netdev - [PATCH,bpf-next 2/2] samples: bpf: fix syscall

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Date:   Sat, 23 Nov 2019 14:51:51 +0900
From:   "Daniel T. Lee" <danieltimlee@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH,bpf-next 2/2] samples: bpf: fix syscall_tp due to unused syscall

Currently, open() is called from the user program and it calls the syscall
'sys_openat', not the 'sys_open'. This leads to an error of the program
of user side, due to the fact that the counter maps are zero since no
function such 'sys_open' is called.

This commit adds the kernel bpf program which are attached to the
tracepoint 'sys_enter_openat' and 'sys_enter_openat'.

Signed-off-by: Daniel T. Lee <danieltimlee@...il.com>
---
 samples/bpf/syscall_tp_kern.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/samples/bpf/syscall_tp_kern.c b/samples/bpf/syscall_tp_kern.c
index 1d78819ffef1..4ea91b1d3e03 100644
--- a/samples/bpf/syscall_tp_kern.c
+++ b/samples/bpf/syscall_tp_kern.c
@@ -51,9 +51,23 @@ int trace_enter_open(struct syscalls_enter_open_args *ctx)
 	return 0;
 }
 
+SEC("tracepoint/syscalls/sys_enter_openat")
+int trace_enter_open_at(struct syscalls_enter_open_args *ctx)
+{
+	count((void *)&enter_open_map);
+	return 0;
+}
+
 SEC("tracepoint/syscalls/sys_exit_open")
 int trace_enter_exit(struct syscalls_exit_open_args *ctx)
 {
 	count((void *)&exit_open_map);
 	return 0;
 }
+
+SEC("tracepoint/syscalls/sys_exit_openat")
+int trace_enter_exit_at(struct syscalls_exit_open_args *ctx)
+{
+	count((void *)&exit_open_map);
+	return 0;
+}
-- 
2.24.0