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  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:	Fri, 02 Jan 2015 16:13:55 -0500 (EST)
From:	David Miller <>
Subject: Re: tcp: Do not apply TSO segment limit to non-TSO packets

From: Herbert Xu <>
Date: Thu, 1 Jan 2015 00:39:23 +1100

> Thomas Jarosch reported IPsec TCP stalls when a PMTU event occurs.
> In fact the problem was completely unrelated to IPsec.  The bug is
> also reproducible if you just disable TSO/GSO.
> The problem is that when the MSS goes down, existing queued packet
> on the TX queue that have not been transmitted yet all look like
> TSO packets and get treated as such.
> This then triggers a bug where tcp_mss_split_point tells us to
> generate a zero-sized packet on the TX queue.  Once that happens
> we're screwed because the zero-sized packet can never be removed
> by ACKs.
> Fixes: 1485348d242 ("tcp: Apply device TSO segment limit earlier")
> Reported-by: Thomas Jarosch <>
> Signed-off-by: Herbert Xu <>

Applied and queued up for -stable, thanks Herbert.
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists