apparmor: move lib definitions into separate lib include

Signed-off-by: John Johansen <john.johansen@canonical.com>

1 files changed, 94 insertions, 0 deletions

diff --git a/security/apparmor/include/lib.h b/security/apparmor/include/lib.h
new file mode 100644
index 000000000000..71fd6d28a651
--- /dev/null
+++ b/security/apparmor/include/lib.h
@@ -0,0 +1,94 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor lib definitions
+ *
+ * 2017 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+
+#ifndef __AA_LIB_H
+#define __AA_LIB_H
+
+#include <linux/slab.h>
+#include <linux/fs.h>
+
+#include "match.h"
+
+/*
+ * DEBUG remains global (no per profile flag) since it is mostly used in sysctl
+ * which is not related to profile accesses.
+ */
+
+#define AA_DEBUG(fmt, args...)						\
+	do {								\
+		if (aa_g_debug)						\
+			pr_debug_ratelimited("AppArmor: " fmt, ##args);	\
+	} while (0)
+
+#define AA_ERROR(fmt, args...)						\
+	pr_err_ratelimited("AppArmor: " fmt, ##args)
+
+/* Flag indicating whether initialization completed */
+extern int apparmor_initialized __initdata;
+
+/* fn's in lib */
+char *aa_split_fqname(char *args, char **ns_name);
+void aa_info_message(const char *str);
+void *__aa_kvmalloc(size_t size, gfp_t flags);
+
+static inline void *kvmalloc(size_t size)
+{
+	return __aa_kvmalloc(size, 0);
+}
+
+static inline void *kvzalloc(size_t size)
+{
+	return __aa_kvmalloc(size, __GFP_ZERO);
+}
+
+/* returns 0 if kref not incremented */
+static inline int kref_get_not0(struct kref *kref)
+{
+	return atomic_inc_not_zero(&kref->refcount);
+}
+
+/**
+ * aa_strneq - compare null terminated @str to a non null terminated substring
+ * @str: a null terminated string
+ * @sub: a substring, not necessarily null terminated
+ * @len: length of @sub to compare
+ *
+ * The @str string must be full consumed for this to be considered a match
+ */
+static inline bool aa_strneq(const char *str, const char *sub, int len)
+{
+	return !strncmp(str, sub, len) && !str[len];
+}
+
+/**
+ * aa_dfa_null_transition - step to next state after null character
+ * @dfa: the dfa to match against
+ * @start: the state of the dfa to start matching in
+ *
+ * aa_dfa_null_transition transitions to the next state after a null
+ * character which is not used in standard matching and is only
+ * used to separate pairs.
+ */
+static inline unsigned int aa_dfa_null_transition(struct aa_dfa *dfa,
+						  unsigned int start)
+{
+	/* the null transition only needs the string's null terminator byte */
+	return aa_dfa_next(dfa, start, 0);
+}
+
+static inline bool mediated_filesystem(struct dentry *dentry)
+{
+	return !(dentry->d_sb->s_flags & MS_NOUSER);
+}
+
+#endif /* AA_LIB_H */