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Date: Sat, 9 Jun 2007 10:04:19 -0700 (PDT) From: Davide Libenzi <davidel@...ilserver.org> To: Al Viro <viro@....linux.org.uk> cc: Ulrich Drepper <drepper@...hat.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Alan Cox <alan@...rguk.ukuu.org.uk>, Theodore Tso <tytso@....edu>, Eric Dumazet <dada1@...mosbay.com>, Kyle Moffett <mrmacman_g4@....com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, Ingo Molnar <mingo@...e.hu> Subject: Re: [patch 7/8] fdmap v2 - implement sys_socket2 On Sat, 9 Jun 2007, Al Viro wrote: > 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). That does not work. Or better, it works but it forces *huge* fdtables to be created. To do that, you need "start" to be over NR_FILE, and this creates an fdtable bigger than NR_FILE ((pointer-size + a-few-bits) * NR_FILE) propagated down to every app you fork. - Davide - 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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