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

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Message-ID: <20200626122752.GN4332@42.do-not-panic.com>
Date:   Fri, 26 Jun 2020 12:27:52 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 8/9] fs: don't allow kernel reads and writes without iter
 ops

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