linux-kernel - Re: [PATCH 2/2] Revert "dccp: don't free ccid2_hc_tx_sock struct in dccp

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Date:   Tue, 13 Oct 2020 20:59:50 +0200
From:   Richard Sailer <richard_siegfried@...temli.org>
To:     Kleber Sacilotto de Souza <kleber.souza@...onical.com>,
        netdev@...r.kernel.org
Cc:     Gerrit Renker <gerrit@....abdn.ac.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Thadeu Lima de Souza Cascardo <cascardo@...onical.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        "Alexander A. Klimov" <grandmaster@...klimov.de>,
        Kees Cook <keescook@...omium.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Alexey Kodanev <alexey.kodanev@...cle.com>,
        dccp@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] Revert "dccp: don't free ccid2_hc_tx_sock struct in
 dccp_disconnect()"

On 13/10/2020 19:18, Kleber Sacilotto de Souza wrote:
> rom: Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
> 
> This reverts commit 2677d20677314101293e6da0094ede7b5526d2b1.
> 
> This fixes an issue that after disconnect, dccps_hc_tx_ccid will still be
> kept, allowing the socket to be reused as a listener socket, and the cloned
> socket will free its dccps_hc_tx_ccid, leading to a later use after free,
> when the listener socket is closed.
> 
> This addresses CVE-2020-16119.
> 
> Fixes: 2677d2067731 (dccp: don't free ccid2_hc_tx_sock struct in dccp_disconnect())
> Reported-by: Hadar Manor
> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
> Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@...onical.com>
> ---
Acked-by: Richard Sailer <richard_siegfried@...temli.org>



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