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

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Date:	Thu, 13 Aug 2015 18:43:02 +0200
From:	Borislav Petkov <bp@...e.de>
To:	yalin wang <yalin.wang2010@...il.com>
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 Thu, Aug 13, 2015 at 06:04:54PM +0800, yalin wang wrote:
> we store type into one fix register, for example r12 ,
> then in fix up code, we can know the exception is caused by copy_from
> copy_to or copy_in user function by check r12 value(0 , 1 ,2 value), then if 
> it is copy_from, we only allow read fault, if the exception is write fault, panic() .
> 
> the same rules also apply to copy_to / copy_in function .
> 
> is it possible to change it like this ?

... and we'll do all that jumping through hoops to fix what actual,
real-life problem exactly?

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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