linux-kernel - Re: [PATCH] seccomp: Add SECCOMP_CLONE

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Message-ID: <CAADnVQLve3KgrqNqSqVrmL-wz6Jj1QUdjAcE5P26Z4wvh9e4HA@mail.gmail.com>
Date: Wed, 3 Sep 2025 13:45:16 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Tom Hromatka <tom.hromatka@...cle.com>
Cc: Kees Cook <kees@...nel.org>, Andy Lutomirski <luto@...capital.net>, Will Drewry <wad@...omium.org>, 
	Sargun Dhillon <sargun@...gun.me>, Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>, 
	Christian Brauner <brauner@...nel.org>, "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>, 
	LKML <linux-kernel@...r.kernel.org>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH] seccomp: Add SECCOMP_CLONE_FILTER operation

On Wed, Sep 3, 2025 at 1:38 PM Tom Hromatka <tom.hromatka@...cle.com> wrote:
>
> +
> +       spin_lock_irq(&current->sighand->siglock);
> +       spin_lock_irq(&task->sighand->siglock);
> +
> +       if (atomic_read(&task->seccomp.filter_count) == 0) {
> +               spin_unlock_irq(&task->sighand->siglock);
> +               spin_unlock_irq(&current->sighand->siglock);

did you copy this pattern from somewhere ?
It's obviously buggy.