linux-kernel - Re: [PATCH 14/25] x86/sgx: Tighten accessible memory range after enclave initialization

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Date:   Sat, 11 Dec 2021 10:01:00 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Reinette Chatre <reinette.chatre@...el.com>
Cc:     dave.hansen@...ux.intel.com, tglx@...utronix.de, bp@...en8.de,
        luto@...nel.org, mingo@...hat.com, linux-sgx@...r.kernel.org,
        x86@...nel.org, seanjc@...gle.com, kai.huang@...el.com,
        cathy.zhang@...el.com, cedric.xing@...el.com,
        haitao.huang@...el.com, mark.shanahan@...el.com, hpa@...or.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 14/25] x86/sgx: Tighten accessible memory range after
 enclave initialization

On Mon, 2021-12-06 at 13:45 -0800, Reinette Chatre wrote:
> Hi Jarkko,
> 
> On 12/4/2021 3:14 PM, Jarkko Sakkinen wrote:
> > > diff --git a/arch/x86/kernel/cpu/sgx/encl.c b/arch/x86/kernel/cpu/sgx/encl.c
> > > index 342b97dd4c33..37203da382f8 100644
> > > --- a/arch/x86/kernel/cpu/sgx/encl.c
> > > +++ b/arch/x86/kernel/cpu/sgx/encl.c
> > > @@ -403,6 +403,10 @@ int sgx_encl_may_map(struct sgx_encl *encl, unsigned long start,
> > >   
> > >   	XA_STATE(xas, &encl->page_array, PFN_DOWN(start));
> > >   
> > 
> > Please write a comment here.
> 
> Would the comment below suffice?
> 
> /* Disallow mapping outside enclave's address range. */

Yeah, looks good to me.

/Jarkko