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[bpf-next,v3,0/3] Relax allowlist for open-coded css_task iter

Message ID 20231025075914.30979-1-zhouchuyi@bytedance.com (mailing list archive)
Headers show
Series Relax allowlist for open-coded css_task iter | expand

Message

Chuyi Zhou Oct. 25, 2023, 7:59 a.m. UTC 
Hi,
The patchset aims to relax the allowlist for open-coded css_task iter
suggested by Alexei[1].

Please see individual patches for more details. And comments are always
welcome.

Patch summary:
 * Patch #1: Relax the allowlist and let css_task iter can be used in
   bpf iters and any sleepable progs.
 * Patch #2: Add a test in cgroup_iters.c which demonstrates how
   css_task iters can be combined with cgroup iter.

link[1]:https://lore.kernel.org/lkml/CAADnVQKafk_junRyE=-FVAik4hjTRDtThymYGEL8hGTuYoOGpA@mail.gmail.com/

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Changes in v2:
 * Fix the incorrect logic in check_css_task_iter_allowlist. Use
   expected_attach_type to check whether we are using bpf_iters.
 * Link to v1:https://lore.kernel.org/bpf/20231022154527.229117-1-zhouchuyi@bytedance.com/T/#m946f9cde86b44a13265d9a44c5738a711eb578fd
Changes in v3:
 * Add a testcase to prove css_task can be used in fentry.s
 * Link to v2:https://lore.kernel.org/bpf/20231024024240.42790-1-zhouchuyi@bytedance.com/T/#m14a97041ff56c2df21bc0149449abd275b73f6a3

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Chuyi Zhou (3):
  bpf: Relax allowlist for css_task iter
  selftests/bpf: Add tests for css_task iter combining with cgroup iter
  selftests/bpf: Add test for using css_task iter in sleepable progs

 kernel/bpf/verifier.c                         | 16 ++++++--
 .../selftests/bpf/prog_tests/cgroup_iter.c    | 33 +++++++++++++++
 .../selftests/bpf/progs/iters_css_task.c      | 41 +++++++++++++++++++
 .../selftests/bpf/progs/iters_task_failure.c  | 23 ++++++++++-
 4 files changed, 107 insertions(+), 6 deletions(-)