linux-kernel - Re: [PATCH v32 08/21] x86/sgx: Initialize metadata for Enclave Page Cache (EPC) sections

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] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200615200705.GC5416@linux.intel.com>
Date:   Mon, 15 Jun 2020 23:07:05 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Jethro Beekman <jethro@...tanix.com>,
        Serge Ayoun <serge.ayoun@...el.com>, akpm@...ux-foundation.org,
        andriy.shevchenko@...ux.intel.com, asapek@...gle.com, bp@...en8.de,
        cedric.xing@...el.com, chenalexchen@...gle.com,
        conradparker@...gle.com, cyhanish@...gle.com,
        dave.hansen@...el.com, haitao.huang@...el.com,
        josh@...htriplett.org, kai.huang@...el.com, kai.svahn@...el.com,
        kmoy@...gle.com, ludloff@...gle.com, luto@...nel.org,
        nhorman@...hat.com, npmccallum@...hat.com, puiterwijk@...hat.com,
        rientjes@...gle.com, tglx@...utronix.de, yaozhangx@...gle.com
Subject: Re: [PATCH v32 08/21] x86/sgx: Initialize metadata for Enclave Page
 Cache (EPC) sections

On Mon, Jun 01, 2020 at 08:15:17AM -0700, Randy Dunlap wrote:
> Hi,
> 
> Sorry I didn't respond to v31 with this so that it could
> have been fixed in v32.

v32 was just a quick update to v31 (did both within maybe 2h window).

> 
> On 6/1/20 12:52 AM, Jarkko Sakkinen wrote:
> > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> > index 2d3f963fd6f1..d246c6071e8d 100644
> > --- a/arch/x86/Kconfig
> > +++ b/arch/x86/Kconfig
> > @@ -1948,6 +1948,22 @@ config X86_INTEL_TSX_MODE_AUTO
> >  	  side channel attacks- equals the tsx=auto command line parameter.
> >  endchoice
> >  
> > +config INTEL_SGX
> > +	bool "Intel SGX"
> > +	depends on X86_64 && CPU_SUP_INTEL
> > +	depends on CRYPTO=y
> > +	depends on CRYPTO_SHA256=y
> > +	select SRCU
> > +	select MMU_NOTIFIER
> > +	help
> > +	  Intel(R) SGX is a set of CPU instructions that can be used by
> > +	  applications to set aside private regions of code and data, referred
> > +	  to as enclaves. An enclave's private memory can only be accessed by
> > +	  code running within the enclave. Accesses from outside the enclave,
> > +	  including other enclaves, are disallowed by hardware.
> 
> Either the prompt
> 	bool "Intel SGX"
> or the help text should tell us what SGX means.
> (Software Guard eXtensions)

Agreed.

> 
> > +
> > +	  If unsure, say N.
> > +
> >  config EFI
> >  	bool "EFI runtime service support"
> >  	depends on ACPI
> 
> thanks.
> -- 
> ~Randy
> 

Thanks for the feedback. I updated https://github.com/jsakkine-intel/linux-sgx.git
accordingly.

/Jarkko