aboutsummaryrefslogtreecommitdiff
path: root/security/smack/smackfs.c
diff options
context:
space:
mode:
Diffstat (limited to 'security/smack/smackfs.c')
-rw-r--r--security/smack/smackfs.c370
1 files changed, 255 insertions, 115 deletions
diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c
index 362d5eda948b..90d1bbaaa6f3 100644
--- a/security/smack/smackfs.c
+++ b/security/smack/smackfs.c
@@ -43,6 +43,7 @@ enum smk_inos {
SMK_NETLBLADDR = 8, /* single label hosts */
SMK_ONLYCAP = 9, /* the only "capable" label */
SMK_LOGGING = 10, /* logging */
+ SMK_LOAD_SELF = 11, /* task specific rules */
};
/*
@@ -135,104 +136,30 @@ static void smk_netlabel_audit_set(struct netlbl_audit *nap)
#define SMK_NETLBLADDRMIN 9
#define SMK_NETLBLADDRMAX 42
-/*
- * Seq_file read operations for /smack/load
- */
-
-static void *load_seq_start(struct seq_file *s, loff_t *pos)
-{
- if (*pos == SEQ_READ_FINISHED)
- return NULL;
- if (list_empty(&smack_rule_list))
- return NULL;
- return smack_rule_list.next;
-}
-
-static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
-{
- struct list_head *list = v;
-
- if (list_is_last(list, &smack_rule_list)) {
- *pos = SEQ_READ_FINISHED;
- return NULL;
- }
- return list->next;
-}
-
-static int load_seq_show(struct seq_file *s, void *v)
-{
- struct list_head *list = v;
- struct smack_rule *srp =
- list_entry(list, struct smack_rule, list);
-
- seq_printf(s, "%s %s", (char *)srp->smk_subject,
- (char *)srp->smk_object);
-
- seq_putc(s, ' ');
-
- if (srp->smk_access & MAY_READ)
- seq_putc(s, 'r');
- if (srp->smk_access & MAY_WRITE)
- seq_putc(s, 'w');
- if (srp->smk_access & MAY_EXEC)
- seq_putc(s, 'x');
- if (srp->smk_access & MAY_APPEND)
- seq_putc(s, 'a');
- if (srp->smk_access & MAY_TRANSMUTE)
- seq_putc(s, 't');
- if (srp->smk_access == 0)
- seq_putc(s, '-');
-
- seq_putc(s, '\n');
-
- return 0;
-}
-
-static void load_seq_stop(struct seq_file *s, void *v)
-{
- /* No-op */
-}
-
-static const struct seq_operations load_seq_ops = {
- .start = load_seq_start,
- .next = load_seq_next,
- .show = load_seq_show,
- .stop = load_seq_stop,
-};
-
-/**
- * smk_open_load - open() for /smack/load
- * @inode: inode structure representing file
- * @file: "load" file pointer
- *
- * For reading, use load_seq_* seq_file reading operations.
- */
-static int smk_open_load(struct inode *inode, struct file *file)
-{
- return seq_open(file, &load_seq_ops);
-}
-
/**
* smk_set_access - add a rule to the rule list
* @srp: the new rule to add
+ * @rule_list: the list of rules
+ * @rule_lock: the rule list lock
*
* Looks through the current subject/object/access list for
* the subject/object pair and replaces the access that was
* there. If the pair isn't found add it with the specified
* access.
*
+ * Returns 1 if a rule was found to exist already, 0 if it is new
* Returns 0 if nothing goes wrong or -ENOMEM if it fails
* during the allocation of the new pair to add.
*/
-static int smk_set_access(struct smack_rule *srp)
+static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list,
+ struct mutex *rule_lock)
{
struct smack_rule *sp;
- int ret = 0;
- int found;
- mutex_lock(&smack_list_lock);
+ int found = 0;
- found = 0;
- list_for_each_entry_rcu(sp, &smack_rule_list, list) {
+ mutex_lock(rule_lock);
+
+ list_for_each_entry_rcu(sp, rule_list, list) {
if (sp->smk_subject == srp->smk_subject &&
sp->smk_object == srp->smk_object) {
found = 1;
@@ -241,19 +168,21 @@ static int smk_set_access(struct smack_rule *srp)
}
}
if (found == 0)
- list_add_rcu(&srp->list, &smack_rule_list);
+ list_add_rcu(&srp->list, rule_list);
- mutex_unlock(&smack_list_lock);
+ mutex_unlock(rule_lock);
- return ret;
+ return found;
}
/**
- * smk_write_load - write() for /smack/load
+ * smk_write_load_list - write() for any /smack/load
* @file: file pointer, not actually used
* @buf: where to get the data from
* @count: bytes sent
* @ppos: where to start - must be 0
+ * @rule_list: the list of rules to write to
+ * @rule_lock: lock for the rule list
*
* Get one smack access rule from above.
