Add an mseal test for madvise() operations that aren't considered
"discard" (e.g purely advisory ops such as MADV_RANDOM).
Signed-off-by: Pedro Falcato <pedro.falcato@xxxxxxxxx>
---
tools/testing/selftests/mm/mseal_test.c | 34 +++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/tools/testing/selftests/mm/mseal_test.c b/tools/testing/selftests/mm/mseal_test.c
index a818f010de4..2dcda7440eb 100644
--- a/tools/testing/selftests/mm/mseal_test.c
+++ b/tools/testing/selftests/mm/mseal_test.c
@@ -1731,6 +1731,38 @@ static void test_seal_discard_ro_anon(bool seal)
REPORT_TEST_PASS();
}
+static void test_seal_madvise_nodiscard(bool seal)
+{
+ void *ptr;
+ unsigned long page_size = getpagesize();
+ unsigned long size = 4 * page_size;
+ int ret;
+
+ setup_single_address(size, &ptr);
+ FAIL_TEST_IF_FALSE(ptr != (void *)-1);
+
+ if (seal) {
+ ret = seal_single_address(ptr, size);
+ FAIL_TEST_IF_FALSE(!ret);
+ }
+
+ /*
+ * Test a random madvise flag like MADV_RANDOM that does not touch page
+ * contents (and thus should work for msealed VMAs). RANDOM also happens to
+ * share bits with other discard-ish flags like REMOVE.
+ */
+ ret = sys_madvise(ptr, size, MADV_RANDOM);
+ FAIL_TEST_IF_FALSE(!ret);
+
+ ret = sys_munmap(ptr, size);
+ if (seal)
+ FAIL_TEST_IF_FALSE(ret < 0);
+ else
+ FAIL_TEST_IF_FALSE(!ret);
+
+ REPORT_TEST_PASS();
+}
+
int main(int argc, char **argv)
{
bool test_seal = seal_support();
@@ -1822,6 +1854,8 @@ int main(int argc, char **argv)
test_seal_mremap_move_fixed_zero(true);
test_seal_mremap_move_dontunmap_anyaddr(false);
test_seal_mremap_move_dontunmap_anyaddr(true);
+ test_seal_madvise_nodiscard(false);
+ test_seal_madvise_nodiscard(true);
test_seal_discard_ro_anon(false);
test_seal_discard_ro_anon(true);
test_seal_discard_ro_anon_on_rw(false);
--
2.46.0
