netdev - Re: [PATCH bpf] bpf: fix out-of-bounds read in __bpf_skc

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Date:   Tue, 21 May 2019 16:47:29 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Lorenz Bauer <lmb@...udflare.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.com
Cc:     joe@...valent.com
Subject: Re: [PATCH bpf] bpf: fix out-of-bounds read in __bpf_skc_lookup

On 05/21/2019 09:52 AM, Lorenz Bauer wrote:
> __bpf_skc_lookup takes a socket tuple and the length of the
> tuple as an argument. Based on the length, it decides which
> address family to pass to the helper function sk_lookup.
> 
> In case of AF_INET6, it fails to verify that the length
> of the tuple is long enough. sk_lookup may therefore access
> data past the end of the tuple.
> 
> Fixes: 6acc9b432e67 ("bpf: Add helper to retrieve socket in BPF")
> Signed-off-by: Lorenz Bauer <lmb@...udflare.com>

Applied, thanks!