Merge tag 'apparmor-pr-2020-06-07' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor

Pull apparmor updates from John Johansen:
"Features:
- Replace zero-length array with flexible-array
- add a valid state flags check
- add consistency check between state and dfa diff encode flags
- add apparmor subdir to proc attr interface
- fail unpack if profile mode is unknown
- add outofband transition and use it in xattr match
- ensure that dfa state tables have entries

Cleanups:
- Use true and false for bool variable
- Remove semicolon
- Clean code by removing redundant instructions
- Replace two seq_printf() calls by seq_puts() in aa_label_seq_xprint()
- remove duplicate check of xattrs on profile attachment
- remove useless aafs_create_symlink

Bug fixes:
- Fix memory leak of profile proxy
- fix introspection of of task mode for unconfined tasks
- fix nnp subset test for unconfined
- check/put label on apparmor_sk_clone_security()"

* tag 'apparmor-pr-2020-06-07' of git://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor:
apparmor: Fix memory leak of profile proxy
apparmor: fix introspection of of task mode for unconfined tasks
apparmor: check/put label on apparmor_sk_clone_security()
apparmor: Use true and false for bool variable
security/apparmor/label.c: Clean code by removing redundant instructions
apparmor: Replace zero-length array with flexible-array
apparmor: ensure that dfa state tables have entries
apparmor: remove duplicate check of xattrs on profile attachment.
apparmor: add outofband transition and use it in xattr match
apparmor: fail unpack if profile mode is unknown
apparmor: fix nnp subset test for unconfined
apparmor: remove useless aafs_create_symlink
apparmor: add proc subdir to attrs
apparmor: add consistency check between state and dfa diff encode flags
apparmor: add a valid state flags check
AppArmor: Remove semicolon
apparmor: Replace two seq_printf() calls by seq_puts() in aa_label_seq_xprint()

fs/proc/base.c

···
 LSM_DIR_OPS(smack);
 #endif
 
+#ifdef CONFIG_SECURITY_APPARMOR
+static const struct pid_entry apparmor_attr_dir_stuff[] = {
+	ATTR("apparmor", "current",	0666),
+	ATTR("apparmor", "prev",	0444),
+	ATTR("apparmor", "exec",	0666),
+};
+LSM_DIR_OPS(apparmor);
+#endif
+
 static const struct pid_entry attr_dir_stuff[] = {
 	ATTR(NULL, "current",		0666),
 	ATTR(NULL, "prev",		0444),
···
 #ifdef CONFIG_SECURITY_SMACK
 	DIR("smack",			0555,
 	    proc_smack_attr_dir_inode_ops, proc_smack_attr_dir_ops),
+#endif
+#ifdef CONFIG_SECURITY_APPARMOR
+	DIR("apparmor",			0555,
+	    proc_apparmor_attr_dir_inode_ops, proc_apparmor_attr_dir_ops),
 #endif
 };
 

security/apparmor/apparmorfs.c

···
 }
 
 /**
- * aafs_create_symlink - create a symlink in the apparmorfs filesystem
- * @name: name of dentry to create
- * @parent: parent directory for this dentry
- * @target: if symlink, symlink target string
- * @private: private data
- * @iops: struct of inode_operations that should be used
- *
- * If @target parameter is %NULL, then the @iops parameter needs to be
- * setup to handle .readlink and .get_link inode_operations.
- */
-static struct dentry *aafs_create_symlink(const char *name,
-					  struct dentry *parent,
-					  const char *target,
-					  void *private,
-					  const struct inode_operations *iops)
-{
-	struct dentry *dent;
-	char *link = NULL;
-
-	if (target) {
-		if (!link)
-			return ERR_PTR(-ENOMEM);
-	}
-	dent = aafs_create(name, S_IFLNK | 0444, parent, private, link, NULL,
-			   iops);
-	if (IS_ERR(dent))
-		kfree(link);
-
-	return dent;
-}
-
-/**
  * aafs_remove - removes a file or directory from the apparmorfs filesystem
  *
  * @dentry: dentry of the file/directory/symlink to removed.
···
 
 void __aa_bump_ns_revision(struct aa_ns *ns)
 {
-	WRITE_ONCE(ns->revision, ns->revision + 1);
+	WRITE_ONCE(ns->revision, READ_ONCE(ns->revision) + 1);
 	wake_up_interruptible(&ns->wait);
 }
 
