On 11/22/19 12:41 AM, Paul Moore wrote:
On Wed, Nov 20, 2019 at 4:49 PM Alexei Starovoitov
<alexei.starovoitov@xxxxxxxxx> wrote:
On Wed, Nov 20, 2019 at 1:46 PM Daniel Borkmann <daniel@xxxxxxxxxxxxx> wrote:
On 11/20/19 10:38 PM, Jiri Olsa wrote:
From: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
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.
Fair enough, up to you guys. My impression was that this is mainly coming
from RHEL use case [0] and given that the original patch was back in Oct
2018 [1] that you've sorted it out by now RH internally and agreed to proceed
with this patch for BPF given the rebase + resend ... seems not then. :(
The audit-userspace PR below is sitting there since August this year but
its for the perf event based approach and my understanding from Plumbers
conf was that the internal discussion was that a native integration was
needed hence the proposed resend now.
Given the change is mostly trivial, are there any major objections for Jiri
to follow-up? Otherwise worst case probably easier to revert in net-next.
Audit userspace PR:
* https://github.com/linux-audit/audit-userspace/pull/104
Audit test suite:
* https://github.com/linux-audit/audit-testsuite
Audit folks, here is a link to the thread in the archives:
* https://lore.kernel.org/bpf/20191120213816.8186-1-jolsa@xxxxxxxxxx/T/#u
Thanks,
Daniel
[0] slide 11, https://linuxplumbersconf.org/event/4/contributions/460/attachments/244/426/xdp-distro-view.pdf
[1] https://lore.kernel.org/netdev/20181004135038.2876-1-daniel@xxxxxxxxxxxxx/
