From: Marco Elver <elver@google.com>
Date: Thu, 22 Oct 2020 11:45:52 +0000 (+0200)
Subject: kcsan: selftest: Ensure that address is at least PAGE_SIZE
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4761612ffe3c1655e58f1ef9cf867c6f67d46fe2;p=linux.git

kcsan: selftest: Ensure that address is at least PAGE_SIZE

In preparation of supporting only addresses not within the NULL page,
change the selftest to never use addresses that are less than PAGE_SIZE.

Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---

diff --git a/kernel/kcsan/selftest.c b/kernel/kcsan/selftest.c
index d98bc208d06db..9014a3a82cf9c 100644
--- a/kernel/kcsan/selftest.c
+++ b/kernel/kcsan/selftest.c
@@ -33,6 +33,9 @@ static bool test_encode_decode(void)
 		unsigned long addr;
 
 		prandom_bytes(&addr, sizeof(addr));
+		if (addr < PAGE_SIZE)
+			addr = PAGE_SIZE;
+
 		if (WARN_ON(!check_encodable(addr, size)))
 			return false;