On Sat, Jun 09, 2007 at 09:26:34AM -0700, Ulrich Drepper wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Al Viro wrote: > > So which code is supposed to do that open/write in your example? Library? > > Unmodified application? Application specifically modified to make *that* > > open() randomized? > > Why should that matter? All of the above.
I asked for real-world example. Can I have one, please? > In whatever way you look at it, there currently is a problem which > cannot be solved except with truly horrible, horrible hack (open N > descriptors and randomly select one to use; yep, horrible, I said so). That's simply not true. On the current kernel nothing stops you from e.g. picking a random number and using F_DUPFD. Voila - there's your randomized descriptor. Portable to earlier kernels. Moreover, nonsense^H^H^Hq_fd() can be implemented in userland just fine if we allow F_DUPFD to arbitrary number - just pass it a random one *or* base chosen like davedel is doing (constant + 20bit random chosen at start time). - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
