/* * 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; /* 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); /** * 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 */