linux-kernel - [PATCH v2 1/2] kcsan: selftest: Ensure that address is at least PAGE

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Date:   Thu, 22 Oct 2020 13:45:52 +0200
From:   Marco Elver <elver@...gle.com>
To:     elver@...gle.com, paulmck@...nel.org
Cc:     mark.rutland@....com, dvyukov@...gle.com,
        kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] 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.

Signed-off-by: Marco Elver <elver@...gle.com>
---
v2:
* Introduce patch to series.
---
 kernel/kcsan/selftest.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/kcsan/selftest.c b/kernel/kcsan/selftest.c
index d98bc208d06d..9014a3a82cf9 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;
 
-- 
2.29.0.rc1.297.gfa9743e501-goog