Messages in this thread | | | Date | Wed, 15 Sep 2004 04:41:20 +0100 | From | Nuno Silva <> | Subject | Re: procfs and chroot() ... ? |
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viro@parcelfarce.linux.theplanet.co.uk wrote: | On Tue, Sep 14, 2004 at 03:30:29AM +0200, Jochen Bern wrote: | |>I'm trying to chroot() a server that needs to read one readonly pseudo |>file from /proc . I tried to pinpoint my options to do so ... |> |>-- The alternative to accessing this one pseudo file would be to grant |> the server access to /dev/kmem ... NOT ... ANY ... BETTER!! 8-} |>-- Mounting two procfs instances (one normal, one inside the chroot()) |> and setting restrictive permissions on the latter makes identical |> changes to the former. (I assume that'ld be the same for ACLs?) |>-- Deploying SELinux ... will have to do a good deal of reading to |> even find out what'ld be involved in that ... |>-- Mounting a "second" procfs, chroot()ing into the exact subdir the |> file is in, and mounting non-procfs stuff (like the etc dir with the |> configs) *over* the sub-subdirs (ARGH!) would *happen* to rid me of |> all *writable* pseudo files, but still provide read access to way |> more info that I'ld want to provide to the server ... |>(- I'll try to Use The Source (tm) so that the server will not close the |> pseudo file, and does the chroot() itself after opening it, but let's |> assume for the sake of the argument that I won't succeed in that.) | | | Egads... | | mount --bind /proc/whatever/the/fsck/you/want \ | /home/jail/wherever/the/fsck/you/want/to/see/it | | (assuming that jail is in /home/jail and "mountpoint" exists).
Jochen, you can also --bind only one file. But you must create the file first:
# mkdir /var/jails/jail1/proc # touch /var/jails/jail1/proc/cpuinfo # mount --bind /proc/cpuinfo /var/jails/jail1/proc/cpuinfo
Regards, Nuno Silva -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org
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