Re: [PATCH 8/9] fs: don't allow kernel reads and writes without iter ops

[Luis Chamberlain]

On Fri, Jun 26, 2020 at 09:58:35AM +0200, Christoph Hellwig wrote:
> diff --git a/fs/read_write.c b/fs/read_write.c
> index e765c95ff3440d..ae463bcadb6906 100644
> --- a/fs/read_write.c
> +++ b/fs/read_write.c
> @@ -420,6 +420,18 @@ ssize_t iter_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos,
>  	return ret;
>  }
>  
> +static void warn_unsupported(struct file *file, const char *op)
> +{
> +	char pathname[128], *path;

Why 128? How about kstrdup_quotable_file()?

  Luis