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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (c) 2020 SUSE LLC <mdoucha@suse.cz>
*/
#ifndef TST_MEMUTILS_H__
#define TST_MEMUTILS_H__
/*
* Fill up to maxsize physical memory with fillchar, then free it for reuse.
* If maxsize is zero, fill as much memory as possible. This function is
* intended for data disclosure vulnerability tests to reduce the probability
* that a vulnerable kernel will leak a block of memory that was full of
* zeroes by chance.
*
* The function keeps a safety margin to avoid invoking OOM killer and
* respects the limitations of available address space. (Less than 3GB can be
* polluted on a 32bit system regardless of available physical RAM.)
*/
void tst_pollute_memory(size_t maxsize, int fillchar);
#endif /* TST_MEMUTILS_H__ */
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