[PATCH bpf 0/9] fixes for bpf map iterator

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From: Hou Tao <houtao1@xxxxxxxxxx>

Hi,

The patchset constitues three fixes for bpf map iterator:

(1) patch 1~4: fix user-after-free during reading map iterator fd
It is possible when both the corresponding link fd and map fd are
closed bfore reading the iterator fd. I had squashed these four patches
into one, but it was not friendly for stable backport, so I break these
fixes into 4 single patches in the end. Patch 7 is its testing patch.

(2) patch 5: fix invalidity check for values in sk local storage map
Patch 8 adds two tests for it.

(3) patch 6: reject sleepable program for non-resched map iterator
Patch 9 add a test for it.

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

Regards,
Tao

Hou Tao (9):
  bpf: Acquire map uref in .init_seq_private for array map iterator
  bpf: Acquire map uref in .init_seq_private for hash map iterator
  bpf: Acquire map uref in .init_seq_private for sock local storage map
    iterator
  bpf: Acquire map uref in .init_seq_private for sock{map,hash} iterator
  bpf: Check the validity of max_rdwr_access for sk storage map iterator
  bpf: Only allow sleepable program for resched-able iterator
  selftests/bpf: Add tests for reading a dangling map iter fd
  selftests/bpf: Add write tests for sk storage map iterator
  selftests/bpf: Ensure sleepable program is rejected by hash map iter

 kernel/bpf/arraymap.c                         |   7 ++
 kernel/bpf/bpf_iter.c                         |  11 +-
 kernel/bpf/hashtab.c                          |   2 +
 net/core/bpf_sk_storage.c                     |  12 +-
 net/core/sock_map.c                           |  20 ++-
 .../selftests/bpf/prog_tests/bpf_iter.c       | 114 +++++++++++++++++-
 .../bpf/progs/bpf_iter_bpf_hash_map.c         |   9 ++
 .../bpf/progs/bpf_iter_bpf_sk_storage_map.c   |  20 ++-
 8 files changed, 189 insertions(+), 6 deletions(-)

-- 
2.29.2




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