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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: linux-sgx@vger.kernel.org,
	Shay Katz-zamir <shay.katz-zamir@intel.com>,
	Serge Ayoun <serge.ayoun@intel.com>
Subject: Re: [PATCH for_v22 05/11] x86/sgx: Require EADD source to be page aligned
Date: Thu, 8 Aug 2019 18:44:24 +0300	[thread overview]
Message-ID: <20190808154351.3jsh75ryezomussw@linux.intel.com> (raw)
In-Reply-To: <20190808001254.11926-6-sean.j.christopherson@intel.com>

On Wed, Aug 07, 2019 at 05:12:48PM -0700, Sean Christopherson wrote:
> Reject the EADD ioctl() if the source address provided by userspace is
> not page aligned.  Page alignment is required by hardware, but this is
> not enforced on userspace as the kernel first copies the source page to
> an internal (page aligned) buffer.  Require the userspace address to be
> page aligned so that the driver can, in the future, directly consume the
> userspace address via EADD without breaking backwards compatibility,
> e.g. to avoid the overhead of alloc+memcpy.
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>

Not sure about this. Why not just implement a fast path when the address is
aligned (in future)?

/Jarkko

  reply	other threads:[~2019-08-08 15:44 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-08  0:12 [PATCH for_v22 00/11] x86/sgx: Bug fixes for v22 Sean Christopherson
2019-08-08  0:12 ` [PATCH for_v22 01/11] x86/sgx: Fix an SECS collision with enclave page at VA=0 Sean Christopherson
2019-08-08 15:34   ` Jarkko Sakkinen
2019-08-08 15:44     ` Sean Christopherson
2019-08-09 15:13       ` Jarkko Sakkinen
2019-08-09 20:44   ` Jarkko Sakkinen
2019-08-09 20:59     ` Jarkko Sakkinen
2019-08-08  0:12 ` [PATCH for_v22 02/11] x86/sgx: Fix incorrect NULL pointer check Sean Christopherson
2019-08-08 15:36   ` Jarkko Sakkinen
2019-08-09 21:16     ` Jarkko Sakkinen
2019-08-08  0:12 ` [PATCH for_v22 03/11] x86/sgx: Return '0' when sgx_ioc_enclave_set_attribute() succeeds Sean Christopherson
2019-08-08 15:37   ` Jarkko Sakkinen
2019-08-08  0:12 ` [PATCH for_v22 04/11] x86/sgx: x86/sgx: Require EADD destination to be page aligned Sean Christopherson
2019-08-08 15:38   ` Jarkko Sakkinen
2019-08-08  0:12 ` [PATCH for_v22 05/11] x86/sgx: Require EADD source " Sean Christopherson
2019-08-08 15:44   ` Jarkko Sakkinen [this message]
2019-08-08  0:12 ` [PATCH for_v22 06/11] x86/sgx: Check the bounds of the enclave address against ELRANGE Sean Christopherson
2019-08-08 15:45   ` Jarkko Sakkinen
2019-08-09 21:21     ` Jarkko Sakkinen
2019-08-08  0:12 ` [PATCH for_v22 07/11] x86/sgx: Check that enclave is created at beginning of EADD/EINIT ioctl Sean Christopherson
2019-08-08 15:47   ` Jarkko Sakkinen
2019-08-09 23:40   ` Jarkko Sakkinen
2019-08-10  0:03     ` Sean Christopherson
2019-08-10  0:10       ` Sean Christopherson
2019-08-08  0:12 ` [PATCH for_v22 08/11] x86/sgx: Do not free enclave resources on redundant ECREATE Sean Christopherson
2019-08-08 15:48   ` Jarkko Sakkinen
2019-08-08  0:12 ` [PATCH for_v22 09/11] x86/sgx: Refactor error handling for user of sgx_encl_grow() Sean Christopherson
2019-08-08 15:49   ` Jarkko Sakkinen
2019-08-08  0:12 ` [PATCH for_v22 10/11] x86/sgx: Call sgx_encl_grow() with the enclave's lock held Sean Christopherson
2019-08-08 15:52   ` Jarkko Sakkinen
2019-08-08 15:55     ` Sean Christopherson
2019-08-09 16:12       ` Jarkko Sakkinen
2019-08-10 11:32   ` Jarkko Sakkinen
2019-08-08  0:12 ` [PATCH for_v22 11/11] x86/sgx: Shrink the enclave if ECREATE/EADD fails Sean Christopherson
2019-08-08 15:50   ` Jarkko Sakkinen
2019-08-08 18:03     ` Sean Christopherson
2019-08-09 16:13       ` Jarkko Sakkinen
2019-08-10 11:37       ` Jarkko Sakkinen
2019-08-08 15:18 ` [PATCH for_v22 00/11] x86/sgx: Bug fixes for v22 Jarkko Sakkinen
2019-08-08 15:57 ` Jarkko Sakkinen
2019-08-10 11:44 ` Jarkko Sakkinen

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