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From: Lorenz Bauer <lmb@cloudflare.com>
To: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Jakub Sitnicki <jakub@cloudflare.com>
Cc: kernel-team@cloudflare.com, Lorenz Bauer <lmb@cloudflare.com>,
	netdev@vger.kernel.org, bpf@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH bpf 1/2] flow_dissector: reject invalid attach_flags
Date: Fri, 12 Jun 2020 17:01:40 +0100	[thread overview]
Message-ID: <20200612160141.188370-1-lmb@cloudflare.com> (raw)

Using BPF_PROG_ATTACH on a flow dissector program supports neither flags
nor target_fd but accepts any value. Return EINVAL if either are non-zero.

Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Fixes: b27f7bb590ba ("flow_dissector: Move out netns_bpf prog callbacks")
---
 kernel/bpf/net_namespace.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/bpf/net_namespace.c b/kernel/bpf/net_namespace.c
index 78cf061f8179..56133e78ae4f 100644
--- a/kernel/bpf/net_namespace.c
+++ b/kernel/bpf/net_namespace.c
@@ -192,6 +192,9 @@ int netns_bpf_prog_attach(const union bpf_attr *attr, struct bpf_prog *prog)
 	struct net *net;
 	int ret;
 
+	if (attr->attach_flags || attr->target_fd)
+		return -EINVAL;
+
 	type = to_netns_bpf_attach_type(attr->attach_type);
 	if (type < 0)
 		return -EINVAL;
-- 
2.25.1


             reply	other threads:[~2020-06-12 16:02 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-12 16:01 Lorenz Bauer [this message]
2020-06-12 16:01 ` [PATCH bpf 2/2] bpf: sockmap: reject invalid attach_flags Lorenz Bauer
2020-06-12 22:35 ` [PATCH bpf 1/2] flow_dissector: " Alexei Starovoitov
2020-06-15 14:43   ` Lorenz Bauer
2020-06-16  3:55     ` Alexei Starovoitov
2020-06-16  8:30       ` Lorenz Bauer
2020-06-16 20:37         ` Alexei Starovoitov
2020-06-17  6:49           ` John Fastabend
2020-06-23 17:07             ` Lorenz Bauer

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