netdev - Re: [PATCH net] net: ipv6: Release route when device is unregistering

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] [day] [month] [year] [list]

Message-Id: <20170608.111306.987099708536491352.davem@davemloft.net>
Date:   Thu, 08 Jun 2017 11:13:06 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     dsahern@...il.com
Cc:     netdev@...r.kernel.org, roopa@...ulusnetworks.com
Subject: Re: [PATCH net] net: ipv6: Release route when device is
 unregistering

From: David Ahern <dsahern@...il.com>
Date: Wed,  7 Jun 2017 12:26:23 -0600

> Roopa reported attempts to delete a bond device that is referenced in a
> multipath route is hanging:
> 
> $ ifdown bond2    # ifupdown2 command that deletes virtual devices
> unregister_netdevice: waiting for bond2 to become free. Usage count = 2
> 
> Steps to reproduce:
>     echo 1 > /proc/sys/net/ipv6/conf/all/ignore_routes_with_linkdown
>     ip link add dev bond12 type bond
>     ip link add dev bond13 type bond
>     ip addr add 2001:db8:2::0/64 dev bond12
>     ip addr add 2001:db8:3::0/64 dev bond13
>     ip route add 2001:db8:33::0/64 nexthop via 2001:db8:2::2 nexthop via 2001:db8:3::2
>     ip link del dev bond12
>     ip link del dev bond13
> 
> The root cause is the recent change to keep routes on a linkdown. Update
> the check to detect when the device is unregistering and release the
> route for that case.
> 
> Fixes: a1a22c12060e4 ("net: ipv6: Keep nexthop of multipath route on admin down")
> Reported-by: Roopa Prabhu <roopa@...ulusnetworks.com>
> Signed-off-by: David Ahern <dsahern@...il.com>

Applied and queued up for -stable, thanks David.