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Date: Mon, 23 Mar 2009 14:21:30 +0100 From: Miklos Szeredi <miklos@...redi.hu> To: serue@...ibm.com CC: bfields@...ldses.org, linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk, ebiederm@...ssion.com, linux-fsdevel@...r.kernel.org Subject: unprivileged mounts vs. rmdir (was: VFS, NFS security bug? ...) [CCs trimmed] On Mon, 16 Mar 2009, Serge E. Hallyn wrote: > Quoting J. Bruce Fields (bfields@...ldses.org): > > special privilege, so don't consult filesystem permissions (do I have > > that right? What happened to the attempt to allow ordinary users to > > mount?). > > Well, they keep getting stalled because we don't have a good answer for > what to do about the fact that an unprivileged user can make trees > undeletable by pinning them with mounts. (Miklos and Eric cc'd in case > I didn't explain that well enough). That's correct. The best answer I can come up with is to allow rmdir/unlink to automatically umount trees from their respective dentries. Obviously this can't be done for regular (privileged) mounts, which must keep returning EBUSY in such situations. But for unprivileged mounts I can't see any fundamental issue with such an approach. Does anyone see a problem with this? Is there a better solution? Thanks, Miklos -- 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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