Date: Fri, 8 Aug 2008 16:15:08 -0700
From: Suresh Siddha <suresh.b.siddha@intel.com>
To: Wolfgang Walter <wolfgang.walter@stwm.de>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>,
       Herbert Xu <herbert@gondor.apana.org.au>,
       "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       Ingo Molnar <mingo@elte.hu>
Subject: Re: Kernel oops with 2.6.26, padlock and ipsec: probably problem with fpu state changes
Message-ID: <20080808231508.GB13158@linux-os.sc.intel.com>
References: <200807171653.59177.wolfgang.walter@stwm.de> <200808082109.47284.wolfgang.walter@stwm.de> <20080808193252.GD607@linux-os.sc.intel.com> <200808090110.42391.wolfgang.walter@stwm.de>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <200808090110.42391.wolfgang.walter@stwm.de>
User-Agent: Mutt/1.4.1i
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 743
Lines: 18

On Fri, Aug 08, 2008 at 04:10:42PM -0700, Wolfgang Walter wrote:
> By the way, if padlock is used from userspace, could this be aproblem, too? I
> mean not via the kernel crypto layer but directly. I think these extensions
> are not restricted to a privileged user.

No. Userspace will not have any such issue. Kernel is special, as it
has to preserve the user-space context and also use these instructions
for its own kernel purpose.

It is ok to get a spurious DNA from userland.

thanks,
suresh
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/