Merge tag 'v3.12'

Linux 3.12

4 files changed, 153 insertions, 120 deletions

diff --git a/security/smack/smack.h b/security/smack/smack.h
index 339614c..076b8e8 100644
--- a/security/smack/smack.h
+++ b/security/smack/smack.h
@@ -53,6 +53,7 @@
  */
 struct smack_known {
 	struct list_head		list;
+	struct hlist_node		smk_hashed;
 	char				*smk_known;
 	u32				smk_secid;
 	struct netlbl_lsm_secattr	smk_netlabel;	/* on wire labels */
@@ -167,9 +168,13 @@ struct smk_port_label {
 #define SMACK_CIPSO_DOI_INVALID		-1	/* Not a DOI */
 #define SMACK_CIPSO_DIRECT_DEFAULT	250	/* Arbitrary */
 #define SMACK_CIPSO_MAPPED_DEFAULT	251	/* Also arbitrary */
-#define SMACK_CIPSO_MAXCATVAL		63	/* Bigger gets harder */
 #define SMACK_CIPSO_MAXLEVEL            255     /* CIPSO 2.2 standard */
-#define SMACK_CIPSO_MAXCATNUM           239     /* CIPSO 2.2 standard */
+/*
+ * CIPSO 2.2 standard is 239, but Smack wants to use the
+ * categories in a structured way that limits the value to
+ * the bits in 23 bytes, hence the unusual number.
+ */
+#define SMACK_CIPSO_MAXCATNUM           184     /* 23 * 8 */
 
 /*
  * Flag for transmute access
@@ -222,6 +227,7 @@ char *smk_parse_smack(const char *string, int len);
 int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
 char *smk_import(const char *, int);
 struct smack_known *smk_import_entry(const char *, int);
+void smk_insert_entry(struct smack_known *skp);
 struct smack_known *smk_find_entry(const char *);
 u32 smack_to_secid(const char *);
 
@@ -247,6 +253,9 @@ extern struct list_head smk_netlbladdr_list;
 
 extern struct security_operations smack_ops;
 
+#define SMACK_HASH_SLOTS 16
+extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
+
 /*
  * Is the directory transmuting?
  */
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index 6a0377f..b3b59b1 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -325,6 +325,25 @@ void smack_log(char *subject_label, char *object_label, int request,
 
 DEFINE_MUTEX(smack_known_lock);
 
+struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];
+
+/**
+ * smk_insert_entry - insert a smack label into a hash map,
+ *
+ * this function must be called under smack_known_lock
+ */
+void smk_insert_entry(struct smack_known *skp)
+{
+	unsigned int hash;
+	struct hlist_head *head;
+
+	hash = full_name_hash(skp->smk_known, strlen(skp->smk_known));
+	head = &smack_known_hash[hash & (SMACK_HASH_SLOTS - 1)];
+
+	hlist_add_head_rcu(&skp->smk_hashed, head);
+	list_add_rcu(&skp->list, &smack_known_list);
+}
+
 /**
  * smk_find_entry - find a label on the list, return the list entry
  * @string: a text string that might be a Smack label
@@ -334,12 +353,16 @@ DEFINE_MUTEX(smack_known_lock);
  */
 struct smack_known *smk_find_entry(const char *string)
 {
+	unsigned int hash;
+	struct hlist_head *head;
 	struct smack_known *skp;
 
-	list_for_each_entry_rcu(skp, &smack_known_list, list) {
+	hash = full_name_hash(string, strlen(string));
+	head = &smack_known_hash[hash & (SMACK_HASH_SLOTS - 1)];
+
+	hlist_for_each_entry_rcu(skp, head, smk_hashed)
 		if (strcmp(skp->smk_known, string) == 0)
 			return skp;
-	}
 
 	return NULL;
 }
@@ -475,7 +498,7 @@ struct smack_known *smk_import_entry(const char *string, int len)
 		 * Make sure that the entry is actually
 		 * filled before putting it on the list.
 		 */
-		list_add_rcu(&skp->list, &smack_known_list);
+		smk_insert_entry(skp);
 		goto unlockout;
 	}
 	/*
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index eefbd10..8825375 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -582,7 +582,7 @@ static void smack_inode_free_security(struct inode *inode)
  * Returns 0 if it all works out, -ENOMEM if there's no memory
  */
 static int smack_inode_init_security(struct inode *inode, struct inode *dir,
-				     const struct qstr *qstr, char **name,
+				     const struct qstr *qstr, const char **name,
 				     void **value, size_t *len)
 {
 	struct inode_smack *issp = inode->i_security;
@@ -591,11 +591,8 @@ static int smack_inode_init_security(struct inode *inode, struct inode *dir,
 	char *dsp = smk_of_inode(dir);
 	int may;
 