···
 struct multi_transaction {
 	struct kref count;
 	ssize_t size;
-	char data[0];
+	char data[];
 };
 
 #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction))
···
 	}
 
 	if (profile->rawdata) {
-		dent = aafs_create_symlink("raw_sha1", dir, NULL,
-					   profile->label.proxy,
-					   &rawdata_link_sha1_iops);
+		dent = aafs_create("raw_sha1", S_IFLNK | 0444, dir,
+				   profile->label.proxy, NULL, NULL,
+				   &rawdata_link_sha1_iops);
 		if (IS_ERR(dent))
 			goto fail;
 		aa_get_proxy(profile->label.proxy);
 		profile->dents[AAFS_PROF_RAW_HASH] = dent;
 
-		dent = aafs_create_symlink("raw_abi", dir, NULL,
-					   profile->label.proxy,
-					   &rawdata_link_abi_iops);
+		dent = aafs_create("raw_abi", S_IFLNK | 0444, dir,
+				   profile->label.proxy, NULL, NULL,
+				   &rawdata_link_abi_iops);
 		if (IS_ERR(dent))
 			goto fail;
 		aa_get_proxy(profile->label.proxy);
 		profile->dents[AAFS_PROF_RAW_ABI] = dent;
 
-		dent = aafs_create_symlink("raw_data", dir, NULL,
-					   profile->label.proxy,
-					   &rawdata_link_data_iops);
+		dent = aafs_create("raw_data", S_IFLNK | 0444, dir,
+				   profile->label.proxy, NULL, NULL,
+				   &rawdata_link_data_iops);
 		if (IS_ERR(dent))
 			goto fail;
 		aa_get_proxy(profile->label.proxy);
···
 static struct aa_sfs_entry aa_sfs_entry_policy[] = {
 	AA_SFS_DIR("versions",			aa_sfs_entry_versions),
 	AA_SFS_FILE_BOOLEAN("set_load",		1),
+	/* number of out of band transitions supported */
+	AA_SFS_FILE_U64("outofband",		MAX_OOB_SUPPORTED),
 	{ }
 };
 

security/apparmor/domain.c

···
 	might_sleep();
 
 	/* transition from exec match to xattr set */
-	state = aa_dfa_null_transition(profile->xmatch, state);
-
+	state = aa_dfa_outofband_transition(profile->xmatch, state);
 	d = bprm->file->f_path.dentry;
 
 	for (i = 0; i < profile->xattr_count; i++) {
···
 		if (size >= 0) {
 			u32 perm;
 
