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From: Stephen Hemminger <>
To: Dison River <>
Subject: Re: 'skb' buffer address information leakage
Date: Tue, 4 Jul 2017 11:13:44 -0700	[thread overview]
Message-ID: <20170704111344.416fadc5@xeon-e3> (raw)
In-Reply-To: <>

On Tue, 4 Jul 2017 13:12:18 +0800
Dison River <> wrote:

> Hi all:
> I'd found several address leaks of "skb" buffer.When i have a
> arbitrary address write vulnerability in kernel(enabled kASLR),I can
> use skb's address find sk_destruct's address and overwrite it. And
> then,invoke close(sock_fd) function can trigger the
> shellcode(sk_destruct func).
> In kernel 4.12-rc7
> drivers/net/irda/vlsi_ir.c:326           seq_printf(seq, "skb=%p
> data=%p hw=%p\n", rd->skb, rd->buf, rd->hw);
> drivers/net/ethernet/netronome/nfp/nfp_net_debugfs.c:167
>          seq_printf(file, " frag=%p", skb);
> drivers/net/wireless/ath/wil6210/debugfs.c:926           seq_printf(s,
> "  SKB = 0x%p\n", skb);
> Thanks.

Debugfs support is optional with Netronome. If concerned about security,
then it should be disabled.

The WIIL6210 driver debugfs has other worse address leaks.
The whole debugfs support in this driver should be made optional
(or removed).

The VLSI /oroc interface likewise should just be removed (or made
optional). Most distributions do not build IRDA anymore anyway.

      parent reply	other threads:[~2017-07-04 18:13 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-04  5:12 'skb' buffer address information leakage Dison River
2017-07-04  5:27 ` Jakub Kicinski
2017-07-04  7:44 ` Greg KH
2017-07-04 18:13 ` Stephen Hemminger [this message]

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