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lib/tests: Add randstruct KUnit test

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Perform basic validation about layout randomization and initialization
tracking when using CONFIG_RANDSTRUCT=y. Tested using:

$ ./tools/testing/kunit/kunit.py run \
	--kconfig_add CONFIG_RANDSTRUCT_FULL=y \
	randstruct
[17:22:30] ================= randstruct (2 subtests) ==================
[17:22:30] [PASSED] randstruct_layout
[17:22:30] [PASSED] randstruct_initializers
[17:22:30] =================== [PASSED] randstruct ====================
[17:22:30] ============================================================
[17:22:30] Testing complete. Ran 2 tests: passed: 2
[17:22:30] Elapsed time: 5.091s total, 0.001s configuring, 4.974s building, 0.086s running

Adding "--make_option LLVM=1" can be used to test Clang, which also
passes.

Acked-by: David Gow <davidgow@google.com>
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Kees Cook
2025-04-26 17:21:01 -07:00
parent e136a40621
commit b370f7eacd
4 changed files with 293 additions and 0 deletions
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8
lib/Kconfig.debug
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@@ -2863,6 +2863,14 @@ config OVERFLOW_KUNIT_TEST
If unsure, say N.
config RANDSTRUCT_KUNIT_TEST
tristate "Test randstruct structure layout randomization at runtime" if !KUNIT_ALL_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
help
Builds unit tests for the checking CONFIG_RANDSTRUCT=y, which
randomizes structure layouts.
config STACKINIT_KUNIT_TEST
tristate "Test level of stack variable initialization" if !KUNIT_ALL_TESTS
depends on KUNIT