* ulogd2 / segfault in ulogd_raw2packet_BASE.c with kernel 4.8.1
@ 2016-10-09 21:31 Frank Reppin
2016-10-09 23:26 ` Eric Leblond
0 siblings, 1 reply; 6+ messages in thread
From: Frank Reppin @ 2016-10-09 21:31 UTC (permalink / raw)
To: netfilter
Hellos,
at first - sorry if this is the complete wrong place to
come up with this issue...
OS details:
=============
Debian Jessie 8.6 x64
ulogd2 -> 2.0.4-2+deb8u1
iptables -> 1.4.21-2+b1
libnetfilter-log1 -> 1.0.1-1.1
libnfnetlink0 -> 1.0.1-3
Problem:
==========
It segfaults... really soon after I connect via WLAN/hostapd
and some iptables log rule kicks in.
backtrace:
===========
Program received signal SIGSEGV, Segmentation fault.
_interp_iphdr (pi=0x555555768b50, len=0) at ulogd_raw2packet_BASE.c:718
718 ulogd_raw2packet_BASE.c: No such file or directory.
(gdb) bt
#0 _interp_iphdr (pi=0x555555768b50, len=0) at ulogd_raw2packet_BASE.c:718
#1 0x0000555555558dcb in ulogd_propagate_results
(pi=pi@entry=0x555555766090) at ulogd.c:518
#2 0x00007ffff740d1fb in interp_packet (ldata=0x7fffffffe290,
pf_family=2 '\002', upi=0x555555766090) at ulogd_inppkt_NFLOG.c:400
#3 msg_cb (gh=<optimized out>, nfmsg=0x7ffff7fc67d8,
nfa=0x7fffffffe290, data=0x555555766090) at ulogd_inppkt_NFLOG.c:483
#4 0x00007ffff7208307 in ?? () from
/usr/lib/x86_64-linux-gnu/libnetfilter_log.so.1
#5 0x00007ffff7003627 in nfnl_handle_packet () from
/usr/lib/x86_64-linux-gnu/libnfnetlink.so.0
#6 0x00007ffff740cafe in nful_read_cb (fd=<optimized out>,
what=<optimized out>, param=0x555555766090) at ulogd_inppkt_NFLOG.c:463
#7 0x00005555555594a8 in ulogd_select_main (tv=<optimized out>) at
select.c:105
#8 0x0000555555556ed7 in ulogd_main_loop () at ulogd.c:934
#9 main (argc=<optimized out>, argv=<optimized out>) at ulogd.c:1477
Additional details:
====================
ulogd2 used to behave fine here (no segfaults/no issues at all) with
previous kernel releases (for example 4.7.7 is OK)
Thankyou for any insights!
Frank Reppin
--
43rd Law of Computing:
Anything that can go wr
fortune: Segmentation violation -- Core dumped
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: ulogd2 / segfault in ulogd_raw2packet_BASE.c with kernel 4.8.1
2016-10-09 21:31 ulogd2 / segfault in ulogd_raw2packet_BASE.c with kernel 4.8.1 Frank Reppin
@ 2016-10-09 23:26 ` Eric Leblond
2016-10-10 21:34 ` Frank Reppin
0 siblings, 1 reply; 6+ messages in thread
From: Eric Leblond @ 2016-10-09 23:26 UTC (permalink / raw)
To: Frank Reppin, netfilter
Hello,
On Sun, 2016-10-09 at 23:31 +0200, Frank Reppin wrote:
> Hellos,
>
> at first - sorry if this is the complete wrong place to
> come up with this issue...
>
> OS details:
> =============
> Debian Jessie 8.6 x64
> ulogd2 -> 2.0.4-2+deb8u1
> iptables -> 1.4.21-2+b1
> libnetfilter-log1 -> 1.0.1-1.1
> libnfnetlink0 -> 1.0.1-3
>
> Problem:
> ==========
> It segfaults... really soon after I connect via WLAN/hostapd
> and some iptables log rule kicks in.
>
> backtrace:
> ===========
> Program received signal SIGSEGV, Segmentation fault.
> _interp_iphdr (pi=0x555555768b50, len=0) at
> ulogd_raw2packet_BASE.c:718
> 718 ulogd_raw2packet_BASE.c: No such file or directory.
> (gdb) bt
> #0 _interp_iphdr (pi=0x555555768b50, len=0) at
> ulogd_raw2packet_BASE.c:718
> #1 0x0000555555558dcb in ulogd_propagate_results
> (pi=pi@entry=0x555555766090) at ulogd.c:518
> #2 0x00007ffff740d1fb in interp_packet (ldata=0x7fffffffe290,
> pf_family=2 '\002', upi=0x555555766090) at ulogd_inppkt_NFLOG.c:400
> #3 msg_cb (gh=<optimized out>, nfmsg=0x7ffff7fc67d8,
> nfa=0x7fffffffe290, data=0x555555766090) at ulogd_inppkt_NFLOG.c:483
> #4 0x00007ffff7208307 in ?? () from
> /usr/lib/x86_64-linux-gnu/libnetfilter_log.so.1
> #5 0x00007ffff7003627 in nfnl_handle_packet () from
> /usr/lib/x86_64-linux-gnu/libnfnetlink.so.0
> #6 0x00007ffff740cafe in nful_read_cb (fd=<optimized out>,
> what=<optimized out>, param=0x555555766090) at
> ulogd_inppkt_NFLOG.c:463
> #7 0x00005555555594a8 in ulogd_select_main (tv=<optimized out>) at
> select.c:105
> #8 0x0000555555556ed7 in ulogd_main_loop () at ulogd.c:934
> #9 main (argc=<optimized out>, argv=<optimized out>) at ulogd.c:1477
>
> Additional details:
> ====================
> ulogd2 used to behave fine here (no segfaults/no issues at all) with
> previous kernel releases (for example 4.7.7 is OK)
From what I can see, it looks possible there is a problem introduced by
copy range handling change introduce in this kernel.
