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

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Date: Wed, 17 Jan 2024 14:46:22 -0800
From: Suren Baghdasaryan <surenb@...gle.com>
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, 
	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 2:39 PM Lokesh Gidra <lokeshgidra@...gle.com> 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>

Looks correct. Thanks for catching it!

Acked-by: Suren Baghdasaryan <surenb@...gle.com>

> ---
>  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
>