netdev - Re: [PATCH net v2] lwtunnel: fix autoload of lwt modules

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]

Date:   Wed, 18 Jan 2017 17:07:48 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     dsa@...ulusnetworks.com
Cc:     netdev@...r.kernel.org, rshearma@...cade.com
Subject: Re: [PATCH net v2] lwtunnel: fix autoload of lwt modules

From: David Ahern <dsa@...ulusnetworks.com>
Date: Tue, 17 Jan 2017 14:57:36 -0800

> Trying to add an mpls encap route when the MPLS modules are not loaded
> hangs. For example:
 ...
> The problem is that lwtunnel_build_state is called with rtnl lock
> held preventing mpls_init from registering.
> 
> Given the potential references held by the time lwtunnel_build_state it
> can not drop the rtnl lock to the load module. So, extract the module
> loading code from lwtunnel_build_state into a new function to validate
> the encap type. The new function is called while converting the user
> request into a fib_config which is well before any table, device or
> fib entries are examined.
> 
> Fixes: 745041e2aaf1 ("lwtunnel: autoload of lwt modules")
> Signed-off-by: David Ahern <dsa@...ulusnetworks.com>
> ---
> v2
> - extract the module load attempt into a separate function that is
>   called early in the newroute code paths

Ok, this looks like it should work.

Assuming it passed my build tests, I'll push this out and queue it for
-stable.

Thanks!