Hi Tejun, On Wed, Sep 07, 2011 at 01:51 +0900, Tejun Heo wrote: > On Tue, Sep 06, 2011 at 02:15:18PM +0400, Vasiliy Kulikov wrote: > > c) If dentry is lazily dropped on each access attempt (or each illegal > > access) then PID2 can: > > > > i) read dentry line of /proc/slabinfo > > ii) call link(2) against /proc/PID/fd, which invalidates the > > specific dentry > > iii) re-read dentry line of /proc/slabinfo. If it has decreased by > > one, the dentry existed before (ii). > > If we really worry about this, probably the right thing to do is > hiding slabinfo from mortal UIDs instead of worrying about what > exactly are freed or not from each user. I agree with you. I don't think that showing system-global debug information to all users by default is the right thing. But some people doesn't agree with this point of view: http://thread.gmane.org/gmane.linux.kernel/1108378 -- Vasiliy Kulikov http://www.openwall.com - bringing security into open computing environments -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
