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Commit 8aa14b64 authored by Eric W. Biederman's avatar Eric W. Biederman
Browse files

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: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
parent f95732e2

kernel/audit.c

+13 −25
Original line number Diff line number Diff line
@@ -866,41 +866,29 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 
		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)) {

		spin_lock_irq(&tsk->sighand->siglock);

		s.enabled = tsk->signal->audit_tty != 0;

			unlock_task_sighand(tsk, &flags);

		} else

			err = -ESRCH;

		rcu_read_unlock();

		spin_unlock_irq(&tsk->sighand->siglock);



		if (!err)

		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)) {



		spin_lock_irq(&tsk->sighand->siglock);

		tsk->signal->audit_tty = s->enabled != 0;

			unlock_task_sighand(tsk, &flags);

		} else

			err = -ESRCH;

		rcu_read_unlock();

		spin_unlock_irq(&tsk->sighand->siglock);

		break;

	}

	default: