linux-kernel - Re: [PATCH RESEND 3/5] selftests/seccomp: Add test for wait killable notifier

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Date:   Mon, 26 Apr 2021 12:51:38 -0600
From:   Tycho Andersen <tycho@...ho.pizza>
To:     Sargun Dhillon <sargun@...gun.me>
Cc:     Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        Rodrigo Campos <rodrigo@...volk.io>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Mauricio Vásquez Bernal 
        <mauricio@...volk.io>, Giuseppe Scrivano <gscrivan@...hat.com>,
        Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>, Alban Crequy <alban@...volk.io>
Subject: Re: [PATCH RESEND 3/5] selftests/seccomp: Add test for wait killable
 notifier

On Mon, Apr 26, 2021 at 11:06:08AM -0700, Sargun Dhillon wrote:
> +TEST(user_notification_signal_wait_killable)
> +{
> +	pid_t pid;
> +	long ret;
> +	int status, listener, sk_pair[2];
> +	struct seccomp_notif req = {
> +		.flags = SECCOMP_USER_NOTIF_FLAG_WAIT_KILLABLE,
> +	};
> +	struct seccomp_notif_resp resp = {};
> +	char c;
> +
> +	ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
> +	ASSERT_EQ(0, ret) {
> +		TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
> +	}
> +
> +	ASSERT_EQ(socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, sk_pair), 0);
> +	ASSERT_EQ(fcntl(sk_pair[0], F_SETFL, O_NONBLOCK), 0);
> +
> +	listener = user_notif_syscall(__NR_gettid,
> +				      SECCOMP_FILTER_FLAG_NEW_LISTENER);
> +	ASSERT_GE(listener, 0);
> +
> +	pid = fork();
> +	ASSERT_GE(pid, 0);
> +
> +	if (pid == 0) {
> +		close(sk_pair[0]);
> +		handled = sk_pair[1];
> +		if (signal(SIGUSR1, signal_handler) == SIG_ERR) {

I think here you want a write(handled, "x", 1), right?

Tycho