Linux-audit Archive on lore.kernel.org
 help / color / Atom feed
From: Paul Moore <paul@paul-moore.com>
To: Richard Guy Briggs <rgb@redhat.com>
Cc: nhorman@tuxdriver.com, linux-api@vger.kernel.org,
	containers@lists.linux-foundation.org,
	LKML <linux-kernel@vger.kernel.org>,
	dhowells@redhat.com,
	Linux-Audit Mailing List <linux-audit@redhat.com>,
	netfilter-devel@vger.kernel.org, ebiederm@xmission.com,
	simo@redhat.com, netdev@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, Eric Paris <eparis@parisplace.org>,
	mpatel@redhat.com, Serge Hallyn <serge@hallyn.com>
Subject: Re: [PATCH ghak90 V9 07/13] audit: add support for non-syscall auxiliary records
Date: Sun, 5 Jul 2020 11:11:00 -0400
Message-ID: <CAHC9VhTEkhZqkH24hPEZgMtWcYy9qKhZdoiegDLhGefa_bxmuw@mail.gmail.com> (raw)
In-Reply-To: <21e6c4e1ac179c8dcf35803e603899ccfc69300a.1593198710.git.rgb@redhat.com>

On Sat, Jun 27, 2020 at 9:22 AM Richard Guy Briggs <rgb@redhat.com> wrote:
>
> Standalone audit records have the timestamp and serial number generated
> on the fly and as such are unique, making them standalone.  This new
> function audit_alloc_local() generates a local audit context that will
> be used only for a standalone record and its auxiliary record(s).  The
> context is discarded immediately after the local associated records are
> produced.

We've had some good discussions on the list about why we can't reuse
the "in_syscall" field and need to add a "local" field, I think it
would be good to address that here in the commit description.

> Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
> Acked-by: Serge Hallyn <serge@hallyn.com>
> Acked-by: Neil Horman <nhorman@tuxdriver.com>
> Reviewed-by: Ondrej Mosnacek <omosnace@redhat.com>
> ---
>  include/linux/audit.h |  8 ++++++++
>  kernel/audit.h        |  1 +
>  kernel/auditsc.c      | 33 ++++++++++++++++++++++++++++-----
>  3 files changed, 37 insertions(+), 5 deletions(-)

...

> diff --git a/kernel/auditsc.c b/kernel/auditsc.c
> index 9e79645e5c0e..935eb3d2cde9 100644
> --- a/kernel/auditsc.c
> +++ b/kernel/auditsc.c
> @@ -908,11 +908,13 @@ static inline void audit_free_aux(struct audit_context *context)
>         }
>  }
>
> -static inline struct audit_context *audit_alloc_context(enum audit_state state)
> +static inline struct audit_context *audit_alloc_context(enum audit_state state,
> +                                                       gfp_t gfpflags)
>  {
>         struct audit_context *context;
>
> -       context = kzalloc(sizeof(*context), GFP_KERNEL);
> +       /* We can be called in atomic context via audit_tg() */

At this point I think it's clear we need a respin so I'm not going to
preface all of my nitpick comments as such, although this definitely
would qualify ...

I don't believe audit_tg() doesn't exist yet, likely coming later in
this patchset, so please remove this comment as it doesn't make sense
in this context.

To be frank, don't re-add the comment later in the patchset either.
Comments like these tend to be fragile and don't really add any great
insight.  The audit_tg() function can, and most likely will, be
modified at some point in the future such that the comment above no
longer applies, and there is a reasonable chance that when it does the
above comment will not be updated.  Further, anyone modifying the
audit_alloc_context() is going to look at the callers (rather they
*should* look at the callers) and will notice the no-sleep
requirements.

> @@ -960,8 +963,27 @@ int audit_alloc_syscall(struct task_struct *tsk)
>         return 0;
>  }
>
> -static inline void audit_free_context(struct audit_context *context)
> +struct audit_context *audit_alloc_local(gfp_t gfpflags)
>  {
> +       struct audit_context *context = NULL;
> +
> +       context = audit_alloc_context(AUDIT_RECORD_CONTEXT, gfpflags);
> +       if (!context) {
> +               audit_log_lost("out of memory in audit_alloc_local");
> +               goto out;

You might as well just return NULL here, no need to jump and then return NULL.


