A tc, xdp, socket_filter or flow_dissector program updating or deleting
a sockmap deadlocks on stab->lock vs sk_callback_lock and has no reason
to. Patch 1 disallows it in may_update_sockmap(); patch 2 drops the
selftests that exercised it.

v4:
 - also drop BPF_PROG_TYPE_SOCKET_FILTER (John Fastabend)

v3:
 - https://lore.kernel.org/all/20260629172704.1302218-1-rhkrqnwk98@gmail.com/ (local)

v2:
 - https://lore.kernel.org/all/20260620034632.2308-1-rhkrqnwk98@gmail.com/ (local)

v1:
 - https://lore.kernel.org/all/20260616091153.2966617-1-rhkrqnwk98@gmail.com/ (local)

Sechang Lim (2):
  bpf, sockmap: disallow update and delete from tc, xdp, socket_filter
    and flow_dissector
  selftests/bpf: drop tc/xdp/flow_dissector/socket_filter sockmap
    mutation tests

 kernel/bpf/verifier.c                         |  5 --
 .../selftests/bpf/prog_tests/fexit_bpf2bpf.c  | 13 -----
 .../selftests/bpf/prog_tests/sockmap_basic.c  | 52 -------------------
 .../bpf/progs/freplace_cls_redirect.c         | 34 ------------
 .../selftests/bpf/progs/test_sockmap_update.c | 48 -----------------
 .../bpf/progs/verifier_sockmap_mutate.c       | 12 ++---
 6 files changed, 6 insertions(+), 158 deletions(-)
 delete mode 100644 tools/testing/selftests/bpf/progs/freplace_cls_redirect.c
 delete mode 100644 tools/testing/selftests/bpf/progs/test_sockmap_update.c

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2.43.0