'skb' buffer address information leakage

From: Dison River
Date: Tue Jul 04 2017 - 01:12:53 EST

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);
seq_printf(file, " frag=%p", skb);
drivers/net/wireless/ath/wil6210/debugfs.c:926 seq_printf(s,
" SKB = 0x%p\n", skb);