linux-kernel - Re: [PATCH, RFC 45/62] mm: Add the encrypt

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Message-ID: <20190618091246.GM3436@hirez.programming.kicks-ass.net>
Date:   Tue, 18 Jun 2019 11:12:46 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Kai Huang <kai.huang@...ux.intel.com>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        X86 ML <x86@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        David Howells <dhowells@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Linux-MM <linux-mm@...ck.org>, kvm list <kvm@...r.kernel.org>,
        keyrings@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [PATCH, RFC 45/62] mm: Add the encrypt_mprotect() system call
 for MKTME

On Tue, Jun 18, 2019 at 02:23:31PM +1200, Kai Huang wrote:
> Assuming I am understanding the context correctly, yes from this perspective it seems having
> sys_encrypt is annoying, and having ENCRYPT_ME should be better. But Dave said "nobody is going to
> do what you suggest in the ptr1/ptr2 example"? 

You have to phrase that as: 'nobody who knows what he's doing is going
to do that', which leaves lots of people and fuzzers.

Murphy states that if it is possible, someone _will_ do it. And this
being something that causes severe data corruption on persistent
storage,...