audit: Simply AUDIT_TTY_SET and AUDIT_TTY_GET
Use current instead of looking up the current up the current task by
process identifier. Netlink requests are processed in trhe context of
the sending task so this is safe.
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric Paris <eparis@redhat.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
diff --git a/kernel/audit.c b/kernel/audit.c
index 58f704b..2a8728f 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -866,41 +866,29 @@
break;
case AUDIT_TTY_GET: {
struct audit_tty_status s;
- struct task_struct *tsk;
- unsigned long flags;
+ struct task_struct *tsk = current;
- rcu_read_lock();
- tsk = find_task_by_vpid(pid);
- if (tsk && lock_task_sighand(tsk, &flags)) {
- s.enabled = tsk->signal->audit_tty != 0;
- unlock_task_sighand(tsk, &flags);
- } else
- err = -ESRCH;
- rcu_read_unlock();
+ spin_lock_irq(&tsk->sighand->siglock);
+ s.enabled = tsk->signal->audit_tty != 0;
+ spin_unlock_irq(&tsk->sighand->siglock);
- if (!err)
- audit_send_reply(NETLINK_CB(skb).pid, seq,
- AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
+ audit_send_reply(NETLINK_CB(skb).pid, seq,
+ AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
break;
}
case AUDIT_TTY_SET: {
struct audit_tty_status *s;
- struct task_struct *tsk;
- unsigned long flags;
+ struct task_struct *tsk = current;
if (nlh->nlmsg_len < sizeof(struct audit_tty_status))
return -EINVAL;
s = data;
if (s->enabled != 0 && s->enabled != 1)
return -EINVAL;
- rcu_read_lock();
- tsk = find_task_by_vpid(pid);
- if (tsk && lock_task_sighand(tsk, &flags)) {
- tsk->signal->audit_tty = s->enabled != 0;
- unlock_task_sighand(tsk, &flags);
- } else
- err = -ESRCH;
- rcu_read_unlock();
+
+ spin_lock_irq(&tsk->sighand->siglock);
+ tsk->signal->audit_tty = s->enabled != 0;
+ spin_unlock_irq(&tsk->sighand->siglock);
break;
}
default:
