SELinux: ensure keys constant in hashtab_search

Makes the key argument passed into hashtab_search and all the functions
it calls constant. These functions include hash table function pointers
hash_value and keycmp. The only implementations of these currently
are symhash and symcmp, which do not modify the key. The key parameter
should never be changed by any of these, so it should be const. This
is necessary to allow calling these functions with keys found in kernel
object class and permission definitions.

Signed-off-by: Chad Sellers <csellers@tresys.com>
Acked-by:  Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/security/selinux/ss/symtab.c b/security/selinux/ss/symtab.c
index 24a10d36d3b6..837658a98a54 100644
--- a/security/selinux/ss/symtab.c
+++ b/security/selinux/ss/symtab.c
@@ -9,9 +9,9 @@
 #include <linux/errno.h>
 #include "symtab.h"
 
-static unsigned int symhash(struct hashtab *h, void *key)
+static unsigned int symhash(struct hashtab *h, const void *key)
 {
-	char *p, *keyp;
+	const char *p, *keyp;
 	unsigned int size;
 	unsigned int val;
 
@@ -23,9 +23,9 @@ static unsigned int symhash(struct hashtab *h, void *key)
 	return val & (h->size - 1);
 }
 
-static int symcmp(struct hashtab *h, void *key1, void *key2)
+static int symcmp(struct hashtab *h, const void *key1, const void *key2)
 {
-	char *keyp1, *keyp2;
+	const char *keyp1, *keyp2;
 
 	keyp1 = key1;
 	keyp2 = key2;