linux-kernel - Re: [PATCH ghak80 V1] audit: add syscall information to FEATURE

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Message-ID: <20180420174812.3sczwow3wg6alrcu@madcap2.tricolour.ca>
Date:   Fri, 20 Apr 2018 13:48:12 -0400
From:   Richard Guy Briggs <rgb@...hat.com>
To:     Paul Moore <paul@...l-moore.com>
Cc:     Linux-Audit Mailing List <linux-audit@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Eric Paris <eparis@...hat.com>, Steve Grubb <sgrubb@...hat.com>
Subject: Re: [PATCH ghak80 V1] audit: add syscall information to
 FEATURE_CHANGE records

On 2018-04-20 11:58, Paul Moore wrote:
> On Fri, Apr 20, 2018 at 9:46 AM, Richard Guy Briggs <rgb@...hat.com> wrote:
> > On 2018-04-17 18:06, Paul Moore wrote:
> >> On Wed, Apr 11, 2018 at 8:46 AM, Richard Guy Briggs <rgb@...hat.com> wrote:
> >> > Tie syscall information to FEATURE_CHANGE calls since it is a result of
> >> > user action.
> >> >
> >> > See: https://github.com/linux-audit/audit-kernel/issues/80
> >> >
> >> > Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
> >> > ---
> >> >  kernel/audit.c | 5 ++---
> >> >  1 file changed, 2 insertions(+), 3 deletions(-)
> >> >
> >> > diff --git a/kernel/audit.c b/kernel/audit.c
> >> > index 8da24ef..23f125b 100644
> >> > --- a/kernel/audit.c
> >> > +++ b/kernel/audit.c
> >> > @@ -1103,10 +1103,9 @@ static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature
> >> >  {
> >> >         struct audit_buffer *ab;
> >> >
> >> > -       if (audit_enabled == AUDIT_OFF)
> >> > +       if (!audit_enabled)
> >>
> >> Sooo, this is an unrelated style change, why?  Looking at the rest of
> >> kernel/audit.c we seem to use a mix of "(!x)" and "(x == 0/CONST)" so
> >> why are you adding noise to this patch?
> >
> > Ok, survey sez 25 instances of audit_enabled used as a boolean vs 7
> > instances where it could be used as a boolean where the expression is
> > made harder to read (in my opinion).  I thought it was worth changing to
> > read the same way most of the other instances I've been reviewing are
> > written.  There are only two where the non-boolean distiction with
> > AUDIT_LOCKED is required.
> 
> Thanks for the explanation.
> 
> While I still believe this patch, and connecting records in general,
> is the Right Thing To Do, I'm expecting there to be some hate mail on
> this issue and I would like to keep the patch as small and as
> straight-to-the-point as possible just so there is little confusion
> about what is changing.
> 
> Please respin this without the style change and I'll merge it as soon
> as I see it.  Alternatively, give me the "ok" and I'll merge the patch
> now and just drop the style change; after all we're talking about one
> line in a five line patch ;)

Go ahead and drop that style change line to simplify this patch and I'll
submit another patch to clean them all up at the same time (probably the
next time one of those changes).

> >> >                 return;
> >> > -
> >> > -       ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_FEATURE_CHANGE);
> >> > +       ab = audit_log_start(current->audit_context, GFP_KERNEL, AUDIT_FEATURE_CHANGE);
> >>
> >> This is the important part, and the Right Thing To Do.
> >>
> >> >         if (!ab)
> >> >                 return;
> >> >         audit_log_task_info(ab, current);
> 
> -- 
> paul moore
> www.paul-moore.com

- RGB

--
Richard Guy Briggs <rgb@...hat.com>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
Voice: +1.647.777.2635, Internal: (81) 32635