linux-kernel - Re: [PATCH v4 03/11] misc: fastrpc: Copy the complete capability structure to user

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Date: Fri, 7 Jun 2024 14:42:17 +0200
From: Caleb Connolly <caleb.connolly@...aro.org>
To: Ekansh Gupta <quic_ekangupt@...cinc.com>, srinivas.kandagatla@...aro.org,
 linux-arm-msm@...r.kernel.org
Cc: gregkh@...uxfoundation.org, quic_bkumar@...cinc.com,
 linux-kernel@...r.kernel.org, quic_chennak@...cinc.com,
 stable <stable@...nel.org>
Subject: Re: [PATCH v4 03/11] misc: fastrpc: Copy the complete capability
 structure to user



On 06/06/2024 18:59, Ekansh Gupta wrote:
> User is passing capability ioctl structure(argp) to get DSP
> capabilities. This argp is copied to a local structure to get domain
> and attribute_id information. After getting the capability, only
> capability value is getting copied to user argp which will not be
> useful if the use is trying to get the capability by checking the
> capability member of fastrpc_ioctl_capability structure. Add changes
> to copy the complete capability structure so that user can get the
> capability value from the expected member of the structure.
> 
> Fixes: 6c16fd8bdd40 ("misc: fastrpc: Add support to get DSP capabilities")
> Cc: stable <stable@...nel.org>
> Signed-off-by: Ekansh Gupta <quic_ekangupt@...cinc.com>

Reviewed-by: Caleb Connolly <caleb.connolly@...aro.org>
> ---
>   drivers/misc/fastrpc.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index abf7df7c0c85..f64781c3012f 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -1784,7 +1784,7 @@ static int fastrpc_get_dsp_info(struct fastrpc_user *fl, char __user *argp)
>   	if (err)
>   		return err;
>   
> -	if (copy_to_user(argp, &cap.capability, sizeof(cap.capability)))
> +	if (copy_to_user(argp, &cap, sizeof(cap)))
>   		return -EFAULT;
>   
>   	return 0;

-- 
// Caleb (they/them)