-			/* Check the xattr value, not just presence */
+			/*
+			 * Check the xattr presence before value. This ensure
+			 * that not present xattr can be distinguished from a 0
+			 * length value or rule that matches any value
+			 */
+			state = aa_dfa_null_transition(profile->xmatch, state);
+			/* Check xattr value */
 			state = aa_dfa_match_len(profile->xmatch, state, value,
 						 size);
 			perm = dfa_user_allow(profile->xmatch, state);
···
 			}
 		}
 		/* transition to next element */
-		state = aa_dfa_null_transition(profile->xmatch, state);
+		state = aa_dfa_outofband_transition(profile->xmatch, state);
 		if (size < 0) {
 			/*
 			 * No xattr match, so verify if transition to
···
 					   bool *secure_exec)
 {
 	struct aa_label *new = NULL;
-	struct aa_profile *component;
-	struct label_it i;
 	const char *info = NULL, *name = NULL, *target = NULL;
 	unsigned int state = profile->file.start;
 	struct aa_perms perms = {};
···
 			info = "profile transition not found";
 			/* remove MAY_EXEC to audit as failure */
 			perms.allow &= ~MAY_EXEC;
-		} else {
-			/* verify that each component's xattr requirements are
-			 * met, and fail execution otherwise
-			 */
-			label_for_each(i, new, component) {
-				if (aa_xattrs_match(bprm, component, state) <
-				    0) {
-					error = -EACCES;
-					info = "required xattrs not present";
-					perms.allow &= ~MAY_EXEC;
-					aa_put_label(new);
-					new = NULL;
-					goto audit;
-				}
-			}
 		}
 	} else if (COMPLAIN_MODE(profile)) {
 		/* no exec permission - learning mode */
···
 	 * aways results in a further reduction of permissions.
 	 */
 	if ((bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS) &&
-	    !unconfined(label) && !aa_label_is_subset(new, ctx->nnp)) {
+	    !unconfined(label) &&
+	    !aa_label_is_unconfined_subset(new, ctx->nnp)) {
 		error = -EPERM;
 		info = "no new privs";
 		goto audit;
···
 		 * reduce restrictions.
 		 */
 		if (task_no_new_privs(current) && !unconfined(label) &&
-		    !aa_label_is_subset(new, ctx->nnp)) {
+		    !aa_label_is_unconfined_subset(new, ctx->nnp)) {
 			/* not an apparmor denial per se, so don't log it */
 			AA_DEBUG("no_new_privs - change_hat denied");
 			error = -EPERM;
···
 		 * reduce restrictions.
 		 */
 		if (task_no_new_privs(current) && !unconfined(label) &&
-		    !aa_label_is_subset(previous, ctx->nnp)) {
+		    !aa_label_is_unconfined_subset(previous, ctx->nnp)) {
 			/* not an apparmor denial per se, so don't log it */
 			AA_DEBUG("no_new_privs - change_hat denied");
 			error = -EPERM;
···
 		 * reduce restrictions.
 		 */
 		if (task_no_new_privs(current) && !unconfined(label) &&
-		    !aa_label_is_subset(new, ctx->nnp)) {
+		    !aa_label_is_unconfined_subset(new, ctx->nnp)) {
 			/* not an apparmor denial per se, so don't log it */
 			AA_DEBUG("no_new_privs - change_hat denied");
 			error = -EPERM;

security/apparmor/file.c

···
  * is_deleted - test if a file has been completely unlinked
  * @dentry: dentry of file to test for deletion  (NOT NULL)
  *
- * Returns: %1 if deleted else %0
+ * Returns: true if deleted else false
  */
 static inline bool is_deleted(struct dentry *dentry)
 {
 	if (d_unlinked(dentry) && d_backing_inode(dentry)->i_nlink == 0)
-		return 1;
-	return 0;
+		return true;
+	return false;
 }
 
 static int path_name(const char *op, struct aa_label *label,
···
  * this is done as part of the subset test, where a hardlink must have
  * a subset of permissions that the target has.
  *
- * Returns: %1 if subset else %0
+ * Returns: true if subset else false
  */
 static inline bool xindex_is_subset(u32 link, u32 target)
 {
 	if (((link & ~AA_X_UNSAFE) != (target & ~AA_X_UNSAFE)) ||
 	    ((link & AA_X_UNSAFE) && !(target & AA_X_UNSAFE)))
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
 static int profile_path_link(struct aa_profile *profile,

security/apparmor/include/label.h

···
 void aa_labelset_init(struct aa_labelset *ls);
 void __aa_labelset_update_subtree(struct aa_ns *ns);
 
