Le 28/05/2014 11:18, Michal Schmidt a écrit :

On 05/28/2014 09:42 AM, Nicolas Dichtel wrote:

quoted

Le 27/05/2014 15:16, Michal Schmidt a écrit :

quoted

Any process is able to send netlink messages with leftover bytes, so
downgrade the warning message to pr_debug in order to avoid possible
kernel log spam.

Yes, but that's not a normal case. I think that the level warning is good,
there is something wrong with this kind of messages.

As an alternative we could at least guard it with net_ratelimit().

I would prefer this solution.

But still, the message indicates a userspace bug. It can be useful
for a developer of a netlink library, but not for many more.

Or to let you know why a userspace tool does not work ;-)

I think it's odd to let unprivileged userspace spam the dmesg,
even if rate-limited. The kernel does not emit warning messages when
userspace is buggy in other ways, like calling syscalls with invalid
arguments.

If it's really a problem (this message is here since 2.6.15 and nobody
complains), maybe a level between warning and debug may be acceptable.


Regards,
Nicolas