linux-kernel - Re: [PATCH 1/2] seccomp: notify user trap about unused filter

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Message-ID: <20200527152559.GB4153131@cisco>
Date:   Wed, 27 May 2020 09:25:59 -0600
From:   Tycho Andersen <tycho@...ho.ws>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Andy Lutomirski <luto@...nel.org>,
        Matt Denton <mpdenton@...gle.com>,
        Sargun Dhillon <sargun@...gun.me>,
        Jann Horn <jannh@...gle.com>, Chris Palmer <palmer@...gle.com>,
        Aleksa Sarai <cyphar@...har.com>,
        Robert Sesek <rsesek@...gle.com>,
        Jeffrey Vander Stoep <jeffv@...gle.com>,
        Linux Containers <containers@...ts.linux-foundation.org>
Subject: Re: [PATCH 1/2] seccomp: notify user trap about unused filter

On Wed, May 27, 2020 at 01:19:01PM +0200, Christian Brauner wrote:
> +void seccomp_filter_notify(const struct task_struct *tsk)
> +{
> +	struct seccomp_filter *orig = tsk->seccomp.filter;
> +
> +	while (orig && refcount_dec_and_test(&orig->live)) {
> +		if (waitqueue_active(&orig->wqh))
> +			wake_up_poll(&orig->wqh, EPOLLHUP);
> +		orig = orig->prev;
> +	}
> +}

Is there a reason this can't live in put_seccomp_filter()?

Tycho