linux-kernel - Re: [PATCH v38 15/24] x86/sgx: Enable provisioning for remote attestation

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Date:   Mon, 21 Sep 2020 22:27:06 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, linux-sgx@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Jethro Beekman <jethro@...tanix.com>,
        Darren Kenny <darren.kenny@...cle.com>,
        Andy Lutomirski <luto@...nel.org>, akpm@...ux-foundation.org,
        andriy.shevchenko@...ux.intel.com, asapek@...gle.com,
        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, nhorman@...hat.com,
        npmccallum@...hat.com, puiterwijk@...hat.com, rientjes@...gle.com,
        sean.j.christopherson@...el.com, tglx@...utronix.de,
        yaozhangx@...gle.com
Subject: Re: [PATCH v38 15/24] x86/sgx: Enable provisioning for remote
 attestation

On Mon, Sep 21, 2020 at 08:07:28PM +0200, Borislav Petkov wrote:
> On Tue, Sep 15, 2020 at 02:28:33PM +0300, Jarkko Sakkinen wrote:
> > @@ -181,5 +192,12 @@ int __init sgx_drv_init(void)
> >  		return ret;
> >  	}
> >  
> > +	ret = misc_register(&sgx_dev_provision);
> > +	if (ret) {
> > +		pr_err("Creating /dev/sgx/provision failed with %d.\n", ret);
> > +		misc_deregister(&sgx_dev_enclave);
> 
> The comment over misc_deregister() says:
> 
>  *      Unregister a miscellaneous device that was previously
>  *      successfully registered with misc_register().
> 
> but this is not a successful registration here, in the if (ret) case...

'sgx_dev_enclave' is successfully register whenever that happens. Am I
missing something here?

> > + * sgx_ioc_enclave_set_attribute - handler for %SGX_IOC_ENCLAVE_PROVISION
> > + * @filep:	open file to /dev/sgx
>        ^^^^^^
> 
> Can you guess what my comment to that would be...?

There is also another incosistency that I fixed: the first line should
have 'sgx_ioc_enclave_provision'.

> > +static long sgx_ioc_enclave_provision(struct sgx_encl *encl,
> > +					  void __user *arg)
> 
> No need for the line break: both function args can fit on the same line.

Fixed this one too, thanks.

> 
> ...
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette

/Jarkko