> +       }
> +       context->serial = audit_serial();
> +       ktime_get_coarse_real_ts64(&context->ctime);
> +       context->local = true;
> +out:
> +       return context;
> +}
> +EXPORT_SYMBOL(audit_alloc_local);

--
paul moore
www.paul-moore.com

--
Linux-audit mailing list
Linux-audit@redhat.com
https://www.redhat.com/mailman/listinfo/linux-audit


  reply index

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-27 13:20 [PATCH ghak90 V9 00/13] audit: implement container identifier Richard Guy Briggs
2020-06-27 13:20 ` [PATCH ghak90 V9 01/13] audit: collect audit task parameters Richard Guy Briggs
2020-07-05 15:09   ` Paul Moore
2020-07-07  2:50     ` Richard Guy Briggs
2020-07-08  1:42       ` Paul Moore
2020-07-13 20:29         ` Richard Guy Briggs
2020-07-14  0:44           ` Paul Moore
2020-06-27 13:20 ` [PATCH ghak90 V9 02/13] audit: add container id Richard Guy Briggs
2020-07-04 13:29   ` Paul Moore
2020-07-04 13:30     ` Paul Moore
2020-07-05 15:09   ` Paul Moore
2020-07-29 20:05     ` Richard Guy Briggs
2020-08-21 19:36       ` Paul Moore
2020-06-27 13:20 ` [PATCH ghak90 V9 03/13] audit: read container ID of a process Richard Guy Briggs
2020-06-27 13:20 ` [PATCH ghak90 V9 04/13] audit: log drop of contid on exit of last task Richard Guy Briggs
2020-07-05 15:10   ` Paul Moore
2020-06-27 13:20 ` [PATCH ghak90 V9 05/13] audit: log container info of syscalls Richard Guy Briggs
2020-07-05 15:10   ` Paul Moore
2020-07-29 19:40     ` Richard Guy Briggs
2020-08-21 19:15       ` Paul Moore
2020-10-02 19:52         ` Richard Guy Briggs
2020-10-21 16:39           ` Richard Guy Briggs
2020-10-21 16:49             ` Steve Grubb
2020-10-21 17:53               ` Richard Guy Briggs
2020-10-23  1:21             ` Paul Moore
2020-10-23 20:40               ` Richard Guy Briggs
2020-10-28  1:35                 ` Paul Moore
2020-06-27 13:20 ` [PATCH ghak90 V9 06/13] audit: add contid support for signalling the audit daemon Richard Guy Briggs
2020-07-05 15:10   ` Paul Moore
2020-07-29 19:00     ` Richard Guy Briggs
2020-08-21 18:48       ` Paul Moore
2020-10-02 19:25         ` Richard Guy Briggs
2020-06-27 13:20 ` [PATCH ghak90 V9 07/13] audit: add support for non-syscall auxiliary records Richard Guy Briggs
2020-07-05 15:11   ` Paul Moore [this message]
2020-06-27 13:20 ` [PATCH ghak90 V9 08/13] audit: add containerid support for user records Richard Guy Briggs
2020-07-05 15:11   ` Paul Moore
2020-07-18  0:43     ` Richard Guy Briggs
2020-08-21 18:34       ` Paul Moore
2020-06-27 13:20 ` [PATCH ghak90 V9 09/13] audit: add containerid filtering Richard Guy Briggs
2020-06-27 13:20 ` [PATCH ghak90 V9 10/13] audit: add support for containerid to network namespaces Richard Guy Briggs
2020-07-05 15:11   ` Paul Moore
2020-07-21 22:05     ` Richard Guy Briggs
2020-06-27 13:20 ` [PATCH ghak90 V9 11/13] audit: contid check descendancy and nesting Richard Guy Briggs
2020-07-05 15:11   ` Paul Moore
2020-08-07 17:10     ` Richard Guy Briggs
2020-08-21 20:13       ` Paul Moore
2020-10-06 20:03         ` Richard Guy Briggs
2020-06-27 13:20 ` [PATCH ghak90 V9 12/13] audit: track container nesting Richard Guy Briggs
2020-07-05 15:11   ` Paul Moore
2020-06-27 13:20 ` [PATCH ghak90 V9 13/13] audit: add capcontid to set contid outside init_user_ns Richard Guy Briggs
2020-07-05 15:11   ` Paul Moore

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CAHC9VhTEkhZqkH24hPEZgMtWcYy9qKhZdoiegDLhGefa_bxmuw@mail.gmail.com \
    --to=paul@paul-moore.com \
    --cc=containers@lists.linux-foundation.org \
    --cc=dhowells@redhat.com \
    --cc=ebiederm@xmission.com \
    --cc=eparis@parisplace.org \
    --cc=linux-api@vger.kernel.org \
    --cc=linux-audit@redhat.com \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mpatel@redhat.com \
    --cc=netdev@vger.kernel.org \
    --cc=netfilter-devel@vger.kernel.org \
    --cc=nhorman@tuxdriver.com \
    --cc=rgb@redhat.com \
    --cc=serge@hallyn.com \
    --cc=simo@redhat.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-audit Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-audit/0 linux-audit/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-audit linux-audit/ https://lore.kernel.org/linux-audit \
		linux-audit@redhat.com
	public-inbox-index linux-audit

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/com.redhat.linux-audit


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git