netdev - Re: [PATCH] bpf: emit audit messages upon successful prog load and unload

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Message-ID: <8c928ec4-9e43-3e2a-7005-21f40fcca061@iogearbox.net>
Date:   Wed, 20 Nov 2019 22:46:43 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        Andrii Nakryiko <andriin@...com>, Yonghong Song <yhs@...com>,
        Martin KaFai Lau <kafai@...com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Steve Grubb <sgrubb@...hat.com>,
        David Miller <davem@...hat.com>,
        Paul Moore <paul@...l-moore.com>,
        Eric Paris <eparis@...hat.com>, Jiri Benc <jbenc@...hat.com>
Subject: Re: [PATCH] bpf: emit audit messages upon successful prog load and
 unload

On 11/20/19 10:38 PM, Jiri Olsa wrote:
> From: Daniel Borkmann <daniel@...earbox.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@...earbox.net>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

LGTM, thanks for the rebase!