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

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Date: Fri, 28 Jul 2023 16:57:43 -0700
From: Martin KaFai Lau <martin.lau@...ux.dev>
To: Paolo Abeni <pabeni@...hat.com>, Lin Ma <linma@....edu.cn>
Cc: 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 7/27/23 12:34 AM, Paolo Abeni wrote:
> 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.

Already applied to the bpf tree. Thanks.
pw-bot seems not doing auto-reply for the bpf tree.