netdev - [PATCH bpf-next 0/3] bpf: Fix cookie values for kprobe multi

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Message-Id: <20220527205611.655282-1-jolsa@kernel.org>
Date:   Fri, 27 May 2022 22:56:08 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: [PATCH bpf-next 0/3] bpf: Fix cookie values for kprobe multi

hi,
there's bug in kprobe_multi link that makes cookies misplaced when
using symbols to attach. The reason is that we sort symbols by name
but not adjacent cookie values. Current test did not find it because
bpf_fentry_test* are already sorted by name.

thanks,
jirka


---
Jiri Olsa (3):
      selftests/bpf: Shuffle cookies symbols in kprobe multi test
      ftrace: Keep address offset in ftrace_lookup_symbols
      bpf: Force cookies array to follow symbols sorting

 kernel/trace/bpf_trace.c                            | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++---------------
 kernel/trace/ftrace.c                               | 13 +++++++++++--
 tools/testing/selftests/bpf/prog_tests/bpf_cookie.c | 78 +++++++++++++++++++++++++++++++++++++++---------------------------------------
 tools/testing/selftests/bpf/progs/kprobe_multi.c    | 24 ++++++++++++------------
 4 files changed, 112 insertions(+), 68 deletions(-)