From: "H. Peter Anvin" <hpa@zytor.com>
To: linux-kernel@vger.kernel.org
Subject: Re: pivot_root off an initramfs broken
Date: 3 Dec 2003 16:30:58 -0800 [thread overview]
Message-ID: <bqlv82$nms$1@cesium.transmeta.com> (raw)
In-Reply-To: 1070496272.8280.443.camel@plato.i.bork.org
Followup to: <1070496272.8280.443.camel@plato.i.bork.org>
By author: Martin Hicks <mort@wildopensource.com>
In newsgroup: linux.dev.kernel
>
> If I boot a 2.6 kernel that first execs /sbin/kinit on the initramfs,
> does some setup (mostly to find the real root filesystem), then
> pivot_roots over to the real root filesystem and execs /sbin/init the
> kernel spins inside check_mnt() while mounting /proc in the initscripts.
>
The initramfs is the "real root" -- you shouldn't pivot_root from it,
instead you should mount the new root on top of it.
This makes cleaning up a bit of an issue -- the proposed rootfs
mount_single patch takes care of that -- but it can also be done by
leaving a cleanup process with cwd inside the initramfs with would use
relative paths to clean up.
Something like this:
mount / /dev/real_root_whatever
( rm -rf . ) &
exec /sbin/init "$@"
-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
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"Unix gives you enough rope to shoot yourself in the foot."
Architectures needed: ia64 m68k mips64 ppc ppc64 s390 s390x sh v850 x86-64
prev parent reply other threads:[~2003-12-04 0:31 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-04 0:04 pivot_root off an initramfs broken Martin Hicks
2003-12-04 0:30 ` H. Peter Anvin [this message]
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