netdev - Re: Linux kernel error stack

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sun, 5 Aug 2018 15:56:25 -0400
From:   Satish Patel <satish.txt@...il.com>
To:     Florian Westphal <fw@...len.de>
Cc:     netdev@...r.kernel.org
Subject: Re: Linux kernel error stack

Oh wait!! I think you are right there i didn't notice that iptables
has following setting.

"CHECKSUM --checksum-fill"

On Sun, Aug 5, 2018 at 3:54 PM, Satish Patel <satish.txt@...il.com> wrote:
> I have following kernel logging set.
>
> [root@...ack-infra-02 tools]# cat /proc/sys/kernel/printk
> 3 4 1 3
>
>
> iptables output
>
> [root@...ack-infra-02 tools]# iptables-save -c
> # Generated by iptables-save v1.4.21 on Sun Aug  5 15:52:56 2018
> *raw
> :PREROUTING ACCEPT [42284573:38782693391]
> :OUTPUT ACCEPT [219668:42675751]
> COMMIT
> # Completed on Sun Aug  5 15:52:56 2018
> # Generated by iptables-save v1.4.21 on Sun Aug  5 15:52:56 2018
> *nat
> :PREROUTING ACCEPT [656413:38450886]
> :INPUT ACCEPT [5524:564390]
> :OUTPUT ACCEPT [3217:212903]
> :POSTROUTING ACCEPT [559058:34193539]
> [5197:311820] -A POSTROUTING -s 10.0.3.0/24 ! -d 10.0.3.0/24 -j MASQUERADE
> COMMIT
> # Completed on Sun Aug  5 15:52:56 2018
> # Generated by iptables-save v1.4.21 on Sun Aug  5 15:52:56 2018
> *mangle
> :PREROUTING ACCEPT [42209568:38687818558]
> :INPUT ACCEPT [170634:197796840]
> :FORWARD ACCEPT [42939243:38526139954]
> :OUTPUT ACCEPT [198956:41288636]
> :POSTROUTING ACCEPT [43138199:38567428590]
> [84166:59495417] -A POSTROUTING -p tcp -m tcp --sport 80 -j CHECKSUM
> --checksum-fill
> [68739:5153476] -A POSTROUTING -p tcp -m tcp --sport 8000 -j CHECKSUM
> --checksum-fill
> [755:275452] -A POSTROUTING -s 10.0.3.0/24 -o lxcbr0 -p udp -m udp
> --dport 68 -j CHECKSUM --checksum-fill
> COMMIT
> # Completed on Sun Aug  5 15:52:56 2018
> # Generated by iptables-save v1.4.21 on Sun Aug  5 15:52:56 2018
> *filter
> :INPUT ACCEPT [164954:197217701]
> :FORWARD ACCEPT [42801701:38377075499]
> :OUTPUT ACCEPT [198963:41289860]
> [0:0] -A INPUT -i lxcbr0 -p tcp -m tcp --dport 53 -j ACCEPT
> [4932:328918] -A INPUT -i lxcbr0 -p udp -m udp --dport 53 -j ACCEPT
> [0:0] -A INPUT -i lxcbr0 -p tcp -m tcp --dport 67 -j ACCEPT
> [755:250585] -A INPUT -i lxcbr0 -p udp -m udp --dport 67 -j ACCEPT
> [80745:145594351] -A FORWARD -o lxcbr0 -j ACCEPT
> [56801:3471569] -A FORWARD -i lxcbr0 -j ACCEPT
> COMMIT
> # Completed on Sun Aug  5 15:52:56 2018
>
> On Sun, Aug 5, 2018 at 3:42 PM, Florian Westphal <fw@...len.de> wrote:
>> Satish Patel <satish.txt@...il.com> wrote:
>>> Thanks Florian,
>>>
>>> FYI, I don't have any CHECKSUM configure in my iptables,
>>
>> You have, according to WARN stacktrace you provided.
>>
>> iptables-save -c
>> ip6tables-save -c