+void aa_label_destroy(struct aa_label *label);
 void aa_label_free(struct aa_label *label);
 void aa_label_kref(struct kref *kref);
 bool aa_label_init(struct aa_label *label, int size, gfp_t gfp);
 struct aa_label *aa_label_alloc(int size, struct aa_proxy *proxy, gfp_t gfp);
 
 bool aa_label_is_subset(struct aa_label *set, struct aa_label *sub);
+bool aa_label_is_unconfined_subset(struct aa_label *set, struct aa_label *sub);
 struct aa_profile *__aa_label_next_not_in_set(struct label_it *I,
 					     struct aa_label *set,
 					     struct aa_label *sub);

security/apparmor/include/match.h

···
 
 #define YYTH_MAGIC	0x1B5E783D
 #define YYTH_FLAG_DIFF_ENCODE	1
+#define YYTH_FLAG_OOB_TRANS	2
+#define YYTH_FLAGS (YYTH_FLAG_DIFF_ENCODE | YYTH_FLAG_OOB_TRANS)
+
+#define MAX_OOB_SUPPORTED	1
 
 struct table_set_header {
 	u32 th_magic;		/* YYTH_MAGIC */
···
 struct aa_dfa {
 	struct kref count;
 	u16 flags;
+	u32 max_oob;
 	struct table_header *tables[YYTD_ID_TSIZE];
 };
 
···
 			  const char *str);
 unsigned int aa_dfa_next(struct aa_dfa *dfa, unsigned int state,
 			 const char c);
+unsigned int aa_dfa_outofband_transition(struct aa_dfa *dfa,
+					 unsigned int state);
 unsigned int aa_dfa_match_until(struct aa_dfa *dfa, unsigned int start,
 				const char *str, const char **retpos);
 unsigned int aa_dfa_matchn_until(struct aa_dfa *dfa, unsigned int start,
···
 
 #define MATCH_FLAG_DIFF_ENCODE 0x80000000
 #define MARK_DIFF_ENCODE 0x40000000
+#define MATCH_FLAG_OOB_TRANSITION 0x20000000
+#define MATCH_FLAGS_MASK 0xff000000
+#define MATCH_FLAGS_VALID (MATCH_FLAG_DIFF_ENCODE | MATCH_FLAG_OOB_TRANSITION)
+#define MATCH_FLAGS_INVALID (MATCH_FLAGS_MASK & ~MATCH_FLAGS_VALID)
 
 #endif /* __AA_MATCH_H */

security/apparmor/label.c

···
 }
 
 
-static void label_destroy(struct aa_label *label)
+void aa_label_destroy(struct aa_label *label)
 {
-	struct aa_label *tmp;
-
 	AA_BUG(!label);
 
 	if (!label_isprofile(label)) {
···
 		}
 	}
 
-	if (rcu_dereference_protected(label->proxy->label, true) == label)
-		rcu_assign_pointer(label->proxy->label, NULL);
-
+	if (label->proxy) {
+		if (rcu_dereference_protected(label->proxy->label, true) == label)
+			rcu_assign_pointer(label->proxy->label, NULL);
+		aa_put_proxy(label->proxy);
+	}
 	aa_free_secid(label->secid);
 
-	tmp = rcu_dereference_protected(label->proxy->label, true);
-	if (tmp == label)
-		rcu_assign_pointer(label->proxy->label, NULL);
-
-	aa_put_proxy(label->proxy);
 	label->proxy = (struct aa_proxy *) PROXY_POISON + 1;
 }
 
···
 	if (!label)
 		return;
 
