linux-kernel - Re: [x86, vdso] BUG: unable to handle kernel paging request at d34bd000

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Date:	Mon, 10 Mar 2014 10:48:32 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Stefani Seibold <stefani@...bold.net>,
	Andreas Brief <Andreas.Brief@...de-schwarz.com>,
	Martin Runge <Martin.Runge@...de-schwarz.com>
Subject: Re: [x86, vdso] BUG: unable to handle kernel paging request at d34bd000

On 03/10/2014 10:46 AM, Andy Lutomirski wrote:
>>
>> Yes, we'd have to switch the vdso to using syscall access.  Doing that
>> from inside a system call is... "interesting".
> 
> It's a little less interesting if it just involves changing a vma.
> It's still tricky, though -- would each struct mm have its own struct
> file for the vvar page?  Can this be done with some
> vm_operations_struct magic?  There are possible races, too, though --
> another thread could access the thing concurrently with a syscall.
> 

Hint: where is your RIP?  Where is the RIP of other processes?

	-hpa

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