* The format is exactly:
@@ -263,21 +192,19 @@ static int smk_set_access(struct smack_rule *srp)
*
* writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes.
*/
-static ssize_t smk_write_load(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
+static ssize_t smk_write_load_list(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos,
+ struct list_head *rule_list,
+ struct mutex *rule_lock)
{
struct smack_rule *rule;
char *data;
int rc = -EINVAL;
/*
- * Must have privilege.
* No partial writes.
* Enough data must be present.
*/
- if (!capable(CAP_MAC_ADMIN))
- return -EPERM;
-
if (*ppos != 0)
return -EINVAL;
/*
@@ -372,11 +299,13 @@ static ssize_t smk_write_load(struct file *file, const char __user *buf,
goto out_free_rule;
}
- rc = smk_set_access(rule);
-
- if (!rc)
- rc = count;
- goto out;
+ rc = count;
+ /*
+ * smk_set_access returns true if there was already a rule
+ * for the subject/object pair, and false if it was new.
+ */
+ if (!smk_set_access(rule, rule_list, rule_lock))
+ goto out;
out_free_rule:
kfree(rule);
@@ -385,6 +314,108 @@ out:
return rc;
}
+
+/*
+ * Seq_file read operations for /smack/load
+ */
+
+static void *load_seq_start(struct seq_file *s, loff_t *pos)
+{
+ if (*pos == SEQ_READ_FINISHED)
+ return NULL;
+ if (list_empty(&smack_rule_list))
+ return NULL;
+ return smack_rule_list.next;
+}
+
+static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ struct list_head *list = v;
+
+ if (list_is_last(list, &smack_rule_list)) {
+ *pos = SEQ_READ_FINISHED;
+ return NULL;
+ }
+ return list->next;
+}
+
+static int load_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smack_rule *srp =
+ list_entry(list, struct smack_rule, list);
+
+ seq_printf(s, "%s %s", (char *)srp->smk_subject,
+ (char *)srp->smk_object);
+
+ seq_putc(s, ' ');
+
+ if (srp->smk_access & MAY_READ)
+ seq_putc(s, 'r');
+ if (srp->smk_access & MAY_WRITE)
+ seq_putc(s, 'w');
+ if (srp->smk_access & MAY_EXEC)
+ seq_putc(s, 'x');
+ if (srp->smk_access & MAY_APPEND)
+ seq_putc(s, 'a');
+ if (srp->smk_access & MAY_TRANSMUTE)
+ seq_putc(s, 't');
+ if (srp->smk_access == 0)
+ seq_putc(s, '-');
+
+ seq_putc(s, '\n');
+
+ return 0;
+}
+
+static void load_seq_stop(struct seq_file *s, void *v)
+{
+ /* No-op */
+}
+
+static const struct seq_operations load_seq_ops = {
+ .start = load_seq_start,
+ .next = load_seq_next,
+ .show = load_seq_show,
+ .stop = load_seq_stop,
+};
+
+/**
+ * smk_open_load - open() for /smack/load
+ * @inode: inode structure representing file
+ * @file: "load" file pointer
+ *
+ * For reading, use load_seq_* seq_file reading operations.
+ */
+static int smk_open_load(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &load_seq_ops);
+}
+
+/**
+ * smk_write_load - write() for /smack/load
+ * @file: file pointer, not actually used
+ * @buf: where to get the data from
+ * @count: bytes sent
+ * @ppos: where to start - must be 0
+ *
+ */
+static ssize_t smk_write_load(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+
+ /*
+ * Must have privilege.
+ * No partial writes.
+ * Enough data must be present.
