linux-kernel - Re: [PATCH v3 13/25] x86/sgx: Add helpers to expose ECREATE and EINIT to KVM

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Date:   Tue, 6 Apr 2021 11:09:01 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Kai Huang <kai.huang@...el.com>
Cc:     kvm@...r.kernel.org, linux-sgx@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, seanjc@...gle.com, jarkko@...nel.org,
        luto@...nel.org, dave.hansen@...el.com, rick.p.edgecombe@...el.com,
        haitao.huang@...el.com, pbonzini@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, hpa@...or.com
Subject: Re: [PATCH v3 13/25] x86/sgx: Add helpers to expose ECREATE and
 EINIT to KVM

On Tue, Apr 06, 2021 at 08:59:58PM +1200, Kai Huang wrote:
> OK. My thinking was that, returning negative error value basically means guest
> will be killed.

You need to define how you're going to handle invalid input from the
guest. If that guest is considered malicious, then sure, killing it
makes sense.

> For the case access_ok() fails for @secs or other user pointers, it
> seems killing guest is a little it overkill,

So don't kill it then - just don't allow it to create an enclave because
it is doing stupid crap.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette