linux-kernel - Re: [PATCH v1 2/9] staging: android: binder: Add binder_copy_to

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Message-ID: <20131205083637.GV28413@mwanda>
Date:	Thu, 5 Dec 2013 11:36:37 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Serban Constantinescu <serban.constantinescu@....com>
Cc:	gregkh@...uxfoundation.org, arve@...roid.com,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	john.stultz@...aro.org, ccross@...roid.com, Dave.Butcher@....com,
	irogers@...gle.com, romlem@...roid.com
Subject: Re: [PATCH v1 2/9] staging: android: binder: Add
 binder_copy_to_user()

On Wed, Dec 04, 2013 at 06:09:34PM +0000, Serban Constantinescu wrote:
> This patch adds binder_copy_to_user() to be used for copying binder
> commands to user address space. This way we can abstract away the
> copy_to_user() calls and add separate handling for the compat layer.
> 
> Signed-off-by: Serban Constantinescu <serban.constantinescu@....com>
> ---
>  drivers/staging/android/binder.c |   39 ++++++++++++++++++++------------------
>  1 file changed, 21 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c
> index 233889c..6fbb340 100644
> --- a/drivers/staging/android/binder.c
> +++ b/drivers/staging/android/binder.c
> @@ -2117,6 +2117,18 @@ static int binder_has_thread_work(struct binder_thread *thread)
>  		(thread->looper & BINDER_LOOPER_STATE_NEED_RETURN);
>  }
>  
> +static int binder_copy_to_user(uint32_t cmd, void *parcel,
> +			       void __user **ptr, size_t size)
> +{

Bike shedding:  Put the **ptr as the first argument.
binder_copy_to_user(dest, cmd, src, size);

> +	if (put_user(cmd, (uint32_t __user *)*ptr))
> +		return -EFAULT;
> +	*ptr += sizeof(uint32_t);
> +	if (copy_to_user(*ptr, parcel, size))
> +		return -EFAULT;
> +	*ptr += size;
> +	return 0;
> +}

regards,
dan carpenter


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