netdev - Re: [PATCH] ethtool: fix a kernel infoleak in ethtool_get

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 Jun 2016 18:14:24 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Kangjie Lu <kangjielu@...il.com>, davem@...emloft.net
Cc:	kan.liang@...el.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, taesoo@...ech.edu,
	csong84@...ech.edu, Kangjie Lu <kjlu@...ech.edu>
Subject: Re: [PATCH] ethtool: fix a kernel infoleak in ethtool_get_pauseparam

On Wed, 2016-06-01 at 16:39 +0200, Kangjie Lu wrote:
> The field autoneg of pauseparam is not initialized in some
> implementations of get_pauseparam(),

Nonsense.  The current implementation initialises all fields.  (If
there was padding in the structure, this change would be needed to
guarantee that the padding was initialised.  But there isn't.)

Ben.

>  but the whole object is
> copied to userland.
> 
> Signed-off-by: Kangjie Lu <kjlu@...ech.edu>
> ---
>  net/core/ethtool.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/net/core/ethtool.c b/net/core/ethtool.c
> index f426c5a..84544bd 100644
> --- a/net/core/ethtool.c
> +++ b/net/core/ethtool.c
> @@ -1723,7 +1723,10 @@ static noinline_for_stack int
> ethtool_set_channels(struct net_device *dev,
>  
>  static int ethtool_get_pauseparam(struct net_device *dev, void
> __user *useraddr)
>  {
> -	struct ethtool_pauseparam pauseparam = { ETHTOOL_GPAUSEPARAM
> };
> +	struct ethtool_pauseparam pauseparam;
> +
> +	memset(&pauseparam, 0, sizeof(pauseparam));
> +	pauseparam.cmd = ETHTOOL_GPAUSEPARAM;
>  
>  	if (!dev->ethtool_ops->get_pauseparam)
>  		return -EOPNOTSUPP;
-- 
Ben Hutchings
To err is human; to really foul things up requires a computer.

Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)