linux-kernel - Re: [PATCH V4 (was V6)] audit: use macros for unset inode and device values

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Message-ID: <32702596.GifTzGnU6n@x2>
Date:	Wed, 05 Aug 2015 16:08:23 -0400
From:	Steve Grubb <sgrubb@...hat.com>
To:	Paul Moore <pmoore@...hat.com>
Cc:	Richard Guy Briggs <rgb@...hat.com>, linux-audit@...hat.com,
	linux-kernel@...r.kernel.org, eparis@...hat.com
Subject: Re: [PATCH V4 (was V6)] audit: use macros for unset inode and device values

On Wednesday, August 05, 2015 03:16:58 PM Paul Moore wrote:
> On Wednesday, August 05, 2015 02:30:14 AM Richard Guy Briggs wrote:
> > On 15/08/04, Paul Moore wrote:
> > > On Saturday, August 01, 2015 03:42:23 PM Richard Guy Briggs wrote:
> > > > Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> > > > ---
> > > > 
> > > >  include/uapi/linux/audit.h |    2 ++
> > > >  kernel/audit.c             |    2 +-
> > > >  kernel/audit_watch.c       |    8 ++++----
> > > >  kernel/auditsc.c           |    6 +++---
> > > >  4 files changed, 10 insertions(+), 8 deletions(-)
> > > 
> > > Yipee, less magic numbers!
> > > 
> > > However, one question for you ... are we ever going to see a device or
> > > inode set to -1 in the userspace facing API?  In other words, should the
> > > new #defines go in the uapi headers or simply in kernel/audit.h?  Unless
> > > it is part of the API, let's leave it out of uapi as we have to be very
> > > careful about that stuff and I'd prefer to keep it minimal.
> > 
> > This is a good point.  I did briefly thing about this at one point.
> > Perhaps Steve can answer this.  It would be trivial to move it back to
> > uapi if needed.  Would you be ok with it in include/linux/audit.h for
> > now?
> 
> I have no problem with it in include/linux/audit.h, that is a kernel-only
> include that we can change at anytime.  My concern is putting it into a uapi
> header which makes it very hard to change.
> 
> I'm thinking we should just go ahead and put it in include/linux/audit.h for
> now as I can't think of a reason why userspace should be passing in an
> invalid dev/inode value, it just doesn't make sense.  If the invalid tokens
> prove to be valuable for userspace, we can always move the #defines.

I can't imagine anyone auditing against a specific device or inode. Its like 
auditing a pid when you really want the program name. Its much more useful to 
audit by filename or directory and not inode/device. So, do whatever you want. 
The only unset value that people actually use is the auid because deamons have 
it unset.

-Steve
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