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);