netdev - RE: [PATCH bpf v2 1/4] bpf, sockmap: Don't let sock_map

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Date:   Tue, 24 Jan 2023 21:20:55 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     Jakub Sitnicki <jakub@...udflare.com>, bpf@...r.kernel.org
Cc:     netdev@...r.kernel.org, John Fastabend <john.fastabend@...il.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>, kernel-team@...udflare.com
Subject: RE: [PATCH bpf v2 1/4] bpf, sockmap: Don't let
 sock_map_{close,destroy,unhash} call itself

Jakub Sitnicki wrote:
> sock_map proto callbacks should never call themselves by design. Protect
> against bugs like [1] and break out of the recursive loop to avoid a stack
> overflow in favor of a resource leak.
> 
> [1] https://lore.kernel.org/all/00000000000073b14905ef2e7401@google.com/
> 
> Suggested-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
> ---

LGTM and warn once logic should be fine IMO.

Acked-by: John Fastabend <john.fastabend@...il.com>