linux-kernel - [PATCH v3 bpf-next 0/2] bpf: add a ksym BPF iterator

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Message-Id: <1656942916-13491-1-git-send-email-alan.maguire@oracle.com>
Date:   Mon,  4 Jul 2022 14:55:14 +0100
From:   Alan Maguire <alan.maguire@...cle.com>
To:     ast@...nel.org, andrii@...nel.org, daniel@...earbox.net,
        songliubraving@...com
Cc:     kafai@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, jolsa@...nel.org, mhiramat@...nel.org,
        akpm@...ux-foundation.org, void@...ifault.com, swboyd@...omium.org,
        ndesaulniers@...gle.com, 9erthalion6@...il.com, kennyyu@...com,
        geliang.tang@...e.com, kuniyu@...zon.co.jp, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 bpf-next 0/2] bpf: add a ksym BPF iterator

a ksym BPF iterator would be useful as it would allow more flexible
interactions with kernel symbols than are currently supported; it could
for example create more efficient map representations for lookup,
speed up symbol resolution etc.

The idea was initially discussed here [1].

Changes since v2 [2]:

- set iter->show_value on initialization based on current creds
  and use it in selftest to determine if we show values
  (Yonghong, patches 1/2)
- inline iter registration into kallsyms_init (Yonghong, patch 1)

Changes since RFC [3]:

- change name of iterator (and associated structures/fields) to "ksym"
  (Andrii, patches 1, 2)
- remove dependency on CONFIG_PROC_FS; it was used for other BPF
  iterators, and I assumed it was needed because of seq ops but I
  don't think it is required on digging futher (Andrii, patch 1)

[1] https://lore.kernel.org/all/YjRPZj6Z8vuLeEZo@krava/
[2] https://lore.kernel.org/bpf/1656667620-18718-1-git-send-email-alan.maguire@oracle.com/
[3] https://lore.kernel.org/all/1656089118-577-1-git-send-email-alan.maguire@oracle.com/

Alan Maguire (2):
  bpf: add a ksym BPF iterator
  selftests/bpf: add a ksym iter subtest

 kernel/kallsyms.c                                 | 94 +++++++++++++++++++++++
 tools/testing/selftests/bpf/prog_tests/bpf_iter.c | 16 ++++
 tools/testing/selftests/bpf/progs/bpf_iter_ksym.c | 74 ++++++++++++++++++
 3 files changed, 184 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/progs/bpf_iter_ksym.c

-- 
1.8.3.1