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From: Jason Gunthorpe <jgg@ziepe.ca>
To: Tadeusz Struk <tadeusz.struk@intel.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] tpm: add support for partial reads
Date: Mon, 23 Jul 2018 20:05:54 -0600	[thread overview]
Message-ID: <20180724020554.GL532@ziepe.ca> (raw)
In-Reply-To: <ee0f0ccf-f757-a7d4-bf55-316f81fb490b@intel.com>

On Mon, Jul 23, 2018 at 04:42:38PM -0700, Tadeusz Struk wrote:
> On 07/23/2018 03:08 PM, Jason Gunthorpe wrote:
> > On Mon, Jul 23, 2018 at 03:00:20PM -0700, Tadeusz Struk wrote:
> >> On 07/23/2018 02:56 PM, Jason Gunthorpe wrote:
> >>> The proposed patch doesn't clear the data_pending if the entire buffer
> >>> is not consumed, so of course it is ABI breaking, that really isn't OK.
> >> The data_pending will be cleared by the timeout handler if the user doesn't
> >> read the response fully before the timeout expires. The is the same situation
> >> if the user would not read the response at all.
> > That causes write() to fail with EBUSY
> > 
> > NAK from me on breaking the ABI like this
> 
> What if we introduce this new behavior only for the non-blocking mode
> as James suggested? Or do you have some other suggestions?

I think you should do it entirely in userspace.

But something sensible linked to O_NONBLOCK could be OK.

Jason

  reply	other threads:[~2018-07-24  2:06 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-19 15:52 [PATCH] tpm: add support for partial reads Tadeusz Struk
2018-07-19 15:55 ` Tadeusz Struk
2018-07-19 17:19 ` James Bottomley
2018-07-19 17:54   ` Tadeusz Struk
2018-07-19 18:47     ` James Bottomley
2018-07-19 19:05       ` Tadeusz Struk
2018-07-19 19:52         ` James Bottomley
2018-07-19 20:12           ` Tadeusz Struk
2018-07-19 20:27             ` James Bottomley
2018-07-19 21:01               ` Tadeusz Struk
2018-07-23 20:19 ` Jarkko Sakkinen
2018-07-23 20:53   ` Tadeusz Struk
2018-07-23 21:13     ` James Bottomley
2018-07-23 21:38       ` Tadeusz Struk
2018-07-23 21:56         ` Jason Gunthorpe
2018-07-23 22:00           ` Tadeusz Struk
2018-07-23 22:08             ` Jason Gunthorpe
2018-07-23 23:42               ` Tadeusz Struk
2018-07-24  2:05                 ` Jason Gunthorpe [this message]
2018-07-23 21:48 ` Jason Gunthorpe

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