linux-kernel - Re: [x86] copy_from{to}

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Date:	Thu, 20 Aug 2015 16:58:50 +0800
From:	yalin wang <yalin.wang2010@...il.com>
To:	Borislav Petkov <bp@...e.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org,
	open list <linux-kernel@...r.kernel.org>,
	Will Deacon <will.deacon@....com>
Subject: Re: [x86] copy_from{to}_user question


> On Aug 17, 2015, at 12:16, Borislav Petkov <bp@...e.de> wrote:
> 
> On Mon, Aug 17, 2015 at 11:27:01AM +0800, yalin wang wrote:
>> i just want the x86 copy_from{to,in}_user() function have 
>> the same behaviour as other platforms.
> 
> Back to the original question from 2 mails ago:
> 
> How else would we be able to use the same function in copy_to and
> copy_from variants?
> 
>> and can disclose potential BUGs in kernel, if do like this.
> 
> Back to my other question:
> 
> Do you have any real life examples where you can trigger such bugs or is
> this only "potential"?
> 
> IOW, what I *think* you're trying to do sounds to me like unnecessary
> complication with no apparent gain *at* *all*. So show me why you want
> to do it: code it up, trigger a bug and show me why your version is
> better. No "but but it might be a good idea", no "potentially maybe",
> none of that maybe stuff. Write it, send it with instructions how
> someone else can apply it and trigger the issue. Ok?
> 
> 
i will loop you in a patch mail, for kcore driver rely on x86 copy_to_user()
feature like this , but not true on other platforms .

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