ARM: 6003/1: removing compilation warning from pl061.h

[safe/jmp/linux-2.6] / security / keys / proc.c

diff --git a/security/keys/proc.c b/security/keys/proc.c
index e54679b..9d01021 100644 (file)
--- a/security/keys/proc.c
+++ b/security/keys/proc.c
@@ -91,37 +91,94 @@ __initcall(key_proc_init);
  */
 #ifdef CONFIG_KEYS_DEBUG_PROC_KEYS
 
+static struct rb_node *key_serial_next(struct rb_node *n)
+{
+       struct user_namespace *user_ns = current_user_ns();
+
+       n = rb_next(n);
+       while (n) {
+               struct key *key = rb_entry(n, struct key, serial_node);
+               if (key->user->user_ns == user_ns)
+                       break;
+               n = rb_next(n);
+       }
+       return n;
+}
+
 static int proc_keys_open(struct inode *inode, struct file *file)
 {
        return seq_open(file, &proc_keys_ops);
+}
 
+static struct key *find_ge_key(key_serial_t id)
+{
+       struct user_namespace *user_ns = current_user_ns();
+       struct rb_node *n = key_serial_tree.rb_node;
+       struct key *minkey = NULL;
+
+       while (n) {
+               struct key *key = rb_entry(n, struct key, serial_node);
+               if (id < key->serial) {
+                       if (!minkey || minkey->serial > key->serial)
+                               minkey = key;
+                       n = n->rb_left;
+               } else if (id > key->serial) {
+                       n = n->rb_right;
+               } else {
+                       minkey = key;
+                       break;
+               }
+               key = NULL;
+       }
+
+       if (!minkey)
+               return NULL;
+
+       for (;;) {
+               if (minkey->user->user_ns == user_ns)
+                       return minkey;
+               n = rb_next(&minkey->serial_node);
+               if (!n)
+                       return NULL;
+               minkey = rb_entry(n, struct key, serial_node);
+       }
 }
 
 static void *proc_keys_start(struct seq_file *p, loff_t *_pos)
+       __acquires(key_serial_lock)
 {
-       struct rb_node *_p;
-       loff_t pos = *_pos;
+       key_serial_t pos = *_pos;
+       struct key *key;
 
        spin_lock(&key_serial_lock);
 
-       _p = rb_first(&key_serial_tree);
-       while (pos > 0 && _p) {
-               pos--;
-               _p = rb_next(_p);
-       }
-
-       return _p;
+       if (*_pos > INT_MAX)
+               return NULL;
+       key = find_ge_key(pos);
+       if (!key)
+               return NULL;
+       *_pos = key->serial;
+       return &key->serial_node;
+}
 
+static inline key_serial_t key_node_serial(struct rb_node *n)
+{
+       struct key *key = rb_entry(n, struct key, serial_node);
+       return key->serial;
 }
 
 static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
 {
-       (*_pos)++;
-       return rb_next((struct rb_node *) v);
+       struct rb_node *n;
 
+       n = key_serial_next(v);
+       if (n)
+               *_pos = key_node_serial(n);
+       return n;
 }
 
 static void proc_keys_stop(struct seq_file *p, void *v)
+       __releases(key_serial_lock)
 {
        spin_unlock(&key_serial_lock);
 }
@@ -136,8 +193,12 @@ static int proc_keys_show(struct seq_file *m, void *v)
        int rc;
 
        /* check whether the current task is allowed to view the key (assuming
-        * non-possession) */
-       rc = key_task_permission(make_key_ref(key, 0), current, KEY_VIEW);
+        * non-possession)
+        * - the caller holds a spinlock, and thus the RCU read lock, making our
+        *   access to __current_cred() safe
+        */
+       rc = key_task_permission(make_key_ref(key, 0), current_cred(),
+                                KEY_VIEW);
        if (rc < 0)
                return 0;
 
@@ -148,11 +209,9 @@ static int proc_keys_show(struct seq_file *m, void *v)
        /* come up with a suitable timeout value */
        if (key->expiry == 0) {
                memcpy(xbuf, "perm", 5);
-       }
-       else if (now.tv_sec >= key->expiry) {
+       } else if (now.tv_sec >= key->expiry) {
                memcpy(xbuf, "expd", 5);
-       }
-       else {
+       } else {
                timo = key->expiry - now.tv_sec;
 
                if (timo < 60)
@@ -192,13 +251,33 @@ static int proc_keys_show(struct seq_file *m, void *v)
        seq_putc(m, '\n');
 
        rcu_read_unlock();
-
        return 0;
-
 }
 
 #endif /* CONFIG_KEYS_DEBUG_PROC_KEYS */
 
+static struct rb_node *__key_user_next(struct rb_node *n)
+{
+       while (n) {
+               struct key_user *user = rb_entry(n, struct key_user, node);
+               if (user->user_ns == current_user_ns())
+                       break;
+               n = rb_next(n);
+       }
+       return n;
+}
+
+static struct rb_node *key_user_next(struct rb_node *n)
+{
+       return __key_user_next(rb_next(n));
+}
+
+static struct rb_node *key_user_first(struct rb_root *r)
+{
+       struct rb_node *n = rb_first(r);
+       return __key_user_next(n);
+}
+
 /*****************************************************************************/
 /*
  * implement "/proc/key-users" to provides a list of the key users
@@ -206,34 +285,33 @@ static int proc_keys_show(struct seq_file *m, void *v)
 static int proc_key_users_open(struct inode *inode, struct file *file)
 {
        return seq_open(file, &proc_key_users_ops);
-
 }
 
 static void *proc_key_users_start(struct seq_file *p, loff_t *_pos)
+       __acquires(key_user_lock)
 {
        struct rb_node *_p;
        loff_t pos = *_pos;
 
        spin_lock(&key_user_lock);
 
-       _p = rb_first(&key_user_tree);
+       _p = key_user_first(&key_user_tree);
        while (pos > 0 && _p) {
                pos--;
-               _p = rb_next(_p);
+               _p = key_user_next(_p);
        }
 
        return _p;
-
 }
 
 static void *proc_key_users_next(struct seq_file *p, void *v, loff_t *_pos)
 {
        (*_pos)++;
-       return rb_next((struct rb_node *) v);
-
+       return key_user_next((struct rb_node *) v);
 }
 
 static void proc_key_users_stop(struct seq_file *p, void *v)
+       __releases(key_user_lock)
 {
        spin_unlock(&key_user_lock);
 }
@@ -242,6 +320,10 @@ static int proc_key_users_show(struct seq_file *m, void *v)
 {
        struct rb_node *_p = v;
        struct key_user *user = rb_entry(_p, struct key_user, node);
+       unsigned maxkeys = (user->uid == 0) ?
+               key_quota_root_maxkeys : key_quota_maxkeys;
+       unsigned maxbytes = (user->uid == 0) ?
+               key_quota_root_maxbytes : key_quota_maxbytes;
 
        seq_printf(m, "%5u: %5d %d/%d %d/%d %d/%d\n",
                   user->uid,
@@ -249,10 +331,9 @@ static int proc_key_users_show(struct seq_file *m, void *v)
                   atomic_read(&user->nkeys),
                   atomic_read(&user->nikeys),
                   user->qnkeys,
-                  KEYQUOTA_MAX_KEYS,
+                  maxkeys,
                   user->qnbytes,
-                  KEYQUOTA_MAX_BYTES
-                  );
+                  maxbytes);
 
        return 0;