linux-kernel - Re: [PATCH] tracefs: Annotate tracefs_ops with __ro_after

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Date:   Tue, 24 Jul 2018 18:39:30 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Zubin Mithra <zsm@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Guenter Roeck <groeck@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] tracefs: Annotate tracefs_ops with __ro_after_init

On Tue, 24 Jul 2018 15:07:18 -0700
Kees Cook <keescook@...omium.org> wrote:

> Adding Steven (maintainer) and Al (fs) to CC...

Thanks, first I've seen of this.

> 
> On Tue, Jul 24, 2018 at 1:02 PM, Zubin Mithra <zsm@...omium.org> wrote:
> > tracefs_ops is initialized inside tracefs_create_instance_dir and not
> > modified after. tracefs_create_instance_dir allows for initialization
> > only once, and is called from create_trace_instances(marked __init),
> > which is called from tracer_init_tracefs(marked __init).

Then, especially with this change, we should mark
tracefs_create_instance_dir() as init, as it would fail any other time.

> >
> > Signed-off-by: Zubin Mithra <zsm@...omium.org>
> > Reviewed-by: Kees Cook <keescook@...omium.org>  
> 
> Who's tree should this go through?

I can take it or someone else can, and I'll ack it if need be.

-- Steve


> 
> Thanks!
> 
> -Kees
> 
> > ---
> >  fs/tracefs/inode.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/fs/tracefs/inode.c b/fs/tracefs/inode.c
> > index bea8ad876bf9..20e965873f27 100644
> > --- a/fs/tracefs/inode.c
> > +++ b/fs/tracefs/inode.c
> > @@ -53,7 +53,7 @@ static const struct file_operations tracefs_file_operations = {
> >  static struct tracefs_dir_ops {
> >         int (*mkdir)(const char *name);
> >         int (*rmdir)(const char *name);
> > -} tracefs_ops;
> > +} tracefs_ops __ro_after_init;
> >
> >  static char *get_dname(struct dentry *dentry)
> >  {
> > --
> > 2.18.0.233.g985f88cf7e-goog
> >  
> 
> 
>