linux-kernel - [PATCH 3.16 12/61] selinux: convert WARN_ONCE() to printk() in selinux_nlmsg

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Date:   Tue, 09 Jun 2020 19:04:03 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Paul Moore" <pmoore@...hat.com>,
        "Richard Guy Briggs" <rgb@...hat.com>
Subject: [PATCH 3.16 12/61] selinux: convert WARN_ONCE() to printk() in
 selinux_nlmsg_perm()

3.16.85-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Guy Briggs <rgb@...hat.com>

commit d950f84c1c6658faec2ecbf5b09f7e7191953394 upstream.

Convert WARN_ONCE() to printk() in selinux_nlmsg_perm().

After conversion from audit_log() in commit e173fb26, WARN_ONCE() was
deemed too alarmist, so switch it to printk().

Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
[PM: Changed to printk(WARNING) so we catch all of the different
 invalid netlink messages.  In Richard's defense, he brought this
 point up earlier, but I didn't understand his point at the time.]
Signed-off-by: Paul Moore <pmoore@...hat.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 security/selinux/hooks.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4683,9 +4683,10 @@ static int selinux_nlmsg_perm(struct soc
 	err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm);
 	if (err) {
 		if (err == -EINVAL) {
-			WARN_ONCE(1, "selinux_nlmsg_perm: unrecognized netlink message:"
-				  " protocol=%hu nlmsg_type=%hu sclass=%hu\n",
-				  sk->sk_protocol, nlh->nlmsg_type, sksec->sclass);
+			printk(KERN_WARNING
+			       "SELinux: unrecognized netlink message:"
+			       " protocol=%hu nlmsg_type=%hu sclass=%hu\n",
+			       sk->sk_protocol, nlh->nlmsg_type, sksec->sclass);
 			if (!selinux_enforcing || security_get_allow_unknown())
 				err = 0;
 		}