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From: Jarkko Sakkinen <jarkko@kernel.org>
To: Hillf Danton <hdanton@sina.com>
Cc: x86@kernel.org, linux-sgx@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Jethro Beekman <jethro@fortanix.com>,
	Serge Ayoun <serge.ayoun@intel.com>,
	akpm@linux-foundation.org
Subject: Re: [PATCH v41 10/24] mm: Add 'mprotect' hook to struct vm_operations_struct
Date: Tue, 17 Nov 2020 20:22:01 +0200
Message-ID: <20201117182201.GA10393@kernel.org> (raw)
In-Reply-To: <20201115030548.1572-1-hdanton@sina.com>

On Sun, Nov 15, 2020 at 11:05:48AM +0800, Hillf Danton wrote:
> On Fri, 13 Nov 2020 00:01:21 +0200
> > From: Sean Christopherson <sean.j.christopherson@intel.com>
> > 
> > Background
> > ==========
> > 
> > 1. SGX enclave pages are populated with data by copying from normal memory
> >    via ioctl() (SGX_IOC_ENCLAVE_ADD_PAGES), which will be added later in
> >    this series.
> > 2. It is desirable to be able to restrict those normal memory data sources.
> >    For instance, to ensure that the source data is executable before
> >    copying data to an executable enclave page.
> > 3. Enclave page permissions are dynamic (just like normal permissions) and
> >    can be adjusted at runtime with mprotect().
> > 
> > This creates a problem because the original data source may have long since
> > vanished at the time when enclave page permissions are established (mmap()
> > or mprotect()).
> > 
> > The solution (elsewhere in this series) is to force enclaves creators to
> > declare their paging permission *intent* up front to the ioctl().  This
> > intent can be immediately compared to the source data’s mapping and
> > rejected if necessary.
> > 
> > The “intent” is also stashed off for later comparison with enclave
> > PTEs. This ensures that any future mmap()/mprotect() operations
> > performed by the enclave creator or done on behalf of the enclave
> > can be compared with the earlier declared permissions.
> > 
> > Problem
> > =======
> > 
> > There is an existing mmap() hook which allows SGX to perform this
> > permission comparison at mmap() time.  However, there is no corresponding
> > ->mprotect() hook.
> > 
> > Solution
> > ========
> > 
> > Add a vm_ops->mprotect() hook so that mprotect() operations which are
> > inconsistent with any page's stashed intent can be rejected by the driver.
> > 
> > Cc: linux-mm@kvack.org
> > Cc: Andrew Morton <akpm@linux-foundation.org>
> > Cc: Matthew Wilcox <willy@infradead.org>
> > Cc: Mel Gorman <mgorman@techsingularity.net>
> > Acked-by: Jethro Beekman <jethro@fortanix.com> # v40
> > Acked-by: Dave Hansen <dave.hansen@intel.com> # v40
> > # Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> > Co-developed-by: Jarkko Sakkinen <jarkko@kernel.org>
> > Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
> > ---
> 
> Acked-by: Hillf Danton <hdanton@sina.com>

Thank you.

