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selftests/bpf: Extend bpf_iter_unix to attempt deadlocking

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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
This commit is contained in:
Michal Luczaj
2026-04-14 16:13:17 +02:00
committed by Martin KaFai Lau
parent 4d328dd695
commit 997b8483d4
1 changed files with 10 additions and 0 deletions
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10
tools/testing/selftests/bpf/progs/bpf_iter_unix.c
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@@ -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;
}