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authorEric W. Biederman <ebiederm@xmission.com>2012-09-10 23:43:14 -0700
committerEric W. Biederman <ebiederm@xmission.com>2012-09-17 18:04:33 -0700
commit8aa14b64981ee4b95959e1ed331b672d053aab62 (patch)
tree961b0db4505ea2885562a0fd230bf67503f5cd28 /kernel/audit.c
parentf95732e2e0a649c148be0242b72e3c7473092687 (diff)
downloadlinaro-lsk-8aa14b64981ee4b95959e1ed331b672d053aab62.tar.gz
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>
Diffstat (limited to 'kernel/audit.c')
-rw-r--r--kernel/audit.c38
1 files changed, 13 insertions, 25 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index 58f704b432e..2a8728fdefc 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -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;
-
- 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();
-
- if (!err)
- audit_send_reply(NETLINK_CB(skb).pid, seq,
- AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
+ struct task_struct *tsk = current;
+
+ spin_lock_irq(&tsk->sighand->siglock);
+ s.enabled = tsk->signal->audit_tty != 0;
+ spin_unlock_irq(&tsk->sighand->siglock);
+
+ 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: