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Subject[tip: core/rcu] kcsan: selftest: Ensure that address is at least PAGE_SIZE
The following commit has been merged into the core/rcu branch of tip:

Commit-ID: 4761612ffe3c1655e58f1ef9cf867c6f67d46fe2
Gitweb: https://git.kernel.org/tip/4761612ffe3c1655e58f1ef9cf867c6f67d46fe2
Author: Marco Elver <elver@google.com>
AuthorDate: Thu, 22 Oct 2020 13:45:52 +02:00
Committer: Paul E. McKenney <paulmck@kernel.org>
CommitterDate: Mon, 02 Nov 2020 17:08:50 -08:00

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>
---
kernel/kcsan/selftest.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/kernel/kcsan/selftest.c b/kernel/kcsan/selftest.c
index d98bc20..9014a3a 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;

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