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

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Message-ID: <531DFB33.4030102@linux.intel.com>
Date:	Mon, 10 Mar 2014 10:49:39 -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:
> 
> It might be nice in general for there to be a /dev/vdso and for the
> vdso to literally be a mapping of that device node.  I bet that CRIU
> would appreciate this.  (The mmap flags would be a little odd, since
> different pages have different protections.)
> 

Actually, it presumably ought to be handled like any other (readonly)
ELF file: that is, let the mapper handle the permissions.

	-hpa

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