linux-kernel - Re: [PATCH 05/14] fs: don't allow kernel reads and writes without iter ops

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Message-ID: <20201001224051.GI3421308@ZenIV.linux.org.uk>
Date:   Thu, 1 Oct 2020 23:40:51 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Christoph Hellwig <hch@....de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Michael Ellerman <mpe@...erman.id.au>, x86@...nel.org,
        Alexey Dobriyan <adobriyan@...il.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 05/14] fs: don't allow kernel reads and writes without
 iter ops

On Thu, Oct 01, 2020 at 03:38:52PM -0700, Eric Biggers wrote:

>  	mutex_lock(&sbi->pipe_mutex);
>  	while (bytes) {
> -		wr = __kernel_write(file, data, bytes, NULL);
> +		wr = __kernel_write(file, data, bytes, &file->f_pos);

Better
	loff_t dummy = 0;
...
		wr = __kernel_write(file, data, bytes, &dummy);