netdev - Re: [PATCH] e1000: Reset rx ring index on receive overrun

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 linux-cve-announce 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, 18 May 2012 01:28:21 +0200
From:	Samuel Thibault <samuel.thibault@...-lyon.org>
To:	"Dave, Tushar N" <tushar.n.dave@...el.com>
Cc:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>,
	"Skidmore, Donald C" <donald.c.skidmore@...el.com>,
	"Rose, Gregory V" <gregory.v.rose@...el.com>,
	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>,
	"Duyck, Alexander H" <alexander.h.duyck@...el.com>,
	"Ronciak, John" <john.ronciak@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Pirko <jpirko@...hat.com>,
	Dean Nelson <dnelson@...hat.com>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] e1000: Reset rx ring index on receive overrun

Dave, Tushar N, le Thu 17 May 2012 23:22:31 +0000, a écrit :
> I am interested in to see if you have actual test case and more importantly test data that shows that kernel and device indexes are not synchronized any more.

Well, it's not with an actual physical device, but with the kvm
emulation. Printing indexes from the clean_rx handler, I'm getting:

(status linux index/total size/device index)

status 7 2/256/19
status 7 3/256/19
...
status 7 18/256/19
status 7 19/256/19
status 7 20/256/19
status 7 21/256/19
...
since the status is still 7, linux continues on.

...
status 7 254/256/19
status 7 255/256/19
status 7 0/256/19
status 7 1/256/19
status 0 2/256/19

here it stops, and on next interrupts,

status 0 2/256/20

status 0 2/256/21
etc. and no progress is made any more, until

status 0 2/256/253
status 0 2/256/254

and it gets stuck there:

status 0 2/256/254
status 0 2/256/254
status 0 2/256/254

Samuel
--
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