netdev - Re: [PATCH bpf v4 2/2] selftests/bpf: make sure optvals > PAGE

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Message-ID: <CAADnVQ+dnOzfY3GBqNFCeFapUP8npRzF9wumeTV+CC5han9pEA@mail.gmail.com>
Date:   Tue, 16 Jun 2020 16:06:10 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH bpf v4 2/2] selftests/bpf: make sure optvals > PAGE_SIZE
 are bypassed

On Tue, Jun 16, 2020 at 3:53 PM Stanislav Fomichev <sdf@...gle.com> wrote:
> +       if (ctx->level == SOL_IP && ctx->optname == IP_FREEBIND) {
> +               if (optval > optval_end) {

same issue as before ?
see reply in v3.

> +                       /* For optval > PAGE_SIZE, the actual data
> +                        * is not provided.
> +                        */
> +                       return 0; /* EPERM, unexpected data size */
> +               }
> +               return 1;
> +       }
> +