linux-kernel - [PATCH] ftrace: remove KASAN poison in ftrace_ops

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Date:   Sun, 11 Nov 2018 23:10:17 +0800
From:   Zhizhou Zhang <zhizhouzhang@...micro.com>
To:     <rostedt@...dmis.org>, <mingo@...hat.com>
CC:     <linux-kernel@...r.kernel.org>, <zhizhouzhang@...micro.com>,
        <zhizhouzh@...il.com>
Subject: [PATCH] ftrace: remove KASAN poison in ftrace_ops_test()

ftrace_ops_test() passed local varible parameter to hash_contains_ip(),
which could result KASAN stack-out-of-bounds warning.

Signed-off-by: Zhizhou Zhang <zhizhouzhang@...micro.com>
---
 kernel/trace/ftrace.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index f536f60..6e11f90 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1522,6 +1522,8 @@ ftrace_ops_test(struct ftrace_ops *ops, unsigned long ip, void *regs)
 	rcu_assign_pointer(hash.filter_hash, ops->func_hash->filter_hash);
 	rcu_assign_pointer(hash.notrace_hash, ops->func_hash->notrace_hash);
 
+	kasan_unpoison_task_stack(current);
+
 	if (hash_contains_ip(ip, &hash))
 		ret = 1;
 	else
-- 
2.7.4