linux-kernel - Re: [PATCH] staging: vchip

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Date:   Thu, 23 Sep 2021 20:57:40 +0800 (CST)
From:   Guo Zhi <qtxuning1999@...u.edu.cn>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     nsaenz@...nel.org, peterz@...radead.org, maz@...nel.org,
        bsegall@...gle.com, rdunlap@...radead.org, airlied@...hat.com,
        kan liang <kan.liang@...ux.intel.com>, odin@...d.al,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-staging@...ts.linux.dev,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: vchip_arm: Fix misuse of %x

We should restrict kernel pointer leakage issue by using kptr_restrict. 
Therefore kernel pointers should be specified by %pK rather than %lx.

Thanks.

Guo

----- Original Message -----
From: "Greg KH" <gregkh@...uxfoundation.org>
To: "Guo Zhi" <qtxuning1999@...u.edu.cn>
Cc: nsaenz@...nel.org, peterz@...radead.org, maz@...nel.org, bsegall@...gle.com, rdunlap@...radead.org, airlied@...hat.com, "kan liang" <kan.liang@...ux.intel.com>, odin@...d.al, bcm-kernel-feedback-list@...adcom.com, linux-rpi-kernel@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, linux-staging@...ts.linux.dev, "linux-kernel" <linux-kernel@...r.kernel.org>
Sent: Thursday, September 23, 2021 1:19:34 PM
Subject: Re: [PATCH] staging: vchip_arm: Fix misuse of %x

On Thu, Sep 23, 2021 at 11:55:54AM +0800, Guo Zhi wrote:
> Pointers should be printed with %p or %px rather than
> cast to (unsigned long) and printed with %lx.
> Change %lx to %pK to print the pointers.
> 
> Signed-off-by: Guo Zhi <qtxuning1999@...u.edu.cn>
> ---
>  .../staging/vc04_services/interface/vchiq_arm/vchiq_arm.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> index b5aac862a29..408e5fe710b 100644
> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
> @@ -591,11 +591,11 @@ service_callback(enum vchiq_reason reason, struct vchiq_header *header,
>  		return VCHIQ_SUCCESS;
>  
>  	vchiq_log_trace(vchiq_arm_log_level,
> -		"%s - service %lx(%d,%p), reason %d, header %lx, instance %lx, bulk_userdata %lx",
> -		__func__, (unsigned long)user_service,
> +		"%s - service %pK(%d,%p), reason %d, header %pK, instance %pK, bulk_userdata %pK",
> +		__func__, user_service,
>  		service->localport, user_service->userdata,
> -		reason, (unsigned long)header,
> -		(unsigned long)instance, (unsigned long)bulk_userdata);
> +		reason, header,
> +		instance, bulk_userdata);

Why print this out at all?  What uses this?  Can it just be deleted?

thanks,

greg k-h