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

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Message-ID: <CAFA6WYPK2NS08pdzqS5Ze5pdJic2iQ7hC6h0SK+JT=EbPkg+Sg@mail.gmail.com>
Date:   Mon, 25 Apr 2022 12:16:41 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     Andrew Davis <afd@...com>
Cc:     Jens Wiklander <jens.wiklander@...aro.org>,
        op-tee@...ts.trustedfirmware.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] tee: remove flags TEE_IOCTL_SHM_MAPPED and TEE_IOCTL_SHM_DMA_BUF

On Fri, 22 Apr 2022 at 23:31, Andrew Davis <afd@...com> 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.
>
> 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.
>

Sounds reasonable to me.

> Signed-off-by: Andrew Davis <afd@...com>
> ---
>  drivers/tee/tee_core.c   | 1 -
>  include/uapi/linux/tee.h | 4 ----
>  2 files changed, 5 deletions(-)
>
> diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
> index 8aa1a4836b92f..650dd87a38e77 100644
> --- a/drivers/tee/tee_core.c
> +++ b/drivers/tee/tee_core.c
> @@ -339,7 +339,6 @@ tee_ioctl_shm_register(struct tee_context *ctx,
>                 return PTR_ERR(shm);
>
>         data.id = shm->id;
> -       data.flags = shm->flags;
>         data.length = shm->size;
>

This change is required for tee_ioctl_shm_alloc() as well.

-Sumit

>         if (copy_to_user(udata, &data, sizeof(data)))
> diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h
> index 25a6c534beb1b..23e57164693c4 100644
> --- a/include/uapi/linux/tee.h
> +++ b/include/uapi/linux/tee.h
> @@ -42,10 +42,6 @@
>  #define TEE_IOC_MAGIC  0xa4
>  #define TEE_IOC_BASE   0
>
> -/* Flags relating to shared memory */
> -#define TEE_IOCTL_SHM_MAPPED   0x1     /* memory mapped in normal world */
> -#define TEE_IOCTL_SHM_DMA_BUF  0x2     /* dma-buf handle on shared memory */
> -
>  #define TEE_MAX_ARG_SIZE       1024
>
>  #define TEE_GEN_CAP_GP         (1 << 0)/* GlobalPlatform compliant TEE */
> --
> 2.17.1
>