linux-kernel - Re: [PATCH] lockdown: Allow unprivileged users to see lockdown status

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Message-ID: <20200511134230.GA2311339@dev.jcline.org>
Date:   Mon, 11 May 2020 09:42:30 -0400
From:   Jeremy Cline <jcline@...hat.com>
To:     James Morris <jmorris@...ei.org>
Cc:     "Serge E . Hallyn" <serge@...lyn.com>,
        Matthew Garrett <matthewgarrett@...gle.com>,
        David Howells <dhowells@...hat.com>,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, "Frank Ch . Eigler" <fche@...hat.com>
Subject: Re: [PATCH] lockdown: Allow unprivileged users to see lockdown status

On Sat, Feb 22, 2020 at 03:51:24AM +1100, James Morris wrote:
> On Thu, 20 Feb 2020, Jeremy Cline wrote:
> 
> > A number of userspace tools, such as systemtap, need a way to see the
> > current lockdown state so they can gracefully deal with the kernel being
> > locked down. The state is already exposed in
> > /sys/kernel/security/lockdown, but is only readable by root. Adjust the
> > permissions so unprivileged users can read the state.
> > 
> > Fixes: 000d388ed3bb ("security: Add a static lockdown policy LSM")
> > Cc: Frank Ch. Eigler <fche@...hat.com>
> > Signed-off-by: Jeremy Cline <jcline@...hat.com>
> 
> Looks fine to me, any objection from Matthew or others?
> 

Can we take resounding silence as no objections?

- Jeremy

> > ---
> >  security/lockdown/lockdown.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c
> > index 5a952617a0eb..87cbdc64d272 100644
> > --- a/security/lockdown/lockdown.c
> > +++ b/security/lockdown/lockdown.c
> > @@ -150,7 +150,7 @@ static int __init lockdown_secfs_init(void)
> >  {
> >  	struct dentry *dentry;
> >  
> > -	dentry = securityfs_create_file("lockdown", 0600, NULL, NULL,
> > +	dentry = securityfs_create_file("lockdown", 0644, NULL, NULL,
> >  					&lockdown_ops);
> >  	return PTR_ERR_OR_ZERO(dentry);
> >  }
> > 
> 
> -- 
> James Morris
> <jmorris@...ei.org>
>