[PATCH bpf 0/3] Pin the start cgroup for cgroup iterator

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From: Hou Tao <houtao1@xxxxxxxxxx>

Hi,

The patchset tries to fix the potential use-after-free problem in cgroup
iterator. The problem is similar with the UAF problem fixed in map
iterator and the fixes is also similar: pinning the iterated resource
in .init_seq_private() and unpinning in .fini_seq_private(). Also adding
a test to demonstrate the problem.

Not sure whether or not it will be helpful to add some comments for
.init_seq_private() to state that the implementation of
.init_seq_private() should not depend on iterator link to guarantee
the liveness of iterated object. Comments are always welcome.

Hou Tao (3):
  bpf: Pin the start cgroup in cgroup_iter_seq_init()
  selftests/bpf: Add cgroup helper remove_cgroup()
  selftests/bpf: Add test for cgroup iterator on a dead cgroup

 kernel/bpf/cgroup_iter.c                      | 14 ++++
 tools/testing/selftests/bpf/cgroup_helpers.c  | 19 +++++
 tools/testing/selftests/bpf/cgroup_helpers.h  |  1 +
 .../selftests/bpf/prog_tests/cgroup_iter.c    | 78 +++++++++++++++++++
 4 files changed, 112 insertions(+)

-- 
2.29.2




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