linux-kernel - [PATCH bpf-next] bpf: lsm: Make BPF_LSM depend on BPF

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Date:   Mon, 30 Mar 2020 22:40:59 +0200
From:   KP Singh <kpsingh@...omium.org>
To:     linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH bpf-next] bpf: lsm: Make BPF_LSM depend on BPF_EVENTS

From: KP Singh <kpsingh@...gle.com>

LSM and tracing programs share their helpers with bpf_tracing_func_proto
which is only defined (in bpf_trace.c) when BPF_EVENTS is enabled.

Instead of adding __weak symbol, make BPF_LSM depend on
BPF_EVENTS so that both tracing and LSM programs can actually share
helpers.

Signed-off-by: KP Singh <kpsingh@...gle.com>
Reported-by: Randy Dunlap <rdunlap@...radead.org>
Fixes: fc611f47f218 ("bpf: Introduce BPF_PROG_TYPE_LSM")
---
 init/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/init/Kconfig b/init/Kconfig
index deae572d1927..7b7ea70e64ac 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1619,6 +1619,7 @@ config KALLSYMS_BASE_RELATIVE
 
 config BPF_LSM
 	bool "LSM Instrumentation with BPF"
+	depends on BPF_EVENTS
 	depends on BPF_SYSCALL
 	depends on SECURITY
 	depends on BPF_JIT
-- 
2.20.1