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
| ||
|
Message-Id: <20100928.233028.112599117.davem@davemloft.net> Date: Tue, 28 Sep 2010 23:30:28 -0700 (PDT) From: David Miller <davem@...emloft.net> To: gwurster@....carleton.ca Cc: kuznet@....inr.ac.ru, pekkas@...core.fi, jmorris@...ei.org, yoshfuji@...ux-ipv6.org, kaber@...sh.net, shemminger@...tta.com, eric.dumazet@...il.com, herbert@...dor.apana.org.au, ebiederm@...ssion.com, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH linux-2.6 v2] IPv6: Temp addresses are immediately deleted. From: Glenn Wurster <gwurster@....carleton.ca> Date: Mon, 27 Sep 2010 13:10:10 -0400 > There is a bug in the interaction between ipv6_create_tempaddr and > addrconf_verify. Because ipv6_create_tempaddr uses the cstamp and tstamp > from the public address in creating a private address, if we have not > received a router advertisement in a while, tstamp + temp_valid_lft might be > < now. If this happens, the new address is created inside > ipv6_create_tempaddr, then the loop within addrconf_verify starts again and > the address is immediately deleted. We are left with no temporary addresses > on the interface, and no more will be created until the public IP address is > updated. To avoid this, set the expiry time to be the minimum of the time > left on the public address or the config option PLUS the current age of the > public interface. > > Version 2, now with 100% fewer line wraps. Thanks to David Miller for > pointing out the line wrapping issue. > > Signed-off-by: Glenn Wurster <gwurster@....carleton.ca> This can only happen if we apply your other patch, which I showed was incorrect as per RFCs. We only create temporary address when public addresses are created, and this is the point where we are handling a router advertisement with non-zero Valid Lifetime. Therefore I'm not applying this patch either. -- 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