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From: Andy Lutomirski <luto@kernel.org>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: X86 ML <x86@kernel.org>,
	linux-sgx@vger.kernel.org,  LKML <linux-kernel@vger.kernel.org>,
	 Sean Christopherson <sean.j.christopherson@intel.com>,
	Linux-MM <linux-mm@kvack.org>,
	 Andrew Morton <akpm@linux-foundation.org>,
	Matthew Wilcox <willy@infradead.org>,
	 Jethro Beekman <jethro@fortanix.com>,
	Darren Kenny <darren.kenny@oracle.com>,
	 Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	asapek@google.com,  Borislav Petkov <bp@alien8.de>,
	"Xing, Cedric" <cedric.xing@intel.com>,
	chenalexchen@google.com,  Conrad Parker <conradparker@google.com>,
	cyhanish@google.com,  Dave Hansen <dave.hansen@intel.com>,
	"Huang, Haitao" <haitao.huang@intel.com>,
	 Josh Triplett <josh@joshtriplett.org>,
	"Huang, Kai" <kai.huang@intel.com>,
	 "Svahn, Kai" <kai.svahn@intel.com>,
	Keith Moyer <kmoy@google.com>,
	 Christian Ludloff <ludloff@google.com>,
	Andrew Lutomirski <luto@kernel.org>,
	Neil Horman <nhorman@redhat.com>,
	 Nathaniel McCallum <npmccallum@redhat.com>,
	Patrick Uiterwijk <puiterwijk@redhat.com>,
	 David Rientjes <rientjes@google.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	yaozhangx@google.com
Subject: Re: [PATCH v38 10/24] mm: Add vm_ops->mprotect()
Date: Fri, 18 Sep 2020 08:09:04 -0700	[thread overview]
Message-ID: <CALCETrX9T1ZUug=M5ba9g4H5B7kV=yL5RzuTaeAEdy3uAieN_A@mail.gmail.com> (raw)
In-Reply-To: <20200915112842.897265-11-jarkko.sakkinen@linux.intel.com>

On Tue, Sep 15, 2020 at 4:28 AM Jarkko Sakkinen
<jarkko.sakkinen@linux.intel.com> wrote:
>
> From: Sean Christopherson <sean.j.christopherson@intel.com>
>
> Add vm_ops()->mprotect() for additional constraints for a VMA.
>
> Intel Software Guard eXtensions (SGX) will use this callback to add two
> constraints:
>
> 1. Verify that the address range does not have holes: each page address
>    must be filled with an enclave page.
> 2. Verify that VMA permissions won't surpass the permissions of any enclave
>    page within the address range. Enclave cryptographically sealed
>    permissions for each page address that set the upper limit for possible
>    VMA permissions. Not respecting this can cause #GP's to be emitted.

It's been awhile since I looked at this.  Can you remind us: is this
just preventing userspace from shooting itself in the foot or is this
something more important?

--Andy


  parent reply	other threads:[~2020-09-18 15:09 UTC|newest]

