Patrick McHardy wrote:
Fabian Hugelshofer wrote:
I tracked the issue down to a byte alignment problem in
ulog_packet_msg_t (include/linux/netfilter_ipv4/ipt_ULOG.h). Setting
attributes 'packed' or 'aligned' or using 'size_t' instead of 'unsigned
char' for field 'mac_len' solved the problem. It seems necessary to help
the compiler doing things right.
[...]
I'm afraid it might break compatibility on other architectures.
Are your userspace and kernel compiled using the same options?
Why would they lay out the structure differently?
I think you are right. The compiler lays it out consistantly while
respecting proper alignment. I removed my patch again and it worked
event without. I think the reason was header files which were out of
sync (kernel vs. userspace). I had to modify ipt_ULOG.(c|h) for a driver
problem workaround. I'm quire sure that I reverted the changes during
the testing, but maybe I missed that.
I would write again, if the problem reappears later.
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