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Date:	Wed, 08 Apr 2015 12:31:40 +0200
From:	David Macek <david DOT macek DOT 0 AT gmail DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Re: setfacl can kill a drive
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Content-Type: text/plain; charset=utf-8
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On 8. 4. 2015 12:17, Steven Penny wrote:
> Also I discovered this
>=20
>     $ setfacl -b /cygdrive/c
>=20
> After that you get this
>=20
>     C:\ is not accessible.
>     Access is denied.
>=20
> Luckily this was in a virtual machine. Otherwise, can this be undone? Thi=
s is
> very dangerous, and I feel it should be protected similarly to
> "rm --no-preserve-root"

The root of the C drive should be easy to fix, as most of the directories t=
here don't inherit its permissions. You should be able to use Windows Explo=
rer to fix the permissions, but maybe takeown and icacls will be more preci=
se tools for this task. This is the ACL for my C root:

C:\> icacls .
. NT AUTHORITY\SYSTEM:(OI)(CI)(F)
  BUILTIN\Administrators:(OI)(CI)(F)
  NT AUTHORITY\Authenticated Users:(OI)(CI)(RX)
  BUILTIN\Users:(OI)(CI)(RX)
  Mandatory Label\High Mandatory Level:(OI)(NP)(IO)(NW)

--=20
David Macek


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