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  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:	Thu, 15 Nov 2007 20:04:31 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	wangchen@...fujitsu.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] [IPV4] UDP: Always checksum even if without socket
 filter

From: Wang Chen <wangchen@...fujitsu.com>
Date: Fri, 16 Nov 2007 11:18:16 +0800

> Actually, I tested and found this issue.
> I sent 50 udp packets, which have wrong checksum, to my
> machine.
> Before the patch being applied, /proc/net/snmp's udp
> InDatagrams increased, and InErrors didn't increase.
> After the patch being applied, InErrors increased correctly
> and InDatagrams stayed unchanging.

That's right, InDataGrams will increase even if we haven't
verified the checksum yet.

When the user does a recvmsg() or a poll() on the socket,
we will notice the bad checksum then and increment InErrors.
We could in this case correct the InDatagrams counter by
decrementing it in this case.
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists