiveMemory(void *dst, const size_t len)
	20	{
	21	if (!len)
	22	return;
	23
	24	assert(dst);
	25
	26	volatile const auto setMemory = &std::memset;
	27	(void)setMemory(dst, 0, len);
	28	}
	29
	30	} // namespace mem
	31
	32	#endif /* SQUID_SRC_MEM_SENSITIVE_H */
	33