Date: Wed, 28 Dec 2005 01:16:04 -0800 (PST) From: Tzachi Tager <tzachi_tager@yahoo.com> To: Giorgos Keramidas <keramida@freebsd.org> Cc: freebsd-bugs@freebsd.org Subject: Re: using /dev/null in chrooted enviroment Message-ID: <20051228091604.48873.qmail@web30805.mail.mud.yahoo.com> In-Reply-To: <20051228032332.GA30303@flame.pc>
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Hi,
Giorgos Keramidas <keramida@freebsd.org> wrote: On 2005-12-27 06:49, Tzachi Tager wrote:
> Hi,
> I'm trying to create chrooted enviroment, i did the folllowing
> in the chrooted enviroment:
>
> mknode c null 0 24
> mknode c zero 0 25
>
> And then i did chroot and those files are under /dev, but when
> i wrote a short program in C that tries to open /dev/null
> (within the chrooted env.) i got:
>
> "/dev/null-operation is not supported"
> You forgot to mention what version of FreeBSD you are using. It
> may also help to see the contents of the chrooted /dev directory.
Sorry,
We are using:
FreeBSD freebsd6.0 6.0-RELEASE FreeBSD 6.0-RELEASE #0: Thu Nov 3 09:36:13 UTC 2005 root@x64.samsco.home:/usr/obj/usr/src/sys/GENERIC i386
We tried:
1) To create only /dev/null and /dev/zero (that configuration worked in FreeBSD 5.4)
2) To create the same /dev contents via: tar -cf - /dev | tar -xf -
The original system has /dev mounted as: devfs on /dev (devfs, local)
> Only by doing mount of devfs it seems to work fine, but i
> prefer not to do mount every time (because then i get that my
> chrooted enviroment pathname is too long for FreeBSD)
> A complete trace of the commands you are running and the exact
> error message is probably necessary here.
The very simple C program doesn't run in chroot:
int main() {
if (open ("/dev/null", O_WRONLY) == -1) {
perror ("open");
}
}
It issues: "open: Operation not supported".
PS: It seems like if we mount devfs to the chrooted env - everything works. The problem is that chroot directory can be placed everywhere, but mount doesn't accept very long path:
# mount -t devfs none dev
mount_devfs: File name too long
# pwd
/tmp/build.debugger-php-4.0.6.5269/debugger-php-4.0.6-DEBUG_SERVER_5_1_0_RC3_20051215
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