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Date:	Thu, 20 Sep 2007 16:53:36 -0400
From:	Bill Davidsen <>
To:	David Newall <>
CC:	Philipp Marek <>,,
	Alan Cox <>,
	majkls <>,,
Subject: Re: sys_chroot+sys_fchdir Fix

David Newall wrote:
> Philipp Marek wrote:
>> AFAIK pivot_root() changes the / mapping for *all* processes, no?
> The manual page is confusing.  It even admits to being "intentionally 
> vague".  However the goal seems clear:
>    "pivot_root() moves the root file system of the current process to
>    the directory put_old and makes new_root the new root file system of
>    the current process"
>    -- man 2 pivot_root
> There's an argument that pivot_root could be improved...
And very little argument that the man page could be improved, perhaps. 
However, there is no question that pivot_root is intended to have 
breadth for more than one process.

Keeping this functionality sounds a little like putting a bow tie and 
tux on your bug and calling it a "feature." Not all bugs are useless for 
legitimate purposes, but it doesn't make them safe. It appears to be a 
sort-of way to get per-process bind mounts.

bill davidsen <>
  CTO TMR Associates, Inc
  Doing interesting things with small computers since 1979

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