linux-kernel - Re: [Linux-kernel-mentees][PATCH v2] drm/amdkfd: Fix undefined behavior in bit shift

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Date:   Wed, 26 Jun 2019 21:33:43 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Jiunn Chang <c0d1n61at3@...il.com>
Cc:     linux-kernel-mentees@...ts.linuxfoundation.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        oded.gabbay@...il.com,
        "skh >> Shuah Khan" <skhan@...uxfoundation.org>
Subject: Re: [Linux-kernel-mentees][PATCH v2] drm/amdkfd: Fix undefined
 behavior in bit shift

On 6/26/19 9:25 PM, Jiunn Chang wrote:
> Shifting signed 32-bit value by 31 bits is undefined.  Changing most
> significant bit to unsigned.
> 
> Changes included in v2:
>    - use subsystem specific subject lines
>    - CC required mailing lists
> 
> Signed-off-by: Jiunn Chang <c0d1n61at3@...il.com>
> ---

Move version change lines here.

>   include/uapi/linux/kfd_ioctl.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/uapi/linux/kfd_ioctl.h b/include/uapi/linux/kfd_ioctl.h
> index dc067ed0b72d..ae5669272303 100644
> --- a/include/uapi/linux/kfd_ioctl.h
> +++ b/include/uapi/linux/kfd_ioctl.h
> @@ -339,7 +339,7 @@ struct kfd_ioctl_acquire_vm_args {
>   #define KFD_IOC_ALLOC_MEM_FLAGS_USERPTR		(1 << 2)
>   #define KFD_IOC_ALLOC_MEM_FLAGS_DOORBELL	(1 << 3)
>   /* Allocation flags: attributes/access options */
> -#define KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE	(1 << 31)
> +#define KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE	(1U << 31)
>   #define KFD_IOC_ALLOC_MEM_FLAGS_EXECUTABLE	(1 << 30)
>   #define KFD_IOC_ALLOC_MEM_FLAGS_PUBLIC		(1 << 29)
>   #define KFD_IOC_ALLOC_MEM_FLAGS_NO_SUBSTITUTE	(1 << 28)
> 

thanks,
-- Shuah