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Date:   Tue, 7 Jul 2020 13:49:23 +0200
From:   Christian Brauner <christian.brauner@ubuntu.com>
To:     Kees Cook <keescook@chromium.org>
Cc:     linux-kernel@vger.kernel.org, Sargun Dhillon <sargun@sargun.me>,
        Christian Brauner <christian@brauner.io>,
        Tycho Andersen <tycho@tycho.ws>,
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Subject: Re: [PATCH v6 3/7] fs: Add receive_fd() wrapper for __receive_fd()
Message-ID: <20200707114923.6huxnb4e5vkl657a@wittgenstein>
References: <20200706201720.3482959-1-keescook@chromium.org>
 <20200706201720.3482959-4-keescook@chromium.org>
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On Mon, Jul 06, 2020 at 01:17:16PM -0700, Kees Cook wrote:
> For both pidfd and seccomp, the __user pointer is not used. Update
> __receive_fd() to make writing to ufd optional via a NULL check. However,
> for the receive_fd_user() wrapper, ufd is NULL checked so an -EFAULT
> can be returned to avoid changing the SCM_RIGHTS interface behavior. Add
> new wrapper receive_fd() for pidfd and seccomp that does not use the ufd
> argument. For the new helper, the allocated fd needs to be returned on
> success. Update the existing callers to handle it.
> 
> Reviewed-by: Sargun Dhillon <sargun@sargun.me>
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---

Hm, I'm not sure why 2/7 and 3/7 aren't just one patch but ok. :)
Acked-by: Christian Brauner <christian.brauner@ubuntu.com>