linux-kernel - [PATCH] kcsan: remove rng selftest

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Date:   Sun, 16 Oct 2022 22:43:45 -0600
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     elver@...gle.com, dvyukov@...gle.com, kasan-dev@...glegroups.com,
        linux-kernel@...r.kernel.org
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>
Subject: [PATCH] kcsan: remove rng selftest

The first test of the kcsan selftest appears to test if get_random_u32()
returns two zeros in a row, and requires that it doesn't. This seems
like a bogus critera. Remove it.

Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
---
 kernel/kcsan/selftest.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/kernel/kcsan/selftest.c b/kernel/kcsan/selftest.c
index 00cdf8fa5693..1740ce389e7f 100644
--- a/kernel/kcsan/selftest.c
+++ b/kernel/kcsan/selftest.c
@@ -22,13 +22,6 @@
 
 #define ITERS_PER_TEST 2000
 
-/* Test requirements. */
-static bool __init test_requires(void)
-{
-	/* random should be initialized for the below tests */
-	return get_random_u32() + get_random_u32() != 0;
-}
-
 /*
  * Test watchpoint encode and decode: check that encoding some access's info,
  * and then subsequent decode preserves the access's info.
@@ -259,7 +252,6 @@ static int __init kcsan_selftest(void)
 			pr_err("selftest: " #do_test " failed");               \
 	} while (0)
 
-	RUN_TEST(test_requires);
 	RUN_TEST(test_encode_decode);
 	RUN_TEST(test_matching_access);
 	RUN_TEST(test_barrier);
-- 
2.37.3