From: Stanislav Fomichev <sdf@google.com>
To: netdev@vger.kernel.org, bpf@vger.kernel.org
Cc: davem@davemloft.net, ast@kernel.org, daniel@iogearbox.net,
Stanislav Fomichev <sdf@google.com>,
Petar Penkov <ppenkov@google.com>
Subject: [PATCH bpf-next 0/2] bpf/flow_dissector: add mode to enforce global BPF flow dissector
Date: Wed, 2 Oct 2019 10:33:55 -0700 [thread overview]
Message-ID: <20191002173357.253643-1-sdf@google.com> (raw)
While having a per-net-ns flow dissector programs is convenient for
testing, security-wise it's better to have only one vetted global
flow dissector implementation.
Let's have a convention that when BPF flow dissector is installed
in the root namespace, child namespaces can't override it.
Note, that it's totally possible to attach flow_dissector programs
to several namespaces and then switch to a global one. In this case,
only the root one will trigger; users are still able to detach
flow_dissector programs from non-root namespaces.
Alternative solution might be something like a sysctl to enable
the global mode.
Cc: Petar Penkov <ppenkov@google.com>
Stanislav Fomichev (2):
bpf/flow_dissector: add mode to enforce global BPF flow dissector
selftests/bpf: add test for BPF flow dissector in the root namespace
Documentation/bpf/prog_flow_dissector.rst | 3 ++
net/core/flow_dissector.c | 11 ++++-
.../selftests/bpf/test_flow_dissector.sh | 48 ++++++++++++++++---
3 files changed, 55 insertions(+), 7 deletions(-)
--
2.23.0.444.g18eeb5a265-goog
next reply other threads:[~2019-10-02 17:34 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-02 17:33 Stanislav Fomichev [this message]
2019-10-02 17:33 ` [PATCH bpf-next 1/2] bpf/flow_dissector: add mode to enforce global BPF flow dissector Stanislav Fomichev
2019-10-02 20:57 ` Song Liu
2019-10-02 21:31 ` Stanislav Fomichev
2019-10-02 23:29 ` Andrii Nakryiko
2019-10-03 1:43 ` Stanislav Fomichev
2019-10-03 2:47 ` Andrii Nakryiko
2019-10-03 16:01 ` Stanislav Fomichev
2019-10-03 16:26 ` Andrii Nakryiko
2019-10-03 17:45 ` John Fastabend
2019-10-03 17:58 ` Stanislav Fomichev
2019-10-02 17:33 ` [PATCH bpf-next 2/2] selftests/bpf: add test for BPF flow dissector in the root namespace Stanislav Fomichev
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