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From: Amol Grover <frextrite@gmail.com>
To: Paul Moore <paul@paul-moore.com>, Eric Paris <eparis@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-audit@redhat.com,
	Joel Fernandes <joel@joelfernandes.org>,
	linux-kernel-mentees@lists.linuxfoundation.org
Subject: [Linux-kernel-mentees] [PATCH v3] kernel: audit.c: Add __rcu annotation to RCU pointer
Date: Mon,  2 Dec 2019 00:03:48 +0530
Message-ID: <20191201183347.18122-1-frextrite@gmail.com> (raw)

Add __rcu annotation to RCU-protected global pointer auditd_conn.

auditd_conn is an RCU-protected global pointer,i.e., accessed
via RCU methods rcu_dereference() and rcu_assign_pointer(),
hence it must be annotated with __rcu for sparse to report
warnings/errors correctly.

Fix multiple instances of the sparse error:
error: incompatible types in comparison expression
(different address spaces)

Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Amol Grover <frextrite@gmail.com>
---
v3:
- update changelog to be more descriptive

v2:
- fix erroneous RCU pointer initialization
 
 kernel/audit.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index da8dc0db5bd3..ff7cfc61f53d 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -102,12 +102,13 @@ struct audit_net {
  * This struct is RCU protected; you must either hold the RCU lock for reading
  * or the associated spinlock for writing.
  */
-static struct auditd_connection {
+struct auditd_connection {
 	struct pid *pid;
 	u32 portid;
 	struct net *net;
 	struct rcu_head rcu;
-} *auditd_conn = NULL;
+};
+static struct auditd_connection __rcu *auditd_conn;
 static DEFINE_SPINLOCK(auditd_conn_lock);
 
 /* If audit_rate_limit is non-zero, limit the rate of sending audit records
-- 
2.24.0

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             reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-01 18:33 Amol Grover [this message]
2019-12-02 21:19 ` Joel Fernandes
2019-12-02 22:26   ` Steven Rostedt
2019-12-02 23:34     ` Joel Fernandes
2019-12-02 23:24   ` Paul Moore
2019-12-02 23:34     ` Joel Fernandes
2019-12-09 20:31       ` Paul Moore

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