Is it possible for you to test latest iptables ? It should handle the
range correctly and this should fix the problem.
In the mean time, I'll continue to investigate.
BR,
--
Eric Leblond <eric@regit.org>
Blog: https://home.regit.org/
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: ulogd2 / segfault in ulogd_raw2packet_BASE.c with kernel 4.8.1
2016-10-09 23:26 ` Eric Leblond
@ 2016-10-10 21:34 ` Frank Reppin
2016-10-11 7:16 ` frank
0 siblings, 1 reply; 6+ messages in thread
From: Frank Reppin @ 2016-10-10 21:34 UTC (permalink / raw)
To: netfilter
Hi Eric,
dear list,
On 10.10.2016 01:26, Eric Leblond wrote:
[...]
> From what I can see, it looks possible there is a problem introduced by
> copy range handling change introduce in this kernel.
>
> Is it possible for you to test latest iptables ? It should handle the
> range correctly and this should fix the problem.
Hm - weird - but no success.
I've just tested both - iptables 1.6.0 release and the most current git
master of iptables - a couple of minutes ago.
Both let ulogd2 (default debian jessie package) segfault - the backtrace
is the same in each case (... and same compared to the one in my initial
post).
cheers,
frank\
--
43rd Law of Computing:
Anything that can go wr
fortune: Segmentation violation -- Core dumped
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: ulogd2 / segfault in ulogd_raw2packet_BASE.c with kernel 4.8.1
2016-10-10 21:34 ` Frank Reppin
@ 2016-10-11 7:16 ` frank
2016-10-16 20:11 ` Frank Reppin
2016-10-17 19:34 ` Pablo Neira Ayuso
0 siblings, 2 replies; 6+ messages in thread
From: frank @ 2016-10-11 7:16 UTC (permalink / raw)
To: netfilter
Hi Eric,
dear list,
just a short update on this issue...
There's someone over at LKML with the same issue and there
seems to be fix for this on the way.
Your earlier assumption about the kernel changes were true:
http://www.gossamer-threads.com/lists/linux/kernel/2538445?do=post_view_threaded
cheers,
frank\
--
43rd Law of Computing:
Anything that can go wr
fortune: Segmentation violation -- Core dumped
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: ulogd2 / segfault in ulogd_raw2packet_BASE.c with kernel 4.8.1
2016-10-11 7:16 ` frank
@ 2016-10-16 20:11 ` Frank Reppin
2016-10-17 19:34 ` Pablo Neira Ayuso
1 sibling, 0 replies; 6+ messages in thread
From: Frank Reppin @ 2016-10-16 20:11 UTC (permalink / raw)
To: netfilter
Hellos,
I had some hope to see a fix in 4.8.2 - just because
of
http://www.gossamer-threads.com/lists/linux/kernel/2541078?do=post_view_threaded#2541078
... and Lipings later reply stating that he would send
an official patch later.
But the changelog (diff) for 4.8.2 doesn't suggest that
this is fixed know.
Any objections to see this in 4.8.3?
cheers,
frank\
--
43rd Law of Computing:
Anything that can go wr
fortune: Segmentation violation -- Core dumped
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: ulogd2 / segfault in ulogd_raw2packet_BASE.c with kernel 4.8.1
2016-10-11 7:16 ` frank
2016-10-16 20:11 ` Frank Reppin
@ 2016-10-17 19:34 ` Pablo Neira Ayuso
1 sibling, 0 replies; 6+ messages in thread
From: Pablo Neira Ayuso @ 2016-10-17 19:34 UTC (permalink / raw)
To: frank; +Cc: netfilter
On Tue, Oct 11, 2016 at 09:16:22AM +0200, frank wrote:
> Hi Eric,
> dear list,
>
> just a short update on this issue...
>
> There's someone over at LKML with the same issue and there
> seems to be fix for this on the way.
> Your earlier assumption about the kernel changes were true:
>
> http://www.gossamer-threads.com/lists/linux/kernel/2538445?do=post_view_threaded
I have just applied the fix for 4.8, will take a little while to
propagate this to -stable.
Meanwhile, oneliner patch to fix it is here:
http://patchwork.ozlabs.org/patch/680773/
^ permalink raw reply [flat|nested] 6+ messages in thread
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2016-10-09 21:31 ulogd2 / segfault in ulogd_raw2packet_BASE.c with kernel 4.8.1 Frank Reppin
2016-10-09 23:26 ` Eric Leblond
2016-10-10 21:34 ` Frank Reppin
2016-10-11 7:16 ` frank
2016-10-16 20:11 ` Frank Reppin
2016-10-17 19:34 ` Pablo Neira Ayuso
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