netdev - [PATCH net-next v4 0/2] bpf: add support for sys_{enter|exit}

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Date:   Fri, 4 Aug 2017 16:00:08 -0700
From:   Yonghong Song <yhs@...com>
To:     <peterz@...radead.org>, <rostedt@...dmis.org>, <ast@...com>,
        <daniel@...earbox.net>, <netdev@...r.kernel.org>
CC:     <kernel-team@...com>
Subject: [PATCH net-next v4 0/2] bpf: add support for sys_{enter|exit}_* tracepoints

Currently, bpf programs cannot be attached to sys_enter_* and sys_exit_*
style tracepoints. The main reason is that syscalls/sys_enter_* and syscalls/sys_exit_*
tracepoints are treated differently from other tracepoints and there
is no bpf hook to it.

This patch set adds bpf support for these syscalls tracepoints and also
adds a test case for it.

Changelogs:
v3 -> v4:
 - Check the legality of ctx offset access for syscall tracepoint as well.
   trace_event_get_offsets will return correct max offset for each
   specific syscall tracepoint.
 - Use variable length array to avoid hardcode 6 as the maximum
   arguments beyond syscall_nr.
v2 -> v3:
 - Fix a build issue
v1 -> v2:
 - Do not use TRACE_EVENT_FL_CAP_ANY to identify syscall tracepoint.
   Instead use trace_event_call->class.

Yonghong Song (2):
  bpf: add support for sys_enter_* and sys_exit_* tracepoints
  bpf: add a test case for syscalls/sys_{enter|exit}_* tracepoints

 include/linux/syscalls.h      | 12 ++++++++
 kernel/events/core.c          | 10 +++---
 kernel/trace/trace_syscalls.c | 53 ++++++++++++++++++++++++++++++--
 samples/bpf/Makefile          |  4 +++
 samples/bpf/syscall_tp_kern.c | 62 +++++++++++++++++++++++++++++++++++++
 samples/bpf/syscall_tp_user.c | 71 +++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 206 insertions(+), 6 deletions(-)
 create mode 100644 samples/bpf/syscall_tp_kern.c
 create mode 100644 samples/bpf/syscall_tp_user.c

-- 
2.9.4