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authorOliver Glitta <glittao@gmail.com>2021-06-28 19:34:33 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-06-29 10:53:46 -0700
commit1f9f78b1b376f82cdd8ed73cc0abdb74d0453d43 (patch)
tree1b2cbf976a0b729a4b66e38c37403a39f0d538af /lib/Kconfig.debug
parent26c6cb7cf830349c6518a7efe1c32ac796cd192e (diff)
mm/slub, kunit: add a KUnit test for SLUB debugging functionality
SLUB has resiliency_test() function which is hidden behind #ifdef SLUB_RESILIENCY_TEST that is not part of Kconfig, so nobody runs it. KUnit should be a proper replacement for it. Try changing byte in redzone after allocation and changing pointer to next free node, first byte, 50th byte and redzone byte. Check if validation finds errors. There are several differences from the original resiliency test: Tests create own caches with known state instead of corrupting shared kmalloc caches. The corruption of freepointer uses correct offset, the original resiliency test got broken with freepointer changes. Scratch changing random byte test, because it does not have meaning in this form where we need deterministic results. Add new option CONFIG_SLUB_KUNIT_TEST in Kconfig. Tests next_pointer, first_word and clobber_50th_byte do not run with KASAN option on. Because the test deliberately modifies non-allocated objects. Use kunit_resource to count errors in cache and silence bug reports. Count error whenever slab_bug() or slab_fix() is called or when the count of pages is wrong. [glittao@gmail.com: remove unused function test_exit(), from SLUB KUnit test] Link: https://lkml.kernel.org/r/20210512140656.12083-1-glittao@gmail.com [akpm@linux-foundation.org: export kasan_enable/disable_current to modules] Link: https://lkml.kernel.org/r/20210511150734.3492-2-glittao@gmail.com Signed-off-by: Oliver Glitta <glittao@gmail.com> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Daniel Latypov <dlatypov@google.com> Acked-by: Marco Elver <elver@google.com> Cc: Brendan Higgins <brendanhiggins@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Pekka Enberg <penberg@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/Kconfig.debug')
-rw-r--r--lib/Kconfig.debug12
1 files changed, 12 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 678c13967580..7723f58a9394 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2429,6 +2429,18 @@ config BITS_TEST
If unsure, say N.
+config SLUB_KUNIT_TEST
+ tristate "KUnit test for SLUB cache error detection" if !KUNIT_ALL_TESTS
+ depends on SLUB_DEBUG && KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ This builds SLUB allocator unit test.
+ Tests SLUB cache debugging functionality.
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
config TEST_UDELAY
tristate "udelay test driver"
help