linux-kernel - Re: [PATCH v24 12/24] x86/sgx: Linux Enclave Driver

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Message-ID: <op.0b6gvhtiwjvjmi@hhuan26-mobl.amr.corp.intel.com>
Date:   Mon, 02 Dec 2019 09:48:43 -0600
From:   "Haitao Huang" <haitao.huang@...ux.intel.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org,
        "Jarkko Sakkinen" <jarkko.sakkinen@...ux.intel.com>
Cc:     akpm@...ux-foundation.org, dave.hansen@...el.com,
        sean.j.christopherson@...el.com, nhorman@...hat.com,
        npmccallum@...hat.com, serge.ayoun@...el.com,
        shay.katz-zamir@...el.com, haitao.huang@...el.com,
        andriy.shevchenko@...ux.intel.com, tglx@...utronix.de,
        kai.svahn@...el.com, bp@...en8.de, josh@...htriplett.org,
        luto@...nel.org, kai.huang@...el.com, rientjes@...gle.com,
        cedric.xing@...el.com, puiterwijk@...hat.com,
        linux-security-module@...r.kernel.org,
        "Suresh Siddha" <suresh.b.siddha@...el.com>
Subject: Re: [PATCH v24 12/24] x86/sgx: Linux Enclave Driver

On Fri, 29 Nov 2019 17:13:14 -0600, Jarkko Sakkinen  
<jarkko.sakkinen@...ux.intel.com> wrote:


> +
> +	for (c = 0 ; c < addp.length; c += PAGE_SIZE) {
> +		if (signal_pending(current)) {
> +			ret = -ERESTARTSYS;
> +			break;
> +		}

This IOC is not idempotent as pages EADDed at this point can not be  
re-EADDed again. So we can't return ERESTARTSYS

Haitao