-	if (name) {
-		*name = kstrdup(XATTR_SMACK_SUFFIX, GFP_NOFS);
-		if (*name == NULL)
-			return -ENOMEM;
-	}
+	if (name)
+		*name = XATTR_SMACK_SUFFIX;
 
 	if (value) {
 		rcu_read_lock();
@@ -3065,6 +3062,8 @@ static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
 {
 	struct smack_known *skp;
 	int found = 0;
+	int acat;
+	int kcat;
 
 	if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
 		/*
@@ -3081,12 +3080,28 @@ static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
 		list_for_each_entry(skp, &smack_known_list, list) {
 			if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
 				continue;
-			if (memcmp(sap->attr.mls.cat,
-				skp->smk_netlabel.attr.mls.cat,
-				SMK_CIPSOLEN) != 0)
-				continue;
-			found = 1;
-			break;
+			/*
+			 * Compare the catsets. Use the netlbl APIs.
+			 */
+			if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
+				if ((skp->smk_netlabel.flags &
+				     NETLBL_SECATTR_MLS_CAT) == 0)
+					found = 1;
+				break;
+			}
+			for (acat = -1, kcat = -1; acat == kcat; ) {
+				acat = netlbl_secattr_catmap_walk(
+					sap->attr.mls.cat, acat + 1);
+				kcat = netlbl_secattr_catmap_walk(
+					skp->smk_netlabel.attr.mls.cat,
+					kcat + 1);
+				if (acat < 0 || kcat < 0)
+					break;
+			}
+			if (acat == kcat) {
+				found = 1;
+				break;
+			}
 		}
 		rcu_read_unlock();
 
@@ -3877,12 +3892,12 @@ static __init void init_smack_known_list(void)
 	/*
 	 * Create the known labels list
 	 */
-	list_add(&smack_known_huh.list, &smack_known_list);
-	list_add(&smack_known_hat.list, &smack_known_list);
-	list_add(&smack_known_star.list, &smack_known_list);
-	list_add(&smack_known_floor.list, &smack_known_list);
-	list_add(&smack_known_invalid.list, &smack_known_list);
-	list_add(&smack_known_web.list, &smack_known_list);
+	smk_insert_entry(&smack_known_huh);
+	smk_insert_entry(&smack_known_hat);
+	smk_insert_entry(&smack_known_star);
+	smk_insert_entry(&smack_known_floor);
+	smk_insert_entry(&smack_known_invalid);
+	smk_insert_entry(&smack_known_web);
 }
 
 /**
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index ab16703..80f4b4a 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -368,56 +368,43 @@ static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
  * @data: string to be parsed, null terminated
  * @rule: Will be filled with Smack parsed rule
  * @import: if non-zero, import labels
- * @change: if non-zero, data is from /smack/change-rule
+ * @tokens: numer of substrings expected in data
  *
- * Returns 0 on success, -1 on failure
+ * Returns number of processed bytes on success, -1 on failure.
  */
-static int smk_parse_long_rule(const char *data, struct smack_parsed_rule *rule,
-				int import, int change)
+static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
+				int import, int tokens)
 {
-	char *subject;
-	char *object;
-	char *access1;
-	char *access2;
-	int datalen;
-	int rc = -1;
+	ssize_t cnt = 0;
+	char *tok[4];
+	int i;
 
-	/* This is inefficient */
-	datalen = strlen(data);
+	/*
+	 * Parsing the rule in-place, filling all white-spaces with '\0'
+	 */
+	for (i = 0; i < tokens; ++i) {
+		while (isspace(data[cnt]))
+			data[cnt++] = '\0';
 
-	/* Our first element can be 64 + \0 with no spaces */
-	subject = kzalloc(datalen + 1, GFP_KERNEL);
-	if (subject == NULL)
-		return -1;
-	object = kzalloc(datalen, GFP_KERNEL);
-	if (object == NULL)
-		goto free_out_s;
-	access1 = kzalloc(datalen, GFP_KERNEL);
-	if (access1 == NULL)
-		goto free_out_o;
-	access2 = kzalloc(datalen, GFP_KERNEL);
-	if (access2 == NULL)
-		goto free_out_a;
-
-	if (change) {
-		if (sscanf(data, "%s %s %s %s",
-			subject, object, access1, access2) == 4)
-			rc = smk_fill_rule(subject, object, access1, access2,
-				rule, import, 0);
-	} else {
-		if (sscanf(data, "%s %s %s", subject, object, access1) == 3)
-			rc = smk_fill_rule(subject, object, access1, NULL,
-				rule, import, 0);
+		if (data[cnt] == '\0')
+			/* Unexpected end of data */
+			return -1;
+
+		tok[i] = data + cnt;
+
+		while (data[cnt] && !isspace(data[cnt]))
+			++cnt;
 	}
+	while (isspace(data[cnt]))
+		data[cnt++] = '\0';
 
-	kfree(access2);
-free_out_a:
-	kfree(access1);
-free_out_o:
-	kfree(object);
-free_out_s:
-	kfree(subject);
-	return rc;
+	while (i < 4)
+		tok[i++] = NULL;
+
+	if (smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0))
+		return -1;
+
+	return cnt;
 }
 
