netdev - Re: [PATCH net-next 1/3] genetlink: do not validate dump requests if there is no policy

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <031933f3fc4b26e284912771b480c87483574bea.camel@sipsolutions.net>
Date:   Thu, 02 May 2019 14:51:33 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     Michal Kubecek <mkubecek@...e.cz>,
        "David S. Miller" <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        David Ahern <dsahern@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 1/3] genetlink: do not validate dump requests
 if there is no policy

On Thu, 2019-05-02 at 12:48 +0000, Michal Kubecek wrote:
> Unlike do requests, dump genetlink requests now perform strict validation
> by default even if the genetlink family does not set policy and maxtype
> because it does validation and parsing on its own (e.g. because it wants to
> allow different message format for different commands). While the null
> policy will be ignored, maxtype (which would be zero) is still checked so
> that any attribute will fail validation.
> 
> The solution is to only call __nla_validate() from genl_family_rcv_msg()
> if family->maxtype is set.

D'oh. Which family was it that you found this on? I checked only ones
with policy I guess.

Reviewed-by: Johannes Berg <johannes@...solutions.net>

johannes