netdev - [PATCH] bpf: Use tracing helpers for lsm programs

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Date:   Sun, 31 May 2020 17:42:55 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     KP Singh <kpsingh@...gle.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Yonghong Song <yhs@...com>,
        Martin KaFai Lau <kafai@...com>,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Andrii Nakryiko <andriin@...com>,
        KP Singh <kpsingh@...omium.org>
Subject: [PATCH] bpf: Use tracing helpers for lsm programs

Currenty lsm uses bpf_tracing_func_proto helpers which do
not include stack trace or perf event output. It's useful
to have those for bpftrace lsm support [1].

Using tracing_prog_func_proto helpers for lsm programs.

[1] https://github.com/iovisor/bpftrace/pull/1347

Cc: KP Singh <kpsingh@...gle.com>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 include/linux/bpf.h      | 3 +++
 kernel/bpf/bpf_lsm.c     | 2 +-
 kernel/trace/bpf_trace.c | 2 +-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index e5884f7f801c..caa26ab471e8 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1628,6 +1628,9 @@ extern const struct bpf_func_proto bpf_ringbuf_query_proto;
 const struct bpf_func_proto *bpf_tracing_func_proto(
 	enum bpf_func_id func_id, const struct bpf_prog *prog);
 
+const struct bpf_func_proto *tracing_prog_func_proto(
+  enum bpf_func_id func_id, const struct bpf_prog *prog);
+
 /* Shared helpers among cBPF and eBPF. */
 void bpf_user_rnd_init_once(void);
 u64 bpf_user_rnd_u32(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c
index 19636703b24e..fb278144e9fd 100644
--- a/kernel/bpf/bpf_lsm.c
+++ b/kernel/bpf/bpf_lsm.c
@@ -49,6 +49,6 @@ const struct bpf_prog_ops lsm_prog_ops = {
 };
 
 const struct bpf_verifier_ops lsm_verifier_ops = {
-	.get_func_proto = bpf_tracing_func_proto,
+	.get_func_proto = tracing_prog_func_proto,
 	.is_valid_access = btf_ctx_access,
 };
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 3767d34114c0..794d665bebdd 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -1467,7 +1467,7 @@ raw_tp_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 	}
 }
 
-static const struct bpf_func_proto *
+const struct bpf_func_proto *
 tracing_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 {
 	switch (func_id) {
-- 
2.25.4