linux-kernel - Re: [PATCH 10/18] maccess: unify the probe kernel arch hooks

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Date:   Tue, 19 May 2020 07:46:06 +0200
From:   Christoph Hellwig <hch@....de>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Christoph Hellwig <hch@....de>, x86@...nel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-parisc@...r.kernel.org, linux-um@...ts.infradead.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/18] maccess: unify the probe kernel arch hooks

On Thu, May 14, 2020 at 10:13:18AM +0900, Masami Hiramatsu wrote:
> > +		bool strict)
> >  {
> >  	long ret;
> >  	mm_segment_t old_fs = get_fs();
> >  
> > +	if (!probe_kernel_read_allowed(dst, src, size, strict))
> > +		return -EFAULT;
> 
> Could you make this return -ERANGE instead of -EFAULT so that
> the caller can notice that the address might be user space?

That is clearly a behavior change, so I don't want to mix it into
this patch.  But I can add it as another patch at the end.