linux-kernel - [RFC PATCH 06/20] selinux: mls: avoid implicit conversions

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Message-Id: <20230706132337.15924-6-cgzones@googlemail.com>
Date:   Thu,  6 Jul 2023 15:23:21 +0200
From:   Christian Göttsche <cgzones@...glemail.com>
To:     selinux@...r.kernel.org
Cc:     Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Eric Paris <eparis@...isplace.org>,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH 06/20] selinux: mls: avoid implicit conversions

Use u32 for ebitmap bits.

Use char for the default range of a class.

Signed-off-by: Christian Göttsche <cgzones@...glemail.com>
---
 security/selinux/ss/mls.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/security/selinux/ss/mls.c b/security/selinux/ss/mls.c
index 99571b19d4a9..1976f6b857e9 100644
--- a/security/selinux/ss/mls.c
+++ b/security/selinux/ss/mls.c
@@ -45,7 +45,7 @@ int mls_compute_context_len(struct policydb *p, struct context *context)
 
 	len = 1; /* for the beginning ":" */
 	for (l = 0; l < 2; l++) {
-		int index_sens = context->range.level[l].sens;
+		u32 index_sens = context->range.level[l].sens;
 		len += strlen(sym_name(p, SYM_LEVELS, index_sens - 1));
 
 		/* categories */
@@ -240,7 +240,7 @@ int mls_context_to_sid(struct policydb *pol,
 	char *sensitivity, *cur_cat, *next_cat, *rngptr;
 	struct level_datum *levdatum;
 	struct cat_datum *catdatum, *rngdatum;
-	int l, rc, i;
+	int l, rc;
 	char *rangep[2];
 
 	if (!pol->mls_enabled) {
@@ -331,7 +331,7 @@ int mls_context_to_sid(struct policydb *pol,
 			if (catdatum->value >= rngdatum->value)
 				return -EINVAL;
 
-			for (i = catdatum->value; i < rngdatum->value; i++) {
+			for (u32 i = catdatum->value; i < rngdatum->value; i++) {
 				rc = ebitmap_set_bit(&context->range.level[l].cat, i, 1);
 				if (rc)
 					return rc;
@@ -451,7 +451,8 @@ int mls_convert_context(struct policydb *oldp,
 	struct level_datum *levdatum;
 	struct cat_datum *catdatum;
 	struct ebitmap_node *node;
-	int l, i;
+	u32 i;
+	int l;
 
 	if (!oldp->mls_enabled || !newp->mls_enabled)
 		return 0;
@@ -495,7 +496,7 @@ int mls_compute_sid(struct policydb *p,
 	struct range_trans rtr;
 	struct mls_range *r;
 	struct class_datum *cladatum;
-	int default_range = 0;
+	char default_range = 0;
 
 	if (!p->mls_enabled)
 		return 0;
-- 
2.40.1