linux-kernel - Re: [PATCH v1] xfrm: add forgotten nla_policy for XFRMA_MTIMER

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Message-ID: <5be7712f.ead00.1899266e0a1.Coremail.linma@zju.edu.cn>
Date:   Wed, 26 Jul 2023 21:32:43 +0800 (GMT+08:00)
From:   "Lin Ma" <linma@....edu.cn>
To:     "Leon Romanovsky" <leon@...nel.org>
Cc:     steffen.klassert@...unet.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] xfrm: add forgotten nla_policy for
 XFRMA_MTIMER_THRESH

Hello Leon,

> 
> This CVE is a joke, you need to be root to execute this attack.
> 

Not really, this call routine only checks

  if (!netlink_net_capable(skb, CAP_NET_ADMIN))
    return -EPERM;

and any users in most vendor kernel can create a network namespace to
get such privilege and trigger this bug.

> Anyway change is ok.
> Reviewed-by: Leon Romanovsky <leonro@...dia.com>

Regards
Lin