linux-kernel - Re: [PATCH] vfs: Move kernel_read_file() to fs/read

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Date:   Mon, 04 Mar 2019 11:49:16 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     David Howells <dhowells@...hat.com>
Cc:     viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vfs: Move kernel_read_file() to fs/read_write.c

On Mon, 2019-03-04 at 16:22 +0000, David Howells wrote:
> Mimi Zohar <zohar@...ux.ibm.com> wrote:
> 
> > > Move kernel_read_file() to fs/read_write.c and out of fs/exec.c as it's not
> > > actually used by anything in the execve subsystem.
> > 
> > All files being opened by the kernel should be calling one of these
> > helper routines.  Has that changed?
> 
> prepare_binprm() uses kernel_read() and has done since at least 2014.  The
> binfmt drivers also use kernel_read().
> 
> Since kernel_read_file() is used by a bunch of things that aren't exec, even
> if we switch exec to it, it should probably still go in fs/read_write.c since
> it seems generic.

Oh, commit bdd1d2d3d251 ("fs: fix kernel_read prototype") moved
kernel_read() to fs/read_write.c without moving the helpers.
 Definitely makes sense to move the helpers.  Please include a
reference to the commit in this patch. 

Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>