netdev - Re: Kernel memory corruption in CIPSO labeled TCP packets processing.

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Date:   Tue, 29 Jan 2019 10:23:29 +0300
From:   Nazarov Sergey <s-nazarov@...dex.ru>
To:     Paul Moore <paul@...l-moore.com>
Cc:     "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "selinux@...r.kernel.org" <selinux@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: Kernel memory corruption in CIPSO labeled TCP packets processing.

29.01.2019, 01:18, "Paul Moore" <paul@...l-moore.com>:
> If we don't pass a skb into ip_options_compile(), meaning both "skb"
> and "rt" will be NULL, then I don't believe the option data will
> change. Am I missing something?
>
> --
> paul moore
> www.paul-moore.com

I mean, in cipso_v4_error we copy option data from skb before ip_options_compile call:
+       memcpy(opt->__data, (unsigned char *)&(ip_hdr(skb)[1]), opt->optlen);
But skb IP header data could be already changed by first call of ip_options_compile
when packet received.