netdev - Re: [PATCH] netlink: Fix spectre v1 gadget in netlink

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, 01 Aug 2018 09:51:35 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     jcline@...hat.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        jpoimboe@...hat.com
Subject: Re: [PATCH] netlink: Fix spectre v1 gadget in netlink_create()

From: Jeremy Cline <jcline@...hat.com>
Date: Tue, 31 Jul 2018 21:13:16 +0000

> 'protocol' is a user-controlled value, so sanitize it after the bounds
> check to avoid using it for speculative out-of-bounds access to arrays
> indexed by it.
> 
> This addresses the following accesses detected with the help of smatch:
> 
> * net/netlink/af_netlink.c:654 __netlink_create() warn: potential
>   spectre issue 'nlk_cb_mutex_keys' [w]
> 
> * net/netlink/af_netlink.c:654 __netlink_create() warn: potential
>   spectre issue 'nlk_cb_mutex_key_strings' [w]
> 
> * net/netlink/af_netlink.c:685 netlink_create() warn: potential spectre
>   issue 'nl_table' [w] (local cap)
> 
> Cc: Josh Poimboeuf <jpoimboe@...hat.com>
> Signed-off-by: Jeremy Cline <jcline@...hat.com>

Applied and queued up for -stable, thanks.