linux-kernel - Re: [PATCH v2] bpf: Add length check for SK_DIAG_BPF_STORAGE_REQ_MAP

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Message-ID: <c4ca108f891718188ea2a9560324d23de2740565.camel@redhat.com>
Date:   Thu, 27 Jul 2023 09:34:41 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Lin Ma <linma@....edu.cn>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, ast@...nel.org,
        martin.lau@...nel.org, yhs@...com, void@...ifault.com,
        andrii@...nel.org, houtao1@...wei.com, inwardvessel@...il.com,
        kuniyu@...zon.com, songliubraving@...com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH v2] bpf: Add length check for
 SK_DIAG_BPF_STORAGE_REQ_MAP_FD parsing

On Tue, 2023-07-25 at 10:33 +0800, Lin Ma wrote:
> The nla_for_each_nested parsing in function bpf_sk_storage_diag_alloc
> does not check the length of the nested attribute. This can lead to an
> out-of-attribute read and allow a malformed nlattr (e.g., length 0) to
> be viewed as a 4 byte integer.
> 
> This patch adds an additional check when the nlattr is getting counted.
> This makes sure the latter nla_get_u32 can access the attributes with
> the correct length.
> 
> Fixes: 1ed4d92458a9 ("bpf: INET_DIAG support in bpf_sk_storage")
> Suggested-by: Jakub Kicinski <kuba@...nel.org>
> Signed-off-by: Lin Ma <linma@....edu.cn>

I guess this should go via the ebpf tree, right? Setting the delegate
accordingly. 

Please correct me if I'm wrong.

Thanks!

/P