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Date: Mon, 17 Dec 2007 18:39:55 -0600 From: "Serge E. Hallyn" <serue@...ibm.com> To: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp> Cc: "Serge E. Hallyn" <serue@...ibm.com>, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, Linux Containers <containers@...ts.osdl.org> Subject: Re: [patch 1/2] [RFC] Simple tamper-proof device filesystem. Quoting Tetsuo Handa (penguin-kernel@...ove.sakura.ne.jp): > Hello. > > Serge E. Hallyn wrote: > > CAP_MKNOD will be removed from its capability > I think it is not enough because the root can rename/unlink device files > (mv /dev/sda1 /dev/tmp; mv /dev/sda2 /dev/sda1; mv /dev/tmp /dev/sda2). Sure but that doesn't bother us :) The admin in the container has his own /dev directory and can do what he likes with the devices he's allowed to have. He just shouldn't have access to others. If he wants to rename /dev/sda1 to /dev/sda5 that's his choice. > > To use your approach, i guess we would have to use selinux (or tomoyo) > > to enforce that devices may only be created under /dev? > Everyone can use this filesystem alone. Sure but it is worthless alone. No? What will keep the container admin from doing 'mknod /root/hda1 b 3 1'? > But use with MAC (or whatever access control mechanisms that prevent > attackers from unmounting/overlaying this filesystem) is recomennded. -serge -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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