linux-kernel - [RFC PATCH 17/22] selinux: reorder policydb

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Message-ID: <20241115133619.114393-17-cgoettsche@seltendoof.de>
Date: Fri, 15 Nov 2024 14:35:36 +0100
From: Christian Göttsche <cgoettsche@...tendoof.de>
To: selinux@...r.kernel.org
Cc: Christian Göttsche <cgzones@...glemail.com>,
	Paul Moore <paul@...l-moore.com>,
	Stephen Smalley <stephen.smalley.work@...il.com>,
	Ondrej Mosnacek <omosnace@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 17/22] selinux: reorder policydb_index()

From: Christian Göttsche <cgzones@...glemail.com>

Index as soon as possible to enable isvalid() checks to fail on gaps.

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

diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index 9b2eae70e2dc..2fe9a68b16f0 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -723,7 +723,6 @@ static int policydb_index(struct policydb *p)
 	pr_debug("SELinux:  %d classes, %d rules\n", p->p_classes.nprim,
 		 p->te_avtab.nel);
 
-	avtab_hash_eval(&p->te_avtab, "rules");
 	symtab_hash_eval(p->symtab);
 
 	p->class_val_to_struct = kcalloc(p->p_classes.nprim,
@@ -2786,6 +2785,10 @@ int policydb_read(struct policydb *p, struct policy_file *fp)
 		p->symtab[i].nprim = nprim;
 	}
 
+	rc = policydb_index(p);
+	if (rc)
+		goto bad;
+
 	rc = -EINVAL;
 	p->process_class = string_to_security_class(p, "process");
 	if (!p->process_class) {
@@ -2797,6 +2800,8 @@ int policydb_read(struct policydb *p, struct policy_file *fp)
 	if (rc)
 		goto bad;
 
+	avtab_hash_eval(&p->te_avtab, "rules");
+
 	if (p->policyvers >= POLICYDB_VERSION_BOOL) {
 		rc = cond_read_list(p, fp);
 		if (rc)
@@ -2893,10 +2898,6 @@ int policydb_read(struct policydb *p, struct policy_file *fp)
 	if (rc)
 		goto bad;
 
-	rc = policydb_index(p);
-	if (rc)
-		goto bad;
-
 	rc = -EINVAL;
 	perm = string_to_av_perm(p, p->process_class, "transition");
 	if (!perm) {
-- 
2.45.2