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Date:      Wed, 15 Dec 2004 12:46:51 -0800
From:      Kris Kennaway <kris@obsecurity.org>
To:        security@revolutionsp.com
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: 5.x system trying to boot /kernel ?
Message-ID:  <20041215204651.GA83806@xor.obsecurity.org>
In-Reply-To: <63390.81.84.175.77.1103132379.squirrel@81.84.175.77>
References:  <63390.81.84.175.77.1103132379.squirrel@81.84.175.77>

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On Wed, Dec 15, 2004 at 11:39:39AM -0600, security@revolutionsp.com wrote:
> Hey,
>=20
> After adding KDB, KDB_UNATTENDED and DDB, two of my 5.3-STABLE servers
> never came back after a reboot. After talking to the datacenter, they
> informed me these servers are trying to boot of /kernel and not
> /boot/kernel/kernel ..
>=20
> What might be causing this behaviour ? /kernel was 4.X and these servers
> never knew what 4.X was.
>=20
> This only happened after adding KDB, KDB_UNATTENDED and DDB to the kernel
> config, I had recompiled the kernel before and it never tried to look
> /kernel instead of /boot/kernel/kernel
>=20
> # file /kernel
> /kernel: cannot open (/kernel)
> # file /boot/kernel/kernel
> /boot/kernel/kernel: ELF 32-bit LSB executable, Intel 80386, version 1
> (FreeBSD), dynamically linked (uses shared libs), not stripped

Old loader?  Local configuration of loader or boot blocks?

> I rebuilt a kernel on my FreeBSD home gateway (also 5.3-STABLE) and also
> adding GDB, I didn't have this problem.
>=20
> Is there any loader.conf variable which sets the kernel that should be
> booted ?

Yes, see the manpage.

Kris

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