-	label_destroy(label);
+	aa_label_destroy(label);
 	kfree(label);
 }
 
···
 	return __aa_label_next_not_in_set(&i, set, sub) == NULL;
 }
 
+/**
+ * aa_label_is_unconfined_subset - test if @sub is a subset of @set
+ * @set: label to test against
+ * @sub: label to test if is subset of @set
+ *
+ * This checks for subset but taking into account unconfined. IF
+ * @sub contains an unconfined profile that does not have a matching
+ * unconfined in @set then this will not cause the test to fail.
+ * Conversely we don't care about an unconfined in @set that is not in
+ * @sub
+ *
+ * Returns: true if @sub is special_subset of @set
+ *     else false
+ */
+bool aa_label_is_unconfined_subset(struct aa_label *set, struct aa_label *sub)
+{
+	struct label_it i = { };
+	struct aa_profile *p;
+
+	AA_BUG(!set);
+	AA_BUG(!sub);
+
+	if (sub == set)
+		return true;
+
+	do {
+		p = __aa_label_next_not_in_set(&i, set, sub);
+		if (p && !profile_unconfined(p))
+			break;
+	} while (p);
+
+	return p == NULL;
+}
 
 
 /**
···
 
 	label_for_each(i, label, profile) {
 		if (aa_ns_visible(ns, profile->ns, flags & FLAG_VIEW_SUBNS)) {
-			if (profile->mode == APPARMOR_UNCONFINED)
+			count++;
+			if (profile == profile->ns->unconfined)
 				/* special case unconfined so stacks with
 				 * unconfined don't report as mixed. ie.
 				 * profile_foo//&:ns1:unconfined (mixed)
 				 */
 				continue;
-			count++;
 			if (mode == -1)
 				mode = profile->mode;
 			else if (mode != profile->mode)
···
 			AA_DEBUG("label print error");
 			return;
 		}
-		seq_printf(f, "%s", str);
+		seq_puts(f, str);
 		kfree(str);
 	} else if (display_mode(ns, label, flags))
 		seq_printf(f, "%s (%s)", label->hname,
 			   label_modename(ns, label, flags));
 	else
-		seq_printf(f, "%s", label->hname);
+		seq_puts(f, label->hname);
 }
 
 void aa_label_xprintk(struct aa_ns *ns, struct aa_label *label, int flags,

security/apparmor/lsm.c

···
 	struct aa_sk_ctx *ctx = SK_CTX(sk);
 	struct aa_sk_ctx *new = SK_CTX(newsk);
 
+	if (new->label)
+		aa_put_label(new->label);
 	new->label = aa_get_label(ctx->label);
+
+	if (new->peer)
+		aa_put_label(new->peer);
 	new->peer = aa_get_label(ctx->peer);
 }
 

security/apparmor/match.c

···
 	      th.td_flags == YYTD_DATA8))
 		goto out;
 
+	/* if we have a table it must have some entries */
+	if (th.td_lolen == 0)
+		goto out;
 	tsize = table_size(th.td_lolen, th.td_flags);
 	if (bsize < tsize)
 		goto out;
···
 
 	state_count = dfa->tables[YYTD_ID_BASE]->td_lolen;
 	trans_count = dfa->tables[YYTD_ID_NXT]->td_lolen;
+	if (state_count == 0)
+		goto out;
 	for (i = 0; i < state_count; i++) {
 		if (!(BASE_TABLE(dfa)[i] & MATCH_FLAG_DIFF_ENCODE) &&
 		    (DEFAULT_TABLE(dfa)[i] >= state_count))
 			goto out;
+		if (BASE_TABLE(dfa)[i] & MATCH_FLAGS_INVALID) {
+			pr_err("AppArmor DFA state with invalid match flags");
+			goto out;
+		}
+		if ((BASE_TABLE(dfa)[i] & MATCH_FLAG_DIFF_ENCODE)) {
+			if (!(dfa->flags & YYTH_FLAG_DIFF_ENCODE)) {
+				pr_err("AppArmor DFA diff encoded transition state without header flag");
+				goto out;
+			}
+		}
+		if ((BASE_TABLE(dfa)[i] & MATCH_FLAG_OOB_TRANSITION)) {
+			if (base_idx(BASE_TABLE(dfa)[i]) < dfa->max_oob) {
+				pr_err("AppArmor DFA out of bad transition out of range");
+				goto out;
+			}
+			if (!(dfa->flags & YYTH_FLAG_OOB_TRANS)) {
+				pr_err("AppArmor DFA out of bad transition state without header flag");
+				goto out;
+			}
+		}
 		if (base_idx(BASE_TABLE(dfa)[i]) + 255 >= trans_count) {
 			pr_err("AppArmor DFA next/check upper bounds error\n");
 			goto out;
···
 		goto fail;
 
