Re: [PATCH v7 02/12] file: Export receive_fd() to modules

Al Viro
2021-05-20T06:19:26Z

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)