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Diffstat (limited to 'src/kernel/tests/include/tst_memutils.h')
| -rw-r--r-- | src/kernel/tests/include/tst_memutils.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/kernel/tests/include/tst_memutils.h b/src/kernel/tests/include/tst_memutils.h new file mode 100644 index 0000000..91dad07 --- /dev/null +++ b/src/kernel/tests/include/tst_memutils.h @@ -0,0 +1,22 @@ +/* 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__ */ |