[RFC PATCH ghak32 V2 07/13] audit: add container aux record to watch/tree/mark

Richard Guy Briggs rgb at redhat.com
Thu Apr 19 12:24:45 UTC 2018


On 2018-04-18 20:42, Paul Moore wrote:
> On Fri, Mar 16, 2018 at 5:00 AM, Richard Guy Briggs <rgb at redhat.com> wrote:
> > Add container ID auxiliary record to mark, watch and tree rule
> > configuration standalone records.
> >
> > Signed-off-by: Richard Guy Briggs <rgb at redhat.com>
> > ---
> >  kernel/audit_fsnotify.c |  5 ++++-
> >  kernel/audit_tree.c     |  5 ++++-
> >  kernel/audit_watch.c    | 33 +++++++++++++++++++--------------
> >  3 files changed, 27 insertions(+), 16 deletions(-)
> >
> > diff --git a/kernel/audit_fsnotify.c b/kernel/audit_fsnotify.c
> > index 52f368b..18c110d 100644
> > --- a/kernel/audit_fsnotify.c
> > +++ b/kernel/audit_fsnotify.c
> > @@ -124,10 +124,11 @@ static void audit_mark_log_rule_change(struct audit_fsnotify_mark *audit_mark, c
> >  {
> >         struct audit_buffer *ab;
> >         struct audit_krule *rule = audit_mark->rule;
> > +       struct audit_context *context = audit_alloc_local();
> >
> >         if (!audit_enabled)
> >                 return;
> 
> Move the audit_alloc_local() after the audit_enabled check.

Already fixed in V3 as previously warned, by making all
AUDIT_CONFIG_CHANGE records SYSCALL auxiliary records.

> > -       ab = audit_log_start(NULL, GFP_NOFS, AUDIT_CONFIG_CHANGE);
> > +       ab = audit_log_start(context, GFP_NOFS, AUDIT_CONFIG_CHANGE);
> >         if (unlikely(!ab))
> >                 return;
> >         audit_log_format(ab, "auid=%u ses=%u op=%s",
> > @@ -138,6 +139,8 @@ static void audit_mark_log_rule_change(struct audit_fsnotify_mark *audit_mark, c
> >         audit_log_key(ab, rule->filterkey);
> >         audit_log_format(ab, " list=%d res=1", rule->listnr);
> >         audit_log_end(ab);
> > +       audit_log_container_info(context, "config", audit_get_containerid(current));
> > +       audit_free_context(context);
> >  }
> >
> >  void audit_remove_mark(struct audit_fsnotify_mark *audit_mark)
> > diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
> > index 67e6956..7c085be 100644
> > --- a/kernel/audit_tree.c
> > +++ b/kernel/audit_tree.c
> > @@ -496,8 +496,9 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
> >  static void audit_tree_log_remove_rule(struct audit_krule *rule)
> >  {
> >         struct audit_buffer *ab;
> > +       struct audit_context *context = audit_alloc_local();
> 
> Sort of independent of the audit container ID work, but shouldn't we
> have an audit_enabled check here?

Same.

> > -       ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
> > +       ab = audit_log_start(context, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
> >         if (unlikely(!ab))
> >                 return;
> >         audit_log_format(ab, "op=remove_rule");
> > @@ -506,6 +507,8 @@ static void audit_tree_log_remove_rule(struct audit_krule *rule)
> >         audit_log_key(ab, rule->filterkey);
> >         audit_log_format(ab, " list=%d res=1", rule->listnr);
> >         audit_log_end(ab);
> > +       audit_log_container_info(context, "config", audit_get_containerid(current));
> > +       audit_free_context(context);
> >  }
> >
> >  static void kill_rules(struct audit_tree *tree)
> > diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
> > index 9eb8b35..60d75a2 100644
> > --- a/kernel/audit_watch.c
> > +++ b/kernel/audit_watch.c
> > @@ -238,20 +238,25 @@ static struct audit_watch *audit_dupe_watch(struct audit_watch *old)
> >
> >  static void audit_watch_log_rule_change(struct audit_krule *r, struct audit_watch *w, char *op)
> >  {
> > -       if (audit_enabled) {
> > -               struct audit_buffer *ab;
> > -               ab = audit_log_start(NULL, GFP_NOFS, AUDIT_CONFIG_CHANGE);
> > -               if (unlikely(!ab))
> > -                       return;
> > -               audit_log_format(ab, "auid=%u ses=%u op=%s",
> > -                                from_kuid(&init_user_ns, audit_get_loginuid(current)),
> > -                                audit_get_sessionid(current), op);
> > -               audit_log_format(ab, " path=");
> > -               audit_log_untrustedstring(ab, w->path);
> > -               audit_log_key(ab, r->filterkey);
> > -               audit_log_format(ab, " list=%d res=1", r->listnr);
> > -               audit_log_end(ab);
> > -       }
> > +       struct audit_buffer *ab;
> > +       struct audit_context *context = audit_alloc_local();
> > +
> > +       if (!audit_enabled)
> > +               return;
> 
> Same as above, do the allocation after the audit_enabled check.

Same.

> > +       ab = audit_log_start(context, GFP_NOFS, AUDIT_CONFIG_CHANGE);
> > +       if (unlikely(!ab))
> > +               return;
> > +       audit_log_format(ab, "auid=%u ses=%u op=%s",
> > +                        from_kuid(&init_user_ns, audit_get_loginuid(current)),
> > +                        audit_get_sessionid(current), op);
> > +       audit_log_format(ab, " path=");
> > +       audit_log_untrustedstring(ab, w->path);
> > +       audit_log_key(ab, r->filterkey);
> > +       audit_log_format(ab, " list=%d res=1", r->listnr);
> > +       audit_log_end(ab);
> > +       audit_log_container_info(context, "config", audit_get_containerid(current));
> > +       audit_free_context(context);
> >  }
> 
> -- 
> paul moore
> www.paul-moore.com

- RGB

--
Richard Guy Briggs <rgb at redhat.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


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