linux-kernel - Re: [PATCH v14 00/13] Introduce support for guest CET feature

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Message-ID: <YBL8wOsgzTtKWXgU@google.com>
Date:   Thu, 28 Jan 2021 10:04:48 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Yang Weijiang <weijiang.yang@...el.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, jmattson@...gle.com,
        yu.c.zhang@...ux.intel.com
Subject: Re: [PATCH v14 00/13] Introduce support for guest CET feature

On Thu, Jan 28, 2021, Paolo Bonzini wrote:
> On 06/11/20 02:16, Yang Weijiang wrote:
> > Control-flow Enforcement Technology (CET) provides protection against
> > Return/Jump-Oriented Programming (ROP/JOP) attack. There're two CET
> > sub-features: Shadow Stack (SHSTK) and Indirect Branch Tracking (IBT).
> > SHSTK is to prevent ROP programming and IBT is to prevent JOP programming.

...

> I reviewed the patch and it is mostly okay.  However, if I understand it
> correctly, it will not do anything until host support materializes, because
> otherwise XSS will be 0.

IIRC, it won't even compile due to the X86_FEATURE_SHSTK and X86_FEATURE_IBT
dependencies.

> If this is the case, I plan to apply locally v15 and hold on it until the
> host code is committed.
> 
> Paolo
>