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-rw-r--r--security/keys/process_keys.c42
1 files changed, 21 insertions, 21 deletions
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index 059c350..972e301 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -1,6 +1,6 @@
/* process_keys.c: management of a process's keyrings
*
- * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
@@ -181,7 +181,7 @@ static int install_process_keyring(struct task_struct *tsk)
goto error;
}
- /* attach or swap keyrings */
+ /* attach keyring */
spin_lock_irqsave(&tsk->sighand->siglock, flags);
if (!tsk->signal->process_keyring) {
tsk->signal->process_keyring = keyring;
@@ -227,12 +227,14 @@ static int install_session_keyring(struct task_struct *tsk,
/* install the keyring */
spin_lock_irqsave(&tsk->sighand->siglock, flags);
- old = tsk->signal->session_keyring;
- tsk->signal->session_keyring = keyring;
+ old = rcu_dereference(tsk->signal->session_keyring);
+ rcu_assign_pointer(tsk->signal->session_keyring, keyring);
spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
ret = 0;
+ /* we're using RCU on the pointer */
+ synchronize_kernel();
key_put(old);
error:
return ret;
@@ -245,8 +247,6 @@ static int install_session_keyring(struct task_struct *tsk,
*/
int copy_thread_group_keys(struct task_struct *tsk)
{
- unsigned long flags;
-
key_check(current->thread_group->session_keyring);
key_check(current->thread_group->process_keyring);
@@ -254,10 +254,10 @@ int copy_thread_group_keys(struct task_struct *tsk)
tsk->signal->process_keyring = NULL;
/* same session keyring */
- spin_lock_irqsave(&current->sighand->siglock, flags);
+ rcu_read_lock();
tsk->signal->session_keyring =
- key_get(current->signal->session_keyring);
- spin_unlock_irqrestore(&current->sighand->siglock, flags);
+ key_get(rcu_dereference(current->signal->session_keyring));
+ rcu_read_unlock();
return 0;
@@ -381,8 +381,7 @@ struct key *search_process_keyrings_aux(struct key_type *type,
key_match_func_t match)
{
struct task_struct *tsk = current;
- unsigned long flags;
- struct key *key, *ret, *err, *tmp;
+ struct key *key, *ret, *err;
/* we want to return -EAGAIN or -ENOKEY if any of the keyrings were
* searchable, but we failed to find a key or we found a negative key;
@@ -436,17 +435,18 @@ struct key *search_process_keyrings_aux(struct key_type *type,
}
/* search the session keyring last */
- spin_lock_irqsave(&tsk->sighand->siglock, flags);
-
- tmp = tsk->signal->session_keyring;
- if (!tmp)
- tmp = tsk->user->session_keyring;
- atomic_inc(&tmp->usage);
-
- spin_unlock_irqrestore(&tsk->sighand->siglock, flags);
+ if (tsk->signal->session_keyring) {
+ rcu_read_lock();
+ key = keyring_search_aux(
+ rcu_dereference(tsk->signal->session_keyring),
+ type, description, match);
+ rcu_read_unlock();
+ }
+ else {
+ key = keyring_search_aux(tsk->user->session_keyring,
+ type, description, match);
+ }
- key = keyring_search_aux(tmp, type, description, match);
- key_put(tmp);
if (!IS_ERR(key))
goto found;
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