69 lines
2.6 KiB
Groff
69 lines
2.6 KiB
Groff
.\" $NetBSD: fsirand.8,v 1.3 1998/06/08 12:41:43 lukem Exp $
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.\"
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.\" Copyright (c) 1997 Christos Zoulas
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by Christos Zoulas.
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd March 7, 1997
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.Dt FSIRAND 8
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.Os
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.Sh NAME
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.Nm fsirand
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.Nd install random inode generation numbers in a filesystem
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.Sh SYNOPSIS
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.Nm
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.Op Fl x Ar constant
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.Op Fl p
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.Ar special
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.Sh DESCRIPTION
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.Nm
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writes random inode generation numbers for all the inodes on device
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.Ar special .
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These random numbers make the NFS filehandles less predictable, increasing
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security of exported filesystems.
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.Pp
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.Nm
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should be run on a clean and unmounted filesystem.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl x Ar constant
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Exclusive-or the given constant with the random number used in the generation
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process.
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.It Fl p
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Print the current inode generation numbers; the filesystem is not modified.
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.El
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.Pp
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.Nm
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exits zero on success, non-zero on failure.
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.Sh SEE ALSO
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.Xr fsck_ffs 8 ,
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.Xr newfs 8
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.Sh SECURITY CONSIDERATIONS
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The current implementation does not use a good random number generator,
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so the randomization can be predicted.
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