netdev - Re: [PATCH Resend] af_unix: dont send SCM_CREDENTIAL when dest socket is NULL

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Date:	Mon, 25 Mar 2013 21:38:07 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	dingtianhong <dingtianhong@...wei.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Li Zefan <lizefan@...wei.com>, Xinwei Hu <huxinwei@...wei.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH Resend] af_unix: dont send SCM_CREDENTIAL when dest
 socket is NULL

On Tue, 2013-03-26 at 11:02 +0800, dingtianhong wrote:
> SCM_SCREDENTIALS should apply to write() syscalls only either source or destination
> socket asserted SOCK_PASSCRED. The original implememtation in maybe_add_creds is wrong,
> and breaks several LSB testcases ( i.e. /tset/LSB.os/netowkr/recvfrom/T.recvfrom).
> 
> Origionally-authored-by: Karel Srot <ksrot@...hat.com>
> Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
> ---
>  net/unix/af_unix.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
> index 51be64f..99189fd 100644
> --- a/net/unix/af_unix.c
> +++ b/net/unix/af_unix.c
> @@ -1413,8 +1413,8 @@ static void maybe_add_creds(struct sk_buff *skb, const struct socket *sock,
>  	if (UNIXCB(skb).cred)
>  		return;
>  	if (test_bit(SOCK_PASSCRED, &sock->flags) ||
> -	    !other->sk_socket ||
> -	    test_bit(SOCK_PASSCRED, &other->sk_socket->flags)) {
> +	    (other->sk_socket &&
> +	    test_bit(SOCK_PASSCRED, &other->sk_socket->flags))) {
>  		UNIXCB(skb).pid  = get_pid(task_tgid(current));
>  		UNIXCB(skb).cred = get_current_cred();
>  	}

Acked-by: Eric Dumazet <edumazet@...gle.com>


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