linux-kernel - Re: [PATCH] userfaultfd: fix return error if mmap

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Date: Thu, 25 Jan 2024 11:37:49 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Lokesh Gidra <lokeshgidra@...gle.com>
Cc: akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	selinux@...r.kernel.org, surenb@...gle.com, kernel-team@...roid.com,
	aarcange@...hat.com, peterx@...hat.com, david@...hat.com,
	axelrasmussen@...gle.com, bgeffon@...gle.com, willy@...radead.org,
	jannh@...gle.com, kaleshsingh@...gle.com, ngeoffray@...gle.com
Subject: Re: [PATCH] userfaultfd: fix return error if mmap_changing is
 non-zero in MOVE ioctl

On Wed, Jan 17, 2024 at 02:39:21PM -0800, Lokesh Gidra wrote:
> To be consistent with other uffd ioctl's returning EAGAIN when
> mmap_changing is detected, we should change UFFDIO_MOVE to do the same.
> 
> Signed-off-by: Lokesh Gidra <lokeshgidra@...gle.com>

Acked-by: Mike Rapoport (IBM) <rppt@...nel.org>

> ---
>  fs/userfaultfd.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
> index 959551ff9a95..05c8e8a05427 100644
> --- a/fs/userfaultfd.c
> +++ b/fs/userfaultfd.c
> @@ -2047,7 +2047,7 @@ static int userfaultfd_move(struct userfaultfd_ctx *ctx,
>  			ret = move_pages(ctx, mm, uffdio_move.dst, uffdio_move.src,
>  					 uffdio_move.len, uffdio_move.mode);
>  		else
> -			ret = -EINVAL;
> +			ret = -EAGAIN;
>  
>  		mmap_read_unlock(mm);
>  		mmput(mm);
> -- 
> 2.43.0.429.g432eaa2c6b-goog
> 
> 

-- 
Sincerely yours,
Mike.