/Jarkko

  parent reply index

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-12 22:01 [PATCH v41 00/24] Intel SGX foundations Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 01/24] x86/sgx: Add SGX architectural data structures Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 02/24] x86/sgx: Add wrappers for ENCLS functions Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 03/24] x86/cpufeatures: x86/msr: Add Intel SGX hardware bits Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 04/24] x86/cpufeatures: x86/msr: Add Intel SGX Launch Control " Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 05/24] x86/sgx: Initialize metadata for Enclave Page Cache (EPC) sections Jarkko Sakkinen
2020-11-16 22:25   ` [PATCH] x86/sgx: clarify 'laundry_list' locking Dave Hansen
2020-11-17 19:29     ` Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 06/24] x86/mm: x86/sgx: Signal SIGSEGV with PF_SGX Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 07/24] x86/cpu/intel: Detect SGX support Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 08/24] x86/cpu/intel: Add nosgx kernel parameter Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 09/24] x86/sgx: Add SGX page allocator functions Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 10/24] mm: Add 'mprotect' hook to struct vm_operations_struct Jarkko Sakkinen
2020-11-13 10:25   ` Mel Gorman
2020-11-17 18:16     ` Jarkko Sakkinen
2020-11-15 17:08   ` Dr. Greg
2020-11-15 17:32   ` Matthew Wilcox
2020-11-15 18:36     ` Dave Hansen
2020-11-16 10:09       ` Mel Gorman
2020-11-17 19:15         ` Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 11/24] x86/sgx: Add SGX misc driver interface Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 12/24] x86/sgx: Add SGX_IOC_ENCLAVE_CREATE Jarkko Sakkinen
     [not found]   ` <20201115044044.11040-1-hdanton@sina.com>
2020-11-17 17:35     ` Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 13/24] x86/sgx: Add SGX_IOC_ENCLAVE_ADD_PAGES Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 14/24] x86/sgx: Add SGX_IOC_ENCLAVE_INIT Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 15/24] x86/sgx: Add SGX_IOC_ENCLAVE_PROVISION Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 16/24] x86/vdso: Add support for exception fixup in vDSO functions Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 17/24] x86/fault: Add helper function to sanitize error code Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 18/24] x86/traps: Attempt to fixup exceptions in vDSO before signaling Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 19/24] x86/vdso: Implement a vDSO for Intel SGX enclave call Jarkko Sakkinen
2020-11-17 13:14   ` Borislav Petkov
2020-11-17 19:41     ` Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 20/24] selftests/x86: Add a selftest for SGX Jarkko Sakkinen
2020-11-16 18:19   ` Shuah Khan
2020-11-17 13:22     ` Borislav Petkov
2020-11-17 19:42     ` Jarkko Sakkinen
2020-11-17 17:26   ` Borislav Petkov
2020-11-17 21:27     ` Jarkko Sakkinen
2020-11-17 21:38     ` Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 21/24] x86/sgx: Add a page reclaimer Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 22/24] x86/sgx: Add ptrace() support for the SGX driver Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 23/24] docs: x86/sgx: Document SGX kernel architecture Jarkko Sakkinen
2020-11-12 22:01 ` [PATCH v41 24/24] x86/sgx: Update MAINTAINERS Jarkko Sakkinen
2020-11-16 16:55 ` [PATCH v41 00/24] Intel SGX foundations Borislav Petkov
2020-11-16 17:21   ` Dave Hansen
2020-11-16 17:28     ` Borislav Petkov
2020-11-17 19:20       ` Jarkko Sakkinen
     [not found] ` <20201114084211.5284-1-hdanton@sina.com>
2020-11-16 18:33   ` [PATCH v41 05/24] x86/sgx: Initialize metadata for Enclave Page Cache (EPC) sections Dave Hansen
     [not found] ` <20201115040127.7804-1-hdanton@sina.com>
2020-11-16 21:11   ` [PATCH v41 11/24] x86/sgx: Add SGX misc driver interface Dave Hansen
     [not found] ` <20201114090708.8684-1-hdanton@sina.com>
2020-11-17 18:12   ` [PATCH v41 06/24] x86/mm: x86/sgx: Signal SIGSEGV with PF_SGX Jarkko Sakkinen
     [not found] ` <20201114093256.7800-1-hdanton@sina.com>
2020-11-17 18:14   ` [PATCH v41 09/24] x86/sgx: Add SGX page allocator functions Jarkko Sakkinen
     [not found] ` <20201115030548.1572-1-hdanton@sina.com>
2020-11-17 18:22   ` Jarkko Sakkinen [this message]
2020-12-15  5:38 ` [PATCH v41 00/24] Intel SGX foundations Hui, Chunyang
2020-12-15  5:43 ` Hui, Chunyang
2020-12-15 15:58   ` Jarkko Sakkinen

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