linux-kernel - Re: [PATCH v2 2/2] tee: remove flags TEE_IOCTL_SHM_MAPPED and TEE_IOCTL_SHM_DMA

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Date:   Wed, 8 Jun 2022 17:35:18 -0500
From:   Andrew Davis <afd@...com>
To:     Eugene Syromiatnikov <esyr@...hat.com>
CC:     Jens Wiklander <jens.wiklander@...aro.org>,
        Sumit Garg <sumit.garg@...aro.org>,
        <op-tee@...ts.trustedfirmware.org>, <linux-kernel@...r.kernel.org>,
        <ldv@...ace.io>
Subject: Re: [PATCH v2 2/2] tee: remove flags TEE_IOCTL_SHM_MAPPED and
 TEE_IOCTL_SHM_DMA_BUF

On 6/8/22 8:52 AM, Eugene Syromiatnikov wrote:
> On Mon, Apr 25, 2022 at 09:16:17AM -0500, Andrew Davis wrote:
>> These look to be leftover from an early edition of this driver. Userspace
>> does not need this information. Checking all users of this that I have
>> access to I have verified no one is using them.
> 
> This change has broken build of strace's test suite against the latest kernel
> headers[1];  the usage prety much shows up in the Debian's code search[2].
> 
> [1] https://github.com/strace/strace/runs/6794205205?check_suite_focus=true#step:4:3862
> [2] https://codesearch.debian.net/search?q=TEE_IOCTL_SHM_MAPPED+package%3A%5CQstrace%5CE&literal=1
> 

Thanks for the headsup, I've sent a patch to fix strace tests.

Andrew

>> They leak internal use flags out to userspace. Even more they are not
>> correct anymore after a45ea4efa358. Lets drop these flags before
>> someone does try to use them for something and they become ABI.
>