[bpf,0/2] bpf fix for unconnect af_unix socket

Message

John Fastabend Dec. 1, 2023, 3:23 a.m. UTC

Eric reported a syzbot splat from a null ptr deref from recent fix to
resolve a use-after-free with af-unix stream sockets and BPF sockmap
usage.

The issue is I missed is we allow unconnected af_unix STREAM sockets to
be added to the sockmap. Fix this by blocking unconnected sockets.

John Fastabend (2):
  bpf: syzkaller found null ptr deref in unix_bpf proto add
  bpf: sockmap, test for unconnected af_unix sock

 include/net/sock.h                            |  5 +++
 net/core/sock_map.c                           |  2 ++
 .../selftests/bpf/prog_tests/sockmap_basic.c  | 34 +++++++++++++++++++
 3 files changed, 41 insertions(+)