netdev - [PATCHv3 0/6] bpf: Add trampoline helpers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 21 Jan 2020 13:05:06 +0100
From:   Jiri Olsa <jolsa@...nel.org>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        Andrii Nakryiko <andriin@...com>, Yonghong Song <yhs@...com>,
        Martin KaFai Lau <kafai@...com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        David Miller <davem@...hat.com>,
        Björn Töpel <bjorn.topel@...el.com>,
        John Fastabend <john.fastabend@...il.com>
Subject: [PATCHv3 0/6] bpf: Add trampoline helpers

hi,
adding helpers for trampolines and 2 other fixes to have kernel
support for loading trampoline programs in bcc/bpftrace.

Original rfc post [1].

Speedup output of perf bench while running klockstat.py
on kprobes vs trampolines:

    Without:
            $ perf bench sched messaging -l 50000
            ...
                 Total time: 18.571 [sec]

    With current kprobe tracing:
            $ perf bench sched messaging -l 50000
            ...
                 Total time: 183.395 [sec]

    With kfunc tracing:
            $ perf bench sched messaging -l 50000
            ...
                 Total time: 39.773 [sec]

v3 changes:
  - added ack from John Fastabend for patch 1
  - move out is_bpf_image_address from is_bpf_text_address call [David]

v2 changes:
  - make the unwind work for dispatcher as well
  - added test for allowed trampolines count
  - used raw tp pt_regs nest-arrays for trampoline helpers

thanks,
jirka


[1] https://lore.kernel.org/netdev/20191229143740.29143-1-jolsa@kernel.org/
---
Jiri Olsa (6):
      bpf: Allow ctx access for pointers to scalar
      bpf: Add bpf_perf_event_output_kfunc
      bpf: Add bpf_get_stackid_kfunc
      bpf: Add bpf_get_stack_kfunc
      bpf: Allow to resolve bpf trampoline and dispatcher in unwind
      selftest/bpf: Add test for allowed trampolines count

 include/linux/bpf.h                                       |  12 +++++++++++-
 kernel/bpf/btf.c                                          |  13 ++++++++++++-
 kernel/bpf/dispatcher.c                                   |   4 ++--
 kernel/bpf/trampoline.c                                   |  82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------
 kernel/extable.c                                          |   7 +++++--
 kernel/trace/bpf_trace.c                                  |  96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/testing/selftests/bpf/prog_tests/trampoline_count.c | 112 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/testing/selftests/bpf/progs/test_trampoline_count.c |  21 +++++++++++++++++++++
 8 files changed, 334 insertions(+), 13 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/trampoline_count.c
 create mode 100644 tools/testing/selftests/bpf/progs/test_trampoline_count.c