1. 25 Aug, 2016 1 commit
    • Liping Zhang's avatar
      netfilter: nft_reject: restrict to INPUT/FORWARD/OUTPUT · 89e1f6d2
      Liping Zhang authored
      After I add the nft rule "nft add rule filter prerouting reject
      with tcp reset", kernel panic happened on my system:
        NULL pointer dereference at ...
        IP: [<ffffffff81b9db2f>] nf_send_reset+0xaf/0x400
        Call Trace:
        [<ffffffff81b9da80>] ? nf_reject_ip_tcphdr_get+0x160/0x160
        [<ffffffffa0928061>] nft_reject_ipv4_eval+0x61/0xb0 [nft_reject_ipv4]
        [<ffffffffa08e836a>] nft_do_chain+0x1fa/0x890 [nf_tables]
        [<ffffffffa08e8170>] ? __nft_trace_packet+0x170/0x170 [nf_tables]
        [<ffffffffa06e0900>] ? nf_ct_invert_tuple+0xb0/0xc0 [nf_conntrack]
        [<ffffffffa07224d4>] ? nf_nat_setup_info+0x5d4/0x650 [nf_nat]
        [...]
      
      Because in the PREROUTING chain, routing information is not exist,
      then we will dereference the NULL pointer and oops happen.
      
      So we restrict reject expression to INPUT, FORWARD and OUTPUT chain.
      This is consistent with iptables REJECT target.
      Signed-off-by: default avatarLiping Zhang <liping.zhang@spreadtrum.com>
      Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
      89e1f6d2
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