From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org, Martin KaFai Lau <kafai@fb.com>,
Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@chromium.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Christoph Hellwig <hch@lst.de>,
Masami Hiramatsu <mhiramat@kernel.org>,
Martynas Pumputis <m@lambda.lt>
Subject: [PATCH bpf-next 0/8] bpf: Fixes for kprobe multi on kernel modules
Date: Sun, 9 Oct 2022 23:59:18 +0200 [thread overview]
Message-ID: <20221009215926.970164-1-jolsa@kernel.org> (raw)
hi,
Martynas reported kprobe _multi link does not resolve symbols
from kernel modules, which attach by address works.
In addition while fixing that I realized we do not take module
reference if the module has kprobe_multi link on top of it and
can be removed.
There's mo crash related to this, it will silently disappear from
ftrace tables, while kprobe_multi link stays up with no data.
This patchset has fixes for both issues.
thanks,
jirka
---
Jiri Olsa (8):
kallsyms: Make module_kallsyms_on_each_symbol generally available
ftrace: Add support to resolve module symbols in ftrace_lookup_symbols
bpf: Rename __bpf_kprobe_multi_cookie_cmp to bpf_kprobe_multi_addrs_cmp
bpf: Take module reference on kprobe_multi link
selftests/bpf: Add load_kallsyms_refresh function
selftests/bpf: Add bpf_testmod_fentry_* functions
selftests/bpf: Add kprobe_multi kmod link api tests
selftests/bpf: Add kprobe_multi check to module attach test
include/linux/module.h | 9 ++++++++
kernel/module/kallsyms.c | 2 --
kernel/trace/bpf_trace.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
kernel/trace/ftrace.c | 11 +++++----
tools/testing/selftests/bpf/bpf_testmod/bpf_testmod.c | 24 +++++++++++++++++++
tools/testing/selftests/bpf/prog_tests/kprobe_multi_testmod_test.c | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
tools/testing/selftests/bpf/prog_tests/module_attach.c | 7 ++++++
tools/testing/selftests/bpf/progs/kprobe_multi.c | 51 ++++++++++++++++++++++++++++++++++++++++
tools/testing/selftests/bpf/progs/test_module_attach.c | 6 +++++
tools/testing/selftests/bpf/trace_helpers.c | 20 ++++++++++------
tools/testing/selftests/bpf/trace_helpers.h | 2 ++
11 files changed, 315 insertions(+), 17 deletions(-)
create mode 100644 tools/testing/selftests/bpf/prog_tests/kprobe_multi_testmod_test.c
next reply other threads:[~2022-10-09 21:59 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-09 21:59 Jiri Olsa [this message]
2022-10-09 21:59 ` [PATCH bpf-next 1/8] kallsyms: Make module_kallsyms_on_each_symbol generally available Jiri Olsa
2022-10-11 6:56 ` Song Liu
2022-10-09 21:59 ` [PATCH bpf-next 2/8] ftrace: Add support to resolve module symbols in ftrace_lookup_symbols Jiri Olsa
2022-10-11 7:05 ` Song Liu
2022-10-11 10:07 ` Jiri Olsa
2022-10-09 21:59 ` [PATCH bpf-next 3/8] bpf: Rename __bpf_kprobe_multi_cookie_cmp to bpf_kprobe_multi_addrs_cmp Jiri Olsa
2022-10-11 7:06 ` Song Liu
2022-10-09 21:59 ` [PATCH bpf-next 4/8] bpf: Take module reference on kprobe_multi link Jiri Olsa
2022-10-11 7:16 ` Song Liu
2022-10-11 10:09 ` Jiri Olsa
2022-10-13 18:50 ` Andrii Nakryiko
2022-10-14 10:17 ` Jiri Olsa
2022-10-09 21:59 ` [PATCH bpf-next 5/8] selftests/bpf: Add load_kallsyms_refresh function Jiri Olsa
2022-10-11 7:17 ` Song Liu
2022-10-09 21:59 ` [PATCH bpf-next 6/8] selftests/bpf: Add bpf_testmod_fentry_* functions Jiri Olsa
2022-10-11 7:24 ` Song Liu
2022-10-09 21:59 ` [PATCH bpf-next 7/8] selftests/bpf: Add kprobe_multi kmod link api tests Jiri Olsa
2022-10-11 7:27 ` Song Liu
2022-10-11 10:09 ` Jiri Olsa
2022-10-13 19:06 ` Andrii Nakryiko
2022-10-14 10:25 ` Jiri Olsa
2022-10-09 21:59 ` [PATCH bpf-next 8/8] selftests/bpf: Add kprobe_multi check to module attach test Jiri Olsa
2022-10-11 7:27 ` Song Liu
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