 	dfa->flags = ntohs(*(__be16 *) (data + 12));
-	if (dfa->flags != 0 && dfa->flags != YYTH_FLAG_DIFF_ENCODE)
+	if (dfa->flags & ~(YYTH_FLAGS))
 		goto fail;
+
+	/*
+	 * TODO: needed for dfa to support more than 1 oob
+	 * if (dfa->flags & YYTH_FLAGS_OOB_TRANS) {
+	 *	if (hsize < 16 + 4)
+	 *		goto fail;
+	 *	dfa->max_oob = ntol(*(__be32 *) (data + 16));
+	 *	if (dfa->max <= MAX_OOB_SUPPORTED) {
+	 *		pr_err("AppArmor DFA OOB greater than supported\n");
+	 *		goto fail;
+	 *	}
+	 * }
+	 */
+	dfa->max_oob = 1;
 
 	data += hsize;
 	size -= hsize;
···
 		match_char(state, def, base, next, check, equiv[(u8) c]);
 	} else
 		match_char(state, def, base, next, check, (u8) c);
+
+	return state;
+}
+
+unsigned int aa_dfa_outofband_transition(struct aa_dfa *dfa, unsigned int state)
+{
+	u16 *def = DEFAULT_TABLE(dfa);
+	u32 *base = BASE_TABLE(dfa);
+	u16 *next = NEXT_TABLE(dfa);
+	u16 *check = CHECK_TABLE(dfa);
+	u32 b = (base)[(state)];
+
+	if (!(b & MATCH_FLAG_OOB_TRANSITION))
+		return DFA_NOMATCH;
+
+	/* No Equivalence class remapping for outofband transitions */
+	match_char(state, def, base, next, check, -1);
 
 	return state;
 }

security/apparmor/path.c

···
 			error = PTR_ERR(res);
 			*name = buf;
 			goto out;
-		};
+		}
 	} else if (!our_mnt(path->mnt))
 		connected = 0;
 

security/apparmor/policy.c

···
 
 	kzfree(profile->hash);
 	aa_put_loaddata(profile->rawdata);
+	aa_label_destroy(&profile->label);
 
 	kzfree(profile);
 }

security/apparmor/policy_unpack.c

···
 static bool unpack_X(struct aa_ext *e, enum aa_code code)
 {
 	if (!inbounds(e, 1))
-		return 0;
+		return false;
 	if (*(u8 *) e->pos != code)
-		return 0;
+		return false;
 	e->pos++;
-	return 1;
+	return true;
 }
 
 /**
···
  * name element in the stream.  If @name is NULL any name element will be
  * skipped and only the typecode will be tested.
  *
- * Returns 1 on success (both type code and name tests match) and the read
+ * Returns true on success (both type code and name tests match) and the read
  * head is advanced past the headers
  *
- * Returns: 0 if either match fails, the read head does not move
+ * Returns: false if either match fails, the read head does not move
  */
 static bool unpack_nameX(struct aa_ext *e, enum aa_code code, const char *name)
 {
···
 