Thread overview: 81+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200915112842.897265-1-jarkko.sakkinen@linux.intel.com>
2020-09-15 11:28 ` [PATCH v38 10/24] mm: Add vm_ops->mprotect() Jarkko Sakkinen
2020-09-18 12:44   ` Borislav Petkov
2020-09-18 15:09   ` Andy Lutomirski [this message]
2020-09-18 23:24     ` [PATCH v38 10/24] mm: Add vm_ops->mprotect()' Jarkko Sakkinen
2020-09-18 23:53     ` [PATCH v38 10/24] mm: Add vm_ops->mprotect() Sean Christopherson
2020-09-19  0:15       ` Andy Lutomirski
2020-09-22 12:58         ` Jarkko Sakkinen
2020-09-22 15:11           ` Dave Hansen
2020-09-23 13:30             ` Jarkko Sakkinen
2020-09-23 13:43             ` Jarkko Sakkinen
2020-09-23 14:33             ` Jarkko Sakkinen
2020-09-24 14:50               ` Dave Hansen
2020-09-24 16:27                 ` Sean Christopherson
2020-09-24 19:35                 ` Jarkko Sakkinen
2020-09-21 12:49       ` Jarkko Sakkinen
2020-09-21 12:51         ` Jarkko Sakkinen
2020-09-21 13:14         ` Jarkko Sakkinen
2020-09-21 16:57         ` Sean Christopherson
2020-09-21 21:07           ` Jarkko Sakkinen
2020-09-21 21:18             ` Sean Christopherson
2020-09-22  5:29               ` Jarkko Sakkinen
2020-09-22  5:35                 ` Jarkko Sakkinen
2020-09-22 16:43                   ` Sean Christopherson
2020-09-23 13:50                     ` Jarkko Sakkinen
2020-09-24 19:11                       ` Haitao Huang
2020-09-24 19:28                         ` Sean Christopherson
2020-09-24 19:39                           ` Dave Hansen
2020-09-24 20:01                             ` Sean Christopherson
2020-09-24 20:10                               ` Dave Hansen
2020-09-24 20:25                                 ` Sean Christopherson
2020-09-24 20:54                                   ` Dave Hansen
2020-09-24 22:10                                     ` Jarkko Sakkinen
2020-09-24 23:05                                     ` Sean Christopherson
2020-09-24 23:09                                       ` Dave Hansen
2020-09-25  0:00                                         ` Sean Christopherson
2020-09-25 17:18                                           ` Dave Hansen
2020-09-25 19:43                                             ` Sean Christopherson
2020-09-25 19:53                                               ` Dave Hansen
2020-09-26  4:15                                                 ` Andy Lutomirski
2020-09-28  0:53                                                 ` Jarkko Sakkinen
2020-09-28 14:04                                                   ` Dave Hansen
2020-09-28 16:19                                                     ` Jarkko Sakkinen
2020-09-28 16:48                                                       ` Dave Hansen
2020-09-28 19:32                                                         ` Jarkko Sakkinen
2020-09-28 19:45                                                           ` Dave Hansen
2020-09-28 20:19                                                             ` Jarkko Sakkinen
2020-09-29  1:37                                                               ` Andy Lutomirski
2020-09-29  4:05                                                                 ` Jarkko Sakkinen
2020-09-29 14:24                                                                   ` Dave Hansen
2020-09-30  0:20                                                                     ` Jarkko Sakkinen
2020-09-30 14:35                                                                       ` Dave Hansen
2020-09-28 20:18                                                         ` Jarkko Sakkinen
2020-10-18  8:49                                                     ` Dr. Greg
2020-10-19 21:31                                                       ` Sean Christopherson
2020-10-20 10:01                                                         ` Dr. Greg
2020-10-20 16:40                                                           ` Sean Christopherson
2020-10-24 14:37                                                             ` Dr. Greg
2020-10-24 15:33                                                               ` Andy Lutomirski
2020-10-26 10:51                                                                 ` Dr. Greg
2020-10-26 22:59                                                                   ` Andy Lutomirski
2020-10-27  0:40                                                                     ` Sean Christopherson
2020-09-24 22:07                                 ` Jarkko Sakkinen
2020-09-24 21:58                           ` Jarkko Sakkinen
2020-09-24 21:55                         ` Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 11/24] x86/sgx: Add SGX enclave driver Jarkko Sakkinen
2020-09-21  9:30   ` Borislav Petkov
2020-09-21 12:09     ` Jarkko Sakkinen
2020-10-01 17:36   ` Sean Christopherson
2020-10-01 18:49     ` Jarkko Sakkinen
2020-09-15 11:28 ` [PATCH v38 16/24] x86/sgx: Add a page reclaimer Jarkko Sakkinen
2020-09-22 10:45   ` Borislav Petkov
2020-09-22 14:03     ` Jarkko Sakkinen
2020-09-22 14:24       ` Borislav Petkov
2020-09-23 14:52         ` Jarkko Sakkinen
2020-09-29  1:14       ` Sean Christopherson
2020-09-29  3:50         ` Jarkko Sakkinen
2020-09-29  8:35           ` Sean Christopherson
2020-09-22 16:24     ` Sean Christopherson
2020-09-22 18:02       ` Borislav Petkov
2020-09-23 15:25       ` Jarkko Sakkinen
     [not found] <20200915110522.893152-1-jarkko.sakkinen@linux.intel.com>
2020-09-15 11:05 ` [PATCH v38 10/24] mm: Add vm_ops->mprotect() Jarkko Sakkinen

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