linux-kernel - [PATCH 3.16 11/61] selinux: cleanup error reporting in selinux_nlmsg

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Date:   Tue, 09 Jun 2020 19:04:02 +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 11/61] selinux: cleanup error reporting 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 e173fb2646a832b424c80904c306b816760ce477 upstream.

Convert audit_log() call to WARN_ONCE().

Rename "type=" to nlmsg_type=" to avoid confusion with the audit record
type.

Added "protocol=" to help track down which protocol (NETLINK_AUDIT?) was used
within the netlink protocol family.

Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
[Rewrote the patch subject line]
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, 3 insertions(+), 4 deletions(-)

--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4683,10 +4683,9 @@ static int selinux_nlmsg_perm(struct soc
 	err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm);
 	if (err) {
 		if (err == -EINVAL) {
-			audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR,
-				  "SELinux:  unrecognized netlink message"
-				  " type=%hu for sclass=%hu\n",
-				  nlh->nlmsg_type, sksec->sclass);
+			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);
 			if (!selinux_enforcing || security_get_allow_unknown())
 				err = 0;
 		}