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audit: Simply AUDIT_TTY_SET and AUDIT_TTY_GET

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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>
This commit is contained in:
Eric W. Biederman 2012-09-10 23:43:14 -07:00
parent f95732e2e0
commit 8aa14b6498
1 changed files with 11 additions and 23 deletions
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34
kernel/audit.c
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@ -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)) {
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: