linux-kernel - Re: [PATCH v2 2/4] fs/proc/task_mmu: Implement IOCTL to get and clear soft dirty PTE bit

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Message-ID: <Ywci73JxlWGCMnrK@kroah.com>
Date:   Thu, 25 Aug 2022 09:21:19 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Muhammad Usama Anjum <usama.anjum@...labora.com>
Cc:     Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:PROC FILESYSTEM" <linux-fsdevel@...r.kernel.org>,
        "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>, kernel@...labora.com
Subject: Re: [PATCH v2 2/4] fs/proc/task_mmu: Implement IOCTL to get and
 clear soft dirty PTE bit

On Thu, Aug 25, 2022 at 12:09:24PM +0500, Muhammad Usama Anjum wrote:
> diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
> index b7b56871029c..a7e48ba9457b 100644
> --- a/include/uapi/linux/fs.h
> +++ b/include/uapi/linux/fs.h
> @@ -305,4 +305,17 @@ typedef int __bitwise __kernel_rwf_t;
>  #define RWF_SUPPORTED	(RWF_HIPRI | RWF_DSYNC | RWF_SYNC | RWF_NOWAIT |\
>  			 RWF_APPEND)
>  
> +struct pagemap_sd_args {
> +	void __user *start;
> +	int len;

"int" is not a valid type to cross the user/kernel boundry, sorry.
Please be explicit here (__u64?  __u32?)

> +	loff_t __user *vec;
> +	int vec_len;
> +	int flags;

Same with these.

thanks,

greg k-h