linux-kernel - Re: [RFC] Randomness on confidential computing platforms

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Message-ID: <82842879-FD34-4652-9714-AEE1F237EFF4@zytor.com>
Date: Mon, 29 Jan 2024 08:37:15 -0800
From: "H. Peter Anvin" <hpa@...or.com>
To: Dave Hansen <dave.hansen@...el.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "Theodore Ts'o" <tytso@....edu>,
        "Jason A. Donenfeld" <Jason@...c4.com>
CC: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        "Kalra, Ashish" <ashish.kalra@....com>,
        Sean Christopherson <seanjc@...gle.com>, linux-coco@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC] Randomness on confidential computing platforms

On January 29, 2024 8:30:11 AM PST, Dave Hansen <dave.hansen@...el.com> wrote:
>On 1/26/24 05:42, Kirill A. Shutemov wrote:
>> 3. Panic after enough re-tries of RDRAND/RDSEED instructions fail.
>>    Another DoS variant against the Guest.
>
>I think Sean was going down the same path, but I really dislike the idea
>of having TDX-specific (or CoCo-specific) policy here.
>
>How about we WARN_ON() RDRAND/RDSEED going bonkers?  The paranoid folks
>can turn on panic_on_warn, if they haven't already.

That would be good anyway.