1 files changed, 194 insertions, 0 deletions
diff --git a/security/apparmor/include/lib.h b/security/apparmor/include/lib.h
new file mode 100644
index 000000000000..65ff492a9807
--- /dev/null
+++ b/security/apparmor/include/lib.h
@@ -0,0 +1,194 @@
+/*
+ * 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"
+
+/* Provide our own test for whether a write lock is held for asserts
+ * this is because on none SMP systems write_can_lock will always
+ * resolve to true, which is what you want for code making decisions
+ * based on it, but wrong for asserts checking that the lock is held
+ */
+#ifdef CONFIG_SMP
+#define write_is_locked(X) !write_can_lock(X)
+#else
+#define write_is_locked(X) (1)
+#endif /* CONFIG_SMP */
+
+/*
+ * DEBUG remains global (no per profile flag) since it is mostly used in sysctl
+ * which is not related to profile accesses.
+ */
+
+#define DEBUG_ON (aa_g_debug)
+#define dbg_printk(__fmt, __args...) pr_debug(__fmt, ##__args)
+#define AA_DEBUG(fmt, args...)						\
+	do {								\
+		if (DEBUG_ON)						\
+			pr_debug_ratelimited("AppArmor: " fmt, ##args);	\
+	} while (0)
+
+#define AA_WARN(X) WARN((X), "APPARMOR WARN %s: %s\n", __func__, #X)
+
+#define AA_BUG(X, args...) AA_BUG_FMT((X), "" args)
+#ifdef CONFIG_SECURITY_APPARMOR_DEBUG_ASSERTS
+#define AA_BUG_FMT(X, fmt, args...)					\
+	WARN((X), "AppArmor WARN %s: (" #X "): " fmt, __func__, ##args)
+#else
+#define AA_BUG_FMT(X, fmt, args...)
+#endif
+
+#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);
+const char *aa_splitn_fqname(const char *fqname, size_t n, const char **ns_name,
+			     size_t *ns_len);
+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);
+}
+
+/**
+ * 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 path_mediated_fs(struct dentry *dentry)
+{
+	return !(dentry->d_sb->s_flags & MS_NOUSER);
+}
+
+/* struct aa_policy - common part of both namespaces and profiles
+ * @name: name of the object
+ * @hname - The hierarchical name
+ * @list: list policy object is on
+ * @profiles: head of the profiles list contained in the object
+ */
+struct aa_policy {
+	const char *name;
+	const char *hname;
+	struct list_head list;
+	struct list_head profiles;
+};
+
+/**
+ * basename - find the last component of an hname
+ * @name: hname to find the base profile name component of  (NOT NULL)
+ *
+ * Returns: the tail (base profile name) name component of an hname
+ */
+static inline const char *basename(const char *hname)
+{
+	char *split;
+
+	hname = strim((char *)hname);
+	for (split = strstr(hname, "//"); split; split = strstr(hname, "//"))
+		hname = split + 2;
+
+	return hname;
+}
+
+/**
+ * __policy_find - find a policy by @name on a policy list
+ * @head: list to search  (NOT NULL)
+ * @name: name to search for  (NOT NULL)
+ *
+ * Requires: rcu_read_lock be held
+ *
+ * Returns: unrefcounted policy that match @name or NULL if not found
+ */
+static inline struct aa_policy *__policy_find(struct list_head *head,
+					      const char *name)
+{
+	struct aa_policy *policy;
+
+	list_for_each_entry_rcu(policy, head, list) {
+		if (!strcmp(policy->name, name))
+			return policy;
+	}
+	return NULL;
+}
+
+/**
+ * __policy_strn_find - find a policy that's name matches @len chars of @str
+ * @head: list to search  (NOT NULL)
+ * @str: string to search for  (NOT NULL)
+ * @len: length of match required
+ *
+ * Requires: rcu_read_lock be held
+ *
+ * Returns: unrefcounted policy that match @str or NULL if not found
+ *
+ * if @len == strlen(@strlen) then this is equiv to __policy_find
+ * other wise it allows searching for policy by a partial match of name
+ */
+static inline struct aa_policy *__policy_strn_find(struct list_head *head,
+					    const char *str, int len)
+{
+	struct aa_policy *policy;
+
+	list_for_each_entry_rcu(policy, head, list) {
+		if (aa_strneq(policy->name, str, len))
+			return policy;
+	}
+
+	return NULL;
+}
+
+bool aa_policy_init(struct aa_policy *policy, const char *prefix,
+		    const char *name, gfp_t gfp);
+void aa_policy_destroy(struct aa_policy *policy);
+
+#endif /* AA_LIB_H */