+ */
+ if (!capable(CAP_MAC_ADMIN))
+ return -EPERM;
+
+ return smk_write_load_list(file, buf, count, ppos, &smack_rule_list,
+ &smack_list_lock);
+}
+
static const struct file_operations smk_load_ops = {
.open = smk_open_load,
.read = seq_read,
@@ -1288,6 +1319,112 @@ static const struct file_operations smk_logging_ops = {
.write = smk_write_logging,
.llseek = default_llseek,
};
+
+/*
+ * Seq_file read operations for /smack/load-self
+ */
+
+static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
+{
+ struct task_smack *tsp = current_security();
+
+ if (*pos == SEQ_READ_FINISHED)
+ return NULL;
+ if (list_empty(&tsp->smk_rules))
+ return NULL;
+ return tsp->smk_rules.next;
+}
+
+static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
+{
+ struct task_smack *tsp = current_security();
+ struct list_head *list = v;
+
+ if (list_is_last(list, &tsp->smk_rules)) {
+ *pos = SEQ_READ_FINISHED;
+ return NULL;
+ }
+ return list->next;
+}
+
+static int load_self_seq_show(struct seq_file *s, void *v)
+{
+ struct list_head *list = v;
+ struct smack_rule *srp =
+ list_entry(list, struct smack_rule, list);
+
+ seq_printf(s, "%s %s", (char *)srp->smk_subject,
+ (char *)srp->smk_object);
+
+ seq_putc(s, ' ');
+
+ if (srp->smk_access & MAY_READ)
+ seq_putc(s, 'r');
+ if (srp->smk_access & MAY_WRITE)
+ seq_putc(s, 'w');
+ if (srp->smk_access & MAY_EXEC)
+ seq_putc(s, 'x');
+ if (srp->smk_access & MAY_APPEND)
+ seq_putc(s, 'a');
+ if (srp->smk_access & MAY_TRANSMUTE)
+ seq_putc(s, 't');
+ if (srp->smk_access == 0)
+ seq_putc(s, '-');
+
+ seq_putc(s, '\n');
+
+ return 0;
+}
+
+static void load_self_seq_stop(struct seq_file *s, void *v)
+{
+ /* No-op */
+}
+
+static const struct seq_operations load_self_seq_ops = {
+ .start = load_self_seq_start,
+ .next = load_self_seq_next,
+ .show = load_self_seq_show,
+ .stop = load_self_seq_stop,
+};
+
+
+/**
+ * smk_open_load_self - open() for /smack/load-self
+ * @inode: inode structure representing file
+ * @file: "load" file pointer
+ *
+ * For reading, use load_seq_* seq_file reading operations.
+ */
+static int smk_open_load_self(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &load_self_seq_ops);
+}
+
+/**
+ * smk_write_load_self - write() for /smack/load-self
+ * @file: file pointer, not actually used
+ * @buf: where to get the data from
+ * @count: bytes sent
+ * @ppos: where to start - must be 0
+ *
+ */
+static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct task_smack *tsp = current_security();
+
+ return smk_write_load_list(file, buf, count, ppos, &tsp->smk_rules,
+ &tsp->smk_rules_lock);
+}
+
+static const struct file_operations smk_load_self_ops = {
+ .open = smk_open_load_self,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .write = smk_write_load_self,
+ .release = seq_release,
+};
/**
* smk_fill_super - fill the /smackfs superblock
* @sb: the empty superblock
@@ -1304,23 +1441,26 @@ static int smk_fill_super(struct super_block *sb, void *data, int silent)
struct inode *root_inode;
static struct tree_descr smack_files[] = {
- [SMK_LOAD] =
- {"load", &smk_load_ops, S_IRUGO|S_IWUSR},
- [SMK_CIPSO] =
- {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
- [SMK_DOI] =
- {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
- [SMK_DIRECT] =
- {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
- [SMK_AMBIENT] =
- {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
- [SMK_NETLBLADDR] =
- {"netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
- [SMK_ONLYCAP] =
- {"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
- [SMK_LOGGING] =
- {"logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
- /* last one */ {""}
+ [SMK_LOAD] = {
+ "load", &smk_load_ops, S_IRUGO|S_IWUSR},
+ [SMK_CIPSO] = {
+ "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
+ [SMK_DOI] = {
+ "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
+ [SMK_DIRECT] = {
+ "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
+ [SMK_AMBIENT] = {
+ "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
+ [SMK_NETLBLADDR] = {
+ "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
+ [SMK_ONLYCAP] = {
+ "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
+ [SMK_LOGGING] = {
+ "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
+ [SMK_LOAD_SELF] = {
+ "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
+ /* last one */
+ {""}
};
rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);