diff options
| author | Michal Luczaj <mhal@rbox.co> | 2026-04-14 16:13:17 +0200 |
|---|---|---|
| committer | Martin KaFai Lau <martin.lau@kernel.org> | 2026-04-15 17:22:55 -0700 |
| commit | 997b8483d44c60805c71a9882376a16eb176cb24 (patch) | |
| tree | c1a91343ac57030dd2e01d104f5fb5e632e7453a | |
| parent | 4d328dd695383224aa750ddee6b4ad40c0f8d205 (diff) | |
selftests/bpf: Extend bpf_iter_unix to attempt deadlocking
Updating a sockmap from a unix iterator prog may lead to a deadlock.
Piggyback on the original selftest.
Signed-off-by: Michal Luczaj <mhal@rbox.co>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Reviewed-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260414-unix-proto-update-null-ptr-deref-v4-3-2af6fe97918e@rbox.co
| -rw-r--r-- | tools/testing/selftests/bpf/progs/bpf_iter_unix.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_unix.c b/tools/testing/selftests/bpf/progs/bpf_iter_unix.c index fea275df9e22..a2652c8c3616 100644 --- a/tools/testing/selftests/bpf/progs/bpf_iter_unix.c +++ b/tools/testing/selftests/bpf/progs/bpf_iter_unix.c @@ -7,6 +7,13 @@ char _license[] SEC("license") = "GPL"; +SEC(".maps") struct { + __uint(type, BPF_MAP_TYPE_SOCKMAP); + __uint(max_entries, 1); + __type(key, __u32); + __type(value, __u64); +} sockmap; + static long sock_i_ino(const struct sock *sk) { const struct socket *sk_socket = sk->sk_socket; @@ -76,5 +83,8 @@ int dump_unix(struct bpf_iter__unix *ctx) BPF_SEQ_PRINTF(seq, "\n"); + /* Test for deadlock. */ + bpf_map_update_elem(&sockmap, &(int){0}, sk, 0); + return 0; } |