netdev - Re: [PATCH v7 02/12] file: Export receive

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Date:   Thu, 20 May 2021 06:18:49 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Xie Yongji <xieyongji@...edance.com>
Cc:     mst@...hat.com, jasowang@...hat.com, stefanha@...hat.com,
        sgarzare@...hat.com, parav@...dia.com, hch@...radead.org,
        christian.brauner@...onical.com, rdunlap@...radead.org,
        willy@...radead.org, axboe@...nel.dk, bcrl@...ck.org,
        corbet@....net, mika.penttila@...tfour.com,
        dan.carpenter@...cle.com, joro@...tes.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 02/12] file: Export receive_fd() to modules

On Mon, May 17, 2021 at 05:55:03PM +0800, Xie Yongji wrote:
> Export receive_fd() so that some modules can use
> it to pass file descriptor between processes without
> missing any security stuffs.

Which tree is that against?  Because in mainline this won't even build, let
alone work.

> --- a/fs/file.c
> +++ b/fs/file.c
> @@ -1135,6 +1135,12 @@ int __receive_fd(int fd, struct file *file, int __user *ufd, unsigned int o_flag
>  	return new_fd;
>  }
>  
> +int receive_fd(struct file *file, unsigned int o_flags)
> +{
> +	return __receive_fd(-1, file, NULL, o_flags);
> +}
> +EXPORT_SYMBOL_GPL(receive_fd);

fs/file.c:1097:int __receive_fd(struct file *file, int __user *ufd, unsigned int o_flags)