linux-kernel - Re: [PATCH v20 00/28] Intel SGX1 support

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Message-ID: <43aa8fdd-e777-74cb-e3f0-d36805ffa18b@fortanix.com>
Date:   Fri, 19 Apr 2019 19:38:19 +0000
From:   Jethro Beekman <jethro@...tanix.com>
To:     Andy Lutomirski <luto@...nel.org>, "Dr. Greg" <greg@...ellic.com>
CC:     Dave Hansen <dave.hansen@...el.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Christopherson, Sean J" <sean.j.christopherson@...el.com>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "npmccallum@...hat.com" <npmccallum@...hat.com>,
        "Ayoun, Serge" <serge.ayoun@...el.com>,
        "Katz-zamir, Shay" <shay.katz-zamir@...el.com>,
        "Huang, Haitao" <haitao.huang@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Svahn, Kai" <kai.svahn@...el.com>, Borislav Petkov <bp@...en8.de>,
        Josh Triplett <josh@...htriplett.org>,
        "Huang, Kai" <kai.huang@...el.com>,
        David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH v20 00/28] Intel SGX1 support

On 2019-04-19 08:27, Andy Lutomirski wrote:
> There are many,
> many Linux systems that enforce a policy that *all* executable text
> needs to come from a verified source.  On these systems, you can't
> mmap some writable memory, write to it, and then change it to
> executable.

How is this implemented on those systems? AFAIK there's no kernel config
option that changes the semantics of mmap as you describe.

--
Jethro Beekman | Fortanix