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-rw-r--r--security/selinux/ss/symtab.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/security/selinux/ss/symtab.c b/security/selinux/ss/symtab.c
new file mode 100644
index 0000000000..43d7f0319c
--- /dev/null
+++ b/security/selinux/ss/symtab.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Implementation of the symbol table type.
+ *
+ * Author : Stephen Smalley, <stephen.smalley.work@gmail.com>
+ */
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include "symtab.h"
+
+static unsigned int symhash(const void *key)
+{
+ const char *p, *keyp;
+ unsigned int size;
+ unsigned int val;
+
+ val = 0;
+ keyp = key;
+ size = strlen(keyp);
+ for (p = keyp; (p - keyp) < size; p++)
+ val = (val << 4 | (val >> (8*sizeof(unsigned int)-4))) ^ (*p);
+ return val;
+}
+
+static int symcmp(const void *key1, const void *key2)
+{
+ const char *keyp1, *keyp2;
+
+ keyp1 = key1;
+ keyp2 = key2;
+ return strcmp(keyp1, keyp2);
+}
+
+static const struct hashtab_key_params symtab_key_params = {
+ .hash = symhash,
+ .cmp = symcmp,
+};
+
+int symtab_init(struct symtab *s, u32 size)
+{
+ s->nprim = 0;
+ return hashtab_init(&s->table, size);
+}
+
+int symtab_insert(struct symtab *s, char *name, void *datum)
+{
+ return hashtab_insert(&s->table, name, datum, symtab_key_params);
+}
+
+void *symtab_search(struct symtab *s, const char *name)
+{
+ return hashtab_search(&s->table, name, symtab_key_params);
+}