Re: [PATCH RFC v3 03/10] openat2: explicitly return -E2BIG for (usize > PAGE_SIZE)

[Greg KH <gregkh@linuxfoundation.org>]

On Thu, Oct 10, 2024 at 07:40:36AM +1100, Aleksa Sarai wrote:
> While we do currently return -EFAULT in this case, it seems prudent to
> follow the behaviour of other syscalls like clone3. It seems quite
> unlikely that anyone depends on this error code being EFAULT, but we can
> always revert this if it turns out to be an issue.
> 
> Cc: <stable@vger.kernel.org> # v5.6+
> Fixes: fddb5d430ad9 ("open: introduce openat2(2) syscall")
> Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
> ---
>  fs/open.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/open.c b/fs/open.c
> index 22adbef7ecc2..30bfcddd505d 100644
> --- a/fs/open.c
> +++ b/fs/open.c
> @@ -1458,6 +1458,8 @@ SYSCALL_DEFINE4(openat2, int, dfd, const char __user *, filename,
>  
>  	if (unlikely(usize < OPEN_HOW_SIZE_VER0))
>  		return -EINVAL;
> +	if (unlikely(usize > PAGE_SIZE))
> +		return -E2BIG;
>  
>  	err = copy_struct_from_user(&tmp, sizeof(tmp), how, usize);
>  	if (err)
> 
> -- 
> 2.46.1

Why isn't this just sent as a normal fix to be included now and not
burried in a RFC series?

thanks,

greg k-h