From: Roy.Li <rongqing.li@windriver.com>
Date: Fri, 20 May 2011 02:38:06 +0000 (+0800)
Subject: SELinux: skip file_name_trans_write() when policy downgraded.
X-Git-Tag: firefly_0821_release~3680^2~5240^2^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=ded509880f6a0213b09f8ae7bef84acb16eaccbf;p=firefly-linux-kernel-4.4.55.git

SELinux: skip file_name_trans_write() when policy downgraded.

When policy version is less than POLICYDB_VERSION_FILENAME_TRANS,
skip file_name_trans_write().

Signed-off-by: Roy.Li <rongqing.li@windriver.com>
Signed-off-by: Eric Paris <eparis@redhat.com>
---

diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c
index 102e9ec1b77a..d246aca3f4fb 100644
--- a/security/selinux/ss/policydb.c
+++ b/security/selinux/ss/policydb.c
@@ -3222,6 +3222,9 @@ static int filename_trans_write(struct policydb *p, void *fp)
 	__le32 buf[1];
 	int rc;
 
+	if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
+		return 0;
+
 	nel = 0;
 	rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
 	if (rc)