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kmsan: add test_stackdepot_roundtrip

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Ensure that KMSAN does not report false positives in instrumented callers
of stack_depot_save(), stack_depot_print(), and stack_depot_fetch().

Link: https://lkml.kernel.org/r/20230306111322.205724-2-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Cc: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alexander Potapenko 2023-03-06 12:13:22 +01:00 committed by Andrew Morton
parent 8e00b2dffd
commit 6204c9ab4a
1 changed files with 31 additions and 0 deletions
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31
mm/kmsan/kmsan_test.c
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@ -551,6 +551,36 @@ static void test_long_origin_chain(struct kunit *test)
KUNIT_EXPECT_TRUE(test, report_matches(&expect));
}
/*
* Test case: ensure that saving/restoring/printing stacks to/from stackdepot
* does not trigger errors.
*
* KMSAN uses stackdepot to store origin stack traces, that's why we do not
* instrument lib/stackdepot.c. Yet it must properly mark its outputs as
* initialized because other kernel features (e.g. netdev tracker) may also
* access stackdepot from instrumented code.
*/
static void test_stackdepot_roundtrip(struct kunit *test)
{
unsigned long src_entries[16], *dst_entries;
unsigned int src_nentries, dst_nentries;
EXPECTATION_NO_REPORT(expect);
depot_stack_handle_t handle;
kunit_info(test, "testing stackdepot roundtrip (no reports)\n");
src_nentries =
stack_trace_save(src_entries, ARRAY_SIZE(src_entries), 1);
handle = stack_depot_save(src_entries, src_nentries, GFP_KERNEL);
stack_depot_print(handle);
dst_nentries = stack_depot_fetch(handle, &dst_entries);
KUNIT_EXPECT_TRUE(test, src_nentries == dst_nentries);
kmsan_check_memory((void *)dst_entries,
sizeof(*dst_entries) * dst_nentries);
KUNIT_EXPECT_TRUE(test, report_matches(&expect));
}
static struct kunit_case kmsan_test_cases[] = {
KUNIT_CASE(test_uninit_kmalloc),
KUNIT_CASE(test_init_kmalloc),
@ -573,6 +603,7 @@ static struct kunit_case kmsan_test_cases[] = {
KUNIT_CASE(test_memset32),
KUNIT_CASE(test_memset64),
KUNIT_CASE(test_long_origin_chain),
KUNIT_CASE(test_stackdepot_roundtrip),
{},
};