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Date: Fri, 21 Sep 2012 22:08:46 +0200
From: Ingo Molnar <mingo@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "H. Peter Anvin" <hpa@linux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>,
        Kees Cook <keescook@chromium.org>, Linda Wang <lwang@redhat.com>,
        Matt Fleming <matt.fleming@intel.com>
Subject: Re: [PATCH 00/11] x86: Supervisor Mode Access Prevention
Message-ID: <20120921200846.GA25679@gmail.com>
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* Linus Torvalds <torvalds@linux-foundation.org> wrote:

> On Fri, Sep 21, 2012 at 12:43 PM, H. Peter Anvin <hpa@linux.intel.com> wrote:
>
> > Supervisor Mode Access Prevention (SMAP) is a new security 
> > feature disclosed by Intel in revision 014 of the Intel® 
> > Architecture Instruction Set Extensions Programming 
> > Reference:
> 
> Looks good.
> 
> Did this find any bugs, btw? We've had a few cases where we 
> forgot to use the proper user access function, and code just 
> happened to work because it all boils down to the same thing 
> and never got any page faults in practice anyway..

The 4g:4g patch sweeped out most of the historic ones - so what 
we have are perhaps newer bugs (but those should be pretty rare, 
most new features are cross-arch).

Thanks,

	Ingo