linux-kernel - Re: [PATCH 01/13] selinux: Cleanup printk logging in conditional

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Date:   Tue, 12 Jun 2018 07:38:00 -0700
From:   Joe Perches <joe@...ches.com>
To:     Peter Enderborg <peter.enderborg@...y.com>,
        Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Eric Paris <eparis@...isplace.org>,
        James Morris <jmorris@...ei.org>,
        Daniel Jurgens <danielj@...lanox.com>,
        Doug Ledford <dledford@...hat.com>, selinux@...ho.nsa.gov,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, "Serge E . Hallyn" <serge@...lyn.com>
Subject: Re: [PATCH 01/13] selinux: Cleanup printk logging in conditional

On Tue, 2018-06-12 at 10:09 +0200, Peter Enderborg wrote:
> Replace printk with pr_* to avoid checkpatch warnings.

I believe it would be nicer to remove the
"SELinux: " prefix embbeded in each format
and use a specific

#define pr_fmt(fmt) "SELinux: " fmt

to automatically prefix these formats.

> diff --git a/security/selinux/ss/conditional.c b/security/selinux/ss/conditional.c
[]
> @@ -96,7 +96,7 @@ int evaluate_cond_node(struct policydb *p, struct cond_node *node)
>  	if (new_state != node->cur_state) {
>  		node->cur_state = new_state;
>  		if (new_state == -1)
> -			printk(KERN_ERR "SELinux: expression result was undefined - disabling all rules.\n");
> +			pr_err("SELinux: expression result was undefined - disabling all rules.\n");
>  		/* turn the rules on or off */
>  		for (cur = node->true_list; cur; cur = cur->next) {
>  			if (new_state <= 0)

So, for instance, this patch could become:
(etc and so forth for each patch in this series)

---
 security/selinux/ss/conditional.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/security/selinux/ss/conditional.c b/security/selinux/ss/conditional.c
index c91543a617ac..e96820d92b61 100644
--- a/security/selinux/ss/conditional.c
+++ b/security/selinux/ss/conditional.c
@@ -7,6 +7,8 @@
  *	the Free Software Foundation, version 2.
  */
 
+#define pr_fmt(fmt) "SELinux: " fmt
+
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/string.h>
@@ -96,7 +98,7 @@ int evaluate_cond_node(struct policydb *p, struct cond_node *node)
 	if (new_state != node->cur_state) {
 		node->cur_state = new_state;
 		if (new_state == -1)
-			printk(KERN_ERR "SELinux: expression result was undefined - disabling all rules.\n");
+			pr_err("expression result was undefined - disabling all rules\n");
 		/* turn the rules on or off */
 		for (cur = node->true_list; cur; cur = cur->next) {
 			if (new_state <= 0)
@@ -287,7 +289,7 @@ static int cond_insertf(struct avtab *a, struct avtab_key *k, struct avtab_datum
 	 */
 	if (k->specified & AVTAB_TYPE) {
 		if (avtab_search(&p->te_avtab, k)) {
-			printk(KERN_ERR "SELinux: type rule already exists outside of a conditional.\n");
+			pr_err("type rule already exists outside of a conditional\n");
 			goto err;
 		}
 		/*
@@ -302,7 +304,7 @@ static int cond_insertf(struct avtab *a, struct avtab_key *k, struct avtab_datum
 			node_ptr = avtab_search_node(&p->te_cond_avtab, k);
 			if (node_ptr) {
 				if (avtab_search_node_next(node_ptr, k->specified)) {
-					printk(KERN_ERR "SELinux: too many conflicting type rules.\n");
+					pr_err("too many conflicting type rules\n");
 					goto err;
 				}
 				found = 0;
@@ -313,13 +315,13 @@ static int cond_insertf(struct avtab *a, struct avtab_key *k, struct avtab_datum
 					}
 				}
 				if (!found) {
-					printk(KERN_ERR "SELinux: conflicting type rules.\n");
+					pr_err("conflicting type rules\n");
 					goto err;
 				}
 			}
 		} else {
 			if (avtab_search(&p->te_cond_avtab, k)) {
-				printk(KERN_ERR "SELinux: conflicting type rules when adding type rule for true.\n");
+				pr_err("conflicting type rules when adding type rule for true\n");
 				goto err;
 			}
 		}
@@ -327,7 +329,7 @@ static int cond_insertf(struct avtab *a, struct avtab_key *k, struct avtab_datum
 
 	node_ptr = avtab_insert_nonunique(&p->te_cond_avtab, k, d);
 	if (!node_ptr) {
-		printk(KERN_ERR "SELinux: could not insert rule.\n");
+		pr_err("could not insert rule\n");
 		rc = -ENOMEM;
 		goto err;
 	}
@@ -387,12 +389,12 @@ static int cond_read_av_list(struct policydb *p, void *fp, struct cond_av_list *
 static int expr_isvalid(struct policydb *p, struct cond_expr *expr)
 {
 	if (expr->expr_type <= 0 || expr->expr_type > COND_LAST) {
-		printk(KERN_ERR "SELinux: conditional expressions uses unknown operator.\n");
+		pr_err("conditional expressions uses unknown operator\n");
 		return 0;
 	}
 
 	if (expr->bool > p->p_bools.nprim) {
-		printk(KERN_ERR "SELinux: conditional expressions uses unknown bool.\n");
+		pr_err("conditional expressions uses unknown bool\n");
 		return 0;
 	}
 	return 1;