 #define SMK_FIXED24_FMT	0	/* Fixed 24byte label format */
@@ -447,11 +434,12 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
 					struct list_head *rule_list,
 					struct mutex *rule_lock, int format)
 {
-	struct smack_parsed_rule *rule;
+	struct smack_parsed_rule rule;
 	char *data;
-	int datalen;
-	int rc = -EINVAL;
-	int load = 0;
+	int rc;
+	int trunc = 0;
+	int tokens;
+	ssize_t cnt = 0;
 
 	/*
 	 * No partial writes.
@@ -466,11 +454,14 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
 		 */
 		if (count != SMK_OLOADLEN && count != SMK_LOADLEN)
 			return -EINVAL;
-		datalen = SMK_LOADLEN;
-	} else
-		datalen = count + 1;
+	} else {
+		if (count >= PAGE_SIZE) {
+			count = PAGE_SIZE - 1;
+			trunc = 1;
+		}
+	}
 
-	data = kzalloc(datalen, GFP_KERNEL);
+	data = kmalloc(count + 1, GFP_KERNEL);
 	if (data == NULL)
 		return -ENOMEM;
 
@@ -479,47 +470,49 @@ static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
 		goto out;
 	}
 
-	rule = kzalloc(sizeof(*rule), GFP_KERNEL);
-	if (rule == NULL) {
-		rc = -ENOMEM;
-		goto out;
+	/*
+	 * In case of parsing only part of user buf,
+	 * avoid having partial rule at the data buffer
+	 */
+	if (trunc) {
+		while (count > 0 && (data[count - 1] != '\n'))
+			--count;
+		if (count == 0) {
+			rc = -EINVAL;
+			goto out;
+		}
 	}
 
-	if (format == SMK_LONG_FMT) {
-		/*
-		 * Be sure the data string is terminated.
-		 */
-		data[count] = '\0';
-		if (smk_parse_long_rule(data, rule, 1, 0))
-			goto out_free_rule;
-	} else if (format == SMK_CHANGE_FMT) {
-		data[count] = '\0';
-		if (smk_parse_long_rule(data, rule, 1, 1))
-			goto out_free_rule;
-	} else {
-		/*
-		 * More on the minor hack for backward compatibility
-		 */
-		if (count == (SMK_OLOADLEN))
-			data[SMK_OLOADLEN] = '-';
-		if (smk_parse_rule(data, rule, 1))
-			goto out_free_rule;
-	}
+	data[count] = '\0';
+	tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
+	while (cnt < count) {
+		if (format == SMK_FIXED24_FMT) {
+			rc = smk_parse_rule(data, &rule, 1);
+			if (rc != 0) {
+				rc = -EINVAL;
+				goto out;
+			}
+			cnt = count;
+		} else {
+			rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
+			if (rc <= 0) {
+				rc = -EINVAL;
+				goto out;
+			}
+			cnt += rc;
+		}
 
-	if (rule_list == NULL) {
-		load = 1;
-		rule_list = &rule->smk_subject->smk_rules;
-		rule_lock = &rule->smk_subject->smk_rules_lock;
-	}
+		if (rule_list == NULL)
+			rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
+				&rule.smk_subject->smk_rules_lock, 1);
+		else
+			rc = smk_set_access(&rule, rule_list, rule_lock, 0);
 
-	rc = smk_set_access(rule, rule_list, rule_lock, load);
-	if (rc == 0) {
-		rc = count;
-		goto out;
+		if (rc)
+			goto out;
 	}
 
-out_free_rule:
-	kfree(rule);
+	rc = cnt;
 out:
 	kfree(data);
 	return rc;
@@ -901,7 +894,7 @@ static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
 	for (i = 0; i < catlen; i++) {
 		rule += SMK_DIGITLEN;
 		ret = sscanf(rule, "%u", &cat);
-		if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
+		if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
 			goto out;
 
 		smack_catset_bit(cat, mapcatset);
@@ -1840,7 +1833,6 @@ static ssize_t smk_user_access(struct file *file, const char __user *buf,
 {
 	struct smack_parsed_rule rule;
 	char *data;
-	char *cod;
 	int res;
 
 	data = simple_transaction_get(file, buf, count);
@@ -1853,18 +1845,12 @@ static ssize_t smk_user_access(struct file *file, const char __user *buf,
 		res = smk_parse_rule(data, &rule, 0);
 	} else {
 		/*
-		 * Copy the data to make sure the string is terminated.
+		 * simple_transaction_get() returns null-terminated data
 		 */
-		cod = kzalloc(count + 1, GFP_KERNEL);
-		if (cod == NULL)
-			return -ENOMEM;
-		memcpy(cod, data, count);
-		cod[count] = '\0';
-		res = smk_parse_long_rule(cod, &rule, 0, 0);
-		kfree(cod);
+		res = smk_parse_long_rule(data, &rule, 0, 3);
 	}
 
-	if (res)
+	if (res < 0)
 		return -EINVAL;
 
 	res = smk_access(rule.smk_subject, rule.smk_object,