Re: [REGRESSION] af_unix: Introduce SO_PASSRIGHTS - break OpenGL

[André Almeida]

Hi Kuniyuki,

Em 11/06/2025 13:42, Kuniyuki Iwashima escreveu:
> From: Christian Heusel <christian@xxxxxxxxx>
> Date: Wed, 11 Jun 2025 13:46:01 +0200
> > On 25/06/10 09:22PM, Jacek Łuczak wrote:

[...]

> > > Reverting entire SO_PASSRIGHTS fixes the issue.
>
> Thanks for the report.
>
> Could you test the diff below ?
>
> look like some programs start listen()ing before setting
> SO_PASSCRED or SO_PASSPIDFD and there's a small race window.
>
> ---8<---
> diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
> index fd6b5e17f6c4..87439d7f965d 100644
> --- a/net/unix/af_unix.c
> +++ b/net/unix/af_unix.c
> @@ -1971,7 +1971,8 @@ static void unix_maybe_add_creds(struct sk_buff *skb, const struct sock *sk,
>   	if (UNIXCB(skb).pid)
>   		return;
>   
> -	if (unix_may_passcred(sk) || unix_may_passcred(other)) {
> +	if (unix_may_passcred(sk) || unix_may_passcred(other) ||
> +	    !other->sk_socket) {
>   		UNIXCB(skb).pid = get_pid(task_tgid(current));
>   		current_uid_gid(&UNIXCB(skb).uid, &UNIXCB(skb).gid);
>   	}
> ---8<---

I confirm that this fixes 6.16-rc1 for me as well. Whenever you send the 
proper patch please CC me so I can give a Tested-by tag.

Thanks!
	André