From: Paul Moore <paul@paul-moore.com>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: linux-audit@redhat.com, Jiri Olsa <jolsa@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Alexei Starovoitov <ast@kernel.org>,
Network Development <netdev@vger.kernel.org>,
bpf <bpf@vger.kernel.org>, Andrii Nakryiko <andriin@fb.com>,
Yonghong Song <yhs@fb.com>, Martin KaFai Lau <kafai@fb.com>,
Jakub Kicinski <jakub.kicinski@netronome.com>,
Steve Grubb <sgrubb@redhat.com>, David Miller <davem@redhat.com>,
Eric Paris <eparis@redhat.com>, Jiri Benc <jbenc@redhat.com>
Subject: Re: [PATCH] bpf: emit audit messages upon successful prog load and unload
Date: Thu, 21 Nov 2019 19:36:29 -0500 [thread overview]
Message-ID: <CAHC9VhRihMi_d-p+ieXyuVBcGMs80SkypVxF4gLE_s45GKP0dg@mail.gmail.com> (raw)
In-Reply-To: <20191122002257.4hgui6pylpkmpwac@ast-mbp.dhcp.thefacebook.com>
On Thu, Nov 21, 2019 at 7:23 PM Alexei Starovoitov
<alexei.starovoitov@gmail.com> wrote:
> On Thu, Nov 21, 2019 at 06:41:31PM -0500, Paul Moore wrote:
> > On Wed, Nov 20, 2019 at 4:49 PM Alexei Starovoitov
> > <alexei.starovoitov@gmail.com> wrote:
> > > On Wed, Nov 20, 2019 at 1:46 PM Daniel Borkmann <daniel@iogearbox.net> wrote:
> > > > On 11/20/19 10:38 PM, Jiri Olsa wrote:
> > > > > From: Daniel Borkmann <daniel@iogearbox.net>
> > > > >
> > > > > Allow for audit messages to be emitted upon BPF program load and
> > > > > unload for having a timeline of events. The load itself is in
> > > > > syscall context, so additional info about the process initiating
> > > > > the BPF prog creation can be logged and later directly correlated
> > > > > to the unload event.
> > > > >
> > > > > The only info really needed from BPF side is the globally unique
> > > > > prog ID where then audit user space tooling can query / dump all
> > > > > info needed about the specific BPF program right upon load event
> > > > > and enrich the record, thus these changes needed here can be kept
> > > > > small and non-intrusive to the core.
> > > > >
> > > > > Raw example output:
> > > > >
> > > > > # auditctl -D
> > > > > # auditctl -a always,exit -F arch=x86_64 -S bpf
> > > > > # ausearch --start recent -m 1334
> > > > > [...]
> > > > > ----
> > > > > time->Wed Nov 20 12:45:51 2019
> > > > > type=PROCTITLE msg=audit(1574271951.590:8974): proctitle="./test_verifier"
> > > > > type=SYSCALL msg=audit(1574271951.590:8974): arch=c000003e syscall=321 success=yes exit=14 a0=5 a1=7ffe2d923e80 a2=78 a3=0 items=0 ppid=742 pid=949 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=2 comm="test_verifier" exe="/root/bpf-next/tools/testing/selftests/bpf/test_verifier" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)
> > > > > type=UNKNOWN[1334] msg=audit(1574271951.590:8974): auid=0 uid=0 gid=0 ses=2 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 pid=949 comm="test_verifier" exe="/root/bpf-next/tools/testing/selftests/bpf/test_verifier" prog-id=3260 event=LOAD
> > > > > ----
> > > > > time->Wed Nov 20 12:45:51 2019
> > > > > type=UNKNOWN[1334] msg=audit(1574271951.590:8975): prog-id=3260 event=UNLOAD
> > > > > ----
> > > > > [...]
> > > > >
> > > > > Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
> > > > > Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> > > >
> > > > LGTM, thanks for the rebase!
> > >
> > > Applied to bpf-next. Thanks!
> >
> > [NOTE: added linux-audit to the To/CC line]
> >
> > Wait a minute, why was the linux-audit list not CC'd on this? Why are
> > you merging a patch into -next that adds to the uapi definition *and*
> > creates a new audit record while we are at -rc8?
> >
> > Aside from that I'm concerned that you are relying on audit userspace
> > changes that might not be okay; I see the PR below, but I don't see
> > any comment on it from Steve (it is his audit userspace). I also
> > don't see a corresponding test added to the audit-testsuite, which is
> > a common requirement for new audit functionality (link below). I'm
> > also fairly certain we don't want this new BPF record to look like how
> > you've coded it up in bpf_audit_prog(); duplicating the fields with
> > audit_log_task() is wrong, you've either already got them via an
> > associated record (which you get from passing non-NULL as the first
> > parameter to audit_log_start()), or you don't because there is no
> > associated syscall/task (which you get from passing NULL as the first
> > parameter). Please revert, un-merge, etc. this patch from bpf-next;
> > it should not go into Linus' tree as written.
>
> Sorry I didn't realize there was a disagreement.
>
> Dave, could you please revert it in net-next?
>
> > Audit userspace PR:
> > * https://github.com/linux-audit/audit-userspace/pull/104
>
> This PR does not use this new audit. It's doing everything via existing
> perf_event notification. My understanding of Jiri's email was that netlink
> style is preferred vs perf_event. Did I get it wrong?
Perhaps confusion on my part regarding the audit-userspace PR. The
commit description mentioned the audit userspace (the daemon most
likely) fetching additional info about the BPF program and this was
the only outstanding audit-userspace PR that had any mention of BPF.
However, getting back to netlink vs perf_event, if you want to
generate an audit record, it should happen via the audit subsystem
(and go up to the audit daemon via netlink).
--
paul moore
www.paul-moore.com
next prev parent reply other threads:[~2019-11-22 0:36 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-20 21:38 [PATCH] bpf: emit audit messages upon successful prog load and unload Jiri Olsa
2019-11-20 21:46 ` Daniel Borkmann
2019-11-20 21:48 ` Alexei Starovoitov
2019-11-21 23:41 ` Paul Moore
2019-11-22 0:22 ` Alexei Starovoitov
2019-11-22 0:36 ` Paul Moore [this message]
2019-11-22 19:23 ` Jiri Olsa
2019-11-22 21:19 ` Paul Moore
2019-11-23 8:57 ` Jiri Olsa
2019-11-23 18:03 ` Jakub Kicinski
2019-11-24 22:38 ` Jiri Olsa
2019-11-25 18:38 ` Steve Grubb
2019-11-22 0:25 ` Daniel Borkmann
2019-11-22 0:42 ` Paul Moore
2019-11-22 9:32 ` Jiri Olsa
2019-11-22 9:35 ` Jiri Olsa
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=CAHC9VhRihMi_d-p+ieXyuVBcGMs80SkypVxF4gLE_s45GKP0dg@mail.gmail.com \
--to=paul@paul-moore.com \
--cc=alexei.starovoitov@gmail.com \
--cc=andriin@fb.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=davem@redhat.com \
--cc=eparis@redhat.com \
--cc=jakub.kicinski@netronome.com \
--cc=jbenc@redhat.com \
--cc=jolsa@kernel.org \
--cc=kafai@fb.com \
--cc=linux-audit@redhat.com \
--cc=netdev@vger.kernel.org \
--cc=sgrubb@redhat.com \
--cc=yhs@fb.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
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).