From: Christoph Hellwig <hch@lst.de>
To: Alexei Starovoitov <ast@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>,
netdev@vger.kernel.org, bpf@vger.kernel.org
Subject: how is the bpfilter sockopt processing supposed to work
Date: Fri, 17 Jul 2020 07:52:45 +0200 [thread overview]
Message-ID: <20200717055245.GA9577@lst.de> (raw)
Hi Alexei,
I've just been auditing the sockopt code, and bpfilter looks really
odd. Both getsockopts and setsockopt eventually end up
in__bpfilter_process_sockopt, which then passes record to the
userspace helper containing the address of the optval buffer.
Which depending on bpf-cgroup might be in user or kernel space.
But even if it is in userspace it would be in a different process
than the bpfiler helper. What makes all this work?
next reply other threads:[~2020-07-17 5:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-17 5:52 Christoph Hellwig [this message]
2020-07-17 16:13 ` how is the bpfilter sockopt processing supposed to work Alexei Starovoitov
2020-07-17 16:25 ` Christoph Hellwig
2020-07-17 17:28 ` Alexei Starovoitov
2020-07-20 8:25 ` David Laight
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