Re: [PATCH] vfs: fix race in rcu lookup of pruned dentry

From: Al Viro
Date: Mon Jul 18 2011 - 15:20:46 EST

On Mon, Jul 18, 2011 at 12:08:04PM -0700, Linus Torvalds wrote:

> But I do agree that it's very unlikely to actually cause problems.
> People just don't move mount points around, and the race would seem to
> be ridiculously hard to ever hit even if you tried to create some
> totally artificial load that does nothing but rename mount-points ;)

vfs_rename() will refuse to move mountpoints. Required by POSIX, among
other things...

> But I think I'm on the same page with Hugh that at this point none of
> these issues are even remotely recent, they are basically impossible
> to hit, and the fixes are likely potentially more dangerous than the
> bugs they fix, so I'll release 3.0 without them and just apply the
> fixes (and cc stable) afterwards.

Hmm... Could you pull #for-linus (or #for-linus2, for that matter - same
plus cifs_get_root() fix) first?
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