From: Ben Hutchings <ben@decadent.org.uk>
To: Kangjie Lu <kangjielu@gmail.com>, davem@davemloft.net
Cc: kan.liang@intel.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, taesoo@gatech.edu,
csong84@gatech.edu, Kangjie Lu <kjlu@gatech.edu>
Subject: Re: [PATCH] ethtool: fix a kernel infoleak in ethtool_get_pauseparam
Date: Wed, 01 Jun 2016 18:14:24 +0100 [thread overview]
Message-ID: <1464801264.2847.76.camel@decadent.org.uk> (raw)
In-Reply-To: <1464791961-8169-1-git-send-email-kjlu@gatech.edu>
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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@gatech.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.
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prev parent reply other threads:[~2016-06-01 17:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-01 14:39 [PATCH] ethtool: fix a kernel infoleak in ethtool_get_pauseparam Kangjie Lu
2016-06-01 14:57 ` Edward Cree
2016-06-01 17:14 ` Ben Hutchings [this message]
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