 	/* now check if type code matches */
 	if (unpack_X(e, code))
-		return 1;
+		return true;
 
 fail:
 	e->pos = pos;
-	return 0;
+	return false;
 }
 
 static bool unpack_u8(struct aa_ext *e, u8 *data, const char *name)
···
 		if (data)
 			*data = get_unaligned((u8 *)e->pos);
 		e->pos += sizeof(u8);
-		return 1;
+		return true;
 	}
 
 fail:
 	e->pos = pos;
-	return 0;
+	return false;
 }
 
 static bool unpack_u32(struct aa_ext *e, u32 *data, const char *name)
···
 		if (data)
 			*data = le32_to_cpu(get_unaligned((__le32 *) e->pos));
 		e->pos += sizeof(u32);
-		return 1;
+		return true;
 	}
 
 fail:
 	e->pos = pos;
-	return 0;
+	return false;
 }
 
 static bool unpack_u64(struct aa_ext *e, u64 *data, const char *name)
···
 		if (data)
 			*data = le64_to_cpu(get_unaligned((__le64 *) e->pos));
 		e->pos += sizeof(u64);
-		return 1;
+		return true;
 	}
 
 fail:
 	e->pos = pos;
-	return 0;
+	return false;
 }
 
 static size_t unpack_array(struct aa_ext *e, const char *name)
···
  * @e: serialized data extent information  (NOT NULL)
  * @profile: profile to add the accept table to (NOT NULL)
  *
- * Returns: 1 if table successfully unpacked
+ * Returns: true if table successfully unpacked
  */
 static bool unpack_trans_table(struct aa_ext *e, struct aa_profile *profile)
 {
···
 		if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 			goto fail;
 	}
-	return 1;
+	return true;
 
 fail:
 	aa_free_domain_entries(&profile->file.trans);
 	e->pos = saved_pos;
-	return 0;
+	return false;
 }
 
 static bool unpack_xattrs(struct aa_ext *e, struct aa_profile *profile)
···
 			goto fail;
 	}
 
-	return 1;
+	return true;
 
 fail:
 	e->pos = pos;
-	return 0;
+	return false;
 }
 
 static bool unpack_secmark(struct aa_ext *e, struct aa_profile *profile)
···
 			goto fail;
 	}
 
-	return 1;
+	return true;
 
 fail:
 	if (profile->secmark) {
···
 	}
 
 	e->pos = pos;
-	return 0;
+	return false;
 }
 
 static bool unpack_rlimits(struct aa_ext *e, struct aa_profile *profile)
···
 		if (!unpack_nameX(e, AA_STRUCTEND, NULL))
 			goto fail;
 	}
-	return 1;
+	return true;
 
 fail:
 	e->pos = pos;
-	return 0;
+	return false;
 }
 
 static u32 strhash(const void *data, u32 len, u32 seed)
···
 		goto fail;
 	if (tmp == PACKED_MODE_COMPLAIN || (e->version & FORCE_COMPLAIN_FLAG))
 		profile->mode = APPARMOR_COMPLAIN;
+	else if (tmp == PACKED_MODE_ENFORCE)
+		profile->mode = APPARMOR_ENFORCE;
 	else if (tmp == PACKED_MODE_KILL)
 		profile->mode = APPARMOR_KILL;
 	else if (tmp == PACKED_MODE_UNCONFINED)
 		profile->mode = APPARMOR_UNCONFINED;
+	else
+		goto fail;
 	if (!unpack_u32(e, &tmp, NULL))
 		goto fail;
 	if (tmp)
···
 	xtype = xindex & AA_X_TYPE_MASK;
 	index = xindex & AA_X_INDEX_MASK;
 	if (xtype == AA_X_TABLE && index >= table_size)
-		return 0;
-	return 1;
+		return false;
+	return true;
 }
 
 /* verify dfa xindexes are in range of transition tables */
···
 	int i;
 	for (i = 0; i < dfa->tables[YYTD_ID_ACCEPT]->td_lolen; i++) {
 		if (!verify_xindex(dfa_user_xindex(dfa, i), table_size))
-			return 0;
+			return false;
 		if (!verify_xindex(dfa_other_xindex(dfa, i), table_size))
-			return 0;
+			return false;
 	}
-	return 1;
+	return true;
 }
 
 /**